| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply circuit 10 capable of preventing a tuner 14 constituted of a digital circuit from having malfunction even if a power switch 12 is often turned on/off. SOLUTION: This power supply circuit comprises a load 15 which has a malfunction cause by supplied voltage fluctuating when it is below a prescribed voltage, a voltage conversion circuit 13 which converts the voltage of an external power supply 11 to the rated voltage of the load 15, a switch means 14 inserted between the voltage conversion circuit 13 and the load 15, and the power switch 12 which supplies the voltage of the external power supply 11 to the voltage conversion circuit 13. The voltage conversion circuit 13 is structured so that its output voltage may change corresponding to its time constant, and the switching means 14 is structured so as to open when inputted voltage is below the prescribed voltage. |
