WO1998048470A1 - Portable power system - Google Patents
Portable power system Download PDFInfo
- Publication number
- WO1998048470A1 WO1998048470A1 PCT/US1998/008203 US9808203W WO9848470A1 WO 1998048470 A1 WO1998048470 A1 WO 1998048470A1 US 9808203 W US9808203 W US 9808203W WO 9848470 A1 WO9848470 A1 WO 9848470A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voltage
- adapter
- converter
- battery pack
- rated
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
-
- 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
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/247—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/256—Carrying devices, e.g. belts
-
- 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 generally to a portable electrical power system. More particularly, the present invention relates to a portable power supply designed to power a tool or other electrical appliance, the system including a battery pack associated with a DC to DC voltage converter.
- Portable also commonly known as “cordless” electrical tools and other devices, appliances, and equipment (such as video cameras and the like) require an adequate supply of power from battery packs that are typically received in a portion of the tool housing.
- battery packs are inherently heavy, as explained in application no.
- U.S. Patent No. 5,211,321 issued on May 18, 1993, to N. Rodriguez, entitled “Battery And Equipment Vest,” discloses a garment configured as a vest to receive several battery cells to provide power to video recording equipment.
- the vest includes several storage pockets placed around the waist of the user to receive the cells.
- the vest may be associated with a belt having pockets configured to house the cells.
- the garment may also include a device to recharge the cells when required, thereby providing a mobile and convenient power source.
- the battery and equipment vest has adjustable shoulder straps and adjustable waist to ensure a comfortable fit for multiple users while orderly maintaining electrical interconnections.
- the weight of the battery is distributed along a belt disposed around the waist of the user.
- the power supply belt can include a selector switch so that the power source can be used with a variety of electrical implements having different operating voltages.
- the belt also includes an inverter to allow its use with AC powered tools. In all of these cases, however, the resistance of the cord connecting the power source, i.e., the garment or the belt, to the tool causes line losses which manifest themselves by a voltage drop at the tool particularly when the tool operates under significant load conditions.
- the tool becomes powered at a voltage that is less than its rated voltage, thereby reducing the amount of work that can be produced by the tool when it is most needed.
- Connections between the power source and the cord and between the cord and the tool also frequently create additional losses thereby compounding the problem.
- line and connection losses generally reduce the effectiveness of the tool, both in terms of the work that can be produced by the tool and the amount of time the tool can be used without having to recharge the battery pack. This is because a portion of the energy stored in the battery pack is wasted in line and connection losses instead of being usable by the tool to be converted into work.
- prior art power sources often deliver a voltage that is higher than the rated voltage of the tool with which the power source is associated.
- the drawback of this approach is that under limited load conditions (e.g., when a relatively small amount of work is required of the tool) , the current drawn by the tool is correspondingly small thereby causing the tool to operate at a voltage that is greater than its rated voltage.
- over-voltage conditions may damage certain features of the tool such as for example the tool variable speed trigger circuit.
- the portable power system designed to supply low level direct current voltage to a portable electrical device in accordance with the present invention includes a battery pack having at least one cell providing a first direct current voltage, and an adapter.
- the adapter which is electrically connected to the battery pack by an electrical cord, is mechanically coupled to the device.
- the adapter includes a DC to DC voltage converter supplying a second direct current voltage to the device, the second voltage being smaller than the first voltage but sufficient to permit the intended operation of the device.
- the adapter includes a voltage selector to selectively match the second voltage to the device rated voltage.
- the adapter comprises a first portion configured to be mechanically and electrically connected to the device, and a second portion connected to the cord.
- the voltage selector matches the second voltage to the rated voltage when the first portion is coupled to the second portion.
- Figure 1 is an elevational view of the Portable Power System of the present invention, the system being associated with a back-pack to be worn by the user;
- FIG. 1 is an elevational view of the battery pack and associated cord and adapter of the Portable Power System of the present invention
- FIG. 3 is an electrical block diagram of the battery pack of the Portable Power System of the present invention.
- Figure 4 is an electrical block diagram of the adapter of the Portable Power System of the present invention.
- the present invention relates to electrical power systems used to power cordless devices. It will become apparent from the following description that the features of the present invention may be utilized with any kind of cordless device such as power tools, video equipment, household electrical appliances and the like. However, for ease of understanding and convenience the following description will essentially simply refer to a direct current power tool. Nevertheless, those skilled in the art will readily recognize the many other applications of the present invention.
- a portable electrical power system in accordance with the present invention is used to power an electrical device 20.
- Power system 10 includes a battery pack 12 having at least one cell 13 (diagrammatically shown on Figure 3) .
- Battery pack 12 which is preferably, although not necessarily, of the rechargeable type, is connected via an electrical cord 14 to an adapter 16.
- cord 14 is provided with a suitable connector 18 to allow adapter 16 to be disconnected from battery pack 12.
- the user will typically disconnect connector 18 from battery pack 12 and connect a charger (not shown) to recharge cells 13.
- Power system 10 may be advantageously associated with a back pack-type garment 22 to be worn by the user.
- garment 22 includes a plurality of straps 24 and a belt 26, to be secured over and around the shoulders and waist of a user (not shown) , respectively. Straps 24 and belt 26 may be adjustable to further facilitate the use of power system 10.
- power system 10 may simply be associated with a belt disposed around the waist of the user, or it may be configured to be clipped onto the user's belt.
- adapter 16 which is preferably permanently connected at the end of cord
- adapter 16 is formed of a first portion 28 configured to be mechanically and electrically connected to device 20, and of a second portion 30 connected to cord 14.
- portion 28 is represented as having a base 32 connected to a stem 34 extending away from base 32.
- stem 34 is inserted into a portion of device 20 when adapter 16 is connected thereto.
- second portion 30 is configured to be releasably attached to first portion 28 so that various devices 20 can be powered by a single power system 10 simply by associating second portion 30 with an appropriately configured first portion 28.
- adapter 16 can be formed in one piece. In that case, to power several devices 20 representing various operating voltages and configurations, a user would have several adapters 16, each adapter 16 being dedicated to a particular device to be powered by portable system 10. Also, instead of being permanently mechanically attached to adapter 16 as shown in Figure 2, cord 14 could be releasably connected to adapter 16 using an appropriate connector (not shown) . This configuration, however, would most likely create potentially detrimental voltage losses at that additional connection.
- adapter 16 includes a DC to DC voltage converter 36.
- Converter 36 supplies to device 20 a second direct current voltage designated as V ⁇ on Figure 4.
- V ⁇ will generally correspond to the voltage that has been rated by the manufacturer of device 20.
- the function of voltage converter 36 is to step down first voltage V B produced by battery pack 12 at connector 18 (as shown on Figure 3) to second voltage V ⁇ .
- first voltage V B which, in accordance with the present invention is higher than second voltage V ⁇ needed at device 20, is transmitted by electrical cord 14, line losses occurring during the operation of device 20 are reduced.
- Second voltage V ⁇ which is needed at device 20, generally although not necessarily corresponds to the rated voltage of device 20, that is the voltage that should normally be applied to device 20 for such device to operate as designed by the manufacturer of such item. As noted earlier, it is desirable to be able to use power system 10 with a variety of devices 20. In certain cases, however, such devices may have significantly different rated voltages.
- power system 10 may also include a voltage selector designated generally as 38 on Figure 4.
- Voltage selector 38 cooperates with voltage converter 36 to permit adapter 16 to supply the appropriate voltage (typically the voltage for which device 20 is rated) to device 20.
- Voltage selector 38 may include a plurality of mechanical or solid state switches, that are selectively activated when adapter 16 is coupled to device 20. Since three switches provides eight possible permutations, such combination of three switches would allow adapter 16 to power commercially available devices that have rated voltages of 7.2 , 9.6, 12, 14, 18, and 24 volts, for example.
- second portion 30 may include a plurality of mechanical micro-switches (commonly known in the trade as "Reed switches") that are activated by cammed regions formed on base 32 when base 32 is mechanically coupled to second portion 30.
- selector 38 may simply consist of a dedicated resistor housed in base 32 of first portion 28. Upon mating of first portion 28 with second portion 30 the voltage selector resistor will become electrically connected to converter 36 housed in second portion 30.
- Voltage converter 36 may take many forms, so long as it is capable of effectively stepping first voltage V B down to second voltage V ⁇ .
- voltage converter 36 is a step-down (also called "buck") DC/DC converter.
- Converter 36 includes as its essential component integrated circuit no. UC3874, the description and operation of which is included in a preliminary Unitrode technical bulletin dated February 1996 covering integrated circuits UC1874, 2874, and 3874, which is incorporated herein by reference.
- Converter 36 also includes MOSFET switches to minimize conduction losses, since it is well known that MOSFET switches have a relatively low conduction resistance.
- Converter 36 is controlled, synchronized, and optimized by a microprocessor 40. To perform these functions, the inventors have presently selected for microprocessor 40 integrated circuit no. PIC16C71 by Microchip.
- adapter 16 may be provided with a light source (not shown) , the light source being designed to illuminate a region extending about device 20, for example when adapter 16 is coupled to device 20.
- Adapter 16 may also include various sensing and indicating components such as a temperature sensor 42 which monitors the operating temperature of adapter 16, a display 44 which is could be a seven segment LED display or individual LED ' s grouped in a bar graph configuration to provide a read out of battery charge, operating temperature, and other operating conditions of power system 10.
- Power system 10 may also include various monitoring and control modules 46, circuit isolators 48, and associated components.
- Adapter 16 may also take many other forms so long as it is proximately associated with voltage converter 36.
- battery pack 12 may include a single cell 13 or a plurality of cells, which may be rechargeable or disposable. It should be understood, however, that these and other substitutions, modifications, changes and omissions may be made in the design and arrangement of the elements disclosed herein without departing from the scope of the appended claims .
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU73614/98A AU7361498A (en) | 1997-04-23 | 1998-04-23 | Portable power system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/842,062 | 1997-04-23 | ||
US08/842,062 US5929597A (en) | 1997-04-23 | 1997-04-23 | Portable electrical power system to supply direct current voltage |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998048470A1 true WO1998048470A1 (en) | 1998-10-29 |
Family
ID=25286432
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1998/008203 WO1998048470A1 (en) | 1997-04-23 | 1998-04-23 | Portable power system |
Country Status (3)
Country | Link |
---|---|
US (2) | US5929597A (en) |
AU (1) | AU7361498A (en) |
WO (1) | WO1998048470A1 (en) |
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CN102263217A (en) * | 2011-05-31 | 2011-11-30 | 常州格力博工具有限公司 | Backpack power device for handheld tool |
CN102386348A (en) * | 2010-08-25 | 2012-03-21 | 株式会社牧田 | Battery devices |
CN103170953A (en) * | 2011-12-22 | 2013-06-26 | 安德烈亚斯.斯蒂尔两合公司 | Electric work apparatus with electric load and rechargeable battery pack |
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US9267998B2 (en) | 2011-12-22 | 2016-02-23 | Andreas Stihl Ag & Co. Kg | Protective circuit for a rechargeable battery pack |
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WO2000042692A1 (en) * | 1999-01-18 | 2000-07-20 | Sony Computer Entertainment Inc. | External power supply device |
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CN102386348B (en) * | 2010-08-25 | 2014-06-04 | 株式会社牧田 | Battery devices |
CN102263217A (en) * | 2011-05-31 | 2011-11-30 | 常州格力博工具有限公司 | Backpack power device for handheld tool |
CN103170953A (en) * | 2011-12-22 | 2013-06-26 | 安德烈亚斯.斯蒂尔两合公司 | Electric work apparatus with electric load and rechargeable battery pack |
US9267998B2 (en) | 2011-12-22 | 2016-02-23 | Andreas Stihl Ag & Co. Kg | Protective circuit for a rechargeable battery pack |
US9289893B2 (en) | 2011-12-22 | 2016-03-22 | Andreas Stihl Ag & Co. Kg | Electric work apparatus with an electric load and a rechargeable battery pack |
JP2014017953A (en) * | 2012-07-06 | 2014-01-30 | Hitachi Koki Co Ltd | Battery pack, adapter capable of connecting charger and battery pack, and, charging system including them |
EP2819207A1 (en) | 2013-06-25 | 2014-12-31 | Outils Wolf | Combination of a support system, battery and driven device |
WO2016062131A1 (en) * | 2014-10-23 | 2016-04-28 | 常州格力博有限公司 | Gardening tool portable power source |
CN105762313A (en) * | 2016-04-08 | 2016-07-13 | 常州格力博有限公司 | Battery carrying device and garden tool with same |
CN105762313B (en) * | 2016-04-08 | 2019-04-02 | 常州格力博有限公司 | Battery Backpack device and its garden instrument |
Also Published As
Publication number | Publication date |
---|---|
AU7361498A (en) | 1998-11-13 |
US6087815A (en) | 2000-07-11 |
US5929597A (en) | 1999-07-27 |
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