发明名称 |
Low leakage, solid state a-c power contact |
摘要 |
A power contact with low off current for switching a-c loads in response to a logic signal includes a rectifier bridge circuit in a series with the load and the a-c power source, a MOSFET connected across the d-c terminals of the bridge, and a series RC filter circuit in parallel with the MOSFET. A metal oxide varistor connected across the d-c side of the bridge protects the MOSFET from transients in the a-c circuit. While this power contact is capable of switching sizable a-c currents, the leakage current with the MOSFET off is less than 1/10 of a milliamp so that it can also be used to switch loads which draw very low level currents. The MOSFET is electrically isolated from the logic signal by an opto-isolator which has a unique switchable output which permits the power contact to be readily adapted for use with normally energized or normally deenergized loads.
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申请公布号 |
US4691263(A) |
申请公布日期 |
1987.09.01 |
申请号 |
US19850809710 |
申请日期 |
1985.12.17 |
申请人 |
WESTINGHOUSE ELECTRIC CORP. |
发明人 |
KENNY, THOMAS J.;SUTHERLAND, JAMES F. |
分类号 |
H02H9/02;H03K17/0814;H03K17/785;(IPC1-7):H02H3/08 |
主分类号 |
H02H9/02 |
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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