27 results about "Heat current" patented technology

The application discloses an overload automatic switch strategy making method for a dedicated transformer terminal and relates to the technical field of automatic control of dedicated transformers. The overload automatic switch strategy making method adopts an overload judgment rule containing a judgment branch one and a judgment branch two. The judgment branch one identifies a conventional electrical overload based on an overload current multiple and an equivalent thermal current. The judgment branch two identifies an implicit temperature overload based on real-time temperature. The overload grade from a pre-warning grade to a short-circuit grade is determined in combination with a reverse time limit time, and a corresponding switch control strategy is matched. The method effectively avoids the defects that a single current judgment cannot reflect thermal inertia, distinguish false disturbances and cover implicit overloads. Through multi-dimensional coupling verification and hierarchical disposal, the method not only filters false actions caused by short-time impacts, but also accurately captures thermal accumulation overloads and temperature overloads, thereby guaranteeing power supply continuity while avoiding damage to equipment caused by overloads.

A control device includes: a print data acquisition unit configured to acquire print data, which is formed of a plurality of lines and indicates a coloration state of each pixel included in the plurality of lines; a head drive unit configured to supply, to a thermal head formed of a plurality of heating elements each corresponding to the pixel, an electric current for heating the thermal head for each pixel; a motor drive unit configured to supply, to a motor configured to move heat-sensitive paper relative to the thermal head, a drive current for step driving the motor for each line; a speed control unit configured to control, based on the number of colored pixels of a determination subject line among yet-to-be-printed lines of the print data, a relative moving speed of the heat-sensitive paper moved by the motor; and a preheating control unit configured to cause the head drive unit to output, when the determination subject line is a specific line being a line in which the number of colored pixels of the determination subject line exceeds a predetermined value, a preheating current being an electric current for heating the thermal head to such a degree as to prevent coloring of the heat-sensitive paper by a time the specific line is printed.

The invention relates to a method for operating a fuel cell system (100), in particular a vehicle (200), by means of a control unit (FCCU) comprising: - Providing (110), by the control unit (FCCU), a respective heating current (I i,k ) to a heater of a number (n) of heaters of the fuel cell system (100) in a second calculation step (k), wherein the heating currents (I i,k ) in total a total heating current (I ges,k ) result, - Forecast (120), by the control unit (FCCU), of the total heating current (I ges,k+1 ) for a third calculation step (k+1) following the second calculation step (k) depending on the total heating current (I ges,k ) of the second calculation step (k) and - Operation (130), by the control unit (FCCU), of the fuel cell system (100) depending on the total heating current (I ges,k+1 ) of the third calculation step (k+1). The invention further relates to a fuel cell system (100), a computer program product, a computer-readable data carrier, a control unit (FCCU) and a system (200).

The invention discloses a micro-positive pressure anti-explosion flow transmitter and a flow detection method, and relates to the technical field of anti-explosion flow transmitters. The transmitter consists of an upper part, a middle part and a lower part, wherein the lower part comprises a three-way base, a thermal mass flow chip (sealed by ceramic and encapsulated by epoxy resin) and a shell joint cover; the middle part comprises a PCB (integrated operational amplification and signal conversion circuit) in an explosion-proof cavity and a shell cylinder; and the upper part comprises a cable and a brass nickel-plated explosion-proof stuffing box. According to the detection method, based on the thermal mass flow chip, the constant temperature difference principle and the Min's law (P / deltaT = K1 + K2f (qm) K3), the micro-positive pressure (50-500 Pa) gas flow is calculated by detecting the temperature difference and heating current change when gas flows through the chip, a 4-20 mA signal is output to the positive pressure controller, and flow monitoring, gas replacement judgment and fault alarm are achieved. The problem that an existing transmitter cannot detect micro-positive pressure gas is solved, the explosion-proof performance is excellent, and the transmitter can directly work in a dangerous area.

The invention discloses a printed circuit board low-temperature heating power supply assembly which comprises a printed circuit board and circuit elements arranged on the printed circuit board, the printed circuit board comprises a surface metal wiring layer and at least one inner metal wiring layer, the surface metal wiring layer is arranged on the front face and / or the back face of the printed circuit board, and the inner metal wiring layer is arranged on the front face and / or the back face of the printed circuit board. The inner metal wiring layer is arranged in the middle of the thickness direction of the printed circuit board, and the inner metal wiring layer and the surface metal wiring layer are arranged at intervals through the insulating base material; the circuit element comprises a heating element, a switch element and a temperature control electronic assembly; the heating element, the surface metal wiring layer and the inner metal wiring layer form a heating current loop; the switch element is connected in series with the heating current loop and is used for controlling the on-off of the heating element; the temperature control electronic assembly forms a temperature control circuit, is electrically connected with the switch element and is used for detecting the temperature and controlling the switch-on and switch-off of the switch element, and the printed circuit board low-temperature heating power supply assembly can meet the requirement for stable starting of electronic equipment in an extremely low-temperature scene.

The invention discloses a motor driving method and device. The method comprises the following steps: acquiring a target output torque reference value, a target stator flux linkage reference value, a maximum allowable current value and a heat production current reference amplitude of a motor; in a preset first corresponding relation, obtaining a target heat production current range value corresponding to the target output torque reference value and the target stator flux linkage reference value; a target heat production current value is determined according to the size relation among the maximum allowable current value, the heat production current reference amplitude and the target heat production current range value; in a preset second corresponding relation, motor driving current values corresponding to the target output torque reference value, the target stator flux linkage reference value and the target heat production current value are obtained; a drive current having a motor drive current value is generated, and a motor is driven by the drive current. According to the embodiment of the invention, the heat production amount of the system can be actively adjusted to be dynamically matched with the heat demand of the whole vehicle, so that the problem that the heat production amount of the motor is uncontrollable in related technologies can be solved.

The invention relates to a method for operating a fuel cell system (100), in particular of a vehicle (200), by a control unit (FCCU), comprising: providing (110), by means of the control unit (FCCU), a respective heating current ( / i,k) to a heater of a number (n) of heaters of the fuel cell system (100) in a second calculation step (k), wherein the heating currents ( / i k) in total result in an overall heating current (I ges,k); predicting (120), by means of the control unit (FCCU), the overall heating current (I ges,k+i) for a third calculation step (k+1), following the second calculation step (k), in dependence on the overall heating current (I ges,k) of the second calculation step (k); and operating (130), by the control unit (FCCU), the fuel cell system (100) in dependence on the overall heating current (I ges,k+1) of the third calculation step (k+1). The invention also relates to a fuel cell system (100), to a computer program product, to a computer-readable data carrier, to a control unit (FCCU) and to a system (200).

The invention discloses a bipolar zigzag directional solidification casting heating device and a use method, the bipolar zigzag directional solidification casting heating device comprises: a heat insulation assembly defining a heat preservation cavity; the heating assembly is arranged in the heat preservation cavity and used for conducting radiation heating on the in-line casting module stretching into the heat preservation cavity; the heating assembly is divided into an upper heating group and a lower heating group along the height direction, and each heating group comprises a left electrode heating assembly and a right electrode heating assembly which are oppositely arranged and electrically isolated from each other, so that four closed electric heating loops which are electrically isolated from each other are formed; heating plates in the left side electrode heating assembly and the right side electrode heating assembly are staggered in a zigzag shape, so that the contours of the heating plates on the left side and the right side are opposite and form a plurality of rhombic heating spaces for accommodating single castings; the temperature control assembly is provided with temperature measuring points corresponding to the four closed electric heating loops respectively and used for collecting temperature feedback signals of the loops and conducting independent closed-loop adjustment on heating currents of the loops; and the conductive assembly is electrically connected with the heating assembly and is used for accessing an external power supply. The invention aims to enable the heating structure to realize uniform heating in multiple direction dimensions, realize relatively symmetrical intense radiation heat exchange in all directions, improve the uniformity of a temperature field, and reduce the risk of occurrence of defects such as mixed crystals and freckles.

The invention discloses a conductive method and structure for a gold and copper imitating furnace body of a hardware decoration coating machine, and belongs to the technical field of coating equipment. The method comprises the steps of obtaining furnace body parameters, calculating an insulation guide rail installation angle, constructing an electric field-temperature field-film thickness coupling model, calculating theoretical current and preheating current, evaluating electric field uniformity, monitoring branch health degree and conducting self-adaptive compensation. And the positions of the insulation blocks are controlled in stages to realize dynamic conductive control of centralized preheating, uniform coating and material taking open circuit. According to the invention, the current distribution uniformity, the film thickness consistency and the energy efficiency utilization rate can be effectively improved, and the equipment energy consumption and the operation complexity are reduced.

A method for manufacturing a spot welded joint disclosed herein includes a step of formally energizing a plate assembly comprising one or more steel components with a tensile strength of 980 MPa or higher, and a step of subsequently energizing the plate assembly. In this method, formal energizing is controlled by means other than adaptive control. Based on a pre-calculated cumulative heat generation per unit volume that allows for proper subsequent energizing of the plate assembly, the instantaneous heat generation per unit volume and per unit time is calculated based on the energizing time of the subsequent energizing. The subsequent energizing is adjusted using the inter-electrode resistance or inter-electrode voltage, or the subsequent thermal current that generates the calculated instantaneous heat generation per unit volume and per unit time, thereby performing adaptive control.

The application belongs to the field of infrared detector manufacturing, and specifically discloses a kind of ceramic package pulse current activation methods of infrared detector. The method comprises: providing a ceramic package infrared detector assembly, the two ends of the sheet-shaped non-evaporable getter in the assembly are fixed on two first type conductive columns;Electricity contact probe is contacted with the first type conductive column;Preheating current is applied to the getter through the first type conductive column, then high-frequency pulse current is applied to activate, so that the getter body reaches the activation temperature due to Joule effect;During the pulse current activation process or after activation, the detector chip is subjected to low-temperature thermal stabilization treatment. The application realizes the rapid local activation of the getter by pulse current, shortens the process time, reduces the energy consumption, avoids thermal damage, and improves the performance of the detector, and is especially suitable for ceramic packaged infrared detectors.

This method for estimating the temperature of a semiconductor device comprises: a step for supplying a heating current to a DUT; a step for supplying a measurement current to the DUT; a step for stopping the heating current to allow the DUT to dissipate heat; a step for acquiring a voltage drop of the DUT in the preceding step; and a conversion step. In advance, for a second semiconductor device under test, a temperature / voltage drop curve is measured in which the voltage drop of a second measurement target portion changes with at least one of maximum and minimum values as the temperature of the second measurement target portion decreases. In the conversion step, time-series data of the voltage drop of a first measurement target portion of the DUT is converted into time-series data of the temperature of the first measurement target portion using the one-to-one correspondence between the temperature of each and every second measurement target portion with the voltage drop of the second measurement target portion in the temperature / voltage drop curve.

This application provides a heating circuit and heating device for a curved blackbody radiation source. The heating circuit includes: a heating device connected to a relay for generating a heating current based on the relay current; a temperature sensor connected to the heating device for acquiring the temperature of the heating device; a temperature control system connected to the temperature sensor for generating a control signal based on the temperature; and a relay connected to the temperature control system for generating different relay currents based on the control signal. The heating current is converted into thermal energy by the heating device to heat the curved blackbody. This ensures that the heating of the spherical blackbody is as uniform as possible, and since the heating device can control the heating process according to the temperature control system, it ensures convenient and quick heating of the spherical blackbody under repeated heating conditions.

The application provides a pipe defect risk early warning method based on industrial big data, and belongs to the technical field of early warning. The pipe defect risk early warning method based on industrial big data comprises the following steps: S1: collecting a multi-section heating current sequence of a pipe extruder barrel and a circumferential dielectric capacitance distribution sequence of a cooling and demolding section; S2: performing smoothing processing on the multi-section heating current sequence, extracting a thermal pulsation range difference representing melt plasticization fluctuation, and extracting a dielectric divergence feature representing pipe internal compactness abnormality based on the circumferential dielectric capacitance distribution sequence; S3: time window registering the thermal pulsation range difference and the dielectric divergence feature, and constructing a plasticization-dielectric coupling scatter point set reflecting pipe forming quality in a two-dimensional space; and S4: periodically calculating a minimum circumscribed polygon area of the plasticization-dielectric coupling scatter point set, and defining an expansion slope of the area with time as a pipe degradation incubation index.

The invention discloses a new energy electric compressor preheating and soft start cooperative control method, and belongs to the technical field of new energy automobile thermal management. The method comprises the steps that the temperature of a compressor shell and the temperature of cooling liquid are obtained, and whether low-temperature preheating conditions are met or not is judged; if yes, specific preheating current is applied to enable the winding to heat so as to heat the refrigerating machine oil, and parameters such as winding resistance are monitored in real time; dynamically judging the starting opportunity based on the resistance variable quantity, and seamlessly switching to a soft starting mode after a threshold value is reached; smooth starting is achieved through frequency conversion control signals of frequency connection, the soft starting voltage boosting amount is dynamically optimized according to the preheating effect, and finally the compressor is stably increased to the target rotating speed. Through cooperative control and parameter linkage of preheating and soft starting, low-temperature starting resistance and current impact are effectively reduced, the reliability and energy efficiency of the system are improved, and the service life of the system is prolonged.

The application discloses a nuclear magnetic resonance probe system and relates to the field of nuclear magnetic resonance analysis. In the nuclear magnetic resonance probe system, a radio frequency signal heating current synthesizer is connected with a radio frequency signal heating current separator in a cavity through a single cavity interface; the radio frequency signal heating current separator is connected with a radio frequency coil and a heating system; the radio frequency coil is wound outside a sleeve; the heating system is wound outside the radio frequency coil; the sleeve covers a target core; the cavity is located between two magnets; the radio frequency signal heating current synthesizer combines a radio frequency signal and a heating current; the single cavity interface transmits the combined mixed signal to the radio frequency signal heating current separator; the radio frequency signal heating current separator separates the radio frequency signal from the mixed signal and transmits the radio frequency signal to the radio frequency coil, and separates the heating current from the mixed signal and transmits the heating current to the heating system; the radio frequency coil receives the nuclear magnetic resonance signal of the oil and water displaced in the target core. The application can improve the reliability and thermal efficiency of the system and reduce the cost of the system.

The invention discloses a water dispenser outlet water temperature control system based on big data acquisition, which relates to the technical field of intelligent household appliance control and comprises a data acquisition module, a processing module, a feature fusion module, a temperature prediction module, a parameter calculation module and a control execution module which are connected in sequence. The system collects multi-source data such as user water receiving behavior time sequence data, environment temperature, heating current and actual water outlet temperature. Using habit features are extracted by analyzing user behavior time sequence data, trend features are extracted by analyzing environment temperature data, and comprehensive working condition feature vectors are constructed by fusing with heating current. And inputting the vector and the real-time water temperature into a dynamic temperature prediction model, predicting a future temperature offset, calculating a target control parameter of the heating element, and issuing and executing the target control parameter. According to the method, prospective control is achieved by predicting the user habits and the temperature change trend, invalid energy consumption is reduced, system thermal inertia is effectively compensated, and the stability of the outlet water temperature and the response speed are improved.

This invention provides a method for estimating the temperature of a semiconductor device that exhibits the same voltage drop at multiple temperatures. [Solution] The method for estimating the temperature of a semiconductor device includes the steps of supplying a heating current to the DUT, supplying a measurement current to the DUT, stopping the heating current to allow heat to dissipate from the DUT, acquiring the voltage drop of the DUT in the said step, and a conversion step. Prior to this, for the second semiconductor device to be measured, a temperature / voltage drop curve is measured in which the voltage drop of the second measurement target changes with at least one of a maximum and minimum value as the temperature of the second measurement target decreases. In the conversion step, the time-series data of the voltage drop of the first measurement target of the DUT is converted into time-series data of the temperature of the first measurement target, by utilizing the fact that the temperature of all second measurement target locations in the temperature / voltage drop curve corresponds to the voltage drop of one second measurement target location.

The embodiment of the invention provides a current collector preheating device, dry-method electrode film rolling equipment and a rolling method, and the preheating device comprises a cavity, a first probe and a second probe. The cavity is used for heating the current collector. The first probe is arranged in the cavity, and the first probe is configured to measure the first temperature of the current collector before the current collector enters the cavity. And the second probe is arranged in the cavity, the second probe and the first probe are oppositely arranged, and the second probe is configured to measure the second temperature after the current collector leaves the cavity. The current collector is preheated through the cavity, and the double temperature probes are arranged to detect and control the temperature, so that the interface of the current collector reaches an effective softening window of an adhesive before entering a hot roller, weak layers and cracks are avoided through double-sided synchronous compounding, the average value of peel strength is improved, inter-batch fluctuation and in-plane dispersion are reduced, and the service life of the current collector is prolonged. And the interface bonding strength of the current collector is obviously improved and stabilized.

Capacitive sensor (1) configured to be connected between a heating element (12) and a heating power supply (2) and to use the heating element (12) as an antenna electrode, comprising a common-mode choke (5) with a first and a second inductively coupled winding, wherein the first winding is provided for connection between a first connection point (5.1) of the heating current supply (2) and a first connection point (5.2) of the heating element (12) and the second winding is provided for connection between a second connection point (5.3) of the heating element (12) and a second connection point (5.4) of the heating current supply (2); a control and evaluation circuit configured to inject an alternating current signal into the heating element (12) via a measuring node (17.2; 24) in order to measure a voltage on and / or a current through the measuring node (17.2; 24) and to derive an impedance (13) between the heating element (12) and a counter electrode from the measured voltage and / or current, characterized by the fact that the common-mode choke (5) has a third winding which is inductively coupled to the first and second windings, wherein the measuring node (17.2; 24) is effectively coupled to the third winding to inductively feed the AC signal into the heating element (12).

The invention discloses a portable electric melting ladle control method and device based on intelligent detection. The method comprises the steps that the resistance value of a resistance wire obtained through detection and the environment temperature obtained through detection are obtained; acquiring a basic heating parameter corresponding to the resistance value of the resistance wire according to a heating configuration strategy; the basic heating parameters are corrected according to the correction strategy and the environment temperature, and corresponding corrected heating parameters are obtained; the current control module is controlled according to the corrected heating parameters so as to control the heating current output to the resistance wire by the current control module; heat dissipation control parameters corresponding to the corrected heating parameters and the environment temperature are obtained according to a heat dissipation configuration strategy; and controlling the heat dissipation module according to the heat dissipation control parameters. According to the method, by matching the resistance value of the resistance wire with the environment temperature and combining parameter correction, the corrected heating parameters are accurately obtained for heating control; and meanwhile, the matched heat dissipation control parameters are obtained for heat dissipation control, so that the power supply control accuracy of the electric melting bag is greatly improved.

The invention relates to the technical field of infrared imaging, and provides a Joule thermal compensation circuit and device for an uncooled infrared detector, and the circuit comprises an integrator and a current source. Wherein the temperature characteristic of the current source is the same as the variation trend of the bias current of the sensitive pixel resistor; the integrator is used for integrating the current source to generate linearly changed output voltage; the output voltage is used for counteracting Joule thermocurrent. According to the invention, non-linear change of integrator output caused by the Joule heating effect can be compensated in real time, basic linearity of output is ensured, and an output dynamic range as large as possible is obtained.

A device for thermal control of a battery system includes a heating control module configured to generate an alternating current (AC) heating current and heat the battery system to a desired temperature by applying the AC heating current to the battery system over a selected heating time duration. The heating control module is configured to monitor a rate of increase of a temperature of the battery system during the applying, during the heating time duration, perform a periodic impedance measurement, the periodic impedance measurement including application of a measurement signal having a selected frequency range to the battery system for a measurement period, a length of the measurement period select to minimize a difference between a desired rate of increase and the monitored rate of increase, and adjust the AC heating current during the applying based on the temperature and the impedance measurement.

Capacitive sensor device (31) designed to be connected between an electrical heating element (52) and a heating power supply (46) and to use the electrical heating element (52) as an antenna electrode, comprising - a common-mode choke (43) with a first and a second inductively coupled winding (44, 45), wherein the first winding (44) is designed to be connected between a first terminal (47) of the heating current supply (46) and a first terminal of the electric heating element (52), and wherein the second winding (45) is designed to be connected between a second terminal of the electric heating element and a second terminal (48) of the heating current supply (46); and - a control and evaluation circuit (32) designed to feed a periodic alternating measurement signal into the electrical heating element (52) via a measuring node (40), to measure an electrical quantity through the measuring node (40) and to derive an electrical impedance (53) between the electrical heating element (52) and a counter electrode based on the measured electrical quantity; characterized in that the control and evaluation circuit (32) comprises the following: - a third common-mode choke winding (33) which is inductively coupled to the first winding (44) and the second winding (45) of the common-mode choke (43); - a periodic signal voltage source (36) designed to apply an AC measuring voltage to an output terminal, wherein the output terminal is electrically directly connected to a first connection (34) of the third common-mode choke winding (33); - an electrical quantity measurement circuit (37) with a signal input terminal (38) and a reference input terminal (39) designed to determine the electrical quantity through the measuring node (40) using an electrical reference quantity provided to the reference input terminal (39), wherein the signal input terminal (38) is electrically connected to a second terminal (35) of the third common-mode choke winding (33) and the reference input terminal (39) is electrically connected to an earth conductor providing an AC earth potential; and - an EMI filter network (41) which is electrically connected via the signal input terminal (38) and the reference input terminal (39) of the electrical quantity measurement circuit (37).

A composite pane with an HUD region and a sensor region is provided with an electrically conductive coating that reflects the p-polarized radiation of the HUD projector. The electrically conductive coating has precisely one electrically conductive layer based on silver, below which a lower dielectric layer or layer sequence with a refractive index of at least 1.9 is arranged and above which an upper dielectric layer or layer sequence with a refractive index of at least 1.9 is arranged. The ratio of the optical thickness of the upper dielectric layer or layer sequence to the optical thickness of the lower dielectric layer or layer sequence is at least 1.7. A busbar provided for connection to a voltage source is arranged on both sides of the sensor region and is connected to the coating such that a current path for a heating current is formed between the busbars.

Examples described herein provide a method for direct current (DC) fast charging of a battery cell of a vehicle. The method includes determining an anode potential current to be applied during the DC fast charge. The method also includes determining a heat generating current to be applied during the DC fast charge. The method also includes determining a cell voltage current to be applied during the DC fast charge. The method further includes selecting a minimum current from the anode potential current, the heat generation current, and the cell voltage current. The method also includes charging a battery cell of the vehicle based on the minimum current.

The application discloses a power cable sheath insulation online state monitoring method, and mainly relates to the technical field of online state monitoring, and aims to solve the problems that the single parameter monitoring of the existing scheme is difficult to reflect the multi-field coupling mechanism of insulation deterioration, the infrared temperature measurement is affected by environmental radiation and surface emissivity, offline detection needs power-off operation, and response lag exists. The method comprises the following steps: taking a graph structure state flow as input, driving a physical simulation engine based on electromagnetic-thermal-current three-field coupling, simulating the transient charge migration path of partial discharge pulses in the XLPE sheath; solving the modified Maxwell equation set to generate the transient electromagnetic fingerprint corresponding to each node; inputting the insulation deterioration electromagnetic fingerprint into a multi-agent game model based on information entropy flow, regarding each cable node as an agent with state evaluation capability, and outputting a dynamic decision signal of the insulation health state.