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WO2008001052A1 - Battery charger - Google Patents

Battery charger

Info

Publication number
WO2008001052A1
WO2008001052A1 PCT/GB2007/002348 GB2007002348W WO2008001052A1 WO 2008001052 A1 WO2008001052 A1 WO 2008001052A1 GB 2007002348 W GB2007002348 W GB 2007002348W WO 2008001052 A1 WO2008001052 A1 WO 2008001052A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
charger
electrical
charging
battery
mains
Prior art date
Application number
PCT/GB2007/002348
Other languages
French (fr)
Inventor
Paul Davidson
Original Assignee
Sutton, Alan
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

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00Circuit arrangements for emergency or standby power supply, e.g. for emergency lighting
    • H02J9/005Circuit arrangements for emergency or standby power supply, e.g. for emergency lighting using a power saving mode
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety devices
    • H02J7/0031Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety devices using battery or load disconnect circuits
    • H02J7/0032Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety devices using battery or load disconnect circuits disconnection of loads if battery is not under charge, e.g. in vehicle if engine is not running
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety devices
    • H02J7/0036Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety devices using connection detecting circuits

Abstract

A mains powered battery charger suitable for charging a rechargeable electrical device, comprising an audio alarm which sounds when the charging device is connected to a mains electricity supply and is not charging. The audio alarm may sound for the entire time the charger is not charging and yet is still connected to the mains electricity supply. Thus, when the charger is not charging, the audio alarm alerts a user to switch off the mains electricity supply to the charger.

Description

BATTERY CHARGER

According to the present invention there is provided a battery charger for connection to a mains power supply and for charging a rechargeable electrical device.

Battery powered charging devices are known which incorporate an adapter or transformer for changing the alternating current (AC) from a mains electricity supply into the direct current (DC) required to charge the rechargeable batteries of rechargeable electrical devices. As long as the charger is connected to the mains supply, for example at a wall plug, it draws electricity, whether or not the rechargeable electrical device is connected to the charger and whether or not the device is being charged. Therefore, when the battery charger is plugged into the mains supply, but is not charging the device, energy is wasted. This problem can be solved simply by disconnecting the battery charger from the mains supply, for example by switching off the mains supply connection at the wall plug. However, many users forget or can't be bothered to do this.

Many such battery chargers employ linear transformers for transforming the AC mains current into DC. Linear transformers use bulky iron cores and require many turns of copper wire in order to convert a regular AC mains supply to the low-voltage DC needed to power electrical devices. As a result, they are extremely large and bulky and consume many more watts of electrical power than necessary. Such rechargeable electrical devices, include electronic devices and include for example, computing devices, mobile telephones, power tools and home appliances.

According to the present invention there is provided a mains powered battery charger suitable for charging a rechargeable electrical device, comprising an audio alarm which sounds when the charging device is connected to a mains electricity supply and is not charging. The audio alarm may sound for the entire time the charger is not charging and yet is still connected to the mains electricity supply. In a preferred embodiment, when the charger is not charging the audio alarm may only be deactivated by disconnecting the charger from such a mains electricity supply. Thus, when the charger is not charging, the audio alarm alerts a user to switch off the mains electricity supply to the charger. This provides a significant saving of electricity. The rechargeable electrical device may comprise at least one rechargeable battery which is/are charged by the charger.

The audio alarm may sound when the charger is not charging only during a period in which charging current is not being supplied by the charger to a rechargeable device. Alternatively or additionally, the audio alarm may sound when the charger is not charging only during a period in which such a rechargeable electrical device is electrically disconnected from the charger. The charger may comprise a transformer, for example a linear transformer, for transforming an AC mains current to a DC charging current.

The charger may additionally comprise control electronics for controlling DC charging current output from the charger. For example, the control electronics may sense the amount of charge on the battery or batteries being charged and control the charging current accordingly.

The control electronics may also control the audio alarm. In this case the control electronics may sense whether DC charging current is being supplied by the charger and if current is being supplied the control electronics may deactivate the audio alarm and if current is not being supplied may activate the alarm. Alternatively or additionally, the control electronics may sense whether there is an electrical connection between the charger and such an electrical device and if an electrical connection is detected the control electronics may deactivate the alarm and if an electrical connection is not detected may activate the alarm.

The charger may be permanently or releasably connected via a cable to an electrical mains plug, which plug can be connected to a socket of a mains electricity supply. Also, the charger may integrated into a single housing with such an electrical plug.

The invention will now be described by way of example only and with reference to the accompanying schematic drawings, wherein: Figure 1 shows a battery charger according to the present invention connected to a mains electricity supply, via an electrical plug and connected to and charging a rechargeable electrical device;

Figure 2 shows a battery charger according to the present invention connected to a mains supply, via an electrical plug and disconnected from a rechargeable electrical device;

Figure 3 shows a block diagram of components within the battery charger of

Figures 1 and 2;

Figure 4 shows a battery charger of the type described in relation to Figures 1 to 3 integrated into the same housing as an electrical mains plug.

The battery charger (2) shown in Figures 1 and 2 is electrically connected via a cable (4) and an electrical plug (6) to a mains electricity supply. The electrical plug (6) is plugged into a mains socket (8) and the switch (9) for the socket is switched to the on-position. The battery charger (2) includes a transformer (32) (see Figure 3), for example a conventional linear transformer, which receives an AC electricity supply from the mains via an input (34) and converts it to a low voltage DC charging current supplied via an output (36). The low voltage DC charging current is output from the battery charger (2) via a cable (10), the end of which is terminated by an electrical connector (12).

An electrical device (14), for example a mobile phone, which is powered by a rechargeable battery or a bank of rechargeable batteries (16) can be charged by the battery charger (2). To charge the electrical device (14), the battery or batteries (16) are electrically connected to the charger (2) via, the cable (10). In order to do this, the connector (12) of the cable (10) is connected to a charging port (20) of the electrical device (14).

The battery charger (2) also includes control electronics (30) (See Figure 3) for controlling the DC charging current supplied by the battery charger (2) and for sensing when the battery or batteries (16) being charged are fully charged, in which case the control electronics (30) cuts off the charging current from the output electrical cable (10). The control electronics (30) may also perform other functions. The control electronics activates light emitting diodes (LEDs) (22, 24). During a period in which the battery charger (2) is charging a battery or batteries (16), ie. when charging current is being supplied to the battery or batteries (16), the control electronics (30) actuates a green LED (22) to indicate to a user that the electrical device (14) is being charged. If the electrical device (14) is fully charged or is disconnected (see Figure 2) from the battery charger (2) so that no charging current is being supplied to the battery or batteries (16), the control electronics (30) actuates a red LED (24) to indicate to a user that the charger (2) is not charging.

To save electricity, when the red LED (24) is lit, the mains supply of electricity can be switched off, for example by switching the switch (9) on the mains socket (8) to the off position.

In order to remind a user to switch off the mains supply, the battery charger (2) includes an audio alarm (38) located behind a grill (40) in the housing of the charger (2). The audio alarm (38) is also controlled by the control electronics (30), so that when a charging current is being supplied by the charger (2) the control electronics (30) switches off the audio alarm (38). However, when no charging current is being supplied by the charger, for example because the battery or batteries (16) of the electrical device (14) are fully charged, or because the electrical device (14) is disconnected from the charger (2) the control electronics (30) activate the audio alarm (38). The audio alarm (38) alerts a user to the waste of electricity and the alarm is stopped when a user switches off the mains supply to the battery charger (2).

In an alternative embodiment, the control electronics (30) sense disconnection of the electrical device (14) from the battery charger (2), due to disconnection of the connecter (12) from the charging port (20) of the device (14) and only actuates the alarm (38) when the electrical device (14) is disconnected from the charger (2). The audio alarm (38) alerts a user to the waste of electricity and the alarm is stopped when a user switches off the mains supply to the battery charger (2).

The battery charger (2) may be permanently or releasably connected to the plug (6) via the cable (4), as shown in Figures 1 and 2. Alternatively, the battery charger (2) and the electrical plug (6) can be integrated into a single housing, so removing the requirement for the electrical cable (4), as shown in Figure 4. In Figure 4, like parts are identified by like numerals to the earlier Figures.

Claims

1. A mains powered battery charger suitable for charging a rechargeable electrical device, comprising an audio alarm which sounds when the charging device is powered by a mains electricity supply and is not charging.
2. A charger according to claim 1 wherein the audio alarm sounds when the charger is not charging during a period in which charging current is not supplied by the charger and the alarm.
3. A charger according to claim 1 or claim 2 wherein the audio alarm sounds when the charger is not charging during a period in which such a rechargeable electrical device is electrically disconnected from the charger.
4. A charger according to any one of the preceding claims comprising a transformer for transforming an AC mains current to a DC charging current.
5. A charger according to any one of the preceding claims additionally comprising control electronics for controlling DC charging current output from the charger.
6. A charger according to claim 5 wherein the control electronics also control the audio alarm.
7. A charger according to claim 6 when dependent on claim 2 wherein the control electronics senses whether DC charging current is being supplied by the charger and if current is being supplied deactivates the audio alarm and if current is not being supplied activates the alarm.
8. A charger according to claim 6 when dependent on claim 3 wherein the control electronics senses whether there is an electrical connection between the charger and such a rechargeable electrical device and if an electrical connection is detected deactivates the alarm and if an electrical connection is not detected activates the alarm.
9. A charger according to any one of the preceding claims wherein the charger is integrated with an electrical plug.
PCT/GB2007/002348 2006-06-26 2007-06-22 Battery charger WO2008001052A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0612541.3 2006-06-26
GB0612541A GB0612541D0 (en) 2006-06-28 2006-06-28 Battery charger

Publications (1)

Publication Number Publication Date
WO2008001052A1 true true WO2008001052A1 (en) 2008-01-03

Family

ID=36803825

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2007/002348 WO2008001052A1 (en) 2006-06-26 2007-06-22 Battery charger

Country Status (2)

Country Link
GB (1) GB0612541D0 (en)
WO (1) WO2008001052A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2448330A (en) * 2007-04-11 2008-10-15 Gopinath Patel Mobile phone charger unit incorporating an automatic cut off timer
WO2011112220A1 (en) * 2010-08-30 2011-09-15 Brian Tedesco Charger loss prevention adaptor
GB2474244B (en) * 2009-10-07 2014-04-02 Nigel Anthony Beamish Electric charger for vehicle batteries

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5479486A (en) * 1993-03-15 1995-12-26 Rohm Co., Ltd. Cordless telephone set having a warning signal representing that a storage battery is not being charged
US5628641A (en) * 1994-02-24 1997-05-13 Asian Micro Sources, Inc. Collapsible plug device for battery charger
US6373229B1 (en) * 2001-03-23 2002-04-16 Lucent Technologies Inc. Battery charging system for portable electronic devices
US6429625B1 (en) * 2001-05-18 2002-08-06 Palm, Inc. Method and apparatus for indicating battery charge status
US20040257043A1 (en) * 2002-05-17 2004-12-23 Hiromi Takaoka Secondary cell charger and charging method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5479486A (en) * 1993-03-15 1995-12-26 Rohm Co., Ltd. Cordless telephone set having a warning signal representing that a storage battery is not being charged
US5628641A (en) * 1994-02-24 1997-05-13 Asian Micro Sources, Inc. Collapsible plug device for battery charger
US6373229B1 (en) * 2001-03-23 2002-04-16 Lucent Technologies Inc. Battery charging system for portable electronic devices
US6429625B1 (en) * 2001-05-18 2002-08-06 Palm, Inc. Method and apparatus for indicating battery charge status
US20040257043A1 (en) * 2002-05-17 2004-12-23 Hiromi Takaoka Secondary cell charger and charging method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2448330A (en) * 2007-04-11 2008-10-15 Gopinath Patel Mobile phone charger unit incorporating an automatic cut off timer
GB2448330B (en) * 2007-04-11 2010-06-16 Gopinath Patel Improvements to a mobile phone charger
GB2474244B (en) * 2009-10-07 2014-04-02 Nigel Anthony Beamish Electric charger for vehicle batteries
WO2011112220A1 (en) * 2010-08-30 2011-09-15 Brian Tedesco Charger loss prevention adaptor
CN103109435A (en) * 2010-08-30 2013-05-15 布莱恩·特德斯科 Charger loss prevention adaptor
US8493226B2 (en) 2010-08-30 2013-07-23 Brian Tedesco Battery charger loss prevention adaptor having a notification module
JP2013537008A (en) * 2010-08-30 2013-09-26 テデスコ,ブライアンTEDESCO,Brian Charger loss prevention adapter
US9019103B2 (en) 2010-08-30 2015-04-28 Brian Tedesco Charger loss prevention adaptor

Also Published As

Publication number Publication date Type
GB0612541D0 (en) 2006-08-02 grant

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