摘要
为解决现有基于LIN总线组合开关连接节点有限、不易扩展的问题及应用中对低功耗、低成本的要求,应用具有CAN控制器的STM32系列微控制器,开发了基于控制器局域网和通用串行总线的车用组合开关。通过对组合开关休眠模式下主从节点各模块的功耗分析,建立了其休眠功耗与电源模块静态功耗间的关系,提出了通过在硬件上采用以NE555为核心的延时调压节能电路来降低组合开关休眠模式下电源模块的静态功耗。在基于STM32的组合开关上,对延时调压节能电路的降功耗性能进行了评价,并进行了休眠模式下的功耗调节试验。实验结果表明,通过调节NE555定时器输出信号的占空比,可将组合开关休眠功耗由最初的7.3 mA降到3.8 mA,功耗降低近50%;该方法能够实现有效降低系统休眠功耗,在低成本的车用组合开关中具有应用价值。
Aiming at solving the limitation and extension problem of existing combination switch, and to meet the need of low power consump- tion and low cost requirements in application, a new automobile combination switch was developed based on the controller area network and u- niversal asynchronous transceiver by using STM32 series micro controllers. After the analysis of the combination switch＇s dormant static power consumption, the relationship between its dormant power consumption and power supply module＇s static power consumption was established. A method was put forward by using the hardware time delay regulating circuit based on NE555 to reduce the consumption. The method＇s per- formance of consumption regulating was tested in the designed combination switch based on STM32. The results indicate that by adjusting the duty cycle of the NE555 timer output signal, the dormant power consumption of the combination switch can be reduced by almost 50%, drop- ping from the original 7.3 mA to 3.8 mA. This method cau effectively reduce the power consumption of the system and has practical applica- tion value in the low cost automobile combination switch.
出处
《机电工程》
CAS
2013年第11期1406-1409,1429,共5页
Journal of Mechanical & Electrical Engineering
关键词
控制器局域网
易于扩展
低功耗
controller area network（CAN）
extensible
low power consumption
