35 results about "Zero phase" patented technology

A power conversion device includes: a power converter including, for respective phases of AC, leg circuits each including a pair of arms connected in series, the arms including a plurality of converter cells which are connected in series and each of which has an energy storage element and a plurality of semiconductor elements, the leg circuits being connected in parallel between positive and negative DC terminals, the power converter being configured to perform power conversion between multiphase AC and DC; and a control unit. The control unit corrects an AC voltage command value for controlling AC voltage of the power converter, by a zero-phase-sequence voltage command value having a set amplitude and a set phase, and performs adjustment control for adjusting at least either the amplitude or the phase of the zero-phase-sequence voltage command value on the basis of electric energy variation in the arm.

The invention discloses a zero-phase-shift-angle dual three-phase permanent magnet synchronous motor control method, solves the problem that DTP-PMSM current reconstruction control needs a single current sensor to perforate more than three branches, and belongs to the field of motor driving. According to a sampling mode and a modulation mode of ISAMPLE of a sum of current between A and B two-phase lower bridge arms of a first set of three-phase windings of a motor and current between X and Y two-phase upper bridge arms of a second set of three-phase windings, and spatial distribution characteristics of the two sets of windings of the motor, a reconstruction region is constructed; constructing a motor six-phase current reconstruction expression of each reconstruction region; selecting a corresponding six-phase current reconstruction expression according to the reconstruction area where the reference voltage vector is located and the ISAMPLE collected in real time, and reconstructing the six-phase current; and controlling the motor according to the reconstructed six-phase current. Unification of current reconstruction, torque ripple suppression and dual three-phase resolver delay compensation can be realized.

The invention discloses a transformer type differential series resonant cavity, a differential series resonant oscillator, a chip and equipment, the resonant cavity comprises a two-port transformer and a variable capacitance module, the two-port transformer comprises an inductor LP1, an inductor LP2, an inductor LS1 and an inductor LS2 which are mutually coupled, and the variable capacitance module comprises a variable capacitor CP and a variable capacitor CS; one end of the inductor LP1 is connected with the first port, and the other end is connected with the variable capacitor CP; one end of the inductor LP2 is connected with the second port, and the other end is connected with the variable capacitor CP; one end of the inductor LS1 and one end of the inductor LS2 are connected with the third port and the fourth port respectively, and the other end of the inductor LS1 and the other end of the inductor LS2 are connected with each other; two ends of the variable capacitor CS are respectively connected with the third port and the fourth port; a plurality of pole frequencies of the voltage gain function AV are set to be equal such that AV at the zero phase increases. According to the invention, the problem that a series resonant oscillator cannot realize pure differential output in the current pure CMOS process is solved.

The invention discloses a zero-phase-shift-angle dual three-phase permanent magnet synchronous motor current reconstruction method, solves the problem that a dual three-phase permanent magnet synchronous motor current reconstruction control system needs a single current sensor to perforate a plurality of branches, and belongs to the field of motor driving. The method comprises the steps of combining carrier phase shift with AZSPWM based on a sampling mode of collecting the sum of currents of B, C, Y and Z lower bridge arms in a single path and spatial distribution characteristics of two sets of windings of a zero-phase-shift-angle dual three-phase motor, constructing reconstruction regions, constructing a six-phase current reconstruction expression of each reconstruction region, and giving a convenient and rapid sector switching reconstruction error suppression method; selecting a corresponding six-phase current reconstruction expression according to the reconstruction area where the reference voltage vector is located and the ISAMPLE collected in real time, and reconstructing the six-phase current; and controlling the motor according to the reconstructed six-phase current. According to the invention, current reconstruction is realized, and vibration noise generated by zero-phase-shift-angle DTP-PMSM even switches and sideband harmonic waves thereof can be eliminated at the same time.

The embodiment of the invention relates to a method and device for detecting a fault of a Hall sensor in a motor, a controller and a medium. The method comprises the following steps: acquiring an initial phase of a rotor of the motor sensed by a Hall sensor, wherein the initial phase is associated with the position of the rotor relative to a stator; determining whether the initial phase corresponds to a zero phase; and determining that the Hall sensor has a fault in response to the initial phase corresponding to the zero phase. According to the method disclosed by the invention, whether the Hall sensor in the motor has a fault or not can be judged only by detecting the phase of the rotor represented by the output signal of the Hall sensor under the condition that expensive and complicated inspection equipment is not used.

The invention discloses a dual-load automatic guided vehicle wireless charging system with an anti-offset characteristic, and belongs to the technical field of wireless power transmission. The system comprises a high-frequency full-bridge inverter, an LCC-S resonance compensation network, an orthogonal DD coil, a full-bridge rectifier and an external element. A transmitting coil and a receiving coil respectively adopt a winding method with dense outside and sparse inside and a winding method with sparse outside and dense inside, orthogonal magnetic field coupling is enhanced in combination with a ferrite magnetic core, and efficient cooperative power supply of a single power supply to double receiving loads and system stability are effectively guaranteed. The LCC-S network realizes bilateral resonance and zero phase angle input of the system through configuration of a plurality of independent capacitors and inductors, provides constant voltage output and inhibits multi-load crosstalk. Compared with the prior art, the problems of weak anti-offset capability, large multi-load interference, sudden efficiency drop and the like of a traditional scheme are effectively solved, and the coupling coefficient gt is within the offset range of + / -20cm; 0.25, the transmission efficiency is stable gt; double-AGV parallel charging is supported, and the voltage fluctuation is lt when a single load exits; and the system stability and the multi-machine cooperation capability are improved.

The invention relates to the technical field of power electronics and motor control, in particular to an accurate SVPWM (space vector pulse width modulation) dead zone compensation method based on oscilloscope phase marking, which comprises the following steps of: in frequency converter control software, setting a compensation angle to be 0, and inserting a zone bit of IO (input / output) conversion into a 0 phase of U-phase wave; operating the frequency converter, observing the position of the flag bit at the U-phase current through the oscilloscope, and obtaining a position angle, namely a compensation angle; the compensation angle is added to the software, and the obtained current compensation angle is the angle of the output voltage waveform + the angle of the output current + the compensation angle; and operating the frequency converter again, observing the position of the flag bit on the U-phase current through the oscilloscope, and judging whether the position is on the zero phase angle of the current or not. According to the method, the oscilloscope is utilized to visually find and determine the optimal compensation angle, so that accurate compensation of the SVPWM dead zone is realized.

A three-self-inertial-unit motor electric angle calibration method comprises the steps that an outer frame is rotated to the position close to a limiting block, a given motor 0-degree vector d-axis control quantity is controlled, and an outer frame motor is pulled to a motor 0-phase point; sequentially giving a 60-degree vector d-axis control quantity, a 120-degree vector d-axis control quantity and a 180-degree vector d-axis control quantity every two seconds; in the given process, the outer frame motor can continuously rotate in one direction, whether the angle of the motor is blocked or not is judged, and if yes, it is indicated that the outer frame moves to the limiting block; at the moment, a vector value is given reversely, 60 degrees are reduced every time by taking a phase value before giving as a reference, and when the phase angle is reduced to 0, a mechanical angle value of the outer frame is recorded; and storing the recorded mechanical angle value corresponding to the phase angle into an array, and calculating the phase zero angle of the outer frame motor. And similarly, calculating the phase zero angle of the inner frame motor to finish calibration. According to the motor phase zero angle measured by the method, compared with a single measurement value, the motor rotates more uniformly and smoothly.

The application provides a method for mismatch compensation of a multi-relay wireless power transmission system and related devices, and belongs to the technical field of wireless power transmission. If the constant voltage output frequency coincides with the hidden zero phase angle frequency, the output efficiency and output power of the multi-relay wireless power transmission system are determined based on the constant voltage output frequency and the hidden zero phase angle frequency. If the constant voltage output frequency does not coincide with the hidden zero phase angle frequency, the mismatch coefficient is determined again based on the hidden zero phase angle frequency at the constant voltage output frequency until the constant voltage output frequency coincides with the hidden zero phase angle frequency, and then the output efficiency and output power of the multi-relay wireless power transmission system are determined based on the constant voltage output frequency and the hidden zero phase angle frequency. The application solves the problems of additional energy loss and low transmission stability of the system.

The invention belongs to the technical field of power electronics, and discloses a wide-range zero-reactive LLC resonant converter based on a fractional order capacitor structure, which comprises a DC input voltage, an H-type inverter bridge consisting of Q1-Q4, a resonant inductor Lr, a resonant capacitor Cr and a resonant cavity structure consisting of an excitation inductor Lm, energy is transmitted to a secondary side through a transformation ratio N: 1 of a transformer, and the energy is transmitted to a secondary side through the resonant cavity structure. D1-D4 form a full-bridge rectifier which is connected with the secondary side of the transformer and is finally connected with a filter capacitor Cb and a load R, and the most important passive fractional order capacitor structure PFOC is connected in series into the resonant cavity structure. According to the invention, the inversion voltage in the passive fractional order circuit and the inversion voltage of the main circuit are controlled to be kept lagging by 90 degrees, so that the inversion voltage in the resonant cavity and the resonant cavity current realize a zero phase angle ZPA. When the ZPA is realized, the voltage gain of the LLC resonant converter is determined by the frequency, the frequency is inversely proportional to the voltage gain, and the voltage gain is less limited by the frequency.

This invention proposes a wireless charging system and parameter design method with zero-phase-angle constant current and constant voltage output characteristics. The wireless charging system specifically includes a DC voltage source U. DC Inverter bridge, primary-side compensation network, transmitting coil L p2 Receiver coil L' s1 Secondary-side compensation network, rectifier bridge, and load resistor R; the DC voltage source U DC The inverter bridge is connected to the primary-side compensation network and the transmitting coil L. p2 Connected, the transmitting coil L p2 With receiving coil L' s1 Mutual inductance, the receiving coil L' s1 The system is connected to a secondary compensation network and a rectifier bridge, with the rectifier bridge connected to the load resistor R. This invention achieves constant current / constant voltage operating mode switching only through two fixed operating frequencies under varying coupling coefficients, with both operating modes satisfying zero phase angle. Furthermore, the compensation topology suppresses higher harmonics in the rectifier unit, making the system's output current and voltage values ​​more stable.

The utility model relates to the technical field of transformers, in particular to a lead structure suitable for an oil-immersed transformer and the oil-immersed transformer applying the lead structure. The A-phase connecting bar, the B-phase connecting bar and the zero-phase busbar are assembled together by the lead structure through the first insulating structure; and the C-phase connecting bar is assembled with the A-phase extension section and the B-phase extension section through a second insulating structure, so that the A-phase connecting bar, the B-phase connecting bar, the C-phase connecting bar and the zero-phase busbar are connected and fixed into a whole. In addition, the flexible connecting pieces are installed on the A-phase connecting bar, the B-phase connecting bar and the C-phase connecting bar in a non-detachable mode, and a complete lead structure is formed. Therefore, when the lead structure is connected with the oil-immersed transformer, a flexible connecting piece does not need to be installed independently. That is, the flexible connecting piece is installed before testing, so that the testing result is close to the actual finished product data. In addition, the technical problem that independent installation is inconvenient due to the fact that the internal space of the connecting bar assembly is small in flexible connection is solved.

The invention belongs to the technical field of wireless power transmission, and particularly relates to a high-fault-tolerance constant-current constant-voltage output self-switching wireless power transmission system. The system comprises a high-frequency inverter, a first rectifier, a second rectifier, a first transmitting coil, a first compensation capacitor, a second transmitting coil, a second compensation capacitor, a parallel compensation capacitor, a first receiving coil, a second receiving coil, a first receiving compensation capacitor and a second receiving compensation capacitor. The system adopts a double-coupling LCC-S topology and resonance compensation parameters, a magnetic coupler of the system adopts a coil structure shaped like a Chinese character'tian 'and a square coil structure, and a transmitting end and a receiving end of the magnetic coupler are kept horizontal and are arranged in parallel; the system can realize switching of constant current or constant voltage output without any active control, has a zero phase angle characteristic during normal work, can realize fault tolerance under common fault conditions such as load open circuit or load short circuit, and also has the advantages of simple compensation parameter configuration, small size, light weight and the like.

The present application provides a phase zero-crossing detection method, a power switching method, a switching circuit, and a system. The method includes obtaining a sampled value of an electrical signal parameter of an alternating current (AC) upon detecting a timer interrupt; adjusting the timer interrupt frequency based on the sampled value and a standard zero-crossing reference value of the AC to match the frequency of the AC; and determining the phase zero-crossing of the AC upon detecting a timer interrupt based on the interrupt frequency. The present application detects the zero phase of the AC by adjusting the timer interrupt frequency, eliminating the need for zero-crossing detection using a hardware circuit. This reduces the difficulty and cost of related circuit design and improves the accuracy of detecting the phase zero-crossing of the AC.

The invention discloses a high-speed linear phase discriminator which comprises a channel transistor logic module 1, a channel transistor logic module 2, an AND gate AND1 and a reset path. The channel transistor logic module 1, the channel transistor logic module 2, the AND gate AND1 and the reset path are electrically connected. The channel transistor logic module is used for pre-charging, the logic complexity is reduced, the phase discriminator of the structure has higher maximum frequency, the zero phase difference dead zone of the phase discriminator is eliminated by feeding back and accelerating the circuit reset process when the same level is output, and the charge and discharge linearity of a follow-up charge pump is optimized by conducting pulse compensation.

Systems and techniques are described for producing haptic effects. For example, a computing device can apply, to an actuator of the computing device, a signal with a frequency. The computing device can monitor a measure of a phase difference associated with a power associated with the signal applied to the actuator. The computing device can determine, based on determining the measure of the phase difference is equal to zero, the frequency is a resonant frequency of the actuator. The computing device can produce, based on the actuator operating at the resonant frequency, the one or more haptic effects at the computing device.

The present invention can be applied to a motor driving device, and relates to a device for driving, for example, a direct current motor (DC motor), a method for controlling the motor, and a device (electronic device) driven by the motor. The invention may provide a method for controlling a motor, the method comprising the steps of: driving the motor according to a duty cycle command; detecting a change amount of a zero phase of a first phase current for driving the motor to obtain a first value; detecting the variable quantity of the maximum level of the first phase current to obtain a second value; and determining that the motor is in a control error state if at least one of the detected first and second values is greater than an error level.

The application discloses a reconfigurable gain T-type impedance network module and a control method thereof. The module comprises left and right series arms configured with the same type of passive resonant elements, and a middle parallel arm configured with passive resonant elements of a type opposite to that of the left and right series arms. Meanwhile, the gear switching states of the left series arm, the middle parallel arm and the right series arm are synchronously controlled by external unified switches at a designed working frequency, so that each gear satisfies a three-arm target impedance relationship, gain reconfiguration in different gears is realized, and approximate constant current output or constant voltage output is obtained at an output end. The input side presents a near-zero phase angle operation characteristic, so that AC power transmission efficiency is maximized and reactive power is minimized. The application has the characteristics of modularity, reconfigurability and simple operation, can realize multi-gear gain reconfiguration through passive elements at a fixed working frequency, and achieves the purposes of AC constant current and constant voltage, high-efficiency energy transmission and accurate power regulation.

The present application provides a detection device for residual current of a three-phase four-wire common zero line dual power supply, comprising: a dual power supply switching switch, a first residual current transformer, a second residual current transformer, a first current detection unit, a second current detection unit, and a residual current main control unit for sampling data and obtaining the residual current of the three-phase four-wire common zero line dual power supply according to the sampled data analysis. The three-phase four-wire common zero line dual power supply residual current detection device provided by the present application can accurately measure its residual current, and effectively avoid the inaccurate residual current or malfunction caused by the zero line current of the power cable disconnected from the load being not zero in the shared zero line dual power supply; the method provided by the present application is applicable to the detection device of the present application, and the accurate residual current of the common zero line dual power supply is obtained by detecting the residual current of the power supply electrically connected to the load and the vector sum of the phase current of the zero-phase cable of the power supply disconnected from the load.

The present invention relates to the technical field of EC-WPT, and specifically discloses an EC-WPT system based on frequency switching constant current / constant voltage output and a parameter design method thereof, which adopts an LC-CLC type resonant network, analyzes the characteristics of the LC-CLC resonant network, provides the conditions for realizing constant current / constant voltage output characteristics and the calculation method of constant current frequency and constant voltage frequency, and provides a system parameter design method. The EC-WPT system and parameter design method proposed in this article have the following advantages: no complex detection and control circuits are required, and the system can achieve constant current / constant voltage output when the load changes; no need to switch circuit topology, only switching the operating frequency is required to achieve switching between constant current and constant voltage working modes; no matter it is a constant current working mode or a constant voltage working mode, the system can achieve a ZPA (zero phase angle) state, reduce reactive power loss, and effectively improve system efficiency; the system has relatively few compensation elements, which can reduce system complexity.

The invention discloses a detection signal injection and parameter setting method and system, and belongs to the technical field of direct current power distribution network control and protection. The method comprises the following steps: selecting a detection signal frequency lower than a line model cut-off frequency; amplitude parameters are set, so that voltage fluctuation does not exceed 15%-20%; determining that the injection duration meets response delay, transition process and algorithm requirements; after a fault occurs, the IGBT is locked, and a phase shift angle is set to zero; superposing sine disturbance angles; the power function is modified to introduce dual frequency power disturbances. The system comprises a frequency selection module, an amplitude constraint module, a delay control module, a fault handling module and a signal injection module. According to the method, the detection signal is directly introduced into the modulation layer, so that the fault characteristics are enhanced, the reliability and sensitivity of the protection system are improved, and the method is suitable for the direct-current power distribution network with high-proportion new energy access.

An enhanced auto-zero circuitry and technique for reducing the effective input offset voltage of an amplifier. The circuitry includes a multi-phase auto-zeroing amplifier circuitry including several capacitor and switch components and a switch controller circuit. The switch controller circuit is configured to provide control signals for controlling the switches, where during a first sub-phase of an auto-zero phase, multiple switches are turned on to store an amplifier input offset coarser compensation charge on the input capacitor, and where during a second sub-phase of the auto-zero phase, at least one switch is turned off before turning on another switch to store an amplifier input offset finer compensation charge on the input capacitor via the first auto-zero capacitor.

The techniques and circuits described herein include solutions for auto-zero in auto-zero amplifiers in the presence of high frequency alternating current (AC) noise. In some aspects, a first input (114) and a second input (116) of an auto-zero amplifier (100) are coupled to a differential voltage having high AC noise. During an auto-zero phase, a first switching network (102) decouples an input (110, 112) of a first amplifier included within the auto-zero amplifier from the differential voltage with high AC noise. In some examples, the input of the first amplifier may be connected to a regulated direct current (DC) voltage (118). The regulated DC voltage provides more accurate auto-zeroing for the auto-zeroing amplifier, such that a higher overall accuracy is achieved during the operational phase.

This invention discloses an open-winding motor, its control method and apparatus, and a computer-readable storage medium. The method includes: acquiring the motor's current zero-phase setpoint current, zero-phase feedback current, feedback angular velocity, rotor position angle, q-axis voltage, d-axis voltage, and DC bus voltage; acquiring the historical zero-phase feedback current after N sampling times prior to the current cycle, where N is a positive integer; acquiring the motor's zero-phase setpoint voltage based on the zero-phase setpoint current, zero-phase feedback current, historical zero-phase feedback current, and feedback angular velocity; acquiring the duty cycles of the first and second inverters based on the zero-phase setpoint voltage, rotor position angle, q-axis voltage, d-axis voltage, and DC bus voltage; and controlling the motor based on the duty cycles. Therefore, this method only requires storing the historical zero-phase feedback current from one cycle ago, eliminating the need for complex and heavy-load data calculations, and can be implemented using a low-cost microcomputer.

This invention discloses a fractional phase-locked loop (PLL) based on multi-path quantization noise compensation. It introduces a data synchronization circuit based on the falling edge of the reference clock, ensuring that the divider signals of all paths have reached steady state before the phase detector is triggered by the next rising edge of the PFD, thus completely eliminating dynamic timing interference in the mixed-signal path. By introducing a multi-path retimer with a sign bit, the compensable quantization noise range is expanded. The current-DAC type charge pump proposed in this invention adopts a charge pump architecture based on a source switch array and a static discharge current. The source switch array utilizes the low impedance characteristics of the source nodes of the current source transistors, significantly improving the switching speed and reducing the settling time. The static discharge current forces the loop to maintain a fixed non-zero phase offset in the locked state, permanently shifting the charge pump operating point out of the nonlinear region and deeply suppressing fractional spurious emissions.

The present invention discloses a composite protection low-voltage circuit breaker, comprising a trip unit, a zero-sequence induction coil, and a composite protection circuit. The composite protection circuit is connected to the phase output and the zero-phase input of the low-voltage circuit breaker. The composite protection circuit requires only a high-voltage trigger diode and a resistor to implement overvoltage protection. The high-voltage trigger diode, a mature, highly reliable passive component, significantly improves reliability compared to overvoltage protection devices that utilize extensive active detection circuitry. The present invention achieves islanding protection at a very low cost and solves the problem of false tripping of leakage circuit breakers.

Systems and methods reduce a locking time of a type-II all-digital phase-locked loop (ADPLL) circuit by performing steps that comprise receiving a reference signal having a reference frequency and setting a digitally controlled oscillator (DCO) to a target frequency greater than the reference frequency. The DCO generates an output signal that is used to generate a feedback signal. A time-to-digital converter is used to determine an initial phase difference between the reference signal and the feedback signal, and a digital initial phase compensation circuit adjusts the initial phase difference to a substantially zero phase difference to reduce the locking time of the ADPLL circuit such that the ADPLL circuit reaches a steady-state condition in ten or fewer cycles of the reference signal.

This invention proposes a wireless charging system suitable for zero-phase-angle constant current and constant voltage and its parameter design method, including a DC voltage source U. in Inverter unit, primary-side compensation network, transmitting coil L p2 Receiver coil L s The DC power supply U consists of a secondary compensation network, a rectifier unit, and a load resistor R. in Connect the inverter unit, which is connected to the primary-side compensation network and the transmitting coil L. p2 The transmitting coil L p2 With receiving coil L s Mutual inductance, the receiving coil L s The secondary compensation network is connected to the rectifier unit, which is connected to the load resistor R. This invention does not require the introduction of switches or complex control circuits, eliminating power losses and heat dissipation problems associated with switching switches and control circuits. By constructing the topology and setting the parameter relationships, it achieves constant current / constant voltage working mode switching only through two fixed operating frequencies under varying coupling coefficients. Both working modes satisfy zero phase angle, resulting in high system transmission efficiency.

The application provides a parity-time symmetry wireless power transmission system frequency hopping judgment and suppression method based on a description function method, adopts the description function method and combines a step response of the parity-time symmetry wireless power transmission system to determine an actual self-oscillation point; for a system of zero phase angle control, whether frequency hopping occurs is judged by analyzing self-oscillation point frequencies of different detunings, and the frequency hopping is suppressed by changing a compensation topology and / or limiting a detuning variation range; for a system of phase shift control, whether frequency hopping occurs is judged by analyzing a self-intersection position of a transfer function, and the frequency hopping is suppressed by limiting an output voltage duty cycle of an inverter.