653 results about "Capacitive detection" patented technology

The invention discloses a multi-condition simulation capacitance detection relay life prediction method, system, equipment and medium, and relates to the technical field of relays, and the method comprises the steps: applying a plurality of simulation conditions to a relay through a programmable driving power supply, simulating the complex conditions in actual operation, and collecting the multi-dimensional parameters of the relay in real time in the execution process of the simulation conditions, extracting characteristic parameters from the collected multi-dimensional parameters, carrying out data preprocessing on the characteristic parameters, constructing a life prediction model, carrying out prediction calculation and reliability grade evaluation on the residual life of the relay by utilizing the life prediction model, and carrying out reliability grade evaluation on the residual life of the relay by monitoring capacitance change between contacts of the relay. And early performance degradation early warning is carried out in combination with a prediction result. According to the invention, through fusion of multi-working-condition simulation, hybrid modeling and capacitance detection, full-chain optimization from data acquisition, accurate prediction to early warning is realized, and the accuracy, timeliness and engineering application value of relay life prediction are improved.

The invention provides a resonance type flow field sensor with an inertia force compensation structure. The resonance type flow field sensor comprises a substrate; the double-end fixed tuning fork is fixed in the middle of the base; the cilium supporting structure is suspended on the base and is positioned at one end of the double-end fixed tuning fork; the comb tooth capacitors are arranged on the substrate and located on the two sides of the double-end fixed tuning fork; the cilia is arranged on the cilia supporting structure; one end of the micro lever is connected with the cilium supporting structure, and the other end is connected with one end of the double-end fixed tuning fork; and the inertia force compensation structure is suspended on the base, is symmetrically arranged relative to the double-end fixed tuning fork, is connected with one end of the double-end fixed tuning fork, and is positioned between the micro lever and the double-end fixed tuning fork. According to the sensor, the change of an air flow field is captured through the cilia on the sensor, the resonant frequency is detected through the capacitor, the flow velocity of the flow field can be obtained, the inertia force compensation structure can compensate interference of inertia force on an output result, and the sensor can still output stable flow velocity of the flow field when being interfered by the inertia force.

The invention belongs to the field of circuits, and particularly relates to an analog front-end circuit for capacitance detection and a current calibration method, the analog front-end circuit comprises a driving circuit, a to-be-detected capacitor, a chip signal input and output interface circuit, a current amplification circuit or charge amplification circuit, an integrating circuit and an analog-to-digital converter which are connected in sequence; the leakage current measurement and calibration controller is used for receiving a signal of the analog-to-digital converter and outputting a control signal for calibrating the leakage current to the current calibration circuit; the output end of the current calibration circuit is connected with the input end of the integrating circuit, and the current calibration circuit is used for adjusting the output of the current calibration circuit to calibrate the magnitude of the current input into the integrating circuit when receiving the control signal for calibrating the leakage current. According to the application, the leakage current measurement and calibration controller is arranged at the output end of the integrating circuit, the leakage current of the analog front-end circuit is measured, and the control signal is output to adjust the output of the current calibration circuit, so that the magnitude of the current input into the integrating circuit is calibrated, and errors caused by imbalance of the leakage current and the current of the amplifying circuit can be compensated.

The invention discloses a method for realizing a touch function on a display lamp array, an analog front end, a display panel and an electronic cigarette, and relates to the technical field of electronic cigarette display control. The method comprises the following steps: dividing display lamps of a display lamp array into a plurality of blocks according to the number of touch functions of the display lamp array, and configuring a signal transmission port for the display lamp of each block according to a corresponding lighting mode; when the current lighting cycle arrives, the display lamps of the multiple blocks are turned on at the same time, and after the display lamps are turned on, the signal transmission ports belonging to the same block are combined together; in a touch function detection period corresponding to the current lighting period, self-capacitance detection is carried out on the combined signal transmission ports; and after the touch function detection period is finished, removing the combination of the combined signal transmission ports, and waiting for the arrival of the next lighting period. According to the invention, the touch function is directly realized on the display lamp array, the cost is reduced, and the user experience is improved.

The invention discloses a vehicle exterior handle waterproof false triggering system and method based on double-frequency-point charging and discharging resonance, and relates to the technical field of automotive electronics. An electrode array composed of capacitance detection electrodes is arranged on the inner side of a vehicle exterior handle to form a vehicle exterior handle capacitance sensor; in a non-interference environment, high-frequency and low-frequency mutual capacitance reference values are collected, and a compensation parameter library is established by associating outer handle shell parameters of the vehicle; a self-capacitance channel of the electrode array is used for detecting proximity signals, high-frequency and low-frequency mutual capacitance signals are collected, and the high-frequency and low-frequency mutual capacitance signals are preprocessed; calling a compensation parameter library to correct the preprocessed high and low frequency mutual capacitance signal, and calculating the mutual capacitance increment and change slope of the high and low frequency mutual capacitance signal; based on the mutual capacitance increment and the change slope, human body touch and water interference are distinguished by analyzing high-frequency and low-frequency signals.

The invention belongs to the technical field of biological liquid sample detection, and particularly relates to a liquid path system for sample suction quality detection and an anomaly detection process. A liquid path system for sample suction quality detection comprises a capacitance detection module, an injector, a pressure detection module, a cleaning valve, a cleaning pump, a degassing module and a water tank which are connected in sequence, and the capacitance detection module, the injector, the pressure detection module, the cleaning valve, the cleaning pump, the degassing module and the water tank are connected through pipelines. The method mainly solves the following problems: 1, the contradiction between the pressure monitoring range and the monitoring resolution; 2, when the sample is insufficient or bubbles are sucked, the difference between the suction pressure and the normal liquid suction pressure is small, so that misjudgment is easily caused; 3, misjudgment is easily caused by noise signal interference; 4, corresponding error monitoring mechanisms are lacked in other processes such as cleaning, sample adding and the like; and 5, monitoring is performed by excessively depending on a single mode, and the pressure is easily interfered in the testing process.

The present invention relates to a capacitive touch input device utilizing the capacitive sensing method for detecting touch inputs from a finger or a similar conductive object. More specifically, it pertains to a capacitance detection device designed to facilitate the detection of touch coordinates based on the vertical movement of a pen by employing a capacitive detection sensor composed of a composite trapezoidal shape.

The invention discloses an electrostatic comb tooth driving MEMS micromirror with an independent electrode structure and a manufacturing method, and belongs to the field of micro-optical electro-mechanical systems, and the electrostatic comb tooth driving MEMS micromirror comprises a mirror surface, comb tooth electrodes, a comb tooth supporting structure, a torsion beam, a bonding pad, a cavity and a fixed frame. And the driving movable comb tooth electrode and the detection movable comb tooth electrode are connected with the bonding pad through the torsion beam. According to the micro-mirror, comb electrodes are divided into detection comb electrodes and driving comb electrodes by filling isolation channels, and parasitic capacitance is reduced by removing silicon substrates at the bottoms of the comb electrodes, so that feed-through interference of driving signals on detection signals is avoided, and the capacitance detection precision of the electrostatic MEMS micro-mirror is improved. According to the back cavity etching priority sequence, the invention further discloses two manufacturing methods of the electrostatic MEMS micromirror with the independent electrode structure, and according to the manufacturing methods of the electrostatic MEMS micromirror, the isolation and interconnection of different comb teeth electrodes are realized by filling a channel, an insulating layer and a metal wire with a polymer.

The embodiment of the invention provides a temperature detection circuit and method and electronic equipment, and the circuit comprises a temperature detection module which comprises a detection capacitor; the detection capacitor is used for generating a corresponding capacitance value according to the internal temperature of the electronic equipment; the conversion module is connected with the detection capacitor, and the conversion module is used for controlling the detection capacitor to charge and discharge repeatedly under the corresponding capacitance value and outputting a square wave signal according to the charge and discharge state; and the control module is connected with the conversion module and is used for acquiring the corresponding internal temperature according to the square wave signal. According to the electronic equipment, the detection capacitor is used for replacing a thermistor or a temperature sensor in an existing scheme to detect the temperature of the electronic equipment, and the detection capacitor has a direct current blocking effect, so that quiescent current cannot be generated, and the effect of reducing static power consumption can be achieved.

The invention provides an MEMS inertial biaxial sensor, which comprises a sensitive mass block, a plurality of first direction detection modules and a plurality of second direction detection modules, and is characterized in that the plurality of first direction detection modules are symmetrically distributed at two ends of the sensitive mass block along a first direction and are connected with the sensitive mass block through a first direction vibration transmission beam, and the plurality of second direction detection modules are symmetrically distributed at two ends of the sensitive mass block along a second direction; the second direction detection modules are symmetrically distributed at the two ends of the sensitive mass block in the second direction and connected with the sensitive mass block through vibration decoupling elastic assemblies, and the adjacent second direction detection modules are connected through truss assemblies. An integrated structural form is adopted, and the first direction detection module and the second direction detection module are symmetrically arranged on the two sides of the sensitive mass block, so that differential capacitance is formed during vibration, a capacitance detection signal is increased, a common-mode error signal is subtracted from difference, and the capacitance signal detection sensitivity is improved.

The invention provides a capacitance detection method, system and device and a storage medium, and relates to the technical field of capacitance detection. The method comprises the following steps: acquiring a capacitance type and a parameter range of a measured capacitor, and matching with a preset resonance library according to the capacitance type and the parameter range to obtain a target resonance inductance parameter; constructing a target LC resonance test circuit based on the target resonance inductance parameter, the capacitor type and the parameter range, and measuring the tested capacitor based on the target LC resonance test circuit to obtain resonance response data; and analyzing the resonance response data to obtain a capacitance performance index. Through the scheme, the capacitor testing efficiency is improved.

The embodiment of the invention provides a chip for perfecting a function safety mechanism and a capacitance detection circuit thereof. The capacitance detection circuit comprises a detection module and a logic processing module, the detection module detects an output current of a power tube in a soft start process of a chip to obtain an output detection current and determines a current detection signal according to whether the output detection current is greater than a preset current, and the logic processing module outputs a current detection signal after the soft start of the chip is finished. According to whether the current detection signal is greater than the preset voltage or not, the capacitor state indication signal is determined, an off-chip capacitor can be indicated to be abnormal when the output current of the power tube is abnormal, and the off-chip capacitor can be indicated to be normal when the output current of the power tube is normal, so that indication can be performed when the off-chip capacitor is abnormal so as to perfect a function safety mechanism of a chip; and meanwhile, the output voltage of the power tube is not influenced, so that the normal starting of the chip is not influenced.

The invention belongs to the technical field of detection, and particularly relates to a capacitance detection system for a pipetting steel needle and a capacitance signal processing method. The system comprises a pipetting needle, a capacitance voltage division circuit, a frequency selection circuit, a peak detection circuit and a subtraction amplification circuit which are connected in sequence. The capacitance voltage division circuit is connected with a signal generation circuit; the subtraction amplification circuit comprises a processing unit circuit, the processing unit circuit comprises a signal processor, and the signal processor is an MCU unit with an ADC-1, an ADC-2 and a DAC; the peak detection circuit outputs an S0 signal, and the S0 signal is accessed to ADC-1 of the processing unit circuit; a bias voltage VBias is subtracted from the S0 signal output by the peak detection circuit at the same time to obtain a V1 signal, and the bias voltage VBias is given by a DAC (Digital-to-Analog Converter); and the V1 signal from which the VBias is subtracted is further amplified. The method is high in detection response speed and can be applied to high-speed instruments.

The invention provides a YOLO-based ox horn capacitor bushing polarity detection method and system, and the method comprises the following steps: a data set construction step: carrying out the preprocessing of an ox horn capacitor detection video, and obtaining a data set; a model optimization step: optimizing the YOLO detection model, and constructing a target detection model; a training iteration step: performing training iteration on the target detection model through the data set; and a detection and judgment step: detecting the ox horn capacitor detection video through the target detection model after training iteration, and judging whether the printing of the ox horn capacitor is wrong or not. By adopting the improved YOLOv8 structure, the problem of low horn capacitance detection recognition rate is solved, so that the effect of accurate horn capacitance detection is achieved.

The invention discloses a detection device and a detection system for harmonic oscillator capacitors of a hemispherical resonator gyroscope, and relates to the technical field of capacitor detection, the detection device comprises a signal detection circuit, a modulation compensation circuit, a differential amplification circuit and a control circuit, the signal detection circuit is connected with the output ends of the two harmonic oscillator capacitors; the modulation compensation circuit is correspondingly connected with two input ends of the signal detection circuit; the differential amplification circuit is correspondingly connected with two output ends of the signal detection circuit; the control circuit is configured to output modulation voltage to the two input ends of the modulation compensation circuit according to a voltage signal of the output end of the differential amplification circuit, and zero setting is carried out on voltage at the connecting positions of the two output ends of the modulation compensation circuit and the two input ends of the signal detection circuit. According to the invention, the modulation compensation circuit is adopted to enable the output ends of the two harmonic oscillator capacitors to work near zero voltage, the circuit has the characteristics of ultrahigh linearity, extremely low temperature drift, rapidness and stability, errors caused by power supply drift can be eliminated, and the detection precision is improved.

The embodiment of the utility model provides a detection circuit based on an electronic cigarette and the electronic cigarette, and belongs to the technical field of detection circuits. The detection circuit comprises a capacitive detection module and a main control module, wherein the main control module comprises an oscillation unit, a counting unit and a control unit; the oscillating unit is electrically connected with the capacitive detection module; the counting unit is electrically connected with the oscillating unit and the main control unit; the capacitance type detection module is used for enabling the capacitance value of the capacitance type detection module to change when the air flow changes; the oscillation unit is used for outputting corresponding oscillation frequency when the capacitance value of the capacitive detection module changes; the counting unit is used for detecting oscillation frequency output by the main control module to obtain target working frequency; the control unit is used for determining the suction detection result according to the target working frequency and the preset oscillation frequency. According to the embodiment of the invention, the detection cost of the smoking action can be reduced, and the cost of an electronic cigarette product is reduced.

The present invention provides an improved capacitive bead sensor for detecting and / or quantifying a target analyte in a sample wherein the detection limit is as low as a single bead, the capacitive bead sensor can be repeatedly used for multiple bead testing or continuous bead flow, and the capacitive bead sensor is readily manufacturable and automatable. By using various structural advantages and electronic signal amplification techniques, the capacitive bead sensor enables sensitivity as low as single molecule detection without the need for enzymatic amplification such as PCR, these various structural advantages and electronic signal amplification techniques further allow for multiplex target detection not only across various nucleic acid targets but across the entire target class, thereby allowing for simultaneous detection of, for example, viral nucleic acids and host antibodies against these viruses.

The present application provides a battery water content detection method, device, electronic device and storage medium. The method includes: measuring and obtaining the capacitance detection value of the battery to be tested; determining the first water content value of the battery to be tested according to the capacitance detection value and the capacitance water content relationship model; wherein the capacitance water content relationship model is obtained according to the correspondence between sample batteries with different water content values ​​and their sample capacitance values. The present application pre-constructs the correspondence between the water content of the sample battery and the sample capacitance value, and determines the water content of the battery to be tested according to the correspondence and the capacitance value of the battery to be tested, thereby reducing the steps of manually cutting the electrode piece and improving the efficiency of battery water content detection.

In a steering wheel unit, when any one of electrostatic capacitances measured by a capacitance measurer while a self capacitance detection mode is set by a mode switcher is equal to or larger than a first threshold value, it is determined that the operator's hand is in contact with a rim at a position that overlaps at least one of electrodes. When the electrostatic capacitance is equal to or larger than a second threshold value, which is smaller than a first threshold value, and smaller than the first threshold value, the mode is switched to the mutual capacitance detection mode. After the switching, when an electrostatic capacitance newly measured in the mutual capacitance detection mode is equal to or larger than a third threshold value, it is determined that the operator's hand is in contact with the rim at a position that overlaps a gap between the electrodes.

The invention discloses an anti-interference circuit and method for capacitance detection, and the circuit comprises a to-be-measured unit which is provided with a to-be-measured capacitor, a reference voltage and a common-mode voltage, the first end of the to-be-measured capacitor is selectively connected with the reference voltage and the common-mode voltage, and the second end of the to-be-measured capacitor is connected with a ground potential; the quantization unit is connected with the to-be-measured unit and the integration unit and is used for quantizing an integration capacitor in the integration unit; the integration unit comprises an integrator and an integration capacitor, and the input end of the integration unit is connected with the unit to be measured; the counting unit is connected with the output end of the integration unit; wherein the integrating capacitor comprises a first integrating capacitor and a second integrating capacitor, the first integrating capacitor and the second integrating capacitor are connected in parallel, and the quantization unit quantizes the first integrating capacitor and the second integrating capacitor respectively.

The utility model provides a capacitor withstand voltage tester which comprises a control system, a power supply, a high-voltage programmable power supply and a display module, the power supply, the high-voltage programmable power supply and the display module are connected to the control system, a main control module, a capacitor withstand voltage test module, a power conversion module and a communication module are arranged in the control system, and the capacitor withstand voltage test module, the power conversion module and the communication module are connected with the main control module; the capacitor withstand voltage test module is connected with the capacitor test clamp, the capacitor test clamp is connected with the high-voltage programmable power supply, the capacitor test clamp is used for placing a to-be-tested capacitor, the capacitor withstand voltage test module is used for carrying out withstand voltage test on the to-be-tested capacitor, and the high-voltage programmable power supply is used for providing a high-voltage voltage source and carrying out power supply voltage configuration through the communication module; the power supply conversion module is connected with a power supply and converts external power supply voltage into working voltage of each module, and the display module provides interface display. According to the invention, multiple channels of capacitors can be tested at the same time, the channels do not influence each other, the convenience of capacitor detection in the design and production process of automobile electronic control products is high, and the cost is low.

The invention discloses an anomaly detection method and device for a screen, and relates to the field of lithium batteries, in the running process of the screen, a first actual capacitance value, obtained by a first capacitance detector, of a first area in the screen is corrected to obtain a target capacitance value, and then whether the screen is abnormal or not is judged based on the target capacitance value and a calibrated capacitance value. Therefore, whether the screen is abnormal or not can be monitored in real time according to the detected capacitance value, the reliability of screening of the positive electrode material is improved, the problems of product quality and equipment failure caused by low reliability of screening of the positive electrode material are effectively avoided, and meanwhile the problem of cost waste caused by the fact that the screen cannot be replaced in time is avoided. And the first actual capacitance value is corrected to reduce the influence of environmental factors on the capacitance value detected by the first capacitance detector, so that the accuracy of the target capacitance value is improved, the accuracy of judging whether the screen is abnormal or not is improved, and the reliability of screening the positive electrode material is improved.

The embodiment of the invention provides a capacitance detection unit, a touch device and interactive equipment. The capacitance detection unit controls starting and ending of a sampling process through a sampling module, guarantees accuracy of sampling control starting time and ending time, and can adjust sampling time according to sampling requirements so as to improve sampling precision or reduce sampling energy consumption. Charges of a modulation capacitor are transferred to an induction capacitor in a charging and discharging mode, then the modulation capacitor is charged to supplement charges lost due to charging, and capacitance change sampling of the induction capacitor is transferred to charging time sampling of the modulation capacitor. Therefore, not only can electrical isolation between the induction capacitor and the sampling module be realized and interference be reduced, but also the stability of the high-level signal and the low-level signal obtained by sampling can be improved, so that sampling errors caused by other factors in the circuit can be reduced through the high-level signal and the low-level signal, and the sampling accuracy is improved. And the capacitance detection precision can be improved.

The invention provides a capacitor capacity detection circuit, a capacitor capacity detection method and a related device, which are applied to the technical field of capacitor detection. The detection circuit comprises a reference capacitor, a detection module and a processing module. The processing module is electrically connected with the reference capacitor and used for sending out a control signal. The detection module is electrically connected with the reference capacitor, the detection module is electrically connected with the processing module, and the detection module is used for detecting a feedback signal of the reference capacitor under the action of the control signal and sending detection information obtained through detection to the processing module. The processing module is further used for determining the capacitance value of the reference capacitor according to the detection information, comparing the capacitance value of the reference capacitor with an early warning threshold value, and sending out early warning information when the capacitance value of the reference capacitor is smaller than the early warning threshold value. By monitoring the capacitance value of the reference capacitor in real time, online monitoring of the capacitance of the target capacitor can be realized, so that the fault of the target capacitor can be warned in advance, and the reliability of the circuit board is improved.

The embodiment of the invention relates to a touch control detection method, a touch control electrode structure and computer equipment, the touch control detection method comprises the steps that capacitance detection values corresponding to a plurality of touch control output signals sent by the touch control electrode structure in a preset time period are acquired, and the capacitance detection values are associated with touch control actions of a user; determining whether conductive liquid exists in an induction area of the touch electrode structure or not according to the capacitance detection values; under the condition that the existence of the conductive liquid is determined, a capacitance threshold value of touch detection is adjusted; and according to the adjusted capacitance threshold value and a capacitance detection value obtained in real time, judging whether a touch action exists in an induction area of the touch electrode structure or not.

The invention discloses a reactive compensation equipment fault automatic early warning system based on an intelligent algorithm, which belongs to the technical field of intelligent power grids and comprises a fault data acquisition module, a feature processing module, a fault diagnosis and evaluation module and a visualization module. Matlab software, Simulink software, a configurable point fast Fourier transform algorithm, a fluorescence imaging technology, a capacitive detection technology and a related intelligent algorithm are combined, reactive power compensation equipment fault analysis is carried out from three angles of a lightning arrester, a capacitor and a reactor, and the fault of the reactive power compensation equipment is analyzed in a chart form. And the visual output of the output result of the reactive power compensation equipment fault diagnosis model is realized. According to the invention, intelligent and precise diagnosis and visual early warning of reactive power compensation equipment faults are realized by comprehensively collecting multi-dimensional data of the lightning arrester, the capacitor, the reactor and overall compensation.

A sensor arrangement for capacitive detection of an object, including: an electrode arrangement having a heating element as an electrode; a detection device providing a detection signal to a sensor electrode and capacitively detecting the presence of an object near the sensor electrode; a high-side switch connected between a heating power source having a first potential and the heating element; a low-side switch connected between the heating element and a second potential; and a gate controller closing the high-side switch and low-side switch in a heating mode and opening the high-side switch and low-side switch in a detection mode. A decoupling MOSFET is connected between the high-side switch and heating element. The gate controller closes the MOSFET in the heating mode and opens the MOSFET in the detection mode. During the detection mode, the decoupling circuit provides a third potential at a first node between the high-side switch and MOSFET.

The invention relates to a circuit board backdrill capacitance testing method, device and equipment and a storage medium, and the method comprises the steps: obtaining a capacitance detection instruction, and obtaining the image information of a to-be-detected circuit board according to the capacitance detection instruction; carrying out clustering analysis on the image information of the to-be-detected circuit board by adopting a k-means algorithm to obtain a feature image of the to-be-detected circuit board, and carrying out analysis according to the feature image to obtain a displacement distance and an angle of the probe; adjusting the position of the probe according to the displacement distance and the angle of the probe, and generating a capacitance measurement message after the adjustment of the probe is completed; according to the capacitance measurement message, calculating a capacitance value of the circuit board to be detected through a capacitance method, and comparing the capacitance value of the circuit board to be detected with a preset capacitance value to obtain a capacitance comparison result; and generating a quality evaluation result of the back drilling hole of the circuit board according to the capacitance comparison result, and transmitting the quality evaluation result of the back drilling hole of the circuit board to the user side. The method has the effect of improving the precision and efficiency of back drilling hole quality detection.

The utility model discloses a capacitor service life test clamp, and relates to the technical field of capacitor detection, the capacitor service life test clamp comprises a clamping box with one end provided with an opening, a clamping structure is arranged in the clamping box, and four corners of the upper and lower surfaces of the clamping box are fixedly connected with connecting rods. Through cooperative arrangement of the clamping box, the first clamping hole, the clamping plate, the second clamping hole, a spring and other structures, during use, the clamping plate is pushed to enable the first clamping hole and the second clamping hole to be aligned, the middle section of the capacitor penetrates through the first clamping hole and the second clamping hole, the clamping plate is loosened, the clamping plate moves under the action of the elastic force of the spring, and the capacitor is clamped. The inner walls of the first clamping hole and the second clamping hole clamp the capacitor from the two sides, the end of the capacitor is not subjected to clamping acting force, and it is avoided as much as possible that when a traditional test clamp fixes the capacitor, certain pressure is applied to the two ends of the capacitor, oxidation or falling off of a tin coating at the end of the capacitor is likely to be accelerated, weldability of the capacitor is reduced, and the service life of the capacitor is prolonged. And the reliability of the capacitor is influenced.

The invention provides a liquid level sensor, a liquid level detection method, a computer storage medium and electronic equipment. The liquid level sensor comprises a capacitance sensing unit, a capacitance detection unit and a capacitance processing unit. The capacitance sensing unit comprises a comb-tooth-shaped structure, and the comb-tooth-shaped structure and the outer wall face of the liquid container are attached to form a capacitor together; the capacitance detection unit is connected with the capacitance sensing unit and is used for detecting the capacitance value of the capacitor and transmitting the capacitance value to the capacitance processing unit; and the capacitance processing unit is connected with the capacitance detection unit and is used for acquiring the liquid level height of the liquid in the liquid container according to the received capacitance value. According to the liquid level detection device, the influence of liquid hanging in the liquid container on liquid level height detection can be reduced, and the liquid level height detection accuracy is improved.