CN106104225B - Condenser type water level detection circuit - Google Patents
Condenser type water level detection circuit Download PDFInfo
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- CN106104225B CN106104225B CN201580014885.3A CN201580014885A CN106104225B CN 106104225 B CN106104225 B CN 106104225B CN 201580014885 A CN201580014885 A CN 201580014885A CN 106104225 B CN106104225 B CN 106104225B
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- capacitor
- water level
- electrode
- level detection
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
- G01F23/266—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors measuring circuits therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
- G01F23/268—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors mounting arrangements of probes
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The present invention relates to condenser type water level detection circuits, the embodiment of the present invention of unnecessary frequent detection operation and flutter phenomenon caused by according to that can prevent the water surface of liquid from swinging, it provides a kind of for including the sensor rod for forming first electrode, and it is separated by the condenser type water level detection circuit of the capacitor water level detection gauge of the conduit of the hollow tube form of a part formation second electrode of receiving the sensor stick, it is in the condenser type water level detection circuit for being integrated in the circuit board having in above-mentioned catheter interior and passing through the variable quantity of first electrode and second electrode detection capacitor to measure water level, it include: detection circuit portion, including having the capacitor of a certain size capacitor, and more above-mentioned capacitor capacitor and by capacitor that above-mentioned first electrode and second electrode measure to export high (High) signal and low (Low) signal First control unit is respectively connected with clock line and data line in multiple communication port；Delay circuit portion, it is in parallel with above-mentioned first control unit by above-mentioned clock line and data line, and postponed to export high RST or low signal after certain time according to the output signal of above-mentioned first control unit；And output circuit portion, high RST or low signal are worn by output terminal outside Winter Solstice according to the output signal in above-mentioned delay circuit portion, and obtain the supply of the DC voltage for circuit drives.
Description
Technical field
The present invention relates to condenser type water level detection circuits, more particularly to are not submerged using the part being submerged in liquid and
Part between capacitance difference sensed water level condenser type water level detection circuit.
Background technique
The technology for measuring the water level of liquid is developed to electronic type from floating (float) instrument mode, magnet-type instrument mode
Instrument mode.Prima facie example of electronic type level measuring mode has capacitive way, this is can to solve floating instrument simultaneously
The best mode of the error rate and fraction defective of mode or magnet-type instrument mode.
Above-mentioned condenser type water level detection gauge attracts attention in terms of precision, economy, as shown in Figure 1, comprising: container master
Body 1, for taking care of liquid and its outer wall composition external electrode；Probe 3, the upper cover for being incorporated into said vesse main body 1 extend to down
Side simultaneously constitutes internal electrode；Controller 5 measures water according to the capacitance variations measured by said external electrode and internal electrode
Position.Above-mentioned condenser type water level detection gauge is according to the capacitor between the liquid height detecting electrode between internal electrode and external electrode
Variation, with this sensed water level.
But usually take care of and be also easy to happen water surface swing in external subtle shaking in the liquid in container body,
Therefore, the condenser type water level detection gauge of the prior art repeats sensed water level in a very short period of time, and flutter phenomenon necessarily occurs.
Therefore, the condenser type water level detection gauge of the prior art is drawn because of unnecessary frequent detection operation and flutter phenomenon
Error running is played, shortens the service life of element, to reduce reliability and durability.
Summary of the invention
Technical task
It is an object of the invention to overcome the deficiency of the prior art and providing one kind can prevent the water surface swing of liquid from causing
Unnecessary frequent detection operation and flutter phenomenon condenser type water level detection circuit.
Solution
In order to achieve the above objectives, the embodiment of the present invention provides a kind of for including the sensor rod for forming first electrode,
And it is separated by the capacitor water level detection gauge of the conduit of the hollow tube form of a part formation second electrode of receiving the sensor stick
Condenser type water level detection circuit, have circuit board in above-mentioned catheter interior and by first electrode and second being integrated in
In condenser type water level detection circuit of the variable quantity of electrode detection capacitor to measure water level, comprising: detection circuit portion, including have
The capacitor of a certain size capacitor, and more above-mentioned capacitor capacitor and measured by above-mentioned first electrode and second electrode
Capacitor to export the first control unit of high (High) signal and low (Low) signal, when multiple communication port are respectively connected with
Clock line and data line；Delay circuit portion, it is in parallel with above-mentioned first control unit by above-mentioned clock line and data line, and according to upper
The output signal delay certain time for stating first control unit exports high RST or low signal later；And output circuit portion, according to
High RST or low signal are worn output terminal outside Winter Solstice by the output signal in above-mentioned delay circuit portion, and are obtained and be used for circuit drives
DC voltage supply.
Here, above-mentioned delay circuit portion includes the single for being integrated with calculation processing circuit, input/output interface and memory
Second control unit of piece microprocessor form, and correction is stored in above-mentioned first control with program form in above-mentioned memory
The capacitance that unit processed measures adjusts the algorithm of measurement sensitivity.
In addition, above-mentioned output circuit portion, it may include: the first triode of NPN type, the output with above-mentioned delay circuit portion
Port connects and exports high RST or low signal；Second triode of PNP type connects with the collector terminal of above-mentioned the first transistor
It connects and high RST or low signal is sent to external output terminal；The third transistor and resistance of PNP type, are respectively connected to above-mentioned
The base terminal of second triode and and emitter terminal, be formed together current limit circuit with above-mentioned second triode.
In addition, above-mentioned output circuit portion, it may include: the first triode of NPN type, the output with above-mentioned delay circuit portion
Port connects and high RST or low signal is sent to external output terminal；The second triode and resistance of NPN type, it is each to connect
In above-mentioned first triode base terminal and and emitter terminal, with above-mentioned first triode be formed together current limit electricity
Road.
Invention effect
The present invention of above-described embodiment prevents the unnecessary detection operation and flutter phenomenon to take place frequently, so that circuit operation is steady
It is fixed, improve the reliability of water level detecting.
Detailed description of the invention
Fig. 1 is the concept map for illustrating the condenser type water level detection gauge of the prior art；
Fig. 2 is the circuit diagram for indicating the condenser type water level detection circuit of the first embodiment of the present invention；
Fig. 3 is the circuit diagram for indicating the condenser type water level detection circuit of the second embodiment of the present invention；
Fig. 4 is the circuit diagram for indicating the condenser type water level detection circuit of the third embodiment of the present invention；
Fig. 5 is the circuit diagram for indicating the condenser type water level detection circuit of the fourth embodiment of the present invention；
Fig. 6 is the circuit diagram for indicating the equivalent circuit of current limit circuit of Fig. 4；
Fig. 7 is the circuit diagram for indicating the equivalent circuit of current limit circuit of Fig. 5.
Specific embodiment
In the following, present pre-ferred embodiments are described in detail in conjunction with attached drawing.In addition, being omitted or simplified to relevant art
The readily comprehensible structure of the technical staff in field and its functions and effects illustrate, and centered on part related to the present invention into
Detailed description is gone.
Especially, the condenser type water level monitoring circuit of the embodiment of the present invention is for including the sensing for forming first electrode
Device stick 20, and it is separated by the capacitor of the conduit 40 of the hollow tube form of a part formation second electrode of receiving the sensor stick 20
Premised on the condenser type water level detection circuit of water level detection gauge, and above-mentioned water level detection circuit has in above-mentioned conduit being integrated in
Circuit board inside 40 simultaneously detects the variable quantity of capacitor by first electrode and second electrode to measure water level.
As shown in Figures 2 to 5, the above-mentioned condenser type water level detection circuit of the invention for condenser type water level detection gauge is big
It causes to include detection circuit portion 200, delay circuit portion 400 and output circuit portion 600.
Firstly, above-mentioned detection circuit portion 200 includes the capacitor 210 for having a certain size capacitor, and more above-mentioned electricity
The capacitor of container 210 and by capacitor that above-mentioned first electrode and second electrode measure to export high (High) signal and low
(Low) first control unit 220 of signal.Multiple communication port are formed in above-mentioned first control unit 220 and are respectively connected with
Clock line 320 and data line 340.
Then, above-mentioned delay circuit portion 400 passes through above-mentioned clock line 320 and data line 340 and above-mentioned first control unit
220 is in parallel, and is postponed to export high RST or low letter after certain time according to the output signal of above-mentioned first control unit 220
Number.Above-mentioned delay circuit portion 400 passes through synchronous serial communication (Inter Integrated Circuit) mode and above-mentioned detection
Circuit portion 200 connects, and can pass through chain line, i.e. clock line (SCL:Serial Clock) and data line (SDA:Serial
Data half-duplex (half-duplex) communication) is realized.Because above-mentioned communication mode supports multi-control modes, therefore can be with N:N and more
A peripheral support circuit is communicated, the communication being suitable between multiple chips inside the circuit board such as the present embodiment.Especially
It is, according to simple circuit structure, needing to be simply integrated element and chip to the maximum extent in small circuit board
Feature of the invention is suitable for constituting simple circuit.
Above-mentioned delay circuit portion 400 is micro- by the single-chip for being integrated with calculation processing circuit, input/output interface and memory
Second control unit of processor form is constituted, and is stored with correction in above-mentioned first control with program form in above-mentioned memory
The capacitance that unit 220 processed measures adjusts the algorithm of measurement sensitivity.
Then, above-mentioned output circuit portion 600 is according to the output signal in above-mentioned delay circuit portion 400 by high RST or low signal
Output terminal outside Winter Solstice is worn, and obtains the supply of the DC voltage for circuit drives.
As shown in Figures 2 and 3, above-mentioned output circuit portion 600 may include chip form third control unit 620a,
620b, and PNP type and the implementation of NPN type can be divided into according to output port.
In addition, as shown in figure 4, above-mentioned output circuit portion, it may include: the first triode 621 of NPN type prolongs with above-mentioned
The output port of slow circuit portion 400 connects and exports high RST or low signal；Second triode 623 of PNP type, with above-mentioned
The collector terminal of one transistor 621 connects and high RST or low signal is sent to external output terminal；The three or three of PNP type
Pole pipe 625 and resistance 627, be respectively connected to above-mentioned second triode 623 base terminal and and emitter terminal, with above-mentioned second
Triode 623 is formed together current limit circuit CL1.Here, the equivalent circuit of above-mentioned current limit circuit CL1 can be such as Fig. 6 institute
Show.Above-mentioned current limit circuit, which plays, to be protected circuit and applies to input and output signal when overloading in the output signal
The effect of circuit is protected when back voltage.
In contrast, as shown in figure 5, above-mentioned output circuit portion 600, it may include: the first triode 643 of NPN type, with
The output port in above-mentioned delay circuit portion 400 connects and high RST or low signal is sent to external output terminal；NPN type
Second triode 645 and resistance 647, be respectively connected to above-mentioned first triode 643 base terminal and and emitter terminal, and it is upper
It states the first triode 643 and is formed together current limit circuit CL2.Here, the equivalent circuit of above-mentioned current limit circuit CL2 can be such as
Shown in Fig. 7.
In the embodiment of such as Fig. 4 and Fig. 5, output circuit portion 600 has other power circuit 660 and obtains for circuit
The supply of the DC voltage of driving, moreover, according to the capacitor detected in sensor rod 20 and conduit 40, capacitor in parallel
Quantity and circuit structure can change.
In the following, the technological maheup based on aforementioned present invention illustrates circuit according to various embodiments.
<first embodiment>
Fig. 2 is the circuit diagram for indicating the condenser type water level detection circuit of the first embodiment of the present invention.
If sensor rod 20 and conduit 40 are located at outside liquid water level, low signal is passed through work by first control unit 220
The port SCL and SDA for synchronous serial communication port is sent to the second control unit 420, and the second control unit 420 passes through output
Low signal is sent to third control unit 620a by port, and third control unit 620a exports low letter by PNP output port
Number and be sent to external output terminal (OUTPUT).
Therefore, it is changed according to the capacitor of the water level sensor stick 20 of liquid and conduit 40, then first control unit 220
It is compared with the capacitor of capacitor 210, and is less than capacitor in the capacitor measured by the sensor stick 20 and conduit 40
When 210 capacitor, first control unit 220 maintains low signal output, and when becoming larger than the capacitor of above-mentioned capacitor 210,
First control unit 220 exports high RST and is sent to the second control unit 420, and the second control unit 420 is in one timing of delay
Between after, output high RST is simultaneously sent to third control unit 620a, and third control unit 620a exports high RST.
I.e. when sensor rod 20 and conduit 40 are submerged among liquid, then because the capacitor that sensor rod 20 detects becomes big
In the capacitor of capacitor 210, the second control unit 420 exports high RST after postponing certain time.
In contrast, when sensor rod 20 and conduit 40 become the state not being submerged among liquid, then because of sensor rod
20 capacitors detected become smaller than the capacitor of capacitor 210, and the second control unit 420 exports low after postponing certain time
Signal.
<second embodiment>
Fig. 3 is the circuit diagram for indicating the condenser type water level detection circuit of the second embodiment of the present invention.
Second embodiment because the output port of third control unit 620b is NPN type, with above explained the
One embodiment there was only output signal on the contrary, and remaining structure is identical or extremely similar, therefore, details are not described herein.
<3rd embodiment>
Fig. 4 is the circuit diagram for indicating the condenser type water level detection circuit of the third embodiment of the present invention.
If sensor rod 20 and conduit 40 are located at outside liquid water level, low signal is passed through work by first control unit 220
The port SCL and SDA for synchronous serial communication port is sent to the second control unit 420, the low signal of the second control unit 420
It exports to the base terminal of the first triode 621 of NPN type, and the collector terminal of above-mentioned first triode 621 is with high state
Apply the base terminal of the second triode 623 of PNP type, the emitter terminal of above-mentioned second triode 623 exports low signal.
It is changed according to the capacitor of the water level sensor stick 20 of liquid and conduit 40, then first control unit 220 and electricity
The capacitor of container 210 is compared, and is less than capacitor 210 in the capacitor measured by the sensor stick 20 and conduit 40
When capacitor, the low signal of first control unit 220 is input to the base terminal of the first triode 621 of NPN type, thus because of collection
The high RST output of extreme son can not drive the base stage of the second triode 623 of output of PNP type, therefore, emitter terminal
Maintain low state, and when sensor rod 20 and conduit 40 are submerged among liquid, then the electricity detected because passing through sensor rod 20
Hold the capacitor for being greater than capacitor 210, first control unit 220 exports high RST and is sent to the second control unit 420, the second control
Unit 420 processed exports high RST and is applied to the base stage of the first control unit 621 of NPN type after postponing certain time
Terminal makes the low signal of collector terminal drive the base stage of the second triode 623 of output of PNP type, emitter terminal output
High RST.
I.e. when sensor rod 20 and conduit 40 are submerged among liquid, because the capacitor that sensor rod 20 detects is greater than capacitor
The capacitor of device 210, the second control unit 420 export high RST after postponing certain time and are applied to the first of NPN type
The base terminal of triode 621, to make the emitter terminal output high RST of the second triode 623 of output of PNP type.
In contrast, when sensor rod 20 and conduit 40 are in the state not being submerged among liquid, because of sensor rod 20
The capacitor detected is less than the capacitor of capacitor 210, and the second control unit 420 exports low signal simultaneously after postponing certain time
It is applied to the base terminal of the first triode 621 of NPN type, to make the hair of the second triode 623 of output of PNP type
Emitter-base bandgap grading end exports low signal.
<fourth embodiment>
Fig. 5 is the circuit diagram for indicating the condenser type water level detection circuit of the fourth embodiment of the present invention.
Fourth embodiment because the output first control unit 643 of output circuit 640 is NPN type, and it is above-mentioned
The 3rd embodiment of explanation there was only output signal on the contrary, and remaining structure is identical or extremely similar, it is therefore, no longer superfluous herein
It states.
According to condenser type water level detection circuit present invention as described above, make the electricity detected from sensor rod and conduit
The variation of appearance exports after postponing certain time, prevents unnecessary frequent detection operation and flutter phenomenon, therefore, circuit
It is stable, improve the reliability of water level detecting.
For facilitate a better understanding of will aftermentioned claims of the present invention, the present invention is widely described in detail in above content
The characteristics of and technical characteristic.Above-described embodiment is only to illustrate the present invention rather than limits, and those skilled in the art should
Understand, can modify, deform or equivalent replacement to the present invention.And do not departing within the spirit and scope of the present invention,
It is intended to be within the scope of the claims of the invention.
Industrial applicibility
The present invention relates to condenser type water level detection circuit, it is used especially for using the part being submerged in liquid and is not flooded
The condenser type water level detection circuit field of capacitance difference sensed water level between part not.
Claims (4)
1. a kind of form the sensor rod of first electrode for including, and it is separated by a part of receiving the sensor stick and forms the
The condenser type water level detection circuit of the capacitor water level detection gauge of the conduit of the hollow tube form of two electrodes, has being integrated in
The circuit board of above-mentioned catheter interior simultaneously detects the variable quantity of capacitor by first electrode and second electrode to measure the capacitor of water level
In formula water level detection circuit, comprising: detection circuit portion, including having the capacitor of a certain size capacitor, and more above-mentioned electricity
The capacitor of container and believed by capacitor that above-mentioned first electrode and second electrode measure with exporting high (High) signal and low (Low)
Number first control unit, be respectively connected with clock line and data line in multiple communication port；Delay circuit portion passes through above-mentioned clock
Line and data line are in parallel with above-mentioned first control unit, and postpone certain time according to the output signal of above-mentioned first control unit
High RST or low signal are exported later；And output circuit portion, according to the output signal in above-mentioned delay circuit portion by high RST or low
Signal wears output terminal outside Winter Solstice, and obtains the supply of the DC voltage for circuit drives.
2. condenser type water level detection circuit according to claim 1, it is characterised in that:
Above-mentioned delay circuit portion includes the one-chip microcomputer for being integrated with calculation processing circuit, input/output interface and memory
Second control unit of form, and correction is stored with program form in above-mentioned memory and is measured in above-mentioned first control unit
Capacitance adjust measurement sensitivity algorithm.
3. condenser type water level detection circuit according to claim 1, it is characterised in that:
Above-mentioned output circuit portion, it may include: the first triode of NPN type is connect with the output port in above-mentioned delay circuit portion
And export high RST or low signal；Second triode of PNP type connect and is incited somebody to action with the collector terminal of above-mentioned first triode
High RST or low signal are sent to external output terminal；The third transistor and resistance of PNP type, are respectively connected to the above-mentioned 2nd 3
The base terminal of pole pipe and and emitter terminal, be formed together current limit circuit with above-mentioned second triode.
4. condenser type water level detection circuit according to claim 1, it is characterised in that:
Above-mentioned output circuit portion, it may include: the first triode of NPN type is connect with the output port in above-mentioned delay circuit portion
And high RST or low signal are sent to external output terminal；The second triode and resistance of NPN type are respectively connected to above-mentioned
The base terminal of one triode and and emitter terminal, be formed together current limit circuit with above-mentioned first triode.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2014-0033409 | 2014-03-21 | ||
| KR1020140033409A KR101414199B1 (en) | 2014-03-21 | 2014-03-21 | Level detecting circuit of Electrostatic capacitance type |
| PCT/KR2015/002833 WO2015142144A1 (en) | 2014-03-21 | 2015-03-23 | Capacitive level sensor circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106104225A CN106104225A (en) | 2016-11-09 |
| CN106104225B true CN106104225B (en) | 2019-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201580014885.3A Active CN106104225B (en) | 2014-03-21 | 2015-03-23 | Condenser type water level detection circuit |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR101414199B1 (en) |
| CN (1) | CN106104225B (en) |
| WO (1) | WO2015142144A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110831890B (en) * | 2017-05-03 | 2022-02-25 | 耐普罗公司 | Apparatus, system and method for providing a liquid level monitor |
| KR101984636B1 (en) | 2017-05-29 | 2019-05-31 | (주) 래트론 | Optical water level sensor integrated with case and prism |
| KR102112449B1 (en) * | 2019-06-16 | 2020-05-18 | 주식회사 에프램 | A Capacitive Water Level Sensor |
| WO2021087220A1 (en) * | 2019-10-31 | 2021-05-06 | KSR IP Holdings, LLC | Sensing systems using current steering bridges |
| CN115301388B (en) * | 2022-07-25 | 2024-02-23 | 珠海格力电器股份有限公司 | Garbage disposal device, garbage disposal method, and garbage disposal control apparatus |
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| JPS59187225A (en) * | 1983-04-06 | 1984-10-24 | Kanbayashi Seisakusho:Kk | Water level informing apparatus for bath tub |
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| KR890004951B1 (en) * | 1987-04-11 | 1989-12-02 | 재단법인 한국전자 통신연구소 | Water level detective circuit |
| KR920008287A (en) * | 1990-10-29 | 1992-05-27 | 김대산 | BIDET attached to the toilet |
| US20040059508A1 (en) * | 2002-09-09 | 2004-03-25 | Champion James Robert | Measuring distances using multistatic probes |
| US20040149032A1 (en) * | 2003-01-31 | 2004-08-05 | Sell Jeffrey A | Liquid level sensor |
-
2014
- 2014-03-21 KR KR1020140033409A patent/KR101414199B1/en active IP Right Grant
-
2015
- 2015-03-23 WO PCT/KR2015/002833 patent/WO2015142144A1/en active Application Filing
- 2015-03-23 CN CN201580014885.3A patent/CN106104225B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59187225A (en) * | 1983-04-06 | 1984-10-24 | Kanbayashi Seisakusho:Kk | Water level informing apparatus for bath tub |
| JPH08327434A (en) * | 1995-05-29 | 1996-12-13 | Kuramo Denko Kk | Water-level detection apparatus |
| CN201697690U (en) * | 2009-07-31 | 2011-01-05 | 佛山市中协电器有限公司 | Capacitive sensing liquid level sensor |
| CN202433055U (en) * | 2011-12-20 | 2012-09-12 | 信息产业部电子第四十研究所华成高新技术公司 | Water level sensor |
| CN103023472A (en) * | 2012-12-10 | 2013-04-03 | 烟台荏原空调设备有限公司 | Special liquid level relay for lithium bromide solution |
| CN103256964A (en) * | 2013-04-16 | 2013-08-21 | 周德海 | Capacitor liquid level measuring device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106104225A (en) | 2016-11-09 |
| KR101414199B1 (en) | 2014-07-01 |
| WO2015142144A1 (en) | 2015-09-24 |
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