26 results about "Dissipated power" patented technology

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 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.

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.

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.

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 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 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.

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.

The application provides a design method of a wide input power range dual-frequency transistor-based rectifier. The application considers the dissipation power of the output capacitor of a GaN transistor-based rectifier, establishes the relationship between the dissipation power and the output capacitor of the GaN transistor, obtains the relationship between the rectification efficiency and the output capacitor, obtains different output impedances under different input powers, and thus obtains the corresponding output impedance design space; according to the theoretical impedance design space, the output matching network and the input matching network are designed by using a branch transmission line. According to the inverse-time binary principle, a phase shift network is added between the drain and the gate to realize a self-synchronous rectifier. The radio frequency input signal and the gate input signal of the rectifier are set to be phase-shifted at two target frequencies, and the design of the phase shift network is completed accordingly. The output matching network, the input matching network and the phase shift network are optimized by using an improved multi-objective particle swarm algorithm based on a differential evolution strategy, so that the designed rectifier can maintain high efficiency in a wide input power dynamic range, and the design accuracy and efficiency can be improved.

The utility model discloses a circuit device for comparing dissipation power of different MOS (Metal Oxide Semiconductor) tubes. The device comprises an MOS tube driving operation part and a surface temperature rise thermal imaging acquisition part. The MOS tube driving operation part comprises a power supply and a circuit board, the test MOS tube is arranged on the circuit board, and the circuit board is electrically connected with the power supply; and the surface temperature rise thermal imaging acquisition part comprises a thermal imaging instrument, and the thermal imaging instrument is used for measuring and testing the surface temperature of the MOS tube shell. According to the utility model, by inputting driving signals with different frequencies, the tested MOS tube is in a working state and the temperature change of the housing is recorded, and by comparing the temperature rise values of the housings of different MOS tubes under the same driving frequency, the optimal MOS tube under the required driving frequency is selected.

The utility model discloses a triode linear constant current circuit with resistance shunting, comprising a power supply voltage input end which is connected with an output cathode LED-of the circuit after sequentially passing through a base electrode driving resistor, a negative feedback triode and a plurality of constant current units arranged in parallel. Meanwhile, a power supply voltage input end is connected with an output positive electrode LED + of the circuit, a base electrode of the negative feedback triode is connected with any one of the constant current units through the negative feedback resistor, a collector electrode is connected with the base electrode driving resistor, and an emitter electrode is grounded. According to the utility model, the constant current unit is connected in parallel with the constant current triode through the shunt resistor, and current flowing through the constant current unit and the constant current triode passes through the same sampling resistor to generate negative feedback voltage, so that the triode linear constant current circuit unit with the shunt resistor is formed; the use amount of triodes can be reduced under the condition that the power of the driving circuit is equal, and the circuit cost is reduced.

The utility model provides a surge voltage suppression control circuit and electrical equipment, which comprises a power supply circuit, a switch circuit, a multi-stage surge suppression circuit and a post-stage circuit which are connected in sequence, the multi-stage surge suppression circuit comprises a first-stage suppression circuit to an Nth-stage suppression circuit which are connected in series, and N is a positive integer greater than or equal to 2. Each stage of suppression circuit comprises an MOS tube, a surge suppression trigger circuit and a sampling circuit; for the first-stage suppression circuit, the source electrode of the MOS tube is connected with one output end of the sampling circuit, the first end of the surge suppression trigger circuit and the drain electrode of the MOS tube are connected with the positive voltage end of the power supply circuit, and the second end, the third end and the fourth end of the surge suppression trigger circuit are connected with the other output end of the sampling circuit, the grid electrode of the MOS tube and the input end of the sampling circuit respectively. According to the technical scheme, the problem that high-voltage surge suppression cannot be achieved due to the fact that the dissipation power of the MOS tube is too large in the prior art can be solved.

The application discloses a power balance module suitable for a sea bottom observation network, a main power conversion module connected with an underwater power supply on an input side, and a rear-stage connection box connected with an output end, and the power balance module comprises: a sampling unit which collects total current output by the main power conversion module in a constant voltage mode and outputs collected parameters to provide closed-loop control for each power conversion module; a power distribution unit which distributes the total current output by the underwater power supply to the power conversion units and performs fault isolation; a plurality of power conversion units which form series or parallel type hot backup redundancy according to different connections of the power distribution unit, balance power dissipation by cooperating with a current sharing algorithm; each working power conversion unit quantitatively extracts power from the underwater power supply to supply a balance load to dissipate power, when an actual load is connected, real-time reduced converted electric energy, reduced balance load dissipation power, and the underwater power supply output power is maintained in balance; and a balance load which receives electric energy output by the power conversion unit and converts the electric energy into heat energy to dissipate through seawater.

When a signal glitches, the logic receiving the signal can change response, charging and / or discharging nodes within the logic and dissipating power. Providing glitch-free signals can reduce the number of times nodes are charged and / or discharged, reducing power consumption. A technique for removing glitches is to insert a storage element that samples the signal after the signal change is complete to produce a glitch-free output signal. The storage element is enabled by a "ready" signal that has a delay that matches the delay of the circuit generating the signal. This technique can prevent the output signal from changing until the final value of the signal is reached. The output signal only changes once, typically reducing the number of times nodes in the logic receiving the signal are charged and / or discharged, also reducing power consumption.

comprising a protective circuit (1) for a device or power circuit breaker, • an active controllable component (B1) which can be controlled in a linear range, • at least one measuring device (S P , S U , S i , S Uin , S Uout ) to determine a power output that is implemented in the actively controllable component (B1), • a processing unit (uC), • where an energy equivalent can be determined based on the specified power and a time between two measurements, • where time-separated energy equivalents are combined by the processing unit (uC), • where at least two time-related limit values ​​(G t1 , G t2 , ... G tn ) are planned, • where, upon reaching and / or exceeding a limit value (G t1 , G t2 , ... G tn) by an energy equivalent or the combined energy equivalents in a limit value (G t1 , G t2 , ... G tn ) assigned time the active controllable component (B1) is controlled by the processing unit (uC) in such a way that the current flow through the active controllable component (B1) is reduced or prevented.

The invention provides a simulation method and system for an AC energy consumption device for a flexible DC power transmission system, and the method comprises the steps: building the power flow and transient simulation basic data of the AC energy consumption device, and sequentially carrying out the simulation of a transformer of the AC energy consumption device and other parts of the AC energy consumption device, carrying out power flow and transient modeling on a line between the AC energy consumption device and the converter station to generate corresponding first modeling data, second modeling data and third modeling data; a first fault disturbance operation card and a second fault disturbance operation card for simulating the input moment and the quit moment of an energy consumption resistor and an output variable card for monitoring the dissipation power of an alternating current energy consumption device and the energy consumption resistor are arranged in transient stability operation, and transient stability calculation is executed according to the operation cards and the output variable card. The method and the system ensure that a user can quickly, accurately and conveniently carry out modeling calculation and analysis of the AC energy consumption device for the flexible DC power transmission system.