Title:
【発明の名称】PWM制御による電源装置
Document Type and Number:
Japanese Patent JP2680345
Kind Code:
B2
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.
Inventors:
Hino Tsunetoshi
Application Number:
JP11054388A
Publication Date:
November 19, 1997
Filing Date:
May 09, 1988
Export Citation:
Assignee:
Toshiba Corporation
International Classes:
H02M5/458; H02M7/48; H02M7/5388; (IPC1-7): H02M7/48; H02M7/5387
Domestic Patent References:
| JP55127886A | ||||
| JP62140894U |
Attorney, Agent or Firm:
Hideaki Tokawa (1 outside)