FREQUENCY CHARACTERISTIC MEASUREMENT METHOD

• US 20160252553A1
• Filed: 04/21/2016
• Published: 09/01/2016
• Est. Priority Date: 11/13/2013
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: GOMA, SHINJI, Ichikawa, Keiichi
• Granted Patent: US 10,018,659 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01R 23/04 adapted for measuring in circuits having distributed constants
• CPC Class Codes: G01R 23/16 Spectrum analysis; Fourier analysis
• CPC Class Codes: G01R 29/0878 Sensors; antennas; probes; detectors wave guide measuring sections G01R1/24
• CPC Class Codes: H02J 50/05 using capacitive coupling
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 7/342 The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging with circuits for polarity protection H02J7/0034

Abstract

A power transmission-side measurement tool is installed in a power transmitting apparatus that applies an AC voltage stepped up by a step-up transformer to an active electrode and a passive electrode. The power transmission-side measurement tool includes a measurement active electrode that faces the active electrode and a measurement passive electrode that faces the passive electrode, and the measurement active electrode and measurement passive electrode are shorted together. Frequency characteristics of a serial resonance circuit formed by leakage inductance of the step-up transformer and capacitors are measured in a state where the power transmission-side measurement tool is placed on the power transmitting apparatus.

Claims

1. A method for measuring frequency characteristics of a power transmitting apparatus having an AC generating circuit, a power transmission resonance circuit connected to the AC generating circuit, and first and second electrodes connected to an output side of the power transmission resonance circuit, the method comprising:

placing a power transmission side measurement tool having first and second measurement electrodes in operational engagement with the first and second electrodes, respectively, whereby the power transmission side measurement tool is in operational engagement with the power transmission apparatus; and

while the power transmission side measurement tool is in operational engagement with the power transmission apparatus, measuring the frequency characteristics of the power transmission resonance circuit at a location between the AC generating circuit and the power transmission resonance circuit.

2. The method according to claim 1, wherein the frequency characteristics are a resonant frequency of the power transmission resonance circuit and a Q value.

3. The method according to claim 1, wherein the first and second measurement electrodes are shorted together.

4. The method according to claim 1, wherein the first and second measurement electrodes are connected to each other with a capacitance interposed there between.

5. The method according to claim 1, wherein the first and second electrodes and the first and second measurement electrodes are interposed between a power transmission side ground electrode which is provided in the power transmitting apparatus and which is connected to a ground potential of the power transmitting apparatus and a tool-side ground electrode provided in the power transmission side measurement tool and connected to a ground potential of the power transmitting apparatus.

6. The method according to claim 1, wherein the power transmitting side measurement tool does not include any resonance circuits.

7. A method for measuring the frequency characteristics of a power receiving apparatus having first and second electrodes, a power reception resonance circuit having an input side connected to the first and second electrodes, and a rectifying circuit connected to an output side of the power reception resonance circuit, the method comprising:

placing a power reception side measurement tool having first and second measurement electrodes in operational engagement with the first and second electrodes,

respectively, whereby the power reception side measurement tool is in operational engagement with the power receiving apparatus; and

while the power reception side measurement tool is in operational engagement with the power receiving apparatus, measuring the frequency characteristics of the power reception resonance circuit at a location between the power reception resonance circuit and the rectifying circuit.

8. The method according to claim 7, wherein the frequency characteristics are a resonant frequency of the power reception resonance circuit and a Q value.

9. The method according to claim 7, wherein the first and second measurement electrodes are shorted together.

10. The method according to claim 7, wherein the first and second measurement electrodes are connected with a capacitance interposed there between.

11. The method according to claim 7, wherein the first and second electrodes and the first and second measurement electrodes are interposed between a power reception side ground electrode which is provided in the power receiving apparatus and which is connected to a ground potential of the power receiving apparatus and a power reception side measurement tool ground electrode provided in the power reception side measurement tool and which is connected to the ground potential of the power receiving apparatus.

12. The method according to claim 7, wherein the power reception side measurement tool does not include any resonance circuits.

13. A method for measuring frequency characteristics of a power transmitting apparatus having an AC generating circuit, serial resonance circuit having first and second input ends connected to the AC generating circuit, and first and second electrodes connected to an output side of the serial resonance circuit, the method comprising:

placing a power transmission side measurement tool having first and second measurement electrodes in operational engagement with the first and second electrodes, respectively, whereby the power transmission side measurement tool is in operational engagement with the power transmission apparatus and the first and second input ends of the serial resonance circuit are connected; and

while the power transmission side measurement tool is in operational engagement with the power transmission apparatus, measuring the frequency characteristics of the serial resonance circuit at a location between the first and second measurement electrodes.

14. The method according to claim 13, wherein the frequency characteristics are a resonant frequency of the serial resonance circuit and a Q value.

15. The method according to claim 13, wherein the first and second measurement electrodes are shorted together.

16. The method according to claim 13, wherein the first and second input ends of the serial resonance circuit are connected with a capacitance interposed there between.

17. The method according to claim 13, wherein the power transmitting side measurement tool does not include any resonance circuits.

18. A method for measuring frequency characteristics of a power transmitting apparatus having an AC generating circuit, a parallel resonance circuit having first and second input ends connected to the AC generating circuit, and first and second electrodes connected to an output side of the parallel resonance circuit, the method comprising:

placing a power transmission side measurement tool having first and second measurement electrodes in operational engagement with the first and second electrodes, respectively, whereby the power transmission side measurement tool is in operational engagement with the power transmission apparatus; and

while the power transmission side measurement tool is in operational engagement with the power transmission apparatus, measuring a frequency of the parallel resonance circuit at a location between the first and second measurement electrodes.

19. The method according to claim 18, wherein the frequency characteristics are a resonant frequency of the parallel resonance circuit and a Q value.

20. The frequency characteristic measurement method according to claim 18, wherein the first and second electrodes and the first and second measurement electrodes are interposed between a power transmission side ground electrode which is provided in the power transmitting apparatus and which is connected to a ground potential of the power transmitting apparatus and a tool-side ground electrode provided in the power transmission side measurement tool and connected to the ground potential of the power transmitting apparatus.

21. The method according to claim 18, wherein the power transmitting side measurement tool does not include any resonance circuits.

22. A method for measuring the frequency characteristics of a power receiving apparatus having first and second electrodes, a serial resonance circuit connected to the first and second electrodes, and a rectifying circuit connected to first and second output ends of the serial resonance circuit, the method comprising:

placing a power reception side measurement tool having first and second measurement electrodes in operational engagement with the first and second electrodes, respectively, whereby the power reception side measurement tool is in operational engagement with the power receiving apparatus; and

while the power reception side measurement tool is in operational engagement with the power receiving apparatus, measuring the frequency characteristics of the serial resonance circuit at a location between the first and second measurement electrodes.

23. The method according to claim 22, wherein the frequency characteristics are a resonant frequency of the serial resonance circuit and a Q value.

24. The method according to claim 22, wherein the first and second measurement electrodes are shorted together.

25. The method according to claim 22, wherein the first and second output ends of the serial resonance circuit are connected with a capacitance interposed there between.

26. The method according to claim 22, wherein the power reception side measurement tool does not include any resonance circuits.

27. A method for measuring frequency characteristics of a power receiving apparatus having first and second electrodes, a parallel resonance circuit connected to the first and second electrodes and a rectifying circuit connected to first and second output ends of the parallel resonance circuit, the method comprising:

placing a power reception side measurement tool having first and second measurement electrodes in operational engagement with the first and second electrodes, respectively, whereby the power receiving side measurement tool is in operational engagement with the power receiving apparatus; and

while the power reception side measurement tool is in operational engagement with the power receiving apparatus, measuring the frequency of the parallel resonance circuit at a location between the first and second electrodes.

28. The method according to claim 27, wherein the frequency characteristics are a resonant frequency of the parallel resonance circuit and a Q value.

29. The method according to claim 27, wherein the first and second electrodes and the first and second measurement electrodes are interposed between a power receiving side ground electrode which is provided in the power transmitting apparatus and which is connected to a ground potential of the power receiving apparatus and a power receiving side measurement tool ground electrode provided in the power reception side measurement tool and which is connected to the ground potential of the power receiving apparatus.

30. The method according to claim 27, wherein the power reception side measurement tool does not include any resonance circuits.