53 results about "Commutation cell" patented technology

The invention concerns a voltage source converter (10) comprising a number of valves (V1, V2, V3, V4, V5, V6), the valves comprising switching elements with anti-parallel diodes provided in a bridge for switching between two states, where the bridge is provided in at least one phase leg that stretches between two direct current poles (P1, P2) and has at least one midpoint, which is connected to an alternating current terminal (TA, TB, TC), wherein the switching element of at least one valve is a thyristor, and the converter further comprises a commutation cell (CCA, CCB, CCC) associated with the valve, where the commutation cell is controllable to reverse-bias the valve if it is to stop conducting current.

An arc discharge protection apparatus operating in a current detection mode aims to prevent arc discharge caused by abnormal conditions in a high voltage output zone. The arc discharge protection apparatus has a current signal sampling unit to receive an arc discharge current signal generated in the high voltage output zone, an interpretation unit to provide a determination level to sift out an abnormal current frequency signal, a commutation unit to receive and rectify the abnormal current frequency signal and output an arc DC signal, and a touch control unit driven by the arc DC signal to output a trigger signal to stop operation of the high voltage output zone. Thereby sparking or burning caused by heat accumulation of the peripheral elements resulting from the arc discharge can be prevented.

The invention relates to a 3N−4-level (N≧3) voltage converter including:3N−5 direct voltage generators (1, 2, 3, 4) connected between two input voltage terminals (V+, V−),two lateral commutation branches (10, 11), each connected between an output terminal and an input voltage terminal (V+, V−) and comprising N−1 series connected commutation cells (20, 21, 22, 23),2N−4 central commutation branches (12, 13), each comprising a switch bidirectional in terms of voltage and current and being connected between two commutation cells of a lateral branch (10, 11) and two generators, andN−2 pairs of diode cells (16) each connected to two of the 2N−4 central commutation branches (12, 13). The diodes (14, 15) of one pair are series connected, in the same direction, and are connected together by a middle point connected between two generators.

The invention discloses a workpiece reversing device and workpiece placing equipment provided with the same. The workpiece reversing device comprises a transmission unit for conveying a workpiece andan outputting mechanism, wherein the outputting mechanism is arranged on the transmission unit and comprises a plurality of outputting channels and reversing units arranged on the paths of the outputting channels; and the reversing units adjust the workpiece outputting direction. The outputting mechanisms are arranged on the transmission unit; when the workpieces are conveyed on the outputting channels, the reversing units adjust the direction during the conveying process, and conveying of the workpieces in the outputting channels is not delayed at the same time, so that the defect that the surface of the workpiece is worn when an external clamping device clamps the workpiece is overcome, and the situation that the workpiece quality is reduced due to clamping is avoided; and the reversingunits are arranged on the conveying paths of the outputting channels to avoid manual direction adjustment of the workpiece and increase the productivity of the workpiece.

The invention relates to an E-ACT fixed-point position control and speed measurement system and method based on the SENT protocol. The system includes: acquisition operation unit, external power supply unit, pulse commutation unit, host computer control display unit, electric ACT sensor. The method includes: when the positioning control is started, the acquisition operation unit receives the positioning control command from the upper computer control display unit, and adjusts the PWM pulse control signal to the pulse reversing unit so as to control the electric ACT sensor to move to the specified position. When the speed test is started, the acquisition operation unit collects and analyzes the position information of the electric ACT sensor in real time, and calculates its average speed. The invention not only has the function of analyzing the SENT protocol, but also can measure and calculate the motion speed of the ACT and precisely control the position of the ACT at the same time, the control response speed is fast, and the control of any position can be completed within 1 second. And the time base for calculating the speed is as high as ns level, with high precision.

The invention relates to a light-operated door magnetic sensor, which comprises a commutation unit, a voltage division unit and a voltage control unit, wherein the voltage control unit is connected with the voltage division unit and the commutation unit respectively; the voltage division unit is connected with the commutation unit; the commutation unit is provided with two connection terminals which are connected with a door control interface respectively; the voltage division unit is provided with a photosensitive device; the voltage of the connection point of the voltage control unit and the voltage division unit is reduced to turn off the voltage control unit in light environment; the voltage of the connection point of the voltage control unit and the voltage division unit is increased to turn on the voltage control unit in dark light environment. The light-operated door magnetic sensor can response to the light environment in a base station timely, the condition that a person opens a door to enter the base station or light is used can be effectively detected, and a power supply is not required to be mounted.