| 摘要 |
PROBLEM TO BE SOLVED: To provide a power circuit having three-terminal regulator with high conversion efficiency of electric energy.SOLUTION: The power circuit having three-terminal regulator is equipped with: a power input port; a power output port; a three-terminal regulator including an input port and an output port; a voltage regulating circuit including a first terminal connected to the power input port, a second terminal connected to the input port of the three-terminal regulator, and a third terminal connected to the power output port; and a charge/discharge circuit connected to the power output port to which are also connected the output port of the three-terminal regulator and the third terminal of the voltage regulating circuit. When the power circuit is connected to a power supply, a current supplied by the power supply flows in the voltage regulating circuit and in the three-terminal regulator, and then charges the charge/discharge circuit. The three-terminal regulator detects a voltage value of the charge/discharge circuit, and if the voltage value of the charge/discharge circuit reaches a predetermined voltage value, the three-terminal regulator disables the input port. The voltage regulating circuit and the charge/discharge circuit supply power to an electronic device. |
