一款AC-DC电源管理芯片及系统的温度特性分析与设计

发布时间：2018-05-12 21:18

本文选题：基准电压 + 基准电流　；参考：《电子科技大学》2014年硕士论文

【摘要】：污染问题越来越严重,全国多数城市笼罩在雾霾之下,这种背景对能源的利用效率提出新的挑战。在电源技术发展的历程中,首先出现的是线性稳压器,这种电源的致命弱点是效率低下,不适应现代对能源高利用率的要求,因此开关电源技术被发明。开关电源技术已经被应用在了许多领域,比如消费电子、工业控制、航天。通过阅读大量文献,总结出开关电源技术未来发展的趋势是高效率、低功耗、小型化、高频化、高可靠性、数字化、低噪声、高抑制EMI。开关电源技术对现代能源利用率的提高是显而易见的。本文设计了一款开关电源控制芯片,该芯片的特点是在重载和轻载条件都较的高效率。控制芯片还有非常复杂的多种工作模式,结合了PWM、PFM、PSM三种调制模式,最大限度的减少功率管的损耗,包括动态和静态损耗,提高电源的效率。采用台积电的模拟、数字、VDMOS混合BCD工艺,将一颗耐高压到达700V左右的功率管集成在控制芯片里面,以此提高电路的稳定性和降低成本。芯片还设计了多种保护电路,包括输入欠压、过压、输出过压、温度保护。本文的主要工作是分析基准电压源、电流源、芯片外部可编程流限模块的温度特性,并设计出具体电路。基准电压源、电流源为整个芯片其它模块的提供参考电压和参考电流,因此对基准电路的设计要求特别严苛,要求基准电压源、电流源与工艺参数和温度无关。因此要设计一款低温度系数的基准,必须对工艺、器件的问题特性进行分析,然后才能设计符合要求的电路。可编程流限模块对功率管起限流作用,防止功率管电流过大发热而被烧毁。功率管是整个芯片的主要发热元件,温差比较大,在设计可编程流限模块电路尤其要考虑温度对电路的影响,设计出对温度不敏感的可编程流限模块电路。本文还做了版图设计相关的工作,具体分析了版图布局和一些其它需要注意的问题。完成电路设计后,对相应的电路模块进行了仿真,基准电压源温度系数可达17ppm,电流源温度系数在典型的TT工艺角下可达50ppm,可编程流限模块功能正常,在不同温度条件下流限值偏差在可接受范围内。文章最后对通过设计一个反激拓扑开关电流源电路对芯片进行了仿真、验证。流片后,对芯片进行初步测试,通过分析芯片的测试结果,芯片的功能正常,基本参数达到设计预期要求。
[Abstract]:The pollution problem is becoming more and more serious, and most cities in China are covered by haze, which poses a new challenge to the efficiency of energy use. In the course of the development of power supply technology, the first is linear voltage regulator. The fatal weakness of this kind of power supply is low efficiency, which can not meet the requirements of modern energy utilization, so switching power supply technology has been invented. Switching power technology has been used in many fields, such as consumer electronics, industrial control, aerospace. By reading a large number of literatures, it is concluded that the trend of the future development of switching power supply technology is high efficiency, low power consumption, miniaturization, high frequency, high reliability, digitalization, low noise, and high suppression of EMIs. Switching power supply technology is obvious to improve the efficiency of modern energy. In this paper, a switching power supply control chip is designed, which is characterized by high efficiency in heavy load and light load conditions. The control chip also has a lot of complex operation modes. It combines three modulation modes of PWMU PFMU PSM to minimize the loss of power transistor, including dynamic and static loss, and to improve the efficiency of power supply. By using TSMC analog and digital VDMOS hybrid BCD process, a power transistor with high voltage resistance up to 700V is integrated into the control chip to improve the stability of the circuit and reduce the cost. The chip also designed a variety of protection circuits, including input undervoltage, overvoltage, output overvoltage, temperature protection. The main work of this paper is to analyze the temperature characteristics of the reference voltage source, current source and programmable flow limit module outside the chip, and to design the specific circuit. The reference voltage source and current source provide the reference voltage and reference current for the other modules of the whole chip, so the design of the reference circuit is particularly demanding, and the reference voltage source is required. The current source is independent of the process parameters and temperature. Therefore, in order to design a low temperature coefficient reference, it is necessary to analyze the problem characteristics of the process and device before designing a circuit that meets the requirements. The programmable flow limiting module can limit the current of the power tube and prevent the power tube current from burning out. The power tube is the main heating element of the whole chip, and the temperature difference is relatively large. In designing the programmable flow limit module circuit, the influence of temperature on the circuit should be considered, and the programmable flow limit module circuit which is not sensitive to temperature is designed. The layout and some other problems needing attention are also analyzed in this paper. After the circuit design is finished, the corresponding circuit modules are simulated. The reference voltage source temperature coefficient can reach 17ppm, the current source temperature coefficient can reach 50ppm under typical TT process angle, and the programmable flow limit module has normal function. The flow limit deviation is within the acceptable range under different temperature conditions. Finally, the chip is simulated and verified by designing a flyback topology switch current source circuit. After the chip flow, the chip is preliminarily tested. By analyzing the test results of the chip, the function of the chip is normal and the basic parameters are up to the expected design requirements.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN86

【参考文献】