Non-transformer isolated DC-DC power supply including shut down circuit

摘要

A direct current-to-direct current (DC-DC) power supply includes a voltage converter module that converts an input voltage having a first voltage level into an output voltage having a second voltage level that is less than the first voltage level. An over-voltage detection module receives the second voltage and generates an over-voltage signal indicating an over-voltage condition of the DC-DC power supply. A shutdown module receives the over-voltage signal and generates a shutdown signal in response to the over-voltage condition. An over-voltage protection module interposed between the shutdown module and the input of the voltage converter module. The over-voltage protection module is configured to selectively inhibit delivery of the input voltage to the voltage converter module in response to the shutdown signal.

主权项

1. A direct current-to-direct current (DC-DC) power supply, comprising:
a voltage converter module including an input that receives a first voltage having a first voltage level and an output that provides a second voltage having a second voltage level that is less than the first voltage level, the voltage converter module further including a switching regulator that drives a voltage converting circuit that converts the first voltage level into the second voltage level; an over-voltage detection module configured to receive the second voltage from the voltage converter module and to generate an over-voltage signal indicating an over-voltage condition of the DC-DC power supply based on the second voltage; a shutdown module configured to receive the over-voltage signal and to generate a shutdown signal in response to the over-voltage condition; and an over-voltage protection module having an output terminal connected directly to the voltage converting circuit and first and second input terminals, the first input terminal connected to a power supply generating the first input voltage, and the second input terminal connected directly to only the output of the shutdown module so as the over-voltage protection module is interposed between the shutdown module and the input of the voltage converting circuit included in the voltage converter module such that the shut-down module is not directly connected to the switching regulator, the over-voltage protection module configured to selectively inhibit delivery of the input voltage to the voltage converter module in response to the shutdown signal, wherein the over-voltage protection module includes a controller in electrical communication with a protection unit, the protection unit selectively operable in an enabled mode and a disabled mode to control supply of the input voltage.