JPS63242593A - Ic card - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an IC card, and particularly to an IC card with a built-in power supply.

(Prior art) In recent years, ICs with built-in microprocessors and memory have become popular.
Cards are becoming popular. Figure 2 shows a conventional general IC.
Shows the configuration of the card. This IC-shaped card consists of an IC card body 1 on a plate 1, an arithmetic unit 2 and a memory table W13 embedded therein, and contact electrodes 4 exposed on the surface of the card body 1. The components indicated by broken lines are the components built into the card body 1.

Arithmetic device 2. Although the memory device 3 and the contact electrode 4 are wired to each other, these # lines are omitted in FIG. 2. FIG. 3 is a sectional view of the IC card shown in FIG. 2. The card body 1 is composed of a core part 5 and a sheet part 6 made of plastic. A computing device 2 is embedded in the core section 5 . The storage device 3 is similarly embedded in the core section 5. Wiring layer 7 is this core 8I! 5 is provided on the upper surface of the arithmetic device 2.5 as described above. Memory device 3 and contact electrode 4 are interconnected. The sheet portions 6 are provided on both sides of the card body 1 and function as a protective layer. This IC card has a function of exchanging information by being inserted into a reader/writer device.

In this case, the contact electrode 4 exposed on the first surface is contacted by the electrode of the reader/reader device 5, from which power is supplied and at the same time data output and power are performed.

Note that the contact electrode 4 usually has six terminals, each of which is as follows.

(1) Vcc (circuit voltage) (2) R8T (reset signal) (3) CLK (clock signal)' (4) GND (zero voltage) (5) VPP (program supply voltage) (6) Ilo (data input) As shown in Figure 2, conventional IC cards do not have a built-in power supply and operate by receiving power from the reader/writer device.
ine) action). For this reason, the IC card cannot operate on its own, and operations such as calculations and data display are performed using the IC card alone.
The disadvantage was that it was not possible to do so (called ne).

So, I! on the IC card! The above drawbacks are solved by incorporating an ultra-thin battery as a power source, but when a primary battery is used as a built-in power source, the circuit configuration is as shown in FIG. 4.

Inside the 1G power supply main body 1 are an integrated circuit bag [8, a primary battery 9 and an i! A power source switching circuit W110 is embedded, and an external power source 13 is connected to a YCC (circuit voltage) terminal 11 and a GND (zero voltage) terminal 12 of the contact electrodes 4 exposed on the surface of the card body 1. Contact 11i4 and integrated circuit bag '1
Wiring is provided between the terminal and the terminal 18. Regarding the power supply path, the Vcc terminal 11 of the contact electrode 4 and the primary battery 9 are connected to 11
connected to the input terminal 14.15 of the source switching circuit device 10;
Its output terminal 16 is connected to the integrated circuit device 8 .

Further, the GND terminal 12 of the contact electrode 4 is connected to the primary battery 9 and the integrated circuit bag W18. The power supply switching circuit bag [10 is configured to output the input from the external power supply 13 during on 1ine operation, and output the input from the primary battery 9 during OFF 1ine operation. An example of the circuit configuration of this power supply switching circuit device 110 is shown in FIG. This is P-
In one example using a MOS transistor, the external power supply voltage V
CC and internal i! The source voltage BAT is the input terminal (source terminal Vc) of the external power supply side transistor 17 and the internal power supply side transistor 18 14. 0LJT is added to each input terminal (VBA terminal) 15, and output terminal (drain side terminal? Shadaishi) 16
are output in common, and detection signals at the time of On 1ine and Off 1ine are applied to gate terminals 19 and 20 of external and internal power supply side transistors 17 and 18, respectively. On 1i
When ne, external power supply side transistor 17 is on (ON)
L, the internal power supply side transistor 18 is turned off and the external power supply voltage Vcc is output to the output terminal 16 of
Conversely, when the line is fline, the internal power supply voltage VBAT is output.

By the way, the following problems exist in IC cards using this secondary battery as a built-in power supply.

(1) When the IC card is inserted into the reader/writer device
When receiving power supply from the outside of the C card via the contact electrode 4, a power supply switching circuit @ direct 10 is required to switch the power supply to the integrated circuit bag W18 from the primary battery 9 to the external power supply 11113.

(2) When the above power supply switching circuit gA 10 is inserted between the power supply and the integrated circuit device 8, a voltage drop occurs due to the resistance of the power supply switching circuit device 10 itself, and malfunction occurs due to fluctuations in the voltage supplied to the integrated circuit bag M8. This may lead to an increase in power consumption.

(3) When realizing the above power supply switching circuit device 10 using a MOS transistor, it is necessary to widen the transistor gate width in order to reduce the ON resistance of the MOS transistor, which increases the chip cost due to an increase in the IC chip area. .

(4) - Once the battery 9 is exhausted, it cannot be recharged, and it is difficult to replace the battery especially if it is embedded in the IC card, and the IC card body 1 must be replaced, which is not economical. No, no.

(Problems to be Solved by the Invention) The present invention has been made in view of the fact that the prior art uses a problematic primary battery as a built-in battery, and by using a rechargeable secondary battery.

The purpose of the present invention is to provide an economical IC card with a built-in power supply that is less likely to malfunction.

[Structure of the Invention] (Means and Effects for Solving the Problems) In order to achieve the above object, the present invention provides an integrated circuit device provided in a card body and a method for supplying power to the integrated circuit device. and a power supply device comprising a rechargeable secondary battery built into the card body, thereby realizing an economical IC card with a built-in power supply that is less likely to malfunction.

(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic diagram of an embodiment of an IC card according to the present invention. That is, an integrated circuit device 8 is embedded in the card body 1, and a wiring ( Only the power supply path is shown). Furthermore, a secondary battery 21 is connected to the card body 1 as a built-in power source.
This secondary battery 21 is buried within the VCC terminal 11.
, GND terminal 12 and integrated circuit device! Connected to 8. The Vcc terminal 11 and the GND terminal 12 are connected to an external power supply 13.

The battery 21 supplies power to the integrated circuit device ff18 and enters the discharge state, but when the IC card is inserted into the reader/writer device and the external power supply #113 is connected (0nline), the integrated circuit device 8 is supplied with power from the external power supply 13. At the same time, the secondary battery 21 is charged by the external power supply 1113 and enters a charged state. With such a configuration, an economical IC card with a built-in power supply that is less likely to malfunction can be realized.

[Effects of the Invention] As described above, according to the present invention, by using a secondary battery as a battery built into an IC card,
-Compared to the case of using secondary batteries, a power switching circuit device is not required when inserting into an IC card/writer device and supplying power from outside the IC card, so it can be inserted between the power source and the integrated circuit device. Since there is no resistor, there are fewer malfunctions due to fluctuations in supply voltage, and the power consumption is also reduced. In addition, there is no power supply switching circuit device that requires a relatively large chip size, so
Since it can be made smaller, it leads to a reduction in chip cost. Furthermore, I embedded the second battery as an electric AT device.
For C card, 1! Once the battery is exhausted, it is difficult to replace the battery, so the IC card itself must be replaced.
Secondary batteries are rechargeable, can compensate for battery consumption, have a long life, and are economical. By using a secondary battery as a power supply device in this way, it is possible to realize an economical IC card with a built-in power supply that is less likely to malfunction.

[Brief explanation of drawings]

FIG. 1 is a configuration explanatory diagram showing one embodiment of the present invention. Figure 2 is a perspective view of a conventional IC card, and Figure 3 is a perspective view of a conventional IC card.
FIG. 4 is a configuration explanatory diagram showing the connection of a conventional IC card, and FIG. 5 is a circuit diagram showing a conventional power supply switching circuit device. 1...Card body, 4...Contact electric bridge, 8...Integrated circuit 4! Position, 11...■CC terminal, 12...GND
terminal. 13...External'! ! i source, 21... secondary battery. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 Itchy Figure 5

Claims (1)

[Claims] An IC characterized by comprising an integrated circuit device provided within a card body, and a power supply device comprising a rechargeable secondary battery built into the card body for supplying power to the integrated circuit device. card.