Low power consumption combination switch based on CAN bus

LIU Wenying1, ZOU Hongbo1, WANG Dong2, LIU Guangyu1

(1.Institute of Information and Control, Hangzhou Dianzi University, Hangzhou 310018, China;

2.Jirui Heavy Industry Institute, Wuhu 241080, China)

Abstract: Aiming at solving the limitation and extension problem of existing combination switch,and to meet the need of low power consumption and low cost requirements in application,a new automobile combination switch was developed based on the controller area network and universal 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 performance 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%, dropping from the original 7.3mA to 3.8mA. This method can effectively reduce the power consumption of the system and has practical application value in the low cost automobile combination switch.

Key words: controller area network（CAN）; extensible; low power consumption