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Switch power supply control circuit and method

A technology for controlling circuits and switching power supplies, which is applied in the electronic field and can solve problems such as weak anti-surge capability

Active Publication Date: 2015-12-09
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Embodiments of the present invention provide a control circuit and method for a switching power supply to at least solve the technical problem of weak anti-surge capability of the switching power supply control circuit in the prior art

Method used

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  • Switch power supply control circuit and method

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Embodiment Construction

[0024] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0025] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate ...

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Abstract

The invention discloses a switch power supply control circuit and a method. The circuit comprises a switch power supply chip, a protection module, and an adjustment module, wherein the protection module is used for carrying out surge protection on the control circuit and adjusting a protection interval for surge protection, the protection module comprises multiple serial rectifier diodes, and as for a different protection interval, the number of rectifier diodes is correspondingly different; and the adjustment module is respectively connected with the protection module and the switch power supply chip for adjusting the magnitude of input voltage of the switch power supply chip, and the input voltage is first output voltage after AC power passes through the protection module. The technical problem that the switch power supply control circuit in the prior art has a weak anti-surge ability can be solved.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a control circuit and method for a switching power supply. Background technique [0002] In the prior art, a low-power switching power supply with wide voltage input usually requires an external high-frequency transformer. When a high-frequency transformer is connected, it has the following disadvantages: [0003] Disadvantage 1: The cost of the switching power supply increases due to the external connection of a high-frequency transformer in the switching power supply. [0004] Disadvantage 2: In the switching power supply, the external high-frequency transformer occupies a large space on the PCB board. [0005] For switching power supplies, varistors are usually added to prevent the surge current or surge voltage from flowing into the switching power supply control chip in the switching power supply, but the forward surge of 3KV or 4KV can pass through, but the reverse sur...

Claims

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Application Information

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IPC IPC(8): H02M1/32
Inventor 庞维容彭伟唐政清黄宇周葆林李游
Owner GREE ELECTRIC APPLIANCES INC
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