Patent ID: 7586340

Claim:
A driving apparatus configured for generating an adjustable driving current, comprising: an analog input generating circuit; an analog input driving circuit; and an output circuit; wherein the analog input generating circuit is electrically connected between a first voltage source and ground, and configured for providing an adjustable analog signal; the analog input driving circuit is electrically connected between a second voltage source and ground, and configured for converting the analog signal into a pulsed signal; the output circuit is configured for converting the pulsed signal into a driving current as an output, and the frequency of the pulsed signal can be adjusted via adjusting the analog signal and thereby varying the driving current; the second voltage source comprises a rectifier, the rectifier being configured for converting an alternating current (AC) voltage into a direct current (DC) voltage; and wherein the analog input generating circuit comprises a resistor R 1 and a variable resistor R e1 together connected between the first voltage source and ground, the resistor R 1 is electrically connected to the variable resistor R e1 together, in series, at a node, and the adjustable analog signal is supplied to the analog input driving circuit from the node.