Technology Changes: From a Por
abstract: portable power presents a range of design challenges. while major changes such as new battery technologies make headlines, the minor, almost negligible shifts are arguably more fascinating. the effects of these shifts is often non-linear µ a small change triggers a big change! major shifts like this happen when battery technologies, dropping system voltages, new rf and display components, and, of course, power conversion advances, all interact.
portable power presents a range of design challenges. while major changes such as new battery technologies make headlines, the minor, almost negligible shifts are arguably more fascinating. the effects of these shifts is often non-linear - a small change triggers a big change!
for instance, cellular phones used to require boost converters to power the rf power amp. the pa needed 5v but with only three cells in the battery pack, a boost converter was essential. as pa operating voltages dropped, the boost was no longer required and linear regulators came into play. now, dsp voltage drops will likely motivate a return to dc-dc converters — but in step-down mode, rather than step-up.
just a few tenths of a volt triggered wholesale changes in power supply architecture!
major shifts like this happen when battery technologies, dropping system voltages, new rf and display components, and, of course, power conversion advances, all interact. what sorts of changes are likely to impact the future? fuel cells with operating voltages down to 0.5v may bring boost converters back again. or a new battery chemistry, with a different voltage profile, may requires something completely different. size does matterit's a safe bet that inside portable devices, we'll see more power conversion in smaller spaces, but not entirely due to semiconductor advances. passive components, which historically lag ics, are shrinking quite ably —ceramic caps and small magnetics in particular. now, with higher speed power converters, several watts can be handled by only a few cubic mm of magnetic material. in some power supplies, you can't tell the inductors from the ceramic capacitors! in the short term and beyond, this will reduce designer resistance to magnetic components and put compact, highly efficient power conversion in a wider range of devices. displaysin many ways, displays, and the power they consume, drive consumer technology. display power is a specialty. in many products, the viewing experience will remain the source of product obsolescence. this will continue until screens match the ultimate display technology - paper! screens have yet to match paper for resolution, weight, and power consumption.
new display technologies like oled may change power management because they use no backlight. even a less dramatic step, like using white leds rather than ccfl backlights, greatly simplifies power management. white leds have supplanted el backlights and ccfls in small lcds (phones and pdas) because led drive circuitry is far simpler. a wide range of drive schemes can power white leds, including charge pump ics, inductor-based converters, and even linear regulators. simple (but less efficient) linear regulation's cost advantage will keep it in the fray.
will white leds win their way into notebooks? it's the classic battle - a mature, but awkward, technology (ccfls use fragile glass tubes and very high voltages) battling against a new one that is just emerging as mainstream. the results are inevitable, but the timing can be hard to predict. just see how crts have hung tough for 70 or more years and the long-predicted demise of the hard drive in favor of solid state technologies seems farther and farther away.
the enabling technology for white leds may have nothing to do with leds - or any other semiconductor for that matter. as in the graduate, the watchword is plastics! once an optical diffuser can convert an led point source to an even backlight, the battle will be won. expect then to see a single led illuminate a 12(or larger) lcd.
diffuser technology is not new to solving problems like this. advances in optical plastics over several years helped drive notebook display power consumption from typically 5 watts to well under 2 watts. that's a big improvement for a piece of plastic, and dwarfs efficiency advances achieved by ccfl inverters over the same time. powerful technologies, powerful designsone thing is for sure: the days are long gone when a 9 volt battery and a 5v linear regulator complete the power supply work. every change creates job security for the good power supply designer!
智能手机“钟情”的卫星通信，到底有何魅力？
防汛还得靠中国制造 北斗技术2025年产值将达一万亿
罗森伯格推出了新型的光纤LC快速插拔连接器
聚焦边缘AI，GreenWaves携超低功耗GAP处理器亮相2021慕尼黑上海电子展
TCL X10洗衣机正式发布 采用无门封设计结合水封舱结构可实现100%全免污
Technology Changes: From a Por
长途漫游费将被淘汰 运营商蕴量未来通信服务
制造企业的数字化转型的案例分享
进击的物联网，前移的安全关
电容的原理是什么？电容是如何进行储电的？
发力64位处理器芯片，苹果又领先一步？
通过车规级认证的MCU国产公司盘点
iPadPro2020款和2018款对比评测_外观/配置/摄像头/价格
一种测量压应力和折射率的超短光纤实验室传感器
飞利浦推出搭载AI人工智能的电视，追求极致纤薄
Intel：Win7优于XP SP3 将升级10万台PC
语音识别模块在水晶吸顶灯中的应用
华为构建EC-IoT生态助力行业数字化转型
山寨本市场风云突变 外销市场跌幅过半
日本砸120亿日元打造21世纪物联网智慧校园
portable power presents a range of design challenges. while major changes such as new battery technologies make headlines, the minor, almost negligible shifts are arguably more fascinating. the effects of these shifts is often non-linear - a small change triggers a big change!
for instance, cellular phones used to require boost converters to power the rf power amp. the pa needed 5v but with only three cells in the battery pack, a boost converter was essential. as pa operating voltages dropped, the boost was no longer required and linear regulators came into play. now, dsp voltage drops will likely motivate a return to dc-dc converters — but in step-down mode, rather than step-up.
just a few tenths of a volt triggered wholesale changes in power supply architecture!
major shifts like this happen when battery technologies, dropping system voltages, new rf and display components, and, of course, power conversion advances, all interact. what sorts of changes are likely to impact the future? fuel cells with operating voltages down to 0.5v may bring boost converters back again. or a new battery chemistry, with a different voltage profile, may requires something completely different. size does matterit's a safe bet that inside portable devices, we'll see more power conversion in smaller spaces, but not entirely due to semiconductor advances. passive components, which historically lag ics, are shrinking quite ably —ceramic caps and small magnetics in particular. now, with higher speed power converters, several watts can be handled by only a few cubic mm of magnetic material. in some power supplies, you can't tell the inductors from the ceramic capacitors! in the short term and beyond, this will reduce designer resistance to magnetic components and put compact, highly efficient power conversion in a wider range of devices. displaysin many ways, displays, and the power they consume, drive consumer technology. display power is a specialty. in many products, the viewing experience will remain the source of product obsolescence. this will continue until screens match the ultimate display technology - paper! screens have yet to match paper for resolution, weight, and power consumption.
new display technologies like oled may change power management because they use no backlight. even a less dramatic step, like using white leds rather than ccfl backlights, greatly simplifies power management. white leds have supplanted el backlights and ccfls in small lcds (phones and pdas) because led drive circuitry is far simpler. a wide range of drive schemes can power white leds, including charge pump ics, inductor-based converters, and even linear regulators. simple (but less efficient) linear regulation's cost advantage will keep it in the fray.
will white leds win their way into notebooks? it's the classic battle - a mature, but awkward, technology (ccfls use fragile glass tubes and very high voltages) battling against a new one that is just emerging as mainstream. the results are inevitable, but the timing can be hard to predict. just see how crts have hung tough for 70 or more years and the long-predicted demise of the hard drive in favor of solid state technologies seems farther and farther away.
the enabling technology for white leds may have nothing to do with leds - or any other semiconductor for that matter. as in the graduate, the watchword is plastics! once an optical diffuser can convert an led point source to an even backlight, the battle will be won. expect then to see a single led illuminate a 12(or larger) lcd.
diffuser technology is not new to solving problems like this. advances in optical plastics over several years helped drive notebook display power consumption from typically 5 watts to well under 2 watts. that's a big improvement for a piece of plastic, and dwarfs efficiency advances achieved by ccfl inverters over the same time. powerful technologies, powerful designsone thing is for sure: the days are long gone when a 9 volt battery and a 5v linear regulator complete the power supply work. every change creates job security for the good power supply designer!
智能手机“钟情”的卫星通信，到底有何魅力？
防汛还得靠中国制造 北斗技术2025年产值将达一万亿
罗森伯格推出了新型的光纤LC快速插拔连接器
聚焦边缘AI，GreenWaves携超低功耗GAP处理器亮相2021慕尼黑上海电子展
TCL X10洗衣机正式发布 采用无门封设计结合水封舱结构可实现100%全免污
Technology Changes: From a Por
长途漫游费将被淘汰 运营商蕴量未来通信服务
制造企业的数字化转型的案例分享
进击的物联网，前移的安全关
电容的原理是什么？电容是如何进行储电的？
发力64位处理器芯片，苹果又领先一步？
通过车规级认证的MCU国产公司盘点
iPadPro2020款和2018款对比评测_外观/配置/摄像头/价格
一种测量压应力和折射率的超短光纤实验室传感器
飞利浦推出搭载AI人工智能的电视，追求极致纤薄
Intel：Win7优于XP SP3 将升级10万台PC
语音识别模块在水晶吸顶灯中的应用
华为构建EC-IoT生态助力行业数字化转型
山寨本市场风云突变 外销市场跌幅过半
日本砸120亿日元打造21世纪物联网智慧校园