Duty cycle controlled switch variable capacitor circuit

Details Duty cycle controlled switch variable capacitor circuit Duty cycle controlled switch variable capacitor circuit

1996-01-31

1997-06-17

Sterrett, Jeffrey L.

Electricity: power supply or regulation systems

Output level responsive

Using an impedance as the final control device

323352, 323364, G05F 112

Patent

active

056400829

ABSTRACT:
A switch controlled variable capacitor circuit that includes a capacitor having a first terminal and a second terminal; a switch connected across the first and second terminals of the capacitor; a pulse width modulator for controlling the switch to close at positive going zero crossings of a sinusoidally varying current provided to the first and second terminals, and to open at D seconds after the positive going zero crossings, wherein D is in a range of 0.25 to 0.5 times the period T of the sinusoidally varying current; and a diode connected across the first and second terminal of the capacitor for conducting the sinusoidally varying current during a portion of a negative half of each period of the sinusoidally varying current. The switch variable capacitor circuit has a capacitance that is controlled by varying D.

REFERENCES:
patent: 3621377 (1971-11-01), Lim
patent: 3702405 (1972-11-01), Zwirn et al.
patent: 5399955 (1995-03-01), Glaser et al.
"Controlled Resonant Converters with Switching Frequency Fixed", Harada et al., IEEE Power Electronics Specialists Conference (PESC), Dec. 1987, pp. 431-438, IEEE Catalog No. 87CH2459-6.

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