CN205068033U - Detection control circuit of water level perception device - Google Patents
Detection control circuit of water level perception device Download PDFInfo
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- CN205068033U CN205068033U CN201520623865.3U CN201520623865U CN205068033U CN 205068033 U CN205068033 U CN 205068033U CN 201520623865 U CN201520623865 U CN 201520623865U CN 205068033 U CN205068033 U CN 205068033U
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Abstract
The application discloses detection control circuit of water level perception device, the circuit includes first power, connect in first power and have the AD mouth singlechip MCU, connect in water level perception device with divider resistance between the first power, and connect in water level perception device with voltage follower between singlechip MCU's the AD mouth. The detection of water level voltage that water level perception device produced can in real time, accurately be followed to the in -process of water level perception device perception water level, voltage follower to with the voltage signal that follows input MCU's AD mouth, realize that water level voltage acquires, and then can accurately judge the water level whether the basin water level reaches the settlement. It is thus clear that be different from prior art, the problem that ordinary IO mouth detection mode exists is overcome through AD mouth detection mode to this application, does not have voltage blind area problem, has improved sensitivity and reliability that the perception of dryer aqua storage tank water level detected, and has been applicable to different quality of water.
Description
Technical field
The application belongs to the technical field of circuit design of water level perception, detection, particularly relates to a kind of detection control circuit of water level sensing device.
Background technology
Current water level detecting and controlling circuit generally adopts IO (Input/Output, I/O) mouth detection mode, detects the water level perception situation of water tank of clothes dryer water level sensing device.With reference to figure 1, R1 is pull-up resistor, C1 is filter capacitor, R2 is current-limiting resistance, when water level sensing device CN1 perception is less than water, when namely the water level of aqua storage tank does not reach the rational height of CN1 detection terminal, then the water level detecting terminal of CN1 disconnects, now, the signal that MCU (MicroControlUnit, single-chip microcomputer) I/O port pin PUMP_CHECK detects is high level; When CN1 can perceive water, the water level detecting terminal of CN1 has been connected, then the high level of PUMP_CHECK is dragged down.
During MCU chip work, the high and low level of its I/O port can distinguish a corresponding corresponding level range, and to the magnitude of voltage be in outside its high and low level range, chip then accurately cannot detect its high and low level result, such as, be the chip of 5V for a certain operating voltage, suppose that its high and low level range is respectively: 3.75-5V, 0-1.5V, then for the voltage within the scope of 1.5-3.75V, chip I/O port accurately cannot detect its high and low level result.In view of the conductivity of different quality (causing water quality difference because of regional difference or alloy difference) is different, there is water level perception when using common I/O port detection mode and detect insensitive hidden danger, as being in the water quality situation of the voltage detecting blind area of chip I/O port for magnitude of voltage, the reliability of chip I/O port testing result is lower.
Based on this, need provide a kind of for different quality situation, the water level detecting and controlling circuit that detection sensitivity, reliability are all higher.
Utility model content
In view of this, the object of the application is the detection control circuit providing a kind of water level sensing device, is intended to the problems referred to above solving existing common I/O port detection mode existence, to improve sensitivity and the reliability of water tank of clothes dryer water level perception detection.
For this reason, the application's openly following technical scheme:
A detection control circuit for water level sensing device, for detecting the water level detecting voltage obtaining water level sensing device and produce, described circuit comprises:
First power supply;
Be connected to described first power supply, there is the single-chip microprocessor MCU of analog to digital conversion AD mouth;
Be connected between described water level sensing device and described first power supply, for when the water level detecting terminal of described water level sensing device is connected, form the divider resistance of bleeder circuit with described water level sensing device;
Between the AD mouth being connected to described water level sensing device and described single-chip microprocessor MCU, the water level detecting voltage for producing described water level sensing device carries out the voltage follower of voltage follow.
Foregoing circuit, preferably, described divider resistance is connected between the first terminals of described water level sensing device and described first power supply.
Foregoing circuit, preferably, described voltage follower is operational amplifier, wherein:
The electrode input end of described operational amplifier is connected to the first terminals of described water level sensing device;
The negative input of described operational amplifier and output terminal are connected to the AD mouth of described single-chip microprocessor MCU;
The positive supply termination second source of described operational amplifier;
The negative power end of described operational amplifier and the second wiring termination public terminal GND of described water level sensing device.
Foregoing circuit, preferably, the supply voltage VCC1 of described first power supply is not more than the supply voltage VCC2 of described second source.
Foregoing circuit, preferably, also comprises: be connected to the RC filtering circuit between described water level sensing device and described voltage follower, and the 2nd RC filtering circuit between the AD mouth being connected to described voltage follower and described single-chip microprocessor MCU.
Foregoing circuit, preferably, a described RC filtering circuit comprises:
Be connected to the first resistance between the first terminals of described water level sensing device and the electrode input end of described operational amplifier;
Be connected to the first electric capacity between the electrode input end of described operational amplifier and public terminal GND.
Foregoing circuit, preferably, described 2nd RC filtering circuit comprises:
The second resistance that one end is connected to the output terminal of described operational amplifier and negative input, the other end is connected to the AD mouth of described single-chip microprocessor MCU;
Be connected to the second electric capacity between the AD mouth of described single-chip microprocessor MCU and public terminal GND.
From above scheme, the detection control circuit of water level sensing device disclosed in the present application, comprise the first power supply, be connected to described first power supply and have AD mouth single-chip microprocessor MCU, be connected to divider resistance between described water level sensing device and described first power supply, and the voltage follower between the AD mouth being connected to described water level sensing device and described single-chip microprocessor MCU.In the process of water level sensing device perception water level, voltage follower can follow the water level detecting voltage that water level sensing device produces in real time, exactly, and the voltage signal of following is inputted the AD mouth of MCU, realize water level voltage to obtain, and then accurately can judge whether tank water level reaches the water level of setting.Be different from prior art as seen, the application overcomes the problem existing for common I/O port detection mode by AD mouth detection mode, there is not voltage blind zone problem, improve sensitivity and the degree of reliability of water tank of clothes dryer water level perception detection, and be applicable to different quality.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only the embodiment of the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the water level detecting and controlling circuit diagram of the I/O port detection mode of prior art;
Fig. 2 is the detection control circuit diagram of the AD mouth detection mode that the embodiment of the present application one provides;
Fig. 3 is the detection control circuit diagram of the AD mouth detection mode that the embodiment of the present application two provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, be clearly and completely described the technical scheme in the embodiment of the present application, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
Embodiment one
The present embodiment discloses a kind of detection control circuit of water level sensing device, and for detecting the water level detecting voltage obtaining water level sensing device CN2 and produce, with reference to figure 2, described circuit comprises:
First power supply 100;
Be connected to described first power supply 100, there is the single-chip microprocessor MCU 200 of AD (Analog/Digital, analog/digital) mouth;
Be connected between described water level sensing device CN2 and described first power supply 100, for when the water level detecting terminal of described water level sensing device CN2 is connected, form the divider resistance 300 of bleeder circuit with described water level sensing device CN2;
Be connected between described water level sensing device CN2 and the AD mouth of described single-chip microprocessor MCU 200, the water level detecting voltage for producing described water level sensing device CN2 carries out the voltage follower 400 of voltage follow.
As shown in Figure 2, described divider resistance 300 is specifically connected between first terminals of described water level sensing device CN2 and described first power supply 100.
In the present embodiment, described voltage follower 400 specifically adopts operational amplifier U1.Wherein, the electrode input end of operational amplifier U1 is connected to first terminals of water level sensing device CN2; The negative input of operational amplifier U1 and output terminal are connected to the AD mouth of MCU200; The positive supply termination second source VCC2 of operational amplifier U1; The negative power end of operational amplifier U1 and second terminals of water level sensing device CN2 all connect public terminal GND, i.e. ground connection.
Namely, in Fig. 2, the first power supply VCC1 is simultaneously as the power supply of water level sensing device CN2 and single-chip microprocessor MCU 200, and second source VCC2 is the power supply of operational amplifier U1, and GND is power voltage references point.
When water level sensing device CN2 can water in perception tank, namely when the water level of aqua storage tank reaches the rational height of water level sensing device CN2 water level detecting terminal, the water level detecting terminal of water level sensing device CN2 is connected, now, divider resistance 300 and water level sensing device CN2 are (because water exists conductivity, thus a resistance value can be there is when connecting) form a bleeder circuit, thus water level sensing device CN2 can produce a water level detecting voltage, be the voltage at A point place in fig. 2, as the operational amplifier U1 of voltage follower by carrying out voltage follow to the water level detecting voltage at A point place, a good voltage signal can be obtained, and by the AD mouth pin PUMP_CHECK of this voltage signal input single-chip microprocessor MCU 200, when water level sensing device CN2 can not water in perception tank time, the water level detecting terminal of water level sensing device CN2 disconnects, and now, the magnitude of voltage that the AD mouth pin PUMP_CHECK of MCU detects is the supply voltage value VCC1 of the first power supply.
Thus, MCU is by AD mouth detection mode, know water level detecting voltage comparatively accurately, and then on this basis, by the magnitude of voltage of detection and the voltage threshold preset being compared, judge whether the water level of aqua storage tank reaches the height of setting, and when reaching setting height, open water pump, otherwise, do not control pump working.
For tap water, suppose detect A point voltage be U2, MCU AD mouth setting voltage threshold be U0 (rational height of corresponding water level detecting terminal), as U2>U0, namely judge that water storage tank water level does not reach setting height, water air pump inoperative; As U2<U0, namely judge that water level reaches setting height, thus open water pump.Wherein, when the water level detecting terminal of water level sensing device CN2 disconnects, when namely can't detect water, the magnitude of voltage that PUMP_CHECK place detects is VCC1, then water air pump inoperative.
For the situation of different quality, electrical conductivity of water is less, then when water level detecting terminal is connected, its resistance produced at water level sensing device CN2 place is larger, thus the voltage at A point place is higher, otherwise, electrical conductivity of water is larger, then, when water level detecting terminal is connected, the voltage at A point place is then lower.In order to ensure the detection sensitivity under different quality, by being the corresponding rational voltage decision threshold of different quality setting in MCU, accurately detect the water level conditions of aqua storage tank under corresponding water quality.Such as, for the water quality that conductivity is less, can be the larger voltage decision threshold of its setting one in MCU, and for the larger water quality of conductivity, then can for it sets a less voltage decision threshold in MCU.
The application adopts the basic thought of voltage follower to be, and guaranteed water level detects the following feature of voltage, eliminate the signal disturbing to water level detecting voltage on from A point to this transmission path of single-chip microprocessor MCU analog signal interface, can solve in the water quality situation that conductivity is lower, when water level detecting terminal is connected, water level detecting magnitude of voltage because of A point place changes less and is interfered in a transmission path, and causes the situation that water pump is failure to actuate mistakenly.
It should be noted that, in the application, the supply voltage VCC1 of the first power supply should be less than or equal to the supply voltage VCC2 of described second source, i.e. VCC1≤VCC2.Reason is as follows: suppose VCC2<VCC1, water in water level sensing device CN2 perception not screw clamp, namely when the water level detecting terminal of CN2 disconnects, the magnitude of voltage that the pin PUMP_CHECK of MCU detects is then VCC2, now, if VCC2<U0 (the threshold voltage U0 of AD mouth), water pump can be caused to delay work, therefore only VCC1≤VCC2 is guaranteed, guarantee MCU can process not higher than all AD magnitudes of voltage of VCC1, and then the reliability that the perception of guarantee water level detects.
From above scheme, the detection control circuit of water level sensing device disclosed in the present application, comprise the first power supply, be connected to described first power supply and have AD mouth single-chip microprocessor MCU, be connected to divider resistance between described water level sensing device and described first power supply, and the voltage follower between the AD mouth being connected to described water level sensing device and described single-chip microprocessor MCU.In the process of water level sensing device perception water level, voltage follower can follow the water level detecting voltage that water level sensing device produces in real time, exactly, and the voltage signal of following is inputted the AD mouth of MCU, realize water level voltage to obtain, and then accurately can judge whether tank water level reaches the water level of setting.Be different from prior art as seen, the application overcomes the problem existing for common I/O port detection mode by AD mouth detection mode, there is not voltage blind zone problem, improve sensitivity and the degree of reliability of water tank of clothes dryer water level perception detection, and be applicable to different quality.
Embodiment two
In the present embodiment two, with reference to figure 3, described circuit can also comprise: be connected to the first filtering circuit 500 between described water level sensing device and described voltage follower, and the second filtering circuit 600 between the AD mouth being connected to described voltage follower and described MCU.
Wherein, described first filtering circuit 500 comprises the first resistance and the first electric capacity, R4 and C2 namely in Fig. 3.First resistance is connected between first terminals of described water level sensing device CN2 and the electrode input end of described operational amplifier U1; Between the electrode input end that first electric capacity is connected to described operational amplifier U1 and public terminal GND.
Described second filtering circuit 600 comprises the second resistance and the second electric capacity, R5 and C3 namely in Fig. 3.The AD mouth that one end of second resistance is connected to the output terminal of described operational amplifier U1 and negative input, the other end is connected to described MCU; Second electric capacity is connected between the AD mouth of described MCU and public terminal GND.
When the water level detecting terminal of water level sensing device CN2 is connected, the filtering circuit that the water level detecting voltage at A point place forms through resistance R4 and electric capacity C2, and obtain good voltage signal further across the voltage follower be made up of operational amplifier U1, filtering circuit again through being made up of resistance R5 and electric capacity C3 enters the AD mouth of single-chip microprocessor MCU, and what realize voltage follows detection.
The present embodiment all increases RC filtering circuit at water level sensing device and single-chip microprocessor MCU simulating signal AD mouth, can strengthen the antijamming capability of water level detecting signal, thus can improve the sensitivity of water tank of clothes dryer water level perception detection further.
It should be noted that, each embodiment in this instructions all adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar part mutually see.
The above is only the preferred implementation of the application; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the protection domain of the application.
Claims (7)
1. a detection control circuit for water level sensing device, is characterized in that, for detecting the water level detecting voltage obtaining water level sensing device and produce, described circuit comprises:
First power supply;
Be connected to described first power supply, there is the single-chip microprocessor MCU of analog to digital conversion AD mouth;
Be connected between described water level sensing device and described first power supply, for when the water level detecting terminal of described water level sensing device is connected, form the divider resistance of bleeder circuit with described water level sensing device;
Between the AD mouth being connected to described water level sensing device and described single-chip microprocessor MCU, the water level detecting voltage for producing described water level sensing device carries out the voltage follower of voltage follow.
2. circuit according to claim 1, is characterized in that, described divider resistance is connected between the first terminals of described water level sensing device and described first power supply.
3. circuit according to claim 2, is characterized in that, described voltage follower is operational amplifier, wherein:
The electrode input end of described operational amplifier is connected to the first terminals of described water level sensing device;
The negative input of described operational amplifier and output terminal are connected to the AD mouth of described single-chip microprocessor MCU;
The positive supply termination second source of described operational amplifier;
The negative power end of described operational amplifier and the second wiring termination public terminal GND of described water level sensing device.
4. circuit according to claim 3, is characterized in that, the supply voltage VCC1 of described first power supply is not more than the supply voltage VCC2 of described second source.
5. the circuit according to claim 3-4 any one, it is characterized in that, also comprise: be connected to the RC filtering circuit between described water level sensing device and described voltage follower, and the 2nd RC filtering circuit between the AD mouth being connected to described voltage follower and described single-chip microprocessor MCU.
6. circuit according to claim 5, is characterized in that, a described RC filtering circuit comprises:
Be connected to the first resistance between the first terminals of described water level sensing device and the electrode input end of described operational amplifier;
Be connected to the first electric capacity between the electrode input end of described operational amplifier and public terminal GND.
7. circuit according to claim 5, is characterized in that, described 2nd RC filtering circuit comprises:
The second resistance that one end is connected to the output terminal of described operational amplifier and negative input, the other end is connected to the AD mouth of described single-chip microprocessor MCU;
Be connected to the second electric capacity between the AD mouth of described single-chip microprocessor MCU and public terminal GND.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520623865.3U CN205068033U (en) | 2015-08-18 | 2015-08-18 | Detection control circuit of water level perception device |
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| CN201520623865.3U CN205068033U (en) | 2015-08-18 | 2015-08-18 | Detection control circuit of water level perception device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107192424A (en) * | 2017-06-30 | 2017-09-22 | 佛山市云米电器科技有限公司 | A kind of water detection method detected based on electrical conductivity in insulating pot kettle |
| CN108759977A (en) * | 2018-04-27 | 2018-11-06 | 青岛海尔科技有限公司 | A kind of immersion detection device |
| CN111854888A (en) * | 2020-07-25 | 2020-10-30 | 珠海格力电器股份有限公司 | Water level detection method and device, storage medium and kettle |
| CN113854816A (en) * | 2021-09-22 | 2021-12-31 | 华帝股份有限公司 | Evaporator water level detection method and circuit and kitchen electrical equipment |
| CN114287674A (en) * | 2021-12-25 | 2022-04-08 | 深圳麦克韦尔科技有限公司 | Liquid storage assembly, atomizer, battery assembly, electronic atomization device and detection method |
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2015
- 2015-08-18 CN CN201520623865.3U patent/CN205068033U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107192424A (en) * | 2017-06-30 | 2017-09-22 | 佛山市云米电器科技有限公司 | A kind of water detection method detected based on electrical conductivity in insulating pot kettle |
| CN108759977A (en) * | 2018-04-27 | 2018-11-06 | 青岛海尔科技有限公司 | A kind of immersion detection device |
| CN111854888A (en) * | 2020-07-25 | 2020-10-30 | 珠海格力电器股份有限公司 | Water level detection method and device, storage medium and kettle |
| CN111854888B (en) * | 2020-07-25 | 2021-07-02 | 珠海格力电器股份有限公司 | Water level detection method and device, storage medium and kettle |
| CN113854816A (en) * | 2021-09-22 | 2021-12-31 | 华帝股份有限公司 | Evaporator water level detection method and circuit and kitchen electrical equipment |
| CN114287674A (en) * | 2021-12-25 | 2022-04-08 | 深圳麦克韦尔科技有限公司 | Liquid storage assembly, atomizer, battery assembly, electronic atomization device and detection method |
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