Power transmission device and method of tracking maximum efficiency point of a system including the power transmission device and power reception device

摘要

A power transmission device may be disclosed. The power transmission device may include a power supply unit, a converter, an inverter, a transmission coil, and a control unit. The control unit obtains a rectified voltage transferred from the rectifier to the regulator, changes a first parameter among a plurality of parameters related to power transmission of the transmitting coil, and the difference value between the rectified voltage and the target rectified voltage is check whether it is equal to or greater than a threshold value, and if the difference value is equal to or greater than the threshold value, adjust a second parameter among the plurality of parameters based on a change in the first parameter so that the rectified voltage is maintained, and the first parameter and calculating the power transmission efficiency of the system after the second parameter is changed, maintaining the change direction of the first parameter when the power transmission efficiency increases, and changing the direction of the first parameter when the power transmission efficiency decreases may be set to be reversed, and the first parameter may be changed every first period to track a maximum efficiency operating point at which the power transmission efficiency of the system is maximized. In addition to this, various embodiments identified through the specification are possible.