CN110504741B - Smart card and power supply switching circuit of smart card - Google Patents
Smart card and power supply switching circuit of smart card Download PDFInfo
- Publication number
- CN110504741B CN110504741B CN201811074971.5A CN201811074971A CN110504741B CN 110504741 B CN110504741 B CN 110504741B CN 201811074971 A CN201811074971 A CN 201811074971A CN 110504741 B CN110504741 B CN 110504741B
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- voltage
- smart card
- voltage conversion
- switching
- contact
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 63
- 239000003990 capacitor Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
Classifications
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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
-
- 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
- G06K19/0701—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 at least one of the integrated circuit chips comprising an arrangement for power management
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
本发明属于智能卡技术领域，提供了一种智能卡和智能卡的电源切换电路。该智能卡的电源切换电路与所述智能卡的负载连接，其包括：7816触点，被配置为与接触读卡器电连接以通信；NFC天线，被配置为与NFC读卡器无线通信；第一电压转换单元，与所述7816触点连接，被配置为将所述7816触点输出的触点电压转换为第一电压；第二电压转换单元，与所述NFC天线连接，被配置为将所述NFC天线输出的天线电压转换为第二电压；切换单元，分别与所述第一电压转换单元和所述第二电压转换单元连接，被配置为选择所述第一电压或所述第二电压对所述负载供电。
The present invention belongs to the technical field of smart cards, and provides a smart card and a power switching circuit of the smart card. The power switching circuit of the smart card is connected to the load of the smart card, and includes: 7816 contacts, configured to be electrically connected to a contact card reader for communication; an NFC antenna, configured to wirelessly communicate with an NFC card reader; a first voltage conversion unit, connected to the 7816 contacts, configured to convert the contact voltage output by the 7816 contacts into a first voltage; a second voltage conversion unit, connected to the NFC antenna, configured to convert the antenna voltage output by the NFC antenna into a second voltage; and a switching unit, respectively connected to the first voltage conversion unit and the second voltage conversion unit, configured to select the first voltage or the second voltage to power the load.
Description
Technical Field
The invention belongs to the technical field of smart cards, and particularly relates to a smart card and a power supply switching circuit of the smart card.
Background
Near Field Communication (NFC) is a short-range high-frequency radio technology, operating at 13.56MHz, with transmission speeds of 106 Kbit/s, 212 Kbit/s or 424 Kbit/s. Near field communication has passed through the technology which becomes the international standard of ISO/IEC 18092, the ECMA-340 standard and the ETSI TS 102 190 standard. 7816 is a smart card standard ISO/IEC 7816 published by the international standardization organization, and specifies related specifications of the contact smart card, including physical characteristics, interface specifications, transmission protocols and command exchange formats, where 7816 contacts are the physical interface of the standard, and are also the contact physical interface of the smart card with the outside.
For the smart card with 7816 contacts and NFC power supply, the 7816 contacts and the NFC power supply line are connected to a power supply circuit through diodes respectively, when the power load on the smart card is large, the current flowing through the diodes is large, the voltage drop is large on the diodes, and the power supply requirements of loads with high requirements on the power supply voltage cannot be met, so that the smart card system is unstable in operation.
Disclosure of Invention
The invention aims to provide a smart card and a power supply switching circuit of the smart card, and aims to solve the problem that the smart card system works unstably because the power supply requirements of loads with higher power supply voltage requirements cannot be met in the traditional technical scheme.
A power switching circuit of a smart card connected to a load of the smart card, the power switching circuit of the smart card comprising:
7816 contacts configured to electrically connect with a contact reader for communication;
An NFC antenna configured to wirelessly communicate with an NFC reader;
A first voltage conversion unit connected to the 7816 contact and configured to convert a contact voltage output from the 7816 contact into a first voltage;
A second voltage conversion unit connected with the NFC antenna and configured to convert an antenna voltage output by the NFC antenna into a second voltage;
and the switching unit is connected with the first voltage conversion unit and the second voltage conversion unit respectively and is configured to select the first voltage or the second voltage to supply power to the load.
In one embodiment, the comparing unit is connected between the 7816 contact and the NFC antenna, and is configured to compare the contact voltage with the antenna voltage, and output a power to the switching unit according to a comparison result.
In one embodiment, the comparing unit includes a first diode, a positive electrode of the first diode is connected to the 7816 contact, a negative electrode of the first diode is connected to the NFC antenna, and the NFC antenna is connected to a power end of the switching unit.
In one embodiment, the first voltage conversion unit includes a first voltage conversion chip, an input end of the first voltage conversion chip is connected to the 7816 contact, and an output end of the first voltage conversion chip is connected to the switching unit.
In one embodiment, the second voltage conversion unit includes a second voltage conversion chip, an input end of the second voltage conversion chip is connected to the NFC antenna, and an output end of the second voltage conversion chip is connected to the switching unit.
In one embodiment, the switching unit includes a switching chip, a first input end of the switching chip is connected to the first voltage conversion unit, a second input end of the switching chip is connected to the second voltage conversion unit, a control end of the switching chip is connected to an output end of the first voltage conversion unit, and an output end of the switching chip is connected to the load.
In one embodiment, the power supply switching circuit of the smart card further includes a second diode, an anode of the second diode is connected to the output end of the first voltage conversion unit, a cathode of the second diode is connected to the NFC antenna, and a cathode of the second diode is further connected to the power supply end of the switching unit.
In addition, a smart card is provided, and the smart card comprises a load and a power supply switching circuit of the smart card connected with the load.
According to the power supply switching circuit of the smart card, the contact voltage output by the 7816 contact is converted into the first voltage through the first voltage conversion unit, the antenna voltage output by the NFC antenna is converted into the second voltage through the second voltage conversion unit, and the switching unit selects the first voltage or the second voltage to supply power to the load. The switching unit with lower power consumption is used for switching the power supply of the load, so that the power supply requirement of the load is ensured, and the stability of the system of the intelligent card is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a power switching circuit of a smart card according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of an example of a first voltage conversion unit in the power switching circuit of the smart card shown in FIG. 1;
FIG. 3 is a schematic diagram of an exemplary circuit of a second voltage conversion unit in the power switching circuit of the smart card shown in FIG. 1;
fig. 4 is a schematic circuit diagram of an example of a switching unit in the power switching circuit of the smart card shown in fig. 1.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Fig. 1 is a schematic diagram of a power switching circuit of a smart card according to a preferred embodiment of the present invention, and for convenience of explanation, only the portions related to the present embodiment are shown, which are described in detail below:
As shown in fig. 1, the power switching circuit 1 of the smart card is connected to the load 2 of the smart card, and the power switching circuit 1 of the smart card includes a 7816 contact 10, an NFC antenna 20, a first voltage converting unit 30, a second voltage converting unit 40, and a switching unit 50. The switching unit 50 is used for judging the access power supply and gating the corresponding power supply to the rear-end load 2, so that the power supply type accessed according to the use scene of the smart card is realized, the corresponding power supply is selected, the switching of the load power supply is performed through the switching unit with lower power consumption, the circuit loss is reduced, the power supply requirement of the load is ensured, and the stability of the system of the smart card is ensured.
Wherein the 7816 contacts 10 are configured to electrically connect to communicate with the contact reader to provide the smart card with the required power while enabling communication of the smart card with the contact reader, the 7816 contacts 10 communicating with the contact reader satisfying the 7816 protocol. The NFC antenna 20 is configured to wirelessly communicate with an NFC reader through which the smart card communicates with the NFC reader, and to obtain data and power through the induction coil.
As shown in fig. 2, the first voltage conversion unit 30 is connected to the 7816 contact 10 and is configured to convert the contact voltage 7816_vcc output by the 7816 contact 10 into a first voltage card_vcc, where the first voltage conversion unit 30 includes a first voltage conversion chip U1, an input terminal of the first voltage conversion chip U1 is connected to the 7816 contact 10, and an output terminal of the first voltage conversion chip U1 is connected to the switching unit 50. Further, the first voltage conversion unit 30 further includes a first capacitor C1 and a second capacitor C2, the first capacitor C1 is connected between the input terminal of the first voltage conversion chip U1 and ground, and the second capacitor C2 is connected between the output terminal of the first voltage conversion chip U1 and ground.
As shown in fig. 3, the second voltage conversion unit 40 is connected to the NFC antenna 20 and is configured to convert the antenna voltage ant_vcc output by the NFC antenna 20 into a second voltage nfc_vcc, where the second voltage conversion unit 40 includes a second voltage conversion chip U2, an input end of the second voltage conversion chip U2 is connected to the NFC antenna 20, and an output end of the second voltage conversion chip U2 is connected to the switching unit 50. Further, the second voltage converting unit 40 further includes a third capacitor C3 and a fourth capacitor C4, the third capacitor C3 is connected between the input terminal of the second voltage converting chip U2 and ground, and the fourth capacitor C4 is connected between the output terminal of the second voltage converting chip U2 and ground.
As shown in fig. 4, the switching unit 50 is connected to the first voltage converting unit 30 and the second voltage converting unit 40, respectively, and is configured to select the first voltage card_vcc or the second voltage nfc_vcc to supply power to the load 2. The switching unit 50 includes a switching chip U3, a first input terminal of the switching chip U3 is connected to the first voltage converting unit 30, a second input terminal of the switching chip U3 is connected to the second voltage converting unit 40, a control terminal of the switching chip U3 is connected to an output terminal of the first voltage converting unit 30, and an output terminal of the switching chip U3 is connected to the load 2. The first voltage converting unit 30 and the second voltage converting unit 40 are connected to the switching unit 50 for gating, the first voltage card_vcc converted from the contact voltage 7816_vcc output by the 7816 contact 10 is the control logic of the switching chip U3, when the 7816 contact 10 is powered on, the switching unit 50 connects the first voltage card_vcc to the load 2,7816, and when the contact 10 is not powered on, the switching unit 50 connects the second voltage nfc_vcc to the load 2.
Further, a comparing unit 60 is further included, and the comparing unit 60 is between the 7816 contact 10 and the NFC antenna 20, and is configured to compare the contact voltage 7816_vcc with the antenna voltage ant_vcc, and output a power to the switching unit 50 according to a comparison result of the comparing unit 60. The comparing unit 60 includes a first diode D1, the positive electrode of the first diode D1 is connected to the 7816 contact 10, the negative electrode of the first diode D1 is connected to the NFC antenna 20, and the NFC antenna 20 is connected to the power end of the switching unit 50.
When the smart card is inserted into the contact card reader, 7816 contact 10 is connected to electricity, contact voltage 7816_vcc has voltage, antenna voltage ant_vcc has no voltage, first diode D1 is turned on, and switching unit 50 is powered by contact voltage 7816_vcc via first diode D1. At this time, the logic selection pin of the switching chip U3 is high, and the first voltage card_vcc output by the first voltage conversion unit 30 is connected to the load 2 to supply power to the load 2.
When the CARD is close to the NFC reader, the 7816 contact 10 has no voltage, the NFC antenna 20 senses and outputs an antenna voltage ant_vcc, the contact voltage 7816_vcc is 0, the first diode D1 is turned off, the antenna voltage ant_vcc is converted into a second voltage nfc_vcc by the second voltage conversion unit 40, meanwhile, the antenna voltage ant_vcc is supplied to the switching unit 50, the first voltage card_vcc is 0, the logic selection pin of the switching chip U3 is low, the second voltage nfc_vcc is connected to the load 2 to supply power to the load 2, and at this time, the first voltage conversion unit 30 does not work.
In one embodiment, the power switching circuit 1 of the smart card further includes a second diode D2, an anode of the second diode D2 is connected to the output end of the first voltage conversion unit 30, a cathode of the second diode D2 is connected to the NFC antenna 20, and a cathode of the second diode D2 is further connected to the power end of the switching unit 50. When the smart CARD is inserted into the contact CARD reader, the 7816 contact 10 is connected to the power supply, the contact voltage 7816_vcc has a voltage, the antenna voltage ant_vcc has no voltage, the power supply terminal of the switching unit 50 is powered by the first voltage card_vcc through the second diode D2, at this time, the logic selection pin of the switching chip U3 is high, and the first voltage card_vcc output by the first voltage conversion unit 30 is connected to the load 2 to supply power to the load 2.
When the CARD is close to the NFC reader, the 7816 contact 10 has no voltage, the NFC antenna 20 senses and outputs an antenna voltage ant_vcc, the contact voltage 7816_vcc is 0, the second diode D2 is turned off, the antenna voltage ant_vcc is converted into a second voltage nfc_vcc by the second voltage conversion unit 40, meanwhile, the antenna voltage ant_vcc is supplied to the switching unit 50, the first voltage card_vcc is 0, the logic selection pin of the switching chip U3 is low, the second voltage nfc_vcc is connected to the load 2 to supply power to the load 2, and at this time, the first voltage conversion unit 30 does not work.
In one embodiment, the first diode D1 and the second diode D2 are both present, when the smart card is inserted into the contact card reader, the 7816 contact 10 is connected, the contact voltage 7816_vcc has a voltage, the antenna voltage ant_vcc has no voltage, the first diode D1 is turned on, the second diode D2 is turned off, and the switching unit 50 is powered by the contact voltage 7816_vcc through the first diode D1. At this time, the logic selection pin of the switching chip U3 is high, and the first voltage card_vcc output by the first voltage conversion unit 30 is connected to the load 2 to supply power to the load 2.
When the CARD is close to the NFC reader, the 7816 contact 10 has no voltage, the NFC antenna 20 senses and outputs an antenna voltage ant_vcc, the contact voltage 7816_vcc is 0, the first diode D1 is turned off, the second diode D2 is turned off, the antenna voltage ant_vcc is converted into a second voltage nfc_vcc by the second voltage conversion unit 40, meanwhile, the antenna voltage ant_vcc is used for supplying power to the switching unit 50, the first voltage card_vcc is 0, the logic selection pin of the switching chip U3 is low, the second voltage nfc_vcc is connected to the load 2 to supply power to the load 2, and at this time, the first voltage conversion unit 30 does not work.
On the basis of the power supply switching circuit 1 of the smart card, the embodiment of the invention also provides the smart card, which comprises a load and the power supply switching circuit of the smart card connected with the load.
In summary, the embodiment of the present invention provides a smart card and a power switching circuit 1 of the smart card, wherein the power switching circuit 1 of the smart card includes a 7816 contact 10, an NFC antenna 20, a first voltage converting unit 30, a second voltage converting unit 40, and a switching unit 50. The switching unit 50 is used for judging the access power supply and gating the corresponding power supply to the rear-end load 2, so that the power supply type accessed according to the use scene of the smart card is realized, the corresponding power supply is selected, the switching of the load power supply is performed through the switching unit with lower power consumption, the circuit loss is reduced, the power supply requirement of the load is ensured, and the stability of the system of the smart card is ensured.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (5)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811074971.5A CN110504741B (en) | 2018-09-14 | 2018-09-14 | Smart card and power supply switching circuit of smart card |
| PCT/CN2019/103998 WO2020052461A1 (en) | 2018-09-14 | 2019-09-02 | Smart card and power switching circuit of smart card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811074971.5A CN110504741B (en) | 2018-09-14 | 2018-09-14 | Smart card and power supply switching circuit of smart card |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110504741A CN110504741A (en) | 2019-11-26 |
| CN110504741B true CN110504741B (en) | 2024-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811074971.5A Active CN110504741B (en) | 2018-09-14 | 2018-09-14 | Smart card and power supply switching circuit of smart card |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110504741B (en) |
| WO (1) | WO2020052461A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113627581A (en) * | 2021-08-17 | 2021-11-09 | 捷德(中国)科技有限公司 | Communication circuit, communication method and chip of NFC equipment and NFC equipment |
| CN117559797A (en) * | 2022-08-04 | 2024-02-13 | 华为技术有限公司 | Power supply circuit, control method thereof and electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6168083B1 (en) * | 1995-06-02 | 2001-01-02 | U.S. Philips Corporation | Chip-card with mode switching between contactless and contact-coupled mode |
| CN103825296A (en) * | 2013-11-15 | 2014-05-28 | 国家电网公司 | Dual power distribution power supply interface device for distributed power supply grid connection |
| CN208890472U (en) * | 2018-09-14 | 2019-05-21 | 深圳市文鼎创数据科技有限公司 | A kind of power supply switch circuit of smart card and smart card |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8013473B2 (en) * | 2006-09-01 | 2011-09-06 | Atmel Corporation | Detector based combination regulator |
| US7635925B2 (en) * | 2006-10-04 | 2009-12-22 | Atmel Corporation | Analog combination regulator |
| CN101533479B (en) * | 2008-03-11 | 2011-09-28 | 北京同方微电子有限公司 | Dual-interface smart card power source management circuit |
| JP5532678B2 (en) * | 2009-05-26 | 2014-06-25 | ソニー株式会社 | COMMUNICATION DEVICE, ANTENNA DEVICE, AND COMMUNICATION SYSTEM |
| CN102609022B (en) * | 2011-01-24 | 2015-01-07 | 上海华虹集成电路有限责任公司 | Power management circuit of dual interface card and method |
| TW201250601A (en) * | 2011-06-01 | 2012-12-16 | Ultracap Technologies Corp | Smart card with regenerative power |
| US20150357864A1 (en) * | 2014-06-06 | 2015-12-10 | Bayer Healthcare Llc | Power source switching apparatus and methods for dual-powered electronic devices |
| CN206060348U (en) * | 2016-09-09 | 2017-03-29 | 北京集创北方科技股份有限公司 | Power supply switch circuit |
| CN206461424U (en) * | 2017-02-10 | 2017-09-01 | 深圳市力通威电子科技有限公司 | The seamless switching circuit of dual power supply |
-
2018
- 2018-09-14 CN CN201811074971.5A patent/CN110504741B/en active Active
-
2019
- 2019-09-02 WO PCT/CN2019/103998 patent/WO2020052461A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6168083B1 (en) * | 1995-06-02 | 2001-01-02 | U.S. Philips Corporation | Chip-card with mode switching between contactless and contact-coupled mode |
| CN103825296A (en) * | 2013-11-15 | 2014-05-28 | 国家电网公司 | Dual power distribution power supply interface device for distributed power supply grid connection |
| CN208890472U (en) * | 2018-09-14 | 2019-05-21 | 深圳市文鼎创数据科技有限公司 | A kind of power supply switch circuit of smart card and smart card |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110504741A (en) | 2019-11-26 |
| WO2020052461A1 (en) | 2020-03-19 |
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