CN113701849A - Water level detection device and method and household appliance - Google Patents
Water level detection device and method and household appliance Download PDFInfo
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Abstract
The application relates to a water level detection device, a method and household electrical appliances, wherein the water level detection device comprises: the device comprises an acquisition module, a shaping amplification module and a control module, wherein the control module is pre-stored with a corresponding relation table of water level and frequency; the acquisition module is used for outputting an oscillation signal to the shaping amplification module according to the current water pressure; the shaping amplification module is used for carrying out differential amplification on the oscillation signals and converting the waveform into a square wave through a loop consisting of a resistor, a capacitor, a voltage stabilizing diode and an NPN type triode; and the control module is used for detecting the frequency of the square wave output by the shaping and amplifying module and obtaining the actual water level according to the corresponding relation table of the water level and the frequency. The invention uses the combination of the voltage stabilizing diode and the NPN type triode to replace the complex design of the 4069 chip and the peripheral circuit thereof to realize the water level detection, thereby simplifying the design of the water level detection device and saving the cost.
Description
Technical Field
The present disclosure relates to water level detection technologies, and in particular, to a water level detection apparatus and method, and a household appliance.
Background
Along with the continuous development of intellectualization, the intellectualization of the household electrical appliance industry is popularized more and more. The functions of the household appliances are also more and more powerful, and the household appliances bring greater convenience and rapidness to the life of people. Some household appliances such as washing machines and dish washing machines have functions of water injection, water storage and drainage, and the water level detection and the accuracy thereof are very basic and important.
In the implementation process, the inventor finds that in the traditional technology, a 4069 chip and a peripheral circuit are used by most household appliance water level detection circuits to amplify and shape collected signals, and then a stable pulse number (frequency) is obtained by a software filtering method, so that the actual water level value is obtained through conversion. Thus, there are at least the following problems:
1. the circuit structure is complex, which leads to higher cost;
2. for the condition that the waveform level is abnormal or the waveform is absent, the number (frequency) of pulses cannot be effectively detected, so that the water level detection result is inaccurate.
Disclosure of Invention
The embodiment of the application provides a water level detection device, a water level detection method and household electrical appliance equipment, and aims to solve the problems that an existing water level detection circuit is complex in structure, large in design difficulty, high in cost and inaccurate in water level detection result, simplify the design of the water level detection device, reduce cost and improve the stability and reliability of water level detection.
In order to achieve the above object, in one aspect, an embodiment of the present application provides a water level detecting device, including: the device comprises an acquisition module, a shaping amplification module and a control module, wherein the control module is pre-stored with a corresponding relation table of water level and frequency;
the acquisition module is used for outputting an oscillation signal to the shaping amplification module according to the current water pressure;
the shaping amplification module is used for carrying out differential amplification on the oscillation signals and converting waveforms into square waves; the shaping amplification module comprises a differential amplifier, a first resistor, a second resistor, a first capacitor, a second capacitor, a voltage stabilizing diode and an NPN type triode; wherein,
the input end and the output end of the differential amplifier are respectively connected with the output end of the acquisition module and one end of the first resistor, the other end of the first resistor is connected with one end of the first capacitor, the other end of the first capacitor is respectively connected with the cathode of the voltage stabilizing diode and the base of the NPN type triode, the emitting electrode of the NPN type triode is respectively connected with the anode of the voltage stabilizing diode and one end of the second capacitor and is grounded, and the collecting electrode of the NPN type triode is respectively connected with one end of the second resistor, the other end of the second capacitor and the input end of the control module;
and the control module is used for detecting the frequency of the square wave output by the shaping and amplifying module and obtaining the actual water level according to the corresponding relation table of the water level and the frequency.
In one embodiment, the control module comprises a filtering unit, a counting unit and a query unit;
the filtering unit is used for monitoring the level jump time of the square wave and filtering the square wave of which the level jump time is less than first preset time;
the counting unit is used for counting the square waves filtered by the filtering unit within a second preset time to obtain the frequency of the square waves;
and the query unit is used for querying a corresponding relation table of the water level and the frequency which are pre-stored locally according to the frequency of the square wave to obtain the actual water level.
In one embodiment, the control module further includes a delay unit;
and the delay unit is used for delaying the detection action of the square wave frequency output by the shaping amplification module by preset third time.
In one embodiment, the first preset time is the product of 1/2 periods of the square wave and the filter coefficient.
In one embodiment, the 1/2 cycles of the square wave are 1/2 cycles of the maximum frequency square wave, and the filter coefficient is less than 0.5.
In one embodiment, the collection module is a pressure type water level sensor.
On the other hand, the embodiment of the application also provides a water level detection method, which comprises the following steps:
collecting an oscillation signal corresponding to the current water pressure;
carrying out differential amplification on the oscillation signal through a shaping amplification circuit and converting a waveform into a square wave; the shaping amplifying circuit comprises a differential amplifier, a first resistor, a second resistor, a first capacitor, a second capacitor, a voltage stabilizing diode and an NPN type triode; wherein,
the output end of the differential amplifier is connected with one end of the first resistor, the other end of the first resistor is connected with one end of the first capacitor, the other end of the first capacitor is respectively connected with the negative electrode of the voltage stabilizing diode and the base electrode of the NPN type triode, the emitting electrode of the NPN type triode is respectively connected with the positive electrode of the voltage stabilizing diode and one end of the second capacitor and is grounded, and the collecting electrode of the NPN type triode is respectively connected with one end of the second resistor and the other end of the second capacitor;
and detecting the frequency of the square wave, and obtaining the actual water level according to a corresponding relation table of the water level and the frequency which are prestored locally.
In one embodiment, the detecting the frequency of the square wave and obtaining the actual water level according to a corresponding relation table of the water level and the frequency pre-stored locally includes:
monitoring the level jump time of the square wave, and filtering the square wave of which the level jump time is less than a first preset time;
counting the square waves filtered by the filtering unit within a second preset time to obtain the frequency of the square waves;
and inquiring a corresponding relation table of the water level and the frequency which are prestored locally according to the frequency of the square wave to obtain the actual water level.
In one embodiment, the first preset time is the product of 1/2 periods of the square wave and the filter coefficient.
On the other hand, the embodiment of the application also provides household electrical appliances, which comprise the water level detection device.
The invention has the following advantages and beneficial effects:
aiming at the problems of complex structure and high design difficulty and cost of the existing water level detection circuit, one of the technical schemes replaces the complex design of a 4069 chip and a peripheral circuit thereof with a loop consisting of a first resistor, a second resistor, a first capacitor, a second capacitor, a voltage stabilizing diode and an NPN type triode to realize water level detection, thereby simplifying the design of a water level detection device and saving the cost. On the other hand, for the problem that the water level detection result is inaccurate, one of the above technical solutions effectively avoids the situation that the number (frequency) of pulses cannot be effectively detected due to abnormal waveform level or waveform loss in the square wave counting process by setting the filtering time, so as to improve the stability and reliability of water level detection.
Drawings
Fig. 1 is a schematic structural diagram of a water level detection apparatus according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a water level detection apparatus according to an embodiment of the present application.
Fig. 3 is a schematic diagram of the square wave detected by the control module in fig. 1 or fig. 2.
Fig. 4 is a schematic structural diagram of a water level detection apparatus according to an embodiment of the present application.
Fig. 5 is a schematic structural diagram of a water level detection apparatus according to an embodiment of the present application.
Fig. 6 is a schematic flow chart of a water level detection method according to an embodiment of the present application.
Fig. 7 is a schematic flowchart of a water level detection method according to an embodiment of the present application.
Fig. 8 is a schematic flowchart of a water level detection method according to an embodiment of the present application.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. The terms "mounted," "one end," "the other end," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The camera pose method, apparatus, computer device, and storage medium provided by the present invention are described in further detail below with reference to the accompanying drawings and specific embodiments.
In one embodiment, as shown in fig. 1-2, there is provided a water level detecting apparatus including: the device comprises an acquisition module 1, a shaping amplification module 2 and a control module 3 prestored with a corresponding relation table of water level and frequency.
The acquisition module 1 is used for outputting an oscillation signal to the shaping amplification module 2 according to the current water pressure.
Illustratively, the acquisition module 1 is a pressure type water level sensor, and includes an inductor 11 and a third capacitor 12. The pressure type water level sensor generates different air pressure through the height of the water level, and then influences the internal inductor 11, so that the resonant frequency can be changed accordingly. Therefore, the pressure type water level sensor can accurately output the oscillation signal according to the current water pressure.
And the shaping and amplifying module 2 is used for carrying out differential amplification on the oscillation signals and converting the waveforms into square waves. The shaping amplifying module 2 comprises a differential amplifier 21, a first resistor 22, a second resistor 26, a first capacitor 23, a second capacitor 27, a zener diode 24 and an NPN-type triode 25.
The input end and the output end of the differential amplifier 21 are respectively connected to the output end of the acquisition module 1 and one end of the first resistor 22, the other end of the first resistor 22 is connected to one end of the first capacitor 23, the other end of the first capacitor 23 is respectively connected to the negative electrode of the zener diode 24 and the base of the NPN type triode 25, the emitter of the NPN type triode 25 is respectively connected to the positive electrode of the zener diode 24 and one end of the second capacitor 27 and is grounded, and the collector of the NPN type triode 25 is respectively connected to one end of the second resistor 26, the other end of the second capacitor 27 and the input end of the control module 3.
As in the prior art, a 4069 chip is usually used to connect with the pressure type water level sensor. The air pressure is generated by the water level, so that the internal inductance 11 is changed, and the frequency of the oscillating circuit is changed. Through 4069 chip and peripheral circuit, inverting phase, amplifying, shaping, and outputting to control system for square wave collection and frequency variation to determine water level. This leads to a complicated structural design of the water level detecting apparatus and a high design cost. Therefore, in the embodiment, the circuit formed by the first resistor 22, the second resistor 26, the first capacitor 23, the second capacitor 27, the zener diode 24 and the NPN type triode 25 replaces the complex design of the 4069 chip and the peripheral circuit thereof to realize water level detection, so that the design of the water level detection device is simplified, and the cost is saved.
Illustratively, the hardware circuit comprises a first capacitor 23, a first resistor 22, a voltage stabilizing diode 24, an NPN-type triode 25, a second resistor 26 and a second capacitor 27, which are connected in series, in addition to the pressure type water level sensor which outputs a collectable signal. The pressure type water level sensor generates different internal inductance 11 quantities through different water levels, and generates frequency f and amplitude V1The sine wave of (1); after passing through a differential amplifier 21, the frequency f becomes the amplitude V1Of (c) is a sine wave. After the sine wave passes through a loop formed by the first resistor 22, the first capacitor 23 and the voltage stabilizing diode 24, the amplitude V is1Greater than 0 and greater than the breakdown voltage VDR of zener diode 241Of time, amplitude V1Is clamped to a voltage VDR1When VDR is used1When the VBE conduction voltage of the NPN transistor 25 is higher than the VBE conduction voltage of the NPN transistor 25, the NPN transistor 25 is turned on, and the control module 3 can detect a low level; when the amplitude V is1Less than 0 and greater than the conduction voltage VDF of the zener diode 241At this time, the base voltage of NPN transistor 25 is clamped to-VDF1 The NPN transistor 25 is turned off and the control module 3 can detect a high level. The control module 3 can thus detect a square wave with a frequency f, wherein the square wave has a waveform as shown in the figure3, respectively.
And the control module 3 is used for detecting the frequency of the square wave output by the shaping amplification module 2 and obtaining the actual water level according to the corresponding relation table of the water level and the frequency.
As shown in fig. 4, in one embodiment, the control module 3 includes a filtering unit, a counting unit and a querying unit;
the filtering unit is used for monitoring the level jump time of the square wave and filtering the square wave of which the level jump time is less than first preset time;
the counting unit is used for counting the square waves filtered by the filtering unit within a second preset time to obtain the frequency of the square waves;
and the query unit is used for querying a corresponding relation table of the water level and the frequency which are pre-stored locally according to the frequency of the square wave to obtain the actual water level.
As shown in fig. 5, in one embodiment, the control module 3 further includes a delay unit;
and the delay unit is used for delaying the detection action of the square wave frequency output by the shaping amplification module 2 by preset third time.
Illustratively, the Control module 3 is an MCU (Motor Control Unit) loaded with a relevant software algorithm, and after the Control module 3 can detect a square wave with a frequency f, the Control module 3 is initialized after being powered on, and after the initialization, performs a detection action of the frequency of the square wave. Thus, the control module 3 delays t0And the water level frequency range f is known in advance0～f1(according to the manufacturer's specifications), wherein f0<f<f1The minimum value t of half the square wave period can be obtained1。
The control module 3 counts the detected square waves and monitors the level jump time of the square waves. Monitoring and timing during level conversion, if the interval time of level conversion is less than nt1Where n is the filter coefficient, n<0.5, no counting is performed, otherwise, 1 is added to the counting. The control module 3 continues to count until the duration t2To obtainFrequency f to water level2. And inquiring a corresponding relation table of the water level frequency and the water level, determining the actual water level height, and performing subsequent treatment.
In the embodiment, the condition that the pulse number (frequency) cannot be effectively detected due to abnormal waveform level or waveform loss in the square wave counting process is effectively avoided by setting the filtering time, so that the stability and the reliability of water level detection are improved.
In one embodiment, the first preset time is the product of 1/2 periods of the square wave and the filter coefficient.
To adjust the filtering time according to the circuit disturbance condition, for example, when the first preset time is 1/2 periods of the square wave, the practicability of the implementation is high, and the implementation cost is low.
In one embodiment, the 1/2 cycles of the square wave are 1/2 cycles of the maximum frequency square wave, and the filter coefficient is less than 0.5.
As shown in fig. 3, the control module 3 can detect the square wave signal of the water level height conversion, but also has resonance interference. The software loaded by the control module 3 carries out the next filtering to ensure the accuracy of the water level parameter. According to the specification provided by a water level sensor supplier, obtaining the frequency range of the measurable water level, namely determining the actual frequency range of the square wave, and further determining the half period t of the square wave with the maximum frequency1. Introducing a filter coefficient n (n)<0.5). Therefore, the situation that the number (frequency) of pulses cannot be effectively detected due to abnormal waveform level or waveform loss in the process of counting the square waves is avoided, and the stability and reliability of square wave counting are improved.
On the other hand, as shown in fig. 6, an embodiment of the present application further provides a water level detection method, including:
and S1, acquiring an oscillation signal corresponding to the current water pressure.
Illustratively, the acquisition module 1 is a pressure type water level sensor. The pressure type water level sensor generates different air pressure through the height of the water level, and then influences the internal inductor 11, so that the resonant frequency can be changed accordingly. Therefore, the pressure type water level sensor can accurately output the oscillation signal according to the current water pressure.
S2, carrying out differential amplification on the oscillation signal through a shaping amplification circuit and converting the waveform into a square wave; the shaping amplifying circuit comprises a differential amplifier 21, a first resistor 22, a second resistor 26, a first capacitor 23, a second capacitor 27, a zener diode 24 and an NPN-type triode 25.
The output end of the differential amplifier 21 is connected to one end of the first resistor 22, the other end of the first resistor 22 is connected to one end of the first capacitor 23, the other end of the first capacitor 23 is respectively connected to the negative electrode of the zener diode 24 and the base of the NPN type triode 25, the emitter of the NPN type triode 25 is respectively connected to the positive electrode of the zener diode 24 and one end of the second capacitor 27 and grounded, and the collector of the NPN type triode 25 is respectively connected to one end of the second resistor 26 and the other end of the second capacitor 27.
As in the prior art, a 4069 chip is usually used to connect with the pressure type water level sensor. The air pressure is generated by the water level, so that the internal inductance 11 is changed, and the frequency of the oscillating circuit is changed. Through 4069 chip and peripheral circuit, inverting phase, amplifying, shaping, and outputting to control system for square wave collection and frequency variation to determine water level. This leads to a complicated structural design of the water level detecting apparatus and a high design cost. Therefore, in the embodiment, the circuit formed by the first resistor 22, the second resistor 26, the first capacitor 23, the second capacitor 27, the zener diode 24 and the NPN type triode 25 replaces the complex design of the 4069 chip and the peripheral circuit thereof to realize water level detection, so that the design of the water level detection device is simplified, and the cost is saved.
As shown in fig. 2, the hardware circuit includes, for example, a first capacitor 23, a first resistor 22, a zener diode 24, an NPN-type transistor 25, a second resistor 26, and a second capacitor 27, which are connected in series, in addition to the pressure type water level sensor that outputs a signal that can be collected. The pressure type water level sensor generates different internal inductance 11 quantities through different water levels, and generates frequency f and amplitude V1The sine wave of (1); warp beamAfter passing through the differential amplifier 21, the frequency f becomes the amplitude V1Of (c) is a sine wave. After the sine wave passes through a loop formed by the first resistor 22, the first capacitor 23 and the voltage stabilizing diode 24, the amplitude V is1Greater than 0 and greater than the breakdown voltage VDR of zener diode 241Of time, amplitude V1Is clamped to a voltage VDR1When VDR is used1When the VBE conduction voltage of the NPN transistor 25 is higher than the VBE conduction voltage of the NPN transistor 25, the NPN transistor 25 is turned on, and the control module 3 can detect a low level; when the amplitude V is1Less than 0 and greater than the conduction voltage VDF of the zener diode 241At this time, the base voltage of NPN transistor 25 is clamped to-VDF1 The NPN transistor 25 is turned off and the control module 3 can detect a high level. The control module 3 can thus detect a square wave with a frequency f, wherein the waveform of the square wave is shown in fig. 3.
And S3, detecting the frequency of the square wave, and obtaining the actual water level according to a corresponding relation table of the water level and the frequency which are pre-stored locally.
As shown in fig. 7, in one embodiment, the detecting the frequency of the square wave and obtaining the actual water level according to a corresponding relation table of the water level and the frequency pre-stored locally includes:
s31, monitoring the level jump time of the square wave, and filtering the square wave of which the level jump time is less than a first preset time;
s32, counting the square waves filtered by the filtering unit within a second preset time to obtain the frequency of the square waves;
and S33, inquiring a corresponding relation table of the water level and the frequency which are pre-stored locally according to the frequency of the square wave to obtain the actual water level.
As shown in fig. 8, in one embodiment, the detecting the frequency of the square wave and obtaining the actual water level according to a corresponding relation table of the water level and the frequency pre-stored locally further includes:
s30, delaying the detection operation of the square wave frequency output from the shaping and amplifying module 2 by a preset third time.
Illustratively, the Control module 3 is an MCU (Motor Control Unit) loaded with relevant software algorithms, in the processWhen the control module 3 detects the square wave having the frequency f, the control module 3 is initialized after power-on, and performs the operation of detecting the frequency of the square wave after the initialization. Thus, the control module 3 delays t0And the water level frequency range f is known in advance0～f1(according to the manufacturer's specifications), wherein f0<f<f1The minimum value t of half the square wave period can be obtained1。
The control module 3 counts the detected square waves and monitors the level jump time of the square waves. Monitoring and timing during level conversion, if the interval time of level conversion is less than nt1Where n is the filter coefficient, n<0.5, no counting is performed, otherwise, 1 is added to the counting. The control module 3 continues to count until the duration t2To obtain the water level frequency f2. And inquiring a corresponding relation table of the water level frequency and the water level, determining the actual water level height, and performing subsequent treatment.
In the embodiment, the condition that the pulse number (frequency) cannot be effectively detected due to abnormal waveform level or waveform loss in the square wave counting process is effectively avoided by setting the filtering time, so that the stability and the reliability of water level detection are improved.
In one embodiment, the first preset time is the product of 1/2 periods of the square wave and the filter coefficient.
To adjust the filtering time according to the circuit disturbance condition, for example, when the first preset time is 1/2 periods of the square wave, the practicability of the implementation is high, and the implementation cost is low.
In one embodiment, the 1/2 cycles of the square wave are 1/2 cycles of the maximum frequency square wave, and the filter coefficient is less than 0.5.
As shown in fig. 3, the control module 3 can detect the square wave signal of the water level height conversion, but also has resonance interference. The software loaded by the control module 3 carries out the next filtering to ensure the accuracy of the water level parameter. According to the specification provided by a water level sensor supplier, obtaining the frequency range of the measurable water level, namely determining the actual frequency range of the square wave, and further determining the maximum frequencySquare wave of (d) for half a period t1. Introducing a filter coefficient n (n)<0.5). Therefore, the situation that the number (frequency) of pulses cannot be effectively detected due to abnormal waveform level or waveform loss in the process of counting the square waves is avoided, and the stability and reliability of square wave counting are improved.
On the other hand, the embodiment of the application also provides household electrical appliances, which comprise the water level detection device.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A water level detection device is characterized by comprising an acquisition module, a shaping amplification module and a control module, wherein a corresponding relation table of water level and frequency is prestored;
the acquisition module is used for outputting an oscillation signal to the shaping amplification module according to the current water pressure;
the shaping amplification module is used for carrying out differential amplification on the oscillation signals and converting waveforms into square waves; the shaping amplification module comprises a differential amplifier, a first resistor, a second resistor, a first capacitor, a second capacitor, a voltage stabilizing diode and an NPN type triode; wherein,
the input end and the output end of the differential amplifier are respectively connected with the output end of the acquisition module and one end of the first resistor, the other end of the first resistor is connected with one end of the first capacitor, the other end of the first capacitor is respectively connected with the cathode of the voltage stabilizing diode and the base of the NPN type triode, the emitting electrode of the NPN type triode is respectively connected with the anode of the voltage stabilizing diode and one end of the second capacitor and is grounded, and the collecting electrode of the NPN type triode is respectively connected with one end of the second resistor, the other end of the second capacitor and the input end of the control module;
and the control module is used for detecting the frequency of the square wave output by the shaping and amplifying module and obtaining the actual water level according to the corresponding relation table of the water level and the frequency.
2. The water level detection device according to claim 1, wherein the control module comprises a filtering unit, a counting unit and a query unit;
the filtering unit is used for monitoring the level jump time of the square wave and filtering the square wave of which the level jump time is less than first preset time;
the counting unit is used for counting the square waves filtered by the filtering unit within a second preset time to obtain the frequency of the square waves;
and the query unit is used for querying a corresponding relation table of the water level and the frequency which are pre-stored locally according to the frequency of the square wave to obtain the actual water level.
3. The water level detecting apparatus according to claim 2, wherein the control module further comprises a delay unit;
and the delay unit is used for delaying the detection action of the square wave frequency output by the shaping amplification module by preset third time.
4. The water level detecting device according to claim 2, wherein the first preset time is a product of 1/2 periods of the square wave and a filter coefficient.
5. The water level detecting apparatus according to claim 4, wherein 1/2 cycles of the square wave are 1/2 cycles of a maximum frequency square wave, and the filter coefficient is less than 0.5.
6. The water level detecting device according to claim 1, wherein the collecting module is a pressure type water level sensor.
7. A water level detection method, comprising:
collecting an oscillation signal corresponding to the current water pressure;
carrying out differential amplification on the oscillation signal through a shaping amplification circuit and converting a waveform into a square wave; the shaping amplifying circuit comprises a differential amplifier, a first resistor, a second resistor, a first capacitor, a second capacitor, a voltage stabilizing diode and an NPN type triode; wherein,
the output end of the differential amplifier is connected with one end of the first resistor, the other end of the first resistor is connected with one end of the first capacitor, the other end of the first capacitor is respectively connected with the negative electrode of the voltage stabilizing diode and the base electrode of the NPN type triode, the emitting electrode of the NPN type triode is respectively connected with the positive electrode of the voltage stabilizing diode and one end of the second capacitor and is grounded, and the collecting electrode of the NPN type triode is respectively connected with one end of the second resistor and the other end of the second capacitor;
and detecting the frequency of the square wave, and obtaining the actual water level according to a corresponding relation table of the water level and the frequency which are prestored locally.
8. The method for detecting water level according to claim 7, wherein the detecting the frequency of the square wave and obtaining the actual water level according to the corresponding relation table of the water level and the frequency pre-stored locally comprises:
monitoring the level jump time of the square wave, and filtering the square wave of which the level jump time is less than a first preset time;
counting the square waves filtered by the filtering unit within a second preset time to obtain the frequency of the square waves;
and inquiring a corresponding relation table of the water level and the frequency which are prestored locally according to the frequency of the square wave to obtain the actual water level.
9. The water level detecting method according to claim 8, wherein the first preset time is a product of 1/2 periods of the square wave and a filter coefficient.
10. An electric household appliance comprising a water level detection device according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111030738.9A CN113701849A (en) | 2021-09-03 | 2021-09-03 | Water level detection device and method and household appliance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114343438A (en) * | 2022-02-17 | 2022-04-15 | 杭州老板电器股份有限公司 | Water level detection system and method of cooking equipment with steaming function and electronic equipment |
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| JPH03122525A (en) * | 1989-10-05 | 1991-05-24 | Matsushita Electric Ind Co Ltd | Detecting device for water level |
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| CN209416446U (en) * | 2018-11-30 | 2019-09-20 | 深圳和而泰小家电智能科技有限公司 | A kind of water level detection circuit and electrical equipment |
| CN210893324U (en) * | 2019-12-30 | 2020-06-30 | 郑州科技学院 | Underground pipeline water level detection system |
| CN111586159A (en) * | 2020-05-06 | 2020-08-25 | 李建厂 | Sewage treatment monitored control system based on thing networking |
| CN113114147A (en) * | 2021-04-26 | 2021-07-13 | 山东省科学院海洋仪器仪表研究所 | Underwater sound equipment awakening circuit and awakening method |
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| JPH03122525A (en) * | 1989-10-05 | 1991-05-24 | Matsushita Electric Ind Co Ltd | Detecting device for water level |
| CN105181072A (en) * | 2015-03-08 | 2015-12-23 | 无锡桑尼安科技有限公司 | Automatic water level detection method |
| CN209416446U (en) * | 2018-11-30 | 2019-09-20 | 深圳和而泰小家电智能科技有限公司 | A kind of water level detection circuit and electrical equipment |
| CN210893324U (en) * | 2019-12-30 | 2020-06-30 | 郑州科技学院 | Underground pipeline water level detection system |
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| CN114343438A (en) * | 2022-02-17 | 2022-04-15 | 杭州老板电器股份有限公司 | Water level detection system and method of cooking equipment with steaming function and electronic equipment |
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