Wireless power reception apparatus and method based on switching

A wireless power reception apparatus comprising:

• a reception (RX) resonator configured to form a resonance coupling with a first resonance period associated with an envelope of a power to receive the power from a transmission (TX) resonator;
• a switch controller configured to generate, at intervals of the first resonance period, a control signal to deactivate the RX resonator at an off timing corresponding to a time instant at which a maximum energy is stored in an inductor of the RX resonator;
• and
• a switch configured to deactivate the RX resonator in response to the control signal, wherein the switch controller is further configured to observe a second voltage signal applied to a load by deactivating the switch at intervals of at least one predetermined time instant in the first resonance period, and set, as an off timing, a time instant at which the observed second voltage signal has a maximum magnitude.

A wireless power reception method comprising:

• forming a resonance coupling with a first resonance period associated with an envelope of a power to receive the power from a transmission (TX) resonator;
• setting an off timing, corresponding to a time instant at which a maximum energy is stored in an inductor of a reception (RX) resonator, based on a sensed first voltage signal corresponding to the power received by the RX resonator from the TX resonator during the first resonance period;
• generating, at intervals of the first resonance period, a control signal to deactivate the RX resonator at the set off timing;
• and
• deactivating the RX resonator in response to the generated control signal.

A wireless power reception method comprising:

• forming a resonance coupling with a first resonance period associated with an envelope of a power to receive the power from a transmission (TX) resonator;
• generating, at intervals of the first resonance period, a control signal to deactivate a reception (RX) resonator at an off timing corresponding to a time instant at which a maximum energy is stored in an inductor of the RX resonator;
• and
• deactivating the RX resonator in response to the control signal, wherein the generating comprises:
• observing a second voltage signal applied to a load by deactivating the switch at intervals of at least one predetermined time instant in the first resonance period;
• and setting, as an off timing, a time instant at which the observed second voltage signal has a maximum magnitude.