Title:
CONTROL CIRCUIT WITH HIGH POWER FACTOR AND AC/DC CONVERSION CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2021/057851
Kind Code:
A1
Abstract:
A control circuit with a high power factor that is applied to an AC/DC conversion circuit. The conversion circuit comprises a rectification module, a conversion module and a load, wherein the rectification module receives an alternating current and rectifies same into a direct current, the conversion module converts the direct current to a drive power according to the load and provides the drive power for the load, the conversion module comprises a conversion unit having an inductance element and a switch unit switched between an on state and an off state, and a current passing through the inductive element forms a ripple remaining on the basis of the alternating current. The control circuit comprises a peak value limiting unit and a drive unit, wherein the peak value limiting unit inputs a reference signal and generates at least one peak value limiting signal according to a sampling signal, and the drive unit is coupled to the switch unit and controls switching of the switch unit on the basis of the peak value limiting signal, so that at least within half a power frequency period, when a voltage on the inductance element is higher than a threshold value, the ripple of the current of the inductance element is not higher than a limit value.
Inventors:
GAO XIAORU (CN)
SUN SHUNGEN (CN)
SUN SHUNGEN (CN)
Application Number:
PCT/CN2020/117483
Publication Date:
April 01, 2021
Filing Date:
September 24, 2020
Export Citation:
Assignee:
SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD (CN)
International Classes:
H02M1/42; H02M1/14; H02M7/04; H05B44/00
Foreign References:
| CN110535337A | 2019-12-03 | |||
| CN103280965A | 2013-09-04 | |||
| CN103296904A | 2013-09-11 | |||
| CN107426880A | 2017-12-01 | |||
| CN103036427A | 2013-04-10 | |||
| US8432713B2 | 2013-04-30 |
Attorney, Agent or Firm:
LECOME INTELLECTUAL PROPERTY AGENT LTD. (CN)
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