Resonant switching apparatus using a cascode arrangement

Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits

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315397, H01J 2976

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active

046251553

ABSTRACT:
An apparatus for generating a periodic resonant pulse voltage across an inductance includes first and second switches coupled together in a series cascode arrangement. The cascode arrangement applies a first voltage to an inductance for storing energy therein. A periodic switching signal is coupled to the second switch. Each cycle of the switching signal includes a turn-on portion and a turn-off portion. The initiation of the turn-off portion makes the second switch nonconductive to enable the inductance and a resonating capacitance to form a resonant circuit that generates a resonant pulse voltage at a terminal of the resonant circuit. A damper switch is coupled to the inductance for terminating the generation of the resonant pulse voltage at the end of the first interval, prior to the initiation of the turn-on portion of the switching signal. The voltage at the resonant circuit terminal is coupled to the control electrode of the first switch for supplying current thereto during conduction of the damper switch. This enables the first switch to conduct current from the inductance during conduction of the second switch.

REFERENCES:
patent: 3559085 (1971-01-01), Ishijima
patent: 4215295 (1980-07-01), Inoue et al.
patent: 4242714 (1980-12-01), Yoshida et al.
patent: 4297621 (1981-10-01), Spilsbury
patent: 4464612 (1984-08-01), Teuling
patent: 4513228 (1985-04-01), Teuling
patent: 4556825 (1985-12-01), Thomas
An application note No. 946 entitled High Voltage, High Frequency Switching Using a Cascode Connection of HEXFET and Bipolar Transistor by S. Clemente, B. Pelly, R. Ruttonsha, B. Taylor published by International Rectifier Co.
An article that appears in Proceedings of Powercon 11 C1-4 submitted for Powercon conference that was held in Apr. 1984, and entitled, Analyzing the Switching Performance of the Emitter-Driven Power Transistor, the author is Tinus van de Wouw.

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