651 results about "Positive temperature" patented technology

The invention relates to the technical field of air conditioner energy-saving systems, and discloses a central air conditioner energy-saving automatic control system and method.The central air conditioner energy-saving automatic control system comprises a sensor module, a control module, a communication module, an intelligent control algorithm module, a dynamic adjusting module and an energy-saving optimization module; the sensor module comprises a temperature sensor, a humidity sensor, a CO2 sensor, an illumination sensor and an occupation sensor, the temperature sensor is used for monitoring indoor and outdoor temperatures and providing real-time data for decision making of a control system, and an NTC (negative temperature coefficient thermistor), a PTC (positive temperature coefficient thermistor) or a DS18B20 digital temperature sensor is adopted. The environment parameters are monitored in real time, the operation state of the air conditioning equipment is dynamically adjusted, the high-energy-consumption operation mode of a traditional air conditioning system is avoided, cooling / heating according to needs is achieved, energy consumption is effectively reduced, the mode is automatically switched to the energy-saving mode in the state that the number of personnel activities is small or no one exists, and therefore the effect of remarkably reducing the operation load and energy consumption can be achieved.

The invention discloses a band-gap reference circuit which comprises a band-gap reference core module used for superposing a positive temperature coefficient voltage and a negative temperature coefficient voltage to generate a band-gap reference voltage; and the reference output module is used for dividing the band-gap reference voltage to generate a reference voltage. Wherein the band-gap reference core module comprises a temperature excursion trimming unit, the temperature excursion trimming unit is used for trimming the temperature excursion of the band-gap reference voltage by adjusting the positive temperature coefficient voltage, and the reference output module further comprises a temperature excursion compensation unit used for adjusting the voltage division proportion of the reference output module. Therefore, the offset generated in the reference voltage in the temperature drift trimming process is eliminated. According to the band-gap reference circuit, it can be guaranteed that the reference voltage is not affected by the temperature condition, the consistency of the reference voltage can be guaranteed, and the application requirement is well met.

The invention relates to the technical field of integrated circuits, in particular to a band-gap reference voltage source, which comprises a high-order compensation circuit, a low-order compensation circuit, a low-order compensation circuit, a low-order compensation circuit and a low-order reference circuit, the band-gap reference circuit is used for generating a positive temperature coefficient voltage and a negative temperature coefficient voltage, performing first-order temperature compensation on the negative temperature coefficient voltage by using the positive temperature coefficient voltage, performing high-order curvature compensation on the negative temperature coefficient voltage based on the target compensation current, determining the compensated voltage as a reference voltage and outputting the reference voltage; according to the band-gap reference voltage source, high-order compensation is introduced through the sub-threshold MOS tube, the negative temperature coefficient voltage can be well reduced, the reference voltage with the temperature coefficient approximate to zero is obtained, and practicability is high.

The present invention belongs to the technical field of microwave dielectric ceramics, and discloses a reducing-resistant microwave dielectric ceramic temperature-frequency characteristic regulator. Among them, the application of a microwave dielectric ceramic material as a microwave dielectric ceramic temperature-frequency characteristic regulator, and the chemical formula of the microwave dielectric ceramic material satisfies (AO)3(BO)(XO2)2, where A = Ba x Sr y , B = Mn h Mg k , X = Si m Ti n ; x + y = 1, h + k = 1, m + n = 1, 0 ≤ x ≤ 1, 0.6 ≤ h ≤ 1, 0.8 ≤ m ≤ 1; and when h = 1 and m = 1, x ≠ 0; this microwave dielectric ceramic material can be adjusted by addition to regulate the overall temperature coefficient of resonance frequency of the ceramic system. By improving the composition of the material, the obtained microwave dielectric ceramic material has the characteristics of adjustable dielectric constant, low dielectric loss, and high positive temperature coefficient of resonance frequency, and can especially be used as a microwave dielectric ceramic temperature-frequency characteristic regulator with a strong regulation effect.

A bandgap reference circuit includes a first, a second and a third current source, a first and a second amplifier. The first, the second and the third current source each includes two cascode PMOS transistors for reducing the voltage stress applied to PMOS transistors when receives a high power supply voltage. The first amplifier controls the PMOS transistors in the first and the second current source to ensure that the PMOS transistors have enough headroom when receives a low power supply voltage. The second amplifier provides a gain-boosting loop to prevent the system mismatch of the PMOS transistors in the first, the second and the third current source. A temperature coefficient adjustment unit introduces positive temperature coefficients and negative temperature coefficients in the currents generated by the first and second current source, and a resistor generates the reference voltage according to a current duplicated by the third current source.

The invention provides a PTC (Positive Temperature Coefficient) resistor selecting and matching method for overvoltage suppression of an electromagnetic voltage transformer, which belongs to the technical field of electromagnetic voltage transformers and comprises the following steps of: firstly, recording electrical parameters of the transformer in normal and pressurization operation states and parameters of an overvoltage suppression resistor; based on the data, a mutual inductor operation equation set considering multiple factors is established, and operation parameters are obtained through fitting. And then, optimizing parameters of an overvoltage suppression resistor through a genetic algorithm by utilizing an overvoltage suppression effect evaluation model, and taking minimization of overvoltage voltage and duration as a target. And finally, according to an optimization result, selecting a proper model from the existing PTC resistor products as final configuration. According to the method disclosed by the invention, the electromagnetic theory, the thermodynamic principle, the optimization algorithm and the engineering practice are combined, so that the technical problems that most overvoltage protection schemes in the prior art adopt empirical design methods and lack systematic and quantitative optimization processes are solved.

The invention discloses a low-temperature drift reference circuit, which belongs to the technical field of electronic circuits and comprises a starting unit, a reference core unit and a base current absorption unit, the starting unit is connected with the reference core unit and the base current absorption unit, and the reference core unit is connected with the base current absorption unit. According to the low-temperature-drift reference circuit, the T-type resistor network is adopted, negative temperature coefficient voltage is compensated depending on a positive temperature coefficient voltage expansion item, and low-temperature-drift reference voltage can be obtained; the magnitude of the reference voltage can be adjusted by changing the proportional relation between the resistance type and the resistance value of the resistance network and the current mirror.

The utility model discloses an optical module, comprising an emission driving unit which comprises a level comparator and a thermistor compensation network, the level comparator receives an electric input signal and a reference electric signal, and the thermistor compensation network receives an output signal of the level comparator and comprises a first branch circuit and a second branch circuit which are connected in series, the first branch comprises a positive temperature coefficient thermistor and a fixed resistor which are connected in series and in parallel, and the second branch comprises a negative temperature coefficient thermistor and a fixed resistor which are connected in series and in parallel; the laser is driven by the emission driving unit to output an optical signal; a receiving optical component that receives an optical input signal; and the receiving driving unit receives the signal output by the receiving optical component and outputs an electric signal. The optical module can realize light source temperature characteristic compensation in a wide temperature area.

The invention relates to the technical field of power monitoring, in particular to a power online monitoring method, system and device for a PTC heater. According to the method, the environmental instability of the electrical parameters is determined according to the unstable condition of the current current and the historical current at the temperature approaching the Curie point; the heat dissipation condition change degree is obtained through the trend fluctuation of the temperature deviation in the time sequence; determining a temperature deviation time period through the deviation with the gear temperature, and evaluating the environmental heat dissipation disorder degree according to the difference condition between the temperature deviation time periods; the monitoring sensitivity is obtained through the electrical parameter environment stability, the heat dissipation condition change degree and the environment heat dissipation disorder degree, and the power monitoring range is adjusted for monitoring. By analyzing the influence of the heat dissipation environment on the PTC heater, the power quantification range is adjusted at different monitoring degrees, the monitoring accuracy in different environments is improved, and the monitoring result is more reliable.

An accelerometer includes a housing, a proof mass assembly encased in the housing, and one or more heating elements configured to heat the proof mass assembly in response to an electrical current. The one or more heating elements include a positive temperature coefficient of resistance (PTC) material. The PTC material exhibits a relatively high increase in resistance above a threshold temperature. For example, a ratio of the resistance of the PTC material above the threshold temperature to the resistance of the PTC material at room temperature (PTC ratio) is greater than five.

The invention discloses a low-temperature-drift band-gap reference source circuit. The low-temperature-drift band-gap reference source circuit comprises a starting circuit, a PTAT current generating circuit, a CTAT current generating circuit and an output circuit. The PTAT current generation circuit is used for generating positive temperature coefficient current, and adopts a power supply voltage isolation structure consisting of two PMOS (P-channel Metal Oxide Semiconductor) tubes and two NMOS (N-channel Metal Oxide Semiconductor) tubes to isolate the interference of power supply voltage; the CTAT current generating circuit is used for generating a negative temperature coefficient current and adopts a clamping structure consisting of two triodes, so that the CTAT current generating circuit is not influenced by a power supply voltage; and the output circuit is used for outputting low-temperature-drift reference current and / or voltage. An operational amplifier clamping structure is not used, the complex structure of an integrated operational amplifier is omitted, the circuit structure is simplified, the area and power consumption are reduced, the influence of offset voltage of the integrated operational amplifier can be avoided, and practicability is high. In addition, the reference circuit further comprises a temperature compensation circuit, temperature high-order compensation is carried out through a feedback network formed by two resistors, and the reference current and the reference voltage are more accurate.

The invention discloses a high-voltage fast recovery diode with a positive temperature characteristic and a manufacturing method of the high-voltage fast recovery diode. A central region of the device is a P-type doped active region which is used as an anode when the device works in the forward direction; p-type doped field limiting rings are arranged on the two sides of the active region and serve as voltage dividing rings of the device, and the field limiting rings and the active region are doped independently; an N-type doped cut-off ring is arranged on the outermost periphery of the device and provides an electric field cut-off effect; a metal field plate is arranged above each field limiting ring to improve the distribution of a peripheral electric field and improve the stability of the device; except for the position of the contact hole, CVD, silicon nitride and polyimide in the vertical direction of the device are used as passivation layers of the device to isolate the influence of external moisture, charges and the like, so that the reliability of the device is improved; metal is directly deposited above the active region to serve as an anode of the device; and a layer of metal is evaporated on the back of the device after being thinned to serve as a device cathode. A platinum diffusion and electron irradiation process is used as a minority carrier lifetime control technology to adjust the temperature characteristic of the device.

The utility model discloses a PTC heating device, an air supply device and air treatment equipment, and belongs to the technical field of electric appliances, in the PTC heating device, a plurality of heating units are arranged in a zigzag mode along a fold line track, so that the PTC heating device can be matched with an arc-shaped or curve-shaped air outlet duct, and the PTC heating device can be applied to the air supply device with the curve-shaped air outlet duct. Because each heating unit is arranged on one line segment of the fold line, the heating piece and the heat dissipation piece of each heating unit can roughly extend in the same direction, the curvature difference between the heating piece and the heat dissipation piece is reduced, the problem that a gap is generated between the heating piece and the heat dissipation piece is solved, the attaching degree of the heating piece and the heat dissipation piece is improved, and the service life of the heating piece and the heat dissipation piece is prolonged. The contact area of the heating piece and the heat dissipation piece is increased, and the heating uniformity is improved. Moreover, the plurality of heating units are mutually connected through the connecting assemblies, on one hand, the structural integrity of the heating device is guaranteed, and on the other hand, the overall heating uniformity of the heating device can be improved.

The utility model provides a band-gap reference circuit, a chip and electronic equipment, and belongs to the technical field of electronics. The band-gap reference circuit comprises a band-gap reference voltage generation module, a positive temperature coefficient current generation module, a negative temperature coefficient current generation module, a zero temperature coefficient current generation module and a current comparison module; the positive temperature coefficient current generation module is connected with the band-gap reference voltage generation module, the negative temperature coefficient current generation module is connected with the positive temperature coefficient current generation module, and the zero temperature coefficient current generation module is respectively connected with the positive temperature coefficient current generation module and the negative temperature coefficient current generation module; the first input end of the current comparison module is connected with the zero temperature coefficient current generation module, the second input end is connected with the positive temperature coefficient current generation module or the negative temperature coefficient current generation module, and the output end is connected with the band-gap reference voltage generation module. According to the invention, self-calibration of temperature compensation is carried out, and the problem of high temperature drift coefficient is reduced.

The invention provides a PTC characteristic material current limiting effect evaluation method, and belongs to the technical field of PTC characteristic materials, and the method comprises the following steps: preparing a plurality of groups of PTC material resistance samples according to an orthogonal test principle, carrying out a current limiting effect experiment on the PTC material resistance samples, recording related data, carrying out data preprocessing and characteristic equation establishment, carrying out data expansion by using a fitting equation, and carrying out current limiting effect evaluation on the PTC material resistance samples. And obtaining a training data set. And finally, a generative adversarial neural network is adopted to construct a PTC characteristic material current limiting effect evaluation model. The proportion of the PTC material to be evaluated is input, and a predicted current limiting effect evaluation curve (including current-voltage characteristics, temperature-time characteristics, resistivity-temperature characteristics and current limiting multiple-time characteristics) is output to comprehensively reflect the dynamic response characteristics of the PTC material. According to the method, the technical problem that the current limiting effect of the PTC characteristic material cannot be rapidly evaluated due to the fact that the current limiting effect of the PTC characteristic material often needs to be obtained through an experiment mode in an existing method is solved.

The invention belongs to the field of temperature sensors, and particularly discloses a CMOS temperature sensing front-end circuit with an adjustable output voltage range, which comprises a temperature sensing module, a bias module, an output module and a power supply module, and is characterized in that the power supply module is respectively connected with the temperature sensing module, the bias module and the output module, and the temperature sensing module is respectively connected with the bias module and the output module; the bias module is connected with the output module; the power module provides voltage for the temperature sensing module, the bias module and the output module, the temperature sensing module detects temperature and outputs current with a positive temperature coefficient and reference voltage irrelevant to the temperature, and the bias module converts the reference voltage into bias current needed by the output module. And the output module converts the current with the positive temperature coefficient into a controllable voltage with a negative temperature coefficient. According to the invention, the flexible control of the output voltage range is realized, and the precision of the temperature sensor is improved. The invention is suitable for the temperature sensor system.

The utility model discloses a PTC (Positive Temperature Coefficient) heating plate for vehicle thermal management, which relates to the technical field of vehicle heating equipment, and comprises a shell, ventilation holes are formed in two sides of the shell; a control box; the shell is detachably connected with the upper end of the shell; the heating plate bodies are arranged at the bottom of the control box at intervals; the heat-conducting fins are arranged at intervals in a stacked mode, the heating plate bodies vertically penetrate through the heat-conducting fins, and the heat-conducting fins can be vertically inserted into the shell; the two filtering assemblies can be transversely inserted into the shell. The rubber blocks can be inserted into the inserting grooves, so that impact force generated on the heating plate body in the running process of a vehicle is reduced, the heat conducting fins are arranged outside the whole heat conducting sleeve, heat can be conveniently and evenly transmitted to the heat conducting fins, the wavy heat conducting fins can increase the contact area with air, the heating effect is improved, and the service life of the heating plate is prolonged. And the filter screen can be cleaned and replaced by pulling out the fixing strip, so that the cleaning and replacing operation of the filter screen is simple.

A mouthpiece for a vaporizer device includes a vapor inlet and an aerosol outlet. A first plurality of air inlets and a second plurality of air inlets are disposed between the vapor inlet and the aerosol outlet and configured to provide air streams. The air streams form a first vortex and a second vortex. The air streams mix with a vapor entering from the vapor inlet and form an aerosol exiting through the aerosol outlet. Related apparatus, systems, techniques and articles are also described.

A transverse temperature gradient model of an asymmetric wing-plate-free steel box girder bridge is composed of a transverse positive temperature gradient model and a transverse negative temperature gradient model which are both in a three-fold-line form. Temperature measuring points are arranged according to the section characteristics of the wing-plate-free steel box girder and the distribution characteristics of a temperature field, long-term monitoring of the transverse temperature field of the wing-plate-free steel box girder bridge is carried out, and statistical analysis and least square fitting are carried out on the transverse daily extreme temperature difference. A transverse temperature gradient model suitable for the 100-year, 150-year and 200-year design service life of the asymmetric wing-plate-free steel box girder bridge is constructed, the influence of the design service life and the section height is considered in the model, and the transverse temperature gradient model can be used for solving the transverse temperature stress of the asymmetric wing-plate-free steel box girder bridge.

The invention discloses a temperature sensor, a temperature acquisition device and electronic equipment, in the temperature sensor, a temperature sensing current generation module responds to target temperature change, and provides a first current signal with a positive temperature coefficient for a current conversion module; the current conversion module converts the first current signal into a first voltage signal with a negative temperature coefficient and generates and outputs a second voltage signal to the voltage regulation module according to the first voltage signal, and the voltage value of the second voltage signal is an integral multiple of the voltage value of the first voltage signal; the voltage regulation module receives the second voltage signal and outputs a third voltage signal to the analog-to-digital converter, and the voltage value of the third voltage signal is smaller than that of the second voltage signal; the analog-to-digital converter receives the third voltage signal and outputs a target digital signal, and the target digital signal is used for representing the temperature measured by the temperature sensing front-end circuit. According to the arrangement, the accuracy of temperature detection can be improved, and the temperature sensor is high in accuracy, small in size and low in power consumption.

The utility model discloses a water and electricity separated PTC heater, which comprises a PTC heating core body, a liquid box and a heating base, a cavity is arranged in the liquid box, one end of the liquid box is provided with an opening communicated with the cavity, at least one first partition plate is arranged in the cavity so as to divide the cavity into at least two mutually independent liquid cavities, and the heating base is arranged in the cavity. PTC (Positive Temperature Coefficient) shells with the same number as the liquid cavities are arranged on the heating base, the PTC heating core bodies are respectively arranged in the PTC shells, the PTC shells are respectively arranged in the liquid cavities, a first sealing ring is arranged on the heating base, the heating base is arranged in the opening and is sealed through the first sealing ring, a liquid inlet is formed in the bottom of one liquid cavity, and a liquid outlet is formed in the bottom of the other liquid cavity. A liquid outlet is formed in the bottom of the other liquid cavity, and a notch allowing liquid to flow through is formed in the first partition plate. Compared with the prior art, water and electricity separation is achieved.

An over-current protection device includes a first metal layer, a second metal layer and a heat-sensitive layer laminated therebetween. The heat-sensitive layer exhibits a positive temperature coefficient (PTC) characteristic and includes a first polymer and a conductive filler. The first polymer consists of polyvinylidene difluoride (PVDF), and PVDF exists in different phases such as α-PVDF, β-PVDF and γ-PVDF. The total amount of α-PVDF, β-PVDF and γ-PVDF is calculated as 100%, and the amount of γ-PVDF accounts for 33% to 42%.

An acoustic wave filter includes a substrate and a piezoelectric layer over the substrate. First acoustic wave resonators are disposed over the piezoelectric layer and arranged in series along a first branch, and second acoustic wave resonators are disposed over the piezoelectric layer, arranged in parallel, and connected to the first branch and to ground. The first and second acoustic wave resonators include an interdigital transducer electrode interposed between a pair of reflectors. A layer of positive temperature coefficient of frequency dielectric material is disposed over one or more of the first plurality of acoustic wave resonators to control the temperature coefficient of frequency and improve temperature stability of the acoustic wave filter.

The invention aims to provide the system and the method for precisely measuring the heat conduction performance of the vapor chamber, which can eliminate errors caused by contact thermal resistance by utilizing the vapor chamber, and is high in spatial resolution and non-destructive in test. The uniform temperature plate heat conduction performance precision measurement system comprises a temperature measurement module, the temperature measurement module comprises a heating module and a plurality of measurement modules, each measurement module comprises a thermocouple probe and a force adjusting mechanism which are connected, and each thermocouple probe comprises a T-shaped thermocouple, a positive electrode temperature measurement pressure head and a negative electrode temperature measurement pressure head. The positive temperature measuring pressure head and the negative temperature measuring pressure head are mutually independent and are arranged in a floating mode relative to the force adjusting mechanism, the positive temperature measuring pressure head is provided with a copper thermocouple wire connected to the positive electrode of the T-type thermocouple, and the negative temperature measuring pressure head is provided with a constantan thermocouple wire connected to the negative electrode of the T-type thermocouple. The copper thermocouple wire and the constantan thermocouple wire are short-circuited and form a thermocouple loop when being in contact with the vapor chamber at the same time; the method is realized based on the measurement system. The method is applied to the technical field of vapor chamber testing.

The utility model relates to the technical field of PTC (Positive Temperature Coefficient) thermistor processing, and discloses a dust removal device for PTC thermistor processing spraying, which comprises a mounting seat, the front surface of the mounting seat is fixedly connected with a processing box, the left side of the processing box is fixedly connected with a drain pipe, and the inner side of the processing box is fixedly connected with a dust filtering plate. A first adsorption plate and a second adsorption plate are fixedly connected to the interior of the treatment box, the second adsorption plate is arranged on the right side of the first adsorption plate, an ash removal mechanism is arranged on the front face of a dust filtering plate, and a spraying mechanism is arranged between the first adsorption plate and the second adsorption plate. According to the dust removal device for PTC thermistor processing spraying, the dust removal mechanism is arranged, dust on the surface of the dust filtering plate is cleaned and collected in a centralized mode, manual cleaning is not needed, the dust removal effect is improved, meanwhile, the dust removal efficiency of the dust filtering plate is improved, the spraying mechanism is arranged, a spraying head sprays water mist to settle dust and solid particles, and the dust removal efficiency is improved. Therefore, the dust removal effect is further improved.

The invention belongs to the technical field of flexible sensors, and particularly relates to a temperature-pressure dual-mode decoupling flexible sensor based on a full resistance type response mechanism. The invention discloses a preparation method of a dual-mode decoupling flexible sensor capable of simultaneously detecting a temperature signal and a pressure signal, the sensor comprises a five-layer structure, the upper layer and the lower layer are PET packaging layers coated with silver electrodes, and the middle structure is formed by stacking a pressure sensor, a silver electrode and a temperature sensor in sequence from top to bottom. The temperature-sensitive material and the pressure-sensitive material in the dual-function sensor are both in a resistance response mechanism under stimulation, and signals are inevitably interfered. For the pressure sensor, the pressure sensor shows positive temperature coefficient response, and the response to the temperature is close to zero by adding a material with a negative temperature coefficient, so that the pressure sensor is insensitive to a temperature signal. For the temperature sensor, the pressure signal desensitization of the temperature sensor is realized through the preparation of an ultrathin temperature sensing film material and the design of a dual-function sensor stacking mode. By adjusting the sensor film to be sensitive to only one stimulus and negligible in response to the other stimulus, decoupling of temperature and pressure signals is achieved, the temperature and the pressure can be detected and distinguished at the same time, a resistance signal serves as a unique output signal, a complex signal processing and reading system is not needed, the preparation process is simple, and operability is high. And the manufactured sensor is high in sensitivity and is applied to the fields of wearable equipment, man-machine interaction, electronic skin, bionic robots and the like.

The invention relates to the technical field of analog integrated circuits, in particular to an index curvature compensation band-gap reference source circuit and system. Comprising a band-gap core sub-circuit, an index curvature compensation sub-circuit, a power interface and a voltage interface, wherein the band-gap core sub-circuit is used for generating positive temperature coefficient current; and the index curvature compensation sub-circuit is used for receiving the positive temperature coefficient current so as to generate a base current and further output an index curvature compensation voltage to the voltage interface. According to the band-gap reference source circuit with the exponential curvature compensation, the positive temperature coefficient current of the band-gap core sub-circuit is converted into the base current through the exponential curvature compensation sub-circuit, so that the influence of a first-order item temperature coefficient and a high-order item temperature coefficient in the positive temperature coefficient current is eliminated; the exponential curvature compensation voltage which is not influenced by temperature drift is output, and the precision and the stability of the output voltage are improved.

The invention provides a band-gap reference circuit and a chip, and the circuit comprises a voltage generation module which is used for generating a first voltage with a positive temperature coefficient and a second voltage with a negative temperature coefficient, and generating a reference voltage with a zero temperature coefficient according to the first voltage and the second voltage; and the load driving module is used for providing load driving capability for the voltage generation module so as to carry out driving buffering on a post-stage circuit. The whole circuit does not contain an operational amplifier clamp and can provide reference voltage with a zero temperature coefficient, so that the power consumption of the band-gap reference circuit is effectively reduced; meanwhile, the load driving module provides load driving capacity for the voltage generation module, so that the output reference voltage has the load driving capacity, and the problems that an existing band-gap reference circuit is high in power consumption and does not have the load driving capacity are solved.

The invention relates to the technical field of semiconductor device manufacturing, in particular to an FRD process control method with the characteristic that forward conduction voltage drop is positive temperature, and the method comprises the following steps: S1, ring base region process, S2, cut-off ring process, S3, Control process, S4, PT sputtering, S5, Pt kill, S6, metallization, S7, irradiation treatment, S8, back thinning, and S9, back gold process. In particular, through comprehensive application of the implantation dosage of boron ions, the diffusion condition of a platinum layer and electron irradiation, the method can ensure that the FRD has optimized performance that the forward conduction voltage drop is approximate to zero temperature or the positive temperature characteristic; and the forward conduction voltage drop can be kept in a relatively stable range and can also be improved along with the temperature rise, so that the current conduction capability and the thermal stability of the parallel device are improved.

The utility model relates to the technical field of new energy automobile air conditioner heating and electric heater test equipment of household appliances, and discloses PTC heater power test equipment, which comprises a placement table, a test assembly, an air supply assembly and a display assembly. The placement table is used for placing the PTC heater; the test assembly is arranged on the placement table, and the test assembly is connected with the PTC heater placed on the placement table; the air supply assembly communicates with the placement table and is used for providing airflow towards the placement table; the display assembly is connected with the test assembly. The test assembly is connected with the display assembly, after the PTC heater is connected with the power supply, the test assembly records the voltage, current, power and resistance changes of the PTC heater and displays the changes on a resistance meter of the display assembly, so that the test result does not need to be manually checked in real time, and the test efficiency is improved by adjusting the wind speed, the power and the current. And the performance of different products can be tested.