Solution detection circuit structure

Abstract

The utility model discloses a solution detection circuit structure which comprises an excitation unit, a detection unit, a signal processing unit and a control unit, the output end of the square-wave generator of the excitation unit is connected with the output end of the detection unit; the detection unit is provided with a first detection electrode and a second detection electrode; and the microprocessor is respectively connected with three output ends of the detection unit through a first signal processing circuit, a second signal processing circuit and a third signal processing circuit of the signal processing unit. The utility model has the advantage of high detection precision.

Description

Technical Field

[0001] The utility model relates to the field of sodium hypochlorite generators, in particular to a solution detection circuit structure. Background Art

[0002] A sodium hypochlorite generator electrolyzes a salt solution, converting the salt (sodium chloride) in the solution into sodium hypochlorite, which has a disinfecting effect. The electrolysis efficiency of existing sodium hypochlorite generators is significantly affected by the salt concentration of the solution. Therefore, many existing sodium hypochlorite generators are equipped with a salt concentration detection circuit. This circuit detects the conductivity of the salt solution and converts it into salt concentration. The generator then adjusts the electrolysis current based on the current salt concentration. However, existing salt concentration detection circuits have low conductivity detection accuracy, resulting in low salt concentration detection accuracy and large detection errors.

[0003] In view of the existence of the above problems, it is necessary to study a solution detection circuit structure, which has the advantage of high detection accuracy. Utility Model Content

[0004] The purpose of the utility model is to provide a solution detection circuit structure, which has the advantage of high detection accuracy.

[0005] In order to achieve the above objectives, the solution of the present invention is:

[0006] A solution detection circuit structure, which includes an excitation unit, a detection unit, a signal processing unit and a control unit; the excitation unit includes a square wave generator for generating a square wave signal, the square wave signal switches between a high level and a zero level, and the output end of the square wave generator is connected to the excitation end of the detection unit; the detection unit includes a first detection electrode, a second detection electrode, a power resistor, a first detection branch, a second detection branch and a third detection branch; the first detection branch includes a first resistor and a first capacitor connected in series, the first end of the first detection branch is connected to the first detection electrode, the second end of the second detection branch is grounded, and the common node of the first resistor and the first capacitor is connected to the first output end of the detection unit; the second detection branch includes a second resistor and a third resistor connected in series, the first end of the second detection branch is connected to the first end of the power resistor and the second detection electrode, the second end of the second detection branch is grounded, the second resistor and The common node of the third resistor is connected to the second output end of the detection unit; the third detection branch includes a fourth resistor and a fifth resistor connected in series, the first end of the third detection branch is connected to the first detection electrode, the second end of the third detection branch is grounded, and the common node of the fourth resistor and the fifth resistor is connected to the third output end of the detection unit; the second end of the power resistor is connected to the excitation end of the detection unit; the signal processing unit includes a first signal processing circuit, a second signal processing circuit and a third signal processing circuit, the input end of the first signal processing circuit is connected to the first output end of the detection unit, the input end of the second signal processing circuit is connected to the second output end of the detection unit, and the input end of the third signal processing circuit is connected to the third output end of the detection unit; the control unit includes a microprocessor, and the microprocessor is respectively connected to the output end of the first signal processing circuit, the output end of the second signal processing circuit and the output end of the third signal processing circuit.

[0007] The first signal processing circuit, the second signal processing circuit and the third signal processing circuit of the signal processing unit adopt signal filtering and amplifying circuits.

[0008] The solution detection circuit structure further includes a temperature probe, which is connected to the microprocessor.

[0009] The first detection electrode and the second detection electrode are made of one of titanium, copper, titanium alloy or stainless steel.

[0010] During one cycle of the square wave signal generated by the square wave generator, the high level duration of the square wave signal is 0.01ms to 500ms, and the high level duration of the square wave signal is less than or equal to the low level duration.

[0011] The high-level voltage of the square wave signal generated by the square wave generator is 3V~48V.

[0012] The solution detection circuit structure further includes a wireless communication unit and / or a display unit connected to the microprocessor.

[0013] The solution detection circuit structure further includes a power supply unit, which is connected to the power supply end of the square wave generator and the power supply end of the microprocessor respectively.

[0014] The first end of the first resistor is connected to the first end of the first detection branch, the second end of the first resistor and the first end of the first capacitor are connected to the first output end of the detection unit, and the second end of the first capacitor is connected to the second end of the first detection branch.

[0015] The first end of the first capacitor is connected to the first end of the first detection branch, the second end of the first capacitor and the first end of the first resistor are connected to the first output end of the detection unit, and the second end of the first resistor is connected to the second end of the first detection branch.

[0016] After adopting the above scheme, when the present invention is used to detect the salt concentration of a salt solution, the first detection electrode and the second detection electrode are both placed in the salt solution to be detected, the square wave generator of the excitation unit generates a square wave signal and outputs it to the detection unit, thereby generating a voltage difference between the first detection electrode and the second detection electrode, and the microprocessor obtains the output voltages of the first output end, the second output end, and the third output end of the detection unit through the first signal processing circuit, the second signal processing circuit, and the third signal processing circuit of the signal processing unit. Then, the microprocessor calculates the conductivity between the first detection electrode and the second detection electrode based on the resistance values ​​of the first resistor, the second resistor, the third resistor, the fourth resistor, and the fifth resistor. The microprocessor then converts the conductivity into the corresponding salt concentration, thereby realizing the detection of the salt concentration of the salt solution.

[0017] The square wave signal generated by the square wave generator of the present invention switches back and forth between a high level and a zero level. When the square wave signal is at a high level, the square wave signal generated by the square wave generator switches back and forth between a high level and a zero level. When the square wave signal is at a high level, the first detection electrode is at a low level and the second detection electrode is at a high level. When the square wave signal is at a low level, the first capacitor discharges, causing the first detection electrode to be at a high level and the second detection electrode to be at a low level. In this way, the first detection electrode and the second detection electrode will not produce polarization, thereby avoiding changes in the surface electrochemical characteristics of the first detection electrode and the second detection electrode due to polarization. At the same time, it can also reduce the accumulation of scale on the first detection electrode and the second detection electrode to change the electrode constant, thereby effectively ensuring the detection accuracy of the conductivity, and thus ensuring the detection accuracy of the salt concentration.

[0018] In the present invention, within one cycle of the square wave signal generated by the square wave generator, the high-level duration of the square wave signal is 0.01ms to 500ms, and the high-level duration of the square wave signal is less than or equal to the low-level duration. This short high-level duration allows the first capacitor to effectively discharge, ensuring that polarization does not occur between the first and second detection electrodes. Furthermore, the high-level voltage of the square wave signal generated by the square wave generator is 3V to 48V, resulting in a low current and short power-on duration between the first and second detection electrodes. This ensures that the first and second detection electrodes substantially do not electrolyze sodium chloride, further ensuring that polarization does not occur between the first and second detection electrodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the first embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the second embodiment of the present invention.

[0021] Description of labels:

[0022] Excitation unit 1, square wave generator 11,

[0023] Detection unit 2, first detection electrode 21, second detection electrode 22, power resistor 23, first detection branch 24, first resistor 241, first capacitor 242, second detection branch 25, second resistor 251, third resistor 252, third detection branch 26, fourth resistor 261, fifth resistor 262,

[0024] Signal processing unit 3, first signal processing circuit 31, second signal processing circuit 32, third signal processing circuit 33,

[0025] Control unit 4, microprocessor 41,

[0026] Temperature probe 5,

[0027] wireless communication unit 6,

[0028] Display unit 7,

[0029] Power supply unit 8,

[0030] Saline solution A. DETAILED DESCRIPTION

[0031] In order to further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0032] Example 1:

[0033] Cooperate Figure 1As shown, in the first embodiment of the present invention, a solution detection circuit structure of the present invention includes an excitation unit 1, a detection unit 2, a signal processing unit 3 and a control unit 4; wherein the excitation unit 1 includes a square wave generator 11 for generating a square wave signal, the square wave signal is switched between a high level and a zero level, and the output end of the square wave generator 11 is connected to the excitation end of the detection unit 2; the detection unit 2 includes a first detection electrode 21, a second detection electrode 22, a power resistor 23, a first detection branch 24, a second detection branch 25 and a third detection branch 26; the first detection branch 24 includes a first resistor 241 and a first capacitor 242 connected in series, a first end of the first detection branch 24 is connected to the first detection electrode 21, a second end of the second detection branch 25 is grounded, and a common node of the first resistor 241 and the first capacitor 242 is connected to the first output end of the detection unit 2; the second detection branch 25 includes a second resistor 251 and a third resistor 252 connected in series, a first end of the second detection branch 25 is connected to the first end of the power resistor 23 and the second detection electrode 22, and the second detection branch 2 5 is grounded, and the common node of the second resistor 251 and the third resistor 252 is connected to the second output end of the detection unit 2; the third detection branch 26 includes a fourth resistor 261 and a fifth resistor 262 connected in series, the first end of the third detection branch 26 is connected to the first detection electrode 21, the second end of the third detection branch 26 is grounded, and the common node of the fourth resistor 261 and the fifth resistor 262 is connected to the third output end of the detection unit 2; the second end of the power resistor 23 is connected to the excitation end of the detection unit 2; the signal processing unit 3 includes a first signal processing circuit 31, a second signal processing circuit 32 and a third signal processing circuit 33, the input end of the first signal processing circuit 31 is connected to the first output end of the detection unit 2, the input end of the second signal processing circuit 32 is connected to the second output end of the detection unit 2, and the input end of the third signal processing circuit 33 is connected to the third output end of the detection unit 2; the control unit 4 includes a microprocessor 41, and the microprocessor 41 is respectively connected to the output end of the first signal processing circuit 31, the output end of the second signal processing circuit 32 and the output end of the third signal processing circuit 33.

[0034] The operating principle of the present invention is as follows: when used to detect the salt concentration of a saline solution A, the first detection electrode 21 and the second detection electrode 22 are both placed in the saline solution A to be detected. The square wave generator 11 of the excitation unit 1 generates a square wave signal and outputs it to the detection unit 2, thereby generating a voltage difference between the first detection electrode 21 and the second detection electrode 22. The microprocessor 41 obtains the output voltages of the first, second, and third output terminals of the detection unit 2 through the first signal processing circuit 31, the second signal processing circuit 32, and the third signal processing circuit 33 of the signal processing unit 3. The microprocessor 41 then calculates the conductivity between the first detection electrode 21 and the second detection electrode 22 based on the resistance values ​​of the first resistor 241, the second resistor 251, the third resistor 252, the fourth resistor 261, and the fifth resistor 262. The microprocessor 41 then converts this conductivity into a corresponding salt concentration, thereby detecting the salt concentration of the saline solution A. The conversion of the conductivity into a corresponding salt concentration is conventional in the art and will not be further elaborated here.

[0035] In the first embodiment of the present invention, the first end of the first resistor 241 is connected to the first end of the first detection branch 24, the second end of the first resistor 241 and the first end of the first capacitor 242 are connected to the first output end of the detection unit 2, and the second end of the first capacitor 242 is connected to the second end of the first detection branch 24; the first end of the second resistor 251 is connected to the first end of the second detection branch 25, the second end of the second resistor 251 and the first end of the third resistor 252 are connected to the second output end of the detection unit 2, and the second end of the third resistor 252 is connected to the second end of the first detection branch 24. The first end of the fourth resistor 261 is connected to the first end of the second detection branch 25, the second end of the fourth resistor 261 and the first end of the fifth resistor 262 are connected to the second output end of the detection unit 2, and the second end of the fifth resistor 262 is connected to the second end of the first detection branch 24. After such an arrangement, the calculation formula of the conductivity between the first detection electrode 2121 and the second detection electrode 2222 of the present invention is:

[0036] G={(R4+R5)*U3 / (R5*R1)-U1 / R1} / {(R2+R3)*U2 / R3 - (R4+R5)*U3 / R5};

[0037] Among them, G is the conductivity between the first detection electrode 21 and the second detection electrode 22, U1 is the output voltage of the first output end of the detection unit 2, U2 is the output voltage of the second output end of the detection unit 2, U3 is the voltage of the third output end of the detection unit 2, R1 is the resistance value of the first resistor 241, R2 is the resistance value of the second resistor 251, R3 is the resistance value of the third resistor 252, R4 is the resistance value of the fourth resistor 261, and R5 is the resistance value of the fifth resistor 262.

[0038] In the first embodiment of the present invention, the square wave signal generated by the square wave generator 11 switches back and forth between a high level and a zero level. When the square wave signal is at a high level, the first detection electrode 21 is at a low level and the second detection electrode 22 is at a high level. When the square wave signal is at a low level, the first capacitor 242 discharges, causing the first detection electrode 21 to be at a high level and the second detection electrode 22 to be at a low level. This prevents polarization of the first detection electrode 21 and the second detection electrode 22, thereby preventing changes in the surface electrochemical properties of the first detection electrode 21 and the second detection electrode 22 due to polarization. Furthermore, it also reduces the accumulation of scale on the first detection electrode 21 and the second detection electrode 22, thereby changing the electrode constant. This effectively ensures the accuracy of conductivity detection and, in turn, the accuracy of salt concentration detection. The present invention measures the conductivity between the first detection electrode 21 and the second detection electrode 22 when the square wave signal is at a high level, thereby ensuring the voltage stability of the first detection electrode 21 and the second detection electrode 22 and ensuring detection accuracy.

[0039] In the first embodiment of the present invention, within one cycle of the square wave signal generated by the square wave generator 11, the high-level duration of the square wave signal is 0.01ms to 500ms, and the high-level duration of the square wave signal is less than or equal to the low-level duration. This short high-level duration allows the first capacitor 242 to effectively discharge, thereby ensuring that polarization does not occur between the first detection electrode 21 and the second detection electrode 22. Furthermore, the high-level voltage of the square wave signal generated by the square wave generator 11 is 3V to 48V. This results in a low current and a short power-on duration between the first detection electrode 21 and the second detection electrode 22, which essentially prevents the first detection electrode 21 and the second detection electrode 22 from electrolyzing sodium chloride, further ensuring that polarization does not occur between the first detection electrode 21 and the second detection electrode 22.

[0040] In embodiment 1 of the present invention, the first signal processing circuit 31, the second signal processing circuit 32 and the third signal processing circuit 33 of the signal processing unit 3 adopt a signal filtering and amplifying circuit. The signal filtering and amplifying circuit can filter and amplify the signal to ensure that the microprocessor 41 can accurately obtain the output voltages of the first output end, the second output end and the third output end of the detection unit 2; the signal filtering and amplifying circuit is a commonly used circuit and will not be elaborated here.

[0041] In embodiment 1 of the present invention, the material of the first detection electrode 21 and the second detection electrode 22 is one of titanium, copper, titanium alloy or stainless steel, so that the first detection electrode 21 and the second detection electrode 22 have good corrosion resistance, ensuring the service life of the first detection electrode 21 and the second detection electrode 22.

[0042] In the first embodiment of the present invention, the present invention further includes a temperature probe 5, which is connected to a microprocessor 41. The microprocessor 41 detects the temperature of the salt solution A through the temperature probe 5. The microprocessor 41 converts the conductivity between the first detection electrode 21 and the second detection electrode 22 into a corresponding salt concentration based on the temperature of the salt solution A. This conversion result is more accurate, effectively improving the detection accuracy of the salt concentration.

[0043] In the first embodiment of the present invention, the present invention may further include a wireless communication unit 6 and a display unit 7 connected to the microprocessor 41. The wireless communication unit 6 may be a Bluetooth communication circuit or a WiFi communication circuit. The wireless communication unit 6 enables the microprocessor 41 to communicate wirelessly with an external smart terminal (such as a smart phone or a tablet computer), making it convenient for the user to obtain the detection results of the entire solution detection circuit structure through the smart terminal; and the display unit 7 may be an LCD display circuit or a digital tube display circuit. The microprocessor 41 can display the detection results through the display unit 7, making it convenient for the user to intuitively understand the detection results.

[0044] In the first embodiment of the present invention, the present invention further includes a power supply unit 8, which is respectively connected to the power supply end of the square wave generator 11 and the power supply end of the microprocessor 41. The power supply unit 8 supplies power to the square wave generator 11 and the microprocessor 41. The power supply unit 8 can adopt a switching power supply or a linear power supply or a combination of a switching power supply and a linear power supply.

[0045] Example 2:

[0046] Cooperate Figure 2 As shown, the difference between the second embodiment of the present invention and the first embodiment lies in the different connection structures of the first resistor 241 and the first capacitor 242 of the first detection branch 24 .

[0047] Specifically, in embodiment 2 of the present invention, the first end of the first capacitor 242 is connected to the first end of the first detection branch 24, the second end of the first capacitor 242 and the first end of the first resistor 241 are connected to the first output end of the detection unit 2, and the second end of the first resistor 241 is connected to the second end of the first detection branch 24.

[0048] In the second embodiment of the present invention, the calculation formula of the conductivity between the first detection electrode 2121 and the second detection electrode 2222 is:

[0049] G=(U1 / R1) / {(R2+R3)*U2 / R3-(R4+R5)*U3 / R5};

[0050] Among them, G is the conductivity between the first detection electrode 21 and the second detection electrode 22, U1 is the output voltage of the first output end of the detection unit 2, U2 is the output voltage of the second output end of the detection unit 2, U3 is the voltage of the third output end of the detection unit 2, R1 is the resistance value of the first resistor 241, R2 is the resistance value of the second resistor 251, R3 is the resistance value of the third resistor 252, R4 is the resistance value of the fourth resistor 261, and R5 is the resistance value of the fifth resistor 262.

[0051] It should be noted that the present invention is not limited to the detection of the salt concentration of the salt solution A, but can also be applied to the detection of the conductivity of other solutions.

[0052] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A solution detection circuit structure, characterized in that: It includes an excitation unit, a detection unit, a signal processing unit and a control unit; The excitation unit includes a square wave generator for generating a square wave signal, the square wave signal switches between a high level and a zero level, and the output end of the square wave generator is connected to the excitation end of the detection unit; The detection unit includes a first detection electrode, a second detection electrode, a power resistor, a first detection branch, a second detection branch and a third detection branch; the first detection branch includes a first resistor and a first capacitor connected in series, the first end of the first detection branch is connected to the first detection electrode, the second end of the second detection branch is grounded, and the common node of the first resistor and the first capacitor is connected to the first output end of the detection unit; the second detection branch includes a second resistor and a third resistor connected in series, the first end of the second detection branch is connected to the first end of the power resistor and the second detection electrode, the second end of the second detection branch is grounded, and the common node of the second resistor and the third resistor is connected to the second output end of the detection unit; the third detection branch includes a fourth resistor and a fifth resistor connected in series, the first end of the third detection branch is connected to the first detection electrode, the second end of the third detection branch is grounded, and the common node of the fourth resistor and the fifth resistor is connected to the third output end of the detection unit; the second end of the power resistor is connected to the excitation end of the detection unit; The signal processing unit includes a first signal processing circuit, a second signal processing circuit and a third signal processing circuit, the input end of the first signal processing circuit is connected to the first output end of the detection unit, the input end of the second signal processing circuit is connected to the second output end of the detection unit, and the input end of the third signal processing circuit is connected to the third output end of the detection unit; The control unit includes a microprocessor, and the microprocessor is connected to the output end of the first signal processing circuit, the output end of the second signal processing circuit, and the output end of the third signal processing circuit respectively.

2. A solution detection circuit structure according to claim 1, characterized in that: The first signal processing circuit, the second signal processing circuit and the third signal processing circuit of the signal processing unit adopt signal filtering and amplifying circuits.

3. A solution detection circuit structure according to claim 1, characterized in that: The device also includes a temperature probe, which is connected to the microprocessor.

4. A solution detection circuit structure according to claim 1, characterized in that: The first detection electrode and the second detection electrode are made of one of titanium, copper, titanium alloy or stainless steel.

5. A solution detection circuit structure according to claim 1, characterized in that: During one cycle of the square wave signal generated by the square wave generator, the high level duration of the square wave signal is 0.01ms to 500ms, and the high level duration of the square wave signal is less than or equal to the low level duration.

6. A solution detection circuit structure according to claim 1, characterized in that: The high-level voltage of the square wave signal generated by the square wave generator is 3V~48V.

7. A solution detection circuit structure according to claim 1, characterized in that: Also included is a wireless communication unit and / or a display unit connected to the microprocessor.

8. A solution detection circuit structure according to claim 1, characterized in that: The utility model also comprises a power supply unit, which is respectively connected to the power supply end of the square wave generator and the power supply end of the microprocessor.

9. A solution detection circuit structure according to claim 1, characterized in that: The first end of the first resistor is connected to the first end of the first detection branch, the second end of the first resistor and the first end of the first capacitor are connected to the first output end of the detection unit, and the second end of the first capacitor is connected to the second end of the first detection branch.

10. A solution detection circuit structure according to claim 1, characterized in that: The first end of the first capacitor is connected to the first end of the first detection branch, the second end of the first capacitor and the first end of the first resistor are connected to the first output end of the detection unit, and the second end of the first resistor is connected to the second end of the first detection branch.

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