3.5 Å for battery charging 14V SMPS modifiyesi get right @ Bulent NUR one of the projects with my teacher .. SMPS Charger ‘ve seen a few examples of modifiyede but I did not have the opportunity to apply. The system consists of two parts: first the output voltage of the SMPS adapter is set to the appropriate value for the battery charge (previously I have shared this topic: Increase Smps Voltage, and the addition of a simple current limiting circuit.
This battery charge can be tested on simple flyback SMPS adapters that I often see on the modification market . The output voltage can be 12V … 15V, the voltage will be adjusted by changing the TL431 voltage divider resistors, the voltage on the TL431 REF bridge will be 2.5V, the formula is 2.5V * (1 + R1 / R2). ,
As you can see in the circuit diagram, TOP2XX TopSwitch series are structured with SMPS integrations , or UC3842, UC3843, and so on. Builds with PWM, SMPS control integrations … the advanced complicated SMPS can switch to protection of power supplies, or they can fail and be careful
Current limit value is limited to 0.65V R5 resistor. 0.75A..0.8A Resistor value for charging current 0.82 Ohm power 0.5W, resistance value for 3.5A charging current 0,22 Ohm 5W resistance T1 BC547 transistor resistance value depending on the foot of the base 1K
SMPS CIRCUIT SCHEMATIC ORIGINAL AND MODIFIYE
Actually, it is easy to modify ready-made switch mode power supplies for battery charging, but whatever good measurement and testing can be done, I can finally add the schematics of the similar charge modification circuits used in the UC3842, UC3843, TOP204 integrations. Only the current, voltage control part of the secondary circuit of these circuits will be used …
The UC3842 and UC3843 are used for voltage regulation. The transformer will be used for this purpose. You will use it outside the limits of the power supply. Do not use it outside the limits of the power supply. 12V SMPS adapter can be used to charge 12V battery by setting 14.2V but using too much voltage for 6V battery will cause malfunction.