A pair of power amplifier transistors in the inverter power stage were damaged. After replacing the transistors of the same model, they burned out again after running for a period of time. The reason for the excessive current is:
Reference address：The inverter power amplifier transistor is damaged due to excessive current. What are the reasons for excessive current?
——Overcurrent protection failure. When overcurrent occurs at the inverter output, the overcurrent protection circuit does not work;
——The pulse width modulation (PWM) component fails. The two complementary waveforms of the output are asymmetrical. One is on for a long time, while the other is on for a short time, which makes the two arms work unbalanced, or even both arms are turned on at the same time, causing damage to both tubes.
——The parameters of the power tubes vary greatly. At this time, even if a symmetrical waveform is input, the output will be asymmetrical. This waveform passes through the output transformer, causing bias magnetism, that is, unbalanced magnetic flux. The accumulation of this will cause the transformer to saturate and the current to surge, burning out the power tubes. When one burns out, the other will also burn out.
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