Patent ID: 8456181
Filing Date: 2013-06-04
Classification: G01K,H02H

Abstract:
1. A measurement circuit for a power supply, the measurement circuit comprising: a switch unit comprising a plurality of keys, wherein the plurality of keys are selectively pressed to output different resistance regulating signals; a control circuit; a resistance setting circuit to receive the resistance regulating signals from the switch unit and connect different resistances to the control circuit according to received resistance regulating signals; wherein the control circuit obtains a voltage according to the chosen resistance by the resistance setting circuit and compares the voltage with a preset voltage, upon a condition that the voltage is greater than the preset voltage, the control circuit outputs a high level signal to a control pin of a pulse width modulation (PWM) controller, to control a voltage unit to output a voltage, upon a condition that the voltage is less than the preset voltage, the control circuit outputs a low level signal to the control pin of the PWM controller, to control the voltage unit to not output a voltage; and a display unit to display the chosen resistance.