| 摘要 |
FIELD: electrical engineering. ^ SUBSTANCE: applied device, which comprises primary power source (1), backup power source (2), termination (3), isolation diode (4), p-n-p transistor (5), first resistor (6), second resistor (9), third resistors (11), first Zener diode (7), second Zener diode (10), opto-isolator (8) is modified by the introduction of a p-n-p transistor (12), whose collector is connected to the termination, the emitter is connected to the positive pole of the backup power source and the base is connected to the second photoresistor terminal (8.1) of the opto-isolator (8). Furthermore, the connection point of the second Zener diode (10) anodes and the opto-isolator's light emitter (8.2) is connected to the collector of the first transistor (5). In addition, the second resistor (9), the second Zener diode (10) and the opto-isolator's (8) light emitter (8.2) are in a series circuit, and, in their turn, are connected in parallel to the backup power source (2). ^ 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. ^ 2 dwg |
