Paralleled current sharing technology-based switching power supply circuit

The invention provides a paralleled current sharing technology-based switching power supply circuit, which comprises a three-phase rectifier and filter circuit and a plurality of paralleled voltage-stabilized sources, wherein the three-phase rectifier and filter circuit comprises a three-phase full-bridge rectifier circuit and a capacitance filter circuit and is connected with a mud turbine generator; and each voltage-stabilized source comprises a fly-back transformer, a high-frequency rectifier and filter circuit, a sampling feedback circuit, a pulse-width modulation (PWM) control circuit and a current sharing circuit. The paralleled current sharing technology-based switching power supply circuit provided by the invention has the effects that the switching power supply circuit can be applied to a power supply system of an intelligent drilling tool employing an electronic control unit; stable direct-current electric energy is provided; the problems that a single switching power supply circuit is relatively low in output power and difficult to meet the high-power load requirements, and a plurality of switching power supply circuits are unbalanced in operation load during parallel connection are solved; the capacity of the intelligent drilling tool for carrying with the load is enhanced; the stability during operation is improved; and the service life during operation is prolonged.