CN218003972U - Cleaning equipment and cleaning fluid concentration detection circuit - Google Patents
Cleaning equipment and cleaning fluid concentration detection circuit Download PDFInfo
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- CN218003972U CN218003972U CN202222624874.7U CN202222624874U CN218003972U CN 218003972 U CN218003972 U CN 218003972U CN 202222624874 U CN202222624874 U CN 202222624874U CN 218003972 U CN218003972 U CN 218003972U
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Abstract
The utility model provides a cleaning equipment and washing liquid concentration detection circuitry, concentration detection circuitry includes: the output end of the micro-processing unit is used for outputting a control signal; the voltage control circuit is electrically connected with the output end of the micro-processing unit; the first end of the electrode is electrically connected with the voltage control circuit, and the second end of the electrode is placed in the cleaning solution; the micro-processing unit, the voltage control circuit, the electrode and the cleaning liquid form a detection loop under the control signal, the subtractor circuit processes the detected voltage at two ends of the electrode to obtain an output signal and transmits the output signal to the micro-processing unit, and the micro-processing unit detects the concentration of the cleaning liquid according to the output signal. The utility model provides a scheme can the concentration of washing liquid in the real-time detection cleaning equipment, improves detection accuracy and equipment cleaning efficiency.
Description
Technical Field
The utility model relates to a cooking equipment detection circuitry technical field especially indicates a cleaning equipment and washing liquid concentration detection circuitry.
Background
Along with the continuous improvement of living standard of people, the use of the dish-washing machine of the intelligent tableware washing equipment in life is gradually increased, and the dish-washing machine gradually replaces the traditional manpower no matter in a personal family or a restaurant. Food safety is also a focus of social concern, so that a good dishwasher device needs to ensure the cleaning degree of tableware, and the cleaning work of the dishwasher is mainly realized by matching a plurality of functions, mainly comprising high-pressure water flow washing, hot water high-temperature sterilization and chemical agent cleaning and disinfection. The first two ensure that the cleaning in a physical sense ensures the cleanness of the tableware. The chemical agents mainly used in the dish washer comprise a detergent, a drier and a scale remover, which realize the cleaning and sterilization of oil stains through chemical reaction. And the accurate chemical agent that drops into guarantees dish washer on the one hand and to the tableware cleaning performance, and on the other hand guarantees that the residue of chemical agent is minimum. The technical input of the washing agent and the drier used by the existing company is to quantitatively input the washing agent according to the frame number of the dish washing, namely, the liquid medicine added in each cleaning is fixed. The use of fixed dosing of the agent, while ensuring that there is sufficient agent for each wash, has numerous disadvantages: the tableware is less in medicine and too much in medicine, so that the medicine is easy to remain and waste; the tableware contains too little medicine and the cleaning effect is not obvious.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a cleaning equipment and washing liquid concentration detection circuitry to the concentration of washing liquid in the real-time detection cleaning equipment, medicament that concentration is not enough in the timely replenishment washing liquid, improve equipment's cleaning efficiency, the cost is reduced simultaneously.
In order to solve the above technical problem, an embodiment of the utility model provides a washing liquid concentration detection circuit, include:
the output end of the micro-processing unit outputs a control signal;
the voltage control circuit is electrically connected with the output control end of the micro-processing unit;
the first end of the electrode is electrically connected with the voltage control circuit, and the second end of the electrode is arranged in the cleaning solution;
the micro-processing unit, the voltage control circuit, the electrode and the cleaning liquid form a detection loop under the control signal, the subtracter circuit processes the detected voltage of the electrode to obtain an output signal and transmits the output signal to the micro-processing unit, and the micro-processing unit detects the concentration of the cleaning liquid according to the output signal.
Optionally, the microprocessor unit includes: a first control output terminal, a second control output terminal and an input terminal;
the first control output end and the second control output end are used for outputting high-level pulse control signals;
said input terminal is arranged to receive an output signal delivered by said subtractor circuit 3.
Optionally, the voltage control circuit includes: a first voltage control circuit and a second voltage control circuit;
the input end of the first voltage control circuit is electrically connected with the first control output end;
and the input end of the second voltage control circuit is electrically connected with the second control output end.
Optionally, the first voltage control circuit includes:
a first end of the fourth resistor is electrically connected with the first control output end; the second end is electrically connected with the base electrode of the first triode;
the first end of the second resistor is electrically connected with the collector of the first triode, and the second end of the second resistor is electrically connected with a power supply voltage;
and a first end of the first capacitor is electrically connected with the first end of the fourth resistor and the first control output end respectively, and a second end of the first capacitor is electrically connected with the emitter of the first triode and grounded.
Optionally, the second voltage control circuit includes:
a first end of the third resistor is electrically connected with the second control output end, and a second end of the third resistor is electrically connected with a base electrode of the second triode;
the first end of the first resistor is electrically connected with the collector electrode of the second triode, and the second end of the first resistor is electrically connected with a power supply voltage;
and the first end of the second capacitor is respectively electrically connected with the first end of the third resistor and the second control output end, and the second end of the second capacitor is electrically connected with the emitter of the second triode and grounded.
Optionally, the electrode comprises: a first electrode, a second electrode;
the first end of the first electrode is electrically connected with a collector electrode of a first triode in the first voltage control circuit, and the second end of the first electrode is arranged in the cleaning liquid;
and the first end of the second electrode is electrically connected with a collector electrode of a second triode in the second voltage control circuit through a divider resistor, and the second end of the second electrode is arranged in the cleaning liquid.
Optionally, the subtractor circuit includes:
a first operational amplifier;
the second operational amplifier is electrically connected with the output end of the first operational amplifier;
the negative electrode input end of the first operational amplifier is electrically connected with the first end of the second electrode through a fifth resistor, the first operational amplifier processes the input voltage between the first electrode and the second electrode to obtain a first output signal and inputs the first output signal to the second operational amplifier, and the second operational amplifier processes the first output signal to obtain a second output signal and inputs the second output signal to the micro-processing unit.
Optionally, the positive input end of the first operational amplifier is electrically connected to an eighth resistor and a ninth resistor, and is electrically connected to a power supply voltage through the eighth resistor and is grounded through the ninth resistor;
the output end of the first operational amplifier is connected with the negative input end of the first operational amplifier through a sixth resistor and is electrically connected with the positive input end of the second operational amplifier.
Optionally, the output end of the second operational amplifier is electrically connected to the negative input end thereof and the input end of the micro-processing unit, and the positive input end of the second operational amplifier is electrically connected to the output end of the first operational amplifier.
A cleaning device comprises the cleaning liquid concentration detection circuit.
The above technical scheme of the utility model at least include following beneficial effect:
the utility model adopts the scheme that the voltage control circuit is electrically connected with the output end of the micro-processing unit; an electrode electrically connected to the voltage control circuit; and a subtractor circuit electrically connected with the electrode, wherein the electrode is placed in a cleaning liquid in the cleaning equipment, the micro-processing unit, the voltage control circuit, the electrode and the cleaning liquid form a detection loop under a control signal output by the micro-processing unit, the subtractor circuit processes the detected voltages at two ends of the electrode to obtain an output signal and transmits the output signal to the micro-processing unit, and the micro-processing unit detects the concentration of the cleaning liquid according to the output signal so as to detect the concentration of the cleaning liquid in the cleaning equipment in real time, so that the cleaning efficiency of the cleaning equipment is improved.
Drawings
Fig. 1 is a circuit diagram of concentration detection provided by an embodiment of the present invention;
fig. 2 is a schematic diagram of a working circuit of the concentration detection circuit according to an alternative embodiment of the present invention;
fig. 3 is an equivalent circuit diagram of the working principle of the concentration detection circuit according to an alternative embodiment of the present invention;
FIG. 4 is a waveform diagram of a control signal provided by an alternative embodiment of the present invention
Fig. 5 is a waveform diagram of a first output signal provided by an alternative embodiment of the present invention;
fig. 6 is a waveform diagram of a second output signal provided by an alternative embodiment of the present invention.
The reference numbers illustrate: 1. a first voltage control circuit; 2. a second voltage control circuit, 3, a subtractor circuit; 4. cleaning fluid; 5. cleaning the water tank; 11. an output terminal of the first operational amplifier; 12. a negative input terminal of the first operational amplifier; 13. the positive electrode input end of the first operational amplifier; 21. an output of the second operational amplifier; 22. a negative input terminal of a second operational amplifier; 23. the positive input end of the second operational amplifier; r1 and a first resistor; r2 and a second resistor; r3 and a third resistor; r4, a fourth resistor; r5 and a fifth resistor; r6 and a sixth resistor; r8 and an eighth resistor; r9 and a ninth resistor; rx, a divider resistor; q1, a first triode; q2 and a second triode; u1, a first operational amplifier; u2, a second operational amplifier; A. a first electrode; B. a second electrode; c1, a first capacitor; c2 and a second capacitor.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As shown in fig. 1, an embodiment of the present invention provides a cleaning liquid concentration detection circuit, including: a micro-processing unit; the voltage control circuit is electrically connected with the output control end of the microprocessing unit; the voltage control circuit is electrically connected with the voltage control circuit, and the subtractor circuit is respectively electrically connected with the electrode and the microprocessing unit; the electrode is arranged in a cleaning solution in a cleaning device, the micro-processing unit, the voltage control circuit, the electrode and the cleaning solution form a closed detection loop under a control signal output by the micro-processing unit, the subtractor circuit 3 processes the detected voltage at two ends of the electrode to obtain an output signal and transmits the output signal to the micro-processing unit, and the micro-processing unit detects the concentration of the cleaning solution according to the output signal. In this embodiment, the electrode is a sensor-type metal electrode, a first end of the electrode is placed in the cleaning solution of the cleaning device, and a second end of the electrode is electrically connected to the voltage control circuit; the output end of the micro-processing unit is electrically connected with the voltage control circuit; the micro-processing unit, the voltage control circuit, the electrode and the cleaning liquid form a closed loop; the microprocessor unit may be an MCU or a single-chip microcomputer, or other processors capable of implementing control and processing;
further, the micro processing unit may include: a first CONTROL output terminal CONTROL1, a second CONTROL output terminal CONTROL2 and an input terminal; as shown in fig. 4, the first control output terminal and the second control output terminal are configured to output a high-level pulse control signal, so as to prevent the metal electrode from being electrolyzed in the cleaning solution after being powered on, and prevent the detection result from being influenced by the consumption of the electrode and the increase of charged ions in water after the electrode is electrolyzed, so as to improve the detection accuracy;
the input end is used for receiving the output signal transmitted by the subtracter circuit 3 and detecting the concentration of the cleaning liquid according to the output signal.
When the concentration detection is carried out, the micro-processing unit inputs a control signal to the voltage control circuit through a first control second control output end, the control signal is transmitted to the whole detection loop through the voltage control circuit, because the electrode is placed in a cleaning solution, and a cleaning solution between the electrodes can be regarded as an equivalent resistance of the whole detection loop, the voltage at two ends of the electrode is detected to be equal to the voltage of the cleaning solution, the change of the concentration of the cleaning solution causes the change of the equivalent resistance between the electrodes, the voltage drop of the electrode is changed, and the voltage is transmitted to the micro-processing unit, so that the detection of the concentration of the cleaning solution in the cleaning equipment is realized;
through the micro-processing unit, the electrode, the voltage control circuit and the subtracter circuit can detect the concentration of the cleaning liquid in the cleaning equipment in real time, and further the micro-processing unit can judge the dosage of the injected medicament according to the concentration of the cleaning liquid in the water tank of the current cleaning equipment so as to improve the cleaning efficiency of the cleaning equipment.
In an optional embodiment of the present invention, it is right that the voltage control circuit is described, the voltage control circuit includes: the voltage control circuit comprises a first voltage control circuit 1 and a second voltage control circuit, wherein the input end of the first voltage control circuit 1 is electrically connected with the first control output end, and the input end of the second voltage control circuit 2 is electrically connected with the second control output end.
Further, the first voltage control circuit 1 will be explained, and the first voltage control circuit 1 includes: a first end of the fourth resistor R4 is electrically connected to the first control output end, and a second end of the fourth resistor R4 is electrically connected to the base of the first triode Q1; a first end of the second resistor R2 is electrically connected to the collector of the first triode Q1, and a second end of the second resistor R2 is electrically connected to a power supply voltage; and a first end of the first capacitor C1 is electrically connected with a first end of the fourth resistor R4 and the first control output end respectively, and a second end of the first capacitor C1 is electrically connected with the emitter of the first triode Q1 and grounded.
Further, the second voltage control circuit 2 is explained, and the second voltage control circuit 2 includes: a third resistor R3, a first end of the third resistor R3 being electrically connected to the second control output terminal; the second end of the third resistor R3 is electrically connected with the base electrode of the second triode Q2; a first resistor R1, a first end of the first resistor R1 being electrically connected to a collector of the second transistor Q2, a second end of the first resistor R1 being electrically connected to a supply voltage; and a first end of the second capacitor C2 is electrically connected with a first end of the third resistor R3 and the second control output end respectively, and a second end of the second capacitor C2 is electrically connected with an emitter of the second triode Q2 and grounded.
In this embodiment, the third resistor R3 and the fourth resistor R4 may be current-limiting resistors, and when the first control output end and the second control output end of the microprocessor perform concentration detection, both output high-level pulse signals, the microprocessor unit, the voltage control circuit, the electrode and the cleaning solution form a closed detection loop under the pulse signals, at this time, the first triode Q1 and the second triode Q2 are in a conduction state, and the third resistor R3 and the fourth resistor R4 perform a current-limiting function, so as to avoid damaging the first triode Q1 and the second triode Q2; the first resistor R1 and the second resistor R2 can be kiloohm resistors and can adjust the voltage dividing resistor Rx;
in an optional embodiment of the present invention, the electrode includes: a first electrode A and a second electrode B; the first end of the first electrode A is electrically connected with the collector electrode of a first triode Q1 in the first voltage control circuit 1, and the second end of the first electrode A is placed in the cleaning liquid; a first end of the second electrode B is electrically connected with a collector electrode of a second triode Q2 in the second voltage control circuit 2 through a divider resistor Rx, and a second end of the second electrode B is arranged in the cleaning liquid;
as shown in fig. 2-3, in this embodiment, a first end of the first electrode a is electrically connected to the first voltage control circuit 1, and a second end thereof is inserted into the cleaning solution; the first end of the second electrode B is electrically connected with the second voltage control circuit 2 through a voltage division resistor Rx, and the second end of the second electrode B is inserted into the cleaning solution; the micro-processing unit, the first voltage control circuit 1, the first electrode A, the second electrode B, the second voltage control circuit 2 and the cleaning liquid form a closed detection loop, when concentration detection is carried out, a first control output end and a second control output end of the micro-processing unit both output high-level pulse signals, and the voltage of the detection loop is formed through the voltage control circuit;
when the concentration is to be detected, the concentration is measured,because the cleaning equipment achieves the cleaning purpose through the chemical reaction of cleaning liquid (chemical agent dissolution), more charged ions are contained in the cleaning liquid, when the microprocessor inputs preset detection voltage to the loop through the voltage control circuit to be direct current voltage, the microprocessor can prompt the first electrode A and the second electrode B to carry out partial electrolysis on the cleaning liquid, the charged ions in the water after the cleaning liquid is electrolyzed influence the detection result more, so that the data is invalid, therefore, the first control output end and the second control output end of the microprocessing unit both need to output high-level pulse signals, the voltage of the detection loop is formed through the voltage control circuit, and the influence caused by the electrolysis is further reduced; when the first control output end and the second control output end both output high-level pulse signals, the micro-processing unit also reads an output value at the same time, at the moment, the two triodes are conducted, the closed loop starts to detect, the current in the closed loop flows to an equivalent circuit diagram as shown in fig. 3, the pulse signals are input into the second electrode B through the second control output end, return to the first electrode A through the cleaning liquid loop, and then are grounded through the first control output end. According to ohm's law:
wherein, U ADC2 Is the voltage between the first electrode A and the second electrode B in a closed loop, R L Is the equivalent resistance between the first electrode A and the second electrode B, U is the preset detection voltage according to the equivalent resistance R L The concentration of the cleaning fluid can be obtained according to the relation with the concentration;
the first capacitor C1 and the second capacitor C2 can be filter capacitors, so that the influence of the square waves on the closed loop is reduced and the working performance of the closed loop is stabilized during concentration detection.
In an optional embodiment of the present invention, it is right that subtractor circuit 3 is explained, subtractor circuit 3 includes:
a first operational amplifier U1; the second operational amplifier U2 is electrically connected with the output end of the first operational amplifier; the negative electrode input end (inverting input end) of the first operational amplifier U1 is electrically connected with the first end of the second electrode B through a fifth resistor R5, the first operational amplifier U1 processes the voltage between the first electrode A and the second electrode B to obtain a first output signal, the first output signal is input to the second operational amplifier U2, and the second operational amplifier U2 processes the first output signal to obtain a second output signal and inputs the second voltage output signal to the micro-processing unit.
Further, the positive input end (non-inverting input end) of the first operational amplifier U1 is electrically connected to the eighth resistor R8 and the ninth resistor R9 respectively, is electrically connected to the power supply voltage through the eighth resistor R8, and is grounded through the ninth resistor R9; the output end of the first operational amplifier U1 is connected with the negative input end of the first operational amplifier U1 through a sixth resistor and is electrically connected with the positive input end of the second operational amplifier U2.
Further, an output end of the second operational amplifier U2 is electrically connected to a negative input end (inverting input end) thereof and the microprocessor unit, respectively, and a positive input end (non-inverting input end) of the second operational amplifier U2 is electrically connected to an output end of the first operational amplifier U1.
In this embodiment, the input terminal of the subtractor circuit 3 and the voltage dividing resistor R X The output end of the subtracter circuit 3 is electrically connected with the input end of the micro-processing unit, and the subtracter circuit 3 processes the voltage between the first electrode A and the second electrode B and inputs the processed voltage into the micro-processing unit so as to eliminate the detection error caused by unstable power supply; the micro-processing unit can obtain the concentration of the cleaning fluid according to the processing result, and further control the dosage of the medicament for the cleaning equipment;
the fifth resistor R5, the sixth resistor R6, the eighth resistor R8 and the ninth resistor R9 can be matching resistors, and the matching resistors R5= R6 and R8= R9 are mainly used for transmission lines to ensure that high-level pulse signals can be transmitted to load points and avoid signal reflection when the calculation of the subtracter is ensured, so that the energy benefit is improved, and the operational amplifier can work normally and stably;
the voltage division U between the first electrode A and the second electrode B is realized due to the pulse signal with fixed frequency input in the detection loop ADC2 If the read signal is a pulse signal, the output end of the first operational amplifier U1 outputs the pulse signal; because the output end and the negative electrode input end of the first operational amplifier U1 are electrically connected, the first operational amplifier U1 forms a follower in the whole circuit, and the equivalent voltage between cleaning liquids in the circuit can be fed back in real time; because the positive input end of the second operational amplifier U2 is a fixed voltage VCC _ R, the input voltage of the negative input end is the voltage division U between the electrodes ADC2 The first arithmetic unit U1 is used for comparing the fixed voltage VCC _ R with the divided voltage U ADC2 Carrying out subtraction processing to obtain a first output signal, and if the input in the detection loop is an alternating-current square wave signal, then U ADC2 The signal read by voltage division is a square wave, and the output of the pin 1 of U1 is a square wave. The in-phase end of U2 is fixed voltage, and the reverse end inputs U ADC2 The output of U2 is VCC _ R-U ADC2 . And a pin 1 of the U1 is connected with the equidirectional end of the U2, a pin 2 of the U2 is connected with output to form feedback, the U2 is built into a follower, the follower is added for impedance conversion, and simultaneously, the ADC _ IN output signal is subjected to logic level switching.
Because the output end of the first operational amplifier U1 is electrically connected to the positive input end of the second operational amplifier U2, the negative input end of the second operational amplifier U2 is electrically connected to the output end thereof and forms feedback, the second operational amplifier U2 may also form a follower, which can perform impedance transformation, and at the same time, can perform logic level switching on the input first voltage to obtain a second output signal ADC _ IN, as shown IN fig. 6, and transmit the second output signal ADC _ IN to the microprocessor unit, thereby facilitating the subsequent processing of the microprocessor unit; due to read U ADC2 The value fluctuation is large, so the data needs to be further processed, and the power supplies VCC _ R and U in the loop are connected ADC2 Using an operational amplifier circuit to perform subtraction operation to counteract detection errors caused by unstable power supply, namely ADC _ IN = VCC _ R-U ADC2 。
The embodiment of the utility model provides a cleaning equipment is still provided, include as above-mentioned any one embodiment washing liquid concentration detection circuitry.
In this embodiment, the cleaning apparatus includes the cleaning solution concentration detection circuit according to any one of the above embodiments, which can detect the concentration of the cleaning solution in the cleaning water tank in real time, so as to control the amount of the cleaning agent and improve the cleaning efficiency;
when the cleaning equipment needs to be cleaned, the specific application of the cleaning liquid concentration detection circuit is as follows:
in the initialization state of the micro-processing unit, a first CONTROL output end CONTROL1 and a second CONTROL output end CONTROL2 both output low levels; at the moment, the first triode Q1 and the second triode Q2 are both in a cut-off state, and the detection circuit stops working;
when concentration is detected, the voltage divider resistor R is divided X Adjusting, wherein the first CONTROL output end CONTROL1 and the second CONTROL output end CONTROL2 both output high-level and fixed-frequency pulse signals, the first triode Q1 and the second triode Q2 are both in a conducting state, the CONTROL _1 of the collector end of the first triode Q1 is arranged at a low level, and the ADC1 is grounded to form a CONTROL loop;
after the micro processing unit (MCU) reads the output parameters of the first CONTROL output end and the second CONTROL output end, the whole detection circuit starts to work, at the moment, the current in the detection loop flows to the equivalent circuit diagram, referring to fig. 3, the square wave alternating current signal is input into the second electrode B through the second CONTROL output end CONTROL2, returns to the first electrode A through the cleaning liquid loop, and returns to the ground through the first CONTROL output end CONTROL 1. According to ohm's law:
partial pressure U in the circuit ADC2 The voltage between the two electrodes is used to obtain the concentration of the cleaning liquid.
The read voltage division U is realized by pulse signal input into the detection loop ADC2 The pulse signal has large value fluctuation, so the data needs to be further processed, and the power source VCC _ R and the voltage division U in the loop are connected ADC2 Using subtracter circuit to make subtraction operation to counteract detection resulted from unstable power supplyMeasuring errors;
the positive terminal of the first operational amplifier U1 is a fixed voltage VCC _ R, and the negative terminal input is a divided voltage U ADC2 Then the output of the first operational amplifier U1 is VCC _ R-U ADC2 (ii) a Because the output end of the first operational amplifier U1 is connected to the positive input end of the second operational amplifier U2, the negative input end of the second operational amplifier U2 is electrically connected to the output end to form feedback, the second operational amplifier U2 forms a follower, and performs logic level switching on the first output signal input by the first operational amplifier U1 to obtain a second output signal, as shown in fig. 6, which is convenient for the micro-processing unit to process;
the micro-processing unit receives the second output signal ADC _ IN and processes and converts the second output signal ADC _ IN, so that the concentration of the cleaning liquid IN the cleaning water tank is identified to form closed-loop control, and the micro-processing unit reads data for many times and averages the data to ensure the accuracy of the data. Due to read U ADC2 The value fluctuation is large, therefore, the data needs to be further processed, and the power supplies VCC _ R and U in the loop are connected ADC2 Using an operational amplifier circuit to perform subtraction operation to counteract detection errors caused by unstable power supply, namely ADC _ IN = VCC _ R-U ADC2 。
The above embodiment of the utility model, can real-time detection cleaning equipment wash the washing liquid concentration in the water tank through microprocessing unit, voltage control circuit and electrode sensor, and then can the accurate control put in the quantity of medicament according to the concentration that records, further improve cleaning equipment's cleaning efficiency.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A cleaning liquid concentration detection circuit, characterized by comprising:
the output end of the micro-processing unit outputs a control signal;
the voltage control circuit is electrically connected with the output end of the micro-processing unit;
the first end of the electrode is electrically connected with the voltage control circuit, and the second end of the electrode is placed in the cleaning solution;
the input end of the subtractor circuit (3) is electrically connected with the first end of the electrode, and the output end of the subtractor circuit (3) is electrically connected with the input end of the microprocessing unit;
the micro-processing unit, the voltage control circuit, the electrode and the cleaning liquid form a detection loop under the control signal, the subtracter circuit (3) processes the detected voltage at two ends of the electrode to obtain an output signal and transmits the output signal to the micro-processing unit, and the micro-processing unit detects the concentration of the cleaning liquid according to the output signal.
2. The cleaning liquid concentration detection circuit according to claim 1, wherein the micro-processing unit includes: a first control output terminal, a second control output terminal and an input terminal;
the first control output end and the second control output end are used for outputting high-level pulse control signals;
the input end is used for receiving the output signal transmitted by the subtracter circuit (3).
3. The cleaning liquid concentration detection circuit according to claim 2, wherein the voltage control circuit includes: a first voltage control circuit (1) and a second voltage control circuit (2);
the input end of the first voltage control circuit (1) is electrically connected with the first control output end;
and the input end of the second voltage control circuit (2) is electrically connected with the second control output end.
4. The cleaning liquid concentration detection circuit according to claim 3, wherein the first voltage control circuit (1) includes:
a first end of the fourth resistor (R4) is electrically connected with the first control output end, and a second end of the fourth resistor (R4) is electrically connected with a base electrode of the first triode (Q1);
a second resistor (R2), a first end of the second resistor (R2) is electrically connected with the collector of the first triode (Q1), and a second end is electrically connected with a power supply voltage;
and a first end of the first capacitor (C1) is electrically connected with a first end of the fourth resistor (R4) and the first control output end respectively, and a second end of the first capacitor (C1) is electrically connected with an emitting electrode of the first triode (Q1) and grounded.
5. A cleaning liquid concentration detection circuit according to claim 3, wherein the second voltage control circuit (2) comprises:
a first end of the third resistor (R3) is electrically connected with the second control output end, and a second end of the third resistor (R3) is electrically connected with a base electrode of a second triode (Q2);
the first end of the first resistor (R1) is electrically connected with the collector of the second triode (Q2), and the second end of the first resistor (R1) is electrically connected with a power supply voltage;
and a first end of the second capacitor (C2) is electrically connected with a first end of the third resistor (R3) and the second control output end respectively, and a second end of the second capacitor (C2) is electrically connected with an emitter of the second triode (Q2) and grounded.
6. The cleaning liquid concentration detection circuit according to claim 3, wherein the electrode includes: a first electrode (A), a second electrode (B);
the first end of the first electrode (A) is electrically connected with the collector electrode of a first triode (Q1) in the first voltage control circuit (1), and the second end of the first electrode (A) is placed in the cleaning solution;
and the first end of the second electrode (B) is electrically connected with the collector electrode of a second triode (Q2) in the second voltage control circuit (2) through a divider resistor (Rx), and the second end of the second electrode (B) is arranged in the cleaning solution.
7. The cleaning liquid concentration detection circuit according to claim 6, wherein the subtractor circuit (3) includes:
a first operational amplifier (U1);
a second operational amplifier (U2) electrically connected to an output of the first operational amplifier;
the negative electrode input end of the first operational amplifier (U1) is electrically connected with the first end of the second electrode (B) through a fifth resistor (R5); the first operational amplifier (U1) processes the voltage between the first electrode (A) and the second electrode (B) to obtain a first output signal, and inputs the first output signal to the second operational amplifier (U2), and the second operational amplifier (U2) processes the first output signal to obtain a second output signal, and inputs the second output signal to the micro-processing unit.
8. The cleaning liquid concentration detection circuit according to claim 7,
the positive input end of the first operational amplifier (U1) is respectively electrically connected with an eighth resistor (R8) and a ninth resistor (R9), is electrically connected with a power supply voltage through the eighth resistor (R8), and is grounded through the ninth resistor (R9);
the output end of the first operational amplifier (U1) is connected with the negative input end of the first operational amplifier through a sixth resistor (R6) and is electrically connected with the positive input end of the second operational amplifier (U2).
9. The cleaning liquid concentration detection circuit according to claim 7,
the output end of the second operational amplifier (U2) is electrically connected with the negative input end of the second operational amplifier and the input end of the micro-processing unit respectively, and the positive input end of the second operational amplifier (U2) is electrically connected with the output end of the first operational amplifier (U1).
10. A cleaning apparatus characterized by comprising the cleaning liquid concentration detection circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222624874.7U CN218003972U (en) | 2022-09-30 | 2022-09-30 | Cleaning equipment and cleaning fluid concentration detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222624874.7U CN218003972U (en) | 2022-09-30 | 2022-09-30 | Cleaning equipment and cleaning fluid concentration detection circuit |
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| Publication Number | Publication Date |
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| CN218003972U true CN218003972U (en) | 2022-12-09 |
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| CN202222624874.7U Active CN218003972U (en) | 2022-09-30 | 2022-09-30 | Cleaning equipment and cleaning fluid concentration detection circuit |
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| Country | Link |
|---|---|
| CN (1) | CN218003972U (en) |
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- 2022-09-30 CN CN202222624874.7U patent/CN218003972U/en active Active
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