61results about How to "Realize cascading" patented technology

The invention provides a mining intrinsic safety type power box which comprises an outer shell, a switch, a charging connector, a cascading connector, an output connector, a charging battery and a circuit board, wherein the switch, the charging connector, the cascading connector and the output connector are fixedly installed on the outer shell in a sealed mode, and the charging battery and the circuit board are arranged inside the outer shell. A discharging control circuit, an undervoltage detection circuit, a first isolation converting circuit, a second isolation converting circuit, a first automatic switchover circuit, a second automatic switchover circuit, a first intrinsic safety protection circuit, a second intrinsic safety protection circuit and a light-emitting diode (LED) indicator light are arranged on the circuit board. The battery is in electric connection with the charging connector and the discharging control circuit respectively. The discharging control circuit, the undervoltage detection circuit, the two isolation converting circuits, the two automatic switchover circuits and the two intrinsic safety protection circuits are respectively and sequentially in electric connection. The switch is electrically connected with the discharging control circuit. The automatic switchover circuits are in electric connection with the cascading connector. The intrinsic safety protection circuits are in electric connection with the output connector. When the mining intrinsic safety type power box is used, operation and cascading are convenient, working is reliable, safety performance is good, automatic switchover can be achieved, and an emergency power supply can be incessantly supplied for a communication base station for a long time.

The invention discloses a method for modulating single-phase cascade alternating-current high-frequency link bidirectional converters. The method includes generating direct-current voltage signals with identical amplitudes by the aid of direct-current power supplies of various high-frequency link units; modulating the direct-current voltage signals by the aid of preceding-stage inverters and generating identical high-frequency square-wave voltage signals; carrying out voltage class transformation and electric isolation by the aid of high-frequency transformers; carrying out decoupling modulation by the aid of matrix converters, allowing the matrix converters to be equivalent to two groups of independent inverters and controlling the two groups of independent inverters; carrying out carrierphase-shift cascade modulation on the various high-frequency link units, carrying out cascade on voltages outputted by the various high-frequency link units, filtering the voltages and then generating stable sine waves. The method has the advantages that the method is flexible and reliable, high equivalent switching frequencies can be obtained under the condition of low device switching frequencies, output voltage waveforms can be improved, and output harmonic waves can be reduced.

The embodiment of the invention discloses a video processor comprising a video input processing device, a video output processing device, a master control device and a backboard device. The backboarddevice comprises a matrix switching module, a video input processing device connecting port, a video output processing device connecting port, a master control device connecting port, an extension device connecting port and a programmable logic device. The programmable logic device is connected with the master control device connecting port and the extension device connecting port and connected with the video input processing device connecting port through a first ethernet physical layer transceiver group and connected with the video output processing device connecting port through a second ethernet physical layer transceiver group. The invention also discloses a backboard communication method. The communication rate can be enhanced and point-to-point communication can be realized.

The invention provides an extended multi-input multi-level conversion circuit which comprises a preceding-stage converter X and a backward-stage full-bridge unit Y. The preceding-stage converter X comprises a direct-current input voltage source V0 and i switched capacitor basic modules. The relationship between the output level number N of the extended multi-input multi-level conversion circuit and the number i of the switched capacitor basic modules is as follows: N=4i+5; wherein the switched capacitor basic module comprises a switching tube S<i,1>, a switching tube S<i,2>, a switching tube S<i,3>, a switching tube S<i,4>, a diode D<i,1>, a diode D<i,2>, a diode D<i,3>, a capacitor Ci and a direct-current input voltage source Vi, and i belongs to N<*>; the rear-stage full-bridge unit Y comprises switching tubes Q1, Q2, Q3 and Q4; and the collector of the switching tube Q1 in the rear-stage full-bridge unit Y is connected with the emitters of the switching tube S<i,4> in the front-stage converter X. Cascading of basic modules of the switched capacitor is realized, and the problem of unbalanced capacitor voltage is solved.