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本文从反馈放大器的角度分析了采用运算放大器的串联型稳压电源的工作原理。特别指明了电源的稳定度、漂移、纹波、噪声等性能,基本上由运算放大器和基准电压稳压管的性能所决定。并从数学上给出了它们的关系式。实验电源中包括一级有源滤波器,它放在串联稳压级和整流滤波电路之间。在结构上采取了多种屏蔽,注意了排板和接地,为充分发挥电路特点提供了条件。我们利用现有设备,解决了微伏量级纹波的测试。该电源输出电压为12V,当输出电源在0—500mA变化时,测得纹波峰—峰值优于5μV,与理论计算结果相符合。
This article from the perspective of feedback amplifier analysis using the operational amplifier series power supply of the working principle. Specially pointed out the power stability, drift, ripple, noise and other performance, basically by the op amp and reference voltage regulator tube performance decision. And mathematically given their relationship. The experimental power supply includes an active filter, which is placed between the series regulator and the rectifier filter circuit. In the structure to take a variety of shielding, pay attention to the row of plates and ground, in order to give full play to the characteristics of the circuit provided the conditions. We use existing equipment to solve the test of microvolt level ripple. The power output voltage of 12V, when the output power changes in the 0-500mA, the measured peak ripple - peak better than 5μV, consistent with the theoretical calculations.