New design of complete digital trigger in separating segment fashion;

Design of Digital Trigger Circuit of Three-phase Full-control-bridge Based on CPLD;

A simulation model in the Matlab is built, and the S-function is adopt in the design of digital trigger of the low-frequency power.

Based on investigating the theory of the model of the synchronous motor and vector control, this thesis designed the measuring device for detecting current crossing zero, the commutating logic circuit without circumfluence, the digital pulse flip-flop circuit.

The engineering method of digital trigger used in AC-AC converter system;

Based on the introduction of soft cut-in control system,and considering the characters of stall-controlled wind turbines,this paper presents a simple and reliable digital trigger algorithm--Double Remainder Algorithm.

This paper analyses the delay action produced in the process of pulse formation of the common thyristor trigger as well as its effect upon the fast response,and advances a kind of the digital trigger pulse formation circuit that can effectively eliminate the delay action so as to make the response speed of the digital trigger improve remarkably,whereby extending its application range.

To aim at the defect of the simulate trigger and the digital trigger with microcomputer,a new universal digital trigger based on CPLD and PLL is introduced.