6075results about "Efficient power electronics conversion" patented technology

The invention relates to the technical field of power electronics, and discloses a soft switch of a high-frequency switch transformer and a distributed control method and system thereof, and the method comprises the steps: achieving the precise synchronization of nodes through the construction of a ring topology network, combining the monitoring of multiple physical quantities with the collaborative optimization of parameters, dynamically adjusting the parameters of a resonant network and a driving time sequence, and achieving the precise synchronization of the nodes. A zero-voltage switching state is maintained, and electromagnetic interference is suppressed by adopting the composite optimization model; the system comprises a network initialization module, a multi-physical-quantity monitoring module, a space-time synchronization control module, a resonance parameter adjustment module, an electromagnetic optimization decision module, a dynamic adjustment module and a parameter evolution module. The stability of the soft switch is improved through a distributed network and time-space synchronization, and the loss is reduced by adopting a dynamic optimization algorithm; constructing an electromagnetic interference optimization model to enhance compatibility; performing multi-parameter fusion and weight distribution to optimize dynamic response; the reliability is improved through a high-precision protocol and coevolution; and the tensor product framework realizes multi-dimensional intelligent cooperative control.

The invention relates to a PFC-PWM (Pulse Width Modulation) dual-mode control method for a high-voltage direct-current power supply with a wide output voltage range. The output current of the high-voltage direct-current power supply is detected in real time, the critical threshold value of the load impedance is mapped into the hysteresis interval of the output current, the theoretical boundary of mode switching is obtained, and the control mode is dynamically adjusted. In order to further guarantee smooth switching of the two control modes, hysteresis control logic is designed, and undisturbed smooth switching of the PFM mode and the PWM mode is achieved. Based on an energy equivalence principle and a frequency consistency constraint of a critical load SWL working point, a current threshold criterion and a parameter pre-synchronization strategy are constructed, seamless connection of a mode switching process in a frequency domain and an energy domain is ensured, a transient oscillation risk is remarkably reduced, and a guarantee is provided for continuous and stable output of a full-range load working condition.

In a circuit element 10a, resonant circuits are arranged in parallel. A resonant capacitor Crkq of a q-th resonant circuit arranged in parallel has one end connected in series to a resonance reactor Lrq and a primary winding N1q of a transformer Trq. The resonant capacitor Crkq of the q-th resonance circuit arranged in parallel has another end connected to the resonant capacitor Crkq of a q-th one of the resonance circuit arranged in parallel in another one of the circuit elements 10a so that a k-dimensional multiphase LLC converter having a phase difference of 360° / Pk is constructed by Pk circuit elements.

A multi-phase LLC resonant converter circuit (10) includes: first to third LLC resonant converters each including a series circuit (S1 to S3) of a first switch and a second switch that are connected in parallel to a DC power supply, a high-frequency transformer (T1 to T3) including a primary-side winding and a secondary-side winding, a resonant circuit including a resonant reactor (Lr1 to Lr3) connected between a connection point of the first switch and the second switch and one end of the primary-side winding, a resonant capacitor (Cr1 to Cr3) in which one end is connected to the other end of the primary-side winding, and a divided resonant capacitor (Cn1 to Cn3) in which one end is connected to a connection point of the primary-side winding and the resonant capacitor; a first neutral line (N1) that connects the other end of the resonant capacitor; a neutral line reactor (Ln) connected between the first neutral line and a power supply line of the DC power supply; and a second neutral line (N2) that connects the other end of the divided resonant capacitor.

A power switching device is disclosed. The power switching device includes a cascode switching circuit comprising a normally-on transistor and a normally-off transistor provided in a cascode topology. The power switching device also includes a gate driver circuit configured to apply a positive bias voltage at a respective gate terminal of the normally-on transistor under a normal operating condition, and to apply a negative bias voltage at the respective gate terminal of the normally-on transistor under a short circuit condition.

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 TCM-mode-based Si-SiC hybrid power multi-phase staggered H-bridge converter structure and a control method thereof, according to the scheme, a three-phase staggered parallel topology of a two-phase low-frequency Si-IGBT bridge arm and a one-phase high-frequency SiC-MOSFET bridge arm is adopted, and a TCM control strategy is combined, so that zero voltage switching (ZVS) of a Si device is successfully realized, the switching loss is remarkably reduced, and the switching efficiency is improved. The system efficiency is greatly improved; and meanwhile, through pilot frequency interleaving and ripple compensation technologies, total output current ripples are greatly reduced, and optimal balance between system performance and manufacturing cost is realized while the power capacity of the converter is remarkably expanded and the dynamic response speed and the output electric energy quality are improved.

The power supply conversion circuit includes an isolation transformer, and the isolation transformer includes at least two primary coils and at least one secondary coil. Each primary coil is connected to a half-bridge circuit by using a first resonant network, and half-bridge circuits corresponding to the at least two primary coils are connected in series between two electrodes of a power supply. The half-bridge circuit is connected in parallel to a voltage divider, the voltage divider includes a first capacitor and a second capacitor that are connected in series, a first terminal of the first resonant network is connected to an intermediate node of the half-bridge circuit, and a second terminal of the first resonant network is connected to a connection point between the first capacitor and the second capacitor.

The invention discloses a wide-gain-range LLC resonant converter based on a variable voltage doubling rectifying structure, and belongs to the technical field of power electronic conversion. The converter comprises a primary side direct-current voltage input, a primary side full-bridge inversion structure, a resonant tank, a secondary side variable voltage doubling rectifying structure and an output load, the primary side full-bridge inversion structure comprises a left bridge arm and a right bridge arm which are formed by a switching tube Q1, a switching tube Q2, a switching tube Q3 and a switching tube Q4, and the resonant tank comprises a resonant inductor Lr, a resonant capacitor Cr and a transformer T; the secondary side variable voltage-multiplying rectifying structure comprises a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a switching tube Q5, a switching tube Q6, a switching tube Q7, a voltage-multiplying capacitor Cd1, a voltage-multiplying capacitor Cd2, an output capacitor Co1 and an output capacitor Co2. According to the invention, no extra resonant element is needed, the voltage gain range can be widened, the full-range working efficiency is improved, and new energy scene requirements are met.

A two-transistor flyback topology in which a portion of leakage inductance energy in the transformer is extracted and used to obtain zero voltage switching on both switching elements in any operating conditions, and in which a third low power switch eliminates parasitic oscillations and allows an operation at a determined frequency. In this topology, there are no switching losses and there are no spikes or glitches in any switching node, eliminating the need for snubbers. This topology is an “ideal two transistor flyback topology.”

The invention provides a power factor correction method and system for AC-DC conversion of a server power supply, and relates to the technical field of server power supplies, and the method comprises the steps: collecting an input AC signal and a DC bus output signal, calculating a real-time power factor value, constructing a compensation function based on the power factor value, and calculating a deviation value; and generating a compensation parameter matrix through recursive calculation, processing a direct current output signal by adopting an adaptive filtering algorithm, fusing the direct current output signal with the compensation parameter matrix, calculating to obtain a current adjusting signal and a duty ratio adjusting signal, and accurately adjusting a power factor.

The invention relates to an electromagnetic interference suppression method and device based on high-frequency GaN switching characteristics. The method comprises: in a power conversion circuit constructed based on a GaN switching device, edge analysis processing is performed on a driving signal of the GaN switching device to obtain edge feature data, and the edge feature data comprises a rising edge change rate and a falling edge change rate in a plurality of continuous switching periods; determining an equivalent network model constructed based on parasitic parameters in the power conversion circuit, and performing frequency domain response calculation on the equivalent network model according to the edge feature data, interference frequency band distribution information caused by the edge change is obtained, analysis processing based on spectrum energy adjustment is carried out on a driving signal of the GaN switching device according to the interference frequency band distribution information, and an adjustment control instruction used for restraining key frequency band interference is obtained. By adopting the method, an effective suppression strategy oriented to a specific interference frequency band can be realized.

A resonant capacitor Crk (k is a natural number of one to n) of each circuit element has one end connected in series to a resonant reactor Lr and a primary winding N1 of a transformer T, and another end connected to the resonant capacitor Crk of another circuit element 10 so that a dimensional multiphase LLC converter having a phase difference of 360° / Pk is constructed by Pk (Pk is an optional natural number) of the circuit elements 10.

Disclosed is an electronic circuit. The electronic circuit includes a first transistor device, a second transistor device, and a third transistor device, each having a control node and a load path. The electronic circuit further includes a drive circuit. The load paths of the first and second transistor devices are connected in parallel, the load path of the third transistor device is connected in series with the load paths of the first and second transistor devices, and the first transistor device and the second transistor device are integrated in a common semiconductor body. The drive circuit is configured, based on a control signal, to successively switch on the first transistor device and the second transistor device, so that the second transistor device is switched on when the first transistor device is in an on-state.

An electronic component. The electronic component includes a base; a first semiconductor device attached to the base and having: a first Gallium nitride (GaN)-based switch having a first gate, a first source and a first drain, the first gate arranged to control a current flow between the first source and the first drain; a second GaN-based switch having a second source, a second gate and a second drain, the second gate coupled to the first gate, and the second drain coupled to the first drain. In one aspect, the electronic component also includes a second semiconductor device attached to the base and having: a logic circuit coupled to the second source and arranged to detect a magnitude of the current flow; and a driver circuit coupled to the first and second gates, the driver circuit arranged to control on and off states of the first and second GaN-based switches.

The invention discloses a charge control method and a digital control system based on a dual-active bridge resonant converter, and belongs to the technical field of dual-active bridge resonant converter control. According to the method, a resettable integrating circuit is used for sampling resonance current and converting the resonance current into integrating voltage which is in a linear relation with charge injection quantity, and an integrating capacitor is discharged and reset before each time of injection; superposing the integral voltage and the ramp voltage; comparing the superposed signal with a threshold voltage output by a current loop through a comparator, and when the superposed signal reaches a threshold value, triggering to generate a PWM signal and switching the working mode of the converter; a switching tube is controlled to act according to a PWM signal, a switching time sequence is dynamically adjusted, effective control over transmission power is achieved, and a digital control system for achieving the method is established. According to the method, rapid dynamic response, efficient power transmission and stable operation of the dual-active bridge resonant converter are realized by controlling resonance current integration and a switching time sequence, and the energy conversion efficiency and the system reliability are effectively improved.

An alternating current (AC) impedance spectroscopy method includes providing an AC impedance spectroscopy ripple from power electronics into an electrochemical device, and absorbing the ripple in the power electronics.

The invention belongs to the technical field of LLC resonant converters, and provides an efficiency optimization method of a wide-range LLC resonant converter. The method comprises the following steps: firstly, obtaining a full-bridge LLC resonant converter topology and a working area; secondly, establishing a full-time-domain equation of the full-bridge LLC resonant converter topology in an inductive low-gain output working area, and setting boundary conditions of the full-time-domain equation; then, on the basis of boundary conditions, switching tube turn-off current is calculated, and the switching tube turn-off current is combined with switching tube switching frequency to be represented as switching tube turn-off loss characteristic quantity related to the inductance coefficient, the quality factor and the normalized frequency; then, carrying out characteristic analysis on the turn-off current of the switching tube, and setting constraint conditions; and finally, on the basis of the set constraint conditions, the optimal values of the inductance coefficient, the quality factor and the normalized frequency are calculated by combining a differential evolution algorithm, so that the turn-off loss of the switching tube is minimum. According to the invention, the transmission efficiency in a low-gain mode and a high-gain mode can be improved, and the turn-off loss of the switching tube is reduced.

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).

A power supply includes an active power factor correction circuit, a resonant converting circuit, a zero-current detecting circuit and a control circuit. The control circuit provides a first control signal for operating the active power factor correction circuit, and provides second and third control signals for operating the resonant converting circuit. The zero-current detecting circuit monitors the status of boost inductor current in the active power factor correction circuit. When the boost inductor current is not in a zero-current state, the resonant converting circuit is configured to operate in a single-element resonant mode. When the boost inductor current is in the zero-current state, the resonant converting circuit is configured to operate in a multi-element resonant mode, thereby reducing overall resonation energy and resonation loss.

The invention discloses a bidirectional CLLC resonant converter with a wide input and output voltage range, and relates to the technical field of bidirectional DC / DC converters in the field of switching power supplies. According to the bidirectional CLLC resonant converter, bidirectional switching bridge arms are added to a primary circuit and a secondary circuit in a conversion main circuit respectively; the control circuit performs pulse frequency control on a switching tube in the LLC resonant network and also performs duty ratio control on the bidirectional switching bridge arm circuit, so that the gain range of the resonant converter can be further widened on the basis of performing pulse frequency control on the LLC resonant network, and meanwhile, the whole-process soft switching can be realized, and the reliability of the resonant converter is improved. And the efficiency of the converter is improved.

The invention belongs to the technical field of power distribution, and discloses a direct current transformer soft switch and a control method.The direct current transformer soft switch comprises a medium-voltage direct current bus and low-voltage direct current buses, the medium-voltage direct current bus is electrically connected with a modular multi-level multi-port direct current converter, and the modular multi-level multi-port direct current converter is electrically connected with a plurality of low-voltage direct current converters; the plurality of low-voltage direct-current converters are electrically connected with a low-voltage direct-current bus and are used for realizing bidirectional power transmission from medium-voltage direct current to low-voltage direct current; according to the method, the medium-voltage side inductance value is reduced, the medium-voltage side current ripple is enabled to pass zero, the M3DC operates in an approximate critical conduction mode, a constant valley current control strategy is adopted, the minimum value of the medium-voltage side inductance current is controlled to be constant under different working conditions, and then zero-voltage switching-on of a switching device in a wide operation range and zero-current switching-off of an anti-parallel diode are achieved.

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.

A multi-phase power converter converts an input voltage into an output voltage to supply power to a load, and the multi-phase power includes at least two power conversion circuits, a driver circuit and a controller. The controller is configured to determine a loading condition of the multi-phase power converter according to at least one of an input current and an output current of the multi-phase power converter. When the controller determines the loading condition is not a heavy-loading condition, the controller configures the driver circuit to alternatively drive the power conversion circuits to converter the input voltage into the output voltage; the controller disables the driver circuit when the input current of the multi-phase power converter is lower than a predetermined threshold, and the controller enables the driver circuit to alternatively drive the power conversion circuits when the input current is greater than the predetermined threshold.

The invention is suitable for the technical field of resonant converters, and provides a starting control circuit and a resonant converter. The starting control circuit comprises a feedback module, a comparison selection module and a logical operation module, the comparison selection module is electrically connected with the feedback module and the logical operation module, the feedback module is used for being electrically connected with the output end of a resonant conversion circuit in the resonant converter, and the logical operation module is used for being electrically connected with a driving circuit in the resonant converter. According to the starting control circuit provided by the embodiment of the invention, the resonant capacitor voltage constraint threshold value which is gradually enlarged along with the starting process can be constructed, smooth establishment of resonant capacitor direct current bias is realized, the fluctuation amplitude of the resonant capacitor voltage is limited, the problem that the total bus voltage is applied to the resonant inductor in a traditional scheme is avoided, and the starting control circuit is suitable for a high-voltage power supply. Finally, the resonance current peak value in the starting stage is effectively suppressed, and the impact of current stress on core devices such as a switching tube and a resonance inductor is reduced.

The invention belongs to the technical field of power electronics, and particularly discloses a high-stability and high-dynamic-performance high-voltage power supply which comprises a main circuit, a detection circuit and a control circuit. The main circuit comprises a first LCC resonant converter module, a second LCC resonant converter module and a follow current resistor; the control circuit is used for taking the output voltage of the n LCC resonant converter sub-modules as a control quantity and changing the driving signal frequency, phase and duty ratio of the LCC resonant converter sub-modules; and the driving signal frequency, the phase and the duty ratio of the second LCC resonant converter module are obtained according to the driving signal frequency, the phase and the duty ratio of the n LCC resonant converter sub-modules, so that the output voltage amplitude of the second LCC resonant converter module is equal to the output voltage ripple amplitude of the first LCC resonant converter module. The high stability of the output voltage can be ensured while the response speed of the output voltage can be greatly improved.

The embodiment of the invention provides an interlaced PFC circuit and a phase locking method of the interlaced PFC circuit, the interlaced PFC circuit comprises n PFC circuits, n driving circuits and a processor, and the n PFC circuits comprise a main phase PFC circuit and a slave phase PFC circuit. The phase locking method comprises the steps that a processor obtains a master phase driving signal input to a master phase PFC circuit and obtains a slave phase driving signal input to a slave phase PFC circuit; capturing a first rising edge of the slave phase driving signal after the first rising edge of the master phase driving signal occurs to obtain first time; capturing a second rising edge of the master phase driving signal after the first rising edge of the slave phase driving signal occurs to obtain a second time; and controlling the conduction duration of the slave phase driving signal according to the difference value between the first time and the second time. Therefore, quick closed-loop phase locking of the multi-phase interleaving parallel circuit is realized, full-range quick phase locking is realized under the conditions of non-valley bottom opening and valley bottom opening, meanwhile, the circuit design is simplified, and accurate phase locking can be realized without redundant hardware circuits.

A coil apparatus includes a coil unit including a coil, a base core that is a first core component, and a core module that is a second core component. The first core component includes a center leg that is a leg around which the coil is wound. The second core component includes a plurality of core segments arranged in a row with gaps between them. The second core component is connected to the leg to form a magnetic path together with the first core component.

The invention relates to the technical field of switching power supplies, in particular to a self-locking flyback switching power supply circuit with overcurrent and overvoltage protection, which comprises a primary side control circuit, a power conversion circuit, a synchronous rectification circuit and an output circuit, and is characterized in that a self-locking circuit is electrically connected with an overvoltage detection circuit and an overcurrent detection circuit; wherein the over-current detection circuit is used for detecting whether output current exceeds rated current or not; the overvoltage detection circuit is used for detecting whether the output voltage exceeds the rated voltage; and the self-locking circuit is used for pulling down the starting voltage of the primary side control circuit and the synchronous rectification circuit to a low level when the output overvoltage or overcurrent is detected, so that the power conversion circuit stops working until the input voltage is disconnected. According to the invention, the defects of response speed, protection precision, cost and adaptability in over-current and over-voltage protection of the existing flyback switching power supply are overcome.

A method of operating a PFC circuit. The method includes receiving an input voltage at an input terminal, controlling a current in an inductor via a first switch having a drain terminal, a source terminal and a gate terminal, where the inductor is coupled between the input terminal and the drain terminal and where during an on-time of the first switch the current in the inductor increases from substantially zero to a peak, during a first off-time of the first switch the current in the inductor decreases from the peak to substantially zero, and during a second off-time of the first switch the current in the inductor is substantially zero, generating a first reference voltage that is inversely proportional to a sum of the on-time and the first off-time of the first switch, and controlling the on-time of the first switch in response to the first reference voltage.