Voltage regulation circuit

The utility model discloses a voltage regulation circuit which is externally connected with an alternating current power supply and a load. The voltage regulation circuit comprises a breaker, a first resistor, a second resistor, an adjustable resistor, a first IGBT, a second IGBT and a diode, wherein the alternating current power supply, the breaker, the first resistor, the adjustable resistor, the second resistor and the diode are combined to form a loop; a collector electrode of the first IGBT is connected with the connecting end of the breaker and the first resistor, and a base electrode of the first IGBT is connected with the connecting end of the first resistor and the adjustable resistor; a collector electrode of the second IGBT is connected with the connecting end of the second resistor and the diode, and a base electrode of the second IGBT is connected with the connecting end of the adjustable resistor and the second resistor; one end of the load is connected with an emitting electrode of the first IGBT, and the other end of the load is connected with an emitting electrode of the second IGBT. According to the voltage regulation circuit, load voltage is regulated by regulating the value of resistance.