Wireless power transmission system

1. A wireless power transmission system comprising:

a power control device;

a power transmitting device;

a relay device; and

a power receiving device, wherein

the power control device includes:

a direct-current power supply; and

a main control circuit that generates a first load instruction value for the power transmitting device and a second load instruction value for the relay device,

the power transmitting device includes:

a power-transmitting-side inverter circuit that converts direct-current power provided from the direct-current power supply into power-transmitting-side alternating-current power;

a power-transmitting-side power transmitting antenna that wirelessly transmits the power-transmitting-side alternating-current power; and

a power-transmitting-side control circuit that transmits a first response signal to the first load instruction value to the power control device and controls the power-transmitting-side inverter circuit in accordance with the first load instruction value,

the relay device includes:

a relay-side power receiving circuit including:

i) a relay-side power receiving antenna that receives the power-transmitting-side alternating-current power;

ii) a relay-side rectifier that converts the power-transmitting-side alternating-current power into relay-side direct-current power; and

iii) a relay-side detection circuit that detects a value corresponding to a voltage value of the relay-side direct-current power,

a relay-side power transmitting circuit including:

i) a relay-side inverter circuit that converts the relay-side direct-current power into relay-side alternating-current power; and

ii) a relay-side power transmitting antenna that wirelessly transmits the relay-side alternating-current power, and

a load circuit including:

i) a load-side inverter circuit that converts the relay-side direct-current power into load-side alternating-current power;

ii) a relay-side load that is driven by the load-side alternating-current power; and

iii) a load-side control circuit that transmits a second response signal to the second load instruction value to the power control device and controls the relay-side load in accordance with the second load instruction value,

the power receiving device including:

a power-receiving-side power receiving antenna that receives the relay-side alternating-current power;

a power-receiving-side rectifier that converts the relay-side alternating-current power into power-receiving-side direct-current power; and

a power-receiving-side load that is driven by using the power-receiving-side direct-current power,

wherein the relay-side power receiving circuit of the relay device transmits the detected value corresponding to the voltage value of the relay-side direct-current power to the power transmitting device,

wherein the power-transmitting-side control circuit of the power transmitting device transmits the value corresponding to the voltage value of the relay-side direct-current power, which is received from the relay-side power receiving circuit, to the power control device, and

wherein the main control circuit of the power control device determines that not the load circuit but the relay-side power receiving circuit is faulty, and outputs a control signal indicating that the relay-side power receiving circuit is faulty when not receiving the second response signal from the load circuit within a first period and receiving the first response signal from the power transmitting device within a second period and not receiving the value corresponding to the voltage value of the relay-side direct-current power from the power transmitting device within the second period.

2. The wireless power transmission system according to claim 1 , wherein the power control device further includes a display, and

wherein the control signal is output from the main control circuit to the display.

3. The wireless power transmission system according to claim 1 , wherein if the second response signal is not received from the load circuit within the first period and if the first response signal is received from the power transmitting device within the second period and the value corresponding to the voltage value of the relay-side direct-current power is received from the power transmitting device within the second period, the main control circuit of the power control device determines that not the relay-side power receiving circuit but the load circuit is faulty, and outputs a control signal indicating that the load circuit is faulty.

4. The wireless power transmission system according to claim 1 , wherein the value corresponding to the voltage value of the relay-side direct-current power includes the voltage value of the relay-side direct-current power, a current value of the relay-side direct-current power, a power value of the relay-side direct-current power, or an impedance value of the relay-side direct-current power.

5. A wireless power transmission system comprising:

a power control device;

a power transmitting;

N relay devices; and

a power receiving device, wherein

the power transmitting device includes:

a power-transmitting-side inverter circuit that converts direct-current power into the power-transmitting-side alternating-current power;

a power-transmitting-side power transmitting antenna that wirelessly transmits the power-transmitting-side alternating-current power; and

a power-transmitting-side control circuit that controls the power-transmitting-side inverter circuit to adjust the power-transmitting-side alternating-current power,

the N relay devices including:

a sequentially first relay device;

an i-th relay device, i being an integer greater than or equal to 2 and less than or equal to N, the i-th relay device including an N-th relay device; and

an (i−1)-th relay device,

the sequentially first relay device including

a first relay-side power receiving circuit including:

i) a first relay-side power receiving antenna that receives the power-transmitting-side alternating-current power; and

ii) a first relay-side rectifier that converts the power-transmitting-side alternating-current power into first relay-side direct-current power, and

a first relay-side power transmitting circuit including:

i) a first relay-side inverter circuit that converts the first relay-side direct-current power into first relay-side alternating-current power; and

ii) a first relay-side power transmitting antenna that wirelessly transmits the first relay-side alternating-current power,

the i-th relay device includes:

an i-th relay-side power receiving circuit including:

i) an i-th relay-side power receiving antenna that receives (i−1)-th relay-side alternating-current power from the (i−1)-th relay device;

ii) an i-th relay-side rectifier that converts the (i−1)-th relay-side alternating-current power into i-th relay-side direct-current power; and

iii) an i-th relay-side detection circuit that detects a value corresponding to a voltage value of the i-th relay-side direct-current power,

an i-th relay-side power transmitting circuit including:

i) an i-th relay-side inverter circuit that converts the i-th relay-side direct-current power into i-th relay-side alternating-current power; and

ii) an i-th relay-side power transmitting antenna that wirelessly transmits the i-th relay-side alternating-current power; and

an i-th load circuit including:

i) an i-th load-side inverter circuit that converts the i-th relay-side direct-current power into i-th load-side alternating-current power;

ii) an i-th relay-side load that is driven by the i-th load-side alternating-current power; and

iii) an i-th load-side control circuit that controls the i-th relay-side load,

the power receiving device includes:

a power-receiving-side power receiving antenna that receives N-th relay-side alternating-current power from the N-th relay device;

a power-receiving-side rectifier that converts the N-th relay-side alternating-current power into power-receiving-side direct-current power; and

a power-receiving-side load that is driven by using the power-receiving-side direct-current power,

the power control device includes:

a direct-current power supply; and

a main control circuit that generates a first load instruction value for the (i−1)-th relay device and a second load instruction value for the i-th relay device,

the (i−1)-th relay device includes:

an (i−1)-th relay-side power transmitting circuit including:

an (i−1)-th relay-side inverter circuit: and

an (i−1)-th relay-side control circuit,

wherein the (i−1)-th relay-side power transmitting circuit transmits a first response signal to the first load instruction value to the power control device, and controls the (i−1)-th relay-side inverter circuit in accordance with the first load instruction value,

wherein the i-th load circuit of in the i-th relay device transmits a second response signal to the second load instruction value to the power control device, and controls the i-th load-side inverter circuit in accordance with the second load instruction value,

wherein the i-th relay-side power receiving circuit transmits the value corresponding to the voltage value of the i-th relay-side direct-current power detected by the i-th relay-side detection circuit to the (i−1)-th relay device,

wherein the (i−1)-th relay-side control circuit transmits the value corresponding to the voltage value of the i-th relay-side direct-current power, which is received from the i-th relay-side power receiving circuit, to the power control device, and

wherein the power control device determines that not the i-th load circuit but the i-th relay-side power receiving circuit is faulty, and outputs a control signal indicating that the i-th relay-side power receiving circuit is faulty when not receiving the second response signal from the i-th load circuit within a first period and receiving the first response signal from the (i−1)-th relay-side power transmitting circuit within a second period and not receiving the value corresponding to the voltage value of the i-th relay-side direct-current power from the (i−1)-th relay-side power transmitting circuit within the second period.

6. The wireless power transmission system according to claim 5 , wherein the power control device further includes a display, and

wherein the control signal is output from the main control circuit to the display.

7. The wireless power transmission system according to claim 5 , wherein if the second response signal is not received from the i-th load circuit within the first period and if the first response signal is received from the (i−1)-th relay-side power transmitting circuit within the second period and the value corresponding to the voltage value of the i-th relay-side direct-current power is received from the (i−1)-th relay-side power transmitting circuit within the second period, the main control circuit of the power control device determines that not the i-th relay-side power receiving circuit but the i-th load circuit is faulty, and outputs a control signal indicating that the i-th load circuit is faulty.

8. The wireless power transmission system according to claim 5 , wherein the value corresponding to the voltage value of the i-th relay-side direct-current power includes the voltage value of the i-th relay-side direct-current power, a current value of the i-th relay-side direct-current power, a power value of the i-th relay-side direct-current power, or an impedance value of the i-th relay-side direct-current power.

9. The wireless power transmission system according to claim 5 , wherein the sequentially first relay device further includes

a first load circuit including

i) a first load-side inverter circuit that converts the first relay-side direct-current power into first load-side alternating-current power,

ii) a first relay-side load that is driven by the first load-side alternating-current power, and

iii) a first load-side control circuit that controls the first relay-side load,

wherein the main control circuit included in the power control device generates a third load instruction value for the power transmitting device and a fourth load instruction value for the sequentially first relay device,

wherein the power-transmitting-side control circuit included in the power transmitting device transmits a third response signal to the third load instruction value to the power control device, and controls the power-transmitting-side inverter circuit in accordance with the third load instruction value,

wherein the first load circuit included in the sequentially first relay device transmits a fourth response signal to the fourth load instruction value to the power control device, and controls the first load-side inverter circuit in accordance with the fourth load instruction value,

wherein the first relay-side power receiving circuit included in the sequentially first relay device further includes a first relay-side detection circuit that detects a value corresponding to a voltage value of the first relay-side direct-current power, and transmits the detected value corresponding to the voltage value of the first relay-side direct-current power to the power transmitting device,

wherein the power-transmitting-side control circuit included in the power transmitting device transmits the value corresponding to the voltage value of the first relay-side direct-current power, which is received from the first relay-side power receiving circuit, to the power control device, and

wherein if the fourth response signal is not received from the first load circuit within the first period and if the third response signal is received from the power-transmitting-side control circuit within the second period and the value corresponding to the voltage value of the first relay-side direct-current power is not received from the power-transmitting-side control circuit within the second period, the main control circuit of the power control device determines that not the first load circuit but the first relay-side power receiving circuit is faulty, and outputs a control signal indicating that the first relay-side power receiving circuit is faulty.

10. The wireless power transmission system according to claim 9 , wherein if the fourth response signal is not received from the first load circuit within the first period and if the third response signal is received from the power-transmitting-side control circuit within the second period and the value corresponding to the voltage value of the first relay-side direct-current power is received from the power-transmitting-side control circuit within the second period, the main control circuit of the power control device determines that not the first relay-side power receiving circuit but the first load circuit is faulty, and outputs a control signal indicating that the first load circuit is faulty.

11. The wireless power transmission system according to claim 9 , wherein the value corresponding to the voltage value of the first relay-side direct-current power includes the voltage value of the first relay-side direct-current power, a current value of the first relay-side direct-current power, a power value of the first relay-side direct-current power, or an impedance value of the first relay-side direct-current power.