Power conversion circuit with limit power source and control method thereof

Abstract

A power conversion circuit includes: a path switch for controlling a conduction path of a supply voltage to a bus voltage; a first current sensing circuit for generating a current sensing voltage according to a current supplied to a load; a second current sensing circuit including the path switch or a conductive trace segment, configured to generate a determination voltage according to the current; and a power control circuit for executing a limit power source (LPS) control procedure according to the current sensing and the determination voltage. The LPS control procedure includes: a determination step for determining whether the current sensing voltage is lower than a sensing threshold and whether an absolute value of the determination voltage is higher than an absolute value of a determination threshold; and an LPS operation for limiting an output power related to the current. When determination result is true, the LPS operation is performed.

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