| 摘要 |
<p>Provided is a heat-generation inhibiting circuit for a relay circuit, with which it is possible to reduce the amount of heat generated by the exciting coil during operation of the relay circuit. The disclosed heat-generation inhibiting circuit includes: a resistor (R1) provided between the exciting coil (Xc) and the ground; and a diode (D1) provided between the point (p1) and the point (p2). Immediately after the switch (SW1) has been turned on and before the relay contact (Xa) is closed, the exciting current (Ia) flows toward the ground via the diode (D1), and thus the voltage applied to the exciting coil becomes substantially equal to the power supply voltage (VB) and the relay contact can be closed reliably. When the relay contact (Xa) is closed, the exciting current (Ia) flows toward the ground via the resistor (R1), and thus the voltage applied to the exciting coil (Xc) is decreased and the amount of heat generated can be reduced.</p> |
