发明名称 |
Common-mode current cancellation with digital pulses for isolated applications |
摘要 |
A mechanism for reducing common-mode current in a system including a first subsystem and an isolated subsystem. The isolated subsystem may receive the common-mode current from the first subsystem via an isolation mechanism. The isolation mechanism (e.g., a transformer) may isolate the isolated subsystem from the first subsystem by blocking DC signals. The first subsystem may include a pulse generation unit and compensation circuitry. The pulse generation unit may provide a first pulse and a second pulse to the compensation circuitry. The phase and duty cycle of the pulses may be varied based on measured characteristics of the isolation mechanism. The compensation circuitry may generate a cancellation signal based on the first and second pulses. Furthermore, the compensation circuitry may provide the cancellation signal to a ground plane of the isolated subsystem to reduce the common-mode current received at the isolation subsystem.
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申请公布号 |
US7324356(B2) |
申请公布日期 |
2008.01.29 |
申请号 |
US20050255705 |
申请日期 |
2005.10.21 |
申请人 |
NATIONAL INSTRUMENTS CORPORATION |
发明人 |
JOHNSTON LEE H. |
分类号 |
H02J1/02;H02M3/18;H02M3/335 |
主分类号 |
H02J1/02 |
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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