CN206362411U - A kind of liquid level detects circuit - Google Patents
A kind of liquid level detects circuit Download PDFInfo
- Publication number
- CN206362411U CN206362411U CN201720018629.8U CN201720018629U CN206362411U CN 206362411 U CN206362411 U CN 206362411U CN 201720018629 U CN201720018629 U CN 201720018629U CN 206362411 U CN206362411 U CN 206362411U
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- pwm
- signal
- circuit
- electrode
- liquid level
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Circuit is detected the utility model discloses a kind of liquid level based on PWM technologies, circuit occurs for its PWM for including being used to produce the pwm signal that dutycycle is 50%, PWM amplification circuit of electrical signal for amplifying PWM voltage signals, the PWM output signal termination electrode P being connected with PWM amplification circuit of electrical signalCOM, several PWM receive signal termination electrode PNRectification circuit for the PWM electric signals of reception being converted into direct current signal, for not reaching arrival water level and the signal processing circuit that the corresponding analog voltage signal of water level is changed into the recognizable binary code data signal of computer, several PWM receive signal termination electrode PNDifferent height in tested container.The utility model is simple in construction, can effectively, in real time, accurately measure liquid level signal, can prevent electrode for a long time be corroded in a liquid or electrode fouling.
Description
Technical field
The utility model belongs to electronic measuring technology field, and in particular to a kind of liquid level detects circuit.
Background technology
Liquid level gauge is a kind of important measuring instrumentss, and indispensable effect is played in industrial circles such as oil, chemical industry,
Wherein, electrode-type liquid-level meter judges liquid level depth by the electrode being in contact with liquid.With conventional float technique, pressure differential method,
The liquid-level detecting methods such as ultrasonic wave are compared, the characteristics of electrode-type liquid-level meter has simple and practical, and its measurement time delay is small, structure is simple
It is single, it is widely used in level monitoring system, is a kind of simple and reliable liquid level monitor.
Electrode-type liquid-level meter typically uses DC level as one end of electrode, when electrode conduction DC voltage can make liquid
In negative ions ionize out, two problems are found in actual use：（1）If liquid produce containing calcium ion,
Chlorion plasma, is easy for the materials such as congregation hydrate, carbonate compound, and the solubization of carbonate compound is low, many
With regard to deposit buildup on powered electrode, surface scale often occurs on electrode tip when also having in liquid, whole electrode is covered
End, causes electrode to be opened a way, liquid level monitoring failure；（2）If the ion of ionization out has corrosivity, ion is gathered in two electricity
Around pole, electrode can be corroded quickly, also result in detection failure.
Utility model content
In order to overcome above-mentioned technical problem, the utility model provides a kind of liquid level and detects circuit.
The technical scheme that the utility model is used to achieve the above object is：A kind of liquid level detects circuit, and it is wrapped
Include and occur circuit for producing the PWM for the pwm signal that dutycycle is 50%, the PWM electric signals for amplifying PWM voltage signals are put
Big circuit, the PWM output signal termination electrode P being connected with PWM amplification circuit of electrical signalCOM, several PWM receive signal termination electrode
PN, the rectification circuit for the PWM electric signals of reception being converted into direct current signal, for not reaching arrival water level and water level pair
The analog voltage signal answered is changed into the signal processing circuit of the recognizable binary code data signal of computer, it is described several
PWM receives signal termination electrode PNDifferent height in tested container.
Relative to prior art, the beneficial effects of the utility model：
1）It is simple in construction, can effectively, in real time, accurately measure liquid level signal.
2）Electrode can be prevented to be corroded in a liquid or electrode fouling for a long time.
Brief description of the drawings
Fig. 1 is the structural schematic block diagram that a kind of liquid level of the utility model detects circuit.
Fig. 2 is that circuit theory diagrams occur for PWM of the present utility model.
Fig. 3 is PWM amplification circuit of electrical signal schematic diagram of the present utility model.
Fig. 4 is PWM rectification circuits schematic diagram of the present utility model.
Embodiment
In order that the purpose of this utility model, technical scheme and its technique effect become apparent from, below in conjunction with accompanying drawing and tool
Body embodiment, the utility model is further elaborated.It should be appreciated that the specific reality described in this specification
Apply mode to explain the utility model, be not intended to limit the utility model.
Fig. 1 is the structural schematic block diagram that a kind of liquid level of the utility model detects circuit.The utility model provides one
Liquid level detection circuit is planted, circuit occurs for its PWM for including being used to produce the pwm signal that dutycycle is 50%, for amplifying
The PWM amplification circuit of electrical signal of PWM voltage signals, the PWM output signal termination electrode P being connected with PWM amplification circuit of electrical signalCOM,
Several PWM receive signal termination electrode PN, the rectification circuit for the PWM electric signals of reception being converted into direct current signal is used for
Do not reach arrival water level and the corresponding analog voltage signal of water level and be changed into the recognizable binary code data signal of computer
Signal processing circuit, several PWM receive signal termination electrode PNDifferent height in tested container.
The utility model is the height that liquid level is detected using the electric conductivity of liquid, it is adaptable to any conducting liquid liquid level it
Between.Electrode composition water level transmitter in liquid level container, when electrode is flooded by conducting liquid, is turned between two electrode tips,
Corresponding liquid level signal reacts the height of liquid level position.The utility model is equipped with a PWM output signal end PCOM, it is multiple to receive
Signal electrode end P1, P2... ..., PN, it is multiple to receive the different height that signal electrode end is fixed in tested container, you can to examine
Survey corresponding multiple liquid levels.
Fig. 2 is that circuit theory diagrams occur for PWM of the present utility model.In order to prevent the various ions for ionizing out in liquid rotten
Erosion electrode makes electrode fouling, and the utility model produces the signal of dutycycle 50% using PWM technologies.Work as by experimental verification and adopt
PWM output signal end P is used as with the signal of dutycycle 50%COMWhen, it can effectively suppress electrode fouling and electrode corrosion phenomenon.
In Fig. 2, in order to produce the pwm signal circuit that dutycycle is 50%, 555 chips can be used, pass through peripheral resistance R1、R2、C1、C2
With diode D1Generation oscillating circuit, voltage source VCC=5V of 555 chips, by taking the aqueous solution as an example, the conductance of water is relatively low, uses
+ 5V pwm signal is detected that signal intensity is too weak, and error signal occurs in easily detection, so 555 chips export OPWMCan not
As detecting electrode, it is necessary to be amplified.
Fig. 3 is amplifying circuit schematic diagram, and cascode collection amplifying circuit that the utility model is constituted using NPN transistor amplifies
OPWM, output+12V pwm signal is defined as electrode PCOM。
Fig. 4 is rectification circuit schematic diagram, for the PWM electric signals received to be converted into direct current signal, with P1One electricity
Extremely example, when liquid level does not reach PCOMAnd P1During two electrodes, with P1Connected triode T2Basis set does not have electric current, three
Pole pipe is not turned on, and VCC passes through R5、R6To electric capacity C3Charging, capacitance cathode point OD1Current potential is+5V；When simultaneously liquid level is reached
PCOMAnd P1During two electrodes, triode T2Conducting, corresponding liquid level signal reacts the height of liquid level position.
It is described in detail with reference to more than to of the present utility model as can be seen that relative to prior art, the utility model is at least
With following advantageous effects：
1）Measure time delay small, simple in construction, can effectively, it is real-time, accurately measure liquid level signal.
2）Electrode can be prevented to be corroded in a liquid or electrode fouling for a long time.
According to above-mentioned principle, the utility model can also carry out appropriate change and modification to above-mentioned embodiment.Therefore,
The utility model is not limited to embodiment disclosed and described above, to some modifications and changes of the present utility model
It should also be as falling into scope of the claims of the present utility model.Although in addition, having used some specific in this specification
Term, but these terms are merely for convenience of description, do not constitute any limitation to the utility model.
Claims (1)
1. a kind of liquid level detects circuit, it is characterised in that：Including the PWM hairs for producing the pwm signal that dutycycle is 50%
Raw circuit, the PWM amplification circuit of electrical signal for amplifying PWM voltage signals, the PWM being connected with PWM amplification circuit of electrical signal is defeated
Go out signal termination electrode PCOM, several PWM receive signal termination electrode PN, for the PWM electric signals of reception to be converted into direct current signal
Rectification circuit, for not reaching arrival water level and the corresponding analog voltage signal of water level and being changed into recognizable two of computer
The signal processing circuit of ary codes data signal, several described PWM receive signal termination electrode PNIn tested container
Different height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720018629.8U CN206362411U (en) | 2017-01-09 | 2017-01-09 | A kind of liquid level detects circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720018629.8U CN206362411U (en) | 2017-01-09 | 2017-01-09 | A kind of liquid level detects circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206362411U true CN206362411U (en) | 2017-07-28 |
Family
ID=59380283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720018629.8U Expired - Fee Related CN206362411U (en) | 2017-01-09 | 2017-01-09 | A kind of liquid level detects circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206362411U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109839168A (en) * | 2017-11-27 | 2019-06-04 | 佛山市顺德区美的饮水机制造有限公司 | The method and system of water level detection circuit, water level detecting |
| CN110736519A (en) * | 2019-11-28 | 2020-01-31 | 珠海格力电器股份有限公司 | Liquid level detection method, liquid level detection device and household appliance |
| CN111750953A (en) * | 2019-03-28 | 2020-10-09 | 佛山市顺德区美的饮水机制造有限公司 | Liquid level detection circuit and electric appliance |
| CN111982237A (en) * | 2020-08-06 | 2020-11-24 | 吴雪红 | Method for measuring liquid level of conductive liquid, liquid level sensor hydroelectric device and beverage machine |
| CN112344838A (en) * | 2019-08-07 | 2021-02-09 | 阿自倍尔株式会社 | Displacement output device and electric actuator |
| CN114754837A (en) * | 2022-03-22 | 2022-07-15 | 创升益世(东莞)智能自控有限公司 | Device and method for detecting filtrate amount of drilling fluid |
| CN115615515A (en) * | 2022-12-19 | 2023-01-17 | 河北卧牛净水设备有限公司 | Water dispenser control system and water dispenser |
-
2017
- 2017-01-09 CN CN201720018629.8U patent/CN206362411U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109839168A (en) * | 2017-11-27 | 2019-06-04 | 佛山市顺德区美的饮水机制造有限公司 | The method and system of water level detection circuit, water level detecting |
| CN111750953A (en) * | 2019-03-28 | 2020-10-09 | 佛山市顺德区美的饮水机制造有限公司 | Liquid level detection circuit and electric appliance |
| CN112344838A (en) * | 2019-08-07 | 2021-02-09 | 阿自倍尔株式会社 | Displacement output device and electric actuator |
| CN110736519A (en) * | 2019-11-28 | 2020-01-31 | 珠海格力电器股份有限公司 | Liquid level detection method, liquid level detection device and household appliance |
| CN111982237A (en) * | 2020-08-06 | 2020-11-24 | 吴雪红 | Method for measuring liquid level of conductive liquid, liquid level sensor hydroelectric device and beverage machine |
| CN114754837A (en) * | 2022-03-22 | 2022-07-15 | 创升益世(东莞)智能自控有限公司 | Device and method for detecting filtrate amount of drilling fluid |
| CN115615515A (en) * | 2022-12-19 | 2023-01-17 | 河北卧牛净水设备有限公司 | Water dispenser control system and water dispenser |
| CN115615515B (en) * | 2022-12-19 | 2023-03-10 | 河北卧牛净水设备有限公司 | Water dispenser control system and water dispenser |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170728 Termination date: 20220109 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |