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Title:
SWITCHING POWER SUPPLY HAVING SOURCE POWER FACTOR CORRECTION
Document Type and Number:
WIPO Patent Application WO/2018/024036
Kind Code:
A1
Abstract:
A switching power supply having source power factor correction comprises a power factor correction (PFC) circuit, a filter circuit (200), a main power level component (300), and an indicating circuit (400). The indicating circuit (400) comprises a terminal (1, 2), a resistor (R1), a capacitor (C1), a diode (D1), and a light-emitting diode (LED). The LED and the D1 are reversely connected in parallel, then are connected in parallel to the R1, and then are serially connected to the C1, and the indicating circuit (400) and a filter electrolysis device CA2 are connected in parallel. The capacity of the C1 is small, a current of a power frequency multiplication sine ripple caused by the PFC and passing through the C1 is very small, and a voltage drop generated on the R1 is insufficient to light the LED; as the ESR of the CA2 increases, a voltage drop generated on the ESR by high-frequency charging and discharging currents synchronously increases, and accordingly a formed high-frequency ripple voltage increases; the C1 has a high-frequency switching-on effect, and when the high-frequency ripple voltage on the ESR reaches a threshold, the LED is lit, and the threshold can be adjusted by adjusting the resistance of the R1. In this way, a user is reminded that the ESR of the electrolysis device CA2 has increased, and the switching power supply has the risk of ineffectiveness. The circuit has low costs and is easy to implement, and does not use inductance detection.

Inventors:
WANG, Baojun (No.5 Kehui St. 1, Kehui Development CenterScience Ave., Science City,Guangzhou Development Distric, Guangzhou Guangdong 3, 510663, CN)
Application Number:
CN2017/088001
Publication Date:
February 08, 2018
Filing Date:
June 13, 2017
Export Citation:
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Assignee:
MORNSUN GUANGZHOU SCIENCE & TECHNOLOGY LTD. (No.5 Kehui St. 1, Kehui Development CenterScience Ave., Science City,Guangzhou Development Distric, Guangzhou Guangdong 3, 510663, CN)
International Classes:
H02M7/217; H02M1/00
Foreign References:
CN106208759A2016-12-07
CN105577003A2016-05-11
CN202975207U2013-06-05
US7855514B22010-12-21
BRPI0901619A22011-01-25
Attorney, Agent or Firm:
GUANGZHOU ZHIYOU PATENT & TRADEMARK AGENCY CO., LTD (Room 2305-06, Yuehai Group Building555 Dong Feng Dong Road, Yuexiu Disric, Guangzhou Guangdong 0, 510050, CN)
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