Autonomous charging for a mobile phone on batteries or accumulators. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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The situation when a mobile phone is discharged, and there is nothing to feed it with, since there is no electrical network (220 V) nearby, is not so rare.
I offer a stand-alone charger for mobile phones. It can operate on any type of galvanic cells: AA or AAA finger batteries, D-0,5 or D-0,25 disk batteries, etc.
The device is built on the basis of a DC-DC converter based on the MC34063A chip or its analogue KR1156EU5. It is possible to replace MC34063A with AP34063, NJM2360, KS34063. These microcircuits are complete analogues. The MC34063A is specifically designed for switching power supplies with a minimum number of external components.
It consists of a comparator, a pulse generator, a driver, an internal temperature-compensated reference voltage source, and a powerful output switch (Fig. 1).
The input voltage of the microcircuit is from 3 to 40 V, the maximum output current is 0,3 ... 0,4 A.
The charger circuit is shown in Fig.2.
(click to enlarge)
The charger contains a charging unit for the internal battery GB1 of two batteries based on the LM7805 (DA1) chip and a DC-DC converter based on the MC34063A (DA2) chip. The input voltage is supplied from any power source. LED HL1 indicates the progress of the process.
After charging the GB1, the charger is ready to work as a mobile phone charger.
To do this, you need to connect the phone to the XS1 connector and turn on the device using the SA1 switch. The HL2 LED indicates that the phone is charging. The output voltage of the charger is 6 V. The calculation of this voltage is carried out according to the formula
Instead of batteries, you can install ordinary AA or AAA batteries in the memory. The operability of the device is maintained at a voltage of GB1 of about 2,8 V. The output charge current is limited to 0,3 ... 0,4 A.
Details and design. The charger uses MLT resistors or similar imported ones. Resistor R3 is made up of 4 1 ohm resistors connected in parallel. Capacitor C4 - tantalum, capacitors C1 ... C3, C5 and C6 - electrolytic. LEDs HL1, HL2 - any, but with a different glow color, for example, red and green. As a VD5 diode, a 1N5819 Schottky diode is used. It can be replaced with 1N5817 or 1N5818 diodes. Switch SA1 - any small-sized.
Choke L1 is a coil (with cheeks) on a rod 10 mm long made of ferrite type 2000NTs. It contains 40 turns of PEV wire 0,75 mm. Coil layers are insulated with adhesive tape and impregnated with zaponlak. It can also be made on a ferrite ring with an outer diameter of 28 ... 32 mm, on which 50 turns of 0,75 mm PEV wire are wound. Inductor L1 must withstand a current of about 1 A. Inductor L2 is wound on a ferrite rod with a diameter of 2 and a length of 5 ... 6 mm. It has 10 turns of 0,75mm wire.
You can also use industrial chokes of the series. DM with a rod magnetopath and a permissible current of at least 1 A, the active resistance of the inductor winding L1 should not exceed 0,1 Ohm.
The batteries are located in the battery compartment for the remote control.
Socket XS1 - miniature, with closing contacts. This socket allows you to automatically turn on the charger when you attach an adapter cable to connect the device to the phone. To charge different phones, you will need to make several adapter cables for each model.
Author: P. Bobonich, Uzhhorod, Ukraine
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