WIRELESS INDUCTIVE POWER TRANSFER Russian patent published in 2018 - IPC H02J5/00 H02J50/12 

FIELD: electrical equipment.

SUBSTANCE: invention relates to the electrical equipment. Wireless power transmission system includes power receiver and power transmitter transmitting power through inductive power signal. Power transmitter comprises resonance circuit (201) comprising capacitive resistance (503) and inductive resistor (501). Excitation unit (203) generates excitation signal for resonant circuit. Frequency modification loop (505) controls resonant frequency of resonant circuit (201) by slowing state change of at least one of capacitive resistance (503) and inductive resistor (501) for partial time interval of at least some excitation signal cycles. Frequency modification circuit (505) is configured to equalize at least one of start time and end time of partial time interval with transitions of clock signal. In power transmitter, excitation unit (203) also generates timing signal, which has synchronized with excitation signal transitions. Deceleration can be understood as impeding current flow between capacitive and inductive resistances (503, 501).

EFFECT: technical result is to improve characteristics of wireless power transmission.

15 cl, 21 dwg