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Discussion Groups | BasicX | Re: Need some help with Power MOSFET driver
Discussion forum for the BasicX family of microcontroller chips.
RE: Need some help with Power MOSFET driver - "James R. Parish" - Mar 11 11:43:12 2008
Charging a 260VDC battery.
From: b...@yahoogroups.com [mailto:b...@yahoogroups.com] On Behalf
Of Tom Becker
Sent: Tuesday, March 11, 2008 10:38 AM
To: b...@yahoogroups.com
Subject: Re: [BasicX] Need some help with Power MOSFET driver
> ... I'm running the MOSFET in its linear region...
To what load?
Tom
[Non-text portions of this message have been removed]
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From: b...@yahoogroups.com [mailto:b...@yahoogroups.com] On Behalf
Of Tom Becker
Sent: Tuesday, March 11, 2008 10:38 AM
To: b...@yahoogroups.com
Subject: Re: [BasicX] Need some help with Power MOSFET driver
> ... I'm running the MOSFET in its linear region...
To what load?
Tom
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: Need some help with Power MOSFET driver - Tom Becker - Mar 11 12:34:49 2008
> ... Charging a 260VDC battery.
Can you show us the high-voltage power supply and load circuit you're
using now?
In general, PWM is very easy since it is digital and the processor will
do most of the timing work for you, but high-voltage needs some
consideration. If you were charging a 6v battery it would be very easy.
Tom
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Can you show us the high-voltage power supply and load circuit you're
using now?
In general, PWM is very easy since it is digital and the processor will
do most of the timing work for you, but high-voltage needs some
consideration. If you were charging a 6v battery it would be very easy.
Tom
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: Need some help with Power MOSFET driver - rosa...@aol.com - Mar 11 14:14:10 2008
Hi,
I do not see any problem the transistor getting hot because the load is pulling out. By doing some calculation watts = V I and 260 volts * 1.25 amps is equal to 325 watts. 325 watts it will going to get hot. You may need to increase the heat sink area. Normally? once the battery is charged? the battery needs only a trickle charge so can lower the charging current. What type of heat sink you are using right now? You may need a bigger heat sink for the load the transistor is handling.
rosarite
-----Original Message-----
From: Tom Becker
To: b...@yahoogroups.com
Sent: Tue, 11 Mar 2008 10:25 am
Subject: Re: [BasicX] Need some help with Power MOSFET driver
> ... Charging a 260VDC battery.
Can you show us the high-voltage power supply and load circuit you're
using now?
In general, PWM is very easy since it is digital and the processor will
do most of the timing work for you, but high-voltage needs some
consideration. If you were charging a 6v battery it would be very easy.
Tom
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )