JP2015100233A - Non-contact power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a signal transmission system between the transmission and reception sides of a non-contact power supply system, using a part of the configuration of the non-contact power supply system.SOLUTION: A part of an antenna in a power transmission/reception part is used as an antenna for signal transmission, to thereby form a signal transmission system. A tap is extracted from the intermediate point of a power reception-side coil 38, so that both sides of the coil are used as a power reception coil and a signal transmission coil 381. Also, a tap is extracted from the intermediate point of a power transmission-side coil 33, so that both sides of the coil are used as a power transmission coil and a signal reception coil 331. The signal transmission/reception is performed based on a design of a resonance system configuration whose resonance frequency greatly deviates from a resonance frequency for power supply.

Description

  The present invention relates to a method for transmitting a signal in a system for sending power without contact.

  FIG. 1 shows a conventional example of non-contact power feeding in this kind of JP2012-060730A.

  Further, there are four combinations of this type of non-contact power feeding method as described in Non-Patent Document 1. This equivalent circuit is shown in FIG.

  In the system of FIG. 1, the power of the transmitter 11 of the power transmission side device is injected into the power transmission side antenna 14 and transmitted to the power reception side antenna 15 magnetically coupled thereto. On the power receiving side, power is supplied to the load 16 via the power receiving side antenna.

  Here, for example, when a charging system such as a battery is considered as the load, there is a need to transmit the charging state information to the supply side.

  In this example, the control unit 18 detects that the charging is completed, and the relay 19 is released so that the resistor 17 is inserted in series into the load system. As a result, a change in supply current is generated on the power transmission side, this is detected by the state detection unit 13, and control such as stopping the transmitter by the power transmission control unit 12 is performed.

Takahiro Toui, Hiroyoshi Kaneko, Shigeru Abe: Representation of maximum efficiency of non-contact power feeding by coupling coefficient k and coil Q, Semiconductor Power Conversion Study Group, SPC-11-179 (2011.1.12.1)

JP 2012-060730 A

In this known example, the configuration is very simple, and it is a good idea for an application that simply conveys the status, such as conveying information that charging has been completed or whether it is abnormal or not.
However, there are the following problems in applications in which current information on the power receiving side or temperature information is transmitted to the power feeding side in real time.

  In such a system, it is necessary to handle at a single frequency due to the restriction of using a resonance system, and an amplitude-modulated waveform is recognized as a signal.

  For this reason, the size of the power feeding system must be changed. This is not convenient for a power supply system.

  Furthermore, in this case, it is intended to form a modulation signal by changing the load, but naturally it is necessary to open and close the load, the switching speed is limited, and high-speed signal transmission is difficult. is there.

  The present invention has been devised to address these various problems. The basic idea is to realize a resonance system having different frequencies by using a part of an antenna coil for power transmission and to use it for signal transmission.

  The non-contact power feeding system according to the present invention is to use a part of the antenna coil for power feeding as a coil for signal transmission.

  With such a configuration, independent communication is possible in a frequency region far away from the frequency of the power feeding system, and the speed is not greatly limited. Conversely, this circuit does not change the power feeding system. Furthermore, this system also constitutes one resonance type non-contact signal transmission system, and the signal reliability (confidentiality) is high.

  According to the first aspect of the present invention, a non-contact transmission system of a signal transmission system having different resonance frequencies is realized by sharing one coil part of the power transmission coil and the power reception coil.

  These frequency settings can select parameters that are not subject to mutual interference. Therefore, there is no influence that the feed system fluctuates. Furthermore, since an independent transmission system is realized, original high-speed data transmission is possible, and although this information is also non-contact, a resonant system is realized, so that highly confidential data transmission / reception becomes possible.

  Claim 1 describes a signal transmission method from the power receiving side to the power transmission side, and claim 2 describes signal transmission in the opposite direction.

  The invention described in claim 3 proposes a structural combination shape according to the inventions of claims 1 and 2. According to the structure of this claim, it is a proposal to divide and use the integrated concentric coil for power feeding and signal transmission.

  In this proposal, a proposal is made to use the outer peripheral portion of the entire coil as a signal transmission coil. By doing so, there is an advantage that a large mutual inductance of the signal transmission system can be obtained.

It is a signal transmission conceptual diagram of the non-contact electric power feeding system seen in patent documents. It is an outline of primary and secondary circuit systems for non-contact power feeding. It is a block diagram of the non-contact electric power feeding system by this invention. It is a structural example of a signal transmission / reception part. It is an example of the frequency characteristic of a signal receiving part. This is a method for realizing a coil antenna.

BEST MODE FOR CARRYING OUT THE INVENTION

  In general, as shown in Non-Patent Document 1, there are four types of non-contact power feeding methods, including a combination of series and parallel. This circuit block diagram is shown in FIG. The explanatory material this time shows examples of primary series and secondary series, but this is not restrictive.

  FIG. 3 shows a block diagram of a non-contact power feeding circuit according to the present invention. The configuration of the main circuit portion of FIG. 3 is the same as that of the known example shown in FIG. 1, but the present invention divides the coils 33 and 38 having the power transmission / reception unit and uses them for power feeding and signal transmission. is there. This makes it possible to integrally form the coil portion. This will be described below with reference to the drawings.

  In FIG. 3, reference numeral 30 denotes a power supply transmitter that drives a power transmission coil 332 through a series capacitor 31. This shows a non-contact power feeding system in which power is supplied to a load 35 via a series capacitor 36 from a power receiving coil 382 magnetically coupled thereto. 32 and 37 in the figure collectively represent series resistance elements of the circuit system.

In this system, the resonance frequency of the power transmission side and the power reception side is
This is determined by f = 1 / 2π√LC and is matched. L and C correspond to 31 and 332 on the power transmission side and 36 and 382 on the power reception side, respectively.

  Refer to Non-Patent Document 1 for the relational expression of resonance frequency and L, C by the primary-secondary coupling method shown in FIG.

  The feature of the present invention is that the coil is divided and used as described above. The coils 331, 332 and 381, 382 are formed by sandwiching taps obtained by dividing the coils 33, 38, respectively. Of these, 332 and 382 are used as power supply coils, and 331 and 381 are used for signal transmission.

  The circuit of the signal transmission system is configured to be coupled to the signal transmission unit 39 and the signal reception unit 34 from these tap positions, respectively.

  In this figure, since the signal transmission from the power receiving side is mainly described, the signal transmitting unit is the power receiving side and the signal receiving unit is the power transmitting side. However, if information transmission in the reverse direction is required, these circuits Obviously, this can be achieved by reversing the connection.

  Here, a circuit portion for the signal transmission is extracted and displayed in FIG. In this example, the signal transmission circuit 45 is connected to the power receiving side, and is connected to the signal transmission coil 381 through the capacitor 46 in series.

  Similarly, on the signal receiving side, the signal receiving coil 331 is connected to the signal receiving unit via the series capacitor 41. The description of 44 filter elements arranged in the middle will be described later.

42 and 47 in FIG. 4 collectively show the series equivalent resistances of the respective circuit portions. The resonance frequency on the transmission side and reception side of the system is determined by f = 1 / 2π√LC, and these are matched. .
Here, L and C are 381 and 46 and 331 and 41, respectively. The 44 elements are determined by constants that are not involved in this basic frequency determination.

  Here, the signal transmission circuit method is also described as a primary serial-secondary serial method, but all four methods shown in FIG. 2 are possible. Further, refer to Non-Patent Document 1 for the relationship between the resonance frequency and C and L at this time.

4 will be described in detail with reference to FIG. In the first place, in this system, the power transmission energy is overwhelmingly large, and there is a possibility that the S / N ratio in the signal receiving unit is deteriorated. For this reason, it is stable to configure a band elimination filter having a large impedance at the power feeding frequency f1 as shown in FIG. 5A using 51 and 52 as necessary and to input it to the signal receiving unit. Of course, the removal band at this time is f1 of the power band.
As shown in FIG. 5B, the final frequency characteristics in the signal receiving unit in such a case can provide a large S / N and enable stable signal transmission.
At this time, since this filter is designed to separate the power feeding frequency and the signal transmission frequency, there is almost no influence.

  FIG. 6 illustrates how to use an actual antenna coil. Reference numerals 61 and 62 denote concentric power transmitting / receiving antennas. It is appropriate to separate the power feeding frequency and signal transmission frequency areas as much as possible even in terms of interference. For this reason, the number of windings of the signal transmission coil is preferably a very small part.

However, considering the degree of coupling between transmission and reception, it is preferable to increase the mutual inductance of transmission and reception by using the outer periphery as much as possible.
In this example, a method is proposed in which several turns of the outer peripheral portion are used for signal transmission and non-contact power feeding is performed by a large number of internal coil portions. In this case, this connection point is generally connected to the circuit common.

  The contactless power supply device according to the present invention can be applied to a charging system for an electric vehicle, an insulated power supply system for a high voltage section, and the like.

DESCRIPTION OF SYMBOLS 11 Transmitter 12 Transmission control part 13 Detection part 14 Power transmission antenna 15 Power reception antenna 16 Load 17 Resistance 18 Control part 19 Relay 30 Transmitter 31 Capacitor 32 Power transmission side circuit resistance 33 Power transmission side coil 331 Signal reception coil 34 Signal reception part 35 Load 36 Power receiving side capacitor 37 Power receiving side circuit resistance 38 Power receiving side coil 381 Signal transmitting coil 39 Signal transmitting unit 40 Signal detecting unit 41 Signal receiving unit capacitor 42 Signal receiving unit circuit resistance 44 Band elimination filter 45 Signal transmitting circuit 46 Signal transmitting unit capacitor 47 Signal Transmitter circuit resistance 51 Band-rejection filter capacitor 52 Band-rejection filter inductor 61 Power transmission unit antenna configuration 62 Power reception unit antenna configuration

Claims (3)

Non-contact electromagnetic induction type power supply having a power transmission coil, a power transmission side device that supplies power to the power transmission coil, a power reception coil that is electromagnetically coupled to the power transmission coil, and a power reception side device that supplies power to the load from the power reception coil In the system,
The power receiving side device has a signal transmission function, takes out the tap from the middle point of the power receiving side coil, uses the coils on both sides thereof as a power receiving coil and a signal transmission coil,
The power transmission side device has a signal reception function, takes out the tap from the intermediate point of the power transmission side coil, uses the coils on both sides thereof as a power transmission coil and a signal reception coil,
A non-contact power feeding system capable of information communication between mutual bases, wherein magnetic coupling is performed at an independent resonance frequency for power feeding and signal transmission. Non-contact electromagnetic induction type power supply having a power transmission coil, a power transmission side device that supplies power to the power transmission coil, a power reception coil that is electromagnetically coupled to the power transmission coil, and a power reception side device that supplies power to the load from the power reception coil In the system,
The power transmission side device has a signal transmission function, takes out the tap from the middle point of the power transmission side coil, uses the coils on both sides thereof as a power transmission coil and a signal transmission coil,
The power receiving side device has a signal receiving function, and taps are taken out from the midpoint of the power receiving side coil, and the coils on both sides thereof are used as the power receiving coil and the signal receiving coil,
A non-contact power feeding system capable of information communication between mutual bases, wherein magnetic coupling is performed at an independent resonance frequency for power feeding and signal transmission.   In the system according to claims 1 and 2, information exchange is possible, characterized in that the coil on the outer peripheral side of the coil having concentric windings is used as the coil for signal transmission. Contactless power supply system.

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