Grid driving circuit provided with voltage clamping function

Abstract

The invention discloses a grid driving circuit provided with a voltage clamping function. The grid driving circuit comprises a current-limiting resistor, a first switch element, an acceleration circuit, a second switch element, and a voltage clamping circuit. The current-limiting resistor is provided with a first end and a second end. The first switch element is coupled with a power supply end and the first end, and is controlled by a control signal. The acceleration circuit is coupled with the first end and the second end, and can be used to provide a current transmission path selectively based on a first bias voltage and the voltage of the second end. The second switch element is coupled with the second end and a grounding terminal, and is controlled by the control signal. The voltage clamping circuit is coupled between the second end and the grounding terminal. When the differential value between first bias voltage and the voltage of the second end is smaller than a first threshold value, the acceleration circuit can stop the current transmission path, and therefore the power consumption of the grid driving circuit can be reduced.

Description

technical field [0001] The present invention relates to a gate drive circuit, and in particular to a gate drive circuit with a voltage clamping function. Background technique [0002] In a switching power application circuit, such as a power factor corrector (Power Factor Correction controller, PFC controller), because the operating environment of the external load and the circuit elements of the control circuit are different, for example, the external load element usually operates at a high voltage environment, and the circuit components used in the control circuit generally operate in a low voltage environment. Therefore, generally, a gate driving circuit is arranged between the control circuit and the load circuit to generate a corresponding driving voltage to drive the load circuit according to the control circuit. [0003] see figure 1 , figure 1 It is a schematic circuit diagram of an existing gate driving circuit. The gate driving circuit 9 is coupled between the ...

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Problems solved by technology

[0007] However figure 1 In the shown gate drive circuit 9, when the PMOS transistor 91 is turned on, the current generated directly flows into the Zener diode 95, which will cause the Zener diode 95 to receive an excessive current and cause overheating, while the gate of the NMOS transistor 97 It will also be damaged due to the excessive current received, making the above-mentioned gate drive circuit 9 unable to operate normally, reducing the overall operating efficiency of the switching power supply application circuit

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