Isolated resistive current sensor

摘要

An isolated current-sensing system for use with a resistive current sense element includes an analog front-end configured to receive a voltage from the resistive current sense element, and to provide an analog output. A processing circuit receives the analog output, and provides a measurement signal indicative of the sensed current. An isolation circuit provides an isolation barrier, and is configured to pass the measurement signal. A programmable over-current protection alarm may be included, and configured to generate an alarm signal when the analog output exceeds a programmable threshold. The processing circuit may include a voltage-to-PWM converter.

主权项

1. An isolated current-sensing system for use with a resistive current sense element, the system comprising:
an analog front-end configured to receive a voltage from the resistive current sense element, and to provide an analog output; a programmable over-current protection alarm configured to receive a programming signal indicative of a threshold and receive the analog output, and configured to generate an alarm signal when the analog output exceeds the threshold; a processing circuit configured to receive the analog output, and to provide a measurement signal indicative of the sensed current; and an isolation circuit providing an isolation barrier, and configured to pass the programming signal, the alarm signal, and the measurement signal passing through the isolation barrier.