A probe-type liquid level sensor control system

Abstract

The utility model discloses a kind of probe type liquid level sensor control systems, by setting main control module, power module, drive module, probe sensor connection port and rectifier filter module, drive module receives the input voltage of power module, main control module controls drive module and converts input voltage into alternating voltage, rectifier filter module processes the output signal of multiple probe detection liquid level as direct current voltage and is fed back to main control module, probe is supplied using alternating current, can effectively avoid the electrochemical reaction caused by direct current voltage, improve the service life of probe, so that the detection signal of probe type liquid level sensor control system is more stable and accurate, help to maintain the stable operation of entire liquid level sensor control system, improve the reliability and stability of system, reduce maintenance cost.

Description

Technical Field

[0001] This utility model belongs to the field of liquid level sensor technology, and in particular relates to a probe-type liquid level sensor control system. Background Technology

[0002] Accurate liquid level detection is crucial in industrial production, daily life, and various scientific research scenarios. Traditional probe-type liquid level sensor control systems generally use direct current (DC) to power the probe. However, in practical applications, the probe is immersed in liquid for extended periods, and the DC current triggers an electrochemical reaction, causing the probe to gradually corrode. Once corroded, the physical and chemical properties of the probe surface change, significantly shortening its lifespan and causing deviations in the detection signal. This greatly affects the accuracy of liquid level detection, thereby interfering with the normal operation of the entire liquid level detection system and making it difficult to meet the requirements for accurate liquid level monitoring. Utility Model Content

[0003] To address the aforementioned problems, this invention provides a probe-type liquid level sensor control system that uses AC power to supply the probe, effectively avoiding electrochemical reactions caused by DC power, reducing the cost and time consumption caused by frequent probe replacements, and improving the accuracy of the entire liquid level sensor control system in detecting the liquid level, thereby solving the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a probe-type liquid level sensor control system, including a main control module, a power supply module, a drive module, a probe sensor connection port, and a rectification and filtering module. The power supply module, the drive module, and the rectification and filtering module are all connected to the main control module. The power supply module is connected to the drive module. The drive module and the rectification and filtering module are both connected to the probe sensor connection port. The probe sensor connection port is used to connect multiple probes for detecting liquid level. The drive module receives the input voltage from the power supply module, the main control module controls the drive module to convert the input voltage into an AC voltage, and the rectifier and filter module processes the output signal of the multiple probes detecting the liquid level into a DC voltage and feeds it back to the main control module.

[0005] As a preferred embodiment of the above technical solution, the probe sensor connection port is used to connect a first probe, a second probe, and a third probe. The first probe is connected to the driving module. The rectification and filtering module includes a first rectification and filtering circuit and a second rectification and filtering circuit. The second probe is connected to the first rectification and filtering circuit, and the third probe is connected to the second rectification and filtering circuit.

[0006] As a preferred embodiment of the above technical solution, the driving module includes a voltage conversion chip and a current limiting unit connected to the power supply module. One end of the current limiting unit is connected to the voltage conversion chip, and the other end of the current limiting unit is connected to the probe sensor connection port.

[0007] As a preferred embodiment of the above technical solution, the first rectifier filter circuit and the second rectifier filter circuit include multiple diodes, resistors and capacitors.

[0008] As a preferred embodiment of the above technical solution, the voltage conversion chip includes chip U3 with model number LN851USR-G.

[0009] As a preferred embodiment of the above technical solution, the power module includes a power input interface connected to the chip U3 and a voltage regulator chip, wherein the power input interface is connected to the voltage regulator chip.

[0010] As a preferred embodiment of the above technical solution, the voltage regulator chip includes chip U2 with model number ASM1117.

[0011] As a preferred embodiment of the above technical solution, the main control module includes a chip U1 with the model number PIC12(L)F1572.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: By configuring a main control module, a power supply module, a drive module, a probe sensor connection port, and a rectification and filtering module, the drive module receives the input voltage from the power supply module. The main control module controls the drive module to convert the input voltage into AC voltage. The rectification and filtering module processes the output signals of multiple probes detecting liquid levels into DC voltage and feeds them back to the main control module. Using AC power to supply the probes effectively avoids electrochemical reactions caused by DC voltage, improves the probe's lifespan, and makes the detection signal of the probe-type liquid level sensor control system more stable and accurate. This helps maintain the stable operation of the entire liquid level sensor control system, improves the system's reliability and stability, and reduces maintenance costs. Attached Figure Description

[0013] Figure 1 This is a structural block diagram of the probe-type liquid level sensor control system proposed in this utility model; Figure 2 The circuit diagram is shown for the power supply module proposed in this utility model. Figure 3 This is a circuit diagram of the main control module proposed in this utility model; Figure 4 This is a circuit diagram of the driving module proposed in this utility model; Figure 5 This is a schematic diagram illustrating the working principle of the probe-type liquid level sensor control system proposed in this utility model.

[0014] The symbols for the main components are explained below: 10-Main control module; 20-Power supply module; 30-Driver module; 31-Voltage conversion chip; 32-Current limiting unit; 40-Probe sensor connection port; 41-First probe; 42-Second probe; 43-Third probe; 50-Rectifier and filter module; 51-First rectifier and filter circuit; 52-Second rectifier and filter circuit. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0017] The core objective of this invention is to provide an innovative probe-type liquid level sensor control system, which aims to fundamentally solve the corrosion problem caused by the probe being in contact with liquid for a long time and being affected by direct current in the prior art, thereby significantly improving the accuracy of liquid level detection and the stability of system operation.

[0018] See Figure 1 This utility model provides a probe-type liquid level sensor control system, including a main control module 10, a power supply module 20, a drive module 30, a probe sensor connection port 40, and a rectification and filtering module 50. The power supply module 20, the drive module 30, and the rectification and filtering module 50 are all connected to the main control module 10. The power supply module 20 is connected to the drive module 30. The drive module 30 and the rectification and filtering module 50 are all connected to the probe sensor connection port 40. The probe sensor connection port 40 is used to connect multiple probes for detecting liquid level. The drive module 30 receives the input voltage from the power module 20, the main control module 10 controls the drive module 30 to convert the input voltage into an AC voltage, and the rectifier and filter module 50 processes the output signals of the multiple probes detecting the liquid level into a DC voltage and feeds them back to the main control module 10.

[0019] In this embodiment, as Figure 4 As shown, the probe sensor connection port 40 is used to connect a first probe 41, a second probe 42, and a third probe 43. The first probe 41 is connected to the driving module 30. The rectifier and filter module 50 includes a first rectifier and filter circuit 51 and a second rectifier and filter circuit 52. The second probe 42 is connected to the first rectifier and filter circuit 51, and the third probe 43 is connected to the second rectifier and filter circuit 52. The driving module 30 includes a voltage conversion chip 31 and a current limiting unit 32 connected to the power module 20. One end of the current limiting unit 32 is connected to the voltage conversion chip 31, and the other end of the current limiting unit 32 is connected to the probe sensor connection port 40. The first rectifier and filter circuit 51 and the second rectifier and filter circuit 52 include multiple diodes, resistors, and capacitors. The voltage conversion chip 31 includes a chip U3 of model LN851USR-G. The power module 20 includes a power input interface connected to the chip U3 and a voltage regulator chip. The power input interface is connected to the voltage regulator chip. The voltage regulator chip includes chip U2 with model number ASM1117, and the main control module 10 includes chip U1 with model number PIC12(L)F1572.

[0020] This invention comprises a main control module 10, a power supply module 20, a drive module 30, a probe sensor connection port 40, and a rectification and filtering module 50. The drive module 30 receives the input voltage from the power supply module 20, and the main control module 10 controls the drive module 30 to convert the input voltage into AC voltage. The rectification and filtering module 50 processes the output signals of multiple probes detecting liquid levels into DC voltage and feeds them back to the main control module 10. By using AC power to supply the probes, electrochemical reactions caused by DC voltage can be effectively avoided, thus improving the service life of the probes. This makes the detection signal of the probe-type liquid level sensor control system more stable and accurate, helps maintain the stable operation of the entire liquid level sensor control system, improves the reliability and stability of the system, and reduces maintenance costs.

[0021] It should be noted that, as Figure 3 As shown, the main control module 10 includes a chip U1, a resistor R1, a capacitor C1, and a capacitor C2. One end of the resistor R1 is connected to pin 4 of the chip U1, and the other end of the resistor R1 is connected to pin 1 of the chip U1, capacitor C1, and capacitor C2. Capacitors C1 and C2 are connected to pin 8 of the chip U1. Figure 2As shown, the power input interface includes terminals J1 and J2. One end of terminal J1 is used to input a DC voltage of +12V, and one end of terminal J2 is used to connect to 0V. The other end of terminal J1 is connected to fuse FA, which has a current threshold of 0.5A. The other end of terminal J2 is connected to the cathode of diode D1. The anode of diode D1 and fuse FA are respectively connected to the two ends of capacitor C3. The input terminal of chip U2 is connected to one end of resistor R2 and capacitor C4. The other end of resistor R2 is connected to fuse FA and capacitor C3. The output terminal of chip U2 is connected to capacitors C5 and C6. Capacitor C4 is connected to capacitors C5 and C6 and grounded.

[0022] Specifically, pin 1 of chip U3 is connected to one end of resistor R3, pin 2 of chip U3 is connected to one end of resistor R4, the other ends of resistor R3 and resistor R4 are connected to pins 2 (SWCHL) and 3 (SWCHH) of chip U1 respectively, pin 4 of chip U3 is connected to one end of capacitor C7, pins 5 and 6 of chip U3 are connected to one end of capacitor C8, the other ends of capacitor C7 and capacitor C8 are connected to pin 3 of chip U3 and grounded, pins 7 and 8 of chip U3 are connected to one end of resistor R5, the other end of resistor R5 is connected to one end of capacitor C11, the other end of capacitor C11 is connected to the first probe on probe sensor connection port 40, the first probe 41 (denoted as probe 1) can be regarded as input signal, the first probe 41, the second probe 42 (denoted as probe 2), and the third probe 43 (denoted as probe 3) on probe sensor connection port 40 are all placed in the liquid to be tested, the second probe 42 is connected to capacitor C12, and the third probe 43 is connected to capacitor C13. Each probe is electrically connected via a liquid, meaning that the liquid's conductivity provides electrical charge to the outputs of probes 2 and 3, while probe 1 operates under the stable effect of a small current alternating current.

[0023] The first rectifier filter circuit 51 and the second rectifier filter circuit 52 have the same circuit structure. The input terminal of the first rectifier filter circuit 51 is connected to capacitor C12, and the input terminal of the second rectifier filter circuit 52 is connected to capacitor C13. That is, the first rectifier filter circuit 51 and the second rectifier filter circuit 52 are connected to the second probe 42 and the third probe 43, respectively. The first rectifier filter circuit 51 includes diode D2, diode D3, capacitor C9, resistor R6 and resistor R7. The anode of diode D2 is connected to the cathode of diode D3 and capacitor C12. The cathode of diode D2 is connected to capacitor C9 and one end of resistor R7. The anode of diode D3 is connected to resistor R6, and the other end of resistor R7 is connected to capacitor C9 and resistor R6. The second rectifier and filter circuit 52 includes diodes D4 and D5, resistors R8 and R9, and capacitor C10. The cathode of diode D5 is connected to capacitor C13, and the anode of diode D5 is connected to one end of resistor R8. The other end of resistor R8 is connected to one end of capacitor C10 and resistor R9. The other end of resistor R9 is connected to the cathode of diode D4 and capacitor C10. The anode of diode D4 is left floating. The output terminals of resistors R7 and R9 are connected to chip U1.

[0024] See Figure 5 First probe 41 (probe 1, Figure 5 1) is located between the low and medium liquid levels of the liquid being tested, and the second probe (probe 2) is located between the low and medium liquid levels of the liquid being tested. Figure 5 2) Located below the low liquid level of the liquid to be tested, the third probe (probe 3, Figure 5 3) Located between the middle and high levels of the liquid to be measured. With probe 1 as the input signal, if both probe 2 and probe 3 are high, the liquid level to be measured is high; if probe 2 is high and probe 3 is low, the liquid level to be measured is middle; if probe 2 is low and probe 3 is low, the liquid level to be measured is low; if probe 2 is low and probe 3 is high, the liquid level to be measured is a detection error.

[0025] The working process and effects of the probe-type liquid level sensor control system provided by this utility model are as follows: 1. Power Input and Conversion: The power module provides a 12V DC voltage. Through the conversion of the MCU and the LN8515USR-G chip, the input DC 12V voltage is converted into AC voltage output. This conversion process is controllable and can continuously or intermittently output AC voltage. It is also a key part of the entire system and lays the foundation for subsequent AC power supply. 2. Current limiting and liquid connection: The converted AC current is limited by resistor R5 and then connected to the liquid to be tested (the liquid to be tested) through capacitor C11. The current limiting operation ensures that the current entering the liquid is within a safe and appropriate range, avoiding adverse effects on the system or liquid detection due to excessive current. 3. Probe Power Supply: In stark contrast to traditional technologies, this system supplies probe 1 with a small current of alternating current. During the liquid level detection process, the conductivity of the liquid itself provides power to the outputs of probes 2 and 3, while probe 1 operates under the stabilizing effect of the small current of alternating current. 4. When the liquid level is normal, the stable DC voltage output from probes 2 and 3 after rectification and filtering is input to the corresponding I / O port of the MCU to determine the corresponding liquid level.

[0026] It should be understood that using AC power to supply probe 1 effectively avoids electrochemical reactions caused by DC power, preventing corrosion of probe 1 during prolonged contact with liquid. This significantly extends the service life of probe 1, reducing the cost and time associated with frequent probe replacements. Because probe 1 maintains a consistently good working condition without performance changes due to corrosion, its detection signal is more stable and accurate. During liquid level detection, it provides reliable data support to the system, greatly improving the accuracy of the entire liquid level sensor control system and ensuring the smooth operation of related production, daily life, and scientific research activities. The stable working state of probe 1 helps maintain the stable operation of the entire liquid level sensor control system. It reduces detection anomalies and system failures caused by probe corrosion, improves system reliability and stability, and lowers maintenance costs.

[0027] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A probe-type liquid level sensor control system, characterized in that, It includes a main control module, a power supply module, a drive module, a probe sensor connection port, and a rectification and filtering module. The power supply module, the drive module, and the rectification and filtering module are all connected to the main control module. The power supply module is connected to the drive module. The drive module and the rectification and filtering module are all connected to the probe sensor connection port. The probe sensor connection port is used to connect multiple probes for detecting liquid level. The drive module receives the input voltage from the power supply module, the main control module controls the drive module to convert the input voltage into an AC voltage, and the rectifier and filter module processes the output signal of the multiple probes detecting the liquid level into a DC voltage and feeds it back to the main control module.

2. The probe-type liquid level sensor control system according to claim 1, characterized in that, The probe sensor connection port is used to connect a first probe, a second probe, and a third probe. The first probe is connected to the driving module. The rectification and filtering module includes a first rectification and filtering circuit and a second rectification and filtering circuit. The second probe is connected to the first rectification and filtering circuit, and the third probe is connected to the second rectification and filtering circuit.

3. The probe-type liquid level sensor control system according to claim 2, characterized in that, The driving module includes a voltage conversion chip and a current limiting unit connected to the power module. One end of the current limiting unit is connected to the voltage conversion chip, and the other end of the current limiting unit is connected to the probe sensor connection port.

4. The probe-type liquid level sensor control system according to claim 2, characterized in that, The first rectifier filter circuit and the second rectifier filter circuit include multiple diodes, resistors and capacitors.

5. The probe-type liquid level sensor control system according to claim 3, characterized in that, The voltage conversion chip includes chip U3 with model number LN851USR-G.

6. The probe-type liquid level sensor control system according to claim 5, characterized in that, The power module includes a power input interface connected to the chip U3 and a voltage regulator chip, and the power input interface is connected to the voltage regulator chip.

7. The probe-type liquid level sensor control system according to claim 6, characterized in that, The voltage regulator chip includes chip U2, model ASM1117.

8. The probe-type liquid level sensor control system according to claim 1, characterized in that, The main control module includes a chip U1 with the model number PIC12(L)F1572.

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