Patent ID: 9651588
Date: 2017-05-16
CPC Classifications: G01R,G06F

Claim:
1. A power detecting circuit for a power supply module, the power detecting circuit comprising a current detecting module coupled to the power supply module and configured to detect an output current value thereof; a micro control unit (MCU) coupled to the current detecting module; a load coupled to the MCU; and a correcting circuit coupled to the MCU, the correcting circuit configured to correct the output current value of the power supply module when the load is turned off; wherein the MCU is configured to calculate an output power value of the power supply module according to a corrected output current value of the power supply module and a preset output voltage value or a tested output voltage value of the power supply module; the load displays the output power value; and the correcting circuit comprises a first transistor, a second transistor, and a third transistor; a base terminal of the first transistor is electrically coupled to the MCU via a first resistor, a collector terminal of the first transistor is electrically coupled to the current detecting module via a second resistor, and an emitter terminal of the first transistor is grounded; an emitter terminal of the second transistor is electrically coupled to the current detecting module, one terminal of a third resistor is electrically coupled to the current detecting module, and another terminal of the third resistor is electrically coupled to a base terminal of the second transistor via a fourth resistor, a collector terminal of the second transistor is electrically coupled to the load; one terminal of a fifth resistor is electrically coupled to the base terminal of the second transistor via the fourth resistor, and another terminal of the fifth resistor is electrically coupled to a collector terminal of the third transistor; and a base terminal of the third transistor is electrically coupled to the MCU via a sixth resistor, and an emitter of the third transistor is grounded.