FIELD: electricity.
SUBSTANCE: in a reserve power supply device there is a second resistor (10) and an optical coupler (12), a light radiator (12.1) of which is connected in series into a circuit of a voltage sensor (6), which is connected in parallel to the main source (1), and a photodetector of an optical coupler (12.2) shunts an emitter-basic transition of a transistor of n-p-n type (11), the base of which via the second resistor (10) is connected to the emitter of the transistor of p-n-p type (5).
EFFECT: reduced consumption in a redundancy mode, higher reliability of the device, simplified circuit solution.
2 dwg
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