Inverter capable of controlling operating frequency

Details Inverter capable of controlling operating frequency Inverter capable of controlling operating frequency

1988-12-14

1991-02-12

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, 315307, 315283, 363 97, 363131, H05B 3702, H05B 3904, H02M 324

Patent

active

049927027

ABSTRACT:
An inverter is made up of a parallel circuit as a voltage resonance circuit, and a first diode, which are connected in series between both ends of a power source. The parallel resonance circuit includes the primary winding of an output transformer of the leakage type, and a resonance capacitor. The first diode is connected at the cathode to the primary winding of the output transformer. The secondary winding of the output transformer is coupled with a load such as a discharge lamp. The cathode and anode of the first diode are respectively connected to the collector and emitter of a transistor. A series circuit of a second diode and capacitor is connected across the collector-emitter path of the transistor. The second diode is forwardly arranged with respect to the transistor. A voltage detector comprises the capacitor and two resistors which are connected in series, and connected across the capacitor. The output voltage is derived from the node of those resistors. An error amplifier compares the output voltage of the voltage detector and an output voltage from a reference voltage source. A VCO oscillates at a switching frequency based on the comparison result. The oscillation output signal is applied to the base of the transistor.

REFERENCES:
patent: 3746921 (1973-07-01), Marshall et al.
patent: 4228382 (1980-10-01), Virtanen
patent: 4488210 (1984-12-01), Shono
patent: 4513226 (1985-04-01), Josephson
patent: 4686427 (1987-08-01), Burke
patent: 4700113 (1987-10-01), Stupp et al.
"IEEE Standard Dictionary of Electrical and Electronic Terms" Third Edition Jul. 20, 1984.

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