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Power controllers and control methods thereof

A technology of power supply controller and control method, applied in control/regulation systems, instruments, electrical components, etc., can solve problems such as ripple, inability to meet output voltage specification requirements, and excessive output voltage

Active Publication Date: 2020-02-07
LEADTREND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of line voltage ripple and the limitation of system control bandwidth, the output voltage may generate excessive ripple, which cannot meet the output voltage specification requirements

Method used

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  • Power controllers and control methods thereof
  • Power controllers and control methods thereof
  • Power controllers and control methods thereof

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Embodiment Construction

[0019] In this specification, there are some same symbols, which represent components with the same or similar structures, functions, and principles, and can be deduced by those skilled in the art based on the teachings of this specification. For the sake of brevity in the description, components with the same symbols will not be repeated.

[0020] figure 1 It is a switching power supply 10 with a flyback structure. In the switching power supply 10, the bridge rectifier BD converts the AC mains V AC rectified to line voltage V LINE . Power controller 12, which can be an integrated circuit, provides drive signal S DRV , used to turn on or turn off the power switch 20 to control the energy storage and energy release of the transformer. The transformer has a primary winding PRM, an auxiliary winding AUX, and a secondary winding SEC. When the power switch 20 is turned on, the line voltage V LINE Make the primary winding PRM store energy; when the power switch 20 is turned o...

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PUM

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Abstract

One embodiment of the present invention provides a control method, adapted to a switch-type power supply. The control method is used for converting a line voltage to output an output voltage. The control method includes detecting the line voltage, comparing the line voltage and a lower limit voltage; and generating a control signal when the line voltage is lower than the lower limit voltage, thereby increasing a power conversion of the switch-type power supply to supply the output voltage.

Description

technical field [0001] The present invention generally relates to a control method and a power controller of a switch mode power supply, especially relates to a switch mode power supply adopting primary control. Background technique [0002] A power supply is an essential device for almost all electronic products. For example, the power supply can convert the AC mains power into the power specification required by the main circuit (core circuit) of the electronic product. Among all the power supplies, the switching power supply has the advantages of good conversion efficiency and small product size, so it is widely used in this field. [0003] Switching power supplies generally rectify the AC mains to a line voltage first, and then convert the line voltage to an output voltage to meet the rated voltage or rated current required by the load. When the load is heavy, the line voltage may have relative ripple due to the change of the AC mains. Due to the existence of the line...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33523H02M3/33507H02M1/14H02M1/0009H02M3/24H02M3/3353H02M3/335
Inventor 杨丰诚周冠贤
Owner LEADTREND TECH