6 results about "Parallel excitation" patented technology

The invention relates to an external excitation inductance parameter design method, a resonant converter and an electric energy conversion system. The method comprises the following steps: determining design indexes and electrical performance parameters of the resonant converter; setting target dead zone time; determining a first expression, a second expression and a third expression of the external parallel equivalent excitation inductor; calculating according to the design indexes, the electrical performance parameters, the target dead zone time, the first expression, the second expression and the third expression, and judging whether the inductance value of the external parallel equivalent excitation inductor meets the requirement or not; if the requirements are met, parameter design of the external parallel equivalent excitation inductor is completed; and if not, readjusting the target dead zone time. According to the LLC resonant converter, the overall efficiency of the LLC resonant converter can be remarkably improved, the LLC resonant converter is suitable for batch and automatic engineering design, the innovative structural design of the external parallel excitation inductor can be flexibly and accurately adjusted, the structure of the main magnetic core does not need to be changed, and the limitation of conventional air gap adjustment is broken through.

The invention discloses a piezoelectric electromagnetic bimorph sensing structure and a simulation analysis method thereof, and relates to the technical field of sensor design and simulation. The structure comprises a PZT5H piezoelectric layer, an AFC260 alloy elastic blade layer and a PZT5H piezoelectric layer which are stacked in sequence, terminal-ground-terminal parallel excitation is adopted to induce bending vibration, and the resonant frequency can be accurately tuned within the range of 2327 kHz through additional mass. The structure can be further compounded or coupled with a FeGa magnetostrictive layer to form a magnetoelectric sensing unit for non-contact current measurement. According to the matched simulation method, accurate prediction and optimization of resonant frequency, vibration amplitude and stress distribution are realized through parametric modeling, grid encryption, electromechanical / magnetoelectric multi-physics field coupling analysis and stress evaluation. The device is high in integration level and flexible in tuning, remarkably shortens the development period through simulation driving design, improves the reliability, and is suitable for the field of power monitoring and micro sensing.

The invention provides a pre-balanced parallel excitation method and device, and belongs to the technical field of lithium ion batteries, and the method comprises the steps: starting equipment, switching a relay to a current sharing gear, and carrying out the current sharing of different parallel battery monomers until the equipment detects that the current sharing is completed; switching the relay to an excitation gear, and carrying out an impedance test; and collecting excitation current and response voltage flowing through each parallel single body, switching the relay to a current sharing gear after the test is completed, and ending the test. The battery pack does not need to be disassembled to damage the integrity of the battery pack. Impedance data of all the batteries under the same SOC can be collected at a time, and compared with traditional single-channel equipment, the detection time can be saved by more than 99%.

The invention provides a synchronism detection and abnormity protection device and method for a spacecraft multi-set parallel excitation vibration test system, and the device comprises a vibration controller, a vibration table, power amplifiers, a current sensor, an acceleration sensor, and a synchronous detection circuit box. Each power amplifier is in power signal connection with an independent vibration table, each power amplifier is connected with an independent current sensor, each vibration table is connected with an independent acceleration sensor, and the current sensors and the acceleration sensors are in signal connection with a synchronous detection circuit box. And the synchronous detection circuit box is in signal connection with the vibration controller.

The embodiment of the application provides a fusion system of a phase modifier and an in-station energy storage of a new energy power station, comprising: a phase modifier and an energy storage system arranged in the new energy power station, the fusion system comprises an energy storage independent excitation mode, an energy storage excitation and self-parallel excitation complementary mode, an energy storage independent starting mode and an energy storage standby starting mode, the application can effectively fuse the phase modifier and the energy storage system in the new energy power station, improve the reliability of the phase modifier equipment and the utilization rate of the energy storage system, and fully play the supporting role of the phase modifier on the new energy power grid.

This invention discloses an ultra-wideband side-fire Vivaldi phased array antenna conformally to the surface of a flight platform fuel tank, and the flight platform fuel tank itself. The antenna body includes: a dielectric substrate layer conformally to the composite material surface of the flight platform fuel tank, and a metallic radiating layer and a feed network layer attached to the upper and lower surfaces of the dielectric substrate. The metallic radiating layer has a mirror-symmetrical bidirectional extension structure; it has gradually widening outward-facing slots and a circular resonant cavity on both sides, achieving a side-fire effect after conforming to the cylindrical surface. The feed network uses a microstrip line structure to provide parallel excitation signals to the metallic radiating structure. This invention is suitable for large-area array deployment on the surface of a flight platform, effectively solving the contradiction between low antenna profile, wide bandwidth, and high-gain side-fire while maintaining the aerodynamic shape.