30results about How to "Simple pressure control" patented technology

The present invention proposes a variable winding starter generator, which includes rotor core, stator core, coil, shaft and casing, etc., and is characterized in that each stator pole has a centralized coil with one m-turn and one n-turn; when the When the variable-winding starter-generator used for automobiles is used as a starter, the switch connects all the coils on the stator poles with the same phase in series to form a phase armature winding, and each phase armature winding is connected to an asymmetrical half-bridge with a body diode After the converter, it can run electrically in the switched reluctance motor mode; when the automobile variable winding starter generator is used as a generator, the n-turn coils on all stator poles are connected in series to form an excitation winding, and the stator poles with the same phase The m-turn coils on the upper part are connected in series or in parallel to form a phase armature winding, and the starter generator operates in the mode of electric excitation double salient pole generator to generate electricity. The starter generator of the invention can effectively utilize the advantage of relatively high efficiency of the switched reluctance motor, and also effectively utilize the advantages of simple voltage regulation and control of the electrically excited double salient pole generator.

The invention discloses a bidirectional DC-DC converter mixed with LLC and DAB, which comprises an H-bridge circuit, two LLC resonant cavities, two isolation transformers with the same conversion ratio and a three-phase half-bridge full-control circuit; , the two ends of the H-bridge circuit and two series-connected split resonant capacitors are connected to both ends of the input power supply, the original side of the isolation transformer with the same name is connected to one end of the resonant inductor of the resonant cavity, and the other end of the resonant inductor is connected to the neutral point of the half-bridge of the H-bridge circuit , the same-named end of the secondary side of the isolation transformer is connected to the neutral point of the bridge arm of the three-phase half-bridge full-control circuit; the non-identical end of the two isolation transformer secondary sides are connected to the neutral point of the bridge arm of the three-phase half-bridge full-control circuit. The invention utilizes the advantages of LLC frequency conversion and voltage regulation and DAB phase-shift voltage regulation, combined with PWM pulse 180º phase-shift to realize fast switching between LLC and DAB, realizes optimal control of efficiency under different load rates or voltage gains, has small switching loss, high efficiency, The advantage of simple structure.

The invention provides a compound-driven two-stage projectile accelerating device and an experimental platform. The accelerating device includes a primary accelerator and a secondary accelerator. The primary accelerator includes a solenoid valve connected to a high-pressure gas source, and the head end of the solenoid valve and the shell Connection, a piston is built in the casing, and a manual valve is connected to the casing, and the piston is reset by opening the lower manual valve and the upper manual valve; the secondary accelerator includes a secondary accelerator frame, an acceleration pipeline, and at least one The slide rail and at least one set of electric motors, the solenoid valve controls the release of high-pressure gas, and pushes the piston to accelerate. The piston pushes the projectile for a primary acceleration and enters the acceleration pipeline of the secondary accelerator. The motor drives the flywheel to rotate through friction to form a secondary accelerate. The invention uses high-pressure gas and electric motor as the source power, accelerates the elastic body through a two-stage acceleration mechanism, injects it into the water tank at high speed from the acceleration pipeline, and sets a high-speed camera outside the water tank to record the test process.

The invention discloses an ultra-wide voltage range isolation type LLC converter, comprising two high-voltage side H bridge circuits, two LLC resonant circuits, two isolating transformers with the same transformation ratio and three-phase bridge circuits; The H-bridge circuit on the high-voltage side is connected to the power supply at the input end, and the primary side of the isolation transformer is connected to the midpoint of the LLC resonant circuit and the H-bridge circuit respectively; the secondary side of the isolation transformer is connected in series in reverse polarity, and the three nodes of the transformer group are connected in series. to the neutral point of the three-phase bridge circuit; the invention utilizes the advantages of LLC frequency conversion and voltage regulation, and combines the 180º phase shift of the PWM pulse to realize fast switching between series and parallel, which can realize the output voltage adjustment in a wide range, and at the same time play the role of the PWM rectifier within a certain safety range. The invention has the advantages of small switching loss, high efficiency, high power density of the power supply and small volume.