Title:
POWER FACTOR IMPROVING DEVICE
Document Type and Number:
Japanese Patent JP3829087
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent the problem of a conventional power factor improving device so constituted as to take in a full wave rectified voltage synchronized with an input voltage via a transformer, such that switching noise flows out via a transformer.
SOLUTION: The power factor improving device obtains an analogous waveform by inputting a signal synchronized with an AC power source into a multiplier, and makes its own input current waveform into a sine wave by zerocrossing the voltage difference between the voltage of the analogous waveform and that generated in a shunt resistance (s) connected in series to the load. The zerocross point of an AC power source is detected by a photocoupler PC, and based on the detection signal, a full wave rectification signal synchronized with the AC power source is generated. The generated full wave rectification signal is inputted to the above multiplier X.
Inventors:
Toshiaki Kanari
Mamoru Seo
Mamoru Seo
Application Number:
JP2001354367A
Publication Date:
October 04, 2006
Filing Date:
November 20, 2001
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
H02J3/18; H02M7/12; G06G7/16; H02M3/155; H02M7/219; (IPC1-7): H02M7/12; H02J3/18; H02M3/155; H02M7/219
Domestic Patent References:
| JP7087744A | ||||
| JP2001286149A | ||||
| JP2001045763A |
Attorney, Agent or Firm:
Aoyama Aoi
Osamu Kawamiya
Osamu Kawamiya
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