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设计一款高能效的VR头盔,你有多少把握?
2018年9月9日
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作者:Christine Young Maxim Integrated博主 |
虚拟现实 (VR) 能够让您从舒适的客厅到走向千里之外,而增强现实 (AR) 使游戏变得更具互动性(老实讲,您是否曾经沉溺过Pokemon GO ?)。然而,这些丰富多彩、身临其境的体验带来的问题之一是设备的电池寿命有限。市场上主流的头盔都号称每次充电可供使用一到两个小时,然而这点时间几乎都不够看完一部电影。如果与家人共用头盔的话,但愿下一位用户能有耐心等待设备充电几个小时。
VR/AR头盔的电源挑战是许多计算密集型、始终在线移动电子设备面临的常见难题。想一下智能家居集线器、机顶盒、游戏系统以及上网本,此类应用越来越多地依赖于多核CPU、APU、GPU、人工神经网络加速器和机器视觉算法——全部集成在尺寸紧凑的外壳中。由于设备非常小巧,电池必须随之调整。因此,随着此类应用中计算能力的增强,设计者将面临如下挑战:
- 最大程度提高每瓦功率的性能
- 提高系统效率
- 减小电路板空间
VR头盔是能够受益于高度集成PMIC的计算密集型应用的典型案例
PMIC重拳出击
Maxim的高集成度电源管理IC (PMIC) 为计算密集型应用提供高性能支持,此类应用中的空间限制、元件成本、高效、高运算能力、电源排序和鲁棒性都非常重要。该产品线的两款最新PMIC分别是:
- MAX77752多通道集成式PMIC,器件具有四个调节器 (3个降压型转换器和1个150mA低压差线性调节器 (LDO) ),3.6VIN、1.8VOUT时的峰值效率高于90% ,负载电流为3A,具有3路GPIO可支持外部调节器,采用70mm2、40引脚TQFN封装。浪涌限流器确保热插拔期间的稳定性,灵活的电源排序器允许硬件或软件控制上电。
- MAX77714完备系统PMIC,器件具有13个调节器 (4个降压型转换器和9个LDO),3.6VIN、1.1VOUT时的峰值效率高于90%,具有8路GPIO,采用230mm2、70焊球WLP封装。器件具有I2C兼容接口、灵活的电源排序器,休眠模式下的静态电流低至85µA。
"当前的技术专家正在推动AR、虚拟助理、实时深度学习等领域的独特创新。这就需要缩小外形尺寸,并且采用多核CPU、GPU、人工神经网络加速器和机器视觉算法。与此同时,企业正在竭力加速产品上市时间,所以这种快速整合带来了新的挑战,而标准的、分立式的方案无法解决这些问题。"Maxim移动电源事业部业务总监Karthi Gopalan表示:"Maxim最新的PMIC通过可扩展和可配置的资源进行优化,可为最快的移动处理器供电。这些器件在不牺牲电源效率的前提下实现游戏级性能,非常适合用于不断扩展的AI驱动消费场景和工业IoT应用。"
最终用户希望其电子设备每次充电都能够运行较长时间,且温度较低。在单芯片方案中,Maxim的高性能PMIC提供完备的电源管理能力,支持应用处理器工作在最高性能状态,提供稳定、高品质用户体验。