Common-mode current cancellation with digital pulses for...

Details Common-mode current cancellation with digital pulses for... Common-mode current cancellation with digital pulses for...

2008-01-29

2008-01-29

Nguyen, Matthew V. (Department: 2838)

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

C363S056060

Reexamination Certificate

active

11255705

ABSTRACT:
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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