JP5320796B2 - Power feeding system, power feeding device and power receiving device - Google Patents

Description

  The present invention belongs to a technical field of a power feeding system, a power feeding device, and a power receiving device, and more specifically, a power feeding system that transmits power in a non-contact manner using an electromagnetic induction phenomenon, and a power feeding device that constitutes the power feeding system. It belongs to the technical field of power receiving devices.

  2. Description of the Related Art Conventionally, research on a power supply system that supplies power in a non-contact manner, such as a charger corresponding to a handset of a home phone, has been actively conducted.

Here, as a background art related to the present invention as the power supply system, for example, there is one disclosed in Patent Document 1 below. In the power supply system disclosed in Patent Document 1, the primary coil provided in the power supply module and the secondary coil provided in the power reception module are arranged in close proximity to each other, and an electromagnetic induction phenomenon occurs between the coils. As well as transmitting electric power, data such as “full charge information” is transmitted.
JP 2006-141170 A (for example, FIG. 2 etc.)

  However, the above-described Patent Document 1 has no specific description of a so-called modulation method that is normally required for data transmission in the power supply system.

  Further, in the power feeding system disclosed in Patent Document 1, when transmitting data in parallel with power, a carrier signal set in advance using a signal corresponding to power and a signal corresponding to data is used. Each of them is separately modulated and transmitted. For this reason, it is necessary to generate and use three signals for convenience in the power supply system, resulting in a problem that the configuration of the power supply system becomes complicated.

  Therefore, the present invention has been made in view of the above problems, and an example of the problem is a power supply system that transmits power and data (information) in a contactless manner using an electromagnetic induction phenomenon. To provide a power feeding system capable of transmitting the power and data while simplifying the configuration as well as a power feeding device and a power receiving device constituting the power feeding system.

In order to solve the above-described problem, the invention according to claim 1 is a power feeding system including a power feeding device and a power receiving device that exchange power and information in a non-contact manner using an electromagnetic induction phenomenon. A pulse signal generating means such as an oscillating unit that generates a pulse signal in which a power supply pulse continues at a duty ratio corresponding to the power to be supplied, and an information signal is switched on / off according to the content of the information to be transmitted An information signal generating means such as a data generation unit for generating the information signal having an information carrying period and an information non-bearing period in which the information signal is not carried and the information signal is at a certain level; and the generated pulse signal Is combined with the pulse signal and the generated information signal to generate a combined signal, and a combined signal generating means such as a combining unit and the electromagnetic induction phenomenon In a power supply means such as a feeding head for feeding a composite signal said generated in the power receiving device, in response to a difference between the information unsupported period and the information bearing period, to allow feeding said power needed A duty ratio control means such as an oscillating unit for controlling the duty ratio, and the power receiving device receives power from a power receiving head or the like that receives the fed composite signal in a non-contact manner using the electromagnetic induction phenomenon. Separating means such as a power receiving head for separating the pulse signal and the information signal from the received combined signal; and a power signal generating means such as a rectifier for generating a power signal from the separated pulse signal; Information extraction means such as a low-pass filter for extracting the information from the separated information signal.

Therefore, when power and information are exchanged without contact using electromagnetic induction, an information signal is transmitted by regarding the pulse signal corresponding to the power as a carrier wave. The power and information can be exchanged while simplifying the configuration of the power feeding system as compared with the case of exchange.
In addition, the duty ratio in the pulse signal is controlled so that the required power can be fed in response to the difference between the information carrying period and the information non-bearing period in the information signal, so that the necessary power can be transmitted effectively. In addition, information can be transmitted.

In order to solve the above problems, the invention according to claim 2, in the power supply system of claim 1, wherein the duty ratio control means, as the information bearing periods for the information unsupported period is long The duty ratio is controlled to be relatively large.

  Therefore, since the duty ratio is controlled so that the duty ratio becomes relatively larger as the information carrying period becomes longer than the information non-bearing period, even if the information non-bearing period during which power is transmitted in the composite signal becomes shorter Necessary power can be exchanged.

In order to solve the above problem, the invention according to claim 3 is the power feeding system according to claim 1 or 2 , wherein the power feeding means and the power receiving means include coil means for using the electromagnetic induction phenomenon. Each of the coil means in the power receiving means is formed coaxially with the power receiving coil means for receiving the component of the pulse signal in the fed composite signal, and the power receiving coil means, Information receiving coil means for receiving the component of the information signal in the fed composite signal.

  Therefore, since the coil means in the power receiving means is formed from the power receiving coil means and the information receiving coil formed coaxially with the power receiving coil means, the power receiving means can be reduced in size and space. Can be realized.

In order to solve the above problem, an invention according to a fourth aspect is the power feeding device included in the power feeding system according to any one of the first to third aspects, wherein the pulse signal generating unit and The information signal generation means, the combined signal generation means, the power supply means, and the duty ratio control means .

Therefore, when power and information are transmitted in a non-contact manner using electromagnetic induction, an information signal is transmitted by regarding the pulse signal corresponding to the power as a carrier wave. The power and information can be transmitted while simplifying the configuration of the power feeding system as compared with the case of giving and receiving.
In addition, the duty ratio in the pulse signal is controlled so that the required power can be fed in response to the difference between the information carrying period and the information non-bearing period in the information signal, so that the necessary power can be transmitted effectively. In addition, information can be transmitted.

In order to solve the above-described problem, the invention according to claim 5 is the power receiving device included in the power feeding system according to any one of claims 1 to 3 , wherein the power receiving unit, Separation means, the power signal generation means, and the information extraction means.

Therefore, when power and information are received in a non-contact manner using electromagnetic induction, the pulse signal corresponding to the power is regarded as a carrier wave and an information signal is received. Therefore, power and information are separately used using a carrier wave. The power and information can be received while simplifying the configuration of the power feeding system as compared with the case of giving and receiving.
In addition, the duty ratio in the pulse signal is controlled so that the required power can be fed in response to the difference between the information carrying period and the information non-bearing period in the information signal, so that the necessary power can be transmitted effectively. In addition, information can be transmitted.

According to the present invention, when power and information are exchanged without contact using an electromagnetic induction phenomenon, an information signal is transmitted by regarding a pulse signal corresponding to the power as a carrier wave. The power and information can be exchanged while simplifying the configuration of the power feeding system as compared with the case of exchanging and information.
In addition, the duty ratio in the pulse signal is controlled so that the required power can be fed in response to the difference between the information carrying period and the information non-bearing period in the information signal, so that the necessary power can be transmitted effectively. In addition, information can be transmitted.

  Next, the best mode for carrying out the present invention will be described with reference to FIGS. The embodiment described below is an embodiment when the present invention is applied to a power feeding system in which a power feeding device and a power receiving device are connected in a non-contact manner using an electromagnetic induction phenomenon.

  FIG. 1 is a block diagram showing a schematic configuration of the power feeding system according to the embodiment, and FIGS. 2 and 3 are timing charts showing waveform examples according to the power feeding system.

  As illustrated in FIG. 1, the power feeding system S according to the embodiment includes a power feeding device TM and a power receiving device RV. Then, electric power is supplied from the power feeding device TM to the power receiving device RV in a non-contact manner using an electromagnetic induction phenomenon.

  The power supply apparatus TM includes a DC power source B, an oscillation unit T as a pulse signal generation unit and a duty ratio control unit, a data generation unit D as an information signal generation unit, and a synthesis unit M as a synthesis signal generation unit. The power supply head TH as a power supply means and a counter detection unit DT are configured. Further, the power receiving device RV includes a first power receiving head RH1 as a power receiving means and a separating means, a rectifying unit BG as a power signal generating means, a power output terminal OP, and a second power receiving head RH2 as a power receiving means and a separating means. And a low-pass filter L as information extracting means and a data output terminal OD.

  Next, the operation of the power feeding apparatus TM will be described using FIG. 1 and FIG.

  The DC power source B in the power supply apparatus TM generates a DC voltage / current having a preset voltage value (for example, 12 volts) and a current value (hereinafter, the DC voltage / current is simply referred to as DC power). Output to the oscillator T. As a result, the oscillation unit T is based on the DC power output from the DC power supply B, and the power signal Sp (having a duty ratio set experimentally in advance, for example, corresponding to the value of the power to be transmitted to the power receiving device RV. 2) (see the third stage from the top in FIG. 2) and output to the synthesis unit M. As an example of the duty ratio, for example, a duty ratio corresponding to 238 kilohertz is converted into a frequency. The oscillation unit T is configured to be able to change the duty ratio of the power signal Sp according to a difference (for example, a ratio between the two) between a data on period Ton and a data off period Toff in a data signal Sin described later.

  On the other hand, the data generation unit D generates, for example, the data signal Sin that carries data that is input from the outside and is to be transmitted to the power receiving device RV together with power, and outputs the data signal Sin to the combining unit M.

  Here, as shown in the uppermost part of FIG. 2, the data generation unit D according to the embodiment uses, for example, a data signal Sin corresponding to 9600 bps (bit per second, frequency 4.8 kilohertz). When the on / off (or “HIGH” / “LOW”, hereinafter the same) is switched corresponding to the content (this period is referred to as a data on period Ton), no data is carried, for example, on (“HIGH”). The data signal Sin is generated so that the period of maintaining the level of () (the period is referred to as the data off period Toff) appears alternately. In the case illustrated in FIG. 2, the ratio between the length of the data on period Ton and the length of the data off period Toff is 1 to 1.2.

  In the synthesizer M to which the power signal Sp and the data signal Sin are respectively input, the data signal Sin is inverted to be an inverted data signal Sinv shown in the second stage from the top of FIG. 2, and then the inverted data signal Sinv and power A process of adding the signal Sp is performed. As a result, the combining unit M generates a combined signal Sm (see the fourth stage from the top in FIG. 2) in which the power signal Sp is superimposed on the ON period (“HIGH” period) of the data signal Sin. Is output.

  Here, the portion of the composite signal Sm carrying the power signal Sp will be specifically described by enlarging the portion indicated by the reference numeral “100” in FIG. 2 on the time axis. HIGH ”)), the combined signal Sm is switched on / off at a duty ratio DY corresponding to the power signal Sp (in the example illustrated in FIG. 2, the duty ratio DY is approximately 24.8%). .

  Next, the power feeding head TH that has received the combined signal Sm includes a core (not shown) and a coil wound around the core a predetermined number of times (for example, 12 times). The power feeding head TH is connected in a non-contact and electrical manner by the electromagnetic induction phenomenon between the first power receiving head RH1 and the second power receiving head RH2 in the power receiving device RV, and the DC power input as the composite signal Sm. And the data are supplied to the first power receiving head RH1 and the second power receiving head RH2. At this time, the power feeding head TH is opposed to the first power receiving head RH1 and the second power receiving head RH2 facing the power feeding head TH and close to a preset distance (for example, 0.7 millimeters). The power feeding operation is executed only when detected by the detection unit DT.

  Next, operation in the power receiving device RV will be described with reference to FIGS. 1 and 2.

  The first power receiving head RH1 and the second power receiving head RH2 in the power receiving device RV have one core (not shown) as a common core, and are wound around the common core and the common core in a coaxial manner a predetermined number of times. It consists of a coil. At this time, the number of turns of the coil is, for example, 6 times for the first power receiving head RH1 for power reception and 8 times for the second power receiving head RH2 for data reception. The first power receiving head RH1 and the second power receiving head RH2 are both non-contact and electrically connected to the power feeding head TH in the power feeding device TM by electromagnetic induction.

  In this configuration, the first power receiving head RH1 receives the combined signal Sm transmitted from the power feeding head TH and outputs it to the rectifying unit BG. As a result, the rectification unit BG performs preset rectification processing, amplification processing, and the like on the received composite signal Sm, and extracts DC power Spw corresponding to the DC power carried in the composite signal Sm. Output to the power output terminal OP. The DC power Spw is supplied from the power output terminal OP to an external device (not shown).

  On the other hand, the second power receiving head RH2 similarly receives the combined signal Sm transmitted from the power feeding head TH and outputs it to the low-pass filter L. Here, the low-pass filter L may be a comparator whose cut-off frequency is set to, for example, 40 kilohertz, and that only passes the synthesized signal Sm having a voltage value equal to or lower than a preset threshold value (for example, 4 volts). It is set to work. As a result, the low-pass filter L removes the component corresponding to the power signal Sp from the received combined signal Sm. For example, the second stage from the bottom of FIG. 2 and the bottom stage (the second stage from the bottom is the code at the bottom stage). A data output signal Sdo as illustrated in FIG. 10 is generated by enlarging the portion indicated by “101” on the time axis, and is output to the data output terminal OD. The data is output from the data output terminal OD to an external device (not shown).

  As described above, in the power feeding system S according to the embodiment, when the power and the data are simultaneously transmitted from the power feeding apparatus TM to the power receiving apparatus RV, the power signal Sp is used as a carrier wave, and this is used as the content of the data signal Sin. By modulating in response, the power and data are exchanged simultaneously. At this time, since the data off period Toff is provided in the data signal Sin, sufficient power can be transmitted together with the data.

  Further, since the duty ratio in the power signal Sp is made variable according to the difference (for example, ratio) between the data-on period Ton and the data-off period Toff, the necessary power can be transmitted together with the data even if the data-off period Toff is short. become. In this case, it is usually preferable to increase the duty ratio of the power signal Sp as the data off period Toff becomes shorter.

  In the embodiment described with reference to FIGS. 1 and 2, the power signal Sp is carried while the data signal Sin is on. In addition to this, as illustrated in FIG. The power signal Sp can also be carried during the off (“LOW”) period. At this time, the portion of the combined signal Sm that carries the power signal Sp becomes a portion other than the portion of the combined signal Sm described with reference to FIG. 2 (see the fourth row from the top in FIG. 3). For this reason, as illustrated in the lowermost stage of FIG. 3, it is necessary to invert the data output signal Sdo in the final stage of the power receiving device RV to produce an inverted data output signal Sdov and to output it to the data output terminal OD.

  Next, specific circuit configurations of the power supply apparatus TM and the power reception apparatus RV according to the embodiment will be exemplified with reference to FIG.

  First, a specific circuit configuration relating to the power supply apparatus TM will be described with reference to FIG.

  As shown in FIG. 4, the power supply device TM includes, for example, a DC power source B to which a DC voltage of 12 volts is applied, an IC (Integrated Circuit) as the oscillation unit T, a transistor as the synthesis unit M, a counter detection In addition to the photodiode as the part DT and the feeding head TH, the capacitors 1 to 17 and 29 and 30, the resistor groups 40, 41 and 72, the resistors 42 to 54 and 60 to 63 and 67 to 71, A switch group 73, transistors 80 to 87 and 89, ICs 91 and 92, a thyristor 93, and a diode 201 are connected as illustrated in FIG. Among these, the capacitors 29 and 30, the resistors 60 and 61, the resistor group 72, the switch group 73, the transistor 89, and the IC 92 are connected as illustrated in FIG. ing.

  On the other hand, the power receiving device RV includes the first power receiving coil RH1 and the second power receiving coil RH2, the rectifying unit BG composed of four diodes, a low pass filter L composed of an IC 90, capacitors 33 and 34, resistors 59 and 64 to 66. In addition to the power output terminal OP and the data output terminal OD, capacitors 18 to 28 and 31 and 32, resistors 55 to 58, transistors 88 and 94, and a diode 200 are illustrated in FIG. Are connected and configured.

  It was experimentally confirmed that the DC power having a voltage of 5 volts and a current of 22.3 milliamperes can be extracted from the power output terminal OP by the power feeding system S having the circuit configuration shown in FIG.

  As described above, according to the configuration of the power supply system S according to the embodiment and the examples, when power and data are exchanged in a contactless manner using the electromagnetic induction phenomenon, the power corresponding to the power Since the data signal Sin is transmitted with the signal Sp regarded as a carrier wave, the power and data can be exchanged while simplifying the configuration of the power feeding system S compared to the case where the carrier wave is separately used to exchange power and data. Can do.

  Further, since the duty ratio in the power signal Sp is controlled so that the required power can be supplied in accordance with the difference between the data on period Ton and the data off period Toff in the data signal Sin, the necessary power is effectively used. Data can also be transmitted while transmitting.

  Further, since the duty ratio is controlled so that the duty ratio becomes relatively larger as the data on period Ton becomes longer than the data off period Toff, the data off period Toff in which power is transmitted in the composite signal Sm becomes shorter. But you can send and receive the necessary power.

  Furthermore, since the power receiving head RH in the power receiving device RV is formed from the first power receiving head RH1 and the second power receiving head RH2 formed coaxially with the first power receiving head RH1, Can be reduced in size and space.

  As described above, the present invention can be used in the field of power feeding systems, and particularly when applied to the field of power feeding systems in which a power feeding device and a power receiving device are connected in a contactless manner to transmit power. A remarkable effect is obtained.

1 is a block diagram illustrating a schematic configuration of a power feeding system according to an embodiment. It is a timing chart (I) which shows the example of a waveform in the electric power feeding system concerning an embodiment. It is a timing chart (II) which shows the example of a waveform in the electric power feeding system which concerns on embodiment. It is a circuit diagram which illustrates the circuit composition of the electric supply system concerning an embodiment.

Explanation of symbols

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34 Capacitor 40, 41, 72 Resistance group 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54 , 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71 Resistance 73 Switch group 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 94 Transistor 90, 91, 92 IC
93 Thyristor 200, 201 Diode 201
S Feeding System B DC Power Supply T Oscillator D Data Generator L Low Pass Filter M Synthesizer TM Feeder RV Power Receiver TH Feed Head DT Opposite Detector BG Rectifier OP Power Output Terminal OD Data Output Terminal RH1 First Power Receiver RH2 First 2 Power receiving head

Claims (5)

In a power feeding system composed of a power feeding device and a power receiving device that exchanges power and information in a non-contact manner using electromagnetic induction,
The power supply device
Pulse signal generating means for generating a pulse signal in which a power supply pulse continues at a duty ratio corresponding to the power to be supplied;
Generates an information signal having an information carrying period in which on / off of the information signal is switched according to the content of the information to be transmitted, and an information non-bearing period in which the information signal is at a certain level without carrying the information Information signal generating means for
Considering the generated pulse signal as a carrier wave, combining the pulse signal and the generated information signal to generate a combined signal;
A power feeding means for feeding the generated composite signal to the power receiving device in a non-contact manner using the electromagnetic induction phenomenon;
In response to the difference between the information carrying period and the information non-carrying period, duty ratio control means for controlling the duty ratio so that the required power can be supplied,
With
The power receiving device is:
Power receiving means for receiving the fed composite signal in a non-contact manner using the electromagnetic induction phenomenon;
Separating means for separating the pulse signal and the information signal from the received composite signal;
Power signal generating means for generating a power signal from the separated pulse signal;
Information extracting means for extracting the information from the separated information signal;
A power supply system comprising: The power feeding system according to claim 1,
The power supply system, wherein the duty ratio control means controls the duty ratio so that the duty ratio becomes relatively larger as the information carrying period becomes longer than the information non-bearing period . In the electric power feeding system according to claim 1 or 2,
The power feeding means and the power receiving means are each provided with coil means for using the electromagnetic induction phenomenon,
The coil means in the power receiving means is
Power receiving coil means for receiving a component of the pulse signal in the fed composite signal;
Information receiving coil means that is coaxially formed with respect to the power receiving coil means and receives the component of the information signal in the fed composite signal;
A power supply system characterized by being formed from . The power supply apparatus included in the power supply system according to any one of claims 1 to 3 ,
The pulse signal generating means;
The information signal generating means;
The synthesized signal generating means;
The power supply means;
The duty ratio control means;
Feed device, characterized in that it comprises a. The power receiving device included in the power feeding system according to any one of claims 1 to 3 ,
The power receiving means;
The separating means;
The power signal generating means;
The information extraction means;
Power receiving apparatus comprising: a.

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