一种具有新型过温保护功能的LED恒流驱动电路  

Design of constant current driver of LED circuit with late-model over-temperature buffer protection

作　　者：陶亮[1] 曾以成[1] 武世明 

机构地区：[1]湘潭大学光电工程系,湖南湘潭411105

出　　处：《太赫兹科学与电子信息学报》2015年第4期659-664,共6页Journal of Terahertz Science and Electronic Information Technology

摘　　要：设计了一种具有滞回和过温缓冲保护功能的发光二极管(LED)恒流驱动电路。该电路由恒流驱动模块、滞回和过温关断模块、延时复位模块、滞回和过温缓冲模块组成;实现了电路的双温度滞回和过温缓冲保护功能,可对缓冲阶段所处的时域区间和温度区间进行调节。电路在过温缓冲跳变点和过温关断点附近分别有5℃和29℃的温度滞回区间,避免了电路发生热振荡,增大了电路正常工作区的范围,可保证电路高效稳定地运行。The experiment focuses on the design of constant current driver of Light Emitting Diode(LED) circuit with hysteresis and over- temperature buffer protection, which consists of four modules a constant current driver module,an over-temperature shutdown module,a delay reset module and an over-temperature hysteresis buffer module. The design has realized the function of double temperature hysteresis and thermal buffer protection. The time-domain and temperature range are adjustable in this stage of buffer. The circuit has a temperature hysteresis interval of 5 ℃ and 29 ℃ in the thermal buffer jump points and thermal breakpoint respectively, which avoids the thermal oscillation in circuit. This design expands the span of the normal work area of the circuit,ensuring a stable and efficient operation of the circuit.

关 键 词：恒流驱动 温度滞回 延时复位 过温缓冲保护 热振荡 

分 类 号：TN312.8[电子电信—物理电子学]