325results about How to "Achieve electrical isolation" patented technology

This invention relates to solar volt flexible switch reverser, which belongs to solar volt power generation technique field, which exerts direct voltage of the solar energy board into input capacitor two ends, wherein, input capacity end is connected to second induction end; other end of second induction is connected to integration electrode and first capacitor end; the first capacitor other end is connected to the encode end of third, second tubes and emission electrode of thirst control switch.

The invention relates to a unified power energy quality controller based on the serial-connection multiplicity of transformers and a chain structure, which belongs to the technical filed of flexible AC transmission and distribution of an electric power system and the power electronic. The unified power quality controller comprises a single-phase serial-connection multiple transformer bank and a single-phase chain H bridge converter, wherein the transformer bank consists of m single-phase transformers which form the serial-connection multiple transformer bank together with n voltage source converters connected with n secondary windings of m single-phase transformers respectively; the single-phase chain H bridge converter is provided with n chains and is formed by connecting n DC voltage supporting units and n power source converters, and an AC port of the n-chain single-phase chain H bridge converter is directly connected with the electric fence through a reactor, m and n are signless integrals equal to or more than 2, and m is less than or equal to n. The invention can realize accurate current control, has high dynamic responding speed, and can solve the problems of the traction substation of an electrified railway that the three-phase voltage is unstable and fluctuates, the power factor is low and the harmonic pollution exists, and the like.

The invention discloses an MEMS (micro electro mechanical system) device and a wafer-level vacuum packaging method thereof, wherein the MEMS device is composed of a glass substrate (1), a silicon wafer sensitive structure layer with a sealing ring (2), and a silicon cap (9), and the MEMS device is characterized in that at least two silicon islands (11) are arranged in the silicon wafer sensitive structure layer, the bottom of each silicon island (11) is connected with the glass substrate (1) and an electrode lead (8), a press welding spot (6) is respectively arranged on the top of each silicon island (11); parts, corresponding to the silicon islands, on the silicon cap are respectively provided with a press welding spot cavity (7), so that the press welding spots (6) are arranged in the press welding spot cavities (7); and the periphery of each press welding spot cavity is provided with a press welding spot sealing ring (12) which is connected and matched with the top of each silicon island, and the periphery of each press welding spot sealing ring is provided with a press welding spot isolation channel (5). The MEMS device and the wafer-level vacuum packaging method thereof disclosed by the invention have the advantages that the technical problem of electrical isolation between the leakproof structure of the press welding spot and the press welding spots caused by that an electrode is led in the surface of the structural layer of the device from the substrate is avoided, so that the vacuum packaging structure of the MEMS device disclosed by the invention is reasonable in design, simple in process, long in vacuum retention time, reliable in performance and versatile, thereby reducing the cost for vacuum packaging.

The invention relates to a multi-sub microgrid-contained mixed microgrid system and a control method thereof. The mixed microgrid system comprises a photovoltaic subsystem, an energy storage subsystem, a direct-current bus, a DC/AC converter and an alternating-current subsystem. The control method comprises the following steps: controlling running modes of the photovoltaic subsystem and the energy storage subsystem according a power grid instruction; controlling the running mode of the photovoltaic subsystem by using a perturbation observation method-based photovoltaic generation maximum power tracking method; and controlling the running mode of the energy storage subsystem by using a method of combination of dual-closed loop control and phase-shift control. Compared with the prior art, the provided system and the method have the advantages of electrical isolation realization, high security, and stable bus voltage and the like.

The invention discloses a computer interlocking system and an operation method thereof. The interlocking system comprises an interlocking machine, a communication gateway, a turnout execution unit, a signal execution unit and a track execution unit, wherein the turnout execution unit comprises a first action controller, a second action controller, a directional operation control ciruit, a reversed operation control circuit, a safety relay and a select switch, wherein the first action controller and the second action controller are used for controlling a group of switching tubes respectively arranged on the directional operation control circuit and the reversed operation control circuit, alternating current is input into the directional operation control circuit and the reversed operation control circuit and is controlled by the normally-open switch of the safety relay, the select switch is in communication connection with the first action controller, the second action controller and a signal collecting unit, and output of the first action controller, the second action controller and the select switch controls the safety relay by means of logical relation treatment. The invention uses the switching tubes to replace relays in the existing system, and adopts one safety relay and one select switch to ensure high reliability of the turnout execution unit, thereby greatly reducing cost of the whole system on the premise of ensuring the high reliability.

The invention provides a multifunctional integral electric automobile vehicle-mounted charging machine, which comprises a switch, a front end filtering module, a first rectifying module, a power factor correcting module, a first filtering module, an inversion module, a transformer, a second rectifying module and a second filtering module in sequential connection, wherein the transformer at least comprises one primary edge winding coil, one first secondary edge winding coil and one second secondary edge winding coil, the second rectifying module is connected with the second secondary edge winding coil, the second filtering module is connected with a storage battery, the charging machine also comprises a rectifying inversion module and a third filtering module, wherein the rectifying inversion module and the third filtering module are sequentially connected behind the first secondary edge winding coil, and the third filtering module is connected with a power battery. The multifunctional integral electric automobile vehicle-mounted charging machine has the advantages that the functions of the vehicle-mounted charging machine are expanded, the two functions of a vehicle-mounted alternating current and direct current charging machine and a direct current converter are realized, the cost of the vehicle-mounted charging machine is reduced, the weight and the size are reduced, meanwhile, the electric isolation is realized, and in addition, the energy conversion efficiency is high.

The invention relates to the technical field of semiconductor manufacturing and particularly relates to a three-dimensional memory and a manufacturing method thereof. The three-dimensional memory comprises a substrate, a stacking structure and an insulated atom layer settling layer, wherein the stacking structure is formed on the substrate and comprises grid electrodes, interlayer insulating layers and multiple layers of steps, the grid electrodes and the interlayer insulating layers are alternately stacked along the direction vertical to the substrate, and the steps are located at the end part of the substrate; the grid electrodes comprise thickened parts, and the thickened parts protrude along the direction, towards the stacking structure, of the substrate and are located on the top surfaces of the steps; and the insulated atom layer settling layer is in contact with the side walls of the steps and is used for electrically isolating the grid electrode between two layers of the steps.According to the three-dimensional memory, the problem that a three-dimensional memory easily malfunctions is avoided, and the memory performance of the three-dimensional memory is improved.

The invention discloses an insulated gate bipolar translator (IGBT) series connection type high-voltage pulse generator. The voltage is provided for the high-voltage pulse generator by a high-voltage power supply, and after the energy storage of an energy storage capacitor, high-voltage pulses are generated through a multistage IGBT series connection circuit. A programmable logic controller (PLC) generates pulse-width modulation (PWM) control pulses, the PWM control pulses are input into an optical fiber isolation circuit after passing through a PWM amplification circuit, further, the IGBT series connection circuit is driven, and the power supply required by the work of the IGBT series connection circuit is provided by a secondary circuit of the isolation power supply connected with the IGBT series connection circuit. Commercial electricity is changed into direct current through a rectifying circuit and a filter circuit, the direct current is changed into high-frequency square waves through a high-frequency power metal-oxide-semiconductor field-effect transistor (MOSFET) full-bridge inverter circuit driven by a power MOSFET driving circuit, and the high-frequency square waves are input into the secondary circuit of the isolation power supply after being isolated by a series connection magnetic ring circuit. When the IGBT series connection circuit generates faults, fault signals are input into the PLC through a fault output circuit and an optical fiber feedback circuit, the PLC interrupts control signals so that the IGBT series connection circuit is in a switch-off state, and the whole system is further protected.

The invention relates to a control method for an electric car V2G converter, and the method comprises the steps that an AC/DC part adopts voltage and current double-closed-loop feedback based on direct current control, including coordinate transformation and feedforward decoupling, and introduces PQ control to control active power and reactive power transmission; a DC/DC part adopts single phase shift to control the charging and discharging of a battery; a front stage AC/DC converter is used for controlling the transmission of the bidirectional active power and reactive power at a grid side; arear stage DC/DC converter is used for controlling the transmission of the active power transmission at a power battery side of an electric car and achieving the charging and discharging control of the power battery of the electric car. The method can realize the power four-quadrant operation and the reactive power control. The V2G converter realizes the transmission of the active power requiredby the V2G, can absorb reactive power from a power grid or transmit reactive power to the power grid while performing the function of charging and discharging the power battery pack of the electric car, thereby achieving the bidirectional transmission of reactive power.

The invention discloses a method for triggering signal communication between double-pole power tube IGBT gate pole driver units of the isolated gate of power electronic devices in the application of trigger pulse allocation units and high voltage in series. An optical fiber is used as communication media in the method, to ensure the reliability of the communication; one optical fiber is only needed to complete transmission of various trigger signals through a certain modulator approaches, therefore, the loss of communication line is reduced, the smallest quantity of track junction between equipments is ensured and wasting cost of optical fiber is reduced.

The invention discloses an on-line monitoring system and method of a 35kV high-voltage shunt capacitor. The on-line monitoring system of the 35kV high-voltage shunt capacitor mainly comprises a data collecting module, a data transmitting module, a data analyzing module, a display module and a power source supply module, wherein the data collecting module and the power source supply module are located at a high-voltage side of a transformer substation and are respectively used for collecting the running parameters of the capacitor and supplying power to the data collecting module, the data transmitting module achieves optical fiber transmission of data between the high-voltage side and a low-voltage side, and the data analyzing module and the display module are located in an industrial control computer at the low-voltage side and are respectively used for further analyzing the obtained data and storing, outputting and displaying the analysis result. The on-line monitoring system of the 35kV high-voltage shunt capacitor achieves transverse comparison of effective values of current and temperature and longitudinal comparison of capacitance values, and effectively avoids the defect that an existing single-parameter monitoring system is high in missing-judgment rate and false-judgment rate. Meanwhile, FFT conversion of self-adaptive windowing and interpolation is adopted, the accuracy of the harmonic wave analysis is improved, and on-line state monitoring and fault diagnosis on the high-voltage shunt capacitor are facilitated.

The invention relates to a grid connecting system of a permanent magnet synchronous wind driven generator. The grid connecting system of the permanent magnet synchronous wind driven generator comprises a wind machine, a permanent magnet synchronous generator, a generator side converter, a direct current booster module, a power grid side converter, an energy storage module and a control module. The wind machine, the permanent magnet synchronous generator, the generator side converter, the direct current booster module and the power grid side converter are connected in sequence, a first capacitor is connected between the generator side converter and the direct current booster module in parallel, a second capacitor is connected between the direct current booster module and the power grid side converter in parallel, the energy storage module is connected between the second capacitor and the power grid side converter in parallel, and the control module is respectively connected with the generator side converter, the direct current booster module, the power grid side converter and the energy storage module. Compared with the prior art, the grid connecting system of the permanent magnet synchronous wind driven generator adopts a high-frequency transformer to replace an original industrial frequency transformer to achieve high voltage grid connection, and adopts super-capacitors to store energy to enable the system to have good low-voltage operation performance.

The invention discloses a mine locomotive monitoring system under the multilayer heterogeneous industrial control network convergence technology, which comprises an intrinsically safe power module, a gateway module and a dynamic annunciator module, a vehicle-mounted annunciator module, a point switch module and an axle counter module respectively communicated with the gateway module. The mine locomotive monitoring system is convenient and fast to install and low in cost and reliable in operation. The mine locomotive monitoring system is a multilayer network mine locomotive transportation monitoring system controlled through overall coordination, and can meet the development requirements on the digital mine industry.

The invention discloses a single-stage PFC (power factor correction) converter and an electric vehicle charging apparatus equipped with the same. The converter comprises a first rectifier bridge, a PFC full-bridge circuit, a high frequency transformer, a rectification filter circuit and a control unit, wherein the first rectifier bridge is connected with an input power supply; the PFC full-bridge circuit is connected with the first rectifier bridge; the PFC full-bridge circuit comprises a first switching device, a second switching device, a third switching device and a fourth switching device that form a full-bridge bridge arm and are provided with a first node and a second node; one end of the primary winding of the high frequency transformer is connected with the first node through leakage inductance while the other end of the high frequency transformer is connected with the second node; the rectification filter circuit is connected with the secondary winding of the high frequency transformer; and the control unit controls the first switching device, the second switching device, the third switching device and the fourth switching device so as to enable the single-stage PFC converter to realize power factor correction and DC/DC isolation conversion. The converter can realize the power factor correction and electrical isolation between a high voltage circuit and a low voltage circuit; and in addition, the single-stage PFC converter is small in size and high in working efficiency.

The invention discloses an electromagnetic compatibility testing load device and a testing system of a new energy automobile electric driving system. The load device comprises a load motor, a load motor controller, a transmission device, a torque rotating speed sensor, a power supply, a first photoelectric signal converter, a second photoelectric signal converter, a monitoring device, a DC high voltage filter and a screening box; the testing system comprises the load device, an electric driving system, a low-voltage artificial network, a high-voltage artificial network, a high-voltage DC source, a DC filter, a testing table and an anechoic chamber. The load device is movable, capable of realizing high-rotating speed large torque and used for performing electromagnetic compatibility testingof the large power motor, thereby preventing an operation of importing the radiation interference from the external and preventing the load device from producing radiation interference on the external testing environment; furthermore, the testing system takes electricity from the AC power grid, and the mechanical energy of the tested motor is converted into the electric energy through the load device, and then is merged into the AC power grid, thereby realizing the cyclic utilization of the energy and reducing the experimental consumption.

The invention discloses a high-frequency isolation type tri-level inverter based on a forward converter. The high-frequency isolation type tri-level inverter based on the forward converter is composed of an input direct-current power supply (Ui), a dividing capacitor, a high-frequency isolation type forward tri-level conversion unit, a frequency converter, an output filter and an output alternating-current load, wherein the input direct-current power supply (Ui), the dividing capacitor, the high-frequency isolation type forward tri-level conversion unit, the frequency converter, the output filter and the output alternating-current load are connected in sequence. The high-frequency isolation type tri-level inverter based on the forward converter has two stages of power conversion (direct current DC--high frequency alternating current HFAC--low frequency alternating current LFAC), and has bidirectional power flow, the front end of the output filter is good in voltage spectral characteristic, and the high-frequency isolation type tri-level inverter based on the forward converter has high power density, can reduce the voltage stress of a switching element, and can achieve high-frequency electrical isolation of alternating current load and direct-current power supply.

The invention relates to a high-voltage transformer bushing tap grounding on-line monitoring device, which comprises three tap grounding detection devices, a sampling transmission device, a remote monitoring device and a solar battery pack, wherein the three tap grounding detection devices are connected with the sampling transmission device by cables, the sampling transmission device is in wireless communication connection with the remote monitoring device, and the solar battery pack is connected with the sampling transmission device. Through the tap grounding device, the transformer bushing tap grounding is more reliable; and the transformer bushing tap grounding current is detected through measurement coils arranged in the tap grounding device, the sampling voltage output by the measurement coils is led out through measurement leads and used as an input signal of the sampling transmission device, the sampling transmission device outputs the signal to the remote monitoring device, and the tap grounding current can be continuously monitored through the remote monitoring device. The device realizes real-time remote continuous monitoring of the transformer bushing tap grounding current state, and is reliable and stable in working state.

The invention discloses a piezoelectric coupler and a power circuit thereof. The piezoelectric coupler and the power circuit thereof are mainly used in the occasion that input and output need to be isolated in a micropower switch power supply or in a low-power switch power supply. The piezoelectric coupler comprises two resonant branches used for piezoelectric coupling; each resonant branch is composed of piezoelectric harmonic oscillators; by applying the power circuit of the piezoelectric coupler, an electric signal of a primary-side topology is in direct resonant coupling with an auxiliary-side topology through a first resonant branch of the piezoelectric coupler; and a loop is formed through the other resonant branch of the piezoelectric coupler after loading. The piezoelectric coupler and the power circuit provided by the invention can be used for solving the problems that the process is complex and the manpower cost is high when the former switch power supply is isolated by adopting an electromagnetic transformer, and the problems of low temperature stability, low transformation rate and electro-magnetic interference (EMI) when an inductance and a capacitance as discrete components are connected on the circuit in a capacitance isolated scheme.

The invention relates to a high-voltage DC-DC conversion device comprising a cascade modular converter, a double-winding medium- and low-frequency sinusoidal transformer and an input parallel modular converter. The cascade modular converter comprises two bridge arms the same in structure. Each of upper and lower half bridge arms comprises at least two positive half-bridge topology power modules and a reactor. The double-winding medium- and low-frequency sinusoidal transformer comprises a high-voltage primary winding and a low-voltage secondary winding coupled to each other. Two leads of the high-voltage primary winding are connected to two contacts of the two bridge arms respectively. The input parallel modular converter comprises a modular converter submodule or at least two mutually parallel modular converter submodules. The input end of every submodule is connected to the low-voltage secondary winding. The high-voltage DC-DC conversion device has the advantages that the problems of voltage withstanding, voltage sharing and insufficient transmission capacity in high-voltage switching devices of the existing equipment are solved; the high-voltage DC-DC conversion device is significant to quickening the utilization and marketization progress of high-voltage DC-DC conversion devices.

The invention discloses a dual power supply electro-hydraulic power steering system and a control method thereof. The high-voltage power supply of the vehicle and the vehicle-mounted low-voltage power supply are used to simultaneously supply power to the double-winding steering motor. Respond in time to improve the reliability of the steering system, and use the low speed of the steering motor when there is no steering demand, and quickly increase the speed to provide steering assistance when there is a steering demand, effectively saving energy.

The invention provides an MWT (metal wrap through) back-contact solar cell, a preparation method and a module thereof, belonging to the field of photovoltaic techniques. The MWT back-contact solar cell comprises a first conductive type area, a second conductive type area, an auxiliary gate electrode, a through hole, a main gate electrode and a second electrode, wherein the first conductive type area is arranged on the back surface of a cell substrate, the second conductive type area is arranged on the front surface of the cell substrate, and the contact between the main gate electrode and the cell substrate is set as a non-ohmic contact, or an insulating layer is also arranged between the main gate electrode and the cell substrate so as to realize the electrical isolation of positive and negative electrodes of the cell. Therefore, the solar cell is simple in preparation method and high in conversion efficiency, a step of forming an isolation channel is omitted, and the breakage rate of a corresponding cell preparation module is low.

The invention discloses a wide voltage data collection device based on a complex programmable logic device (CPLD). Gear selected signals of a knob gear selection circuit are isolated by a photoelectric isolation circuit, then transmitted to a CPLD control unit, and then transmitted to a multi-path selector gear selection circuit through a digital isolator to control a channel. Analog voltage signals collected externally are attenuated through a matching resistance input circuit, transmitted to the channel selected by a multi-path selector through a clamping protection circuit, output to a calculation amplifier of an amplification buffer circuit, and transmitted to an analog/digital conversion circuit to achieve data conversion through the protection of the clamping protection circuit. Converted digital signals are transmitted to the CPLD control unit to perform data cache through a digital isolation circuit, and a final measurement result is output. The wide voltage data collection device based on the CPLD can collect data of simulation voltage signals from -600 V to +600V at high speed, and anti-jamming capacity of the whole device is greatly improved.