Surge protection circuit, power supply device using same, and LED illumination device

A power supply device, wherein the power supply device is coupled to a power loop for a load in order to produce a driving signal, and comprising:

• a rectifying circuit configured to rectify an external driving signal to produce a rectified signal;
• an inductor, serially connected on the power loop and configured to receive and temporarily store surge energy in an external driving signal;
• a voltage-controlled component, connected in parallel with the inductor and configured to conduct electrical current to release the surge energy in response to a voltage across two ends of the inductor, thereby preventing the surge energy from affecting later-stage circuit(s), wherein
• the driving signal is obtained based on and after the external driving signal is processed through the inductor and voltage-controlled component;
• a driving module, comprising:
• a shock detection module connected in parallel between outputs of the rectifying circuit to detect a signal on the power loop and output a control signal according to the detection result;
• a driving circuit coupled to the shock detection module, and configured to determine whether to perform DC to DC voltage conversion based on the control signal.