JPH0261711A - Power supply circuit and ic card using the same - Google Patents
Power supply circuit and ic card using the sameInfo
- Publication number
- JPH0261711A JPH0261711A JP63213942A JP21394288A JPH0261711A JP H0261711 A JPH0261711 A JP H0261711A JP 63213942 A JP63213942 A JP 63213942A JP 21394288 A JP21394288 A JP 21394288A JP H0261711 A JPH0261711 A JP H0261711A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- secondary battery
- switching circuit
- power supply
- primary battery
- 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
- 230000004888 barrier function Effects 0.000 claims description 2
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- YZSKZXUDGLALTQ-UHFFFAOYSA-N [Li][C] Chemical compound [Li][C] YZSKZXUDGLALTQ-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 244000144985 peep Species 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Landscapes
- Stand-By Power Supply Arrangements (AREA)
- Power Sources (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明はメモリーカード等の電池を使用する小型機器に
使用することができる電源回路およびその回路を用いた
ＩＣカードに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a power supply circuit that can be used in small devices using batteries, such as memory cards, and an IC card using the circuit.
従来の技術
近年、ＩＣカード端末やメモリーカード等の電池を使用
する小型携帯型情報機器の開発が盛んとなってきている
。このような電池駆動の機器の電池寿命を長くするには
、１次電池と共に充電可能な２次電池を用いることが有
効であるが、例えばそのような電源回路としては特開昭
６１−１６０１８１５号公報に示されているものがある
。2. Description of the Related Art In recent years, there has been an active development of small portable information devices such as IC card terminals and memory cards that use batteries. In order to extend the battery life of such battery-powered equipment, it is effective to use a rechargeable secondary battery together with a primary battery. There are some listed in the official gazette.
以下、図面を参照しながら従来の電源回路について説明
する。第３図は従来の電源回路の回路図である。１は１
次電池で、例えばコイン型のリチウム電池等が用いられ
る。２は充′底可能な２次電池で、例えばコイン型のカ
ーボンリチウム電池や電気二重層コンデンサ等が用いら
れる。３ａ、３ｂは第１．第２のスイッチング回路で、
それぞれ１次電池１．２次電池２に接続され、最適な電
池を選択する。４は切り替え回路で、外部電源端子６よ
り供給される外部電源と、１次に池１．２次電池２より
供給される内部電源とを切り替えるだめのものである。A conventional power supply circuit will be described below with reference to the drawings. FIG. 3 is a circuit diagram of a conventional power supply circuit. 1 is 1
For example, a coin-shaped lithium battery is used as a secondary battery. 2 is a rechargeable secondary battery, such as a coin-shaped carbon lithium battery or an electric double layer capacitor. 3a and 3b are the first. In the second switching circuit,
Each is connected to a primary battery 1 and a secondary battery 2, and the most suitable battery is selected. Reference numeral 4 denotes a switching circuit for switching between an external power supply supplied from an external power supply terminal 6 and an internal power supply supplied from a primary battery 1 and a secondary battery 2.
６は充電回路、７は負荷である。6 is a charging circuit, and 7 is a load.
以上のように構成された従来の電源回路について、その
動作を以下に説明する。外部電源端子６に外部電源を接
続したときは、負荷７に切り替え回路４を通して電圧が
供給される。１だ、充電回路６により２次電池２が充電
される。外部電源をオフにしたときは、１次電池１′ま
たは２次電池２からバックアップ用の電圧が負荷７に供
給されるが、このときのバックアップ用の電圧は１次電
池１の出力電圧と２次電池２の出力電圧のうち高い方の
電圧となるように第１．第２のスイッチング回路３ａ、
３ｂで選択される。The operation of the conventional power supply circuit configured as described above will be described below. When an external power supply is connected to the external power supply terminal 6, voltage is supplied to the load 7 through the switching circuit 4. 1, the secondary battery 2 is charged by the charging circuit 6. When the external power supply is turned off, a backup voltage is supplied from the primary battery 1' or the secondary battery 2 to the load 7, but the backup voltage at this time is equal to the output voltage of the primary battery 1 and 2. The first. second switching circuit 3a,
Selected in 3b.
発明が解決しようとする課題
しかしながら上記のような構成においては、第１、第２
のスイッチング回路３ａ 、３ｂを構成しているダイオ
ードに同じスレッショルド電圧のものを用いているので
、１次電池１と２次電池２の出力電圧が同じであった場
合、外部電源をオフにした瞬間から、１次電池１．２次
電池２から同時に放電が始まり、１次電池１が消耗する
という課題があった。特開昭６１−１６０１８６公報に
は上記課題を解決するために１次電池１の出力端にオペ
アンプまたは抵抗器を接続することにより、その電圧降
下を利用して１次電池１よジの出力電圧を２次電池２よ
りも小さくし、２次電池２の方を先に放電させて１次電
池１の寿命を長くするという方法が述べられているが、
この方法では、１次電池１の電圧を電圧降下により小さ
くするために、１次電池１の電池容量のすべて有効に使
用できず、結果、機器の電池寿命が短くなってしまうと
いう課題を有していた。Problem to be Solved by the Invention However, in the above configuration, the first and second
The switching circuits 3a and 3b use diodes with the same threshold voltage, so if the output voltages of primary battery 1 and secondary battery 2 are the same, the moment the external power supply is turned off, Therefore, there was a problem that discharge started from the primary battery 1 and the secondary battery 2 at the same time, causing the primary battery 1 to become exhausted. In order to solve the above problem, JP-A-61-160186 discloses that by connecting an operational amplifier or a resistor to the output terminal of the primary battery 1, the output voltage of the primary battery 1 can be adjusted by utilizing the voltage drop. A method has been described in which the battery is made smaller than the secondary battery 2 and the secondary battery 2 is discharged first to extend the life of the primary battery 1.
This method has the problem that since the voltage of the primary battery 1 is reduced due to a voltage drop, all of the battery capacity of the primary battery 1 cannot be used effectively, resulting in a shortened battery life of the device. was.
本発明は上記課題に鑑み、１次電池と２次電池の出力電
圧が同じでも、２次電池の方を速く放電させ、１次電池
の消耗を少なくすることができる電源回路を提供するも
のである。In view of the above problems, the present invention provides a power supply circuit that can discharge the secondary battery faster and reduce consumption of the primary battery even if the output voltages of the primary battery and the secondary battery are the same. be.
課題を解決するための手段
上記課題を解決するために、本発明の電源回路は、１次
電池と、２次電池と、１次電池と２次電池のそれぞれに
接続された第１．第２のスイッチング回路と、機器使用
中に外部電源より２次電池に充電する回路とを備え、２
次電池に接続された第２のスイッチング回路の電流の流
れ始めるスレッショルド電圧を、１次電池に接続された
第２のスイッチング回路のスレッショルド電圧よりも小
さくしたものである。Means for Solving the Problems In order to solve the above problems, the power supply circuit of the present invention includes a primary battery, a secondary battery, and a primary battery connected to each of the primary battery and the secondary battery. It is equipped with a second switching circuit and a circuit for charging the secondary battery from an external power source while the device is in use.
The threshold voltage at which current begins to flow in the second switching circuit connected to the secondary battery is set lower than the threshold voltage of the second switching circuit connected to the primary battery.
作用
本発明は、上記した構成によって１次電池と２次電池の
出力電圧が同じでも、２次電池に接続された第２のスイ
ッチング回路のスレッショルド電圧の方が１次電池のも
のよりも小さいため、まず２次電池より先に放電し、１
次電池と２次電池のスイッチング回路の出力端の電圧が
等しくなったところで１次電池よりの放電が始まるもの
である。Effect of the present invention is that even if the output voltages of the primary battery and the secondary battery are the same due to the above-described configuration, the threshold voltage of the second switching circuit connected to the secondary battery is lower than that of the primary battery. , the secondary battery is discharged first, and 1
Discharging from the primary battery begins when the voltages at the output terminals of the switching circuits of the secondary battery and the secondary battery become equal.
実施例
以下、本発明の実施例について図面を参照しながら説明
する。EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings.
第１図は、本発明の一実施例にがかる電源回路の回路図
全示すものである。従来例を示す第３因と対応する部分
には同じ番号がつけである。１は１次電池、２は充電可
能な２次電池で、本実施例ではそれぞれコイン型のリチ
ウム電池と、コイン型のカーボンリチウム電池を用いて
いる。１次電池１．２次電池２ともに電池電圧は３ｖで
ある。FIG. 1 shows a complete circuit diagram of a power supply circuit according to an embodiment of the present invention. Parts corresponding to the third factor showing the conventional example are given the same numbers. 1 is a primary battery, and 2 is a rechargeable secondary battery. In this embodiment, a coin-shaped lithium battery and a coin-shaped carbon lithium battery are used, respectively. The battery voltage of both the primary battery 1 and the secondary battery 2 is 3V.
本実施例では上記電池を用いたが、本発明は上記電池に
限定されるものではなく、１次電池１の起電力が２次電
池２の充電時の電圧と等しいが、小さいものであればな
んでもよい。３１ａは１次電池１に接続された第１のス
イッチング回路、３１ｂは２次電池に接続された第２の
スイッチング回路である。第２図に第１．第２のスイッ
チング回路３１ａ、３１ｂの電流電圧特性を示す。第２
図に示すよう釦、電流の流れ出すスレッショルド電圧は
第２のスイッチング回路３１ｔ）の方が第１のスイッチ
ング回路３１＆よりも小さく設定されている。本実施例
では、第１のスイッチング回路３１！ＬとしてＰＮ接合
ダイオードを、第２のスイッチング回路３１ｂとしてシ
ョソトキーパリアダイオードを用いている。スレッショ
ルド電圧はＰＮ接合ダイオードが約ｏ、ａｙ、ショット
キーバリヤダイオードが約０．２ｖである。４は切り替
え回路で、外部電源端子６より供給される外部電源と、
１？：に電池１．２次電池２より供給される内部電源と
を切り替えるためのものである。切り替え回路４には負
荷により大きな電流が流れることもあるため比較的大き
な順方向電流を流すことができるｐｘ接合ダイオードを
用いた。６は充電回路、７は負荷である。Although the above-mentioned battery was used in this embodiment, the present invention is not limited to the above-mentioned battery. Anything is fine. 31a is a first switching circuit connected to the primary battery 1, and 31b is a second switching circuit connected to the secondary battery. Figure 2 shows 1. The current-voltage characteristics of the second switching circuits 31a and 31b are shown. Second
As shown in the figure, the threshold voltage at which current starts flowing is set smaller in the second switching circuit 31t) than in the first switching circuit 31&. In this embodiment, the first switching circuit 31! A PN junction diode is used as L, and a Shosoto key parrier diode is used as the second switching circuit 31b. The threshold voltage is approximately o,ay for a PN junction diode and approximately 0.2v for a Schottky barrier diode. 4 is a switching circuit which connects an external power supply supplied from an external power supply terminal 6;
1? : is used to switch between the battery 1 and the internal power supplied from the secondary battery 2. Since a large current may flow depending on the load, a px junction diode that can flow a relatively large forward current is used in the switching circuit 4. 6 is a charging circuit, and 7 is a load.
以上のように構成され定本実施例の電源回路について、
その動作を以下に説明する。外部電源端子５に外部電源
電圧５’ｉｆ印加したときは、切り替え回路４がオンと
なり負荷７に外部電源電圧が供給される。また、充電回
路６により２次電池２の両端には３ｖの電圧が供給され
、２次電池２が充電される。外部電源をオフにしたとき
は、切り替え回路４がオフとなり内部電池からバックア
ップ用の電圧が負荷７に供給される。この際、第１のス
イッチング回路３１１Ｌのスレッショルド電圧ｉｔ ｏ
、ｓ Ｖ 、 第２のスイッチング回路３１ｂのスレッ
ショルド電圧は０，２Ｖ、１次電池１．２矢′覗池２の
出力電圧は共に３ｖであるので、第２のスイッチング回
路３１ｂがオン、３１＆がオフとなる。Regarding the power supply circuit of this embodiment configured as described above,
Its operation will be explained below. When the external power supply voltage 5'if is applied to the external power supply terminal 5, the switching circuit 4 is turned on and the external power supply voltage is supplied to the load 7. Further, a voltage of 3V is supplied to both ends of the secondary battery 2 by the charging circuit 6, and the secondary battery 2 is charged. When the external power source is turned off, the switching circuit 4 is turned off and backup voltage is supplied to the load 7 from the internal battery. At this time, the threshold voltage it o of the first switching circuit 311L
, s V , the threshold voltage of the second switching circuit 31b is 0.2V, and the output voltage of the primary battery 1.2' peep pond 2 is both 3V, so the second switching circuit 31b is on and 31& is on. It turns off.
すなわち、２次電池２より負荷７にバックアップ電圧が
供給される。その後、２次電池２の電池容量の減少にと
もない、２次電池２の出力電圧が低下していき、２次電
池２の出力電圧が２．６ｖになったところで、スイッチ
ング回路３１１Ｌもオンとなり、以後、１次電池１と２
次電池２の両方からバックアップ電圧が負荷子に供給さ
れる。That is, the backup voltage is supplied from the secondary battery 2 to the load 7 . After that, as the battery capacity of the secondary battery 2 decreases, the output voltage of the secondary battery 2 decreases, and when the output voltage of the secondary battery 2 reaches 2.6V, the switching circuit 311L is also turned on. From now on, primary batteries 1 and 2
Backup voltage is supplied from both of the secondary batteries 2 to the load element.
以上のように本実施例によれば、２次電池２に接続され
た第２のスイッチング回路３１ｂのスレッショルド電圧
を、１次電池１に接続された第１のスイッチング回路３
１ａよりも小さくしたことにより、２次電池２の方が１
次電池１よりも先に放電するので、１次電池１の消耗全
抑え、機器の電池寿命？長くすることができる。As described above, according to this embodiment, the threshold voltage of the second switching circuit 31b connected to the secondary battery 2 is set to the threshold voltage of the first switching circuit 3 connected to the primary battery 1.
By making it smaller than 1a, secondary battery 2 is smaller than 1a.
Since it discharges before the secondary battery 1, it completely reduces the consumption of the primary battery 1 and extends the battery life of the device. It can be made longer.
次に、上記実施例の負荷７として周辺０ＭＯ８型のスタ
ティックラムを用いた場合について説明する。本素子で
は、一般にデータ読みだし、書き込み時の電源電圧は５
ｖ、メモリ内容を保持する几めに最低必要な待機時のバ
ックアンプ電圧としては２Ｖ以上が必要となる。また、
待機時の消費電流は２μ人である。上記実施例の２次電
池２として電池容量０．３８ ｍＡｈのカーボンリチウ
ム電池を用いた時、１次電池１より放電が始まったのは
、外部電源をオフにしてから７６時間後であった。Next, a case will be described in which a peripheral 0 MO8 type static ram is used as the load 7 in the above embodiment. In this device, the power supply voltage for reading and writing data is generally 5
v. 2V or more is required as the minimum back amplifier voltage during standby to retain the memory contents. Also,
Current consumption during standby is 2μ. When a carbon lithium battery with a battery capacity of 0.38 mAh was used as the secondary battery 2 in the above example, discharge from the primary battery 1 started 76 hours after the external power source was turned off.
すなわち、周囲温度を考慮しても、２日に一度外部機器
に接続して使用してやれば、１次電池１の電池容量はほ
とんど減らず、はぼ永久的にメモリー内容は保持される
。すなわち、本発明の電源回路と揮発性メモリＩＣとで
ＩＣカードを構成すると、電池によるメモリ内容保持時
間全従来よりも大幅に長くすることができる。That is, even considering the ambient temperature, if the primary battery 1 is connected to an external device and used once every two days, the battery capacity of the primary battery 1 will hardly decrease, and the memory contents will be retained almost permanently. That is, when an IC card is configured with the power supply circuit of the present invention and a volatile memory IC, the memory content retention time using a battery can be made significantly longer than in the conventional case.
なお、上記実施例ではスイッチング回路３１１Ｌ。Note that in the above embodiment, the switching circuit 311L.
３１ｔ）’ｉダイオードとしたがスイッチング回路はダ
イオードに限定されるものではなく、あるスレッショル
ド電圧で電流のオン、オフ全制御できるという機能を有
するものであればなんでもよい。31t) 'i Although the diode is used, the switching circuit is not limited to a diode, and any switching circuit may be used as long as it has the function of fully controlling the on/off of current at a certain threshold voltage.
例えばトランジスタやサイリスタ、また、それらの複合
回路などを用いることが出来る。For example, a transistor, a thyristor, or a composite circuit thereof can be used.
発明の効果
以上の説明から明らかなように、本発明は１次電池と２
次電池と、１次電池および２次電池のそれぞれに接続さ
れた第１．第２のスイッチング回路と、機器使用中に２
次電池に充電するための回路を備え、２次電池に接続さ
れた第２のスイッチング回路のスレッショルド電圧を、
１次電池に接続された第１のスイッチング回路のスレッ
ショルド電圧よりも小さいように構成しているので、１
次電池と２次電池の′電池電圧が同じ場合でも２次電池
の方を１次電池よりも速く放電させることができる。そ
のため、機器の電池寿命を長くできるという効果が得ら
れる。Effects of the Invention As is clear from the above explanation, the present invention has a primary battery and a secondary battery.
a secondary battery, and a first battery connected to each of the primary battery and secondary battery. The second switching circuit and the
The threshold voltage of the second switching circuit, which includes a circuit for charging the secondary battery and is connected to the secondary battery, is
Since it is configured to be lower than the threshold voltage of the first switching circuit connected to the primary battery, 1
Even if the secondary battery and the secondary battery have the same battery voltage, the secondary battery can be discharged faster than the primary battery. Therefore, the effect of lengthening the battery life of the device can be obtained.
また、本発明の電源回路と揮発性メモリエＣより構成さ
れたＩＣカードは従来のものよりもメモリ内容保持時間
全大幅に長くすることができる。Furthermore, an IC card constructed from a power supply circuit and a volatile memory card according to the present invention can have a much longer total memory content retention time than conventional IC cards.
第１図は本発明の一実施例にかかる電源回路の回路図、
第２図はスイッチング回路の電流電圧特性図、第３図は
従来の電源回路の回路図である。
１・・・・・・１次電池、２・・・・・・２次電池、３
１ａ・・・・・・１次電池に接続された第１のスイッチ
ング回路、３１ｂ・・・・・・２次電池に接続された第
２のスイッチング回路、４・・・・・・切り替え回路、
５・・・・・・外部電源端子、６・・・・・・充電回路
、７・・・・・・負荷。
代理人の氏名 弁理士 粟 野 重 孝 ほか１基筒
図
θ、ｚＶ
０．６Ｖ
勉ＬFIG. 1 is a circuit diagram of a power supply circuit according to an embodiment of the present invention;
FIG. 2 is a current-voltage characteristic diagram of a switching circuit, and FIG. 3 is a circuit diagram of a conventional power supply circuit. 1...Primary battery, 2...Secondary battery, 3
1a...First switching circuit connected to the primary battery, 31b...Second switching circuit connected to the secondary battery, 4...Switching circuit,
5...External power supply terminal, 6...Charging circuit, 7...Load. Name of agent: Patent attorney Shigetaka Awano and 1 other cylinder figure θ, zV 0.6V Tsutomu L
Claims (3)
２次電池のそれぞれに接続された第１，第２のスイッチ
ング回路と、機器使用中に前記２次電池に外部電源より
充電するための回路とを備え、前記２次電池に接続され
た第２のスイッチング回路の電流の流れ始めるスレッシ
ョルド電圧を、前記１次電池に接続された第１のスイッ
チング回路のスレッショルド電圧よりも小さくした電源
回路。(1) A primary battery, a secondary battery, first and second switching circuits connected to each of the primary battery and the secondary battery, and an external power supply to the secondary battery while the device is in use. a charging circuit, the threshold voltage at which current begins to flow in the second switching circuit connected to the secondary battery is set to be lower than the threshold voltage of the first switching circuit connected to the primary battery. power supply circuit.
スイッチング回路が、それぞれＰＮ接合ダイオード、シ
ョットキーバリヤダイオードである請求項１記載の電源
回路。(2) The power supply circuit according to claim 1, wherein the first and second switching circuits connected to the primary battery and the secondary battery are respectively PN junction diodes and Schottky barrier diodes.
モリＩＣとを備えたＩＣカード。(3) An IC card comprising the power supply circuit according to claim 1 or 2 and a volatile memory IC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63213942A JPH0261711A (en) | 1988-08-29 | 1988-08-29 | Power supply circuit and ic card using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63213942A JPH0261711A (en) | 1988-08-29 | 1988-08-29 | Power supply circuit and ic card using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0261711A true JPH0261711A (en) | 1990-03-01 |
Family
ID=16647599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63213942A Pending JPH0261711A (en) | 1988-08-29 | 1988-08-29 | Power supply circuit and ic card using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0261711A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6116411A (en) * | 1996-03-06 | 2000-09-12 | Phoenix Aktiengesellschaft | Conveyor belt |
| FR2837583A1 (en) * | 2002-03-19 | 2003-09-26 | Schneider Automation | Supply system for preserving data on a mobile electronic card, comprises first and second integral batteries with means to switch in either as required when the main supply is absent |
| US20140059360A1 (en) * | 2012-08-23 | 2014-02-27 | Lifescan Scotland Limited | Power supplies management in an analyte device having primary and secondary batteries |
| EP2790292A1 (en) * | 2012-05-10 | 2014-10-15 | Huawei Technologies Co., Ltd | Temporary back-up power system and temporary back-up power method |
| US9652921B2 (en) | 2015-06-16 | 2017-05-16 | J.J. Mackay Canada Limited | Coin chute with anti-fishing assembly |
| US9842455B2 (en) | 2011-03-03 | 2017-12-12 | J.J. Mackay Canada Limited | Single space parking meter and removable single space parking meter mechanism |
| US10141629B2 (en) | 2008-12-23 | 2018-11-27 | J.J. Mackay Canada Limited | Single space wireless parking with improved antenna placements |
| USD863075S1 (en) | 2015-10-16 | 2019-10-15 | J.J. Mackay Canada Limited | Parking meter |
| US11762479B2 (en) | 2019-01-30 | 2023-09-19 | J.J. Mackay Canada Limited | SPI keyboard module for a parking meter and a parking meter having an SPI keyboard module |
| US11922756B2 (en) | 2019-01-30 | 2024-03-05 | J.J. Mackay Canada Limited | Parking meter having touchscreen display |
| US11972654B2 (en) | 2015-08-11 | 2024-04-30 | J.J. Mackay Canada Limited | Lightweight vandal resistant parking meter |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6377335A (en) * | 1986-09-19 | 1988-04-07 | フアナツク株式会社 | Backup source |
-
1988
- 1988-08-29 JP JP63213942A patent/JPH0261711A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6377335A (en) * | 1986-09-19 | 1988-04-07 | フアナツク株式会社 | Backup source |
Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6116411A (en) * | 1996-03-06 | 2000-09-12 | Phoenix Aktiengesellschaft | Conveyor belt |
| FR2837583A1 (en) * | 2002-03-19 | 2003-09-26 | Schneider Automation | Supply system for preserving data on a mobile electronic card, comprises first and second integral batteries with means to switch in either as required when the main supply is absent |
| US11670835B2 (en) | 2008-12-23 | 2023-06-06 | J.J Mackay Canada Limited | Single space wireless parking with improved antenna placements |
| US10998612B2 (en) | 2008-12-23 | 2021-05-04 | J.J. Mackay Canada Limited | Single space wireless parking with improved antenna placements |
| US10573953B2 (en) | 2008-12-23 | 2020-02-25 | J.J. Mackay Canada Limited | Single space wireless parking with improved antenna placements |
| US10141629B2 (en) | 2008-12-23 | 2018-11-27 | J.J. Mackay Canada Limited | Single space wireless parking with improved antenna placements |
| US9842455B2 (en) | 2011-03-03 | 2017-12-12 | J.J. Mackay Canada Limited | Single space parking meter and removable single space parking meter mechanism |
| US10192388B2 (en) | 2011-03-03 | 2019-01-29 | J.J. Mackay Canada Limited | Single space parking meter and removable single space parking meter mechanism |
| US10424147B2 (en) | 2011-03-03 | 2019-09-24 | J.J. Mackay Canada Limited | Parking meter with contactless payment |
| US9934645B2 (en) | 2011-03-03 | 2018-04-03 | J.J. Mackay Canada Limited | Parking meter with contactless payment |
| US12008856B2 (en) | 2011-03-03 | 2024-06-11 | J.J. Mackay Canada Limited | Single space parking meter and removable single space parking meter mechanism |
| US11699321B2 (en) | 2011-03-03 | 2023-07-11 | J.J Mackay Canada Limited | Parking meter with contactless payment |
| US10861278B2 (en) | 2011-03-03 | 2020-12-08 | J.J. Mackay Canada Limited | Parking meter with contactless payment |
| EP2790292A4 (en) * | 2012-05-10 | 2015-01-28 | Huawei Tech Co Ltd | Temporary back-up power system and temporary back-up power method |
| EP2790292A1 (en) * | 2012-05-10 | 2014-10-15 | Huawei Technologies Co., Ltd | Temporary back-up power system and temporary back-up power method |
| US20140059360A1 (en) * | 2012-08-23 | 2014-02-27 | Lifescan Scotland Limited | Power supplies management in an analyte device having primary and secondary batteries |
| US9652921B2 (en) | 2015-06-16 | 2017-05-16 | J.J. Mackay Canada Limited | Coin chute with anti-fishing assembly |
| US11978300B2 (en) | 2015-08-11 | 2024-05-07 | J.J. Mackay Canada Limited | Single space parking meter |
| US11972654B2 (en) | 2015-08-11 | 2024-04-30 | J.J. Mackay Canada Limited | Lightweight vandal resistant parking meter |
| USD863075S1 (en) | 2015-10-16 | 2019-10-15 | J.J. Mackay Canada Limited | Parking meter |
| USD863987S1 (en) | 2015-10-16 | 2019-10-22 | J.J. Mackay Canada Limited | Parking meter |
| USD863988S1 (en) | 2015-10-16 | 2019-10-22 | J.J. Mackay Canada Limited | Parking meter |
| USD863074S1 (en) | 2015-10-16 | 2019-10-15 | J. J. Mackay Canada Limited | Parking meter |
| USD863076S1 (en) | 2015-10-16 | 2019-10-15 | J. J. Mackay Canada Limited | Parking meter |
| US11762479B2 (en) | 2019-01-30 | 2023-09-19 | J.J. Mackay Canada Limited | SPI keyboard module for a parking meter and a parking meter having an SPI keyboard module |
| US11922756B2 (en) | 2019-01-30 | 2024-03-05 | J.J. Mackay Canada Limited | Parking meter having touchscreen display |
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