UNINTERRUPTIBLE POWER SUPPLY Russian patent published in 2012 - IPC H02J9/06 

FIELD: electrical engineering.

SUBSTANCE: following items are introduced into the applied device: another n-p-n transistor (12) and a p-n-p transistor (11). The emitter of the second n-p-n transistor (12) is connected to the negative pole, its base is connected to the collector of the first n-p-n transistor (5), and its collector is connected through the third resistor (10) to the base of the first p-n-p transistor (11), whose collector is connected to the termination (3) and emitter connected to the positive pole of the backup power source (2) and the second capacitor (7) lead. The first lead of this capacitor (7) is connected to the cathode of the isolation diode (4).

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 in the redundancy mode.

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