High-voltage power supply system with enable control

Abstract

The invention discloses a high-voltage power supply system with enable control. The high-voltage power supply system comprises a high-voltage starting circuit, a PWM control module and a drive module, wherein the high-voltage starting circuit comprises a first transistor, a third transistor, a fourth transistor, a resistor, a diode, a VDD detection unit and an I / O interface unit; the high-voltage starting circuit is controlled by an input of an EN pin; when the EN pin is set, the working state of the high-voltage starting circuit is shielded and the power supply system is shut down, is not restarted and enters a zero stand-by state; and when the EN pin is reset, the high-voltage starting circuit returns to work and the power supply system is restarted and enters a normal working state. The high-voltage starting circuit power supply system with enable control has the characteristic that standby input power consumption and input current of the system are close to zero.

Description

technical field [0001] The invention relates to a high-voltage power supply system with enabling control, which is suitable for switching power supply chips and belongs to the technical field of power semiconductors. Background technique [0002] Currently, high-voltage start-up circuits such as figure 1 As shown, it includes a transistor M1, a resistor R1, a diode D1 and a VDD detection unit. The connection relationship is: the drain of transistor M1 is connected to the first end of resistor R1 and the HV pin, the gate of transistor M1 is connected to the second end of R1, the cathode of diode D1, and the drain of transistor M3, and the source of transistor M1 is connected to VDD detection The input end of the unit 101 is connected to the VDD pin and the VDD capacitor C1, and the anode of the diode D1 is connected to the source of the transistor M3 and connected to the power ground. The gate of the transistor M3 is connected to the output terminal of the VDD detection uni...

AI Technical Summary

Problems solved by technology

Nevertheless, the power supply system using this high-voltage startup circuit has the problem of high standby input power consumption (higher than 50mW) or high standby input current (higher than 300uA) because the high-voltage startup circuit and the power supply are in the working state during standby.

Wastes energy and is not suitable for applications that require very little standby input power consumption or very little standby input current

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