Abstract: A surge protection device has a pulse controlled switch, a pulse generation circuit and an abnormal voltage detection circuit. The surge control switch is connected in series to a power line loop and has at least one control terminal respectively connected to output terminals of the pulse generation circuit and the abnormal voltage detection circuit. An output terminal of the abnormal voltage detection circuit is connected to the power line loop and is located in the back end of the pulse controlled switch. The pulse generation circuit serves to send a pulse to the pulse controlled switch to close the pulse controlled switch and connect to the power line loop. When continuously detecting abnormal voltage in the power line loop, the abnormal voltage detection circuit opens the pulse controlled switch and disconnects from the power line loop so as to protect back-end equipment or circuit.

Abstract: A surge protection device has a pulse controlled switch, a pulse generation circuit and an abnormal voltage detection circuit. The surge control switch is connected in series to a power line loop and has at least one control terminal respectively connected to output terminals of the pulse generation circuit and the abnormal voltage detection circuit. An output terminal of the abnormal voltage detection circuit is connected to the power line loop and is located in the back end of the pulse controlled switch. The pulse generation circuit serves to send a pulse to the pulse controlled switch to close the pulse controlled switch and connect to the power line loop. When continuously detecting abnormal voltage in the power line loop, the abnormal voltage detection circuit opens the pulse controlled switch and disconnects from the power line loop so as to protect back-end equipment or circuit.

Abstract: A power converter having a pivotable and receivable power plug has a housing, an adapter board, a power output unit and a plug. The adapter board and the power output unit are mounted inside the housing. The adapter board has two conducting strips and a grounding strip. Each conducting strip has a shaft holder formed by bending a free end of the conducting strip, and two metal pivot shafts formed on two opposite sides of the plug are pivotally and respectively mounted in the shaft holders. The plug has a ground plate having a first engagement portion formed thereon. The grounding strip has a second engagement portion formed therein in a pivoting path of the plug to engage the first engagement portion and position the plug when the plug is pivoted and protrudes beyond the housing. Accordingly, the power converter can have a pivotable and receivable plug with minimum parts.