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| The circuit uses a 12 volt solar panel and a variable voltage
regulator IC LM 317. The solar panel consists of solar cells each rated
at 1.2 volts. 12 volt DC is available from the panel to charge the
battery. Charging current passes through D1 to the voltage regulator IC
LM 317. By adjusting its Adjust pin, output voltage and current can be
regulated. VR is placed between the adjust pin and ground to provide an output voltage of 9 volts to the battery. Resistor R3 Restrict the charging current and diode D2 prevents discharge of current from the battery. Transistor T1 and Zener diode ZD act as a cut off switch when the battery is full. Normally T1 is off and battery gets charging current. When the terminal voltage of the battery rises above 6.8 volts, Zener conducts and provides base current to T1. It then turns on grounding the output of LM 317 to stop charging. |
Friday, 20 April 2012
solar-panel-battery-switch-schematic
solar-panel-battery-switch-schematic
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| When loading a battery during the day from a solar panel it can be
partially discharging through the panel after nightfall. This solar
panel power switch circuit replaces the diode and connects the panel to
battery through a relay contact. When the power supply voltage is to low
the relay is not ON, so the battery is not connected to the solar
panel. When the voltage is high enough to engage the relay and the LDR receives enough light in order to open T1, the relay will switch and the battery will charge.
The relay remains ON even when the solar panel voltage starts to
decrease. A battery connected and charged can not action the relay when
the light intensity decreases because R2 will block T1. The brightness
at which this occurs is set by P1.
Because the power consumption is determined primarily by the relay,
it is important that it should a miniature one, with high coil
resistance but be capable to switch up to 10 A.
Solar panel power switch schematic |
mobil charger sarkit d.mohan kumar
Most of the Mobile phone batteries are rated at 3.6 V/500 mA. A single
pen torch cell can provide 1.5 volts and 1.5 Amps current. So if four
pen cells are connected serially, it will form a battery pack with 6
volt and 1.5 Amps current. When power is applied to the circuit through
S1, transistor T1 conducts and Green LED lights.
When T1 conducts T2 also conducts since its base becomes negative. Charging current flows from the collector of T1. To reduce the charging voltage to 4.7 volts, Zener diode ZD is used. The output gives 20 mA current for slow charging. If more current is required for fast charging, reduce the value of R4 to 47 ohms so that 80 mA current will be available. Points A and B are used to connect the charger with the mobile phone. Use suitable pins for this and connect with correct polarity.
When T1 conducts T2 also conducts since its base becomes negative. Charging current flows from the collector of T1. To reduce the charging voltage to 4.7 volts, Zener diode ZD is used. The output gives 20 mA current for slow charging. If more current is required for fast charging, reduce the value of R4 to 47 ohms so that 80 mA current will be available. Points A and B are used to connect the charger with the mobile phone. Use suitable pins for this and connect with correct polarity.
MOBIL MA SOFTWORE DALANA KA LEAYA
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