UNINTERRUPTIBLE POWER SUPPLY FOR DIRECT CURRENT CONSUMER Russian patent published in 2012 - IPC H02J9/06 G05F1/585 

FIELD: electrical engineering.

SUBSTANCE: invention includes the insertion of the following items into the applied device: a p-n-p transistor, another n-p-n transistor. In addition, the emitter of the second n-p-n transistor is connected to the negative pole, its base is connected to the collector of the first n-p-n transistor, and its collector is connected through the third resistor to the base of the p-n-p transistor. The collector of the p-n-p transistor is connected to the cathode of the isolation diode, and its emitter is connected to the positive pole of the backup power source, while the second terminal of the second resistor is connected to the base of the second n-p-n transistor.

EFFECT: use in power supply of communication devices and other important consumers, increasing the device's reliability while simplifying its design and reducing its energy consumption from the primary power source.

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