Electronically controllable capacitors using power MOSFET's

Details Electronically controllable capacitors using power MOSFET's Electronically controllable capacitors using power MOSFET's

1994-06-27

1997-02-04

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Miscellaneous systems

For particular load device

307109, 361271, 361278, 361280, 361281, 257296, 257312, 315248, H01G 700

Patent

active

056001878

ABSTRACT:
An electrically controllable variable capacitor includes the interelectrode capacitance of at least one power MOSFET, a capacitance connected in series with the MOSFET and having one terminal connected to the drain or source thereof (the series capacitance), and bias control circuitry for controlling the bias voltage applied to the MOSFET. The voltage rating of the MOSFET, the peak amplitude of the applied ac signal, and the value of the series capacitance determine the range of dc bias voltages over which the MOSFET can be operated, and hence the capacitance range of the variable capacitor. Such a variable capacitance is useful as a tuning capacitor in an electrodeless HID lamp ballast.

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