92 results about "Rectifier diodes" patented technology

The invention discloses a high-voltage high-power cascade converter which comprises rectifier diodes, a direct-current input bar, an IGBT device, a low-inductance busbar, a cascade output bar, a radiator, a cover plate, a shell assembly and a control assembly. The fuse and the supporting capacitor are detachably connected with the converter through the low-inductance busbar. The radiator is located at the bottom of the shell assembly, a cooling medium connector is arranged on the side portion of the radiator, and the cover plate is used for sealing the top of the shell assembly. The plurality of rectifier diodes and the plurality of IGBT devices are installed on the radiator, and the low-inductance busbar is used for connecting terminals of corresponding polarities of the rectifier diodes and the IGBT devices; the direct current input bar and the cascade output bar are both located above the IGBT device and are arranged in a staggered manner; the DC input bar is connected with the support capacitor through the low-inductance busbar. The cascade output bar adopts a copper bar mode; the control assembly is located above the cascade output row. The invention has the advantages of compact structure, convenience in maintenance, high power and the like.

This disclosure presents an embodiment of a power supply device for a submarine data center. One specific embodiment of the power supply device includes a pre-stage voltage regulator / conversion component, a post-stage DC-DC converter component, and a combined protection circuit. The pre-stage voltage regulator / conversion component includes several parallel single-group voltage regulator branches, each branch connected in series with a varistor and a color-coded resistor. A thin-film capacitor is connected in parallel to the output terminal of the pre-stage voltage regulator / conversion component. The post-stage DC-DC converter component, electrically connected to the pre-stage voltage regulator / conversion component, includes at least two sets of full-bridge DC synchronous rectifier circuits. The combined protection circuit includes a pre-stage combined protection circuit, a post-stage active voltage clamping circuit connected in parallel to the output side of the post-stage DC-DC converter component, and a rectifier diode bridge connected between the constant current input port and the pre-stage voltage regulator / conversion component. The pre-stage combined protection circuit is connected in series to the input side of the rectifier diode bridge. By connecting multiple voltage regulator branches in parallel and combining them with the combined protection circuit, ripple is reduced. This embodiment can improve the power supply stability of the power supply device.

This invention provides a switching power supply, an AC-DC circuit, an input voltage detection circuit, and a method. The first end of the secondary coil of a transformer is connected to the anode of a rectifier diode, and the cathode of the rectifier diode is connected to the positive terminal of a filter capacitor. The second end of the secondary coil of the transformer, the negative terminal of the filter capacitor, and the positive terminal of the sampling capacitor are all grounded. The cathode of the diode is connected to the first end of the secondary coil of the transformer, and the anode is connected to the negative terminal of the sampling capacitor. The negative terminal of the sampling capacitor is grounded sequentially through a third sampling resistor and a second sampling resistor. The common terminal of the third and second sampling resistors is connected to a voltage detection terminal and, through a first sampling resistor, to a reference voltage input terminal. A reference voltage is input to the reference voltage input terminal. The control unit detects the voltage at the voltage detection terminal and calculates the magnitude of the input AC voltage based on the relationship between the AC voltage and the voltage at the voltage detection terminal.

The invention discloses an integrated rectifier diode module of a three-dimensional spiral structure, and relates to the technical field of power semiconductor devices, the integrated rectifier diode module of the three-dimensional spiral structure comprises an electrical function unit and a thermal management unit which are integrated in a monolithic mode, and the electrical function unit and the thermal management unit are coaxially arranged to achieve electric-thermal collaborative optimization. The specific structure is as follows: the electrical function unit comprises a substrate layer, an N + GaN conduction layer, an N-GaN drift layer and a three-dimensional spiral super-junction structure embedded in the N-GaN drift layer, the substrate layer, the N + GaN conduction layer, the N-GaN drift layer and the three-dimensional spiral super-junction structure are sequentially stacked from bottom to top, the three-dimensional spiral super-junction structure is formed by alternately and spirally arranging P-NiO regions and N-GaN regions, and charge balance is achieved; the electrical function unit further comprises an anode electrode and a cathode electrode, the anode electrode is arranged at the top of the three-dimensional spiral super-junction structure, and the cathode electrode is arranged on the surface of the N + GaN conduction layer; according to the invention, the power density is improved, the high-power application requirement is met, the device is suitable for the high-power-density field, the environmental adaptability is high, and the stable performance can be kept at different working temperatures.

The utility model discloses a secondary overlapped multi-group series rectification output circuit of a switching power supply. The secondary overlapped multi-group series rectification output circuit comprises a transformer and at least three series rectification circuits electrically connected with the transformer, each rectification circuit comprises a rectification diode, an RC absorption circuit, a capacitor filter circuit and a dummy load circuit; the transformer is provided with at least three secondary windings; the corresponding end of the rectifier diode is electrically connected with the corresponding ends of the secondary winding of the transformer, the RC absorption circuit, the capacitor filter circuit and the dummy load circuit respectively; wherein the rectifier diode is used for converting alternating current on the secondary winding side of the transformer into direct current; the RC absorption circuit is used for absorbing a backward voltage peak of the rectifier diode; the capacitor filter circuit is used for smoothing the output voltage; and the dummy load circuit is used for stabilizing the output voltage under a low load condition. According to the utility model, the problems of high withstand voltage and EMC of the rectifier diode are effectively solved.

An insulation and voltage resistance detection circuit comprises an input port which is connected with a rectifier diode through a resistance network and is used for carrying out current limiting and voltage dividing processing on an input signal; the rectifying circuit is used for carrying out full-wave rectification on an input signal by utilizing a plurality of diodes and outputting stable direct-current voltage; the filter circuit comprises a plurality of filter capacitors and is used for carrying out smooth filtering on the rectified direct-current voltage and providing stable output voltage; the optical coupler U1 is used for realizing electrical isolation between an input signal and an output power supply and avoiding high-voltage or noise conduction; the current limiting circuit comprises a current limiting resistor and is used for controlling the current passing through the optocoupler or the LED and protecting the device; by introducing a multi-stage resistor current limiting circuit, a diode rectification circuit, a filter capacitor circuit and an optical coupler isolation circuit, efficient power supply control is realized.

The invention discloses a wide dynamic range rectifier based on an automatic power distribution mechanism. The wide dynamic range rectifier comprises a high-power sub-rectifier and a low-power sub-rectifier, the high-power sub-rectifier comprises a high-power rectification trunk and a high-power rectification branch; the low-power sub-rectifier comprises a low-power rectification trunk and a low-power rectification branch; through the synergistic effect of a threshold switch control circuit and a tunable matching network arranged in a low-power rectification branch, the low-power rectification branch provides inductive impedance in a low-power state to compensate the inherent capacitive impedance of a low-power rectification diode, and presents a high-impedance state in a high-power state to turn off a low-power sub-rectifier. Therefore, the adverse effect of the low-power sub-rectifiers on the high-power sub-rectifiers is avoided while high-efficiency energy conversion in the low-power interval is ensured, and the overall rectification efficiency in the high-input power interval is remarkably improved.

The invention relates to the technical field of electric appliance control circuits, and discloses a non-isolated zero-crossing detection and commercial power voltage detection multiplexing low-cost simple circuit, which comprises a rectifier diode D3301 of which the cathode is connected with a live wire of a commercial power input end, and the anode is connected with a first resistor R3301; the first resistor R3301, the second resistor R3302 and the third resistor R3303 are connected in series. Through a sampling link formed by a rectifier diode D3301 and series voltage dropping resistors R3301, R3302 and R3303, a zero-cross detection signal is provided for an interruption input end VT at the same time, and a voltage detection signal is provided for an analog input end AD through a divider resistor R3304 and a filter capacitor C3301, so that multiplexing of two types of detection is realized under a non-isolation structure, commercial power detection can be completed without an optocoupler or an isolation transformer, and the detection efficiency is improved. Therefore, devices are reduced and circuits are simplified.

This invention relates to a circuit board for an ozone generator with frequency tracking functionality. The circuit board includes a frequency tracking circuit comprising an RC oscillation unit, an LC resonant unit, a current sampling unit, a comparison control unit, a voltage divider bias unit, and a frequency limiting protection unit. The LC resonant unit includes a resonant inductor T1 and a resonant capacitor C1, used to drive the ozone sensor. The current sampling unit includes a sampling resistor R8 connected in series in the LC resonant circuit, used to acquire the circuit current signal. The comparison control unit includes a comparator U1, a transistor Q1, a rectifier diode D2, and a filter capacitor C3. The voltage signal from the sampling resistor R8 is rectified by D2 and filtered by C3 before being input to the inverting input of U1. The voltage divider bias unit includes resistors R3 and R6. The RC oscillation unit is connected to the transistor Q1. This invention can adapt to capacitance changes during ozone sensor power-on and operation, automatically tracking the frequency and achieving resonance, while ensuring stable output power, extending device lifespan, and improving ozone generation efficiency and overall reliability.

The invention relates to an equalization circuit with a plurality of serially connected lithium battery packs, which is characterized in that the cathode of each lithium battery pack is connected with the cathode of a voltage sampling unit, the cathode of a capacitor C3 and the cathode of a winding L1, and the anode of the lithium battery pack 1 is connected with the anode of a diode of an optocoupler G1 and an optocoupler G2, the anode of the voltage sampling unit, the anode of the capacitor C3 and the cathode of a rectifier diode D1; the anode of the rectifier diode D1 is connected with the positive electrode of the winding L1, the cathodes of the diodes of the optocouplers G1 and G2 are connected with the two enabling ends of the voltage sampling unit, the positive end and the negative end of a power supply of the balance driving unit are connected with the negative end and the positive end of a voltage stabilizing diode D5 in the voltage division circuit in parallel, and the output end of the balance driving unit 31 is connected with the grid electrode of the field effect transistor T1. According to the lithium battery pack capacity balancing circuit, the problem of capacity difference existing between the lithium battery packs connected in series is effectively solved, the voltage between the lithium battery packs can be balanced, and the capacity of the lithium battery packs can be fully utilized.

The invention discloses a PN-junction-free magnetic control one-way conduction rectifying device, aims to solve the technical problem of reducing the loss of the rectifying device, and adopts the following technical scheme that the PN-junction-free magnetic control one-way conduction rectifying device is provided with an N-type semiconductor silicon wafer, the N-type semiconductor silicon wafer is divided into three areas along the Z-axis direction: a low-resistance area, a transition area and a high-resistance area, compared with the prior art, an N-type semiconductor is divided into a high resistance area and a low resistance area to replace a traditional PN junction type diode, a manufactured rectifying device with a one-way conduction function abandons PN junctions on a main current loop, and therefore the rectifying diode does not have PN junction loss. The design of the power supply circuit does not have the scurf of a rectification part, PN junction loss, complexity of a synchronous rectification circuit and heat dissipation are not considered, the cost is reduced, the size is reduced, and the conversion efficiency of the power supply is greatly improved while the circuit is simplified.

This utility model discloses a power supply circuit for a rail transit lighting system, wherein the anode of the anti-reverse diode D2 is connected to the DC power input terminal V. in The cathode is connected in series with fuse F1, then splits into two paths. The first path connects to the input pin VIN of the high-voltage linear regulator U1, and the second path is grounded through rectifier diode D1 and then connected in parallel with input filter capacitor C2. The input pin VIN of U1 is connected to the positive terminal of C2, the output pin OUT of U1 is grounded through the output filter capacitor C1, and the adjustment pin ADJ of U1 is grounded through resistor R6. The base of transistor Q2 is grounded through resistor R6, and the base is also connected to the output pin OUT of U1 through resistor R2. The collector is connected to the input pin VIN of U1, and the emitter of Q2 is directly connected to the power output terminal V. out Simultaneously, the adjustment pin ADJ of U1 is connected via resistor R4. Through the above method, the power supply circuit for the rail transit lighting system of this utility model adopts the TL783CKCSE3 high-voltage linear regulator, which supports wide voltage input and high voltage differential drop, effectively coping with fluctuations in the rail transit power grid and ensuring stable operation of the lighting system.

The application discloses a high-voltage direct-current converter topology and a control method thereof, and belongs to the technical field of power generation, power transformation or power distribution. The topology is composed of a high-voltage side filter inductor, a three-phase MMC inverter circuit, a three-phase leakage inductor, a three-phase transformer, a three-phase diode rectifier circuit, a medium-voltage side filter inductor and a medium-voltage side filter capacitor. The topology structure of the application can realize higher reliability, lower cost and smaller size by the relatively mature high-voltage side modular structure and the medium-voltage side diode series connection technology. By precisely controlling the three-phase current to be a positive-negative half-cycle symmetrical trapezoidal current, reliable commutation of the three-phase rectifier diode is realized, and meanwhile, smooth direct-current is synthesized on the high-voltage side and the medium-voltage side, so that the operation efficiency of the converter and the port power quality are significantly improved, and the filter size is reduced.

The utility model provides a battery active equalization circuit of an electric vehicle and the electric vehicle, the circuit comprises N control circuits, and each control circuit comprises a battery module and an equalization circuit; the DCDC chip is used for acquiring the voltage of the battery system and converting the voltage of the battery system into PWM waves; the amplified PWM waves push the transformer to work; when the PWM wave is at a high level, the transformer stores energy; when the PWM wave is at a low level, the primary side passes through active clamping follow current, and the secondary side outputs a current signal to charge a battery through a rectifier diode; after a current signal is established, the output current sampling resistor converts the current signal into a voltage signal and transmits the voltage signal to the isolation operational amplifier; and the isolation operational amplifier amplifies the voltage signal to obtain an amplified voltage signal, and transmits the amplified voltage signal to the DCDC chip, so that the DCDC chip processes the amplified voltage signal to generate an amplified feedback signal, and adjusts the output PWM wave according to the amplified feedback signal.

The utility model relates to linear power supply technical field discloses the linear power supply of active heat dissipation formula, include: main body, the inside below of main body is equipped with the circuit board, the outside of circuit board is equipped with active heat dissipation unit, is equipped with auxiliary unit in active heat dissipation unit. That linear power supply of active heat dissipation formula, through the cooperation between main body, circuit board and active heat dissipation unit, the heat that its inside voltage stabilizing element and rectifier diode etc. produce in main body 1 operating process, lead to circuit board 2 and main body 1 inside temperature rise, at this moment, part of heat will be transferred to the heat conduction plate 3, since the heat conduction plate 3 and bolt 5 all have good heat conductivity, and bolt 5 part is communicated with the outside through the through -hole 8, the heat conduction plate 3 will heat be transferred to bolt 5, thereby can export the heat in main body 1 interior to the outside, make main body 1 have certain active heat dissipation effect, the linear power supply is in the high -quality operation state with convenience.

The utility model relates to the technical field of direct current power supply and distribution, and particularly provides a non-isolated voltage detection circuit, which comprises a sampling module, a voltage clamping module, a first voltage sampling point A and a second voltage sampling point B. The sampling module comprises a resistor R1, a resistor R2 and a resistor R3. The voltage clamping module comprises a rectifier diode D1, a switching diode D2 and a switching diode D3, and a first voltage sampling point A is arranged between the output end of the rectifier diode D1 and the ground; a resistor R4 is connected in parallel between the switching diode D3 and the switching diode D2, and a second voltage sampling point B is arranged at the other end of the resistor R4; the device is reasonable in design, simple in structure, passive in overall design, free of extra power supply in operation, capable of reducing the aging problem of devices, high in reliability and suitable for long-term stable work; the circuit structure does not need complex devices, is low in manufacturing cost, and is suitable for large-scale popularization and application in the market.

This invention discloses a power amplifier power supply circuit for enhancing instantaneous driving capability under weak power conditions, applicable to power amplifiers with adjustable power rail voltage powered by a USB interface power supply or other low-power power supplies. It includes a signal processing unit and a boost power supply unit. The input terminal of the signal processing unit is connected to the audio signal input, and after processing the audio signal, it is connected to the input terminal of the power amplifier and the feedback terminal of the boost power supply unit. The input terminal of the boost power supply unit is connected to an external weak power supply, and the feedback terminal is connected to one of the outputs of the signal processing unit, with the output connected to the power supply terminal of the power amplifier. Each stage of the power supply circuit described in this invention employs a synchronous rectification boost circuit, reducing losses on the rectifier diodes and increasing the energy storage capacity of the energy storage devices. Through stage-by-stage energy storage and dynamic boosting, it can meet the driving requirements of audio signals with a wide envelope and containing instantaneous high-power signals, and is suitable for power amplifiers with different voltage supply requirements.

The application discloses a high-voltage module based on a double-voltage half-bridge driving circuit and a driving method thereof. The high-voltage module comprises a power input unit and a current limiting unit connected to external alternating current; a plurality of rectifier diodes connected to the input end; an energy storage unit adopting an energy storage capacitor C1 and an energy storage capacitor C2; a trigger diode D5 in the trigger unit being connected in relay to the energy storage capacitor C1 and a voltage transformation unit, and a trigger diode D6 being connected in relay to the energy storage capacitor C2 and the voltage transformation unit; a secondary winding of the voltage transformation unit being coupled to induce resonance sharp peaks; a double-voltage rectifier unit generating negative polarity high-voltage direct current through rectification, and the high-voltage direct current being output by a high-voltage output unit. Thus, through simple channel design and storage and discharge design, direct current high-voltage output is realized based on alternating current, the cost of components is greatly reduced, and the product size is significantly reduced. The rectification process realizes channel switching, and driving voltage boosting after rectification is not needed, the alternating current positive / negative half cycle can be driven, the loss is effectively reduced, and the load carrying performance and operation efficiency are significantly improved.

The invention provides a single-stage bridgeless conversion device integrating a Buck-Boost circuit and a half-bridge LCC circuit. The single-stage bridgeless conversion device is characterized by comprising the bridgeless Buck-Boost circuit and the half-bridge LCC circuit, the Buck-Boost circuit comprises three switching tubes Q1, Q2 and Q3, and one of the switching tubes Q3 is multiplexed as an upper tube of the half-bridge LCC circuit. According to the single-stage bridgeless conversion device integrating the Buck-Boost circuit and the half-bridge LCC circuit, the voltage stress of the MOS tube Q3 can be obviously reduced, and the stress of the added MOS tubes Q1 and Q2 is equal to the input voltage, so that the type selection of the MOS tubes is more favorable, a 500V MOS tube with high cost performance can be selected, and two power diodes are reduced in a main loop, so that the cost of a power semiconductor device can be reduced. Meanwhile, the working principle of the LCC circuit part is completely the same as that of a conventional LCC circuit, the Q3 and the Q4 can realize ZVS within a certain range, the secondary side rectifier diode realizes ZCS, obvious advantages in thermal design and efficiency are achieved, and product development in practical application is more convenient.

This invention belongs to the field of power electrical technology and relates to a wide voltage range clamped boost LLC resonant converter, comprising: an input DC bus voltage unit, an active clamped boost unit, an inverter bridge unit, an LLC resonant tank unit, a transformer T, and a rectification and filtering unit; the active clamped boost unit includes a first feed inductor, a second feed inductor, a clamping capacitor, a third switch S3, and a fourth switch S4; the LLC resonant tank unit includes a resonant inductor and a resonant capacitor connected in series, and a magnetizing inductor of the transformer T; the rectification and filtering unit includes a first rectifier diode, a second rectifier diode, and a filter capacitor C. o Load R L This invention solves the technical problem in the prior art that traditional LLC converters have a limited gain adjustment range and cannot simultaneously meet high boost requirements.

The utility model discloses a variable-frequency toaster, and belongs to the technical field of household appliances. Comprising a main body part, and the main body part is provided with a power switch, a first heating plate, a second heating plate and a third heating plate, the first heating plate and the second heating plate are connected in series; the third heating plate is arranged between the first heating plate and the second heating plate and is connected with the first heating plate and the second heating plate in parallel; baking spaces are respectively arranged between the first heating plate and the third heating plate and between the second heating plate and the third heating plate; wherein one end, close to a phase line, of the third heating plate is connected with the power switch through a relay switch and a rectifier diode; and the direction of the rectifier diode points to the phase line. According to the utility model, the food single-side baking function is realized, the production process problem, the service life problem and the electrical safety problem are solved, and meanwhile, the baking color heat distribution is easier to adjust.

The utility model discloses a light-emitting device for a vehicle hub. The light-emitting device comprises a middle cover; the mask and the middle cover form a closed cavity through ultrasonic welding; the backlight source module is arranged in the cavity, the backlight source module is sequentially provided with a mask, a diffusion sheet, a light guide plate and a flexible circuit board for mounting LEDs in a stacked mode, and the flexible circuit board comprises an energy storage circuit composed of a current-limiting resistor, a rectifier diode and a super capacitor; the suspension magnetic power generation assembly is fixed on the back surface of the middle cover and is electrically connected with the backlight source module; the suspension magnetic power generation assembly outputs electric energy to drive the LED to emit light and charge the super capacitor when the wheels rotate. The energy storage capacity of the super capacitor is configured to continuously supply power to the LED after the wheel stops rotating, so that the continuous light emitting time of the light emitting device is not less than 120 seconds; the defect that an existing hub lamp is immediately extinguished after parking is overcome, and the structural reliability, the assembly convenience, the visual effect and the like are remarkably improved.

A trench in a semiconductor substrate is lined with a first insulation layer. A hard mask layer deposited on the first insulation layer is used to control performance of an etch that selectively removes a first portion of the first insulating layer from an upper trench portion while leaving a second portion of first insulating layer in a lower trench portion. After removing the hard mask layer, an upper portion of the trench is lined with a second insulation layer. An opening in the trench that includes a lower open portion delimited by the second portion of first insulating layer in the lower trench portion and an upper open portion delimited by the second insulation layer at the upper trench portion, is then filled by a single deposition of polysilicon material forming a unitary gate / field plate conductor of a field effect rectifier diode.

The invention discloses a wide dynamic range efficient rectifier based on a self-bias junction capacitance compensation technology. The rectifier comprises a rectifier body and one or more junction capacitance compensation circuits. The junction capacitance compensation circuit comprises a compensation capacitor, a field effect transistor and a voltage dividing network. The compensation capacitor and the field effect transistor which are connected in series are connected to two ends of the rectifier diode in the rectifier body in parallel. The voltage dividing network is connected between the output path of the rectifier body and the ground. And a grid electrode of the field effect transistor is connected to a voltage division output interface of the voltage division network. The rectifier diode is connected in parallel with the self-biased junction capacitance compensation circuit, so that the compensation state can be automatically adjusted according to the change of the output voltage, the dynamic compensation of the junction capacitance of the diode along with the change of the input power is realized, and the high-efficiency input power range of the rectifier is remarkably widened.

The utility model discloses a plurality of variable pitch servo driver common bus energy equalizer is by n group isolation drive protection circuit group, n group switch control module group, n group isolation resistance diode group, n group capacitor group, n rectifier diode, isolation voltage sampling circuit, power supply circuit and MCU control unit composition. The utility model discloses through the ingenious control to the switch control module of multiple reverse series connection, has realized the common bus operation of plurality of variable pitch driver bus, and the electric energy between each bus can be self -adaptation and balanced two -way deployment and full use, reduces the configuration of variable pitch driver brake resistance and reduces the heat generation, improves system reliability.

The utility model provides a garment steamer circuit which comprises a power circuit, a control circuit, a boiler heating circuit and a water pump circuit. The control circuit is used for controlling the boiler heating circuit and the water pump circuit and comprises a main controller; the power supply circuit provides alternating current for the boiler heating circuit and the water pump circuit and provides a direct current working power supply for the main processor; the direct-current working power supply comprises a voltage-regulator tube ZD1, a rectifier diode D1 and an electrolytic capacitor EC1; the positive electrode and the negative electrode of the voltage-regulator tube ZD1 are respectively connected with an L phase line and an N phase line of the mains supply; the cathode of the rectifier diode D1 is connected with the anode of the voltage-regulator tube ZD1, the anode of the rectifier diode D1 is connected with the cathode of the electrolytic capacitor EC1, and the anode of the electrolytic capacitor EC1 is connected with the cathode of the voltage-regulator tube ZD1. According to the utility model, the voltage stabilizing diode is adopted to reduce the voltage, the voltage of 220 VAC or 110 VAC can be stabilized at 5 V by the 5 V voltage stabilizing diode, and then rectification and filtering are carried out to form a + 5 V power supply.

The application discloses a GPP rectifier diode chip with a gradient-doped composite glass passivation layer, and belongs to the technical field of semiconductor devices. The GPP rectifier diode chip with the gradient-doped composite glass passivation layer comprises a base substrate, a gradient diffusion zone and a composite glass passivation layer. The application solves the problems of poor interface charge stability, large leakage current and insufficient long-term reliability of a conventional single-layer or multi-layer glass passivation layer of an existing GPP rectifier diode chip. The first gradient distribution of the resistivity of the base substrate along the thickness direction, the second gradient distribution of the impurity concentration of the gradient diffusion zone surface along the transverse direction and the composite glass passivation layer with periodic fluctuation of carbon content inhibit the concentration effect of the junction edge electric field, improve the interface matching property and compactness of the passivation layer and the semiconductor surface, thereby reducing the leakage current, and improving the voltage resistance and long-term working stability of the device.

The application provides an LLC converter and a wide-range voltage regulation method thereof. The LLC converter comprises an input voltage, an input inductor L in , a first half-bridge unit, a second half-bridge unit, a resonant cavity, a transformer, a rectifier circuit, an output capacitor and an output load. The first half-bridge unit is composed of a first switch S1, a second switch S2 and a bus capacitor C1, the second half-bridge unit is composed of a third switch S3, a fourth switch S4 and a bus capacitor C2, the resonant cavity is composed of a resonant capacitor C r , a resonant inductor L r and an excitation inductor L m , and the rectifier circuit is composed of a first rectifier diode D1, a second rectifier diode D2, a voltage doubler capacitor C3 and a voltage doubler capacitor C4. The application can realize soft switching of all power devices in a wide voltage gain range, the switching frequency is fixed at a series resonant frequency, which is beneficial to optimization and design of magnetic elements, and the capacitor voltage of the half-bridge unit in the LLC converter can be self-balanced.

Provided in the present invention are a single-stage bridgeless conversion apparatus integrating Buck-Boost and half-bridge LCC circuits. The single-stage bridgeless conversion apparatus comprises a bridgeless Buck-Boost circuit and a half-bridge LCC circuit. The Buck-Boost circuit comprises three switch transistors Q1, Q2 and Q3, wherein the switch transistor Q3 is shared as a high-side transistor of the half-bridge LCC circuit. In the single-stage bridgeless conversion apparatus integrating Buck-Boost and half-bridge LCC circuits, the voltage stress on the MOS transistor Q3 can be remarkably reduced, while the stress on the added MOS transistors Q1 and Q2 is equal to an input voltage, such that favorable conditions are provided for MOS transistor selection, cost-effective 500 V MOS transistors can be selected, and two power diodes are also omitted from a main circuit, thus reducing the costs of power semiconductor devices. In addition, the operating principle of the LCC circuit part is exactly the same as that of a conventional LCC circuit, wherein Q3 and Q4 can achieve ZVS within a certain range and a secondary rectifier diode achieves ZCS, thereby offering significant advantages in thermal design and efficiency, and better facilitating product development in practical applications.