Systems and methods for controlling power converters

摘要

A non-isolated (transformerless) direct current-to-direct current (DC-DC) power supply includes a voltage converter module that converts DC input voltage having a first voltage level into a DC output having a second voltage level that is less than the first voltage level. An overvoltage protection module interposed between the input voltage source and the input to the DC-DC converter monitors the DC output and removes power from the voltage converter module if the DC output exceeds an overvoltage threshold. A second level of overvoltage protection that responds faster than the power disconnect module is provided within the DC-DC converter PWM controller, providing additional overvoltage protection to the DC-DC converter and preventing application of the input voltage to the converter output.

主权项

1. A method of controlling a power converter, comprising:
receiving a direct current (DC) voltage; converting the DC voltage to an output DC voltage, wherein the output DC voltage is lower than the input DC voltage; comparing the output DC voltage to first and second overvoltage thresholds, the first overvoltage threshold being less than the second overvoltage threshold; opening a power disconnect MOSFET if the DC output voltage exceeds the first overvoltage threshold; and opening a top magnetizing MOSFET if the DC output voltage exceeds the second overvoltage threshold.