Three-phase power supply circuit

According to the three-phase power supply circuit, a three-phase alternating current input end of a power supply rectification module is connected with a three-phase power supply, and positive and negative direct current output ends are connected in parallel with a first capacitor and a second capacitor which are connected in series; two ends of the first capacitor are connected in parallel with the first voltage-sharing resistor, the first sampling resistor and the first voltage-dividing resistor after series connection; two ends of the second capacitor are connected in parallel with a second equalizing resistor; equivalent resistance values of parallel resistors at two ends of the first and second capacitors are equal; the control module controls the power rectification module based on the voltage of the sampling resistor, so that voltages at two ends of the two capacitors are equal. Thus, equivalent resistance values at two ends of the first capacitor and the second capacitor of the three-phase power suppl