52results about How to "Phase coincidence" patented technology

The liquid crystal panel (2) has a scanning signal line (31) for supplying a scanning signal to a gate (20) of a TFT (14), and a data signal line (32) for supplying a data signal to a data electrode (24) of the TFT. The liquid crystal panel is also provided with electrode pads (27a) for auxiliary capacitors and auxiliary capacitor wirings (33) forming auxiliary capacitors so as not to introduce capacitive coupling with scanning signal lines. Furthermore, the liquid crystal panel is driven at a screen rewriting frequency of 30 Hz or less. As a result, the liquid crystal panel can be driven with low power consumption while still maintaining good quality.

Alternately arrange 2m stator rings in the axial direction, where m is a natural number greater than or equal to 2 (m=2 in the embodiment), each stator ring is formed with a plurality of teeth (31b-34b) and connects the teeth to each other 2m-1 slots (41, 42, 43) are formed between 2m stator rings, and the windings (36, 37, 38) in each slot (41, 42, 43) will be accommodated in the return path The windings (36, 37, 38) in the slots (41, 42, 43) at a distance of m are connected in series so that the excitation directions are opposite, so that the phases of the magnetic flux passing through the teeth (31b-34b) of each stator ring are respectively staggered by 360 ° / 2m, it is possible to abolish the winding portion (transition portion) that does not contribute to the torque, and since the magnetic circuit of each phase is shared through the return path (31a to 34a), a thin and high-output salient pole motor can be obtained, and Since the magnetic circuit of the wave winding motor is formed, the output torque can be increased compared with the salient pole concentrated winding motor.

The invention discloses an AC constant current source system, comprising: an AC / DC rectification module, a DC / AC inverter module, an energy conversion module, a current detection module, a voltage detection module, and a digital control module. The digital control module is based on the AC / DC The port voltage of the rectifier module, the port voltage and output current of the transducer module control the DC / AC inverter module, and the high-voltage and low-current power output by the DC / AC inverter module is converted into a low-voltage and high-current power supply by the transducer module. The module outputs AC constant current. The invention adjusts the output current of the transducer module through the error control method, keeps the output AC current consistent with the target current amplitude, frequency and phase, and the system has a short operating cycle, precise control, strong real-time performance, good reliability and high efficiency, and the AC constant The current source is multi-level adjustable, suitable for various occasions such as low-voltage electrical appliance testing and other AC constant current source power supply.

The invention provides an electrified railway cophase power supply scheme based on uncontrolled rectification and step wave synthesis inversion, and belongs to electrified railway cophase power supply schemes. [System]: An input end of a phase-shifting transformer is electrically connected with a three-phase high-voltage alternating current, an output end of the phase-shifting transformer is connected with a three-phase uncontrolled rectifier, and the three-phase uncontrolled rectifier is connected with a single-phase inverter through a filtering capacitor; a DC accumulator is connected between the filtering capacitor and the single-phase inverter, and the DC accumulator provides interfaces for accessing other energies; and output ends of the single-phase inverter are respectively connected with an uplink overhead line system and a downlink overhead line system. [Method]: An inversion side performs step wave synthesis modulation, and phase information of all traction substation is provided by a GPS synchronous clock; the uplink and downlink overhead line systems are in a parallel operation state; and a proper number of energy storage batteries are disposed in a DC filtering link, residual regenerated energy when a small probability event that brake power is greater than traction power occurs is cached, and interfaces for introducing the other energies are provided. [Advantages]: the scheme has the advantage of mutual standby, and capacity investment is saved.

A bidirectional homologous coherent microwave optical fiber phase-stabilized transmission method, the bidirectional homologous coherent microwave optical fiber phase-stabilized transmission system using the method includes a front-end device and a back-end device; the front-end device and the back-end device are connected by a dual-core optical fiber , to transmit uplink and downlink optical signals respectively; a phase-stable reference reference source is set in the front-end equipment, and the phase-stable reference reference source generates a phase-stable reference reference electrical signal, and the phase-stable reference reference electrical signal is modulated into a phase-stable reference reference optical signal, which is passed through the front-end The dual-core optical fiber between the equipment and the back-end equipment is transmitted to the back-end equipment, and then returns through the original path of the dual-core optical fiber to become the uplink and downlink phase-shifted information optical signals; the uplink and downlink phase-shifted information optical signals are demodulated into uplink and downlink The phase difference generated by the phase comparison between the phase-shifting information electrical signal and the phase-stable reference electrical signal is converted into an uplink and downlink phase-shifting control signal, and the phase-stabilization control is performed on the uplink and downlink optical signals transmitted in the dual-core optical fiber, thereby realizing bidirectional synchronization. Phase-stable transmission of source coherent microwave fibers.

In order to solve the problem of low reliability of parallel operation of generator sets in the prior art, the present invention provides a phase synchronization method for parallel operation of multiple generator sets. The generator set includes an engine generator, a rectifier unit, an inverter unit and an output filter. It also includes a main control unit and a throttle control unit; it also includes a current sampling unit, a voltage sampling unit and a voltage zero-crossing unit, and the output ends of the output filtering unit are respectively connected with the current sampling unit, the voltage sampling unit and the voltage zero-crossing unit. In this application, the actual output current of the generator set, the value of the output voltage, and the time difference between the actual zero-crossing point of the output voltage and the software zero-crossing point are collected, and compared with the preset value in the main control unit of the generator set, the period of the output voltage is adjusted. The value and voltage amplitude, the phase of synchronous output voltage, the power distribution of different units in parallel, improve the reliability of parallel operation of generator sets, and improve the efficiency and economy of unit operation.

The invention discloses a control method for an auxiliary power supply system. The method is applied to each parallel inverter and comprises controlling the inverter in a power drop mode after startup; judging whether a received mode control command is a current sharing command or a non-current sharing command; if the command is the current sharing command, controlling the output voltage of the inverter in a synchronous modulation manner so that carriers of all the inverters in the auxiliary power supply system are maintained at the same phase; if the command is the non-current sharing command, calculating the phase shift time coefficient, utilizing the phase shift time coefficient to adjust the phase of the output voltage when the output voltage of the current inverter is controlled according to the synchronous modulation mode to reduce the phase difference of the carriers of the inverters in the auxiliary power supply system. By means of the scheme, the switching loop current of theauxiliary power system is effectively reduced. A control system and device for the auxiliary power supply system is further disclosed, and corresponding technical effects are achieved.