Constant temperature control of the SLED underlying an adjustable driving-current
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摘要: 为了解决大功率半导体超辐射发光二极管(SLED)的恒流、恒温驱动问题,使这类光源可以在恒定温度条件下,实现驱动电流连续调节的工作模式,设计了一种控制器,使用单片机MSP430作为其主芯片,采用脉宽调制和比例-积分-微分算法及半导体制冷器实现对光源温度的精密控制。实验中,控制器可以使光源在环境温度为10℃～40℃范围内稳定工作,温度稳定性可达到0.1℃,而其驱动电流则在0mA～200mA范围内连续可调,且恒定驱动电流可在全程范围内稳定在0.1mA。结果表明,所设计的控制器完全可以满足SLED的工作要求,满足了白光干涉系统对于光源的稳定性的需要。
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关键词:
- 激光器 /
- 超辐射发光二极管 /
- 脉宽调制 /
- 比例-积分-微分算法 /
- 驱动电流连续可调
Abstract: A variable constant-current driver was proposed for a super luminescent diode (SLED) to meet the constanttemperature working requirement.This method was carried out by a microcomputer, MSP430, combining with proportional-integraldifferential(PID) algorithm and a semiconductor cooler.Driven by this controller,the SLED generated a stable output power and central wavelength.Experimental results demonstrated that the temperature accuracy of 0.1℃ was achieved when the environmental temperature changed from 10℃ to 40℃.The constant-driving current was stabilized at 0.1mA in the range from 0mA to 200mA.Thus,the driver can meet the demand of SLED application. -
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