Converter device having power factor improving circuit

Details Converter device having power factor improving circuit Converter device having power factor improving circuit

2005-07-12

2005-07-12

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Phase controlled switching using electronic tube or a three...

C323S246000, C323S283000, C323S300000

Reexamination Certificate

active

06917185

ABSTRACT:
A converter device is provided which has a power factor improving circuit that removes effects of noise superimposed on an AC power supply and reduces higher harmonics and improves the power factor. A power factor improving circuit (103) generally includes a voltage error amplifier (8), a current error amplifier (10), a comparator (11), a triangular wave oscillator (12), an output buffer (13), and a DC power supply (PS). A power factor improving unit (102) has a photocoupler (14) for detecting an output of an AC power supply (1) and a microcomputer (15), where the output (Vp) of the photocoupler (14) is given to the MCU of the microcomputer (15). A D/A converter (17) in the microcomputer (15) gives a converter output (DAO) to the power factor improving circuit (103) and the power factor improving circuit (103) gives a reference voltage (VREF) to the D/A converter (17).

REFERENCES:
patent: 5932938 (1999-08-01), Shimamori
patent: 6037757 (2000-03-01), Oliveira et al.
patent: 07-213066 (1995-08-01), None
patent: 09-252578 (1997-09-01), None
patent: 2001-045763 (2001-02-01), None
patent: 2001-238452 (2001-08-01), None

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