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1. WO2007011186 - APPARATUS FOR CHARGING PORTABLE DEVICES USING SOLAR CELL

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What is claimed is:
1. An apparatus for charging portable devices using a solar
cell, the apparatus charging a power generated in the solar cell into a
battery inside an external device, the apparatus comprising:
a microcomputer;
a built-in battery charging the power generated in the solar cell;
a built-in battery charging pulse width modulation (PWM) unit
switching a charging operation into the built-in battery from the solar cell and controlling the magnitude of a voltage (a charge voltage) supplied to the built-in battery;
a built-in battery discharging PWM unit switching a discharging operation in which the voltage charged in the built-in battery is discharged into the external device and controlling the magnitude of a discharge voltage;
a temperature sensor sensing a temperature of the built-in battery; and a voltage input/output unit outputting the voltage discharged from
the built-in battery to the external device and having a common
connection terminal to which a voltage is inputted from the outside, so as to supply an output voltage of an external battery charger to the built-in
battery.

2. The apparatus of claim 1 , wherein the microcomputer
comprises:
a built-in battery charging PWM controller controlling the built-in
battery charging PWM unit by transmitting a PWM signal to the built-in
battery charging PWM unit;
a built-in battery discharging PWM controller controlling the
built-in battery discharging PWM unit by transmitting a PWM signal to
the built-in battery discharging PWM unit; and
a battery temperature monitoring unit allowing the built-in battery
charging PWM unit to stop an operation of the built-in battery charging
PWM unit when a temperature of the battery sensed by the temperature
sensor is substantially higher than an allowable temperature range.

3. The apparatus of claim 1 , wherein the microcomputer comprises:
a built-in battery charging PWM controller controlling the built-in battery charging PWM unit by transmitting a PWM signal to the built-in battery charging PWM unit;
a built-in battery discharging PWM controller controlling the
built-in battery discharging PWM unit by transmitting a PWM signal to the built-in battery discharging PWM unit; and
a built-in battery overcharge preventing unit allowing the built-in battery charging PWM unit to stop an operation of the built-in battery charging PWM unit when measured charge voltage and measured charge current of the built-in battery are substantially larger than predetermined reference values.

4. The apparatus of claim 1 , wherein the microcomputer comprises:
a built-in battery charging PWM controller controlling the built-in battery charging PWM unit by transmitting a PWM signal to the built-in battery charging PWM unit;
a built-in battery discharging PWM controller controlling the
built-in battery discharging PWM unit by transmitting a PWM signal to the built-in battery discharging PWM unit; and
an external device type recognizing unit allowing the built-in battery discharging PWM controller so that the built-in battery discharging PWM unit varies a voltage, by measuring a voltage, a current and an impedance of an external device battery engaged in the connection terminal of the voltage input/output unit and by calculating a discharge voltage and a discharge current suitable for the measured voltage and current of the external device battery.

5. The apparatus of claim 1 , wherein the microcomputer comprises: a built-in battery charging PWM controller controlling the built-in
battery charging PWM unit by transmitting a PWM signal to the built-in
battery charging PWM unit;
a built-in battery discharging PWM controller controlling the
built-in battery discharging PWM unit by transmitting a PWM signal to
the built-in battery discharging PWM unit; and
a voltage pump functioning unit allowing the built-in battery
discharging PWM controller to control the built-in battery discharging
PWM unit and to boost a voltage outputted from the voltage input/output
unit when a current and a voltage of a load connected to the connection
terminal of the voltage input/output unit are measured and the load
current is larger than a minimum of a predetermined value and the load
voltage is equal to or less than a maximum of a predetermined voltage
range.

6. The apparatus of claim 1 , wherein the voltage input/output
unit comprises:
a first switching member forming a path on which the voltage
discharged from the built-in battery is outputted to the outside via the
connection terminal; and
a second switching member forming a path on which the voltage
outputted from the external battery charger is inputted via the connection terminal and the built-in battery is charged by the input voltage.

7. The apparatus of claim 1 , further comprising:
a light-emitting source emitting light by the discharge voltage of
the built-in battery; and
a light-emitting unit including a switch for switching on or off the
light-emitting source.