Start control method for an asymmetric half-bridge flyback converter and control circuit thereof

A technology of flyback converter and start-up control, which is applied in the direction of control/regulation system, DC power input conversion to DC power output, instruments, etc. It can solve the problems of affecting the efficiency of the power supply system and reducing the reliability of the system, so as to improve performance and Reliability, reduced starting voltage stress, and reduced rate of change effects

Active Publication Date: 2021-01-29
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] In view of the limitations of the above methods, many technicians want to find a way to solve the voltage stress problem from the mechanism generated by the transient secondary rectifier tube at startup
In view of this, the present invention proposes an asymmetrical half-bridge flyback converter start-up control circuit and its control method, which can solve the problems of existing technical solutions affecting power system efficiency, reducing system reliability and application limitations

Method used

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  • Start control method for an asymmetric half-bridge flyback converter and control circuit thereof
  • Start control method for an asymmetric half-bridge flyback converter and control circuit thereof
  • Start control method for an asymmetric half-bridge flyback converter and control circuit thereof

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no. 1 example

[0061] Figure 5 It is the schematic circuit diagram of the first embodiment of the present invention, a starting control circuit (control circuit) of an asymmetrical half-bridge flyback converter, including a starting control unit circuit and a driving control unit circuit, wherein the starting control unit circuit includes a monostable Trigger 74HC123, pulse width time adjustment circuit and monostable trigger power supply circuit, pulse width time adjustment circuit includes resistor R6, capacitor C7, resistor R9 and capacitor C11, monostable trigger power supply circuit includes capacitor C9, capacitor C3 and Diode D6.

[0062] The drive control unit circuit includes a start-up drive conversion circuit, a drive circuit and a drive control power supply circuit. The start-up drive conversion circuit includes a triode T4, a triode T5, a resistor R3, a resistor R4, a switch tube Q4, a resistor R2 and a voltage regulator tube D5. The drive circuit includes The resistor R1, the...

no. 2 example

[0078] Figure 8 Shown is the actual application block diagram of the circuit of the second embodiment of the present invention, the second embodiment integrates the circuit (control circuit) of the present invention inside the main control IC circuit unit, compared with the first embodiment, the difference lies in: the second The clamped asymmetric flyback converter of the embodiment also includes a high-side drive power supply circuit, the high-side drive power supply circuit includes a diode Dsw and a capacitor Csw connected in series, the anode of the diode Dsw is connected to the Vcc terminal of the auxiliary power supply, and the cathode of the diode Dsw is connected to the capacitor Csw One end of the capacitor Csw is connected to the control circuit.

[0079] Figure 9 It is a detailed block diagram of the actual application of the circuit in the second embodiment of the present invention. A start-up control circuit (control circuit) of an asymmetrical half-bridge fly...

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Abstract

The invention provides a start control method for an asymmetric half-bridge flyback converter, and the method comprises the steps: a start control step: receiving a start state triggering signal outputted by a main control IC circuit unit of the asymmetric half-bridge flyback converter, and outputting a start control signal during the existence of the start state triggering signal; and a driving control step of receiving the starting control signal, stabilizing the driving signal within a relatively low voltage during the existence of the starting control signal, and outputting the processed driving signal for driving a switching tube of the asymmetric half-bridge flyback converter. The switching speed of the main switch can be greatly reduced due to driving of small voltage, so that peaksgenerated by dV / dt and di / dt in the starting process are greatly reduced, and correspondingly, the starting voltage stress of the rectifier tube is reduced. The invention further provides a control circuit corresponding to the method.

Description

technical field [0001] The invention relates to the field of asymmetrical half-bridge flyback converters, in particular to a control method for starting an asymmetrical half-bridge flyback converter and a control circuit thereof. Background technique [0002] Since the 1960s, most of the switching converters that have been developed and applied are hard switching technology. However, with the development of science and technology, all walks of life have put forward higher requirements for power supplies, and high efficiency, high power density, and miniaturization have become the main topics of research in the power supply industry. Soft switching technology offers the possibility to fulfill these high requirements. The soft switching technology mainly includes zero-voltage switching (Zero-Voltage-Switching), referred to as ZVS; zero-current switching (Zero-Current-Switching), referred to as ZCS. The Asymmetric Half-Bridge Flyback (AHBF) topology is a topology that uses so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M3/335
CPCH02M1/36H02M3/33569
Inventor 张法旺江波杜波
Owner MORNSUN GUANGZHOU SCI & TECH
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