SWITCH-MODE POWER SUPPLY WITH TEMPERATURE AND CURRENT SHARING

摘要

A switched-mode power supply in a set of parallel-connected switched-mode power supplies is operated to (1) monitor both output current and operating temperature, and (2) auto-tune an output voltage using two-dimensional control that employs a two-dimensional function of the output current and the operating temperature. The two-dimensional function is a sharing function whose use in each of the supplies effects a coordinated sharing of both load current and operating temperature across the set of supplies. Temperature sharing includes monitoring and controlling distribution of operating temperatures across the set of supplies to reduce undesirable temperature imbalance that can cause excessive thermal stress and reduce reliability.

主权项

1. A switched-mode power supply for use as one of a set of parallel-connected switched-mode power supplies having respective outputs connected together to provide power to a load, comprising:
power circuitry operative to generate output power at an output, the output power including an output voltage and an output current; monitoring circuitry operative to monitor both output current and operating temperature of the switched-mode power supply; and control circuitry operative to auto-tune the output voltage of the switched-mode power supply using two-dimensional control, the two-dimensional control employing a predetermined two-dimensional function of the output current and the operating temperature to vary a duty cycle of operation of the switched-mode power supply to achieve the auto-tuning of the output voltage, the two-dimensional function being a sharing function whose use in each of the set of parallel-connected switched-mode power supplies effects a coordinated sharing of the load current and operating temperature across the set of parallel-connected switched-mode power supplies.