关键词: 现场可编程门阵列（FPGA）, 流水线, 浮点和定点PID控制器, 全数字逆变电源

Abstract: A new fast PID technique based on FPGA is introduced.The paper analyzes different PID formulas，adopts pipelining technique and discusses in detail correlative design questions of floating and fixed point PID controllers in FPGA，which only need 480 ns and 120 ns for one circle calculation.Conversion controllers between single-precision floating and sixteen bits fixed point numbers are designed to make floating point controller more usable.At last，the paper designs a hardware experiment platform of full digital inverter to validate the fast floating and fixed point PID controllers.The result indicates that the welding power source works well and the fast PID controllers based on FPGA can run fast enough and reliably，which can be used in a fast control system in big interference environment.

Key words: Field Programming Gate Array（FPGA）, pipelining, floating and fixed point PID controllers, full digital inverter