Now showing items 1-6 of 6
Zero-voltage-transition (ZVT) 3-phase PWM voltage link converters
(United States Patent and Trademark Office, 1996-11-12)
An improved zero voltage transition (ZVT) pulse width modulation (PWM) link converter is provided which introduces a space vector modulation scheme and an auxiliary circuit which includes a commutation power supply or ...
Discharge lamp driving circuit having resonant circuit defining two resonance modes
(United States Patent and Trademark Office, 1999-06-22)
An improved discharge lamp driving circuit of a charge-pump type capable of suppressing a ripple in an envelop of a lamp current at the time of dimming the lamp or at a low environmental temperature. The circuit includes ...
Soft-switching PWM converters
(United States Patent and Trademark Office, 1995-08-15)
A full-bridge zero-voltage-switching pulse-width-modulated converter employs a saturable reactor in place of the linear inductor in order to reduce current stress on the active switches, reduce voltage stress on the rectifier ...
Soft switched three-phase boost rectifiers and voltage source inverters
(United States Patent and Trademark Office, 1997-05-27)
A boost rectifier is provided with an ultra high speed diode in its direct current rail to reduce diode reverse recovery loss with or without implementing a soft switching technique. Full zero-voltage-transition (ZVT) as ...
Gas discharge lamp inverter with a wide input voltage range
(United States Patent and Trademark Office, 1999-09-07)
A gas discharge lamp driving circuit reduces input power at start-up mode through the utilization of input power diodes and stress capacitors in parallel therewith. The circuit includes a blocking filter for filtering an ...
Method and apparatus for automatic average current mode controlled power factor correction without input voltage sensing
(United States Patent and Trademark Office, 1999-07-06)
A method for preparing power factor control integrated circuits which generate linear pulse width modulation (PWM) waveforms is presented. The method of pulse width modulation waveform generation involves providing a ...