#Battery charger 12v full
We adjust a level of VR1 to set a full battery. Then, the Zener diode-ZD1 pass an overvoltage to bias lead G of SCR2. Second, the current flows through VR1 to divide voltage down. To begin with, the positive battery voltage flows through R2 to reduce current. It will start conduct currents again, this was reversed with a frequency 100 Hz.
Then, the positive voltage waveform comes to SCR1 again. If disconnecting is not a positive voltage. Since the waveform of voltage is DC pulse, not smooth. When there is positive voltage to bias at lead G. So SCR1 does not conduct the current all time. Which it is different from the voltage with capacitor filter, that is smooth as a straight line. The current of this feature is a continuous positive half of the sine wave. Since the 15V voltage from the bridge diode is full wave rectifier. Ideally, SCR1 will conduct current and stop current alternately very fast with a frequency of 100 Hz. When SCR1 conducts, make the 15V flows through lead K to a positive battery terminal. It protects the reverse voltage before bias to lead G of SCR1. Because the 15V flow to R3, to limit the current to decrease and flow through to diode D5. The LED1 is a power indicator of the circuit.īeginning SCR1 is working. Then, flow to bridge diode to rectifier AC to DC pulse 15V. To begin with, an AC220V will flow to a transformer to transform to 15 volts. The SCR is working in DC pulse on filters with a capacitor.Īs circuit below. I suggest an Auto dry battery charger using SCR for 12V battery. The circuit above may error and hard to set. Automatic OFF 12V Battery Charger by power SCR
You need to use a constant voltage charge in PWM mode. I think this circuit is not suitable for high current battery.
For example 10A-15A transformer, 25A bride Diodes, 20A Relay and more. And less than 15A current.Īlso, you need to use a high current power supply. If you want to charge the high current battery. Then you can charge again with pressing SW2 to reset, recharge them again. Which no current to battery and voltage lower down. While the relay will pull out from the contact NC-C. When the voltage drops across it are 13.6V down. This projects will always cut off the battery. Next, I use a SCR for uses as quick control switch. Then, I use a relay to control the current to a battery. So, I use Zener diode for detects voltage over than 13V to control stop charger system. I try to test them with the Zener diode 12-volts the current will flow through it when a voltage higher than 12V. It then blocks current until the voltage exceeds a certain level. But the Zener diode is connected backward. I like use Diode, Zener diode, which they are both valves for electrical currents. In the begin, we learn a basic principle of electronic parts. But sometimes we cannot buy them.Īnd This our working is simple style only. I often use IC-op-amp such as LM339, LM311, LM324, LM301. Secondly, we need to use a comparator circuit. Then the battery voltage rises and the voltage maximum 14.4V. Normally we should charge the battery if the voltage is lower than 12.4V. It will take 10-12 hour for full.įirst of all, I think “When…Charge? And When stop?”
These two circuits help make your life easier. Thus, When the battery is full, stop charging it. If we use 1A, the battery will be full for about 7 hours.Īlso, If you charge it for too long times. For example, 12V/7AH battery you should the initial current less 2A. 6V battery maximum voltage of 7.5V, Standby use is 6.8Vīut hot-So you should use initial current less 30%. 12V battery maximum voltage of 14.8V, Standby use is 13.8V Normally, the battery manufacturer usually prints the appropriate voltage. We must charge them with DC voltage only. While charging does not quick charge with high current and high voltage. The important, battery does not like hot! At all time, do not use or store them in too heat area.OR If while use may short circuit or high current use them will too hot.
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