2results about How to "Avoid dead time" patented technology

The application discloses a working mode detection method and circuit of an active clamp flyback converter, a main control chip, samples a drain end voltage VDS of a main power tube QL in a current period, detects a first voltage drop time of the main power tube QL after the main power tube QL is turned off, and determines the working mode of the current period of the active clamp flyback converter by judging the sequence of the first voltage drop time and a clamp tube driving time. Furthermore, based on the working mode determination result, the dead time of the active clamp flyback converter is accurately adjusted to be suitable for the detected working mode, the problem of mismatching between the dead time and the working mode is avoided, the main power tube QL of the active clamp flyback converter can keep realizing soft switching in a full load range, the switching loss of the active clamp flyback converter is greatly reduced, and the efficiency of the converter is improved.

The utility model discloses an internal mixing rubber cutting machine with a weighing function, which relates to the technical field of rubber cutting machines and comprises a machine body, a plurality of supporting legs are arranged at the bottom of the machine body, non-slip mats are arranged on the bottom surfaces of the supporting legs, supporting plates are arranged on two sides of the machine body, a top plate is arranged at the top of each supporting plate, and a weighing device is arranged on the top plate. A top plate is arranged on the machine body, a cutting mechanism is arranged on the top plate, a guide mechanism is arranged on the machine body and located on one side of the cutting mechanism, a weighing body is arranged on the machine body and located on one side of the guide mechanism, and a split-screen display mechanism is arranged on the machine body and located on one side of the guide mechanism. The guide mechanism can facilitate movement of rubber materials on the machine body, cutting is facilitated, manpower is reduced, the split-screen display mechanism can display poor weight, the difference weight of the rubber materials can be conveniently compared, and the rubber materials can be seen only at the rubber cutting machine after weighing is completed and do not need to be repeatedly confirmed at the rubber material weighing position.