高可靠性小型固体动力运载火箭时序控制器设计

Design of time serier controller for highly reliable small solid dynamic launch vehicle

摘要:

阐述了时序控制器电路原理,采用Microsemi公司的A3P250系列FPGA作为控制器,设计了一款高可靠性的时序控制器。围绕可靠性,从结构、硬件及软件设计等方面,介绍了设计方案,该时序控制器在硬件电路设计中采用了安全性设计措施,在时序测试中,能够将火工品点火回路短接,在火工品阻值测试中,能够断开点火回路确保火工品的绝对安全。在软件设计中,采用了FPGA仲裁机制,只有按照预定的测试流程,按照特定的逻辑顺序,才能完成相应的功能。在设计定时器时,采用格雷码计数器,有效地避免了计数器累加时位寄存器翻转产生的亚稳态现象。该时序控制器参加了火箭的多次飞行试验,具有相当的稳定性和可靠性。

Abstract:

The design of time series controller circuit is described in detail in this paper.A3P250 series FPGA of Microsemi company is adoped as the controller,time series controller with high reliability is designed.Based on reliability,the design scheme is introduced from the aspects of structure,hardware and software design.The time series controller adopts the safety design measures in the hardware circuit design,in time series test,the ignition circuit of the plant can be short connect and in the resistance test of initiating explosive devices,the ignition circuit can be disconnected to ensure the absolute safety of the initiating explosive devices.In the software design,the FPGA arbitration mechanism is adopted,and the corresponding functions can be completed only according to the predetermined test process and the specific logical order.Gray code counter is used in the design of timer,which can effectively avoid the metastability phenomenon caused by register overturning of counter. The time series controller has participated in many flight test of the rocket and has considerable stability and reliability.