JP2022080140A - Fingerprint authentication card - Google Patents

Abstract

To provide a fingerprint authentication card capable of optimizing power consumption efficiency, increasing a communication distance, and improving a fingerprint authentication function, while being operable without requiring a separate power source by generating an induction current, decreasing an input voltage, and outputting a power source.SOLUTION: The present disclosure is related to a fingerprint authentication card capable of recognizing a fingerprint of a user and executing authentication and security functions. The fingerprint authentication card includes: a fingerprint authentication unit which is configured to detect a fingerprint of a user; a control unit which is configured to execute registration and authentication of the detected fingerprint of the user; a communication unit which is configured to be tagged with an external reader by the registration and authentication of the control unit; and an induction current generation unit which is configured to generate an induction current by approaching to the external reader. The induction current generation unit is configured to generate the induction current, convert the generated induction current to a direct current, decrease an input voltage of the converted direct current, and supply the decreased output voltage to the fingerprint authentication unit, the control unit, and the communication unit if the distance from the external reader is a prescribed distance or shorter.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fingerprint authentication card, and more particularly to a fingerprint authentication card capable of recognizing a user's fingerprint and performing authentication and security functions.

In general, smart cards can be broadly classified into contact smart cards and contactless smart cards.

Contact smart cards are cards in which power and signals are transmitted from terminals via physical contacts and can be used for banking and credit cards.

A contactless smart card is a card that transfers data using a Radio Frequency (RF) wireless signal system, and can be used for transportation cards such as buses and subways.

By applying such smart cards to identity verification systems, card readers will be installed mainly at the entrances and exits of laboratories and other confidential places, and only those who have the prescribed smart cards will be allowed to enter and exit. do.

However, such an identity verification system using a smart card has a problem that when a smart card is lost, a person who finds the lost smart card can use it to invade without permission.

Therefore, in order to strengthen security authentication, a fingerprint authentication card capable of performing biometric authentication such as fingerprint authentication has been developed.

That is, as a conventional fingerprint authentication card, the authentication processing algorithm of a fusion card that operates NFC module short-range wireless communication in conjunction with fingerprint authentication is registered in Korea Registered Patent No. 10-1792002 (October 25, 2017). Has been done.

However, since the conventional fingerprint authentication card requires a separate power supply or charging of the power supply, there is a problem that the weight and size of the card increase, the manufacturing cost is high, and the operating distance with the NFC reader is short. There was a problem that the fingerprint authentication operation was not smooth when the distance from the reader was long.

Therefore, from now on, it will be possible to operate without a separate power supply, it will be possible to manufacture at low cost, light weight and miniaturization, and the power consumption efficiency will be optimized, the communication distance will be increased, and the fingerprint authentication function will be improved. The development of a fingerprint authentication card that can be used is required.

The technical problem to be solved by one embodiment of the present invention is that it can operate without a separate power supply by generating an induced current, reducing the input voltage, and outputting a power supply, and power consumption efficiency. Provides a fingerprint authentication card that can optimize the power consumption, increase the communication distance, and improve the fingerprint authentication function.

The technical problem to be solved by the present invention is not limited to the above-mentioned technical problem, and another technical problem not mentioned is usually described in the following description in the technical field to which the present invention belongs. It should be clearly understood by those who have the knowledge of.

In order to solve the above technical problems, the fingerprint authentication card according to the embodiment of the present invention has a fingerprint authentication unit configured to detect the user's fingerprint and the registered authentication of the detected user fingerprint. An induced current configured to generate an induced current by approaching the control unit configured to do so, the communication unit configured to be tagged as an external reader by registration authentication of the control unit, and the external reader. Including the generator.

If the distance to the external reader is within a predetermined distance, the induced current generator generates an induced current, converts the generated induced current into direct current, reduces the input voltage of the converted direct current, and reduces the voltage. The output voltage can be configured to be supplied to the fingerprint authentication unit, the control unit, and the communication unit. Here, the induced current generation unit has a coil antenna unit that generates an induced current, a rectifying unit that is configured to convert the generated induced current from alternating current to direct current, and reduces the input voltage of the converted direct current. , A decompression circuit unit configured to output a depressurized voltage can be included.

The coil antenna portion can be arranged such that the coil is wound along the outermost edge of the card surface.

The pressure reducing circuit unit can be configured to reduce the input voltage and output the reduced voltage based on the maximum current consumption values of the fingerprint authentication unit and the control unit.

The decompression circuit unit is configured to convert an input signal input to the first input terminal into a pulse signal and output it, and maintain the amplitude of the output signal based on the feedback signal input to the second input terminal. A first signal conversion unit and a pulse signal converted by the first signal conversion unit are input, converted into a smoothing signal and output, and the output signal is fed back to the first signal conversion unit. It can include two signal converters.

The decompression circuit unit may further include a constant voltage unit configured to maintain an input signal input to the first input terminal of the first signal conversion unit at a constant voltage.

The decompression circuit unit may further include a ripple removing unit which is connected to the output terminal of the second signal conversion unit and is configured to remove the ripple of the output signal output from the second signal conversion unit.

The communication unit can include a short-range wireless communication module.

When the fingerprint is detected by the fingerprint authentication unit, the control unit confirms whether the detected fingerprint is a registered fingerprint, and if the detected fingerprint is a registered fingerprint, it is tagged as an external reader. Can be configured to control the communication unit.

The control unit can be configured to control the communication unit so that it is not tagged with an external reader unless the detected fingerprint is a registered fingerprint.

When the fingerprint is detected by the fingerprint authentication unit, the control unit can be configured to execute at least one of registration, matching, and deletion processing on the detected fingerprint.

The effect of the fingerprint authentication card according to the present invention will be described below.

The present invention generates an induced current, reduces the input voltage, and outputs a power source so that it can be operated without a separate power source. It is possible to provide the effect of optimizing the consumption efficiency, increasing the communication distance, and improving the fingerprint authentication function.

The applicable additional scope of the present invention will be further clarified in the following detailed description. However, since various changes and modifications within the ideas and scope of the present invention can be clearly understood by those skilled in the art, detailed explanations and specific examples such as a preferred embodiment of the present invention are provided. It should be understood as simply given as an example.

FIG. 1 is a block configuration diagram for explaining the fingerprint authentication card according to the present invention. FIG. 2 is a circuit diagram for explaining a decompression circuit unit of the induced current generation unit of FIG. FIG. 3 is a signal waveform diagram measured at a specific node of the decompression circuit section of FIG.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

The suffixes "module" and "part" to the components used in the following description are simply given in consideration of the ease of preparation of the present specification, and the above-mentioned "module" and "part" are given. , Can be mixed with each other. As an example, "modules" and "parts" can be configured to embody functionality by one or more processors.

Further, the embodiments of the present invention will be described in detail below with reference to the attached drawings and the contents described in the attached drawings, but the present invention is not limited or limited by the embodiments. do not have.

As the terms used herein, we have selected common terms that are now widely used as much as possible, taking into account the functionality of the present invention, but this is the intent of engineers engaged in the art. It may change due to customs or the emergence of new technologies. In addition, there are some terms arbitrarily selected by the applicant in specific cases, and the meanings are described in the explanation of the invention corresponding to this case. Therefore, the terms used herein should be construed on the basis of the substantive meaning of the terms and the general content of the specification, rather than the names of the terms. I want to clarify.

FIG. 1 is a block configuration diagram for explaining the fingerprint authentication card according to the present invention.

As shown in FIG. 1, the fingerprint authentication card 10 according to the present invention has a fingerprint authentication unit 100 that detects a user's fingerprint, a control unit 200 that performs fingerprint registration authentication of the detected user, and registration authentication of the control unit 200. It can include a communication unit 300 tagged with an external reader and an induced current generation unit 400 that generates an induced current by approaching the external reader.

Here, the induced current generation unit 400 generates an induced current if the distance from the external reader is within a predetermined distance, converts the generated induced current into direct current, and reduces the input voltage of the converted direct current. The output voltage generated by reducing the input voltage can be supplied to the fingerprint authentication unit 100, the control unit 200, and the communication unit 300.

As an example, the induced current generation unit 400 includes a coil antenna unit 410 that generates an induced current by approaching an external reader, a rectifying unit 420 that converts the generated induced current from alternating current to direct current, and a converted direct current input. It can include a decompression circuit unit 430 that depressurizes the voltage and outputs the decompressed voltage.

Here, the coil antenna portion 410 can be arranged so that the coil is wound along the outermost shell edge of the card surface. The reason is that the larger the size of the coil antenna portion 410, the more advantageous for energy harvesting, and therefore it is advantageous for the coil to be wound along the outermost outer edge of the card surface.

The coil antenna portion 410 can have about 1 to about 5 coil turns, but is not limited to this. The reason is that the smaller the number of coil turns of the coil antenna portion 410 is, the more advantageous it is for energy harvesting, and therefore it is advantageous to set the number of coil turns to about 1 to about 5.

After that, the pressure reducing circuit unit 430 can reduce the input voltage and output the reduced voltage based on the maximum current consumption values of the fingerprint authentication unit 100 and the control unit 200.

As an example, the decompression circuit unit 430 inputs so that the maximum current consumption value of the fingerprint authentication unit 100 and the control unit 200 is the same as, or a larger current value is supplied to the fingerprint authentication unit 100 and the control unit 200. The voltage can be reduced.

The reason is that when the reduced voltage is supplied to the fingerprint authentication unit 100 and the control unit 200 via the pressure reducing circuit unit 430, a current capable of satisfying the maximum current consumption of the fingerprint authentication unit 100 and the control unit 200 is supplied. This is because the communication distance can be extended and the fingerprint authentication function can be improved only after this.

Therefore, the induced current generation unit 400 of the present invention generates an induced current even when the distance from the external reader is about 40 mm to about 60 mm, and sufficient power can be supplied by energy harvesting, so that the communication distance is extended and the fingerprint is fingerprinted. The authentication function can be improved.

For example, the induced current generation unit 400 can generate an induced current within a distance of about 60 mm from an external reader.

The decompression circuit unit 430 can be variously designed to increase the maximum power consumption efficiency of the fingerprint authentication unit 100 and the control unit 200.

As an example, the decompression circuit unit 430 converts the input signal input to the first input terminal into a pulse signal and outputs it, and outputs the converted pulse signal based on the feedback signal input to the second input terminal. Receives input from the first signal conversion unit (reference numeral 4320 in the drawing of FIG. 2) that maintains the signal amplitude and the pulse signal converted from the first signal conversion unit, converts it into a smoothed signal, outputs it, and converts it into a smoothed signal. A second signal conversion unit (reference numeral 4330 in FIG. 2) that feeds back the output signal to the second input terminal of the first signal conversion unit can be included.

Here, when the input signal is input to the first input terminal, the first signal conversion unit (reference numeral 4320 in the drawing of FIG. 2) converts the input signal into a pulse signal and outputs the converted pulse signal to the output terminal. A signal conversion unit and a comparison unit that compares the feedback signal with the input signal and maintains the amplitude of the output signal output to the output terminal when the feedback signal is input to the second input terminal can be included.

Further, one side of the second signal conversion unit (reference numeral 4330 in FIG. 2) is connected to the output terminal of the first signal conversion unit (reference numeral 4320 in FIG. 2), and the other side is the second input of the first signal conversion unit. It can include an inductor connected to a terminal and a capacitor one side connected to the other side of the inductor and grounded on the other side.

Further, the decompression circuit unit 430 has a constant voltage unit (reference numeral 4310 in FIG. 2) that maintains an input signal input to the first input terminal of the first signal conversion unit (reference numeral 4320 in FIG. 2) at a constant voltage. Further can be included.

Here, one side of the constant voltage unit is connected to the first input terminal of the first signal conversion unit, and the other side is grounded, and between the first input terminal of the first signal conversion unit and one side of the Zener diode. Can include an input capacitor that is connected to one side of the node and grounded on the other side.

At this time, in the constant voltage section, the Zener diode and the input capacitor can be connected in parallel with each other.

Further, the pressure reducing circuit unit 430 further includes a ripple removing unit (reference numeral 4340 in FIG. 2) which is connected to the output terminal of the second signal conversion unit and removes ripple of the output signal output from the second signal conversion unit. be able to.

As an example, the ripple removing section can include, but is not limited to, ferrite beads.

Next, the communication unit 300 can include a short-range wireless communication module. As an example, the near field communication module may include, but is not limited to, an NFC chip.

Next, when the fingerprint is detected from the fingerprint authentication unit 100, the control unit 200 confirms whether or not the detected fingerprint is a registered fingerprint, and if the detected fingerprint is a registered fingerprint, the control unit 200 is referred to an external reader. The communication unit 300 can be controlled to be tagged.

In some cases, the control unit 200 can control the communication unit 300 so that the detected fingerprint is not tagged as an external reader unless it is a registered fingerprint.

Further, the control unit 200 can execute at least one of registration, matching, and deletion of the fingerprint detected by the fingerprint authentication unit 100.

On the other hand, the external reader can be, but is not limited to, an NFC reader that generates an electromagnetic field.

In the fingerprint authentication card 10 of the present invention configured as described above, when the fingerprint authentication card 10 of the present invention is close to an external reader, the induced current generation unit 400 generates an induced current, converts the generated induced current into direct current, and the converted direct current input voltage. The reduced voltage (output voltage) can be supplied to the fingerprint authentication unit 100, the control unit 200, and the communication unit 300.

Subsequently, the fingerprint authentication card 10 of the present invention can be operated by optimizing the power consumption efficiency of the fingerprint authentication unit 100 and the control unit 200.

Here, when the fingerprint is detected by the fingerprint authentication unit 100, the control unit 200 of the fingerprint authentication card 10 confirms whether or not the detected fingerprint is a registered fingerprint, and the detected fingerprint is a registered fingerprint. For example, the communication unit 300 can be controlled so as to be tagged with an external reader.

Next, when the external reader is tagged with the communication unit 300 of the fingerprint authentication card 10, the external reader can execute the corresponding function by user authentication.

For example, when applied to a door security authentication device, the door can be opened and closed according to the door authentication.

As described above, the present invention makes it possible to operate without a separate power supply by generating an induced current, reducing the input voltage, and outputting a power supply, and it is possible to manufacture low cost, light weight, and miniaturization. Moreover, it is possible to provide the effect of optimizing the power consumption efficiency, extending the communication distance, and improving the fingerprint authentication function.

FIG. 2 is a circuit diagram for explaining the decompression circuit unit of the induced current generation unit of FIG. 1, and FIG. 3 is a signal waveform diagram measured at a specific node of the decompression circuit unit of FIG.

As shown in FIG. 2, the decompression circuit unit of the induced current generation unit can include a constant voltage unit 4310, a first signal conversion unit 4320, a second signal conversion unit 4330, and a ripple removal unit 4340.

Here, the constant voltage unit 4310 can maintain the input signal input to the first input terminal VIN of the first signal conversion unit 4320 at a constant voltage.

As an example, the constant voltage unit 4310 has a Zener diode 4312 whose one side is connected to the first input terminal VIN of the first signal conversion unit 4320 and whose other side is grounded, and the first input terminal VIN of the first signal conversion unit 4320. It can include an input capacitor 4314 where one side is connected to a node between one side of the Zener diode 4312 and the other side is grounded.

At this time, in the constant voltage unit 4310, the Zener diode 4312 and the input capacitor 4314 can be connected in parallel to each other.

Further, the first signal conversion unit 4320 converts the input signal input to the first input terminal VIN of the first signal conversion unit 4320 into a pulse signal and outputs it, and outputs it from the second signal conversion unit 4330. Based on the feedback signal input to the second input terminal VOS of the signal conversion unit 4320, the amplitude of the output signal converted into a pulse signal by the first signal conversion unit 4320 and output can be maintained.

As an example, the first signal conversion unit 4320 includes a pulse signal conversion unit that converts an input signal into a pulse signal and outputs the converted pulse signal to the output SW when the input signal is input to the first input terminal VIN. When the feedback signal output from the second signal conversion unit 4330 is input to the second input terminal VOS, the feedback signal is compared with the input signal, and the first signal is output to the output terminal SW of the first signal conversion unit 4320. It can include a comparison section that maintains the amplitude of the output signal.

Subsequently, the second signal conversion unit 4330 receives the input of the pulse signal converted from the first signal conversion unit 4320, converts it into a smoothing signal and outputs it, and converts it into a smoothing signal and outputs the second output signal. (Feedback signal) can be fed back to the first signal conversion unit 4320.

As an example, the second signal conversion unit 4330 has an inductor 4332 and an inductor whose one side is connected to the output terminal SW of the first signal conversion unit 4320 and the other side is connected to the second input terminal VOS of the first signal conversion unit 4320. It can include a capacitor 4334 in which one side is connected to the other side of the 4332 and the other side is grounded.

Next, the ripple removing unit 4340 is connected to the output terminal of the second signal conversion unit 4330, and can remove the ripple of the second output signal output from the second signal conversion unit 4330.

As an example, the ripple removing section 4340 may include, but is not limited to, ferrite beads.

As shown in FIG. 3, the decompression circuit unit of the induced current generation unit can convert the input signal into the pulse signal A by the first signal conversion unit 4320.

Further, the decompression circuit unit can convert the pulse signal A into a smoothing signal C having a low amplitude by the second signal conversion unit 4330.

In this way, the pressure reducing circuit unit can reduce the input voltage and output the reduced voltage based on the maximum current consumption values of the fingerprint authentication unit and the control unit.

As an example, the decompression circuit unit may reduce the input voltage so that a current value equal to or larger than the maximum current consumption value of the fingerprint authentication unit and the control unit is supplied to the fingerprint authentication unit and the control unit. can.

The reason is that when the decompressed voltage is supplied to the fingerprint authentication unit and the control unit via the decompression circuit unit, the communication distance is extended by increasing the maximum current consumption efficiency of the fingerprint authentication unit and the control unit, and the fingerprint is fingerprinted. This is because the authentication function can be improved.

As described above, the features, structures, effects and the like described in the present invention are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Further, the features, structures, effects, etc. exemplified in each embodiment can be combined or modified with respect to other embodiments by a person having ordinary knowledge in the field to which the embodiment belongs. be. Therefore, the contents relating to these combinations and modifications should be construed as being included in the scope of the present invention.

In addition, although the examples have been mainly described above, this is merely a simple example and does not limit the present invention, and any person who has ordinary knowledge in the field to which the present invention belongs can use the present examples. It can be seen that a number of different variants and applications not exemplified above are possible, as long as they do not deviate from the essential properties of. For example, each component specifically shown in the examples can be modified and implemented. In addition, such variations and differences related to application should be construed as being included in the scope of the invention as defined in the appended claims.

10: Fingerprint authentication card 100: Fingerprint authentication unit 200: Control unit 300: Communication unit 400: Inductive current generation unit

Claims (12)

A fingerprint authentication unit configured to detect the user's fingerprint,
A control unit configured to perform fingerprint registration authentication of the detected user,
A communication unit configured to be tagged as an external reader by the registration authentication of the control unit,
Including an induced current generator configured to generate an induced current upon approach to the external reader.
The induced current generator is
If the distance to the external reader is within a predetermined distance, the induced current is generated.
The generated induced current is converted to direct current and
The input voltage converted to direct current is reduced to generate an output voltage, and the output voltage generated by reducing the input voltage is supplied to the fingerprint authentication unit, the control unit, and the communication unit. Fingerprint authentication card. The induced current generator is
A coil antenna unit configured to generate the induced current by access to the external reader, and
A rectifying unit configured to convert the generated induced current from alternating current to direct current,
The fingerprint authentication card according to claim 1, further comprising a pressure reducing circuit unit configured to reduce the input voltage of the converted direct current and output the reduced voltage. The coil antenna portion is
The fingerprint authentication card according to claim 2, comprising a coil arranged to be wound along the outermost edge of the card surface. The decompression circuit unit includes a first signal conversion unit and a second signal conversion unit.
The first signal conversion unit is
The input signal input to the first input terminal of the first signal conversion unit is converted into a pulse signal and output, and then output from the second signal conversion unit to the second input terminal of the first signal conversion unit. It is configured to maintain the amplitude of the first output signal converted into the pulse signal based on the input feedback signal.
The second signal conversion unit is
The feedback signal, which is a second output signal that receives the input of the converted pulse signal from the first signal conversion unit, converts it into a smoothing signal and outputs it, and converts it into the smoothing signal and outputs it, is the first. 1 The fingerprint authentication card according to claim 2, which is configured to feed back to the second input terminal of the signal conversion unit. The first signal conversion unit is
A pulse signal conversion unit configured to convert the input signal input to the first input terminal into the pulse signal and output the converted pulse signal to an output, and the second input terminal. 4. The fingerprint authentication according to claim 4, further comprising a comparison unit configured to compare the input signal with the feedback signal input to and maintain the amplitude of the first output signal output to the output terminal. card. The second signal conversion unit is
An inductor in which one side is connected to the output terminal of the first signal conversion unit and the other side is connected to the second input terminal of the first signal conversion unit.
The fingerprint authentication card according to claim 5, comprising a capacitor in which one side is connected to the other end of the inductor and the other side is grounded. The decompression circuit unit
The input voltage is reduced and the output is reduced so that a current value equal to or larger than the maximum current consumption value of the fingerprint authentication unit and the control unit is supplied to the fingerprint authentication unit and the control unit. The fingerprint authentication card according to claim 6, wherein a voltage is supplied to the fingerprint authentication unit and the control unit. The decompression circuit unit
The fingerprint authentication card according to claim 7, further comprising a constant voltage unit configured to maintain the input signal input to the first input terminal of the first signal conversion unit at a constant voltage. The constant voltage section is
A Zener diode whose one side is connected to the first input terminal of the first signal conversion unit and whose other side is grounded.
It includes an input capacitor in which one side is connected to a node between the first input terminal of the first signal conversion unit and one side of the Zener diode and the other side is grounded.
The fingerprint authentication card according to claim 8, wherein the Zener diode and the input capacitor are connected to each other in parallel between the first input terminal and the ground. The decompression circuit unit
7. The seventh aspect of the present invention further comprises a ripple removing unit connected to an output terminal of the second signal conversion unit and configured to remove the ripple of the second output signal output from the second signal conversion unit. Fingerprint authentication card. The fingerprint authentication card according to claim 10, wherein the ripple removing unit includes ferrite beads. The control unit
When the fingerprint is detected from the fingerprint authentication unit, it is confirmed whether the detected fingerprint is a registered fingerprint, and if the detected fingerprint is the registered fingerprint, it is tagged with the external reader. The fingerprint authentication card according to claim 1, which is configured to control the communication unit.

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