1353 results about "Voltage ratio" patented technology

The invention belongs to the technical field of large-depth ground-to-air electromagnetic detection, and particularly relates to a light-weight high-power ground-to-air electromagnetic detection power supply system and method and a high-power vehicle-mounted power supply. Two paths of lithium battery units connected in parallel are adopted to provide short-time high-power emission current for a transmitter; the controller is used for acquiring a detection task set by the transmitter and setting a reference voltage according to the detection task; the voltage acquisition module is used for acquiring a direct-current bus voltage and comparing the direct-current bus voltage with a reference voltage to obtain a current modulation signal; and the controller is also used for acquiring the output current of each path of lithium battery unit and outputting a control signal according to the current modulation signal to compensate the output current of each path of lithium battery unit. According to the invention, the stability of a power supply system is realized when different instantaneous high-power outputs in a detection task in a high-power ground-air electromagnetic detection system are realized. When the output voltage and the sudden increase or decrease of the load current are adjusted as required, the stable output of the power supply voltage is realized.

The present disclosure provides a digital low-dropout regulator (DLDO) and an electronic device using the same. The DLDO includes a voltage comparator circuit, a switch control circuit, a power switch module, and an asynchronous clock generation circuit. The voltage comparator circuit compares a reference voltage with the output voltage to output a comparison result signal. The switch control circuit generates a switch control signal based on the comparison result signal. The power switch module is controlled by the switch control signal to switch between the on state and the off state, thereby adjusting the output voltage. The asynchronous clock generation circuit generates a reference clock signal that is asynchronous with the system clock signal used in the load circuit and has a higher clock frequency. This allows the switch control circuit to update the switch control signal based on the reference clock signal.

The invention discloses an intelligent silicon controlled rectifier voltage conversion circuit, which relates to the technical field of voltage conversion, and comprises a photovoltaic module, a micro-control module, a power regulation module, a first voltage threshold, a second voltage threshold, a second voltage threshold, a third voltage threshold, a fourth voltage threshold, a fifth voltage threshold and a sixth voltage threshold, when the converted electric energy is larger than a first voltage threshold value, the access control module transmits the electric energy output by power regulation, superposes the electric energy output by double-path electric energy coupling and stores the superposed electric energy by the energy storage module, and when the converted electric energy is smaller than the first voltage threshold value and larger than a second voltage threshold value, the access control module outputs the superposed electric energy. And when the voltage is smaller than a second voltage threshold value, electric energy coupling is stopped, the power regulation module is controlled to carry out power regulation on the electric energy released by the energy storage module, and power is supplied to the output module. According to the intelligent silicon controlled voltage conversion circuit, the utilization rate of photovoltaic electric energy can be improved, and the voltage gain and the power supply efficiency are improved.

Disclosed in the present invention are a current lookup table-based permanent magnet synchronous motor wide voltage range control method and a medium. The method comprises: by means of a full-speed domain current calibration method, obtaining a rotating speed-torque two-dimensional lookup table under a rated bus voltage; on the basis of the lookup table, multiplying a given rotating speed with a front-and-rear amplitude limiting voltage ratio to achieve wide voltage range control; and performing friction torque compensation and sampling delay compensation of a three-phase current at different rotating speeds. The present invention takes into account bus voltage fluctuation under the complex working condition of an electric vehicle, and multiplies the given rotating speed with a variable voltage coefficient ku to obtain an input rotating speed of an input current lookup table, such that precise current control of the permanent magnet synchronous motor under different bus voltage working conditions can be achieved, thereby avoiding the complex and tedious process of re-calibration of the current lookup table under different bus voltages; the present invention also takes into account friction torque compensation and phase current sampling delay compensation at different rotating speeds, wherein the friction torque compensation can be achieved by directly adding a friction torque error into a given torque signal in real time.

The invention relates to a method and device for confirming the number of battery packs in a battery system, the battery system, a computer readable storage medium and a computer program product. The method comprises the following steps: identifying a bus voltage of an accessed target battery system; the reference voltage of a single battery pack in the target battery system is obtained, and the reference voltage is the product of a preset static voltage corresponding to a single battery cell in the battery pack and the number of battery cells contained in the battery pack in the state of the lowest residual electric quantity; determining a voltage ratio of the bus voltage to the reference voltage; and rounding the voltage ratio to obtain the number of battery packs in the target battery system. According to the method, the total bus voltage of the static battery system is directly identified, and then the number of the stacked battery packs in the system is determined through the ratio of the bus voltage to the reference voltage, so that the identification of the number of the battery packs can be realized without charging processing, and the efficiency of the battery pack number identification processing process can be effectively improved.

The invention discloses a switching loss optimization control method and system of an energy storage DC converter. Comprising the following steps: firstly, acquiring battery side voltage / current and bus side voltage / current of the energy storage direct current converter; calculating according to the battery side voltage and the bus side voltage to obtain the voltage ratio of the two sides of the energy storage direct current converter; then, control power is obtained through calculation according to the battery side voltage / current and the bus side voltage / current; then, determining the working mode of the dual-active bridge circuit by using the control power of the energy storage direct-current converter; and finally, according to the working mode of the dual-active bridge circuit, the actual power of the dual-active bridge circuit is adjusted, and the switching loss optimization of the energy storage DC converter is completed. When the battery side voltage, the bus side voltage and the load power of the circuit are changed, the control power of the controller can be continuously changed, smooth transition is realized among all working modes, the output signal and the power gain are basically linear, and the dynamic response speed can be improved.

The invention discloses a photovoltaic inverter direct current component detection circuit, which relates to the technical field of photovoltaic detection, and comprises a photovoltaic inversion module used for photovoltaic conversion and inversion; the intelligent control module is used for signal receiving and module control; the detection control module is used for transmitting the input voltage and the output voltage of a switching element in the working of the upper half bridge or the lower half bridge of the photovoltaic inversion module; the first voltage drop module is used for calculating the voltage drop of an upper half-bridge switch element of the photovoltaic inversion module; the second voltage drop module is used for calculating the voltage drop of a lower half-bridge switch element of the photovoltaic inversion module; the voltage drop comparison module is used for voltage comparison; the output module is used for filtering and outputting electric energy; the component detection module is used for extracting the direct current signal and performing two-stage amplification; and the state judgment module is used for detecting positive and negative states of the direct current signal and carrying out voltage comparison. The photovoltaic inverter direct current component detection circuit can quickly and effectively detect the direct current component and automatically detect the generation reason of the direct current component.

The disclosure relates to an electronic circuit to verify the integrity of a switch. The circuit comprises a voltage comparator and decoupling switch. The decoupling switch configured receive the driving signal having a first logic value to enable the monitoring of the comparison voltage and is configured to receive the monitoring enable signal having a first logic value to command the opening of the decoupling switch. The electronic circuit is configured to generate the output monitoring signal having a first logic value in an event that the switch is an open circuit and having a second logic value in an event that the switch is a short circuit.

The present invention proposes a circuit and working method for realizing power supply monitoring with high efficiency and low power consumption, including a voltage divider circuit, a reference voltage source, a comparator, a high-speed power-on detection circuit, a NOR gate, a clock generation and shutdown circuit, a delay module and an output drive module. The voltage divider circuit is used to generate a reset threshold voltage that is proportional to the input voltage; the reference voltage source is used to generate a reference voltage that is independent of the power supply voltage and temperature; the comparator is used to compare the voltage after voltage division with the reference voltage; the high-speed power-on detection circuit is used to generate an on-chip reset signal of a power supply monitoring circuit with anti-interference capability; the clock generation and shutdown circuit is used to generate a clock signal of a delay unit and shut down a clock generation circuit; and the delay module is used for timing. It introduces a high-speed power-on detection circuit to avoid the reset failure problem caused by the comparator failing to flip in time or the power supply glitch interference, and at the same time introduces a clock shutdown circuit to effectively reduce power consumption.

The invention discloses a power supply intelligent management control system, and relates to the technical field of power supply management, and the system comprises a power supply processing module which is used for accessing and transmitting AC electric energy and carrying out voltage reduction, rectification filtering, inversion and transformation processing; the current sampling module is used for current sampling control, signal conversion and amplification filtering; the voltage comparison module is used for setting an overvoltage threshold value, comparing the overvoltage threshold value with the voltage and detecting the shunting degree; the power taking processing module is used for converting, amplifying and filtering the shunted sampling signals, and rectifying and storing the shunted sampling signals; the intelligent control module is used for signal receiving and module control; the electric energy adjusting module is used for adjusting voltage; and the output processing module is used for outputting filtering and electric energy superposition processing and supplying power to the output module. The intelligent management control system for the power supply can provide voltage stabilization and perform shunt power taking work and electric energy processing when a sampled signal is greater than a set threshold value, so that the safety of the system can be improved, and energy-saving power supply control can also be performed.

The invention relates to a CVT error evaluation method and device, error evaluation equipment and a storage medium, and belongs to the technical field of mutual inductor error recognized.The CVT error evaluation method comprises the steps that a first data set is restored to a primary voltage level based on voltage proportionality coefficients of multiple CVTs to obtain a second data set, and a difference matrix is constructed based on the second data set; establishing a likelihood function based on the difference matrix, and converting the likelihood function into a posterior probability density function based on a Bayesian formula; extracting data corresponding to a preset number of CVTs from the second data set to construct a third data set, and determining a prior probability density based on the third data set; and based on a multi-chain MCMC algorithm fused with plant rhizome growth and a posterior probability density function, determining error values corresponding to a plurality of CVTs when the posterior probability density is maximum. According to the method, the accuracy of CVT error evaluation is effectively ensured, and meanwhile, the error evaluation efficiency is also improved.

The invention discloses a regional power grid broadband oscillation risk assessment method based on electromagnetic transient equivalent simulation, which innovatively provides a stability assessment method for solving the problem of regional power grid broadband oscillation risk assessment, and is characterized in that a voltage ratio is directly used as an equivalent open-loop transfer function of a system to carry out stability assessment. According to the method, the complexity of stability evaluation is simplified, the evaluation process is more direct and efficient, and meanwhile, the actual dynamic characteristics of the system can be reflected more accurately, so that the accuracy of stability evaluation is improved.

A low voltage differential signaling receiver includes a resistor load pair, an input stage, a current mode logic stage and a comparator circuit. The input stage includes a P-type transistor pair and a N-type transistor pair. The P-type transistor pair and the N-type transistor pair are configured to generate first differential output voltages on the resistor load pair according to differential input signals. The current mode logic stage is configured to enhance a gain of the first differential output voltages into second differential output voltages. The latch circuit is configured to generate third differential output voltages according to the second differential output voltages and latch the third differential output voltages. The comparator circuit is configured to compare the third differential output voltages and generate a single-ended output signal.

The invention discloses a three-phase-shift control method and system of a DAB converter, and relates to the technical field of converter control. Comprising the steps that a primary side voltage steady-state value, a secondary side voltage steady-state value and an expected value X * of a high-frequency transformer Tr in a target DAB converter and a sampling value X fed back by the output end of the target DAB converter are acquired; performing proportional integral on a difference value between the sampling value X and the expected value X * to obtain unit transmission power Y; determining the voltage ratio # imgabs0 # of the two sides of the inductor, and determining a first phase shift angle D1, a second phase shift angle D2 and a third phase shift angle D3 according to the unit transmission power Y and the voltage ratio # imgabs1 # of the two sides of the inductor; and performing signal modulation through the first phase shift angle D1, the second phase shift angle D2, the third phase shift angle D3 and the switching frequency fs to obtain a driving signal to control the target DAB converter. Design and implementation of a control strategy are greatly simplified, and the control method is clear in mechanism and easy to control.

The invention discloses a mobile power supply with an intelligent electric energy management function, and relates to the technical field of mobile power supplies, and the mobile power supply comprises a photovoltaic detection control module which is used for photovoltaic conversion, voltage sampling and voltage comparison; the energy storage and discharge module is used for storing energy and discharging; the intelligent control module is used for signal receiving and module control; the coupling boosting module is used for power regulation, coupling regulation, rectification filtering and output voltage superposition work; the output control module is used for carrying out coupling adjustment and rectification filtering processing; the first output module is used for receiving the electric energy output by the output control module; and the second output module and the third output module are used for receiving the electric energy output by the coupling boosting module. The mobile power supply with the intelligent electric energy management function can provide multi-path power supply, the step-up ratio, the voltage gain and the power supply efficiency are improved, when only the first output module supplies power, power can be supplied to the energy storage discharging module through the coupling step-up module, and the utilization rate of electric energy is improved.

The invention relates to a dual active bridge converter control method, a controller and an energy storage power supply. The method comprises the following steps: determining a control strategy of the dual-active bridge converter according to a voltage ratio of a primary side to a secondary side of a transformer at a current moment and working parameters at the current moment in a working process of the dual-active bridge converter; executing a control strategy on the dual-active bridge converter; and if the working efficiency of the dual active bridge converter after the execution of the control strategy does not meet the preset condition, re-determining and executing a new control strategy of the dual active bridge converter until the working efficiency of the dual active bridge converter meets the preset condition. By adopting the method, the working efficiency of the DAB converter can be improved.

Systems and methods for capacitance tuning of devices in quantum processors are described. One implementation is a quantum processor with a first current path having a first loop, a Josephson structure with at least one Josephson junction interrupting the first loop, a second current path connected to the first current path, and a flux bias. The second current path has a first node spaced from a second node, a capacitor separating the first node and the second node, and a voltage gain tuner, the voltage gain tuner being inductively coupled to the inductance of the first current path. The flux bias is coupled to the voltage gain tuner and controls the voltage gain tuner to vary a voltage ratio between the first node and the second node, thereby influencing the capacitance of the first current path.

The invention provides a voltage-controlled oscillator and a phase-locked loop circuit, and relates to the technical field of integrated circuits. The voltage-controlled oscillator comprises a voltage-controlled circuit, a current copying circuit and an oscillating circuit, the voltage control circuit comprises a comparison unit, a switch unit and a voltage acquisition unit. A first input end of the comparison unit is used for receiving input control voltage, a second input end of the comparison unit is grounded through the voltage acquisition unit, an output end of the comparison unit is connected with a control end of the switch unit, one end of the switch unit is grounded through the voltage acquisition unit, and the other end of the switch unit is connected with an input end of the current copying circuit; the output end of the current copying circuit is connected with the input end of the oscillation circuit, and the output end of the oscillation circuit is used for outputting a control signal with target oscillation frequency. According to the voltage-controlled oscillator, the linearity of voltage control current is optimized, and meanwhile, the working voltage range of the voltage-controlled oscillator is expanded.

The invention discloses a photovoltaic direct current conversion method, a storage medium and computer equipment, and the method comprises the steps: obtaining the duty ratio of a first pulse width modulation signal through a voltage proportional-integral algorithm when an actual output voltage is adjusted to a preset target output voltage; through a maximum power point tracking control algorithm and the actual output power, obtaining a control output voltage when the photovoltaic power generation system works at the maximum photovoltaic power point and a duty ratio of a second pulse width modulation signal when the photovoltaic power generation system is adjusted to a preset target output voltage; based on the target pulse width modulation signal corresponding to the minimum duty ratio, the on-off states of the first switching device and the second switching device are controlled at the same time until the direct current of the preset target output voltage is obtained. By combining the maximum power point tracking control and the voltage proportional integral algorithm, the first switching device and the second switching device are controlled at the same time, the structure is simplified, and meanwhile direct current can be directly output.

The invention relates to the technical field of electric power measurement online monitoring. The invention discloses a CVT error calculation method and device based on a virtual standard algorithm and a storage medium, and the method comprises the steps: collecting the voltage original waveform data of a plurality of CVTs in a homologous state in real time, and calculating the amplitude and phase of the data; constructing a steady-state data set; calculating an initial virtual standard; calculating an initial voltage ratio difference value and an initial voltage angle difference value; inverting a real-time virtual standard; calculating an overall virtual standard; calculating an instantaneous voltage ratio difference value and an instantaneous voltage angle difference value; and outputting a CVT state judgment result. According to the method, the accuracy of CVT error calculation is effectively improved, the state of the mutual inductor can be more accurately judged, and a powerful guarantee is provided for stable operation of a power system.

The invention discloses a peak current and valley current controlled three-mode buck-boost converter, which comprises a power level circuit, an error amplifier, a slope compensation module, a current sampling module, a PWM (Pulse Width Modulation) comparator, a mode control module and a switching control module, and is characterized in that the power level circuit obtains an output voltage according to an input voltage and outputs a sampling voltage; the error amplifier outputs a control signal according to a comparison result of the sampling voltage and the reference voltage; the mode control module outputs different enable signals according to the states of the input voltage and the output voltage; the slope compensation module outputs different compensation voltages when the converter is in different modes; the current sampling module collects the voltage of peak current or valley current according to different modes; the PWM comparator generates a PWM control signal; the switching control module generates a driving signal according to the PWM control signal and different enable signals so as to switch different modes. The mode switching efficiency can be improved, the duty ratio can be reduced, and then output voltage ripples are reduced.

The embodiment of the invention provides a voltage comparison circuit and electronic equipment, and the circuit comprises a sampling voltage improvement module which collects a sampling voltage, amplifies the sampling voltage by a first preset multiple, and outputs a sampling amplification voltage to the first input end of each comparison module; the reference voltage increasing module is used for collecting the reference voltage, amplifying the reference voltage by a second preset multiple and then outputting the reference amplified voltage to the voltage dividing module; the voltage dividing module amplifies the reference amplified voltage according to a plurality of different third preset multiples to obtain a plurality of different target reference amplified voltages, and outputs each target reference amplified voltage to the second input end of the corresponding comparison module; and the comparison module outputs a level signal according to the sampling amplification voltage received by the first input end and the target reference amplification voltage received by the second input end. Therefore, the precision of the level signal output by the comparison module is higher, and the precision of the voltage range of the sampling voltage determined based on the level signal output by the comparison module is higher.

Controller and method for a switching power supply. For example, a controller for a switching power supply includes: a first terminal configured to receive a feedback voltage representing an output voltage associated with a secondary winding of the switching power supply; a second terminal configured to output a drive voltage to a first transistor associated with a primary winding coupled to the secondary winding of the switching power supply; a comparator configured to receive the feedback voltage and a predetermined feedback threshold and generate a comparison signal based at least in part on the feedback voltage and the predetermined feedback threshold; a pulse-width detector configured to detect a pulse width of the drive voltage during a first switching cycle, compare the detected pulse width with a predetermined time threshold, and generate a detection signal based at least in part on the detected pulse width and the predetermined time threshold.

The invention discloses an inverter turn-off protection circuit, which comprises a bus voltage sampling circuit, a current sampling module, a multiplier, a threshold voltage comparison circuit and a gate turn-off circuit, and is characterized in that the bus voltage sampling circuit is used for sampling an inverter bus voltage to obtain a sampling voltage; the current sampling module is used for sampling phase current output by the alternating current side of the inverter to obtain sampling current; the multiplier is used for receiving the sampling voltage and the sampling current and carrying out multiplication operation to obtain instantaneous power; the threshold voltage comparison circuit is used for comparing the instantaneous power with a threshold to obtain a level signal; and the gate pole turn-off circuit is used for controlling the turn-off of a gate pole turn-off switch tube according to the level signal output by the threshold voltage comparison circuit so as to control the turn-off of a power tube of the inverter. The inverter turn-off protection circuit operates independently, is not affected by an MCU system, is low in cost and high in response speed, and greatly improves function safety.

The present application discloses an electrostatic chuck power circuit current detection apparatus, and a semiconductor process device. The apparatus comprises: a sampling resistor (R), the sampling resistor (R) being connected in series to an output end of an electrostatic chuck power supply (10); an operational amplifier (12), a positive input end of the operational amplifier (12) being connected to an input end of the sampling resistor (R), a negative input end of the operational amplifier (12) being connected to an output end of the sampling resistor (R), a reference potential end of the operational amplifier (R) being used to input a first reference voltage (VDD1-), an absolute voltage difference between the first reference voltage (VDD1-) and an output voltage (HV+) of the output end of the electrostatic chuck power supply (10) being less than a withstand voltage difference of the operational amplifier (12), a power supply end of the operational amplifier (12) being used to input a first supply voltage (VDD1+), the first supply voltage (VDD1+) being higher than the first reference voltage (VDD1-) by a preset first voltage value, and an output end of the operational amplifier (12) being used to output a voltage signal proportional to a circuit current. The present application uses a non-high-voltage isolated ordinary operational amplifier, which reduces costs and improves the accuracy of current detection.

The invention discloses a fault detector of an accelerator switch assembly and a detection method thereof. The fault detector comprises at least one detection circuit. Each detection circuit comprises three constant current sources with equal output current, a first resistor and two voltage comparators; the input ends of the three constant current sources are used for inputting reference current; the output end of the first constant current source and the output end of the second constant current source are used for being connected with a normally-closed contact and a normally-open contact of an electric switch to be tested respectively, and the output end of the third constant current source is grounded through a first resistor. The common contact of the to-be-tested switch is grounded. Two input ends of the first voltage comparator are respectively connected with the output end of the first constant current source and the output end of the third constant current source; two input ends of the second voltage comparator are respectively connected with the output end of the second constant current source and the output end of the third constant current source; the output ends of the first voltage comparator and the second voltage comparator are used for outputting detection signals. According to the scheme, the detection efficiency and the detection precision of fault detection of the accelerator switch assembly can be greatly improved.

The invention provides an output negative voltage protection circuit applied to an N-type power device linear voltage regulator. The output negative voltage protection circuit comprises a voltage comparator, a current comparator, an error amplifier, a buffer driver, a power device MP, a resistor R1, a resistor R2, a resistor Rload and a capacitor Cout. The method comprises the following steps: acquiring a voltage difference between an S-pole output voltage Vout of a power device MP and a reference voltage Vos through a voltage comparator, converting the voltage difference into a current signal Ieg, and comparing the current signal Ieg with a reference current Ios through a current comparator to generate a current signal Ilim; adjusting the output of an error amplifier according to the current signal Ilim, and dynamically adjusting the G pole voltage Vgate of the power device MP; when the output voltage Vout is lower than the reference voltage Vos, the G pole voltage Vgate is pulled down to turn off the power device MP through the current signal Ilim, and protection of the power device MP is achieved.

To provide a current detection circuit capable of applying a hysteresis to a comparing action of an abnormal detection comparator whose object of detection is a current.SOLUTION: A current detection circuit includes a current-to-voltage conversion element that converts an object-of-detection current to a voltage, a comparator that inputs a detection voltage, which results from the conversion, through one of input terminals and inputs a comparison reference voltage through the other input terminal, and a hysteresis application circuit that applies a hysteresis to a comparing action of the comparator. The hysteresis application circuit includes a current source circuit that generates a current of a predetermined magnitude which is added to or subtracted from the current that is an object of detection, and a switch element connected in series with the current source circuit. When the switch element is turned on or off with an output of the comparator, a current flowing into the current-to-voltage conversion element augments or diminishes. Accordingly, the detection voltage varies relatively to the comparison reference voltage. Thus, a hysteresis is applied to the comparing action of the comparator.SELECTED DRAWING: Figure 1

The invention relates to the technical field of intelligent power grid characteristic current communication, and discloses an over-temperature protection circuit, which is connected with a characteristic current generation circuit and a controller, and comprises a temperature acquisition module which is arranged in a preset range of a field effect transistor and generates structural change according to the temperature change of the field effect transistor, a detection voltage signal is output based on a voltage drop signal formed by the structure change; the voltage comparison module is connected with the temperature acquisition module, receives the detection voltage signal, and outputs a turn-off control signal when detecting that the detection voltage signal is smaller than a preset voltage signal; and the switch control module is respectively connected with the voltage comparison module and the controller, and is closed after receiving the turn-off control signal so as to stop transmitting the pulse width modulation signal sent by the controller to the characteristic current generation circuit, so that the field effect transistor stops working. The problem that the detection cost is high through a thermistor is solved.

The embodiment of the invention provides a tuning voltage calibration device, a phase-locked loop and a tuning voltage calibration method, the device comprises a voltage comparison module and a calibration module, the output end of the voltage comparison module is connected with the input end of the calibration module, the voltage comparison module is connected with the phase-locked loop, and the phase-locked loop is connected with the calibration module. The comparator is used for comparing a reference voltage with a preset value with a tuning voltage in a phase-locked loop through a hysteresis comparator to generate an error signal; and the calibration module is used for determining the calibration direction of the tuning voltage according to the error signal, calibrating the tuning voltage based on the calibration direction, and stopping calibration of the tuning voltage under the condition that the error signal is continuously overturned. According to the embodiment of the invention, one hysteresis comparator is adopted, the implementation mode is simpler, the controllable range of the tuning voltage is enlarged, calibration is stopped when the tuning voltage is stable, power consumption generated by continuous calibration is avoided, and the problems that the tuning voltage range of double comparators is limited and continuous power consumption overhead exists in the prior art can be solved.