A method and device for backfeed protection of uninterruptible power supply ups circuit and ups
A circuit and power supply technology, applied in the field of uninterruptible power supply, can solve problems such as reducing system design costs, achieve the effect of reducing design costs and reducing the difficulty of device selection
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[0029] Embodiments of the present application will be described below in conjunction with the accompanying drawings. It should be understood that the embodiments described here are only used to illustrate and explain the present application, and are not intended to limit the present application.
[0030] In view of the traditional mechanical backfeed protection in the prior art, it is necessary to select a backfeed protection device with a distance requirement, and there is a problem that the selection of the device is difficult and the system design cost is high. The embodiment of the present invention provides a UPS circuit Backfeed protection scheme. In this scheme, by collecting the input voltage at the AC input port of the UPS, it is determined that the input voltage is a DC voltage, and the input voltage value is greater than the preset threshold. connected relays, so as to cut off the input of the battery components, avoiding the danger of electric shock caused by the op...
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