CN105784056B - Current control circuit and electrode level monitoring device - Google Patents
Current control circuit and electrode level monitoring device Download PDFInfo
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- CN105784056B CN105784056B CN201610121035.XA CN201610121035A CN105784056B CN 105784056 B CN105784056 B CN 105784056B CN 201610121035 A CN201610121035 A CN 201610121035A CN 105784056 B CN105784056 B CN 105784056B
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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
Abstract
The present invention relates to a kind of current control circuit and electrode level monitoring device, current control circuit includes: triode Q1, Q2, Q3 and Q4, control circuit；Control circuit is to set period output waveform opposite the first pulse signal and the second pulse signal；Source electrode s1, s2 of described triode Q1, Q3 are connected, and access operating current；Grid g1, g2 of described triode Q1, Q2 are connected, and access the first pulse signal；Grid g3, g4 of described triode Q3, Q4 are connected, and access the second pulse signal；The drain electrode d1 of the triode Q1 is connected with the drain electrode d2 of Q2, and connects first electrode；The drain electrode d3 of the triode Q3 is connected with the drain electrode d4 of Q4, and connects second electrode；The source electrode s4 of the source electrode s2 and Q4 of the triode Q2 are connected, and connect ground.Technology of the invention, avoiding long-term alternating voltage leads to the oxidation and rusting or absorption liquid impurity of electrode, it is ensured that the electric conductivity of electrode is reduced to liquid level false judgment, improves monitoring accuracy.
Description
Technical field
The present invention relates to electrode level monitoring technical fields, supervise more particularly to a kind of current control circuit and electrode level
Survey device.
Background technique
Water level switch is the switch for controlling liquid level, is formally broadly divided into contact and contactless.Wherein connect
The float type level switch of touch is most widely used.In many industrial processes, water level switch is typically used to judge liquid
Body state, measurement liquid height, volume etc., such as in recent years, as the in short supply and market of water resource is to household appliances section
The raising that energy, environmental-protecting performance require, for example, Europe, north America region come into legislative procedure for household appliances water saving index,
Good water-saving performance has become the important technology development trend of New Generation of Intelligent, green washing machine.Water-saving technology core
The heart is the water that accurately control in laundry machine barrel, is also implied that firstly the need of accurately measuring liquid level.
Electric pole type liquid-level switch is currently on the market generally using one of technology, and this switch is the electric conductivity using liquid
Detect the height of liquid level, the substance in tub once touches electrode, will it is conductive thus detecting signal.The signal of via controller
Output realizes the control to liquid level to handling after amplification.This electrode liquid-level switch is suitable for the liquid level of any conducting liquid, tool
There is surge protection function, surging can be effectively prevent to interfere.Multiparty control can be done.
But work as reality during use, there are a disadvantages for this switch, apply alternating current on two electrodes for a long time
Pressure is easy so that anodizing is got rusty or adsorbed a large amount of impurity in liquid, causes electrode cannot conductive or electrically conductive signal
Intermittently phenomena such as, occurs, and reduces the accuracy to liquid level monitoring.
Summary of the invention
Based on this, it is necessary in view of the above technical problems, a kind of current control circuit and electrode level monitoring device are provided,
The oxidation and absorption of electrode are reduced, detection monitoring accuracy is improved.
A kind of current control circuit, comprising: triode Q1, Q2, Q3 and Q4, control circuit；
The control circuit is to set period output waveform opposite the first pulse signal and the second pulse signal；
Source electrode s1, s2 of described triode Q1, Q3 are connected, and access operating current；
Grid g1, g2 of described triode Q1, Q2 are connected, and access the first pulse signal；Described triode Q3, Q4's
Grid g3, g4 are connected, and access the second pulse signal；
The drain electrode d1 of the triode Q1 is connected with the drain electrode d2 of Q2, and connects first electrode；The triode Q3's
Drain electrode d3 is connected with the drain electrode d4 of Q4, and connects second electrode；
The source electrode s4 of the source electrode s2 and Q4 of the triode Q2 are connected, and connect ground.
A kind of electrode level monitoring device, including processor and electrode, which is characterized in that further include such as above-mentioned electric current control
Circuit processed.
Above-mentioned current control circuit and electrode level monitoring device, by triode Q1, Q2, Q3 and Q4, in conjunction with two electricity
Pole forms AC bridge, the time that control circuit is connected with periodically pulsing signal control AC bridge, makes electric current electric from two
It flows back on extremely dynamic, avoiding long-term alternating voltage leads to the oxidation and rusting or absorption liquid impurity of electrode, it is ensured that electricity
The electric conductivity of pole is reduced to liquid level false judgment, improves monitoring accuracy.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of current control circuit；
Fig. 2 is the structural schematic diagram of the current control circuit of preferred embodiment.
Specific embodiment
Refering to what is shown in Fig. 1, Fig. 1 is the structural schematic diagram of current control circuit, comprising: triode Q1, Q2, Q3 and Q4, control
Circuit processed；
The control circuit is to set the first opposite pulse signal Control 1 of period output waveform and the second pulse letter
Number Control 2；
Source electrode s1, s2 of described triode Q1, Q3 are connected, and access operating current IN；
Grid g1, g2 of described triode Q1, Q2 are connected, and access the first pulse signal Control 1；Three pole
Grid g3, g4 of pipe Q3, Q4 are connected, and access the second pulse signal Control 2；
The drain electrode d1 of the triode Q1 is connected with the drain electrode d2 of Q2, and connects first electrode PoleA；The triode
The drain electrode d3 of Q3 is connected with the drain electrode d4 of Q4, and connects second electrode PoleB；
The source electrode s4 of the source electrode s2 and Q4 of the triode Q2 are connected, and connect ground.
The current control circuit of above-described embodiment forms exchange in conjunction with two electrodes by triode Q1, Q2, Q3 and Q4
Electric bridge, allows electric current to flow back from two electrodes at the time that control circuit is connected with periodically pulsing signal control AC bridge
It is dynamic, avoid the impurity that anodizing is got rusty or adsorbed in liquid, it is ensured that the electric conductivity of electrode is reduced to liquid level mistake
Judgement improves monitoring accuracy.
As one embodiment, the current control circuit working principle be can be such that
After first electrode PoleA and second electrode PoleB contact liq are powered, operating current I is generatedN；Wherein, the electricity
Stream is detected by processor, for judging liquid level；
When the first pulse signal is high level and the second pulse signal is low level, electric current pass sequentially through triode Q1,
First electrode PoleA, second electrode PoleB and triode Q4 flow direction ground connection；When the first pulse signal is low level and the second arteries and veins
Rush signal be high level when, electric current pass sequentially through triode Q3, second electrode PoleB, first electrode PoleA and triode Q2 stream
To ground connection.
In the present embodiment, described triode Q1, Q3 can use the enhanced field effect transistor of N-channel；Three pole
Pipe Q2, Q4 can use P-channel enhancement type field effect transistor.It using field-effect tube, is controlled by voltage, energy consumption is lower.
Preferably, described triode Q1, Q3 can use FDN304P field effect transistor；Described triode Q2, Q4 can be with
Using 2N7002 field effect transistor.It is durable, at low cost using above-mentioned field-effect tube.
Refering to what is shown in Fig. 2, Fig. 2 is the structural schematic diagram of the current control circuit of preferred embodiment.
As one embodiment, the control circuit includes photo-coupler, triode Q5；The anode of the photo-coupler is 1.
By resistance R2 connection DC voltage Vdd (desirable 3.3V), 2. cathode accesses the pulse signal Control in setting period, current collection
3. pole exports the first pulse signal Control 1,4. emitter is grounded；The base stage b5 of the triode Q5 passes through resistance R4, R3
Operating voltage is connected, collector c5 exports the second pulse signal Control 2 and by resistance R5 connection working power VDD, hair
Emitter-base bandgap grading e5 ground connection.
Preferably, the resistance R2 resistance value is 560 Ω, and the resistance R3 resistance value is 1K Ω, and the resistance R4 resistance value is
6.2K Ω, the resistance R5 resistance value are 1K Ω.
The control circuit of above-described embodiment is generated by simple circuit structure using the pulse signal Control of input
Opposite pulse signal Control 1 and pulse signal Control 2.
As shown in Fig. 2, the current control circuit can also include triode Q6 as one embodiment；Three pole
The base stage b6 of pipe Q6 passes through source electrode s1, s2 of resistance R1 (resistance value can use 1K Ω) described triode Q1, Q3, collector c6 connection work
Make power vd D (can power using 5V.DC), emitter e 6 connects processor CPU.
The current control circuit of above-described embodiment, after first electrode PoleA and second electrode PoleB contact liq are powered
Generate operating current IN, electric current INI is enlarged by triode Q6 to be detected by processor CPU.
Refering to what is shown in Fig. 2, electrode level monitoring device provided by the invention, including processor CPU and electrode (first electrode
PoleA and second electrode PoleB) and any of the above-described embodiment in the current control circuit that proposes.
By above-mentioned current control circuit, at work, electric current flows back dynamic from two electrodes, and it is raw to avoid anodizing
Impurity in rust or absorption liquid, it is ensured that the electric conductivity of electrode reduces to liquid level false judgment, it is accurate to improve monitoring
Property.
Preferably, electrode tip A, B of the first electrode PoleA and second electrode PoleB can use Φ 4mm stainless steel
304 production, two electrodes are attached with current control circuit by conducting wire resistant to high temperature.
Prolonged exchange conducting and judgement, the direct current for being changed to pulsed are turned AC bridge by technical solution of the present invention
Channel and monitoring, effectively reduce the oxidation and absorption of electrode, improve service life and the stable type of water level switch, reduce production
The power consumption of product.And structure is simple, saves a large amount of space for water circuit system, reduces the difficulty of water circuit system design.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (8)
1. a kind of current control circuit characterized by comprising triode Q1, Q2, Q3 and Q4, control circuit；
The control circuit is to set period output waveform opposite the first pulse signal and the second pulse signal；
Source electrode s1, s2 of described triode Q1, Q3 are connected, and access operating current；
Grid g1, g2 of described triode Q1, Q2 are connected, and access the first pulse signal；The grid of described triode Q3, Q4
G3, g4 are connected, and access the second pulse signal；
The drain electrode d1 of the triode Q1 is connected with the drain electrode d2 of triode Q2, and connects first electrode；The triode Q3
Drain electrode d3 be connected with the drain electrode d4 of triode Q4, and connect second electrode；
The source electrode s4 of the source electrode s2 and triode Q4 of the triode Q2 are connected, and connect ground；
The control circuit includes: photo-coupler, triode Q5；
The anode of the photo-coupler passes through resistance R2 connection DC voltage, the pulse signal in cathode access setting period, current collection
Pole exports the first pulse signal, emitter ground connection；
The base stage of the triode Q5 connects operating voltage by resistance R4, R3, and collector exports the second pulse signal and passes through
Resistance R5 connection working power, emitter ground connection；
After first electrode and second electrode contact liq are powered；
When the first pulse signal is high level and the second pulse signal is low level, electric current passes sequentially through triode Q1, first
Electrode, second electrode and triode Q4 flow direction ground connection；
When the first pulse signal is low level and the second pulse signal is high level, electric current passes sequentially through triode Q3, second
Electrode, first electrode and triode Q2 flow direction ground connection.
2. current control circuit according to claim 1, which is characterized in that further include triode Q6；
For the base stage of the triode Q6 by source electrode s1, s2 of triode Q1, Q3 described in resistance R1, it is electric that collector connects work
Source, emitter connect processor.
3. current control circuit according to claim 1, which is characterized in that described triode Q1, Q3 are that N-channel is enhanced
Field effect transistor；Described triode Q2, Q4 are P-channel enhancement type field effect transistor.
4. current control circuit according to claim 3, which is characterized in that described triode Q1, Q3 are FDN304P effects
Answer triode；Described triode Q2, Q4 are 2N7002 field effect transistor.
5. current control circuit according to claim 1, which is characterized in that the resistance R2 resistance value is 560 Ω, the electricity
Resistance R3 resistance value is 1K Ω, and the resistance R4 resistance value is 6.2K Ω, and the resistance R5 resistance value is 1K Ω.
6. current control circuit according to claim 2, which is characterized in that the resistance R1 resistance value is 1K Ω.
7. a kind of electrode level monitoring device, including processor and first electrode, second electrode, which is characterized in that further include as
Current control circuit as claimed in any one of claims 1 to 6.
8. electrode level monitoring device according to claim 7, which is characterized in that the first electrode and second electrode
Electrode tip is made of Φ 4mm stainless steel 304, and two electrodes are attached with current control circuit by conducting wire resistant to high temperature.
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| CN201610121035.XA CN105784056B (en) | 2016-03-03 | 2016-03-03 | Current control circuit and electrode level monitoring device |
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| CN201610121035.XA CN105784056B (en) | 2016-03-03 | 2016-03-03 | Current control circuit and electrode level monitoring device |
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| CN105784056B true CN105784056B (en) | 2019-06-07 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110346015A (en) * | 2019-08-05 | 2019-10-18 | 杭州微联智控科技有限公司 | Electric pole type water logging detection circuit and water sensor |
| CN114916830A (en) * | 2022-04-13 | 2022-08-19 | 广东智科电子股份有限公司 | Control circuit and control method for water heater |
| 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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| CN101464177A (en) * | 2009-01-12 | 2009-06-24 | 郑贵林 | Liquid level detection type self-calibration high-precision water gauge |
| CN104767503A (en) * | 2015-04-23 | 2015-07-08 | 江苏博克斯自动化控制工程有限公司 | Ultrasonic wave controllable pulse wave-making drive circuit and drive method thereof |
| CN205506167U (en) * | 2016-03-03 | 2016-08-24 | 广州赛宝仪器设备有限公司 | Current control circuit and electrode water level monitoring device |
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| JPH09257546A (en) * | 1996-03-26 | 1997-10-03 | Brother Ind Ltd | Residual detecting device |
| JP2001272264A (en) * | 2000-03-27 | 2001-10-05 | Toto Ltd | Water detector |
| JP5013089B2 (en) * | 2007-09-07 | 2012-08-29 | 株式会社富士通ゼネラル | Liquid level detector |
| CN101995283A (en) * | 2009-08-12 | 2011-03-30 | 中国船舶重工集团公司第七一九研究所 | Time division multiplexing multi-channel electric contact liquid level detection circuit |
| CN201852615U (en) * | 2010-08-24 | 2011-06-01 | 陈业斌 | Alternating current electrolytic liquid level sensor |
| CN203893911U (en) * | 2014-06-26 | 2014-10-22 | 广东瑞德智能科技股份有限公司 | Water level detection circuit |
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| CN101464177A (en) * | 2009-01-12 | 2009-06-24 | 郑贵林 | Liquid level detection type self-calibration high-precision water gauge |
| CN104767503A (en) * | 2015-04-23 | 2015-07-08 | 江苏博克斯自动化控制工程有限公司 | Ultrasonic wave controllable pulse wave-making drive circuit and drive method thereof |
| CN205506167U (en) * | 2016-03-03 | 2016-08-24 | 广州赛宝仪器设备有限公司 | Current control circuit and electrode water level monitoring device |
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Effective date of registration: 20201110 Address after: 511300 No.78, west of Zhucun Avenue, Zhucun street, Zengcheng District, Guangzhou City, Guangdong Province Patentee after: CHINA ELECTRONIC PRODUCT RELIABILITY AND ENVIRONMENTAL TESTING Research Institute (THE FIFTH ELECTRONIC Research Institute OF MIIT)(CEPREI LABORATORY)) Address before: 510610 No. 110 Zhuang Road, Tianhe District, Guangdong, Guangzhou, Dongguan Patentee before: GUANGZHOU CEPREI INSTRUMENT AND EQUIPMENT Co.,Ltd. |