1137 results about "Half bridge" patented technology

Disclosed in the present invention is a packaging structure of a half-bridge power module. The packaging structure comprises an insulating and thermal conductive plate, a multi-layer circuit board, a plastic package body and a bridge arm switch. Further disclosed in the present invention is the use of a packaging structure of a half-bridge power module in an OBC power source converter, a DCDC isolated converter, a non-isolated power source converter, a cardiac arrest awakening apparatus, and a circuit module formed by means of combining multiple half bridges such as ANPC, TNPC and Heric. Further disclosed in the present invention is a manufacturing method for a packaging structure of a half-bridge power module. The method comprises: performing assembling; providing an overflow region; and synchronously performing filling and grinding to remove the overflow region. In the present invention, a minimum size and a low impedance are achieved by means of DBC, flexible pin leading-out and welding are realized by means of a PCB, the reliability, safety and heat dissipation of modules are supported by means of a plastic packaging body, and the extension of a temperature monitoring unit and a decoupling capacitor is supported.

The present invention discloses a prediction method for a crosstalk spike in a half bridge of current-source inverter with silicon carbide devices, where, the prediction method includes calculation of the crosstalk voltage spike in the circuit of current-source type double-pulse test and analysis of the effect of each parameter on the magnitude of the crosstalk spike. The prediction method of the present invention analyzes the horizontal conduction crosstalk mechanism between the gate-source junction of the MOSFET caused by the high-frequency switching action of the silicon carbide (SiC) MOSFET and the SiC Schottky diode connected in series, and derives the prediction model for the crosstalk voltage spike in the half-bridge of current-source inverter. Based on the equivalent circuit of the current-source-type double-pulse test and the crosstalk-induced mechanism, the extreme value of crosstalk voltage spike is accurately predicted, which is helpful to analyze the effects of the drive circuit and the parameters of the power circuit on the crosstalk voltage spike through the prediction model.

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 relates to a half-bridge switch arrangement with a plurality of parallel-connected half-bridges, each half-bridge comprising a first semiconductor switching element and a second semiconductor switching element, comprising: a plurality of half-bridge units (100), each half-bridge unit comprising one of the first semiconductor switching elements (110), one of the second semiconductor switching elements (120), and a support element, wherein the respective first semiconductor switching element (110) and the respective second semiconductor switching element (120) are arranged on the respective support element, a heat sink (180), wherein the plurality of half-bridge units (100) are in thermal contact with the heat sink (180), a first busbar to which a first terminal of each of the first semiconductor switching elements (110) of the plurality of half-bridge units (100) is electrically connected, a second busbar,a third busbar, to which a second terminal of each of the first semiconductor switching elements (110) of the plurality of half-bridge units (100) and a first terminal of each of the second semiconductor switching elements (120) of the plurality of half-bridge units (100) are electrically connected, a third busbar, to which a second terminal of each of the second semiconductor switching elements (20) of the plurality of half-bridge units (100) is electrically connected.

The present application discloses an injection system for a die casting machine, which includes an accumulator, an injection cylinder, a pressurization cylinder and a valve module connected via an oil pipeline; in a slow injection phase of the injection cylinder, the valve module is adapted for dynamic switching between a phase of an oil pump of the oil pipeline supplying oil alone and a phase of the oil pump and the accumulator jointly supplying oil; in a fast injection phase, a braking phase, a tracking phase and a pressurization injection phase, the oil pump of the oil pipeline and an oil tank form a first A-type half-bridge structure.

An in-vehicle charging device that includes an AC-DC converter that converts power between AC power on the external AC power supply side and first DC power; and a DC-DC converter that converts power between the first DC power and second DC power on the DC power supply side, wherein the AC-DC converter includes a current source active rectifier having a power factor correct function, the DC-DC converter includes a chopper circuit including a reactor disposed on the AC-DC converter side and a half-bridge circuit disposed on the DC power supply side, the reactor is configured using a plurality of the coils, the half-bridge circuit is configured using the inverter, and the current source active rectifier includes a bidirectional switching device.

A kind of power device parallel type power module and capacitor charging and discharging method, power module includes two or more than pressure type power device, the two or more than pressure type power device adopts the physical form of half bridge group string upper and lower parallel;The half bridge group string of the pressure type power device is connected in parallel by silicon pile composite busbar;Each power module is provided with pneumatic short-circuit switch, in the case of multiple power module series connection, the pneumatic short-circuit switch is connected in series with all DC capacitors, and charging and discharging is carried out through the ground loop of flexible AC transmission equipment AC, DC valve side;The pneumatic short-circuit switch is connected with gas driving pipeline, and the gas driving pipeline is connected with valve-based gas pressurizing device.The power module can effectively improve the capacity of flexible AC transmission equipment, so that it has short-time frequency modulation capacity output, provides technical scheme support for new power system construction, and guarantees system safety and stability;The provided capacitor charging and discharging method can improve maintenance efficiency and enhance product reliability.

A control circuit is provided, for controlling switching elements of an asymmetric half bridge (AHB) converter. The AHB converter includes a first switching element, a second switching element, a capacitor, and a transformer having a primary side and a secondary side. The control circuit includes a first output, for controlling the first switching element; and a second output, for controlling the second switching element. The control circuit also includes control logic, configured to generate a first pulse width modulated, PWM, control signal at the first output and a second PWM control signal at the second output. The control logic may have a first operation mode in which it is configured to cause a magnetizing current of the transformer to remain greater than zero throughout a switching period of the first and second PWM control signals.

A dynamic on-resistance and threshold voltage instability evaluation circuit for power devices and its operation method thereof are provided. The evaluation circuit includes a first switch element and a device under test which forms a half bridge circuit, an RL load, as well as a second switch element in parallel with a capacitor. The device under test is connected as a lower switch of the half bridge circuit. And the RL load enables repetitive hard switching operation of the device under test for dynamic on-resistance measurement. The second switch element in parallel with the capacitor enables threshold voltage measurement of the device under test. By adopting the circuit to characterize both instabilities of dynamic on-resistance and gate threshold voltage, the present invention is beneficial to achieving in shorter pulse width, faster measuring speed and inexpensive measuring equipment, and can thus be widely applied to group III-N based power devices.

The embodiment of the invention provides a control method and control circuit of a half-bridge flyback converter, a chip and power supply equipment. The control method comprises the steps that when the half-bridge flyback converter works in a free resonance state, in a first switching period, the second primary switching tube is controlled to be switched on so that the half-bridge flyback converter can exit from the free resonance state, after a preset switching-on duration, the second primary switching tube is controlled to be switched off so that excitation current can be negative current, and the half-bridge flyback converter can be switched off. And the half-bridge flyback converter enters the free resonance state again, and the first primary switch tube is controlled to be switched on at the moment which is separated from the switching-off moment of the second primary switch tube by odd number times of the free resonance half cycle, so that the valley bottom of the first primary switch tube is switched on, the efficiency of the half-bridge flyback converter can be improved, and the service life of the half-bridge flyback converter is prolonged. And the peak stress when the secondary switch tube is turned off can be reduced, so that the EMI of the half-bridge flyback converter is improved.

The utility model relates to the technical field of chip packaging, and particularly discloses a multi-chip parallel half-bridge packaging structure, which comprises a DBC (Direct Bonding Copper) substrate, the DBC substrate is provided with a circuit layer, the circuit layer comprises A-area copper foils and B-area copper foils, the A-area copper foils comprise cathode DC-copper foils and lower-bridge AC copper foils positioned on two sides of the cathode DC-copper foils, and the B-area copper foils are positioned on two sides of the cathode DC-copper foils. The B-area copper foil comprises a positive electrode DC + copper foil and upper-bridge AC copper foils located on the two sides of the positive electrode DC + copper foil, the A-area copper foil and the B-area copper foil are symmetrically arranged, the B-area copper foil comprises an upper-bridge grid driving copper foil and an upper-bridge auxiliary source driving copper foil, and the A-area copper foil comprises a lower-bridge grid driving copper foil and a lower-bridge auxiliary source driving copper foil. According to the utility model, the through-current capability of the module can be improved, the parasitic inductance of a main loop is small, the current intensity from current to a chip is improved, and the packaging structure is realizable, low in cost and high in reliability.

The invention discloses a regulation and control method of a DC-DC electric energy converter for an LED driving power supply. A semi-active resonant converter of which the primary side is a controllable full bridge and the secondary side is a half-controlled half bridge is used; based on the topological structure, an unbalanced variable pulse width modulation method is applied, an inner phase shift angle alpha is introduced to a primary side, and an outer phase shift angle phi is introduced to a secondary side; the optimal working mode operation condition is obtained through mode analysis; obtaining an equivalent power model through a fundamental wave approximation method; and applying a path optimization control strategy on the basis, and outputting an optimal path track of the converter to obtain an optimal control scheme. According to the invention, the converter can realize full-soft switching operation in a full-load range, the switching loss is reduced, the converter operates in an optimal path track, the circulating power is reduced, the stability of output electric energy is improved, and the efficient operation of the system is ensured.

The embodiment of the invention provides a half-bridge flyback converter, a control method thereof, a control circuit and a chip. The control method comprises the steps that when the half-bridge flyback converter works in a free resonance state, in a first switching period, a second primary switching tube is controlled to be conducted for a first time length, and according to sampling voltage information of a secondary power loop, after it is detected that the second primary switching tube is conducted, a secondary switching tube is controlled to be conducted for a second time length, the half-bridge flyback converter can perform reverse excitation so as to generate negative excitation current, the zero voltage at the two ends of the first primary switch tube is reduced to zero, and when the first primary switch tube is controlled to be switched on, zero-voltage switching-on of the first primary switch tube can be realized. According to the method, the noise of the half-bridge flyback converter can be reduced, and zero-voltage switching-on of the first primary switching tube can be realized under the DCM of the wide-range output voltage of the half-bridge flyback converter, so that the efficiency of the half-bridge flyback converter under the DCM is improved.

The invention discloses a driving circuit and a half-bridge driving circuit which are used for driving a target power tube, and the circuit comprises a floating rail circuit which is connected between a first node and a second node and is used for generating a floating voltage and a clamping voltage; the control signal generating circuit is connected between the first node and the floating voltage and generates a control signal based on the PWM signal. The gate driving circuit is connected between the first node and the second node, is connected with the clamping voltage, and is used for generating a target driving signal based on the plurality of control signals so as to drive the target power tube. Floating voltage is generated through the floating rail circuit, so that the control signal generation circuit works in a floating voltage domain, and the risk that a high-voltage tube is broken down is avoided; a clamping voltage is generated through the floating rail circuit, so that an output tube of the gate drive circuit can adopt a low-voltage tube, and the reaction speed of the gate drive circuit is increased; half-bridge driving can be realized based on two groups of floating rail circuits, and the circuit area is saved.

The invention discloses an active battery equalization system and method, and belongs to the field of line detection. The system comprises a monitoring module, a microcontroller, a battery pack, a switch array and a half-bridge LLC converter. The microcontroller is used for receiving the voltage sampling value and the current sampling value acquired by the monitoring module; calculating the average charge state of the battery pack and the charge state of each single battery according to the voltage sampling value and the current sampling value; comparing a difference value between the average charge state of the battery pack and the charge state of the current single battery with a preset balance threshold value, and judging whether an unbalanced battery exists or not; and under the condition that the unbalanced battery exists, the switch array is controlled to gate the unbalanced battery to the input end of the half-bridge LLC converter, and the half-bridge LLC converter is controlled to perform energy conversion, so that the unbalanced battery performs energy transmission with other batteries of the battery pack through the half-bridge LLC converter. By implementing the invention, the problems of high cost and low balancing speed in the prior art can be solved.

A resonant asymmetrical half-bridge flyback power converter includes: a first transistor and a second transistor switching a transformer coupled to a capacitor for generating an output power; a voltage divider coupled to an auxiliary winding of the transformer; a differential sensing circuit which includes a first terminal and a second terminal coupled to the voltage divider to sense an auxiliary signal generated by the auxiliary winding for generating a peak signal and a demagnetization-time signal; and a PWM control circuit configured to generate a first PWM signal and a second PWM signal in accordance with the peak signal and the demagnetization-time signal, for controlling the first transistor and the second transistor respectively; wherein a period of an enabling state of the demagnetization-time signal is correlated to the output power level; wherein the peak signal is related to a quasi-resonance of the transformer after the transformer is demagnetized.

The invention discloses a single-stage high-power-factor LED driving power supply, and relates to the technical field of power supply systems. The circuit comprises a bridgeless Boost power factor correction (PFC) circuit and an LCC half-bridge resonant converter. The bridgeless Boost power factor correction (PFC) circuit comprises vin, Lf, Cb, two diodes D1 and D2 and two metal oxide semiconductor (MOS) switch tubes S1 and S2. The LCC half-bridge resonant converter comprises two MOS switch tubes S1 and S2, two diodes D3 and D4, a series resonant capacitor Cr, a parallel resonant capacitor Cp and a series resonant inductor Ls. Vin is an alternating current mains supply input voltage of the bridgeless Boost power factor correction PFC circuit; according to the LED driving power supply circuit, the bridgeless Boost power factor correction (PFC) circuit and the LCC half-bridge resonant conversion circuit are integrated together through the switching tube sharing technology, and the LED driving power supply circuit has the advantages that only one set of controller is needed, the control logic is simple, the number of used electronic components is small, the cost is low, and the reliability is high.

The invention discloses a packaging structure of a half-bridge power module. The packaging structure comprises an insulating heat-conducting plate, a multi-layer circuit board, a plastic packaging body and a bridge arm switch, on the other hand, the invention discloses application of the packaging structure of the half-bridge power module in a vehicle-mounted OBC power converter, a DCDC isolation converter, a non-isolation power converter, a cardiac arrest wake-up device and a circuit module formed by combining multiple half bridges such as ANPC, TNPC and Heric. The invention further discloses a manufacturing method of the packaging structure of the half-bridge power module. The manufacturing method comprises the steps of assembling, arranging the overflow area and synchronously filling and grinding to remove the overflow area. The minimum size and low impedance are achieved through the DBC, flexible pin outgoing and welding are achieved through the PCB, the reliability, safety and heat dissipation of the module are supported through the plastic package body, and the expansion temperature monitoring unit and the decoupling capacitor are supported.

The invention relates to the technical field of high-voltage cascade energy storage systems, and discloses a high-voltage cascade energy storage system based on nested power modules and a control method thereof.The high-voltage cascade energy storage system comprises three phases of chain type energy storage bridge arms connected with three phase lines of a power grid respectively, and each phase of chain type energy storage bridge arm comprises a plurality of cascaded nested power modules; each nested power module comprises a plurality of direct-current chain type energy storage units and an H-bridge circuit, the plurality of direct-current chain type energy storage units are connected in parallel and then are connected with the direct-current side of the H-bridge circuit, and the alternating-current side of the H-bridge circuit is connected with an alternating-current switch; the direct current chain type energy storage unit comprises a plurality of energy storage modules, an electric reactor and a direct current switch, the plurality of energy storage modules are cascaded and then are sequentially connected with the electric reactor and the direct current switch, each energy storage module comprises a battery pack and a half-bridge circuit connected with the battery pack, and the half-bridge circuit is used for charge state balance control of the battery pack. According to the invention, any battery pack can be bypassed after a fault, and the operation reliability of the high-voltage cascade energy storage system is improved.

The invention belongs to the field of crimping IGBT junction temperature estimation, and particularly discloses a crimping IGBT half-bridge module junction temperature online estimation method and system, and the method comprises the steps: carrying out the decoupling of a double-side thermal network model based on a multi-heat-flow path of a crimping IGBT half-bridge module, and achieving the junction temperature estimation of the crimping IGBT half-bridge module; wherein the establishment method of the double-sided thermal network model comprises the step of constructing the double-sided thermal network model based on the double-sided junction-to-case thermal resistance, the water-cooled radiator thermal resistance, the circulating water equivalent thermal resistance and the coupling thermal resistance of the crimping IGBT half-bridge module by taking the water inlet temperature of the water-cooled radiator as the reference temperature and combining the power loss of each crimping IGBT in the crimping IGBT half-bridge module. The method has research value and application prospect for junction temperature estimation and reliability evaluation of the converter valve crimping IGBT.

Systems, devices, and methods are provided for pulsed strain gauge topologies. A weight sensor assembly may comprise one or more load cells for receiving excitation pulses during a first state period of a duty cycle, sample and hold (S / H) circuitry connected to the one or more load cells that holds analog measurement signals from the one or more load cells, first filtering circuitry connected to the S / H circuitry for processing the analog measurement signals and producing a DC level signal, an amplification system connected to the filtering circuitry, for amplifying the DC level signal, second filtering circuitry connected to the amplification system for filtering power line noise, and analog-to-digital (ADC) circuitry connected to the second filtering circuitry. Examples of load cells described herein include full-bride load cells (FBLCs) and half-bridge load cells (HBLCs).

A power converter, power converter controller, and method of controlling a power converter are described. The power converter includes: a half bridge or full bridge switch network; an LLC resonant tank electrically coupled to the switch network; a rectifier circuit electrically coupled to a filter capacitor configured to provide a DC output voltage; a transformer inductively coupling the rectifier circuit to the LLC resonant tank; and a controller configured to determine a reference voltage to which the DC output voltage is regulated, and adjust a switching frequency of the switch network based on a difference between the DC output voltage and the reference voltage. The controller is configured to determine the reference voltage based on input voltage and / or output current feedback for the power converter and / or determine a variable switching frequency or a variable switching period for the switch network based on input voltage magnitude and output current magnitude.

The invention provides a positive polarity square wave power supply circuit, a test device of a to-be-tested device and a power supply method.The positive polarity square wave power supply circuit comprises a square wave generation unit, and the square wave generation unit comprises a plurality of cascaded half-bridge structures; each half-bridge structure comprises a high-voltage direct-current power supply, an energy storage module, a first switch module located on the first bridge wall and a second switch module located on the second bridge wall, and the high-voltage direct-current power supply and the energy storage module are connected in parallel. The power supply circuit is simple in structure and good in expandability, all the stages are mutually independent, waveform parameters of output square waves can be flexibly adjusted, the power supply circuit is suitable for being used as a positive polarity square wave power supply circuit for high-voltage SiC packaging insulation assessment, and the problem that a high-voltage positive polarity square wave power supply for high-voltage SiC packaging insulation assessment is lacked in the prior art is solved. Therefore, the problem that the partial discharge inside the high-voltage silicon carbide device exposed under the positive polarity square wave voltage cannot be fully evaluated is solved.

The invention relates to a half-bridge switch arrangement (200) with a plurality of parallel-connected half-bridges (150), wherein each half-bridge (150) comprises a first semiconductor switching element (110) and a second semiconductor switching element (120), comprising: a plurality of switch units (100), wherein each switch unit comprises a semiconductor switching element (101) and a support element (106), wherein the respective semiconductor switching element (101) is arranged on the respective support element (106), wherein each switch unit (100) is provided as a separate assembly prior to its arrangement in the half-bridge switch arrangement (200).wherein in a first number (100') of the plurality of switch units (100) the respective semiconductor switching element (101) is configured as one of the first semiconductor switching elements (110) and wherein in a second number (100") of the plurality of switch units (100) the respective semiconductor switching element (101) is configured as one of the second semiconductor switching elements (120), a heat sink (280) wherein the plurality of switch units (100) are in thermal contact with the heat sink (280), a first busbar (230) to which a first terminal of each of the individual first semiconductor switching elements (110) of the first number (101') of switch units (100) is electrically connected, a second busbar (270),a third busbar (40, 240) with which each second terminal of the individual first semiconductor switching elements (110) of the first number (101') of switch units (100) and each first terminal of the individual second semiconductor switching elements (120) of the second number (101") of switch units (100) is electrically connected, a third busbar (40, 240) with which each second terminal of the individual second semiconductor switching elements (21, 120) of the second number (101") of switch units (100) is electrically connected.

A lamp driver has a transformer, a primary side circuit and a secondary side circuit. The primary side circuit comprises a half bridge circuit and a sensor circuit for measuring a conduction time or switching frequency of one of the transistors of the half bridge circuit. An estimate is provided of the output voltage from the measured conduction time.

The invention provides a hybrid modular multilevel converter and an active arc extinction regulation and control method. The hybrid modular multilevel converter comprises a three-phase full-bridge and half-bridge hybrid modular multilevel converter. The first zero-sequence current path module and the second zero-sequence current path module are connected between the positive electrode of the direct-current side of the three-phase full-bridge half-bridge hybrid modular multilevel converter and the ground and between the negative electrode of the direct-current side of the three-phase full-bridge half-bridge hybrid modular multilevel converter and the ground, and provide paths for zero-sequence current required by arc extinction; and the full-bridge sub-module cascade string is connected to positive and negative direct-current buses of the three-phase full-bridge and half-bridge hybrid modular multilevel converter. According to the active arc extinction regulation and control method, after the hybrid modular multilevel converter detects that a power distribution network breaks down, a voltage arc extinction method is adopted, proportional resonance (PRC) control is carried out on a 0 axis, MMC is controlled to output zero-sequence voltage, and the zero-sequence voltage of a system is regulated and controlled, so that the fault phase voltage is reduced to zero, and the fault current is reduced to zero; and the fault current is transferred to the DC side grounding branch.

The invention relates to an electrical machine unit (160) comprising an electrical machine (130) and a power converter (140), wherein the electrical machine has several regular phase windings and an additional inductance (136X), the additional inductance being connected to at least one of the several regular phase windings, the power converter comprising several half-bridges, each of which is connected to one of the several regular phase windings of the electrical machine, the electrical machine unit comprising DC terminals (B+, B-) for connection to an energy storage device (150) and DC-side switches (180+, 180-), the DC-side terminals (146+, 146-) of the several half-bridges being connected to each other and each being connectable to or disconnectable from a respective DC terminal via one of the DC-side switches.wherein the electrical machine unit has first DC charging terminals (172.1+, 172.1-) wherein the additional inductance is connected to one of the first DC charging terminals and one side of the DC-side terminals of the multiple half-bridges is connected to another of the first charging terminals, wherein the electrical machine unit has second DC charging terminals (172.2+, 172.2-) wherein the DC-side terminals are connected to one of the second charging terminals respectively.

The invention discloses a BUCK-BOOST multi-stage half-bridge circuit series aging topological structure and a control method, and in the topological structure, a front-stage BUCK circuit and a rear-stage BOOST circuit are symmetrically designed by taking a voltage-stabilizing energy-storage capacitor as a center; the pre-stage BUCK circuit comprises a plurality of BUCK half-bridge units which are cascaded in sequence, and the post-stage BOOST circuit comprises a plurality of BOOST half-bridge units which are cascaded in sequence; the BUCK half-bridge unit and the BOOST half-bridge unit have the same circuit structure and each comprise an upper bridge arm and a lower bridge arm; in the BUCK half-bridge unit, an upper bridge arm switch and a lower bridge arm switch are connected to the output end of the upper stage, and an inductor L and the negative end of a lower bridge arm are connected to the input end of the lower stage; in the BOOST half-bridge unit, the inductor L and the negative end of the lower bridge arm are connected to the output end of the upper stage, and the upper bridge arm switch and the lower bridge arm switch are connected to the input end of the lower stage. According to the invention, cascade aging of BUCK and BOOST is realized, the aging efficiency is greatly improved, the energy loss is reduced, the cost is saved, the cascade aging is closer to system operation, the verification is more sufficient, and the working condition coverage is larger.

The invention discloses a gallium nitride hybrid switched capacitor voltage converter with a high step-down ratio, which belongs to the technical field of switching power supplies and comprises an input filtering module, a switched capacitor module group, a half-bridge module group and an output filtering module which are connected in sequence, the switched capacitor module group comprises a plurality of switched capacitor modules which are connected in parallel, the half-bridge module group comprises a plurality of half-bridge modules which are connected in parallel, and the switched capacitor modules and the half-bridge modules are in one-to-one correspondence and work in corresponding preset switching periods; the output filtering module comprises a plurality of output filtering inductors, and the output filtering inductors are correspondingly connected with the half-bridge modules. Through innovation of the topological structure, the buck ratio higher than that of a traditional Buck converter under the same duty ratio is achieved, input current and output voltage ripples are further improved through a multi-phase interleaving parallel control mode, wide bandgap devices are reasonably selected for the innovatively-designed topological structure, and therefore the output current and output voltage ripples are improved. And the circuit is more suitable for kilowatt-level switching power supply equipment.

The invention discloses a circuit topology design method for a single-stage AC-DC converter, and relates to the technical field of power supply systems, and a totem-pole bridgeless Boost power factor correction circuit and an LCC half-bridge resonant converter with current-doubling synchronous rectification are integrated together through a switching tube sharing technology. Wherein the totem pole bridgeless Boost power factor correction PFC circuit comprises vin, Lf, Cb, two diodes D1 and D2, and two MOS switch tubes S1 and S2; the front stage of the LCC half-bridge resonant converter comprises two MOS switch tubes S1 and S2, a series resonant capacitor Cr, a parallel resonant capacitor Cp and a series resonant inductor Ls. The single-stage AC-DC converter circuit topology provided by the invention has the advantages that the preceding stage only needs one set of controller, the control logic is simple, the number of used electronic components is small, the cost is low, the efficiency is high and the reliability is high; and the backward stage is provided with the current-doubling synchronous rectification circuit, so that the single-stage AC-DC converter circuit topology has the advantages of being high in efficiency, small in loss and suitable for a large-current output occasion.