Linux2.6内核中的最新电源管理技术综述
通过以上的介绍,大家对如何使用 cpufreq 通过 sysfs 提供的用户接口已经有了大致的了解,但是对于绝大部分用户而言,逐一操作这些文件既费力又耗时。因此 Dominik 等人开发了cpufrequtils 工具包[2],为用户提供了更加简便的对内核cpufreq 子系统的操作接口。通过 cpufreq-info 的输出,读者可以很清楚的看到刚刚在上面介绍过的/sys/devices/system/cpu/cpuX/cpufreq/ 目录下各个文件的内容。
$ cpufreq-info
cpufrequtils 002: cpufreq-info (C) Dominik Brodowski
2004-2006
Report errors and bugs to linux@brodo.de, please.
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which need to switch frequency at the same time:
0 1
hardware limits: 1000 MHz - 1.67 GHz
available frequency steps: 1.67 GHz, 1.33 GHz, 1000
MHz
available cpufreq governors: userspace, conservative,
ondemand, powersave, performance
current policy: frequency should be within 1000 MHz
and 1.67 GHz.
The governor “ondemand” may decide which
speed to use
within this range.
current CPU frequency is 1000 MHz.
analyzing CPU 1:
driver: acpi-cpufreq
CPUs which need to switch frequency at the same time:
0 1
hardware limits: 1000 MHz - 1.67 GHz
available frequency steps: 1.67 GHz, 1.33 GHz, 1000
MHz
available cpufreq governors: userspace, conservative,
ondemand, powersave, performance
current policy: frequency should be within 1000 MHz
and 1.67 GHz.
The governor “ondemand” may decide which
speed to use
within this range.
current CPU frequency is 1000 MHz.大电流电感
能量收集型传感器节点实现方案
虽然能量收集并不是一个全新概念,但是RF和微控制器(MCU)器件在性能与能耗方面取得的最新进展,意味着构建一个采用能量收集型应用,例如传感器节点,现在变得更加容易。此外
请教3842做的电源,低压带载正常,高压通电烧MOS问 请教各位高手,我现在做的一款24V/4.5A的开关电源,以前生产300个偶尔会烧一两个MOS,这一批次忽然比例达到25%,电路图是这样的:
现在的情况是:在110V下空载、满载测