| 摘要 |
A drive signal wave loss detection circuit and switching tube drive circuit. The wave loss detection circuit comprises a diode, a first resistor, a first energy storage unit, a second resistor and a comparing unit, wherein an anode of the diode is used for receiving a first drive signal and a cathode thereof 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 comparing unit; a second end of the first energy storage unit and a second end of the second resistor are connected to a ground level; a resistance value of the first resistor is smaller than a resistance value of the second resistor; a second input end of the comparing unit is used for receiving a threshold voltage, and if a voltage signal received by the first input end is smaller than the threshold voltage, a first voltage signal is output to indicate that wave loss occurs in the first drive signal; and the threshold voltage is a high-level critical voltage of the first drive signal. It can be seen that the embodiment of the present invention realizes wave loss detection through basic elements and devices, no sensor is needed, and the cost is reduced. |
