58 results about "Dc ac converter" patented technology

An onboard charging system for an electric vehicle includes a charging port configured to receive a single-phase AC power, a power outlet configured to provide the single-phase AC power to one or more external devices, a single-phase inverter connected to the power outlet and configured to provide power splitting functionality, a DC battery selectively coupled to the charging port, a bidirectional inverter configured to convert AC power to DC power and to convert DC power to AC power, the bidirectional inverter is selectively coupled to the battery, an electric motor coupled to the bidirectional inverter and selectively coupled to the charging port, a DC-AC converter selectively coupled to the electric motor and selectively coupled to the power outlet, and a DC-DC converter coupled to the DC-AC converter and selectively coupled to the battery.

The invention discloses a fuel cell power generation system and a control method thereof, and the system controls the current of a fuel cell stack through the following method on the architecture that one path is branched from a bus between the output of the fuel cell stack and a DCAC (direct current-direct current converter) to supply power to the DCDC (direct current-direct current converter). The method comprises the following steps: acquiring a first difference value between an actual power value of a grid-connected / load and a target power value, and generating a reference current variation based on the first difference value and a power controller; obtaining a target current value of the fuel cell stack, and generating a reference current value based on the reference current variable quantity and the target current value; acquiring an actual current value output by the fuel cell stack; obtaining a current control value based on the reference current value, the actual current value and a current controller; and the fuel cell stack is controlled based on the current control value, so that closed-loop control of the power of the fuel cell can be realized, the system architecture is simplified, the system efficiency is improved, and the dynamic response capability is enhanced.

A battery charging system for an electric vehicle including a dual use direct current to direct current converter including a direct current to alternating current converter and a transformer for generating a rotor winding current in response to a first direct current in a propulsion mode and for generating a charging current in response to a charging mode.

An electric propulsion system for an aircraft, comprising: - an electrical power source (1) including a synchronous generator (11) driven by a heat engine (12), - a first synchronous electric motor (3) connected to an output of the synchronous generator by an alternating current electrical circuit (2), - a rotating propulsion unit (7), characterized in that it comprises: - a direct current electrical circuit (4) comprising, from an input connected to the alternating current electrical circuit: a first alternating / direct current converter (41), a direct current electrical link (42) and a second direct / alternating converter (43), - a second electric motor (5) connected to an output of the direct / alternating converter, - a differential gear train (6) including a first input shaft (61) connected to the first synchronous electric motor,a second input shaft (62) connected to the second electric motor and an output shaft (63) connected to the rotating propulsion unit. Figure for the abbreviation: Figure 1,

A DC:DC converter includes: a DC:AC converter circuit having DC and AC sides; an AC:DC converter circuit having DC and sides; an AC link connecting the AC side of the DC:AC circuit and the AC side of the AC:DC converter circuit, the AC link including a transformer having a first winding connected to the AC side of the DC:AC converter circuit and a second winding connected to the AC side of the AC:DC converter; a capacitor; and a switch arrangement having a first state and a second state, wherein: in the first state, the capacitor is connected in series between the AC side of the DC:AC converter circuit and the first winding of the transformer; and in the second state, there is a current path between the AC side of the DC:AC converter circuit and the first winding of the transformer that does not include the capacitor.

A hybrid fuel cell system is disclosed. The hybrid fuel cell comprises a fuel cell adapted to supply power to a load. The hybrid fuel cell further comprises an Electrical Air Compressor (EAC) unit operatively coupled with the fuel cell. Also, the hybrid fuel cell comprises an auxiliary power source connected to the EAC unit via a Direct Current to Alternative Current (DC-AC) converter. Furthermore, the hybrid fuel cell comprises a converter circuit configured to perform at least one of enable the auxiliary power source to supplement the fuel cell to provide collective power supply to a load during the initialization phase of the fuel cell, enable the fuel cell to provide either the input power supply or a supplement power supply to the EAC unit during an operational phase of the fuel cell, or enable the fuel cell to charge the auxiliary power source.

The invention discloses a battery equalizer of a series battery pack. The battery equalizer comprises a plurality of unit circuits, an AC link and a DC / AC converter. The input ends of the plurality of unit circuits are connected in parallel and are connected with the AC link. And the output end of each unit circuit is connected with a corresponding battery in the battery pack. The DC / AC converter is connected with the AC link. Each unit circuit comprises an AC / DC converter, and the AC side of the AC / DC converter is coupled with the AC link capacitance of the input end of the unit circuit. Since the current drawn from the first stage is common to all cells, the charging or discharging of each cell is autonomously determined by the output current of the second stage.

A battery equalizer for a series-connected battery string. The battery equalizer contains a plurality of cell circuits, an AC link, and a DC / AC converter. The plurality of cell circuits at their input ends is connected in parallel with each other and to the AC link. Each cell circuit at its output end is adapted to connect to a corresponding battery cell of the battery string. The DC / AC converter connects to the AC link. Each of the cell circuits contains an AC / DC converter, and an AC side of the AC / DC converter is capacitively-coupled to the AC link at the input end of the cell circuit. As the current taken from the first stage is common to all battery cells, charging or discharging of individual battery cells is autonomously determined by the output current of the second stage.

When a DC power supply is connected to a single-phase power supply or a single-phase load via a DC-AC converter, extremely large power pulsations occur. Therefore, electrolytic capacitors, which can provide large capacitance, are widely used in smoothing circuits in DC power supplies. However, they have major issues with their vulnerability to temperature rise and short lifespan. [Solution] A smoothing capacitor circuit using a film capacitor with few lifespan issues is configured in parallel with the DC power supply circuit via a step-up or step-down DC / DC converter, and significant charge / discharge control of the capacitor is performed using switching control to suppress DC voltage pulsation, thereby realizing a capacitor with an equivalently large capacity and achieving the elimination of electrolytic capacitors.

A vehicle's power output architecture includes a power source and a DC-AC converter coupled to the power source. The DC-AC converter contains several switches and a first capacitor and a second capacitor, which are operationally coupled to the switches.

Electric vehicle (10), including: a charging port (304) configured to accept alternating current (AC) power; a power outlet (306) configured to provide AC power to one or more external devices; a direct current (DC) battery (208) which is selectively coupled to the charging port (304) via a first switch (S1) and a second switch (S2); a bidirectional inverter (316) configured to convert AC power to DC power and DC power to AC power, wherein the bidirectional inverter (316) is selectively coupled to the battery (208) via a third switch (S3), a fourth switch (S4) and a fifth switch (S5); an electric motor (310) which is coupled to the bidirectional converter (316) and is selectively coupled to the charging port (304) via a sixth switch (S6); a DC-AC converter (314) which is selectively connected to the electric motor (310) via a seventh switch (S7) and an eighth switch (S8) and via a ninth switch (S9), a tenth switch (S 10 ) and an eleventh switch (S 11 ) is selectively coupled to the socket (306); a DC-DC converter (312) coupled to the DC-AC converter (314) and via a twelfth switch (S 12 ) and a thirteenth switch (S 13 ) is selectively coupled to the battery (208); the charging port (304) via a fourteenth switch (S 14 ) is selectively coupled to the bidirectional inverter (316), the electric motor (310) or the DC-AC converter (314); and a processor (202) configured to operate the first switch (S1), the second switch (S2), the third switch (S3), the fourth switch (S4), the fifth switch (S5), the sixth switch (S6), the seventh switch (S7), the eighth switch (S e ), the ninth switch (S9), the tenth switch (S 10 ), of the eleventh switch (S 11 ), of the twelfth switch (S 12 ), of the thirteenth switch (S 13 ) and the fourteenth (p 14 ) control the switch based on an operating mode of the electric vehicle (10).

A an estimation arithmetic processing unit estimates an open circuit voltage and an internal resistance with respect to a charging rate of the secondary battery based on a charge-discharge voltage and a charge-discharge current of the secondary battery, and input-output power of the DC-AC converter, estimates efficiency of the DC-AC converter and power consumption of an auxiliary device of the DC-AC converter, and estimates charge-discharge energy efficiency with respect to the charging rate of the secondary battery and a rated input-output ratio on an AC side of the DC-AC converter based on the estimated open circuit voltage, the internal resistance, the efficiency of the DC-AC converter, and the power consumption of the auxiliary device of the DC-AC converter.

An onboard charging system for an electric vehicle comprising a charging port configured to receive an alternating current (AC) power, a power outlet, a direct current (DC) battery selectively coupled to the charging port via a first switch and a second switch, a bidirectional inverter selectively coupled to the battery via a third switch, a fourth switch, and a fifth switch, an electric motor coupled to the bidirectional inverter and selectively coupled to the charging port via a sixth switch, a DC-AC converter selectively coupled to the electric motor via a seventh switch and an eighth switch and selectively coupled to the power outlet via a ninth switch, a tenth switch, and an eleventh switch, and a DC-DC converter coupled to the DC-AC converter and selectively coupled to the battery via a twelfth switch and a thirteenth switch, the charging port selectively coupled to the battery.

An onboard charging system for an electric vehicle, comprising a charging port configured to accept alternating current (AC) power, a socket, a direct current (DC) battery selectively coupled to the charging port via a first switch and a second switch, a bidirectional inverter selectively coupled to the battery via a third switch, a fourth switch and a fifth switch, an electric motor coupled to the bidirectional inverter and selectively coupled to the charging port via a sixth switch, a DC-AC converter selectively coupled to the electric motor via a seventh switch and an eighth switch and selectively coupled to the socket via a ninth switch, a tenth switch and an eleventh switch, and a DC-DC converter.which is coupled to the DC-AC converter and is selectively coupled to the battery via a twelfth switch and a thirteenth switch, with the charging port being selectively coupled to the battery.

The present invention relates to a current sensor core (1) which enables the current of three phases compatible with DC-AC converters used in electric vehicles to be measured. A current sensor core (1) wherein the reading error and possible noise are minimized, and which enables the current of three phases compatible with DC- AC converters used in electric vehicles to be measured is realized by means of the invention. The current sensor core (1) comprises a compact nested structure.

The invention discloses a thermal mass energy storage system power grading adjustment method based on virtual asynchronous machine control, and belongs to the technical field of thermal mass energy storage systems, and the method comprises the steps: converting the alternating current output by a power grid side into direct current in the process of injecting power into a thermal mass energy storage system by the power grid side based on a virtual asynchronous machine control method; according to the direct current-alternating current converter control method based on the V / f control strategy, power frequency alternating current of a power grid is improved to high-frequency alternating current so as to be matched with power pulsation of a heat storage device side; electric energy of high-frequency alternating current is converted into heat energy to be stored by a heat and mass energy storage system based on Rankine cycle; different heat capacity intervals are divided for the current heat mass energy storage working medium temperature according to the heat mass energy storage device, the virtual inertia coefficient of the virtual asynchronous machine is adjusted, an adjustment instruction is output based on the electric power level, and the power injected or released into the heat mass energy storage system is dynamically adjusted. According to the method, power dynamic balance and frequency support between the power grid and the Rankine cycle heat and mass energy storage system are realized.

A converter arrangement (1) for transmitting electrical power between a phase of a three-phase or multi-phase electrical network (4) and a DC bus (5) is described. The invention relates to a DC / AC converter (2), which can be connected to an electrical network (4) via a sine filter (7) and to a DC bus (5) via a DC-side separate intermediate circuit, a converter bridge (8) of the DC / AC converter (2) being connected to a midpoint (M) of the intermediate circuit; and a rectifier (3) connected in parallel with the DC / AC converter (2). The DC / AC converter (2) has a control device (10) which is designed to operate the DC / AC converter (2) in an overmodulation if the voltage value of the DC bus (5) is lower than twice the amplitude of one of the phase voltages of the network (4).

The invention relates to a hybrid electric propulsion system (200) for a turbojet engine, comprising:-a first permanent magnet synchronous motor (230) connected to a DC-AC converter (231) and intended to be connected to a high-pressure shaft (222) of the turbojet engine; -a hybrid excitation generator (240) comprising a brushless synchronous motor (242), a second permanent magnet synchronous motor (241) connected in series with said brushless synchronous motor, and a bridge rectifier (243) connected to said brushless synchronous motor, said hybrid excitation generator being intended to be connected to a low-pressure shaft (212) of a turbojet engine, and the brushless synchronous motor comprises a generator (3421), an exciter (3422), a rotating diode placed between the generator and the exciter, and a DC-DC converter (244) connected to the exciter; -an energy storage system (250); and-a DC power supply network connected to the DC-AC converter and to the bridge rectifier.

An uninterruptible power supply apparatus includes an AC / DC converter that converts AC power supplied from a commercial AC power supply into DC power and supplies the DC power to a DC line, a DC / AC converter that converts the DC power received from the DC line into AC power and supplies the AC power to a load, a DC / DC converter that provides and receives DC power between the DC line and a battery, and a bidirectional converter that, in high-speed charging of the battery, operates in cooperation with the AC / DC converter, converts the AC power supplied from the commercial AC power supply into DC power, and supplies the DC power to the DC line. This can prevent a shortage of DC power during a high-speed charging operation and enables high-speed charging of the battery while supplying rated power to the load.

An outlet power architecture for a vehicle includes a power source and a direct current to alternating current (DC-AC) converter coupled to the power source. The DC-AC converter includes a plurality of switches and a first capacitor and a second capacitor operably coupled to the plurality of switches.

The invention discloses an equalization system and equalization equipment thereof. A battery equalization master control module in the equipment obtains battery voltage in an energy storage system and determines target equalization voltage according to the battery voltage. The battery equalization control units are in one-to-one correspondence and connection with the battery plug-in boxes of the energy storage system, are also connected with the battery equalization master control module, and collect real-time voltages of the corresponding battery plug-in boxes; the DC-AC converters are connected with the battery equalization control units in a one-to-one correspondence manner and are also connected with the corresponding battery subracks, and the AC ends of the DC-AC converters are connected with an AC power supply; the battery equalization master control module obtains an equalization strategy of each battery plug-in box according to the target equalization voltage and each real-time voltage, equalizes each battery plug-in box, realizes the equalization operation of each battery plug-in box in the energy storage system, cooperates with each battery equalization control unit, automatically and accurately equalizes the batteries in the battery plug-in boxes, and improves the battery equalization efficiency. The equalization reliability is improved and the maintenance difficulty is reduced; synchronous equalization is carried out on a plurality of battery subracks, and equalization efficiency is improved.

A substrate processing system includes a substrate support and a power supply circuit. The substrate support is configured to support a substrate, wherein the substrate support comprises one or more heating elements. The power supply circuit includes: a direct current-to-alternating current converter configured to convert a first direct current voltage to a first alternating current voltage, where the direct current-to-alternating current converter comprises at least one switch; and an isolation circuit comprising one of a coupled inductor or a transformer. The one of the coupled inductor or the transformer is configured to convert the first alternating current voltage to and second alternating current voltage and isolate the one or more heating elements from an earth ground. The power supply circuit is configured to provide an output voltage to the one or more heating elements based on the second alternating current voltage.

The utility model discloses a wind and light storage combined energy supply system for a transformer substation, which comprises a solar energy conversion module, a wind energy conversion module and an electric energy storage module which are used for being electrically connected with a power utilization end, and further comprises a control switch I electrically connected with the solar energy conversion module, a direct current / alternating current converter electrically connected with the control switch I, and a control switch II electrically connected with the electric energy storage module, the direct current / alternating current converter is connected with a solar energy conversion module, the steering gear is connected with an intermediate node of the direct current / alternating current converter, and the control unit is connected with the intermediate node of the direct current / alternating current converter. The steering gear controls the orientation of a solar cell panel in the solar energy conversion module and the sunlight, and therefore light energy is utilized to generate electricity with the maximum efficiency.

An energy storage apparatus, including a plurality of battery modules, a switch unit, a start unit; and an electrical energy output port. The energy storage apparatus is configured for use in a photovoltaic power generation system having a plurality of photovoltaic modules, a direct current-to-direct current (DC / DC) converter, and a direct current-to-alternating current (DC / AC) converter. The plurality of battery modules is separately connected to the start unit and the switch unit, and the plurality of battery modules are configured to, when the start unit receives a start signal, control the switch unit to be turned on. The energy storage apparatus is configured to, in response to the switch unit being turned on, output electrical energy of the plurality of battery modules through the electrical energy output port, and, in response to the switch unit being turned off, disconnect the plurality of battery modules from the electrical energy output port.

An apparatus including a first AC-to-DC converter, a first DC-to-AC converter and a second AC-to-DC converter, the first AC-to-DC converter connected with a low voltage arm of a high voltage divider to obtain a voltage measurement signal, the first DC-to-AC converter configured to output a modulated signal of the voltage measurement signal, the second AC-to-DC converter configured to output a demodulated signal of the voltage measurement signal; a high-frequency transformer including a primary coil connected with an output terminal end of the first DC-to-AC converter and a secondary coil connected with an input terminal of the second AC-to-DC converter; and a controller configured to control switching devices of the first DC-to-AC converter to control a turn-on sequence of each switching device, to calculate signal parameters, and to output the calculated signal parameters.

Disclosed are a quick charging device for charging a plurality of battery packs and a quick charging method using the same, and more particularly a quick charging device for charging a plurality of battery packs, the quick charging device including a positive electrode high-voltage terminal configured to supply voltage, a negative electrode high-voltage terminal configured to supply voltage, a plurality of DC / AC converters connected to each of the positive electrode high-voltage terminal and the negative electrode high-voltage terminal, a plurality of variable AC autotransformers connected respectively to the plurality of DC / AC converters, each of the variable AC autotransformers being configured to adjust a voltage value, a plurality of AC / DC converters connected respectively to the plurality of variable AC autotransformers, a plurality of resistor modules connected respectively to the plurality of AC / DC converters, and a controller connected to each of the variable AC autotransformers, the controller being configured to control the voltage value of each of the variable AC autotransformers.

Hybrid electric system for powering electrical equipment of an aircraft from a turbomachine Hybrid electric system (8) for powering electrical equipment of an aircraft from a turbomachine (1) comprising an HP shaft (7) and an LP shaft (3), the system (8) comprising a control unit (20), two electrical machines (9, 10) each with two windings, and two electrical distribution control units (12) connected at the output to a continuous HV electrical network (16) and to electrical loads (14), one of the machines (9) being connected to the HP shaft (7) and the other machine (10) being connected to the LP shaft (3). And, for each control unit (12), a first bidirectional DC-AC converter (13) connected between a winding of the first machine (9) and the control unit (12), and a second bidirectional DC-AC converter (15) connected between a winding of the second machine (10) and the control unit (12).For each control unit (12), it comprises a continuous HV battery (17) and a third bidirectional DC-DC converter (18) connected between the battery (17) and the control unit (12), the control unit (20) controlling the three converters (13, 15, 18) to maintain a voltage quality of the network (16) within a voltage gauge. Figure for the abstract: Fig. 1.

A power conversion device is disclosed that can be shared by batteries with different output voltages. This power conversion device converts a battery's output voltage into an alternating voltage or a direct voltage lower than the battery's output voltage and comprises a multi-winding transformer (1), a first DC-AC converter (11), and a second DC-AC converter (12), the DC sides of which are connected to the battery. In a case where the battery's output voltage exceeds the voltage rating of semiconductor switching elements, the respective DC inputs of the first DC-AC converter (11) and the second DC-AC converter (12) are connected in series.In a case where the output voltage of the battery is less than the voltage rating, the respective DC inputs of the first DC-AC converter (11) and the second DC-AC converter (12) are connected in parallel or only one of the DC inputs of the first DC-AC converter (11) and the DC inputs of the second DC-AC converter (12) is connected to the battery.

The invention relates to the technical field of vehicles, in particular to a discharging circuit, a power control method and a vehicle. The discharging circuit comprises a power battery, a controller, a direct current-alternating current (DC-AC) converter and at least two power supply ports. The power battery is electrically connected with the DC-AC converter, and the DC-AC converter is electrically connected with each power supply port; the power battery is used for supplying power to each power supply port through the DC-AC converter; the power supply port is used for supplying power to a load; the controller is used for adjusting the second power supply power output by the DC-AC converter to enable the first power supply power to be smaller than the maximum allowable power supply power under the condition that the first power supply power of the target power supply port for supplying power to the load exceeds the maximum allowable power supply power of the target power supply port; wherein the target power supply port is one of the at least two power supply ports. According to the technical scheme, the safety and stability of the vehicle power supply process are improved while normal outward power supply of the vehicle is guaranteed.

A plasma power control device enabling independent control of high frequency pulse amplitude, and a plasma generation facility including same are provided, the plasma power control device providing high frequency. The power control device comprises: an AC / DC converter electrically connected to a power source; a DC / DC converter electrically connected to an output of the AC / DC converter; a DC / AC converter electrically connected to an output of the DC / DC converter; and a controller for controlling at least one of switches of the DC / DC converter on the basis of an output of the DC / AC converter.