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一般串联调整式稳压电源,调整管管压降6V～10V才能稳压输出,因而调整管功耗大,效率低。图1所示是低功耗稳压电源电路,当调整管管压降为1.5V,电源仍然稳压输出,输出纹波电压也符合要求。因而大大减小了调整管的功耗,提高了电源的效率。当调整管管压降为1V,电源仍然稳压输出,但输出纹波电压很大,所以调整管最小管压降要选择1.5V以上为好。该电源的稳压原理如下:
General series regulated power supply, adjust the tube pressure drop 6V ~ 10V to regulate the output, and thus adjust the tube power consumption, low efficiency. Figure 1 shows the low-power power supply regulator circuit, when the regulator tube pressure drop is 1.5V, the power supply is still regulated output, the output ripple voltage also meets the requirements. Therefore, the power consumption of the adjusting tube is greatly reduced, and the power efficiency is improved. When adjusting the tube pressure drop to 1V, the power supply is still regulated output, but the output ripple voltage is very large, so adjust the tube minimum tube pressure drop to choose 1.5V above as well. The power regulator principle is as follows: