Abstract: A multifunctional electrical power output protection device includes a protection device having a circuit board. The circuit board is mounted in a receiving space of the protection device and includes an input port, an output port, a switching element, a detection element, and a manually-operating overriding device. The manually-operating overriding device is electrically connected to an end of the detection element. The switching element has an end electrically connected to the input port and an opposite end electrically connected to the output port. The detection element has an end electrically connected to the input port and an opposite end electrically connected to the output port. The switching element and the detection element that are connectable to an external power supply respectively provide an effect of preventing backward charging induced by a reverse electrical current and effects of over-loading interruption and current-limiting protection.

Abstract: The portable power supply contains a circuit unit and a rechargeable battery. The circuit unit contains a conversion circuit, an AC output port, a DC input/output port, and a coupling port. The rechargeable battery is coupled to the coupling port. The DC electricity stored in the rechargeable battery is delivered to the circuit unit through the coupling port, and then to a first branch and a second branch. Following the first branch, the DC electricity is transformed a pre-determined AC voltage by the conversion circuit, and the AC voltage is delivered to an external electronic device through the AC output port. Following the second branch, the DC electricity is directly delivered to another external electronic device through the DC input/output port. Without connecting the external electronic device, the DC input/output port is capable of connecting to an external DC power source for charging the rechargeable battery.

Abstract: The portable power supply contains at least a first battery, at least a second battery, at least a first switch element, at least a second switch element, a plurality of charging and regulating circuits, an input interface element, and an output interface element. Each second battery is electrically connected in series with a first battery through a first switch element. Each second switch element is electrically connected in-series between ground and a first battery or a second battery. Each charging and regulating circuit is electrically connected to a first battery or a second battery The input interface element has an end electrically connected to an external power source, and another end electrically connected to all charging and regulating circuits. The output interface element has an end electrically connected to an external electronic device, and another end electrically connected to a first battery or a second battery.