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Method for realizing adjustable setting of opening and closing of a primary power factor PFC circuit in switching power supply

A switching power supply and power factor technology, applied in the direction of output power conversion devices, high-efficiency power electronic conversion, electrical components, etc., can solve the problems of low average efficiency, failure to enter the market, and low-load efficiency of the power supply.

Pending Publication Date: 2020-12-04
鑫金微半导体(深圳)有限公司
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AI Technical Summary

Problems solved by technology

Because the traditional circuit can’t set whether the PFC is working or not according to the expected power output of the specific application in the non-no-load segment through external adjustment, so the engineering designer cannot make personalized settings to let the switching power supply circuit turn off the PFC to reduce energy consumption. consumption, resulting in waste of electric energy loss, or lowering the efficiency of the low-load section of the power supply, resulting in low average efficiency, resulting in products that cannot meet the government's mandatory energy efficiency indicators and cannot be sold in the market

Method used

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  • Method for realizing adjustable setting of opening and closing of a primary power factor PFC circuit in switching power supply

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Embodiment

[0025] The power detection circuit detects the FB voltage signal fed back from the secondary side of the switching power supply to judge the output power. The FB voltage is sampled at the same time through an external setting resistor to adjust the setting and adjustment of the corresponding power of the FB voltage. Through the power detection circuit To control the on-off control of the power supply Vcc entering the PFC circuit. When the output power is above the power set by the external setting resistor, the Vcc power supply of the PFC circuit is connected, and the PFC circuit works; when the output power is below the power set by the external setting resistor, the Vcc power supply of the PFC circuit is disconnected , the PFC circuit stops working.

[0026] Preferably, in the switching power supply circuit topology, the state setting of PFC operation on and off is to sample the FB signal of the secondary feedback through the power detection circuit, and use an external sett...

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Abstract

The invention provides a method for realizing personalized adjustable setting of opening and closing of a primary power factor PFC circuit in a switching power supply according to user requirements. Through the method, personalized setting of the working state of the PFC circuit can be realized, the working efficiency of the power supply is improved, and the loss is reduced.

Description

technical field [0001] The invention belongs to the design field of integrated circuits and switching power supplies, and relates to a method for adjusting and setting the opening and closing of a primary power factor PFC circuit in a switching power supply. Background technique [0002] At present, in the design of switching power supply, when the power of adapters greater than 72W, or the power supply of some lamps greater than 25W, or other power supplies, after reaching a certain output power, there are mandatory industry standard PFC power factor requirements. However, the PFC power factor adjustment circuit will produce a certain loss, resulting in a decrease in efficiency, and even failing to meet the government's mandatory energy efficiency indicators, resulting in products that cannot be sold in the market or lose market competitiveness due to excessive energy consumption. [0003] At present, the measures to solve the negative impact of the PFC circuit on the effic...

Claims

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Application Information

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IPC IPC(8): H02M1/36H02M1/42
CPCH02M1/36H02M1/4208Y02B70/10
Inventor 夏乾华
Owner 鑫金微半导体(深圳)有限公司
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