JPH07105330A - Data transmitter - Google Patents

Abstract

PURPOSE:To supply and receive sufficient power without a large sized electromagnetic coupling section for supplying power by allowing a transmitter main body to generate a signal whose power is superimposed on a data signal and supplying the power to a portable information recording medium via a data transmission reception coil. CONSTITUTION:A transmission data coil 220 and a reception data coil 230 at the side of a reader/writer R/W 2 are connected to a controller 260 respectively via a superimposing modulation circuit 222 and a demodulation circuit 232 and connected to a power driver 211. Then a data output from the controller 260 is pulse-phase-modulated at the circuit 222 and power from the power driver 211 is superimposed on the data and the resulting data are fed in parallel with each transmission data coil 220 via a data driver 221. A reception data coil 130 of the IC card 1 coupled magnetically with the data coil 220 receives a pulse signal being superimposition of data and power in parallel, a demultiplexing demodulation circuit 132 demultiplexes the pulse signal into power and data and the power is supplied to a power supply circuit 112.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises an information recording medium such as a memory card and a device body such as a reader / writer (hereinafter abbreviated as R / W) for writing or reading information using the information recording medium. The present invention relates to a data transmission device.

[0002]

2. Description of the Related Art In recent years, a memory card, which is a type of IC card, has been used as an electronic notebook database, an external storage medium for various personal computers, an additional memory, etc., and its demand and field of use have expanded dramatically. There is.

The method of connecting the memory card to the terminal device can be roughly classified into a pin insertion method and a non-contact method. The former pin insertion method has a feature that signals can be given using, for example, about 68 pins, so that 8-bit or 16-bit parallel data transfer is possible and high-speed reading and writing are performed. ing. However, on the other hand, since the surface of the connector (conductor) is exposed, there are drawbacks such as poor contact due to contamination such as dust and oil, and deterioration of insertion / withdrawal resistance due to miniaturization of pins.

On the other hand, the latter non-contact method does not cause the trouble as in the former because the conductor is not exposed, and has a characteristic that it can be used even in a dirty environment, and is practically used in various fields. .

As a means for supplying electric power and transmitting and receiving signals in a non-contact state, an electromagnetic coupling method or a method using light or radio waves has been proposed. Among them, cost and power consumption are taken into consideration. Now, the electromagnetic coupling method is in practical use.

FIG. 6 is a plan view showing a mounting state of electronic components in a memory card using a conventional electromagnetic coupling system. Shown in the figure is, for example, an SRAM guard that uses an electromagnetic coupling system generally called a sheet coil system.
On the printed circuit board 100, a large sheet coil 101, a plurality of small sheet coils 102a, 102b, 102c, and a memory IC 103 such as SRAM that stores and holds data.
a, 103b, control I for controlling reading and writing of data
C104, a battery 105 for holding the data recorded in the memory ICs 103a and 103b, and the like are mounted.

The large sheet coil 101 is, for example, a coil for receiving electric power and a clock signal to the IC card, and has multiple windings and a large diameter to receive sufficient electric power. The small sheet coils 102a to 102c are, for example, a data receiving coil 102a and a data transmitting coil 102.
b, it functions as the command signal receiving coil 102c. These sheet coils 101 and 102 are formed by the same method as the conductive pattern formed on the printed board 100.

Although not shown, the coil of the terminal device is an IC
When a magnetic field line generated by a coil on the terminal device side is provided at a position facing the coil of the card and the coil of the terminal device interlinks with the coil on the IC card side, an induced current is generated on the coil on the IC card side based on “Rents' law” It is possible to generate and exchange signals.

In such a structure, since all data is exchanged by serial signals, 8 bits and 1 bit are used.
It is disadvantageous in terms of transfer speed as compared with the contact method based on parallel transfer of 6 bits.

Parallel transfer is possible by increasing the number of coils. However, since the area occupied by the sheet coil is generally about 100 mm 2 for the small sheet coil and about 400 mm 2 for the large sheet coil, the sheet coil is used. Increasing the size more than this sacrifices the mounting area of other electronic components and hinders the increase in memory capacity.

FIG. 6 is a plan view showing a mounted state of an electronic component in which the problems of the conventional example shown in FIG. 24 are alleviated (see, for example, Japanese Patent Laid-Open No. 3-232207). In this figure, 106a to 106i are thin film coils, and 107 is a thin film coil module including the thin film coils 106a to 106i.

This structure is intended for parallel transfer of 8 bits, and eight thin film coils 10 for data transmission / reception are used.
6a to 106h and a command signal thin-film coil 106i for receiving one command signal, for a total of nine thin-film coils 1
A thin film coil module 107 having a No. 06 is used.

Thus, the plurality of thin film coils 106a-1.
By using 06i, miniaturization is possible, and 8-bit parallel transfer is possible without increasing the area occupied by the coil.

[0014]

These conventional ones are
When the demand for power consumption increases in the IC card to which power is supplied, in order to supply the power, an electromagnetic coupling unit having a sufficient capacity corresponding to the demand is required. As a result, the electromagnetic coupling unit for power supply is required. The power receiving coil must be large in size, or a large number of small power source electromagnetic coupling power receiving coils must be arranged.

However, in an IC card which is a small device, it is difficult in terms of space to increase the size of the coil and to arrange a large number of power receiving coils as described above, and it is also difficult to use other electronic parts. Since the number and mounting form of the IC cards are also limited, it is disadvantageous in increasing the functionality and capacity of the IC card. An object of the present invention is to provide a data transmission system capable of supplying sufficient electric power without constructing a large-scale electromagnetic coupling unit for supplying electric power.

[0016]

To achieve the above object, the present invention provides a portable information recording medium provided with a plurality of surface data transmitting / receiving coils in parallel, and a data transmitting / receiving coil of the portable information recording medium. A plurality of opposing data transmission / reception coils are provided in parallel, a portable information recording medium is mounted, and an apparatus main body for magnetically coupling and transmitting / receiving a data signal is provided, and between the portable information recording medium and the apparatus main body. In a data transmission device that performs parallel data transmission, the device body is configured to generate a signal in which electric power is superimposed on a data signal and supply the signal to the portable information recording medium via the data transmission / reception coil. It is characterized by that.

[0017]

Since the present invention has the above-described structure, the portable information recording medium and the apparatus body can supply and receive sufficient electric power without enlarging the electromagnetic coupling portion for supplying electric power. it can.

[0018]

Embodiments of the present invention will now be described with reference to the drawings.
FIG. 1 is a block diagram for explaining a data transmission / reception system according to an embodiment. In the figure, 1 is an IC card, which includes a power supply circuit 112, a transmission data coil 120, a data driver 121, a modulation circuit 122, a reception data coil 130,
Data receiver 131, separation / demodulation circuit 132, timing reproduction circuit 140, controller 150, memory 160
And so on. Reference numeral 2 is an R / W for writing and reading data by mounting the IC card 1, and each modulation circuit 12
2. The separation / demodulation circuit 132 is connected to the controller 150, and the data driver 121 and data are also connected.
Data coils 120, 130 through the terminating receiver 131
Respectively connected to.

The superposition modulation circuit 222 and the demodulation circuit 232 on the R / W2 side are connected to the controller 260, and the data driver 221 and the data receiver 2 are connected.
31 is connected to the data coils 120 and 130 respectively, and the demodulation circuit 232 is operated by the correction clock 242 output from the timing correction circuit 241. The controller 260 is, for example, a computer via a signal line 270. Connected to a higher-level information device such as a computer.

Next, a specific operation will be described. R /
A clock CLK240 having a frequency f is applied to the power driver 211 from an oscillator (not shown) incorporated in the controller 260 of W2, and its output pulse is supplied to the demodulation circuit 232 and the superposition modulation circuit 222. It

In data transmission and power transmission from the R / W 2 to the IC card 1, the data output from the controller 260 is subjected to pulse phase modulation by the superposition modulation circuit 222, and the power driver 211 is also provided. The electric power from the above is superposed and applied in parallel to each data coil 220 via the data driver 221.

The data coil 130, which is magnetically coupled to the data coil 220, receives in parallel a pulse in which the power of the data is superposed, is amplified and shaped by the data receiver 131, and is then separated. It is input to the demodulation circuit 132.
In this separation / demodulation circuit 132, power and data are separated,
The power is supplied to the power supply circuit 112 and the timing recovery circuit 140.
To demodulate the data, and the demodulated output is the control signal.
The data is input to the memory 150, data processing is performed in accordance with the data format, and the data is sequentially written to the designated address of the memory 160.

In the power supply circuit 112, the supplied power is rectified and smoothed to form a stable DC voltage, which is supplied as operating voltages (Vcc) 113 and 114 of each part in the IC card 1.

The timing reproduction circuit 140 divides and corrects the supplied power to generate a reproduction clock 141,
The signals are supplied to the modulation circuit 122 and the separation demodulation circuit 132, respectively. In the data transmission from the IC card 1 to the R / W2, the data is read from the designated address of the memory 160,
The controller 150, the modulation circuit 122, the data driver 121, the data coils 120 and 230, the data receiver 231, the demodulation circuit 232, and the controller 260 are operated through a transmission path. This is the same as the data transmission from W2 to IC card 1.

FIG. 2 is a circuit diagram showing an example of a method of superimposing and separating electric power.

Transmitting data coil and receiving data on the R / W2 side
The switching coils 220 and 230 are connected to the controller 260 via the modulation circuit 222a, and are also connected to the controller 260 via the HPF (high-pass filter) 232b and the demodulation circuit 232a. In addition, 22
0 and 230 are connected to a power driver via an LPF (low pass filter) 211a.

On the other hand, the transmission data coil on the IC card side,
The reception data coils 120 and 130 are connected to the controller 150 via a modulation circuit, and the HPF 13
2b, it is connected to the controller through the demodulation circuit 132a. Further, 120 and 130 are connected to the power supply circuit 112 via the LPF 112a.

Next, the operation of this circuit will be described with reference to FIG. FIG. 3A sent from the controller 260.
The data signal shown in (4) is modulated by the modulation circuit 222a.

FIG. 3 supplied from the power driver 211.
The high-frequency component of the waveform as shown in (b) is cut by the LPF 211a.

Both of these signals are electrically superimposed, and a signal having a waveform as shown in FIG. 3C is transmitted.
Given to 20.

On the other hand, on the IC card 1 side, a superimposed current having a waveform as shown in FIG. 3C is induced on the reception data coil 130 by the above signal. This electrical signal is H
Power signal and data are sent through PF132b and LPF112a.
The power supply signal is waveform-shaped in the power supply circuit 112 and supplied to each electric component inside the card in the same manner as when the power supply signal is separated into the data signal and the data signal shown in FIG.

FIGS. 4 and 5 are diagrams showing another example of the power superimposing and separating method. The same parts as those in the previous example are designated by the same reference numerals.

In this embodiment, power transmission coils 210a and 210b, a data transmission / reception coil 220 are provided on the R / W2 side.
230 are arranged on the same core. On the IC card 1 side, the power receiving coil 110 and the data transmitting / receiving coil 1
20 and 130 are arranged. The data transmitting / receiving coils 120 and 130 and the power receiving coil 110 are connected via the rectifier circuit 280 and at the same time via the power supply voltage canceling circuit 290, and the power supply voltage canceling circuit 290 is connected to the control circuit. Is connected to the la 150.

In such a structure, power (FIG. 5 (b))
Is the power transmission coil 210b and the power reception coil 11
Is supplied to the IC card 1 via 0, and is magnetically superimposed on the data signal (FIG. 5 (a)) by the power transmission coil 210b (FIG. 5 (c)). It is supplied to drive 1.

The power sent through the power transmitting coil 210a is rectified by the rectifier circuit 280, and the power supply circuit 1
12 are supplied.

Since the data signal obtained through the data transmitting / receiving coil 130 is a signal superimposed on the power source,
The power supply voltage canceling circuit 290 cancels the power supply signal based on the signal obtained from the power receiving coil 110, extracts the data signal, and controls the signal as shown in FIG. Supply to LA 150.

In this example, the power supply voltage waveform necessary for canceling the power signal is obtained from the separately provided power supply section, but other various methods are conceivable and the present invention is not limited to this. It is not something that will be done.

Although the above embodiments have been described focusing on the IC card, the present invention can downsize the power receiving coil or eliminate the need for the power receiving coil. When it is made into a connector, it is useful because it can be extremely miniaturized.

[0039]

According to the present invention, IC power can be sufficiently supplied without constructing a large-scale electromagnetic coupling portion for supplying power.
It is possible to provide a data transmission method that can be supplied to the terminals.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating an IC card according to an embodiment.

FIG. 2 is a circuit diagram illustrating a first embodiment.

FIG. 3 is a signal waveform diagram illustrating the first embodiment.

FIG. 4 is a circuit diagram illustrating a second embodiment.

FIG. 5 is a signal waveform diagram illustrating a second embodiment.

FIG. 6 is a diagram illustrating a component arrangement of a conventional example.

FIG. 7 is a diagram illustrating a component arrangement of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 IC card 2 Reader / writer 120 Data transmission coil 220 Data transmission coil 130 Data reception coil 230 Data reception coil 112 Power supply circuit 140 Timing reproduction circuit 150 Controller 260 controller -La 211 power driver 241 Timing correction circuit

Claims (1)

[Claims] 1. A portable information recording medium in which a plurality of surface data transmitting / receiving coils are provided in parallel, and a plurality of data transmitting / receiving coils facing the data transmitting / receiving coil of the portable information recording medium are provided in parallel, and portable information recording medium is provided. A data transmission device comprising a recording medium mounted and magnetically coupled to transmit and receive a data signal, wherein parallel data transmission is performed between a portable information recording medium and the device body. A data transmission / reception device characterized in that a signal in which electric power is superimposed on a data signal is generated and is supplied to the portable information recording medium via the data transmission / reception coil. [0000]