AON power supply. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Telephony
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In some power sources for telephones with caller ID, there is one drawback - when the battery is discharged, it does not turn off. In this case, the normal operation of the power supply stabilizer is impossible due to the low voltage at its input. The phone turns on and off periodically, which can lead to undesirable consequences. A very simple power source is proposed, devoid of this disadvantage, namely, when the voltage on the battery drops below 6.5 (the minimum voltage at which the stabilizer is operational), it turns off. The diagram of the device is shown in the figure.
When the power supply is connected to the network, relay K1 is activated, which is the battery discharge sensor (the hysteresis of the relay is used). A charging current of 2 ... 5 mA flows through the resistor R10. When the mains voltage fails, the VD2 diode opens and the power comes from the GB1 battery. If the voltage on it drops below 6.5 V, the relay will release and contacts K1.1 will disconnect the battery.
The storage battery consists of six D-0.55 cells connected in series. A fully charged battery will keep your phone running for up to an hour, which is sufficient during brief power outages.
The relay is used brand RES-64A (passport RS4.569.724).
Establishing the device is reduced to the selection of the resistor R1, which sets the release voltage of the relay K1, and the selection of the resistor R2 - they set the charging current of the battery GB1.
To keep the GB1 battery in a charged state, a current of about 200 μA is sufficient. The specified current of 5...10 mA can cause the battery to overcharge.
Publication: N. Bolshakov, rf.atnn.ru
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