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Design of a High-precision DC regulated power supply system

机译：高精度直流稳压电源系统的设计

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DC regulated power supplies are widely used in teaching, scientific research, industrial production and other fields. The accuracy of the power supply in the automatic test system will affect the quality of the test results. In order to design a high-precision DC regulated power supplies, based on closed-loop negative feedback and self-calibration technology, we use four-wire Kelvin sense and fuzzy adaptive PID control algorithm to improve the accuracy of the output's power, while floating output method has also been used to simplify the design. A microcomputer has been used to control a DAC which outputs a analog voltage to drive a power amplifier, in this way, the power amplifier could output a adjustable voltage with continuously. At the same time, a ADC has been used to sample the amplifier's output and send the sample value to the microcomputer for negative feedback control. A power dissipation control circuit has been designed based on the junction temperature characteristics of the power amplifier to improve power conversion efficiency and accuracy. The experiment test results show that the designed power supply's output voltage range is 0 ~ ±30V, accuracy is ± ( 0.25% * U±10mV), current range is 0 ~ ±6A, accuracy is ± ( 0.2% * I±5mA), maximum power is 65W, which meets the expectations target.
机译：直流稳压电源广泛用于教学，科研，工业生产等领域。自动测试系统中电源的准确性会影响测试结果的质量。为了设计高精度的直流稳压电源，基于闭环负反馈和自校准技术，我们使用四线开尔文感测和模糊自适应PID控制算法来提高输出电源的精度，同时浮动输出方法也已用于简化设计。微型计算机已用于控制DAC，该DAC输出模拟电压以驱动功率放大器，这样，功率放大器可以连续输出可调电压。同时，ADC已用于对放大器的输出进行采样，并将采样值发送至微计算机以进行负反馈控制。已基于功率放大器的结温特性设计了功耗控制电路，以提高功率转换效率和精度。实验测试结果表明，设计电源的输出电压范围为0〜±30V，精度为±（0.25％* U±10mV），电流范围为0〜±6A，精度为±（0.2％* I±5mA） ，最大功率为65W，符合预期目标。

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