561results about "Ac-ac conversion" patented technology

A converter (2) supplies a load (3) with electrical energy from a supply network (4). Using a desired power (P1*) of the load (3) and a state (Z) of the supply network (4), a control device (9) of the converter (2) determines a power (P2*) to be output by the converter (2) to the load (3). The control device (9) determines, using the power (P2*) to be output, control signals (C, C1, C2) for the converter (2) and controls the converter (2) by means of the control signals (C, C1, C2) such that the converter (2) outputs the power (P2*) to be output to the load (3). The control device (9) determines the state (Z) of the supply network (4) using variables (UZK, a, f) on which the determination of the control signals (C, C1, C2) is based.

A single-stage AC-to-DC resonant converter is used to convert a three-phase AC power source into a DC power source. The single-stage AC-to-DC resonant converter includes a primary-side circuit, a resonant circuit, and a secondary-side circuit. The primary-side circuit includes three primary-side switch circuits, and each primary-side switch circuit is coupled to one phase of the three-phase AC power source. The resonant circuit includes three transformers, and primary-side windings of the transformers are respectively coupled to the primary-side switch circuits, and secondary-side windings of the transformers are coupled to the secondary-side circuit.

The invention discloses a high-efficiency converter for adjusting the voltage of a power grid, and belongs to the technical field of power electronics. The converter comprises a first voltage regulation circuit, a second voltage regulation circuit, a filter circuit, a detection circuit and a control circuit. By detecting the amplitude difference between the power grid voltage and the load voltage, the control circuit automatically switches the Buck working mode or the Boost working mode, and stable alternating current output in a wide input voltage range is achieved. The invention has the advantages of compact structure, high efficiency, fast response, small harmonic wave and the like, and is suitable for industrial and civil occasions with large-range fluctuation and frequent power grid voltage.

The embodiment of the invention provides a current sharing control method and an AC-DC conversion system, the current sharing control method is applied to a current sharing controller, the current sharing controller is used for controlling the working state of an AC-DC converter, the AC-DC converter comprises at least two rectification units, and the at least two rectification units adopt a combination of a bridge topology structure and an LLC resonant tank; comprising the steps of determining a target adjustment phase according to absolute values of three-phase input voltage instantaneous values of at least two rectification units; according to the current sampling values of the at least two rectification units, a target duty ratio of a target adjustment phase in each rectification unit is determined, and the target duty ratio is used for indicating adjustment of the voltage gain of the LLC resonant tank; and adjusting the duty ratio of the control signal of the switching tube in each rectification unit according to the target duty ratio of the target adjustment phase in each rectification unit. According to the embodiment of the invention, the gain of the LLC is changed by adjusting the pulse width of the switching tube control signal in the rectification unit and adjusting the amplitude distribution of the input voltage of the resonant tank, so that the output current of the LLC is controlled, and the purpose of current sharing is achieved.

The invention discloses a high-efficiency single-stage bidirectional power conversion topological structure capable of realizing full-range soft switching and a control method of the high-efficiency single-stage bidirectional power conversion topological structure. In a single-stage bidirectional power conversion topology formed by double half bridges and a switch matrix, a controlled current source connected in parallel with a primary side of a second transformer is designed; the current on a bridge arm connected with the primary side of the second transformer can be effectively changed, so that the soft switching range of a switching tube on the bridge arm in a wide power transmission range is widened, and full-range soft switching in a power frequency period can be realized in any load range; the controlled current source is designed to only work before and after the switching moment of the primary side switching tube of the second transformer, the current stress of the switching tube can be effectively reduced, and meanwhile, the loss of the additional controlled current source is very small. According to the invention, the working range of the soft switching is widened, the additional loss caused by the soft switching is greatly reduced, higher efficiency and higher power density can be realized, and the cost advantage is realized.

The present specification relates to a coil module and a home appliance including the same. A home appliance according to one embodiment of the present invention may comprise: a coil module comprising a plurality of first coil units stacked in a vertical direction and comprising a plurality of working coils, and a plurality of second coil units stacked in the vertical direction, a plurality of second coil units including a plurality of sensing coils and a wiring pattern electrically connecting the terminal unit with the working coil or the terminal unit with the sensing coils, and arranged in a different layer from the plurality of first coil units; and a control unit that performs container detection by using the sensing coil, and controls driving of the working coil in accordance with a result of the container detection.

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.

A dryer is provided. The dryer includes an alternating current (AC) power supply configured to supply an input voltage, a rectifier configured to rectify the supplied input voltage, a power amplifier configured to amplify the rectified input voltage to provide an output voltage, a plurality of electrodes to which the output voltage is applied, a matching circuit, connected between the power amplifier and the plurality of electrodes, configured to correct a waveform of the output voltage provided from the power amplifier, memory storing instructions, and at least one processor, wherein the instructions, when executed by the at least one processor individually or collectively, cause the dryer to obtain a magnitude of the output voltage provided from the power amplifier, and detect a power value corresponding to the rectified input voltage, based on the magnitude of the output voltage provided from the power amplifier being less than or equal to a defined reference voltage.

The invention provides a current sharing control method and an AC-DC conversion system. The method comprises the steps that the method is applied to a current sharing controller, the current sharing controller is used for controlling the working state of an AC-DC converter, the AC-DC converter comprises at least two rectification units, and the at least two rectification units adopt the combination of a bridge topology structure and an LLC resonant tank; the method comprises the following steps: acquiring current sampling values of at least two rectification units; according to the current sampling values of the at least two rectification units, a target phase shift angle of each rectification unit is determined, and the target phase shift angle is used for indicating the duration when the input voltage of the LLC resonant tank is in a 0-level state; and according to the target phase shift angle of each rectification unit, controlling a control signal of a target switch tube in the bridge topology structure of each rectification unit to perform phase shift. According to the embodiment of the invention, the input voltage of the LLC resonant tank is 0 level by adjusting the phase shift angle of the switching tube in the rectification unit, so that the output current of each rectification unit is controlled, and the effect of current sharing of the outputs of the plurality of rectification units is achieved.

A hybrid converter control method for offshore wind power, an apparatus, a device and a storage medium. The method comprises the following steps: S1, assigning a reference initial value for an effective value of an alternating current bus voltage of a hybrid converter, an operating angular frequency of the hybrid converter, and a reference value of an MMC direct current voltage, and acquiring an alternating current bus voltage of the hybrid converter, an effective value of the alternating current bus voltage of the hybrid converter, and an MMC direct current voltage; S2, calculating d-axis and q-axis components of the alternating current bus voltage of the hybrid converter in a dq rotating coordinate system; S3, calculating a reference value of the effective value of the alternating current bus voltage of the hybrid converter; S4, calculating a reference value of an MMC modulation voltage in the dq rotating coordinate system; S5, calculating an MMC modulation voltage in a three-phase stationary coordinate system; and S6, on the basis of the MMC modulation voltage in the three-phase stationary coordinate system, performing pulse width modulation to obtain trigger pulses for IGBTs of the MMC, thereby implementing steady-state control on the hybrid converter.

The invention discloses a three-phase single-stage alternating-current and direct-current converter and a control method and device thereof, which are used for improving the conversion efficiency and the power density of the alternating-current and direct-current converter. The converter comprises a three-phase matrix switch circuit, a resonance circuit, an isolation circuit and a rectification circuit. The three-phase matrix switch circuit is connected with three-phase alternating current and comprises three switch branches which are independently arranged, each switch branch comprises an upper bridge arm and a lower bridge arm, the midpoint of the upper bridge arm and the midpoint of the lower bridge arm in each switch branch are connected with one phase of alternating current input, and each bridge arm comprises a bidirectional switch assembly or two switch assemblies which are reversely connected in series; the resonant circuit comprises a resonant capacitor, a resonant inductor and an excitation inductor which are connected in series, and is connected between the common endpoint of the upper bridge arms and the common endpoint of the lower bridge arms of the three switch branches; one side of the isolation circuit is connected with the resonance circuit, and the other side is connected with the rectification circuit; and the rectification circuit comprises at least two switch assemblies, the input side is connected with the isolation circuit, and the output side is connected with load equipment.

A resilient power router system with simplified connection to various energy sources, including batteries, renewable energy sources, and broader grid power, as well as various loads, including data centers. The multiport power router dynamically adjusts power provided from the various power sources and to the various loads, especially to for medium voltage applications. The multiport design enables scalability to multi-megawatt (MW) and medium voltage levels.

A control method for a refrigeration cycle circuit allowing circulation of a working fluid containing a refrigerant component capable of undergoing a disproportionation reaction includes interrupting or limiting an operation of the refrigeration cycle circuit in response to detecting a sign of the disproportionation reaction based on at least one of a first state regarding a drive circuit for driving a compressor of the refrigeration cycle circuit or a second state regarding the working fluid.

The invention discloses an on-load voltage regulation distribution transformer with series converter chains bearing partial power, which is characterized by comprising a group of three-phase series converter chains and a three-phase industrial frequency transformer, the three-phase series converter chain is used for three-phase voltage regulation and comprises three converter sub-chains and N4 three-phase converter sink chains, and N4 is equal to 0 or 1; the three-phase industrial frequency transformer is used for isolating and reducing voltage and providing an energy transfer port for maintaining energy conservation of the three-phase series converter chain, the three-phase industrial frequency transformer comprises 3N0 + 3N1 + 3N2 + 3N2 + 3N4 primary windings and three secondary windings, and N0 is greater than or equal to 0; the invention solves the problems of short service life of the contact and power supply interruption of the sensitive load, and realizes continuous voltage regulation with lower equipment cost.

The utility model discloses a converter system, and relates to the technical field of vehicle engineering. The converter system comprises a converter body formed by cascading a plurality of same basic power subunits, the input end of the converter body is used for being directly connected with a single-phase traction network, and the output end of the converter body is used for independently driving a plurality of traction motors. The output end of the converter body is provided with a three-phase output filter capacitor. According to the converter system, the basic power subunits are cascaded to form the converter main body, so that the current-carrying capability and the voltage endurance capability can be improved; and the output end of the converter main body is provided with a three-phase output filter capacitor, so that when the transformer main body outputs voltage to drive the traction motor, the torque ripple and electromagnetic noise of the traction motor can be reduced.

A current sharing control method and an AC-DC conversion system are provided. The method is applied to a current sharing controller configured to control an operating state of an AC-DC converter comprising at least two rectification units. Each of the at least two rectification units is in a bridge topology combined with an LLC resonant tank. The method comprises: determining a target adjustment phase based on the absolute values of instantaneous values of three-phase input voltages of the at least two rectification units; determining a target duty cycle of the target adjustment phase in each of the rectification units based on the current sampling values of the at least two rectification units; and adjusting, based on the target duty cycle of the target adjustment phase in each of the rectification units, a duty cycle of a control signal for a switch in each of the rectification units.

The objective is to reduce carrier ripple current and to reduce the outflow of carrier ripple current to the power supply. [Solution] The power converter 50 includes a rectifier circuit 2 that converts the three-phase AC input voltage (phase-to-phase voltage Vac) input from AC input terminals 55r, 55s, and 55t into a DC voltage; a converter 31 that outputs an output voltage Vo set to a set voltage value from the DC voltage output from the rectifier circuit 2; a smoothing capacitor 6 connected between the positive converter output terminal (DC output terminal 64p) and the negative converter output terminal (DC output terminal 64n) of the converter 31 that outputs the output voltage Vo; an LC filter 30 having a filter reactor 8 and a filter capacitor 9 arranged between the AC input terminals 55r, 55s, and 55t and the converter 31; and a controller 10 that controls the converter 31.

The invention provides a control method of a conversion circuit and a related device. Relates to the technical field of power electronics. The conversion circuit comprises an ACAC circuit, an isolation conversion unit and an ACDC circuit which are connected in sequence. The method comprises the following steps: controlling a first sub-switch of a first switch to be conducted ahead of a first sub-switch of a fourth switch at a first moment; at a second moment after the first moment, if the number of times that the alternating voltage crosses the zero point is an even number greater than or equal to 2, controlling a first sub-switch of the fourth switch to be conducted ahead of a first sub-switch of the first switch; and / or, the fifth switch is controlled to be conducted ahead of the eighth switch at the first moment; at a second moment after the first moment, if the number of times that the alternating voltage crosses the zero point is an integer greater than or equal to 1, controlling the eighth switch to be switched on ahead of the fifth switch; wherein the first moment and the second moment are both zero crossing point moments of the alternating voltage. The thermal balance of the power devices can be realized by controlling the power devices of the bridge arms through the method.

The utility model belongs to the technical field of electronic circuit, especially relates to a passive low harmonic frequency converter special for rail transit air conditioner. The frequency converter includes: passive filter module, rectifier module, precharge module, voltage-sharing filter module, inverter module and control module. The input end of passive filter module is connected to the output end of alternating -current source, and the output end is connected to the input end of rectifier module, and the output end of rectifier module is connected to the input end of precharge module, the output end of precharge module is connected to the input end of voltage-sharing filter module, the output end of voltage-sharing filter module is connected to the input end of inverter module, and the output end of inverter module is the voltage output end of passive low harmonic frequency converter special for rail transit air conditioner, and inverter module and control module are connected through inverter control and protection circuit. The utility model can reduce the harmonic interference of frequency converter inverter to input power grid, protects the electrical equipment on power grid, and improves the security of operation.

The application relates to a dual-motor control circuit, method and variable-frequency speed regulation system. A mode switching module is arranged, so that in the case of common bridge arm failure, the phase connected between the first motor, the second motor and the common bridge arm can be switched to be connected with the bus capacitor bridge arm, so that the inverter topology is converted from five bridge arms to four bridge arms. At this time, the variable-frequency speed regulation system can keep normal operation in the four-bridge-arm mode, and system shutdown caused by common bridge arm failure can be avoided.

We provide liquid-cooled thermal management solutions to improve volumetric power density for pulse load power converters and other applications where space is constrained. [Solution] A power converter using a liquid cooling system to cool a liquid-cooled transformer 100, wherein the coils 135 of the transformer 120 are in physical / thermal contact with a cold plate 160 embedded in a thermally conductive solid (epoxy or resin) and sandwiched between the coils and / or in contact with the outer surface of the coils. In addition / or, the cold plate may also be in physical / thermal contact with the transformer core. A cooling fluid is supplied so as to flow through the cold plate. In another embodiment, the transformer is immersed in a cooling fluid such as oil in a thermally controlled housing that houses the coils. The cold plate is in physical / thermal contact with the housing. The cooling fluid supplied into the cold plate conducts heat from the oil-surrounded transformer.

A control apparatus includes a first signal generator configured to generate a first reset signal for determining an on-time of a high-voltage side switch of a first phase of a multi-phase power converter; a first comparator configured to generate a first set signal for determining a conduction moment of the high-voltage side switch of the first phase based on comparing the first current sensing signal and the voltage control signal; a first zero-crossing detection circuit configured to detect a zero-crossing point of the inductive current of the first phase; and a first phase bias voltage generator configured to generate a first bias voltage for configuring the first phase to exit the first continuous conduction mode when a zero crossing point of the inductive current of the first phase is detected.

An electronic circuit includes a rectifier module and an energy storage module. The rectifier module includes a three-phase rectifier bridge including first, second, and third bridge arms connected in parallel to each other, and a bidirectional switch assembly including first, second, and third bidirectional switches. One ends of the first, second, and third bidirectional switches are connected to midpoints of the first, second, and third bridge arms, respectively. The energy storage module is connected to a direct-current output end of the rectifier module and includes two capacitors connected in series to each other. One of the two capacitors is connected in parallel to a direct-current load. Other ends of the first, second, and third bidirectional switches are connected between the two capacitors.

The invention provides a voltage ripple suppression model based on a zero-sequence alternating-current voltage injection method, a construction method of the model and a control method of the model. The voltage ripple suppression model based on the zero-sequence alternating-current voltage injection method is composed of a hexagonal converter. The construction method of the voltage ripple suppression model based on the zero-sequence AC voltage injection method comprises the following steps: establishing a hexagonal converter zero-sequence network power transmission model; establishing a hexagonal converter bridge arm power model; generating a positive sequence modulation signal; generating a direct-current zero-sequence modulation signal; and constructing a hexagonal converter voltage ripple suppression control module, and generating a zero-sequence alternating-current modulation signal. The control method of the voltage ripple suppression model based on the zero-sequence alternating-current voltage injection method comprises the step of superposing a positive-sequence alternating-current component, a zero-sequence direct-current component and a zero-sequence alternating-current component of an obtained modulation signal to generate the modulation signal with a voltage ripple suppression effect.

A power supply circuit and an energy storage device are provided. The power supply circuit includes a DC / DC conversion module, a first AC / DC conversion module, a second AC / DC conversion module, an alternating current input interface, a first alternating current output interface, and a second alternating current output interface. A first end of the first AC / DC conversion module is connected to a battery module through the DC / DC conversion module, a first end of the second AC / DC conversion module is connected to the first end of the first AC / DC conversion module through a direct current bus, the first alternating current output interface is connected to a second end of the first AC / DC conversion module and a first terminal of the alternating current input interface, the second alternating current output interface is connected to a second end of the second AC / DC conversion module, both the first AC / DC conversion module and the second AC / DC conversion module may operate in a rectification mode or an inversion mode, and the DC / DC conversion module operates in a discharging mode or a charging mode.

The utility model discloses a single-phase AC / AC converter which is used for realizing fine adjustment of output signals of a conversion circuit and improving the precision and stability of output AC signals. The circuit comprises a main control chip, a first sampling module, a second sampling module, a driving chip and a conversion circuit. The input end of the first sampling module and the input end of the second sampling module are used for receiving alternating current signals; the main control chip is connected with the output end of the first sampling circuit and the output end of the second sampling circuit; the output end of the main control chip is connected with the input end of the driving chip; the output end of the driving chip is connected with the input end of the conversion circuit, and the output end of the conversion circuit is used for outputting a final alternating current signal.

According to the present invention, a coil member includes a first coil electrode and a second coil electrode. Each of one or more capacitors includes a first capacitor electrode and a second capacitor electrode. The coil member has a greater mass than each of the one or more capacitors. Each of a first conductive member, a second conductive member, and a third conductive member includes a second upper surface and a second lower surface arranged in the vertical direction. Each of the first coil electrode and the second capacitor electrode is provided on the second upper surface of the first conductive member. The second coil electrode is provided on the second upper surface of the second conductive member. The first capacitor electrode is provided on the second upper surface of the third conductive member.

A switching control system, including: switch units, configured to separately receive one of alternating currents and couple to a load; a detection unit, configured to detect the alternating currents; and a control unit, configured to, after receiving a switching signal, and in response to detecting that a power supply alternating current and a backup alternating current are in a polarity half cycle and a voltage difference is less than a preset voltage, perform: closing a first turn-on direction of a power supply switch unit; opening a second turn-on direction of a backup switch unit; closing a second turn-on direction of the power supply switch unit; and opening a first turn-on direction of the backup switch unit; where the first turn-on direction is opposite to a direction of the polarity half cycle, and the second turn-on direction is the same as the direction of the polarity half cycle.

The present disclosure provides protection apparatus and methods for a driver. An example protection apparatus includes a meter, a loop unit, and a controller. The detection unit is configured to detect a current flowing through an inverter unit. The loop unit is configured to connect a positive terminal to a negative terminal of a DC bus or disconnect the positive terminal from the negative terminal of o the DC bus. The control unit is configured to, in response to power on of the driver, control the loop unit to connect the DC bus, and determine, based on a detection result of the detection unit, whether a three-phase AC power is connected to the three-phase motor wiring terminal, wherein in the case that a three-phase AC power is connected to the three-phase motor wiring terminal, the control unit stops.

The utility model discloses an AC-AC sine wave electronic transformer, which comprises a rectifier filter unit, an inverter unit, an output unit, a zero sampling unit and a control unit, and is characterized in that the rectifier filter unit is connected with the inverter unit; the output unit is connected with the inversion unit; the zero point sampling unit is used for collecting the input power grid frequency and the power grid zero-crossing position so as to obtain a sampling result; and the control unit is used for adjusting the inversion unit according to the sampling result so as to ensure that the output frequency and the phase are the same as the input power grid evaluation rate and the power grid zero-crossing position. By implementing the transformer disclosed by the utility model, the circuit design can be greatly simplified, and the energy loss is reduced, so that the conversion efficiency is improved, and the weight and the volume are reduced.