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US 9,793,747 B2Granted
Wireless power receiving device and power control method thereof
AssigneeLG Innotek Co., Ltd.
InventorSu Ho Bae
Life of this patent
Estimating the term…
Abstract
Disclosed is a wireless power receiver and a power control method thereof. The wireless power receiver includes a reception unit to receive power from the wireless power transmitter by using a resonance scheme; a load management unit to control an impedance of the load according to a state of the load; and a rectifying unit disposed between the reception unit and the load management unit in order to rectify the received power, wherein the power transmitted from the wireless power transmitter is controlled by the controlled impedance.
Claims13
A wireless power receiver which wirelessly receives power from a wireless power transmitter and transfers the power to a load, the wireless power receiver comprising:
- a reception unit to receive power from the wireless power transmitter by using a resonance scheme;
- a load management unit to control an impedance of the load according to a state of the load;
- and
- a rectifying unit disposed between the reception unit and the load management unit in order to rectify the received power,
- wherein the power transmitted from the wireless power transmitter is controlled by the controlled impedance,
- wherein the load management unit includes an impedance varying unit which controls the load impedance according to the state of the load,
- wherein the impedance varying unit includes a first switch device,
- wherein the first switch device is shorted so that the load impedance becomes 0Ω,
- wherein the reception unit includes a first reception induction coil and a second reception induction coil,
- wherein the rectifying unit includes a first rectifying diode, a second rectifying diode and a capacitor,
- wherein the first rectifying diode allows AC current to flow out or be cut off according to a polarity of the AC current applied to the first reception induction coil,
- wherein the second rectifying diode allows AC current to flow out or be cut off according to the polarity of the AC current applied to the second induction coil,
- wherein the capacitor is connected in parallel to the first reception induction coil,
- wherein the capacitor is connected in parallel to the second reception induction coil, and
- wherein one terminal of the first switch device is connected to an output terminal of the first rectifying diode, and the other terminal of the first switch device is connected to an output terminal of the second rectifying diode.
12 more elements
A method of controlling power of a wireless power receiver, the method comprising:
- transferring power wirelessly received from a wireless power transmitter to a load;
- identifying a state of the load;
- adjusting an impedance of the load according an identified state of the load;
- and
- receiving power of the wireless power transmitter controlled according to the adjusted impedance to transfer the power to the load,
- wherein the identifying of the state of the load is performed by detecting a current flowing through the load,
- wherein the adjusting of the impedance of the load includes controlling the impedance of the load to 0Ω when the current flowing through the load becomes 0 (zero),
- wherein a load management unit includes an impedance varying unit which controls the load impedance according to the state of the load,
- wherein the impedance varying unit includes a first switch device,
- wherein the first switch device is shorted so that the load impedance becomes 0Ω,
- wherein a reception unit includes a first reception induction coil and a second reception induction coil,
- wherein a rectifying unit includes a first rectifying diode, a second rectifying diode and a capacitor,
- wherein the first rectifying diode allows AC current to flow out or be cut off according to a polarity of the AC current applied to the first reception induction coil,
- wherein the second rectifying diode allows AC current to flow out or be cut off according to the polarity of the AC current applied to the second induction coil,
- wherein the capacitor is connected in parallel to the first reception induction coil,
- wherein the capacitor is connected in parallel to the second reception induction coil, and
- wherein one terminal of the first switch device is connected to an output terminal of the first rectifying diode, and the other terminal of the first switch device is connected to an output terminal of the second rectifying diode.
14 more elements
Dependencies are inferred from the claim text.