211 results about "Load resistance" patented technology

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 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).

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 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.

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 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.

The invention relates to an artificial cochlea main electrode electrical performance test device. The device comprises a flexible test pen (1); the first multi-throw change-over switch (2) is respectively connected with each electrode ring (4) of the artificial cochlea main electrode (3) to be tested; the load resistance circuit is respectively connected with the first multi-throw change-over switch (2) and a power supply; and the conversion and display circuit is connected with the load resistance circuit and enables the flexible test pen (1) to be in contact with an electrode ring to be tested in the test process, the power supply, the load resistance circuit, the first multi-throw change-over switch (2), the flexible test pen (1), the electrode ring to be tested and the conversion and display circuit form a loop, and a test result is displayed on the conversion and display circuit. Compared with the prior art, the device has the advantages of convenience in testing, low damage probability of the electrode ring, convenience in load resistor switching and the like.

The present disclosure provides a charging and discharging test device, wherein the charging and discharging test device comprises a first interface, a second interface and a third interface, the first interface is connected with a power adapter, the second interface is connected with a load resistance, and the third interface is connected with a device under test; an interface switching module is used for controlling the charging and discharging test device to switch between the first interface and the second interface, wherein when the device under test is subjected to a charging test, the charging and discharging test device is switched to the first interface; when the device under test is subjected to a discharging test, the charging and discharging test device is switched to the second interface; and a data acquisition module is used for acquiring test data of the device under test in the charging test or the discharging test, and the test data is used for judging whether the device under test is normal.

The utility model discloses a high-voltage switching-on and switching-off device for an insulation voltage-withstanding dielectric strength test, and the device comprises a rotating disc which is rotatably arranged; the metal guide rod is arranged on the turntable and rotates along with the turntable, and contact terminals are arranged at the two ends of the metal guide rod; a first high-voltage positive input terminal and a first high-voltage negative input terminal, wherein a first high-voltage load resistance network is arranged between the first high-voltage positive input terminal and the first high-voltage negative input terminal; and a second high-voltage positive input terminal and a second high-voltage negative input terminal, and a second high-voltage load resistance network is arranged between the second high-voltage positive input terminal and the second high-voltage negative input terminal. According to the utility model, the appropriate resistance load network can be selected according to the input voltage to rapidly divide and adapt the load, and the flexibility, accuracy and safety of the insulation voltage-withstanding dielectric strength test are improved.

The invention relates to the technical field of automatic control, and discloses a non-singular sliding mode control method and device for a Buck converter, and the method comprises the steps: building a disturbance-based average state equation according to the topological structure and external disturbance conditions of the Buck converter, and enabling the disturbance to comprise load resistance disturbance and input voltage disturbance; an error variable is determined according to the average state equation, a sliding mode controller is constructed according to the error variable, and the sliding mode controller is constructed based on the fractional order exponential reaching law; determining an extended state observer according to the average state equation; and estimating the state and disturbance of the Buck converter according to the extended state observer, and compensating the sliding mode controller according to the state and disturbance estimation condition of the Buck converter.

The invention discloses a resonant low-temperature liquid level sensor detection system, and belongs to the technical field of low-temperature liquid level detection. The system is mainly formed by sequentially connecting a frequency sweep power supply module, a power amplification detection module, a series resonance network and an output detection device. According to the working principle, broadband excitation is provided through the sweep frequency power supply module, and after signal amplification, isolation and impedance matching are conducted through the power amplification module, a series resonance network composed of the tunable element, the liquid level sensitive element and the load resistor is driven. The output detection device adopts a vector network analysis technology, extracts signals through a directional coupler, and comprehensively analyzes multiple parameters to accurately calculate the liquid level height. Liquid level detection is converted into frequency domain measurement, the precision, stability and full-scale performance of low-temperature liquid level measurement are remarkably improved, and the device is particularly suitable for storage tank liquid level monitoring of low-temperature media such as liquid nitrogen.

The invention discloses a coupling inductor interleaved control high-voltage-reduction direct-current converter and a control method thereof. The converter comprises a direct-current input power supply, two power switch tubes, two diodes, a coupling inductor, a flying capacitor, an output capacitor and a load resistor, wherein the coupling inductor is composed of two tightly-coupled inductors with the same winding direction; zero-voltage turn-on and zero-current turn-off of a power device can be realized without additionally designing an auxiliary circuit, the soft switching capability is realized, the switching loss is reduced, and the efficiency is improved; meanwhile, current sharing can be automatically achieved without additionally designing a current sharing control strategy, the power device bears small voltage stress, element parameter type selection is facilitated, and miniaturization and light weight of the converter are facilitated. The control method comprises the steps of detecting input and output voltage, calculating a duty ratio, judging a working interval, generating a PWM signal, driving a power switch tube and monitoring and adjusting in real time, and high step-down ratio, low output voltage ripple and output current ripple are realized by adopting an interleaving control technology and a magnetic coupling technology.

The application relates to a load-adjustable direct-current single-wire power taking protection device, which comprises a main circuit module, a driving module and a protection module connected electrically, the main circuit module comprises a transformer T1 and a transformer T2, is used for generating a direct-current auxiliary power supply to supply power for the driving module, further comprises a field effect tube V1, a field effect tube V2, a gate-source resistor R1, a gate-source resistor R2, a sampling resistor R0 and a load resistor RL, the driving module adopts an integrated circuit D1, the integrated circuit D1 is provided with multiple non-gates to constitute an oscillator, outputs driving signals with different waveforms, drives the field effect tube V1 and the field effect tube V2 to be turned on or turned off, and the capacitor C7 in the protection module is charged by a voltage reference source N2. The single-wire works, outputs two-way driving signals with high level short-time overlapping complements through the oscillator, controls the on-off of the two field effect tubes, implements the "belch type" protection when a fault occurs, and restores the power supply after the fault is eliminated.

The invention discloses an F-type high-power rectifying circuit based on admittance matching, and belongs to the field of microwave wireless energy transmission. The circuit comprises a dielectric substrate, an upper surface circuit structure and a grounding metal floor, wherein the upper surface circuit structure comprises a three-stage F-class harmonic network, an admittance matching structure, a direct current filtering structure, a 50-ohm bonding pad, a metal floor, a Schottky diode, a blocking capacitor, a load resistor and a grounding via hole. A novel three-level F-type harmonic network is adopted, the network can not only perform impedance control on second and third harmonics, but also perform impedance control on fourth harmonics, and the more multi-level harmonic control network can reduce the diode loss and further improve the rectification efficiency; in addition, a new technology based on admittance matching is adopted, impedance is converted into admittance, so that admittance of the parallel circuit can be directly added, the matching complexity of the parallel circuit can be reduced by matching the admittance, and the matching intuition is improved.

A high-voltage Gaussian pulse generation circuit based on avalanche transistors comprises N Marx circuits which are connected in parallel, and each Marx circuit comprises an avalanche transistor, an energy storage capacitor and a charging resistor which are alternately connected in series; the waveform adjusting inductor L is connected between the output end of the parallel Marx circuit and the load resistor RL and is used for adjusting the waveform; the gate driving chip is connected to the collector electrode and the base electrode of the first-stage avalanche transistor of the Marx circuit and used for triggering synchronous conduction of the avalanche transistor; a 300V power supply VDC charges the four Marx circuits through a charging resistor, after charging, pulses generated by a gate driving chip enter the four Marx circuits, first-stage avalanche transistors of the four Marx circuits are made to be simultaneously subjected to avalanche conduction, and the avalanche transistors of all stages are conducted stage by stage due to the fact that the voltage borne by the avalanche transistors is increased; after the avalanche of each transistor is conducted, the four marx circuits are connected in parallel to release energy to a load through a waveform adjusting inductor, and a required waveform is formed on the load; the device has the characteristics of convenient design, simple structure, stability and reliability.

A preamplifier includes an operational transconductance amplifier, a first-type metal-oxide-semiconductor (MOS) transistor have a gate electrically coupled to the OTA output; a first second-type MOS transistor; a second second-type MOS transistor electrically connected in parallel with the first second-type MOS transistor; a first load resistor electrically connected in series with a drain of the first second-type MOS transistor that has a first output voltage; a second load resistor electrically connected in series with a drain of the second second-type MOS transistor that has a second output voltage; a tail node electrically connected to a source of the first second-type MOS transistor, a source of the second second-type MOS transistor, and a drain of a third second-type MOS transistor; a common-mode feedback circuit electrically coupled to the first and second output voltages and to a first OTA input; and a reference voltage electrically coupled to a second OTA input.

The concept according to the invention proposes a generator (11) for powering various instruments (35, 44), which provides a desired output characteristic curve without the aid of a control loop. For this purpose, it uses a reactance network (19) which itself has a desired characteristic curve (i.e., intrinsic). This is accomplished by providing various selectable composite resistances in the output branches of the generator (11), which provides different relationships between the output power and the load resistance.