JPH11110049A - Water level controller - Google Patents
Water level controllerInfo
- Publication number
- JPH11110049A JPH11110049A JP27941697A JP27941697A JPH11110049A JP H11110049 A JPH11110049 A JP H11110049A JP 27941697 A JP27941697 A JP 27941697A JP 27941697 A JP27941697 A JP 27941697A JP H11110049 A JPH11110049 A JP H11110049A
- Authority
- JP
- Japan
- Prior art keywords
- water level
- level detection
- water
- power supply
- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、水槽の水位を段階
的に検出する複数本の水位検出用電極を水槽に備えた水
位制御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 a water level control device provided with a plurality of water level detecting electrodes for detecting the water level of a water tank in stages.
【０００２】[0002]
【従来の技術】水位検出箇所が２ヶ所以上あるような水
位制御装置を使用する場合、その検出箇所の数だけの検
出回路を駆動するためには、誤動作を防止するために、
各検出回路ごとに完全に分離されている電源を使用しな
ければならない。以下に図２に示す従来の水位検出回路
を参照して説明する。なお本説明では簡単にするため水
位検出箇所数は２ヶ所の場合を例にする。また、検出さ
れる対象物は、水、としているが、水に限らずに導電物
質ならば同じ原理である。また、電流検出回路として、
フォトカプラをＦＥＴにより駆動させる回路を例にとっ
たが、電流を検出できる回路であればこれに限らない。
なおこの回路では水位検出回路用の電源４９、５９は完
全に分離されているものとする。2. Description of the Related Art When a water level control device having two or more water level detection points is used, in order to drive the detection circuits as many as the number of the detection points, it is necessary to prevent malfunction.
A completely separate power supply must be used for each detection circuit. This will be described below with reference to the conventional water level detection circuit shown in FIG. In this description, for simplicity, the case where the number of water level detection points is two is exemplified. Further, the target object to be detected is water, but the principle is not limited to water, and the same principle can be applied to a conductive substance. Also, as a current detection circuit,
Although a circuit in which a photocoupler is driven by an FET is taken as an example, the circuit is not limited to this as long as it can detect a current.
In this circuit, it is assumed that the power supplies 49 and 59 for the water level detection circuit are completely separated.
【０００３】まず水槽１に水位１２だけ水１０が入って
いる場合を説明する。交流電源３の端子３１が正電圧の
場合、検出電流は交流電源端子３１→ダイオードブリッ
ジ６１→ダイオードブリッジ正側端子６１１→コンデン
サ４３と抵抗４４→ダイオードブリッジ負側端子６１２
→水位検出用電極２２→水１０→水位検出用電極２１→
交流電源端子３２の順序で電流が流れる。交流電源３の
端子３１が負電圧の場合は、ダイオードブリッジ６１ま
での電流の流れる順序が交流電源端子３２→水位検出用
電極２１→水１０→水位検出用電極２２→ダイオードブ
リッジ６１と逆になるだけで後は同じである。[0003] First, a case where water 10 is contained in water tank 1 by water level 12 will be described. When the terminal 31 of the AC power supply 3 has a positive voltage, the detected current is the AC power supply terminal 31 → the diode bridge 61 → the diode bridge positive terminal 611 → the capacitor 43 and the resistor 44 → the diode bridge negative terminal 612.
→ water level detection electrode 22 → water 10 → water level detection electrode 21 →
The current flows in the order of the AC power supply terminals 32. When the terminal 31 of the AC power supply 3 has a negative voltage, the order in which the current flows to the diode bridge 61 is reverse to the order of the AC power supply terminal 32 → water level detection electrode 21 → water 10 → water level detection electrode 22 → diode bridge 61. The rest is the same.
【０００４】つまり、水１０が水位１２にある場合は水
位検出用電極２１〜２２間に電流が流れ、その電流がコ
ンデンサ４３、抵抗４４を通る時に生じる電位差で抵抗
４６を介してＦＥＴ４７のゲートに電圧を与え、ＦＥＴ
がＯＮ状態になり、電源４９からフォトカプラ４８のＬ
ＥＤへ電流が流れ、フォトカプラ４８がＯＮして水位検
出回路６は作動する。この時水位検出回路７は、水位検
出用電極２１〜２３間には水が無く電流が流れないため
に作動せず、従って水位１２を検出できる。水１０が水
位１３まである場合は水位検出用電極２１〜２３間にも
電流が流れ、水位検出回路６、７ともに作動するので水
位１３を検出できる。水１０が水位１１までの場合は水
位検出用電極２１〜２２間、２１〜２３間の両方とも電
流が流れないので水位検出回路６、７ともに作動せず水
位１１を検出できる。以上のように水位検出回路の電源
が完全に独立していれば水位検出回路は問題なく作動す
る。ただし完全に独立した電源を用意するには、回路構
成は複雑になってしまう。That is, when the water 10 is at the water level 12, a current flows between the water level detecting electrodes 21 to 22, and a potential difference generated when the current passes through the capacitor 43 and the resistor 44 is applied to the gate of the FET 47 via the resistor 46. Give voltage, FET
Is turned ON, and the L of the photocoupler 48 is
A current flows to the ED, the photocoupler 48 turns on, and the water level detection circuit 6 operates. At this time, the water level detection circuit 7 does not operate because there is no water between the water level detection electrodes 21 to 23 and no current flows, so that the water level 12 can be detected. When the water 10 reaches the water level 13, a current also flows between the water level detection electrodes 21 to 23, and both the water level detection circuits 6 and 7 operate, so that the water level 13 can be detected. When the water 10 reaches the water level 11, no current flows between the water level detection electrodes 21 to 22 and 21 to 23, so that the water level detection circuits 6 and 7 do not operate and the water level 11 can be detected. As described above, if the power supply of the water level detection circuit is completely independent, the water level detection circuit operates without any problem. However, preparing a completely independent power supply requires a complicated circuit configuration.
【０００５】次に、回路構成を簡略化するために、電源
４９と電源５９を完全に分離せず１つにした場合の説明
を図３を参照にして説明する。この回路では電源は４９
の１つだけとした。水槽１の中の水１０が水位１２だけ
入っているとき、水位検出回路８は上記で述べた説明と
同じ原理で作動する。しかし、特に交流電源３の端子３
１が正電圧の場合に限って、電流が、交流電源端子３１
→水位検出回路９のダイオードブリッジ７１→ダイオー
ドブリッジ正側端子７１１→コンデンサ５３と抵抗５４
→水位検出回路８のダイオードブリッジ負側端子６１２
→ダイオードブリッジ６１→水位検出用電極２２→水１
０→水位検出用電極２１→交流電源端子３２という迂回
経路を流れてしまう。これによってＦＥＴ５７がＯＮ
し、電源４９からフォトカプラ５８のＬＥＤに電流が流
れ、フォトカプラ５８がＯＮし、水位検出回路９も作動
してしまい、水１０は水位１３まであるものと認識さ
れ、誤検出となってしまう。Next, in order to simplify the circuit configuration, a case where the power supply 49 and the power supply 59 are integrated without being completely separated will be described with reference to FIG. In this circuit, the power supply is 49
And only one. When the water 10 in the aquarium 1 is only at the water level 12, the water level detection circuit 8 operates on the same principle as described above. However, especially the terminal 3 of the AC power supply 3
Only when 1 is a positive voltage, the current is
→ Diode bridge 71 of water level detection circuit 9 → Diode bridge positive terminal 711 → Capacitor 53 and resistor 54
→ Negative terminal 612 of diode bridge of water level detection circuit 8
→ Diode bridge 61 → Water level detection electrode 22 → Water 1
It flows in a detour path of 0 → water level detection electrode 21 → AC power supply terminal 32. This turns on FET57
Then, a current flows from the power supply 49 to the LED of the photocoupler 58, the photocoupler 58 is turned on, the water level detection circuit 9 is also activated, and the water 10 is recognized as having the water level 13 and is erroneously detected. .
【０００６】[0006]
【発明が解決しようとする課題】以上に述べたように、
水位検出箇所が２ヶ所以上ある場合、各水位検出回路の
電源は完全に分離していないと、電流が迂回経路を流れ
ることにより、水を検出しないはずの水位検出回路が誤
検出してしまう。このために各検出回路ごとに完全に分
離した電源を作らねばならず回路的に複雑になってしま
う。本発明は上述した点に鑑みて創案されたもので、そ
の目的とするところは、これらの欠点を解決し、誤検出
がなく、且つ簡単な回路構成となる水位制御装置を提供
するものである。As described above, as described above,
In the case where there are two or more water level detection points, if the power supplies of the water level detection circuits are not completely separated, the current flows through the detour path, and the water level detection circuit that should not detect water will erroneously detect. For this reason, a completely separate power supply must be made for each detection circuit, which complicates the circuit. SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to provide a water level control device which solves these drawbacks, has no erroneous detection, and has a simple circuit configuration. .
【０００７】[0007]
【課題を解決するための手段】つまり、その目的を達成
するための手段は、 １）請求項１において、水槽の水位を段階的に検出する
複数本の水位検出用電極を水槽に備え、この水槽の最低
位に位置する共通とする水位検出用電極以外の各水位検
出用電極にそれぞれ電源を有する水位検出回路を備えた
水位制御装置おいて、交流電源の一方は、前記水槽の最
低位に位置する共通とする水位検出用電極に接続する。
交流電源の他方は、前記最低位の水位検出用電極以外の
各水位検出用電極によって制御されるそれぞれの水位検
出回路の共通とする負側に接続する。前記それぞれの水
位検出回路の正側は、２個同方向に直列接続されたダイ
オードのカソード端に接続され、前記同方向に２個直列
接続されたダイオードのアノード端を、前記水位検出回
路の負側に接続し、前記最低位の水位検出用電極以外の
水位検出用電極を、直列接続したダイオードのカソード
・アノード接続点に接続してそれぞれ半波整流回路を形
成すると共に、前記各水位検出回路の電源を共通とした
ものである。Means for achieving the object are as follows: 1) In claim 1, the water tank is provided with a plurality of water level detecting electrodes for detecting the water level of the water tank in stages. In a water level control device including a water level detection circuit having a power supply for each water level detection electrode other than the common water level detection electrode located at the lowest position of the water tank, one of the AC power supplies is at the lowest position of the water tank. Connect to a common water level detection electrode located.
The other side of the AC power supply is connected to a common negative side of each water level detection circuit controlled by each water level detection electrode other than the lowest water level detection electrode. The positive side of each of the water level detection circuits is connected to the cathode end of two diodes connected in series in the same direction, and the anode end of the two diodes connected in series in the same direction is connected to the negative end of the water level detection circuit. Side, and a water level detection electrode other than the lowest water level detection electrode is connected to a cathode-anode connection point of a diode connected in series to form a half-wave rectifier circuit, and the respective water level detection circuits are connected. Power supply is common.
【０００８】２）請求項２において、交流電源極性によ
り変えられる電流経路において、両経路のインピーダン
スを等しくすることにより両方向の電流値を等しくし
て、電極の化学的変化を防止する請求項１記載のもので
ある。すなわち、この問題は水位検出回路の入力側が全
波整流回路で構成されているために、水位検出回路用電
源を共通にした場合、水位検出回路入力の交流電源接続
側が正電圧となった場合に水位検出回路が両方とも作動
してしまうような回路構成のために起こる問題であり、
水位検出回路の入力側を半波整流回路とすることによっ
て解決できる。[0008] In the second aspect, in the current path changed by the polarity of the AC power supply, the impedance of both paths is equalized to equalize the current value in both directions, thereby preventing a chemical change of the electrode. belongs to. That is, this problem is caused by the fact that the input side of the water level detection circuit is constituted by a full-wave rectifier circuit, so that when the power supply for the water level detection circuit is shared, the AC power connection side of the water level detection circuit input becomes a positive voltage. This is a problem that occurs because of a circuit configuration in which both the water level detection circuits operate.
This can be solved by using a half-wave rectifier circuit on the input side of the water level detection circuit.
【０００９】その作用は、水位検出回路の交流電源接続
側が負電圧の場合のみ電流検出回路に電流が流れるよう
にした半波整流回路を水位検出回路の入力側に構成し、
交流電源接続側が正電圧の場合には電流検出回路に電流
が流れないようにすれば、水位検出回路は、水を検出し
た回路のみが作動することになり、水位検出回路を誤動
作なく作動できる回路となる。ただし、半波整流にする
と電流が片方向にしか流れず水位検出用電極に悪影響を
及ぼすので、水位検出用電極には双方向に電流が流れる
ように回路を工夫する必要がある。The function is as follows. A half-wave rectifier circuit is provided on the input side of the water level detection circuit, in which a current flows through the current detection circuit only when the AC power supply connection side of the water level detection circuit has a negative voltage.
If current is not allowed to flow to the current detection circuit when the AC power supply connection side is a positive voltage, the water level detection circuit will operate only the circuit that detected water, and the water level detection circuit can operate without malfunction. Becomes However, half-wave rectification causes a current to flow in only one direction and adversely affects the water level detection electrode. Therefore, it is necessary to devise a circuit so that current flows in the water level detection electrode in both directions.
【００１０】以下、本発明の一実施例を図面に基づいて
詳述する。Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
【発明の実施の形態】図１は本発明の一実施例を示す回
路図であり、図中、図２と同符号のものは同じ構成、機
能を有する部分である。図１において、前述で問題とな
った水槽１に水１０が水位１２まである場合の説明とす
る。交流電源３の端子３１が負電圧の場合、電流は交流
電源端子３２→水位検出用電極２１→水１０→水位検出
用電極２２→ダイオード４１→コンデンサ４３と抵抗４
４→交流電源端子３１の順に流れ、抵抗４６を介してＦ
ＥＴ４７をＯＮし、電源４９からフォトカプラ４８のＬ
ＥＤに電流が流れてフォトカプラ４８をＯＮし水位検出
回路４が作動する。FIG. 1 is a circuit diagram showing an embodiment of the present invention. In FIG. 1, the same reference numerals as in FIG. 2 denote portions having the same configuration and function. In FIG. 1, a description will be given of a case where the water 10 has a water level of up to a water level 12 in the water tank 1 which has become a problem as described above. When the terminal 31 of the AC power supply 3 has a negative voltage, the current is supplied to the AC power supply terminal 32 → water level detection electrode 21 → water 10 → water level detection electrode 22 → diode 41 → capacitor 43 and resistor 4
4 → AC power supply terminal 31 flows in this order, and F
ET47 is turned on, and the power of the photocoupler 48 is
A current flows through the ED to turn on the photocoupler 48, and the water level detection circuit 4 operates.
【００１１】交流電源３の端子３１が正電圧の場合は、
電流は交流電源端子３１→抵抗４５→ダイオード４２→
水位検出用電極２２→水１０→水位検出用電極２１→交
流電源端子３２と流れ、ＦＥＴ４７をＯＮしない。従っ
て水１０が水位１２にある場合は交流電源３の端子３１
が負電圧の場合のみにＦＥＴ４７をＯＮし水位検出回路
４が作動するということである。この時水位検出回路５
には電流は全く流れないので水位検出回路５は作動せ
ず、従って水位１２が検出できる。以上が請求項１の実
施例による説明である。When the terminal 31 of the AC power supply 3 has a positive voltage,
The current is the AC power supply terminal 31 → resistor 45 → diode 42 →
The water flows from the water level detection electrode 22 → water 10 → water level detection electrode 21 → AC power supply terminal 32, and the FET 47 is not turned on. Therefore, when the water 10 is at the water level 12, the terminal 31 of the AC power supply 3
Only when the voltage is negative, the FET 47 is turned on and the water level detection circuit 4 operates. At this time, the water level detection circuit 5
Does not flow at all, the water level detection circuit 5 does not operate, and thus the water level 12 can be detected. The above is the description of the first embodiment.
【００１２】上記説明中の交流電源３がどちらの極性に
ある場合でも、流れる電流値が同じになるように抵抗４
５の値を設定すれば、水位検出用電極には両方向の電流
が同じだけ流れることにより電極の化学変化を防止でき
る。以上が請求項２の実施例による説明である。Regardless of the polarity of the AC power supply 3 described above, the resistance 4
If a value of 5 is set, the same current in both directions flows through the water level detection electrode, so that a chemical change of the electrode can be prevented. The above is the description of the second embodiment.
【００１３】[0013]
【発明の効果】以上説明したように本発明によれば、水
位検出箇所が２ヶ所以上ある場合でも水位検出回路用電
源を１つだけですみ、且つ回路構成を簡単にでき、実用
上、極めて有用性の高いものである。As described above, according to the present invention, even when there are two or more water level detection points, only one power supply for the water level detection circuit is required, and the circuit configuration can be simplified. It is highly useful.
【図１】本発明の一実施例を示す回路図である。FIG. 1 is a circuit diagram showing one embodiment of the present invention.
【図２】従来の一例を示す 路図である。FIG. 2 is a road diagram showing an example of the related art.
【図３】従来の二例を示す回路図である。FIG. 3 is a circuit diagram showing two conventional examples.
１ 水槽 １０ 水 １１ 水位 １２ 水位 １３ 水位 ２１ 水位検出用電極 ２２ 水位検出用電極 ２３ 水位検出用電極 ３ 交流電源 ３１ 交流電源端子 ３２ 交流電源端子 ４ 水位検出回路 ４１ ダイオード ４２ ダイオード ４３ コンデンサ ４４ 抵抗器 ４５ 抵抗器 ４６ 抵抗器 ４７ ＦＥＴ ４８ フォトカプラ ４９ 水位検出回路用電源 ５ 水位検出回路 ５１ ダイオード ５２ ダイオード ５３ コンデンサ ５４ 抵抗器 ５５ 抵抗器 ５６ 抵抗器 ５７ ＦＥＴ ５８ フォトカプラ ５９ 水位検出回路用電源 ６ 水位検出回路 ６１ ダイオードブリッジ ６１ ダイオードブリッジ正側端子 ６１ ダイオードブリッジ負側端子 ７ 水位検出回路 ７１ ダイオードブリッジ ７１ ダイオードブリッジ正側端子 ７１ ダイオードブリッジ負側端子 ８ 水位検出回路 ９ 水位検出回路 Reference Signs List 1 water tank 10 water 11 water level 12 water level 13 water level 21 water level detection electrode 22 water level detection electrode 23 water level detection electrode 3 AC power supply 31 AC power supply terminal 32 AC power supply terminal 4 Water level detection circuit 41 Diode 42 Diode 43 Capacitor 44 Resistor 45 Resistor 46 Resistor 47 FET 48 Photocoupler 49 Power supply for water level detection circuit 5 Water level detection circuit 51 Diode 52 Diode 53 Capacitor 54 Resistor 55 Resistor 56 Resistor 57 FET 58 Photocoupler 59 Power supply for water level detection circuit 6 Water level detection circuit 61 Diode Bridge 61 Diode Bridge Positive Terminal 61 Diode Bridge Negative Terminal 7 Water Level Detection Circuit 71 Diode Bridge 71 Diode Bridge Positive Terminal 71 Diode Bridge Negative Terminal 8 Water Level Detection Circuit 9 Water Level Out circuit
Claims (2)
水位検出用電極を水槽に備え、この水槽の最低位に位置
する共通とする水位検出用電極以外の各水位検出用電極
にそれぞれ電源を有する水位検出回路を備えた水位制御
装置おいて、 交流電源の一方は、前記水槽の最低位に位置する共通と
する水位検出用電極に接続し、 交流電源の他方は、前記最低位の水位検出用電極以外の
各水位検出用電極によって制御されるそれぞれの水位検
出回路の共通とする負側に接続され、 前記それぞれの水位検出回路の正側は、２個同方向に直
列接続されたダイオードのカソード端に接続され、 前記同方向に２個直列接続されたダイオードのアノード
端を、前記水位検出回路の負側に接続し、 前記最低位の水位検出用電極以外の水位検出用電極を、
直列接続したダイオードのカソード・アノード接続点に
接続してそれぞれ半波整流回路を形成すると共に、前記
各水位検出回路の電源を共通としたことを特徴とする水
位制御装置。A plurality of water level detection electrodes for detecting the water level of a water tank in stages are provided in a water tank, and each of the water level detection electrodes other than a common water level detection electrode located at the lowest position of the water tank is provided. In a water level control device provided with a water level detection circuit having a power supply, one of the AC power supplies is connected to a common water level detection electrode located at the lowest position of the water tank, and the other of the AC power supplies is connected to the lowest level. The water level detection circuits controlled by the respective water level detection electrodes other than the water level detection electrodes are connected to a common negative side of the respective water level detection circuits, and two positive sides of the respective water level detection circuits are connected in series in the same direction. An anode end of two diodes connected in series in the same direction, connected to a cathode end of the diode, is connected to a negative side of the water level detection circuit, and a water level detection electrode other than the lowest water level detection electrode is connected. ,
A water level control device, wherein a half-wave rectifier circuit is formed by connecting each of the series-connected diodes to a cathode / anode connection point, and a power source of each of the water level detection circuits is common.
おいて、両経路のインピーダンスを等しくすることによ
り両方向の電流値を等しくして、電極の化学的変化を防
止する請求項１記載の水位制御装置。2. The water level control device according to claim 1, wherein in a current path changed by the polarity of the AC power supply, the impedance of both paths is made equal to make the current values in both directions equal, thereby preventing a chemical change of the electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27941697A JP3614285B2 (en) | 1997-09-29 | 1997-09-29 | Water level control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27941697A JP3614285B2 (en) | 1997-09-29 | 1997-09-29 | Water level control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11110049A true JPH11110049A (en) | 1999-04-23 |
| JP3614285B2 JP3614285B2 (en) | 2005-01-26 |
Family
ID=17610793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27941697A Expired - Fee Related JP3614285B2 (en) | 1997-09-29 | 1997-09-29 | Water level control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3614285B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102508500A (en) * | 2011-11-02 | 2012-06-20 | 文应刚 | Water level control circuit used for heating purified water and heating container |
| CN103914087A (en) * | 2014-04-09 | 2014-07-09 | 淮南矿业(集团)有限责任公司 | Water supply automatic control system |
| CN104199473A (en) * | 2014-09-17 | 2014-12-10 | 山东大学 | Alternating-current electrode type water level detecting control circuit |
| CN104597925A (en) * | 2015-02-05 | 2015-05-06 | 魏春华 | Economic automatic water supply control circuit |
| CN106227250A (en) * | 2016-10-13 | 2016-12-14 | 四川森迪科技发展股份有限公司 | A kind of plant drinking trough water level control system |
| CN106292754A (en) * | 2016-10-13 | 2017-01-04 | 四川森迪科技发展股份有限公司 | A kind of plant drinking trough voltage stabilizing adjusting type water level control system |
| CN106292755A (en) * | 2016-10-13 | 2017-01-04 | 四川森迪科技发展股份有限公司 | Plant based on current buffering protection circuit drinking trough water level control system |
| CN106483988A (en) * | 2016-10-13 | 2017-03-08 | 四川森迪科技发展股份有限公司 | A kind of plant drinking trough potential pulse adjusting type water level control system |
| CN108205335A (en) * | 2017-12-20 | 2018-06-26 | 厦门市逢兴机电设备有限公司 | Water level automatic control device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872201B (en) * | 2010-06-28 | 2011-09-28 | 兰如根 | Water level controller without ionizing and electrolyzing water |
-
1997
- 1997-09-29 JP JP27941697A patent/JP3614285B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102508500A (en) * | 2011-11-02 | 2012-06-20 | 文应刚 | Water level control circuit used for heating purified water and heating container |
| CN103914087A (en) * | 2014-04-09 | 2014-07-09 | 淮南矿业(集团)有限责任公司 | Water supply automatic control system |
| CN104199473A (en) * | 2014-09-17 | 2014-12-10 | 山东大学 | Alternating-current electrode type water level detecting control circuit |
| CN104199473B (en) * | 2014-09-17 | 2017-01-11 | 山东大学 | Alternating-current electrode type water level detecting control circuit |
| CN104597925A (en) * | 2015-02-05 | 2015-05-06 | 魏春华 | Economic automatic water supply control circuit |
| CN106227250A (en) * | 2016-10-13 | 2016-12-14 | 四川森迪科技发展股份有限公司 | A kind of plant drinking trough water level control system |
| CN106292754A (en) * | 2016-10-13 | 2017-01-04 | 四川森迪科技发展股份有限公司 | A kind of plant drinking trough voltage stabilizing adjusting type water level control system |
| CN106292755A (en) * | 2016-10-13 | 2017-01-04 | 四川森迪科技发展股份有限公司 | Plant based on current buffering protection circuit drinking trough water level control system |
| CN106483988A (en) * | 2016-10-13 | 2017-03-08 | 四川森迪科技发展股份有限公司 | A kind of plant drinking trough potential pulse adjusting type water level control system |
| CN108205335A (en) * | 2017-12-20 | 2018-06-26 | 厦门市逢兴机电设备有限公司 | Water level automatic control device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3614285B2 (en) | 2005-01-26 |
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