防倒灌电流型安全电源系统设计与实现

发布时间：2018-01-19 14:09

本文关键词： 电源冲击电流快速热插拔门限电路　出处：《武汉大学》2017年硕士论文　论文类型：学位论文

【摘要】：电子信息时代,消费电子产品、物联网智能家居、网络通信平台等电子设备对人们日常生活的影响越来越大。而这些电子设备的核心便是电源,电源为所有的系统电路提供一定功率的电能。随着开关电源的面世,电源由传统的高功耗、大体积逐渐发展成如今的轻小、低功耗、高效率。其中,电源的效率与安全稳定性两个特点备受广大的电源开发者的关注。在通信系统中最常见的电源操作便是电源的热插拔。而热插拔引起的冲击电流效应会对电源的安全稳定性造成很大的影响,所以热插拔一直是业内关注的主要问题。为此,全球范围内以美信、德州仪器和亚德诺为代表的半导体公司都针对热拔插的问题提出了自己的解决方案和相对应的控制器芯片。此外,出于电路成本以及实际系统电路的电源接口情况考虑,长短针法抑制冲击电流电路和分立器件有源冲击电流抑制电路都存在着一定的应用。本文在分析研究热插拔冲击电流问题的基础上,探究了通信电路系统中热插拔偶尔会导致缓慢启动电路失效的问题。在快速热插拔的时候,系统电路的后级储能电容会反灌电流到前级的低阻抗回路,从而影响开关管栅极充放电电容的及时放电。此时单板快速热插拔必然会导致未关断的开关管无法正常进入缓慢启动状态。针对电路单板的快速热插拔操作引起的电源缓慢启动模块失效问题,本文提出了采用门限电压控制电路结合有限冲击电流抑制电路的电路设计方案。系统电路设计主要包含输入电源充放电模块、上电电压斜率控制模块、门限电压控制模块与其他辅助设计电路模块。在针对每个电路模块进行理论分析之后,本文采用电源专业仿真软件Saber进行系统电路的仿真验证分析。不同于一般的电路仿真软件,Saber是一款全球最先进的综合系统化仿真软件。仿真分析结果表明本次设计具备可行性而且其在电源热插拔时的工作状态基本与理论分析一致。在实际电路测试分析之前,本文对分立元器件的选型规范做了详细的阐述并结合系统电路的设计需求进行了元器件选购。实际测试表明,在分立器件有源冲击电流限制电路上加入门限控制电路可以很好的实现阻断后级储能元件反灌电流,从而解决单板快速热插拔引起的缓慢启动电路失效的问题。总之,系统电路实际测试良好,电路设计简单且成本较低,在大型电路系统涉及到单板快速热拔插的时候具有很好的应用价值。
[Abstract]:In the era of electronic information, consumer electronic products, Internet of things smart home, network communication platform and other electronic devices have more and more influence on people's daily life. And the core of these electronic devices is power supply. Power supply provides certain power for all system circuits. With the advent of switching power supply, power supply from traditional high power, large volume gradually developed into today's light, low power consumption, high efficiency. The efficiency and safety and stability of power supply have attracted the attention of the majority of power developers. The most common operation of power supply in communication system is the hot plug of power supply. The impact current effect caused by hot plug will affect the power supply. Safety and stability have a great impact. So hot swapping has always been a major concern in the industry. For this reason, the United States across the globe. The semiconductor companies represented by Texas Instruments and Adriano have put forward their own solutions and corresponding controller chips to the hot plug problem. Considering the cost of the circuit and the power interface of the actual system circuit. There are some applications in both the long-short needle current suppression circuit and the discrete device active impulse current suppression circuit. In this paper, the hot plug impulse current problem is analyzed and studied. This paper probes into the problem that the hot plug in the communication circuit system occasionally leads to the failure of the slow start circuit. At the time of fast hot swapping, the energy storage capacitor of the system circuit will reverse the current to the low impedance loop of the front stage. This will affect the timely discharge of the charging and discharging capacitance of the switch gate. At this time, the rapid hot swapping of the single board will inevitably lead to the unturned switch tube can not enter the slow start state normally. The fast hot swapping operation of the single board of the circuit will lead to the fast hot swapping operation of the circuit board. Failure of the power supply slow start module. In this paper, a circuit design scheme using threshold voltage control circuit combined with limited impulse current suppression circuit is proposed. The circuit design of the system mainly includes charge and discharge module of input power supply and control module of voltage slope. Threshold voltage control module and other auxiliary design circuit modules. After theoretical analysis for each circuit module. In this paper, the power professional simulation software Saber is used to verify and analyze the system circuit, which is different from the general circuit simulation software. Saber is one of the most advanced comprehensive and systematic simulation software in the world. The simulation results show that the design is feasible and its working state in hot plug out of power supply is basically consistent with the theoretical analysis. Before the road test analysis. In this paper, the specification of the type selection of discrete components is described in detail, and combined with the design requirements of the system circuit, the components are selected and purchased. The actual test shows that. Adding threshold control circuit to the active impulse current limiting circuit of discrete device can block the backflow current of energy storage element. In short, the system circuit is tested well, the circuit design is simple and the cost is low. It has a good application value when the large circuit system involves the single board rapid hot-plug.
【学位授予单位】：武汉大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN86

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