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在电源输入功率不大的情况下,可以只用一只中间继电器就能实现双路供电的自动倒换。这种电路有线路简单,造价低、便于维护
In the power input power is not big case, you can only use an intermediate relay will be able to achieve dual automatic switching power supply. This circuit has a simple line, low cost, easy to maintain