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Valley-fill power factor correction circuit with EMI protection function

A valley-filling and circuit technology, which is applied in the field of electromagnetic interference improvement of switch-mode power supplies, and can solve problems such as total harmonic distortion and current asymmetry

Pending Publication Date: 2021-09-10
ELITE SEMICON MEMORY TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the power factor control circuit 100 is charged in series and discharged in parallel, which causes current asymmetry, which may lead to more serious total harmonic distortions (THD)

Method used

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  • Valley-fill power factor correction circuit with EMI protection function
  • Valley-fill power factor correction circuit with EMI protection function
  • Valley-fill power factor correction circuit with EMI protection function

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Embodiment Construction

[0038] Certain terms are used in the specification and subsequent claims to refer to particular components. Those of ordinary skill in the art will appreciate that hardware manufacturers may refer to the same component by different terms. This specification and subsequent patent applications do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. The "comprising" mentioned throughout the specification and the following claims is an open term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" herein includes any direct and indirect means of electrical connection. Therefore, if it is described that a first device is coupled to a second device, it means that the first device may be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means.

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PUM

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Abstract

A power supply control circuit comprises an AC power supply, a rectifier and a valley-fill circuit. The AC power supply receives an AC voltage, and the rectifier converts the AC voltage into a rectified voltage. The valley-fill circuit comprises an inductor having a first endpoint coupled to the rectifier and a second endpoint; a first resistor having a first endpoint coupled to the second endpoint of the inductor, and having a second endpoint; a diode having a cathode coupled to the second endpoint of the inductor, and having an anode; and a first capacitor having a first terminal coupled to the second terminal of the first resistor and the anode of the diode, and a second terminal coupled to ground.

Description

technical field [0001] The present invention relates to a passive valley-fill power factor correction (PFC) architecture that converts an AC voltage to a DC voltage, and more particularly to switching-mode power supply (SMPS) in electromagnetic Improvements in electromagnetic interference (EMI). Background technique [0002] Power factor is very important for judging whether an electronic product is working efficiently. Power factor can be calculated by comparing real power with apparent power. Real power is used to indicate the effectiveness of work and includes only the real component of the AC power supply, while apparent power is the average product of current and voltage, including the real and imaginary components of the AC power supply. [0003] A power system with a lower power factor will consume more circulating current than a power system with a higher power factor while producing the same amount of usable power because the power returned to the load is larger ,...

Claims

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Application Information

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IPC IPC(8): H02M1/42H02M1/44
CPCH02M1/4208H02M1/44Y02B70/10
Inventor 许哲玮余文隆
Owner ELITE SEMICON MEMORY TECH INC