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the customer is using the design on the above coolset IC, and has shared problem faced by him:
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Input—200-800VDC
Output---3 phase AC
Output Power:- 5 & 7.5Hp rating motor
Switching 20~ 100KHz
We have 4 Outputs on the secondary side.
- 5V / 1A - regulated (optocoupler feedback is from this voltage output)
- 7.5V / 0.3A Isolated and unregulated
- 17.5V / 0.75A Isolated and unregulated
- 24V / 0.6A Isolated and unregulated
When we try to increase the load on the secondary the PWM Controller goes into reset mode as the Bias voltage exceeds 22V.
After this, instead of using diodes for rectification on the secondary on 17.5V and 24V we used synchronous rectification on their respective low sides. After this the performance was much better and the bias voltage reduced to 17.5-18V
Can you please guide us on how to resolve the issue and get the same performance without synchronous rectification."---------------------
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Hi @ShV_1494181
Thank you for contributing to the Infineon community.
Can you tell me more about the circuit?
a. Topology?
b. How are you generating Bias Voltage?
b. Any design you're using as a reference,
d. Circuit snapshot or block diagram for circuit analysis.
Regards,
Guruprasad A