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Closed-loop active driving circuit and method, and switching power supply

A driving circuit and source driving technology, applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of increasing switching tube loss, inability to control the driving speed, voltage overshoot and current overshoot, etc., to reduce overshoot, Increase the loss, optimize the effect of optimization goals

Active Publication Date: 2021-07-09
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method cannot control the driving speed of each stage of the switching process of the switching tube. For high-speed switching chips such as SiC and GaN, the driving signal will cause a large voltage overshoot and current overshoot during the switching process of the switching tube.
In order to deal with overshoot, the existing method is to increase the drive resistance of the gate loop in the drive circuit, but increasing the gate resistance will significantly increase the loss of the switch tube

Method used

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  • Closed-loop active driving circuit and method, and switching power supply
  • Closed-loop active driving circuit and method, and switching power supply
  • Closed-loop active driving circuit and method, and switching power supply

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Embodiment 1

[0023] In the existing power switch tube driving circuit, the control signal of the switch tube is a square wave voltage signal Vg. During the switching process, Vg charges and discharges the gate capacitance of the switch tube to obtain the corresponding gate voltage V GS . For high-speed switching chips such as SiC and GaN, the switching process is very fast, resulting in large voltage overshoot and current overshoot. If you want to reduce this overshoot, the traditional method can only increase the drive resistance of the gate loop, but increasing the gate resistance will significantly increase the switching loss.

[0024] figure 1 It is a structural schematic diagram of a closed-loop active drive circuit for driving a power switch tube disclosed in the present application. figure 1 The far right in the middle is a power switch bridge arm, including two power switch tubes. The control circuits of the two power switch tubes are the same, and the following description onl...

Embodiment 2

[0052] image 3 It is a closed-loop active driving method for driving a power switch tube disclosed in the second implementation of the present application. The driving method is realized based on the above-mentioned closed-loop active circuit. The driving method includes the following steps:

[0053] S1. The main control unit 101 collects the power switch tube Q 1 The DC bus voltage and the steady-state value of the inductor current generate a PWM drive signal and output it to the isolated drive unit 102, and at the same time calculate the two controllable current sources A in the drive circuit 105 I and A O The turn-on and turn-off time of the drive circuit 105 will be two controllable current sources A I and A O The on-off time information of is output to the isolation communication unit 103.

[0054] S2. The isolation drive unit 102 receives the PWM drive signal output by the main control unit 101, electrically isolates the PWM drive signal, and converts the PWM driv...

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Abstract

The invention discloses a closed-loop active driving circuit and method, and a switching power supply. The closed-loop active circuit comprises: a main control unit which is used for collecting the steady-state values of the DC bus voltage and the inductive current of a power switching tube, generating a driving signal, and calculating the on-off time information of two controllable current sources at the same time; a slave control unit used for generating control signals of the two controllable current sources according to the on-off time information of the two controllable current sources and the rising edge and the falling edge of the driving signal, and outputting the control signals to a driving circuit; and the driving circuit comprising a driving input end, a first control input end, a second control input end and a driving output end, and used for receiving the driving signal output by the main control unit and the control signals of the two controllable current sources output by the slave control unit, and outputting the driving signal to a power switch tube in a selected time period.

Description

technical field [0001] The invention relates to the technical field of switching tube control, in particular to a closed-loop active drive circuit for driving a power switching tube, a driving method and a switching power supply. Background technique [0002] The existing switch tube drive circuit consists of a main controller, an isolation driver and an amplifier circuit. The main controller generates a PWM signal for the switch tube of the main power circuit, and the PWM signal is output to the gate of the power switch tube through the isolation driver and the amplifier circuit. . This method cannot control the driving speed of each stage of the switching process of the switching tube. For high-speed switching chips such as SiC and GaN, the driving signal will cause a large voltage overshoot and current overshoot during the switching process of the switching tube. In order to cope with the overshoot, the existing method is to increase the driving resistance of the gate lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08
CPCH02M1/08
Inventor 姚文熙陆雅婷陈朝锋王伯旺
Owner ZHEJIANG UNIV