Switching device and method for controlling the switching device

A switching device, comprising:

• a coil, a first switch and a second switch;
• wherein a first end of the first switch is connected to a high potential end of an input power source and a second end of the first switch is connected to a first end of the coil;
• a second end of the coil is connected to a first end of the second switch and a second end of the second switch is connected to a low potential end of the input power source;
• the switching device further comprises:
• a first diode, the anode of the first diode being connected to the second end of the coil and the cathode of the first diode being connected to the high potential end;
• a second diode, the anode of the second diode being connected to the low potential end and the cathode of the second diode being connected to the first end of the coil;
• a first power supply unit, a first end of the first power supply unit being connected to the second end of the coil, a second end of the first power supply unit being connected to the low potential end, and an output of the first power supply unit outputting a first supply voltage;
• a first energy-consuming unit, the first energy-consuming unit being connected between the second end of the second switch and the low potential end;
• a second energy-consuming unit, the second energy-consuming unit being connected between the high potential end and the low potential end;
• a voltage detection unit, which is configured to detect an input voltage of the input power source and to feed a voltage detection signal to a control unit;
• and
• the control unit, which is configured to control the switching on and off of the first switch and to control the switching on and off of the second switch within a time period during which the first switch is switched off in response to the input voltage being greater than a pre-given voltage threshold;
• wherein the first supply voltage is less than the input voltage.