一种基于单片机的脉冲输出微安级恒流源设计

Design of Pulse Output Microamp Level Constant Current Source Based on Single Chip Microcomputer

恒流源在各类电子电路中应用非常广泛,但是微安级恒流源易受电路中噪声、纹波等影响,而使恒流效果变差,稳定性不高。针对微安级恒流源存在的问题,设计了一种微安级恒流源。该设计可在负载大范围变化时,输出电流依旧保持恒定。通过仿真结果证明了该设计的微安级恒流源可在负载0~100K变化范围内,输出恒定的微安级电流,精度±5%。

The constant current source is widely used in all kinds of electronic circuits,but the micro current constant current source is easily affected by the noise and ripple in the circuit,which makes the effect of constant current worse and the stability is not high. Aiming at the problems of micro current constant source,a micro constant current source is designed. The output current is still constant when the loads changes in a wide range. The simulation results show that the designed micro constant current source can output constant micro current within the range of 0-100 K,and the accuracy is ± 5%.