探索低压电路功耗相对较好的原因(精选).doc

探索低压电路功耗相对较好的原因 CPU的温升取决于两大方面，一个方面是CPU工作不断产生的热量累积；另一个方面是对CPU产生的热量的导散。热量增加和散热不畅都会导致CPU的温度上升，并造成对CPU的损伤。 CPU的热量来源于它的功耗，根据CPU功耗与供电电压和工作频率的关系可以看到供电电压和工作频率是影响CPU温升的两个重要因素。 CPU temperature depends on two aspects, one aspect is the heat generated by the CPU working constantly accumulation; Another aspect is the CPU heat conductivity are scattered. Increased heat and cooling leads to the CPU temperature rise, and cause damage in the CPU. CPU heat from its power consumption, according to the CPU power consumption and power supply voltage and working frequency relationship as you can see the power supply voltage and frequency are the two important factors that affect the CPU temperature rise. CMOS电路CPU的动态功耗为P = CV2f，其中C表示电路负载大小，V表示供电电压，f为工作频率。可见工作频率f与芯片的动态功耗成线性正比例关系，供电电压V的平方与芯片的动态功耗成线性正比例关系，对于一颗CPU来说，电压越高，时钟频率越快，则功率消耗越大。因此，在能够满足功能正常的前提下，尽可能选择低电压工作的CPU能够在总体功耗方面得到较好的效果。对于已经选定的CPU来讲，降低供电电压和工作频率，也是一条节省功率的可行之路。 Dynamic power consumption CMOS circuit CPU for P = CV2f, C represents the load size electric circuit, V power supply voltage, frequency f work. Visible work frequency f and the dynamic power consumption chip into linear direct ratio relation, power supply voltage V squared and linearly direct proportion relationship between the dynamic power consumption of the chip, for a CPU, the higher the voltage, the faster the clock frequency, the power consumption. Therefore, under the premise that can satisfy the function is normal, as far as possible choose low voltage CPU can get good effect in the aspect of the overall power consumption. For the selected CPU, lower power supply voltage and working frequency, is also a way to save power. 3　CPU的温控技术 3 the CPU temperature control technology 3.1　外部温度监控技术 3.1 outside temperature monitoring technology 对CPU温度监控通过“外部监测”措施—即通过主板CPU插座下面的热敏电阻来监测CPU工作时的温度。CPU插座内采用立式或贴片式的热敏电阻。整个监测过程全部是由主板来负责，热敏电阻直接将所监测到的数据传给主板上的温控电路，如果监测到CPU的工作温度超过在BIOS中的预设值时就会自动断电关机或报警。采用此种方式的优点是体积小、价格低，使用方便，不过在监控处理器温度时明显存在缺陷，比如用此类监测方式得到的温度往往是CPU底面的温度