Title:
DIRECT FILTERING TYPE SWITCH POWER SUPPLY
Document Type and Number:
WIPO Patent Application WO/2017/124744
Kind Code:
A1
Abstract:
A direct filtering type switch power supply, used for the occasion comprising a pulse direct current, comprises a filter circuit (200), a main power stage (300), and an indicating circuit. A direct-current input (UDC) is connected to the filter circuit by means of an indicating circuit. The filter circuit and the main power stage are connected in parallel. The indicating circuit is composed of a light-emitting unit and an inductor (L) by means of parallel connection so as to ensure that the direction of the direct-current input passing through the inductor is opposite to the conduction direction of the light-emitting unit. The filtering unit comprises at least one electrolytic capacitor (CL). When an electrolytic capacitor is normal, an excitation current of a switching tube (V) in the main power stage almost does not appear in the inductor, and an LED in the light emitting unit does not emit light. When the equivalent series resistance (ESR) of the electrolytic capacitor sharply rises, an excitation current of the switching tube appears in the inductor (L). Besides, when the switching tube is switched off, an excitation current flowing through the inductor cannot change abruptly, the excitation current passes through the LED for implementing a follow current and drives the LED to emit light, and thus a user is prompted that the circuit electrolytic capacitor may have the risk of complete failure. The LED may also be an optical coupling light emitting device. The switch power supply has the characteristics of being low in cost, constant in efficiency and easy to implement.
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Inventors:
WANG BAOJUN (CN)
Application Number:
PCT/CN2016/096529
Publication Date:
July 27, 2017
Filing Date:
August 24, 2016
Export Citation:
Assignee:
MORNSUN GUANGZHOU SCIENCE & TECH LTD (CN)
International Classes:
H02M1/42; H02M3/335; H02M7/217; H05B44/00; H05B45/50
Foreign References:
| CN105491728A | 2016-04-13 | |||
| CN205491305U | 2016-08-17 | |||
| CN105577003A | 2016-05-11 | |||
| CN205490207U | 2016-08-17 | |||
| CN105676936A | 2016-06-15 | |||
| CN105676937A | 2016-06-15 | |||
| CN105527524A | 2016-04-27 | |||
| CN103605084A | 2014-02-26 | |||
| CN103390879A | 2013-11-13 | |||
| JP2012142132A | 2012-07-26 |
Attorney, Agent or Firm:
GUANGZHOU ZHIYOU PATENT & TRADEMARK AGENCY CO., LTD (CN)
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