| 摘要 |
PROBLEM TO BE SOLVED: To prevent the breakage of a control circuit or a peripheral circuit in a DC-adapted device, even if the input polarity of DC power is erroneously connected to the circuit.SOLUTION: A DC control apparatus installed at an arbitrary device which operates by the DC power includes a wiring cord which is connected as a conveyance passage of the DC power, the control circuit which controls the device by the DC power conveyed via the wiring cord, and a polarity inversion part which is arranged between the terminal end of the wiring cord and the control circuit. The polarity inversion part includes an electric passage which is formed between lines for conveying the DC power to the control circuit and carries electricity when the polarity of the DC power is reversely connected thereto, a switch which replaces a conveyance contact point of the DC power by the current-carrying of the electric passage, and a polarity matching part which controls the operation of the switch. At electricity carrying of the electric passage, by replacing the conveyance contact point of the switch by the polarity matching part, the inverted polarity of the polarity of the DC power at the terminal end of the wiring cord is set as the polarity of the control circuit. |
