基于二分法的DPWM模块设计与应用
发布时间：2019-05-30 08:29
【摘要】：电源管理芯片广泛应用于电子产品中,传统的电源管理IC主要采用模拟的控制方式来实现,但是模拟电源易老化,可移植性差,不易集成等缺点使得模拟电源在高端市场的应用受到了制约。数字电源以其高集成度,可移植性强和高精度等优点在更低的输出电压,更宽范围的负载以及各种电源同步管理等高端市场逐渐崭露头角。本文的研究就是针对数字电源来展开,众所周知,数字比例-积分-差分器(Digital Proportion Integral Differential,DPID)和数字脉宽调制器(Digital Pulse Width Modulator)是数字电源中两个最关键的模块,DPID用于对系统进行补偿,从而保证系统稳定,DPWM用于将表示占空比信息的DPID码转换成周期一定的方波信号。所以,有效的补偿网络和高精度、高线性度的DPWM对数字电源系统的稳定来说至关重要。本文创新的地方在于优化了DPID的Verilog代码,消除了传统DPID模块产生的毛刺,并且完成了从前端到后端的设计;另外,本文还提出了一种基于混合型数字脉宽调制器(HDPWM)的带延迟线二分法校准机制的新电路,该电路引入的二分算法对HDPWM中延迟线部分进行校准,保证延迟线中每相邻两个延迟单元的延迟信息相同,从而保证高精度的前提下能有效地提高DPWM的线性度。文中首先详细介绍了数字DC-DC变换器的设计方法学、基本原理以及离散域模型,然后介绍了DPID模块和DPWM模块从前端到后端的设计,最后仿真验证了DPWM的功能和数字电源的功能。对DPID模块和DPWM模块采用了全数字设计流程,借助Synopsys公司的EDA工具实现了系统时钟为32MHz的9-bit DPWM,该DPWM应用于开关频率为2MHz的数字DC-DC变换器。该DPWM模块在0.13μm CMOS工艺下实现,最大差分非线性(DNL)只有0.136LSB,积分非线性(INL)为0.15LSB。本文最终实现的数字DC-DC变换器输入电压范围为2.7V~4.2V,输出电压为0.7V~1.8V。
[Abstract]:Power management chip is widely used in electronic products. The traditional power management IC is mainly realized by analog control, but the analog power supply is easy to age and has poor portability. It is not easy to integrate and other shortcomings, so that the application of analog power supply in the high-end market is restricted. With its advantages of high integration, portability and high precision, digital power supply has gradually emerged in the high-end market, such as lower output voltage, wider range of load and various power supply synchronous management. The research in this paper is aimed at digital power supply. As we all know, digital proportional integral differential (Digital Proportion Integral Differential,DPID) and digital pulse width modulator (Digital Pulse Width Modulator) are the two most critical modules in digital power supply. DPID is used to compensate the system to ensure the stability of the system. DPWM is used to convert the DPID code representing duty cycle information into square wave signal with a certain period. Therefore, effective compensation network and high precision and high linearity DPWM are very important to the stability of digital power supply system. The innovation of this paper is to optimize the Verilog code of DPID, eliminate the burr produced by the traditional DPID module, and complete the design from the front to the back end. In addition, a new circuit with delay line dichotometry calibration mechanism based on hybrid digital pulse width modulator (HDPWM) is proposed in this paper. The dichotometry algorithm introduced in this circuit calibrates the delay line part of HDPWM. It is guaranteed that the delay information of each two adjacent delay units in the delay line is the same, so that the linearity of DPWM can be effectively improved under the premise of high precision. In this paper, the design methodology, basic principle and discrete domain model of digital DC-DC converter are introduced in detail, and then the design of DPID module and DPWM module from front to back end is introduced. Finally, the function of DPWM and the function of digital power supply are verified by simulation. The all-digital design flow is adopted for DPID module and DPWM module, and the 9-bit DPWM, with system clock 32MHz is realized with the help of EDA tool of Synopsys Company. The DPWM is applied to digital DC-DC converter with switching frequency 2MHz. The DPWM module is implemented in 0.13 渭 m CMOS process. The maximum differential nonlinear (DNL) is only 0.136LSB, and the integral nonlinear (INL) is 0.15LSB. The input voltage range of the digital DC-DC converter is 2.7 V 鈮，
本文编号：2488682
[Abstract]:Power management chip is widely used in electronic products. The traditional power management IC is mainly realized by analog control, but the analog power supply is easy to age and has poor portability. It is not easy to integrate and other shortcomings, so that the application of analog power supply in the high-end market is restricted. With its advantages of high integration, portability and high precision, digital power supply has gradually emerged in the high-end market, such as lower output voltage, wider range of load and various power supply synchronous management. The research in this paper is aimed at digital power supply. As we all know, digital proportional integral differential (Digital Proportion Integral Differential,DPID) and digital pulse width modulator (Digital Pulse Width Modulator) are the two most critical modules in digital power supply. DPID is used to compensate the system to ensure the stability of the system. DPWM is used to convert the DPID code representing duty cycle information into square wave signal with a certain period. Therefore, effective compensation network and high precision and high linearity DPWM are very important to the stability of digital power supply system. The innovation of this paper is to optimize the Verilog code of DPID, eliminate the burr produced by the traditional DPID module, and complete the design from the front to the back end. In addition, a new circuit with delay line dichotometry calibration mechanism based on hybrid digital pulse width modulator (HDPWM) is proposed in this paper. The dichotometry algorithm introduced in this circuit calibrates the delay line part of HDPWM. It is guaranteed that the delay information of each two adjacent delay units in the delay line is the same, so that the linearity of DPWM can be effectively improved under the premise of high precision. In this paper, the design methodology, basic principle and discrete domain model of digital DC-DC converter are introduced in detail, and then the design of DPID module and DPWM module from front to back end is introduced. Finally, the function of DPWM and the function of digital power supply are verified by simulation. The all-digital design flow is adopted for DPID module and DPWM module, and the 9-bit DPWM, with system clock 32MHz is realized with the help of EDA tool of Synopsys Company. The DPWM is applied to digital DC-DC converter with switching frequency 2MHz. The DPWM module is implemented in 0.13 渭 m CMOS process. The maximum differential nonlinear (DNL) is only 0.136LSB, and the integral nonlinear (INL) is 0.15LSB. The input voltage range of the digital DC-DC converter is 2.7 V 鈮，
本文编号：2488682
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