Wireless charging pad including plurality of small power transmission coils and device for and method of driving wireless charging pad in wireless power transmission system

A driving device for a wireless charging pad comprising a plurality of small power transmission coils, the driving device comprising:

• a first driving controller configured to each independently control driving of small power transmission coils of a first wireless charge module comprising the small power transmission coils;
• a second driving controller configured to each independently control driving of small power transmission coils of a second wireless charge module comprising the small power transmission coils;
• and
• a plurality of driving modules configured to respectively drive the small power transmission coils of the first and second wireless charge modules according to a first or second control signal input from the first and second driving controllers.

A method of driving a wireless charging pad comprising a plurality of small power transmission coils, the method comprising:

• a coil driving determination step of investigating power transmission coils to be driven matching a device to be charged among the small power transmission coils and investigating power transmission coils surrounding the power transmission coils to be driven among the small power transmission coils;
• a control signal generation step of generating a first control signal to apply a first driving voltage having a first phase to the power transmission coils to be driven and generating a second control signal to apply a second driving voltage having a phase different from the first phase to the surrounding power transmission coils;
• and
• a driving signal application step of applying the first and second driving signals to a wireless charging pad.