47 results about "Capacitance meter" patented technology

The invention belongs to the technical field of humidity sensors, and particularly relates to a wireless passive flexible sensor and a preparation method and application thereof. The flexible sensor comprises a flexible substrate, a planar spiral inductor, a sensitive capacitor and a humidity-sensitive film, wherein the planar spiral inductor and the sensitive capacitor are arranged on the surface of the flexible substrate; the humidity-sensitive film covers the surface of the sensitive capacitor; the planar spiral inductor and the sensitive capacitor are connected in series; the humidity-sensitive film is composed of a mono-substituted carboxyethyl viologen compound. According to the invention, the monosubstituted carboxyethyl viologen compound has good hydrophilicity and has the characteristic that the dielectric constant changes along with the content of adsorbed water molecules, and the monosubstituted carboxyethyl viologen compound is applied to the humidity-sensitive film, so that the sensitivity of a sensor for detecting humidity is improved; meanwhile, wireless transmission of signals is achieved in an electromagnetic coupling mode; the flexible wireless passive sensor provided by the invention can be easily placed in a narrow closed space and can precisely monitor the environment humidity.

The invention, which belongs to the technical field of the energy storage converter, discloses an electrical parameter sensing-based service life monitoring system for a capacitor of a network-forming type energy storage converter, comprising the following steps of: synchronously acquiring a direct-current voltage signal and a three-phase alternating-current signal of a direct-current bus capacitor through an electrical parameter acquisition module to form a multi-dimensional feature vector; a state observer built in the ESR estimation module is used for analyzing the signal, a target capacitor ESR value is obtained, and a capacitor core temperature value is obtained through back-stepping through an electric-thermal coupling field analysis model of a core temperature back-stepping module in combination with preset capacitor surface temperature data; based on the ESR value and the capacitor core temperature value, a life prediction module calculates the residual life and health degree index of the capacitor; and the power scheduling module executes capacitor health degree-power output joint scheduling according to the health degree index, adjusts the power fluctuation range of the converter, and feeds back real-time working condition data to the electrical parameter acquisition module, thereby realizing accurate monitoring of the capacitor state and intelligent scheduling of the converter power.

The invention discloses a multi-channel test circuit and method for MLCC capacitors. The circuit comprises a control unit MCU, a capacitor, a switching module, a plurality of clamping protection circuits and a plurality of tested MLCC capacitors. Wherein the input end of the switching module is electrically connected with a tested MLCC capacitor; the control unit is electrically connected with the control end of the switching module, and the control unit is also used for being electrically connected with an upper computer; the capacitance meter is electrically connected with the control unit and is also electrically connected with the output end of the switching module; one end of the clamping protection circuit is electrically connected with the input end of the switching module, and the other end of the clamping protection circuit is electrically connected with the capacitance meter. The capacitance meter can be protected from being burnt by residual high voltage of the capacitor, one or two capacitance meters can be tested in a multi-channel mode, the structure is simple, control is easy, the technology is simple, an electric circuit is simple and clear, testing operation is easy, interference between the capacitance meters is reduced, testing quality is improved, cost is reduced, and wide application is facilitated.

The present invention relates to electronic component measurement technology, and discloses a method and circuit for automatic measurement of voltage, resistance and capacitance; the method comprises an external signal input circuit, an internal switch network circuit, a reference signal output and current source generation circuit, a channel switching and ADC acquisition circuit and a comparator output circuit; the external signal input circuit is connected to the internal switch network circuit, the internal switch network circuit is connected to the channel switching and ADC acquisition circuit and the reference signal output and current source generation circuit, and the external signal input circuit comprises a resistor R5 and an input port A1, a resistor R6 and an input port A2, and a resistor R7 and an input port A4. The present invention simplifies the measurement circuit of a voltage, resistance and capacitance meter, and only three resistors are required to automatically measure voltage, resistance and capacitance, and there is no need to use relays and dials to switch gears, and the internal automatic range is determined for measurement; the design is safe and reliable, the volume is small, and the manufacturer's production cost is reduced and production efficiency is improved.

A hair analyzer includes a first electrode, configured to contact a first portion of a hair; a second electrode, configured to contact a second portion of the hair; a capacitance meter, configured to measure a capacitance between the first electrode and the second electrode; and a processor, configured to generate a hair assessment based on the capacitance.

The utility model belongs to the technical field of capacitor production, and particularly relates to a capacitor labeling machine capable of feeding synchronously, which comprises a main body, a feeding assembly arranged on one side of the main body and used for quickly vibrating and feeding capacitor materials; and the labeling assembly is arranged in the main body and is used for quickly labeling the surface of the capacitor. According to the labeling machine, materials can be guided to conduct double-track feeding machining through the feeding assembly capable of conducting synchronous feeding, the machining efficiency of the device can be effectively improved, meanwhile, batch materials can be rapidly clamped and transferred through the labeling assembly, the materials are rapidly guided to move and machine, and the machining efficiency is improved. And meanwhile, the materials are guided to be quickly labeled and cured through the laser nozzle and the light curing lamp source, so that the labeling efficiency of the capacitor is improved.

The utility model discloses a wrapping machine for capacitor processing. The wrapping machine comprises a supporting machine body; the utility model has the beneficial effects that: through the arrangement of the second air cylinder, the limiting guide seat, the third air cylinder and the laminating pressing plate, the output end of the second air cylinder drives the limiting guide seat to adjust the height position, so that the limiting guide seat can be conveniently positioned, and the laminating pressing plate can be conveniently positioned; the output end of a third air cylinder drives an attaching pressing plate to move, a film on the surface of a capacitor is further stabilized through the attaching pressing plate, the wrapping stability is improved, a first air cylinder, an adjusting sliding plate and an ejection plate are arranged, and the output end of the first air cylinder drives the adjusting sliding plate and the ejection plate to move upwards; the film material fed from the lower film outlet is ejected out, the film material is folded, then the folded film material is ejected to one side of the capacitor through the film ejecting plate, and the capacitor is completely wrapped.

A condition monitoring system is provided for a journal bearing arranged to support a rotary component installed in a rotary machine, which condition monitoring system includes a pair of electrical terminals arranged on either side of an oil-filled gap between the journal and the rotary component; a capacitance meter connected across the terminals and configured to output a measurement reading indicative of capacitance across the terminals during operation of the rotary machine; and an evaluation unit to receive readings from the capacitance meter and to determine the health of the journal bearing on the basis of the measurement readings. A method of determining the health of a journal bearing based on capacitance measurement readings across the oil-filled gap between a bearing journal and the supported rotary component is also provided.

The present invention is applicable to the technical field of capacitor processing, and provides an impregnation machine for capacitor processing, comprising: a chassis, an impregnation box and a carrying plate arranged in the chassis; at least one group of carrying components for placing capacitors, the carrying components comprising a carrying plate and a plurality of carrying plates; a multifunctional pressing mechanism, the multifunctional pressing mechanism being located above a drain box; and a driving mechanism, the driving mechanism being arranged in the drain box, and a two-way lifting component is also arranged on the chassis; the present invention avoids the problem that the traditional impregnation machine does not thoroughly treat the impregnation liquid remaining on the surface of the capacitor after the impregnation is completed, which is easy to cause pollution or affect the performance of the capacitor during subsequent processing or use, through the coordinated arrangement of the carrying component, the multifunctional pressing mechanism, the driving mechanism and the two-way lifting component.

The present invention discloses a multi-channel test circuit and method for MLCC capacitors, the circuit includes: a control unit MCU, a capacitor, a switching module, a plurality of clamping protection circuits and a plurality of MLCC capacitors to be tested; wherein the input end of the switching module is electrically connected to the MLCC capacitor to be tested; the control unit is electrically connected to the control end of the switching module, and the control unit is also used to be electrically connected to a host computer; the capacitance meter is electrically connected to the control unit, and the capacitance meter is also electrically connected to the output end of the switching module; one end of the clamping protection circuit is electrically connected to the input end of the switching module, and the other end is electrically connected to the capacitance meter. The capacitance meter can be protected from being burned by the residual high voltage of the capacitor, and one or two capacitance meters can be used for corresponding multi-channel testing, with a simple structure, simple control, simple process, simple and clear electrical circuits, simple test operation, and reduced interference between capacitance meters, thereby improving test quality, reducing costs, and facilitating wide application.

The invention relates to the technical field of stress measurement, and discloses a stress measurement device based on piezoelectric ceramics, which comprises a bearing frame and a base, the bearing frame is perpendicular to the upper surface of the base, the bearing frame is provided with a groove, a positioning groove and a first sliding groove, the groove is provided with an adjusting device, and a sliding rod is fixedly connected with the adjusting device. The sliding rod slides in the first sliding groove, the adjusting device slides in the groove, the adjusting device comprises an adjusting unit, the adjusting device is provided with a second sliding groove, the adjusting unit slides in the second sliding groove, the adjusting unit comprises a telescopic rod, a gradienter, a capacitance meter and an adjusting column, the groove is fixedly connected with a platform, and piezoelectric ceramics are placed on the platform. The platform is fixedly connected with a displacement sensor, the bottom of the platform is fixedly connected with one end of a force sensor, and the end, away from the platform, of the force sensor is fixedly connected with a groove. The device and the method have the characteristics of accurately acquiring various data and accurately measuring stress.

The embodiment of the invention provides an insulated gate bipolar transistor capacitance detection circuit and method. The circuit comprises a controller, an insulated gate bipolar transistor, a capacitance meter, a first capacitor and a second capacitor, one end of the first capacitor is connected with the grid electrode of the insulated gate bipolar transistor, and the other end of the first capacitor is connected with one end of the capacitance meter; the other end of the capacitance meter is connected with an emitting electrode of the insulated gate bipolar transistor; one end of the second capacitor is connected with the emitter of the insulated gate bipolar transistor, and the other end of the second capacitor is connected with the collector of the insulated gate bipolar transistor; the controller is used for acquiring the capacitance value of the first capacitor and the capacitance value detected by the capacitance meter, and determining the capacitance value of the input capacitor of the insulated gate bipolar transistor according to the capacitance value of the first capacitor and the capacitance value detected by the capacitance meter, so that the capacitance value of the input capacitor can be accurately detected; and an accurate design direction is provided for dynamic parameter testing of the switching speed and the switching loss of the insulated gate bipolar transistor.

A system and method for determining a piezoelectric property of a piezoelectric material are disclosed. The system includes a voltage source configured to apply a first voltage across the piezoelectric material during a first time period. A mass sensor is operatively coupled to the material to measure an apparent mass thereof, and a capacitance meter is configured to measure a capacitance of the material during the same time period. A processor, communicatively coupled to the mass sensor and the capacitance meter, is configured to calculate a first value indicative of a piezoelectric property, such as a piezoelectric coefficient (d33 or d31), based at least in part on the measured apparent mass and the measured capacitance. By utilizing these concurrent measurements, the system can determine an effective thickness of the material under an applied electric field, circumventing prior art assumptions and enabling a more direct and physically accurate characterization.

The utility model discloses a covering and pressing device for a surface protection layer of a capacitor. The covering and pressing device comprises a horizontally-arranged base and a baffle arranged above the base. A hydraulic rod is fixed to the inner wall of the baffle, the output end of the hydraulic rod is connected with a first fixing disc, and a first limiting block is arranged on the lower surface of the first fixing disc; a driving motor is fixed to the base, the output end of the driving motor is connected with a first rotating shaft, and a first connecting gear is mounted on the outer wall of the first rotating shaft; a second rotating shaft is arranged on the left side of the first rotating shaft. According to the capacitor surface protection layer covering and pressing device, the fixed gear and the second limiting block are connected in a bonding mode, the racks are distributed at equal angles and are in an arc shape, and the central angle corresponding to the racks is 60 degrees, so that connection between the fixed gear and the second limiting block can be firmer, and the service life of the capacitor surface protection layer is prolonged. And moreover, the fixed gear can rotate through the racks which are distributed at equal angles, so that the normal operation of capacitor film coating work is ensured.

This invention provides a method and apparatus for determining the collector-emitter voltage during the IGBT turn-off delay process. The method includes: determining the gate current expression based on a pre-established IGBT parasitic capacitance model using the gate-emitter capacitance current, gate-collector capacitance current, and gate-collector capacitance voltage; determining the gate-collector capacitance expression using the gate-collector capacitance voltage; obtaining the relationship between the collector-emitter voltage and the gate voltage and gate-collector capacitance voltage based on the gate current expression and the gate-collector capacitance expression; and solving the relationship to determine the expression for the change of the collector-emitter voltage over time. This invention, by determining the expression for the change of the collector-emitter voltage over time, enables the estimation of the collector-emitter voltage by observing the gate voltage and gate current of the IGBT device, achieving accurate and efficient monitoring of the collector-emitter voltage during the IGBT turn-off delay process, and providing a basis for IGBT turn-off process monitoring and analysis.

A motor driver monitoring method based on transient signals relates to the technical field of crane control, and comprises the following steps: establishing a common node inductance-capacitance equivalent transient model; according to the state of a switching tube on the inverter side and a system signal, a direct-current bus capacitive current is reconstructed, and average filtering is carried out on the voltage and the current to reduce interference; a long-period transient signal during load switching is analyzed, an equivalent series capacitor expression is deduced, a final ESC result is obtained through multiple times of monitoring and averaging, and a polynomial baseline calibration method is used for adjusting and reconstructing a capacitance current baseline; calculating transient process time based on the transient model, determining monitoring starting duration, and setting starting time by using a slope monitoring method; when load switching occurs, the aging monitoring program is started, and a capacitor aging result is output; the method is economical and efficient, computing resources can be saved, and a powerful guarantee is provided for reliability and safety of a crane driving system.

The invention relates to a fluoroplastic foaming extrusion production system and a use method thereof, and belongs to the technical field of wire and cable manufacturing equipment. Comprising a movable disc pay-off machine, a front traction machine, a front-section double-shaft diameter measuring instrument, an oven preheater, a vacuum filling machine, an integrated foaming extrusion unit, a vacuumizing device, a rear-section double-shaft diameter measuring instrument, a movable warm water tank, a fixed warm water tank, an in-water capacitance meter, a first spraying water tank, a water blower, a four-shaft eccentric meter, a rear traction machine and a spark machine which are sequentially arranged in the direction of a production line. The system comprises an integrated foaming extrusion unit, a three-axis concave-convex instrument, a data display processing device, an analysis and prediction module, a control module, a second spraying water tank and a movable disc take-up machine, and the integrated foaming extrusion unit comprises a main machine extruder, a first inclined auxiliary machine extruder, a second inclined auxiliary machine extruder and a foaming machine head. According to the invention, high-precision stable production in the whole process can be realized, an extremely stable material flow foundation is provided for a production line, and the consistency of the size and the performance of a product is fundamentally guaranteed.

The present invention relates to a method for quantitatively evaluating the moisture content of oil-paper insulation based on the Dissado-Hill model. A broadband equivalent circuit model of oil-paper insulation is constructed, and the complex capacitance expression of the model is deduced. Multiple groups of oil-paper insulation specimens with different moisture contents are prepared, and the complex capacitance test data of the specimens are measured by the frequency-domain dielectric spectroscopy method. An improved grey wolf algorithm is proposed based on the basic grey wolf algorithm and is used to solve the model parameter identification problem. According to the parameter identification results, characteristic parameters that can effectively characterize the moisture content of oil-paper insulation are extracted and a quantitative evaluation formula for the moisture content is constructed. Four groups of oil-paper insulation specimens with different moisture contents are prepared as specimens to be evaluated, and the corresponding complex capacitance test data are collected. The corresponding model parameter values are obtained through parameter identification, and are substituted into the quantitative evaluation formula for the moisture content to obtain the predicted value of the moisture content of the specimens to be evaluated; the relative error is selected as an index to measure the evaluation accuracy, and further the effectiveness of the moisture content quantitative evaluation method is verified.

The capacitor marking device comprises a rack and further comprises a conveying line arranged on the rack in the X-axis direction, a dust removal mechanism and a turnover mechanism which are arranged on the rack and located at the two ends of the conveying line respectively, and a marking mechanism arranged on the rack and located between the dust removal mechanism and the turnover mechanism. The dust removal mechanism is used for removing dust on the surfaces of the capacitors, the marking mechanism is used for marking the upper surfaces of the capacitors, and the overturning mechanism is used for overturning the marked capacitors. The device has the advantages that the dust removal mechanism, the marking mechanism and the turnover mechanism are sequentially arranged along the conveying line, full-process automatic operation of surface dust removal, upper surface marking and automatic turnover of the capacitor is achieved, the influence of dust on the marking quality is effectively avoided, manual intervention is reduced, and the production efficiency and the product yield are remarkably improved. And meanwhile, the capacitor can be overturned by the overturning mechanism, so that double-sided processing of the capacitor is facilitated.

The invention relates to a MEMS element (1) for the mechanical-electrical conversion of frequent changes, such as pressure changes, sound waves, structure-borne sound waves, and / or ultrasound waves, into electrical signals, comprising: at least two oppositely differentially measuring capacitors, each consisting of at least one fixed electrode (17, 18, 19, 20) and at least one movable electrode (8, 9, 10, 11, 13, 14, 15, 16), wherein the movable electrode (8, 9, 10, 11, 13, 14, 15, 16) is coupled to a membrane arrangement (5) consisting of at least two membranes (3, 4) with a defined distance between each other, wherein the conversion into electrical signals is carried out by a differential measurement of at least two capacitance changes resulting from a mechanical change of an area overlap size (21-28) between the fixed electrode (17, 18, 19, 20) and the movable electrode (8, 9, 10, 11, 13, 14, 15, 16), which is defined by a lateral capacitive area between the fixed electrode (17, 18, 19, 20) and the movable electrode (8, 9, 10, 11, 13, 14, 15, 16).

The present invention provides a coil component capable of increasing the self-resonant frequency in a wide frequency band and a circuit substrate having the same. The coil component (1) comprises: a drum core (10) having flanges (11, 12) and a winding core (13); a winding (W) wound on the winding core (13); a conductive plate (21) overlapping the winding (W) via a dielectric plate (31); a terminal electrode (E1) disposed on the flange (11) and connected to one end of the winding (W); a terminal electrode (E2) disposed on the flange (12) and connected to the other end of the winding (W); and a terminal electrode (E3) disposed on the flange (11) and connected to the conductive plate (21). With this structure, a capacitance component is added between the winding (W) and the conductive plate (21), so that the capacitance component (inter-wire capacitance) between turns of the winding (W) is apparently reduced. As a result, the self-resonant frequency can be increased in a wide frequency band.

The present application belongs to the technical field of humidity sensor, and particularly relates to a wireless passive flexible sensor and a preparation method and application thereof. The flexible sensor provided by the present application comprises a flexible substrate, a planar spiral inductor and a sensitive capacitor arranged on the surface of the flexible substrate, and a humidity-sensitive film covering the surface of the sensitive capacitor; the planar spiral inductor and the sensitive capacitor are connected in series; and the humidity-sensitive film is composed of a single-substituted carboxyethyl viologen compound. In the present application, the single-substituted carboxyethyl viologen compound has good hydrophilicity and has the characteristic that the dielectric constant changes with the content of adsorbed water molecules, and the present application uses the same in the humidity-sensitive film to improve the sensitivity of the sensor in detecting humidity. Meanwhile, the present application realizes wireless transmission of signals through electromagnetic coupling. The flexible wireless passive sensor provided by the present application can be easily placed in a small and closed space and can precisely monitor the environmental humidity.

The present invention relates to the field of air compressors, and in particular to an air compressor with improved waterproof level. The air compressor with improved waterproof level includes a driving motor, a motor bracket, a crankcase, a capacitor, a capacitor baffle and an air guide cover; the two ends of the driving motor housing are respectively connected to the inner side of the crankcase and the inner side of the motor bracket, and the output end of the driving motor is connected to a cooling fan; the bottom surface screw of the capacitor passes through the corresponding hole position of the capacitor baffle and is connected to the protrusion of the crankcase body, and the capacitor baffle is clamped and fixed by the bottom surface of the capacitor and the protrusion surface of the crankcase body; the air guide cover covers the outside of all parts; the air compressor prevents rainwater from penetrating into the crankcase along the edge of the crankcase body by setting a waterproof step; and prevents rainwater sucked into the air compressor from dripping onto the surface of the capacitor by setting a shielding upper cover and a shielding rear cover, thereby improving the waterproof performance of the air compressor.

The invention relates to a condition monitoring system. The present invention describes a condition monitoring system for a journal bearing arranged to support a rotating component mounted in a rotating machine, the condition monitoring system comprising: a pair of electrical terminals respectively arranged on both sides of an oil-filled gap between the journal and the rotating component; a capacitance meter connected between the terminals and adapted to output a measurement reading indicative of a capacitance between the terminals during operation of the rotating machine; and an evaluation unit adapted to receive readings from the capacitance meter and determine a health of the journal bearing based on the measured readings. A method of determining the health of a journal bearing based on capacitance measurement readings across an oil charge gap between a bearing journal and a supported rotating component is also described.

The invention discloses a dispensing device for automobile capacitor production, and relates to the technical field of microfluid control, the dispensing device for automobile capacitor production comprises a base, a sliding device is arranged at the top of the base, and an adjusting outer frame for adjusting the dispensing height and a sliding bottom plate are arranged on the surface of one side of the sliding device; a dispensing pipe and a discharging pipe which are used for conducting dispensing on the surface of a capacitor are arranged in the adjusting outer frame, and a movable clamping block which is used for pinching off glue below a needle head of the dispensing pipe is arranged below the sliding bottom plate and attached to the main body clamping block through two stainless steel clamping blocks located at the bottom end of the needle head of the dispensing pipe. According to the glue dispensing device, the glue outlet of the glue dispensing pipe is sealed, the glue outlet is rapidly and mechanically cut off and sealed, it is ensured that the glue is cut off immediately after glue dispensing is stopped, the glue is prevented from being left in the glue strip rising process for wire drawing, and the glue dispensing consistency and accuracy are improved.

Since a steering wheel unit inevitably has an area where a sensor cannot be placed due to construction and design limitations of a steering wheel unit, a steering wheel unit is provided that is capable of determining where there is contact of an operator's hand even in a dead zone where no sensor is present. In the steering wheel unit, when any of the electrostatic capacitances measured by the capacitance meter while a self-capacitance detection mode is set by the mode switch is equal to or greater than a first threshold, it is determined that the operator's hand is in contact with the rim at a position overlapping at least one of the electrodes. When the electrostatic capacitance is equal to or greater than a second threshold, which is smaller than a first threshold, and smaller than the first threshold, the self-capacitance detection mode is switched to the mutual capacitance detection mode. After switching, when the electrostatic capacitance newly measured in the mutual capacitance detection mode is equal to or greater than a third threshold, it is determined that the operator's hand is in contact with the rim at a position overlapping a gap between the electrodes.

The capacitor overturning feeding mechanism comprises a feeding assembly used for flattening and conveying capacitors, a jacking assembly used for jacking the capacitors in a staggered mode is arranged on one side of the feeding assembly, and a pushing assembly used for pushing the capacitors which are jacked in the staggered mode is arranged above the jacking assembly. One side of the pushing assembly is provided with an overturning assembly for receiving the capacitor and overturning the capacitor, a positioning jig for fixing the capacitor is arranged below the overturning assembly, and one side, opposite to the jacking assembly, of the overturning assembly is provided with a pushing and installing assembly for installing and fixing the capacitor on the positioning jig. According to the utility model, automatic feeding can be carried out before the capacitors are sleeved with the sleeves, and the whole feeding and conveying process of the capacitors does not need to be clamped by a manipulator, so that the phenomenon that the surfaces of the capacitors are damaged by clamping is avoided, and the yield of the capacitors can be greatly improved; the capacitor feeding machine effectively solves the problem that a capacitor feeding machine in the market adopts a manipulator to clamp a capacitor, so that the surface of the capacitor is easy to damage, and the yield of the capacitor is low.

The utility model relates to the technical field of AC filter tower insulating covers, and discloses an AC filter tower full-covering insulating cover, which comprises a capacitor insulating cover, extension covers and a ventilation window, the extension covers are fixedly connected to two ends of the capacitor insulating cover and are of an integrated structure, and the bottom of the outer end of each extension cover is provided with a clamping groove; the ventilation windows are of a square structure and distributed at the upper ends of the capacitor insulation cover and the extension cover, the ventilation windows are located above the capacitor insulation cover and are of a staggered distribution structure, supporting feet are fixedly arranged at the corners of the upper ends of the ventilation windows, and baffles are fixedly arranged at the upper ends of the supporting feet and used for hiding the ventilation windows. And a large bird claw is prevented from scratching a capacitor surface insulating layer. According to the utility model, through the integrated structure of the capacitor insulation cover and the extension cover, the fault risk caused by connection loosening or damage is reduced, the stability of the whole structure is enhanced, the staggered distribution of the ventilation windows ensures good air circulation, and the potential damage of claws of large birds to the insulation layer on the surface of the capacitor is prevented.

The present invention relates to the technical field of temperature and humidity detection, and discloses a wireless passive dual-parameter sensor, comprising a spiral inductor, a forked capacitor, a substrate, a through hole, a moisture-sensitive material, and a temperature-sensitive material. The forked capacitor is composed of a first forked capacitor and a second forked capacitor. The first forked capacitor and the second forked capacitor are respectively connected in series with different turns of the same inductor through a through hole arranged on the substrate, so as to form a first resonant circuit and a second LC resonant circuit as a first resonant circuit and a second LC resonant circuit respectively. The temperature-sensitive material and the moisture-sensitive material are respectively coated on the surface of the first forked capacitor and the second forked capacitor in the forked capacitor. When the external environment temperature or humidity changes, the temperature-sensitive material or the moisture-sensitive material causes the dielectric constant to change due to the temperature or humidity change, causing the resonant frequency of the corresponding part to change, and the wireless passive detection of temperature and humidity is realized through the functional relationship between the resonant frequency and the temperature and humidity.

A Successive Approximation Analog-to-Digital Converter (SAR_ADC) and method of operating the same are provided. Generally, the SAR_ADC includes a comparator having a first input to receive an input voltage (VIN), and a second input coupled to a n-bit capacitive digital-to-analog converter (DAC) to receive a voltage (VDAC), a Successive Approximation Register (SAR) coupled to a comparator output to provide n digital control signals to the DAC, and to store and output an n-bit binary-number approximating VIN, and a reference buffer to provide a voltage (VREF) to the DAC. The DAC sequentially drives each capacitance beginning with a most significant bit towards VREF, while the comparator compares the resulting VDAC to VIN, and the SAR sets or clears a current bit represented by the capacitance driven. The reference buffer includes adaptive power tuning to dynamically tune a drive-strength of the reference buffer based on the current bit.