Power supply device and operation method thereof

A power supply device, comprising:

• a switch;
• a first inductor coupled to the switch, being configured to receive an output voltage from a voltage signal converter and to generate an energy storage voltage;
• a power supply coupled to the switch, being configured to provide a supply voltage;
• an energy storage element coupled to the switch at a first voltage output terminal;
• a first surge suppressor coupled to the energy storage element at a node;
• and
• a second surge suppressor, a first terminal of the second surge suppressor being coupled to the energy storage element at the node;
• wherein the first surge suppressor is electrically coupled to, through a second terminal of the second surge suppressor, the power supply at a second voltage output terminal;
• wherein when the switch is switched to be turned on, the power supply, the energy storage element, the switch, and the first surge suppressor form a first loop in order to absorb a reverse surge generated while the switch is switched, and the power supply is further configured to output the supply voltage between the first voltage output terminal and the second voltage output terminal;
• wherein when the switch is switched to be turned off, the energy storage element and the second surge suppressor form a second loop to absorb a forward surge generated while the switch is switched, and the first inductor is further configured to output the energy storage voltage between the first voltage output terminal and the second voltage output terminal.

An operation method of a power supply device, comprising:

• by an inductor, absorbing an output voltage of a voltage signal convertor to output a first voltage signal;
• and
• controlling a turn-on state of a switch to selectively output the first voltage signal as an output voltage, or output from an adjustable power supply a second voltage signal as the output voltage, a polarity of the second voltage signal being opposite to the first voltage signal;
• wherein when the switch is turned off, an energy storage element and a first surge suppressor are configured to form a first loop to suppress a reverse surge generated while outputting the first voltage signal;
• when the switch is turned on, the energy storage element, the switch and a second surge suppressor are configured to form a second loop to suppress a forward surge while outputting the second voltage signal.