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分析了小功率矿用直流稳压电源普遍存在的效率低的原因，提出提高效率的方法，阐明限幅开关工作原理和实现方法及应用中要注意的问题。
The reasons for the low efficiency of low power mining DC power supplies are analyzed. The methods to improve the efficiency are put forward. The working principle of the limit switches and the methods to be used in the implementation of the limit switches and the problems to be noticed in the application are explained.