Title of Invention

ADAPTER FOR LAPTOP AND OTHER ELECTRONIC DEVICES

Abstract The present invention relates to an adapter for laptop and other electronic devices comprising a means for generating the D.C. voltage from the solar rays, a voltage regulator circuit connected to the said means to regulate the voltage produced to the required voltage, a voltage divider connected to the said voltage regulator circuit to obtain the different required voltage, amplifying means for amplifying the selected voltage signal from voltage divider, a driver stage connected to the said voltage divider for positive feed back, means for supplying the required supply to the device protecting the load from phase reversal.
Full Text Field of the invention
The present invention relates to a solar energy powered adapter for
charging battery of a laptop and other electronic devices.
Background of the invention
There is no doubt that electricity is one of the important indicator for
economic development of a nation, therefore, in the last century world wide
efforts have been made to generate maximum electricity for upliftment of all
types of different industrial, commercial and public uses. The share of
production of electricity by using fossil fuel is quite high due to low efficiency
of thermal power stations. The use of fossil fuel is increasing day by day at
such a high rate, it is expected that by another four to five decades, fossil
fuel reserved on earth will get completely exhausted. Therefore, it is very
much essential to take initiative without further loss of time to tap another
resource for power generation. If the pace of economic development is to
be maintained without any hindrance then the increasing demand of energy
must be met. In one of the estimate, it is revealed that the Quantum of solar
energy that is available on the earth, say on Sahara Desert, which lias
about 805 SQ. KM area is enough to generate electricity by the presently
available technology for conversion of solar energy into electricity, is higher
than the total electricity that the world is using today. Therefore, instead of
developing the deserts for another economic purpose, it appears wiser to
use it for power generation. Now this discussion amply proves the
importance of solar energy for production of electricity.
In the era of Mobile Technology and Blue Tooth Technology, the constraint
for use of these gadgets is continuous availability of power source. Power
source is normally the charge stored in the battery, which in turn is being
charged with electricity. In case one moves on weekend for camping,

trekking or in warfare the person is away from the electricity supply source
for more than four hours and after four hours use, the gadgets become
inoperative particularly in remote areas, villages where electricity is not
available. This leads a need of solar power source, which will then become
compatible with the mobile gadgets.
The solar panels can be easily added in a series or parallel to get standard
voltage and power level suitable for further modulation. Solar drive interface
will be used for modulation of power compatible for laptop battery, camera
or mobile battery charging. The flexibility of a multi point adaptor with
modulated voltage will increase the functionality and uses.
The problem with many battery-operated devices is that the cost of
replacement batteries is high and often the battery life is extremely short.
This problem can be reduced by mating use of rechargeable cells but this
usually involves connecting a charging device to a mains supply.
It has previously been proposed in U.S. Pat. No. 4,686,441 to provide a
photoelectric charger including a solar electric panel for generating a
charging current for a battery, however, the arrangement is cumbersome
and does not provide a practical solution to the problem.
In this work, it has been observed that solar panels are easily available at
the market of standard specifications and simultaneously Laptops are
available having various specifications. All type of the Laptops today
available are used by using AC adapters and with AC supply lines. In case
Solar Panels which produces electricity using solar energy is to be used for
the operation of the Lap-Tops, there is mismatch of specifications in the two
sides i.e. Solar panel side and Lap-Top side. To overcome this difficulty in
interface component in the form of solar drive adaptor has been designed
and developed by the inventors.

If the people throughout the world use this solar drive the pressure on the
normal electricity generation system will ease to a great extent. More than
millions of Laptops are in use for various purposes and hundreds of Mega
Watts of electricity sharing the world; once this solar drive adaptor is
patented, the Laptop maker can take its production and may make available
in the market to the common user.
Summary of the invention
The present invention relates to a solar energy powered adapter for
charging battery of a laptop and other electronic devices.
More particularly, the present invention relates to an Adapter for laptop and
other electronic devices comprising a means for generating the D.C. voltage
from the solar rays, a voltage regulator circuit connected to the said means
to regulate the voltage produced to the required voltage, a voltage divider
connected to the said voltage regulator circuit to obtain the different
required voltage, amplifying means for amplifying the selected voltage
signal from voltage divider, a driver stage connected to the said voltage
divider for positive feed back, means for supplying the required supply to
the device protecting the load from phase reversal
The object of the present invention is to provide an adapter for charging the
battery of a laptop and other electronic devices.
Statement of the Invention
A solar energy powered adaptor for laptop comprises at least a pair of solar
plates connected in series for generating the D.C. voltage from the solar
rays, a voltage regulator circuit connected to the said pair of solar plates to
regulate the voltage produced to the required voltage, a voltage divider
connected to the said voltage regulator circuit to obtain the required voltage,

amplifying circuit for amplifying the selected voltage signal from voltage
divider characterized by a driver stage connected to the said voltage divider
for positive feed back and a pair of powered transistor connected in parallel
through a wire bond resistor to increase current carrying capacity for
supplying the amplified signal.
In an embodiment of the present invention, means are provided for
generating the DC voltage which is a solar panel made up of at least a pair
of solar plates connected in series
In another embodiment of the present invention a voltage regulator circuit
is connected to the said solar panel for regulating the voltage produced up
to a minimum fixed required level, comprising an Integrated circuit
controlled by a power transistor and rectifier connected at the input
Integrated circuit to avoid phase reversal .
In yet another embodiment of the present invention, a voltage divider circuit
is connected to the voltage regulator for obtaining required voltage range
comprising a pair of fixed resistor an one variable resistor shunted by a
capacitor.
In still another embodiment of the present invention, amplifying means is a
driver circuit connected to the voltage divider to amplify the selected voltage
signal from the voltage divider for positive feedback to make the circuit
latch,
In yet another embodiment of the present invention, a divider circuit
comprising a pair of transistors, a pair of capacitors & resistance network is
connected to zener diode to give the selected voltage .
In still another embodiment of the present invention, means of supplying the
amplified signal comprises at least a pair of power transistors connected in

parallel through a wire wound resistance to increase current carrying
capacity .
The adapter is useful for charging the batteries of laptops and other electronic
devices having rechargeable battery.
A more complete appreciation of the invention and the attendant advantages
thereof will be more clearly understood by reference to the following
accompanying drawings which are for illustrative purposes, hence the same
should not be construed to restrict the scope of the invention.
Fig. 1 illustrates a block diagram of the system
Fig. 2 illustrates the circuit diagram of the panel connecting the solar panels
to the main charging system of the device.
Fig. 3 illustrates the solar panels that are incorporated in the device which
are to be used for generating the DC volt from the sunrays. Two solar plates
have been used which are combined to each other and are capable to
deliver up to 36 volts during bright sunlight.
Fig. 4 illustrates the circuit diagram of the voltage regulator, which regulates
the output voltage from the solar panels, as the output voltage from the
solar panels is much higher than the required voltage.
Fig. 5 illustrates the circuit diagram of the voltage divider, which comprises
of R5, R6 and VR1, which is used for getting required voltage range. C4 is
the filter capacitor.
Fig. 6 illustrates the circuit diagram of the driver. Transistors T1 and T4 are
used for amplifying the selected voltage signal from voltage divider Stage.

R4 is used for positive feedback to make the circuit latch. ZS1 is voltage
limiter diode applied to emitter of T4. T3 and T4 are given positive supply
line Via R1, C2 and R3.
Fig 7 illustrates the circuit diagram of the output section. There are two
power transistors used in the circuit in parallel connection to improve the
current carrying capacity. R2 is current limiting resistance. D2 is used to
protect the load from phase reversal.
Fig. 8 illustrates the circuit diagram of the solar mobile charger connected to
solar panels on one side and the mobile device on other side.
(Fig.- 2) A circuit diagram of the panel connecting the solar panels to the
main charging system of the device consists of four sections. In first section,
there is a regulator circuit consisting of one IC and a Power Transistor.
Property of the used IC is to regulate the Voltage from the range (25 Volt -
38 Volt) to 24 Volts which is easily available in the market. Means that at
any input voltages, 24 Volts- onwards, output voltage will be fixed at 24
Volts.
The designed circuit (Fig 2) consists of four sections. In first section, there is a
regulator circuit consisting of one IC and a Power Transistor. Property of the
used IC is to regulate the Voltage from the range (25 Volt - 38 Volt) to 24 Volts,
At any input voltages, 24 Volts- onwards, output voltage would be fixed at 24
Volts.
In the circuit, two solar plates connected in series (Fig. 3) having output voltage
of 24 volts (in bright sunlight) have been used, generated voltag,e of the set will
be more than 24 Volts. In this case, the circuit may get damaged as the actual
circuit is designed to operate from the Voltage range of 22 to 24 volt. In diffused

light generated voltage of the set may be less than 24 volt, which will not affect
the original circuit.
To increase the power capacity of the said IC one Power Transistor (T-1)
has been used which is capable to carry the required current. To protect the
actual circuit from the phase reversal from solar panel end, one rectifier (D-
I) is used.
Output of the regulator circuit goes to the inputs of the divider (Fig.-5), driver
(Fig.-6) and Output (Fig. 7) circuits. The divider Circuit is used for selecting the
required voltage signal by using a series combination of two fixed Resistances
(R5 & R6) and one variable resistance (VR1). This voltage signal is amplified by
Driver Section with the help of Transistor (T3 & T4), Capacitor (C2 & C3) and
Resistance Network (Rl, R3, R4)
Now, the amplified signal is fed to the output section. This section consists
of two Power Transistors 2 x T 2 in parallel with a wire wound resistance
(R2) to increasing the current carrying capacity. The wire wound resistance
is used to protect the junctions of the Power Transistors.
The Output Section finally delivers the required voltage to drive the Lap- Top/
other electronic devices. To protect the Lap- Top/ other electronic devices from
the risk of phase reversal, another rectifier (D2) is also used.
While particular embodiments of the present invention have been illustrated and
described, it would be obvious to those skilled in are that various other changes
and modifications can be made without departing from the spirit and scope of the
invention. It is therefore intended to cover in the appended claims all such
changes and modifications that are within the scope of this invention. -

We claim:
1) A solar energy powered adaptor for laptop comprises at least a pair of
solar plates connected in series for generating the D.C. voltage from
the solar rays, a voltage regulator circuit connected to the said pair of
solar plates to regulate the voltage produced to the required voltage,
a voltage divider connected to the said voltage regulator circuit to
obtain the required voltage, amplifying circuit for amplifying the
selected voltage signal from voltage divider characterized by a driver
stage connected to the said voltage divider for positive feed back and
a pair of powered transistor ( T 1 & T 4 ) connected in parallel
through a wire bond resistor to increase current carrying capacity for
supplying the amplified signal.
2) An adapter as claimed in claim 1, wherein the said voltage regulator
circuit connected to the said solar panel for regulating the voltage
produced up to a minimum fixed required level, comprises an
Integrated circuit (7824) controlled by a power transistor ( R 2 )
and rectifier connected at the input Integrated circuit to avoid phase
reversal.
3) An adapter as claimed in claim 1, wherein the said voltage divider
circuit comprises of a pair of fixed resistor an one variable resistor
shunted by a capacitor.
4) An adapter as claimed in claim 1, wherein the said amplifying circuit
amplify the resulting voltage signal from the voltage divider.

5) An adapter as claimed in claim 1, wherein the said voltage divider
circuit comprises of a pair of transistors, a pair of capacitors &
resistance connected to a zener diode..
6) A solar energy powered adaptor for laptop substantially as
hereinbefore described with reference to the accompanying drawings.

The present invention relates to an adapter for laptop and other electronic
devices comprising a means for generating the D.C. voltage from the solar
rays, a voltage regulator circuit connected to the said means to regulate the
voltage produced to the required voltage, a voltage divider connected to the
said voltage regulator circuit to obtain the different required voltage,
amplifying means for amplifying the selected voltage signal from voltage
divider, a driver stage connected to the said voltage divider for positive feed
back, means for supplying the required supply to the device protecting the
load from phase reversal.

Documents:

806-KOL-2006-CLAIMS-1.1.pdf

806-KOL-2006-CORRESPONDENCE-1.1.pdf

806-kol-2006-granted-abstract.pdf

806-kol-2006-granted-claims.pdf

806-kol-2006-granted-correspondence.pdf

806-kol-2006-granted-description (complete).pdf

806-kol-2006-granted-drawings.pdf

806-kol-2006-granted-examination report.pdf

806-kol-2006-granted-form 1.pdf

806-kol-2006-granted-form 18.pdf

806-kol-2006-granted-form 2.pdf

806-kol-2006-granted-form 26.pdf

806-kol-2006-granted-form 3.pdf

806-kol-2006-granted-form 5.pdf

806-kol-2006-granted-reply to examination report.pdf

806-kol-2006-granted-specification.pdf

806-KOL-2006-OTHERS.pdf


Patent Number 235642
Indian Patent Application Number 806/KOL/2006
PG Journal Number 48/2009
Publication Date 27-Nov-2009
Grant Date 10-Jul-2009
Date of Filing 14-Aug-2006
Name of Patentee CHOUDHARY, GIRISH KUMAR
Applicant Address TEACHERS' QUARTERS, INSTITUTE CAMPUS, NATIONAL INSTITUTE OF TECHNOLOGY, PATNA
Inventors:
# Inventor's Name Inventor's Address
1 CHOUDHARY, GIRISH KUMAR TEACHERS' QUARTERS, INSTITUTE CAMPUS, NATIONAL INSTITUTE OF TECHNOLOGY, PATNA - 800 005
2 KUMAR, JITENDRA TEKARI ROAD, CHOUDHARY TOLA, PATHAR KI MASJID, PATNA - 800 006
PCT International Classification Number N/A
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA