98results about How to "Offset interference" patented technology

The invention discloses weld joint tracking detection equipment, which comprises a structured light generator for generating structured light, a beam expanding lens, a beam shaping device and an imaging device, wherein the beam expanding lens is positioned at the downstream of the structured light generator and is used for expanding beams of the structured light emitted by the structured light generator; the beam shaping device is positioned at the downstream of the beam expanding lens and is used for shaping the expanded beams to form surface structured light with preset shapes, so that light spots of preset shapes are formed on the weld joints; and the imaging device is used for imaging the light spots of the preset shapes on the weld joints. In the weld joint tracking detection equipment, the butt-jointed weld joints are detected and tracked by adopting the light spots imaged by the surface structured light, and narrow weld joints of which the width is less than 1 millimeter can betracked. The invention also provides a weld joint tracking detection method, which adopts the weld joint tracking detection equipment.

The invention provides a current control method of a cascaded converter sub-module working condition simulation system suitable for NLC, and the method is characterized by compensating a feed-forwardvoltage in a current controller to counteract the pulse voltage interference, caused by the nearest level control, of a to-be-measured object port, wherein the feed-forward voltage for compensating isgenerated through the following methods: method 1, calculating the difference value of the numbers of input sub-modules of two sub-module groups to be measured, and multiplying the difference value by the capacitor voltage of a single sub-module so as to generate the feed-forward voltage; and the method 2 comprises the following steps: sampling a voltage signal of a port of a to-be-measured object, carrying out low-pass filtering on the voltage signal, and taking the filtered voltage signal as the feed-forward voltage; and the feed-forward voltage is compensated into the current controller, so that current distortion caused by pulse voltage interference is avoided. Meanwhile, the invention provides a cascaded converter sub-module working condition simulation system and a sub-module test method. According to the invention, the working condition simulation of the cascaded converter sub-module based on nearest level control can be better realized.

The invention relates to a system and a method for eliminating common station site interference. The system comprises a first coupler, a transmission unit, an adjustment unit, an offset unit and a detection control unit, wherein the first coupler is used for extracting a signal transmitted by an interference base station as an interference offset signal, and coupling the interference offset signal to the transmission unit; the transmission unit is used for transmitting the interference offset signal to the adjustment unit; the adjustment unit is used for carrying out time delay, amplitude andphase adjustment of the interference offset signal to ensure that the interference offset signal and an interference signal received by a receiver from the interference base station through a wireless path have identical amplitudes and 180-degree phase difference; the offset unit is used for adding the interference offset signal adjusted by the adjustment unit to the interference signal received by the receiver from the interference base station, thereby offsetting the interference signal from the interference base station; and the detection control unit is used for controlling the adjustmentunit to carry out time delay, amplitude and phase adjustment of the interference offset signal according to the interference signal received by the receiver from the interference base station.