Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
June 26, 2007
Patent Application Number
11297352
Date Filed
December 9, 2005
Patent Primary Examiner
Patent abstract
The present invention discloses an improved passive power filter circuit, wherein a rated compensating voltage is provided for the power factor compensating circuit in order to solve the problem of instable power output resulting from that the rated voltage is obtained via bypassing the standby power supply circuit in the conventional technology. Further, in the present invention, a circuit is used to pre-charge two filter capacitors, which are coupled to the DC output terminals of a rectifier, in order to offset the current phase advance or the current phase lag, which the conventional passive power filter circuit cannot solve, and thereby, the power factor is improved.
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