Repoling driving device and driving method thereof

A repoling driving device, coupled to a piezoelectric element, comprising:

• a piezoelectric driver coupled to the piezoelectric element;
• a processor coupled to the piezoelectric driver and configured to control the piezoelectric driver to generate a driving voltage, wherein the piezoelectric element is configured to receive the driving voltage to generate an output current;
• and
• a current detector coupled to the piezoelectric element and the processor and configured to receive the output current, wherein when the output current is less than a given current, the current detector generates a repoling signal and transmits the repoling signal to the processor, and the processor controls the piezoelectric driver to repolarize the piezoelectric element in response to the repoling signal,
• wherein the piezoelectric driver comprises:
• a driving circuit coupled to the processor, wherein the processor is configured to control the driving circuit to generate the driving voltage,
• a repoling circuit coupled to the processor, wherein the processor is configured to control the repoling circuit to generate a repoling voltage in response to the repoling signal, and
• a selector coupled to the piezoelectric element, the processor, the driving circuit, and the repoling circuit, wherein the processor is configured to control the selector to select the driving voltage or the repoling voltage, and the selector is configured to apply the driving voltage to the piezoelectric element to generate the output current or to apply the repoling voltage to the piezoelectric element to repolarize the piezoelectric element.