WO2005034303A1 - Portable charger having built-in secondary lithium battery - Google Patents

Portable charger having built-in secondary lithium battery Download PDF

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Publication number
WO2005034303A1
WO2005034303A1 PCT/KR2003/002290 KR0302290W WO2005034303A1 WO 2005034303 A1 WO2005034303 A1 WO 2005034303A1 KR 0302290 W KR0302290 W KR 0302290W WO 2005034303 A1 WO2005034303 A1 WO 2005034303A1
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WO
WIPO (PCT)
Prior art keywords
voltage
charged
lithium battery
secondary lithium
charging
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2003/002290
Other languages
French (fr)
Inventor
Won Jae Lee
Woo Young Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
E Square Technologies Co Ltd
Original Assignee
E Square Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by E Square Technologies Co Ltd filed Critical E Square Technologies Co Ltd
Priority to AU2003274771A priority Critical patent/AU2003274771A1/en
Publication of WO2005034303A1 publication Critical patent/WO2005034303A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering with light sensitive cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/46—Accumulators structurally combined with charging apparatus
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
    • H02J7/342—The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/60—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/60—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements
    • H02J7/68—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements using circuits for correcting or protecting against reverse-polarity
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/80—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including monitoring or indicating arrangements
    • H02J7/82—Control of state of charge [SOC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Details of circuit arrangements for charging or discharging batteries or supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a portable charger having a built-in secondary lithium battery. More specifically, the invention relates to a portable charger having a built-in secondary lithium battery, which charges the built-in secondary lithium battery using AC and solar energy as a power source and charges a device with the power of the secondary lithium battery.
  • a portable charger that includes a solar cell module for converting lights collected through a light-receiving panel into electric energy, a rectifying and filtering unit for rectifying and filtering the electric energy (voltage) , a constant-current controller for controlling the voltage outputted from the rectifying and filtering unit through a constant-current control method, a constant-voltage controller for controlling the voltage outputted from the constant-current controller through a constant-voltage control method to output it as a charging voltage, a charging jack for providing the charging voltage to a battery charger, a charging state detector for detecting the voltage level of the charger and generating a control signal for indicating a charging state according to the detection result, and a charging state indicator for visually indicating the charging state according to the control signal outputted from the charging state detector.
  • This portable charger can charge the battery using solar energy even in a place where AC is not provided.
  • it is difficult to obtain charging efficiency when there is no sunlight or light intensity is weak, for example, in the rainy season or wintertime because it uses only the solar cell as a power supply.
  • a user suffers from an inconvenience of having to always open a solar cell panel in order to charge his or her device without a built-in type battery.
  • an object of the present invention is to provide a portable charger having a built-in secondary lithium battery, which charges the built-in secondary lithium battery using AC and solar energy as a power source and charges a device with the power of the secondary lithium battery.
  • a portable charger having a built-in secondary lithium battery comprising a solar cell panel for converting solar energy into electric energy; a first switch for selecting one of the output voltage of the solar cell panel and output voltage of an adapter that converts AC into DC; a protection circuit for, when the voltage outputted from the first switch is charged in the built-in secondary lithium battery, monitoring the charged voltage, to protect the secondary lithium battery from over-current, over-charging and over-discharging; the secondary lithium battery in which charging voltage outputted from the protection circuit is charged; a contact switch for confirming the quantity of voltage charged in the secondary lithium battery; a battery remaining capacity indicator for detecting the quantity of voltage charged in the secondary lithium battery and visually indicating it when the contact switch is operated
  • FIG. 1 is a block diagram for showing the construction of a portable charger having a built-in secondary lithium battery according to the present invention.
  • FIG. 1 is a block diagram for showing the construction of a portable charger having a built-in secondary lithium battery according to the present invention.
  • reference numeral 101 represents a solar cell panel for converting solar energy into electric energy
  • 102 indicates an adapter for converting AC into DC.
  • Reference numeral 103 denotes a first switch for selecting one of the output voltages of the solar cell panel 101 and adapter 102
  • 104 - indicates a protection circuit module that, when the voltage outputted from the first switch is charged in a secondary lithium battery 105, monitors the charged voltage to protect the secondary lithium battery 105 from over- current and over-charging.
  • the protection circuit module 104 also protects the lithium battery from over-discharging when the portable charger charges a user device.
  • Reference numeral 106 denotes a contact switch for confirming the quantity of voltage charged in the secondary lithium battery 105
  • 107 represents a battery remaining capacity indicator that detects the quantity of voltage charged in the lithium battery 105 and visually indicates it when the contact switch 106 is operated.
  • reference numeral 108 denotes a second switch for forming a path of charging voltage when the portable charger charges a user device
  • 109 represents a booster for boosting the charging voltage supplied through the second switch 108 to charge the user device rapidly
  • 110 indicates a reverse voltage prevention module for preventing reverse current from flowing while the charging voltage boosted by the booster 109 is charged in the user device 112.
  • Reference numeral 111 denotes a charging connector for appropriately supplying the charging voltage from the reverse voltage prevention module 110 to the user device 112, and 113 indicates a charging indicator for indicating that the user device 112 is being charged in the case where the charging voltage is supplied from the booster 109 to the user device 112 through the reverse voltage prevention module 110.
  • the solar cell panel 101 converts solar energy into electric energy to provide a voltage used for charging.
  • the adapter 102 converts AC into DC to supply a voltage used for charging.
  • the solar cell panel 101 uses a folder-type (wallet type) 2-set solar cell panel to secure sufficient condensing area.
  • the solar cell panel 101 is composed of a thin plate such that a product employing it has a thickness similar to that of a general cellular phone to allow its user to conveniently use it.
  • the first switch 103 selects one of the voltage outputted from the solar cell panel 101 and the voltage outputted from the adapter 102 to provide the selected voltage to the secondary lithium battery 05 to charge it.
  • the first switch 103 can select the voltage provided by the adapter 102, preferentially. Otherwise, it can use the voltage supplied from the solar cell panel 101 first.
  • a user selects the voltage from the solar cell panel 101 or adapter 102 by operating the first switch 103 according to a current situation.
  • the protection circuit module 104 monitors the charging voltage to protect the secondary lithium battery 105 from over-current and over-charging. In addition, it protects the lithium battery 105 from over-discharge when the user device 112 is charged.
  • the secondary lithium battery 105 any one of a lithium polymer battery using a solid electrolyte having excellent ion conductivity, a lithium ion battery using a liquid electrolyte, a lithium ion polymer battery using gel type polymer as an electrolyte can be used.
  • the lithium polymer battery is the most suitable for the secondary lithium battery 105.
  • the lithium polymer battery has no probability of leakage and danger of explosion while the lithium ion battery has them. Furthermore, the lithium polymer battery can be designed in a variety of shapes because it uses a solid electrolyte, and it can use the entire area of a portable device. Features of the lithium polymer battery are as follows. 1) It can produce a high output voltage. 2) It has a low self-discharging rate. 3) It is environmentally-friendly. 4) It has a long expected lift span. 5) It has no memory effect in which capacity is reduced when it is not fully charged or discharged. 6) It has a low inner resistance. As described above, the portable charger of the present invention has the built-in secondary lithium battery and charges the lithium battery first.
  • the charger having the built-in secondary battery can charge a user device immediately even in a place where sunlight is feeble (rainy day or wintertime) or at night.
  • the battery remaining capacity indicator 107 detects the quantity of voltage charged in the secondary lithium battery 105 and visually indicates it.
  • the battery remaining capacity indicator 107 includes achromatic, red, orange and green four LEDs, for example, to display battery remaining capacity.
  • the achromatic LED is turned on when there is barely charged voltage, and the red LED is turned on in case of low charged voltage.
  • the orange LED is turned on when the battery has an adequate quantity of charged voltage
  • the green LED is turned on when the battery is fully charged.
  • the user charges the user device 112 (cellular phone, MP3, PDA, wireless ear set, Bluetooth device and so on) using the portable charger according to the present invention
  • the user connects the user device 112 to the charging connector 111 and turns on the second switch 108.
  • the user uses a connector suitable for his/her device as the charging connector 111 such that all of device batteries using the same voltage can be charged.
  • the voltage charged in the secondary lithium battery 105 is supplied to the booster 109 through the second switch 108.
  • the booster 109 boosts the voltage to a considerably high voltage and provides the boosted voltage to the user device 112 through the reverse voltage prevention module 110 and the charging connector 111 to charge the battery of the user device 112 rapidly.
  • the reverse voltage prevention module 110 prevents the charger circuit from being damaged by reverse current when the charged voltage of the secondary lithium battery 105 is lower than the voltage of the battery of the user device 112.
  • the charging indicator 113 visually indicates it so that the user can easily recognize whether the user device is being charged or not.
  • the present invention can rapidly charge the user device (for example, wireless devices) indoors and outdoors.
  • the portable charger of the present invention has effects in that it uses the folder type (wallet type) 2-set solar cell panel so that it can secure a sufficient condensing area. Thinness and lightness of the portable charger allow a user to easily carry his or her device.
  • the portable charger of the present invention employs a high capacity and lightweight lithium polymer battery so as to ensure stability and excellent performance of the device.
  • all of batteries of devices that use the same voltage can be charged if connectors fitted for respective devices are employed.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

Disclosed is a portable charger that includes a solar cell panel for converting solar energy into electric energy; a first switch for selecting either the output voltage of the solar cell panel or output voltage of an adapter that converts AC into DC; a protection circuit for, when the voltage outputted from the first switch is charged in the built-in secondary lithium battery, monitoring the charged voltage, to protect the secondary lithium battery from over-current, over-charging and over-discharging; the secondary lithium battery in which charging voltage outputted from the protection circuit is charged; a contact switch for confirming the quantity of voltage charged in the secondary lithium battery; a battery remaining capacity indicator for detecting the quantity of voltage charged in the secondary lithium battery and visually indicating it when the contact switch is operated; a second switch for forming a path of charging voltage when a user device is charged; a booster for boosting the charging voltage supplied through the second switch to rapidly charge the user device; a reverse voltage prevention module for preventing reverse current from flowing while the charging voltage boosted by the booster is charged in the user device; and a charging connector for appropriately providing the charging voltage delivered through the reverse voltage prevention module to various user devices.

Description

PORTABLE CHARGER HAVING BUILT-IN SECONDARY LITHIUM BATTERY
Technical Field
The present invention relates to a portable charger having a built-in secondary lithium battery. More specifically, the invention relates to a portable charger having a built-in secondary lithium battery, which charges the built-in secondary lithium battery using AC and solar energy as a power source and charges a device with the power of the secondary lithium battery.
Background Art
Recently, communication devices have been subdivided by application fields and its technology follows a trend toward wireless communication. In case of a wireless device, it cannot be used any more when it has been used for a specific period of time or unless the device is provided with sufficient power from a battery combined with it, which gives an inconvenience to a user. To use the device again, it must be recharged using a charger, which takes a long period of time. To solve this problem, chargers that charge a battery using a solar cell have been proposed. One of them is a portable charger that includes a solar cell module for converting lights collected through a light-receiving panel into electric energy, a rectifying and filtering unit for rectifying and filtering the electric energy (voltage) , a constant-current controller for controlling the voltage outputted from the rectifying and filtering unit through a constant-current control method, a constant-voltage controller for controlling the voltage outputted from the constant-current controller through a constant-voltage control method to output it as a charging voltage, a charging jack for providing the charging voltage to a battery charger, a charging state detector for detecting the voltage level of the charger and generating a control signal for indicating a charging state according to the detection result, and a charging state indicator for visually indicating the charging state according to the control signal outputted from the charging state detector. This portable charger can charge the battery using solar energy even in a place where AC is not provided. However, for this charger, it is difficult to obtain charging efficiency when there is no sunlight or light intensity is weak, for example, in the rainy season or wintertime because it uses only the solar cell as a power supply. Further, a user suffers from an inconvenience of having to always open a solar cell panel in order to charge his or her device without a built-in type battery.
Disclosure of Invention Accordingly, an object of the present invention is to provide a portable charger having a built-in secondary lithium battery, which charges the built-in secondary lithium battery using AC and solar energy as a power source and charges a device with the power of the secondary lithium battery. To accomplish the object, according to the present invention, there is provided a portable charger having a built-in secondary lithium battery, comprising a solar cell panel for converting solar energy into electric energy; a first switch for selecting one of the output voltage of the solar cell panel and output voltage of an adapter that converts AC into DC; a protection circuit for, when the voltage outputted from the first switch is charged in the built-in secondary lithium battery, monitoring the charged voltage, to protect the secondary lithium battery from over-current, over-charging and over-discharging; the secondary lithium battery in which charging voltage outputted from the protection circuit is charged; a contact switch for confirming the quantity of voltage charged in the secondary lithium battery; a battery remaining capacity indicator for detecting the quantity of voltage charged in the secondary lithium battery and visually indicating it when the contact switch is operated; a second switch for forming a path of charging voltage when a user device is charged; a booster for boosting the charging voltage supplied through the second switch to charge the user device rapidly; a reverse voltage prevention module for preventing reverse current from flowing while the charging voltage boosted by the booster is charged in the user device; and a charging connector for appropriately providing the charging voltage delivered through the reverse voltage prevention module to various user devices.
Brief Description of the Drawings Further objects and advantages of the invention can be more fully understood from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. 1 is a block diagram for showing the construction of a portable charger having a built-in secondary lithium battery according to the present invention.
Best Mode for Carrying Out the Invention
The present invention will now be described in detail in connection with preferred embodiments with reference to the accompanying drawings . FIG. 1 is a block diagram for showing the construction of a portable charger having a built-in secondary lithium battery according to the present invention. In FIG. 1, reference numeral 101 represents a solar cell panel for converting solar energy into electric energy, and 102 indicates an adapter for converting AC into DC. Reference numeral 103 denotes a first switch for selecting one of the output voltages of the solar cell panel 101 and adapter 102, and 104 - indicates a protection circuit module that, when the voltage outputted from the first switch is charged in a secondary lithium battery 105, monitors the charged voltage to protect the secondary lithium battery 105 from over- current and over-charging. The protection circuit module 104 also protects the lithium battery from over-discharging when the portable charger charges a user device. Reference numeral 106 denotes a contact switch for confirming the quantity of voltage charged in the secondary lithium battery 105, and 107 represents a battery remaining capacity indicator that detects the quantity of voltage charged in the lithium battery 105 and visually indicates it when the contact switch 106 is operated. In addition, reference numeral 108 denotes a second switch for forming a path of charging voltage when the portable charger charges a user device, 109 represents a booster for boosting the charging voltage supplied through the second switch 108 to charge the user device rapidly, and 110 indicates a reverse voltage prevention module for preventing reverse current from flowing while the charging voltage boosted by the booster 109 is charged in the user device 112. Reference numeral 111 denotes a charging connector for appropriately supplying the charging voltage from the reverse voltage prevention module 110 to the user device 112, and 113 indicates a charging indicator for indicating that the user device 112 is being charged in the case where the charging voltage is supplied from the booster 109 to the user device 112 through the reverse voltage prevention module 110. The operation of the portable charger having a built- in secondary lithium battery according to the present invention, having the above-described construction, is explained below. First of all, the solar cell panel 101 converts solar energy into electric energy to provide a voltage used for charging. The adapter 102 converts AC into DC to supply a voltage used for charging. The solar cell panel 101 uses a folder-type (wallet type) 2-set solar cell panel to secure sufficient condensing area. The solar cell panel 101 is composed of a thin plate such that a product employing it has a thickness similar to that of a general cellular phone to allow its user to conveniently use it. The first switch 103 selects one of the voltage outputted from the solar cell panel 101 and the voltage outputted from the adapter 102 to provide the selected voltage to the secondary lithium battery 05 to charge it. Here, the first switch 103 can select the voltage provided by the adapter 102, preferentially. Otherwise, it can use the voltage supplied from the solar cell panel 101 first. Preferably, a user selects the voltage from the solar cell panel 101 or adapter 102 by operating the first switch 103 according to a current situation. When the voltage outputted from the first switch 103 is charged in the built-in secondary lithium battery 105, the protection circuit module 104 monitors the charging voltage to protect the secondary lithium battery 105 from over-current and over-charging. In addition, it protects the lithium battery 105 from over-discharge when the user device 112 is charged. As the secondary lithium battery 105, any one of a lithium polymer battery using a solid electrolyte having excellent ion conductivity, a lithium ion battery using a liquid electrolyte, a lithium ion polymer battery using gel type polymer as an electrolyte can be used. Preferably, the lithium polymer battery is the most suitable for the secondary lithium battery 105. The lithium polymer battery has no probability of leakage and danger of explosion while the lithium ion battery has them. Furthermore, the lithium polymer battery can be designed in a variety of shapes because it uses a solid electrolyte, and it can use the entire area of a portable device. Features of the lithium polymer battery are as follows. 1) It can produce a high output voltage. 2) It has a low self-discharging rate. 3) It is environmentally-friendly. 4) It has a long expected lift span. 5) It has no memory effect in which capacity is reduced when it is not fully charged or discharged. 6) It has a low inner resistance. As described above, the portable charger of the present invention has the built-in secondary lithium battery and charges the lithium battery first. The charger having the built-in secondary battery can charge a user device immediately even in a place where sunlight is feeble (rainy day or wintertime) or at night. When a user operates the contact switch 106 in order to confirm the charging state of the built-in secondary lithium battery 105, the battery remaining capacity indicator 107 detects the quantity of voltage charged in the secondary lithium battery 105 and visually indicates it. Here, the battery remaining capacity indicator 107 includes achromatic, red, orange and green four LEDs, for example, to display battery remaining capacity. In this case, the achromatic LED is turned on when there is barely charged voltage, and the red LED is turned on in case of low charged voltage. The orange LED is turned on when the battery has an adequate quantity of charged voltage, and the green LED is turned on when the battery is fully charged. In the meantime, in the case where the user charges the user device 112 (cellular phone, MP3, PDA, wireless ear set, Bluetooth device and so on) using the portable charger according to the present invention, the user connects the user device 112 to the charging connector 111 and turns on the second switch 108. Here, the user uses a connector suitable for his/her device as the charging connector 111 such that all of device batteries using the same voltage can be charged. Then, the voltage charged in the secondary lithium battery 105 is supplied to the booster 109 through the second switch 108. The booster 109 boosts the voltage to a considerably high voltage and provides the boosted voltage to the user device 112 through the reverse voltage prevention module 110 and the charging connector 111 to charge the battery of the user device 112 rapidly. In the case where the user device 112 is charged with the voltage charged in the secondary lithium battery 105 as described above, the reverse voltage prevention module 110 prevents the charger circuit from being damaged by reverse current when the charged voltage of the secondary lithium battery 105 is lower than the voltage of the battery of the user device 112. When the inner battery of the user device 112 is charged with the voltage discharged from the secondary lithium battery 105, the charging indicator 113 visually indicates it so that the user can easily recognize whether the user device is being charged or not.
Industrial Applicability
As described above, the present invention can rapidly charge the user device (for example, wireless devices) indoors and outdoors. Furthermore, the portable charger of the present invention has effects in that it uses the folder type (wallet type) 2-set solar cell panel so that it can secure a sufficient condensing area. Thinness and lightness of the portable charger allow a user to easily carry his or her device. Moreover, the portable charger of the present invention employs a high capacity and lightweight lithium polymer battery so as to ensure stability and excellent performance of the device. In addition, all of batteries of devices that use the same voltage can be charged if connectors fitted for respective devices are employed. While the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by the embodiments but only by the appended .claims. It is to be appreciated that those skilled in the art can change or modify the embodiments without departing from the scope and spirit of the present invention.

Claims

What Is Claimed Is:
1. A portable charger having a built-in secondary lithium battery, comprising: a solar cell panel for converting solar energy into electric energy; a first switch for selecting either the output voltage of the solar cell panel or output voltage of an adapter that converts AC into DC; a protection circuit for, when the voltage outputted from the first switch is charged in the built-in secondary lithium battery, monitoring the charged voltage, to protect the secondary lithium battery from over-current, overcharging and over-discharging; the secondary lithium battery in which charging voltage outputted from the protection circuit is charged; a contact switch for confirming the quantity of voltage charged in the secondary lithium battery; a battery remaining capacity indicator for detecting the quantity of voltage charged in the secondary lithium battery and visually indicating it when the contact switch is operated; a second switch for forming a path of charging voltage when a user device is charged; a booster for boosting the charging voltage supplied through the second switch to rapidly charge the user device; a reverse voltage prevention module for preventing reverse current from flowing while the charging voltage boosted by the booster is charged in the user device; and a charging connector for appropriately providing the charging voltage delivered through the reverse voltage prevention module to various user devices.
2. - The portable charger having a built-in secondary lithium battery as claimed in claim 1, wherein the battery remaining capacity indicator includes an achromatic LED for indicating that there is barely voltage charged in the battery, a red LED for indicating that the charged voltage is not sufficient for charging the user device, an orange LED for indicating that there is an adequate quantity of voltage charged in the battery, and a green LED for indicating that the battery is fully charged.
PCT/KR2003/002290 2003-10-08 2003-10-29 Portable charger having built-in secondary lithium battery Ceased WO2005034303A1 (en)

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