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ppt on automatic low power emergency light
Post: #1

i want automattic low power emergency light
Post: #2
to get information about the topic "automatic low power emergency light" full report ppt and related topic refer the link bellow
Post: #3

.pdf  AUTOMATIC LOW-POWER.pdf (Size: 115.58 KB / Downloads: 104)

Here is a white-LED-based
emergency light that offers
the following advantages:
1. It is highly bright due to the use
of white LEDs.
2. The light turns on automatically
when mains supply fails, and turns off
when mains power resumes.
3. It has its own battery charger.
When the battery is fully charged,
charging stops automatically.
The circuit comprises two sections:
charger power supply and LED driver.
The charger power supply section is
built around 3-terminal adjustable
regulator IC LM317 (IC1), while the
LED driver section is built around
transistor BD140 (T2).
In the charger power supply section,
input AC mains is stepped down
by transformer X1 to deliver 9V, 500
mA to the bridge rectifier, which comprises
diodes D1 through D4. Filter
capacitor C1 eliminates ripples. Unregulated
DC voltage is fed to input
pin 3 of IC1 and provides charging
current through diode D5 and limiting
resistor R16. By adjusting preset
VR1, the output voltage can be adjusted
to deliver the required charging
When the battery gets charged to
6.8V, zener diode ZD1 conducts and
charging current from regulator IC1
finds a path through transistor T1 to
ground and it stops charging of the
The LED driver section uses a total
of twelve 10mm white LEDs. All
the LEDs are connected in parallel
with a 100-ohm resistor in series with
each. The common-anode junction of
all the twelve LEDs is connected to
the collector of pnp transistor T2 and
the emitter of transistor T2 is directly
connected to the positive terminal of
6V battery. The unregulated DC voltage,
produced at the cathode junction
of diodes D1 and D3, is fed to
the base of transistor T2 through a 1-
kilo-ohm resistor.

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