Switching device with automatic charger. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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The diagram of the switching device with the charger is shown in the figure.
In the presence of mains voltage, contacts K1.1 and K1.2 connect the load to the network, contact K3.1 connects the battery to the charger. When the network fails, contacts K1.1 and K1.2 connect the load to the secondary winding of the transformer T1 of the voltage converter. Contacts K2.1 converter is connected to the battery.
Relay contacts K1 ... K4 must be rated for the appropriate current, since several relays will have to be connected in parallel.
The power part of the charger is made on the transformer T2, diodes VD1 ... VD4, switch SA1 and does not need comments. Automobile lamps HL1, HL2 (high beam - low beam) are used to stabilize the battery charging current.
Automatic control over the full charging and discharging of the battery is carried out by a two-threshold comparator on the DA1 chip. If one of the comparators is triggered, the K4 relay is triggered and disconnects the battery from the charger or from the voltage converter with its contacts.
To adjust the comparator, it is necessary to set the voltage to the middle of the operating range - 12 V, short-circuit the resistor R3 and, selecting the resistor R2, achieve switching of both comparators. Next, you need to remove the jumper from R3 and select this resistor to achieve switching of the comparator at voltages of 10 and 14 V.
Author: A. Mankovsky, Selidovo, Donetsk region.
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