15results about How to "Reduce conduction loss" patented technology

The application provides an inverse-conducting insulated gate bipolar transistor and a preparation method thereof, and belongs to the technical field of power semiconductor devices, and comprises: a first groove is a gate groove, a second groove is an emitter groove, and a third groove is an ineffective gate groove; in the lateral direction parallel to the cell surface, the first groove, the second groove and the third groove are sequentially and spacedly arranged, and the first groove and the second groove are connected through a fourth groove, and the fourth groove is a gate groove; in the longitudinal direction, the second groove is located between two adjacent fourth grooves. The beneficial effects are as follows: the gate groove and the ineffective gate groove are connected through the lateral gate groove, the forward conduction voltage drop and the conduction loss of the device are reduced; the current channel is increased, the current distribution is more uniform, the heat loss is reduced, the reliability and the power density of the device are improved; the emitter groove is used for repeatedly arranging the polysilicon gate and the metal gate in the lateral and longitudinal directions, the regularly arranged diodes and Schottky diodes are formed, and the reverse diode current distribution is more uniform.

This application discloses a low-power underwater acoustic communication system for underwater navigation and ranging, relating to the field of underwater communication technology. It includes a digital signal processing platform for preprocessing the digital baseband signal to be transmitted to obtain a single-ended analog signal; a transmitting circuit module, comprising at least: a power amplification unit; the power amplification unit being a single chip integrating a PWM modulation circuit, a drive amplification circuit, and a power amplification circuit, wherein the power amplification unit sequentially performs PWM modulation, drive amplification, and power amplification on the single-ended analog signal to output a target amplified signal; and an underwater acoustic transducer for converting the target amplified signal into an acoustic signal and transmitting it into the water medium. This application can reduce energy loss during signal transmission.

A three-level double-buck conversion circuit for a post-stage of an energy storage inverter integrated device, comprising an energy storage battery, a bidirectional DC-DC converter, switching tubes S1, S2, S3, S4, S5, S6, S7, diodes D1, D2, D3, D4, D5, D6, D7, inductors L1 and L2, and capacitors C1 and C2. The three-level double-buck conversion circuit comprises a bidirectional switching tube composed of switching tube S4, diodes D3, D4, D5, and D6, and a double-buck circuit structure composed of switching tubes S2 and S3, diodes D1 and D2, and inductors L1 and L2. The three-level double-buck conversion circuit of the present application organically integrates three-level technology and a double-buck circuit structure, and has the advantages of low switching tube voltage stress, high reliability, and high efficiency.

This application provides a DC filter component with negative voltage surge protection and reverse connection protection, relating to the field of electronic technology. It includes: a reverse connection protection circuit, a discharge circuit, a data acquisition and control circuit, and an input common-mode filter circuit. The reverse connection protection circuit includes a first NMOS transistor, whose drain is connected to the negative bus, its source is electrically connected to the first system ground, and its gate is electrically connected to the positive bus through a target resistor. The data acquisition and control circuit acquires the bus voltage and controls the first NMOS transistor to be turned off for a first preset time period when the bus voltage is less than or equal to a first preset voltage threshold. When the input power is lost, a group of capacitors is discharged through a first discharge resistor during the period when the bus voltage drops to a second preset voltage threshold, and a group of capacitors is discharged through a second discharge resistor during the period when the bus voltage drops from the second preset voltage threshold to a preset safe voltage value. Implementing the technical solution of this application improves the reliability of the DC filter component.

This application discloses a DAB converter and its driving control method. The method includes: obtaining the voltage transfer ratio based on the input voltage and output voltage of the DAB converter; obtaining the feedforward power based on the input voltage, voltage transfer ratio, and output current of the DAB converter; obtaining the primary-to-secondary side shift ratio based on the input voltage, output voltage, voltage transfer ratio, input current, and feedforward power of the DAB converter; obtaining the primary-side inward shift ratio and the secondary-side inward shift ratio based on the voltage transfer ratio, feedforward power, and the primary-to-secondary side shift ratio; and driving the DAB converter based on the primary-side inward shift ratio, the secondary-side inward shift ratio, and the primary-to-secondary side shift ratio. This invention optimizes the values ​​of the primary-side inward shift ratio, the secondary-side inward shift ratio, and the primary-to-secondary side shift ratio using relevant parameters of the DAB converter to achieve precise driving control of the DAB converter. By adjusting the control parameters of the DAB converter, the soft-switching range can be expanded, current stress reduced, and light-load efficiency improved, while significantly increasing the system's energy conversion rate.

This invention discloses a reverse polarity protection circuit, an integrated circuit, and an electronic circuit including the integrated circuit. The integrated circuit includes an input terminal for receiving an input voltage, an output terminal for providing an output voltage, a reference terminal, a power ground terminal, a power transistor, a main control circuit, a variable resistor circuit, and a drive circuit. The power transistor has a current conduction path coupled between the input terminal and the output terminal and a control terminal. The main control circuit provides a control signal based on the potential of the reference terminal to the control terminal of the power transistor. The variable resistor circuit is coupled between the reference terminal and the power ground, switching between an on state and an off state based on a drive voltage applied to a control terminal of the variable resistor circuit. The drive circuit adjusts the drive voltage based on the voltage polarity of the input voltage or the output voltage. Using embodiments of this invention, the reliability of the protection circuit is ensured while maintaining low conduction losses.

The application discloses a high-reliability driving control method and device for a ZVS BUCK converter and the converter, and relates to the technical field of power electronic converters. The application discloses a high-reliability driving control method and device for a ZVS BUCK converter and the converter, and relates to the technical field of power electronic converters. The application discloses a high-reliability driving control method and device for a ZVS BUCK converter and the converter, and relates to the technical field of power electronic converters. The application discloses a high-reliability driving control method and device for a ZVS BUCK converter and the converter, and relates to the technical field of power electronic converters. The application discloses a high-reliability driving control method and device for a ZVS BUCK converter and the converter, and relates to the technical field of power electronic converters. The application discloses a high-reliability driving control method and device for a ZVS BUCK converter and the converter, and relates to the technical field of power electronic converters.

The application provides an epsilon phase gallium oxide based material and a crystal student growth method and use thereof, the crystal student growth method comprising epitaxial growth of the epsilon phase gallium oxide based material on a substrate with a polar surface, so that the epsilon phase gallium oxide based material has the same polarization direction as the polar surface. The application selects a substrate with a specific surface polarity and controls the growth of high-quality crystals through substrate and template engineering, thereby guiding controllable polarity growth by using the specific substrate as a template. Thus, active regulation of the polarization direction of the epsilon phase gallium oxide based material can be supported, the bottleneck of single polarization characteristics of the material system is broken, a key material foundation for developing a new generation of high-performance functional devices based on polarization engineering is laid, and the application has important scientific and application values.

The utility model provides a kind of bidirectional gallium nitride T type three-level power module and circuit board, wherein, upper bridge arm switch device, midpoint bidirectional switch device and lower bridge arm switch device are all bidirectional gallium nitride power switch;The first drive reference pin of upper bridge arm switch device is connected direct current positive bus;The first drive reference pin of midpoint bidirectional switch device and the first drive reference pin of lower bridge arm switch device are connected to the second drive reference pin of upper bridge arm switch device;The first drive reference pin of midpoint bidirectional switch device and the first drive reference pin of lower bridge arm switch device are also connected to the second drive reference pin of upper bridge arm switch device;The second drive reference pin of midpoint bidirectional switch device is connected direct current neutral line;The second drive reference pin of lower bridge arm switch device is connected direct current negative bus, can reduce the quantity of power tube, reduce conduction loss.

A DC / AC conversion device and a power supply system. The DC / AC conversion device comprises a transformer, a DC / AC conversion circuit located at the primary side of the transformer, a rectification circuit and a phase switching circuit located at the secondary side of the transformer, and a controller; wherein: the transformer is coupled with the DC / AC conversion circuit, and is adapted to step up a first alternating current signal output by the DC / AC conversion circuit to obtain a second alternating current signal; the rectification circuit is coupled with the transformer, and is adapted to rectify the second alternating current signal to obtain a second direct current signal; the phase switching circuit is coupled with the rectification circuit, and is composed of a plurality of switching tubes, and is adapted to phase switch the second direct current signal to obtain a third alternating current signal, the third alternating current signal being adapted to be input to an alternating current grid; and the controller. By using the above scheme, the loss of the switching tube in the DC / AC conversion device can be reduced.

The application relates to an AlGaN / GaN vertical high electron mobility transistor and a manufacturing method thereof; solves the problem that when the field plate technology is applied to a device with a vertical drift region, the vertical drift region is easily affected by charge imbalance, thereby affecting the on-current; comprises a substrate of a GaN material; an N-type drift region, a GaN channel layer and an AlGaN barrier layer are sequentially grown above the substrate; a source region is formed on the upper surface of the AlGaN barrier layer, and a source electrode is arranged in the source region; the same number of P-type floating buried layers are formed on the left and right sides of the N-type drift region, and a P-type blocking layer is formed on the upper portion of the N-type drift region; a multilayer stepped dielectric groove is formed by etching through the middle portions of the N-type drift region, the P-type blocking layer, the GaN channel layer and the AlGaN barrier layer; a multilayer stepped oxide layer is arranged on the inner wall of each side of the dielectric groove; an SIPOS field plate is deposited between the oxide layers on the two sides; polycrystalline silicon is deposited above the SIPOS field plate; a gate electrode and a passivation layer are arranged above the polycrystalline silicon; and the two source electrodes are connected in common.

This invention discloses a method, device, electronic equipment, and medium for improving the overload capacity of a grid-connected converter, addressing the technical problem that current related technologies have poor versatility and limited overload capacity improvement, making it difficult to meet the requirements for safe system operation. The method includes: acquiring three-phase current signals from the grid-connected converter and the grid connection point within the current control cycle; if the grid-connected converter is determined to be in an overload operating state based on the three-phase current signals, obtaining the optimal DC voltage value from a preset DC voltage level table based on the current overload level; and sending the optimal DC voltage value to the grid-connected converter so that the grid-connected converter control switches the current DC bus voltage value at the grid connection point to the optimal DC voltage value.

The embodiment of the invention provides a control method of a dual-active-bridge micro inverter and related equipment, and belongs to the technical field of power electronic converter control. The method comprises the following steps: firstly, establishing a unilateral asymmetric duty ratio modulation model based on three variables of an external phase shift angle D1, an internal phase shift angle D2 and switching frequency, and deducing transmission power and soft switching constraint conditions; secondly, the switching frequency is dynamically adjusted according to the voltage phase of the power grid, and high frequency is adopted near voltage zero crossing to expand the soft switching range; thirdly, in a rated frequency interval of main power transmission, taking minimization of current stress as a target, adopting an improved self-adaptive particle swarm algorithm to carry out on-line optimization on D2 under the soft switching constraint, and calculating a corresponding D1; and finally, combining the optimized frequency with the phase shift angle feed-forward quantity and the feedback compensation quantity to generate a PWM driving signal. According to the invention, the large-range soft switching of a whole power frequency period is realized, the conduction loss is obviously reduced, and the system efficiency and reliability are improved.

The utility model discloses a high temperature downhole power supply device, including output interface, upper shell, lower shell, main drive power supply, spare drive power supply, control board power supply, main control board, drive board, single core cable input interface, main drive power supply, spare drive power supply all are arranged in the middle of upper shell and lower shell, single core cable input interface electricity is connected control board power supply, and power supply supplies power to main control board, and main control board controls drive board drive, and drive board controls the switch of main drive power supply, spare drive power supply respectively. The utility model discloses dual power module parallel operation and possesses the redundancy switching function, eliminates the single point failure risk, sets up main control unit, real -time monitoring battery voltage, current, temperature, prevents overcharge, overdischarge, overcurrent, short circuit, effectively overcomes the performance degradation and failure risk under the severe working condition such as high temperature, high pressure and strong vibration.

This invention provides a spring-driven radial compression-based pluggable GIS terminal and its assembly method, belonging to the technical field of conductive connection equipment. The terminal includes an epoxy sleeve, terminals, cable cores, stress control components, a stop sleeve, a cone support, a cone support pressure plate, a spring propulsion assembly, and a tail tube. The terminals are disposed within the epoxy sleeve, with one end connected to the GIS equipment via a tapered bevel, and the other end equipped with a watch strap contact finger. The cable core is plugged into the terminals. The stress control component is disposed within the epoxy sleeve and contains a stress cone. The stop sleeve contacts the stress control component. The cone support and the cone support pressure plate are connected via a tightening screw. The spring propulsion assembly includes several springs and guide rods, with the springs positioned between the cone support and the cone support pressure plate. This invention optimizes the electric field distribution, enhances contact stability, improves working efficiency, and reduces processing costs.