Wireless power transfer electric vehicle supply equipment installation and validation tool

1. A transmit pad inspection device comprising:

a magnetic coupling device including an inductive circuit that is configured to magnetically couple to a primary circuit of a charging device in a transmit pad as a secondary circuit through an alternating current (AC) magnetic field;

a controllable load bank connected to said magnetic coupling device;

the transmit pad inspection device configured to determine an input power applied to said primary circuit through communication with a device configured to measure said input power;

the transmit pad inspection device configured to determine an output power delivered to a load in said controllable load bank,

a magnetic field measurement device configured to measure at least a frequency of a magnetic field generated by said charging device,

wherein the transmit pad inspection device is configured to vary said output power by changing a selected impedance of said controllable load bank, and to determine a correlation between said output power and a frequency of said AC magnetic field as measured by the magnetic field measurement device for each setting for the selected impedance for the controllable load bank.

2. The transmit pad inspection device of claim 1 , wherein said device configured to measure said input power is a utility feed smart meter connected to said primary circuit of said charging device.

3. The transmit pad inspection device of claim 1 , further comprising a programmable logic control configured to determine an efficiency of power transfer under at least one coupling condition between said primary circuit and said inductive circuit.

4. The transmit pad inspection device of claim 1 , further comprising a magnetic field measurement device configured to measure a magnitude of a residual magnetic field in a transition zone and a public zone of said charging device.

5. The transmit pad inspection device of claim 1 , further comprising:

a magnetic field measurement device configured to measure at least a frequency of a magnetic field generated by said charging device; and

programmable logic control configured to determine a time delay between a first time point at which a load within said controllable load bank is changed and a second time point at which said frequency of said magnetic field stabilizes after said change in said load.

6. The transmit pad inspection device of claim 1 , further comprising a means for varying a spacing between said charging device and said magnetic coupling device.

7. The transmit pad inspection device of claim 1 , further comprising programmable logic control configured for transmitting a command for turning off said input power to said primary circuit, wherein said transmit pad inspection device is configured to monitor power delivered to said controllable load bank as a function of time after transmission of said command for turning off said input power to said primary circuit.

8. The transmit pad inspection device of claim 1 , further comprising:

a communication means configured to transmit information on a value of the selected impedance of said controllable load bank to a device controlling said input power to said primary circuit.

9. The transmit pad inspection device of claim 1 , wherein said transmit pad inspection device is configured to transmit instructions that set a frequency of a grid converter connected to said primary circuit, and wherein said transmit pad inspection device is configured to determine a correlation between said output power and said frequency of a grid converter for each setting for a selected impedance of said controllable load bank, and wherein said transmit pad inspection device further comprises a means for varying a spacing between said charging device and said magnetic coupling device, wherein said transmit pad inspection device is configured to determine a correlation between said spacing and said frequency of a grid converter.

10. A method of inspecting a transmit pad for wireless power transfer, said method comprising:

providing a transmit pad inspection device comprising a magnetic coupling device including an inductive circuit and a controllable load bank connected to said magnetic coupling device;

positioning said magnetic coupling device in a vicinity of a transmit pad of a charging device that includes a primary circuit, wherein said vicinity is selected to magnetically couple said inductive circuit to said primary circuit through an alternating current (AC) magnetic field generated by said primary circuit;

determining an input power applied to said primary circuit;

determining an output power delivered to a load in said controllable load bank;

transmitting instructions that set a frequency of a grid converter from said transmit pad inspection device to said primary circuit;

determining a correlation between said output power and said frequency of a grid converter for each setting for a selected impedance of said controllable load bank;

changing a spacing between said charging device and said magnetic coupling device; and

determining a correlation between said spacing and said frequency of a grid converter.

11. The method of claim 10 , wherein said determining of said input power comprises transmitting information on said input power from a device wired to said primary circuit and configured to measure said input power to said transmit pad inspection device, and wherein said device wired to said primary circuit and configured to measure said input power is a utility feed smart meter connected to said primary circuit of said charging device.

12. The method of claim 10 , further comprising determining an efficiency of power transfer under at least one coupling condition between said primary circuit and said inductive circuit.

13. The method of claim 10 , further comprising measuring a magnitude of a residual magnetic field in a transition zone and a public zone of said charging device employing a magnetic field measurement device.

14. The method of claim 10 , further comprising:

measuring at least a frequency of a magnetic field generated by said charging device employing a magnetic field measurement device; and

determining a time delay between a first time point at which a load within said controllable load bank is changed and a second time point at which said frequency of said magnetic field stabilizes after said change in said load.

15. The method of claim 10 , further comprising:

changing a spacing between said charging device and said magnetic coupling device;

determining another input power applied to said primary circuit after said changing of said spacing; and

determining another output power delivered to a load in said controllable load bank after said changing of said spacing.

16. The method of claim 10 , further comprising:

transmitting a command for turning off said input power from said transmit pad inspection device to said primary circuit; and

monitoring power delivered to said controllable load bank as a function of time after transmission of said command for turning off said input power to said primary circuit.

17. The method of claim 10 , further comprising:

transmitting information on a value of a selected impedance of said controllable load bank from said transmit pad inspection device to a device controlling said input power to said primary circuit; and

measuring at least a frequency of a magnetic field generated by said charging device employing a magnetic field measurement device.

18. The method of claim 17 , further comprising:

varying said output power by changing said selected impedance of said controllable load bank; and

determining a correlation between said output power and a frequency of said AC magnetic field as measured by said magnetic field measurement device for each setting for said selected impedance for said controllable load bank.