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针对半导体激光器(LD)出光稳定的应用要求,设计了一种有效的温度控制电路。电路基于单片热电制冷控制芯片ADN8830,采用闭环负反馈结构,使用恒流源测温电路代替普通H桥式测温电路,解决了非线性误差问题,通过比例积分微分(PID)补偿电路产生控制信号,驱动热电制冷器(TEC),实现了对LD工作温度的高精度控制。通过测试,LD工作温度在1 min内达到设定温度,30 min内,在25℃的工作温度下稳定度达±0.2℃。结果表明:该电路能快速、有效地控制TEC工作,达到稳定LD工作温度的目的。
Aiming at the application requirements of semiconductor laser (LD), an effective temperature control circuit is designed. The circuit is based on the monolithic thermoelectric cooling control chip ADN8830, adopts the closed-loop negative feedback structure, and uses the constant current source temperature measurement circuit instead of the ordinary H-bridge temperature measurement circuit to solve the nonlinear error problem. The control is produced by the proportional integral derivative (PID) compensation circuit Signal, driving the thermoelectric cooler (TEC), to achieve high-precision control of LD operating temperature. Through the test, the working temperature of LD reaches the set temperature within 1 min, and within 30 min, the stability of the LD reaches ± 0.2 ℃ under the working temperature of 25 ℃. The results show that this circuit can control the TEC quickly and effectively and achieve the purpose of stabilizing the working temperature of LD.