Vrms and rectified current sense full-bridge...

Details Vrms and rectified current sense full-bridge... Vrms and rectified current sense full-bridge...

2007-09-11

2007-09-11

Patel, Rajnikant B. (Department: 2838)

Electric power conversion systems

Current conversion

Having plural converters for single conversion

C363S081000

Reexamination Certificate

active

11224167

ABSTRACT:
A synchronous full bridge rectifier is controlled to provide a power factor near unity. The full bridge rectifiers are transistors each with a controlling input. The AC input signal and currents within the circuit are sensed and sent to a controller. In response, the controller output control signals to turn on/off the rectifying MOSFETS on a timely basis to form a power factor of near one with respect to the AC input signal. The full wave rectifier is made of N-channel MOSFET's, some with fast body diodes. The MOSFET's are rectifiers and PFC control elements. The result is a one stage synchronous rectifier with PFC. A solid state precision analog differential amplifier senses the AC line waveform and high frequency current transformers sense the currents. The controller accepts the inputs of the amplifier and the sensed currents and outputs control signals that turn on and off the four MOSFET's. The timing of turning on/off is arranged so that the current drawn from the AC source is sinusoidal and matches the phase of the sinusoidal AC source.

REFERENCES:
patent: 4449176 (1984-05-01), Turnbull
patent: 6411535 (2002-06-01), Roux
patent: 6738274 (2004-05-01), Prasad et al.

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