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Control circuit of switching power supply

A technology for controlling circuits and switching power supplies, which is applied in the field of circuits and can solve problems such as heavy loads and untimely switching of switching power supply operating frequencies

Active Publication Date: 2018-08-03
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] An embodiment of the present invention provides a control circuit for a switching power supply to at least solve the technical problem in the related art that the operating frequency of the switching power supply is not switched in time due to the sudden increase in load

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  • Control circuit of switching power supply
  • Control circuit of switching power supply
  • Control circuit of switching power supply

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Embodiment Construction

[0023] 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.

[0024] This application provides a control circuit for switching power supply, such as figure 1 As shown, the control circuit may include:

[0025] The output circuit 10 is used to supply power to the load 11 .

[0026] The voltage comparison circuit 12 is connected to the output circuit, and is used for generating a wake-up signa...

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Abstract

The invention discloses a control circuit of a switching power supply. Wherein, the control circuit includes: an output circuit, used to supply power to the load; a voltage comparison circuit, connected to the output circuit, used to generate a wake-up signal when the collected output voltage of the output circuit is lower than the first reference voltage; a control module, They are respectively connected with the voltage comparator circuit and the switching power supply, and are used to control the switching power supply to operate at high frequency according to the wake-up signal. The invention solves the technical problem in the related art that the operating frequency switching of the switching power supply is not switched in time due to sudden heavy load.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a control circuit of a switching power supply. Background technique [0002] Switching power supply is widely used in various electronic equipment and home appliances because of its high efficiency, small size and low cost. Because the switching power supply does not distinguish between the standby state and the working state, the operating frequency of the switching power supply will not change even though the electronic device is in the standby state, which undoubtedly leads to energy waste. [0003] In the existing switching power supply control design, the operating frequency of the switching power supply is switched by detecting the load current, that is, when the load current is small, the switching power supply switches to low-frequency operation. [0004] It should be noted that, in the above switching power supply control scheme, when the load becomes larger, the current detecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/08H02M7/217H02M3/335
CPCH02M1/08H02M3/335H02M7/217H02M1/0032Y02B70/10
Inventor 林晖薄传海
Owner GREE ELECTRIC APPLIANCES INC