Half-bridge driving apparatus

Abstract

The invention discloses a half-bridge driving apparatus comprising a half-bridge driver, a current detection resistor, a non-zero voltage detector and a resonant circuit, wherein the half-bridge driver is coupled with reference grounding voltage and is used for receiving reference power-supply voltage and first and second control signals, enabling the reference power-supply voltage to charge for an output terminal or enabling the reference grounding voltage to discharge for the output terminal based on the first and second control signals respectively; the non-zero voltage detector generates non-zero voltage detection results based on detecting whether voltage of a current detection terminal is less than a presetting reference voltage value of the reference grounding voltage in a detection time period; and the resonant circuit generates driving output voltage based on the voltage on the output terminal. In the detection time period, the reference power-supply voltage and the reference grounding voltage do not carry out charging and discharging action to the output terminal.

Description

technical field [0001] The present invention relates to a half-bridge drive device, and in particular to a non-zero voltage detector of the half-bridge drive device and its detection method. Background technique [0002] Please refer to figure 1 , figure 1 is a schematic diagram of an existing half-bridge driving device 100 . The half-bridge driving device 100 includes a half-bridge driver 110 and a resonant circuit 120 . The half-bridge driver 110 is composed of transistors M1 and M2 connected in series and parasitic diodes D1 and D2 parasitic on the transistors M1 and M2 . The transistors M1 and M2 are respectively controlled by control signals HO and LO. When the transistor M1 is turned on according to the control signal HO (transistor M2 is turned off according to the control signal LO), the output terminal VS of the half-bridge driver 110 is charged according to the reference power supply voltage VBUS. In contrast, when the transistor M2 is turned on according to t...

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Problems solved by technology

This voltage difference will generate a huge current between the channels of the turned-on transistor M2, which may cause the burning of the transistor M2

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