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Dear All,
I have created 3 PWM sine wave outputs on LPC2136. Any idea how to create 3
more complimentary output with dead time insertion from driving a 3 phase
MOSFET bridge?
Warm Regards,

Mukund Deshmukh,
Beta Computronics Pvt Ltd.
10/1 IT Park, Parsodi,
Nagpur -440022 India.
Web site - http://betacomp.com

Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.

------------------------------------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

hello Mukund Deshmukh,
I understand you have only 1 PWM module. that means 6 single edge or 3 double edge. If you are using single edge then complimentry wouldnt be a problem. If you use double edge then u'll 've to use the other timers using its match register to generate the complimentry.. to care of dead time the best way i feel you 've to use IR driver IC which has a feature tht 'll take care of the deadtime.

Raj

----- Original Message ----
From: Mukund Deshmukh
To: l...@yahoogroups.com
Sent: Tuesday, July 29, 2008 10:59:59 AM
Subject: [lpc2000] Dead time insertion - LPC213XX PWM
Dear All,
I have created 3 PWM sine wave outputs on LPC2136. Any idea how to create 3
more complimentary output with dead time insertion from driving a 3 phase
MOSFET bridge?

Warm Regards,

Mukund Deshmukh,
Beta Computronics Pvt Ltd.
10/1 IT Park, Parsodi,
Nagpur -440022 India.
Web site - http://betacomp. com

Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.

[Non-text portions of this message have been removed]
------------------------------------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

Actually we are using IR2133, but the dead time is only 450nS, and we need
around 2 microsec.
The complementary pair is obtained by using a inverter gate.
Warm Regards,

Mukund Deshmukh,
Beta Computronics Pvt Ltd.
10/1 IT Park, Parsodi,
Nagpur -440022 India.
Web site - http://betacomp.com

Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.

----- Original Message -----
From: "Cool Dude"
To:
Sent: Tuesday, July 29, 2008 1:20 AM
Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
> hello Mukund Deshmukh,
> I understand you have only 1 PWM module. that means 6 single edge or 3
> double edge. If you are using single edge then complimentry wouldnt be a
> problem. If you use double edge then u'll 've to use the other timers
> using its match register to generate the complimentry.. to care of dead
> time the best way i feel you 've to use IR driver IC which has a feature
> tht 'll take care of the deadtime.
> Raj
>
> ----- Original Message ----
> From: Mukund Deshmukh
> To: l...@yahoogroups.com
> Sent: Tuesday, July 29, 2008 10:59:59 AM
> Subject: [lpc2000] Dead time insertion - LPC213XX PWM
> Dear All,
> I have created 3 PWM sine wave outputs on LPC2136. Any idea how to create
> 3
> more complimentary output with dead time insertion from driving a 3 phase
> MOSFET bridge?
>
> Warm Regards,
>
> Mukund Deshmukh,
> Beta Computronics Pvt Ltd.
> 10/1 IT Park, Parsodi,
> Nagpur -440022 India.
> Web site - http://betacomp. com
>
> Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.
> [Non-text portions of this message have been removed]
> ------------------------------------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

Using complimentary is also another option.
I've a doubt... is 450ns not sufficient..... is 2 microsecond specified by the manufacturers of IGBT you are using

Raj

----- Original Message ----
From: Mukund Deshmukh
To: l...@yahoogroups.com
Sent: Tuesday, July 29, 2008 2:09:24 PM
Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
Actually we are using IR2133, but the dead time is only 450nS, and we need
around 2 microsec.
The complementary pair is obtained by using a inverter gate.

Warm Regards,

Mukund Deshmukh,
Beta Computronics Pvt Ltd.
10/1 IT Park, Parsodi,
Nagpur -440022 India.
Web site - http://betacomp. com

Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.

----- Original Message -----
From: "Cool Dude"
To:
Sent: Tuesday, July 29, 2008 1:20 AM
Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM

> hello Mukund Deshmukh,
> I understand you have only 1 PWM module. that means 6 single edge or 3
> double edge. If you are using single edge then complimentry wouldnt be a
> problem. If you use double edge then u'll 've to use the other timers
> using its match register to generate the complimentry. . to care of dead
> time the best way i feel you 've to use IR driver IC which has a feature
> tht 'll take care of the deadtime.
> Raj
>
> ----- Original Message ----
> From: Mukund Deshmukh
> To: lpc2000@yahoogroups .com
> Sent: Tuesday, July 29, 2008 10:59:59 AM
> Subject: [lpc2000] Dead time insertion - LPC213XX PWM
> Dear All,
> I have created 3 PWM sine wave outputs on LPC2136. Any idea how to create
> 3
> more complimentary output with dead time insertion from driving a 3 phase
> MOSFET bridge?
>
> Warm Regards,
>
> Mukund Deshmukh,
> Beta Computronics Pvt Ltd.
> 10/1 IT Park, Parsodi,
> Nagpur -440022 India.
> Web site - http://betacomp. com
>
> Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.
> [Non-text portions of this message have been removed]
> ------------ --------- --------- ------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

We are using 600 volts MOSFET, with 100 ohm series resistance in base to for
lesser di/dt.
Warm Regards,

Mukund Deshmukh,
Beta Computronics Pvt Ltd.
10/1 IT Park, Parsodi,
Nagpur -440022 India.
Web site - http://betacomp.com

Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.

----- Original Message -----
From: "Cool Dude"
To:
Sent: Tuesday, July 29, 2008 1:47 AM
Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
> Using complimentary is also another option.
> I've a doubt... is 450ns not sufficient..... is 2 microsecond specified by
> the manufacturers of IGBT you are using
> Raj
>
> ----- Original Message ----
> From: Mukund Deshmukh
> To: l...@yahoogroups.com
> Sent: Tuesday, July 29, 2008 2:09:24 PM
> Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
> Actually we are using IR2133, but the dead time is only 450nS, and we need
> around 2 microsec.
> The complementary pair is obtained by using a inverter gate.
>
> Warm Regards,
>
> Mukund Deshmukh,
> Beta Computronics Pvt Ltd.
> 10/1 IT Park, Parsodi,
> Nagpur -440022 India.
> Web site - http://betacomp. com
>
> Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.
>
> ----- Original Message -----
> From: "Cool Dude"
> To:
> Sent: Tuesday, July 29, 2008 1:20 AM
> Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
>
>> hello Mukund Deshmukh,
>> I understand you have only 1 PWM module. that means 6 single edge or 3
>> double edge. If you are using single edge then complimentry wouldnt be a
>> problem. If you use double edge then u'll 've to use the other timers
>> using its match register to generate the complimentry. . to care of dead
>> time the best way i feel you 've to use IR driver IC which has a feature
>> tht 'll take care of the deadtime.
>> Raj
>>
>> ----- Original Message ----
>> From: Mukund Deshmukh
>> To: lpc2000@yahoogroups .com
>> Sent: Tuesday, July 29, 2008 10:59:59 AM
>> Subject: [lpc2000] Dead time insertion - LPC213XX PWM
>> Dear All,
>> I have created 3 PWM sine wave outputs on LPC2136. Any idea how to create
>> 3
>> more complimentary output with dead time insertion from driving a 3
>> phase
>> MOSFET bridge?
>>
>> Warm Regards,
>>
>> Mukund Deshmukh,
>> Beta Computronics Pvt Ltd.
>> 10/1 IT Park, Parsodi,
>> Nagpur -440022 India.
>> Web site - http://betacomp. com
>>
>> Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.
>> [Non-text portions of this message have been removed]
>> ------------ --------- --------- ------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

Mosfet Part??
have you used Diode for ripples stabilization
On 7/29/08, Mukund Deshmukh wrote:
>
> We are using 600 volts MOSFET, with 100 ohm series resistance in base to
> for
> lesser di/dt.
>
> Warm Regards,
>
> Mukund Deshmukh,
> Beta Computronics Pvt Ltd.
> 10/1 IT Park, Parsodi,
> Nagpur -440022 India.
> Web site - http://betacomp.com
>
> Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.
>
> ----- Original Message -----
> From: "Cool Dude" >
> To: >
> Sent: Tuesday, July 29, 2008 1:47 AM
> Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
>
> > Using complimentary is also another option.
> > I've a doubt... is 450ns not sufficient..... is 2 microsecond specified
> by
> > the manufacturers of IGBT you are using
> >
> >
> > Raj
> >
> >
> >
> > ----- Original Message ----
> > From: Mukund Deshmukh
> >
> > To: l...@yahoogroups.com
> > Sent: Tuesday, July 29, 2008 2:09:24 PM
> > Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
> >
> >
> > Actually we are using IR2133, but the dead time is only 450nS, and we
> need
> > around 2 microsec.
> > The complementary pair is obtained by using a inverter gate.
> >
> > Warm Regards,
> >
> > Mukund Deshmukh,
> > Beta Computronics Pvt Ltd.
> > 10/1 IT Park, Parsodi,
> > Nagpur -440022 India.
> > Web site - http://betacomp. com
> >
> > Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.
> >
> > ----- Original Message -----
> > From: "Cool Dude"
> > To:
> > Sent: Tuesday, July 29, 2008 1:20 AM
> > Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
> >
> >> hello Mukund Deshmukh,
> >> I understand you have only 1 PWM module. that means 6 single edge or 3
> >> double edge. If you are using single edge then complimentry wouldnt be a
> >> problem. If you use double edge then u'll 've to use the other timers
> >> using its match register to generate the complimentry. . to care of dead
> >> time the best way i feel you 've to use IR driver IC which has a feature
> >> tht 'll take care of the deadtime.
> >>
> >>
> >> Raj
> >>
> >>
> >>
> >> ----- Original Message ----
> >> From: Mukund Deshmukh
> >> To: lpc2000@yahoogroups .com
> >> Sent: Tuesday, July 29, 2008 10:59:59 AM
> >> Subject: [lpc2000] Dead time insertion - LPC213XX PWM
> >>
> >>
> >> Dear All,
> >> I have created 3 PWM sine wave outputs on LPC2136. Any idea how to
> create
> >> 3
> >> more complimentary output with dead time insertion from driving a 3
> >> phase
> >> MOSFET bridge?
> >>
> >> Warm Regards,
> >>
> >> Mukund Deshmukh,
> >> Beta Computronics Pvt Ltd.
> >> 10/1 IT Park, Parsodi,
> >> Nagpur -440022 India.
> >> Web site - http://betacomp. com
> >>
> >> Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.
> >>
> >>
> >>
> >>
> >>
> >>
> >> [Non-text portions of this message have been removed]
> >>
> >>
> >> ------------ --------- --------- ------
> >>
> >>



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

from this spec how did u decided you 've to have 2 microsecond

Raj

----- Original Message ----
From: Mukund Deshmukh
To: l...@yahoogroups.com
Sent: Tuesday, July 29, 2008 2:50:08 PM
Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
We are using 600 volts MOSFET, with 100 ohm series resistance in base to for
lesser di/dt.

Warm Regards,

Mukund Deshmukh,
Beta Computronics Pvt Ltd.
10/1 IT Park, Parsodi,
Nagpur -440022 India.
Web site - http://betacomp. com

Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.

----- Original Message -----
From: "Cool Dude"
To:
Sent: Tuesday, July 29, 2008 1:47 AM
Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM

> Using complimentary is also another option.
> I've a doubt... is 450ns not sufficient.. ... is 2 microsecond specified by
> the manufacturers of IGBT you are using
> Raj
>
> ----- Original Message ----
> From: Mukund Deshmukh
> To: lpc2000@yahoogroups .com
> Sent: Tuesday, July 29, 2008 2:09:24 PM
> Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
> Actually we are using IR2133, but the dead time is only 450nS, and we need
> around 2 microsec.
> The complementary pair is obtained by using a inverter gate.
>
> Warm Regards,
>
> Mukund Deshmukh,
> Beta Computronics Pvt Ltd.
> 10/1 IT Park, Parsodi,
> Nagpur -440022 India.
> Web site - http://betacomp. com
>
> Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.
>
> ----- Original Message -----
> From: "Cool Dude"
> To:
> Sent: Tuesday, July 29, 2008 1:20 AM
> Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
>
>> hello Mukund Deshmukh,
>> I understand you have only 1 PWM module. that means 6 single edge or 3
>> double edge. If you are using single edge then complimentry wouldnt be a
>> problem. If you use double edge then u'll 've to use the other timers
>> using its match register to generate the complimentry. . to care of dead
>> time the best way i feel you 've to use IR driver IC which has a feature
>> tht 'll take care of the deadtime.
>> Raj
>>
>> ----- Original Message ----
>> From: Mukund Deshmukh
>> To: lpc2000@yahoogroups .com
>> Sent: Tuesday, July 29, 2008 10:59:59 AM
>> Subject: [lpc2000] Dead time insertion - LPC213XX PWM
>> Dear All,
>> I have created 3 PWM sine wave outputs on LPC2136. Any idea how to create
>> 3
>> more complimentary output with dead time insertion from driving a 3
>> phase
>> MOSFET bridge?
>>
>> Warm Regards,
>>
>> Mukund Deshmukh,
>> Beta Computronics Pvt Ltd.
>> 10/1 IT Park, Parsodi,
>> Nagpur -440022 India.
>> Web site - http://betacomp. com
>>
>> Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.
>> [Non-text portions of this message have been removed]
>> ------------ --------- --------- ------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

Cool Dude Wrote
>Using complimentary is also another option.
> I've a doubt... is 450ns not sufficient..... is 2 microsecond specified
by the >manufacturers of IGBT you are using

Working with EV motor controllers, the transitions are often slowed done to
something on the order of 1 uS for EMI considerations so I have no trouble
believing the two microsecond deadtime.

The 'usual' way this is achieved is via an RC sandwiched between a pair of
Schmidt trigger inverters and some discrete logic to blank the leading
edges. Some PWM generators (not many) provide sufficient support for doing
this in SW. I remember the 80c196 AC chips could.=20=20

Robert

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------------------------------------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

>Working with EV motor controllers, the transitions are often slowed done to
>something on the order of 1 uS for EMI considerations so I have no trouble
>believing the two microsecond deadtime.

>The 'usual' way this is achieved is via an RC sandwiched between a pair of
>Schmidt trigger inverters and some discrete logic to blank the leading
>edges. Some PWM generators (not many) provide sufficient support for doing
>this in SW. I remember the 80c196 AC chips could.

I did exactly same, but problem is high side pulse has become longer by 4
micro second compared to low side. generating voltage unbalance. The pwm
period is just 128 micro second. Do you have any discrete circuit to achieve
this or any link?

As regard 80C196, it is no longer available from Intel, Are there any other
manufacturer?

Motorola MC68HC908 has PWM with dead time insertion, but its 8 bit only, and
I don't want to shift at this stage.

Warm Regards,

Mukund Deshmukh,
Beta Computronics Pvt Ltd.
10/1 IT Park, Parsodi,
Nagpur -440022 India.
Web site - http://betacomp.com

Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.

------------------------------------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

On Tue, Jul 29, 2008 at 11:39 PM, s...@aeolusdevelopment.com
wrote:
> The 'usual' way this is achieved is via an RC sandwiched between a pair of
> Schmidt trigger inverters and some discrete logic to blank the leading
> edges.

Yes. I like hardware solution in this regard, simple and effective.

> Some PWM generators (not many) provide sufficient support for doing
> this in SW. I remember the 80c196 AC chips could.
>

80C196 is dead. Maybe the OP can take a look at TI TMS470 ARM7.
They have the HET (High End Timer) built-in, kind of PWM Co-processor.
Freescale has something similar too.

Xiaofan

------------------------------------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

>> The 'usual' way this is achieved is via an RC sandwiched between a pair
>> of
>> Schmidt trigger inverters and some discrete logic to blank the leading
>> edges.
>
> Yes. I like hardware solution in this regard, simple and effective.
>

Can you give some idea, how dead time can be achieved?
Warm Regards,

Mukund Deshmukh,
Beta Computronics Pvt Ltd.
10/1 IT Park, Parsodi,
Nagpur -440022 India.
Web site - http://betacomp.com

Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.

------------------------------------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

On Wed, Jul 30, 2008 at 1:48 PM, Mukund Deshmukh
wrote:
>>> The 'usual' way this is achieved is via an RC sandwiched between a pair
>>> of Schmidt trigger inverters and some discrete logic to blank the leading
>>> edges.
>>
>> Yes. I like hardware solution in this regard, simple and effective.
>> Can you give some idea, how dead time can be achieved?

Example PWM dead time generator:
http://users.tkk.fi/~jwagner/electr/pwm-deadtime-gen/

Xiaofan
http://mcuee.blogspot.com

------------------------------------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

Mukund Deshmukh Wrote
>>Working with EV motor controllers, the transitions are often slowed done
to
>>something on the order of 1 uS for EMI considerations so I have no trouble
>>believing the two microsecond deadtime.
>
>>The 'usual' way this is achieved is via an RC sandwiched between a pair of
>>Schmidt trigger inverters and some discrete logic to blank the leading
>>edges. Some PWM generators (not many) provide sufficient support for
doing
>>this in SW. I remember the 80c196 AC chips could.
>
>I did exactly same, but problem is high side pulse has become longer by 4
>micro second compared to low side. generating voltage unbalance. The pwm
>period is just 128 micro second. Do you have any discrete circuit to
achieve
>this or any link?

Come now, you can do this. What happens when you and the delayed and
non-delayed signals? :) Also remember leading blank on both sides is the
same as leading and trailing blanking on just one (and it leaves the signal
balanced. You do still have to watch for runt pulses of course.

>As regard 80C196, it is no longer available from Intel, Are there any
other
>manufacturer?

Afraid not, the 196 was sole sourced (I think IBM and AT&T had licenses and
I had even seen mention of IBM producing a variant but I was never able to
find a commercial source). I do know there are at least some designs still
being produced with 196's but they are using old stock.

Robert
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(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

Xiaofan Chen Wrote
>On Wed, Jul 30, 2008 at 1:48 PM, Mukund Deshmukh
> wrote:
>>>> The 'usual' way this is achieved is via an RC sandwiched between a pai=
r
>>>> of Schmidt trigger inverters and some discrete logic to blank the
leading
>>>> edges.
>>>
>>> Yes. I like hardware solution in this regard, simple and effective.
>>> Can you give some idea, how dead time can be achieved?
>
>Example PWM dead time generator:
>http://users.tkk.fi/~jwagner/electr/pwm-deadtime-gen/

Not quite, follow the logic you don't end up with a pwm with dead time
inserted but rather pulses that mark the beginning and end of the duty
cycle. There's also a problem with the repeatability of that circuit.=20
Having to rely on capacitors for timing is bad enough but it's compounded
here by relying on unspecified triggering characteristics. There is a
reason I specified Schmidt trigger characteristics. There is also a reason
I suggested a pair of inverters rather than a single gate.

Robert

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(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

Robert Wrote
>Come now, you can do this. What happens when you and the delayed and
>non-delayed signals? :)=20

probably easier to read if I emphasize the and.

"What happens when you AND the delayed and
non-delayed signals?"

Robert
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(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

Mukund Deshmukh
> wrote:
>>>> The 'usual' way this is achieved is via an RC sandwiched between a pair
>>>> of Schmidt trigger inverters and some discrete logic to blank the
leading
>>>> edges.
>>>
>>> Yes. I like hardware solution in this regard, simple and effective.
>>> Can you give some idea, how dead time can be achieved?
>
>Example PWM dead time generator:
>http://users.tkk.fi/~jwagner/electr/pwm-deadtime-gen/

Finally achieved the dead time insertion with 3 Schmitt trigger Dual Input
NAND gate (per phase).
The rising and falling edges were delayed and AND ed with input signal.
Any other option...
Warm Regards,

Mukund Deshmukh,
Beta Computronics Pvt Ltd.
10/1 IT Park, Parsodi,
Nagpur -440022 India.
Web site - http://betacomp.com

Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.

------------------------------------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

hi Robert, Xiaofan Chen, Mukund Deshmukh,

Can we not generate the deadtime correctly by adjusting the duty cycle appr=
opriatley

=20
Raj

----- Original Message ----
From: "s...@aeolusdevelopment.com" t.com>
To: l...@yahoogroups.com
Sent: Wednesday, July 30, 2008 7:25:34 PM
Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
Robert Wrote
>Come now, you can do this. What happens when you and the delayed and
>non-delayed signals? :)=20

probably easier to read if I emphasize the and.

"What happens when you AND the delayed and
non-delayed signals?"

Robert

------------ --------- --------- --------- --------- --------- -
mail2web.com =96 What can On Demand Business Solutions do for you?
http://link. mail2web. com/Business/ SharePoint

=20=20=20=20
=20=20=20=20=20=20

[Non-text portions of this message have been removed]
------------------------------------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

You need 6 PWM output with 12 match registers, LPC has only 6 match
registers to control 3 PWM output.
BTW, How about LPC2103, can it generate 6 PWM with double edge control?
Any one tried this?
Warm Regards,

Mukund Deshmukh,
Beta Computronics Pvt Ltd.
10/1 IT Park, Parsodi,
Nagpur -440022 India.
Web site - http://betacomp.com

Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.

----- Original Message -----
From: "Cool Dude"
To:
Sent: Wednesday, July 30, 2008 9:24 PM
Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
hi Robert, Xiaofan Chen, Mukund Deshmukh,

Can we not generate the deadtime correctly by adjusting the duty cycle
appropriatley
Raj

----- Original Message ----
From: "s...@aeolusdevelopment.com"

To: l...@yahoogroups.com
Sent: Wednesday, July 30, 2008 7:25:34 PM
Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
Robert Wrote
>Come now, you can do this. What happens when you and the delayed and
>non-delayed signals? :)

probably easier to read if I emphasize the and.

"What happens when you AND the delayed and
non-delayed signals?"

Robert

------------ --------- --------- --------- --------- --------- -
mail2web.com - What can On Demand Business Solutions do for you?
http://link. mail2web. com/Business/ SharePoint

[Non-text portions of this message have been removed]
------------------------------------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

Dear Mukund Deshmukh,

I 'm using LPC2468 which can produce 6 doubled edged PWM's.

Raj

----- Original Message ----
From: Mukund Deshmukh
To: l...@yahoogroups.com
Sent: Thursday, July 31, 2008 10:26:20 AM
Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
You need 6 PWM output with 12 match registers, LPC has only 6 match
registers to control 3 PWM output.
BTW, How about LPC2103, can it generate 6 PWM with double edge control?
Any one tried this?

Warm Regards,

Mukund Deshmukh,
Beta Computronics Pvt Ltd.
10/1 IT Park, Parsodi,
Nagpur -440022 India.
Web site - http://betacomp. com

Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.

----- Original Message -----
From: "Cool Dude"
To:
Sent: Wednesday, July 30, 2008 9:24 PM
Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM

hi Robert, Xiaofan Chen, Mukund Deshmukh,

Can we not generate the deadtime correctly by adjusting the duty cycle
appropriatley

Raj

----- Original Message ----
From: "subscriptions@ aeolusdevelopmen t.com"

To: lpc2000@yahoogroups .com
Sent: Wednesday, July 30, 2008 7:25:34 PM
Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM

Robert Wrote
>Come now, you can do this. What happens when you and the delayed and
>non-delayed signals? :)

probably easier to read if I emphasize the and.

"What happens when you AND the delayed and
non-delayed signals?"

Robert

------------ --------- --------- --------- --------- --------- -
mail2web.com - What can On Demand Business Solutions do for you?
http://link. mail2web. com/Business/ SharePoint

[Non-text portions of this message have been removed]

------------ --------- --------- ------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

At 09:17 PM 7/30/2008 -0700, Mukund Deshmukh wrote:
>Mukund Deshmukh
> > wrote:
> >>>> The 'usual' way this is achieved is via an RC sandwiched between a pair
> >>>> of Schmidt trigger inverters and some discrete logic to blank the
>leading
> >>>> edges.
> >>>
> >>> Yes. I like hardware solution in this regard, simple and effective.
> >>>
> >>
> >> Can you give some idea, how dead time can be achieved?
> >
> >Example PWM dead time generator:
> >http://users.tkk.fi/~jwagner/electr/pwm-deadtime-gen/
>
>Finally achieved the dead time insertion with 3 Schmitt trigger Dual Input
>NAND gate (per phase).
>The rising and falling edges were delayed and AND ed with input signal.
>Any other option...

Just delay and blank the leading edges two Schmidt trigger invertors, an
AND and a NOR gives you both signals. And yes doing that will give you a
deadband on both edges.

a 74xx02, a 74xx08, and a 74xx14. Three chips, three phases. All
standard logic chips available from multiple vendors and inexpensive.

Are Schmitt trigger inputs NANDs available standard? Or just single vendor?

Robert

Another sign of the end of civilization, our technical magazines are
getting chatty
From an EETimes product descriptions 2006/08/09
".... systems that can sample gobs of inputs simultaneously"
Now just what is the technical definition for gobs again?
http://www.aeolusdevelopment.com/
------------------------------------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

> Just delay and blank the leading edges two Schmidt trigger invertors, an
> AND and a NOR gives you both signals. And yes doing that will give you a
> deadband on both edges.
>
> a 74xx02, a 74xx08, and a 74xx14. Three chips, three phases. All
> standard logic chips available from multiple vendors and inexpensive.
>
> Are Schmitt trigger inputs NANDs available standard? Or just single
> vendor?

74XX132

Warm Regards,

Mukund Deshmukh,
Beta Computronics Pvt Ltd.
10/1 IT Park, Parsodi,
Nagpur -440022 India.
Web site - http://betacomp.com

Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.

------------------------------------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

For my project V/F drive can u suggest me an appropriate pdf....

Raj

----- Original Message ----
From: Robert Adsett
To: l...@yahoogroups.com; l...@yahoogroups.com
Sent: Friday, August 1, 2008 5:30:51 AM
Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
At 09:24 PM 7/30/2008 -0700, Cool Dude wrote:
>hi Robert, Xiaofan Chen, Mukund Deshmukh,
>
>Can we not generate the deadtime correctly by adjusting the duty cycle
>appropriatley

In a word no, you need to specify the timing on both rise and fall of both
signals not just adjust the duty cycle. Some PWM generators support this
with separate dead time logic, with full on/off position control you can
also achieve that. The LPC21XX can do that but at the expense of only
getting half the PWMs since that mode needs double the match registers.

Robert

http://www.aeolusde velopment. com/

>From the Divided by a Common Language File (Edited to protect the guilty)
ME - "I'd like to get Price and delivery for connector Part # XXXXX"
Dist./Rep - "$X.XX Lead time 37 days"
ME - "Anything we can do about lead time? 37 days seems a bit high."
Dist./Rep - "that is the lead time given because our stock is live.... we
currently have stock."

[Non-text portions of this message have been removed]
------------------------------------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

At 09:15 PM 7/31/2008 -0700, Mukund Deshmukh wrote:
> > Just delay and blank the leading edges two Schmidt trigger invertors, an
> > AND and a NOR gives you both signals. And yes doing that will give you a
> > deadband on both edges.
> >
> > a 74xx02, a 74xx08, and a 74xx14. Three chips, three phases. All
> > standard logic chips available from multiple vendors and inexpensive.
> >
> > Are Schmitt trigger inputs NANDs available standard? Or just single
> > vendor?
>
>74XX132
Thanks, I'll try to keep that in mind.

Robert

http://www.aeolusdevelopment.com/

From the Divided by a Common Language File (Edited to protect the guilty)
ME - "I'd like to get Price and delivery for connector Part # XXXXX"
Dist./Rep - "$X.XX Lead time 37 days"
ME - "Anything we can do about lead time? 37 days seems a bit high."
Dist./Rep - "that is the lead time given because our stock is live.... we
currently have stock."
------------------------------------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

At 09:31 PM 7/31/2008 -0700, Cool Dude wrote:
>For my project V/F drive can u suggest me an appropriate pdf....
There are a number of application notes out there. TI's are the most
complete of those I've seen but I believe Microchip has a note or two and
Freescale and ST do as well IIRC

Robert

Another sign of the end of civilization, our technical magazines are
getting chatty
From an EETimes product descriptions 2006/08/09
".... systems that can sample gobs of inputs simultaneously"
Now just what is the technical definition for gobs again?
http://www.aeolusdevelopment.com/
------------------------------------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

i have gone through most of the pdf's... but i 've still got some doubts to be cleared.... i Hope you can help me out.. For generating the SVM algorithm.

1) Do we actually need the lookup table they 've mentioned for time "Tb".. i guess the angle in radians cud be put up as look up table.

2)Wat would be the value of Fpwm if we have to get a output freq of 50hz.

3)How do we actually maintain constant V/F....( we have to change the voltage with refernece to freq to maintain constant ratio)...

Raj

----- Original Message ----
From: Robert Adsett
To: l...@yahoogroups.com; l...@yahoogroups.com
Sent: Sunday, August 3, 2008 9:25:17 PM
Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
At 09:31 PM 7/31/2008 -0700, Cool Dude wrote:
>For my project V/F drive can u suggest me an appropriate pdf....

There are a number of application notes out there. TI's are the most
complete of those I've seen but I believe Microchip has a note or two and
Freescale and ST do as well IIRC

Robert

Another sign of the end of civilization, our technical magazines are
getting chatty
>From an EETimes product descriptions 2006/08/09
".... systems that can sample gobs of inputs simultaneously"
Now just what is the technical definition for gobs again?
http://www.aeolusde velopment. com/

[Non-text portions of this message have been removed]
------------------------------------



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

Mukund,
further you also see that layout makes very effect on the final things.
we have design many automotive products and energy meter all passes due to
only due cosideration
of layout.

if your system hangsout you may also use, cera diodes or TVS diode.

On 7/29/08, Mukund Deshmukh wrote:
>
> We are using 600 volts MOSFET, with 100 ohm series resistance in base t=
o
> for
> lesser di/dt.
>
> Warm Regards,
>
> Mukund Deshmukh,
> Beta Computronics Pvt Ltd.
> 10/1 IT Park, Parsodi,
> Nagpur -440022 India.
> Web site - http://betacomp.com
>
> Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.
>
> ----- Original Message -----
> From: "Cool Dude" >
> To: >
> Sent: Tuesday, July 29, 2008 1:47 AM
> Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
>
> > Using complimentary is also another option.
> > I've a doubt... is 450ns not sufficient..... is 2 microsecond specified
> by
> > the manufacturers of IGBT you are using
> >
> >
> > Raj
> >
> >
> >
> > ----- Original Message ----
> > From: Mukund Deshmukh l.com>
> >
> > To: l...@yahoogroups.com
> > Sent: Tuesday, July 29, 2008 2:09:24 PM
> > Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
> >
> >
> > Actually we are using IR2133, but the dead time is only 450nS, and we
> need
> > around 2 microsec.
> > The complementary pair is obtained by using a inverter gate.
> >
> > Warm Regards,
> >
> > Mukund Deshmukh,
> > Beta Computronics Pvt Ltd.
> > 10/1 IT Park, Parsodi,
> > Nagpur -440022 India.
> > Web site - http://betacomp. com
> >
> > Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.
> >
> > ----- Original Message -----
> > From: "Cool Dude"
> > To:
> > Sent: Tuesday, July 29, 2008 1:20 AM
> > Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
> >
> >> hello Mukund Deshmukh,
> >> I understand you have only 1 PWM module. that means 6 single edge or 3
> >> double edge. If you are using single edge then complimentry wouldnt be=
a
> >> problem. If you use double edge then u'll 've to use the other timers
> >> using its match register to generate the complimentry. . to care of de=
ad
> >> time the best way i feel you 've to use IR driver IC which has a featu=
re
> >> tht 'll take care of the deadtime.
> >>
> >>
> >> Raj
> >>
> >>
> >>
> >> ----- Original Message ----
> >> From: Mukund Deshmukh
> >> To: lpc2000@yahoogroups .com
> >> Sent: Tuesday, July 29, 2008 10:59:59 AM
> >> Subject: [lpc2000] Dead time insertion - LPC213XX PWM
> >>
> >>
> >> Dear All,
> >> I have created 3 PWM sine wave outputs on LPC2136. Any idea how to
> create
> >> 3
> >> more complimentary output with dead time insertion from driving a 3
> >> phase
> >> MOSFET bridge?
> >>
> >> Warm Regards,
> >>
> >> Mukund Deshmukh,
> >> Beta Computronics Pvt Ltd.
> >> 10/1 IT Park, Parsodi,
> >> Nagpur -440022 India.
> >> Web site - http://betacomp. com
> >>
> >> Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.
> >>
> >>
> >>
> >>
> >>
> >>
> >> [Non-text portions of this message have been removed]
> >>
> >>
> >> ------------ --------- --------- ------
> >>
> >>



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

Mukund,
further you also see that layout makes very effect on the final things.
we have design many automotive products and energy meter all passes due to
only due cosideration
of layout.

Yes, we learned it, we have redisgned the PCB. The layout was affecting the
thermal performance of MOSFET.

BTW, we have also shifted the project to PIC18F4431, it has an excellent PWM
with dead time, just for information.
Warm Regards,

Mukund Deshmukh,
Beta Computronics Pvt Ltd.
10/1 IT Park, Parsodi,
Nagpur -440022 India.
Web site - http://betacomp.com

Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.

On 7/29/08, Mukund Deshmukh wrote:
>
> We are using 600 volts MOSFET, with 100 ohm series resistance in base to
> for
> lesser di/dt.
>
> Warm Regards,
>
> Mukund Deshmukh,
> Beta Computronics Pvt Ltd.
> 10/1 IT Park, Parsodi,
> Nagpur -440022 India.
> Web site - http://betacomp.com
>
> Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.
>
> ----- Original Message -----
> From: "Cool Dude" >
> To: >
> Sent: Tuesday, July 29, 2008 1:47 AM
> Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
>
> > Using complimentary is also another option.
> > I've a doubt... is 450ns not sufficient..... is 2 microsecond specified
> by
> > the manufacturers of IGBT you are using
> >
> >
> > Raj
> >
> >
> >
> > ----- Original Message ----
> > From: Mukund Deshmukh
> >
> >
> > To: l...@yahoogroups.com
> > Sent: Tuesday, July 29, 2008 2:09:24 PM
> > Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
> >
> >
> > Actually we are using IR2133, but the dead time is only 450nS, and we
> need
> > around 2 microsec.
> > The complementary pair is obtained by using a inverter gate.
> >
> > Warm Regards,
> >
> > Mukund Deshmukh,
> > Beta Computronics Pvt Ltd.
> > 10/1 IT Park, Parsodi,
> > Nagpur -440022 India.
> > Web site - http://betacomp. com
> >
> > Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.
> >
> > ----- Original Message -----
> > From: "Cool Dude"
> > To:
> > Sent: Tuesday, July 29, 2008 1:20 AM
> > Subject: Re: [lpc2000] Dead time insertion - LPC213XX PWM
> >
> >> hello Mukund Deshmukh,
> >> I understand you have only 1 PWM module. that means 6 single edge or 3
> >> double edge. If you are using single edge then complimentry wouldnt be
> >> a
> >> problem. If you use double edge then u'll 've to use the other timers
> >> using its match register to generate the complimentry. . to care of
> >> dead
> >> time the best way i feel you 've to use IR driver IC which has a
> >> feature
> >> tht 'll take care of the deadtime.
> >>
> >>
> >> Raj
> >>
> >>
> >>
> >> ----- Original Message ----
> >> From: Mukund Deshmukh
> >> To: lpc2000@yahoogroups .com
> >> Sent: Tuesday, July 29, 2008 10:59:59 AM
> >> Subject: [lpc2000] Dead time insertion - LPC213XX PWM
> >>
> >>
> >> Dear All,
> >> I have created 3 PWM sine wave outputs on LPC2136. Any idea how to
> create
> >> 3
> >> more complimentary output with dead time insertion from driving a 3
> >> phase
> >> MOSFET bridge?
> >>
> >> Warm Regards,
> >>
> >> Mukund Deshmukh,
> >> Beta Computronics Pvt Ltd.
> >> 10/1 IT Park, Parsodi,
> >> Nagpur -440022 India.
> >> Web site - http://betacomp. com
> >>
> >> Meet us at Booth I102, Taipei PLAS 2008, Sept 18-22 , Taiwan.
> >>
> >>
> >>
> >>
> >>
> >>
> >> [Non-text portions of this message have been removed]
> >>
> >>
> >> ------------ --------- --------- ------
> >>
> >>



(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )