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Switching power supply control device and control method and switching power supply system

A switching power supply and control device technology, which is applied in the output power conversion device, electrical components, and AC power input into DC power output, etc., can solve the problem of switching power supply security, stability and reliability. , The overvoltage protection of switching power supply is not accurate enough, etc.

Active Publication Date: 2017-08-29
BYD SEMICON CO LTD
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AI Technical Summary

Problems solved by technology

In this primary sampling method, the influence of the sampled voltage through the transformer and the feedback branch will inevitably introduce interference, resulting in inaccurate overvoltage protection of the switching power supply, prone to false protection, and the safety, stability and reliability of the switching power supply. insufficient

Method used

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  • Switching power supply control device and control method and switching power supply system
  • Switching power supply control device and control method and switching power supply system
  • Switching power supply control device and control method and switching power supply system

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Embodiment Construction

[0036] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0037] figure 1 It is a structural block diagram of a control device for a switching power supply provided in an exemplary embodiment. Such as figure 1 As shown, the control device may include a generation module 11 and a control module 12 .

[0038] The generating module 11 can be used for generating an overvoltage protection signal when the output voltage of the secondary side of the switching power supply is greater than a predetermined first voltage threshold. The control module 12 can be used to control the driving control circuit of the primary side of the switching power supply according to the overvoltage protection signal, so that the switching power...

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Abstract

The invention discloses a switching power supply control device and control method and a switching power supply system. The control device comprises a generation module which is used for generating overvoltage protection signals when the output voltage of the secondary side of a switching power supply is greater than a preset first voltage threshold; and a control module which is used for controlling the driving control circuit of the primary side of the switching power supply according to the overvoltage protection signals so that the switching power supply is enabled to restart. According to the control device and the control method, the error caused by the influence of the transformer and the feedback branch in the primary sampling mode can be avoided so that overvoltage protection of the switching power supply can be more accurately realized.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a control device, a control method and a switching power supply system of a switching power supply. Background technique [0002] As a mainstream power supply solution for mobile electronic devices such as mobile phones and notebook computers, switching power supplies have the advantages of small size, high efficiency, and high precision of constant voltage. With the development of mobile electronic equipment technology and the increasing emphasis on energy and the environment in the power supply field, today's switching power supplies have put forward higher requirements for work efficiency, no-load power consumption, safety, reliability, etc., which also makes research and development Researchers continue to improve the chip control method, expecting to find a more advantageous method to solve these problems. [0003] Synchronous rectification is a new technology that uses M...

Claims

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Application Information

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IPC IPC(8): H02M1/32H02M7/217
CPCH02M1/32H02M7/217H02M1/325
Inventor 侯永军王文情
Owner BYD SEMICON CO LTD
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