JPH08147079A - Data transmitter-receiver - Google Patents

Abstract

PURPOSE: To perform a data transmission with high reliability and to obtain power transmission efficiency which is advantageous and excellent in a miniaturization, in a data transmitter-receiver performing the data reading and writing processings with an external memory for an information equipment main body. CONSTITUTION: By the power supply voltage/carrier clock superposition circuit 34 of a data reader/writer 300, power supply voltage signals (o) and (p) on which carrier clock signals (m) for data transmission synchronization are superposed are connected with power source output terminals 44a and 44b and power source input terminals 45a and 45b, the signals are supplied to a data storage device 400 and the signals are obtained as carrier clock signals (t) via bias and a waveform shaping circuit 37. With the signals, an operation power source Vcc is obtained via a smooth circuit 39. Memory access signals (k) and (r) and memory output signals (s) and (w) are transmitted and received by an electromagnetic guide from each of the corresponding signal transmission parts 31 and 36 via transmission and reception coils 40, 42, 43 and 41, and the signals are demodulated in signal reception parts 35 and 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission / reception device for reading / writing data from / to an electronic information device such as a personal computer with an external expansion memory such as a card type memory.

[0002]

2. Description of the Related Art Conventionally, a card type memory has been used as an external expansion memory for an electronic information device such as a personal computer to increase the storage capacity or to share information with other information devices. ing.

In this case, as portable data storage devices such as the card type memory, there are a data storage device which does not require a backup power source and a data storage device which requires a backup power source, such as an EEPROM or a flash memory. In any of the data storage devices, when data is read from or written in the information equipment body, the drive voltage for the data transmission / reception operation is supplied from the body side.

As such a portable data storage device which does not have a built-in transmission / reception drive power source, a metal electrode terminal or a connector is provided between the information device body for reading and writing the data. There are a contact type in which power is supplied and signals are exchanged, and a non-contact type in which power and signals are transmitted by electromagnetic induction.

FIG. 4 is a block diagram showing the structures of a conventional read / write device (reader / writer) and a data storage device for transmitting and receiving data by a contact method. In this contact-type data transmitter / receiver, any one of the control signal a, the carrier clock signal b, the address signal c, and the data signal d is transmitted between the control unit 1 of the read / write device and the memory unit 3 of the data storage device. Also the corresponding metal terminals 4
It is transmitted and received via a, 5a, 4b, 5b, 4c, 5c, 4d and 5d.

The voltage signal Vcc from the power supply circuit 2 of the read / write device is also supplied to the corresponding metal terminals 4e, 4e.
It is supplied via 5e, 4f, and 5f. Thus, in the contact-type data transmitter / receiver, all the signal lines a, b,
c, d and the power source Vcc are both metal terminals 4a, 5a, 4
b, 5b, 4c, 5c, 4d, 5d, 4e, 5e, 4
Since they are connected via f and 5f, as many signals as possible can be transmitted at the same time as long as the mounting space of the terminals in the read / write device and the data storage device allows, and bidirectional transmission such as the data signal d can be easily performed. There is an advantage.

However, since a large number of electrode terminals are exposed, they are easily damaged by dust, moisture and the like, and a contact failure is likely to occur during repeated attachment / detachment to / from the read / write device. Lines a, b,
If a contact failure occurs at points c and d, there is a drawback that the possibility of writing or reading erroneous data increases.

FIG. 5 is a block diagram showing the structures of a conventional read / write device (reader / writer) and a data storage device for transmitting and receiving data in a non-contact manner. The memory access signal f output from the control unit 10 of the read / write device is a serial signal containing information such as command, address, data, etc., and is modulated for transmission in the signal transmission unit 11 together with the carrier clock e. It is sent to the transmission coils 15 and 14, respectively.

In the data storage device, the signals f and e are applied by electromagnetic induction to the receiving coils 19 and 18 at positions facing the transmitting coils 15 and 14 on the side of the reading / writing device.
Is transmitted, demodulated in the signal receiving unit 22 into the same memory access signal i and carrier clock h as before modulation, and input to the memory unit 25.

The memory output signal j, which is a serial signal containing information such as memory read data in the data storage device, is also read / written from the signal transmitting unit 23 via the transmitting coil 20 by the same transmission method using electromagnetic induction. The signal is sent to the receiving coil 16 of the apparatus, received by the signal receiving section 12, demodulated into a memory output signal g, and read by the control section 10.

Regarding the power supply voltage, on the other hand, the transmission coil 17 is driven by an AC signal generated by the power transmission unit 13 of the reading / writing device to generate an AC voltage in the reception coil 21 of the data storage device by electromagnetic induction. Power receiving unit 2
4, full-wave rectification and smoothing are performed to obtain the power supply voltage Vcc required for the transmission / reception operation of the data storage device.

When the carrier clock can be substituted at the timing of the AC signal for power transmission itself, the transmitter coil 14 and the receiver coil 18 dedicated to the carrier clock can be omitted.

As described above, in the non-contact type data transmitting / receiving apparatus, unlike the contact type data transmitting / receiving apparatus shown in FIG. 4, since there is no metal terminal on the surface, there is no risk of malfunction due to contact failure. However, there is an advantage that highly reliable signal transmission can be performed only by facing the transmitting and receiving coils.

On the other hand, in order to reduce the thickness and cost of the data storage device, a method is used in which the transmission / reception coil is spirally formed on the printed circuit board with a copper foil to form a pattern. At this time, the coil 21 for power transmission / reception requires a considerable number of turns to increase the inductance, but it is difficult to secure sufficient inductance in a limited space.

Further, since the magnetic flux between the transmitting coil 17 and the receiving coil 21 is a spatial transmission, there are many leakage magnetic fluxes, and it is difficult to obtain a large coupling coefficient between the two. Therefore, in this non-contact type data transmission / reception device, although reliable data transmission can be performed without fear of malfunction due to contact failure, power transmission efficiency is poor and consumption of the reading / writing device which is a power supply source is low. Since the electric power becomes large, there is a drawback that it is not practical when it is driven by a battery.

[0016]

Therefore, in the above-mentioned conventional data transmitter / receiver, the reliability of data transmission is high,
Moreover, there is a problem that it is not possible to satisfy all the conditions that it is advantageous for downsizing and that the power transmission efficiency is good.

The present invention has been made in view of the above-mentioned problems, and it is possible to perform highly reliable data transmission, and at the same time, a data transmission / reception device that is advantageous in downsizing and that can obtain good power transmission efficiency. The purpose is to provide.

[0018]

That is, a first data transmission / reception device according to the present invention is for performing data transmission between a data reading / writing device and a data storage device. A superimposing means for superimposing a carrier signal for data transmission synchronization on a power supply voltage, a power supply output terminal for outputting a power supply voltage signal on which the carrier signal is superimposed by the superimposing means, and a carrier signal to be superimposed on the superimposing means. First data transmitting / receiving means for wirelessly transmitting / receiving a data signal in synchronization with each other, the data storage device is input from a power input terminal removably connected to the power output terminal and the power input terminal. A second transmitter / receiver that wirelessly transmits / receives a data signal to / from the first transmitter / receiver in synchronization with a carrier signal driven by a power supply voltage and superimposed on the power supply voltage signal. It is constructed by including and.

The second data transmitting / receiving apparatus according to the present invention is configured such that the carrier signal for data transmission synchronization is a sine wave signal. The data read / write device according to the present invention reads and writes data to and from a separately prepared data storage device, and superimposing means for superimposing a carrier signal for data transmission synchronization on a power supply voltage. And a power supply output terminal for outputting a power supply voltage signal on which the carrier signal is superimposed by the superimposing means, and a transmitting / receiving means for transmitting / receiving a data signal wirelessly in synchronization with the carrier signal superimposed on the superimposing means. It is configured by.

The data storage device according to the present invention is
Data is read and written by a separately provided data reading / writing device, and a power input terminal detachably connected to the power output terminal of the data reading / writing device and from this power input terminal And a transmission / reception unit that wirelessly transmits / receives a data signal to / from the data reading / writing device in synchronization with a carrier signal that is driven by an input power supply voltage and is superimposed on the power supply voltage signal. Is.

[0021]

That is, in the first data transmitter / receiver, the power supply voltage signal on which the carrier clock signal is superposed from the data reading / writing device stores data via the power supply voltage output terminal and the power supply voltage input terminal connected to the power supply voltage output terminal. Since it is supplied to the device, it can be miniaturized without the need for input / output terminals for exclusive use of the carrier clock or the transmission / reception coil, and moreover, efficient power supply can be performed and data signals can be transmitted / received wirelessly by, for example, an electromagnetic induction method. As a result, reliable data transmission / reception processing can be performed without contact failure.

In the second data transmitting / receiving device,
Since the carrier signal for synchronizing the data transmission is a sine wave signal, it is possible to reduce the filter constant for smoothing the power supply voltage signal on which this carrier signal is superimposed in the subsequent stage, and to reduce the size of the parts used. At the same time, it is possible to reduce noise mixing with respect to the power supply voltage.

In the data read / write device, since the power supply voltage signal on which the carrier clock signal is superimposed is connected and supplied from the power supply voltage output terminal to the data storage device, an output terminal dedicated to the carrier clock or a transmission coil is required. In addition to miniaturization, efficient power supply is possible, and since data signals are transmitted and received wirelessly, such as by an electromagnetic induction method, reliable data transmission / reception processing can be performed without contact failure. Become.

In the data storage device, since the power supply voltage signal on which the carrier clock signal is superimposed is connected and supplied from the data reading / writing device to the data storage device through the power supply voltage input terminal, an input dedicated to the carrier clock is used. Since it can be downsized without requiring a terminal or a receiving coil, and can receive electric power with high efficiency, and data signals are transmitted and received wirelessly by, for example, an electromagnetic induction method,
It is possible to perform highly reliable data transmission / reception processing without contact failure.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configurations of a data read / write device 300 and a data storage device 400 using the data transmitting / receiving device of the present invention.

The carrier clock signal m for data transmission synchronization output from the control unit 30 of the data reading / writing device 300 is output from the power supply circuit 33 to the data storage device 4.
The power supply voltage n for 00 is superimposed in the power supply voltage / carrier clock superimposing circuit 34, and the metal power supply output terminals 44a and 44 are used as the power supply voltage / carrier clock superimposing signal o.
It is output from b.

In this case, the carrier clock signal m is superposed with its amplitude reduced so that the power supply voltage n becomes the center of the amplitude. The data storage device 40 is connected to the power output terminals 44a and 44b of the data reading / writing device 300.
When data is read / written to / from 0, power input terminals 45a, 4 provided in the data storage device 400
5b is connected.

On the other hand, a memory access signal k output from the control unit 30 as a serial signal such as command, address, data, etc. in synchronization with the carrier clock signal m.
Is modulated in the signal transmitter 31 and transmitted to the transmitter coil 40.
From the data storage device 4 as a transmission signal x by electromagnetic induction from
00 side is transmitted.

In the receiving coil 41, the data signal received by electromagnetic induction from the data storage device 400 is demodulated as the memory output signal w via the signal receiving section 32 and read by the control section 30.

From the data reading / writing device 300, power output terminals 44a, 44b and power input terminal 45a,
The power supply voltage / carrier clock superimposed signal p input to the data storage device 400 via 45b is separated into only the signal q of its frequency component via the coupling capacitor Cu and is supplied to the bias and waveform shaping circuit 37.

Further, the power supply voltage / carrier clock superposition signal p input through the power supply input terminals 45a and 45b.
Are also supplied in parallel to the smoothing circuit 39. FIG. 2 is a circuit diagram showing an internal configuration of the bias and waveform shaping circuit 37 and the smoothing circuit 39 in the data storage device 400 using the data transmitting / receiving device.

The bias and waveform shaping circuit 37 has a C
It is composed of a combination circuit of MOS inverters INV1 and INV2 and a feedback resistor R0, and the power supply voltage / carrier clock superimposed signal p is a coupling capacitor C.
When only the frequency component signal q is separated and supplied via u, the input of the inverter INV1 is biased to a value obtained by smoothing its output, and the carrier clock signal t having a duty ratio of 50% is taken out.

The smoothing circuit 39 includes a low pass filter L.L. P. F. It is composed of a balanced circuit by L. P. F. Thus, the clock signal q superimposed on the power supply voltage / carrier clock superimposition signal p is removed and taken out as the power supply voltage Vcc.

On the other hand, the reception signal y received by the electromagnetic induction of the reading / writing device 300 with respect to the reception coil 42 of the data storage device 400 is demodulated as a memory access signal r via the signal receiving part 35, and the memory part is obtained. 38
Is input to

The memory output signal s read from the memory section 38 is modulated by the signal transmitting section 36,
The data is read from the transmission coil 43 by electromagnetic induction.
It is transmitted to the writing device 300 side.

FIG. 3 is a timing chart showing transmission / reception operations in the data read / write device 300 and the data storage device 400 using the data transmission / reception device. Here, the case of transmitting and receiving the memory access signal k will be described.

In the data reading / writing device 300, the transmission source signal k of the memory access signal synchronized with the carrier clock signal m is sent from the control unit 30 to, for example, "0101".
When it is output after being changed to "001110", the signal transmitting unit 4
At 0, the transmission coil 40 is driven by being converted into the transmission signal x in which a pulse of a half clock is output only when the transmission source signal k is "1".

Then, the data reading / writing device 3
When the transmission / reception coils 40 and 41 in 00 and the transmission / reception coils 43 and 42 in the data storage device 400 are each configured as a small-scale device in which a spiral pattern is formed on a printed circuit board for device miniaturization, data storage In the receiving coil 42 of the device 400, a received signal y obtained by differentiating the rising edge of the transmitted signal x is generated by electromagnetic induction.

Then, the signal receiving section 35 creates a signal which is inverted at the rising edge of the received signal y, and
A signal obtained by further delaying this by one clock is created, and these two signals are output via the exclusive OR circuit (EXOR) in synchronization with the rising edge of the carrier clock signal t, so that the demodulated memo is generated. Access signal r "010
1001110 ″ is obtained and input to the memory unit 38.

Therefore, according to the data read / write device 300 and the data storage device 400 using the data transmitting / receiving device having the above-mentioned configuration, the data read / write device 300
The power supply voltage / carrier clock superimposing circuit 34 connects the power supply voltage signals o and p on which the carrier clock signal m for data transmission synchronization is connected to the power supply output terminals 44a and 44b and the power supply input terminals 45a and 45b. It is supplied to 400 and is obtained as the carrier clock signal t through the bias and waveform shaping circuit 37, and the operating power supply Vcc is obtained through the smoothing circuit 39, so that the power supply voltage n can be efficiently transmitted, and further, it is dedicated to the carrier clock. It is possible to realize downsizing and cost reduction without requiring a transmission / reception terminal or a coil, and to access the memory access signals k and r and the memory output signals s and w.
Are transmitted and received by electromagnetic induction from the corresponding signal transmitting units 31 and 36 through the transmitting and receiving coils 40, 42, 43 and 41, and are demodulated by the signal receiving units 35 and 32, so there is no fear of malfunction due to contact failure or the like. It can realize highly reliable data transmission.

In the above embodiment, the electromagnetic induction method using the transmission / reception coil has been described as the non-contact (wireless) data transmission method that does not use the transmission / reception terminal, but it is an optical communication method using the light transmitting / receiving element. May be.

Further, in the above-mentioned embodiment, the carrier clock signals m and t for synchronizing data transmission are configured such that one clock data corresponds to a rectangular wave of one clock. If it is configured as a wave, for example, the filter constant in the smoothing circuit 39 can be reduced to achieve further miniaturization, and the occurrence of ripples in the power supply voltage Vcc obtained by the smoothing is reduced to suppress power supply noise. You can Further, if the clock frequencies of the carrier clock signals m and t are made integral multiples, the data transmission efficiency can be improved.

[0043]

As described above, according to the first data transmitter / receiver of the present invention, the power supply voltage signal on which the carrier clock signal is superimposed is connected to the power supply voltage output terminal from the data reading / writing device. Since it is supplied to the data storage device via the power supply voltage input terminal, it can be downsized without the need for an input / output terminal dedicated to the carrier clock or a transmission / reception coil, and moreover, efficient power supply can be performed.
Since the data signal is transmitted / received wirelessly by, for example, an electromagnetic induction method, reliable data transmission / reception processing can be performed without contact failure.

Further, according to the second data transmitting / receiving apparatus of the present invention, since the carrier signal for synchronizing the data transmission is a sine wave signal, the power supply voltage signal on which the carrier signal is superimposed is smoothed in the subsequent stage. It is possible to reduce the filter constant to reduce the number of components used, reduce the size of the components used, and reduce the noise contamination with respect to the power supply voltage.

Further, according to the data read / write device of the present invention, since the power supply voltage signal on which the carrier clock signal is superimposed is connected and supplied from the power supply voltage output terminal to the data storage device, an output terminal dedicated to the carrier clock or The transmitter coil is not required, the size can be reduced, the power can be supplied efficiently, and the data signal is transmitted / received wirelessly such as an electromagnetic induction method, so that reliable data transmission / reception processing can be performed without contact failure. You will be able to do it.

According to the data storage device of the present invention,
Since the power supply voltage signal on which the carrier clock signal is superimposed is connected and supplied from the data reading / writing device to the data storage device via the power supply voltage input terminal, there is no need for an input terminal dedicated to the carrier clock or a receiving coil, and downsizing is achieved. In addition to being able to receive electric power efficiently, data signals are transmitted and received wirelessly, for example, by an electromagnetic induction method, so that reliable data transmission / reception processing can be performed without contact failure. Therefore, according to the data transmission / reception device of the present invention, it is possible to perform highly reliable data transmission, and it is possible to obtain a favorable power transmission efficiency that is advantageous for downsizing.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a data read / write device and a data storage device using a data transmission / reception device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing an internal configuration of a bias and waveform shaping circuit and a smoothing circuit in a data storage device using the data transmitting / receiving device.

FIG. 3 is a diagram for reading data using the data transmitting / receiving device.
6 is a timing chart showing a transmission / reception operation in a writing device and a data storage device.

FIG. 4 is a block diagram showing configurations of a conventional read / write device (reader / writer) and a data storage device for transmitting and receiving data by a contact method.

FIG. 5 is a block diagram showing configurations of a conventional read / write device (reader / writer) and a data storage device for transmitting and receiving data in a non-contact manner.

[Explanation of symbols]

30 ... Control unit, 31 ... Memory access signal transmission unit (modulation circuit), 32 ... Memory output signal reception unit (demodulation circuit), 3
3 ... Power supply circuit, 34 ... Power supply voltage / carrier clock superimposing circuit, 35 ... Memory access signal receiving section (demodulation circuit), 3
6 ... Memory output signal signal transmission unit (modulation circuit), 37 ... Bias and waveform shaping circuit, 38 ... Memory unit, 39 ... Smoothing circuit, 40 ... Memory access signal transmission coil, 41 ... Memory output signal reception coil, 42 ... Memory Access signal receiving coil, 43 ... Memory output signal transmitting coil, 44a,
44b ... Power supply signal output terminal, 45a, 45b ... Power supply signal input terminal, Cu ... Coupling capacitor, n, Vcc
... power supply voltage, m, t ... carrier clock signal, o, p ... power supply voltage / carrier clock superimposed signal, q ... frequency component clock signal, k, r ... memory access signal, w, s ... memory output signal, 300 ... data Read / write device, 400 ...
Data storage device.

Claims (4)

[Claims] 1. A data transmitting / receiving device for transmitting data between a data reading / writing device and a data storage device, wherein the data reading / writing device superimposes a carrier signal for data transmission synchronization on a power supply voltage. A power supply output terminal for outputting a power supply voltage signal on which the carrier signal is superimposed by the superimposing means, and a first transmitting / receiving means for transmitting and receiving a data signal wirelessly in synchronization with the carrier signal superimposed by the superimposing means. The data storage device includes a power supply input terminal detachably connected to the power supply output terminal, and a carrier driven by a power supply voltage input from the power supply input terminal and superimposed on the power supply voltage signal. Data transmission / reception, comprising: a second transmission / reception means for transmitting / receiving a data signal wirelessly to / from the first transmission / reception means in synchronization with the signal. Apparatus. 2. The data transmitting / receiving apparatus according to claim 1, wherein the carrier signal is a sine wave signal. 3. A data read / write device for reading and writing data to and from a separately prepared data storage device, and a superimposing means for superimposing a carrier signal for data transmission synchronization on a power supply voltage. A power supply output terminal for outputting a power supply voltage signal on which the carrier signal is superposed by the means, and a transmitting / receiving means for wirelessly transmitting and receiving a data signal in synchronization with the carrier signal superposed by the superposing means. And a data reading / writing device. 4. A data storage device in which data is read and written by a separately provided data reading / writing device, wherein a power input terminal is detachably connected to a power output terminal of the data reading / writing device. And a transmitting / receiving means for wirelessly transmitting / receiving a data signal to / from the data reading / writing device in synchronization with a carrier signal which is driven by a power supply voltage input from the power supply input terminal and is superimposed on the power supply voltage signal. A data storage device comprising: