High-precision power supply based on direct-current resistance measurement and implementation method thereof

The invention discloses a high-precision power supply based on direct-current resistance measurement, and the power supply comprises a system power supply which is connected with power interfaces of an MCU system, a reference voltage generation circuit, a reference current generation circuit, a current gear switching circuit, a current sampling circuit, and a power amplification circuit. The invention further discloses an implementation method of the high-precision power supply based on direct-current resistance measurement. The implementation method comprises the steps of setting the function module, improving the EMI filter circuit unit, improving the PWM controller unit and the like. Closed-loop control is achieved through output sampling, the output current value is kept stable, and the direct-current resistance tester has the advantages of being high in precision (0.05%) and low in temperature drift, having five gears, being low in cost and the like, and can be used for most direct-current resistance tes