CN106930056B - Washing machine and detergent detection device thereof - Google Patents
Washing machine and detergent detection device thereof Download PDFInfo
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- CN106930056B CN106930056B CN201710174675.1A CN201710174675A CN106930056B CN 106930056 B CN106930056 B CN 106930056B CN 201710174675 A CN201710174675 A CN 201710174675A CN 106930056 B CN106930056 B CN 106930056B
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/14—Arrangements for detecting or measuring specific parameters
- D06F34/22—Condition of the washing liquid, e.g. turbidity
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Abstract
The invention discloses a washing machine and a detergent detection device thereof, wherein the device comprises: the detection electrode is arranged in an automatic detergent feeding device of the washing machine; the alternating voltage generating circuit is connected with the detection electrode and is used for generating alternating voltage and applying the alternating voltage to the detection electrode; the detection circuit generates a detection signal by detecting whether the two detection ends of the detection electrode are electrified or not; and the controller is connected with the detection circuit and used for acquiring the liquid level of the detergent in the automatic detergent feeding device according to the detection signal. According to the device provided by the invention, an oxide film can be effectively prevented from being formed on the detection electrode, detection failure is avoided, the liquid level of the detergent can be accurately judged, a user is timely reminded of adding the detergent, and the reliability of the washing machine is improved.
Description
Technical Field
The invention relates to the technical field of washing appliances, in particular to a washing machine detergent detection device and a washing machine.
Background
At present, regarding a washing machine with an automatic detergent feeding function, a detergent automatic feeding device is arranged inside the washing machine, so that a user cannot directly see the liquid level of detergent, and therefore the liquid level of the detergent needs to be detected. The conventional detection scheme is to connect a direct current voltage to a probe, that is, the probe is arranged at a certain position of the automatic detergent feeding device, and the liquid level of the detergent is judged by detecting whether a detection electrode of the probe has a conductive characteristic in the detergent. However, when a dc voltage is applied to the detection electrode of the probe in the detergent for a long time, the detection electrode of the probe is also in a plating state for a long time, and an oxide film is formed on the surface of the detection electrode of the probe. Due to the non-conductivity of the oxide film, the probe rod fails, the whole detection circuit cannot work normally, and the washing machine cannot correctly judge the liquid level of the detergent.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above.
Therefore, an object of the present invention is to provide a detergent detection device for a washing machine, which can effectively prevent an oxide film from being formed on a detection electrode, prevent detection failure, and further correctly determine the liquid level of a detergent, so as to prompt a user to add the detergent in time, thereby improving the reliability of the washing machine.
A second object of the present invention is to provide a washing machine.
In order to achieve the above object, a first aspect of the present invention provides a detergent detection device for a washing machine, including: the detection electrode is arranged in an automatic detergent feeding device of the washing machine; an alternating voltage generating circuit connected to the detection electrode, the alternating voltage generating circuit being configured to generate an alternating voltage and apply the alternating voltage to the detection electrode; a detection circuit that generates a detection signal by detecting whether or not a current is applied between two detection terminals of the detection electrode; and the controller is connected with the detection circuit and used for acquiring the liquid level of the detergent in the automatic detergent feeding device according to the detection signal.
According to the detergent detection device of the washing machine, the alternating voltage is generated through the alternating voltage generation circuit, the generated alternating voltage is applied to the detection electrode, then whether electricity is conducted between two detection ends of the detection electrode or not is detected through the detection circuit to generate a detection signal, and finally, the liquid level of detergent in the automatic detergent feeding device is obtained through the controller according to the detection signal. According to the device, the alternating voltage is applied to the two ends of the detection electrode, the formation of an oxide film on the detection electrode can be effectively avoided, the detection failure is avoided, the liquid level of the detergent can be correctly judged, a user is timely reminded of adding the detergent, and the reliability of the washing machine is improved.
In addition, the detergent detection device for the washing machine according to the above embodiment of the present invention may further have the following additional technical features:
according to one embodiment of the invention, the alternating voltage generating circuit comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube, wherein a collector of the first switching tube is connected with an emitter of the second switching tube, and a first node is arranged between the collector of the first switching tube and the emitter of the second switching tube; a collector of the third switching tube is connected with an emitter of the fourth switching tube, and a second node is arranged between the collector of the third switching tube and the emitter of the fourth switching tube; the emitting electrode of the first switching tube is connected with the emitting electrode of the third switching tube, a third node is arranged between the emitting electrode of the first switching tube and the emitting electrode of the third switching tube, and the third node is connected with a first preset power supply; a collector electrode of the second switching tube is connected with a collector electrode of the fourth switching tube, a fourth node is arranged between the collector electrode of the second switching tube and the collector electrode of the fourth switching tube, and the fourth node is grounded through a first resistor; the first node is connected with a first electrifying end of the detection electrode, the second node is connected with a second electrifying end of the detection electrode, and the controller is further used for controlling the switching time sequence from the first switching tube to the fourth switching tube so that the first node and the second node output the alternating voltage.
Further, the alternating voltage generating circuit further includes: a first input end of the first optocoupler is connected to a second preset power supply, a second input end of the first optocoupler is connected to a first trigger signal output end of the controller, a first output end of the first optocoupler is connected with a base electrode of the first switch tube through a second resistor and is connected with a base electrode of the fourth switch tube through a third resistor, and a second output end of the first optocoupler is grounded; a first input end of the second optocoupler is connected to the second preset power supply, a second input end of the second optocoupler is connected to a second trigger signal output end of the controller, a first output end of the second optocoupler is connected with a base electrode of the second switching tube through a fourth resistor and is connected with a base electrode of the third switching tube through a fifth resistor, and a second output end of the second optocoupler is grounded; the controller alternately outputs trigger signals through the first trigger signal output end and the second trigger signal output end to control the conduction of the first switching tube and the fourth switching tube and the conduction of the second switching tube and the third switching tube to be alternately carried out.
According to an embodiment of the present invention, the alternating voltage generating circuit further includes a sixth resistor, a seventh resistor, an eighth resistor, and a ninth resistor, the sixth resistor is connected between the base and the emitter of the first switching tube, the seventh resistor is connected between the base and the emitter of the second switching tube, the eighth resistor is connected between the base and the emitter of the third switching tube, and the ninth resistor is connected between the base and the emitter of the fourth switching tube.
According to an embodiment of the present invention, a detection terminal of the detection circuit is connected to the fourth node, and the detection circuit is configured to detect a voltage of the fourth node to output the detection signal.
According to one embodiment of the invention, the detection circuit comprises: one end of the first capacitor is connected with the fourth node, and the other end of the first capacitor is grounded; a cathode of the first diode is connected with the fourth node, and an anode of the first diode is connected with the other end of the first capacitor and then grounded; a second diode, an anode of which is connected to the fourth node, and a cathode of which is connected to the first preset power supply; the base electrode of the fifth switching tube is connected with the fourth node through a tenth resistor, the emitting electrode of the fifth switching tube is grounded, the collector electrode of the fifth switching tube is connected with the base electrode of the sixth switching tube through an eleventh resistor, the emitting electrode of the sixth switching tube is connected to the first preset power supply, and the collector electrode of the sixth switching tube serves as the output end of the detection circuit.
According to an embodiment of the present invention, the detection circuit further includes a twelfth resistor and a thirteenth resistor, the twelfth resistor is connected between the base and the emitter of the fifth switching tube, and the thirteenth resistor is connected between the base and the emitter of the sixth switching tube.
According to an embodiment of the invention, the detection circuit further comprises: a first input end of the third optocoupler is connected with a collector of the sixth switching tube through a fourteenth resistor, a second input end of the third optocoupler is grounded, a first output end of the third optocoupler is connected with a second preset power supply through a fifteenth resistor, and a second output end of the third optocoupler is grounded; and one end of the sixteenth resistor is connected with the first output end of the third optocoupler, and the other end of the sixteenth resistor is connected with the controller.
In order to achieve the above object, a second aspect of the present invention provides a washing machine, including the above detergent detection device for a washing machine.
According to the washing machine provided by the embodiment of the invention, by applying the alternating voltage to the two ends of the detection electrode, the washing machine detergent detection device can effectively prevent an oxide film from being formed on the detection electrode, avoid detection failure, further correctly judge the liquid level of the detergent, timely remind a user of adding the detergent, and improve the reliability of the washing machine.
Drawings
FIG. 1 is a circuit diagram of a detergent detecting device of a washing machine according to an embodiment of the present invention;
FIG. 2 is a schematic view of a position relationship between a detection electrode and an automatic detergent dispensing device according to an embodiment of the present invention; and
fig. 3 is a block schematic view of the washing machine according to the present embodiment.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A washing machine and a detergent detecting device thereof according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a circuit diagram of a detergent detection device of a washing machine according to an embodiment of the present invention.
As shown in fig. 1, the detergent detection device of the washing machine according to the embodiment of the present invention may include a detection electrode 10, an alternating voltage generating circuit 100, a detection circuit 200, and a controller (not specifically shown).
As shown in fig. 2, the detection electrode 10 is disposed in an automatic detergent dispenser 20 of a washing machine. An alternating voltage generating circuit 100 is connected to the detection electrode 10, and the alternating voltage generating circuit 100 is configured to generate an alternating voltage and apply the alternating voltage to the detection electrode 10. The detection circuit 200 generates a detection signal by detecting whether or not current is applied between the two detection terminals of the detection electrode 10. The controller is connected to the detection circuit 200, and the controller is configured to obtain the liquid level of the detergent in the automatic detergent feeding device 20 according to the detection signal.
Specifically, the alternating voltage generating circuit 100 applies the alternating voltage to the detecting electrode 10 of the probe, so that the positive and negative polarities of the electrolytic electrodes at the two ends of the detecting electrode 10 are continuously changed, the current can be prevented from flowing through the detecting electrode 10 from only one direction, the detecting electrode 10 of the probe can be prevented from generating an oxide film, the detection failure is avoided, and the service life of the probe is prolonged. Whether the two detection ends of the detection electrode 10 of the probe are electrified or not is detected by the detection circuit 200, and a detection signal such as a high-level detection signal or a low-level detection signal is generated. Further, the controller can acquire the liquid level of the detergent in the automatic detergent feeding device 20 according to the detection signal, and can send an alarm through the controller to remind a user to feed the detergent into the automatic detergent feeding device 20 in time when the liquid level of the detergent is insufficient, so that the reliability of the washing machine is improved.
In one embodiment of the present invention, the alternating voltage generating circuit 100 may include a first switching tube Q1, a second switching tube Q2, a third switching tube Q3 and a fourth switching tube Q4. The collector of the first switch transistor Q1 is connected to the emitter of the second switch transistor Q2, and a first node J1 is located between the collector of the first switch transistor Q1 and the emitter of the second switch transistor Q2. The collector of the third switching tube Q3 is connected to the emitter of the fourth switching tube Q4, and a second node J2 is located between the collector of the third switching tube Q3 and the emitter of the fourth switching tube Q4. An emitter of the first switching tube Q1 is connected to an emitter of the third switching tube Q3, a third node J3 is provided between the emitter of the first switching tube Q1 and the emitter of the third switching tube Q3, and the third node J3 is connected to a first predetermined power source VCC1 (e.g., +12V dc voltage). The collector of the second switching tube Q2 is connected to the collector of the fourth switching tube Q4, and a fourth node J4 is located between the collector of the second switching tube Q2 and the collector of the fourth switching tube Q4, and the fourth node J4 is grounded to GND through a first resistor R1. The first node J1 is connected to the first power-on terminal of the detection electrode 10, the second node J2 is connected to the second power-on terminal of the detection electrode 10, and the controller is further configured to control the switching timings of the first switch tube Q1 to the fourth switch tube Q4 so that the first node J1 and the second node J2 output alternating voltages.
In an embodiment of the invention, the alternating voltage generating circuit 100 may further comprise a first optical coupler OC1 and a second optical coupler OC 2. The first input end of the first optical coupler OC1 is connected to a second preset power VCC2 (such as +5V direct current voltage), the second input end of the first optical coupler OC1 is connected with a first trigger signal output end MCU _1 of the controller through a seventeenth resistor R17, the first output end of the first optical coupler OC1 is connected with the base of the first switch tube Q1 through a second resistor R2 and is connected with the base of the fourth switch tube Q4 through a third resistor R3, and the second output end of the first optical coupler OC1 is grounded GND. The first input end of the second optical coupler OC2 is connected to a second preset power supply VCC2, the second input end of the second optical coupler OC2 is connected with a second trigger signal output end MCU _2 of the controller through an eighteenth resistor R18, the first output end of the second optical coupler OC2 is connected with the base of the second switch tube Q2 through a fourth resistor R4 and connected with the base of the third switch tube Q3 through a fifth resistor R5, and the second output end of the second optical coupler OC2 is grounded GND. The controller alternately outputs trigger signals through the first trigger signal output end MCU _1 and the second trigger signal output end MCU _2 to control the conduction of the first switch tube Q1 and the fourth switch tube Q4 and the conduction of the second switch tube Q2 and the third switch tube Q3 to alternately proceed.
In an embodiment of the present invention, the alternating voltage generating circuit 100 may further include a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9, the sixth resistor R6 is connected between the base and the emitter of the first switching tube Q1, the seventh resistor R7 is connected between the base and the emitter of the second switching tube Q2, the eighth resistor R8 is connected between the base and the emitter of the third switching tube Q3, and the ninth resistor R9 is connected between the base and the emitter of the fourth switching tube Q4, so as to improve the reliability of turning off the first to fourth switching tubes Q1 to Q4.
Specifically, the controller may output a timing low level control signal. When the first trigger signal output end MCU _1 of the controller outputs a low level control signal, the first optical coupler OC1 is turned on, the first switch tube Q1 and the fourth switch tube Q4 are both turned on, if the detection electrode 10 is in detergent, the probe is in a conductive state, and a current I2 flows between the detection electrodes 10. When the second trigger signal output end MCU _2 of the controller outputs a low level control signal, the second optocoupler OC2 is turned on, the second switch tube Q2 and the third switch tube Q3 are both turned on, if the detection electrode 10 is in detergent, the probe is in a conducting state, and a current I1 flows between the detection electrodes 10.
That is, the low-level control signal can be alternately output through the first trigger signal output end MCU _1 and the second trigger signal output end MCU _2 of the controller, so that the first switching tube Q1, the fourth switching tube Q4, the second switching tube Q2 and the third switching tube Q3 are alternately turned on, and the positive and negative polarities of the electrolysis electrodes at both ends of the detection electrode 10 of the probe can be continuously changed, thereby effectively preventing the current from flowing through the detection electrode 10 from only one direction, further preventing the detection electrode 10 of the probe from generating an oxide film, preventing detection failure, and prolonging the service life of the probe.
In one embodiment of the present invention, the sensing terminal a of the sensing circuit 200 is connected to the fourth node J4, and the sensing circuit 200 is used for sensing the voltage of the fourth node J4 to output a sensing signal.
Specifically, when the first switch Q1 and the fourth switch Q4 are turned on, or the second switch Q2 and the third switch Q3 are turned on, and form a loop with the detection electrode 10, that is, when a current flows through the detection electrode 10, the voltage of the fourth node J4, that is, the voltage of the detection terminal a, can be detected by the detection circuit 200, and a detection signal, such as a high-level detection signal, is output. When the first switch Q1 and the fourth switch Q4, or the second switch Q2 and the third switch Q3, cannot form a loop with the detecting electrode 10, the detecting circuit 200 can detect the voltage at the fourth node J4 and output a detection signal, such as a low-level detection signal.
In one embodiment of the present invention, the detection circuit 200 may include a first capacitor C1, a first diode D1, a second diode D2, a fifth switch tube Q5, and a sixth switch tube Q6. One end of the first capacitor C1 is connected to the fourth node J4, and the other end of the first capacitor C1 is connected to GND. The cathode of the first diode D1 is connected to the fourth node J4, and the anode of the first diode D1 is connected to the other end of the first capacitor C1 and then grounded to GND. An anode of the second diode D2 is connected to the fourth node J4, and a cathode of the second diode D2 is connected to a first preset power VCC 1. The base of the fifth switch tube Q5 is connected to the fourth node J4 through a tenth resistor R10, the emitter of the fifth switch tube Q5 is grounded GND, the collector of the fifth switch tube Q5 is connected to the base of the sixth switch tube Q6 through an eleventh resistor R11, the emitter of the sixth switch tube Q6 is connected to a first preset power source VCC1, and the collector of the sixth switch tube Q6 serves as the output terminal of the detection circuit 200.
In an embodiment of the present invention, the detection circuit 200 may further include a twelfth resistor R12 and a thirteenth resistor R13, the twelfth resistor R12 is connected between the base and the emitter of the fifth switching tube Q5, and the thirteenth resistor R13 is connected between the base and the emitter of the sixth switching tube Q6.
In an embodiment of the present invention, the detection circuit 200 may further include a third optical coupler OC3 and a sixteenth resistor R16. The first input end of the third optocoupler OC3 is connected with the collector of the sixth switching tube Q6 through a fourteenth resistor R14, the second input end of the third optocoupler OC3 is grounded GND, the first output end of the third optocoupler OC3 is connected with the second preset power supply VCC2 through a fifteenth resistor R15, and the second output end of the third optocoupler OC3 is grounded GND. One end of a sixteenth resistor R16 is connected with the first output end of the third optical coupler OC3, and the other end of the sixteenth resistor R16 is connected with the controller.
Specifically, the level of the detergent may be acquired by the controller according to the detection signal. If the detection signal of the detection end A is a high-level detection signal, the fifth switch tube Q5, the sixth switch tube Q6 and the third optical coupler OC3 are sequentially switched on, a low-level signal is detected through a detergent liquid level output end DETERGENT of the detection circuit 200, the low-level signal is sent to the controller, and the controller can judge that the liquid level of the detergent is higher than or equal to a set threshold value according to the low-level signal output by the detergent liquid level output end DETERGENT, namely, the detection electrode 10 of the probe is in the washing liquid without adding the detergent. If the detected signal of detection section A is the low level signal, then fifth switch tube Q5, sixth switch tube Q6, third opto-coupler OC3 is nonconducting, detergent liquid level output end DETERGENT through detection circuitry 200 detects the high level signal, and send the high level signal for the controller, the controller can judge that the liquid level of detergent is less than the threshold value of settlement according to the high level signal of detergent liquid level output end DETERGENT output, namely the detection electrode 10 of probe is not in the washing liquid, can send the warning through the controller in order to remind the user in time to put in the detergent in the automatic device 20 of putting in detergent, washing machine's reliability has been improved.
It should be noted that parameters of each component in fig. 1 in the embodiment of the present invention may be set according to actual needs, for example, resistance values of the second resistor R2 to the ninth resistor R9, the eleventh resistor R11, the twelfth resistor R12, and the fifteenth resistor R15 may be 4.7K ohms, resistance values of the tenth resistor R10 and the fourteenth resistor R14 may be 1K ohms, resistance values of the thirteenth resistor R13 and the sixteenth resistor R16 may be 2.2K ohms, and a capacity of the first capacitor C1 may be 0.1 uF.
In summary, according to the detergent detection device of the washing machine of the embodiment of the invention, the alternating voltage is generated by the alternating voltage generation circuit, the generated alternating voltage is applied to the detection electrode, then, whether the two detection ends of the detection electrode are electrified or not is detected by the detection circuit to generate the detection signal, and finally, the liquid level of the detergent in the automatic detergent feeding device is obtained by the controller according to the detection signal. According to the device, the alternating voltage is applied to the two ends of the detection electrode, the formation of an oxide film on the detection electrode can be effectively avoided, the detection failure is avoided, the liquid level of the detergent can be correctly judged, a user is timely reminded of adding the detergent, and the reliability of the washing machine is improved.
Based on the above embodiment, the present invention further provides a washing machine 1000.
Fig. 3 is a block schematic view of a washing machine according to an embodiment of the present invention. As shown in fig. 3, a washing machine 10000 according to an embodiment of the present invention includes the above-described detergent detection device 1000 of the washing machine.
It should be noted that details not disclosed in the washing machine 10000 of the embodiment of the present invention refer to details disclosed in the washing machine detergent detection device 1000 of the embodiment of the present invention, and detailed descriptions thereof are omitted here.
According to the washing machine provided by the embodiment of the invention, by applying the alternating voltage to the two ends of the detection electrode, the washing machine detergent detection device can effectively prevent an oxide film from being formed on the detection electrode, avoid detection failure, further correctly judge the liquid level of the detergent, timely remind a user of adding the detergent, and improve the reliability of the washing machine.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (7)
1. A detergent detection device for a washing machine, comprising:
the detection electrode is arranged in an automatic detergent feeding device of the washing machine;
an alternating voltage generating circuit connected to the detection electrode, the alternating voltage generating circuit being configured to generate an alternating voltage and apply the alternating voltage to the detection electrode;
a detection circuit that generates a detection signal by detecting whether or not a current is applied between two detection terminals of the detection electrode;
the controller is connected with the detection circuit and used for acquiring the liquid level of the detergent in the automatic detergent feeding device according to the detection signal;
wherein the alternating voltage generating circuit comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube, wherein,
a collector of the first switching tube is connected with an emitter of the second switching tube, and a first node is arranged between the collector of the first switching tube and the emitter of the second switching tube;
a collector of the third switching tube is connected with an emitter of the fourth switching tube, and a second node is arranged between the collector of the third switching tube and the emitter of the fourth switching tube;
the emitting electrode of the first switching tube is connected with the emitting electrode of the third switching tube, a third node is arranged between the emitting electrode of the first switching tube and the emitting electrode of the third switching tube, and the third node is connected with a first preset power supply;
a collector electrode of the second switching tube is connected with a collector electrode of the fourth switching tube, a fourth node is arranged between the collector electrode of the second switching tube and the collector electrode of the fourth switching tube, and the fourth node is grounded through a first resistor;
the first node is connected with a first electrifying end of the detection electrode, the second node is connected with a second electrifying end of the detection electrode, and the controller is further used for controlling the switching time sequence from the first switching tube to the fourth switching tube so that the first node and the second node output the alternating voltage;
the detection end of the detection circuit is connected with the fourth node, and the detection circuit is used for detecting the voltage of the fourth node to output the detection signal.
2. The detergent detecting device of a washing machine as claimed in claim 1, wherein said alternating voltage generating circuit further comprises:
a first input end of the first optocoupler is connected to a second preset power supply, a second input end of the first optocoupler is connected to a first trigger signal output end of the controller, a first output end of the first optocoupler is connected with a base electrode of the first switch tube through a second resistor and is connected with a base electrode of the fourth switch tube through a third resistor, and a second output end of the first optocoupler is grounded;
a first input end of the second optocoupler is connected to the second preset power supply, a second input end of the second optocoupler is connected to a second trigger signal output end of the controller, a first output end of the second optocoupler is connected with a base electrode of the second switching tube through a fourth resistor and is connected with a base electrode of the third switching tube through a fifth resistor, and a second output end of the second optocoupler is grounded;
the controller alternately outputs trigger signals through the first trigger signal output end and the second trigger signal output end to control the conduction of the first switching tube and the fourth switching tube and the conduction of the second switching tube and the third switching tube to be alternately carried out.
3. The detergent detecting device for washing machine as claimed in claim 1 or 2, wherein said alternating voltage generating circuit further comprises a sixth resistor, a seventh resistor, an eighth resistor and a ninth resistor, said sixth resistor is connected between the base and the emitter of said first switch tube, said seventh resistor is connected between the base and the emitter of said second switch tube, said eighth resistor is connected between the base and the emitter of said third switch tube, and said ninth resistor is connected between the base and the emitter of said fourth switch tube.
4. The washing machine detergent detection device of claim 1, wherein the detection circuit comprises:
one end of the first capacitor is connected with the fourth node, and the other end of the first capacitor is grounded;
a cathode of the first diode is connected with the fourth node, and an anode of the first diode is connected with the other end of the first capacitor and then grounded;
a second diode, an anode of which is connected to the fourth node, and a cathode of which is connected to the first preset power supply;
the base electrode of the fifth switching tube is connected with the fourth node through a tenth resistor, the emitting electrode of the fifth switching tube is grounded, the collector electrode of the fifth switching tube is connected with the base electrode of the sixth switching tube through an eleventh resistor, the emitting electrode of the sixth switching tube is connected to the first preset power supply, and the collector electrode of the sixth switching tube serves as the output end of the detection circuit.
5. The detergent detecting device for washing machine as claimed in claim 4, wherein said detecting circuit further comprises a twelfth resistor and a thirteenth resistor, said twelfth resistor is connected between the base and the emitter of said fifth switch tube, said thirteenth resistor is connected between the base and the emitter of said sixth switch tube.
6. The washing machine detergent detection device of claim 5, wherein the detection circuit further comprises:
a first input end of the third optocoupler is connected with a collector of the sixth switching tube through a fourteenth resistor, a second input end of the third optocoupler is grounded, a first output end of the third optocoupler is connected with a second preset power supply through a fifteenth resistor, and a second output end of the third optocoupler is grounded;
and one end of the sixteenth resistor is connected with the first output end of the third optocoupler, and the other end of the sixteenth resistor is connected with the controller.
7. A washing machine characterized by comprising a washing machine detergent detection device according to any one of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710174675.1A CN106930056B (en) | 2017-03-22 | 2017-03-22 | Washing machine and detergent detection device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710174675.1A CN106930056B (en) | 2017-03-22 | 2017-03-22 | Washing machine and detergent detection device thereof |
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| CN106930056B true CN106930056B (en) | 2020-04-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107217452B (en) * | 2017-07-21 | 2023-07-25 | 无锡和晶信息技术有限公司 | Automatic detergent delivery system and method |
| CN112695491B (en) * | 2019-10-23 | 2023-07-25 | 无锡飞翎电子有限公司 | Laundry treating apparatus, method of controlling the same, apparatus for controlling the same, and readable medium storing program for controlling the same |
| JP2022026179A (en) * | 2020-07-30 | 2022-02-10 | 青島海爾洗衣机有限公司 | washing machine |
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| CN104775276A (en) * | 2014-01-15 | 2015-07-15 | 无锡飞翎电子有限公司 | Washing machine and liquid detergent detection device for same |
| CN106441500A (en) * | 2015-08-12 | 2017-02-22 | 珠海任驰光电科技有限公司 | Electric-conductive liquid level sensor applied to severe environments |
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| GB2202396B (en) * | 1987-03-14 | 1991-01-30 | Toshiba Kk | Automatic detergent dispenser apparatus having synchronous motor drive |
| JP2002070388A (en) * | 2000-08-28 | 2002-03-08 | Sharp Corp | Door lock device and electric equipment using it |
| CN202030952U (en) * | 2010-12-31 | 2011-11-09 | 无锡小天鹅股份有限公司 | Water level detection circuit for washing machine steam generator |
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| CN102535112A (en) * | 2012-02-16 | 2012-07-04 | 海尔集团公司 | Circuit and method for detecting detergents |
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| CN106930056A (en) | 2017-07-07 |
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Effective date of registration: 20190726 Address after: 214028 No. 18 Changjiang South Road, Wuxi National High-tech Development Zone, Jiangsu Province Applicant after: Wuxi Swan Electrical Appliances Co., Ltd. Address before: 214028 Wuxi Changjiang Road, New District, Jiangsu, No. 18 Applicant before: Wuxi Xiaotianer Co., Ltd. |
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