一种新型混合式汽车继电器时序模型的建立

Establishment of a Novel Time Sequence Model of the Hybrid Automotive Relay

对混合式汽车继电器设计过程中的关键问题——电力电子器件与传统电磁式继电器的时序配合进行了理论分析和计算。根据混合式继电器的基本原理,建立了新型的混合式汽车继电器的时序逻辑模型,采用高频脉冲驱动方式使电力电子器件在继电器动态过程导通,并根据触头在电弧作用下的热力学方程,求解了造成电弧侵蚀的最小脉冲宽度,从而优化了混合式继电器的时序控制模型。样机试验表明,在有效保证系统无弧通断的条件下,大大减少了电力电子器件的发热,使电力电子器件无需加装散热片,为系统的小型化奠定了基础。

The key issue during the design of hybrid automotive relay--the time sequence cooperation of the power electronic device with the traditional electromagnetic relay is theoretical analyzed and calculated in this paper. According to the fundamental principle, a new time sequence model of the hybrid relay is established. The high frequency pulses are adopted to drive the power electronic device to conduct the circuit in dynamic process. And by solving the thermodynamic equilibrium equation, the least pulse width without arc corrosion is gained. Consequently, the time sequence model of hybrid relay is optimized and the heat emitted by power electronic devices would be greatly reduced, so the power electronic device doesn＇t need cooling fin. This new idea lays a good foundation of the system miniaturization.