PWM Battery Charger and Desulfator
Category: Miscellaneous
Designer: RANA MUHAMMAD ADNAN KHALIL
Notes
This circuit is designed and simulated in Proteus 7.10. In this circuit you will learn how a PWM circuit is used to charge and desulfate the lead acid battery. This circuit is very simple, economical, effective for desulfation (repair battery capacity) and easy to understand. To understand this circuit, see previous circuit "Simple Battery Charger and Desulfator" in Miscellaneous category. The working of this circuit is given below. 1. This circuit consists of just few components, a pwm generator IC which is PIC12F675, two variable resistors for pwm frequency and duty cycle adjustment, a mosfet of at least 50A for current pulses, a transistor to derive mosfet. 2. 5VDC is used for PIC microcontroller 12F675 and 15VDC is applied to give current pulses to battery. 3. The dc current meter is connected in series to measure the charging current pulses. 4. Lead acid batteries have a problem that sulfuric acid present inside battery react with the plates overtime to form layers of white powder like substance on plates. 5. This layer reduce battery life and charge storing capacity, which reduce battery backup time. 6. It has been observed that if high current pulses applied to lead acid battery, these high ampere pulses breakes the layer and cyrstals deposit on plates, which increases battery charge storing capacity and increase battery backup time. 7. This type of charger is called battery desulfator charger. 8. There are two electrical method for desulfation of battery, one is PWM charger and other is simple bridge rectification. 9. In this circuit PWM charger is used to charge and repair battery. 10. This charger is effective for both new and old lead acid batteries. It repair old battery, and prevent new battery from being damage. Application: 1. This circuit can be used to charge the battery from DC source (15Vdc to 30Vdc). 2. This circuit can be used to repair backup time of old battery. For old battery this circuit take at least 1 week to increase battery backup time. Note: New circuits are added on daily, weekly and monthly basis. So come back daily to get new amazing circuits.