Driving device

A driving device drives a working device with a parasitic capacitor, and includes a power unit, a first switching unit, an energy storage unit, a second switching unit and a control unit. The power unit outputs a power signal. The first switching unit receives the power signal. The energy storage unit outputs a driving signal driving the working device according to the power signal. The control unit outputs a first PWM signal to control the first switching unit, and outputs the second PWM signal to control the second switching unit. The first PWM signal and the second PWM signal have opposite voltage levels at the same time point. During a buck period, energy stored in the parasitic capacitor releases to the power unit by the first switching unit, and energy stored in the parasitic capacitor releases to the energy storage unit by the second switching unit.