90 results about "Switching frequency control" patented technology

The present application relates to the technical field of inverter control, and relates to a control method for a microinverter and a related device therefor. A specific embodiment of the method comprises: acquiring a maximum power value of a photovoltaic module and a phase angle corresponding to a power grid current in an alternating current power grid, and, on the basis of the maximum power value and the phase angle, determining a target output current; and acquiring a mains frequency current corresponding to an output end of the microinverter, determining a current difference value between the target output current and the mains frequency current, on the basis of the current difference value, determining a target switching frequency corresponding to a plurality of switch tubes in the microinverter, and, by means of the target switching frequency, controlling the turning on and turning off of the plurality of switch tubes in the microinverter, so as to implement the transmission of a current to the alternating current power grid. According to the embodiment, the wave driving control of a microinverter based on a one-stage power conversion topology is achieved, which increases the efficiency and power of the microinverter, reduces the costs of the microinverter, and improves the control effect of the microinverter.

The invention relates to a permanent magnet synchronous motor current control method of an adjustable switching frequency FCS-MPC. Compared with the prior art, the defect that the switching frequency of an inverter is not fixed in current control of an existing FCS-MPC permanent magnet synchronous motor system is overcome. The method comprises the following steps: acquiring data of a driving system; constructing a discrete current prediction control model; determining a cost function and a delay compensation strategy; calculating a current error control band degree; selecting an optimal voltage vector; and outputting the voltage vector. According to the invention, the unique advantages of the FCS-MPC are reserved, and the defect that the inherent switching frequency is not fixed is overcome, so that the FCS-MPC can operate under the specified switching frequency in a wide speed regulation range; by introducing the PI type switching frequency controller, the zero-static-error tracking of the switching frequency reference value can be realized, and the control method realizes the effective regulation and control of the switching frequency on the basis of ensuring the current control performance of the permanent magnet motor.

The invention relates to the technical field of power electronic conversion, and discloses a high-efficiency rectification conversion system and a control method thereof, and the system comprises the following modules: a detection module, an input compatible module, a hybrid power device module, a control module, a thermal management module and a frequency modulation module. The control method comprises the following steps: acquiring input power grid voltage, output current and load state parameters; calculating an input voltage phase difference; dynamically selecting the type and channel configuration of the silicon carbide or gallium nitride power device according to the load rate; outputting a device configuration instruction and a switching frequency control instruction; adjusting the cooling system through the evaluated thermal state of the conversion system; and the control module receives the control instruction output by the control module and is used for implementing a corresponding pulse width modulation strategy. According to the method, a multi-system power grid identification and self-adaptive topology switching strategy is adopted, the technical effect of automatically configuring the optimal rectification architecture under different input types is achieved, and the problems of response delay and poor compatibility of the method in the environment of variable power grid types are solved.

The invention relates to the technical field of motor systems, in particular to a synchronous motor driving system analysis method and device, and can solve the problems that an existing method relates to an optimization process, so that the calculated amount is generally large, the requirement for a processor is high, and part of technologies need to identify motor electromagnetic parameters, so that the cost is low to a certain extent. And the requirement of the control strategy on the computing power is increased. The method comprises the following steps: constructing a motor system coupling model; analyzing the loss of the motor system based on the coupling model; calculating the loss of the motor system under different switching frequencies according to the loss analysis of the motor system; selecting a series of working condition points, and respectively simulating and acquiring the operation efficiency of the motor and the inverter under the control of different switching frequencies; according to the motor efficiency and the inverter efficiency, the overall efficiency of the motor driving system is calculated, and the switching frequency value when the efficiency of the motor driving system is the highest on each working condition point is obtained, namely, the optimal switching frequency corresponding to the working condition point is obtained.

The invention discloses an LLC converter output voltage optimization method and device based on active disturbance rejection control. The method comprises the following steps: inputting an observed output voltage of a resonant converter to an extended state observer; inputting the reference output voltage into a tracking differentiator, outputting a smooth voltage tracking signal and a voltage change rate estimation value by the tracking differentiator, and subtracting from the output of the extended state observer to obtain a first error signal and a second error signal; inputting the first error signal and the second error signal into a nonlinear state error feedback controller, and outputting an error integral signal by the nonlinear state error feedback controller; subtracting the error integral signal and the output of the extended state observer, and dividing the difference by a stability coefficient to obtain a switching frequency control quantity; parameters in the extended state observer and the nonlinear state error feedback controller and a stability coefficient are obtained through a multi-objective optimization algorithm. By adopting the technical scheme, the anti-disturbance capability of the LLC resonant converter is effectively improved.

The invention discloses a switched capacitor module, a voltage conversion circuit and electronic equipment, which are used for improving dynamic performance and response rate. The switched capacitor module comprises Q switched capacitor modules, the input ends of the Q switched capacitor modules are connected in parallel to serve as the input end of the switched capacitor module, and the output ends of the Q switched capacitor modules are connected in parallel to serve as the output end of the switched capacitor module. Moreover, the switched capacitor module comprises N switched capacitor circuits, the input ends of the N switched capacitor circuits are connected with the input end of the switched capacitor module, and the output ends of the N switched capacitor circuits are connected with the output end of the switched capacitor module. And the output end of the switched capacitor module is used for being connected with a load. The switched capacitor circuit is controlled to work based on the switching frequency, the dynamic performance and the response rate can be improved, the output capacitance in the switched capacitor circuit can be reduced, and therefore cost is saved, the area of a single board is reduced, and the size of a product is reduced.

The invention discloses a CLLC resonant converter soft start method based on edge neural network prediction. The method comprises the following steps: firstly, acquiring soft start process data of a circuit under different conditions by using a voltage and current sensor; secondly, constructing an LSTM network to obtain a CLLC circuit model predictor; and taking the process data at the current moment as input, and outputting an output voltage value and a resonance current peak value of the next period to obtain a real optimal switching frequency value. And then a real-time lightweight network is established as an optimal switching frequency controller, a load coefficient, a voltage gain and a resonant current peak value are taken as lightweight network input, and a predicted optimal switching frequency value is output. And finally, combining the optimal switching frequency controller with a PI controller to realize smooth soft start of the CLLC resonant converter. According to the invention, under the conditions of dynamic load and low storage cost, a fast soft starting method with low peak current is realized.

A power supply system including a housing, an internal non-removable battery, an output, a power converter, and an electronic processor. The internal non-removable battery received in the housing and having a nominal voltage of at least 12 Volts. The output provided on the housing. The power converter coupled between the internal non-removable battery and the output. The power converter including a first switch. The power converter also converts power received from the internal non-removable battery. The electronic processor coupled to the power converter and controls operation of the power converter by controlling the first switch at a switching frequency of at least 100 kHz.

The invention discloses a trapezoidal wave current soft switching method of an interleaving DC-DC converter, which is used for a two-phase interleaving bidirectional DC-DC converter based on a coupling inductor and a multi-phase interleaving converter thereof, and is characterized in that an inductive current adopts a trapezoidal wave mode, so that the converter works in an approximate critical conduction mode; a fixed switching frequency control or hybrid control method is adopted, so that the device can work in a Buck mode and can also work in a Boost mode. The method for realizing the soft switching is characterized in that the parasitic capacitance or the external resonant capacitor of the switching tube is discharged to be zero under the resonance action of the inductor and the capacitor in the dead zone time when the upper bridge arm switch and the lower bridge arm switch are alternately switched on, so that the zero-voltage switching-on of all the switching tubes is realized. And each phase current sharing control is adopted in the multi-phase interleaving parallel topological structure. According to the invention, the problems of large current peak value and high turn-off loss of a traditional triangular wave current mode are solved, the output ripple current is reduced, a soft switching method is provided, the switching loss is reduced, and the conversion efficiency of the converter is improved.

The invention provides a control method and a control device of a DAB converter. The method comprises the following steps: acquiring a relation curve of switching tube turn-off loss and switching frequency of the DAB converter, a relation curve of switching tube on-state loss and switching frequency, a relation curve of transformer magnetic core loss and switching frequency and a relation curve of transformer coil loss and switching frequency; acquiring the change trend of the comprehensive loss and the switching frequency of the DAB converter according to the relation curve; searching the optimal switching frequency of the DAB converter according to the change trend; and controlling the operation of the DAB converter according to the optimal switching frequency. According to the method, the comprehensive loss is obtained through the single loss curve of the DAB converter, and the optimal switching frequency is searched according to the change trend of the comprehensive loss, so that the DAB converter operates in the optimal state, the overall efficiency of the DAB converter is improved, and particularly, the efficiency is improved in a light load state.

This invention relates to a thermal control method for grid-connected converters that balances low harmonics and junction temperature limitations, belonging to the field of intelligent power electronics control. It employs a DPWM modulation method that locks the optimal clamping interval under overload conditions and couples this method with switching frequency control. Offline simulation is used to scan the switching frequency, obtaining data on the peak junction temperature and grid current variations as a function of the switching frequency, which is then stored in a lookup table accessible to the controller. During operation, feasible switching frequency ranges are selected based on junction temperature and dual constraints, and a recommended switching frequency range is provided. Within the acceptable frequency range, the optimal frequency reduction point is selected according to a proposed selection function, thus achieving a dynamic trade-off between thermal safety and system performance during overload. This invention, by fully considering the coupling effect of DPWM and frequency reduction, provides the optimal operating frequency point to ensure the safe and compliant operation of the converter under overload conditions.

The invention relates to the technical field of power electronic control, and discloses a switching frequency control method for an isolated resonant converter and a storage medium, and the method comprises the steps: continuously monitoring the real-time load current of the isolated resonant converter under a load condition; when it is monitored that the maintenance duration of the real-time load current continuously meeting the current operation condition reaches the preset duration, the switching frequency minimum value of the isolated resonant converter is obtained, and according to the size relation between the preset switching frequency and the switching frequency minimum value, the direct-current bus voltage is adjusted in real time, so that the current operation condition of the isolated resonant converter is obtained. The switching frequency minimum value does not exceed the preset switching frequency; wherein the current operation condition is that the real-time load current is greater than or equal to a preset current threshold value. According to the invention, the minimum value of the switching frequency is adjusted by adjusting the voltage of the direct-current bus, so that the device works at the optimal frequency, the EMI of the product is reduced, the size of the magnetic device does not need to be increased specially, the device cost can be remarkably reduced, and the power density of the product is improved.

The invention provides an asymmetric modulation method and device for a bidirectional resonant DAB converter, and the method comprises the steps: determining the real-time duty ratio of any switching tube in a primary full bridge through the real-time working parameters of the bidirectional resonant DAB converter, and determining the real-time switching frequencies of a switching tube corresponding to the primary full bridge and a switching tube corresponding to a secondary full bridge, and enabling the real-time duty ratio of other switching tubes located on the same bridge arm with any switching tube to be complementary with the real-time duty ratio of any switching tube, thereby obtaining the real-time duty ratio of any switching tube according to the real-time duty ratio of the switching tube of the primary full bridge, the real-time duty ratio of the switching tube of the secondary full bridge and the real-time switching frequency. And controlling the switching states of a switching tube corresponding to the primary side full bridge and a switching tube corresponding to the secondary side full bridge, and asymmetrically modulating the bidirectional resonant DAB converter, thereby realizing the asymmetrical control of the positive high level duration and the negative high level duration of the midpoint voltage of the bridge arm of the primary side full bridge, and optimizing the reactive power.

The invention discloses a switching frequency control method and a switching frequency control system for a four-quadrant rectifier. The control method comprises the following steps: acquiring an operation condition and a contact network voltage of an electric locomotive; decomposing the overhead line system voltage according to the frequency to obtain a harmonic parameter of the overhead line system voltage; determining the harmonic state of the contact network according to the harmonic parameter of the voltage of the contact network; and adjusting the switching frequency of the four-quadrant rectifier to a target frequency according to the operation condition of the electric locomotive, or adjusting the switching frequency of the four-quadrant rectifier to the target frequency according to the operation condition of the electric locomotive and the harmonic state of the contact network. The switching frequency control method of the four-quadrant rectifier provided by the invention can adapt to the operation condition of a motor locomotive and the dynamic change of the harmonic state of a contact network, and is relatively high in adaptability.

The invention relates to the technical field of LLC resonant converters, in particular to an LLC resonant converter control method and system based on output diode current detection, and the method comprises the steps: conditioning the output current of an LLC resonant converter; designing a control outer ring, and calculating an error signal of the reference current and the diode conditioning current; the stability of the output current is maintained by using the offset and adjusting the integral slope; the compensation amount of the offset is adjusted, and the offset and the integral slope are given to the control inner ring, so that the control inner ring works in the optimal working interval; the control inner ring detects the conditioning current, integrates the conditioning current, compares the integral conditioning current with the error signals of the reference current and the offset, and outputs the switching frequency; and a switching tube of the converter is controlled by using the switching frequency to control the output current, so that the converter enters a new steady state. The problems that an existing control method of the converter cannot meet the requirements of small input filter capacitance, output voltage ripple suppression, input disturbance resistance and the like at the same time are solved.

The invention provides a power conversion device and a conversion method thereof. The power conversion device comprises a transformer circuit and a bridge rectifier switching circuit coupled with an input side circuit of the transformer circuit, and the switching frequency control circuit generates compensation frequency according to input voltage of the bridge rectifier switching circuit and adjusts switching frequency of the bridge rectifier switching circuit according to the compensation frequency.

An apparatus includes a logic circuit having a clock input, a first logic circuit control output, and a second logic circuit control output. A clock generation circuit has a first clock control input, a second clock control input, and a clock output. The clock output is coupled to the clock input. An off-timer circuit has an off-timer output. A comparator has a comparator output. An out-of-audio (OOA) circuit has a first OOA input, a second OOA input, a third OOA input, a first OOA output, and a second OOA output. The first OOA input is coupled to the comparator output. The second OOA input is coupled to the clock output. The third OOA input is coupled to the off-timer output. The first OOA output is coupled to the first clock control input. The second OOA output is coupled to the second clock control input.

The invention relates to a network construction type converter thermal control method considering low harmonic waves and junction temperature limitation, which belongs to the field of power electronic intelligent control, and comprises the following steps: locking a DPWM modulation mode of an optimal clamping interval under an overload condition, and carrying out coupling design with switching frequency control; switching frequency is scanned through off-line simulation, data of device peak junction temperature and grid-connected current changing along with the switching frequency are obtained respectively, and the data are solidified into a lookup table capable of being called by a controller; during operation, a feasible switching frequency interval is screened according to junction temperature and double constraints, a recommended switching frequency interval is given, and an optimal frequency reduction working point is selected according to a provided selection function in the frequency interval meeting requirements, so that dynamic compromise between thermal safety and system performance during overload is realized. According to the method, the optimal operation frequency point is given under the condition of fully considering the DPWM and frequency reduction coupling effect, so that the safe and compliant operation of the converter under the overload working condition is realized.

The utility model discloses an LED abnormity monitoring control circuit and a monitoring controller, the LED abnormity monitoring control circuit comprises a power supply management circuit which comprises a positive connection end and a negative connection end, an LED lamp group is electrically connected between the positive connection end and the negative connection end, a sampling control unit is electrically connected with the LED lamp group, and the sampling control unit is electrically connected with the LED lamp group. The sampling control unit is configured to control the connection or disconnection of the LED lamp group and the power management circuit at at least one first switching frequency, so that the current passing through the LED lamp group is kept at a first threshold value; when it is monitored that the current passing through the LED lamp set is larger than or equal to a second threshold value, the LED lamp set and the power management circuit are controlled to be switched on or switched off at least at a second switching frequency, and the second threshold value is larger than the first threshold value, so that the sampling control unit is introduced, the current of the LED lamp set can be monitored in real time, protection measures are taken in time when the current is increased abnormally, and the service life of the LED lamp set is prolonged. And the LED lamp group is prevented from being damaged. And meanwhile, the current of the LED lamp group can be controlled, so that the LED lamp group keeps stable brightness output.

The utility model discloses a display device, which comprises a display panel, a time schedule controller and a voltage conversion circuit, and is characterized in that the time schedule controller comprises a control signal output end and is used for detecting image data of a current frame picture displayed by the display panel; outputting a control signal through a control signal output end under the condition that the image data is preset image data; the voltage conversion circuit comprises a voltage conversion chip, a frequency control unit and a power voltage output end, the voltage conversion chip comprises a switching frequency control pin, and the frequency control unit is electrically connected with the switching frequency control pin and the control signal output end. The frequency control unit is used for adjusting the magnitude of the voltage transmitted to the switching frequency control pin according to the control signal, and the voltage conversion chip is used for controlling the frequency of the power voltage output by the power voltage output end according to the magnitude of the voltage received by the switching frequency control pin. The utility model aims to avoid the squeal problem of the display device.

A controller circuit is configured to generate, using a random number generator, a set of bits and determine a switching frequency using the set of bits. The controller circuit is further configured to control a switching circuit to switch at the switching frequency to drive a motor.

Provided an electronic device including a main body and a kit connected to the main body, and the main body includes a battery, a first motor, an electric wire connected to the battery, and a first controller connected to the electric wire, the kit includes a second motor supplied with power through the electric wire, an inverter connected to the second motor, and a second controller connected to the electric wire and configured to control driving of the inverter, and the second controller is configured to transmit information to the first controller through switching frequency control of the inverter and control a switching frequency of the inverter so that a current associated with the second motor is greater than zero in a section in which transmission of the information is performed.

This application relates to a method, apparatus, and computer device for controlling grid connection of a flyback converter. The method includes: obtaining grid connection parameters of the flyback converter and upper and lower frequency limits of a power switch in the flyback converter; determining a number of resonant valleys of the power switch based on the grid connection parameters and the upper and lower frequency limits; obtaining a switching frequency of the power switch based on the grid connection parameters and the number of resonant valleys; and controlling the power switch based on the switching frequency. Application of this method improves safety.

Operating system for a hybrid inverter coupled to a multiphase electric machine, comprising first gate drivers with wide-bandgap (WBG) transistors connected to a first subset of transistors, second gate drivers with silicon-based (Si) transistors connected to a second subset of transistors, and a controller. The hybrid inverter includes the first subset and the second subset of transistors arranged in phase branches, including a first section of the phase branches utilizing the first subset of transistors and a remaining section of the phase branches utilizing the second subset of transistors. The first gate driver controls the first section of the phase branches at a first switching frequency. The second gate driver controls the second section of the phase branches at a second switching frequency.The second switching frequency is lower than the first switching frequency.

The invention belongs to the technical field of electronic circuits, and provides a resonant converter. The resonant converter comprises an input end, an output end, a first switch, a second switch, a third switch, a fourth switch, a frequency controller, a resonant capacitor, a first transformer, a second transformer and a feedback circuit, the input end is connected with an external power supply, and the output end is connected with an external load. The feedback circuit feeds back the change of the current at the output end of the resonant converter to the frequency controller, and the frequency of a control signal output by the frequency controller changes in an inverse proportion along with the current of the external load so as to adjust the voltage at the output end of the resonant converter; according to the resonant converter, the primary side of the transformer is used for replacing a resonant inductor, energy stored by the primary side of the transformer can be transmitted to the secondary side of the transformer from the primary side of the transformer in a dead zone state, the switching loss of the primary side is effectively reduced, and the resonant converter can work under variable high frequency.

The present invention discloses a switching frequency control system and a control method. The system includes a first phase-locked loop and a second oscillator. The first phase-locked loop includes a phase detector, a loop filter and a first oscillator. The second oscillator and the first oscillator form a second phase-locked loop by switching. The second oscillator can output a clock signal synchronized to an external clock signal, and the second oscillator can provide a control voltage corresponding to the frequency of the external clock signal. The first oscillator is in PLL mode and switches from a first working state to a second working state. The control voltage enables the clock signal output by the first oscillator after exiting the first working state to skip the abnormal state and synchronize to the external clock signal. The switching frequency control system of the present invention effectively realizes the control of the dual-mode switching frequency in the switching power supply, ensures the stability of the output state of each oscillator in different working modes and working states, and the stability of the output state of each oscillator when different modes are switched to each other.

The application discloses a capacitor switch number control method and device, and the method comprises the following steps: obtaining the reactive power of a capacitor bank of a transformer substation and all switch displacement information of the capacitor bank; the switch displacement information contains time information, opening instruction information and closing instruction information; according to the time information, the opening instruction information and the closing instruction information are sorted and analyzed to obtain the switch action number corresponding to the capacitor bank; based on the reactive power of the capacitor bank, the capacitor bank is classified and counted to obtain a total account of capacitor bank equipment; the total account of capacitor bank equipment is associated with the switch action number corresponding to the capacitor bank to obtain capacitor switch information account based on the bus of the transformer substation; whether all the capacitors in the capacitor switch information account need to be controlled in terms of switch number is determined by using a dispersion analysis method. Therefore, the service life of the capacitor bank and the switch is prolonged, and the strategy optimization of the reactive power compensation control is realized.

The application belongs to the technical field of inverter switch control, and specifically discloses a three-level inverter switch frequency control method, device, medium and equipment. The method comprises the following steps: collecting the actual output current of the output end of the three-level inverter in real time; calculating the instantaneous error of the actual output current and the preset reference current; calculating the rising time and the falling time of the instantaneous error within the hysteresis width to obtain a natural switch period; comparing the actual output current of the output end of the three-level inverter with a set threshold to determine whether the three-level inverter enters an active frequency conversion adjustment mode; and when the active frequency conversion adjustment mode is entered, taking the natural switch period as a reference, dynamically setting the turn-on time and the turn-off time to generate a controlled switch period, so that the active adjustment of the switch frequency of the three-level inverter is realized. By adopting the segmented frequency conversion hysteresis control, the application can improve the operation reliability of the three-level inverter and prolong the service life of the power device.

The invention belongs to the technical field of inverter switching control, and particularly discloses a three-level inverter switching frequency control method and device, a medium and equipment, and the method comprises the steps: collecting the actual output current of the output end of a three-level inverter in real time; calculating an instantaneous error between the actual output current and a preset reference current; calculating rising time and falling time of the instantaneous error in the hysteresis width to obtain a natural switching period; the actual output current of the output end of the three-level inverter is compared with a set threshold value so as to judge whether the three-level inverter enters an active frequency conversion adjusting mode or not; and when the three-level inverter enters the active frequency conversion adjusting mode, the natural switching period is taken as a reference, and the turn-on time and the turn-off time are dynamically set, so that a controlled switching period is generated, and active adjustment of the switching frequency of the three-level inverter is realized. According to the three-level inverter, the operation reliability of the three-level inverter can be improved and the service life of a power device can be prolonged by adopting segmented variable-frequency hysteresis control.

The invention discloses a hysteresis current control method and system for a fixed-frequency grid-connected converter, and belongs to the technical field of converter control. The method comprises the following steps: calculating single-cycle variation and influence quantity of voltage, current instruction and hysteresis width of a power grid; calculating a frequency loop compensation gain according to the converter topology; actual switching frequency is detected and compared with an instruction value, and a ring width control instruction is generated through a PI controller; and an actual loop width instruction is obtained by combining the compensation gain, and constant switching frequency control is realized. According to the invention, through multivariable compensation and closed-loop control, the influence of power grid voltage fluctuation, current instruction change and hysteresis width adjustment on the switching frequency is effectively suppressed, the problem of unstable switching frequency of traditional hysteresis control is solved, the advantage of fast dynamic response of hysteresis control is retained, accurate and stable control of the switching frequency is realized, and the switching efficiency is improved. The method is suitable for two-level and three-level converter topologies, and has important engineering application value.