Hello,

I am trying to build a circuit with IGBT and RC circuit. In which i have a situation where the emitter of the IGBT is connected to the capacitor. When the capacitor voltage is charged to voltage level higher than the gate emitter voltage, the IGBT switches to off state. How can i solve this problem . I have attached the LTspice circuit for understanding .

Input voltage 200VDC

Regards and Thanks in advance

Sriniketh

 

Hello,

I am trying to build a circuit with IGBT and RC circuit. In which i have a situation where the emitter of the IGBT is connected to the capacitor. When the capacitor voltage is charged to voltage level higher than the gate emitter voltage, the IGBT switches to off state. How can i solve this problem . I have attached the LTspice circuit for understanding .

Input voltage 200VDC

Regards and Thanks in advance

Sriniketh

There are several ways:
Bootstrap driver
Charge pump driver
Isolated power suppy to name a few
Have a google to see which might be best for you or tell us more about the timing of your circuit.
PS. one post is enough. More will just make it confusing.

 

There are several ways:
Bootstrap driver
Charge pump driver
Isolated power suppy to name a few
Have a google to see which might be best for you or tell us more about the timing of your circuit.
PS. one post is enough. More will just make it confusing.

Thank you for the reply. I am new to this forum . i made the title wrong , didnt know to delete the thread , so made new one.

With respect to the timing , the time period for both the IGBTs are 1000µs and

T-on for the IGBT which is connected to capacitor is 999699ns
T-on for the second IGBT which is connected to ground through resistive load is 100ns

 

Thank you for the reply. I am new to this forum . i made the title wrong , didnt know to delete the thread , so made new one.

With respect to the timing , the time period for both the IGBTs are 1000µs and

T-on for the IGBT which is connected to capacitor is 999699ns
T-on for the second IGBT which is connected to ground through resistive load is 100ns

Hmm,
The 100 ns will be a problem for both the driver and the IGBT I think.
http://www.irf.com/product-info/datasheets/data/ir25607.pdf