The circuit to automatically turn off the battery. Simple automatic charger Who does not have time to “concern” with all the nuances of charging a car battery, monitor the charging current, turn it off in time, so as not to recharge, etc.? , we can recommend a simple auto-stop car battery charging circuit when the battery is fully charged.
This circuit uses a low-power transistor to determine the voltage on the battery.
Scheme of a simple automatic battery charger List of required parts: R1 \u003d 4.7 kΩ;
Setting P1 \u003d 10K;
T1 \u003d BC547B, CT815, CT817;
Relay \u003d 12V, 400 Ohm (can be automotive);
TR1 \u003d secondary winding voltage 14 V, current 1/10 of the battery capacity (for example: 60A / h battery - current 6A);
Diode bridge D1-D4 \u003d for a current equal to the rated current of the transformer \u003d at least 6 A (for example, D242, KD213, KD2997 ...) mounted on a radiator;
D1 diodes (parallel to the relay), D5.6 \u003d 1N4007, KD105, KD522 ...;
C1 \u003d 100uF / 25V.
In the circuit there is no load indicator, current control (ammeter) and limitation of the load current.
If desired, you can insert an ammeter into the gap of one of the wires.
LEDs with limit resistors (1 kOhm) or bulbs parallel to the “mains” C1 and parallel to the “end of load” RL1. A current equal to 1/10 of the battery capacity is selected by the number of turns of the secondary winding of the transformer.
When winding the secondary of the transformer, it is necessary to create several layers to select the optimal version of the load current.
Charging a car battery (12 volts) is considered complete when the voltage across its terminals reaches 14 volts. The cut-off threshold (14 volts) is defined by the compensation resistor, the battery being connected and fully charged.
When charging a discharged battery, its voltage will be around 13V.
During charging, the current will drop and the voltage will rise. When the voltage on the battery reaches 14 volts, transistor T1 activates relay RL1, the charging circuit is interrupted and the battery disconnects from the charging voltage of diodes D1-4.
When the voltage drops to 11.4 volts, charging resumes, such hysteresis is provided by diodes D5-6 of the emitter of the transistor. The circuit threshold becomes 10 + 1.4 \u003d 11.4 volts, which can be considered an automatic restart of the charging process.
Such a simple self-made automatic car charger will help you to control the charging process, not to trace the end of charging and not to overcharge your battery! This is a very simple decoder for your existing charger.
Which will control the charging voltage of the battery and when it reaches the set level - disconnect it from the charger, thus avoiding overcharging of the battery. This device has absolutely no rare parts. The entire circuit is built on a single transistor.
It has LEDs indicating the status: charging or battery charged. Who needs this device? Such a device will not fail to be useful to motorists.
Those who have a non-automatic feeder. This device will make your ordinary charger - a fully automatic charger. You no longer need to constantly monitor your battery charge.
All you have to do is put the battery on charge and it will automatically turn off only when fully charged.
The circuit to automatically turn off the battery. Simple automatic charger Who does not have time to “concern” with all the nuances of charging a car battery, monitor the charging current, turn it off in time, so as not to recharge, etc.? , we can recommend a simple auto-stop car battery charging circuit when the battery is fully charged.
This circuit uses a low-power transistor to determine the voltage on the battery.
Scheme of a simple automatic battery charger List of required parts: R1 \u003d 4.7 kΩ;
Setting P1 \u003d 10K;
T1 \u003d BC547B, CT815, CT817;
Relay \u003d 12V, 400 Ohm (can be automotive);
TR1 \u003d secondary winding voltage 14 V, current 1/10 of the battery capacity (for example: 60A / h battery - current 6A);
Diode bridge D1-D4 \u003d for a current equal to the rated current of the transformer \u003d at least 6 A (for example, D242, KD213, KD2997 ...) mounted on a radiator;
D1 diodes (parallel to the relay), D5.6 \u003d 1N4007, KD105, KD522 ...;
C1 \u003d 100uF / 25V.
In the circuit there is no load indicator, current control (ammeter) and limitation of the load current.
If desired, you can insert an ammeter into the gap of one of the wires.
LEDs with limit resistors (1 kOhm) or bulbs parallel to the “mains” C1 and parallel to the “end of load” RL1. A current equal to 1/10 of the battery capacity is selected by the number of turns of the secondary winding of the transformer.
When winding the secondary of the transformer, it is necessary to create several layers to select the optimal version of the load current.
Charging a car battery (12 volts) is considered complete when the voltage across its terminals reaches 14 volts. The cut-off threshold (14 volts) is defined by the compensation resistor, the battery being connected and fully charged.
When charging a discharged battery, its voltage will be around 13V.
During charging, the current will drop and the voltage will rise. When the voltage on the battery reaches 14 volts, transistor T1 activates relay RL1, the charging circuit is interrupted and the battery disconnects from the charging voltage of diodes D1-4.
When the voltage drops to 11.4 volts, charging resumes, such hysteresis is provided by diodes D5-6 of the emitter of the transistor. The circuit threshold becomes 10 + 1.4 \u003d 11.4 volts, which can be considered an automatic restart of the charging process.
Such a simple self-made automatic car charger will help you to control the charging process, not to trace the end of charging and not to overcharge your battery! This is a very simple decoder for your existing charger.
Which will control the charging voltage of the battery and when it reaches the set level - disconnect it from the charger, thus avoiding overcharging of the battery. This device has absolutely no rare parts. The entire circuit is built on a single transistor.
It has LEDs indicating the status: charging or battery charged. Who needs this device? Such a device will not fail to be useful to motorists.
Those who have a non-automatic feeder. This device will make your ordinary charger - a fully automatic charger. You no longer need to constantly monitor your battery charge.
All you have to do is put the battery on charge and it will automatically turn off only when fully charged.
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