70results about How to "Guaranteed voltage" patented technology

The invention discloses a dual-12-pulse dual-flow brushless generator. The dual-12-pulse dual-flow brushless generator mainly comprises a base, a DC generator stator, a DC generator rotor, a rotatingshaft, an alternating-current generator stator, an alternating-current generator rotor, an end cover, an exciter stator, an exciter rotor, a bearing, a rotary rectifier and the control system. The DCgenerator rotor, the alternating-current generator rotor, the bearing and the exciter rotor are fixedly installed on the rotating shaft in the base cavity in order from front to back, the DC generatorstator, the alternating-current generator stator, the end cover and the exciter stator are fixedly arranged in the base in order from front to back, the groove of the inner circle of the DC generatorstator is internally uniformly embedded with 4 sets of 3-phase windings, wherein the phase angles of the two sets of windings are 0-degree electric angle, the phase angles of the other two sets of windings are 30-degree electric angle, and the four sets of windings are output and then form four sets of direct currents through the rectifier to output. The dual-12-pulse dual-flow brushless generator is simple in structure and flexible in power supply feature, and has no interference of an excitation source and stable performances.

The invention discloses a shift register, comprising: an input unit connected to a signal input terminal and a signal control terminal respectively, and the input unit is used to generate a charging signal according to an input signal provided by the signal input terminal and a control signal provided by the signal control terminal. Control signal and voltage hold signal; pull-up output unit, the pull-up output unit includes a pull-up node; a first charging unit, the first charging unit is connected to the pull-up node, the input unit and the first level signal terminal respectively, and the first charging unit The unit is used to charge the pull-up node according to the level signal provided by the first level signal terminal according to the charging control signal, and maintain the voltage of the pull-up node according to the voltage hold signal so that the drive signal output by the shift register has no voltage It can ensure that there is no drop in the output of this stage when the high-temperature TFT leaks, and effectively improve the display effect at high temperature. The invention also discloses an array substrate grid driving circuit and a display device.

A semiconductor device. In the conventional semiconductor device, there is a problem that the wiring width of the main wiring part through which the main current flows is narrow and uniform, and the cells in the device do not operate uniformly due to the voltage drop of the main wiring part. . In the semiconductor device of the present invention, the wiring width W1 of the one end 241 of the main wiring portion 24 through which the main current flows is set wider than the wiring width of the other end 242 of the main wiring portion 24 . The wiring width of the main wiring portion 24 gradually narrows from one end 241 to the other end 242 . Accordingly, it is possible to reduce the drive voltage difference between a cell located near the electrode pad portion 22 through which the main current flows and a cell located far away. As a result, the present invention suppresses the voltage drop of the main wiring portion 24 and realizes uniform operation of the cells in the element.

The invention discloses a highly-efficient inverter fractional order voltage and frequency control method under a microgrid off-grid mode. A mechanism modeling method and abc / dq coordinate transformation are employed to establish a state space model of an inverter in dq coordinates under the microgrid off-grid mode. Droop control, fractional order voltage PI control and fractional order current PI control are employed as voltage and frequency control method. The weighted values of two performance indexes including an integral value of the product of a voltage offset absolute value and time and the integral value of the product frequency offset absolute value and time serve as fitness functions. A colony evolution method based on adaptive variation operation is designed to optimize and set parameters of a fractional order controller, and optimized control signals generated after coordinate transformation are transmitted to a space vector pulse width modulation module, thereby realizing optimized operation of an inverter under the microgrid off-grid mode. Optimized voltage and frequency control effects under complex conditions and the microgrid off-grid mode can be realized.