| 摘要 |
PURPOSE:To suppress fluctuation in the output of a rectifying circuit, by detecting the magnitude of a received signal varying in correspondence to the coupling distance of electromagnetic induction coupling between units and increasing the coupling distance based on a detected output. CONSTITUTION:The level of a frequency signal induced in an induction coil 18 is the maximum when the length of gap l=0, and an output level regulating circuit 22 receives an output detected through a peak detecting circuit 20 and minimizes the output level for the induction coil 8. The output detected through the peak detecting circuit 20 drops when the length of gap l increases, and the output level regulating circuit 22 receives the detected peak output to produce an increased output voltage. Consequently, the frequency signal induced in an induction coil 9 through the induction coil 8 is maintained approximately constant regardless of the increase of the gap length l. As a result, output voltage from a rectifier circuit 10 can be maintained at a constant level when the gap length l increases. |
