Patent ID: 7626583

Claim:
A voltage detection circuit coupled between a first and second circuit boards, the first circuit board having a first shorting line, the second circuit board having second and third shorting lines, the voltage detection circuit comprising: a first connection unit comprising: a first dummy line, wherein one terminal of the first dummy line is coupled to the first circuit board to receive a first voltage, and the other terminal of the first dummy line is coupled to one terminal of the second shorting line; and a second dummy line, wherein one terminal of the second dummy line is coupled to one terminal of the first shorting line, and the other terminal of the second dummy line is coupled to the other terminal of the second shorting line; a second connection unit comprising: a third dummy line, wherein one terminal of the third dummy line is coupled to the other terminal of the first shorting line, and the other terminal of the third dummy line is coupled to one terminal of the third shorting line; and a fourth dummy line having a first terminal and a second terminal, wherein the first terminal is coupled to the first circuit board, and the second terminal is coupled to the other terminal of the third shorting line; a resistor having two terminals, wherein one terminal of the resistor is coupled to the first terminal, and the other terminal thereof receives a second voltage; and a voltage detection unit for detecting a voltage of the first terminal and outputting a control signal, wherein the voltage detection unit enables the control signal when the voltage of the first terminal is less than a predetermined value.