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Asymmetric half-bridge flyback converter and driving control method therefor

A flyback converter, drive control technology, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve problems such as large loss of asymmetrical half-bridge flyback converters

Active Publication Date: 2017-03-15
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of this, the present invention will solve the problem that the above-mentioned asymmetrical half-bridge flyback converter has a large loss when outputting light load and no-load, and provides a method to reduce the loss of the asymmetrical half-bridge flyback converter when outputting light load and no-load. The drive control method and asymmetrical half-bridge flyback converter, the circuit structure of the asymmetrical half-bridge flyback converter is simple, the output voltage ripple is small at no-load, easy to realize and practical

Method used

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  • Asymmetric half-bridge flyback converter and driving control method therefor
  • Asymmetric half-bridge flyback converter and driving control method therefor
  • Asymmetric half-bridge flyback converter and driving control method therefor

Examples

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no. 1 example

[0050] Figure 3-1 Shows the circuit principle block diagram of the asymmetrical half-bridge flyback converter of the first embodiment of the present invention, Figure 3-2 It is the schematic circuit diagram of the first embodiment of the present invention. The asymmetrical half-bridge flyback converter includes a flyback circuit and a detection control circuit; the flyback circuit includes a primary side circuit and a secondary side output rectification and filtering circuit. The primary side circuit is composed of filter capacitor Cin, resonant capacitor Cr, main switch tube QH, clamp switch tube QL and the primary winding of the transformer T, Lr is the leakage inductance of the primary winding of the transformer T; one end of Cin is connected to the input The positive pole Vin+, the other end is connected to the input ground GND (or the input negative pole), the drain of the main switching tube QH is connected to Vin+, the source is connected to the drain of the clamping...

no. 2 example

[0078] Such as Figure 5 As shown, it is a schematic circuit diagram of the second embodiment of the asymmetrical half-bridge flyback converter according to the present invention, and the dotted box 502 is the drive control module.

[0079]Compared with the first embodiment of the present invention, the difference of the second embodiment is that a driver IC2 is added between the drain output terminal of the N-MOS transistor and the gate of the clamp switch QL for Drive the clamping switch QL more quickly, the input terminal of the driving IC2 is connected to the drain of the N-MOS transistor Q1, the output terminal of the driving IC2 is connected to the gate of QL, and the voltage at the output terminal of the driving IC2 follows the change of the voltage at the input terminal; After IC2 is driven, the driving capability of the entire detection control circuit is enhanced. The working principle of the second embodiment of the present invention is basically the same as that of...

no. 3 example

[0097] Such as Figure 6-1 As shown, it is the schematic circuit diagram of the third embodiment of the asymmetrical half-bridge flyback converter according to the present invention, and the dotted box 601 is the detection control circuit.

[0098] The difference from the first embodiment is the drive control module part. In the third embodiment, the VOB pin of the drive IC1 outputs the drive voltage signal VgsL, and VgsL is connected to the first pin of the first current limiting resistor R11, and the first current limiting The second pin of the resistor R11 is connected to the base of the charging transistor TR1, and also connected to the cathode of the Zener diode Z1, and the anode of the Zener diode Z1 is connected to the input ground GND (that is, the input negative pole of the asymmetrical half-bridge flyback converter); The driving voltage signal VgsL is also connected to the first pin of the second current limiting resistor R12, and the second pin of the second current...

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Abstract

The invention provides an asymmetric half-bridge flyback converter and a driving control method therefor. A load detection circuit detects a load signal of the asymmetric half-bridge flyback converter, compares the load signal with a set load point, forms a feedback signal by the comparison result, and outputs the feedback signal to a driving control module and a main control chip concurrently; the main control chip outputs a PWM signal to a driving circuit; the driving circuit outputs two paths of signals, namely, a main switching tube driving signal and a driving voltage signal; the main switching tube driving signal drives the switch on and switch off of a main switching tube; the driving voltage signal is input to the driving control module; and after the driving control module receives the driving voltage signal and the feedback signal, a first driving signal or a second driving signal is output to control the switch on or switch off of a clamping switching tube. The control method and the control circuit are simple and reliable, easy to realize, capable of solving the problems of high loss in light load output and no load of the asymmetric half-bridge flyback converter, and capable of improving the light load efficiency.

Description

technical field [0001] The invention relates to an asymmetric half-bridge flyback converter and a driving control method thereof. Background technique [0002] With the rapid development of the field of power electronics, switching converters are used more and more widely, especially people put forward more requirements for switching converters with high power density, high reliability and small size. Generally, traditional low-power switching converters are implemented with flyback topology, which has the advantages of simple structure and low cost; however, ordinary flyback topology is hard switching, and cannot recover leakage inductance energy, thus limiting the efficiency and efficiency of small and medium power converters. volume. In order to meet the development trend of miniaturization, light weight and modularization of power converters, soft switching technology has become one of the hot spots in power electronics technology. "Soft switching" refers to zero-volta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33523
Inventor 唐盛斌金若愚郑仁闪
Owner MORNSUN GUANGZHOU SCI & TECH
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