| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a relay drive circuit capable of suppressing power consumption, and to provide a relay module using the same.SOLUTION: A relay drive circuit 1 comprises a regeneration diode 10 configuring a parallel circuit 4 together with a relay coil 21 included in an electromagnetic relay 2. The relay drive circuit 1 comprises: a current adjustment part 11 increasing and decreasing an input current from a DC power supply 3 to the parallel circuit 4; and a voltage detection part 13 detecting an input voltage from the DC power supply 3 as a detection voltage V0. A controller 12 turns off the current adjustment part 11 in a time period in which the detection voltage V0 is lower than a predetermined range, analog-controls the current adjustment part 11 in a time period in which the detection voltage V0 is in the predetermined range, and PWM-controls the current adjustment part 11 in a time period in which the detection voltage V0 is higher than the predetermined range.</p> |
