單晶片DSP為基礎的全數位控制可程式直流電流源之研製

Abstract

隨著高性能數位信號處理器(Digital Signal Processors)的發展,我們利 用一個數位信號處理器來完成直流電流供應器(DC current power supply)的控制。在模型化方面,採用狀態空間平均化(state-space averaging)的方法來建立功率級的小訊號數學模型,並應用狀態回授控制( state feedback control)理論於此直流電流源的設計上,穩態誤差( steady-state error)可藉由引入一個積分器來消除。此外,透過電腦輔助 設計(computer-aided design)可以找到一組最佳的回授增益,使得輸出步 階響應能最吻合所期望的步階響應。 With the high performance and increasing reliability of digital signal processors (DSPs), a DSP-based digital controller is used in a DC current power supply. The state-space averaging method is adopted to derive the small-signal mathematical model of the power stage. We employ the state feedback control theory in designing a DC current source. By introducing an integrator that integrates the error between reference level and output current, the steady-state error could be eliminated. In addition, a set of optimal feedback gains is found by computer- aided design such that the output step response can match the desired step response.