Power factor improving circuit

Details Power factor improving circuit Power factor improving circuit

1996-08-07

1998-04-14

Wong, Peter S.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 21, 363 37, 363 47, 323207, H02J 102

Patent

active

057400229

ABSTRACT:
A power factor improving circuit capable of obtaining a high power factor for a power supply circuit and at the same time of achieving a smaller size and lower cost of the power supply apparatus by a simple construction. To accomplish this object, a choke coil L1 is connected between the higher potential side output terminal of a rectifier 1 and the primary winding N1 of a transformer T of a converter circuit 2, and one end of a smoothing capacitor C1 is connected to a connecting point between the choke coil L1 and the primary winding N1 of the transformer T. The other end of the smoothing capacitor C1 is connected to the cathode of a first diode D1, to the anode of a second diode D2 and to the anode of a third diode D3. Connections are respectively made of the anode of the diode D1 to the lower potential side output terminal of the rectifier 1, the cathode of the diode D2 to a connecting point between the primary winding N1 and a switching transistor Q1, and the cathode of the diode D3 to a connecting point toward the rectifier 1 of the choke coil L1.

REFERENCES:
patent: 5581451 (1996-12-01), Ochiai

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