摘 要：為了解決在應變測量中需要的高精度、低干擾并具有相對大的驅動能力的激勵源產生的問題。采用可編程基準源和驅動兩級電路，通過可編程的DAC生成電壓基準，再通過驅動電路，程控選擇電壓激勵源和電流激勵源的生成和輸出。所設計的程控精密激勵源具有體積小、精度高、功耗低、配置靈活的特點。實際應用表明，本設計達到了技術方案要求并已成功應用于實際的應變測量之中。
關鍵詞：應變測試；可編程電壓基準；激勵源選擇電路；恒流源；恒壓源
中圖分類號：TN86， TH823+.3 文獻標識碼：A
文章編號：1672-4984（2008）01-0025-03
Design of programmable precise power module
LONG Si-yu， LIN Jian-hui， MENG Jin-song
（Traction Power National Key Lab.，Southwest Jiaotong University，Chengdu 610031，China）
Abstract: This paper discussed a new power module which was comprised by programmable voltage reference and tow stage drive circuit. It could supply high precise， low noise power for the strain measurement. According the programmable DAC and drive circuit， it could supply the voltage reference for constant voltage source and constant current source controlled and chosen by FPGA. This power module has many advantages， such as small cubage， high precise and low power consumption. This power module has been already used in the practical works successfully.
Key words: Strain measurement； Programmable voltage reference； V/I change circuit； Constant voltage source； Constant current source
