Abstract: A protection circuit including an auxiliary winding, a rectifier unit, the filter unit, a voltage divider unit and a controller is provided. The auxiliary winding is configured to induce an AC voltage. The rectifier unit is coupled to the auxiliary winding and configured to rectify the AC voltage into a DC voltage. The filter unit is coupled to the rectifier unit and configured to filter the DC voltage into a DC filter voltage. The voltage divider unit is coupled to the rectifier unit and the filter unit to transmit the DC filter voltage. The controller is coupled to the voltage divider unit and configured to detect a partial voltage of the DC filter voltage and detect whether to activate a protection mechanism according to the partial voltage.

Abstract: A protection circuit including an auxiliary winding, a rectifier unit, the filter unit, a voltage divider unit and a controller is provided. The auxiliary winding is configured to induce an AC voltage. The rectifier unit is coupled to the auxiliary winding and configured to rectify the AC voltage into a DC voltage. The filter unit is coupled to the rectifier unit and configured to filter the DC voltage into a DC filter voltage. The voltage divider unit is coupled to the rectifier unit and the filter unit to transmit the DC filter voltage. The controller is coupled to the voltage divider unit and configured to detect a partial voltage of the DC filter voltage and detect whether to activate a protection mechanism according to the partial voltage.

Abstract: A power transformer including at least one primary side conductive piece, at least one secondary side conductive piece, a first conductive strip pin, a second conductive strip pin and an iron core set is provided. The at least one secondary side conductive piece is stacked to the at least one primary side conductive piece along an axis. The first conductive strip pin and the second conductive strip pin extend from the at least one secondary side conductive piece, and are bent and extend along the axis. The iron core set is coupled to the at least one primary side conductive piece and the at least one secondary side conductive piece. A circuit board module is further provided.

Abstract: A power transformer including at least one primary side conductive piece, at least one secondary side conductive piece, a first conductive strip pin, a second conductive strip pin and an iron core set is provided. The at least one secondary side conductive piece is stacked to the at least one primary side conductive piece along an axis. The first conductive strip pin and the second conductive strip pin extend from the at least one secondary side conductive piece, and are bent and extend along the axis. The iron core set is coupled to the at least one primary side conductive piece and the at least one secondary side conductive piece. A circuit board module is further provided.

Abstract: The present disclosure provides a power saving device with power supply, comprising a charger power circuit, a receptacle, a plug detection unit, an ON/OFF control circuit and a power output enable circuit. The plug detection unit uses a mechanical or electrical detection apparatus to detect whether a plug-in device is inserted or not. When there is no plug-in device in the receptacle, the power output enable circuit will cut off the power to the charger power circuit. So the power consumption of the power saving device is reduced while no plug-in device is inserted into the receptacle.