339 results about "Load resistance" patented technology

The invention discloses an on-line monitoring and early warning method for a bus capacitor of an electric driving system, and belongs to the field of electric driving systems. The electric driving system sequentially comprises an isolating circuit, a full-wave bridge rectifier, a bus capacitor bank, an inverter, an actuator and a capacitance online testing device; the capacitor online testing device comprises a relay, a load resistor, a voltage acquisition module, a current acquisition module and a master control calculation unit. When the electric drive system is idle, a load resistor is connected to construct a test path, and current and voltage signals are collected; disconnecting a test path, constructing a degradation characterization quantity of multi-index information fusion through time-frequency domain feature extraction, and constructing an equal-length time interval sequence degradation curve; and the TCN-BRU-GRU combined prediction model carries out trend feature learning and training on the degradation curve. According to the method, waveform fitting and local and global data feature capturing of non-equal-interval time sampling are achieved, trend prediction of bus capacitor performance degradation is achieved, early warning is conducted before failure of the bus capacitor, and safe and reliable operation of an electric drive system is guaranteed.

The present application relates to a method and apparatus for controlling a wireless electrical energy transmission system, and a computer device. The method comprises: determining a real-time load resistance of a wireless electrical energy transmission system, and obtaining a trained value table, the trained value table comprising a sample load resistor, a sample primary resonant capacitor, and a sample value of correspondence between each sample load resistor and each sample primary resonant capacitor; in the trained value table, determining a real-time primary resonant capacitor of the wireless electrical energy transmission system on the basis of the real-time load resistance and the sample value; and controlling the wireless electrical energy transmission system on the basis of the real-time primary resonant capacitor. By adopting the present method, the convenience of control can be improved.

The invention discloses a three-phase wireless electric energy and signal reverse cooperative transmission system and a parameter design method thereof. The system comprises a direct-current power supply, a three-phase high-frequency inverter circuit, a three-phase primary side compensation capacitor, a three-phase secondary side compensation capacitor, a three-phase primary and secondary side magnetic coupling coil, a signal transmission channel network, a signal modulation-demodulation circuit network, an encoder, a decoder, a three-phase rectification filter circuit, a filter capacitor and a load resistor. The signal transmission channel networks respectively comprise three signal injection networks and three signal separation transmission channel networks; each signal injection network comprises a secondary side signal injection transformer, a secondary side injection signal resonant capacitor and a discharge resistor; and each signal separation transmission channel network comprises a primary side signal pickup transformer, an extraction signal resonant capacitor, a wave blocking network inductor, a wave blocking network capacitor and a sampling resistor. According to the invention, three-phase wireless energy and information parallel reverse transmission is realized, and the signal transmission rate is effectively improved while stable and efficient electric energy transmission is ensured.

The utility model discloses a calibration device for a track circuit dynamic detection system, and relates to the technical field of track circuit dynamic detection. The device comprises a signal source module, a power amplifier, a load resistor and an ampere meter, the controller outputs a control signal to the signal generator; the signal generator outputs a current signal to the gain regulator based on the control signal; the gain regulator outputs the current signal after gain regulation to the power amplifier based on the current signal; the power amplifier outputs an amplified current signal to the load resistor based on the current signal after gain adjustment; according to the utility model, the precision and the stability of the output current signal can be improved, and the stability, the accuracy and the efficiency of the calibration of the track circuit dynamic detection system can be improved.

The utility model discloses a multi-range current acquisition circuit, which comprises a load current acquisition circuit and a current bypass circuit, the load current acquisition circuit is connected in series between a power supply and a load resistor RX, and the current bypass circuit is connected in parallel with one side of the load current acquisition circuit. According to the utility model, the current bypass circuit is designed to be connected in parallel with one side of the load current acquisition circuit, so that current acquisition is not influenced after normal switching of the load current acquisition circuit, and a new current path can be provided when the acquisition circuit is not switched so as to ensure that the load at the output end can work normally.

The invention discloses a rapid soft start control method and device for a switching power supply. The method comprises the following steps: determining a target voltage output by a soft start preprocessing circuit in a steady state according to a preset standard voltage, a preset standard current and a load resistance value of a resistive load; determining a target duty ratio corresponding to a switching tube of the soft start preprocessing circuit in a steady state according to the target voltage and a preset input voltage of the switching power supply; a first control signal is sent to the pulse width modulation circuit, and the duty ratio of the switching tube is adjusted to the maximum duty ratio; monitoring that the real-time output voltage of the soft start preprocessing circuit is increased to the target voltage through a voltage sampling circuit; and a second control signal is sent to the pulse width modulation circuit, and the duty ratio of the switching tube is adjusted from the maximum duty ratio to the target duty ratio, so that rapid soft start of the switching power supply is realized and a steady state is reached. According to the invention, the soft start time of the switching power supply can be obviously shortened, and the switching power supply can rapidly reach a stable working state after soft start.

The invention relates to the technical field of output control, in particular to a constant power control method, device and equipment based on COT and a storage medium, according to the method, fixed turn-on time is combined with dynamic turn-off time adjustment, the conciseness of COT control is reserved, accurate control over output power is achieved, and the control efficiency is improved. The influence of interference factors such as battery voltage drop and load abrupt change on constant power output can be effectively counteracted; specifically, a multi-path output synchronous opening design is adopted, and unified turn-off time adjustment logic is combined, namely, the turn-off time of a (k + 1) th period is calculated according to the total duration of a target period, so that an asynchronous turn-off condition caused by parameter differences of all channels is avoided, and the voltage rise deviation generated by load changes of a later turn-off channel is reduced; real-time output voltage and load resistance are respectively sampled in one period, battery voltage fluctuation and load change are monitored in real time, and error accumulation caused by the fact that a measured value in the current period is extended to the next period to be adjusted is avoided.

The invention relates to the technical field of amplifiers, in particular to a variable gain amplifier with a wide linear gain range and a working method, and the variable gain amplifier comprises the steps that a linear gain generation circuit receives a differential input signal and provides gain-adjustable differential output based on linear control voltage; the linear gain generation circuit comprises at least one stage of variable gain unit which comprises differential input pair transistors MN1 and MN2. The load resistor elements R1 and R2 are connected between the power supply voltage VDD and the drain electrodes of the differential input pair transistors MN1 and MN2; the tail current source MN3 provides bias current for the differential input pair transistors MN1 and MN2; the active load network is connected between the drain electrodes of the differential input pair transistors MN1 and MN2 and the ground; the active load network comprises a control tube MN8, the control tube MN8 works in a sub-threshold region, a grid electrode receives linear control voltage, equivalent impedance of the active load network is enabled to be in exponential change along with the linear control voltage through exponential I-V characteristics, and dB linear gain adjustment of the variable gain unit is achieved.

The invention provides a static frequency divider with adjustable self-resonant frequency and a clock circuit, and relates to the technical field of circuits, the frequency divider comprises a master latch and a slave latch; each of the master latch and the slave latch comprises a current source, an adjustable resistor unit, a differential amplification pair, a cross coupling pair and a load resistor pair; the current source is connected with the first current branch and the second current branch, the first current branch is connected with the load resistor pair through the differential amplification pair, the second current branch is connected with the load resistor pair through the cross coupling pair, the first current branch is provided with a first switching tube, and the second current branch is provided with a second switching tube and an adjustable resistor unit which are connected in series. Thus, the adjustable resistor unit is configured on the second current branch, association between the resistance value of the adjustable resistor unit and the frequency of the frequency divider is established, a hardware basis is provided for frequency adjustability, and frequency requirements of different scenes are met by adjusting the resistance value of the adjustable resistor unit and adjusting the self-resonant frequency of the frequency divider.

The application provides a constant current source circuit, which comprises a three-terminal adjustable voltage reference chip, an operational amplifier and a power supply end, a first resistor, an NMOS tube, a load resistor and a power supply ground end connected in series; the three-terminal adjustable voltage reference chip is connected with the power supply end and the operational amplifier; the NMOS tube comprises a D pole, an S pole and a G pole; the NMOS tube is connected with the first resistor through the D pole, connected with the load resistor through the S pole and connected with the output end of the operational amplifier through the G pole; the current flowing through the load resistor is controlled by controlling the voltage between the S pole and the G pole; and the constant control of the current flowing through the load resistor by the NMOS tube is realized. The constant current source circuit provided by the application not only does not generate common-mode voltage, but also improves the constant current source output current and the stability of the constant current source.

This invention discloses a method for optimizing the geometric parameters of a thermoelectric arm in a thermoelectric power generation system, relating to the field of thermoelectric power generation. The method includes: constructing a three-dimensional steady-state multiphysics coupled model of the thermoelectric power generation system; incorporating the height and cross-sectional area of ​​the thermoelectric arm as core geometric parameters to be optimized; and configuring the Seebeck coefficient, electrical conductivity, and thermal conductivity parameters corresponding to the thermoelectric material; setting boundary conditions for the model, including the target temperature at the hot end of the thermoelectric arm, the fluid velocity boundary corresponding to the cold end heat dissipation, and the system load resistance boundary, to ensure the model remains consistent with the actual working scenario. This invention improves model adaptation accuracy by constructing a multiphysics coupled model that fits the actual working conditions and dynamically adjusting material-related parameters. Combined with a parameterized scanning strategy with dynamic step sizes, it improves scanning efficiency while ensuring optimization effectiveness. The dual-objective optimization based on dynamic weights can flexibly adapt to different power supply requirements.

The application provides an ATE device source board channel parallel test system, which comprises a load unit, a VI source board and a plurality of measured load channels, the VI source board is connected with the plurality of measured load channels through signal ports, the load unit selects single-channel independent load or multi-channel parallel load according to a control signal, switches load resistance value according to the control signal, and outputs a load end current signal, a plurality of current-voltage conversion units, input ends of the plurality of current-voltage conversion units are connected with the plurality of measured load channels respectively, and the plurality of current-voltage conversion units are used for converting the load end current signal into a load end voltage signal, a multi-channel voltage measurement unit, the multi-channel voltage measurement unit selects one or more voltage signals according to a control signal, and outputs after conditioning the single-channel signal or performing summation operation on the multi-channel signal, and a control unit, the control unit outputs the control signal and receives measurement data from the multi-channel voltage measurement unit, and the control signal is used for controlling channel selection, load switching and measurement path selection.

Circuit arrangement (1), comprising: - N electrical energy sources (2a-c), each configured to provide electrical energy with a predetermined value of a physical quantity at a terminal (4a-c) of the energy source (2a-c) in a normal operating state; - a detection device (5) having an analog input (6) and an output (7) and configured to provide at the output (7) a detection signal (8) which depends on a voltage applied at the analog input (6); - a load resistor (11); - (N-1) resistors of the first kind (12a, b), wherein the first resistor of the first kind (12a) is connected to the load resistor (11) and the (N-1)th resistor of the first kind (12b) is connected to the analog input (6) of the detection device (5); - N resistors of the second kind (13a-c), wherein the first resistor of the second kind (13a) connects the terminal of the first power source (2a) to a first circuit node (14a) between the load resistor (11) and the first resistor of the first kind (12a), wherein the Nth resistor of the second kind (13c) has an Nth circuit node (14c) with the (N-1)th resistor of the first kind (12b) and is connected to the analog input (6); and - an evaluation device (17) which is designed to determine a fault operating state of at least one of the energy sources (2a-c).

A stall detection system is provided that determines if a glass slide in motion during an automated process is at risk for being damaged and stops motion in the event of an unacceptable risk of damage. The system includes one or more motors configured to move a glass slide (directly or indirectly). The motors are configured to generate a load resistance value. The system includes one or more processors that monitor the load resistance value of a motor during motion and compares the load resistance value to a predetermined threshold resistance value to determine the risk of a glass slide being damaged. The predetermined threshold resistance value may correspond to a risk of slide breakage in response to a force applied to any surface of the slide, or a risk of losing a controlling grip on a slide rack, or a risk of a motor skipping a motor step.

The utility model relates to the technical field of converters, in particular to a DAB converter adopting a bidirectional switch tap inductor, which comprises a primary side structure and a secondary side structure. The primary side structure comprises a direct current power supply Uin, an input capacitor Cin, a first power switch tube S1, a second power switch tube S2, a third power switch tube S3, a fourth power switch tube S4, a high-frequency inductor L, an excitation inductor Lm, a bidirectional switch tap inductor Lt and a transformer T; and the secondary side structure comprises a load resistor RL, an output capacitor Cout, a fifth power switch tube S5, a sixth power switch tube S6, a seventh power switch tube S7 and an eighth power switch tube S8. According to the converter, equivalent magnetization inductance is changed through bidirectional switch tap inductance, equivalent magnetization current is increased, zero-voltage switching-on is realized, switching loss is reduced, and the conversion efficiency is improved. When the input voltage and the output load are suddenly changed, good dynamic response capability is maintained, and zero-voltage switching operation is realized in a wide load and wide battery voltage change range.

The utility model relates to the technical field of brushless motor controllers, and discloses a controller load pressure detection system, which comprises a DC power supply, a controller to be detected, an instrument box, a motor dragging jig and a load resistance box, the instrument box, the motor dragging jig and the load resistance box are connected in sequence, and the DC power supply, the controller to be tested and the motor dragging jig are connected in sequence. A controller is connected to test equipment, the controller to be tested is started to enable an active motor (a brushless motor I) to start rotating, an operator operates a load resistance box according to an operation instruction to control the access of a load resistor, different loads are applied to a controller-motor system, and three indicating instruments of current, rotating speed and positive and negative rotation are observed to judge whether a product is qualified or not; and the instrument box, the motor dragging jig and the load resistance box of the detection system are integrated and independent from one another, so that the station movement of a production line and the replacement of the controller to be detected are facilitated, and the overall utilization rate of equipment is improved.

The invention discloses a load isolation type power supply module aging device and a design method thereof, and belongs to the field of aging tests. The clamp plate and the load plate are separately designed, and the clamp plate is in butt joint with the applicable load plate through the golden fingers, so that the flexibility of the matching plate is ensured, the design time and the purchase cost are reduced, and the test efficiency is improved. According to the invention, the influence of load resistor heating on the power module circuit is effectively reduced, and the accuracy and safety of module circuit test are guaranteed; aiming at the performance of a module circuit, compatibility design is carried out on different output paths of the same package, so that the burn-in test can be carried out by using the same board during single-path output or double-path output, and the reuse rate of the clamp board is improved. The load board simultaneously comprises a state monitoring module, has the functions of monitoring output voltage, alarming abnormity and storing, and ensures high reliability of the test.

The invention discloses an anti-parameter disturbance bidirectional converter non-linear control method and system, and the method comprises the following steps: building a three-order non-linear dynamic model of a three-phase voltage source converter, defining the reciprocal 1 / Rc of an AC side resistor R and a DC side load resistor in the non-linear dynamic model as an unknown parameter, and calculating the parameter disturbance of the three-order non-linear dynamic model; obtaining a system dynamic equation with parameter uncertainty of the three-phase voltage source converter; designing a state transformation function, linearizing a system dynamic equation, and mapping a state variable x; s30, a tracking error variable is defined as a difference value between the converted state variable and a reference track of the state variable, and the difference value is used for quantifying the deviation between the actual state and the expected state of the system; defining and designing a parameter updating law of the three estimated values, and calculating and updating unknown parameters on line according to the tracking error variable; and designing and calculating a control input law based on the tracking error variable and the three estimated values, and proving the asymptotic stability of the closed-loop system through a Lyapunov function.

The invention relates to the technical field of power supply circuits, and discloses a point-to-point high-voltage POC power supply circuit control method. According to the method, a power supply end and a power receiving end are included, the power supply end is connected with the power receiving end through a coaxial cable, and the power supply end is provided with a control logic device U1, a high-voltage power supply switch MOS1, a pulse detection switch MOS4, a graded pulse voltage detection resistor R1 and a power supply current and voltage detection resistor R2. The power receiving end is provided with an adjustable time interval pulse generation device U2, a pulse control circuit and a load resistor; a power supply link is established through a low-voltage pulse detection mechanism, a high-voltage power supply mode is switched after a power receiving end equipment type and power supply parameters are determined through negotiation, and overcurrent and overvoltage protection is realized at the same time. According to the application, the POC circuit power supply capability is increased, POC power supply protection is provided, the private protocol is added to negotiate and control the power supply power, and simple grading can be matched with various types of power equipment.

The present invention relates to the field of integrated circuit technology, and more particularly to an LVDS transmitter with slew control. The present invention utilizes the characteristics of resistor and capacitor delay to output a portion of the data signal output by the LVDS circuit after a delay controlled by slew control resistors (RD1 and RD2) and the parasitic capacitance of the gate of the switch tube (M3 and M4). This process absorbs the external load resistor R L The reflection of the output signal (OUTN and OUTP) is then controlled to control the voltage swing of the output signal. On the one hand, the introduction of the slew control circuit does not increase the extra power consumption of the circuit. On the other hand, the introduction of the slew control circuit can improve the ringing phenomenon of the signal at the inversion point. Secondly, due to the use of a much larger than R L RCM1 and RCM2 thus avoid increasing the current flowing through the internal matching resistor, thereby reducing the power consumption of the transmitter. Ultimately, the present invention solves the ringing phenomenon while reducing the power consumption of the LVDS transmitter.

To provide an epitaxial substrate in which a nitride semiconductor layer is formed on a Si substrate and in which both shortening of etching time and ensuring of the load resistance of a Si support substrate are achieved, and consequently both shortening of etching time and a reduction in warpage of an epitaxial wafer due to the stress of a heteroepitaxial film are achieved, and a method for producing the same.SOLUTION: An epitaxial substrate comprises a nitride semiconductor epitaxial layer on a main surface of a Si substrate, wherein a rear surface of the Si substrate has recesses in which a substrate thickness of a region other than an outer peripheral part is less than a substrate thickness of the outer peripheral part, a width of the outer peripheral part in a radial direction is 1 / 15 to 1 / 6 of a diameter of the Si substrate, an average thickness of the region other than the outer peripheral part is 1 / 3 to 1 / 2 of a thickness of the outer peripheral part, and a warpage of the epitaxial substrate is 50 μm or less.SELECTED DRAWING: Figure 1

This invention belongs to the field of random number generator technology, and relates to a true random number generator based on volatile memristors and a method for fabricating memristors. The method includes an entropy generation unit and a bit extraction unit. The entropy generation unit includes two or more volatile memristors connected in parallel, one end of which is connected to the input voltage, and the other end is connected in series with a load resistor and then grounded. The entropy generation unit exhibits spontaneous bistable switching behavior under high input voltage. The bit extraction unit includes a T flip-flop connected between the load resistor and the parallel volatile memristors, used to sample oscillation signals and generate a usable random bit stream. Its advantages are that it simplifies the circuit structure of the true random number generator, achieves a high random bit generation rate, and achieves extremely high energy efficiency.

The present invention provides a braking resistor system (10) for a vehicle, comprising at least one electronic unit (13) including an inverter (12), power electronics and / or a control unit, and a high-load resistor unit (11) electrically coupled to the electronic unit (13) and having a housing (16), wherein the electronic unit (13) and the high-load resistor unit (11) are arranged adjacent to each other and are electrically coupled via a phase-carrying busbar (23), and wherein a cooling device (14) is provided for the joint cooling of the high-load resistor unit (11) and the electronic unit (13), as well as a vehicle with such a braking resistor system (10).

This invention relates to a dual-loop converter for a linear-rotating switched reluctance generator and its control method. The drain of the positive switching transistor of each phase of the rotating generator unit is connected to a first positive circuit, and the source of the negative switching transistor of each phase of the rotating generator unit is connected to a first negative circuit. One end of a load resistor is connected to a first load circuit and a second load circuit connected in parallel, and the other end of the load resistor is connected to a third load circuit and a fourth load circuit connected in parallel. The cathode of the diode of each phase of the rotating generator unit is connected to the first load circuit, and the positive terminal of the winding of each phase of the rotating generator unit is directly connected to the third load circuit. The cathode of the diode of each phase of the DC generator unit is connected to the second load circuit, and the positive terminal of each phase of the DC generator unit is directly connected to the fourth load circuit. This invention solves the technical problems of existing converters using a large number of components and having high line current pressure.

This utility model relates to the field of resistor technology, specifically to a resistor tube with overlapping wiring, comprising an insulated support tube and a resistor strip spirally wound around the support tube. The resistor strip is an exposed metal strip, comprising integrally formed, continuously bent, alternately bent main body segments and connecting segments. The main body segments maintain a straight shape due to their own strength, while the connecting segments are arc-shaped. Adjacent main body segments are connected via the connecting segments and arranged in a V-shape. Multiple positioning grooves are formed on the outer side of the support tube, and the middle of each main body segment overlaps and is embedded in the positioning grooves. The elasticity of the connecting segments clamps adjacent main body segments tightly against the support tube. Compared with existing technologies, the resistor strip is directly exposed to air for heat dissipation, resulting in higher power density. It eliminates the need for the outer shell and magnesium oxide insulating powder of existing load resistor tubes, reducing the influencing factors of insulation and failure issues. It eliminates the need to consider the high-temperature insulation failure of magnesium oxide powder and problems caused by shell corrosion.

The application relates to the technical field of testing and application of power semiconductors, in particular to a SiC MOSFET gate oxide layer reliability testing device and method. The device is provided with a high-voltage direct-current voltage power supply, an auxiliary direct-current voltage source, a signal generating device, a half-bridge testing circuit, a gate driving circuit, a load inductor, a load resistor and a measuring device, can significantly shorten the stress time required for device reliability evaluation, can more accurately describe the device threshold voltage drift characteristics under different drain-source voltage stresses, compared with the traditional static bias and gate switching stress test method, effectively introduces the influence of dynamic drain-source voltage and current, improves the accuracy of the model test result, and has certain application value for SiC MOSFET gate oxide layer reliability evaluation.

The present invention discloses an autonomous coreless transformer and a refined design method thereof. The transformer comprises an autonomous voltage source, a circular winding bobbin, a primary winding, a secondary winding, a primary series compensation capacitor, a secondary series compensation capacitor, an uncontrolled rectifier module, an output filter capacitor, and a load resistor. The secondary winding is wound around the center of the circular winding bobbin, and the primary winding is evenly distributed on both sides of the secondary winding. Adjusting the number of turns and gap between the primary and secondary windings can control the transformer parameters. The present invention achieves refined design of the autonomous coreless transformer parameters by combining winding structure design with voltage deviation compensation.

The utility model discloses a kind of multi-path protection signal control circuit, belong to the technical field of automation equipment protection circuit.The circuit is input by several protection sensor signals, and each signal is connected to N channel MOS field effect transistor through input resistance and load resistance, and MOS tube is connected to triode after cascading, and triode output end connects motor driver I O port, and 24V is simultaneously stabilized as 5V for sensor power supply using 78L05.The utility model solves the problem of insufficient motor controller I O port resources, high cost and low reliability in prior art, can be flexibly configured according to sensor type, reduces cost and assembly difficulty, and improves system reliability.

This invention discloses a constant power control method and system for a wide-voltage adaptive garment steamer, comprising: real-time sampling to acquire the instantaneous value of the input voltage; real-time calculation of the effective value of the input voltage based on the latest sampling period; adjustment of the preset target power value and initial parameters of the load resistance; calculation of the theoretical target duty cycle required to maintain the target power based on the effective value of the input voltage; calculation of the absolute deviation between the target duty cycle and the currently operating actual duty cycle; and control of the PWM duty cycle to smoothly move to the theoretical target duty cycle in steps over several cycles. This invention avoids power surges caused by sudden and drastic changes in the duty cycle by setting a single variable step size and limiting the smooth movement to several cycles; and compensates for power attenuation caused by temperature drift by using dynamic resistors to readjust the execution duty cycle, ensuring that the heating element can still output rated heat and maintain the penetration of the steam jet even under prolonged high-temperature operation.

The invention discloses a cascade and cross-coupling bandwidth trans-impedance amplifier for visible light communication, which adopts a fully differential topological structure and consists of a cascade enhanced input stage, an active current source load and a cross-coupling bandwidth compensation network, an enhanced feedback loop is constructed in a multi-stage cascade mode; a multi-stage common-source amplifier is connected in series in a feedback path of an input end; replacing a traditional resistive load with a current source: replacing a common-gate load resistor with the current source; the differential output end of the circuit is connected with a pair of cross coupling transistors, and the grid electrodes and the drain electrodes of the transistors are connected in a cross mode to form a positive feedback mechanism. The invention provides a novel RGC-TIA structure adopting optimized bias and cascade feedback, and by breaking through voltage margin limitation, high gain, wide bandwidth and good linearity and common-mode rejection performance are realized at the same time.