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Mobile Phone Patent Abstract
A micro mobile phone battery charger for nickel hydrogen and lithium
ion batteries, having advantages of high charging efficiency, quick
charging, being adaptable for use with different voltages, and compactness.
includes a casing, a rotary concealable charger plug, an internal
circuit device, and battery terminals arranged to retain the battery
in the housing and eliminate the need for lead wires. The internal
circuit device, includes an overload, over-voltage protection circuit,
an electromagnetic interference filter circuit, a voltage stabilizing
circuit, an oscillation circuit, a direct current rectifying circuit,
a car charge direct current input protection circuit, an alternating
current filter circuit, a detection circuit, and an automatic power
interruption system. The current is automatically adapted so that
the input voltage range is from 90 to 250V to adapt to municipal
currents of 110 to 240V and car charging.
Mobile Phone Patent Claims
What is claimed is:
1. A mobile phone battery charger, comprising:
a casing having opposite first and second sides;
a charger plug mounted to the first side of said casing and arranged
to be rotated from a position in which the charger plug is concealed
in said casing to a position in which the charger plug extends from
the casing and therefore can be inserted into an electrical outlet
through which alternating current is input to the charger;
a DC power input jack;
an internal circuit device connected to said charger plug and to
said direct current input jack, and
battery contacts connected to said internal circuit device and
extending from said second side of the casing, said contacts being
arranged to engage terminals on a mobile phone battery pack in order
to establish a charging connection between said internal circuit
device and a battery in said battery pack when said battery pack
is fitted between said contacts on said second side of the casing,
wherein said internal circuit device comprises:
(A) AC power input means coupled to the charger plug for filtering
and rectifying AC power input through said charger plug, said AC
power input means comprising:
(a) an over-voltage protection circuit coupled to the charger plug,
said over-voltage protection circuit;
(b) an electromagnetic interference filter coupled to the protection
circuit and arranged to absorb high frequency transients resulting
from electromagnetic interference;
(c) a voltage stabilizing circuit coupled to an output of the electromagnetic
interference filter;
(d) a rectifying circuit coupled to the voltage stabilizing circuit;
(B) a common node connected to an output of said rectifying circuit
and to said DC power input jack;
(C) a smoothing filter between said common node and said battery
contacts and arranged to output a charging current to a battery
connected to said battery contacts;
(D) a charge detection circuit also coupled to said battery contacts
and arranged to detect whether a battery in said battery pack is
fully charged; and
(E) a power interruption system connected to the charge detection
circuit and arranged interrupt a supply of power from said smoothing
filter to said battery contacts when said battery is fully charged.
2. A mobile phone battery charger as claimed in claim 1, wherein
said over-voltage protection circuit includes a resistor connected
to one of said prongs and a zener diode connected in parallel between
said prongs and arranged to prevent excess voltages from being input
through said prongs.
3. A mobile phone battery charger as claimed in claim 1, further
comprising an oscillator circuit, and wherein said voltage stabilizing
circuit includes a transistor switched on and off by an oscillator.
4. A mobile phone battery charger as claimed in claim 1, wherein
said power interruption system comprises a silicon controlled rectifier
device having a control input connected to an output of the charge
detection circuit.
5. A mobile phone battery charger as claimed in claim 1, further
comprising a diode connected between the DC current input jack and
said common node to provide reverse voltage protection.
Mobile Phone Patent Description
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to an improved device of a micro
mobile phone battery charger, and more particularly to a charger
that is very compact to facilitate carrying, and that has a circuitry
to enable the charger to automatically adapt to different voltages,
and that is especially adapted for using car electricity and municipal
electricity. In addition, the present invention is adapted for use
with nickel hydrogen and lithium ion batteries, so that there is
no need to discharge electricity prior to charging and there are
no adverse memory effects.
(b) Description of the Prior Art
Mobile phones are very popular today. The mobile phone is used
in conjunction with a charger so that it has sufficient power supply
to enable it to be used at any time. However, conventional chargers
are usually bulky and, due to various restrictions, has the following
disadvantages:
1. As the conventional charger cannot adapt to different voltages,
it cannot be used in countries where the voltage is different.
2. As the conventional charger is equipped with a lead wire for
recharging purposes, the wire may get entangled. It is also troublesome
to assemble and connect the lead wire.
3. The conventional charger can only charge nickel cadmium batteries
and cannot effectively identify the types of batteries, which is
impractical.
4. As the conventional charger does not have a protection circuit,
when the batteries are fully charged, it will not automatically
turn off.
5. Referring to Item 4 above, since the conventional charger does
not include a protection circuit, when the batteries are fully charged,
the temperature may rise, which will consume more power and may
damage the internal components to shorten their useful life.
6. The conventional charger is not provided with an electromagnetic
interference filter circuit. Therefore, it cannot effectively avoid
interference of electric currents and voltages.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide an improved
micro mobile phone battery charger, which eliminates the user of
lead wires in conventional chargers and which utilizes a rotary
concealable charger plug to connect directly to an electrical socket.
The present invention is very compact and can adapt to different
voltages as well as use car electricity.
According to the present invention, the improved micro mobile phone
battery charger comprises a casing, a rotary concealable charger
plug, and an internal circuit device. The circuit device includes
an overload, over-voltage protection circuit, an electromagnetic
interference filter circuit, a voltage stabilizing circuit, an oscillation
circuit, a direct current rectifying circuit, a car charge direct
current input protection circuit, an alternating current filter
circuit, a detection circuit, and an automatic power interruption
system. The advantages achievable by the present invention are:
1. The greatest output current of the present charger is 250 mA.
Charging is quick, and efficiency is high. The voltage can be adapted
within the range of 90 to 250 V, and will not be restricted to any
voltage environment. The present invention can be used in any country.
2. The present invention can be used to charge nickel hydrogen
or lithium ion batteries, which is an improvement over the prior
art which can charge only a single type of battery. The present
invention additionally has a delay identifying circuit and can identify
nickel hydrogen or lithium ion batteries before proceeding with
the charging process.
3. The present invention is equipped with an over-charging protection
circuit. When the battery is fully charged, the present invention
will automatically turn off and charging will stop to protect the
batteries.
4. The present invention has an output protection circuit, so that
there is no electricity leakage at the output end.
5. The present invention is provided with an E.M.I. filter circuit,
so that it can prevent interference due with electric currents and
voltages used by household electrical appliances.
6. As the power consumed by the present invention is only 40 mW,
the temperature of the components will not rise, thus prolonging
the service life of the present invention.
7. The present invention can utilize municipal electricity and
car electricity for recharging purposes, which is very practical
compared to the prior art.
BRIEF DESCRIPTION OF THE DRAWINGS
The foregoing and other features and advantages of the present
invention will be more clearly understood from the following detailed
description and the accompanying drawings, in which,
FIG. 1 is an exploded schematic view of a preferred embodiment
of the present invention used in conjunction with a battery;
FIG. 2 is a schematic view of the rear side of the preferred embodiment
of the present invention;
FIG. 3 is a flowchart of the internal circuit according to the
present invention; and
FIG. 4 is a detailed structural view of the entire circuit of the
present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIGS. 1 and 2, the present invention is directed to
a micro charger, and in particular to a micro charger that can be
used to charge various types of chargeable batteries commonly available
on the market. The present invention includes a casing 1, a rotatable
concealable charger plug 2, a car charge direct current input J1,
and an internal circuit device 3. The front side of the casing 1
has a retaining groove 11 arranged to receive a projection 41 of
a battery 4 engage the retaining groove 11 quickly to couple the
battery 4 to the casing 1, whereby a conductive plate 12 on the
casing 1 can be pressed to achieve charging. Referring to FIG. 2,
which shows a rear side of the casing 1. The charger plug 2 is disposed
on the rear side of the casing 1. The charger plug is connected
to the internal circuit device 3 to serve as a power input end of
the circuit device. The charger plug 2 can be rotated about 90 degrees
to a position at which it can be inserted into an electrical socket.
Hence, it can be appreciated that the charger together with the
battery 4 can be directly connected to the power source by means
of the charger plug 2, without the need of use for a lead wire and
an adapter. In addition, when not in use, the charger plug 2 can
be rotated and concealed in a recess 21 on the rear side of the
casing 1 flush with the surface of the casing so as to save space.
With reference to FIGS. 3 and 4, the circuit device 3 according
to the present invention includes an overload, over-voltage protection
circuit A, an electromagnetic interference filter circuit B, a voltage
stabilizing circuit C, an oscillation circuit D, a direct current
rectifying circuit E, a car charge direct current input end protection
circuit F, an alternating current filter circuit G, a detection
circuit H, and an automatic power interruption system 1, in which:
A: Alternating current is input from the charger plug 2. The voltages
may range from 110 V to 240 V. F1 performs overload protection,
whereas AVR1 and F1 perform over-voltage protection;
B: Then, C1, L1, L2 performs electromagnetic interference filter
handling;
C: Transistors Q1, and R1, R3, R4 form a voltage stabilizing circuit,
the on or off signals being determined based on the wave curve of
the oscillation circuits.
D: Z1, D1, C4 and R2 form an oscillation circuit to switch the
transistor Q1 on or off;
E: Subsequently, the voltage is reduced to the desired level by
T1 and rectified by D2;
F: J1 of the circuit is the car charge direct current input end,
using D3 as a reverse voltage protection;
G: This is the alternating filter circuit, using C6 as a smoothing
filter capacitor:
H: This is the detection circuit used to detect whether the battery
is fully charged or not;
I: This is the automatic power interruption system. When the detection
circuit detects that the battery is fully charged, SC2 will start
action to cut off power supply, thereby stopping charging and protecting
the battery.
J: This is a charge saturation indicating circuit. When the battery
is fully charged, green light LED1 is activated. But the detection
circuit will continue to detect the battery voltage and electric
current amount. When it is smaller than a certain value, charging
will continue. Otherwise, the power will continue to be off. Detection
will continue in this mode until the battery is removed from the
charger;
K: This is an ordinary chargeable battery unit which serves as
a load on the circuit;
L: If the detection circuit detects that the circuit is not in
a saturated state, charging will continue, and illuminate red light
LED2 red light.
By means of the above circuit device 3, the present invention not
only has the advantages of quick and efficient charging, it can
be adapted for voltages in the range from 90 to 250 V, not being
restricted by any voltage environment. The present invention can
be used in any country and is therefore very practical. In particular,
the present invention eliminates the use of lead wires, adapters,
or other accessories. It can therefore appreciated that the present
invention provides a substantive improvement over the prior art.
In summary, the present invention is highly practical and has multiple
effects. It is also simple in construction, easy and safe to operate.
Although the present invention has been illustrated and described
with reference to the preferred embodiment thereof, it should be
understood that it is in no way limited to the details of such embodiment
but is capable of numerous modifications within the scope of the
appended claims. |