Inverter having a broad output-control range

Details Inverter having a broad output-control range Inverter having a broad output-control range

1989-09-12

1991-07-30

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315DIG5, 315DIG7, 331177R, H05B 3702

Patent

active

050362542

ABSTRACT:
An inverter includes a DC voltage source for supplying a DC voltage. A switching transistor switches the DC voltage supplied from the DC voltage source. A parallel resonant circuit receives the DC voltage switched by the switching transistor and generates an AC output. A self-excited oscillator includes a detector for detecting at least part of the AC output from the resonant circuit for supplying the detection output between the base and emitter of the switching transistor so as to control the ON and OFF of the switching transistor and supplying a base current to the switching transistor. A variable impedance element includes a series circuit comprised of a variable resistance element and a capacitor for changing the resistance value of the variable resistance element, thereby to change the combined impedance value to change the ON period of the switching transistor. A control circuit continuously changes the resistance of the variable resistance element, thereby to change the impedance of the variable impedance element to continuously change the ON period of the switching transistor.

REFERENCES:
patent: 3681711 (1972-08-01), Hanby
patent: 3683266 (1972-08-01), Ito
patent: 4611150 (1986-09-01), Ball et al.
patent: 4745535 (1988-05-01), Sugishima et al.

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