Soft switching control method of buck converter based on optocoupler detection

An optocoupler detection and control method technology, applied in control/regulation systems, output power conversion devices, DC power input conversion to DC power output, etc. Effect

Active Publication Date: 2017-02-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing soft switching method of the DC converter needs to add auxiliary circuits, which will cause complex systems, and provides a Buck converter soft switching control method based on optocoupler detection

Method used

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  • Soft switching control method of buck converter based on optocoupler detection
  • Soft switching control method of buck converter based on optocoupler detection
  • Soft switching control method of buck converter based on optocoupler detection

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specific Embodiment approach 1

[0023] Specific implementation mode one: the following combination Figure 1 to Figure 3 Describe this embodiment, the Buck converter soft switching control method based on optocoupler detection described in this embodiment, the control method uses the optocoupler detection circuit 1 to detect and obtain the voltage of the midpoint of the Buck converter bridge arm, through the midpoint of the bridge arm The on-off state of the freewheeling diode in the Buck converter is obtained by the voltage, and then the zero-current turn-on signal of the IGBT module 2 is obtained, and then the soft switching control of the Buck converter is realized according to the zero-current turn-on signal; the IGBT module 2 comes with Diode D 1 , and a high-frequency capacitor C is connected in parallel at both ends of the IGBT module 2 .

[0024] In this embodiment, the high-frequency capacitor C is a small-capacity high-frequency capacitor.

specific Embodiment approach 2

[0025] Specific implementation mode two: the following combination figure 1 with figure 2 This embodiment will be described. This embodiment will further describe the first embodiment. The structure of the Buck converter is as follows: a filter capacitor C is connected in parallel between the two input terminals of the Buck converter. 1 , IGBT module 2 and freewheeling diode D 2 The anti-series constitutes the chopping bridge arm, the chopping bridge arm and the filter capacitor C 1 In parallel, the midpoint A of the bridge arm is the IGBT module 2 and the freewheeling diode D 2 The connection point between the bridge arm midpoint A is connected to one end of the filter inductor L, and the other end of the filter inductor L is connected to the output filter capacitor C 2 , filter capacitor C 2 The two ends of are used as the two output ends of the Buck converter;

[0026] The detection end of the optocoupler detection circuit 1 is connected to the midpoint A of the bridg...

specific Embodiment approach 3

[0028] Specific implementation mode three: the following combination figure 2 Describe this embodiment mode. This embodiment mode will further explain Embodiment 2. The optocoupler detection circuit 1 is composed of a high-speed optocoupler OC and its peripheral circuit. The peripheral circuit includes a +15V power supply, a current limiting resistor R 1 , high voltage fast recovery diode D 3 , output pull-up resistor R 2 and +5V power supply, where the +15V power supply shares the ground with the Buck converter, and the +5V power supply is isolated from the Buck converter;

[0029] Between the input terminal and the detection terminal of the optocoupler detection circuit 1, the current limiting resistor R 1 , high-speed photocoupler OC and high-voltage fast recovery diode D 3 In series, the high-voltage fast recovery diode D 3 The cathode of the bridge arm is connected to midpoint A; the optocoupler output signal of optocoupler detection circuit 1 is u A , the optocoupl...

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Abstract

The invention discloses an optical coupling detection based Buck convertor soft-switching control method and belongs to the technical field of direct-current converters. The optical coupling detection based Buck convertor soft-switching control method aims at solving the problem that an existing direct-current converter soft switching method needs an auxiliary circuit and accordingly system complex is caused. According to the optical coupling detection based Buck convertor soft-switching control method, an optical coupling detection circuit is adopted to detect and obtain voltage of a middle point of a Buck convertor bridge arm, the on-off state of a fly-wheel diode in a Buck convertor is obtained according to the voltage of the middle point of the bridge arm, further a zero-current opening signal of an IGBT module is obtained, and Buck convertor soft-switching control is achieved according to the zero-current opening signal. The IGBT module is provided with a diode D1, and the IGBT module is in parallel connection with a high-frequency capacitor C. The optical coupling detection based Buck convertor soft-switching control method is used for Buck convertor soft-switching control.

Description

technical field [0001] The invention relates to a soft switch control method of a Buck converter based on optocoupler detection, and belongs to the technical field of DC converters. Background technique [0002] DC converters are widely used in switching power supplies, new energy power generation, micro-grid and other fields. The DC converter using hard switching technology has the disadvantages of large device switching loss, low system efficiency, and low switching frequency. For this reason, soft switching control technologies have emerged, such as resonant soft switching, ZVS-PWM, ZCS-PWM, ZVT, ZCT, etc. , these soft switching techniques need to increase the auxiliary circuit, making the system complex. [0003] When the inductor current in the Buck converter is intermittent, resonance will occur on the inductor and the IGBT parasitic capacitance, which will increase the potential of the midpoint of the bridge arm. Triggering the IGBT conduction under the condition of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155H02M1/36
CPCH02M1/083H02M3/155Y02B70/10
Inventor 安群涛孙东阳凡绍桂孙力
Owner HARBIN INST OF TECH
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