| 摘要 |
<p>PURPOSE: To eliminate the effect of temperature variation by using the temperature variation as a function of a specific temperature for the AC current of the conductive material of an oscillation coil supplying a correction signal thereby making possible to use as a proximity detector. CONSTITUTION: The circuit comprises an AC current source of constant amplitude IB connected between first and second constant voltages M, VCC and the current flows through an oscillation circuit comprising a capacitance C and an inductance L corresponding to the coil of a proximity detector. When a DC current passes through series windings L, L', a DC current flows between the potential VCC and V1 . Substantially no AC current is present between the potential VCC and V1 when the DC current passes through series windings L, L', because of high coupling value between the windings L, L'. Consequently, the ends of the windings L, L' can be interconnected through an arbitrary capacitor C1 of appropriate value in order to avoid generation of any AC parasitic voltage. Variation of DC resistance in the windings L, L' can thereby be used for compensating for the temperature fluctuation of the signal on a terminal E.</p> |
