High-voltage charge pump circuit

Abstract

A high-voltage charge pump circuit is suitable for the field of motors. The circuit is composed of a two-phase voltage doubler circuit, an output voltage differential detection circuit, a pump capacitor left plate voltage differential detection circuit, and a driver 2 circuit. The switching tube in the new charge pump circuit adopts a new power MOSFET, and the input and output voltage range of the circuit reaches 13 V ~ 45V. The driver completes the shift function of controlling the brainwashing, and controls the on and off of the switch tube. A high-voltage differential detection circuit is designed in the circuit to detect the difference between the left plate voltage of the pump capacitor and the output voltage and the power supply voltage, and the detection result is used as the input signal of the linear modulation circuit to generate a feedback signal. The circuit structure is compact, the charging and discharging process is stable, the output voltage changes linearly with the input voltage, and the voltage is stable and the ripple is low.

Description

Technical field [0001] The invention relates to a high-voltage charge pump circuit, which is suitable for the motor field. Background technique [0002] The charge pump based on switched capacitor technology is widely used in boost circuit modules in various chips due to its excellent characteristics of low cost, low electromagnetic interference and high power efficiency. The stepper motor drive chip mainly includes a control circuit, an H-bridge drive circuit and a power management module. Among them, the H-bridge gate drive voltage comes from the boost output voltage of the charge pump circuit in the power management module. The charge pump circuit converts the high voltage of the driver chip with a wide input range into a boost output voltage that is linearly related to the input voltage. A special feedback control loop needs to be designed in the charge pump to adjust and stabilize the output voltage. In different applications, the feedback detection circuit and feedback co...

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Problems solved by technology

The voltage feedback detection circuit mainly adopts the resistance voltage division method, which is not suitable for the high-voltage differential detection requirements in the high-voltage charge pump; there are many kinds of feedback control modes, the control is complicated, and the speed of the feedback detection circuit of the circuit is high, so it is not suitable for high-voltage circuits. Charge pump design; the charging and discharging method of capacitors in low-voltage circuits has low start-up efficiency in high-voltage circuits, long start-up time, and large peak current during discharge, which cannot be applied to charge pump design in high-voltage circuits

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