Multi-coil wireless charging method and device and system therefor
First Claim
1. A wireless power transmitter for wirelessly transmitting power to a wireless power receiver, the wireless power transmitter comprising:
- a power transmission unit comprising at least two transmission coils;
a controller configured to control a first detection signal for detecting presence of the wireless power receiver so as to be transmitted simultaneously using different frequencies pre-allocated to each of the transmission coils; and
a modulation/demodulation unit configured to transmit, when a first signal strength indicator corresponding to the first detection signal is received from the wireless power receiver, the received first signal strength indicator and a predetermined transmission coil identifier for identifying a transmission coil through which the first signal strength indicator has been received to the controller,wherein the controller controls a second detection signal so as to be transmitted through the transmission coil through which the first signal strength indicator has been received.
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Accused Products
Abstract
The present invention relates to a multi-coil wireless charging method and a device and a system therefor, a wireless power transmitter for wirelessly transmitting power to a wireless power receiver, according to one embodiment of the present invention, comprising: a power transmission unit which comprises at least two or more transmission coils; a control unit which controls so that a primary detection signal for detecting the existence of a wireless power receiver is simultaneously transmitted by using frequencies that are different from each other that were allocated to each of the transmission coils in advance; and a demodulation unit which, if a first signal strength indicator associated with the primary detection signal is received from the wireless power receiver, transmits, to the control unit, the received first signal strength indicator and a preset transmission coil identifier for identifying the transmission coil through which the first signal strength indicator was received, wherein the control unit may control so that a secondary detection signal is transmitted through the transmission coil through which the first signal strength indicator was received. Thus, the present invention has a merit of enabling a quicker and more accurate detection of a wireless power receiver.
8 Citations
19 Claims
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1. A wireless power transmitter for wirelessly transmitting power to a wireless power receiver, the wireless power transmitter comprising:
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a power transmission unit comprising at least two transmission coils; a controller configured to control a first detection signal for detecting presence of the wireless power receiver so as to be transmitted simultaneously using different frequencies pre-allocated to each of the transmission coils; and a modulation/demodulation unit configured to transmit, when a first signal strength indicator corresponding to the first detection signal is received from the wireless power receiver, the received first signal strength indicator and a predetermined transmission coil identifier for identifying a transmission coil through which the first signal strength indicator has been received to the controller, wherein the controller controls a second detection signal so as to be transmitted through the transmission coil through which the first signal strength indicator has been received. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for transmitting wireless power to a wireless power receiver by a wireless power transmitter having a plurality of transmission coils, the method comprising:
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simultaneously transmitting a first detection signal for detecting presence of the wireless power receiver using differently assigned frequencies for each of the transmission coils; identifying at least one frequency corresponding to a transmission coil through which a first signal strength indicator corresponding to the first detection signal has been received; transmitting a second detection signal using the identified at least one frequency; and determining a frequency to be used for power transmission based on a second signal strength indicator received corresponding to the second detection signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A wireless power receiver for wirelessly receiving power from a wireless power transmitter, the wireless power receiver comprising:
- a reception coil;
a frequency filter configured to filter first to n-th frequencies for an AC signal received through the reception coil; and
a main controller configured to identify at least one frequency at which a first detection signal is received, based on the filtered signal, wherein the main controller controls a first signal strength indicator corresponding to the first detection signal so as to be transmitted through the identified at least one frequency,wherein, when a second detection signal is received through the at least one frequency at which the first signal strength indicator has been transmitted, the main controller controls a second signal strength indicator so as to be transmitted through a frequency corresponding to the second detection signal, and a frequency to be used for power transmission is selected by the wireless power transmitter based on the second signal strength indicator. - View Dependent Claims (19)
- a reception coil;
Specification