The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 14, 2002
Filed:
Jan. 05, 2001
Hau-Jean Hsu, Tainan Hsien, TW;
Phoenixtec Power Co., Ltd., Taipei, TW;
Abstract
A constant-frequency active filter controlled by a peak current control mode, the constant-frequency active filter composes of a voltage step-up unit and a power factor corrector, wherein the power factor corrector is composed of a voltage control loop and a current control loop. The voltage step-up unit adjusts a waveform of an input current to a sine waveform. The voltage control loop has a microprocessor that provides a current command having the same phase with an input voltage to a PWM controller of the current control loop. The current control loop provides a sensing current induced from the input current to the PWM controller. The PWM controller receives the sensing current and the current command to control the input voltage and the input current to become the same phase so as to obtain a high power factor.