JPH09171542A - Communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely start and quickly end communication by intermittently supplying energy before the detection of an opposite party for communication, continuously supplying energy after the detection of the opposite party and receiving data during the supply of energy. SOLUTION: When energy supply is started, a control part 1100 in a reader 1000 tries to execute communication with a data storage body 20 and judges whether the storage body 10 is a communication enabled state or not based upon a result whether communication more than once can correctly be executed or not. Before the detection of the communication enabled state of an opposite party for communication, energy supply is intermittently executed and the transmission of a communicatable command and the reception of its response are executed during the period of energy supply. After the detection of the communication enabled state of the opposite party, energy supply is continuously executed and the transmission of a command for a data request and the reception of its response are executed during the period of energy supply. Thereby communication can surely be started and quickly be ended.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device, and more particularly, to improvement of a communication device that performs communication and energy supply based on electromagnetic coupling. Examples of fields in which such a communication device is used include a reader / writer capable of reading data from a data storage body without contact, a control base station visited by a local transport vehicle, a mobile robot, or the like.

[0002]

2. Description of the Related Art A schematic configuration of such a communication device and a communication partner device is shown in FIG. 4. In this system, a reader (data reading device) 10 as a communication device is a data storage unit 20 as a communication partner device. The storage data is read by sending and receiving commands and data. Moreover, the reader 10 also supplies energy using electromagnetic coupling for communication so that the data storage body 20 can operate without a battery.

The reader 10 is a control unit 11 mainly composed of a microcomputer which carries out processes such as command transmission and data reception.
And a modulation circuit 12 that generates a transmission signal B by modulating a carrier wave of a predetermined frequency (2ω, for example, several hundred kHz) in accordance with control for command transmission by the control unit 11,
A transmission circuit 13 that electromagnetically converts the transmission signal B to transmit a magnetic signal C to the outside, and a reception circuit 14 that electromagnetically converts the magnetic signal F from the data storage body 20 and generates a reception signal G.
And a demodulation circuit 15 for extracting a predetermined frequency band for reception (for example, a center frequency ω) from the received signal G, further performing detection, etc. to demodulate the received data and send it to the control unit 11. .

The oscillator circuit 13, whose circuit configuration is shown in FIG. 5, has an amplifier for current amplification of the transmission signal B, a coupling capacitor for cutting and transmitting a DC component from the output of this amplifier, and a coupling capacitor for these components. And a parallel resonance circuit whose oscillation state is controlled by a transmission signal B via an amplifier and a coupling capacitor. The parallel resonance circuit includes a transmission coil Ls and a capacitor connected in parallel to the transmission coil Ls, and a switch circuit SW that switches between a conductive state and a cutoff state according to a control signal A from the control unit 11 transmits a signal. It is inserted between the coil Ls and the parallel capacitor, and starts and stops the transmission of the magnetic signal C under the control of the control unit 11.

The circuit configuration of the receiving circuit 14 is also shown in FIG. 5, but in order to perform electromagnetic conversion from the magnetic signal F to the receiving signal G, the receiving coil Lr for receiving the magnetic signal F is shown.
And an amplifier that amplifies the voltage induced in the receiving coil Lr to generate a received signal G. Receive coil Lr
Is the diameter of the transmission coil L from the viewpoint of energy supply priority.
It is smaller than the diameter of s.

The data storage body 20, which is a communication partner of the reader 10, is generally in the form of a coin or a card that is easy to carry, and a power supply circuit in which a series circuit of capacitors and a series circuit of diodes are connected in parallel. Corresponding to the voltage at the other end of the coil L and the transmission unit 21 having the coil L having one end connected to the connection point of the capacitors and the other end connected to the connection point of the diodes and performing electromagnetic conversion. A demodulation circuit 22 that receives a received signal D from the transmitting unit 21 and reproduces a carrier wave by a PLL (phase locked loop) or the like to generate a demodulated signal, and a memory that receives a command based on the demodulated signal and receives the command. An MPU (microcomputer) 23 that performs processing such as sending the stored data of 24 as transmission data, and divides the reproduced carrier wave by 2 (ω) to obtain a transmission carrier wave. Modulation circuit 2 forms to generate a transmit signal E is modulated in accordance with transmission data from the MPU23 this
5 is provided.

Then, the data storage body 20 receives the magnetic signal C
Upon receiving the command, the capacitor of the power supply circuit is charged to secure the energy, and at the same time, the command reception and the data transmission corresponding thereto are performed. Further, in order to omit the crystal oscillator and the like from the viewpoint of downsizing and cost reduction, the clock required for the operation of the MPU 23 or the like is generated based on the oscillation signal of the PLL of the demodulation circuit 22.

Transmission / reception of data and the like and transmission / reception of energy when the reader 10 having such a configuration reads stored data from the data storage body 20 will be described with reference to the communication chart of FIG. 6 and the diagram of FIG. 7. . 6 is a schematic diagram, and the magnetic signal C and the magnetic signal F are shown.
For, the waveforms are shown with a box in the typical portion only, and the amplitude is shown in the width of the box.

Conventionally, transmission / reception of data and the like and transmission / reception of energy have been sequentially performed at different timings. That is, it is performed by sequentially repeating the three-stage processing of only energy transfer, energy transfer + command transmission / reception, and data transmission / reception.

First, in the first stage, the reader 1
At 0, the control signal A is activated (significant) by the control unit 11 to enable the parallel resonance circuit of the transmission circuit 13 to oscillate, and the transmission signal B is maintained in the initial state. Thereby, the transmission coil L of the transmission circuit 13
The magnetic signal C transmitted from s contains only the carrier wave. At this time, in the data storage body 20, when the coil L receives the magnetic signal C, the capacitor of the power supply circuit is charged by the induced current from the coil L, and the power supply voltage Vcc rises. Thus, during this period, only the energy supply from the reader 10 to the data storage body 20 is performed.

Next, in the second stage, the reader 1
At 0, with the control signal A activated,
The transmission signal B is frequency-modulated or phase-modulated by the control unit 11 and the modulation circuit 12 according to the data read command. As a result, the magnetic signal C becomes a carrier wave modulated. At this time, in the data storage body 20, the magnetic signal C
The received induction current from the coil L charges the capacitor of the power supply circuit, and the MPU 23 performs command reception processing. Thus, at this time, in addition to the energy supply from the reader 10 to the data storage body 20, command transmission / reception is also performed.

Then, in the third stage, in the reader 10, the control signal A is made inactive (insignificant) by the control unit 11 and the parallel resonance circuit of the transmission circuit 13 stops oscillating. Then, the magnetic signal C is not transmitted. On the other hand, in the data storage body 20 during this period, the MPU is started from the corresponding address of the memory 24 in response to the acceptance command.
The storage data read by 23 is the modulation circuit 25.
And the magnetic signal F is transmitted by the transmission unit 21 to the reader 10
Sent to In the meantime, in the data storage body 20,
The energy stored in the capacitor in the second stage is consumed, the power supply voltage Vcc drops, and the amplitude of the magnetic signal F also decreases. On the other hand, in the reader 10 that has stopped oscillating and transmitting, the storage data from the data storage body 20 is received by the control unit 11 via the reception circuit 14 and the demodulation circuit 15. Thus, at this time, the data storage 2
Only data transmission from 0 to the reader 10 is performed.

Then, while the reader 10 is repeatedly trying these processes, specifically, while sending the ID request command for confirming the existence of the other party, the data memory 20 approaches and communicates. When entering the feasible range, the ID is returned from the data storage body 20 to the reader 10, and in response to this, the reader 10 determines to start reading the data, and thereafter, these processes are sequentially performed for the addresses A1, A2 ... Repeatedly, the stored data is read from the data storage body 20 by the reader 10 (see FIG. 7). That is, the reader 10 performs energy supply and data reception alternately or sequentially to supply energy using electromagnetic coupling for communication.

[0014]

As described above, the conventional communication device alternately performs the energy supply and the data reception when supplying the energy utilizing the electromagnetic coupling for communication. This is because the transmission capacity of the counterpart communication device such as the body undesirably decreases.
That is, since the terminal voltage of the transmission coil of the partner communication device is dominated by the carrier wave from the communication device, the drive current to the coil is undesirably deformed under the influence of the carrier wave. The data return carrier component contained in the current is reduced, and the transmission capability is reduced.

On the other hand, if energy transfer and data transmission / reception are performed only alternately, the throughput of data transmission is low, which is not preferable. Therefore, even if energy transfer and data transmission / reception are performed in parallel, sufficient transmission capacity is obtained. A counterparty communication device has been invented. This invention is disclosed in detail in the application of Japanese Patent Application No. 7-240195 by the same applicant. However, in the data memory as the other party communication device, the driving current is sent to the transmission coil in either positive or negative direction. It is limited. Therefore, by performing energy transfer and data transmission / reception in parallel by using such a counterpart communication device, it is possible to improve the throughput of data transmission.

However, the processing procedure of the control unit of the conventional communication device as described above is partially changed,
When the energy transfer and the data transmission / reception (by the control unit 110 of the reader 100) are performed in parallel (see FIG. 8), it has been found that the following problems occur in this communication device (FIG. 9, FIG. 9). 10). That is, when the reader 100 and the data storage body 20 approach each other very slowly, the PLL of the demodulation circuit 22 of the data storage body 20 rarely exceeds the frequency f (= 2ω) that is the original catch-up target. Locking to a low f / 2 or f / 4.

This is the power supply voltage Vcc of the data storage body 20.
The VCO of the PLL has not yet risen in the course of slowly rising, but there is a temporary and transient state in which the capture range of the PLL is undesirably low, but in this state the PLL locks up. It happens when it happens.

In such a case, the modulation frequency of the modulation circuit 25 and the operation speed of the MPU 23 become abnormal in the data storage body 20, and the data storage body 20 normally responds to the transmission from the reader 10. Becomes impossible. This needs to be prevented.

To this end, the data storage body 20
It is conceivable to improve the PLL oscillation signal by monitoring the oscillation signal and resetting the PLL when the frequency deviates from a predetermined range. This is because the original frequency f is surely locked after the power supply voltage Vcc has risen sufficiently.

However, although such a straightforward means is easy to conceive, it is not easy to embody it unless a signal as a reference for frequency monitoring exists separately in advance. MPU
Such a reference signal does not exist in the data storage body or the like in which even the clock of (1) is generated based on the oscillation signal of the PLL. However, providing an individual oscillation circuit for generating the reference signal leads to the revival of the crystal oscillator, etc., which has been omitted, and it is inconvenient in terms of cost and mounting.

Therefore, when performing energy transfer and data transmission / reception in parallel in order to improve the throughput of data transmission, the communication device such as the data reading device is modified instead of the counterpart communication device such as the data storage body. The problem is to solve such an inconvenience and ensure communication.

The present invention has been made to solve the above problems, and an object of the present invention is to realize a communication device capable of reliably performing energy supply communication even during data reception.

[0023]

The structure and operation and effect of the first means for solving the above problems will be described below.

[First Solving Means] The communication device of the first solving means (as described in claim 1 at the time of filing the application) is a communication device that performs communication and energy supply based on electromagnetic coupling. The first means for intermittently supplying the energy before the detection of the above, and the second means for continuously supplying the energy after detecting the communication partner and receiving data during the energy supply. It is what

In the communication device of the first solving means as described above, energy is intermittently supplied by the first means until the existence of a communication partner, that is, a communication partner communication device capable of communication is confirmed. Therefore, the communication partner that has entered the communication range becomes operable by receiving energy supply. In particular, when the PLL of the other communication device is locked at an undesirably low frequency (f / 2 or the like) due to a slow approach, the response is not performed correctly and its existence is not confirmed, so the energy in the communication device of the present invention is Due to the intermittent nature of the supply, the energy supply is temporarily stopped. In the meantime, in the partner communication device, energy is consumed and the power supply voltage drops, and accordingly, the PLL cannot maintain the oscillation state, and the lock at a low frequency can be released.

After that, the energy supply is restarted based on the intermittent characteristic of the energy supply in the communication device of the present invention. Then, in the other party communication device that is closer than before, the energy is promptly satisfied as in the case of the sudden approach, the power supply voltage is also quickly raised, and the PLL is low for a low frequency (f / 2 or the like). Before locking, such transients disappear. Accordingly, the communication device of the present invention,
Before reading the stored data, the PLL of the other communication device
Can be locked to the originally desired frequency (f).

When the response from the partner communication device is correctly made, the communication device of the present invention continuously supplies energy by the second means and also receives data during this energy supply. As a result, when reading stored data, energy transfer and data transmission / reception are performed in parallel, so that the throughput of data transmission and the energy supply capability are improved as compared with a conventional device that sequentially performs the same.

In this way, the other party's communication device can be modified by artificially creating a rapid approaching state related to energy supply prior to reading the stored data and performing energy transfer and data transmission / reception in parallel when reading the stored data. Without, the communication can be surely started and completed promptly.

Therefore, according to the present invention, it is possible to realize a communication device which surely performs communication for supplying energy even during data reception.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] In order to implement such a first solution means, in a first embodiment of the present invention, a communication device of the above-mentioned first solution means is provided. And a transmitter coil used for supplying energy are separate, and the receiver coil has a diameter larger than that of the transmitter coil.

By reversing the magnitude relationship between the diameters of the transmitting coil and the receiving coil as in the conventional case, it is possible to reliably receive the data during the energy supply.

That is, since the diameter of the receiving coil further spreads beyond the same state as the transmitting coil and becomes larger than the diameter of the transmitting coil, even if both ends of the transmitting coil are in a low impedance state, the other party's communication is possible. The energy of the magnetic signal from the device will be fairly effectively transferred to the receiving coil. As a result, even when the energy supply is being continued using the small-diameter transmitting coil, the magnetic signal is reliably transmitted to the large-diameter receiving coil, so that data can be reliably received. Since energy is supplied even during data reception and sufficient energy can be supplied even with a small-diameter transmission coil, even if the relationship between the diameters of both coils is reversed from the conventional one, the overall scale of the coil section is small. , It is suppressed to almost the same scale as the conventional one.

Further, since the coils have different diameters, the degree of coupling between them becomes small. Specifically, the magnetic flux induced around the transmitter coil for energy supply is in the opposite direction inside and outside the transmitter coil, but most of it is included inside the large-diameter receiver coil, and the induced voltage in the receiver coil is large. However, they are offset and become smaller. As a result, it is possible to avoid a situation in which the voltage induced in the receiving coil by the transmitting coil becomes too high and the receiving amplifier is destroyed.

Therefore, the data can be received while the energy is being supplied, and the data can be surely received.

[Second Embodiment] A second embodiment of the present invention is the communication device according to the first embodiment, wherein the transmitting coil and the receiving coil are the same on a printed circuit board. It is characterized in that the pattern is formed substantially concentrically on the surface.

As a result, even when a general printed circuit board having double-sided wiring is used, the wiring can be pulled out by utilizing the back surface of the coil forming surface, so that mounting is easy and inexpensive.

[Third Embodiment] As a modulation method in communication based on electromagnetic coupling, amplitude shift keying (A
SK), frequency shift keying (FSK), phase shift keying (PSK), and the like. More specifically, OOK, MASK, QAM, BPSK, QPS.
K, DPSK (differential phase shift keying) and the like.

Further, as communication for confirming the existence of the other party, which is performed prior to communication for requesting / returning data stored in the memory, in addition to requesting / returning ID, requesting test / returning test result or predetermined M series Communication such as request and return of etc. (pseudo random series) can be mentioned.

[Fourth Embodiment] Communication and energy based on electromagnetic coupling is performed with a data storage body that receives energy using electromagnetic coupling for communication and demodulates a received command and the like using a PLL as a communication partner. In the data reading device that supplies the data, the communication with the data storage unit is tried, and it is determined whether or not the data storage unit is in the communication enabled state based on whether or not the data storage unit has been correctly communicated at least once. A detecting means for detecting a communication partner and a command for intermittently supplying the energy and detecting the existence of the communication partner that can communicate with each other before detecting that the communication partner is in the communication possible state. The first means for transmitting and receiving the response during this energy supply, and after detecting that the communication partner is in the communicable state, supply the energy. Performs and continue, and is characterized in that a second means for performing a command transmission for the data request and a data reception of the response in the energy supply.

As described above, by performing the reception during the supply of energy whether before or after the communication partner is detected, the environment and state of the receiving circuit during the receiving operation can be unified, and the circuit scale can be increased. It is possible to avoid complication of circuit design.

[0041]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete configuration of an embodiment of the communication device of the present invention will be described. That is, a system in which the reader 100 as a communication device reads the stored data from the data storage body 20 by transmitting and receiving commands and data based on electromagnetic coupling and also supplies energy by using the electromagnetic coupling for communication. However, the overall configuration diagram is the same as that of the conventional example, so it is omitted. Specifically, the reader 1 in FIGS.
0 is the reader 1000, and the control unit 11 is the control unit 110.
It is only 0, and the diameters of the transmitting coil Ls and the receiving coil Lr are reversed so that the transmitting coil Ls has a small diameter coil and the receiving coil Lr has a large diameter coil. Therefore,
The differences from the conventional method will be mainly described.

In the reader 1000, the transmitting coil Ls and the receiving coil Lr are concentrically patterned on the double-sided printed circuit board housed in the reader 1000, as is conventional, but the wiring from the coil end is used. The withdrawal method is different. Specifically, the small-diameter coil spirally wound several times on the front surface of the printed circuit board is connected to the parallel resonant circuit on the back surface of the printed circuit board and acts as the transmission coil Ls. In addition, a large-diameter coil, which is spirally wound several times on a surface of the printed circuit board surrounding the small-diameter coil, is connected to the receiving circuit 14 on the rear surface of the printed circuit board and acts as a receiving coil Lr. ing. As a result, the diameter of the receiving coil used for receiving data is larger than the diameter of the transmitting coil used for supplying energy.

When the control unit 1100 of the reader 1000 starts supplying energy, the control signal A is activated during the operation period of several tens of ms and is controlled during the rest period of several ms until the ID is correctly returned from the data storage body 20. The microcomputer program has been modified to make signal A inactive. Further, the program is changed so that the command transmission of the ID request and the return ID corresponding thereto are performed in the latter half of the former operation period. In the oscillation circuit 13, the resonance current flows in the small-diameter transmission coil Ls only during the operation period and the magnetic signal C is output, and the magnetic signal C is not output during the idle period. As a result, the reader 1000 intermittently supplies energy using the transmission coil before detecting the communication partner, and also transmits commands and receives responses during this energy supply.

Further, when the ID is correctly returned from the data storage body 20, the control unit 1100 makes a determination to start reading the data, and after that, keeps the control signal A active so as to keep the control signal A active. The computer program has changed. Then, in the transmission circuit 13, the resonance current continues to flow in the transmission coil Ls having a small diameter, and the magnetic signal C is constantly output. The magnetic signal C is also output when the receiving circuit 14 receives the magnetic signal F modulated by the return data and the demodulating circuit 15 and the control unit 1100 receive the data. The magnetic signal F having the frequency ω is discriminated from the magnetic signal C having the frequency 2ω by the demodulation circuit 15. As a result, the reader 1000 continuously supplies energy using the transmission coil after detecting the communication partner, and also performs command transmission using the transmission coil and data reception using the reception coil during the energy supply. It has become a thing.

The specific operation and usage of the system of this embodiment will be described with reference to the drawings.
1 and 2 correspond to FIG. 6 of the conventional example, and are charts showing an example of communication between the reader 1000 and the data storage body 20. FIG. 1 shows an example before detection of a communication partner, and FIG. 2 shows an example after detection of a communication partner. FIG. 3 is a diagram summarizing these and corresponds to FIG. 7 of the conventional example. Note that FIG.
2 is a schematic diagram. Regarding the magnetic signals C and F, the waveforms are shown by enclosing only a typical part in a frame, and the amplitude is shown by the width of the frame. In addition, in each figure, a message transmitted on a carrier of an undesirably low frequency is indicated by a broken line. Further, in FIG. 3, the vertical line of the data storage body 20 along the time axis is bent because it represents a change in the distance from the reader 1000.

In this case, transmission / reception of data and the like and transmission / reception of energy are duplicated, but these are intermittently performed before the detection of the data storage body 20 and continuously performed after the detection. That is, before the detection of the data storage body 20 (see FIG. 1), only the energy transfer, the energy transfer + command transmission / reception, the energy transfer + ID transmission / reception, and the pause four-stage processing are repeated. On the other hand, after the data storage body 20 is detected (see FIG. 2), energy transfer is always performed, and in parallel with this, command transmission / reception and data transmission / reception are alternately performed.

First, in the first stage, the reader 1
At 000, the control signal A is activated by the control unit 1100 to enable the parallel resonance circuit of the oscillation circuit 13 to oscillate, and the transmission signal B is maintained in the initial state. Thereby, the transmission coil Ls of the transmission circuit 13
From which a magnetic signal C is transmitted, and this magnetic signal C contains only a carrier wave. At this time, in the data storage body 20, when the coil L receives the magnetic signal C, the capacitor of the power supply circuit is charged by the induced current from the coil L, and the power supply voltage Vcc rises. Thus, during this period, the reader 1000
To the data storage body 20 from only.

Next, in the second stage, the reader 1
At 000, the control signal A is kept active, and in this state, the control unit 1100 and the modulation circuit 12 frequency-modulate or phase-modulate the transmission signal B according to the data read command. As a result, the magnetic signal C becomes a carrier wave modulated. At this time, in the data storage body 20,
The capacitor of the power supply circuit is charged by the induced current from the coil L that receives the magnetic signal C, and the demodulation circuit 2
When the MPU 23 receives the demodulated signal of 2, the command reception process is performed. Thus, at this time, the reader 100
In addition to the energy supply from 0 to the data storage body 20,
Commands are also transmitted and received from the reader 1000 to the data storage body 20. However, in order for the command reception in the data storage body 20 to be normally performed, the PL of the demodulation circuit 22 must be
L must be locked at frequency f (= 2ω).

Thereafter, in the third stage, in the reader 1000, the control signal A is still kept active by the control section 1100, and in this state, the transmission signal B is kept.
Are held in the initial state or some other constant state. Therefore, as in the first stage, energy transfer from the reader 1000 to the data storage body 20 is performed. In the meantime, in the data storage unit 20, the memory 24 is responsive to the acceptance command.
The storage data and ID read by the MPU 23 from the corresponding address of (1) are converted into the magnetic signal F by the modulation circuit 25 and the transmission unit 21, and are sent to the reader 1000. In order for this transmission to be done normally, the PL of the demodulation circuit 22
It is necessary that L is locked at frequency f.

During this third stage, the data storage 20
Then, the energy stored in the capacitor in the first and second stages is consumed to drive the coil L, and the power supply voltage V
Although cc drops, not only consumption but also charging continues, so the drop in power supply voltage Vcc is gentler than before. The amplitude of the magnetic signal F does not easily decrease. On the other hand, in the reader 1000, the storage data from the data storage body 20 passes through the receiving circuit 14 and the demodulation circuit 15 and the control unit 1
Accepted by 100. Thus, at this time, in addition to the energy supply from the reader 1000 to the data storage body 20, data transmission / reception from the data storage body 20 to the reader 1000 is performed. However, unless the PLL of the demodulation circuit 22 in the data storage body 20 is locked at the frequency f, the return ID and data cannot be correctly demodulated from the magnetic signal F.

Finally, in the fourth stage, in the reader 1000, the control signal A is made inactive by the control unit 1100 and the parallel resonance circuit of the transmission circuit 13 stops oscillating. Then, the magnetic signal C is not transmitted. During this time, in the data storage body 20, the MPU 23 or the like performs a process of waiting for a command from the reader 1000, and further energy is consumed. Then, at the end of the quiescent period, in the data storage unit 20, P of the demodulation circuit 22 is set.
The LL or the like cannot stop its operation and stops. Thus, at this time, the PLL in the data storage body 20 stops oscillating and the lock is released.

Then, the communication between the reader 1000 and the data storage body 20 is performed in the following procedure based on the processing of each of these stages.

Until the reader 1000 correctly receives the ID from the data storage 20, that is, until the communication partner is detected, the ID request command and the ID return transmission / reception are first, second, third. The processing of the fourth stage is repeated. In this way, the power supply from the reader 1000 to the data storage body 20 is intermittently performed along with the detection of the communication partner. As a result, when the PLL of the data storage body 20 is locked at an undesired frequency in the first to third stages, the lock is released in the fourth stage and the retry is performed (see FIG. 1).

Further, when the PLL of the data storage body 20 can be locked to an appropriate frequency in the first to third stages and the reader 1000 correctly receives the return ID, that is, after detecting the communication partner, the process moves to the fourth stage. Without
Only the processes of the second and third stages are repeated. This process is repeated a required number of times until the reading of the stored data from the data storage body 20 by the reader 1000 is completed. In this way, the data reading is continuously performed during the continuous supply of energy, whereby the process is completed promptly.

As has been clarified in the above description, the reader 1000 performs energy supply and data reception in parallel to supply energy using electromagnetic coupling for communication. Moreover, even before the communication partner is detected, even if the data storage body that demodulates a received command or the like using the PLL is a communication partner by supplying energy intermittently,
The communication partner can be detected and communication can be started. Further, after the communication partner is detected, the data can be read quickly by the continuous processing, and moreover, the data can be surely read by increasing the diameter of the receiving coil to enhance the receiving ability.

If the data memory 20 can be charged only by a command for confirming the presence of the other party such as an ID request,
The energy supply stage prior to command transmission can be omitted. Further, instead of providing a pause period for every series of stages of command transmission and subsequent data reception, a pause period may be provided after repeating a series of stages of command transmission and data reception a plurality of times. .

Further, when the return data length of the data storage unit 20 is lengthened or the transmission capability is increased to consume a large amount of energy during the return data transmission, the second, third transmission is also performed during the data reading after the communication partner is detected. The processing of the first stage may be repeated in addition to the processing of the stage, but since energy is continuously supplied, the period of the first stage can be made shorter than in the conventional case even in that case.

[0058]

As is apparent from the above description, in the communication device according to the first solution of the present invention, prior to the reading of the stored data, the sudden approach state regarding the energy supply is artificially created and the stored data is stored. By performing the energy transfer and the data transmission / reception in parallel at the time of reading, it is possible to surely start the communication and quickly complete the communication. Therefore, there is an advantageous effect that communication for continuously supplying energy can be reliably performed even during data reception.

[Brief description of the drawings]

FIG. 1 is a communication chart with a data storage body in an embodiment of a communication device of the present invention.

FIG. 2 is a continuation thereof.

FIG. 3 is a diagram thereof.

FIG. 4 is a block diagram showing a schematic configuration of a conventional communication device.

FIG. 5 is a block diagram of the transmission unit.

FIG. 6 is a communication chart thereof.

FIG. 7 is a diagram thereof.

FIG. 8 is a normal communication chart with a data storage unit for a communication device that supplies energy even when receiving data.

FIG. 9 is a communication chart when the PLL is abnormally locked.

FIG. 10 is a diagram when the PLL is abnormally locked.

[Explanation of symbols]

 10 reader (data reading device; communication device) 11 control unit 12 modulation circuit 13 transmission circuit (electromagnetic conversion circuit; transmission unit) 14 reception circuit (electromagnetic conversion circuit; transmission unit) 15 demodulation circuit 20 data storage unit (counterpart communication device; 21) Transmission unit (electromagnetic conversion circuit; transmission / reception circuit) 22 Demodulation circuit 23 MPU (microcomputer) 24 Memory 25 Modulation circuit 100 Reader (data reading device; communication device) 110 Control unit 1000 Reader (data reading device; communication device) ) 1100 control unit

Claims (1)

[Claims] 1. In a communication device for performing communication and energy supply based on electromagnetic coupling, first means for intermittently supplying the energy before detection of the communication partner, and continuous supply of the energy after detection of the communication partner. And second means for receiving data during this energy supply.