Title:
SWITCHING POWER SUPPLY AND TELEVISION
Document Type and Number:
WIPO Patent Application WO/2018/045696
Kind Code:
A1
Abstract:
Disclosed in the present invention are a switching power supply and a television. The switching power supply comprises a constant-current switching circuit, a first single-stage PFC circuit, a first transformer, a constant-current feedback circuit, a constant-voltage switching circuit, a second single-stage PFC circuit, and a second transformer. The constant-current feedback circuit performs sampling on a current output by the first transformer and feeds back the sampled current to the first single-stage PFC circuit; the first single-stage PFC circuit outputs a switching signal according to the sampled current and drives the constant-current switching circuit to be switched off or switched on to control a load current to be constant; the second single-stage PFC circuit outputs a switching signal and drives the constant-voltage switching circuit to be switched off or switched on; and the second single-stage PFC circuit performs sampling on a voltage output by the second transformer to obtain a sampled voltage, and adjusts, according to the sampled voltage, the duty ratio of the switching signal to adjust the voltage output to a main board, so as to control the voltage of the main board to be constant. The technical solution of the present invention can increase power conversion efficiency and stability and can reduce costs.
Inventors:
CHEN JIANZHONG (CN)
YANG JITAO (CN)
YANG JITAO (CN)
Application Number:
PCT/CN2017/070308
Publication Date:
March 15, 2018
Filing Date:
January 05, 2017
Export Citation:
Assignee:
SHENZHEN CHUANGWEI RGB ELECTRONIC CO LTD (CN)
International Classes:
H04N5/63; H05B44/00
Foreign References:
| CN104935843A | 2015-09-23 | |||
| CN205040065U | 2016-02-17 | |||
| CN105934017A | 2016-09-07 | |||
| CN104377971A | 2015-02-25 | |||
| CN105813263A | 2016-07-27 | |||
| US20120025735A1 | 2012-02-02 |
Other References:
See also references of EP 3471512A4
Attorney, Agent or Firm:
CENFO INTELLECTUAL PROPERTY AGENCY (CN)
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