JP2013065159A - Electronic medium, and power supply method for electronic medium - Google Patents

Electronic medium, and power supply method for electronic medium Download PDF

Info

Publication number
JP2013065159A
JP2013065159A JP2011202848A JP2011202848A JP2013065159A JP 2013065159 A JP2013065159 A JP 2013065159A JP 2011202848 A JP2011202848 A JP 2011202848A JP 2011202848 A JP2011202848 A JP 2011202848A JP 2013065159 A JP2013065159 A JP 2013065159A
Authority
JP
Japan
Prior art keywords
control unit
switch
turned
electronic
power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2011202848A
Other languages
Japanese (ja)
Other versions
JP5765159B2 (en
Inventor
Kentaro Aoki
健太郎 青木
Original Assignee
Dainippon Printing Co Ltd
大日本印刷株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dainippon Printing Co Ltd, 大日本印刷株式会社 filed Critical Dainippon Printing Co Ltd
Priority to JP2011202848A priority Critical patent/JP5765159B2/en
Publication of JP2013065159A publication Critical patent/JP2013065159A/en
Application granted granted Critical
Publication of JP5765159B2 publication Critical patent/JP5765159B2/en
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

Links

Images

Abstract

An electronic medium, such as an IC card with a display function, which can reduce power consumption and prevent malfunctions when power supply is turned off.
In an IC card with a display function, a switch 4 that is a push switch and an electronic switch 27a are connected in parallel between a power source 25 and a control unit 21, and when the switch 4 is turned on, the power source 25 switches to the control unit 21. When the power is supplied, the control unit 21 is activated, the electronic switch 27a is turned on by the control of the activated control unit 21, and the power supply is maintained even when the switch 4 is turned off. The control unit 21 shuts down after executing a predetermined program, turns off the electronic switch 27a, turns on the electronic switch 27b, and cuts off the power supply during non-operation. Further, when the electronic switch 27b is turned on, the control unit 21 and the ground 26 are connected, and the voltage of the control unit 21 drops rapidly.
[Selection] Figure 4

Description

  The present invention relates to an electronic medium such as an IC card with a display function, and a power supply method in the electronic medium.

  In recent years, an IC (Integrated Circuit) card body having various functions has been developed. In one such IC card with a function, data such as the balance of electronic money acquired by contact type or non-contact type communication is stored in an IC chip, and this is displayed on a display by control of a control unit such as a display CPU. There is an IC card with a display function (see Patent Document 1).

  In such an IC card, processing by a control unit activated by turning on a mechanical contact type push switch is conventionally performed. FIG. 6 is a diagram showing an example thereof. In FIG. 6, 101 indicates a control unit, 103 indicates a push switch, and 105 indicates a power source.

  The control unit 101 receives a standby current from a power source 105 such as a battery when not operating, and is in a standby state. However, when the push switch 103 is pressed, the control unit 101 is activated by receiving a signal, and data such as an electronic money balance stored in the IC chip. Processes such as displaying.

JP 2007-133563 A

Such an IC card with a display function is required to operate while saving power as much as possible from the viewpoint of extending the life of the battery. However, in the above method, even when the switch is in the OFF state, the standby current is supplied and power is consumed.
As a configuration that does not consume standby current, it may be possible to switch the power supply on and off completely between operating and non-operating using a slide type switch, etc., but a switch that can be mounted on a thin one such as an IC card For example, it is difficult to mount a slide type switch.

Further, in such an IC card with a display function, when the power supply to the control unit 101 is turned off, the voltage of the control unit 101 needs to be quickly reduced.
That is, the control unit 101 is configured by a microcomputer circuit or the like, and a large capacitance component is often connected to the microcomputer circuit between the ground and the control unit 101 even when the power supply is turned off. The voltage drop may be gradual. The minimum operating voltage is set in the control unit 101, and when the voltage drop becomes gentle, the time for the voltage value near the minimum operating voltage becomes long, which may cause malfunction of the control unit 101.

  The present invention has been made in view of the above-described problems, and an object thereof is an electronic medium such as an IC card with a display function capable of reducing power consumption and preventing malfunction or the like when power supply is turned off. Etc. is to provide.

  According to a first aspect of the present invention for achieving the above object, there is provided a power source, a control unit, a push switch that is turned on when pressed and supplied with power from the power source to the control unit, and controlled by the control unit. A first electronic switch that is turned on by the power supply to supply power to the control unit, and that is turned off by the control by the control unit to cut off power supply from the power supply to the control unit; A second electronic switch connected to the ground, and the push switch and the first electronic switch are connected in parallel between the power source and the control unit, and the push switch is turned on. The power is supplied from the power source to the control unit to activate the control unit, and the first electronic switch is turned on by the control of the activated control unit, Control unit is an electronic medium, wherein the second electronic switch is turned on while turning off the shut down the first electronic switch after executing a predetermined program.

  The first electronic switch is a high-side switch in which power is supplied from the power source to the control unit by turning on the switch transistor when the control input transistor is turned on by the control of the control unit. It is desirable to use a small signal MOS transistor as the control input transistor and the switch transistor.

  Further, it is desirable that the second electronic switch is a switch transistor, and a small signal MOS transistor is used as the switch transistor.

  In addition, the electronic medium is an IC card with a display function further including an IC chip and a display unit, and data stored in the IC chip is displayed on the display unit by executing the predetermined program. It is desirable.

  According to a second aspect of the invention for achieving the above object, there is provided a power source, a control unit, a push switch that is turned on when pressed and supplied with power from the power source to the control unit, and controlled by the control unit. A first electronic switch that is turned on by the power supply to supply power to the control unit, and that is turned off by the control by the control unit to cut off power supply from the power supply to the control unit; A power supply method in an electronic medium, wherein the control unit includes a second electronic switch connected to a ground, and the push switch and the first electronic switch are connected in parallel between the power source and the control unit When the push switch is turned on, power is supplied from the power source to the control unit and the control unit is activated. An electronic medium characterized in that a first electronic switch is turned on and the control unit executes a predetermined program to shut down and turn off the first electronic switch and turn on the second electronic switch. It is the electric power supply method in.

  The first electronic switch is a high-side switch in which power is supplied from the power source to the control unit by turning on the switch transistor when the control input transistor is turned on by the control of the control unit. It is desirable to use a small signal MOS transistor as the control input transistor and the switch transistor.

  Further, it is desirable that the second electronic switch is a switch transistor, and a small signal MOS transistor is used as the switch transistor.

  The electronic medium is an IC card with a display function further including an IC chip and a display unit, and the data stored in the IC chip is displayed on the display unit by executing the predetermined program. desirable.

With the above-described configuration, the electronic medium is configured such that the standby current from the power source when the control unit is not operating is omitted, and the first electronic switch is controlled by the control of the control unit that is supplied with power by turning on the push switch during operation. To ensure power supply when the push switch is turned off. Then, when the predetermined program is executed and the process is completed, the first electronic switch is turned off and the second electronic switch is turned on to connect the control unit to the ground.
Thereby, it is possible to perform processing by the control unit when the push switch is turned on while reducing power consumption during standby. Further, when the power supply is cut off by turning off the first electronic switch, the second electronic switch is turned on and the control unit is connected to the ground, so that the voltage of the control unit is quickly reduced to the ground level, as described above. Such a malfunction of the control unit can be prevented.

In addition, by using the first electronic switch as a high-side switch and using a small-signal MOS transistor as a transistor constituting the first electronic switch, power consumption for switch control such as bias current can be reduced, and leakage during non-operation is also possible. Current can also be suppressed.
Further, by using a small-signal MOS transistor as the second electronic switch, similarly to the above, power consumption for switch control can be reduced, and leakage current during non-operation can be suppressed.
In addition, in an electronic medium, an IC card with a display function that operates with less power can be configured by performing processing for displaying data stored in the IC chip on the display unit by executing a program by the control unit. Since an IC card with a display function is generally thin, it is required to provide a push switch with a simple configuration, and the above power saving method is particularly effective.

  According to the present invention, it is possible to provide an electronic medium such as an IC card with a display function that can reduce power consumption and prevent malfunctions when power supply is turned off.

External view of IC card 1 with display function The figure which shows the structure of IC card 1 with a display function Diagram showing the flow of power supply method The figure shown about schematic structure of switch 4 and electronic switch 27a, 27b The figure which shows the example of the electronic switch circuit 27 The figure explaining schematic structure of the conventional control part 101, the push switch 103, and the power supply 105

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, the appearance of an IC card 1 with display function (electronic medium) according to an embodiment of the present invention will be described with reference to FIG.

  The IC card 1 with a display function shown in FIG. 1 records data such as the balance of electronic money on an IC chip by performing non-contact and contact communication, and displays the data under the control of a control unit. The surface of the card body 2 has a display 3, a switch 4, and a contact terminal 5 for performing contact type communication. These arrangements are not limited to those shown in FIG.

The display 3 is a liquid crystal display, electronic paper, or the like, for example, and displays data such as characters.
The switch 4 is a mechanical contact type push switch.
The contact terminal 5 is in contact with an external reader / writer terminal when performing contact-type communication. When contact-type communication is performed, data or power for driving the IC chip is received via the contact terminal 5. Supplied.

  FIG. 2 is a diagram showing a configuration of the IC card 1 with a display function. The IC card 1 with a display function includes a control unit 21, a display driver 23, a display 3, a power supply 25, a switch 4, an electronic switch circuit 27, an IC chip 28, an antenna 29, and the like.

  The control unit 21 receives power from the power supply 25 and displays data on the display 3. The control unit 21 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an EEPROM. (Electrically Erasable and Programmable ROM) and the like, and a microcomputer circuit or the like such as a microcomputer in which external input / output terminals are integrated into one chip. A ROM or the like stores a program for performing control according to a power supply method described later, and a predetermined program for executing various processes and performing the functions of the IC card 1 with a display function.

  The display driver 23 is connected to the display 3 and drives the display 3 according to control by the control unit 21. The display 3 displays data according to control by the control unit 21.

  The power source 25 is a battery that supplies power to the control unit 21 and may be of any type, such as a primary battery or a secondary battery.

  The switch 4 is a mechanical contact type push switch as described above, and is turned on when being touched and pressed, and power is supplied from the power source 25 to the control unit 21. When the switch 4 is released and the press is released, the switch 4 is turned off.

  The electronic switch circuit 27 includes an electronic switch 27a (first electronic switch) and an electronic switch 27b (second electronic switch).

The electronic switch 27 a is a high side switch and is a switch for supplying power from the power supply 25 to the control unit 21. When the control unit 21 is not in operation, the control unit 21 is in an off state, but is turned on by the control of the control unit 21 to which power is supplied when the switch 4 is turned on. During the shutdown operation of the control unit 21, the control unit 21 is turned off and the power supply is cut off.
The switch 4 and the electronic switch 27 a are connected in parallel between the control unit 21 and the power supply 25.

  The electronic switch 27b is a switch for connecting the control unit 21 and the ground. The electronic switch 27b is turned off when the electronic switch 27a is turned on, and the connection between the control unit 21 and the ground is cut off. The electronic switch 27a is turned off and turned on, and the control unit 21 and the ground are connected.

The IC chip 28 includes a CPU, ROM, RAM, EEPROM, and the like. The IC chip 28 is a dual interface IC chip having an interface for performing contactless communication and contact communication.
The IC chip 28 communicates with an external card reader / writer and executes data processing according to a program stored in the ROM. For example, data such as electronic money balance is received from the card reader / writer and stored in the EEPROM.

  The antenna 29 is an antenna for the IC chip 28 to perform non-contact communication with the card reader / writer. During communication of the IC chip 28, the antenna 29 generates an AC voltage by the magnetic field generated from the reader / writer, and the IC chip 28 is driven thereby. The antenna 29 is provided around the inside of the card body 2, and both ends thereof are connected to the IC chip 28.

Next, a power supply method for supplying power from the power supply 25 to the control unit 21 (and cutting off the power supply) will be described with reference to FIGS. 3 and 4.
FIG. 3 is a diagram illustrating a flow of the power supply method. FIG. 4 is a diagram showing a schematic configuration of the switch 4 and the electronic switches 27a and 27b.

  As shown in FIG. 3, in the power supply method of the present embodiment, first, when the switch 4 is pressed and turned on (step S101), the power source 25 shown in FIG. Electric power is supplied as shown by an arrow a through the conducted circuit. When the release of the switch 4 is released, the switch 4 is turned off and the power supply indicated by the arrow a is cut off.

The control unit 21 is activated upon receiving the power supply from the power supply 25, and first turns on the electronic switch 27a shown in FIG. 4 and turns off the electronic switch 27b (step S102). As a result, electric power is supplied to the control unit 21 as shown by an arrow b in FIG. 4 through a circuit that is turned on when the electronic switch 27a is turned on.
Therefore, if the switch 4 is turned on by a single momentary pressing, the power supply from the power source 25 is maintained even if the switch 4 is subsequently released. The connection between the control unit 21 and the ground 26 is cut off by turning off the electronic switch 27b.

  Thereafter, the control unit 21 executes a predetermined program stored in the ROM or the like (step S103). In the present embodiment, by executing a program, data such as the electronic money balance stored in the IC chip 28 is acquired, and display processing for displaying the data on the display 3 for a certain period of time is performed. For this reason, in step S <b> 102, driving power is supplied from the power source 25 to the IC chip 28 via the control unit 21.

  When the above process ends, the control unit 21 shuts down, turns off the electronic switch 27a, and turns on the electronic switch 27b (step S104). When the electronic switch 27a is turned off, the power supply from the power supply 25 indicated by the arrow b in FIG. 4 to the control unit 21 is cut off, and the power supply during non-operation is cut off. In addition, since the control unit 21 and the ground 26 are connected when the electronic switch 27b is turned on, the voltage of the control unit 21 drops quickly, and the above-described error due to the gradual drop of the voltage drop of the control unit 21 as described above. Operation is prevented.

FIG. 5 is a diagram showing the electronic switch circuit 27 including the electronic switches 27a and 27b.
In FIG. 5, 31 is a control input transistor (N type). Reference numeral 33 denotes a switch transistor (P type) between the power supply 25 and the output terminal 39, which corresponds to the electronic switch 27a in FIG. The switch transistor 33 (electronic switch 27a) is configured as a high-side switch.
A switch transistor (N-type) 34 between the output terminal 39 and the ground 30 corresponds to the electronic switch 27b in FIG.
As these transistors, enhancement-type small signal MOS (Metal Oxide Semiconductor) type transistors (field effect transistors) are used in order to suppress leakage current and current consumption during operation.

Reference numeral 37 denotes a control terminal connected from the control unit 21, and power is supplied from the control unit 21 to turn on the switch transistor 33 and turn off the switch transistor 34.
Reference numeral 39 denotes an output terminal connected to the control unit 21. When the switch transistor 33 is turned on, power is supplied from the VDD (power supply 25) to the control unit 21 via the output terminal 39.
Reference numeral 30 denotes a ground, which corresponds to the ground 26 in FIG.

Reference numerals 41 and 43 denote control bias currents for the control input transistor 31 and the switch transistors 33 and 34, respectively. Resistors 35a to 35c are provided to appropriately determine these values.
Further, the electronic switch circuit 27 is provided with a resistor 35d for appropriately determining the current flowing through the switch transistor 34 when the output terminal 39 and the ground 30 are connected (short circuit).
Reference numeral 45 denotes a current for operation of the control unit 21.

  In step S <b> 102, power is supplied from the control unit 21 via the control terminal 37 under the control of the control unit 21. As a result, the gate voltage of the control input transistor 31 rises and switches on, and a current from VDD (power source 25) flows from the terminal A in the figure to the control input transistor 31 side. As a result, the gate voltage of the switch transistor 33 drops, so that the switch transistor 33 is switched on, and power is supplied from the VDD (power supply 25) to the control unit 21 via the output terminal 39. At this time, the gate voltage of the switch transistor 34 also drops similarly, whereby the switch transistor 34 is turned off, and the connection between the output terminal 39 connected to the control unit 21 and the ground 30 is cut off. That is, the connection between the control unit 21 and the ground 26 (ground 30) shown in FIG. 4 is cut off.

  On the other hand, in step S104, the supply of power via the control terminal 37 is stopped under the control of the control unit 21. As a result, the switch of the control input transistor 31 is turned off. In this case, the gate voltage of the switch transistor 33 rises, the switch of the switch transistor 33 is turned off, and power supply to the control unit 21 via the output terminal 39 is interrupted. On the other hand, the gate voltage of the switch transistor 34 similarly rises, whereby the switch transistor 34 is turned on, and the output terminal 39 connected to the control unit 21 is connected to the ground 30. That is, the control unit 21 and the ground 26 (ground 30) shown in FIG. 4 are connected.

Here, since the small signal MOS transistors are used as the control input transistor 31 and the switch transistors 33, 34, the amount of the control input transistor control bias current 41 and the switch transistor control bias current 43 can be reduced. The entire circuit can be controlled with low power consumption.
In this embodiment, for example, when the voltage of the power supply 25 is 3 V, the bias currents 41 and 43 can be set to about 1 μA, respectively, and the current consumed during operation can be suppressed to about 2 μA. The values of the resistors 35a, 35b, and 35c are determined in accordance with the values of the bias currents 41 and 43. As described above, the value of the resistor 35d is determined so that the current flowing through the switch transistor 34 at the time of connection between the output terminal 39 and the ground 30 is an appropriate value, for example, about 100Ω.
Further, by using a small-signal MOS transistor, the leakage current during non-operation is extremely small, and this can be suppressed to less than several nA.

As described above, in the IC card 1 with a display function of the present embodiment, the standby current from the power source 25 can be omitted when the control unit 21 is not operating, and power is supplied from the power source 25 by turning on the switch 4 during operation. In response to the control of the control unit 21 that receives the power, the electronic switch 27a is turned on and the power supply is ensured even when the switch 4 is turned off. Thereby, it is possible to process the IC card 1 with a display function by the control unit 21 executing a predetermined program while reducing power consumption.
Further, when the control unit 21 is shut down, the electronic switch 27a is turned off and the electronic switch 27b is turned on by the control of the control unit 21, and the control unit 21 is connected to the ground 26. Is quickly reduced to the ground level, and the malfunction of the control unit 21 as described above can be prevented. When the control unit 21 is a microcomputer circuit using a commercially available microcomputer (a microcomputer “S1C17602” manufactured by Seiko Epson Corporation), and the shutdown operation using the method of the present embodiment is examined by a circuit simulator, the control unit 21 is 6 ms after the shutdown. It was confirmed that it was possible to prevent the malfunction near the lowest operating voltage by rapidly dropping the voltage level.

  Further, the electronic switch 27a is a high-side switch, and a small-signal MOS transistor is used as a transistor constituting the electronic switch 27a, and a small-signal MOS transistor is used for the electronic switch 27b. Power consumption can be reduced, and leakage current during non-operation can also be suppressed.

In the present embodiment, an IC card with a display function that performs processing for displaying the data of the IC chip on the display unit is described as an example of the electronic medium. However, various processes are performed in addition to display by execution of the program by the control unit. An IC card with a function may be used.
In addition, examples of the electronic medium include a mobile terminal including a control unit and a storage unit. However, since the IC card with a display function as in this embodiment is generally thin, it is required to provide a switch with a simple configuration such as a push switch. It is particularly effective.

  Furthermore, as a modification of the present embodiment, in addition to the above, for example, the switch transistor 33 may be configured as a low-side switch as the electronic switch 27a. However, when configured as a high-side switch as in the present embodiment, there is an advantage that the leakage current can be made smaller than when the low-side switch is used.

  Further, as the electronic switches 27a and 27b, it is also possible to use conventional transistors or large current compatible MOS transistors. However, since the bias current and the leak current are increased, from the viewpoint of power consumption, it is advantageous to use a small-signal MOS transistor as described with reference to FIG.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these are naturally within the technical scope of the present invention. Understood.

1 ... IC card with display function 2 ......... Card body 3 ......... Display 4 ......... Switch 5 ......... Contact terminal 21 ......... Control unit 23 ......... Display driver 25 ......... Power supply 26, 30 ......... Ground 27a, 27b ......... Electronic switch 28 ......... IC chip 29 ......... Antenna

Claims (8)

  1. Power supply,
    A control unit;
    A push switch that is turned on when pressed and is supplied with power from the power source to the control unit;
    A first electronic switch that is turned on by the control by the control unit to supply power from the power source to the control unit, and that is turned off by the control by the control unit and that cuts off power supply from the power source to the control unit;
    A second electronic switch connected to ground by turning on the controller;
    Comprising
    The push switch and the first electronic switch are connected in parallel between the power source and the control unit,
    When the push switch is turned on, power is supplied from the power source to the control unit, and the control unit is activated,
    The first electronic switch is turned on under the control of the activated control unit,
    An electronic medium, wherein the control unit executes a predetermined program and then shuts down to turn off the first electronic switch and turn on the second electronic switch.
  2.   The first electronic switch is a high-side switch in which power is supplied from the power source to the control unit by turning on the switch transistor when the control input transistor is turned on by the control of the control unit. 2. The electronic medium according to claim 1, wherein a small-signal MOS transistor is used as the control input transistor and the switch transistor.
  3.   3. The electronic medium according to claim 1, wherein the second electronic switch is a switch transistor, and a small-signal MOS transistor is used as the switch transistor.
  4. The electronic medium is an IC card with a display function further comprising an IC chip and a display unit,
    4. The electronic medium according to claim 1, wherein the data stored in the IC chip is displayed on the display unit by executing the predetermined program. 5.
  5. A power supply, a control unit, a push switch that is turned on when pressed and supplied with power from the power supply to the control unit, and turned on by the control of the control unit and supplied with power from the power supply to the control unit A first electronic switch that is turned off by the control of the control unit and that cuts off the power supply from the power source to the control unit; and a second electronic switch that is connected to the ground by being turned on A power supply method in an electronic medium in which the push switch and the first electronic switch are connected in parallel between the power source and the control unit,
    When the push switch is turned on, power is supplied from the power source to the control unit, and the control unit is activated,
    The first electronic switch is turned on under the control of the activated control unit,
    A method of supplying power in an electronic medium, wherein the control unit shuts down after executing a predetermined program, turns off the first electronic switch, and turns on the second electronic switch.
  6.   The first electronic switch is a high-side switch in which power is supplied from the power source to the control unit by turning on the switch transistor when the control input transistor is turned on by the control of the control unit. 6. The power supply method for an electronic medium according to claim 5, wherein a small-signal MOS transistor is used as the control input transistor and the switch transistor.
  7.   7. The power supply method for an electronic medium according to claim 5, wherein the second electronic switch is a switch transistor, and a small-signal MOS transistor is used as the switch transistor.
  8. The electronic medium is an IC card with a display function further comprising an IC chip and a display unit,
    8. The method of supplying power in an electronic medium according to claim 5, wherein the data stored in the IC chip is displayed on the display unit by executing the predetermined program. .
JP2011202848A 2011-09-16 2011-09-16 Electronic medium and power supply method in electronic medium Active JP5765159B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2011202848A JP5765159B2 (en) 2011-09-16 2011-09-16 Electronic medium and power supply method in electronic medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2011202848A JP5765159B2 (en) 2011-09-16 2011-09-16 Electronic medium and power supply method in electronic medium

Publications (2)

Publication Number Publication Date
JP2013065159A true JP2013065159A (en) 2013-04-11
JP5765159B2 JP5765159B2 (en) 2015-08-19

Family

ID=48188599

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2011202848A Active JP5765159B2 (en) 2011-09-16 2011-09-16 Electronic medium and power supply method in electronic medium

Country Status (1)

Country Link
JP (1) JP5765159B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101710590B1 (en) * 2016-03-08 2017-03-08 김승훈 Smart Card Power Supply System to supply safe Power and increase time of Usage

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08308086A (en) * 1995-05-12 1996-11-22 Fuji Electric Co Ltd Power supply apparatus
JPH09121447A (en) * 1995-10-24 1997-05-06 Fujitsu Ltd Discharge circuit
JPH09129833A (en) * 1995-08-29 1997-05-16 Toshiba Corp Semiconductor device
JP2002099886A (en) * 2000-09-22 2002-04-05 Seiko Epson Corp Portable information processor and control method of portable information processor
JP2004248415A (en) * 2003-02-14 2004-09-02 Rohm Co Ltd Switching circuit
JP2006235687A (en) * 2005-02-22 2006-09-07 Seiko Epson Corp Personal digital assistant
JP2008517395A (en) * 2004-10-20 2008-05-22 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Power control circuit with low power consumption
JP2011514581A (en) * 2008-02-06 2011-05-06 ジエマルト・エス・アー Portable product with automatic switch device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08308086A (en) * 1995-05-12 1996-11-22 Fuji Electric Co Ltd Power supply apparatus
JPH09129833A (en) * 1995-08-29 1997-05-16 Toshiba Corp Semiconductor device
JPH09121447A (en) * 1995-10-24 1997-05-06 Fujitsu Ltd Discharge circuit
JP2002099886A (en) * 2000-09-22 2002-04-05 Seiko Epson Corp Portable information processor and control method of portable information processor
JP2004248415A (en) * 2003-02-14 2004-09-02 Rohm Co Ltd Switching circuit
JP2008517395A (en) * 2004-10-20 2008-05-22 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Power control circuit with low power consumption
JP2006235687A (en) * 2005-02-22 2006-09-07 Seiko Epson Corp Personal digital assistant
JP2011514581A (en) * 2008-02-06 2011-05-06 ジエマルト・エス・アー Portable product with automatic switch device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101710590B1 (en) * 2016-03-08 2017-03-08 김승훈 Smart Card Power Supply System to supply safe Power and increase time of Usage

Also Published As

Publication number Publication date
JP5765159B2 (en) 2015-08-19

Similar Documents

Publication Publication Date Title
CA2642468C (en) System and method for manage and control near field communication for a mobile multifunctional device when the device is uncharged or only partially charged
KR100767712B1 (en) Electronic divice and semiconductor integrated circuit and data processing system
JP2007288718A (en) Information processing terminal, ic card, mobile communication apparatus, radio communication method, and program
CN1130830C (en) Integrated circuit device
US7156313B2 (en) IC card with display panel but without batteries
JP4878744B2 (en) Chip card with simultaneous contact and non-contact operation
US6820208B2 (en) IC card, IC chip, data assuring method and power supply monitor method
EP0861468A1 (en) Automatic voltage detection in multiple voltage applications
US5140557A (en) Static random access memory of an energy-saving type
TW200700945A (en) Self-test circuitry to determine minimum operating voltage
JP4515093B2 (en) CPU power-down method and apparatus therefor
TW556211B (en) Semiconductor device
US7076612B2 (en) Cache interface circuit for automatic control of cache bypass modes and associated power savings
TW200406010A (en) Semiconductor device saving data in non-volatile manner during standby
EP0939495A1 (en) Power saving for a electronic devices
KR101053185B1 (en) Smart card and its mixed mode control method
US6072250A (en) Battery pack having a hibernate circuit
WO2000057355A1 (en) Data carrier with a battery and display
JP4455079B2 (en) Power circuit
JP4621113B2 (en) Semiconductor integrated circuit device
WO2008089076A2 (en) Temperature management in an integrated circuit card with electrophoretic display
JP4282865B2 (en) Circuit device for sending supply current
US5058075A (en) Battery circuit for an integrated circuit (IC) memory card
US7789313B2 (en) Fully simultaneous information on variations in status for an object with a dual interface
US20010027032A1 (en) Mode-switchable PC card and PC card input/output control device

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20140718

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20141125

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20141209

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20150209

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20150519

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20150601

R150 Certificate of patent or registration of utility model

Ref document number: 5765159

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150