WE CLAIM :
1. An elevator control apparatus, comprising:
a DC-DC converter (32) comprising a first switching element (46) and a second switching element(47), for generating power for driving an elevator brake (8) by alternately operating each of the first switching element (46) and the second switching element (47);
a first photocoupler (33) and a second photocoupler (34) for independently operating the first switching element (46) and the second switching element (47), respectively; and
a first calculation unit (51) and a second calculation unit (52) for independently controlling power supply voltages of the first photocoupler (33) and the second photocoupler (34), respectively.
2. The elevator control apparatus according to claim 1,
wherein the first calculation unit (51) is configured to perform a control for periodically varying the power supply voltage of the first photocoupler (33) so that operation of the first photocoupler (33) is not hindered, and to monitor the power supply voltage of each of the first photocoupler (33) and the second photocoupler (34), and
wherein the second calculation unit (52) is configured to perform a control for periodically varying the power supply voltage of the second photocoupler (34) so that operation of the second photocoupler (34) is not hindered, and to monitor the power supply voltage of each of the first photocoupler (33) and the second photocoupler (34).