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Max t_on in an inverter using a bootstrap capacitor
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overgeo
electronics forum beginner


Joined: 13 Jul 2006
Posts: 12

PostPosted: Fri Jul 21, 2006 8:05 am    Post subject: Max t_on in an inverter using a bootstrap capacitor Reply with quote

Hi, I've done a circuit with the ir2113 for an inverter, and to drive
the high side device i use a bootstrap capacitor, and i'd like to know
how is the max t_on that the capacitor can hold on the high side. The
capacitor value is 10uF, and i'm using an igbt(irg4pc50fd), and another
thing how can i calculate the time that needs the capacitor to store
the charge necessary to turn on the high side IGBT?. Thanks in advance
Smile.
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Graham Holloway
electronics forum beginner


Joined: 10 May 2005
Posts: 18

PostPosted: Fri Jul 21, 2006 9:04 am    Post subject: Re: Max t_on in an inverter using a bootstrap capacitor Reply with quote

"overgeo" <overgeo@gmail.com> wrote in message
news:1153469105.788338.136570@p79g2000cwp.googlegroups.com...
Quote:
Hi, I've done a circuit with the ir2113 for an inverter, and to drive
the high side device i use a bootstrap capacitor, and i'd like to know
how is the max t_on that the capacitor can hold on the high side. The
capacitor value is 10uF, and i'm using an igbt(irg4pc50fd), and another
thing how can i calculate the time that needs the capacitor to store
the charge necessary to turn on the high side IGBT?. Thanks in advance
Smile.


Check out IR application note an 978

Graham H
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overgeo
electronics forum beginner


Joined: 13 Jul 2006
Posts: 12

PostPosted: Fri Jul 21, 2006 9:24 am    Post subject: Re: Max t_on in an inverter using a bootstrap capacitor Reply with quote

Graham Holloway ha escrito:

Quote:
"overgeo" <overgeo@gmail.com> wrote in message
news:1153469105.788338.136570@p79g2000cwp.googlegroups.com...
Hi, I've done a circuit with the ir2113 for an inverter, and to drive
the high side device i use a bootstrap capacitor, and i'd like to know
how is the max t_on that the capacitor can hold on the high side. The
capacitor value is 10uF, and i'm using an igbt(irg4pc50fd), and another
thing how can i calculate the time that needs the capacitor to store
the charge necessary to turn on the high side IGBT?. Thanks in advance
Smile.


Check out IR application note an 978

Graham H

HI, thanks for your fast response i had already check out, but i
haven't seen anything about max t_on with the cap, and i have seen in
the dt-98-s (bbotstrap component selection for control Ic's) that says
"the on time of the low side switch must be sufficient to ensure that
the charge drawn from the cbs capacitor by the high side driver can
fully replanished", but doesn't say how to calculate the minimum on
time, in my circuit i got a minimum time of 0.5ms or 1ms, will be
enoguh for a 10uF and 400v capacitor?
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