Patent ID: 7573316

Claim:
A control apparatus, comprising: a voltage source; a controlling unit, coupled to the voltage source for receiving an input signal and generating an output signal wherein the controlling unit comprises: a first resistor, a first terminal of the first resistor coupled to the voltage source; a first transistor, a drain of the first transistor coupled to a second terminal of the first resistor and a gate of the first transistor coupled to the voltage source; a second transistor, a drain of the second transistor coupled to a source of the first transistor, a source of the second transistor coupled to a drain of a third transistor and a gate of the second transistor for receiving the input signal; and a first output terminal, coupled between the first resistor and the drain of the first transistor for generating the output signal; and an enabling unit, coupled to the voltage source, the controlling unit and a ground terminal for controlling whether or not the controlling unit generates the output signal according to an enabling signal, wherein the enabling unit comprises: a first switch, a first terminal of the first switch coupled to the voltage source for selectively turning on or turning off according to the enabling signal; a second resistor, a first terminal of the second resistor coupled to a second terminal of the first switch; a third resistor, a first terminal of the third resistor coupled to a second terminal of the second resistor and a second terminal of the third resistor coupled to the ground terminal; and the third transistor, a source of the third transistor coupled to the ground terminal and a gate of the third transistor coupled between the second and the third resistor.