Sensitivity-adjustable liquid level detection circuit

By designing a sensitivity-adjustable liquid level detection circuit, the problem of detection failure of fully automated biochemical analyzers for polar reagents was solved, achieving adjustable sensitivity and reduced costs, and improving the reliability of detection.

CN223623672UActive Publication Date: 2025-12-02WUXI SHENRUI BIO PHARMA
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Patent Information

Application Number
CN202423145590.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-19
Publication Date
2025-12-02
Estimated Expiration
2034-12-19

AI Technical Summary

Technical Problem

The parameters of the liquid level detection circuit in existing fully automated biochemical analyzers are fixed, making it impossible to adjust the sensitivity of the liquid level sensing circuit board, which leads to the failure to detect reagents with very strong or very weak polarity.

Method used

An adjustable-sensitivity liquid level detection circuit was designed, including a signal processing circuit, a signal detection circuit, a liquid level detection sensitivity adjustment circuit, an anti-collision detection circuit, and an LED display circuit. The signal processing circuit adjusts the sensitivity of the liquid level detection, and the anti-collision detection circuit determines whether the sample dispensing needle is colliding with the liquid level. The LED display circuit is then controlled to emit light to indicate the liquid level.

Benefits of technology

It achieves adjustable sensitivity, adapts to reagent detection of different polarities, reduces costs, and improves detection reliability.

✦ Generated by Eureka AI based on patent content.

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    Figure CN223623672U_ABST
Patent Text Reader

Abstract

The utility model discloses a sensitivity-adjustable liquid level detection circuit, which relates to the field of medical precision analysis instruments, and comprises a signal processing circuit used for receiving square wave signals of a signal detection circuit to judge liquid level information; the signal receiving circuit receives a signal of the liquid level detection sensitivity circuit to change a threshold value of whether the liquid level is contacted or not; whether the sampling needle is collided or not is judged based on whether the anti-collision signal of the anti-collision detection circuit is received or not; the LED display circuit is controlled to emit light; the signal detection circuit is used for detecting liquid level information through a sampling needle and outputting a square wave signal to the signal processing circuit; compared with the prior art, the beneficial effects of the utility model are that the circuit is simple in structure, only has more than twenty common components, and is low in cost; the liquid level sensing sensitivity can be adjusted through the liquid level detection sensitivity adjusting circuit, so that the liquid level sensing device can adapt to sensing of reagents with different polarities.
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Description

Technical Field

[0001] This utility model relates to the field of medical precision analysis instruments, specifically a sensitive adjustable liquid level detection circuit. Background Technology

[0002] Fully automated biochemical analyzers are mainly used for the quantitative detection of biochemical components in clinical blood and body fluid samples. Currently, most fully automated biochemical analyzers on the market have fixed liquid level detection circuit parameters, making it impossible for users to adjust the liquid level sensing sensitivity of the circuit board. For common biochemical reagents, the liquid level sensing circuit can detect the liquid level well, but for some reagents with very strong or very weak polarity, such as ammonium persulfate, liquid level detection is prone to failure, requiring improvement. Utility Model Content

[0003] The purpose of this invention is to provide a liquid level detection circuit with adjustable sensitivity to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A sensitivity-adjustable liquid level detection circuit includes:

[0006] The signal processing circuit is used to receive the square wave signal from the signal detection circuit to determine the liquid level information; receive the signal from the liquid level detection sensitivity circuit to change the threshold for whether the liquid level is in contact; determine whether the sampling needle has collided based on whether the anti-collision signal from the anti-collision detection circuit is received; and control the light emission of the LED display circuit.

[0007] The signal detection circuit is used to detect liquid level information through the sampling needle and output a square wave signal to the signal processing circuit; after the sampling needle contacts the liquid, the period of the output square wave signal is changed.

[0008] The liquid level detection sensitivity adjustment circuit is used to adjust the sensitivity of the signal detection circuit to liquid level detection through the signal processing circuit;

[0009] The anti-collision detection circuit is used to determine whether the sample needle has collided with a hard object and sends a feedback signal to the signal processing circuit.

[0010] LED display circuit, used to emit light when liquid level and anti-collision signals are detected;

[0011] The signal processing circuit is connected to the signal detection circuit, the liquid level detection sensitivity adjustment circuit, the anti-collision detection circuit, and the LED display circuit.

[0012] As a further embodiment of this utility model: the signal processing circuit includes chip U2, capacitor C3, and capacitor C4. Pin 7 of chip U2 is connected to the signal detection circuit. The model of chip U2 is STC11F04E. Pins 10, 11, 12, 13, and 14 of chip U2 are connected to the liquid level detection sensitivity adjustment circuit. Pin 15 of chip U2 is connected to the anti-collision detection circuit. Pins 6 and 15 of chip U2 are connected to the LED display circuit. Pin 16 of chip U2 is connected to a 5V voltage, one end of capacitor C3, and one end of capacitor C4. The other end of capacitor C3 and the other end of capacitor C4 are grounded.

[0013] As a further embodiment of this utility model: the signal detection circuit includes a sampling needle socket J1 and an amplifier U1-A. The sampling needle socket J1 is externally connected to a sampling needle. The first end of the sampling needle socket J1 is grounded. The second end of the sampling needle socket J1 is connected to one end of capacitor C1 and one end of capacitor C2. The other end of capacitor C1 is grounded. The other end of capacitor C2 is connected to the inverting input of amplifier U1-A and one end of resistor R6. The other end of resistor R6 is connected to the output input of amplifier U1-A, one end of resistor R2, one end of resistor R3, and a signal processing circuit. The other end of resistor R2 is connected to a 5V voltage. The other end of resistor R3 is connected to one end of resistor R4, one end of resistor R5, and the non-inverting input of amplifier U1-A. The other end of resistor R4 is connected to a 5V voltage, and the other end of resistor R5 is grounded.

[0014] As a further embodiment of this utility model: the liquid level detection sensitivity adjustment circuit includes a wave switch J4, the wave switch J4 is model DSWB04LHGET, pins 2, 4, 6, 8 and 10 of the wave switch J4 are connected to ground, and pins 1, 3, 5, 7 and 9 of the wave switch J4 are connected to the signal processing circuit.

[0015] As a further embodiment of this utility model: the anti-collision detection circuit includes an anti-collision socket J2, the first end of the anti-collision socket J2 is grounded, the second end of the anti-collision socket J2 is connected to one end of a resistor R8 and a signal processing circuit, a micro switch DM1-180P-1 is externally connected to the anti-collision socket J2, and the other end of the resistor R8 is connected to a 5V voltage.

[0016] As a further embodiment of this utility model: the LED display circuit includes diodes LED1 and LED2. The positive terminal of diode LED1 is connected to a 5V voltage through resistor R1, and the negative terminal of diode LED1 is connected to a signal processing circuit. The positive terminal of diode LED2 is connected to a 5V voltage, and the negative terminal of diode LED2 is connected to a signal processing circuit through resistor R7.

[0017] Compared with the prior art, the advantages of this utility model are: the utility model has a simple structure, only about twenty common components, and low cost; the liquid level detection sensitivity can be adjusted by the liquid level detection sensitivity adjustment circuit, thus adapting to the sensing of reagents with different polarities. Attached Figure Description

[0018] Figure 1 This is a circuit diagram of a liquid level detection circuit with adjustable sensitivity. Detailed Implementation

[0019] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1 A sensitivity-adjustable liquid level detection circuit includes:

[0021] The signal processing circuit is used to receive the square wave signal from the signal detection circuit to determine the liquid level information; receive the signal from the liquid level detection sensitivity circuit to change the threshold for whether the liquid level is in contact; determine whether the sampling needle has collided based on whether the anti-collision signal from the anti-collision detection circuit is received; and control the light emission of the LED display circuit.

[0022] The signal detection circuit is used to detect liquid level information through the sampling needle and output a square wave signal to the signal processing circuit; after the sampling needle contacts the liquid, the period of the output square wave signal is changed.

[0023] The liquid level detection sensitivity adjustment circuit is used to adjust the sensitivity of the signal detection circuit to liquid level detection through the signal processing circuit;

[0024] The anti-collision detection circuit is used to determine whether the sample needle has collided with a hard object and sends a feedback signal to the signal processing circuit.

[0025] LED display circuit, used to emit light when liquid level and anti-collision signals are detected;

[0026] The signal processing circuit is connected to the signal detection circuit, the liquid level detection sensitivity adjustment circuit, the anti-collision detection circuit, and the LED display circuit.

[0027] In this embodiment: Please refer to Figure 1The signal processing circuit includes chip U2, capacitor C3, and capacitor C4. Pin 7 of chip U2 is connected to the signal detection circuit. The model of chip U2 is STC11F04E. Pins 10, 11, 12, 13, and 14 of chip U2 are connected to the liquid level detection sensitivity adjustment circuit. Pin 15 of chip U2 is connected to the anti-collision detection circuit. Pins 6 and 15 of chip U2 are connected to the LED display circuit. Pin 16 of chip U2 is connected to a 5V voltage, one end of capacitor C3, and one end of capacitor C4. The other end of capacitor C3 and the other end of capacitor C4 are grounded.

[0028] The signal processing circuit integrates and processes information from the circuit to control the operation of the circuit.

[0029] In this embodiment: Please refer to Figure 1 The signal detection circuit includes a sampling needle socket J1, an amplifier U1-A, a sampling needle connected to the sampling needle socket J1, a grounded first end of the sampling needle socket J1, a second end of the sampling needle socket J1 connected to one end of capacitor C1 and one end of capacitor C2, the other end of capacitor C1 grounded, the other end of capacitor C2 connected to the inverting input of amplifier U1-A, one end of resistor R6, the other end of resistor R6 connected to the output of amplifier U1-A, one end of resistor R2, one end of resistor R3, a signal processing circuit, a 5V voltage connected to the other end of resistor R2, a 5V voltage connected to the other end of resistor R3, a non-inverting input of amplifier U1-A, a 5V voltage connected to the other end of resistor R4, and a grounded resistor R5.

[0030] The signal detection circuit is essentially a square wave generator circuit. The period of the square wave changes with the capacitance of the sampling needle. When the sampling needle comes into contact with the liquid, its capacitance changes, which in turn causes the period of the output square wave of the liquid level detection circuit to change. The change in the period of the square wave can characterize the volume of the liquid. The voltage V0 at the non-inverting input of the amplifier U1-A is V0 = (V1*R4+5*R3)*R5 / (R3*R4+R3*R5+R4*R5), where V1 is the output voltage at the output terminal of the amplifier U1-A. Resistor R6, capacitors C1 and C2, and sample needle socket J1 constitute an RC feedback circuit. When the voltage at the inverting input of amplifier U1-A is less than the voltage at the non-inverting input, the output voltage of amplifier U1-A is V1 = 5V. The RC feedback circuit charges capacitors C1 and C2 and sample needle socket J1, increasing the voltage at the inverting input of amplifier U1-A. When the voltage at the inverting input of amplifier U1-A is greater than the voltage at the non-inverting input, the output voltage of amplifier U1 is V1 = 0V. The RC feedback circuit then discharges in reverse, decreasing the voltage at the inverting input of amplifier U1. This charging and discharging cycle continues, resulting in a stable square wave output from amplifier U1, which changes with the capacitance of the sample needle.

[0031] In this embodiment: Please refer to Figure 1 The liquid level detection sensitivity adjustment circuit includes a torsion switch J4, the model of which is DSWB04LHGET. Pins 2, 4, 6, 8, and 10 of the torsion switch J4 are connected to ground, and pins 1, 3, 5, 7, and 9 of the torsion switch J4 are connected to the signal processing circuit.

[0032] The toggle switch J4 is used to adjust the sensitivity of the liquid level detection. If the period of the square wave output by the signal detection circuit changes more than a fixed threshold, it means that the liquid level has been detected; otherwise, it means that the liquid level has not been detected. The larger the fixed threshold, the greater the sensitivity of the liquid level detection. Different settings of the toggle switch J4 represent different threshold values.

[0033] In this embodiment: Please refer to Figure 1 The anti-collision detection circuit includes an anti-collision socket J2, the first end of which is grounded, the second end of which is connected to one end of a resistor R8, a signal processing circuit, and a micro switch DM1-180P-1 externally connected to the anti-collision socket J2. The other end of the resistor R8 is connected to a 5V voltage.

[0034] The anti-collision detection circuit senses the anti-collision signal through the micro switch DM1-180P-1 to determine whether the sampling needle has collided with a hard object, and stops the movement of the sampling needle when an anti-collision signal is generated. When an anti-collision signal is generated, the anti-collision socket J2 is at a high level; when no anti-collision signal is generated, the anti-collision socket J2 is at a low level.

[0035] In this embodiment: Please refer to Figure 1 The LED display circuit includes diodes LED1 and LED2. The positive terminal of diode LED1 is connected to a 5V voltage through resistor R1, and the negative terminal of diode LED1 is connected to the signal processing circuit. The positive terminal of diode LED2 is connected to a 5V voltage, and the negative terminal of diode LED2 is connected to the signal processing circuit through resistor R7.

[0036] Resistor R1 and diode LED1 are used to display the liquid level detection signal, and resistor R7 and diode LED2 are used to display the anti-collision signal.

[0037] The working principle of this invention is as follows: the signal processing circuit receives the square wave signal from the signal detection circuit to determine the liquid level information; it receives the signal from the liquid level detection sensitivity circuit to change the threshold for whether the liquid level is touched; it determines whether the sampling needle has collided based on whether the anti-collision signal from the anti-collision detection circuit is received; it controls the LED display circuit to emit light; the signal detection circuit detects the liquid level information through the sampling needle and outputs a square wave signal to the signal processing circuit; after the sampling needle contacts the liquid, it changes the period of the output square wave signal; the liquid level detection sensitivity adjustment circuit adjusts the sensitivity of the signal detection circuit to liquid level detection through the signal processing circuit; the anti-collision detection circuit determines whether the sampling needle has collided with a hard object and feeds back a signal to the signal processing circuit; the LED display circuit emits light to display when the liquid level and anti-collision signal are detected.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sensitivity-adjustable liquid level detection circuit, characterized in that, The adjustable-sensitivity liquid level detection circuit includes: The signal processing circuit is used to receive the square wave signal from the signal detection circuit to determine the liquid level information; receive the signal from the liquid level detection sensitivity circuit to change the threshold for whether the liquid level is in contact; determine whether the sampling needle has collided based on whether the anti-collision signal from the anti-collision detection circuit is received; and control the light emission of the LED display circuit. The signal detection circuit is used to detect liquid level information through the sampling needle and output a square wave signal to the signal processing circuit; after the sampling needle contacts the liquid, the period of the output square wave signal is changed. The liquid level detection sensitivity adjustment circuit is used to adjust the sensitivity of the signal detection circuit to liquid level detection through the signal processing circuit; The anti-collision detection circuit is used to determine whether the sample needle has collided with a hard object and sends a feedback signal to the signal processing circuit. LED display circuit, used to emit light when liquid level and anti-collision signals are detected; The signal processing circuit is connected to the signal detection circuit, the liquid level detection sensitivity adjustment circuit, the anti-collision detection circuit, and the LED display circuit.

2. The adjustable-sensitivity liquid level detection circuit according to claim 1, characterized in that, The signal processing circuit includes chip U2, capacitor C3, and capacitor C4. Chip U2 is model STC11F04E. Pin 7 of chip U2 is connected to the signal detection circuit. Pins 10, 11, 12, 13, and 14 of chip U2 are connected to the liquid level detection sensitivity adjustment circuit. Pin 15 of chip U2 is connected to the anti-collision detection circuit. Pins 6 and 15 of chip U2 are connected to the LED display circuit. Pin 16 of chip U2 is connected to a 5V voltage, one end of capacitor C3, and one end of capacitor C4. The other end of capacitor C3 and the other end of capacitor C4 are grounded.

3. The sensitivity-adjustable liquid level detection circuit according to claim 1 or 2, characterized in that, The signal detection circuit includes a sampling needle socket J1, an amplifier U1-A, a sampling needle connected to the sampling needle socket J1, a grounded first end of the sampling needle socket J1, a capacitor C1 and a capacitor C2 connected to the second end of the sampling needle socket J1, a grounded other end of capacitor C1, an inverting input of amplifier U1-A connected to one end of resistor R6, an output of amplifier U1-A connected to one end of resistor R2 and one end of resistor R3, a signal processing circuit, a 5V voltage connected to the other end of resistor R2, a 5V voltage connected to the other end of resistor R3, a non-inverting input of amplifier U1-A connected to the other end of resistor R4 and one end of resistor R5, and a grounded other end of resistor R5.

4. The sensitivity-adjustable liquid level detection circuit according to claim 1 or 2, characterized in that, The liquid level detection sensitivity adjustment circuit includes a toggle switch J4, model DSWB04LHGET. Pins 2, 4, 6, 8, and 10 of the toggle switch J4 are connected to ground, and pins 1, 3, 5, 7, and 9 of the toggle switch J4 are connected to the signal processing circuit.

5. The sensitivity-adjustable liquid level detection circuit according to claim 1 or 2, characterized in that, The anti-collision detection circuit includes an anti-collision socket J2, the first end of which is grounded, the second end of which is connected to one end of a resistor R8 and a signal processing circuit, a micro switch DM1-180P-1 externally connected to the anti-collision socket J2, and the other end of the resistor R8 connected to a 5V voltage.

6. The sensitivity-adjustable liquid level detection circuit according to claim 1 or 2, characterized in that, The LED display circuit includes diodes LED1 and LED2. The positive terminal of diode LED1 is connected to a 5V voltage through resistor R1, and the negative terminal of diode LED1 is connected to the signal processing circuit. The positive terminal of diode LED2 is connected to a 5V voltage, and the negative terminal of diode LED2 is connected to the signal processing circuit through resistor R7.