782 results about "Isolation transformer" patented technology

The invention relates to the technical field of hybrid inverters, and discloses a hybrid inverter supporting reactive compensation and a control method thereof, and the hybrid inverter comprises a DC input unit, a three-phase full-bridge inversion unit, a grid-connected switching unit, a signal acquisition unit and a digital control unit. The direct current input unit comprises a photovoltaic interface, a battery interface and a direct current bus and is used for converging photovoltaic and energy storage electric energy; the three-phase full-bridge inversion unit is composed of a power device and an LCL filter and converts direct current into alternating current. The grid-connected switching unit comprises a static switch and an isolation transformer and is used for controlling power grid connection; the signal acquisition unit detects voltage and current signals; and the digital control unit judges a grid-connected mode or an off-grid mode according to the signal, calculates a reactive current reference value and generates a PWM (Pulse Width Modulation) control signal so as to realize reactive compensation control in the grid-connected mode and the off-grid mode. According to the invention, reactive power compensation capability is provided in both grid-connected and off-grid operation modes, and stable operation of the inverter in various working conditions is ensured.

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 present disclosure relates to circuits for connecting components of a hydrogen plant to a power grid to power the components in an efficient manner. In one implementation, power-side alternate current (AC) to direct current (DC) converters may be connected to a source power grid without the need for an isolation transformer by providing separate buses between the power-side AC-DC converters and load-side DC-DC converters instead of a shared DC bus between the converters. Other implementations for connecting components of a hydrogen plant to a power grid may include an adjustable transformer, such as a tappable transformer or an autotransformer, to connect any number of auxiliary loads of the plant to the power grid. The adjustable transformer may provide for various types of auxiliary load devices to connect to the power provided by the transformer at the same time, including both three-phase devices and one-phase devices.

The invention belongs to the field of power transmission line parameter measurement, and discloses a live-line testing device and method for mutual inductance line parameters and zero-sequence impedance parameters. The device comprises a double-circuit line simulation module, a pilot frequency excitation module, a power frequency simulation module, a synchronous acquisition module and a signal processing module. The isolation transformer simulates a double-circuit line, the pilot-frequency power supply provides pilot-frequency excitation signals, the measurement unit realizes synchronous acquisition, and the signal processing module performs anti-interference and amplification processing. The method comprises the steps of line simulation wiring, synchronous time synchronization, pilot frequency signal acquisition, parameter calculation and error verification, and pilot frequency parameters are converted into power frequency parameters by using a frequency conversion formula. According to the invention, power frequency interference can be effectively suppressed in a charged environment, high-precision measurement of zero-sequence impedance and mutual inductance parameters of a mutual inductance line is realized by using pilot frequency excitation and Beidou synchronization technologies, the measurement error is remarkably reduced, the safety and reliability are remarkably improved, and powerful technical support is provided for safe and stable operation of a power system.

The invention discloses a multi-energy micro-grid power supply system based on a hydrogen fuel cell and a control method. The micro-grid power supply system comprises an intelligent grid-connected switch, an electrical load, an isolation transformer, an energy storage converter, a hydrogen fuel cell system, an energy storage lithium battery system and a local energy management system. The control method comprises the steps that when a power grid loses power or a PCC switch is switched off, an energy storage converter PCS is automatically switched to an off-grid operation mode or is switched to an off-grid operation mode according to an off-grid command, and stored electric energy is continuously used for on-load operation; when the power grid recovers or is converted into grid connection in a planned manner, the PCS is automatically synchronized to a state which is synchronous with the power grid or according to a grid connection command, and the intelligent static switch is closed to be converted into grid connection operation. According to a coordination control strategy among the PCS converter, the intelligent grid-connected switch and the energy storage battery and an SOC grading strategy between the fuel battery and the energy storage battery, functions of millisecond-level fast switching of grid-connected and off-grid operation, variable load fast energy scheduling control of a load and the like are realized.

A bidirectional high voltage AC-DC converter includes a primary three-phase three-level T-type power factor correction circuit, a full-bridge switching circuit connected to the primary three-phase three-level T-type power factor correction circuit output, an isolated capacitor-inductor-inductor-capacitor (CLLC) resonant tank connected to the full-bridge switching circuit, a T-type full-bridge output topology circuit connected to the CLLC resonant circuit, and a controller that controls one or more of the components of the bidirectional isolated high voltage AC-DC converter. The primary three-phase three-level T-type power factor correction circuit and the secondary three-level circuit include a split DC-link bus with respective voltages that are actively controlled by the controller. The CLLC resonant converter circuit includes an isolation transformer that electrically isolates the primary side from the secondary side of the bidirectional isolated high voltage AC-DC converter. A control method includes synthesizing, via a modified space vector pulse width modulation (SVPWM) scheme or a variable-amplitude double-carrier sine-triangle PWM with capacitor bank middle point voltage control, one or more output voltages of the front end three-phase three-level T-type PFC circuit, wherein the modified SVPWM scheme is based, at least in part on a nearest four vectors technique.

The utility model discloses a soft start system based on excitation current reduction, which is characterized in that a time relay mainly controls the switching of a live wire between a power resistor and an alternating current contactor, the power resistor magnetizes a transformer at the moment of electrification, and the alternating current contactor is connected into a circuit by the time relay after the magnetization is completed; and after the power resistor is short-circuited, the circuit is cut out, so that the purpose of suppressing the excitation inrush current is finally achieved, the excitation effect caused by voltage abrupt change at the power-on moment of the isolation transformer can be avoided, and the excitation abrupt change of the isolation transformer during power-on is effectively reduced.

The invention discloses an efficient new energy transformer and an electric energy control system, and relates to the technical field of transformers, an input power conversion module is used for converting a direct current or alternating current variable voltage source into high-frequency alternating current for output, and a high-frequency isolation transformer module adopts a nanocrystalline-amorphous alloy mixed magnetic core. The windings are arranged in a three-layer staggered mode and provided with an oil dual-cooling system, and the output rectification inversion module is used for converting high-frequency alternating current into needed direct current or alternating current to be output and integrates the multi-phase synchronous rectification function and the active filtering function. By designing the nanocrystalline-amorphous alloy mixed magnetic core and the three-layer staggered winding, leakage inductance is reduced, the coupling coefficient is increased, the problems of leakage inductance and nonuniform magnetic flux caused by serious iron loss, large leakage inductance and unreasonable coil arrangement of a traditional single-material low-frequency iron core at medium and high frequencies are solved, hysteresis and eddy-current loss are effectively inhibited, and the service life of the low-frequency iron core is prolonged. The leakage inductance is minimized, the high-frequency transformation efficiency is improved, and the size and the weight are reduced.

The invention provides a double-phase pulse circuit and a high-frequency pulse therapeutic apparatus, and relates to the technical field of medical instruments, and the double-phase pulse circuit comprises a booster circuit, N groups of pulse modulation isolation transformation circuits, an amplitude-limiting current-limiting circuit, a cascade circuit, a double-phase wave modulation circuit and a main controller, the boost circuit performs pulse modulation and boost processing on the output DC voltage of the target DC power supply to obtain an initial pulse voltage signal; n groups of pulse modulation isolation transformation circuits respectively perform isolation boosting processing on the initial pulse voltage signals to obtain N high-voltage pulse signals; the amplitude-limiting current-limiting circuit performs amplitude-limiting current-limiting processing on the N high-voltage pulse signals to obtain N high-voltage square-wave pulse signals; performing cascade processing on the N high-voltage square-wave pulse signals to obtain a target square-wave pulse signal; and performing dual-phase modulation on the target square wave pulse signal to obtain a target dual-phase pulse signal. According to the technical scheme, the effect of improving the safety of the double-phase pulse circuit is achieved.

The present disclosure relates to circuits for connecting components of a hydrogen plant to a power grid to power the components in an efficient manner. In one implementation, power-side alternate current (AC) to direct current (DC) converters may be connected to a source power grid without the need for an isolation transformer by providing separate buses between the power-side AC-DC converters and load-side DC-DC converters instead of a shared DC bus between the converters. Other implementations for connecting components of a hydrogen plant to a power grid may include an adjustable transformer, such as a tappable transformer or an autotransformer, to connect any number of auxiliary loads of the plant to the power grid. The adjustable transformer may provide for various types of auxiliary load devices to connect to the power provided by the transformer at the same time, including both three-phase devices and one-phase devices.

An apparatus for transferring power includes a first power converter coupled to a first power interface, an isolation transformer having a first transformer coil coupled to the first power converter and a second transformer coil magnetically coupled to and galvanically isolated from the first transformer coil, a second power converter coupled to the second coil of the isolation transformer and to a second power interface, a third transformer coil magnetically coupled to and galvanically isolated from the first transformer coil and magnetically coupled to the second transformer coil, and a third power interface for connecting the third transformer coil to a wireless power transmission (WPT) resonator.

A power conversion device includes: a DC / DC converter; and a control circuit unit that controls the DC / DC converter, in which the DC / DC converter includes a first power output circuit that converts first direct current power into first alternating current power, an isolation transformer that converts the first alternating current power into second alternating current power, and one or a plurality of second power output circuits, each of which converts the second alternating current power into second direct current power, and the control circuit unit includes a resonance characteristic calculator that calculates a resonance characteristic of the second power output circuits based on a load for each of the second power output circuits to output the second direct current power, and determines a drive frequency of the first power output circuit based on an output request value of the second power output circuit and the resonance characteristic that is calculated.

The invention relates to a direct-current transformer circuit topology based on a series three-phase bridge circuit and a control method thereof. A high-voltage side power unit comprises N three-phase series half-bridge circuits which are sequentially connected in series; the low-voltage side power unit comprises N three-phase parallel half-bridge circuits which correspond to the three-phase series half-bridge circuits and are sequentially connected in parallel, each three-phase series half-bridge circuit is connected with the corresponding three-phase parallel half-bridge circuit through a three-phase isolation transformer to form N groups of three-phase bridge modules, and meanwhile, the N groups of three-phase bridge modules are connected with the N groups of three-phase isolation transformers. A symmetrical duty ratio and phase shift hybrid control strategy is adopted to realize bidirectional flow of energy and soft switching in a full range, and intra-module and inter-module phase shift control is adopted to realize voltage sharing of a series side, reduce current ripples of a parallel side, reduce backflow power and improve the efficiency of the converter.

The invention discloses an FMQL20S-based navigation computer system and a software and hardware collaborative architecture, and relates to the field of computer systems. Comprising a programmable fusion chip JFMQL20S4841, a 1553B transceiver and isolation transformer 6, an ARINC429 transceiver 7, a self-isolation RS422 chip 8, a self-isolation RS232 chip 9, an RC resistance-capacitance filter 10, an RS422 first interface chip 11, an RS422 second interface chip 15, an RS422 third interface chip 16 and an RS422 fourth interface chip 17. The method is used for solving the prominent defects of high design cost, poor universality, time-consuming calculation, incapability of miniaturization and the like due to the fact that various performance indexes such as fusion of different sensors and calculation of a large amount of data need to be realized in the current navigation computer system design.

The invention discloses an auxiliary power supply and an energy storage system. The auxiliary power supply comprises an input interface, at least two switch modules, an isolation transformer, an output module, a control module and a driving module. The input interface is configured to access a power supply module, the output module is configured to access a load, and working voltages of different switch modules are different; the isolation transformer comprises at least two primary sides and a secondary side coupled with the primary sides, different primary sides have different inductance values, each primary side is connected with the input interface through one switch module, the secondary side is electrically connected with the output module, and the control module is connected with the input interface and each switch module and is configured to detect the power supply voltage of the input interface; the control module is connected with each switch module and outputs a target control signal according to the power supply voltage, the driving module is connected with the control module and each switch module and is used for driving the target switch module to work according to the target control signal, and the target switch module is one of the switch modules. Therefore, the auxiliary power supply can stably and efficiently work in a wide working voltage range.

The invention relates to an expandable distributed voltage controller, and relates to the technical field of power grid electric energy management, the expandable distributed voltage controller comprises a series-parallel module comprising a parallel converter, a first series converter, a first DC capacitor and an isolation transformer, the DC side of the parallel converter is connected with the DC side of the first series converter through the first DC capacitor, and the DC side of the first series converter is connected with the isolation transformer through the isolation transformer; the alternating current side of the series converter is connected in series to the power grid side through the isolation transformer; and the series connection module comprises a second series connection converter, a second direct current capacitor and an isolation transformer, the second direct current capacitor is arranged on the direct current side of the second series connection converter, and the second series connection converter is connected to the load and / or the grid connection position in series through the isolation transformer. A plurality of problems can be solved while the power quality problem of the power grid is governed, so that the application range is wider.

A motor power source regulation circuit, a control method and an electronic device are provided. The motor power source regulation circuit includes a power factor correction circuit, an isolation circuit, a first power source conversion circuit, a second power source conversion circuit and a control circuit. The isolation circuit includes a first switch sub-circuit and an isolation transformer. The power factor correction circuit regulates an AC input signal to a first DC signal. The first switch sub-circuit converts the first DC signal to a first AC signal. The isolation transformer converts the first AC signal to two or more second AC signals. The first power source conversion circuit converts the second AC signal to a DC drive signal and outputs it to a DC motor. The second power source conversion circuit converts the second AC signal to an AC drive signal and outputs it to an AC motor.

The present invention discloses a power supply and distribution system for a high-voltage power transformer on-site detection vehicle. The on-board mobile power supply (hereinafter referred to as "on-board power supply") is connected in parallel with the 12V DC power consumption part and the 220V AC power consumption part through the No. 1 isolating switch, the inverter power supply, and the switching power supply, and is connected in parallel with the 12V DC power consumption part through the No. 2 isolating switch; the external power supply (hereinafter referred to as "mains power") is connected in parallel with the 12V DC power consumption part, the 220V AC power consumption part, and the on-board power supply through the isolation transformer, the No. 1 isolating switch, the inverter power supply, and the switching power supply, and is connected in parallel with the 220V AC power consumption part through the No. 2 isolating switch, and is connected in parallel with the ceiling air conditioner; the automobile generator is connected in parallel with the on-board power supply through the dual battery isolation controller, and is connected in parallel with the 12V DC power consumption part through the No. 2 isolating switch. The present invention has the advantages of flexible operation, wide application, and complementary advantages.

The invention relates to the technical field of voltage sampling, and discloses a high-voltage direct-current bus voltage isolation sampling circuit which comprises an isolation transformer, an N-MOS tube, a digital-to-analog converter and an MCU. The input end of the MCU is connected with the output end of the digital-to-analog converter, the driving output end of the MCU is connected with the grid electrode of the N-MOS tube, a rectangular wave signal with a preset frequency is output to the grid electrode of the N-MOS tube, and the N-MOS tube is controlled to be switched on at a high level and switched off at a low level, so that the N-MOS tube is switched off after being switched on in each period of the rectangular wave signal, and the output end of the MCU is connected with the grid electrode of the N-MOS tube. And the secondary side of the isolation transformer generates a secondary side coupling voltage, so that after the digital-to-analog converter converts and outputs the digital signal, the sampling voltage of the high-voltage direct-current bus is obtained based on the digital signal.

The present invention belongs to the technical field of power electronic converters and discloses a medium-voltage distribution network flexible interconnection switch topology and control method. The medium-voltage distribution network flexible interconnection switch topology provided by the present invention includes three connected reactors L1, three connected reactors L3, two chain-type STATCOMs, two three-phase isolation transformers, two three-phase LC filters, two three-phase inverter circuits, and a DC port. Back-to-back three-phase converters are introduced at the ends of the chain-type STATCOMs of two feeders. Through the back-to-back three-phase converters, active power flow mutualization between the two medium-voltage chain-type STATCOMs, that is, between two different feeders, can be achieved. The present invention can achieve DC capacitor voltage balancing of the chain-type STATCOM submodules of the two feeders. Compared with the BTB-VSC commonly used in existing medium-voltage distribution network flexible interconnection demonstration projects, this solution has lower cost, simpler topology, easier control, and does not need to consider the active and reactive power decoupling issues between interconnected feeders, making it easy to promote and apply on a large scale.

The present disclosure relates to circuits for connecting components of a hydrogen plant to a power grid to power the components in an efficient manner. In one implementation, a power-side alternating current (AC) / direct current (DC) converter can be connected to a source power grid without the need for an isolation transformer by providing a separate bus between the power-side AC / DC converter and the load-side DC / DC converter, instead of a DC bus shared between the converters. Other implementations for connecting components of a hydrogen plant to a power grid may include an adjustable transformer, such as a tap-changing transformer or an autotransformer, for connecting any number of auxiliary loads of the plant to the power grid. The adjustable transformer may accommodate various types of auxiliary load devices for connecting to the power provided simultaneously by the transformer, including both three-phase and one-phase devices.

The utility model discloses a direct-current converter based on an asymmetric three-level bridge arm circuit, which comprises a direct-current bus, the asymmetric three-level bridge arm circuit connected with the direct-current bus in parallel, a resonance circuit, an isolation transformer and a rectifying circuit, the asymmetric three-level bridge arm circuit comprises a voltage dividing capacitor, a clamping circuit, a flying capacitor C3 and a half-bridge inverter. According to the direct-current converter, the connection points of the resonant circuits are changed, so that voltage sharing of the voltage-dividing capacitors is realized, the problem of neutral point imbalance caused by characteristic difference of a driving chip and a switching tube in the traditional half-bridge three-level converter is effectively solved, and the direct-current converter is higher in response speed and higher in control precision.

The invention discloses a hybrid distributed power flow controller topological structure and a control method thereof. The topological structure comprises a distribution network Sen transformer DST and a distributed static synchronous series compensator DSSC. The distribution network Sen transformer DST comprises a three-phase double-winding transformer and an on-load tap changer group; each phase of the three-phase double-winding transformer comprises a main winding and a secondary winding, the high-voltage end of the three-phase main winding is connected with the head end of the three-phase distribution line, the low-voltage end of the three-phase main winding is in star connection, and the neutral point of the three-phase main winding is grounded; the on-load voltage regulation switch group comprises six on-load voltage regulation switches which are respectively configured on the low-voltage side of the three-phase main winding and the three-phase secondary winding and provide three-phase first compensation voltage in a cross series connection mode; a distributed static synchronous series compensator DSSC provides a three-phase second compensation voltage; and the three-phase first compensation voltage and the three-phase second compensation voltage are superposed to synthesize a three-phase compensation voltage, and the three-phase compensation voltage is injected into a three-phase distribution line through a three-phase isolation transformer. The invention provides a series hybrid topology consisting of a DST (Digital Subscriber Terminal) and a DSSC (Digital Subscriber Subscriber Center).

The invention provides a vehicle-mounted charging circuit, a charging method and a charging system for an electric vehicle facing a 800V power battery, and relates to the field of manufacturing of related facilities of the electric vehicle, the circuit comprises a power factor correction module, a primary side power conversion module, a high-frequency isolation transformer, a bipolar charging module and a power battery equalization module; the input side of the power factor correction module is connected with an alternating current power grid, and the power factor correction module is used for rectifying alternating current into direct current; the primary side power conversion module is used for converting the direct current output by the power factor correction module into high-frequency alternating current; the high-frequency isolation transformer comprises at least two windings, and the two windings are connected with the primary side power conversion module and the bipolar charging module respectively; the bipolar charging module is connected with a 800V power battery, and the 800V power battery comprises two groups of 400V battery packs; the power battery equalization module is used for equalization management of two groups of 400V battery packs, and has the advantages of improving charging speed and efficiency of 800V power batteries and reducing equalization difficulty and cost.

The invention discloses an LLC converter rectification output current estimation method. According to the method, the rectification output current is estimated based on a model by sampling the output voltage of the LLC converter and the primary side alternating current of the isolation transformer. According to the method, a rectification output current sensor with a large size can be prevented from being adopted, the situation that the performance of the converter is reduced due to the fact that parasitic parameters are introduced is avoided, the power density of the converter is improved, meanwhile, universality is achieved, and the method can be suitable for various LLC converter topologies including two-level or multi-level full bridges, half bridges and the like.

The invention discloses an intelligent switching control electrician practical training identification device, which belongs to the technical field of electrical detection and comprises a practical training platform, an operation panel, an electrical carrier plate and a built-in PLC (Programmable Logic Controller), the system integrates power input, a first conversion unit composed of a first isolation transformer and a first contactor, a second conversion unit composed of a second isolation transformer and a second contactor, a control unit, a data storage module, an operation input unit, a feedback unit and a load output unit. A dual-safety interlocking structure combining software interlocking and contactor hardware interlocking is realized through a PLC, and two paths of power outputs cannot be switched on at the same time. The device has the functions of intelligent mode switching, real-time voltage monitoring, fusing and sudden stop dual protection, operation state feedback and practical training data storage, meets industrial-grade and safety-grade practical training requirements, is compact in structure and high in safety, supports closed-loop control and data tracing, and is suitable for modern electrician skill training and intelligent examination and identification.

The invention provides a wireless electric energy transmission system for multiplexing a receiving end, which is used for solving the problems of volume redundancy and energy loss superposition of the receiving end caused by a cascade architecture of a wireless charging module and an isolated DC-DC converter. Comprising a transmitting end, a receiving end and an auxiliary end, the transmitting end comprises a transmitting coil, the receiving end comprises a receiving coil, and the auxiliary end comprises an auxiliary winding; the transmitting coil and the receiving coil are DD type coils, the auxiliary winding is a Q type coil, and the receiving coil and the auxiliary winding are arranged in a stacked mode. By multiplexing the receiving end, the transmission of electric energy from the transmitting end to the power battery of the receiving end can be realized, the isolated step-down wireless charging from the power battery of the receiving end to the auxiliary power supply of the auxiliary end can also be realized, the two working modes are decoupled through the design of the coupling mechanism and the state switching of the switching tube, and a traditional isolation transformer is replaced; safety of high-voltage power supply and auxiliary power supply circuits is guaranteed, and system power density is improved.

The invention discloses a high-power modular radio frequency power amplifier capable of realizing wide-range power regulation. The high-power modular radio frequency power amplifier comprises a radio frequency load RL and m power amplification modules, the m power amplification modules are connected in parallel at a direct current side and are connected with an adjustable direct current bus voltage source; and the m power amplification modules are connected in parallel at the alternating current side and are superposed at the alternating current side. The output current of all the power amplification modules is transmitted to the radio frequency load RL; each power amplification module comprises a high-frequency switch power amplification unit, an LCL resonance network and an isolation transformer. According to the invention, through the configuration of the number of the power amplification modules and the adjustable cooperative control of the DC bus voltage source, the continuous adjustment of the output power is realized, meanwhile, the stable operation of each power amplification module under the resonance condition is ensured, the zero-voltage switching state is maintained, and the overall operation efficiency of the architecture and the adaptability of the radio frequency load are effectively improved.

The intrinsically safe power supply comprises a safety isolation transformer, a fuse, a rectification filtering and reverse connection prevention circuit, a lightning protection circuit, a surge and overvoltage protection circuit, a DC / DC conversion circuit and a two-stage overcurrent and overvoltage protection circuit. An R-type safety isolation transformer is matched with a primary side fuse and a secondary side fuse to provide a reliable SELV power supply, a DC / DC circuit is formed based on an LM2676-ADJ chip, a two-stage over-current and over-voltage rapid turn-off protection circuit is formed through a surge protection chip ADM1270, and the nonlinear rectangular power supply output characteristic is provided. The two-stage TVS is arranged at the input end of the DC / DC circuit and the input end of the ADM1270 chip and matched with the fuse for protection, the fuse is fused under the condition that the input voltage is abnormal or the DC / DC fails, the overvoltage protection effect is achieved, and the safety of the chip and the reliability of the power supply are ensured.

The utility model discloses a power supply and a system used for nuclear fusion field anti-configuration. The power supply comprises a DC power supply, an inverter, a multi-output isolation transformer and N resonant branches. The direct-current power supply is electrically connected with the inverter; the inverter is used for converting the direct current into alternating current; the inverter is connected with the input end of the multi-output isolation transformer; and a plurality of output ends of the multi-output isolation transformer are respectively connected with one resonant branch. Structural improvement is carried out on the basis of a traditional field inversion configuration power supply technology, the charging function of capacitors of all branches of a coil is achieved through a transformer, all the branches are isolated from one another in the charging process, and mutual interference and influence are avoided; and meanwhile, the safety of other branches is not influenced when a single branch fails or is damaged in the working process.