Power supply circuit and powered device

Abstract

The application relates to a power supply circuit and a power consumption device. The power supply circuit comprises an input selection circuit, a voltage conversion circuit and an adaptive selection circuit. The input selection circuit is used for disconnecting the output of the first direct current when the first direct current is greater than a first voltage value, so as to protect the subsequent stage from being damaged. The voltage conversion circuit converts the first direct current into second direct current of the first voltage value and outputs the second direct current. The adaptive selection circuit is used for outputting the first direct current to an output port when the first direct current is greater than a second voltage value, and outputting the second direct current to the output port when the first direct current is less than the second voltage value. Stable voltage can be output to the load within the input voltage range between the first voltage value and the second voltage value, and when the input voltage exceeds the first voltage value, the circuit itself has a voltage cutting function, so that the subsequent stage can be protected from being damaged by high voltage. The circuit is simple and reliable, and low in cost.

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