Abstract: A front-end circuit of a power converter has a power connection wiring detecting circuit, a power switch and a control unit. The power connection wiring detecting circuit is connected to an AC power. The control unit is connected to the power connection wiring detecting circuit. The power switch is connected to the power loop. The control unit turns on or off the AC power loop through the power switch. When the power connection wiring is correctly connected with the AC power, the control unit turns on the power switch and the front-end circuit outputs the AC power to the back-end circuit. When the power connection wiring is incorrectly connected with the AC power, the control unit turns off the power switch and the AC power is not outputted to the back-end circuit.

Abstract: A front-end circuit of a power converter has a power connection wiring detecting circuit, a power switch and a control unit. The power connection wiring detecting circuit is connected to an AC power. The control unit is connected to the power connection wiring detecting circuit. The power switch is connected to the power loop. The control unit turns on or off the AC power loop through the power switch. When the power connection wiring is correctly connected with the AC power, the control unit turns on the power switch and the front-end circuit outputs the AC power to the back-end circuit. When the power connection wiring is incorrectly connected with the AC power, the control unit turns off the power switch and the AC power is not outputted to the back-end circuit.

Abstract: An electronic device casing with a plug housing that has a housing, a plug and a recess. The plug has an electrical wire that connects the plug and the housing, and a connector that electrically connects to the electrical wire through the plug. The recess corresponds to the plug and the connector and has a magnet mounted on the recess where the connector may be stored. When the plug is stored in the recess, the magnet holds the connector. Consequently, the plug can be mounted easily and stably in the recess and removed from the recess without pulling and tugging the electrical wire. Thus the electrical wire will be less likely to have contact faults. Besides, the recess may have a simpler shape that reduces the production cost of the plug housing.