虹膜识别系统中的电源设计与实现

Design and Implementation of Power Supply in Iris Recognition System

在虹膜识别硬件电路系统中,各个芯片都需要系统为其提供相应的电源,因此必须设计与系统电路相匹配的电源系统。在本设计硬件系统中,系统电路包含数字电路与模拟电路两部分,为提高数模转换精度,并且大幅度减少视频的噪声,需要分别对系统两部分电路进行供电。对数字电路部分设计电源,选择用两片TPS54310芯片来产生DSP的内核电压1.4 V和外围电压3.3 V。模拟部分3.3 V电压,采用LDO电压芯片TPS76833实现供电。完成相关元器件的选择、电路参数的计算和设计以及电路硬件的安装和调试,最终实现稳定的、高精度的符合电压等级需求的电源。

In the iris recognition hardware circuit system,each chip needs the system to provide corresponding power supply,so it is necessary to design a power supply system that matches the system circuit.In the hardware system designed in this paper,the system circuit includes two parts:digital circuit and analog circuit.In order to improve the accuracy of digital-to-analog conversion and greatly reduce the noise of the video,we need to supply power to the two parts of the system separately.Design the power supply for the digital circuit,and choose two TPS54310 chips to generate the core voltage of the DSP 1.4 V and peripheral voltage 3.3 V.Analog part 3.3 V voltage,using LDO voltage chip TPS76833 to achieve power supply.Complete the selection of related components,circuit parameter calculation and design,circuit hardware installation and debugging,and finally achieve a stable,high-precision power supply that meets the voltage level requirements.