Wide input power supply circuit

The utility model provides a wide-input power supply circuit which comprises a first switch tube, a first diode, an inductance coil, a second switch tube, a second diode and a first capacitor which form a double-tube Buck-Boost circuit. The first resistor, the second resistor, the third resistor, the fourth resistor, the reference voltage output unit, the voltage regulator, the comparison unit, the first driving unit, the second driving unit and the current transformer form a control circuit, and the rectification unit is connected with the double-tube Buck-Boost circuit and the control circuit. According to the scheme, the boost and buck functions can be realized through the double-tube Buck-Boost circuit, and normal use of industrial equipment can be realized when single-phase power and three-phase power are input. In addition, the rectification unit and the control circuit are used, so that the double-tube Buck-Boost circuit can output constant voltage, and the operation safety of industrial equipment is i