High-voltage charge pump circuit

Abstract

The invention relates to a high-voltage charge pump circuit and belongs to the motor field. The high-voltage charge pump circuit is composed of a two-phase voltage multiplier circuit, an output voltage difference detection circuit, a pump capacitor left pole plate voltage difference detection circuit and a driver circuit. According to the novel charge pump circuit, a novel power MOSFET is adopted as a switching tube; the input and output voltage of the circuit ranges from 13 V to 45V; drivers complete the control of the shift function of brainwashing and the control of the switching on and switching off of the switching tube; and the high-voltage difference detection circuit is designed in the circuit to detect the difference values of pump capacitor left pole plate voltage, output voltage and power source voltage, adopts detection results as the input signals of a linear modulation circuit so as to generate feedback signals. The high-voltage charge pump circuit has the advantages of compact circuit structure, stable charge-discharge process, linear change of output voltage with input voltage, stable voltage and low ripples.

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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