JPH0460890A - Non-contact memory card - Google Patents
Non-contact memory cardInfo
- Publication number
- JPH0460890A JPH0460890A JP2172337A JP17233790A JPH0460890A JP H0460890 A JPH0460890 A JP H0460890A JP 2172337 A JP2172337 A JP 2172337A JP 17233790 A JP17233790 A JP 17233790A JP H0460890 A JPH0460890 A JP H0460890A
- Authority
- JP
- Japan
- Prior art keywords
- power
- power supply
- circuit
- internal electronic
- electronic circuit
- 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.)
- Pending
Links
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 4
- 239000003990 capacitor Substances 0.000 description 14
- 238000004891 communication Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
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- Credit Cards Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野〕
本発明は、非接触メモリーカー１の電力供給回路に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power supply circuit for a non-contact memory car 1.
従来のコイルで非接触メモリカードヘ一定の電力を供給
する電力供給回路では、カートの電源立ち」二げ時、カ
ード内のコンテンツを充電するだめの時間が例えば１０
ミリｓｅｃ以上かかってしまうことが実験により確かめ
られている。In a conventional power supply circuit that supplies constant power to a contactless memory card using a coil, when the cart is turned on and turned off, it takes, for example, 10 minutes to charge the contents in the card.
It has been confirmed through experiments that it takes more than milliseconds.
これは通常の通信時にカード内電源のリップルを減らず
ためカート内に比較的大型のコンテンツを使用している
ためであるとともに、そのコンデン→ノに並列に接続さ
れている内部電子回路に不要な電流が流れ、結果として
コンデンソの充電に時間がかかってしまうためである。This is because relatively large contents are used in the cart to avoid reducing ripples in the card's internal power supply during normal communication, and the internal electronic circuit connected in parallel to the capacitor has no unnecessary content. This is because current flows, and as a result, it takes time to charge the capacitor.
特に電力供給開始直後は電源電圧も低く、内部電子回路
の動作が不安定で、消費する電流も多くなったりする可
能性がある。In particular, immediately after power supply starts, the power supply voltage is low, the operation of the internal electronic circuitry is unstable, and the current consumption may increase.
このようなシステムを、相対的に移動しながらデータ通
信を行なう用途に応用すると、限られた通信時間の中で
カード電源立ち上げに要する時間の比率が極めて大きく
なってしまう。（大体１０ミリ秒の間に約１０にビット
／秒の通信速度で１０データ、５００にビット／秒では
５００デークの送受信ができる。）すなわち短いデータ
のやり取りの場合その通信時間はほとんどカート電ｄＢ
立ち上げ時間で決まってしまうごとになる。If such a system is applied to an application where data communication is performed while moving relatively, the ratio of the time required to turn on the card power within the limited communication time becomes extremely large. (It is possible to send and receive 10 data at a communication speed of about 10 bits/second, and 500 data at a communication speed of 500 bits/second, in about 10 milliseconds.) In other words, when exchanging short data, the communication time is almost dB
It will be determined by the startup time.
−μｑ
また電源立ち上げ時間を早めるため多量の磁束を常時供
給し続けるとカード内での余剰電力により発熱し信頼性
に悪影響をもたらす。−μq Furthermore, if a large amount of magnetic flux is constantly supplied in order to speed up the power supply start-up time, excess power within the card generates heat, which adversely affects reliability.
本発明は上記欠点を改良しカード側電源の立ち上げを早
くし、相対的に移動しながら通信を行なうときの時間効
率を上げ、かつ無駄な電力を消費せず効率良く電力を供
給するシステムを提供することを目的とする。The present invention improves the above drawbacks and provides a system that speeds up the power supply on the card side, improves time efficiency when communicating while moving relative to each other, and efficiently supplies power without consuming unnecessary power. The purpose is to provide.
上記の目的を達成するために、本発明は次のような構成
としている。即ち、磁気結合により電力供給を受け、該
電力により内部電子回路を動作させる非接触メモリーカ
ードにおいて、電力受信部と該内部電子回路との間に電
源接続回路を設け、該電源接続回路は電力供給開始後、
該内部電子回路が動作可能な電圧になるまで該内部電子
回路と前記電力受信部とを切り離しておくことを特徴と
している。In order to achieve the above object, the present invention has the following configuration. That is, in a contactless memory card that receives power through magnetic coupling and uses the power to operate an internal electronic circuit, a power supply connection circuit is provided between a power receiving section and the internal electronic circuit, and the power supply connection circuit is configured to supply power. After starting,
It is characterized in that the internal electronic circuit and the power receiving section are separated from each other until the internal electronic circuit reaches a voltage at which it can operate.
以下、本発明の実施例を図面に基づいて詳述する。第１
図は、本発明の電力供給回路を取り入れた非接触メモリ
ーカードの回路ブロック線図である。４は電源供給回路
、Ｌｌは電力供給コイルで、リーダライタを構成してお
り、カードに対して電力の供給を行なう。Ｌ２は電力受
信コイル、ＣＩは効率良く電力供給を受けるための並列
共振コンデンサであり、カードの電力受信部である。Ｄ
ｌ、Ｄ２はダイオード、Ｃ２、Ｃ３は大容量の電解コン
デンサであり、受信した電力信号を整流する整流回路を
構成している。以トの電源供給回路４から整流回路まで
を１つの機能ブＩＩツクとし７て、電源部１とみなすも
のとする。整流された電力信号は、電源接続回路３を通
して内部電子回路部２の動作電力として供給される。内
部電子回路部２は、定電圧回路５、および複数の電子回
路Ａ−Ｚで構成されており、電力供給が開始され電源電
圧が所定のレベルに達すると動作を始める。なお、デー
タ通信用のコイルは、本発明の説明を行なうのに必要な
いため、回路図中では省略しである。Hereinafter, embodiments of the present invention will be described in detail based on the drawings. 1st
The figure is a circuit block diagram of a contactless memory card incorporating the power supply circuit of the present invention. 4 is a power supply circuit, and Ll is a power supply coil, which constitutes a reader/writer and supplies power to the card. L2 is a power receiving coil, and CI is a parallel resonant capacitor for efficiently receiving power supply, which is the power receiving section of the card. D
1 and D2 are diodes, and C2 and C3 are large-capacity electrolytic capacitors, which constitute a rectifier circuit that rectifies the received power signal. The following components from the power supply circuit 4 to the rectifier circuit are considered to be one functional block 7, and are considered to be the power supply section 1. The rectified power signal is supplied as operating power to the internal electronic circuit section 2 through the power supply connection circuit 3 . The internal electronic circuit unit 2 includes a constant voltage circuit 5 and a plurality of electronic circuits AZ, and starts operating when power supply is started and the power supply voltage reaches a predetermined level. Note that the coil for data communication is not necessary for explaining the present invention, so it is omitted from the circuit diagram.
電源供給回路４が電力供給コイルＬｌに断続的に電流を
流しパルス駆動を開始すると、交流磁場が発生し、磁束
の変化に応じて電力受信コイルＬ２に起電力が誘起され
、ダイオードＤ１、Ｄ２、および電解コンデンサＣ２、
Ｃ３で構成される整流回路により直流の電力信号に変換
される。ここで、電解コンデンサＣ２、Ｃ３は比較的に
大容量であるため、電力供給開始直後は十分に充電され
ていないので電力信号の電圧レベルは低く、内部電子回
路部２を動作可能にするには至っていない。When the power supply circuit 4 starts pulse driving by intermittently passing current through the power supply coil Ll, an alternating current magnetic field is generated, and an electromotive force is induced in the power reception coil L2 according to the change in magnetic flux, which causes the diodes D1, D2, and electrolytic capacitor C2,
The rectifier circuit composed of C3 converts the signal into a DC power signal. Here, since the electrolytic capacitors C2 and C3 have relatively large capacities, they are not sufficiently charged immediately after power supply starts, so the voltage level of the power signal is low, and it is necessary to make the internal electronic circuit section 2 operational. Not yet reached.
電源接続回路３は電圧検出回路、パワートランジスタ等
から成っており、入力電圧レベルが低い時にはパワート
ランジスタをオフにし、入力信号を出力しないようにし
ておく回路である。即ち、電力供給開始後、電力信号の
電圧が内部電子回路部２を動作可能にするレベルに達す
るまで、電源部１からの電力を内部電子回路部２に供給
しないようにしておくものである。The power supply connection circuit 3 is composed of a voltage detection circuit, a power transistor, etc., and is a circuit that turns off the power transistor when the input voltage level is low so as not to output an input signal. That is, after the start of power supply, power from the power supply section 1 is not supplied to the internal electronic circuit section 2 until the voltage of the power signal reaches a level that enables the internal electronic circuit section 2 to operate.
第３図は、第２図の電源接続回路３の内部回路構成を具
体的に表した回路ブロック線図である。FIG. 3 is a circuit block diagram specifically showing the internal circuit configuration of the power supply connection circuit 3 of FIG. 2. As shown in FIG.
６は電圧検出回路であり、電源電圧が所定の電圧に達す
るまで信号を出力しない（出力はＬ”レベル状態）回路
である。ＴＮＩはｎチャンネルトランジスタで、電圧検
出回路６の出力に接続されており、”１］”レベルの信
号が入力されるとオンとなる。ＴＰＩは大電力を駆動で
きるｐチャンネルパワートランジスタであり、ｎチャン
ネルトランジスタＴＮＩのドレイン側に接続されている
。6 is a voltage detection circuit, which does not output a signal until the power supply voltage reaches a predetermined voltage (the output is in the L" level state). TNI is an n-channel transistor, which is connected to the output of the voltage detection circuit 6. It turns on when a "1" level signal is input.TPI is a p-channel power transistor that can drive large power, and is connected to the drain side of the n-channel transistor TNI.
同時に、抵抗Ｒ１でプルアップされているため、ｎチャ
ンネルトランジスタＴＮＩがオフの時にはオフ状態とな
っている。At the same time, since it is pulled up by the resistor R1, it is in an off state when the n-channel transistor TNI is off.
さて、第１図の電解コンデンサＣ２、Ｃ３が十分に充電
され電力信号の電圧が内部電子回路部２を動作可能にす
るレベルに達すると、前述の電源接続回路３の中の電圧
検出回路６がその電圧レベル検出し、出力信号が”Ｈ”
レベルとなってｎチャンネルトランジスタＴＮＩがオン
となる。すると、ｐチャンネルパワートランジスタＴＰ
Ｉには”Ｌ” レベルの信号が入力されオンとなり内部
電子回路部２に電力が伝わって、動作を開始する。Now, when the electrolytic capacitors C2 and C3 shown in FIG. The voltage level is detected and the output signal is “H”
level, and the n-channel transistor TNI is turned on. Then, the p-channel power transistor TP
An "L" level signal is input to I, which turns it on, transmits power to the internal electronic circuit section 2, and starts operation.
次に、この様子を第２図の等価回路によりわかりやすく
説明する。図中の同番号、同名称は第１図のものと同一
の機能をはたず。電源部１においてＶＯはコイルＬ１．
Ｌ２を介して電力を供給するだめの電源、Ｒ１は内部イ
ンピーダンス、Ｃ４は電解コンデンサＣ２、Ｃ３を表す
。また、内部電子回路部２のＲ２は、定電圧回路５、電
子回路Ａ−Ｚを含めた等価インピーダンスを表す。電源
接続回路３は、条件付きのスイッチとみなす。第１図の
電源部ｌは、交流電力が加えられ整流して直流電力とし
ているが、本発明の要旨をわかりやすくするため、第２
図では直流電源が加えられるものとした。まず、スイッ
チＳ１が閉じて電源■０が加えられると、抵抗Ｒ１を通
してコンデンサＣ４の充電を開始する。この時、電源接
続回路３のスイッチＳ２は開いているものとする。する
と、■１点の電位は一般的によく知られているコンデン
サの充電式
％式％
にしたがって上昇する。こごで、Ｌは経過時間、Ｃはコ
ンデンサＣ４の値、Ｒは抵抗Ｒ１Ｏ値、■は抵抗Ｒ４の
両端電圧であり、時間の経過と共にコンデンサＣ４が充
電されていき、抵抗Ｒ４に流れろ電流が減少して■１の
電位が■０の値に近づいていく事がわかる。このように
■１の電位が上がるにつれ、前述の条件、即ち■１が内
部電子回路部３の動作可能電圧に達した時に、電源接続
回路３のスイッチＳ２が閉し、内部電子回路部３に電源
が加わることになる。Next, this situation will be explained in an easy-to-understand manner using the equivalent circuit shown in FIG. The same numbers and names in the figure have the same functions as those in Figure 1. In the power supply unit 1, VO is connected to the coil L1.
A power source supplies power through L2, R1 represents an internal impedance, and C4 represents electrolytic capacitors C2 and C3. Further, R2 of the internal electronic circuit section 2 represents an equivalent impedance including the constant voltage circuit 5 and the electronic circuits AZ. The power supply connection circuit 3 is considered to be a conditional switch. The power supply section l in FIG. 1 receives AC power and rectifies it to produce DC power.
In the figure, it is assumed that a DC power source is applied. First, when the switch S1 is closed and the power supply (2)0 is applied, charging of the capacitor C4 is started through the resistor R1. At this time, it is assumed that the switch S2 of the power supply connection circuit 3 is open. Then, ■the potential at one point increases according to the generally well-known charging type % formula for capacitors. Here, L is the elapsed time, C is the value of capacitor C4, R is the value of resistor R1O, and ■ is the voltage across resistor R4. As time passes, capacitor C4 is charged, and current flows through resistor R4. It can be seen that the potential of ■1 approaches the value of ■0 as it decreases. As the potential of ■1 increases in this way, when the above-mentioned condition, that is, when ■1 reaches the operable voltage of the internal electronic circuit section 3, the switch S2 of the power supply connection circuit 3 closes, and the internal electronic circuit section 3 Power will be added.
ここで仮に、電源接続回路３のスイッチＳ２がずっと閉
じられた状態にあったとすると、電源■０が加えられて
コンデンサＣ４の充電が開始されると同時に、スイッチ
Ｓ２を通して内部電子回路部２の抵抗Ｒ２にも電流が流
れるため、コンデンサＣ４を充電するのに必要な電流が
減り、充電に時間がかかってしまう。また、電源電圧が
、動作可能に１−分なレベルに達し一ζいないため内部
電子回路部２の動作は不安定で、時として大きな電流が
流れることもある。Assuming that the switch S2 of the power supply connection circuit 3 has been in the closed state for a long time, the power supply ■0 is applied and charging of the capacitor C4 is started, and at the same time, the resistance of the internal electronic circuit section 2 is passed through the switch S2. Since current also flows through R2, the current required to charge capacitor C4 decreases, and charging takes time. Further, since the power supply voltage has not yet reached a level of 1-min to enable operation, the operation of the internal electronic circuit section 2 is unstable, and a large current may sometimes flow.
以上のように本発明によれば、電源部と内部電子回路部
との間に電源接続回路を設け、電力の供給が開始されて
から電源電圧が一定のレベルに達するまで内部電子回路
部に電源部からの電力を加えないようにし、無駄な電力
を消費しないようにすることで電源の立ち上げ時間を速
くし、相対的に移動しながら通信を行なうようなシステ
ムでの時間効率を」二げ、かつ無駄な電力を消費しない
システムを構築するのに効果がある。As described above, according to the present invention, a power supply connection circuit is provided between the power supply section and the internal electronic circuit section, and the internal electronic circuit section is supplied with power until the power supply voltage reaches a certain level after the supply of power is started. This speeds up the power supply start-up time by not adding power from other parts and consuming unnecessary power, thereby increasing time efficiency in systems that communicate while moving relative to each other. , and is effective in building a system that does not consume unnecessary power.
第１図は、本発明の電力供給回路を取り入れた非接触メ
モリーカードの回路ブロンク線図、第２図は、本発明の
電力供給回路をわかりやすく説明するための第１図の等
価回路、第３図は、第１図の電源接続回路の構成を具体
的に表す回路ブロンク線図である。
１・・・電源部、
２・・・内部電子回路、
３・・・電源接続回路、FIG. 1 is a circuit diagram of a non-contact memory card incorporating the power supply circuit of the present invention, and FIG. 2 is an equivalent circuit diagram of FIG. 1 for easily explaining the power supply circuit of the present invention. FIG. 3 is a circuit diagram specifically showing the configuration of the power supply connection circuit of FIG. 1. 1... Power supply section, 2... Internal electronic circuit, 3... Power supply connection circuit,
Claims (1)
回路を動作させる非接触メモリーカードにおいて、電力
受信部と該内部電子回路との間に電源接続回路を設け、
該電源接続回路は電力供給開始後、該内部電子回路が動
作可能な電圧になるまで該内部電子回路と前記電力受信
部とを切り離しておくことを特徴とする非接触メモリー
カード。In a contactless memory card that receives power through magnetic coupling and operates an internal electronic circuit with the power, a power supply connection circuit is provided between a power receiving section and the internal electronic circuit,
A non-contact memory card, wherein the power supply connection circuit disconnects the internal electronic circuit from the power receiving unit after power supply starts until a voltage at which the internal electronic circuit can operate is reached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2172337A JPH0460890A (en) | 1990-06-29 | 1990-06-29 | Non-contact memory card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2172337A JPH0460890A (en) | 1990-06-29 | 1990-06-29 | Non-contact memory card |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0460890A true JPH0460890A (en) | 1992-02-26 |
Family
ID=15940035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2172337A Pending JPH0460890A (en) | 1990-06-29 | 1990-06-29 | Non-contact memory card |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0460890A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5418358A (en) * | 1992-08-20 | 1995-05-23 | Temic Telefunken Microelectronic Gmbh | Chip card with field strength detector having a switch and load to limit damping to the measurement cycle |
| JP2003132316A (en) * | 2001-10-29 | 2003-05-09 | Fujitsu Ltd | Information processor and card type information processing device |
| JP2009100276A (en) * | 2007-10-17 | 2009-05-07 | Aruze Corp | Wireless communication tag and wireless communication system |
-
1990
- 1990-06-29 JP JP2172337A patent/JPH0460890A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5418358A (en) * | 1992-08-20 | 1995-05-23 | Temic Telefunken Microelectronic Gmbh | Chip card with field strength detector having a switch and load to limit damping to the measurement cycle |
| JP2003132316A (en) * | 2001-10-29 | 2003-05-09 | Fujitsu Ltd | Information processor and card type information processing device |
| JP2009100276A (en) * | 2007-10-17 | 2009-05-07 | Aruze Corp | Wireless communication tag and wireless communication system |
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