Patent ID: 8299813

Claim:
A system comprising: a switching power supply capable of being supplied with an alternating current power source; an electric load connected to the switching power supply; and a voltage regulation circuit, connected to the electric load, configured to output a linear voltage to the electric load while the switching power supply is undergoing an Over Current Protection (OCP) test; wherein the voltage regulation circuit comprises a micro controller unit (MCU) which is configured to output a Pulse Width Modulation (PWM) signal to a chip, a Digital/Analog Converter (DAC) circuit is connected to the chip, the chip is configured to transmit the PWM signal to the DAC circuit, the DAC circuit is configured to convert the PWM signal to an analog signal, the DAC circuit is configured to transmit the analog signal to the chip, one amplifier of the chip is configured to amplify the analog signal, and the amplifier is configured to supply an output voltage to the electric load according to the amplified analog signal.