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制作一个晶体管直流稳压电源,总希望它的温度漂移要小,即温度系数要小。温度系数K_T=△V_0/△T|△V_S=0 △I_o=0。如果它的温度系数很大,那么稳压系数再小也没有多大意义。对于一般用途的中等精度的稳压电源,当输入电压V_S变化+10％和-15％时,引起输出电压V_o变化△V_o′,与环境温度每变化10℃所引起的输出电压的变化△V_o大致相当,可以认为是适宜的。输出电压之所以会随温度的变化而漂移,主要原因是比较放大器的晶体管参数随温度的漂移,基准电压随温度的漂移,以及取样电阻的影响等。为了减小温度系数,常
Make a transistor DC power supply, the total hope that its temperature drift should be small, that is, the temperature coefficient should be small. Temperature coefficient K_T = ΔV_0 / ΔT | ΔV_S = 0 ΔI_o = 0. If its temperature coefficient is large, then the regulator factor is not much significance. For general-purpose medium-precision regulated power supply, when the input voltage V_S changes by + 10% and -15%, the output voltage V_o changes by ΔV_o ’, and the change of the output voltage by every 10 ° C change with ambient temperature ΔV_o Roughly equivalent, can be considered appropriate. The reason why the output voltage drift with temperature changes, the main reason is to compare the amplifier transistor parameters with the temperature drift, the reference voltage with the temperature drift, and the impact of sampling resistance and so on. In order to reduce the temperature coefficient, often