发明名称 |
Electronically controllable capacitors using power MOSFET's |
摘要 |
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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申请公布号 |
US5600187(A) |
申请公布日期 |
1997.02.04 |
申请号 |
US19940265889 |
申请日期 |
1994.06.27 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
EL-HAMAMSY, SAYED-AMR;SCOTT, ROBERT S.;BOROWIEC, JOSEPH C. |
分类号 |
H01G7/00;H05B41/28;(IPC1-7):H01G7/00 |
主分类号 |
H01G7/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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