399 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 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 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.

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.

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 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 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.

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 kettle comprises a kettle body and a water level detection assembly, the water level detection assembly comprises a capacitance detection plate provided with a plurality of conductive protrusions, an installation frame arranged around the capacitance detection plate and a plurality of conductive filling pieces, the installation frame is fixed to the outer side wall of the kettle body, and the conductive filling pieces and the conductive protrusions are arranged in a one-to-one correspondence mode. And the conductive filling pieces are respectively filled in gaps between the corresponding conductive bulges and the kettle body. According to the utility model, the conductive filling piece is arranged between each conductive bulge and the kettle body, so that the gap between each conductive bulge and the kettle body is filled, and the influence of humidity change in the gap between each conductive bulge and the kettle body on the accuracy of capacitance detection is avoided; and the influence on the accuracy of capacitance detection due to different distances between the conductive bulges and the kettle body is avoided, so that the detection of the capacitance detection plate on the water level in the kettle body is more accurate and reliable.

A drive apparatus for driving a semiconductor light-emitting device. The drive apparatus comprises an input interface, which is used for connecting to a mains input; and an output interface, which is connected in series to a linear drive circuit and is used for connecting to a semiconductor light-emitting device by means of the linear drive circuit. The drive apparatus further comprises: a mains frequency and voltage regulation circuit, which is coupled between the input interface and the linear drive circuit, and is used for performing power conversion at a mains frequency and changing the voltage amplitude of the mains input, which is provided to the linear drive circuit, wherein the mains frequency and voltage regulation circuit comprises a capacitor that is used for charging and discharging at the mains frequency; a detection circuit, which is used for detecting a signal related to the voltage of the mains input; and a control circuit, which is used for selectively activating or deactivating the mains frequency and voltage regulation circuit on the basis of the signal detected by the detection circuit.

The invention relates to a multifunctional liquid level detection method, which comprises the following steps of: 1, sending an instruction and initializing an MCU (Microprogrammed Control Unit) through an upper computer, and determining a detection task and an initial parameter; step 2, on the basis of the initialization parameters in the step 1, a sampling needle is put into a test tube to scan a capacitance detection module, and the capacitance detection module captures a capacitance change signal after the sampling needle is in contact with the liquid level; the sampling needle is of a double-needle-tube structure comprising a sampling needle tube and a mixing needle tube; 3, on the basis of the capacitance change signal in the step 2, liquid level position judgment and sample size state judgment are completed through MCU algorithm processing; and step 4, based on a sample size judgment result in the step 3, respectively completing mixing or direct sampling operation through function division and hardware cooperation of the sampling needle tube and the mixing needle tube. The method has the advantages that the accuracy is greatly improved, the anti-interference capacity is high, and the operation process is simplified.

The rocker assembly comprises a mounting seat, a rocker and a first capacitance detection assembly, the rocker is movably arranged on the mounting seat, and the first capacitance detection assembly comprises a dielectric plate, a first detection polar plate, a second detection polar plate and a compensation polar plate. The first detection polar plate, the second detection polar plate and the compensation polar plate are respectively fixed relative to the position of the mounting seat, the first detection polar plate and the second detection polar plate are arranged at intervals and form a detection capacitor, the dielectric plate is arranged between the first detection polar plate and the second detection polar plate, and the dielectric plate is linked with the rocker to be driven to move relative to the detection capacitor; the compensation polar plate and the first detection polar plate are arranged at an interval and form a compensation capacitor, the relative movement of the dielectric plate and the detection capacitor can cause the capacitance value change of the detection capacitor, and the compensation capacitor can be used for detecting the influence of environmental factors such as temperature and humidity on the capacitance value, so that the detection of the detection capacitor can be compensated. The motion detection precision of the rocker is ensured.

To provide a sheet feeding device capable of reducing erroneous detection of sheet sizes.SOLUTION: A side guide 3 regulates the position of paper P loaded in a paper tray 2. The side guide 3 is movable in the front-to-rear direction. Detection electrodes 5A to 5C are each formed by a pair of electrodes 16A and 16B, and are each arranged at a predetermined position in the paper tray 2. A capacitance detection unit 7 detects the capacitance of each of the detection electrodes 5A to 5C. A control unit 8 detects the size of the paper P in the front-to-rear direction and the position of the side guide 3 based on the capacitance of each of the detection electrodes 5A to 5C detected by the capacitance detection unit 7.SELECTED DRAWING: Figure 2

The invention relates to a system (1) for detecting an activation action within an activation area (200) for a vehicle (2), having a sensor mechanism (30) for capacitive detection (250) of an approach at least partially in the activation area (200) for detecting the activation action, a communication mechanism (10) for performing a communication (240) at least partially in the activation area (200), a monitoring mechanism (20) for initiating a suspension (230) and / or a restart (210) of the capacitive detection (250) depending on the communication (240).

This invention discloses a hygrometer, comprising a humidity sensor, a capacitance detection module, a backflushing module, and a main controller. The humidity sensor is used to detect the humidity of the environment to be tested. The capacitance detection module is electrically connected to the humidity sensor and is used to measure the capacitance value of the humidity sensor. The backflushing module is used to deliver cleaning gas to the humidity sensor to clean it. The main controller is electrically connected to the capacitance detection module and the backflushing module, and is used to adjust the capacitance bias of the capacitance detection module based on the capacitance detection results and to perform automatic zero calibration to optimize humidity measurement. This invention improves the accuracy of measured humidity data.

The invention belongs to the technical field of electronic cigarettes, and particularly relates to an electronic cigarette recognition system and an electronic cigarette recognition method.The electronic cigarette recognition system comprises a capacitance detection module, a detection pad and a main control module; the detection pad is electrically connected with the signal input end of the capacitance detection module and configured to sense capacitance changes of the electronic cigarette body head portion, the electronic cigarette middle insulation portion and the electronic cigarette holder portion, convert the capacitance changes into capacitance signals and transmit the capacitance signals to the capacitance detection module. Capacitance changes of the electronic cigarette body head portion, the electronic cigarette middle insulation portion and the electronic cigarette holder portion are sensed through the detection pad, the capacitance detection module performs segmented collection and judgment based on the preset threshold ranges A, B and C, and the main control module outputs the control instruction according to the recognition result. The problems that in the prior art, manual starting experience is poor, the magnetic resistor contact type misjudgment rate is high, and the single threshold judgment accuracy of a traditional capacitor scheme is insufficient are solved.

The invention discloses a dendritic crystal in-situ quantitative detection system and detection method based on distributed micro-area capacitance detection in a battery, and aims to solve the problem that in the prior art, nondestructive, rapid, high-resolution and high-sensitivity in-situ detection of dendritic crystals in the battery is difficult to carry out. The detection method comprises the following steps: 1, compounding the capacitance detection film and the diaphragm to form a composite film, assembling the battery, and collecting the original capacitance value of each micro capacitor without dendritic crystals; 2, collecting the capacitance value of each micro capacitor on the capacitance detection film in the to-be-detected battery in the working process of the battery, calculating the capacitance change value, and obtaining the size of the dendritic crystal; and 3, adding the capacitance change values of all the micro capacitors to obtain the total lithium precipitation amount on the electrode plate and obtain dendritic crystal distribution information. The total dendritic crystal quantity and dendritic crystal growth and distribution information are obtained according to distributed micro-area capacitance signals, and the method has the characteristics of nondestructive in-situ detection, adjustable spatial resolution, high sensitivity and the like.

The invention belongs to the technical field of chemical equipment cleaning, and particularly relates to a polyester process floating valve tower cleaning process which comprises the following steps: S1, arranging a plurality of obliquely arranged double-nozzle groups on the bottom surface of each layer of floating valve tower tray, arranging a capacitance detection polar plate I on a floating valve cover, and arranging a capacitance detection polar plate II opposite to the capacitance detection polar plate I on the floating valve tower tray; s2, a capacitance value is obtained through detection, capacitance change rates Rreal of two adjacent times of detection are obtained through calculation, and when the number of times that the capacitance change rate Rreal of a certain floating valve is smaller than the average capacitance change rate # imgabs0 # of all floating valves at the same moment in a data acquisition period is larger than or equal to 800, the floating valve is judged to be a jamming floating valve; and S3, when the jamming proportion reaches 15%, flushing is triggered, and the double-nozzle set alternately sprays water vapor and ethylene glycol. The cleaning opportunity is judged according to the jamming proportion, double-medium pulse flushing is matched, automatic cleaning of the float valve tray is achieved, shutdown can be avoided, the cleaning cost is reduced, and the operation risk in the tower is eliminated.

The invention relates to an in-situ ferromagnetic wear particle detection sensor and a detection method, the in-situ ferromagnetic wear particle detection sensor comprises an LC oscillation circuit, an inductance digital converter and a microcontroller, the LC oscillation circuit comprises an induction coil and a first capacitor connected with the induction coil; the detection sensor further comprises a permanent magnet, the induction coil is arranged on one side of the permanent magnet, and when ferromagnetic particles enter the induction coil under the adsorption action of the permanent magnet, inductance change of the induction coil and equivalent parallel resistance change of the induction coil and the particles are caused. The inductance digital converter is used for receiving inductance data and equivalent parallel resistance data output by the LC oscillating circuit, converting the inductance data and the equivalent parallel resistance data into resonant frequency and proximity and outputting the resonant frequency and the proximity, and the microcontroller is used for receiving the resonant frequency and the proximity data, processing the resonant frequency and the proximity data and outputting the processed data outwards. The system has high detection sensitivity, can distinguish particle characteristics, feeds back a machine operation state in real time, and is convenient for operators to maintain the machine in time.

A full-bridge series resonant converter includes a full-bridge switch circuit, a transformer, a resonant tank, a sensing circuit, and a processing circuit. The full-bridge switch circuit includes a first switch leg and a second switch leg having a second lower switch. The resonant tank includes a resonant inductor, a magnetizing inductor, and a resonant capacitor. The sensing circuit is coupled between the resonant capacitor and a ground point of a primary side of the transformer for sensing a node voltage between the resonant capacitor and the ground point as a sensing voltage. The processing circuit counts a turned-on time of the second lower switch as a first half-cycle time based on the sensing voltage, and duplicates the first half-cycle time as a second half-cycle time for controlling the full-bridge switch circuit.