PWM-controlled power supply capable of eliminating modulation-fr

Details PWM-controlled power supply capable of eliminating modulation-fr PWM-controlled power supply capable of eliminating modulation-fr

1989-05-09

1990-06-19

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

363 41, 363 98, H02M 5451

Patent

active

049348221

ABSTRACT:
In a PWM control type power supply apparatus, there are provided a single-phase full-wave rectifier coupled to a power source having a low frequency, for rectifying a first AC (alternating current) voltage to produce a DC (direct current) voltage; a DC-to-AC inverter including a first pair of switching elements connected to an input terminal thereof, and a second pair of switching elements connected to an output terminal thereof and to the first pair of switching elements to constitute a bridge inverter circuit, for inverting the DC voltage into a second AC voltage to be applied to a load; and a switching controller connected to the DC/AC inverter for alternately turning ON/OFF the second pair of switching elements in response to a sync signal (SYC) in synchronism with the first AC voltage at the low frequency of the power source, and for alternately turning ON/OFF the first pair of switching elements in response to a PWM (pulse-width modulation) control signal obtained from the first AC voltage and the second AC voltage, in a PWM control mode at a high-frequency higher than the low frequency of the power source, whereby a phase of the second AC voltage is opposite to that of the first AC voltage.

REFERENCES:
patent: 3710222 (1973-01-01), Jessee
patent: 3958171 (1976-05-01), Sekino
Makino, et al., "New Power Supply System for Air Conditioner Using Bidirectional Current Controlled Converter", pp. 457-462, 9/1988.

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