JPH06105571B2 - AC switch input device - Google Patents
AC switch input deviceInfo
- Publication number
- JPH06105571B2 JPH06105571B2 JP60258012A JP25801285A JPH06105571B2 JP H06105571 B2 JPH06105571 B2 JP H06105571B2 JP 60258012 A JP60258012 A JP 60258012A JP 25801285 A JP25801285 A JP 25801285A JP H06105571 B2 JPH06105571 B2 JP H06105571B2
- Authority
- JP
- Japan
- Prior art keywords
- switch
- voltage
- input
- input circuit
- power supply
- 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.)
- Expired - Fee Related
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000007257 malfunction Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Keying Circuit Devices (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、電気洗濯機の水位検知スイッチや、ふたスイ
ッチの入力装置等、湿度によるスイッチの接点間リーク
が起きやすい交流スイッチ入力装置に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC switch input device, such as a water level detection switch of an electric washing machine and an input device of a lid switch, which is liable to cause leakage between switches due to humidity. .
従来の技術 従来、この種の交流スイッチ入力装置は第４図に示すよ
うな構成であった。すなわち、交流電源11の開閉を行う
スイッチ12には抵抗13を介して入力回路15の入力端子Pi
に接続されている。この入力回路15は入力端子Piの電圧
が一定のしきい値以下になった場合にスイッチ12が閉じ
ていると判断する。16は入力回路15の直流電源であり、
17および18は入力回路15の入力端子Piの電圧を制限する
ダイオードである。抵抗13はダイオード17,18に流れる
電流を制限するものである。2. Description of the Related Art Conventionally, this type of AC switch input device has a configuration as shown in FIG. That is, the switch 12 for opening and closing the AC power supply 11 is connected to the input terminal Pi of the input circuit 15 via the resistor 13.
It is connected to the. The input circuit 15 determines that the switch 12 is closed when the voltage at the input terminal Pi becomes equal to or lower than a certain threshold value. 16 is the DC power supply of the input circuit 15,
Reference numerals 17 and 18 are diodes that limit the voltage at the input terminal Pi of the input circuit 15. The resistor 13 limits the current flowing through the diodes 17 and 18.
このような構成の交流スイッチ入力装置の動作を、第４
図および第５図を参照しながら説明する。まず、スイッ
チ12が閉じられた場合、交流電源11の電圧VACは、入力
回路15の入力端子Piに印加される。この入力端子Piの印
加電圧Viはダイオード17,18により制限され交流電源11
の電圧に比べて直流電源16の電圧が低いため、交流電源
11の正弦波電圧の両端を直流電源16の電圧が残るように
クリップした電圧波形は、交流電源11の周期に同期した
ほぼ方形波となる。第５図においてVDCは入力回路15の
直流電源16の正電位、VGは接地電位、VSは入力判定のし
きい値の電位であり、入力電圧Viが半波おきにVSより低
くなれば入力回路15は入力がLOであると判断する。これ
によりスイッチ12が閉じられた場合は、入力回路15は交
流電源11の周期に同期したほぼ方形波に近い波形を入力
し、スイッチ12が閉じられていると判断する。The operation of the AC switch input device having such a configuration is described in the fourth section.
Description will be made with reference to FIGS. First, when the switch 12 is closed, the voltage V AC of the AC power supply 11 is applied to the input terminal Pi of the input circuit 15. The voltage Vi applied to this input terminal Pi is limited by the diodes 17 and 18, and the AC power supply 11
The voltage of the DC power supply 16 is lower than the
The voltage waveform obtained by clipping both ends of the sine wave voltage of 11 so that the voltage of the DC power supply 16 remains becomes a substantially square wave synchronized with the cycle of the AC power supply 11. In FIG. 5, V DC is the positive potential of the DC power supply 16 of the input circuit 15, V G is the ground potential, V S is the potential of the threshold value for input judgment, and the input voltage V i is less than V S at every half wave. If it becomes low, the input circuit 15 determines that the input is LO. As a result, when the switch 12 is closed, the input circuit 15 inputs a waveform close to a square wave synchronized with the cycle of the AC power supply 11, and determines that the switch 12 is closed.
発明が解決しようとする問題点 このような従来の構成では、スイッチ12の接点間に水滴
等が付着し抵抗値が数十ＫΩ〜100KΩ程度になった場合
でも入力回路15の入力端子Piには、スイッチ12が閉じら
れた場合とほとんど同じ電圧が印加され、それによって
入力回路15はスイッチ12が閉じられていると誤って判断
してしまう。Problems to be Solved by the Invention With such a conventional configuration, even if water droplets or the like adhere between the contacts of the switch 12 and the resistance value becomes several tens KΩ to 100 KΩ, the input terminal Pi of the input circuit 15 has , The same voltage as when the switch 12 is closed is applied, which causes the input circuit 15 to erroneously determine that the switch 12 is closed.
本発明はこのような問題点を解決するもので、スイッチ
に水滴などが付着しても誤動作を起こさないようにする
ことを目的とするものである。The present invention solves such a problem, and an object of the present invention is to prevent malfunction even if water droplets or the like adhere to the switch.
問題点を解決するための手段 この問題点を解決するために本発明は、交流電圧を開閉
するスイッチと、このスイッチに直列に接続され交流電
圧を分圧する複数個の抵抗と、前記抵抗により分圧され
た電圧が一定のしきい値を越えることにより前記スイッ
チの開閉を検知する入力回路を備え、前記抵抗の分圧比
は、前記スイッチの接点間の抵抗値が接点の接触抵抗の
最大値を越えた場合は、前記抵抗により分圧された電圧
が前記入力回路のしきい値を越えないように設定された
交流スイッチ入力装置とするものである。Means for Solving the Problems In order to solve this problem, the present invention provides a switch for opening and closing an AC voltage, a plurality of resistors connected in series with the switch for dividing the AC voltage, and a resistor for dividing the AC voltage. An input circuit for detecting the opening and closing of the switch when the pressure applied exceeds a certain threshold value, the voltage division ratio of the resistance, the resistance value between the contacts of the switch is the maximum value of the contact resistance of the contacts. When it exceeds, the voltage divided by the resistor is set as an AC switch input device which is set so as not to exceed the threshold value of the input circuit.
作用 この構成により、スイッチを閉じた場合は電源電圧の最
大値付近でのみ入力回路の入力電圧がしきい値を越え入
力がなされるが、スイッチの接点間に水滴等が付着した
場合は入力電圧はしきい値を越えないため入力はされな
い。この結果、スイッチの接点に水滴等が付着しても誤
動作することがなくなる。Operation With this configuration, when the switch is closed, the input voltage of the input circuit exceeds the threshold value and the input is made only near the maximum value of the power supply voltage.However, if water drops or the like adhere between the contacts of the switch, the input voltage Is not input because it does not exceed the threshold. As a result, malfunction does not occur even if water droplets or the like are attached to the contacts of the switch.
実施例 以下、本発明の一実施例について第１図〜第３図を参照
して説明する。Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.
第１図において交流電源１はスイッチ２により開閉が行
われる。交流電源１の電圧は抵抗3,4により分圧され入
力回路５の入力端子Piに印加される。この入力回路５は
入力端子Piの電圧が一定のしきい値以下になるとスイッ
チ２が閉じていると判断する。また、入力回路５は直流
電源６が接続され入力端子Piの印加電圧はダイオード7,
8で制限されている。９はダイオード7,8に流れる電流を
制限する抵抗である。In FIG. 1, the AC power supply 1 is opened and closed by a switch 2. The voltage of the AC power supply 1 is divided by the resistors 3 and 4 and applied to the input terminal Pi of the input circuit 5. The input circuit 5 determines that the switch 2 is closed when the voltage at the input terminal Pi becomes a certain threshold value or less. A DC power supply 6 is connected to the input circuit 5 and the voltage applied to the input terminal Pi is diode 7,
Limited by 8. Reference numeral 9 is a resistor that limits the current flowing through the diodes 7 and 8.
このような構成において以下、第２図および第３図を参
照しながら動作を説明する。スイッチ２が閉じられた場
合、交流電源１の電圧VACは、抵抗３と抵抗４により分
圧されて降圧され、入力回路５の入力端子Piに印加され
る。この入力電圧Viはダイオード７により電圧の高い側
はVDCより0.7V程度高い電圧で制限され、電圧の低い側
は抵抗3,4の分圧比によって、交流電圧の最大値の点を
中心に、半波の約３分の１の範囲のみが入力のしきい値
を越えるように設定されている。入力回路５は交流電源
１の電圧VACの最大値となるタイミングで入力を判断
し、これにより、スイッチ２が閉じられていると判断す
る。The operation of this structure will be described below with reference to FIGS. 2 and 3. When the switch 2 is closed, the voltage V AC of the AC power supply 1 is divided by the resistors 3 and 4 to be stepped down and applied to the input terminal Pi of the input circuit 5. This input voltage Vi is limited by the diode 7 to a voltage higher than V DC by about 0.7V on the high voltage side, and the low voltage side is centered on the maximum value of the AC voltage due to the voltage division ratio of the resistors 3 and 4, Only about one-third of the half wave is set to exceed the input threshold. The input circuit 5 judges the input at the timing when the voltage V AC of the AC power supply 1 reaches the maximum value, and thereby judges that the switch 2 is closed.
又、スイッチ２の接点間に水滴が付着した場合は、スイ
ッチ２の接点間が数十ＫΩ〜百ＫΩで短絡された状態と
なる。しかし、この場合の抵抗３の両端電圧はスイッチ
２が閉じられた場合に比べて低くなり、入力回路５の入
力端子Piに印加される電圧は、第３図に示されるよう
に、入力のしきい値を越えることはない。これにより、
スイッチ２の接点間に水滴が付着しても、誤まってスイ
ッチ２が閉じられていると判断することはなくなる。Further, when water droplets adhere to the contacts of the switch 2, the contacts of the switch 2 are short-circuited by several tens KΩ to 100 KΩ. However, the voltage across the resistor 3 in this case is lower than that when the switch 2 is closed, and the voltage applied to the input terminal Pi of the input circuit 5 is the input voltage as shown in FIG. It does not exceed the threshold. This allows
Even if water droplets adhere to the contacts of the switch 2, it is no longer erroneously determined that the switch 2 is closed.
発明の効果 以上のように本発明によれば、交流電圧の最大値付近の
電圧を使ってスイッチの開閉を判断しているために、ス
イッチの接点間に水滴が付着した程度では、入力として
受付けないため誤動作を起こすことがなくなるという効
果が得られる。EFFECTS OF THE INVENTION As described above, according to the present invention, the opening / closing of the switch is determined by using the voltage in the vicinity of the maximum value of the AC voltage. Since it does not exist, the effect that the malfunction does not occur can be obtained.
第１図は本発明の一実施例による交流スイッチ入力装置
の構成図、第２図は本発明の一実施例におけるスイッチ
を閉じた場合の各部の波形図、第３図は本発明の一実施
例におけるスイッチの接点間に水滴が付着した場合の各
部の波形図、第４図は従来例における交流スイッチ入力
装置の構成図、第５図は従来例におけるスイッチを閉じ
た場合の各部の波形図である。 １……交流電源、２……スイッチ、3,4……抵抗、５…
…入力回路、６……直流電源、7,8……ダイオード、９
……抵抗。FIG. 1 is a block diagram of an AC switch input device according to an embodiment of the present invention, FIG. 2 is a waveform diagram of respective parts when a switch is closed in an embodiment of the present invention, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a waveform diagram of each part when water droplets are attached between the contacts of the switch in the example, FIG. 4 is a configuration diagram of an AC switch input device in the conventional example, and FIG. 5 is a waveform diagram of each part when the switch in the conventional example is closed. Is. 1 ... AC power supply, 2 ... switch, 3,4 ... resistance, 5 ...
… Input circuit, 6 …… DC power supply, 7,8 …… Diode, 9
……resistance.
Claims (2)
ッチに直列に接続され交流電圧を分圧する複数個の抵抗
と、前記抵抗により分圧された電圧が一定のしきい値を
越えることにより前記スイッチの開閉を検知する入力回
路を備え、前記抵抗の分圧比は、前記スイッチの接点間
の抵抗値が接点の接触抵抗の最大値を越えた場合は、前
記抵抗により分圧された電圧が前記入力回路のしきい値
を越えないように設定された交流スイッチ入力装置。1. A switch for opening and closing an AC voltage, a plurality of resistors connected in series to the switch for dividing the AC voltage, and a voltage divided by the resistors exceeding a certain threshold value. An input circuit for detecting the opening and closing of a switch is provided, and the voltage division ratio of the resistance is such that when the resistance value between the contacts of the switch exceeds the maximum contact resistance of the contacts, the voltage divided by the resistance is AC switch input device set so that the threshold of the input circuit is not exceeded.
入力を判断する、入力回路を備えた特許請求の範囲第１
項記載の交流スイッチ入力装置。2. The input circuit according to claim 1, further comprising an input circuit for determining input at a time near a maximum value of the AC voltage.
AC switch input device according to the item.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60258012A JPH06105571B2 (en) | 1985-11-18 | 1985-11-18 | AC switch input device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60258012A JPH06105571B2 (en) | 1985-11-18 | 1985-11-18 | AC switch input device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62117225A JPS62117225A (en) | 1987-05-28 |
| JPH06105571B2 true JPH06105571B2 (en) | 1994-12-21 |
Family
ID=17314304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60258012A Expired - Fee Related JPH06105571B2 (en) | 1985-11-18 | 1985-11-18 | AC switch input device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06105571B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009191856A (en) * | 2009-06-04 | 2009-08-27 | Nissan Diesel Motor Co Ltd | Cylinder head cooling structure |
| BR112016001638A2 (en) * | 2013-07-29 | 2017-08-01 | Honda Motor Co Ltd | switch operation determination device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS415719Y1 (en) * | 1964-07-23 | 1966-03-26 | ||
| JPS50133511U (en) * | 1974-04-17 | 1975-11-04 | ||
| JPS50134104U (en) * | 1974-04-20 | 1975-11-05 |
-
1985
- 1985-11-18 JP JP60258012A patent/JPH06105571B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62117225A (en) | 1987-05-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |