6 results about "Shoot through" patented technology

In a switched mode voltage converter device a switching node connects first and second transistor components and an inductor, and the device controls a voltage or current difference between the upper terminal and the inductor terminal. At high load conditions, during dead time, the inductor would normally drive current through the first transistor component once it is turned off, thereby tending to drive it towards being in forward bias ahead of the second transistor component turning on. To prevent this, the second transistor component turns on in a current limited mode, permitting enough current through to prevent the transistor component being in forward bias, in order to prevent shoot through when the second transistor component turns fully on. The second transistor component turns on in its current limited mode at or before the point when the first transistor component turns off. This enables the second transistor to control the voltage of the switching node to prevent the first transistor being in forward bias, whilst permitting the switching time to be minimised.

The utility model aims to provide a battery cell shell feeding device which solves the problem that threaded holes in battery cell shells are not easy to position, the battery cell shell feeding device comprises a feeding assembly and an overturning assembly, the overturning assembly is arranged on the feeding assembly, the feeding assembly comprises a linear module and a jig plate, the jig plate is arranged at the driving end of the linear module, and the linear module is arranged on the overturning assembly. A positioning groove is formed in the jig plate, a battery cell shell is covered with the cover plate, the cover plate is provided with a curved surface groove, a through hole is formed in the curved surface groove and used for being aligned with a screw hole in the battery cell shell, before the battery cell shell is screwed, the screw hole in the battery cell shell needs to be positioned, and shooting positioning is adopted for positioning. Therefore, the curved surface groove cannot hinder shooting, no shadow exists in the through hole, the threaded hole in the battery cell shell is positioned by shooting the through hole, and the problem that the threaded hole in the battery cell shell is not easy to position is solved.

The utility model discloses a high-voltage metering nameplate photographing rod, which relates to the technical field of using tools and comprises a primary insulating tube, the primary insulating tube comprises a main tube, a secondary insulating tube is inserted in the main tube, the secondary insulating tube comprises an auxiliary tube, an insulating main rod is inserted in the auxiliary tube and comprises a rod body, and the rod body is provided with a camera. The motion camera is installed in the camera protective cover and carries out shooting through the position of the transparent cover after the camera protective cover and the cover plate are clamped, the shooting angle is adjusted through the arranged camera support, and the height of the motion camera during shooting is adjusted through matched use of the first-stage insulating tube, the second-stage insulating tube and the insulating main rod; in conclusion, the problem that the lifting equipment is limited on a railway site is solved, and the use cost of the equipment is reduced; electric shock and high-altitude falling injury caused by manual climbing are avoided; operators can realize ground operation; the information is accurate, the collected information can be repeatedly checked, and the information can be checked at any time.

This invention provides an adaptive interlocked half-bridge drive circuit and a half-bridge drive system. The adaptive interlocked half-bridge drive circuit includes: an interlock control circuit that generates an interlock control signal based on an input voltage source; and a logic drive circuit, including an interlock circuit whose enable terminal receives the interlock control signal. When the interlock control signal is in a first state, the interlock circuit is disabled, and the half-bridge circuit is allowed to shoot through. When the interlock control signal is in a second state, the interlock circuit is enabled, and the half-bridge circuit is not allowed to shoot through. This half-bridge drive circuit can enable the interlock circuit according to usage requirements, allowing the upper and lower transistors of the half-bridge circuit to shoot through for a portion of the time, thus expanding the application of the half-bridge circuit.

The invention provides an active short circuit control method for an NPC type three-level inverter, the inverter comprises three phases of bridge arms, each phase of bridge arm comprises two upper bridge arm switch elements and two lower bridge arm switch elements, and the method comprises the following steps: receiving an active short circuit protection trigger signal; under the condition of receiving an active short-circuit protection trigger signal, controlling two upper bridge arm switch elements of each phase bridge arm of the inverter to be fully conducted and two lower bridge arm switch elements to be fully turned off, or controlling the two lower bridge arm switch elements of each phase bridge arm of the inverter to be fully conducted and the two upper bridge arm switch elements to be fully turned off; for at least one phase of bridge arm, the outer switching element of the two upper bridge arm switching elements to be switched on or the two lower bridge arm switching elements to be switched on is switched on in a delayed manner compared with the inner switching element at least in some cases. The invention also provides a control device for the inverter and a computer program product.

The invention discloses a sleeve core gas-solid interface charge distribution and discharge streamer measuring device and method, and relates to the technical field of ultra-high voltage transmission, a closed gas chamber loop module with a loop formed by an internal conductor and a measuring cavity and a gas storage cavity communicated is adopted, the capacity of loading voltage and current at the same time is achieved, and the measurement accuracy is improved. The measuring flexibility and operability are improved, the annular fixing piece is driven by the driving unit to move in the axis direction of the to-be-sleeved core, the capacitance probes arranged on the annular fixing piece form a multi-channel synchronous array of charge distribution, and the to-be-measured sleeve core is installed in the measuring cavity. The guide rod and the conductors of other closed gas chambers form a through-flow loop; the interface discharge streamer observation module carries out test process shooting through an observation window, and the direct current voltage loading module and the load current applying and temperature regulating module provide external stress for charge accumulation under different voltages and different temperatures and provide external stress for discharge streamers, so that the test range is widened.