WIRELESS POWER TRANSMISSION SYSTEM, METHOD AND APPARATUS FOR RESONANCE FREQUENCY TRACKING IN WIRELESS POWER TRANSMISSION SYSTEM

摘要

PURPOSE: A wireless power transmission system, a resonant frequency tracking method in the wireless power transmission system, and a device thereof are provided to reduce transmission power loss without a separate matching circuit by control of a resonant frequency. CONSTITUTION: A source device(110) includes an AC/DC converter(111), a power detector(113), a power conversion unit(114), a control and communication unit(115), and a source resonator(116). The AC/DC converter controls an output level of DC voltage corresponding to control of the control and communication unit. The power detector detects output current and voltage of the AC/DC converter. A target device(120) includes a target resonator(121), a rectification unit(122), a DC/DC converter(123), a switch unit(124), a charging unit(125), and a control and communication unit(126). [Reference numerals] (114) Power conversion unit; (115,126) Control and communication unit; (122) Rectification unit; (125) Charging unit