Solution detection circuit
By designing a solution detection circuit including a square wave generator and a signal processing circuit, the problem of low salt concentration detection accuracy of existing sodium hypochlorite generators is solved, and high-precision salt concentration detection and wireless communication functions are realized.
Patent Information
- Application Number
- CN202421365159.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-14
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-06-14
AI Technical Summary
The salt concentration detection circuit of the existing sodium hypochlorite generator has low conductivity detection accuracy for the salt solution, resulting in low salt concentration detection accuracy and deviation.
A solution detection circuit is adopted, including an excitation module, a detection module, a signal processing module and a control module, and the square wave signal generated by the square wave generator is used for detection, the conductivity is calculated through the first and second detection electrodes and the salt concentration is converted, and the precise calculation is carried out in combination with the signal filtering and a microprocessor, and a temperature probe and a wireless communication circuit are equipped to improve detection accuracy.
It effectively avoids polarization of the detection electrode and scale accumulation, ensures the accuracy of conductivity and salt concentration detection, and provides intuitive detection results and wireless communication functions.
Smart Images
Figure CN223139463U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of sodium hypochlorite generators, in particular to a solution detection circuit. Background Art
[0002] A sodium hypochlorite generator electrolyzes salt (sodium chloride) in a salt solution to form sodium hypochlorite, which has a disinfection effect. The electrolysis efficiency of the existing sodium hypochlorite generators is greatly affected by the salt concentration of the salt solution. Therefore, many existing sodium hypochlorite generators are equipped with a salt concentration detection circuit. The salt concentration detection circuit can detect the conductivity of the salt solution and convert the conductivity into the salt concentration accordingly. The sodium hypochlorite generator then adjusts the electrolysis current according to the current salt concentration. However, the existing salt concentration detection circuit has low detection accuracy for the conductivity of the salt solution, resulting in low detection accuracy and large detection deviation of the salt concentration.
[0003] In view of the existence of the above problems, it is necessary to study a solution detection circuit with the advantage of high detection accuracy. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a solution detection circuit with the advantage of high detection accuracy.
[0005] To achieve the above purpose, the solution of the utility model is as follows:
[0006] A solution detection circuit includes an excitation module, a detection module, a signal processing module and a control module; the excitation module 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 module; the detection module includes a first detection electrode, a second detection electrode, a detection capacitor, a first detection resistor, a second detection resistor, a third detection resistor and a fourth detection resistor; the first end of the detection capacitor and the first end of the fourth detection resistor are connected to the excitation end of the detection module, the second end of the detection capacitor and the first end of the second resistor are connected to the second detection electrode, the second end of the second detection resistor and the first end of the third detection resistor are connected to the first output end of the detection module, the first end of the first detection resistor is connected to the first detection electrode, and the second end of the first detection resistor, the second end of the third detection resistor and the first end of the fourth detection resistor are grounded; the signal processing module includes a first signal processing circuit and a second signal processing circuit, the input end of the first signal processing circuit is connected to the first output end of the detection module, and the input end of the second signal processing circuit is connected to the second output end of the detection module; the control module includes a microprocessor, and the microprocessor is respectively connected to the output ends of the first signal processing circuit and the second signal processing circuit.
[0007] The control module further includes a wireless communication circuit connected to the microprocessor.
[0008] The control module further includes a display circuit connected to the microprocessor.
[0009] The first signal processing circuit and the second signal processing circuit of the signal processing module employ a signal filtering and amplifying circuit.
[0010] The described solution detection circuit further includes a temperature probe, and the temperature probe is connected to the microprocessor.
[0011] The materials of the first detection electrode and the second detection electrode are one of titanium, copper, titanium alloy or stainless steel.
[0012] Within one cycle time of the square wave signal generated by the square wave generator, the high-level duration of the square wave signal is 0.01 ms to 500 ms, and the high-level duration of the square wave signal is less than or equal to the low-level duration.
[0013] The voltage of the high level of the square wave signal generated by the square wave generator is 3V to 48V.
[0014] The described solution detection circuit further includes a power supply module, and the power supply module is respectively connected to the power supply terminal of the square wave generator and the power supply terminal of the microprocessor.
[0015] After adopting the above solution, when the utility model 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 module generates a square wave signal and outputs it to the detection module, causing a voltage difference to be generated between the first detection electrode and the second detection electrode. The microprocessor obtains the output voltages of the first output terminal and the second output terminal of the detection module through the first signal processing circuit and the second signal processing circuit of the signal processing module. Then, the microprocessor calculates the conductivity between the first detection electrode and the second detection electrode in combination with the resistance values of the first detection resistor, the second detection resistor and the third detection resistor. Then, the microprocessor converts this conductivity into the corresponding salt concentration, thereby realizing the detection of the salt concentration of the salt solution.
[0016] The square-wave signal generated by the square-wave generator of the present utility model switches back and forth between a high level and a zero level. Thus, when the square-wave signal is at a high level, the first detection electrode is at a high level and the second detection electrode is at a low level; when the square-wave signal is at a low level, the detection capacitor discharges, causing the first detection electrode to be at a low level and the second detection electrode to be at a high level. This prevents polarization from occurring on the first and second detection electrodes, avoiding changes in the surface electrochemical characteristics of the first and second detection electrodes due to polarization. At the same time, it also reduces the accumulation of scale on the first and second detection electrodes, which could otherwise change the electrode constant. This effectively ensures the detection accuracy of conductivity, and thereby the detection accuracy of salt concentration.
[0017] Within one cycle of the square-wave signal generated by the square-wave generator of the present utility model, the duration of the high level of the square-wave signal is 0.01 ms to 500 ms, and the duration of the high level of the square-wave signal is less than or equal to the duration of the low level. With such a short high-level duration, the detection capacitor can effectively discharge, ensuring that polarization does not occur on the first and second detection electrodes. In addition, the voltage of the high level of the square-wave signal generated by the square-wave generator is 3 V to 48 V. This results in a small and short-duration current passing between the first and second detection electrodes, such that the first and second detection electrodes hardly electrolyze sodium chloride, further ensuring that polarization does not occur on the first and second detection electrodes. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 is the schematic diagram of the present utility model.
[0019] LABEL DESCRIPTION:
[0020] Excitation module 1, square-wave generator 11,
[0021] Detection module 2, first detection electrode 21, second detection electrode 22, detection capacitor 23, first detection resistor 24, second detection resistor 25, third detection resistor 26, fourth detection resistor 27,
[0022] Signal processing module 3, first signal processing circuit 31, second signal processing circuit 32,
[0023] Control module 4, microprocessor 41, wireless communication circuit 42, display circuit 43,
[0024] Temperature probe 5,
[0025] Power supply module 6,
[0026] Salt solution A. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0027] To further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.
[0028] As Figure 1 shown, the present invention discloses a solution detection circuit, which includes an excitation module 1, a detection module 2, a signal processing module 3 and a control module 4; wherein, the excitation module 1 includes a square wave generator 11 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 11 is connected to the excitation end of the detection module 2; the detection module 2 includes a first detection electrode 21, a second detection electrode 22, a detection capacitor 23, a first detection resistor 24, a second detection resistor 25, a third detection resistor 26 and a fourth detection resistor 27; the first end of the detection capacitor 23 and the first end of the fourth detection resistor 27 are connected to the excitation end of the detection module 2, the second end of the detection capacitor 23 and the first end of the second resistor are connected to the second detection electrode 22, the second end of the second detection resistor 25 and the first end of the third detection resistor 26 are connected to the first output end of the detection module 2, the first end of the first detection resistor 24 is connected to the first detection electrode 21, and the second end of the first detection resistor 24, the second end of the third detection resistor 26 and the first end of the fourth detection resistor 27 are grounded; the signal processing module 3 includes a first signal processing circuit 31 and a second signal processing circuit 32, the input end of the first signal processing circuit 31 is connected to the first output end of the detection module 2, and the input end of the second signal processing circuit 32 is connected to the second output end of the detection module 2; the control module 4 includes a microprocessor 41, and the microprocessor 41 is respectively connected to the output ends of the first signal processing circuit 31 and the second signal processing circuit 32.
[0029] The working principle of the present invention is as follows: when the present invention is used to detect the salt concentration of the salt solution A, the first detection electrode 21 and the second detection electrode 22 are both placed in the salt solution A to be detected, and the square wave generator 11 of the excitation module 1 generates a square wave signal and outputs it to the detection module 2, so that a voltage difference is generated between the first detection electrode 21 and the second detection electrode 22. The microprocessor 41 obtains the output voltages of the first output end and the second output end of the detection module 2 through the first signal processing circuit 31 and the second signal processing circuit 32 of the signal processing module 3. Then, the microprocessor 41 combines the resistance values of the first detection resistor 24, the second detection resistor 25 and the third detection resistor 26 to calculate the conductivity between the first detection electrode 21 and the second detection electrode 22. Then, the microprocessor 41 converts the conductivity into the corresponding salt concentration, so as to realize the detection of the salt concentration of the salt solution A. Among them, the conversion of conductivity into the corresponding salt concentration is a conventional design in the art and will not be elaborated here.
[0030] The calculation formula for the conductivity between the first detection electrode 21 and the second detection electrode 22 in this utility model is: G = (U1 / R1) / {(R2 + R3)U2 / R3} = (U1 * R3) / {U2 * R1 * (R2 + R3)}, where 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 terminal of the detection module 2, U2 is the output voltage of the second output terminal of the detection module 2, R1 is the resistance value of the first detection resistor 24, R2 is the resistance value of the second detection resistor 25, and R3 is the resistance value of the third detection resistor 26.
[0031] In the embodiment of this utility model, the square wave signal generated by the square wave generator 11 switches back and forth between the high level and the zero level. In this way, when the square wave signal is at the high level, the first detection electrode 21 is at the high level and the second detection electrode 22 is at the low level; when the square wave signal is at the low level, the detection capacitor 23 discharges, making the first detection electrode 21 at the low level and the second detection electrode 22 at the high level. This prevents the first detection electrode 21 and the second detection electrode 22 from polarizing, avoiding changes in the surface electrochemical characteristics of the first detection electrode 21 and the second detection electrode 22 due to polarization. At the same time, it can also reduce the accumulation of scale on the first detection electrode 21 and the second detection electrode 22, thus changing the electrode constant. In this way, the detection accuracy of the conductivity can be effectively guaranteed, and further the detection accuracy of the salt concentration can be guaranteed. Among them, this utility model measures the conductivity between the first detection electrode 21 and the second detection electrode 22 when the square wave signal is at the high level, which can ensure the voltage stability of the first detection electrode 21 and the second detection electrode 22 and thus guarantee the detection accuracy.
[0032] In the embodiment of this utility model, within one cycle time of the square wave signal generated by the square wave generator 11, the high level duration of the square wave signal is 0.01 ms to 500 ms, and the high level duration of the square wave signal is less than or equal to the low level duration. In this way, the high level duration is short and the detection capacitor 23 can effectively discharge, ensuring that the first detection electrode 21 and the second detection electrode 22 do not polarize. In addition, the voltage of the high level of the square wave signal generated by the square wave generator 11 is 3 V to 48 V. In this way, the conduction current between the first detection electrode 21 and the second detection electrode 22 is small and the conduction time is short, making it basically impossible for the first detection electrode 21 and the second detection electrode 22 to electrolyze sodium chloride, further ensuring that the first detection electrode 21 and the second detection electrode 22 do not polarize.
[0033] In an embodiment of the present utility model, the control module 4 further includes a wireless communication circuit 42 and a display circuit 43 connected to the microprocessor 41. Among them, the wireless communication circuit 42 can adopt a Bluetooth communication circuit or a WiFi communication circuit. The wireless communication circuit 42 enables the microprocessor 41 to perform wireless communication with external intelligent terminals (such as smart phones and tablet computers), facilitating users to obtain the detection results of the entire solution detection circuit through the intelligent terminals; while the display circuit 43 can adopt an LCD display circuit or a digital tube display circuit, and the microprocessor 41 can implement the detection results through the display circuit 43, facilitating users to intuitively understand the detection results.
[0034] In an embodiment of the present utility model, the first signal processing circuit 31 and the second signal processing circuit 32 of the signal processing module 3 adopt signal filtering and amplification circuits. The signal filtering and amplification circuits can filter and amplify the signals, ensuring that the microprocessor 41 can accurately obtain the output voltages of the first output terminal and the second output terminal of the detection module; the signal filtering and amplification circuit is a common circuit and will not be elaborated here.
[0035] In an embodiment of the present utility model, the materials of the first detection electrode 21 and the second detection electrode 22 are one of titanium, copper, titanium alloy or stainless steel. In this way, 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.
[0036] In an embodiment of the present utility model, the present utility model further includes a temperature probe 5. The temperature probe 5 is connected to the microprocessor 41. The microprocessor 41 detects the temperature of the salt solution A through the temperature probe 5, and the microprocessor 41 combines the temperature of the salt solution A to convert the conductivity between the first detection electrode 21 and the second detection electrode 22 into the corresponding salt concentration. In this way, the conversion result is more accurate, effectively improving the detection accuracy of the salt concentration.
[0037] In an embodiment of the present utility model, the present utility model further includes a power supply module 6. The power supply module 6 is respectively connected to the power supply terminal of the square wave generator 11 and the power supply terminal of the microprocessor 41. The power supply module 6 supplies power to the square wave generator 11 and the microprocessor 41. The power supply module 6 can adopt a switching power supply or a linear power supply or a combination of a switching power supply and a linear power supply.
[0038] It should be noted that the present utility model is not limited to the detection of the salt concentration of salt solutions, and the present utility model can also be applied to the detection of the conductivity of other solutions.
[0039] The above embodiments and diagrams do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by those of ordinary skill in the relevant technical field shall be regarded as not departing from the patent scope of the present utility model.
Claims
1. A solution detection circuit, characterized in that: It includes an excitation module, a detection module, a signal processing module, and a control module; The excitation module 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 module; The detection module includes a first detection electrode, a second detection electrode, a detection capacitor, a first detection resistor, a second detection resistor, a third detection resistor, and a fourth detection resistor; the first end of the detection capacitor and the first end of the fourth detection resistor are connected to the excitation end of the detection module, the second end of the detection capacitor and the first end of the second resistor are connected to the second detection electrode, the second end of the second detection resistor and the first end of the third detection resistor are connected to the first output end of the detection module, the first end of the first detection resistor is connected to the first detection electrode, and the second end of the first detection resistor, the second end of the third detection resistor, and the first end of the fourth detection resistor are grounded; The signal processing module includes a first signal processing circuit and a second signal processing circuit, the input end of the first signal processing circuit is connected to the first output end of the detection module, and the input end of the second signal processing circuit is connected to the second output end of the detection module; The control module includes a microprocessor, and the microprocessor is respectively connected to the output ends of the first signal processing circuit and the second signal processing circuit.
2. The solution detection circuit according to claim 1, characterized in that: The control module further includes a wireless communication circuit connected to the microprocessor.
3. The solution detection circuit according to claim 1, characterized in that: The control module further includes a display circuit connected to the microprocessor.
4. The solution detection circuit according to claim 1, wherein: The first signal processing circuit and the second signal processing circuit of the signal processing module adopt signal filtering and amplification circuits.
5. The solution detection circuit according to claim 1, wherein: It further includes a temperature probe, and the temperature probe is connected to the microprocessor.
6. The solution detection circuit according to claim 1, wherein: The materials of the first detection electrode and the second detection electrode are one of titanium, copper, titanium alloy, or stainless steel.
7. The solution detection circuit according to claim 1, wherein: Within one cycle time of the square wave signal generated by the square wave generator, the high level duration of the square wave signal is 0.01 ms to 500 ms, and the high level duration of the square wave signal is less than or equal to the low level duration.
8. The solution detection circuit according to claim 1 or 7, characterized in that: The voltage of the high level of the square wave signal generated by the square wave generator is 3V to 48V.
9. The solution detection circuit according to claim 1, wherein: It further includes a power supply module, and the power supply module is respectively connected to the power supply end of the square wave generator and the power supply end of the microprocessor.