| 摘要 |
PROBLEM TO BE SOLVED: To provide a non-contact power supply unit capable of preventing the output voltage of a secondary unit from being under an overvoltage condition, by automatically controlling the output voltage of the secondary unit in response to fluctuations in the size of a load connected with the secondary unit. SOLUTION: A current it1 is separated into a current ic and a current it2. The current it2 flowing into a secondary winding of a transductor TR2 causes generation of a reverse electromotive force Vt2 in the secondary winding and the sum of the Vt2, and voltage Vc becomes output voltage on the secondary side of a coupling transformer 40. It a load connected with the secondary side of the coupling transformer 40 increases, the current it2 increases and the current it1 increases. As a result, the voltages Vt1, Vt2 of the transductor TR2 increase in proportion to a turn ratio. On the contrary, if the load decreases, the current it2 decreases and the it1 decreases, so that the voltages Vt1, Vt2 of the transductor TR2 decrease in proportion to the turn ratio. The output voltage on the secondary side is automatically controlled in response to fluctuations in the size of a load connected with the secondary side of the coupling trnasformer 40, thereby preventing the generation of overvoltage.
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