517 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 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 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 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.

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 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.

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.

A microelectromechanical sensor component. The component includes: a substrate; a movable sensor structure connected to the substrate and having a seismic mass portion and a deflection electrode arranged thereon; and at least one evaluation electrode arranged on the substrate. The deflection electrode is arranged so as to be movable relative to the evaluation electrode. The evaluation electrode is configured for capacitive detection of a deflection of the deflection electrode. The deflection electrode and the evaluation electrode form a comb structure. The deflection electrode has a plurality of deflection electrode fingers extending from a deflection electrode bar in the direction of the evaluation electrode. The evaluation electrode has a plurality of evaluation electrode fingers extending, parallel at least in portions to the deflection electrode fingers, from an evaluation electrode bar in the direction of the deflection electrode.

The invention relates to the technical field of capacitance detection circuits, in particular to a capacitance detection circuit based on practical differential and peak detection. According to the circuit, a practical differentiating circuit model is constructed, a capacitance value to be measured is converted into a sinusoidal signal output by a differentiating circuit, then the sinusoidal signal is converted into stable direct-current voltage by utilizing a peak holding circuit, and finally the voltage is read by a single chip microcomputer and the capacitance value is calculated. The whole circuit is simply designed, a practical differentiating circuit and a peak holding circuit serve as cores, linear conversion from weak capacitance to direct-current voltage is achieved, and a complex circuit structure of traditional capacitance detection is avoided. Through circuit structure optimization, stray capacitance interference is effectively suppressed, the detection anti-interference capability is improved, through experimental test verification, a thought and a theoretical model are provided for reading the capacitance value of the capacitance sensor, and the method has certain engineering value for application of a weak capacitance sensor.

An environmental detection device including a housing, a capacitance detection circuit comprising a capacitor within the housing, and a chamber within the housing. The chamber including an air inlet to allow air to pass through the housing into the chamber and an environmental sensor to detect an environmental characteristic. The device including a first mesh structure at least partially covering the air inlet of the chamber, a first metallic conductor comprising at least a first portion of the first mesh structure, a second metallic conductor separated from the first metallic conductor by at least one dielectric material, a first electrical connection from the first metallic conductor to the relaxation oscillator circuit, and a second electrical connection from the second metallic conductor to a ground, wherein the first metallic conductor and the second metallic conductor form the capacitor of the relaxation oscillator circuit.

The invention relates to the technical field of camera shooting, and discloses a ball type anti-shake motor and electronic equipment. According to the ball type anti-shake motor, a circuit board is provided with an emitting polar plate, a first rotor is provided with a first floating polar plate, and a second rotor is provided with a second floating polar plate opposite to the first floating polar plate; a first receiving polar plate is further arranged on the circuit board, and the first receiving polar plate and the first floating polar plate are oppositely arranged; the first receiving polar plate and the first floating polar plate form a first capacitor, the first floating polar plate and the second floating polar plate form a second capacitor, the second floating polar plate and the shell are oppositely arranged to form a third capacitor, and the transmitting polar plate and the first floating polar plate form a fourth capacitor; a series capacitor and parallel capacitor combined capacitive detection unit is constructed by the plurality of capacitors, and the detection result of the capacitive detection unit is changed through the change of the parallel capacitance value, so that the sensitivity of position detection is improved.

The invention discloses a dynamic liquid level detection system and method based on a capacitance-photoelectric dual-mode sensor, and the system comprises a dual-mode sensor module which comprises a capacitance sensor used for measuring the capacitance value change caused by the liquid level change; the photoelectric sensor is used for measuring the light intensity change caused by the liquid level change; the signal processing module is used for processing original signals of the capacitive sensor and the photoelectric sensor; the dynamic calibration module comprises a temperature sensor and a microcontroller MCU, and the microcontroller MCU is configured to receive and process the signal from the signal processing module; dynamically adjusting the excitation frequency of the capacitive sensor according to the temperature value read by the temperature sensor and a preset sample viscosity type; based on a self-adaptive weighted fusion algorithm, fusing the processed capacitance signal and the photoelectric signal, and outputting final liquid level information; and when bubbles are detected, the control system is switched to a pure capacitance detection mode. According to the invention, high-precision liquid level detection can be realized.

The present invention relates to the field of capacitance detection technology, and specifically to a capacitor testing device and testing method, comprising: a bottom disc, an outer circular end of which is rotatably connected to a rotating table, and five first slots are arranged on the circumference of the top of the rotating table; a transmission motor, a transmission plate is fixedly connected to the main shaft of the transmission motor, and the top of the transmission plate is fixedly connected to the rotating table; a top transmission structure is fixedly connected to the bottom disc; a bottom transmission structure is on the bottom disc; a capacitance detection blanking module is fixedly connected to each first slot, and the capacitance detection blanking module is transmission-connected to the top transmission structure; each capacitance detection blanking module is correspondingly provided with a transmission assembly, and the transmission assembly is fixedly connected to the upper end of the inner bottom of the rotating table, each transmission assembly is located directly below the corresponding capacitance detection blanking module, and each transmission assembly is transmission-connected to the bottom transmission structure; the present invention eliminates unqualified capacitors and performs cyclic detection.

The application provides a capacitor detection circuit, method, chip and electronic equipment. The capacitor detection circuit comprises a capacitor collection module, a switch module and a target collection port. The capacitor collection module is electrically connected with the target collection port through the switch module, and a first capacitor sensing signal and a second capacitor sensing signal corresponding to the target collection port are obtained. The first capacitor sensing signal is a signal when the switch module is turned on, and the second capacitor sensing signal is a signal when the switch module is turned off. The capacitor collection module further determines a target capacitor sensing value according to the first capacitor sensing signal and the second capacitor sensing signal through a preset mode. Thus, the capacitor sensing value of a single target detection port avoiding temperature drift is detected by using only one signal collection port, the communication port occupation of the capacitor collection module is reduced, the capacitor detection cost is reduced, and the accuracy of the capacitor sensing value is ensured.

The invention relates to the technical field of automobile part welding, and particularly discloses a left front longitudinal beam outer plate subassembly detecting and fixing device which comprises a tool, a supporting rod, a capacitive detection switch, an acquisition module and a PLC system, the tool is used for installing a left front longitudinal beam outer plate subassembly, the tool accurately positions the left front longitudinal beam outer plate subassembly to ensure that a welding path is accurate, and the supporting rod is used for supporting the supporting rod. The supporting rod is installed at the upper end of the tool, the capacitive detection switch is installed at the upper end of the supporting rod and used for detecting a contact tube of the welding robot, the capacitive detection switch is in communication connection with the collecting module, the collecting module is used for collecting signals of the capacitive detection switch, and the collecting module is in communication connection with the PLC system. The acquisition module transmits a detection signal of the capacitive detection switch to the PLC system, the PLC system is used for controlling the operation of the welding robot, the PLC system is further electrically connected with an alarm module, the device can find the position deviation of the contact tube in time, the position of the contact tube can be conveniently corrected or replaced, and the welding quality is effectively improved.

A sensing and heating device for capacitive detection of an object in a motor vehicle includes a heater element having a first terminal and a second terminal, a heater circuit including a heating power source and a heater electronic control unit (HCU), the heater circuit configured to supply a heating current to the first and second terminals of the heater element, an AC decoupling element connected between the first and second terminals of the heater element and the heater circuit; and a capacitive sensing unit configured to use the heater element as a first antenna electrode, the capacitive sensing unit comprising a sensing circuit and a signal sensing circuit, the sensing circuit comprising a signal generating unit configured to apply an AC measurement signal to one of the first and second terminals of the heater element, the signal sensing circuit includes a current measurement device configured to sense a current flowing into the heater element in response to an applied AC measurement signal. The AC decoupling element includes a vehicle clock spring mounted between a steering wheel and a steering column of the vehicle.

The present application relates to the technical field of circuit, in particular to a non-mechanical touch button detection circuit and method.The non-mechanical touch button detection circuit provided by the present application comprises a plurality of external IO channels for connecting external sensors, a detection circuit main body comprising a plurality of function detection channels, at least including a capacitance detection channel and a pressure detection channel, and a programmable analog array switch configured to selectively switch any one or more of the external IO channels to the corresponding one or more function detection channels based on different detection modes, to realize multiplexing or combination of capacitance detection function, pressure detection function or capacitance and pressure fusion detection function.The present application realizes deep fusion and flexible reconstruction of capacitance detection and pressure detection through the programmable analog array switch, realizes automatic adaptation and time division multiplexing of a single chip to multiple detection modes, and improves the versatility, reliability and environmental adaptability of the touch button.

A monitoring device for monitoring lubricating oil (20) in a compressor (10), the monitoring device comprising: a first capacitance detector (100) arranged in the compressor (10) and completely immersed in the lubricating oil (20) in the compressor (10) and adapted to detect a first capacitance value C 11 to detect; a calculation unit for calculating a relative dielectric constant ε r of the lubricating oil (20) in the compressor (10) according to the first capacitance value C detected by the first capacitance detector (100) 11 ; and a determination unit for monitoring according to the calculated relative dielectric constant ε r whether the quality of the lubricating oil (20) in the compressor (10) is abnormal, the monitoring device further comprising: a second capacity detector (200) arranged vertically in the compressor (10), where the calculation unit based on the calculated relative dielectric constant ε r of the lubricating oil (20) in the compressor (10) and a second capacity value C 21 detected by the second capacitance detector (200) arranged vertically in the compressor (10), calculates a depth H to which the second capacitance detector (200) is immersed in the lubricating oil (20) in the compressor (10), wherein: the relative dielectric constant ε r of the lubricating oil (20) in the compressor (10) is calculated according to formula (1): ε r = C 11 C 10 where C 10is a capacitance value detected by the first capacitance detector (100) in vacuum, characterized in that the depth H to which the second capacitance detector (200) is immersed in the lubricating oil (20) is calculated according to formula (2): H = L ∗ ( C 21 − C 20 ) ( ε r − 1 ) ∗ C 20 where C 20 is a capacitance value detected by the second capacitance detector (200) in air, and L is the length of the second capacitance detector (200) in a vertical direction.

The invention relates to the technical field of capacitance detection circuits, in particular to a capacitance digital conversion circuit based on phase-sensitive integration. The circuit comprises a phase shift circuit unit, a capacitance detection unit, a phase control unit and a digital processing unit. According to the invention, an excitation signal is converted into an excitation signal which is 90 degrees ahead by using a phase shift circuit through a phase shift circuit unit, a capacitance detection unit controls a single-pole double-throw switch S1 to alternately access the excitation signal and an inversion signal to a to-be-detected capacitor Cx and a reference capacitor C0, and a phase control unit utilizes integration-deintegration double stages in an integration stage. Phase signals are converted into high and low levels through a comparator so as to control overturning of a capacitor CF pole plate, the digital processing unit carries out phase sampling counting at 0 degree and 180 degrees, the capacitance value is calculated according to the ratio of the number of integration cycles to the number of deintegration half cycles, the influence of stray capacitance is reduced, and the measurement precision is improved.

The application discloses a dual-frequency charging and discharging resonance-based waterproof false triggering system and method for an outside handle of a vehicle, and relates to the technical field of automobile electronics.The electrode array formed by the capacitor detection electrode is arranged on the inner side of the outside handle of the vehicle to form a capacitive sensor for the outside handle of the vehicle; in an interference-free environment, the high-frequency and low-frequency mutual-capacitance reference values are collected, and the compensation parameter library is established in association with the parameters of the shell of the outside handle of the vehicle; the proximity signal is detected by using the self-capacitance channel of the electrode array, the high-frequency and low-frequency mutual-capacitance signals are collected, and the high-frequency and low-frequency mutual-capacitance signals are preprocessed; the high-frequency and low-frequency mutual-capacitance signals after the preprocessing are corrected by calling the compensation parameter library, the mutual-capacitance increment and the change slope of the high-frequency and low-frequency mutual-capacitance signals are calculated; and the human body touch and the water interference are distinguished by analyzing the high-frequency and low-frequency signals based on the mutual-capacitance increment and the change slope.

The present invention relates to the CDA that constitutes the capacitive detection device of the present invention placed on the upper side of the conductor. It aims to narrow the width of the far-distance CDA signal line, which was previously widened to reduce resistance, to be the same as the width of the near-distance signal line. As a result, this reduces the time constant in the far-distance CDA, enhancing the detection speed, and minimizes the width of the Dead Zone caused by the signal line, thereby reducing object detection errors or touch coordinate calculation errors.

The invention relates to a capacitance detection circuit, device and method, a first power supply circuit and a second power supply circuit respectively provide the same voltage for a counting oscillation circuit and a detection oscillation circuit, so that the counting oscillation circuit and the detection oscillation circuit work in the same power supply environment, and capacitance detection is realized. By configuring the power supply circuit in the capacitance detection circuit for power supply, the interference of the environmental space on the power supply can be effectively reduced. Meanwhile, the counting oscillation circuit and the detection oscillation circuit are respectively provided with a power supply circuit, crosstalk between a counting channel and a detection channel can be avoided, and capacitance detection can be accurately achieved when the frequency of the detection oscillation circuit is close to the integral multiple frequency of the counting oscillation circuit. Therefore, the anti-interference capability of the capacitance detection circuit can be improved, and the problem that the detection sensitivity is reduced due to interference is solved.

The invention discloses a parallel pole plate type anti-interference capacitive detection device which comprises two pole plates and a supporting plate. The circuit also comprises an equipotential driving circuit. The pole plate comprises four layers of pole plate base materials, wherein the first layer of pole plate base material is provided with an electrode bonding pad and a protection ring bonding pad; on the second-layer polar plate base material, a copper layer is covered in an area with a preset distance from the edge of the second-layer polar plate base material to form an equipotential protection layer; a middle electrode body and an equipotential protection ring arranged around the electrode body are arranged on the third layer of polar plate base material; the equipotential protection ring, the equipotential protection layer and the protection ring bonding pad are in conduction connection; the electrode body is conductively connected with the electrode bonding pad; the fourth layer of polar plate base material is an insulating layer; the equipotential driving circuit is connected with the electrode body and the equipotential protection ring. According to the detection device, the four-layer polar plate base material design is adopted, and particularly the equipotential protection layer and the equipotential protection ring are arranged, so that the influence of edge additional capacitance can be effectively reduced, the electric field distribution is optimized, and the accuracy of capacitance detection is ensured.