What should be the deadtime for Hbridge circuit??? - Page 2 - diyAudio
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Old 4th December 2012, 04:13 PM   #11
MarianB is offline MarianB  Romania
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That is a full bridge config, and as i see in the title of the topik you stated that there is a half bridge one, if that is the correct schematic than you maybe have miss stated the config.

In full bridge config the power switches have to cope with all the mains rectified mains voltage, that is 310Vcc in this case, that cannot be a problem for IRFP460 cus they have a 500 voltage rating, but the Ciss i think is the reason for theyr failing, IRFP460 has a Ciss of 4,2n, IR2110 has an output current of maximum 2A, now when charging a cap it first acts like a small shortcircuit so the 10 Ohm resistor limmits that current at something like 1,2A fir 12V Vin for the driver, that could be the reason for theyr failing.

What i think you could do is set the max duty cicle and with a osc visualise the gates of the fets first at that lower voltage and make sure turn on is fast and the wave looks ok than go at the higher voltage to see if things change.
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Old 4th December 2012, 04:28 PM   #12
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mur1560 are working fine....i have blown (12) IRFP460 and (4) IRFPG50 uptil now
 
Old 4th December 2012, 05:04 PM   #13
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by billu8660 View Post
mur1560 are working fine....i have blown (12) IRFP460 and (4) IRFPG50 uptil now
Which is probably as good a time as any to close the thread.

Non isolated supplies are potentially lethal and are against the forum rules (read notes, section 2)

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Although the control electronics are fed via a transformer the FET's are not and so there is a direct path back to the unisolated mains. All the primary side is "live".
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