Invention Grant
US09106151B2 Power-factor-improving circuit and method for an offline converter
有权
用于离线转换器的功率因数改善电路和方法
- Patent Title: Power-factor-improving circuit and method for an offline converter
- Patent Title (中): 用于离线转换器的功率因数改善电路和方法
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Application No.: US13659431Application Date: 2012-10-24
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Publication No.: US09106151B2Publication Date: 2015-08-11
- Inventor: Roland Van Roy , Leng-Nien Hsiu , Pei-Yuan Chen
- Applicant: Richtek Technology Corp.
- Applicant Address: TW Chupei
- Assignee: RICHTEK TECHNOLOGY CORP.
- Current Assignee: RICHTEK TECHNOLOGY CORP.
- Current Assignee Address: TW Chupei
- Agency: Muncy, Geissler, Olds & Lowe, P.C.
- Priority: TW100139378A 20111028
- Main IPC: G05F5/00
- IPC: G05F5/00 ; H02M1/42 ; H02M1/00
Abstract:
A power-factor-improving circuit and method for an offline converter block the DC component and obtain the AC component of an input voltage of the offline converter. The AC component is superpositioned onto a DC bias signal to generate a dimming signal for the offline converter to adjust an output current of the offline converter. The offline converter has a high power factor due to the dimming signal with the AC component of the input voltage. In addition, the average of the dimming signal is determined by the DC bias signal, hence the output current can be precisely controlled according to the DC bias signal.
Public/Granted literature
- US20130107591A1 POWER-FACTOR-IMPROVING CIRCUIT AND METHOD FOR AN OFFLINE CONVERTER Public/Granted day:2013-05-02
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