Controlled frequency power factor correction circuit and method

Details Controlled frequency power factor correction circuit and method Controlled frequency power factor correction circuit and method

2005-11-29

2005-11-29

Patel, Rajnikant B. (Department: 2838)

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

C363S044000, C363S089000, C323S222000, C323S288000

Reexamination Certificate

active

06970365

ABSTRACT:
A power factor correction (PFC) circuit (10) includes a latch (16) having an output that initiates a coil current (ICOIL) in response to a transition edge of a clock signal (CLOCK) to generate a PFC signal (VOUT). An input receives a control signal (TERM). A current modulation circuit (14) has a first input (36) coupled for receiving the PFC signal to establish a charging time (TCH) of the coil current. A second input senses the coil current to establish a duty cycle of the coil current over a period of the clock signal, and an output (38) provides the control signal as a function of the charging time and the duty cycle.

REFERENCES:
patent: 5644214 (1997-07-01), Lee

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