The present invention relates to a power circuit, which comprises a detection circuit. The detection circuit includes an abnormality detection circuit. The abnormality detection circuit is coupled to an input terminal or/and an output terminal of the power circuit. An input power is provided to the input terminal, and an output power is provided to the output terminal. The abnormality detection circuit controls the paths from a plurality of energy storage elements to the input terminal and the output terminal of the power circuit. The energy storage elements store the energy of the input power to generate the output power. The abnormality detection circuit detects the state of the input power or/and the output power, and cuts off the paths from a portion of the energy storage elements to the input terminal and the output terminal.