Power supply with digital feedback signaling

摘要

Apparatus and methods are provided for use with power supplies. A controller regulates power supply output by way of feedback signaling. Current pulses generated by an electrical load are detected in the feedback signaling and are processed to derive a sequence of digital bits. The digital bits are subjected to validity testing and decoded as digital data. Operations of the power supply are adjusted and requests for information are answered in accordance with the digital data.

主权项

1. Electronic circuitry configured to:
at an electrical power supply, sense current pulses generated by a load receiving electrical energy from the electrical power supply, the current pulses being generated by the load using modulated switching of a current being drawn by the load from the power supply; apply a moving average filter to the sensed current pulses generated by the load receiving electrical energy from the electrical power supply to derive a filtered signal; compare the filtered signal to a pair of threshold values to derive a digital bit stream of a message represented by the current pulses generated by the load; provide the digital bit stream to an asynchronous decoder state machine (ADSM) including a register and a bit counter, the ADSM loading the digital bit stream into the register and incrementing the bit counter in accordance with validity testing states; parse the contents of the register using the bit counter to derive digital data of the message; and adjust an operating parameter of the electrical power supply in accordance with the digital data of the message.