| 摘要 |
A wave loss detection circuit for a drive signal and a switching transistor drive circuit are disclosed. The wave loss detection circuit includes: a diode, a first resistor, a first energy storage unit, a second resistor, and a comparison unit, where: an anode of the diode is configured to receive a first drive signal, and a cathode of the diode is connected to a first end of the first resistor; a second end of the first resistor is connected to a first end of the first energy storage unit, a first end of the second resistor, and a first input end of the comparison unit; a second end of the first energy storage unit and a second end of the second resistor are connected to a ground level, and a resistance of the first resistor is less than a resistance of the second resistor; a second input end of the comparison unit is configured to receive a threshold voltage, and if a voltage signal received by the first input end is less than the threshold voltage, a first voltage signal is output, which indicates that a wave loss occurs in the first drive signal, where the threshold voltage is a critical voltage of the first drive signal at a high level. It may be learned that in embodiments of the present invention, wave loss detection is implemented by using a basic component, and no sensor is needed, so that costs are reduced. |
