运算放大器锁零电路分析及其改进

基金项目:

长沙学院科研基金项目(SF91303)

详细信息

Analysis of Zero-locked Circuit of Operational Amplifier and Its Improvement

1.
Department of Mechanical and Electronic Engineering of Changsha University, Changsha 410003, China. 2.Law School of Shanghai University, Shanghai 200444, China

摘要: 分别介绍了目前常用的由NPN型BJT和由N沟道JFET构成的运算放大器锁零电路的工作原理；针对N沟道JFET运算放大器锁零电路的弊端提出了相应的改进方法，即将控制回路中的二极管改为电阻以方便维修，将N沟道JFET改为P沟道JFET以简化计算机锁零控制电路；最后指出采用继电器进行运算放大器锁零可以消除残余电压。
- 运算放大器 /
- 锁零电路 /
- 解锁 /
- 计算机锁零控制 /
- 继电器锁零 /
- 过流保护
Abstract: Working principles of existing zero-locked circuits for operational amplifiers composed of NPN BJT or N channel JFET were introduced separately and corresponding improvement methods were proposed for shortcomings of zero-locked circuit with N channel JFET，namely the diode could be replaced by a resistor for convenient maintain and N channel JFET could be replaced by P channel JFET for simplifying control circuit of computer locking zero. Finally it was pointed out that remaining voltage can be eliminated by use of relay in zero-locked circuit of operational amplifiers.
- operational amplifier, zero-locked circuit, unlocking, zero-locked control by computer, zero-locked with relay, over-current protectio