Backup power for phone with caller ID. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Protection of equipment from emergency operation of the network
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Many modern telephones with automatic caller identification (CALL) have the ability to be powered by built-in AA batteries in the event of a power failure. These elements have to be periodically replaced at the most inopportune moment. You can solve this problem by replacing the batteries with batteries.
Rice. 1. Schematic diagram of the backup power device
On fig. 1 shows a schematic diagram of a device for guaranteed power supply to a phone with caller ID (Venus5! rev.2 board). An unstabilized voltage of 8,5 ... 9 V is supplied to the input of the circuit. The backup power module is assembled on the elements DA1, D1, D2, R1, R2, Bat1 -4. The input voltage through the diode D1 and the quenching resistor R1 is supplied to a battery of four AAA batteries (800 mA / h) and a parallel regulator DA1, which controls the battery charge. As soon as the voltage on the battery becomes more than 5,5 V, DA1 opens and passes the charging current through itself. In the event of a mains voltage failure, power is supplied through diode D2, which reduces the output voltage of a fully charged battery (1,375 Vx4 \u5,5d 5 V) to 5 V. In normal mode, power is provided by a 2 V voltage regulator, on elements DA1, C3-C3. Schottky decoupling diodes D4, DXNUMX are located on the AON board.
Setting up the device comes down to setting the resistor R2 (with the batteries disconnected) at terminals 2, 3 DA1 voltage of 5,5 V.
Rice. 2. Printed circuit board of the device. 3. Location of elements on the board
The printed circuit board of the device is shown in fig. 2, and the layout of elements in fig. 3. The board is glued to a standard battery cassette using double-sided tape. The whole circuit is placed in the phone case.
Rice. 4. Appearance of the backup power device
This device (appearance - in Fig. 4) can be used for guaranteed power supply of other low-power devices with a 5 V supply.
Publication: radioradar.net
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