Patent ID: 8710804

Claim:
A power supply, comprising: a first signal detection circuit having an input terminal and an output terminal; a logic circuit having first and second input terminals and an output terminal, the first input terminal coupled to the output terminal of the first signal detection circuit; a second signal detection circuit having first and second input terminals and an output terminal, the first input terminal coupled for receiving a first reference signal and the output terminal coupled to the second input terminal of the logic circuit; a first current control element having first and second current carrying terminals and a control terminal, the second input terminal of the logic circuit coupled to the control terminal of the first current control element, the first current carrying terminal coupled to the input terminal of the first signal detection circuit; and a second current control element having first and second current carrying terminals and a control terminal, the control terminal coupled to the output terminal of the logic circuit and the first current carrying terminal coupled to the second current carrying terminal of the first current control element.