932results about "Ac-dc conversion" patented technology

A method includes receiving an indication of a charging current received at an on-board charging circuit of a vehicle from a source having a charging voltage. The on-board charging circuit includes a multi-phase traction motor, an inverter electrically coupled to the multi-phase traction motor and including an upper set of switching elements and a lower set of switching elements, and an energy storage device (ESD) electrically coupled to the inverter and having a storage voltage. The method includes determining whether the charging voltage is greater than or equal to the storage voltage. When the charging voltage is greater than or equal to the storage voltage, the method includes instructing at least one switching element in the upper set to operate in an on state and all of the switching elements in the lower set in an off state to cause fast charging of the ESD using the charging current.

A pre-charge sequence for a flying capacitor converter of a wireless power system is disclosed. An example method includes determining that a ground assembly of the system is connected to an electric grid and is not receiving power. The ground assembly comprises (1) a first switch leg comprising first, second, third, and fourth switches connected in series between first and second voltage source terminals, (2) a flying capacitor connected at a first node between the first and second switches and at a second node between the third and fourth switches, and (3) a DC link capacitor. The method includes executing a flying capacitor pre-charge sequence comprising: switching on the first and fourth switches; determining that the flying capacitor has reached a threshold voltage; and in response, switching off the first and fourth switches.

The invention discloses a control method and device of a braking device and the braking device, which are used for reducing the cost of a braking assembly of a multi-level inverter. The braking device comprises a first braking assembly, a second braking assembly and at least one third braking assembly. The first brake assembly, the at least one third brake assembly and the second brake assembly are connected in series; the first brake assembly is connected with a first bus capacitor in the inverter in parallel, the second brake assembly is connected with the last bus capacitor in the inverter in parallel, and each third brake assembly is connected with two bus capacitors in the inverter in parallel; the first brake assembly and the second brake assembly comprise bridge arms, the upper bridge arm of the first brake assembly and the lower bridge arm of the second brake assembly are diodes, and the diodes are connected with a brake resistor in parallel; each third brake assembly comprises a first bridge arm and a second bridge arm which are connected in series, a lower bridge arm of the first bridge arm and an upper bridge arm of the second bridge arm are diodes, and at least one brake resistor is connected between the lower bridge arm of the first bridge arm and the upper bridge arm of the second bridge arm in parallel.

An electronic device may include an inverter. The inverter may receive switching signals based on a dithered clock signal and output corresponding alternating current signals to a wireless power transfer coil. The dithered clock signal may have a plurality of frequency steps during a repeated cycle of the dithered clock signal. The repeated cycle of the dithered clock signal may comprise a step function that approximates a triangular waveform with steps having unique frequency magnitudes during the repeated cycle.

A power supply includes a converter circuit, a switching circuit and a control circuit. The converter circuit includes a transformer, a primary side switch and a secondary side switch. The switching circuit includes first and second capacitors, first and second sets of switches. In a first phase, the primary side switch is in the conduction state, causing a magnetizing inductor of the transformer to store energy. In a second phase, the primary side switch is in the off state, causing the magnetizing inductor to release the energy. In a first mode of the second phase, a first amount of the energy is transferred through the first set of switches to the first capacitor. In a second mode of the second phase, a second amount of energy is transferred to the second capacitor through the second set of switches.

An electronic device configured to transfer wireless power to an additional electronic device can include a wireless power transfer coil; an inverter configured to receive switching signals based on a dithered clock signal and output corresponding alternating current signals to the wireless power transfer coil; and control circuitry that generates the dithered clock signal. The dithered clock signal can have a plurality of frequency steps. A duty cycle of the switching signals can be different between at least two different frequency steps of the plurality of frequency steps to compensate for different gains of the wireless power transfer from the electronic device to the additional electronic device at the at least two different frequency steps.

The present disclosure relates to a method of controlling a grid-connected voltage source converter, VSC, using power-synchronisation control, wherein the method comprises: determining a VSC current vector (i) based on a VSC phase angle (θ) which is determined based on an integration of a power control error, determining an active power producing current component idref of a reference current vector (iref) based on an active power reference (Pref) for the VSC, determining the reference current vector (iref) based on the active power producing current component idref, determining a damping component based on a virtual damping resistance (Ra), the reference current vector (iref) and the VSC current vector (i), determining a voltage vector (v) based on a VSC voltage magnitude (V) and the damping component, and controlling the VSC based on the voltage vector (v).

An electronic circuit board assembly includes a support plate having opposite first and second sides, a first printed circuit board mounted to the first side, and a second printed circuit board mounted to the second side. The support plate includes first mounting features for the first printed circuit board, second mounting features for the second circuit board, and third mounting features configured to connect the support plate to an invertor housing enclosure. A connector pin is over-molded in the support plate and extends the through the support plate, projecting in opposite directions outwardly from the first side and the second side. The connector pin is electrically connected to both the first and second printed circuit boards, and electrically connects at least one first electronic component attached to the first circuit board to at least one second electronic component attached to the second circuit board.

A vehicle charging switching method. When a first charging circuit is used to perform direct current charging on a power battery, before switching to a second charging circuit to perform boost charging on the power battery, a charging controller controls the first charging circuit to pre-charge a pre-charging unit in the second charging circuit, and upon detecting that a voltage of the pre-charging unit matches a voltage of the power battery, controls the second charging circuit to perform boost charging on the power battery. A vehicle charging switching system, a computer-readable storage medium, a charging controller, and a vehicle.

This application relates to a power module unit, an energy storage valve module, an energy storage valve, and an energy storage device. The power module unit includes an upper bridge arm switching tube and a lower bridge arm switching tube connected in series; where a load capacity operating parameter of the upper bridge arm switching tube is greater than a load capacity operating parameter of the lower bridge arm switching tube. It can be seen that embodiments of this application achieve an asymmetrically configured power module unit, which, while meeting the load capacity requirements of the power module unit for the upper and lower bridge arm switching tubes, can not only improve the utilization rate of the lower bridge arm switching tube but also save the cost of components in the power module unit, thereby facilitating cost savings for the energy storage valve module.

A power supply apparatus (100) comprises an inverter (110), voltage and current measuring devices (120a, 120b), a temperature sensor (130), and an operation circuit (140). The inverter (110) comprises change-over switches (SW1-SW6). The voltage and current measuring devices (120a, 120b) are configured to measure the voltage (V1) and the current (I1) on the change-over switches (SW1-SW6). The temperature sensor (130) is configured to measure an initial temperature (T[0]) in an initial state. The operation circuit (140) is coupled to the voltage and current measuring devices (120a, 120b) and the temperature sensor (130). The operation circuit (140) is configured to: execute a power model (142), and calculate a first transient power of the change-over switches (SW1-SW6) on the basis of the initial temperature (T[0]), the voltage (V1), and the current (I1); and execute a thermal model (144), and calculate a first transient ideal temperature of the change-over switches (SW1-SW6) on basis of the first transient power. The power supply apparatus (100) calculates, in real time, the transient temperature of channel interfaces of the change-over switches (SW1-SW6) by measuring the voltage (V1) and the current (I1) on the change-over switches (SW1-SW6) of the inverter (110). The present invention also relates to a temperature measurement method (500) for a power supply apparatus, and an electrical system (ES1).

The application relates to a commercial power conversion circuit, method, device and storage medium. The commercial power conversion circuit comprises a rectifier circuit, a control circuit and an open circuit; an input end of the rectifier circuit is used for being connected with a commercial power grid, and an output end is connected with a first end of the open circuit; a second end of the open circuit is used for being connected with an electronic device, and a control end is connected with the control circuit; the control circuit is used for acquiring a working voltage of the electronic device and a rectified voltage output by the rectifier circuit; and the control circuit is further used for controlling the open circuit to conduct the connection between the rectifier circuit and the electronic device according to the working voltage and / or the rectified voltage. The commercial power conversion circuit realizes efficient power supply in a low-voltage section. Meanwhile, compared with a traditional technical solution, the commercial power conversion circuit does not need an auxiliary winding, and a power supply low-voltage section is a fixed value set according to the demand of the electronic device, so that the circuit is further simplified, the cost is reduced, and the circuit reliability is improved.

The application discloses a kind of minimal UKF-three vector model-free predictive control method and device of three-level rectifier, comprising: collecting net side three-phase voltage and current signal, establishes discretization hyperlocal mathematical model;Minimal UKF is used to carry out real-time state observation to lumped disturbance quantity, and output disturbance estimation identification value;Based on the principle of no difference shot control, combined with disturbance estimation identification value is fed forward to compensate, generates reference voltage instruction;Determine the sector where reference voltage is located, and determine three basic voltage vectors and their action time of main vector, secondary vector and redundant small vector;Generate seven-segment type modulation sequence with negative small vector as starting vector, center symmetry;Build only include midpoint potential deviation term's no weight cost function;Introduce small vector distribution factor, and optimal positive, negative small vector action time is obtained by traversing optimization;Generate PWM drive signal.The application does not depend on system accurate parameter, and has low calculation complexity and high control performance, and robustness is excellent.

The present invention relates to a capacitor, in particular an intermediate circuit capacitor, comprising a first capacitive unit and a second capacitive unit, a first electrode with a first electrical conductor and a second electrical conductor, a second electrode with a third electrical conductor, wherein the first capacitive unit and the second capacitive unit are arranged side by side and separated from each other by a gap, wherein the first electrical conductor is configured to electrically contact the first capacitive unit at a first top surface, wherein the second electrical conductor is configured to electrically contact the second capacitive unit at a second top surface, and wherein the third electrical conductor is configured to electrically contact the first capacitive unit at a first bottom surface and the second capacitive unit at a second bottom surface.wherein the second electrical conductor is arranged in the gap between the first capacitive unit and the second capacitive unit in order to prevent the propagation of electromagnetic waves between the first capacitive unit and the second capacitive unit.

The application belongs to the technical field of electric power, and provides a grid-connected converter control method and device, electronic equipment and storage medium. The method comprises the following steps: obtaining a DC side voltage of a grid-connected converter; calculating an outer voltage loop output value according to the DC side voltage and a preset DC side voltage given value; determining an adjustment value according to the DC side voltage and a pre-calculated damping coefficient; adjusting the outer voltage loop output value based on the adjustment value to obtain an active current given value of an inner current loop, and controlling the grid-connected converter according to the active current given value of the inner current loop. The application can improve the DC side damping characteristics of the grid-connected converter and enhance the system stability.

The present disclosure aims to provide a semiconductor device that can suppress unintended activation of control power supply voltage drop protection during the initial charging period, and can also perform control power supply voltage drop protection during the control power supply voltage stabilization period. [Solution] The semiconductor device 100 according to the embodiment includes an IGBT 41, a control IC 1, a control IC 2A, and a bootstrap circuit 3 that generates a control power supply voltage VccU supplied to the control IC 1 by a bootstrap operation using a control power supply voltage VccL supplied to the control IC 2A. The control IC 2A has a control voltage detection circuit 22A that detects a decrease in the control power supply voltage VccL, and the control voltage detection circuit 22A has a period detection circuit 221A that detects an initial charging period for initially charging the bootstrap circuit 3 by a bootstrap operation.

Method and apparatus for operating a charger with electromechanical switching elements (Sx), wherein a faulty electromechanical switching element (Sx) in the charger (100) is detected as a function of a current determined by means of one of the current sensors (Ax) and an error signal (F) is output after detection of a faulty electromechanical switching element (Sx).

This invention relates to a method for operating a modular brake regulator (1), wherein the modular brake regulator (1) has at least two brake regulator branches (15), each of which has at least one submodule (2) and a brake resistor (3); wherein the brake regulator branches (15) are arranged in a parallel circuit, and wherein at least two of the brake regulator branches (15) generate an alternating component (u) by means of the corresponding at least one submodule (2). BR,aDC voltage (u) BR ), wherein the alternating component (u) of each brake regulator branch (15) BR,aDC The phase offset between them, where n corresponds to the number of the braking regulator branches (15) that generate the voltage; where all alternating components (u BR,aDC The amplitudes are the same, and it is designed to convert the electrical energy absorbed by the modular brake regulator (1) over time into heat in the brake resistor (3). Furthermore, the invention relates to a control device (10) configured to perform such a method. The invention also relates to a modular brake regulator (1) having such a control device, and a modular drive unit (20) having a modular multilevel converter (21) and such a modular brake regulator (1).

The application relates to the technical field of power electronic converter control, and provides a three-port flyback DC-AC converter, characterized in that the three-port flyback DC-AC converter comprises a flyback circuit, a power frequency reverse bridge, an AC-DC converter and a CL filter which are sequentially connected in cascade; the AC-DC converter is an AC-DC three-winding flyback converter which can realize power factor correction function, and is realized through active device multiplexing and magnetic component multiplexing, and comprises a flyback transformer T 2, excitation inductance L f , output switch Q 3, Q 4; the modulation method is to calculate instantaneous output power P o , judge the operation mode of the system, and respectively perform active modulation, reactive modulation or mixed modulation, so that the power factor is adjusted through the modulation method.

The application discloses a kind of multi-transition resistance self-adapting fault current limiting methods under hybrid MMC topology, method includes: after direct current fault occurs, hybrid MMC first enters voltage open-loop current limiting state, after threshold time T observation Effect, real-time calculation |dI dc / dt|, it is compared with the preset absolute value threshold |dI dc / dt| th After distinguishing high resistance fault and low resistance fault;For low resistance fault, immediately switch to current closed-loop control to realize fast and powerful suppression;For high resistance fault, then extend voltage open-loop effect until current is close to target value and then switch, to make full use of its advantage in high resistance working condition can make current faster drop to target value, so as to obtain more optimal initial current limiting speed than directly cutting into current closed loop.The method of the application realizes adaptive optimization current limiting for different severity faults, and improves the robustness and reliability of hybrid MMC fault ride-through strategy in full working condition.

This application discloses a multilevel inverter circuit, an energy storage inverter, and a photovoltaic system, belonging to the field of power electronics technology. The multilevel inverter circuit includes: a first DC source and a second DC source connected in series; a first switching circuit, with its first terminal electrically connected to the connection node of the first and second DC sources, and its second terminal electrically connected to the positive terminal of the first DC source or the negative terminal of the second DC source; a full-bridge circuit, with its positive input terminal on the DC side connected to the positive terminal of the first DC source, and its negative input terminal on the DC side connected to the negative terminal of the second DC source; and a filter circuit electrically connected to the AC side of the full-bridge circuit, used to filter the AC output of the full-bridge circuit and provide a freewheeling path for the output current of the multilevel inverter circuit under specific switching states. While ensuring multilevel output capability, it reduces the number of required power switching devices, diodes, and other components, simplifies the main circuit topology, simplifies the control logic, and reduces the hardware cost of the inverter circuit.

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.

And electrostatic gun driver includes an inverter configured to receive power from a power supply. The electrostatic gun driver in addition includes a controller configured to control the inverter. The electrostatic gun driver moreover includes a filter configured to generate a sinewave drive signal and provide the sinewave drive signal to a material application system and / or a material application device.

With a coupled pair of inductors brought between front end and back end power switches, and with the DC voltage split using a pair of series connected capacitors and the midpoint being connected to the AC neutral, power conversion can be achieved with reduced ripple and / or total harmonic distortion. The two pairs of series connected back end switches are connected between AC neutral and a respective DC terminal with the midpoint between each pair of back end switches being connected to one of the coupled pair of inductors. A switch controller is operative to receive an input defining a direction of power conversion from AC to DC or DC to AC and a level of power conversion or a target output voltage of power conversion to generate gate signals for the power switches accordingly.

The application discloses the technical field of level modulation, and relates to a switching loss equalization control system and method based on level hybrid modulation, and a storage medium, which comprises the following modules: a signal processing module, which is used to acquire a three-level modulation voltage; a mode switching decision module, which is used to acquire the difference between the internal and external tube losses, and update a modulation mode flag bit by comparing a hysteresis threshold value; and a level hybrid modulation module, which is used to read the three-level modulation voltage and the modulation mode flag bit, and execute three-level modulation or equivalent two-level modulation to output a final modulation wave for controlling the state of a switching tube. The mode switching decision module of the application takes the three-level modulation voltage as the final modulation wave when three-level modulation is performed, and allocates the duty cycle of the intermediate level of the three-level modulation voltage to the high and low levels to obtain a two-level modulation voltage and acquire the final modulation wave when equivalent two-level modulation is performed, so that the dynamic equalization distribution of the internal and external tube losses is realized, and the thermal stability and reliability of the system are improved.

The application discloses a kind of T type three-level converter open-circuit fault diagnosis method with strong robustness, belong to the field of power electronic equipment fault diagnosis, to distinguish different switch similar open-circuit fault characteristics and accurately locate open-circuit fault tube.Considering different modulation strategies and modulation modes, the phase voltage residual is generated through the phase voltage model, so as to extract the fault characteristics of the converter under various open-circuit faults.Analyze the influence of factors such as parameter error, dead time and delay time of the system on the phase voltage vector residual, and the adaptive residual vector amplitude threshold based on uncertainty propagation theory.A hierarchical fault diagnosis scheme is proposed, which can locate the group-level open-circuit fault according to the voltage residual vector amplitude and angle, switch the three-level modulation mode of all phases of the converter to two-level mode, to further identify the specific fault switch from the fault group.A reasonable balance between robustness and speed can be achieved, and the complexity and adaptability of the diagnosis algorithm are fully considered.

The application belongs to the technical field of electronic power, and relates to a SWISS rectifier control method combining a capacitor energy storage outer ring and a zero-error prediction control, which comprises the following steps: a capacitor energy storage feedback is adopted in a voltage outer ring, a storage energy adjustment power is determined based on an error between a capacitor energy storage value and a target value, so that the outer ring directly senses energy state changes; a load feedforward compensation amount is determined based on load instantaneous power calculated from an output voltage and an inductor current, and is converted into a current inner ring instruction after being superimposed with the storage energy adjustment power, so that active energy compensation is realized; and a two-step zero-error prediction control is adopted in the current inner ring, a current prediction value is generated in the first step of prediction, a correction current is obtained by weighting fusion of an actual sampling value through a correction factor to suppress sampling errors, and an inductor voltage prediction value of the next period is calculated in the second step of prediction to compensate for two-beat delay of a digital control system. Through the control of energy outer ring adjustment, load feedforward compensation and zero-error inner ring tracking, the application can suppress voltage fluctuations when a load suddenly changes and improve dynamic response performance.

An object is to provide a noise filter that can achieve high reliability. A noise filter includes: a noise detection unit which detects a common mode noise flowing through an electric path; an amplification unit which, on the basis of the common mode noise detected by the noise detection unit, generates a cancellation signal for canceling out the common mode noise; an injection unit which injects the cancellation signal into the electric path; an abnormality detection unit which detects abnormality of the noise filter on the basis of output voltage or output current of the cancellation signal, and outputs an abnormality detection signal; and a protection circuit which inhibits an abnormal cancellation signal from being injected into the electric path, on the basis of the abnormality detection signal.

A motor driving device includes a direct current (DC) link capacitor configured to store DC power, and an inverter configured to convert the DC power stored in the DC link capacitor into AC power and supply the AC power to a motor. The motor driving device includes a shunt resistor configured to sense current flowing through the inverter and detect whether the current has reached threshold current for controlling a regenerative voltage during a braking operation. A control unit is configured to control an operation of the inverter and perform a regenerative operation when the braking operation is started. The control unit, during the regenerative operation, switches motive power of a drum connected to the motor into regenerative energy and transmit the regenerative energy to the DC link capacitor, by controlling active component current and reactive component current together in response to the reaching of the threshold current.