In this work, the design and development of a new variable linear power supply, using the LM317 regulator, is proposed. The originality of this power supply is related with the control of the rectifier circuit, which is based on a reference of voltage, superimposed on the output voltage. This reference is used in the control strategy to maintain a constant voltage between the input and the output voltages of the LM317 regulator. Due to this strategy, the heating losses are greatly reduced, allowing to increase the efficiency of the regulator to about 90%, and to reduce the requirements of the cooling system. Moreover, drawbacks of conventional power supplies are mitigated, where the developed variable linear power supply delivers a current of 3 A and a variable output voltage, from 1.2 V to 30 V. The LM317 regulator was modeled by its thermal equivalent structure associated with a heatsink to study the heat transfer problem. The modeling was performed on the Matlab Simulink software, and the theoretical results were validated by a set of experimental tests using the LM317 regulator.

在这项工作中，提出了使用LM317稳压器的新型可变线性电源的设计和开发。该电源的独创性与整流电路的控制有关，该整流电路基于叠加在输出电压上的参考电压。在控制策略中使用该参考来保持LM317稳压器的输入和输出电压之间的恒定电压。由于这种策略，大大减少了加热损失，从而将调节器的效率提高到大约90％，并降低了冷却系统的要求。而且，减轻了常规电源的缺点，其中开发的可变线性电源提供3 A的电流和1.2 V至30 V的可变输出电压。LM317调节器通过与散热器相关的等效结构进行建模，以研究传热问题。在Matlab Simulink软件上进行了建模，并使用LM317调节器通过一组实验测试验证了理论结果。