Relay driving apparatus for controlling operation of multiple switches

A relay driving device comprising:

• a relay including a relay switch and a relay coil magnetically coupled to the relay switch to turn on or off the relay switch;
• a controller for outputting a first control signal;
• a first switch for receiving the first control signal and being turned on or off to supply or block a first current to the relay coil;
• a control resistor connected between the relay coil and the first switch;
• a signal generator for receiving the first control signal and generating a second control signal;
• and
• a second switch for receiving the second control signal and being turned on or off to supply or block a second current higher than the first current to the relay coil
• wherein the signal generator comprises,
• a time adjustment circuit for generating a third control signal delayed by the first control signal by a first time period or a second time period;
• and
• an XOR circuit for generating the second control signal of a high level when the first and third control signals are at different levels, and generating the second control signal of a low level when the first and third control signals are at a same level.