Charge limited high voltage switch circuits

Details Charge limited high voltage switch circuits Charge limited high voltage switch circuits

2007-04-19

2008-11-11

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

C315S225000, C315S291000

Reexamination Certificate

active

07449841

ABSTRACT:
High voltage switches are configured with a junction transistor driven with a transformer coupled AC drive signal in the common base configuration or driven by a capacitor coupled charge pump. The high voltage switches may be configured as half wave or full wave switches wherein the junction transistor is driven during one or both half cycles of the AC drive signal. Bipolar switches that can stand off high DC voltage of either polarity, or that can stand off high AC voltage, are configured from two junction transistors with their bases connected and their emitters connected. These switches may also be driven in full wave or half wave mode, by a transformer or by single or dual capacitive charge pumps. Either NPN or PNP transistors may be used. Example drive circuits, which can be constructed as low voltage integrated circuits, are given for all of the switch types.

REFERENCES:
patent: 4342956 (1982-08-01), Archer
patent: 4430608 (1984-02-01), Nesler
patent: 5502357 (1996-03-01), Kimball
patent: 5907238 (1999-05-01), Owerko et al.
patent: 6847175 (2005-01-01), Nerone
patent: 7015654 (2006-03-01), Kuhlmann et al.

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