Sub-phone telephone uninterruptible power supply circuit diagram introduction

The following is an introduction and description of the uninterruptible power supply circuit diagram of the sub-phone:
The principle of the uninterruptible power supply circuit is as follows: When the mains is out of power or an unexpected power failure occurs, the light source H is extinguished immediately, and the photoresistor CDS has no light, and its resistance rises rapidly, so that the current flowing into the V base is followed. Reduce, LC should also decline. At this time, the LC is smaller than the minimum pull-in current of K1, and then K1 is released, and the contacts of the relay K1 are restored to the position shown in the figure. Battery E continues to supply power to the telephone mother machine via K1-1B, K1-2B, so that the phone will not stop working due to the interruption of the mains; at the same time, E will also light the LED D1 through K1-1B and R3 for battery power supply indication. When the utility power is restored, it is automatically transferred to the mains supply.

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