Wireless power transmitting device and wireless power transmitting system including amplifier having controlled power voltage
Provided is a wireless power transmitting system and device, the wireless power transmitting device including: a signal generator configured to generate an initial signal; a controller configured to output an amplitude control signal and a phase control signal; a phase modulator configured to generate a phase-modulated signal by modulating a phase of the initial signal based on the phase control signal; a power amplifier configured to generate a power signal by amplifying the phase-modulated signal; a voltage converter configured to control a magnitude of a power voltage of the power amplifier based on the amplitude control signal; and an antenna configured to externally output the power signal.
1 . A wireless power transmitting device comprising:
a signal generator configured to generate an initial signal;
a controller configured to output an amplitude control signal and a phase control signal;
a phase modulator configured to generate a phase-modulated signal by modulating a phase of the initial signal based on the phase control signal;
a power amplifier configured to generate a power signal by amplifying the phase-modulated signal;
a voltage converter configured to control a magnitude of a power voltage of the power amplifier based on the amplitude control signal; and
an antenna configured to externally output the power signal,
wherein the power amplifier is further configured to control an amplitude of the power signal based on the magnitude of the power voltage and a separately settable gain of the power amplifier, and
wherein the controller is further configured to output the amplitude control signal to adjust the magnitude of the power voltage such that a power efficiency of the power amplifier is maximized with respect to a target amplitude of the power signal.
2 . The wireless power transmitting device of claim 1 , wherein the controller is further configured to output the amplitude control signal so that the target amplitude of the power signal is equal to a maximum amplitude of an output signal of the power amplifier.
3 . The wireless power transmitting device of claim 1 , wherein the amplitude control signal has a direct current voltage, and
wherein the voltage converter is further configured to control the magnitude of the power voltage to be proportional to the amplitude control signal.
4 . The wireless power transmitting device of claim 1 , wherein the voltage converter comprises at least one of a variable direct current-to-direct current converter, an analog low-dropout (LDO) regulator, and a digital LDO regulator.
5 . The wireless power transmitting device of claim 1 , wherein the phase control signal comprises an analog signal or a digital signal, and
wherein the phase modulator is further configured to determine a phase offset based on the phase control signal and to modulate the phase of the initial signal based on the phase offset.
6 . The wireless power transmitting device of claim 1 , further comprising:
a driving amplifier connected between an output terminal of the signal generator and an input terminal of the power amplifier.
7 . The wireless power transmitting device of claim 1 , further comprising:
a filter connected between an output terminal of the power amplifier and an input terminal of the antenna.
8 . The wireless power transmitting device of claim 1 , wherein the initial signal is a radio frequency signal.
9 . A wireless power transmitting device comprising:
a signal generator for generating an initial signal;
a sensor configured to sense a phase and an amplitude of a beacon signal from a wireless power receiving device;
a controller configured to output an amplitude control signal and a phase control signal based on the phase and the amplitude of the beacon signal;
a phase modulator configured to generate a phase-modulated signal by modulating a phase of the initial signal based on the phase control signal;
a power amplifier configured to generate a power signal by amplifying the phase-modulated signal;
a voltage converter configured to control a magnitude of a power voltage of the power amplifier based on the amplitude control signal; and
one or more antennas configured to receive the beacon signal and to transmit the power signal to the wireless power receiving device,
wherein the power amplifier is further configured to control an amplitude of the power signal based on the magnitude of the power voltage and a separately settable gain of the power amplifier, and
wherein the controller is further configured to output the amplitude control signal to adjust the magnitude of the power voltage such that a power efficiency of the power amplifier is maximized with respect to a target amplitude of the power signal.
10 . The wireless power transmitting device of claim 9 , wherein the controller is further configured to, based on the phase of the beacon signal, output the phase control signal so that the power signal has a time-reversed phase relative to the phase of the beacon signal.
11 . The wireless power transmitting device of claim 9 , wherein the one or more antennas comprise:
a first antenna configured to receive the beacon signal; and
a second antenna configured to transmit the power signal.
12 . A wireless power transmitting system comprising:
an antenna array comprising a plurality of antenna elements each respectively configured to output a power signal; and
a plurality of wireless power transmitting devices connected to each of the plurality of antenna elements,
wherein each of the plurality of wireless power transmitting devices comprises:
a signal generator configured to generate an initial signal;
a controller configured to output an amplitude control signal and a phase control signal;
a phase modulator configured to generate a phase-modulated signal by modulating a phase of the initial signal based on the phase control signal;
a power amplifier configured to generate the power signal by amplifying the phase-modulated signal; and
a voltage converter configured to control a magnitude of a power voltage of the power amplifier based on the amplitude control signal,
wherein, for each of the plurality of wireless power transmitting devices, the power amplifier is further configured to control an amplitude of the power signal based on the magnitude of the power voltage and a separately settable gain of the power amplifier, and
wherein, for each of the plurality of wireless power transmitting devices, the controller is further configured to output the amplitude control signal to adjust the magnitude of the power voltage such that a power efficiency of the power amplifier is maximized with respect to a target amplitude of the power signal.
13 . The wireless power transmitting system of claim 12 , wherein the wireless power transmitting system further comprises:
a sensor configured to sense a phase and an amplitude of a beacon signal from a wireless power receiving device.
14 . The wireless power transmitting system of claim 13 , wherein each of the plurality of antenna elements is further configured to receive the beacon signal.
15 . The wireless power transmitting system of claim 13 , wherein the antenna array further comprises a receiving antenna configured to receive the beacon signal.
16 . The wireless power transmitting system of claim 13 ,
wherein the plurality of antenna elements comprises one or more central antenna elements and one or more peripheral antenna elements, and
wherein the sensor is further configured to cause the one or more central antenna elements to output a power signal having a larger amplitude than a power signal output by the one or more peripheral antenna elements.
17 . The wireless power transmitting system of claim 13 , wherein the sensor is further configured to transmit a control signal according to a sensing result to each of the plurality of wireless power transmitting devices.
18 . The wireless power transmitting system of claim 12 , wherein the plurality of antenna elements comprise at least one of a patch antenna, a dipole antenna, and a chip antenna.
19 . The wireless power transmitting system of claim 12 , further comprising a substrate, the substrate comprising:
a front portion on which the plurality of antenna elements are arranged, and
a rear portion on which the plurality of wireless power transmitting devices are arranged.