51 results about "Two-phase electric power" patented technology

A method for motor voltage reconstruction by Analog to Digital Converter (ADC) oversampling and averaging includes measuring a first phase voltage with an ADC, the first phase voltage proportional to a first duty cycle of a first Pulse Width Modulation (PWM) signal. A second phase voltage is measured with the ADC, the second phase voltage proportional to a second duty cycle of a second PWM signal, wherein the first PWM signal and the second PWM signal control consecutive phases of a three-phase motor. A third duty cycle of a third PWM signal of the three-phase motor is reconstructing from the first phase voltage and the second phase voltage.

The invention relates to a relay phase selection pull-in control method. The method comprises the following steps: acquiring a first phase voltage zero crossing point, a second phase voltage zero crossing point and a third phase voltage zero crossing point; speculating pull-in voltage zero crossing points of the first soft start relay and the second soft start relay based on the third phase voltage zero crossing point, and speculating pull-in time delay of the first soft start relay and the second soft start relay based on the pull-in voltage zero crossing points; speculating a first pre-charging zero crossing point based on the first phase voltage zero crossing point, and speculating the pull-in time delay of the first main power relay based on the first pre-charging zero crossing point; and a second pre-charge zero crossing point is speculated based on the second phase voltage zero crossing point, and the pull-in time delay of the second main power relay is speculated based on the second pre-charge zero crossing point. Inrush current can be suppressed, loss is reduced, and the service life of the relay is prolonged.

An apparatus includes a second phase PWM off time current sense circuit configured to generate a second phase PWM off time current signal proportional to a current flowing through a second inductor when a high-side switch of the second phase is turned off and a low-side switch of the second phase is turned on, a second phase PWM on time current rebuild circuit configured to construct an artificial second phase inductor current signal using a second phase voltage-controlled current source to charge a second rebuild capacitor when the high-side switch of the second phase is turned on, and a second phase feedback loop configured to adjust a current flowing through the second phase voltage-controlled current source so as to force a saved voltage of the artificial second phase inductor current signal to be equal to a saved voltage of the second phase PWM off time current signal.

The invention relates to the technical field of motor control in the intelligent power grid industry, and discloses a space vector control method for a twelve-phase permanent magnet synchronous motor flywheel energy storage system, a control circuit of the flywheel energy storage system relates to power electronic components such as various semiconductor field-effect tubes, and the space vector control method is used for high-precision control of a motor. Comprising the steps of S1, twelve-phase space vector decoupling fault-tolerant control, S2, high-order harmonic energy recovery closed loop, S3, quantum annealing parameter optimization layer, S4, flux linkage adaptive observer network construction and S5, 18-dimensional switching vector table construction. According to the scheme, through multi-reference coordinate system transformation and a redundant phase reconstruction algorithm, rapid fault-tolerant response of the twelve-phase motor during a single-phase or two-phase fault is realized, a current path is dynamically recombined during the fault, a negative-sequence current compensation ring is combined, torque ripple is effectively suppressed, and the reliability of the motor is improved under a high-speed charging and discharging working condition. The harmonic distortion rate is detected in real time through the sliding window FFT, the bandwidth of the controller is adjusted, and the problem that the dynamic response of a traditional fault-tolerant strategy is insufficient is solved.

A washing machine is provided that accurately detects a wire break in a motor that rotates a drum and reduces the time required for wire break detection. The washing machine includes: a three-phase brushless DC motor that rotates the drum and drives a pulsator via a reduction gear; an inverter circuit that drives the motor using PWM control; a current detection unit that individually detects the three-phase current of the motor; a control unit that vector controls the motor via the inverter circuit; a wire break detection unit; and an abnormality processing unit. When the wire break detection unit detects a wire break, the unit stops the motor and issues an abnormality report. The wire break detection unit performs a smoothing process on the current value detected by the current detection unit while the motor is rotating the pulsator via the reduction gear. A wire break is detected when the difference between the current value of one phase and at least one of the other two phases remains below a predetermined value for a predetermined period of time.

The invention discloses a CRM totem pole three-phase interlaced PFC control method, which comprises a signal sampling circuit, a filter circuit, a control circuit, an auxiliary winding circuit and a main power loop circuit, adopts a voltage mode control strategy, does not need a current inner loop, and simplifies a control system. The signal sampling circuit comprises an input voltage sampling circuit, an output voltage sampling circuit, an auxiliary winding voltage sampling circuit and an inductive current sampling circuit. The main power loop circuit comprises a first phase circuit, a second phase circuit and a third phase circuit which are mutually staggered and connected in parallel. The auxiliary winding circuit is used for controlling the turn-on time of the active tube, and the inductive current sampling circuit is used for controlling the turn-off time of the follow current tube, so that soft turn-on of the active tube in a full input voltage range is realized. The method can be expanded to an N-phase interleaving PFC system, and high-frequency current ripples are reduced through phase shift control. The method is suitable for occasions with high requirements on power supply performance, such as server power supplies and electric automobiles.

A method for operating a motor drive to supply power to an electric motor comprises: measuring a first phase current and a second phase current in the electric motor; calculating, based on the first phase current and the second phase current, an estimated third phase current in the electric motor; determining an estimated motor current using a current observer and based on the first phase current, the second phase current, and the estimated third phase current; determining, based on the estimated motor current, a voltage command; and commanding, based on the voltage command, an inverter to supply an alternating current (AC) power to the electric motor.

This invention belongs to the field of power electronics and electric vehicle charging technology, and discloses a bidirectional electric vehicle charger topology, control method, and system, including a grid-side module, an AC-DC module, and a DC-DC converter. The grid-side module includes a three-phase power supply from the grid, a first-phase resistor Rga, a second-phase resistor Rgb, and a third-phase resistor Rgc. The AC-DC module includes a power switching transistor group, a first capacitor C1, and a second capacitor C2. The three-phase output terminals of the grid power supply are respectively connected to the first-phase inductor Lga, the second-phase inductor Lgb, and the third-phase inductor Lgc. This invention eliminates the need for additional filtering hardware, reducing manufacturing costs, physical size, and system complexity, while improving power density and reliability. It can accurately locate and specifically compensate for critical harmonics of specific orders in the power grid, and can quickly and in real-time track and suppress dynamically changing harmonics and transient disturbances.

The application discloses a five-seventh harmonic suppression method suitable for a twelve-phase motor, four sets of three-phase currents of a twelve-phase propulsion system are collected to obtain twelve alternating currents; two sets of three-phase windings of the twelve-phase motor with a phase difference of 30 degrees are taken as a whole, five-seventh harmonic amounts of the two sets of three-phase currents with a difference of 30 degrees are converted into direct currents by using a six-phase park conversion matrix; the output amounts of the direct currents obtained by a PI regulator are combined with the direct currents on a fundamental wave plane, and the alternating currents calculated by using a six-phase park inverse conversion matrix are taken as corresponding modulation waves of each channel respectively. The application is simple and easy to implement, has strong universality, has good five-seventh harmonic suppression effect, and is easy to be popularized to other multi-phase motor system harmonic suppression occasions.

The invention discloses a phase following device for a GIS (Gas Insulated Switchgear) same-frequency and same-phase test, which comprises a first closed-loop phase-locked loop, a second closed-loop phase-locked loop and a third closed-loop phase-locked loop which are respectively connected with a first phase voltage, a second phase voltage and a third phase voltage of an operation side of a transformer substation so as to provide a phase and a frequency of a target voltage, the fourth closed-loop phase-locked loop is connected with the test side so as to synchronize the phase and frequency of the target voltage of the operation side of the transformer substation with the phase of the test-side voltage; the PI controller is connected with the first closed-loop phase-locked loop, the second closed-loop phase-locked loop, the third closed-loop phase-locked loop and the fourth closed-loop phase-locked loop so as to dynamically compensate the phase difference between the voltage of the operation side and the voltage of the test side of the transformer substation, and the phase out-of-control alarm structure is connected with the PI controller. And when the sum of the phases at the test side is not 0 and the phase difference between the voltage at the test side and the voltage at the operation side is greater than a preset threshold value, alarming and prompting.

A method for detecting the interruption of the connection of the neutral line (6) of a three-phase electric power network, the method being implemented in a processing unit (7A) of an item of electrical equipment (7) connected to the electric power network (1) and comprising the following steps: - acquisition, at a time T, of a first phase voltage (V1), a second phase voltage (V2) and a third phase voltage (V3) measured by a voltage sensor (7D) of the electrical equipment (7); evaluation of a first quantity representative of the ratio of the maximum voltage to the minimum voltage from the first, second and third phase voltages; - if the first quantity is greater than a predetermined threshold: o evaluation of a second quantity based on the first phase voltage, the second phase voltage and the third phase voltage; o detection of the interruption of the neutral line (6) at the time T when the second quantity satisfies a predetermined reference criterion.

The utility model discloses a vehicle-mounted integrated transformer device and an automobile. The vehicle-mounted integrated transformer device comprises a base; the magnetic core comprises a first magnetic column, a second magnetic column and a third magnetic column, the first magnetic column and the second magnetic column are symmetrically arranged relative to the third magnetic column, the first magnetic column is provided with a first primary winding, the second magnetic column is provided with a second primary winding, the first primary winding is used for generating a first phase voltage, and the second primary winding is used for generating a second phase voltage; the first phase voltage and the second phase voltage are generated alternately, an output inductor is arranged on the third magnetic column and used for filtering the first phase voltage and the second phase voltage, and the third magnetic column is used for generating resonant inductance after amplifying magnetic leakage. And the transformer winding, the output inductor and the resonant inductor are effectively combined together, so that the overall occupied volume of the transformer and other devices is reduced, the production cost is reduced, and the transformer can be widely applied to the technical field of transformers.

The invention relates to the technical field of power electronic power conversion, and provides a split-phase inverter circuit, which is used for converting direct current into two-phase power for a load to use, and comprises a boost balancing unit, a first direct current voltage dividing unit, a second direct current voltage dividing unit, a switch unit and a filtering unit, the DC power supply is connected with a first end and a second end of an input side of the boost equalization unit. A first end and a third end of an output side of the boost equalization unit are respectively connected with a first end of the first DC voltage dividing unit and a second end of the second DC voltage dividing unit. The second end of the first DC voltage dividing unit is connected with the first end of the second DC voltage dividing unit, and the connection point is connected with the second end of the output side of the boost equalization unit and the second end of the input side of the filtering unit. The first end of the input side of the switch unit is connected with the first end of the first direct-current voltage dividing unit, and the second end of the input side is connected with the second end of the second direct-current voltage dividing unit; the first and second ends of the output side of the switch unit are respectively connected with the first and third ends of the input side of the filtering unit; the first end, the second end and the third end of the output side of the filtering unit are respectively connected with a load through a first phase line, a neutral line and a second phase line; the circuit can improve the DC voltage utilization rate and solve the problem of non-uniform voltage.

A phase power supply path switching circuit comprises a three-phase input end, a three-phase output end, a matrix switch unit, a detection unit and a control unit. The matrix switch unit includes a plurality of bidirectional switches coupled between the three-phase input terminal and the three-phase output terminal. The detection unit is coupled to and detects voltages of the first phase line, the second phase line and the third phase line. The control unit is coupled to the detection unit and the matrix switch unit to control the two-way switches to switch the first phase power path and the second phase power path in response to detecting that a first line voltage between the first phase line and the second phase line is a zero point and a second line voltage between the second phase line and the third phase line is in a polarity half cycle.

The invention provides a cable for an electric brake, which can restrain the situation that current cannot be supplied to an electric brake device. An electric brake cable (3) supplies a three-phase alternating current to an electric motor (201) of an electric brake device (2) using the electric motor (201) as a power source. A cable (3) for an electric brake is provided with: a first electric wire group (31) provided with a first U-phase electric wire (311), a first V-phase electric wire (312), and a first W-phase electric wire (313); a second electric wire group (32) provided with a second U-phase electric wire (321), a second V-phase electric wire (322), and a second W-phase electric wire (323); a tape member (33) wound around the outer periphery of a twisted body (30) in which the first electric wire group (31) and the second electric wire group (32) are twisted; and a sheath (34) that covers the outer periphery of the belt member (34). The first wire group (31) and the second wire group (32) are each redundantly connected to the electric motor (201).

The present disclosure provides a double-resistance motor control circuit and a motor control system. The double-resistance motor control circuit comprises a main controller, a first phase current sampling circuit, a second phase current sampling circuit and a third phase current sampling circuit, the first phase current sampling circuit, the second phase current sampling circuit and the third phase current sampling circuit each comprise N power conversion units, each power conversion unit is electrically connected with the same phase winding of a different motor, a first sampling resistor is arranged in the first phase current sampling circuit to collect the first phase current of N motors, a second sampling resistor is arranged in the second phase current sampling circuit to collect the second phase current of N motors, the main controller is used to obtain the corresponding third phase current based on the first phase current and the second phase current of each motor, and control the operating state of each motor based on the first phase current, the second phase current and the third phase current; wherein N is a positive integer greater than 1. The double-resistance sampling of the present disclosure can reduce the cost.

The application provides a switched capacitor circuit and a control method thereof. The switched capacitor circuit comprises an input terminal, an output terminal, a first phase circuit, a second phase circuit, and a charge pump formed by an inter-phase coupling circuit. The first phase circuit and the second phase circuit each comprise two-stage flying capacitors and a plurality of switching tubes, which are respectively connected to the input terminal, the output terminal, and a reference ground through the switching tubes. The inter-phase coupling circuit comprises two cross switching tubes, which cross-connect the plate of the first-stage flying capacitor of one phase and the plate of the second-stage flying capacitor of another phase. By controlling the conduction state of each switching tube, at least two different voltage conversion ratios are output. The embodiment of the application realizes the voltage conversion output of multiple ratios by the cross-coupled two-phase two-stage charge pump structure with a small number of switching tubes, reduces the voltage stress of the flying capacitor, simplifies the control logic, and reduces the cost of the charging scheme.

The present application belongs to the technical field of lithium electronic battery, and particularly relates to a three-phase balanced heating plate. The three-phase balanced heating plate comprises a substrate and an electric heating element, the electric heating element comprises first, second and third heating elements with the same power and spaced from each other; at least two of the first, second and third heating elements are attached to the side of the thickness direction of the substrate; the first heating element leads out a first A-phase electrode and a first B-phase electrode, the third heating element leads out a second A-phase electrode and a first C-phase electrode, the second heating element leads out a second B-phase electrode and a second C-phase electrode, the second B-phase electrode is electrically connected with the first B-phase electrode, and the second C-phase electrode is electrically connected with the first C-phase electrode; the first A-phase electrode and the second A-phase electrode are electrically connected with the A-phase of a three-phase power supply, the first B-phase electrode is electrically connected with the B-phase of the three-phase power supply, and the first C-phase electrode is electrically connected with the C-phase of the three-phase power supply. The device can realize three-phase balance without being a multiple of three.

The invention relates to shunt-free motor control for a multi-phase motor. Techniques and circuits are described herein for controlling and measuring current through a multi-phase motor without the use of shunt resistors. A method may include controlling a power switch of an inverter circuit to deliver a first phase current, a second phase current, and a third phase current to a multi-phase motor; and determining at least one of a first phase current, a second phase current, and a third phase current based on a first voltage drop over one of the power switches in the on mode and based on the temperature measurement, wherein the temperature measurement is based on a second voltage drop over the body diode of one of the power switches in the non-conducting mode during the dead time.

Techniques and circuits for controlling a multi-phase electric motor and measuring current through the multi-phase electric motor without using a shunt resistor are described herein. A method may comprise controlling power switches of an inverter circuit to deliver a first phase current, a second phase current, and a third phase current to a multi-phase electric motor, and determining at least one of the first phase current, the second phase current, and the third phase current based on a first voltage drop over one of the power switches in a conducting mode and based on a temperature measurement, wherein the temperature measurement is based on a second voltage drop over a body diode of one of the power switches in a nonconducting mode during a dead time.

The present invention discloses an inductance-edited 12-slot semi-twelve-phase fault-tolerant motor and a fault-tolerant method. The motor is divided into a fault-tolerant section one, an armature section and a fault-tolerant section two along the axial direction. The armature section is a semi-twelve-phase stator-rotor motor unit, and the fault-tolerant section is a three-phase stator motor unit. All motor units share a rotating shaft, and a set of windings are wound on the stators of the armature section and the fault-tolerant section at the same time. The ABC phase windings are wound in series on the armature section and the fault-tolerant section one, and the UVW phase windings are wound in series on the armature section and the fault-tolerant section two. The fault-tolerant method includes: when a short-circuit fault occurs in a phase winding coil, the electrical connection between the faulty phase winding coil and the controller is disconnected, and the current operating point of the healthy phase is reconstructed to achieve the smooth output of torque while suppressing the short-circuit current. The present invention solves the problem of the existing lack of fault-tolerant technology for semi-twelve-phase motors that takes into account both suppressing short-circuit current and improving the output quality of motor torque.

A method according to the invention for determining admittance components (YΣ, YΔa, YΔb) of a three-phase three-phase motor (2) comprises the following steps: a) Generating a first phase current (iU), a second phase current (iV) and a third phase current (iW) which flow through phase windings of the three-phase motor (2), wherein the phase currents (iU, iV, iW) are generated by an inverter (4) to which a motor voltage (uM) is supplied as a control signal, and wherein the motor voltage (uM) is generated by superimposing a fundamental frequency voltage (uf) generated by a current controller (7) and a carrier voltage (uc) generated by a carrier voltage generator (8);b) Acquiring a number (n) of measurement sets with one sampling period (TPWM), wherein each of the measurement sets comprises the first phase current (iU) as the first measurement, the second phase current (iV) as the second measurement, and the third phase current (iW) as the third measurement, and wherein the measurement values ​​of each measurement set are acquired time-synchronously; c) Combining the measurement values ​​of the acquired number (n) of measurement sets to form an input vector (E); d) Multiplying the input vector (E) by a matrix (M) to form an output vector (A); e) Determining an isotropic admittance component (YΣ), a first anisotropic admittance component (YΔa), and a second anisotropic admittance component (YΔb) from the output vector (A).

Various techniques and embodiments are presented to operate a two-phase machine. A two-phase machine is powered by a first phase circuit including a first string of battery cell devices electrically coupled to the machine via a first supply line and a first return line and a second phase circuit including a second string of battery cell devices electrically coupled to the machine via a second supply line and a second return line. The one or more processors may be configured to control operation of one or more switches in the first string of battery cell devices and the second string of battery cell devices such that a first voltage provided by the first string of battery cell devices is 90 DEG out of phase relative to a second voltage provided by the second string of battery cell devices. The two-phase machine may be a motor including a stator having a two-phase winding pattern.

The embodiment of the invention relates to a method and equipment for motor detection, a medium and a chip. The method comprises the following steps: switching off switching tubes of a first phase, a second phase and a third phase and switching on power supply voltage of a driving loop; detecting a first phase voltage, a second phase voltage and a third phase voltage; based on the detected first phase voltage, the second phase voltage and the third phase voltage, whether the motor is short-circuited to the ground or not is determined; switching on switch tubes of a first phase, a second phase and a third phase in response to the fact that the motor has no short circuit to ground; and based on the detected first phase voltage, the second phase voltage and the third phase voltage, determining whether the motor is open-phase or not.

The invention discloses a pre-charging loop DC bus current reconstruction method, a storage medium and a system. The method comprises the following steps: respectively obtaining a first phase current and a second phase current of an AC side in a three-phase uncontrolled rectifier bridge; determining a third phase current according to the first phase current, the second phase current and a three-phase balance principle; and based on the reverse blocking property of the diode, reconstructing the direct current bus current according to the first phase current, the second phase current and the third phase current. Two-phase alternating current signals are detected, the three-phase balance principle is combined, the direction relation and the numerical relation of the three-phase current are derived, the mapping relation between the direct current and the three-phase current is reconstructed by means of the direction relation between the three-phase alternating current and the reverse blocking performance of the diodes, and the three-phase current is obtained. The problems that the relation between the alternating-current side current and the direct-current side current is complex due to the nonlinear characteristic of the three-phase uncontrolled rectifier bridge, and accurate reconstruction is difficult through conversion are solved.

The invention provides a three-phase current sampling crosstalk correction system and method of a single motor, the three-phase current sampling crosstalk correction system comprises a motor three-phase circuit and a single-chip microcomputer, the first phase of the motor three-phase circuit outputs a first phase current Iua to the single-chip microcomputer; the second phase outputs a second phase current Iva to the single-chip microcomputer; the third phase outputs a third phase current Iwa to the single-chip microcomputer; a compensation module is arranged in the single-chip microcomputer, a crosstalk compensation matrix is preset in the compensation module, the first phase current Iua, the second phase current Iva and the third phase current Iwa are constructed into a phase current matrix, the product of the phase current matrix and the crosstalk compensation matrix is calculated, and a real current matrix is obtained; and extracting a first real phase current Iub, a second real phase current Ivb and a third real phase current Iwb in the real current matrix and outputting the first real phase current Iub, the second real phase current Ivb and the third real phase current Iwb. After the technical scheme is adopted, the crosstalk compensation matrix is added into the algorithm, so that the interference of the two-phase sinusoidal current of the magnetic-core-free current sensor in the single motor on the sampling of the other-phase current can be corrected.

Techniques and circuits for controlling a multi-phase electric motor and measuring current through the multi-phase electric motor without using a shunt resistor are described herein. A method may comprise controlling power switches of an inverter circuit to deliver a first phase current, a second phase current, and a third phase current to a multi-phase electric motor, and determining at least one of the first phase current, the second phase current, and the third phase current based on a first voltage drop over one of the power switches in a conducting mode and based on a temperature measurement, wherein the temperature measurement is based on a second voltage drop over a body diode of one of the power switches in a nonconducting mode during a dead time.

The invention discloses an energy storage power supply and a household load standby power system. A controller of the energy storage power supply is configured to: monitor a mains voltage of a single-phase mains terminal; when it is monitored that the voltage of the mains supply is normal, the change-over switch circuit is controlled, so that a first-phase line between the single-phase mains supply end and the split-phase output end is conducted, and first-phase power from the mains supply is provided for the split-phase output interface; the control circuit is used for controlling the change-over switch circuit to conduct a second phase line between the energy storage alternating current end and the split-phase output end, and controlling the direct current and alternating current bidirectional converter to invert the direct current of the battery module into the alternating current so as to provide second phase power for the split-phase output interface; wherein the phase difference A between the second phase electricity and the first phase electricity is larger than or equal to 178 degrees and smaller than or equal to 182 degrees. According to the energy storage power supply, when the single-phase mains supply is used for charging the energy storage power supply, the energy storage power supply can synchronously start split-phase output, so that the use function of the portable energy storage power supply in a specific scene of household emergency standby power is expanded.

Described herein are techniques and circuits for controlling a multi-phase electric motor and measuring the current through the multi-phase electric motor without using a shunt resistor. A method may include controlling power switches of an inverter circuit to supply a first phase current, a second phase current, and a third phase current to a multi-phase electric motor and determining at least one of the first phase current, the second phase current, and the third phase current based on a first voltage drop across one of the power switches in a conducting mode and based on a temperature measurement, wherein the temperature measurement is based on a second voltage drop across a body diode of one of the power switches in a non-conducting mode during a dead time.

The utility model provides a multifunctional power supply conversion device, which is provided with a box body, the box body comprises a control panel, a three-phase power supply input socket and a direct current transformer, the control panel is fixed on the upper surface of the box body, the three-phase power supply input socket is arranged on the outer side surface of the box body, and the direct current transformer is arranged in the box body. A two-phase power supply output interface, a three-phase power supply output interface, a direct-current power supply output interface and a two-phase power supply input socket are fixed above the control panel; wherein the two-phase power supply output interface is electrically connected with the three-phase power supply input socket and the two-phase power supply input socket respectively, the three-phase power supply output interface is electrically connected with the three-phase power supply input socket and the two-phase power supply input socket respectively, and the direct-current transformer is electrically connected with the three-phase power supply input socket and the two-phase power supply input socket respectively. Therefore, conversion between different power supply voltages is realized, power can be supplied to the fault load independently, and the limitation of the field on the power supply demand of the motor train unit is reduced.