674results about "Dc-ac conversion without reversal" patented technology

The enclosure and / or mounting framework for a modular multilevel energy system includes a set of similar cabinets configured for orthogonal alignment of modules. The cabinets are configured so that modules of a particular phase are oriented along an axis parallel to a reference plane. Modules of the same level but different phases of the multilevel arrangement are mounted within each cabinet and positioned so that the modules for each phase are at a defined distance from the reference plane. The cabinets are positioned equidistant and orthogonal to the reference plane, minimizing the distance for connections between modules of the same phase across multiple cabinets and facilitating convenient addition or removal of levels. The framework also facilitates data and reference signal connections between the modules' local control devices and between the local control devices and a master control device for the system.

The invention discloses an inverter bus ripple active suppression method and system. The method comprises the following steps: collecting bus voltage and current, and extracting a broadband ripple frequency spectrum; inputting the broadband ripple frequency spectrum and the operation data of the inverter into a physical degradation model, and predicting the service life state of the electrolytic capacitor; a dynamic frequency tolerance threshold matrix is constructed through the predicted service life state of the electrolytic capacitor, and a sensitive frequency band of the electrolytic capacitor is identified; threat degree evaluation is carried out on each sensitive frequency band, and a frequency-varying virtual impedance network used for inverting a compensation voltage reference instruction is constructed according to an evaluation result; and according to the generated compensation voltage reference instruction, an inverter power switch tube is driven to generate corresponding compensation voltage. The system is used for implementing the method. The beneficial effects of the invention are that the ripple suppression is converted into a dynamic complementation problem between the capacitance physical impedance degradation amount and the inverter virtual impedance compensation amount, and the reliability and economical efficiency of an inverter system are greatly improved.

The application discloses a power supply circuit and an uninterruptible power supply, which comprises a commercial power access branch, a battery access branch and a rectifier unit; the battery access branch comprises a battery relay and a thyristor; the first end of the battery relay is connected with a battery power supply, and the second end thereof is connected with the input end of the rectifier unit; the first end of the thyristor is connected with the first end of the battery relay, and the second end thereof is connected with the second end of the battery relay; the commercial power access branch comprises a commercial power relay and a first capacitor; the first end of the commercial power relay is connected with a commercial power supply, and the second end thereof is connected with the second end of the battery relay; the first end of the first capacitor is connected with the first end of the commercial power relay, and the second end thereof is connected with the second end of the commercial power relay; when the commercial power relay is attracted, the first capacitor maintains the voltage continuity between the two ends of the commercial power relay, so as to inhibit the voltage change rate between the two ends of the thyristor. When the battery is switched to the commercial power, the voltage change rate between the two ends of the thyristor is inhibited by the first capacitor, so that the thyristor is prevented from being mis-conducted.

The application provides a grid-connected inverter and a control method and controller thereof, and relates to the technical field of inverter control. The method comprises the following steps: detecting the variation characteristics of the output port voltage of the grid-connected inverter; judging whether the grid-connected inverter is in a weak power grid environment based on the variation characteristics; and controlling the grid-connected inverter to output capacitive reactive power to improve the active power output capability of the grid-connected inverter in the case that the grid-connected inverter is in the weak power grid environment. The application can solve the problem of poor stability of the grid-connected inverter in a weak power grid.

This invention discloses an integrated charging and testing method, system, and circuit for inverter relay self-testing and DC bus pre-charging. The method comprises five core steps: capacitor charge discharge, initial state verification, self-testing and phased pre-charging of phase relay sticking faults, self-testing of relay closure faults, and completion of self-testing and pre-charging. Phased pre-charging of the DC bus is simultaneously completed during the relay self-testing process, achieving integrated charging and testing. This invention can complete relay fault judgment and precise location using only voltage sampling, eliminating the need for additional current sensors; relays A and B in the same series can share drive signals, reducing the control chain; and zero-differential voltage retraction of the relays is achieved through controllable semiconductor switches, eliminating current surges. This invention significantly shortens inverter start-up time, reduces hardware costs, and improves system operational reliability.

To provide an electric motor driving device having a two-inverter configuration in which an output of an electric motor is stabilized and the continuity is maintained at a time of switching between a one-side driving mode and a both-side driving mode.SOLUTION: An electric motor driving device controls driving of an electric motor that has a winding wire to which two inverters connected to a power source are connected. A switching arbitration unit 303 determines switching between a one-side driving mode in which either one of two inverters 60, 70 is switchingly driven and a both-side driving mode in which both the inverters 60, 70 are switchingly driven, and arbitrates outputs of the respective inverters 60, 70 at the switching time so as to continue an output of the electric motor before and after driving mode switching. The switching arbitration unit 303 slightly changes a power amount of the inverter on the driving start side to increase from zero at the switching time from the one-side driving mode to the both-side driving mode, and slightly changes a power amount of the inverter on the driving end side to decrease to zero at the switching time from the both-side driving mode to the one-side driving mode.SELECTED DRAWING: Figure 4

The application discloses a composite photovoltaic inverter, which comprises a DC-DC boost conversion module, a DC-AC inversion module and a three-port circuit. The three-port circuit comprises a first port, a second port and a third port. The first port is used for being connected with a first photovoltaic component string group in a photovoltaic array. The second port is an input port of the DC-DC boost conversion module and is used for being connected with a second photovoltaic component string group in the photovoltaic array. The third port is an input port of the DC-AC inversion module. The composite photovoltaic inverter is further provided with a second control module. A bypass diode or a relay is connected in parallel on the DC-DC boost conversion module. The control mode of a DC-DC sub-control module of the second control module comprises two working modes, i.e. a boost compensation mode and a bypass mode. The application can maximize the overall efficiency of the photovoltaic array under a complex distributed photovoltaic power station scene, reduces the cost and solves the mismatching problem of the component level and the string level.

This application provides a method for expanding the operating region and optimizing the power of a PT-symmetric WPT system based on load regulation. The steps are as follows: acquiring the system's circuit parameters and setting the system's minimum transmission efficiency threshold; performing zero-phase angle control on the high-frequency inverter at the transmitting end; calculating the target equivalent load value with the minimum critical coupling coefficient and maximum output power within the PT symmetric region, and calculating the phase shift duty cycle of the rectifier bridge when the equivalent load at the rectifier bridge input is equal to the target equivalent load value; the receiving end detects the system's operating frequency in real time, and determines whether the system is in a PT symmetric state or a PT broken state based on the operating frequency and the natural frequency; when the system is in a PT symmetric state, the rectifier bridge is controlled; when the system is in a PT broken state, the target equivalent load value is calculated based on the maximum output power tracking, and the phase shift duty cycle of the rectifier bridge when the target equivalent load value is equal to the target equivalent load value is calculated to control the rectifier bridge. This application can maintain efficient and stable power transmission capability under a wide range of load and coupling variations.

The utility model is suitable for the technical field of inverters, and provides a power device, an inverter device and electronic equipment. The power device comprises a heat dissipation substrate; the IGBT module is arranged on the heat dissipation substrate; the PCB is arranged on the side, opposite to the heat dissipation substrate, of the IGBT module, the PCB is provided with a groove, the IGBT module is provided with a pin, the position of the groove corresponds to the position of the pin, and the pin penetrates through the groove; the flexible connecting plate is arranged on one side, opposite to the IGBT module, of the PCB, and the flexible connecting plate is electrically connected with the IGBT module and the PCB; wherein the flexible connecting plate is respectively welded with the PCB and the IGBT module, so that the IGBT module is electrically connected with the PCB. According to the utility model, mutual stress between the IGBT module and the PCB can be absorbed through the flexible connecting plate, so that flexible connection between the PCB and the IGBT module can be realized, reduction of mechanical stress caused by thermal expansion and cold contraction or vibration is facilitated, and the effect of improving the reliability of electrical connection between the PCB and the IGBT module is achieved.

A compressor drive device includes an inverter device including an inverter circuit that converts direct current into alternating current and a control portion, and a compressor including a motor connected to the inverter circuit and a piston that reciprocates in a cylinder under the action of the motor. The control portion includes a multi-phase PWM signal generation portion that can set a plurality of carrier frequencies for driving the compressor, and a bottom dead center detection portion that detects a bottom dead center of the piston in the compressor. In a case where the carrier frequency is switched from a high frequency to a low frequency during rotation of the compressor, the timing of the switching is made to be the bottom dead center of the compressor. Thus, generation of overcurrent can be well suppressed when the carrier frequency is switched.

The application discloses a voltage stabilizing protection circuit, a power supply system and electronic equipment, and relates to the technical field of circuits, wherein the voltage stabilizing protection circuit comprises an input module, a current limiting module, a reference source module and a sampling module; the current limiting module comprises a comparator and a current limiting tube, the comparator is connected with the current limiting tube; the comparator is connected with the input module, the reference source module and the sampling module respectively; and the current limiting tube is connected with the input module. Compared with the related art, the application can realize real-time sampling of the working condition of the power supply interface based on the reference voltage output by the reference source module through the current limiting module, and can realize reverse modulation of the output power of the power supply interface based on the adjustment operation of the control signal, so that the complexity of the current limiting protection circuit is greatly reduced, the efficiency of the current limiting protection is improved, and the application has wide applicability.

To provide a power conversion device which can stabilize AC voltage of a distribution line.SOLUTION: An uninterruptible power supply device 6 comprises: a converter 11 which converts AC power to be received from a distribution line 4 into DC power; an inverter 13 which converts the DC power into the AC power to be supplied to a load 8; and a control device 15 which controls the converter 11 to absorb reactive power for compensating a changed portion ΔVS of AC voltage VS of the distribution line 4 from the distribution line 4 when the AC voltage VS of the distribution line 4 changes.SELECTED DRAWING: Figure 2

Charging device comprising: a battery (106) suitable and configured to store DC voltage; first and second motors (101, 102) suitable and configured to operate as a motor or a generator; first and second inverters (103, 104) suitable and configured to operate the first and second motors (101, 102); a voltage transformer (105) suitable and configured to increase the DC voltage of the battery (106) to supply it to the first and second inverters (103, 104) and to increase the DC voltage of the inverter to supply it to the battery (106); and a charging controller (200) suitable and configured to operate the first and second inverters (103, 104) as a booster or generator.to operate voltage amplifiers or to operate the voltage transformer (105) as a step-down converter, according to a voltage which is input via a neutral point of the first and second motors (101, 102) and the voltage of the battery (106), wherein the charging control element (200) is configured to switch off the voltage transformer (105) so that the voltage which is increased by the first inverter (103) or the second inverter (104) charges the battery (106) when the voltage which is input via the neutral point of the first and second motors (101, 102) is less than the battery voltage.

The embodiment of the application discloses an inverter and a photovoltaic power generation system, wherein the inverter can be applied to a photovoltaic scene, a vehicle-mounted scene and the like. The inverter comprises a shell, a device group and an infrared temperature measurement component. The device group and the infrared temperature measurement component are arranged in the shell, wherein the infrared temperature measurement component is used for temperature monitoring of the device group. The infrared temperature measurement component is a non-contact temperature measurement component, has a wide measurement range, can simultaneously perform temperature detection on multiple devices, can greatly improve the comprehensiveness of temperature detection, and can reduce the situation that some devices are missed in monitoring, for example, a bus capacitor, a conductive copper bar and the like.

To provide a power conversion device having small element loss while achieving a high voltage utilization ratio and phase voltage without distortion.SOLUTION: A power conversion device 10 comprises: a three-phase inverter 20 having first to third legs each having first and second switching elements connected in serial between a first terminal and a second terminal to which a DC electric signal is input; a single phase inverter having a fourth leg 21n with first and second switching elements connected between a first terminal and a second terminal in serial; and a control circuit 40 that inputs a control signal to each of the first and second switching elements provided in each of the first to fourth legs to switch conduction of the switching element. The control circuit 40 inputs, to each of the first and second switching elements, a signal generated by comparing first to third modulated signal waves in which the first to third signal waves corresponding to the first to third legs are modulated in two phases with a transfer wave as a control signal.SELECTED DRAWING: Figure 1

A semiconductor module is included in two inverters connected to a common rotating electric machine. The module has a first semiconductor element, a second semiconductor element, a first current path, and a second current path. The first semiconductor element is in a first inverter, and the second semiconductor element is in a second inverter. The second inverter has at least part of an ON period that overlaps with the ON period of the first semiconductor element. The first current path includes the first semiconductor element, and the second current path includes the second semiconductor element. The second semiconductor element is adjacent to the first semiconductor element in a predetermined direction. The first and second current paths are disposed side by side in the predetermined direction, with opposite current flow directions through the first and second current paths.

A motor drive device (1) according to the present disclosure comprises a heat sink (3) that cools a power module (2). The heat sink comprises: a base (4) having a first surface (7) on which the power module is provided and a second surface (8) located on the opposite side from the first surface; a plurality of fins (5) arranged in parallel on the second surface; and a cover (6) having a facing wall part (9) that faces the second surface and is disposed such that the plurality of fins are located between the facing wall part and the base, a first side wall part (10) that closes the gap between the ends of the base and the facing wall part on one end side in the arrangement direction of the plurality of fins, and a second side wall part (11) that closes the gap between the ends of the base and the facing wall part on the other end side in the arrangement direction. In a tubular body (13) formed by the base and the cover, a gap between adjacent fins is defined as a flow path (14) through which a fluid passes, and the base and / or the facing wall part has a communicating port (17) that connects the flow path with the outside of the tubular body.

Provided is a technology capable of detecting, with high accuracy, an abnormality or damage of a power conversion device using a simple configuration. A power conversion device 1 comprising power semiconductor modules 3a to 3f having switching elements, the power conversion device 1 comprising: gate drive circuits 4a to 4f for driving the switching elements and outputting feedback signals corresponding to the switching operations of the switching elements; a control unit 13 for outputting PWM command signals for switching to the gate drive circuits; a logic unit 16 for calculating the phase data of a load current waveform; a feedback signal abnormality detection unit 12 for logically determining the PWM command signals and the feedback signals and accumulating mismatched time-series data; and a parameter computation unit 15 for converting the mismatched time-series data into phases and calculating the degree of damage to the power semiconductor modules on the basis of the phase distribution of the mismatch frequency.

A shield plate is used for reducing an influence that noise generated from a power conversion module has on a control board, and the shield plate is fastened to a resin member provided with a busbar by screw fixation from above. Thus, these are provided as separate members and the number of components increases, so that there is a problem in decrease in the number of assembly steps and size reduction. In the present disclosure, a DC busbar positive electrode, a DC busbar negative electrode, and a shield plate are stacked with non-conductive members interposed therebetween, and are integrated together with AC busbars and sensor cores by resin, to form a busbar assembly. The busbar assembly is provided between the power conversion module and the control board.

The application discloses a power converter, a power supply system, a control method and related devices. The power converter comprises an impedance network and a three-phase power conversion circuit, each phase of the three-phase power conversion circuit comprising a four-switch Buck-Boost circuit; the DC side of the three-phase power conversion circuit is used for connecting a DC source, and the AC side of the three-phase power conversion circuit is used for connecting a load or a power grid; wherein the load adopts star connection, and the power grid adopts star connection; the first end of the impedance network is connected to the positive pole of the DC side of the three-phase power conversion circuit, and the second end of the impedance network is used for connecting the neutral point of the load or the neutral point of the power grid. In the embodiment of the application, in the case that the power converter is switched from three-phase three-wire system to three-phase four-wire system, the impedance network is connected between the N line (the DC side of the three-phase power conversion circuit and the neutral point of the load or the neutral point of the power grid), the inrush current on the N line is reduced, and the risk of damage of the switching device in the power converter is reduced.

The application discloses a filter circuit, a photovoltaic inverter and a photovoltaic system, and belongs to the technical field of power electronics. The filter circuit comprises an inductive component, a plurality of first capacitors, a plurality of second capacitors and at least one on-off switching unit. The inductive component comprises a negative winding and a plurality of positive windings, a negative input terminal is used for being electrically connected with the negative poles of a plurality of direct current sources, and positive input terminals are used for being electrically connected with the positive poles of the direct current sources respectively. The first end of each first capacitor is electrically connected with the negative input terminal, and the second end of the first capacitor is electrically connected with the corresponding positive input terminal. The first end of each second capacitor is electrically connected with a negative output terminal, and the second end of the second capacitor is electrically connected with the corresponding positive output terminal. The on-off switching unit is arranged on a target line formed by the positive winding, the corresponding first capacitor and the corresponding second capacitor, and the on-off switching unit makes the target line open when the corresponding direct current source has no output power. The amplitude of the differential mode inductance reduction is reduced, and the differential mode filtering effect is improved.

This application discloses a power converter, a control method, and related devices. The power converter includes a controller and a three-phase power conversion circuit. Each phase of the three-phase power conversion circuit includes a four-switch Buck-Boost circuit and an AC-side capacitor. One or two phases of the three-phase power conversion circuit operate in single-phase mode. The AC side of the power conversion circuit operating in single-phase mode is used to connect to a single-phase load or a single-phase power grid. The AC side of the power conversion circuit not operating in single-phase mode is not connected to a load or power grid. The controller controls the power conversion circuit not operating in single-phase mode to allow the fluctuating current of the DC-side capacitor to flow into the AC-side capacitor of the power conversion circuit not operating in single-phase mode. This can avoid damage to DC-side components caused by low-frequency voltage fluctuations on the DC side and reduce the component damage rate.

A double-sided cooling type power module according to the present invention includes: an upper substrate including an insulating layer, an upper metal layer bonded to a top of the insulating layer, and a lower metal layer bonded to a bottom of the insulating layer; a lower substrate disposed under the upper substrate and including an insulating layer, an upper metal layer bonded to a top of the insulating layer, and a lower metal layer bonded to a bottom of the insulating layer; a spacer disposed between the upper substrate and the lower substrate and electrically connecting the upper substrate and the lower substrate; and a semiconductor chip disposed between the spacer and the upper substrate or the lower substrate, in which the insulating layers are made of a material of which a coefficient of thermal expansion is 0.8 or more and 1.2 or less times of coefficients of thermal expansion of the metal layers of the upper substrate and the lower substrate.

To suppress deterioration of a SiC-MOSFET.SOLUTION: A driving device switches a first SiC-MOSFET and a second SiC-MOSFET alternately with a dead time in which the first SiC-MOSFET and the second SiC-MOSFET connected in serial are turned off provided in-between, and comprises: a first driving circuit that sets a gate voltage of the first SiC-MOSFET to a first intermediate voltage higher than a first negative power supply voltage and lower than a first threshold value voltage of the first SiC-MOSFET in the dead time; and a second driving circuit that sets the gate voltage of the second SiC-MOSFET to a second intermediate voltage higher than a second negative power supply voltage and lower than a second threshold value voltage of the second SiC-MOSFET in the dead time.SELECTED DRAWING: Figure 1

The application provides an AC / DC integrated shore power supply control method and system, and relates to the technical field of ship shore power supply.The application realizes flexible and efficient power supply and charging for different types of ships such as AC ships, DC pure electric ships and DC hybrid power ships through the collaborative control of DC / AC inverters and DC / DC rectifiers.In addition, the application can significantly reduce voltage fluctuation and current impact during AC / DC power supply of the shore power supply system, improve the stability and reliability of power supply, reduce damage to electrical equipment, and prolong the service life of the equipment.In real scenarios, the application can be applied to port shore power supply systems to ensure the safety of ship power supply, reduce the impact on the power grid, and improve energy utilization efficiency.Meanwhile, the application combines deep reinforcement learning with power electronic systems, breaks through the limitations of traditional'model-dependent control', and provides a replicable solution for intelligent control of multi-port energy systems such as ship power distribution and microgrids.

The application provides a power converter, a controller, a power supply system and a midpoint voltage deviation control method, which are applied to the technical field of power electronics, and the power converter comprises a power conversion module, a main control module and at least two DC bus capacitors, each DC bus capacitor is connected in series between the positive electrode of a DC bus and the negative electrode of the DC bus, and since the midpoint voltage deviation suppression strategy in the related art can only achieve good midpoint deviation suppression effect when the bus voltage is high, the main control module increases the bus voltage when the voltage deviation between the capacitance voltage of at least one DC bus capacitor and the target capacitance voltage is greater than the first preset deviation threshold, thereby providing guarantee for the midpoint voltage deviation suppression strategy to achieve better midpoint deviation suppression effect, improving the midpoint deviation suppression effect and significantly improving the stability of the power supply system.

The application provides an explosion-proof box and an inverter. The explosion-proof box comprises a box body having a bottom plate, a first side plate and a second side plate; a box cover having a first edge and a second edge; a plurality of first adapters and a plurality of second adapters connected between the box body and the box cover; a first adapter is arranged between the end of the first side plate, the end of the second side plate, the end of the first edge and the end of the second edge; a second adapter is arranged between the middle of the first side plate and the middle of the first edge; and the middle of the second edge forms a reserved part. When the pressure inside the box body increases to a certain degree, the reserved part can be deformed under the action of the pressure, and the part of the second side plate close to the reserved part can also be deformed under the action of the pressure, so that a gas permeable gap is formed between the reserved part and the second side plate, the gas inside the box body is allowed to be discharged outside the box body through the gas permeable gap, the whole box cover is prevented from flying out of the box body, the safety performance is improved, and the explosion-proof effect is achieved.

An induction generator (2) is configured for driving an induction circuit (4), in particular for driving an induction coil of an induction hob (30). The induction generator (2) comprises: a power supply unit (8) configured to provide an input voltage (Vi) with respect to a common voltage (Vc); a driving unit (10) configured to provide a first and a second transistor driving voltage (Vg1, Vg2); a half-bridge arrangement (12) comprising a first transistor and a second transistor (14, 16) connected to each other at a middle node (22), wherein the first and second transistors (14, 16) are connected between the input voltage (Vi) and the common voltage (Vc), wherein the first transistor driving voltage (Vg1) is applied to the gate of the first transistor (14), and wherein the second transistor driving voltage (Vg2) is applied to the gate of the second transistor (16); a resonance circuit (4) comprising an induction coil element (6) being electrically connected at one end to the middle node (22) and being configured to emit an electromagnetic field when in operation; a control unit (20) having an output configured to supply a control signal to the driving unit (10) and having an input electrically connected to the middle node (22) configured for sensing the middle voltage (Vm) at the middle node. The control unit (20) is configured to apply the control signal at a setpoint frequency to the driving unit (10) such that via the first and second transistor driving voltages (Vg1, Vg2) a temporal switching sequence is implemented where the first transistor (14) is switched on and off and the second transistor (16) is switched on and off with a delay period (To) between switching off the first transistor (14) and switching on the second transistor (16). The control unit is further configured to detect the middle voltage (Vm) and / or the complimentary middle voltage (Vm*); and to evaluate the amplitude of the middle voltage (Vm) or the temporal behavior of the middle voltage (Vm) in relation to the switching off of the first transistor (14) and / or in relation to the switching on of the second transistor (16), and / or to evaluate the amplitude of the complimentary middle voltage (Vm*) or the temporal behavior of the complimentary middle voltage (Vm*) in relation to the switching off of the second transistor (16) and / or in relation to the switching on of the first transistor (14). The control unit is further configured to increase or to decrease or to maintain the setpoint frequency of the switching sequence being applied via the control signal in dependency of the evaluation. Alternatively or additionally the control unit is further configured to increase or to decrease or to maintain an on-time ratio (Ta / Tb or Tb / Ta), where within a switching sequence Ta is the duration of switching on the first transistor (14) and Tb is the duration of switching on the second transistor (16).

Power semiconductor device (11) comprising: a circuit body having a pair of conductor components (32, 33) and a power semiconductor element (35, 36) embedded between the pair of conductor components (32, 33); a substrate (25) in which a through-hole (27) is formed; and a sealing material (13) sealing at least a section of both the circuit body and the substrate (25), wherein the circuit body is inserted into the through-hole (27) and has a first exposed surface (51) and a second exposed surface (52) that are exposed by the sealing material (13), and the substrate (25) in the through-hole (27) has a first projection (28) and a second projection (29) that project towards a center of the through-hole (27) and are connected to the circuit body.wherein the first projection (28) and the second projection (29) are formed at opposite positions in the through-hole (27) and the first projection (28) and / or the second projection (29) are terminals that transfer energy to the power semiconductor element (35, 36), and wherein the power semiconductor device (11) is characterized in that an AC wiring (64) which is installed in the substrate (25) and the second projection (29) are arranged such that they are opposite each other in the substrate (25).