237 results about "Switching cycle" patented technology

A control unit for operating a power converter in a buck-boost mode is provided. The control unit is configured to, within a switching cycle, operate the power converter in an IN state starting from the beginning of the switching cycle until a timer signal of a timer occurs. The control unit is further configured to subsequently operate the power converter in a THROUGH state stating from the timer signal until a peak current event occurs. The control unit is further configured to subsequently operate the power converter in an OUT state starting from the peak current event until a clock signal occurs, which indicates an end of the switching cycle.

A control method and system for a resonant converter. The control method for a resonant converter comprises: in each switching cycle, determining a target power value on the basis of an input power control amount and a compensation amount corresponding to a bridge leg (S101); on the basis of the target power value, an input voltage, circuit parameters of the resonant converter, and the current operating mode of a full-bridge inverter module, determining a target slope control amount corresponding to a counter which corresponds to a switching transistor (S102); determining a comparison threshold on the basis of the target slope control amount, the current count value of the counter which corresponds to the switching transistor, and a DC bias voltage of a resonant capacitor corresponding to the current operating mode, wherein the counter starts counting using the DC bias voltage as an initial value in each switching cycle until the actual voltage of the resonant capacitor is equal to the comparison threshold (S103); and determining a control signal on the basis of the actual voltage of the resonant capacitor and the comparison threshold, and controlling the switching transistor on the basis of the control signal (S104).

The application provides a transient frequency conversion control method of a converter and an electronic device. The method comprises the following steps: determining the working state of the converter, wherein the working state comprises a light load working state and a heavy load working state; if it is determined that the working state switches between the light load working state and the heavy load working state, starting a transient frequency conversion control strategy to adjust the switching frequency of the converter, wherein the transient frequency conversion control strategy is used to adjust the duration of the freewheeling stage in the switching cycle of the converter; after the working state of the converter switches, and the clamping capacitor voltage sampling value of the converter v c satisfies a preset condition, exiting the transient frequency conversion control strategy to restore the switching frequency of the converter to normal. The dynamic response speed of the converter is effectively improved, and the overshoot and drop of the output voltage when the converter is subjected to a step load are reduced.

The invention discloses a method for improving Buck light load efficiency, which can prevent pseudo CCM operation and can keep high light load efficiency even under a large duty ratio, and comprises the following steps: after soft start of a Buck converter is completed, an enable signal at the end of soft start sets an RS trigger U3 to be in an active state, and if an inductive current zero-cross detection trigger signal rises, the RS trigger U3 is in a non-active state, the RS trigger U3 is in a non-active state, and if the inductive current zero-cross detection trigger signal is in a non-active state, the RS trigger U3 is in a non-active state. When the high-end switch and the synchronous low-end switch are switched on, the setting end input of the RS trigger U3 is triggered, a switch starting signal output by the RS trigger U3 is set at the beginning of each switching period, the switch starting signal controls the constant on-time generator to modulate the charging current or capacitance so as to prolong the time of simultaneously switching off the high-end switch and the synchronous low-end switch, and when the synchronous low-end switch is switched on, the synchronous low-end switch is switched off. And the reset end of the RS trigger U3 inputs an output signal of the constant on-time generator to trigger the RS trigger U3 to reset.

Disclosed is a system for zero voltage switching in a power converter with a first half-bridge and a second half-bridge. The first half-bridge has a first set of transistors and output inductor. The second half-bridge has a second set of transistors and auxiliary inductor. A current sensing means measures, at switching cycle scale, average and maximum current values of output inductor and average, minimum and maximum current values of auxiliary inductor. A voltage sensing means measures input and output voltages of first and second half-bridge. A controller is configured to compute dead times of pulse width modulation control signal of second half-bridge, generate pulse width modulation control signal of second half-bridge and to adapt dead times of first half-bridge.

A control unit for transitioning a power converter between a buck mode and a buck-boost mode is provided. The control unit is configured to, detect a peak current event within a switching cycle while the power converter is operated in the buck mode, and upon detecting the peak current event, start a timer for generating a timer signal. Furthermore, the control unit is configured to determine whether or not the clock signal for starting a subsequent switching cycle occurs prior to the timer signal, and to operate the power converter in the buck-boost mode within the subsequent switching cycle, if the clock signal occurs prior to the timer signal.

A series-type hybrid circuit breaker to provide protection against short circuit faults in DC or AC power circuits. A series-type hybrid circuit breaker (SHCB) forces a fault current into a high-frequency AC current with zero crossings and allows a mechanical circuit breaker to disconnect the faulty branch. The SHCB injects a transient counter voltage pulse via a pulse transformer into the main power loop upon detection of an overcurrent condition and forces the fault current to change its original direction and cross zero to a negative peak value. A generation power electronic circuit on the primary side of the transformer controls the discharge of a capacitor to generate the counter voltage pulse during the first phase of each switching cycle of the fault interruption process. The power electronic circuit then changes the polarity of the injected secondary voltage and forces the fault current to change direction and cross zero again.

Aspects of the disclosure provide techniques for providing a UE capability indicating that the UE supports dynamic switching between a plurality of uplink frequencies within at least one frequency combination of at least three uplink frequencies. The UE capability may further indicate a respective switching period for each frequency pair within each of the one or more frequency combinations. The UE may further communicate with a network entity based on the UE capability.

A control unit for operating a power converter in a boost mode is provided. The control unit is configured to detect a peak current event within a switching cycle, and upon detecting the peak current event, to start a ramp signal for the detection of a peak current event in a subsequent switching cycle.

A control device includes a PWM control unit, a current detector, and a short circuit detector. The PWM control unit outputs a control signal to the driver of a multiphase power supply in which the inductors of each phase are configured by a coupled inductor, and controls an on / off of the driver. The current detector detects the current flowing through the driver. The short circuit detector detects an inter-inductor short circuit based on a switching cycle of the driver and a current value detected by the current detector. The short circuit detector determines that an inter-inductor short circuit occurs between phases including a given phase when a differential value of the current value corresponding to the given phase is positive and greater than or equal to a threshold value during an off period of the driver in the given phase.

The invention relates to a method (100) for determining power data of electronic power circuits, comprising determining a plurality of switching energy values (110) during a periodic duration of a control signal of the electronic power circuit; and determining the power data (120) which have a switching cycle energy value that is determined on the basis of the plurality of switching energy values and a number of times the plurality of switching energy values are determined. The invention further relates to a computing unit for determining power data, which computing unit is designed and configured to carry out the method.

The application discloses an asymmetric phase-shifting control method suitable for a half-wave shaping MMC, and can realize wide-range operation energy balance of a converter. The method is characterized in that, in a 2pi period, a commutation unit switching function and a multi-level unit modulation voltage are not switched in a half-wave period pi, but in a positive half-wave mode, [0, pi] is taken as a reference to expand and shift an angle theta to the left and right, that is, the interval is [-theta, pi+theta], and in a negative half-wave mode, [pi, 2pi] is taken as a reference to shrink and shift an angle theta to the left and right, that is, the interval is [pi+theta, 2pi-theta]. The application adopts an asymmetric phase-shifting modulation method, generates and reverses polarities of two asymmetric partial sine waves through a commutation switch cooperating with a multi-level unit, and obtains a complete multi-level sine wave on an alternating current side. The application can eliminate the limitation of a power factor angle on a phase-shifting angle while realizing wide-range energy balance of the converter, is only affected by a modulation ratio, and compared with symmetric phase-shifting modulation, is beneficial to simplifying commutation control logic when the system is in a wide-range reactive power regulation, and has better engineering application value.

This invention relates to the fields of semiconductor information storage and artificial synaptic devices, specifically to a biological synaptic intrinsically self-assembled topological phase-change memristor and its fabrication method. The fabrication method includes: providing a substrate; depositing a bottom electrode; and depositing SrFeO on the bottom electrode. x The thin film serves as the storage medium layer; the storage medium layer undergoes heat treatment, including in-situ annealing and post-annealing. By controlling the oxygen pressure difference between in-situ and post-annealing, the single-component SrFeO is made more efficient. x An intrinsically self-assembled superlattice structure, characterized by alternating vertical and horizontal orientation regions of oxygen vacancy channels, spontaneously forms within the thin film. This structure restricts the formation sites of conductive filaments, significantly improving the consistency and stability of the device's resistive switching cycle. The process of this invention is simple, requiring no introduction of a second-phase material. The resulting memristor requires no electrical formation, exhibits a high on / off ratio, multi-level storage, and short-term synaptic plasticity, making it applicable to neuromorphic computing chips and artificial intelligence devices.

A power converter includes a transformer, a main switch, an active clamp switch, and a primary side controller circuit. The primary side controller circuit is configured to indirectly measure a magnetizing current through the transformer during a first switching cycle of the power converter and estimate a zero-crossing point of the magnetizing current for a second switching cycle based on the indirect primary side measurement of the magnetizing current. Based on the estimated zero-crossing point, the primary side controller circuit generates an auto-tuned delay, for the second switching cycle, between disabling the main switch and enabling the active clamp switch before the zero-crossing of the magnetizing current occurs. The active clamp switch is enabled during the second switching cycle in accordance with the auto-tuned delay.

A controlling method of a power converter includes performing a first switch controlling step and a second switch controlling step. The first switch controlling step is performed to control a primary switch of the power converter by a first controlling signal. The second switch controlling step is performed to control an active clamp switch of the power converter by a second controlling signal. The primary switch is turned on by the first controlling signal at each of a plurality of power converter switching cycles. The active clamp switch is not turned on by the second controlling signal at a part of the power converter switching cycles, and the active clamp switch is turned on by the second controlling signal at another part of the power converter switching cycles.

A voltage-controlled bridge is coupled to the line voltage and the transformer primary harmonic voltage, while a current-controlled bridge is coupled to the line current and the transformer secondary harmonic voltage. A synchronous average harmonic current compensator synchronously integrates the error between the measured bridge current and the command current every half-switch cycle and samples the compensator output to control the line current and linearize the harmonic coupling between the isolation bridges. A synchronous pulse-width modulation process tracks the commanded line voltage. One or more of the primary and secondary harmonic command circuits regulate the harmonic coupling voltages of the voltage-controlled and current-controlled bridges, respectively. The line voltage, line current, and primary and secondary harmonic commands provide generalized line and isolation voltage bus regulation freedom within a single stage.

The application relates to the technical field of fault prediction, and specifically discloses a gate loop inductance detection method for fault prediction, which comprises the following steps: collecting voltage signals of a gate drive node in continuous multiple switching cycles, converting the voltage signals into voltage values, and drawing a voltage waveform according to the voltage values; counting the number of times that a preset stable high level is greater than in the rising edge Si, and counting the number of times CS in all switching cycles; counting the number of times that a preset stable low level is less than in the falling edge Xi, and counting the number of times CX in all switching cycles; calculating the rising time and the falling time based on the voltage waveform, and averaging the rising slope and the falling slope; calculating the rising index and the falling index; and judging the fault cause based on the rising index, the falling index, the number of times CS and the number of times CX. The application realizes early fault identification and root cause differentiation by counting the gate waveform features of multiple switching cycles, and improves the diagnostic accuracy and the system reliability.

This invention relates to the field of power electronics, specifically to an online parameter identification model predictive control method for grid-connected inverters: The method involves measuring the grid-side current and voltage at the start of the current switching cycle; applying a control signal to the grid-connected inverter; calculating the reference current for future switching cycles; identifying the real-time inductance and resistance of the line through online parameters; calculating the grid-side current at the start of the next switching cycle based on the real-time inductance and resistance, and compensating for the current prediction error of the predicted grid-side current in the cycle after that; constructing a reserve set of action vectors based on the current error vector quadrant between the compensated reference current for future switching cycles and the grid-side current at the start of the next switching cycle; and selecting the optimal voltage vector from the reserve set according to a value function for use in the next switching cycle. Compared with existing technologies, this invention addresses the shortcomings of fixed parameters, corrects prediction deviations caused by fixed parameters, and achieves more accurate voltage vector selection.

The application provides a current sampling system and method, the current sampling system comprising a motor three-phase circuit and a processing module; a first phase comprising a first IGBT chip and a second IGBT chip; a second phase comprising a third IGBT chip and a fourth IGBT chip; a third phase comprising a fifth IGBT chip and a sixth IGBT chip; a sampling unit of the processing module sampling at a wave trough moment and a wave peak moment of a switching cycle to form a first current sampling value and a second current sampling value; a calculation unit extracting effective current sampling data in the first current sampling value and the second current sampling value at the wave trough moment of the switching cycle, and correcting current sampling zero value data in the first current sampling value and the second current sampling value into estimated current sampling data. After the above technical scheme is adopted, the sampling current of the on-chip current sensor in the new generation of IGBT chips can be directly used for motor control, the current sensor in the original circuit is saved, the circuit structure is simplified, and the cost is reduced.

A system may include a power converter comprising a power inductor and a plurality of switches and a controller configured to control the power converter, including controlling the power converter in discontinuous conduction mode to magnetize and demagnetize the power inductor, wherein the controller is further configured to, in each switching cycle of the power converter, terminate a magnetization period of the power inductor based on a function dependent upon an output voltage of the power converter and a power inductor current flowing through the power inductor.

This application relates to modulator circuits (401, 501) for driving switching output stages (102) in a class-D amplifier system (400) or the like. The switching output stage (102) has an output node (105) and high-side and low-side switches (104H, 104L) for selectively connecting the output node to respective high-side and low-side voltages (VH, VL) and is configured to be operable in a continuous conduction mode of operation, in which there is always an output current flowing throughout a switching cycle and also in a discontinuous conduction mode of operation where there is a period in each switching cycle where there is no output current. The modulator circuit comprises a compensator (407, 408) operable to apply compensation, in the discontinuous conduction mode of operation, to at least partly compensate for a non-linearity when operating in the discontinuous conduction mode.

This application provides an output control circuit, a flyback converter, a chip, and an electronic device. The output control circuit can obtain a first output voltage from a first output circuit and a second output voltage from a second output circuit, and control the first and second output circuits to conduct sequentially based on the first and second output voltages in each switching cycle. Therefore, the output control circuit can determine a first freewheeling circuit and a second freewheeling circuit in the first and second output circuits, so that the magnetizing inductance of the transformer in the flyback converter transfers energy to the first and second freewheeling circuits respectively during the secondary freewheeling phase. That is, the magnetizing inductance transfers energy using high-frequency chopping in each switching cycle, making the high-frequency chopping frequency of the first and second output circuits equal to the switching frequency. Since the switching frequency is usually higher than the range of human hearing, the problem of audio noise can be solved, and the performance of the flyback converter can be improved.

The circuits and methods of the present disclosure control the active off-time (high side switch on-time) to ensure the magnetization energy release and resonant capacitor energy release in an asymmetrical half-bridge (AHB) converter finish at the same time and all the stored energy is delivered to the output in each switching cycle. Multiple, parallel, techniques to control the high side switch on-time are illustrated. One is to track the volt-seconds applied during the storage cycle and allow the active release off-time to be limited to the same volt-seconds. A second option is to provide a high side switch on-time that is proportional to the on-time of the low side switch in that switching cycle. A third option is to provide a maximum high side switch on-time that can be programmed to ensure the high side on-time is equal to or smaller than half of the resonant period.

This invention discloses a model predictive current control method and system based on online parameter identification. The method independently identifies the resistor using steady-state average information within a switching cycle, and then identifies the inductor using transient current ripple information combined with a logarithmic linearization method. Next, the identified real-time resistance and inductance values ​​are input into a deadbeat-free model predictive current control algorithm to update the coefficients of the predictive model. Based on the latest model parameters and reference current, the controller calculates the ideal voltage vector required to eliminate current error at the next moment, and after amplitude limiting, drives the switching transistor through a PWM module, thereby achieving high-performance control of the coil current. The system includes an online parameter identification module and a model predictive control module. By using this invention, high accuracy and high stability of the magnetic bearing power amplifier are ensured under all operating conditions. This invention can be widely applied in the field of electronic power technology.

The invention discloses a double-Beta distribution vector pulse width modulation method and system introducing an overlapping factor, and the method comprises the steps: constructing double-Beta symmetrical distribution introducing the overlapping factor, and constructing a probability density distribution function of a double-Beta symmetrical distribution random carrier period strategy; constructing a power spectral density function of the expanded random carrier switching period signal based on the random carrier signal; and carrying out power spectral density analysis on the power spectral density function of the expanded random carrier switching period signal based on the probability density distribution function of the double-Beta symmetric distribution random carrier period strategy to realize random carrier switching period permanent magnet synchronous motor control. According to the invention, local energy accumulation can be weakened, smooth spectrum transition can be realized, and adjustable control of a sideband voltage harmonic peak value can be realized. The overlapping factor-introduced double-Beta distribution vector pulse width modulation method and system can be widely applied to the technical field of pulse width modulation driving.

A non-isolated converter includes a transformer having a primary winding and a secondary winding, a primary-side inverter, a secondary-side rectifier, and an output filter. The primary-side inverter is a full-bridge inverter providing two conduction paths for primary current during ON intervals of a switching cycle. The conduction paths are connected at a low-side common connection directly connected to the output side of the secondary winding, to provide the converter output current as the sum of the primary current and the secondary current during the ON intervals. Because the converter output includes a contribution from primary-side current due to the direct connection, certain advantages may be realized such as reduced primary-winding area / losses and reduced losses in the secondary-side rectifier.

The invention discloses a high-speed rail 5G system switching method, device and equipment based on dynamic beam forming and a medium, and relates to the technical field of high-speed rail communication, and the method comprises the steps: constructing a beam forming signal model; constructing a beam forming signal switching model according to the beam forming signal model; the beam forming signal switching model is used for judging to trigger a switching activation event when the received signal receiving power of the target base station is continuously higher than the signal receiving power of the source base station in the moving process of the train and the difference value exceeds a preset lag threshold; constructing a beam direction optimization problem; the objective of the beam direction optimization problem is to minimize the beam forming signal switching failure probability and the beam forming adjustment overhead; and solving the beam direction optimization problem by adopting deep reinforcement learning to obtain the optimal beam direction of the source base station and the target base station under each time slot in the switching period of the beam forming signal, and realizing high-reliability and low-delay switching control in a high-speed railway scene.

Disclosed in embodiments of the present disclosure are a switching configuration method and an apparatus, applicable to the technical field of communications. The method executed by a terminal device comprises, receiving switching indication information sent by a network side device, wherein the switching indication information is used for indicating information of a target frequency band in a plurality of frequency bands, and the plurality of frequency bands are used for uplink antenna switching and respectively correspond to different switching periods; and according to the switching indication information, determining a switching period corresponding to the target frequency band as a target switching period. Therefore, a terminal device can determine a switching period corresponding to a target frequency band as a target switching period, thereby avoiding uplink antenna switching failure caused by incapability to determine a switching period.

A power module includes N groups of interleaved parallel PFC circuits and a controller. Each group of the interleaved parallel PFC circuits includes a PFC inductor, an autotransformer, a first rectifier bridge arm, and a second rectifier bridge arm. The autotransformer includes a first winding and a second winding that are coupled to each other. The controller is configured to: in response to that an absolute value of a difference between a current of the first winding and a current of the second winding is greater than or equal to a preset value, adjust a duty cycle of a drive signal of a switching transistor of the first rectifier bridge arm or the second rectifier bridge arm in a next switching cycle.

The present application relates to air conditioner detection technical field, propose a kind of air conditioner electrolytic capacitor health on-line detection method and system, the air conditioner electrolytic capacitor health on-line detection method includes collecting the voltage ripple signal of DC-DC step-down converter output in air conditioner, and detects the zero-crossing time of first time through direct current average voltage in a switching cycle, obtains first zero-crossing time;At the switching on starting moment or switching off moment of switching cycle, single sampling is carried out to output voltage ripple signal, and sampling voltage value is obtained;According to the running state of DC-DC step-down converter, it is judged that DC-DC step-down converter is currently in continuous conduction mode or discontinuous conduction mode;Based on the judgment result, corresponding capacitor parameter calculation model is selected, and the capacitance value and equivalent series resistance of output capacitor are calculated;The capacitance value and equivalent series resistance calculated are compared with preset threshold value, and if exceed threshold value, then trigger capacitor health state early warning.