Power transmitting device and wireless power transmission system
First Claim
1. A power transmitting device comprising:
- a transmitter resonator that is electromagnetically coupled with a receiver resonator of a power receiving device and that transmits transmitting power;
an inverter circuit that generates the transmitting power to be output to the transmitter resonator; and
a power transmission control circuit that adjusts the transmitting power output from the inverter circuit by adjusting a control parameter Q that determines a voltage of the transmitting power based on information indicating a voltage inside the power receiving device, the information being input from the power receiving device,wherein, in a state in which a predetermined period has elapsed since a beginning of power transmission and the transmitting power has converged within a predetermined range, the power transmission control circuit determines transmitting power P(t1) at a first time t1, which is a beginning of a first unit time, and transmitting power P(t2) at a second time t2, which is an end of the first unit time,wherein the power transmission control circuit stores a control parameter Q(t3) that determines a voltage of the transmitting power at a third time t3, which is a beginning of a second unit time, and a control parameter Q(t4) that determines a voltage of the transmitting power at a fourth time t4, which is an end of the second unit time,wherein the power transmission control circuit determines a power difference Δ
P =P(t2)−
P(t1) and a difference Δ
Q =Q(t4)−
Q(t3) in the control parameter Q,wherein, if the Δ
P is equal to or larger than a first threshold and an absolute value of the Δ
Q is equal to or larger than a second threshold, the power transmission control circuit determines that there is a foreign object between the receiver resonator and the transmitter resonator and decreases the transmitting power output from the inverter circuit,wherein, if the Δ
P is smaller than the first threshold or if the absolute value of the Δ
Q is smaller than the second threshold, the power transmission control circuit determines that there is no foreign object between the receiver resonator and the transmitter resonator and causes the inverter circuit to continue transmitting the same transmitting power, andwherein the control parameter Q includes at least either a parameter that determines an output period ratio, which is a ratio of a period of time for which the voltage output from the inverter circuit is not zero to one period of the voltage, or a frequency of the voltage.
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Accused Products
Abstract
A power transmitting device determines transmitting power P(t1) at a beginning of a first unit time, and transmitting power P(t2) at an end of the first unit time, stores a control parameter Q(t3) that determines a voltage of the transmitting power at a beginning of a second unit time, and a control parameter Q(t4) that determines a voltage of the transmitting power at an end of the second unit time, determines a power difference ΔP=P(t2)−P(t1) and a difference ΔQ=Q(t4)−Q(t3) in the control parameter Q, and, if the ΔP is equal to or larger than a first threshold and an absolute value of the ΔQ is equal to or larger than a second threshold, determines that there is a foreign object between a receiver resonator and a transmitter resonator and decreases the transmitting power output from an inverter circuit.
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Citations
14 Claims
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1. A power transmitting device comprising:
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a transmitter resonator that is electromagnetically coupled with a receiver resonator of a power receiving device and that transmits transmitting power; an inverter circuit that generates the transmitting power to be output to the transmitter resonator; and a power transmission control circuit that adjusts the transmitting power output from the inverter circuit by adjusting a control parameter Q that determines a voltage of the transmitting power based on information indicating a voltage inside the power receiving device, the information being input from the power receiving device, wherein, in a state in which a predetermined period has elapsed since a beginning of power transmission and the transmitting power has converged within a predetermined range, the power transmission control circuit determines transmitting power P(t1) at a first time t1, which is a beginning of a first unit time, and transmitting power P(t2) at a second time t2, which is an end of the first unit time, wherein the power transmission control circuit stores a control parameter Q(t3) that determines a voltage of the transmitting power at a third time t3, which is a beginning of a second unit time, and a control parameter Q(t4) that determines a voltage of the transmitting power at a fourth time t4, which is an end of the second unit time, wherein the power transmission control circuit determines a power difference Δ
P =P(t2)−
P(t1) and a difference Δ
Q =Q(t4)−
Q(t3) in the control parameter Q,wherein, if the Δ
P is equal to or larger than a first threshold and an absolute value of the Δ
Q is equal to or larger than a second threshold, the power transmission control circuit determines that there is a foreign object between the receiver resonator and the transmitter resonator and decreases the transmitting power output from the inverter circuit,wherein, if the Δ
P is smaller than the first threshold or if the absolute value of the Δ
Q is smaller than the second threshold, the power transmission control circuit determines that there is no foreign object between the receiver resonator and the transmitter resonator and causes the inverter circuit to continue transmitting the same transmitting power, andwherein the control parameter Q includes at least either a parameter that determines an output period ratio, which is a ratio of a period of time for which the voltage output from the inverter circuit is not zero to one period of the voltage, or a frequency of the voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power transmitting device comprising:
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a transmitter resonator that is electromagnetically coupled with the receiver resonator of a power receiving device and that transmits the transmitting power; an inverter circuit that generates the transmitting power to be output to the transmitter resonator; and a power transmission control circuit that adjusts the transmitting power output from the inverter circuit by adjusting a control parameter that determines a voltage of the transmitting power based on information indicating a voltage inside the power receiving device, the information being input from the power receiving device, wherein, in a state in which a predetermined period of time has elapsed since a beginning of power transmission and the transmitting power has converged within a predetermined range, the power transmission control circuit determines transmitting power P(t1) at a first time t1, which is a beginning of a first unit time, and transmitting power P(t2) at a second time t2, which is an end of the first unit time, wherein the power transmission control circuit stores a voltage V(t3) of the transmitting power at a third time t3, which is a beginning of a second unit time, and a voltage V(t4) of the transmitting power at a fourth time t4, which is an end of the second unit time, wherein the power transmission control circuit determines a power difference Δ
P =P(t2)−
P(t1) and a voltage difference Δ
V =V(t4)−
V(t3),wherein, if the Δ
P is equal to or larger than a first threshold and the Δ
V is equal to or larger than a second threshold, the power transmission control circuit determines that there is a foreign object between the receiver resonator and the transmitter resonator and decreases the transmitting power output from the inverter circuit, andwherein, if the Δ
P is smaller than the first threshold or if the Δ
V is smaller than the second threshold, the power transmission control circuit determines that there is no foreign object between the receiver resonator and the transmitter resonator and causes the inverter circuit to continue transmitting the same transmitting power. - View Dependent Claims (9, 10)
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11. A power transmitting device comprising:
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a transmitter resonator that is electromagnetically coupled with the receiver resonator of a power receiving device and that transmits the transmitting power; an inverter circuit that generates the transmitting power to be output to the transmitter resonator; a power transmission control circuit that adjusts the transmitting power output from the inverter circuit by adjusting a control parameter Q that determines a voltage of the transmitting power based on information indicating a voltage inside the power receiving device, the information being input from the power receiving device; and a sensor circuit that measures the control parameter Q, wherein, in a state in which a predetermined period of time has elapsed since a beginning of power transmission and the transmitting power has converged within a predetermined range, the power transmission control circuit determines transmitting power P(t1) at a first time t1, which is a beginning of a first unit time, and transmitting power P(t2) at a second time t2, which is an end of the first unit time, wherein the power transmission control circuit stores a measured value S(t3) obtained by measuring a control parameter Q(t3) that determines a voltage of the transmitting power at a third time t3, which is a beginning of a second unit time, and a measured value S(t4) obtained by measuring a control parameter Q(t4) that determines a voltage of the transmitting power at a fourth time t4, which is an end of the second unit time, wherein the power transmission control circuit determines a power difference Δ
P =P(t2)−
P(t1) and a difference Δ
S =S(t4)−
S(t3) in the measured value of the control parameter Q,wherein, if the Δ
P is equal to or larger than a first threshold and an absolute value of the Δ
S is equal to or larger than a third threshold, the power transmission control circuit determines that there is a foreign object between the receiver resonator and the transmitter resonator and decreases the transmitting power output from the inverter circuit, andwherein, if the Δ
P is smaller than the first threshold or if the absolute value of the Δ
S is smaller than the third threshold, the power transmission control circuit determines that there is no foreign object between the receiver resonator and the transmitter resonator and causes the inverter circuit to continue transmitting the same transmitting power. - View Dependent Claims (12, 13, 14)
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Specification