| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the faulty connection and the like of a connecting terminal and enable the proper discharge of a secondary battery, by so constituting a power supply that the power supply can be detached from an external load, and supplying power to charge the secondary battery to the external load by electromagnetic induction. SOLUTION: The oscillation circuit section 4a of a power supply converts a direct-current voltage output from a secondary battery 3 into a sine-wave voltage V1 at approx. 100kHz, and outputs it to the primary coil 4c of the power supply. The secondary coil 5b of a portable terminal device 5 converts an electromagnetic wave input from the primary coil 4c of the power supply into a voltage by electromagnetic induction, boosts the voltage, and outputs the boosted voltage from the secondary coil 5b to a control circuit section 5c. The control circuit section 5c smoothes the input boosted voltage to generate a smoothed voltage V2, controls the smoothed voltage V2 and thereby obtains a stable output voltage. The control circuit section 5c then supplies this voltage to an external load 5a. Thereby the faulty connection of a connecting terminal is prevented and the secondary battery 3 is properly discharged.</p> |
