Synchronous-rectification flyback switching power supply device and control method thereof

A technology of synchronous rectification switch and switching power supply, which is applied in the direction of control/regulation system, output power conversion device, electrical components, etc. It can solve the problems of low efficiency and high cost of switching power supply, and achieve high efficiency, less components, and cost reduction. Effect

Inactive Publication Date: 2012-06-13
SHENZHEN LOZEN POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a control method for a synchronous rectification f...

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  • Synchronous-rectification flyback switching power supply device and control method thereof
  • Synchronous-rectification flyback switching power supply device and control method thereof
  • Synchronous-rectification flyback switching power supply device and control method thereof

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Embodiment Construction

[0076] The present invention conceives a flyback switching power supply application framework with synchronous rectification. A fixed predetermined time interval is added at the end of each switching cycle. During this predetermined time interval, the secondary side control circuit detects the output load voltage and / or the size of the current, and compare it with the reference voltage to generate the error signal required for control, and adjust the synchronous rectification switch tube to the transition state (for example, work in the linear region) to couple the signal to the primary side through the main transformer to achieve Control of output voltage or current. So that the entire application architecture achieves the best cost-performance ratio.

[0077] Such as Figure 2A As shown, the synchronous rectification flyback switching power supply device includes a transformer TX4, a primary side control circuit K1, a switching element (such as MOSFET) Q855, a primary side...

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Abstract

The invention relates to a synchronous-rectification flyback switching power supply device and a control method. The control method comprises the following steps of: in a first time interval, transferring energy from a primary side to a secondary side; in a second time interval, generating a feedback signal at the secondary side on the basis of the output load condition, transferring the feedback signal from the secondary side to the primary side, and generating a PWM (Pulse Width Modulation) control signal for controlling on/off action of a switching element at next switching period on the basis of the feedback signal at the first side. The invention provides a solution for high-efficiency isolation type AC (Alternating Current) to DC (Direct Current); and due to adoption of the scheme for time-shared control, the traditional and additional control signal transferring loop is not needed, so that the cost is reduced while ensuring high efficiency of a switching power supply. In addition, due to fewer adopted devices, the reliability is high; and since a datum reference voltage is introduced as the comparison basis in the process for processing sampling signals under the condition of the output load at the secondary side, the control accuracy is greatly improved.

Description

technical field [0001] The invention relates to a switching power supply, more specifically, to a synchronous rectification flyback switching power supply device and a control method thereof. Background technique [0002] In the case of low-voltage and high-current output of a traditional flyback switching power supply, the conduction voltage drop of the rectifier diode is relatively high, and the rectification loss at the output end makes the efficiency of the switching power supply low. For this reason, MOSFETs are used in the industry to replace rectifier diodes, and work in a synchronous rectification mode to achieve the purpose of reducing rectification losses and improving power supply efficiency. Figure 1A Shown is a synchronous rectification switching tube power supply circuit in the prior art. Compared with the switching power supply scheme that uses diodes for rectification, Figure 1A The efficiency of the synchronous rectification switching tube power supply cir...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCY02B70/1475Y02B70/10
Inventor 曾传兴
Owner SHENZHEN LOZEN POWER TECH
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