399 results about "Soft switching" patented technology

The invention discloses a multi-objective optimization method and system for dual active bridge circuit expansion phase shift modulation, and the method comprises the steps: calculating a voltage matching ratio, and determining an external phase shift angle ratio based on a difference value between an output voltage and an output voltage reference value; according to the voltage matching ratio and the external phase shift angle ratio, obtaining an internal phase shift angle ratio of the primary side full bridge through an offline lookup table; calculating the maximum transmission power of the dual-active bridge converter, and determining a current working mode from the six preset working modes based on the size relationship between the inner phase shift angle ratio and the outer phase shift angle ratio; generating an optimal modulation strategy through a multi-objective optimization algorithm by taking the current effective value and the current peak value as optimization objectives and combining the voltage matching ratio and the periodic parameters of the current working mode; and generating a trigger signal of each switch tube of the dual-active bridge converter. Through six-mode working area division, complete differential algorithm boundary constraint and off-line-on-line collaborative optimization, the contradiction between the current stress and the soft switching range of the converter under extended phase shift modulation is solved.

The invention discloses a soft switching modulation method and system for minimum current stress in a full power range. The system comprises an expansion phase shift optimization unit, an in-loop direct power control unit and a cooperative control unit. The in-loop direct power control unit is used for obtaining dynamic correction power, the expansion phase shift optimization unit is used for generating a phase shift ratio combination [D1, D2] which simultaneously meets the minimum current stress and the ZVS condition, and the cooperative control unit generates a PWM driving signal according to the generated phase shift ratio combination [D1, D2] to achieve soft switching control. According to the invention, the problem of current stress minimization in a wide voltage range can be effectively solved, the problem of ZVS loss in a light-load working condition can be prevented, and a load / voltage sudden change condition can be coped with in time; through the design of the ZVS boundary guarantee, the method is especially suitable for scenes needing wide voltage range efficient energy transmission, such as new energy grid connection and electric vehicle charging.

The invention relates to an external phase shift angle determination method and system, a frequency conversion phase shift control method and a chip, and the method comprises the steps: obtaining an external phase shift angle based on a general solution of a time domain differential equation of a resonant inductor current and a resonant capacitor voltage of a DBSRC equivalent circuit and the symmetry of the DBSRC equivalent circuit; determining a first current value of the resonant inductor at the first moment and a second current value of the resonant inductor at the second moment; based on the first current value when the primary bridge circuit meets the ZVS soft switching requirement, obtaining a first relational expression of the external phase shift angle about the input voltage and the output voltage of the DBSRC and the switching frequency of the switching tube; based on a second current value when the secondary-side bridge circuit meets the ZVS soft switching requirement, obtaining a second relational expression of the external phase shift angle with respect to the input voltage, the output voltage and the switching frequency; according to the first relational expression, the second relational expression and the steady-state voltage value of the output end of the DBSRC, the expression of the external phase shift angle about the switching frequency, the steady-state voltage value and the input voltage is determined; the scheme is simple, the accuracy is high, and the portability is high.

The present invention discloses a method for siting and sizing a flexible soft switch of a distribution network based on mixed second-order cone programming, including: acquiring interconnected flexible distribution system data; establishing and optimizing, based on the interconnected flexible distribution system data and an interconnected flexible distribution system constraint, a flexible soft switch siting and sizing model with a minimal daily comprehensive operation cost as an objective; and acquiring an optimal flexible soft switch siting and sizing solution by using combination of an improved sparrow algorithm and second-order cone programming to solve. The present invention is both reliable and economic.

The invention discloses a high-efficiency single-stage bidirectional power conversion topological structure capable of realizing full-range soft switching and a control method of the high-efficiency single-stage bidirectional power conversion topological structure. In a single-stage bidirectional power conversion topology formed by double half bridges and a switch matrix, a controlled current source connected in parallel with a primary side of a second transformer is designed; the current on a bridge arm connected with the primary side of the second transformer can be effectively changed, so that the soft switching range of a switching tube on the bridge arm in a wide power transmission range is widened, and full-range soft switching in a power frequency period can be realized in any load range; the controlled current source is designed to only work before and after the switching moment of the primary side switching tube of the second transformer, the current stress of the switching tube can be effectively reduced, and meanwhile, the loss of the additional controlled current source is very small. According to the invention, the working range of the soft switching is widened, the additional loss caused by the soft switching is greatly reduced, higher efficiency and higher power density can be realized, and the cost advantage is realized.

The invention discloses an intelligent soft switching and multilayer electro-hydrogen hybrid energy storage two-stage space-time decoupling configuration method and system. The method comprises the following steps: inputting basic data and initializing network basic parameters; in the first stage of constructing the two-stage MEH-SOP model, the power / capacity of each device of the MEH is optimally configured on the basis of annual 8760h time sequence operation simulation considering time-of-use electricity price; constructing a second stage of the two-stage MEH-SOP model, extracting typical scenes of MEH full-year high-power charging / discharging and power distribution network full-year voltage serious out-of-limit, and optimally configuring SOP multi-port capacity; and solving the constructed two-stage MEH-SOP model, and outputting an optimal configuration result. According to the invention, a multi-level energy storage system covering from the day to the week is constructed, and the multi-port SOP direct current side is connected in a modularized manner, so that the structural flexibility and the operation flexibility of the power distribution network are remarkably enhanced.

The application discloses a single-stage bidirectional power conversion topology structure capable of realizing wide-range soft switching and a control method thereof. The bridge-in and bridge-between phase shift control of a double half-bridge circuit and a high-frequency switch matrix provides a basis for realizing soft switching of all power tubes. The soft switching of a wide voltage variation range is realized by real-time adjustment of a switching frequency according to the size of a port voltage. The bridge arm current connected with the primary side of a second transformer is the sum of the primary side current of the second transformer and the inductance current connected with the primary side of the second transformer in parallel. By designing the inductance value of the parallel inductance connected with the primary side of the second transformer, the bridge arm current connected with the primary side of the second transformer can be effectively changed, so that the soft switching realization range of the switching tube of the bridge arm connected with the primary side of the second transformer under the wide power transmission range can be expanded.

The invention discloses an OLTC topological structure of an electronic soft switching technology and a driving method. In the topological structure, a power supply is connected with a first transformer, the first transformer is connected with a second transformer, and the second transformer is connected with a load; a low-voltage winding of the first transformer is connected with a plurality of taps; the fixed end of the low-voltage winding of the first transformer and each tap are connected with one end of an independent mechanical switch; according to an interval connection mode, the other ends of all the mechanical switches are connected to form two series switch loops, and each series switch loop is connected with an independent electronic change-over switch to form two series circuits; the two electronic change-over switches are connected in parallel, and the second transformer is connected into a series circuit controlled by the two electronic change-over switches respectively. The mechanical switch and the electronic change-over switch are jointly used, so that short-circuit current and surge voltage cannot be generated when the electronic change-over switch performs state switching, and the quality of output voltage waveforms is improved.

The invention discloses a control method for improving the heavy load efficiency of an asynchronous parallel soft switching inverter, and the method comprises the following steps: S1, constructing a topological structure of the asynchronous parallel inverter, generating a DPWM modulation wave through zero-sequence component injection in a QCM mode, and enabling a power tube not to act in a specific interval in a fundamental wave period; s2, adjusting a clamping interval of a DPWM1 strategy by correcting the injected zero-sequence component; s3, calculating a phase shift angle, and generating carrier waves of a leading bridge arm and a lagging bridge arm; s4, when the power tube enters or exits from the non-action interval, transition interval control is carried out, so that the differential mode inductance circulating current is reduced to 0; and S5, generating a driving signal of a hybrid control strategy based on DPWM modulation, and controlling a switching tube to act according to the optimized clamping interval and transition logic. According to the method, the current stress and on-state loss of the power tube of the asynchronous parallel inverter under the heavy load are reduced, and the current stress minimization of the power tube and the efficiency maximization of the inverter are realized.

The invention relates to a dual-active bridge converter backflow power and soft switching range coordinated optimization control method, which widens the soft switching range of a dual-active bridge under full power on the premise of keeping the lowest backflow power, thereby improving the converter efficiency under a high switching frequency scene. According to the scheme, an optimization mapping relation of combination of different optimization input parameters k and output shift phases is given, so that control and implementation are facilitated.

The invention relates to an intelligent energy storage soft switching configuration method considering refined photovoltaic power generation potential evaluation. The method comprises the following steps: constructing a photovoltaic power generation potential evaluation model based on a physical model chain; constructing an intelligent energy storage soft switch model; and configuring the obtained intelligent energy storage soft switch model. An energy storage device is integrated to a direct current port of an SOP, an intelligent energy storage soft switching device model is constructed, a power distribution network has space-time flexible adjustment potential, an intelligent energy storage soft switching configuration method considering photovoltaic power generation potential evaluation is provided, a space power transfer-time energy scheduling two-dimensional cooperation mechanism of an E-SOP is utilized, and the power distribution network is optimized. And the energy production and elimination among the regions are balanced, so that the random fluctuation of the source and load sides of the power distribution network can be better relieved.

The invention provides a fixed-frequency inductive-current-sensor-free four-switch buck-boost soft switching control method, which comprises the following steps of: generating a regulating variable based on a deviation between an output voltage and a reference value, and determining a time sequence parameter of each stage of the period; charging and discharging in opposite directions are carried out on output junction capacitors of two switch elements of the same bridge arm by utilizing inductive current in a commutation dead zone; when it is detected that the duration of the free circulation stage of the current period does not exceed a preset lower limit, adjusting the time sequence of at least one stage to execute power expansion under a fixed switching frequency, and meanwhile, keeping on under a zero voltage condition; identifying a bias component of the inductive current based on indirect characterization of the output current to the inductive current, and performing correction by adjusting a timing sequence of at least one stage; and combining the outputs of the time sequence generation, the power expansion and the offset correction obtained in the previous steps into a time sequence parameter of the current period. According to the method, the microgrid conversion requirements of a wide voltage adaptation scene on high efficiency, high power density and high robustness are effectively met.

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 discloses a power modulation method, system and device for an isolated single-phase DC-AC converter and a medium, and the method comprises the steps: firstly, carrying out the sampling of input and output voltage and current, and obtaining the size of transmission power; then determining the soft switching current of the primary and secondary side switching tubes; determining inner and outer phase shift angles according to the soft switching threshold current; calculating a switching frequency based on the transmission power; determining dead zone time of a primary side bridge arm and a secondary side bridge arm according to the phase shift angle, the switching frequency and a soft switching constraint condition; and finally generating a PWM driving signal. According to the invention, ZVS soft switching of all switching tubes on the DC side and the AC side can be realized, loss caused by operation of the switching tubes in the fourth quadrant in the dead zone time is optimized, the working operation efficiency of the converter is improved, the power control strategy is simple, and the method has high practical application value.

The invention discloses a gallium nitride soft switching high-voltage Buck voltage converter, belongs to the technical field of switching power supplies, and solves the problems of large device switching loss, high thermal stress, large voltage peak and high-frequency oscillation caused by a switching capacitor link in a traditional high-voltage Buck switched capacitor voltage converter by introducing an auxiliary soft switching link. The efficiency and the reliability of the system are improved; furthermore, by introducing a double-phase interleaving parallel structure, the current output capability of the power supply is improved, and the application in a higher power scene can be realized; meanwhile, by adopting the gallium nitride transistor, compared with the traditional scheme, the switching frequency is improved, the size of a passive element is reduced, the integration level of a PCB is improved, the parasitic parameters of the system are reduced, the dead time and the duty ratio loss are reduced, and the system efficiency and the power density are further improved.

The application provides a driving method of an inverter bridge, a driving circuit, a servo driver and a motor device. In the driving method of the inverter bridge, voltage vector output time and dead time are set, so that a power switch tube of a jth bridge arm is kept in a conduction state in two adjacent voltage vector output times before switching, the power switch tubes kept in the conduction state are changed in turn and staggeredly, in each dead time, two other power switch tubes kept in the conduction state in a previous voltage vector output time are switched off, the corresponding switching bridge arm and winding complete resonance work, the end voltage of the power switch tube to be turned on is clamped to zero potential, zero voltage conduction is realized, a soft switching mode is formed, and the switching loss is reduced and the power conversion efficiency is improved.

The invention relates to a streaming voice service concurrent processing method based on soft switching, and the method comprises the steps: building and maintaining a global voice recognition channel with an ASR server, continuously forwarding a user voice stream to the ASR server during a whole session period, and receiving a recognition result; processing the recognition result by adopting a finite-state machine and a large language model to generate a response text for multiple rounds of dialogues; and concurrently executing TTS processing while the global speech recognition channel is continuously operated: segmenting a response text into a plurality of segments according to semantics to perform streaming speech synthesis, and immediately sending a pseudo response after receiving first speech data so as to trigger a soft switch system to pre-load a playing buffer area in advance. Through global reception and concurrent processing, smooth multi-round dialogues which can be interrupted at any time are realized, and the interaction delay is reduced from a second level to a millisecond level by using a text fragmentation and early media triggering technology, so that the user experience and the interaction efficiency of an intelligent call center are remarkably improved.

The invention provides an X-ray machine power supply output current adjusting method and device, and relates to the field of medical power supplies. The method comprises the following steps of: controlling a switching tube to complete inversion by using symmetrical PWM (Pulse Width Modulation), and obtaining stable DC (Direct Current) output by completing DC / DC (Direct Current / Direct Current) conversion; compared with a traditional half-bridge circuit, a symmetrical PWM control mode is adopted; a branch composed of a diode and an auxiliary switch tube is added to the circuit. The main switch not only can well realize soft switching, but also works in a symmetrical state; the auxiliary switch tube realizes ZVS and ZCS conduction; according to the invention, soft switching of the power device is realized, and the device is small in stress and high in reliability.

The invention relates to the field of power electronic converters and control, in particular to an SOP power module dead-zone effect suppression method, which comprises the following steps: acquiring the current transmission power of an SOP power module; based on the transmission power, generating a first bus voltage instruction used for controlling an AC-DC side direct current bus voltage and a second bus voltage instruction used for controlling a DC-AC side direct current bus voltage, adjusting the corresponding direct current bus voltage so as to inhibit polarity reversal of a DAB converter bridge port voltage, and according to the transmission power of the SOP power module, adjusting the polarity of the DAB converter bridge port voltage. A first bus voltage instruction and a second bus voltage instruction are generated, the first bus voltage instruction and the second bus voltage instruction are made to be unequal during light load, a bus voltage difference value is formed, and it is ensured that the direct-current bus voltages on the two sides meet the condition for restraining DAB bridge port voltage polarity reversal in the dead-zone time period by means of compensation for frequency doubling fluctuation components in the direct-current bus voltages. Current zero step is eliminated, soft switching is recovered, voltage stability under light load is improved, extra hardware or complex control is not needed, and engineering realization is simple and convenient.

The invention discloses a light load efficiency optimization method for an asymmetric half-bridge flyback converter in the technical field of asymmetric half-bridge flyback converters, which comprises the following steps of: starting a first switching period, and starting a second switching period when the first switching period is finished, and switching on the input voltage of a first switching tube in the asymmetric half-bridge flyback converter at the beginning of a second switching period, increasing the excitation current to an excitation current peak value based on the input voltage, and switching off the first switching tube. The asymmetric half-bridge converter is controlled by using the N first switching periods and the first interval time to form the second switching period, and the output voltage is stabilized by cooperatively adjusting the length of the second switching period, so that the switching frequency of the first switching period can be prevented from being too high under the condition of realizing soft switching of the converter; therefore, driving loss and switching loss are reduced, and the light-load efficiency of the converter is improved.

The invention provides a wireless electric energy transmission system and a control method, relates to the technical field of wireless electric energy transmission, and is used for realizing soft switching irrelevant to the load weight and the coupling coefficient so as to improve the system efficiency and reduce the thermal runaway risk. The wireless power transmission system comprises an inverter, a magnetic coupling structure, a rectifier and a controller, the input end of the inverter is electrically connected with the direct-current power supply end, and the output end of the inverter is electrically connected with the input end of the magnetic coupling structure; the input end of the rectifier is electrically connected with the output end of the magnetic coupling structure; the output end of the rectifier is connected with a load; the control end of the controller is electrically connected with the control end of the inverter; and the controller is configured to collect the voltage of the input end of the magnetic coupling structure in real time, compare the voltage with a preset upper threshold voltage and a preset lower threshold voltage, and output a driving signal according to a comparison result to control the on and off of the inverter, so that the inverter realizes zero-voltage switching in a full-power range.

The application relates to the technical field of switching power supply, and discloses a bridge type low-stress passive soft switching boost power factor correction circuit, which comprises a direct current input power supply, a main power switching tube, an output filter capacitor and a coupling inductor comprising a primary side and a secondary side; a passive soft switching buffer network is connected to a main circuit of the circuit, the network comprises a diode full-bridge structure and a buffer capacitor, and the leakage inductance of the secondary side of the coupling inductor is connected between the midpoints of two bridge arms of the full-bridge structure; the application utilizes the ratio difference of the coupling inductor to generate a forward potential difference, drives the buffer capacitor to reversely charge to establish a negative voltage, and further provides a discharge circuit for the parasitic junction capacitance of the main power switching tube, so that zero voltage turn-on is realized, and high-frequency switching loss is reduced; meanwhile, the highest voltage stress of the semiconductor device is clamped in the range of the direct current output voltage through the potential restriction of the full-bridge network. The application does not need auxiliary active devices, and improves conversion efficiency and reliability while simplifying the system structure.

The invention discloses a wireless charging system soft start method and system based on relative phases between inverters, and the method comprises the steps: configuring all lower bridge arm switching tubes of a standby inversion unit to be in a permanent conduction state, and configuring all upper bridge arm switching tubes to be in a permanent turn-off state in a standby stage; receiving the position detection signal, and driving the standby inverter unit to be started by a preset PWM signal when it is determined that the standby inverter unit is started based on the position detection signal; the internal phase shift angle of the standby inverter unit is dynamically adjusted to be increased from 0 degree to 180 degrees, and the phase shift compensation angle is determined in real time based on the phase deviation of the adjacent active inverter unit and the standby inverter unit, so that the adjacent active inverter unit and the standby inverter unit are kept in an inverse relation based on the dynamically adjusted phase shift compensation angle. And soft start of the system is realized. According to the invention, soft switching can be realized in the standby and starting processes of the system, and the electromagnetic interference of system operation is reduced.

The invention relates to a communication media exchange method and system based on SIP soft switch, and belongs to the technical field of SIP soft switch communication. The method comprises the following steps of: determining a media stream transmission endpoint based on soft switch signaling call routing of SIP (Session Initiation Protocol); processing and distributing the original media stream in real time; and the processed media stream is directly docked to realize intelligent interaction. The method has the effect that the docking efficiency with the AI large model can be improved as much as possible.

The invention discloses a bidirectional DC-AC converter control method considering a soft switching condition and current optimization. According to the invention, the switching loss of the converter is reduced by optimizing the phase shift angle and the switching condition of the converter, and the energy transmission efficiency is optimized by minimizing the effective value of the current, so that the performance of the whole sodium battery energy storage system is improved. Specifically, based on the relation between the excitation inductance Lm and the current effective value Iprms, the phase shift angle of the converter is accurately controlled, the current transmission efficiency is optimized, and it is ensured that the zero-voltage switching condition of a primary side bridge arm and a secondary side bridge arm can be achieved in the working process, so that the loss of the converter is remarkably reduced, and the energy conversion efficiency is improved.

The invention relates to a converter circuit and electronic equipment. The converter circuit comprises an active clamping circuit, a control circuit and a voltage stabilizing circuit, active devices in the active clamping circuit are controlled through the active clamping circuit to realize soft switching, that is, a first switching tube and a second switching tube are controlled to realize soft switching, so that the conduction loss of the first switching tube and the second switching tube is reduced, and the switching efficiency is improved. The problem that large loss is caused when the PFC converter works at high frequency due to the fact that an existing passive clamping circuit cannot achieve soft switching is solved.

The invention discloses a flexible power distribution system planning method and system based on a long-short time energy storage type soft switch. The method comprises the following steps: establishing a source-network-load-storage cooperative operation framework of a flexible power distribution system; constructing a long-short time energy storage type soft switch model, wherein the long-short time energy storage type soft switch model is formed by integrating an energy type energy storage unit and a power type energy storage unit to a direct current side of a soft switch; an integrated planning model of the flexible power distribution system is established, wherein the integrated planning model comprises configuration and operation constraints of source side, network side, load side and storage side equipment based on a collaborative operation framework, and an optimization objective function with the purpose of minimizing the total cost of the whole life cycle of the system; and solving the integrated planning model, and determining an optimal configuration capacity and an operation strategy of each device in the system. Through the introduction of the long and short time energy storage type soft switch, although the early equipment investment is increased, the total cost of the scheme is reduced in the whole planning period due to the operation benefit brought by the long and short time energy storage type soft switch.

The invention discloses an auxiliary resonance full-soft switching FSS-BUCK direct current converter which comprises an input filter capacitor C0, a main switching tube S1, an auxiliary resonance switching tube S1a, a resonant capacitor Cr1, an output filter inductor L1, a resonant inductor Lr1, a fly-wheel diode D1 and an output filter capacitor C1. The invention further discloses a control method. The control method of the FSS-BUCK direct-current converter is as simple as control of a common BUCK topology, the efficiency of a traditional BUCK topology circuit is greatly improved, the limitation of the switching frequency of a power electronic device is broken through, the power electronic device can be used in an over-limit mode, and the FSS-BUCK direct-current converter is a breakthrough key technical invention in the field of new energy in the future.

The invention provides a resonant converter parameter optimization method and system of an electric vertical take-off and landing aircraft, and relates to the technical field of aviation power electronics. The method comprises the following steps: constructing an improved equivalent circuit model containing transformer secondary side leakage inductance; deriving a voltage gain function expression of the improved equivalent circuit model and an optimization calculation formula of the excitation inductance required for realizing the soft switching; parameter optimization is carried out based on the voltage gain function expression and the excitation inductance optimization calculation formula; and building an LLC resonant converter experimental prototype according to the optimized parameters, and carrying out system verification and performance evaluation. According to the invention, the problem of performance reduction caused by neglecting secondary side leakage inductance under a high-frequency working condition in a traditional design is solved, the efficiency, the voltage stabilization precision and the power density of the converter are remarkably improved, and the high requirement of eVTOL on an airborne power supply is met.

The invention provides a multi-resonant switched capacitor efficient cooperative operation method suitable for battery active equalization, and the method comprises the steps: building a zero-voltage soft switching realization condition model of a single-module resonant unit, and determining the amplitude constraint and direction constraint of a soft switching current needed by a switching tube for realizing zero-voltage switching; based on topology, identifying current paths of the half bridges located at the top layer, the middle layer and the bottom layer in the soft switching transient process, and determining a mathematical relationship between the soft switching current of each layer of half bridge and the current of each resonant cavity; respectively establishing equivalent circuit models at switching moments for the top-layer half-bridge, the middle-layer half-bridge and the bottom-layer half-bridge, and solving to obtain each initial current value of the corresponding junction capacitor voltage at the switching moments; and substituting each initial current value obtained by solving into the established constraint condition, and drawing an operation parameter boundary of the topology capable of realizing soft switching in all working modes. According to the invention, by determining the operation boundaries of all half-bridge soft switches of the multi-resonant switched capacitor structure, the switching loss is reduced, and the operation efficiency is improved.