42 results about "Dissipated power" patented technology

The invention provides a traction power supply system control method based on multi-objective optimization, and the method comprises the following steps: S1, determining an initial control variable of a traction system, the initial control variable comprising converter power of an alpha power supply side and a beta power supply side of the traction power supply system and train braking resistor dissipation power of the alpha power supply side, the initial control variable is used as input to construct a regenerative braking energy MPC prediction model; s2, predicting a state variable of a next moment based on a regenerative braking energy MPC prediction model, wherein the state variable comprises output power of a traction substation, total dissipation power of a brake resistor, output power of an energy storage system and a charge state of the energy storage system; and S3, constructing a multi-objective optimization function based on the state variable at the next moment, converting the multi-objective optimization function into a quadratic programming form for solving to obtain a control variable sequence, and taking a first item of the control variable sequence as control input to control the traction power supply system to work.

The embodiment of the invention discloses a shunt current measurement compensation method. The method comprises the following steps: acquiring an update voltage and an update current of a shunt and a sampling temperature corresponding to a first temperature sampling point; determining dissipation power according to the update voltage and the update current, and calculating an actual temperature corresponding to the shunt according to the dissipation power and a sampling temperature corresponding to the first temperature sampling point; compensating the updated voltage according to a preset linear temperature formula and the actual temperature corresponding to the diverter to obtain a compensation resistor corresponding to the diverter; and obtaining a measurement voltage corresponding to the shunt, and obtaining a compensation current corresponding to the shunt according to the compensation resistor and the measurement voltage. By implementing the embodiment of the invention, the accuracy of current measurement can be remarkably improved, and the accuracy of current measurement can also be ensured under the condition of long-time operation or environment temperature change.

An electronic device and a control method for controlling the electronic device is disclosed. The electronic device includes: a middle frame; a heat source mounted on the middle frame; a housing having a heat dissipation area and a non-heat-dissipation area, the heat source being located between the heat dissipation area and the middle frame, and a heat dissipation coefficient of the heat dissipation area being higher than that of the non-heat-dissipation area; and a processing module, configured to adjust heat dissipation power of the heat dissipation area according to a temperature of a non-contact position of the housing and a measured temperature of a contact position of the housing.

The invention belongs to the technical field of power equipment state monitoring and fault diagnosis, and particularly relates to a comprehensive distribution box state online monitoring method and system based on artificial intelligence, and the method comprises the steps: obtaining the terminal temperature of a monitoring point, the load current of a loop, and the environment temperature outside a distribution box, and carrying out the time sequence alignment of collected data; calculating real-time heat dissipation power and load heat shock source intensity of the monitoring points based on the aligned data; based on the real-time heat dissipation power, the load heat shock source intensity and the terminal temperature sequence, the equivalent electric heating impedance modulus of the monitoring point is obtained; and constructing a sliding time window based on the equivalent electrothermal impedance modulus, calculating the contact health degree in the sliding time window, and determining the operation state of the distribution box according to the contact health degree. According to the invention, the interference of the load current and the environment temperature is decoupled by constructing the physical inversion model, the thermal hysteresis phenomenon is effectively overcome, and accurate monitoring of contact aging and loosening faults is realized.

An active discharge circuit for an electric vehicle inverter, the active discharge circuit being intended to be connected in parallel with a DC link capacitor connected between a positive line and a negative line of a DC power link, wherein the circuit comprises a dissipation current source, a switch connected in series with the current source between the DC lines, and a controller connected to the switch and arranged to apply an activation signal in response to a control signal, the activation signal placing the switch in an on-state, wherein the current source is configured to draw a discharge current and dissipate any energy stored in the DC link capacitor when the switch is in the on-state. As long as the switch is closed by the activation signal, the current source draws a constant current and dissipates power, and the voltage across the DC link capacitor decreases linearly.

The invention discloses a power balance module suitable for a seabed observation network, an input side is connected with a main power conversion module of an underwater power supply, an output end is connected with a post-stage junction box, and the power balance module comprises a sampling unit which is used for collecting total current output by the main power conversion module at constant voltage and outputting collection parameters for closed-loop control of each power conversion module; the power distribution unit distributes the total current output by the underwater power supply to the power conversion unit and performs fault isolation; the plurality of power conversion units form series or parallel hot backup redundancy according to different connections of the power distribution units, and power dissipation is balanced in cooperation with a current sharing algorithm; each working power conversion unit quantitatively extracts power from the underwater power supply and supplies the power to the balance load for dissipation, and after the actual load is connected, converted electric energy is reduced in real time, the dissipation power of the balance load is reduced, and it is guaranteed that the output power of the underwater power supply is kept balanced; the balance load receives the electric energy output by the power conversion unit, converts the electric energy into heat energy and dissipates the heat energy through seawater.

The application discloses a kind of gate voltage intelligent control method, system and device of gallium nitride power transistor, it is related to communication technical field, by collecting the power supply voltage and power supply current of gallium nitride power transistor, and acquisition detection signal;Average direct current power is calculated based on power supply parameter, average output power is calculated based on detection signal, and then average dissipation power is obtained;With average dissipation power as input, based on the equivalent thermal network model of the thermal dynamic relationship between dissipation power and junction temperature that is pre-set, the junction temperature of gallium nitride power transistor is estimated in real time;With the first frequency monitoring junction temperature change, when exceeding preset threshold, generate gate voltage compensation signal according to voltage change slope limit mode;Meanwhile, with the second frequency higher than the first frequency, drain electrode electric parameter and temperature state are monitored, when meeting abnormal event condition, negative adjustment or shutdown operation is executed to gate voltage, and compensation adjustment is frozen.The application can realize accurate, stable gate voltage compensation.

The present invention relates to a voltage control and disconnection device to reduce the voltage of photovoltaic module strings when the weather conditions are such that the voltage can rise above 1500 VDC. To that end, the device has three inputs and one output, which connects to a photovoltaic module and to the adjacent photovoltaic module, the output leading to the inverter. The device measures the voltage of the photovoltaic module and, when a limit voltage that is internally preset based on the voltage of the module and the number of modules of the string is exceeded, it disconnects this photovoltaic module, reducing the string by one module. The disclosed invention provides the main advantage of better optimising the strings, at a much lower economic cost and with practically zero losses in dissipated power, while increasing the generation of daily energy of the photovoltaic farm, making it possible to always operate at the optimal voltage for the inverter.

A stack includes a first power semiconductor device in a first chip and a second power semiconductor device in a second chip. The first power semiconductor device is configured for active operation during which an application load current is conducted by the first power semiconductor device and power losses occur in the first power semiconductor device. The second power semiconductor device is configured for passive operation during which a voltage is blocked. The stack further includes a heat sink interface configured to dissipate the power losses. The second chip is arranged between the first chip and the heat sink interface.

An energy dissipation system (1) for a vehicle, in particular for a commercial vehicle, is disclosed, comprising: - an electric drive machine (5) designed to generate a braking effect on the vehicle in generator mode; - at least one electrically operated fluid conveying device (2), wherein the energy dissipation system (1) is designed to increase the current electrical power requirement of the at least one fluid conveying device (2) by a dissipation power requirement to a total power requirement, wherein the energy dissipation system (1) is designed to supply electrical power provided by the electrical machine (5) to at least one fluid conveying device (2) in order to meet its dissipation power requirements. Furthermore, a vehicle and a procedure are disclosed.

Methods and systems for connecting a photovoltaic module and an inverter having an input capacitor are presented. The photovoltaic system includes a maximum power point tracking (MPPT) controller coupled between the inverter and the photovoltaic module. The MPPT controller includes a direct current (DC) converter configured to reduce, in a forward buck mode, a voltage of the photovoltaic module, to supply power from the photovoltaic module to the input capacitor of the inverter. The photovoltaic system also includes a microcontroller unit (MCU) configured to control the DC converter to allow the photovoltaic module to operate at a maximum power point, and to increase, in a reverse boost mode, a voltage of the input capacitor of the inverter, to dissipate power from the input capacitor in the photovoltaic module, and the MPPT controller is configured to, based upon one or more triggers.

The invention relates to the technical field of steering systems, in particular to an EPS motor control DC-LINK temperature estimation method. The specific process comprises the following steps: S1, calculating a ripple current when an EPS motor controls DC-LINK to work; s2, obtaining the real-time equivalent series resistance of the EPS motor under different working conditions for controlling the DC-LINK; s3, calculating the real-time dissipation power of the EPS motor for controlling the DC-LINK to work; s4, obtaining a temperature rise curve of the EPS motor control DC-LINK under a specific condition through an experimental test; s5, calculating transient thermal resistance; s6, calculating the core temperature rise of the capacitor; and S7, calculating the actual temperature. Compared with the prior art, the EPS motor control DC-LINK temperature estimation method provided by the invention has the advantages that the EPS motor operation state parameters and the motor control temperature are calculated, and the DC-LINK real-time temperatures of the steering system under different operation conditions are estimated in combination with test data, so that a power-assisted motor control strategy is adjusted according to the DC-LINK real-time temperatures; and it is ensured that the steering system cannot be burnt out due to the too high DC-LINK temperature, and therefore the reliability and safety of operation of the steering system are improved.

A method of testing a semiconductor device, in a package, having a junction between a semiconductor material of a first type and a semiconductor material of a second type. The junction has a temperature dependent breakdown voltage, and the method includes the steps of determining the breakdown voltage, providing a fixed voltage over the junction, via pins of the package, and the fixed voltage is higher than the breakdown voltage, and measuring, via pins of the package, a breakdown current flowing through the junction, determining a dissipated power based on the fixed voltage and the measured breakdown current, and the dissipated power is a qualitive measure for the semiconductor device.

The invention is suitable for the technical field of data processing, and provides a parameter acquisition method and device of a transistor, terminal equipment and a medium, and the method comprises the steps: obtaining a plurality of first pulse IV curve graphs obtained through the pulse IV test of the transistor under a plurality of dissipation powers, performing a pulse IV test at a plurality of substrate temperatures to obtain a plurality of second pulse IV curve graphs; determining a first transconductance maximum value corresponding to each dissipation power according to the plurality of first pulse IV curve graphs, and generating a first curve according to the first transconductance maximum value corresponding to each dissipation power; determining a second transconductance maximum value corresponding to each substrate temperature according to the plurality of second pulse IV curve graphs, and generating a second curve according to the second transconductance maximum value corresponding to each substrate temperature; and calculating the ratio of the dissipation power to the channel temperature of the transistor according to the first curve and the second curve. According to the method, the ratio is determined through the maximum transconductance value, and the determination accuracy of the ratio is improved.

A programmable thermal dissipation power (TDP) system with integrated circuits is provided. The programmable TDP system includes a software interface, a monitoring circuit, and a controller circuit. The monitoring circuit may provide for the instantaneous input power supplied to the system. The controller circuit may monitor both the target TDP information specified from upstream and the input power readings. The controller circuit may generate a pulse-width modulation (PWM) signal that corresponds to a gap between the two power levels and sends the signal to the integrated circuits on the system. The integrated circuit may respond to the change in the input PWM signal and may adjust its power consumption. For example, the integrated circuit may adjust the clock frequency, adjust the instruction rate, skip a number of clock cycles, etc.

This application relates to the field of motor performance testing technology, and particularly to a method, apparatus, electronic device, and storage medium for determining the mechanical losses of a motor. The method includes: controlling the motor under test to enter a preset free-fall state, wherein the rotor permanent magnet of the motor under test is a non-magnetized magnet; acquiring multiple speed values ​​of the motor under test in the preset free-fall state and the corresponding acquisition time for each speed value, and generating speed-time data pairs for the motor under test based on each speed value and each acquisition time; calculating the instantaneous dissipation power of the rotational kinetic energy of the motor under test based on the speed-time data pairs, and determining the mechanical loss power of the motor under test at different speed values ​​based on the instantaneous dissipation power. This solves the problems of complex, costly, and limited accuracy in mechanical loss measurement processes caused by the need to separate copper losses, iron losses, and eddy current losses in related technologies, and achieves non-destructive, rapid, and high-precision measurement of the mechanical losses of a motor across its entire speed range.

This invention discloses an online defect detection method for gridless photovoltaic (PV) panels, comprising the following steps: acquiring a lifetime distribution map of the gridless PV cell using time-resolved photoluminescence; acquiring a heat dissipation map of the gridless PV cell using optically induced phase-locked thermal imaging; and acquiring an ultrasonic image of the gridless PV cell using laser ultrasound. The lifetime distribution map, heat dissipation map, and ultrasonic image are preprocessed and registered to be uniformly mapped to the cell coordinate system, and minority carrier lifetime, heat dissipation power, ultrasonic propagation time delay offset, and scattering energy are extracted, which, together with the thermal phase, constitute multimodal features. Based on anomaly scores, defects are detected and classified according to the multimodal features of potential defect areas, yielding classification results for electrical defects, thermal defects, and mechanical defects. This invention also discloses a system for implementing this method. This invention achieves full-coverage detection of electrical, thermal, and mechanical defects.

The invention relates to a coaxial cable damage detection device and detection method for a semiconductor manufacturing process, a first detection device is arranged at the joint of a coaxial cable and a power supply, a second detection device is arranged at the joint of the coaxial cable and a matcher, and measurement data is transmitted to a control system for calculation and judgment. When the dissipation power measurement value exceeds the preset dissipation power set value, an alarm is triggered immediately to inform an operator to process, so that the monitoring of the operation state of the coaxial cable becomes possible, and the defect that the coaxial cable lacks an effective monitoring means is overcome; a dissipation power set value formula of the coaxial cable under a constant use condition is introduced, a system can accurately set a dissipation power set value conforming to the actual characteristics of the cable under a stable work condition, and a correction coefficient under the change of the use condition is introduced, so that the system can accurately set the dissipation power set value. The control system can dynamically adjust the dissipation power set value according to the change of the environment temperature, humidity and working frequency, and compensates the influence on the power loss of the cable due to the change of working conditions.

The invention provides a parallel packaging structure of a vertical semiconductor device, the structure comprises a source electrode metal bottom plate, a lower chip, a middle metal layer, an upper chip and a top metal layer which are laminated from bottom to top, the source electrode metal bottom plate is communicated with a source electrode of the lower chip, the top metal layer is communicated with the source electrode metal bottom plate and the source electrode of the upper chip, and the middle metal layer is communicated with the upper chip. The middle metal layer is communicated with the drain electrode of the lower chip and the drain electrode of the upper chip, and the projection of the lower chip on the middle metal layer and / or the projection of the upper chip on the middle metal layer are / is located in the range of the middle metal layer, so that the limitation of the chip area can be reduced, the maximum current and the dissipation power of the semiconductor device are improved, and the current processing capability is improved; and poor contact or wrong contact caused by displacement is avoided.

The utility model aims to provide the device for reducing the dissipated power of the device, which can reduce the dissipated power of the device, reduce the heating of the device, prolong the service life of the device and improve the output range of the voltage source without changing the key device. The circuit comprises an operational amplifier, a first power converter and a first digital-to-analog converter, the non-inverting input end of the operational amplifier is connected to the output end of an external error amplifier, the VIN end of the first power converter is connected to an external input voltage, and the SDA end and the SCL end of the first digital-to-analog converter are connected to an external upper computer. The VOUT end of the first digital-to-analog converter is connected with the FBX end of the first power converter, the BIAS end of the first power converter is connected with the V + end of the operational amplifier, namely the positive power supply voltage PPVCC of the operational amplifier, and the output end of the operational amplifier serves as the output voltage AMPOUT of a voltage source. The utility model is applied to the technical field of automatic test equipment.

A method (110) for managing a heating thermal power of at least one battery comprised in a vehicle having at least one electric traction motor. The method comprises: - determining (80) a heat rejection of the at least one battery; - determining (82) a first heating thermal power based on the heat rejection of the at least one battery and a current driving mode, said first heating thermal power being related to a heating of the at least one battery in presence of a motion of the vehicle using said current driving mode; - determining (84) a second heating thermal power based on the heat rejection of the at least one battery, said second heating thermal power being related to a heating of the at least one battery in presence of a charging phase of the vehicle having a maximum electrical power available for charging the at least one battery; - determining (86) a thermal dissipation power of the at least one battery; and - determining (88) a third heating thermal power to condition the at least one battery based on the first heating thermal power, the second heating thermal power and the thermal dissipation power.

This invention relates to the field of smart grid technology and discloses a life-cycle economic evaluation system for rural photovoltaic equipment. The system includes: acquiring the overlapping area of ​​the bottom edge retention zone of the photovoltaic module and the bypass diode protection zone to construct spatially segmented economic units and calculating the retention intensity; establishing a material balance equation based on external environmental factors to obtain the dynamic deposition load; converting the load into spectrally weighted transmittance and substituting it into an equivalent circuit model to obtain non-uniform power loss and output power under ash accumulation conditions; calculating the lifespan consumption rate using equivalent operating temperature and dissipation power, and correcting it to obtain the actual output power after aging; determining the marginal economic value by combining electricity load data and calculating the spatially segmented revenue loss; calculating the operation and maintenance and replacement costs caused by local exposure based on the instantaneous failure rate; and finally summarizing various costs and revenue losses based on a discount factor to output a comprehensive life-cycle economic indicator.

The utility model belongs to the circuit field, and especially relates to a battery constant voltage LED drive circuit comprising a boost module, a step-down module and an anti-backflow circuit, a common terminal of the boost module and the step-down module is provided with an access terminal used for connecting an LED lamp, and the anti-backflow circuit is arranged between the access terminal and the step-down module. According to the utility model, through the arrangement of the boost module and the step-down module, the step-down module can be used for step-down in a high-voltage state and also can be used for step-up in a low-voltage state, the anti-backflow circuit can prevent the current after step-up from flowing back to the power supply through the step-down module, and the modules are high in conversion efficiency, small in dissipation power and high in reliability. The low-voltage state electric energy of the battery can be effectively utilized, and obvious practical value and economic benefit are achieved.

The invention discloses an active variable power resistor based on triode dissipation power, which comprises an active resistor power supply, a power-saving switch circuit, an excitation triode circuit, an excitation triode base power supply circuit, a power tube circuit, a power tube emitter bias resistance circuit, a galvanometer circuit and a to-be-debugged power supply circuit, a power supply Uv is connected with a working ground sequentially through a power-saving switch circuit switch K and a resistor body of a variable potentiometer P1, a sliding end of the P1 is connected with a base electrode of an excitation triode circuit T2, a collector electrode of the T2 is connected with a positive electrode of a to-be-debugged power supply circuit, an emitting electrode of the T2 is connected with a base electrode of a power tube circuit T1, and a collector electrode of the T1 is connected with the positive electrode of the to-be-debugged power supply circuit through a galvanometer A; the emitter of the T1 is connected with a working ground through a bias resistor RE, the negative electrode of the active resistor power supply Uv is in short circuit with the negative electrode of the to-be-debugged power supply circuit to serve as the working ground, and the dissipation power of the T1 serves as the load of the to-be-debugged power supply.

In an electronic system such as an electric vehicle, damaging overvoltage may be generated very quickly without warning, requiring a rapid response to protect the system. In some embodiments herein, an electronic system may be protected from overvoltage using a hardware-based protection circuit. The protection circuit may include a dissipation resistor, a switch for connecting the resistor to a bus of the electronic system, and a hardware control circuit configured to monitor a bus voltage magnitude of the bus. If the control circuit detects that the bus voltage magnitude is greater than an overvoltage threshold, it may cause the switch to connect the resistor to the bus to dissipate power in the bus. Then, after a minimum time has elapsed, if the bus voltage magnitude has dropped below the overvoltage threshold, the hardware control circuit may cause the switch to disconnect the resistor from the bus.

The invention discloses an intelligent grid voltage control method, system and device for a gallium nitride power transistor, and relates to the technical field of communication. The method comprises the steps of collecting power supply voltage and power supply current of the gallium nitride power transistor, and collecting a detection signal; calculating average direct-current power based on the power supply parameters, calculating average output power based on the detection signals, and further obtaining average dissipation power; estimating the junction temperature of the gallium nitride power transistor in real time based on a preset equivalent thermal network model reflecting a thermal dynamic relationship between the dissipation power and the junction temperature by taking the average dissipation power as input; monitoring junction temperature change at a first frequency, and generating a grid voltage compensation signal in a voltage change slope limiting mode when a preset threshold value is exceeded; and monitoring the electrical parameter and the temperature state of the drain electrode at a second frequency higher than the first frequency, executing negative adjustment or turn-off operation on the grid voltage when an abnormal event condition is met, and freezing compensation adjustment. According to the invention, accurate and stable grid voltage compensation can be realized.

The invention relates to the technical field of semiconductor switching switches in the pulse power technology, and discloses an SPDS device for a high-voltage subnanosecond pulse power supply and a manufacturing method of the SPDS device for the high-voltage subnanosecond pulse power supply, and the manufacturing method comprises the following steps: taking P-type or N-type silicon as a substrate, carrying out diffusion processing on two sides of the substrate to form first middleware, the two sides of the first middleware can be divided into a marking side and a non-marking side; thinning the first middleware on the non-marking side to form a second middleware, and annealing the second middleware to form a third middleware; and performing diffusion treatment on the third middleware, and forming N + regions on two sides of the third middleware, thereby obtaining a fourth middleware. The charge throttling structure layers with specific concentration distribution are respectively manufactured in the P region and the N region of the SOS effect basic structure by adopting a multi-time and multi-step diffusion process based on a silicon semiconductor material, so that the on-resistance of the device is effectively reduced, the switching speed of the device is improved, and the dissipation power of the device is greatly reduced.

The invention relates to a cable single-phase earth fault arc simplified mathematical model simulation method and system. The method comprises the steps of designing a geometric model, boundary conditions and medium physical property parameters for magnetofluid MHD simulation; a fault arc physical model is obtained through magnetofluid MHD simulation; calculating simulation arc voltage, arc current and arc energy; arc conductance, dissipation power and a time constant are calculated, and functions of the dissipation power and the time constant about the arc conductance are obtained through fitting; replacing the dissipated power and the time constant in the classic Mayr arc model with a function about arc conductance to obtain an improved Mayr arc model; the obtained improved Mayr arc model is substituted into an ATP-EMTP power distribution network model, a cable single-phase earth fault simulation waveform is obtained, and a reliable and effective arc model can be provided for power distribution network cable single-phase earth fault simulation.

This invention provides a method and system for absorbing and limiting arc grounding overvoltage. The method includes acquiring three-phase voltage sampling data of a power distribution line, current sampling data corresponding to an overvoltage absorption and limiting module, and circuit breaker open / closed position information; detecting clamping truncation characteristics based on the voltage sampling data and determining clamping level parameters; extracting current characteristic parameters and determining the module's operating state when truncation characteristics are present; determining dissipation parameters based on voltage and / or current, calculating dissipated power and accumulating it to obtain cumulative energy consumption; outputting a tripping command when the cumulative energy consumption reaches the rated dissipated energy ratio; performing online open-circuit fault identification and event identification; determining short-circuit faults based on the threshold relationship between clamping level and overvoltage limit under truncation characteristics, generating an alarm, and uploading it to the dispatch system. The technical solution of this invention achieves arc grounding overvoltage clamping absorption and module fault self-diagnosis, improving the reliability and safety of system protection.