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19/03/2013

Problemas no disparo dos IGBTs

IGBT firing circuit, building my own 90hp AC drive
http://www.diyelectriccar.com/forums/showthread.php/igbt-firing-circuit-building-my-own-17319.html


Drives para IGBTs:

IPM: PM300CLA060

Sensores de efeito Hall:
http://www.lem.com/hq/en/content/view/13/86/



Aqui podemos ver as ligações feitas entre o IPM acima e os drives da placa de controle do inversor:





A tentativa de rodar o motor de 90Hp foi frustrada, apesar de ter conseguido rodar um motor de 3Hp e acionar o IGBT com a largura máxima do pulso PWM:

http://etischer.com/awdev/drive/video/igbt_turns_motor.wmv

Snubbers:
http://www.ebay.com/sch/sis.html?_nkw=5+Aerovox+RBPS+IGBT+Snubber+Capacitors+2+0UF+1000VDC+&_itemId=260271806765


You might not need 1000 volt rated, but wouldn't hurt. IGBT snubbers are low inductance film caps made to mount directly to single and dual modules. Not for that 6 pack. You can mount to your bus bar. Before specialized snubbers, they used film caps with very short leads. They clamp high frequency spikes.

The capacitors on the DC rail are to try and control the circuit under high speed switching, to prevent any inductance ringing. The MOV is there to clamp any spikes either from the caps not doing there job well enough (possibly due to layout) or from other sources. 
The DC rail contactor opening and closing can cause the inductance of the battery cable to ring and generate high voltage spikes.
Fit some bleed resistors on the capacitor bank....they store quite a bit of energy.
Fit three of the 2.2mfd's if you win them, will be a good starting point


6 400v 3,900uF





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