【作者】 高鹏；

【导师】 周泽坤； 王德成；

【作者基本信息】 电子科技大学 ， 工程硕士（专业学位）， 2020， 硕士

【摘要】 随着信息化的高速发展,大量的通信设备、服务器、工作站等被广泛的应用,这就需要一种安全可靠的大容量电源系统来不间断的供电。如果采用单个电源供电,那么对电源的输出功率和长期可靠性则提出了较高的要求,而且一旦出现故障,会导致系统整体崩溃。采用多个电源模块并行供电,来实现大功率输出是电源管理技术发展的一个方向。负载均流控制器作为一种电源控制集成电路,在分布式电源系统中具有广泛的应用。通过控制多个并联电源模块,达到均流分配供电,每个电源模块只需输出均衡的输出较小的功率,提高了电源系统的稳定性,解决了单个电源供电所面临的问题。通过对目前现有的均流方式进行了研究和分析,本文根据实际使用需要,提出了一种基于最大电流自动均流方式的负载均流控制器的设计与实现。结合用户的指标要求和电路采用的器件类型,本课题芯片采用BCD工艺进行设计,通过从电路、版图、模块和系统等方面进行综合因素的考虑,使整体电路的在精度、功耗、驱动和速度等方面有较好的效果,最终实现了一种低失调(失调电压≤100μV)、低均流误差(均流误差≤5%)的高精度负载均流控制器。论文重点对电路的各模块单元及版图整体布局进行深入的讨论和研究,通过对电路优化设计,并结合产品的使用要求和环境温度进行综合仿真验证,使电路的设计满足用户提出的指标要求。版图设计上采用Cadence软件的全定制版图设计流程,根据代工厂提供的设计规则及相应的设计规则文件进行设计。通过优化版图中的驱动能力、功耗、电流密度等,采用人工布局布线干预、地线隔离和通道隔离等方法,降低由大电流所引起的噪声和串扰。同时设计时采用了匹配设计,提高器件的稳定性。通过对设计过程中多种因素的考虑和关键问题的解决,大大降低了芯片流片的风险。通过对流片的芯片进行测试验证,芯片指标满足设计指标要求,符合用户的使用要求。产品的成功研制为负载均流控制模块和模拟混合信号电路核积累了宝贵的经验,同时也将解决目前市场上高精度低失配负载均流控制器稀缺的问题,为公司带来良好的经济利益。更多还原

【Abstract】 With the rapid development of informatization,a large number of communication devices,servers,workstations,etc.are widely used,which requires a safe and reliable large-capacity power system to provide uninterrupted power supply.If a single power supply is used,high requirements are placed on the output power and long-term reliability of the power supply,and once a failure occurs,the entire system will collapse.To achieve high power output,using multiple power modules in parallel is a development direction of power management technology.Load sharing controller,as a power control integrated circuit,has a wide range of applications in distributed power systems.By controlling multiple parallel power supply modules to achieve current sharing power supply,each power supply module only needs to output a balanced output with lower power,which improves the stability of the power supply system and solves the problems faced by a single power supply.This thesis proposes the design and implementation of a load current sharing controller based on the maximum current automatic current sharing method according to actual needs by researching and analyzing the current current sharing method.Combined with the user’s index requirements and the type of device used in the circuit,the chip in this subject is designed using the BCD technology.Comprehensive consideration from the aspects of circuit,layout,module and system makes better results in terms of accuracy,power dissipation,driving and speed,and finally achieves a high-precision load current sharing controller with low offset(offset voltage≤100μV)and low current sharing error(current sharing error≤5%).The thesis focuses on the in-depth discussion and research of the circuit module units and the overall layout of the circuit.The optimization design of the circuit,combined with the use requirements of the product and the ambient temperature for comprehensive simulation verification makes the circuit design meeting the user requirements.The layout design process adopts the fully customized layout design process of Cadence software,and is designed according to the design rules and corresponding design rule files provided by the foundry.By optimizing the driving capacity,power dissipation and current density in the layout,artificial layout and wiring intervention,grounding isolation and channel isolation are adopted to reduce the noiseand crosstalk caused by the large current.At the same time,the matching design is adopted to improve the stability of the device.The risk of chip tape-out is greatly reduced by the consideration of various factors in the design process and the resolution of key issues,and the chip index meets the design index requirements and meets the user’s use requirements by the test and verification of the tape-out chip in this thesis.The successful development of the product has accumulated valuable experience for the load current sharing control module and analog mixed signal circuit core,and will also solve the problem of the scarcity of high precision and low mismatch load current sharing controllers currently on the market,and will bring a good economy to the company interest.更多还原