CN108038924B - Method and system for preventing composite pass card from being awoken by mistake - Google Patents
Method and system for preventing composite pass card from being awoken by mistake Download PDFInfo
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- CN108038924B CN108038924B CN201711297228.1A CN201711297228A CN108038924B CN 108038924 B CN108038924 B CN 108038924B CN 201711297228 A CN201711297228 A CN 201711297228A CN 108038924 B CN108038924 B CN 108038924B
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- control unit
- safety control
- embedded safety
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- induction coil
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
- G07B15/00—Arrangements or apparatus for collecting fares, tolls or entrance fees at one or more control points
- G07B15/06—Arrangements for road pricing or congestion charging of vehicles or vehicle users, e.g. automatic toll systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0722—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips comprising an arrangement for testing the record carrier
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
Abstract
The invention discloses a method for preventing a composite pass card from being awoken by mistake, which comprises the following steps: the composite pass card obtains energy through the non-contact induction coil; triggering the embedded safety control unit to enter a working state by using the acquired energy; when the embedded safety control unit enters a working state, the embedded safety control unit outputs a high level to the central processing unit through the awakening pin; receiving data through the embedded safety control unit, and detecting the received data through the embedded safety control unit; when the received data is detected to be normal communication data, the embedded safety control unit outputs a low level to the central processing unit through the awakening pin; when the non-contact induction coil stops acquiring energy, the level output by the awakening pin of the embedded safety control unit is increased from a low level to a high level; when the low level output by the awakening pin of the embedded safety control unit rises, the central processing unit enters a working state.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and a system for preventing a composite pass card from being mistakenly awakened.
Background
The ambiguous path recognition system is a subsystem of a highway networked toll collection system. When the vehicle passes through the roadside identification station at high speed, the composite pass card receives and stores the path identification information in the card, and when the vehicle passes through the MTC exit, the entry information and the path information in the card are read out through the card reader to determine the running path of the vehicle and the amount of the pass fee.
The compound traffic card CPC card integrates the communication functions of 5.8GHz and 13.56MHz, supports the reading and writing functions of entrance information and path information, and provides reusable traffic media for vehicles and retrieved from an exit lane in an entrance lane of a closed toll road toll station. The CPC card is battery powered but is mistakenly woken if often disturbed by a 13.56MHz field, resulting in unnecessary power loss and affecting the service life of the product.
Composite access card (CPC card): the system integrates the communication functions of 5.8GHz and 13.56MHz, supports the reading and writing functions of entrance information and path information, and provides reusable traffic media for vehicles and for retrieving from an exit lane in an entrance lane of a closed toll road toll station. The highway networking charging system can also involve:
MTC, Manual semi-automatic charging Manual Toll Collection.
MCU, central processing unit.
The dual-interface ESAM is an embedded safety storage unit with a 13.56MHz non-contact function and a 7816 contact function.
With the continuous development of information transmission technology, wake-up sources with different frequency bands and different signal strengths may exist in the practical application environment of the composite access card CPC, and the wake-up sources continuously transmit signals; however, these signals are not normal wake-up signals transmitted by the card reader or not normal wake-up signals transmitted by the card reader, and belong to wrong composite pass card CPC wake-up signals (also called false wake-up signals), and the composite pass card CPC will perform frequent false wake-up under the action of these false wake-up signals, which causes the power consumption of the composite pass card CPC to be rapidly consumed, so that the service life of the composite pass card CPC is greatly reduced.
At the entrance of the MTC, the card reader clears the path information through the 13.56MHz channel and writes the entrance information into the composite access card CPC. When the composite pass card CPC is at the MTC outlet, the card reader can verify the validity of the composite pass card CPC through a 13.56MHz channel and read the entrance information and the path information. In the prior art, the composite access card CPC only checks the field intensity of 13.56MHz of the card reader, and wakes up the MCU of the composite access card CPC to work when the field intensity reaches a preset value.
Therefore, a technique is needed for preventing the composite pass card from being mistakenly woken up.
Disclosure of Invention
The invention provides a method and a system for preventing a composite pass card from being awoken by mistake, which are used for solving the problem of how to prevent the composite pass from being awoken by mistake.
In order to solve the above problem, the present invention provides a method for preventing a composite pass card from being mistakenly awakened, wherein the method comprises:
the composite pass card obtains energy through the non-contact induction coil;
triggering the embedded safety control unit to enter a working state by using the acquired energy;
when the embedded safety control unit enters a working state, the embedded safety control unit outputs a high level to the central processing unit through the awakening pin; receiving data through the embedded safety control unit, and detecting the received data by the embedded safety control unit;
when the received data is detected to be normal communication data, the embedded safety control unit outputs a low level to the central processing unit through the awakening pin;
when the non-contact induction coil stops acquiring energy, the level output by the awakening pin of the embedded safety control unit is increased from a low level to a high level;
and when the low level output by the awakening pin of the embedded safety control unit rises, the central processing unit enters a working state.
Preferably, the obtaining of energy by the non-contact induction coil comprises:
the non-contact inductive coil draws power by proximity to the reader.
Preferably, when the non-contact induction coil stops obtaining energy, the low level output by the wakeup pin of the embedded safety control unit rises until the wakeup pin of the embedded safety control unit outputs a high level.
Preferably, the embedded security control unit enters a sleep state.
Preferably, the embedded security control unit comprises a 13.56MHz contactless channel interface and a 7816 interface.
Preferably, the 13.56MHz non-contact channel interface is connected to the non-contact induction coil, and when the embedded safety control unit is in an operating state, energy is obtained through the non-contact induction coil.
Preferably, when the received data is detected to be abnormal communication data, the embedded security control unit outputs a high level to the central processing unit through a wake-up pin.
According to another aspect of the present invention, there is provided a system for preventing a composite access card from being mistakenly woken up, the system comprising:
the composite pass card acquires energy through the non-contact induction coil;
the embedded safety control unit is triggered to enter a working state by utilizing the acquired energy; the embedded safety control unit enters a working state, outputs a high level to a central processing unit through a wake-up pin, receives data through the embedded safety control unit, and detects the received data; when the received data is detected to be normal communication data, the embedded safety control unit outputs a low level to the central processing unit through the awakening pin; the non-contact induction coil stops acquiring energy, and the level output by the awakening pin of the embedded safety control unit is increased from a low level to a high level; and the low level output by the awakening pin of the embedded safety control unit rises, and the central processing unit enters a working state.
Preferably, the non-contact induction coil is further configured to:
energy is captured by proximity to the reader.
Preferably, the non-contact induction coil stops obtaining energy, and the low level output by the wakeup pin of the embedded safety control unit rises until the wakeup pin of the embedded safety control unit outputs a high level.
Preferably, the embedded security control unit enters a sleep state.
Preferably, the embedded security control unit comprises a 13.56MHz contactless channel interface and a 7816 interface.
Preferably, the 13.56MHz non-contact channel interface is connected to the non-contact induction coil, and when the embedded safety control unit is in an operating state, energy is obtained through the non-contact induction coil.
Preferably, when the received data is detected to be abnormal communication data, the embedded security control unit outputs a high level to the central processing unit through the wake-up pin.
According to the method and the system for preventing the composite access card from being awakened by mistake, provided by the technical scheme of the invention, the composite access card CPC is prevented from being awakened if only the field intensity is detected, the composite access card CPC is very easy to be awakened frequently by the interfered field of 13.56MHz to cause the power consumption of a battery, and the composite access card CPC cannot work if the electric quantity of the battery is too low. According to the technical scheme, the field intensity of the environment where the composite access card CPC is located is detected, and whether the data received by the composite access card CPC is normal communication data is detected.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a flowchart of a method for preventing a composite password card from being mistakenly awakened according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a system for preventing a composite password card from being mistakenly awakened according to an embodiment of the present invention; and
fig. 3 is a schematic diagram illustrating a level change of a wake-up pin according to an embodiment of the invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flowchart of a method for preventing a composite pass card from being mistakenly woken up according to an embodiment of the invention. The method for preventing the composite access card from being awoken by mistake prevents the composite access card CPC from being awoken if only the field intensity is detected, and the composite access card CPC is very easy to be awoken frequently by the interfered field of 13.56MHz to cause the battery power consumption. The method for preventing the composite access card from being awoken by mistake enables the central processing unit MCU of the composite access card CPC to be awoken for working only by the normal communication frame, prevents the composite access card CPC from being awoken by mistake, prolongs the service life of the composite access card CPC product and improves the reliability of the product. As shown in fig. 1, a method 100 for preventing a composite pass card from being mistakenly woken up includes:
preferably, in step 101: the composite access card obtains energy through the non-contact induction coil.
Preferably, the energy is obtained by a non-contact induction coil comprising: the non-contact inductive coil draws power by proximity to the reader.
In the present application, the non-contact inductive coil is energized when the composite access card CPC is close to the reader, i.e. into the field strength range of 13.56 MHz.
Preferably, at step 102: and triggering the embedded safety control unit to enter a working state by using the acquired energy.
In the application, the working energy of the embedded safety control unit is obtained from the non-contact induction coil, and the electric quantity of the battery is not required to be consumed.
Preferably, the embedded security control unit comprises a 13.56MHz contactless channel interface and a 7816 interface.
Preferably, the 13.56MHz non-contact channel interface is connected to a non-contact induction coil, and when the embedded safety control unit is in an operating state, energy is obtained through the non-contact induction coil.
In the application, the 7816 interface is a communication interface between the central processing unit MCU and the embedded security control unit ESAM, and after the embedded security control unit ESAM wakes up the central processing unit MCU at an MTC inlet or outlet, the central processing unit MCU can read information written into the ESAM by the card reader through the 7816 interface, and the 5.8GHz function is turned on or off according to the information content.
Preferably, in step 103: when the embedded safety control unit enters a working state, the embedded safety control unit outputs a high level to the central processing unit through the awakening pin; and receiving the data through the embedded safety control unit, and detecting the received data by the embedded safety control unit.
In the application, after the embedded safety control unit obtains energy and enters a working state, the embedded safety control unit outputs a high level to the central processing unit through the awakening pin, and in the state, the central processing unit is not awakened. According to the method and the device, the embedded security control unit receives data, for example, data sent by a card reader or data sent by other equipment, and detects the received data.
Preferably, at step 104: when the received data is detected to be normal communication data, the embedded safety control unit outputs a low level to the central processing unit through the awakening pin.
In the application, the embedded security control unit detects the received data, and if the detected data is normal communication data sent by the card reader, the embedded security control unit outputs a low level to the central processing unit through the wake-up pin.
Preferably, at step 105: when the non-contact induction coil stops obtaining energy, the level output by the awakening pin of the embedded safety control unit is increased from low level to high level.
In the application, when the non-contact induction coil stops obtaining energy, for example, when the composite pass card has moved out of the card reading range of the card reader, the level output by the wake-up pin of the embedded security control unit is increased from the low level to the high level.
Preferably, at step 106: when the low level output by the awakening pin of the embedded safety control unit rises, the central processing unit enters a working state.
In the present application, when the low level output by the wake-up pin of the embedded security control unit rises, that is, only when the wake-up pin is at the rising edge level, the central processing unit is woken up to enter the working state.
Preferably, when the non-contact induction coil stops obtaining energy, the low level output by the wake-up pin of the embedded safety control unit rises until the wake-up pin of the embedded safety control unit outputs a high level.
Preferably, the embedded security control unit enters a sleep state.
Preferably, when the received data is detected to be abnormal communication data, the embedded security control unit outputs a high level to the central processing unit through the wake-up pin.
Fig. 2 is a schematic structural diagram of a system for preventing a composite pass card from being mistakenly awakened according to an embodiment of the invention. As shown in fig. 2, a system for preventing a composite pass card from being mistakenly woken up includes:
the non-contact induction coil 201 is used for acquiring energy by the composite pass card;
the embedded safety control unit 202 is triggered to enter a working state by the acquired energy; the embedded safety control unit enters a working state, the embedded safety control unit outputs a high level to the central processing unit 203 through the wakeup pin, and receives data through the embedded safety control unit 202, and the embedded safety control unit 202 detects the received data; when detecting that the received data is normal communication data, the embedded security control unit 202 outputs a low level to the central processing unit 203 through the wake-up pin; the non-contact induction coil stops acquiring energy, and the level output by the wake-up pin of the embedded safety control unit 202 is increased from a low level to a high level; the low level output by the wake-up pin of the embedded security control unit 202 rises and the central processing unit 203 enters an operating state.
Preferably, the non-contact induction coil 201, is further configured to: energy is captured by proximity to the reader.
Preferably, the non-contact induction coil 201 stops obtaining energy, and the low level output by the wake-up pin of the embedded safety control unit rises until the wake-up pin of the embedded safety control unit outputs a high level.
Preferably, the embedded security control unit enters a sleep state.
Preferably, the embedded security control unit comprises a 13.56MHz contactless channel interface and a 7816 interface.
Preferably, the 13.56MHz non-contact channel interface is connected to a non-contact induction coil, and when the embedded safety control unit is in an operating state, energy is obtained through the non-contact induction coil.
Preferably, when the received data is detected to be abnormal communication data, the embedded security control unit outputs a high level to the central processing unit through the wake-up pin.
According to the application, when the composite access card CPC is close to the card reader, the non-contact induction coil 201 provides energy to trigger the embedded security control unit 202ESAM to work, the embedded security control unit 202ESAM and the card reader perform data interaction, when a normal communication frame is detected, the embedded security control unit 202ESAM outputs a low level through the awakening pin, when the composite access card CPC leaves a non-access field, the embedded security control unit 202ESAM outputs a high level through the awakening pin, the central processing unit 203MCU is in a dormant state at ordinary times, and when the embedded security control unit 202ESAM awakening pin is detected to be changed from low to high, the central processing unit 203MCU is awakened to enter a working state.
The dual-interface embedded security control unit 202ESAM is provided with a 13.56MHz non-access channel interface and a 7816 interface, the non-access channel interface is connected with a 13.56MHz induction coil, when the embedded security control unit 202ESAM and a card reader carry out data interaction, working energy is obtained from the coil, the electric quantity of a battery is not consumed, the embedded security control unit 202ESAM judges whether data of the card reader is legal or not, and only the legal data embedded security control unit 202ESAM outputs a wake-up signal through a wake-up pin to wake up the MCU 203.
The wake-up pin is normally at a high level, and is at a low level after detecting a normal communication frame, and outputs the high level after detecting that the wake-up pin leaves a non-connected field.
Fig. 3 is a schematic diagram illustrating a level change of a wake-up pin according to an embodiment of the invention. As shown in fig. 3, T1 is that the composite pass card CPC does not detect a valid data frame, and the wake-up pin is always in the high level period; t2 is that after the legal data frame is detected, the level is changed from high level to low level until the departure of the non-field-connecting period is detected; t3 is the period when the level changes from low level to high level after the non-contact field strength is detected.
Setting a central processing unit MCU wake-up pin as input and the rising edge is interrupted, wherein the central processing unit MCU is in a dormant state at ordinary times, and only when the rising edge level is detected, the central processing unit MCU can be waken up to be in a working state. If the signal is a disturbed non-connected field of 13.56MHz, the wake-up pin can not generate legal high-low level change, so the MCU can not be woken up.
In the application, the 13.56MHz wake-up circuit of the composite access card CPC is composed of a non-contact induction coil 201, a dual-interface embedded security control unit 202ESAM and a central processing unit MCU 203. If the composite access card CPC is only used for detecting the field intensity, the composite access card CPC is woken up frequently by the interfered field of 13.56MHz, so that the battery power consumption is caused, and if the battery power is too low, the composite access card CPC can not work. The embodiment of the invention detects the field intensity and whether the communication frame is normal or not, and only wakes up the central processing unit MCU of the composite pass CPC to work, thereby preventing the composite pass card CPC from being awoken by mistake, prolonging the service life of the product and improving the reliability of the product.
The composite traffic card CPC integrates the communication functions of 5.8GHz and 13.56MHz, supports the reading and writing functions of entrance information and path information, and provides reusable traffic media for vehicles and for retrieving from an exit lane in an entrance lane of a closed toll road toll station.
The CPC card is powered by a battery, and can be mistakenly awakened if frequently interfered by a 13.56MHz field, so that unnecessary electric energy loss is caused, and the service life of the product is influenced. The invention provides a method for resisting false awakening of a 13.56MHz interference field, which prolongs the service life of a CPC card.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (6)
1. A method of preventing a composite passcard from being mistakenly woken up, the method comprising:
the composite pass card obtains energy through the non-contact induction coil;
triggering the embedded safety control unit to enter a working state by using the acquired energy;
when the embedded safety control unit enters a working state, the embedded safety control unit outputs a high level to the central processing unit through the awakening pin; receiving data through the embedded safety control unit, and detecting the received data by the embedded safety control unit;
when the received data is detected to be normal communication data, the embedded safety control unit outputs a low level to the central processing unit through the awakening pin;
when the non-contact induction coil stops obtaining energy, the level output by the awakening pin of the embedded safety control unit is increased from a low level to a high level, and the method comprises the following steps: when the non-contact induction coil stops acquiring energy, the low level output by the awakening pin of the embedded safety control unit rises until the awakening pin of the embedded safety control unit outputs high level; the embedded safety control unit enters a dormant state;
when the low level output by the awakening pin of the embedded safety control unit rises, the central processing unit enters a working state;
the embedded safety control unit comprises a 13.56MHz non-contact channel interface and a 7816 interface;
the 13.56MHz non-contact channel interface is connected with the non-contact induction coil, and when the embedded safety control unit is in a working state, energy is obtained through the non-contact induction coil.
2. The method of claim 1, the harvesting energy by a non-contact induction coil, comprising:
the non-contact inductive coil draws power by proximity to the reader.
3. The method of claim 1, wherein the embedded security control unit outputs a high level to the central processing unit via a wake-up pin when the received data is detected to be abnormal communication data.
4. A system for preventing a composite access card from being mistakenly woken up, the system comprising:
the composite pass card acquires energy through the non-contact induction coil;
the embedded safety control unit is triggered to enter a working state by utilizing the acquired energy; the embedded safety control unit enters a working state, outputs a high level to a central processing unit through a wake-up pin, receives data through the embedded safety control unit, and detects the received data; when the received data is detected to be normal communication data, the embedded safety control unit outputs a low level to the central processing unit through the awakening pin; the non-contact induction coil stops obtaining energy, the level output by the awakening pin of the embedded safety control unit is increased from low level to high level, and the method comprises the following steps: the non-contact induction coil stops acquiring energy, and the low level output by the awakening pin of the embedded safety control unit rises until the awakening pin of the embedded safety control unit outputs high level; the embedded safety control unit enters a dormant state; the low level output by the awakening pin of the embedded safety control unit rises, and the central processing unit enters a working state;
the embedded safety control unit comprises a 13.56MHz non-contact channel interface and a 7816 interface; the 13.56MHz non-contact channel interface is connected with the non-contact induction coil, and when the embedded safety control unit is in a working state, energy is obtained through the non-contact induction coil.
5. The system of claim 4, the non-contact induction coil, further to:
energy is captured by proximity to the reader.
6. The system of claim 4, wherein the embedded security control unit outputs a high level to the central processing unit via a wake-up pin when detecting that the received data is abnormal communication data.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711297228.1A CN108038924B (en) | 2017-12-08 | 2017-12-08 | Method and system for preventing composite pass card from being awoken by mistake |
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| CN201711297228.1A CN108038924B (en) | 2017-12-08 | 2017-12-08 | Method and system for preventing composite pass card from being awoken by mistake |
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| CN108038924B true CN108038924B (en) | 2021-04-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2004297345A (en) * | 2003-03-26 | 2004-10-21 | Seiko Epson Corp | Non-contact identification tag, non-contact data communication system, non-contact identification tag control program, data communication equipment, and data communication equipment control program |
| CN201111118Y (en) * | 2007-06-15 | 2008-09-03 | 深圳市金溢科技有限公司 | Double-wake-up double-frequency composite traffic card for recognizing ambiguity path |
| US7982609B2 (en) * | 2008-06-18 | 2011-07-19 | Microsoft Corporation | RFID-based enterprise intelligence |
| CN102082587B (en) * | 2009-12-01 | 2015-05-20 | 中兴通讯股份有限公司 | Data communication method and system of vehicle-mounted unit |
| CN103731908B (en) * | 2013-03-22 | 2017-03-22 | 深圳市金溢科技股份有限公司 | OBU wrong wakeup preventing method and system and OBU |
| CN104217229B (en) * | 2013-06-04 | 2017-06-16 | 深圳市金溢科技股份有限公司 | Height wakes up sensitivity card, OBU, OBU component and communication means |
| KR20150021663A (en) * | 2013-08-21 | 2015-03-03 | 삼성에스디에스 주식회사 | Traffic service terminal device that have integration type network interface and control method thereof |
| CN204595938U (en) * | 2015-02-06 | 2015-08-26 | 深圳市金溢科技股份有限公司 | High sensitivity DSRC wake-up circuit, compound visa card and board units |
| CN204390314U (en) * | 2015-02-06 | 2015-06-10 | 深圳市金溢科技股份有限公司 | 5.8GHz Path Recognition compound visa card |
| CN105184352B (en) * | 2015-09-02 | 2018-08-03 | 深圳市金溢科技股份有限公司 | A kind of communication means and the compound password card of compound password card and single-frequency reader |
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Inventor after: Feng Yongping Inventor after: Sun Zhiqiang Inventor after: Zhang Daixiang Inventor after: Tian Guiyuan Inventor after: Zhang Mingsong Inventor before: Feng Yongping |
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