trigger IGBT
trigger IGBT
(OP)
Hi,
I'd like to know how a IGBT works with a pulse generated by a pulse amplitude modulator (PAM). For me the amplitude of the pulse sent to the gate of igbt serves only to trigger it. I don't know how varying the amplitude can make any difference in the output waveform.
I'd like to know how a IGBT works with a pulse generated by a pulse amplitude modulator (PAM). For me the amplitude of the pulse sent to the gate of igbt serves only to trigger it. I don't know how varying the amplitude can make any difference in the output waveform.





RE: trigger IGBT
The PAM technique is obsolete and was used when the thyristors/GTOs weren't fast enough to modulate the motor voltage. Instead, the supplying DC voltage was modulated by some device - sometimes a simple SCR rectifier and sometimes with a crude transistor device while "blocks" of that voltage was switched onto the motor windings. Rather terrible performance with bad cogging/vibrations and extra heat and all that.
The IGBT isn't "triggered" like a thyristor, the IGBT is switched on or off with the gate voltage.
I think yo should tell us what kind of equipment you are referring to. Is it a drive or a battery charger or an electrolythic plant or something else?
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: trigger IGBT
RE: trigger IGBT
The connected motor winding works as a low pass filter so that the current through the windings is sine shaped although the voltage is composed of square pulses. You may need to think twice about that. But that is how it is.
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: trigger IGBT