AU2016247121B2 - Power Charger - Google Patents

Abstract

An electrical power device comprising a Universal Serial Bus (USB) connector configured to be incorporated into a 5 power plate; a transformer configured to receive input power and to provide output power; and a power cable arrangement to provide the output power from the transformer to the USB connector, the power cable arrangement including at least one cable coupling to 10 enable the connection to be made between the transformer and the USB connector by the power cable arrangement. 1/14 g \X IMEMER 11 IN M IN I INS IMMEN 110 IN I IMMER, M IK ...... IME MEEM, LU I .., .................... .................................. >MM .............................. ....................................... ................. IK LL INOMMIX ON I \\\\\X \010 EMEN ............. .............. ............. .............. ............. 0\0 .......... .......... .......... .......... IMMEN

Description

1/14

g \X

IMEMER

11 IN M IN I INS IMMEN 110 I IN IMMER,

M IK ......

MEEM, LU IME I ..,.................... .................................. .............................. >MM ....................................... ................. INOMMIX LL IK ON \010 I \ \ \X

EMEN

............. .............. ............. .............. ............. 0\0 .......... .......... .......... ..........

IMMEN POWER CHARGER

The present invention relates to a power charger and, in particular, to a power charger for a mobile device.

Recently, mobile devices have increasingly used Universal Serial Bus (USB) connections to connect to power supplies for charging and powering purposes. USB is particularly attractive for mobile devices since the connector includes power contacts, to charge and power the device, and also data contacts, to transfer data between the mobile device and the unit to which it is connected, for example a laptop computer.

There are two main types of USB ports for charging or powering devices via USB. The first of these is a Charging Downstream Port (CDP). CDP supports data transfer as well as carrying power. In order not to interfere with high speed data transfer, typically, CDPs limit the current on the power contacts to around 900mA during data transfer. The second type of USB charging port is a Dedicated Charging Port (DCP). Dedicated Charging Ports only provide power and do not carry data. DCPs can provide larger current across the power contacts due to the fact that no data is being transferred and so interference is not a problem. DCPs can provide current of up to 2000mA. Higher current allows the batteries of the device to charge more quickly.

With mobile devices continually including more power hungry applications, access to charging points and speed of charging is becoming important. Long recharge periods may be acceptable to consumers in certain situations, for example where the device can recharge overnight, but if a consumer needs to recharge a device during the day he will require the recharge to take place quickly. Consequently,

1 17698471_1 higher current is becoming increasingly import and DCPs are becoming more attractive for recharge purposes.

Summary of the Invention In accordance with a first aspect of the present invention, there is provided an electrical power device comprising: a Universal Serial Bus (USB) connector configured to be incorporated into a power plate; a transformer configured to receive input power and to provide output power; a power cable arrangement to provide the output power from the transformer to the USB connector, the power cable arrangement including at least one cable coupling, said at least one cable coupling comprising first and second connectors configured to form a mating connection, to enable a releasable connection to be made between the transformer and the USB connector by the power cable arrangement, to provide flexibility in an installation location of the transformer with respect to said USB connector and said power plate.

In an embodiment the releasable connection between the transformer and the USB connector by the power cable is made during installation of the power device.

In an embodiment the at least one cable coupling is provided intermediate the cable of the power cable arrangement.

In an embodiment the at least one cable coupling is provided at the USB connector or transformer.

In an embodiment the coupling comprises at least one connector configured to connect the USB connector to the transformer.

2

17698471_1

In an embodiment, in at least one of the first and second connectors is disposed at an end of a cable section of the cable of the power cable arrangement.

In an embodiment the at least one cable coupling is a releasable coupling.

In an embodiment the coupling comprises a locking arrangement which interlocks the first and second connection.

In an embodiment the power cable arrangement comprises: a first power cable connected to the USB connector, comprising a first connector configured to receive power for delivery to the USB connector; a second power cable connected to the transformer, comprising a second connector adapted to deliver power to the USB connector; wherein the first and second connectors are complementary and configured to form a mating connection.

In an embodiment the power cable arrangement comprises a third power cable having third and fourth connectors, the third power cable configured to be connected between the first power cable and the second power cable by the third and fourth connectors.

In an embodiment the power cable arrangement is suitable to fit through an aperture in a fire box.

In an embodiment the USB connector comprising a clipping arrangement for engagement with a power plate.

In an embodiment at least one cable coupling comprises connectors having a male and female mating arrangement.

3 17698471_1

In an embodiment the transformer comprising a power input, the power input configured to be connected to mains wiring.

In an embodiment the transformer is configured to convert received input power to an output power level suitable for charging a device via a USB receptacle.

In a second aspect the invention provides an electrical power system comprising: a power plate; at least one Universal Serial Bus (USB) connector configured to be incorporated into the power plate; a transformer configured to receive input power and to provide output power to the USB connector; a power cable arrangement to provide the output power from the transformer to the USB connector, the power cable arrangement including at least one cable coupling, said at least one cable coupling comprising first and second connectors configured to form a mating connection, to enable a releasable connection to be made between the transformer and the USB connector by the power cable arrangement, to provide flexibility in an installation location of the transformer with respect to said USB connector and said power plate.

In a third aspect the invention provides an electrical power system comprising: a power plate, the power plate comprising a USB connector having at least one USB receptacle; a transformer configured to receive input power and to provide output power to the USB connector; a power cable arrangement to provide the output power from the transformer to the USB connector, the power cable arrangement including at least one cable coupling, said at

4 17698471_1 least one cable coupling comprising first and second connectors configured to form a mating connection, to enable a releasable connection to be made between the transformer and the USB connector by the power cable arrangement, to provide flexibility in an installation location of the transformer with respect to said USB connector and said power plate.

In a fourth aspect the invention provides a method for delivering power to a USB receptacle on a power plate comprising the steps of; connecting at least one Universal Serial Bus receptacle to a power plate; connecting a transformer input to mains wiring; and connecting a transformer output to the at least one Universal Serial Bus receptacle using a power cable arrangement, wherein the power cable arrangement provides the output power from the transformer to the USB connector, the power cable arrangement including at least one cable coupling, said at least one cable coupling comprising first and second connectors configured to form a mating connection, to enable a releasable connection to be made between the transformer and the USB connector by the power cable arrangement, to provide flexibility in an installation location of the transformer with respect to said USB connector and said power plate.

In an embodiment the connection between the transformer and the USB connector by the power cable is made during installation of the power device.

In an embodiment the connection between the transformer and the USB connector by the power cable is made during installation of the power device.

Description of the Drawings

5 17698471_1

The present invention will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a first embodiment of a twin USB charger in accordance with an embodiment of the present invention; Figure 2 is a face view of the connector showing the twin USB receptacles; Figure 3 shows the face of a double power socket incorporating a twin USB receptacle in accordance with an embodiment of the present invention; Figure 4 shows the USB charger unit installed and connected to a device for charging; and Figure 5 shows the components of a USB power charger in accordance with an embodiment of the present invention. Figure 6 shows connections to a general power output wall plate. Figure 7 shows connections to a general power output wall plate. Figure 8 illustrates an embodiment of cabling arrangement for USB connector. Figure 9 illustrates cabling arrangement for a USB connector installed within a power plate. Figure 10 shows the components of a cabling arrangement for a USB connector in combination with a GPO power plate, wall plate and USB transformer. Figure 11 illustrates an installed USB connector. Figure 12 is an embodiment of an installation for a USB connector. Figure 13 is an illustration of an installed USB connector. Figure 14 illustrates an extension lead for a USB connector.

Description Referring to the drawings, there is shown a terminating

6 17698471_1 unit 10 for connection to a mains power supply. The mains power supply may be the power supply installed in a residence or office and, typically, will be provided with a live, neutral and earth connection within standard rating cabling. The terminating block 10 houses a transformer to convert the voltage and current of the mains supply to that suitable for charging mobile device via USB. Transformer 20 (shown in Figure 5) is housed within the terminating block 10. The terminating block 10 includes a wiring connection block 30 to facilitate connection from the mains wiring to the transformer.

The terminating unit has a power output 40 for providing power to USB connector 60. The power leads contained within cable 50 are connected to the output of the transformer 20. Cable 50 is connected to a twin USB connector 60. The twin USB connector includes two USB receptacles 62 and 64 shown in Figure 2.

The terminating unit is preferably made from heat resistant plastic in order to safely manage and contain heat generated by the transformer.

The terminating unit is designed with a suitable form factor to allow connection onto a surface or to be contained within a wall cavity. For example, embodiments may include receptacles for fastening means, for example screws, to provide attachment of the terminating unit to a surface.

In further embodiments, the terminating connections 30 may be contained within the terminating unit in order that the connections between the mains cabling and the transformer are contained within the terminating unit. Such embodiments are particularly advantageous because no wiring is left exposed which increases the safety of the

7 17698471_1 unit.

The output from the transformer can be selected in dependence on the power delivery requirements for various devices. Preferably, in order to provide power for devices through a USB the power output from the transformer is provided in the form of a 5 volt output and a current of 2000mA. In the embodiment of Figure 1, the power output from the transformer is split to provide two USB power connections via USB receptacles 62 and 64 within connection unit 60.

The form factor of USB connector 60 is suitable to be incorporated into a power socket plate. Figure 3 shows a standard power socket plate 310 incorporating twin USB receptacles.

In the embodiment of Figure 3, the plate is configured to simultaneously receive two separate power plugs at power connections 320, 310 along with two separate USB plugs USB connector 360. On the reverse side of the plate, the USB connector 360 does not interfere with the wiring into the power connectors 320, 310 due to its small form factor. Instead, simply USB connector 360 and USB cabling 50 protrudes from the rear side of the plate to the larger terminating unit including the transformer. This configuration enables the terminating unit and transformer to be located sufficiently far from the plate so as not to interfere with any of the cabling or connections to the plate itself.

The embodiments of the invention facilitate easy and safe installation since there is no exposed wiring at the reverse side of the plate for the USB power charger and no electrical connections are made to the power plate for the USB connections, these are made within the USB connector

8 17698471_1 and completed before presenting the connector to the plate. Instead the connector is simply fitted into the plate. All electrical connections to the USB receptacles are pre-connected and housed within the USB connector.

Additionally, the terminating unit contains any heat generated from the transformer so as not to interfere with any other components or wiring for the power plate.

Figure 4 shows a representative example of an embodiment of the USB power charger installed into a wall cavity and connected to a power plate. The transformer is correctly configured to convert mains power specifications to USB power specifications. In installation, the engineer can pull the mains power lead 405 through wall cavity 420 and connect the mains power cables to the terminating block housing the transformer. Preferably, terminating unit 410 and transformer are pre-connected to the USB connector 440. Once the connection between the mains and the transformer are made, the USB connector 440 is fixed into the power plate 430. The terminating unit 410 is then fed through the wall cavity 420 and fixed in position using attachments. Power plate is fixed over the wall cavity as usual.

As shown in Figure 4, devices can be connected to the USB connectors on the power plate. It is clear from Figure 4 that the terminating unit is located remotely from USB connector. Since the terminating unit is remote from the USB connector it does not interfere structurally with any power plate wiring. Instead, the USB connector connects directly to the power plate.

In typical embodiments of the invention the cabling 50 has sufficient length to enable the transformer to be placed away from the power plate and attached to a surface.

9 17698471_1

Typical lengths for cables are around 30 cm.

Figure 6 shows a further embodiment of a USB connector connected to a power plate. In Figure 6 the USB connector is connected to double general power output (GPO) plate 600. The GPO includes a receptacle 610 for receiving USB connector 620. In Figure 6b USB connector 620 is inserted into the receptacle of power plate 600. In the embodiment of figure 6b USB connector 620 includes a clipping mechanism to retain USB connector in the receptacle. Alternatively, other attachment mechanisms could be used for attaching the USB connector to double GPO plate 600.

Figure 6c shows the power connections in and out of the double GPO plate 600. Mains wiring 630 is terminated onto terminals 602 604 602 on the rear side of double GPO plate 600. Power to USB transformer 640, housed within housing 640, is provided from double GPO plate 600. The Active (live) wire 632 from mains wiring is connected to Active terminal 602 on the rear side of double GPO plate 600. The Neutral wire 634 from mains wiring is connected to Neutral terminal 604 on the rear side of the double GPO plate 600. The Earth wire 636 from the mains wiring is connected to the Earth terminal 606 on the rear side of double GPO plate 600.

USB transformer is housed within housing 640. USB transformer includes active input provided by active wire 642 and a neutral input provided by neutral wire 644. The active wire 642 and neutral wire 644 are contained within cabling 660. In the embodiment of Figure 6, the active wire 642 and neutral wire 644 are terminated to the transformer within transformer housing 640.

To provide mains power input to the transformer active wire 642 is connected to active terminal 602 on the double

10 17698471_1

GPO plate 600 and neutral wire 644 is connected to neutral terminal 604 on the double GPO plate 600. Mains power at 230 V is routed from the double GPO plate terminals 602 604 to the transformer and converted to deliver 2.1 mA at 5V to each USB receptacle contained within USB connector 620.

As discussed above, by positioning transformer away from double GPO plate 600, any heat dissipation in the transformer is located away from the double GPO plate. Additionally, by positioning the transformer away from the double GPO plate there are fewer restrictions on the physical size of the transformer. Larger transformers can be utilised to deliver larger power outputs.

Cable tie 650 attached to transformer housing 640 is attached to mains wiring 630 after electrical connections to the terminals of the double GPO plate 600 have been completed. Cable tie 650 is plastic but may also be manufactured from any other suitable material. Alternatively the cable tie may be in the form of a clip or hook or any other form suitable for attaching the transformer housing to mains wiring 630.

The cable of mains wiring 630 is thermoplastic sheathed cable (TPS cable) which is typically thicker and stiffer than USB cabling 660. By attaching transformer housing 640 to the mains wiring 630 the mains wiring supports the weight of the transformer without providing undue strain on the electrical connections to double GPO plate 600.

During installation mains wiring 630 is pulled through the wall 670 to facilitate connection of the mains active neutral and earth wires 632 634 636 and transformer power wires 642 644 onto double GPO plate 600.

11 17698471_1

In alternative embodiments the transformer housing 640 is attached to the inside of wall 670 or positioned elsewhere within the wall cavity. Screws or other suitable attachment means can be used to attach transformer housing 640 to the wall.

After power connections to and from terminals 602 604 606 of double GPO plate 600 are complete and USB connector 620 is inserted into double GPO plate 600, transformer housing 640 is fed into the wall cavity and double GPO plate 600 is surface mounted to wall 670 using screws or other attachment means as shown in Figure 6e.

Transformer housing 640 is sized within the dimensions of double GPO plate 600 to allow it to pass into the all cavity. After installation transformer 640 hangs in the wall cavity behind wall 670 supported by cable tie 650 and mains wiring as shown in Figure 8. Transformer is positioned away from double GPO plate 600 to prevent heat dissipation from the transformer in the vicinity of the double GPO plate.

In further embodiments the USB connector and USB receptacles are integral with double GPO plate 600. In such embodiments the connections to and from the USB transformer is prewired to double GPO plate terminals 602 604 and the USB connector 620. Such embodiments remove the requirement for the USB connector to be manually inserted into the double GPO plate 600 during installation. Additionally, there is no need to connect the USB transformer wires 642 644 to the terminals 602 604 of the double GPO plate 600 during installation. Such embodiments have similar cable lengths to the separate system to provide heat dissipation within the transformer away from the front plate.

12 17698471_1

Figure 7 shows an alternative embodiment of installation of the USB transformer. In the embodiment of Figure 7 mains wiring 710 carrying power at mains specifications, typically at 230 Volts is split at 715. One leg of the split mains wiring is routed to USB transformer within transformer housing 720. USB transformer converts the power input from mains power to 2.1 A at 5 V for connection to twin USB receptacles in connector 730. Output 725 from USB transformer is routed to USB connector 730 on double GPO plate 740. Transformer housing 720 is designed to contain heat dissipated from the transformer, as discussed above. USB connector 730 is inserted into double GPO plate 740.

The second leg 745 of the split mains wiring is routed directly to double GPO plate 740. Second leg 745 provides power at mains specifications to two three pin power outputs of double GPO plate 740.

In the embodiments above, the power plates are double General Power Output (GPO) plates. However, further embodiments include any electrical accessory plate to which mains wiring is terminated and into which USB receptacles are provided. For example, in further embodiments the power plate is a lighting plate incorporating a switch for controlling lighting units. In a further embodiment the power plate is a designated USB plate including USB receptacles.

The mains wiring is wiring installed within a premises and maintained within the walls, ceilings and floors of the premises. Typically mains wiring is connected to the rear side of surface mounted electrical devices including power plates including GPO plates, lighting plates, switch plates or other electrical devices. Mains wiring carries power at mains power specifications, typically 220 - 240

13 17698471_1

Volts or 110 to 130 Volts depending on location.

Figures 8-14 illustrate a further embodiment of the USB connector in cooperation with a double General Power Outlet (GPO) plate. The embodiments of Figures 8 to 14 include a power cable arrangement 890 which includes a coupling to enable the connection between the transformer and the USB connector to be made. In the embodiment of Figure 8 the coupling is a releasable coupling to couple and decouple the USB connector and the transformer.

In the embodiment of figure 8, USB connector 820 is configured to be received within receptacle 810 of double GPO plate 830. The USB connector includes a clipping mechanism 822 which engages with a corresponding clipping arrangement 812 of double GPO plate 830. The interaction of clipping mechanism 822 with 832 enable the USB connector to be retained within receptacle 810 of double GPO plate 830 after insertion. The clipping arrangement between clipping mechanism 822 and 832 enables the USB connector to be decoupled from double GPO plate 830 upon release of the clipping mechanism.

In the example of figure 8, USB connector 820 include two USB receptacles on the face of the USB connector which engages the double GPO plate 830 (not shown). When USB connector is fully received within receptacle 810 the USB power ports are accessible via the front face 835 of double GPO plate 830.

Electrical power is delivered to the USB power ports within USB connector 820 via USB transformer 840. As discussed above in relation to previous embodiments USB transformer 840 is contained within transformer housing 845 and converts power from mains power specifications to USB power specifications. In the example of figure 8 USB

14 17698471_1 transformer to 840 converts mains power of 230 volts to USB power output levels of 2.1 amps at 5 volts for each of the UBS ports in USB connector 820.

In the example of figure 8, electrical power is carried from the transformer USB transformer 840 to USB connector 820 via cabling arranging 890. Cabling arrangement 890 include a first power output cable 850 connected to USB transformer 840. A first end of power output cable 850 is connected to USB transformer to receive output power from USB transformer 840. A second end of power output cable 850 is attached to a power connector 880. Power connector 880 is a power plug. The second portion of cabling arrangement 890 includes a power input cable attached to USB connector 820. A first end of power input cable 860 is terminated at USB connector 820. A second end of power input cable 860 is attached to power connector 870. Power connector 870 is a power plug. Power plugs 870 and 880 are complimentary and configured to form a mating connection. When connected they provide a power connection between USB transformer 840 and USB connector 820. In the example of figure 8 power plugs 870 and 880 include quick connect mechanisms in order to facilitate a simple connection between the power plugs. Preferably, the plugs include a clipping mechanism which is activated on aligning the plugs for engagement. The clipping mechanism of plugs 870 and 880 is released upon deactivation of the clipping mechanism in order to break the power connection between USB transformer 840 and USB connector 820. Power plugs 870 880 provide a coupling.

Figure 9 illustrates the position of USB connector 820 when received into double GPO plate 830. In this arrangement clipping mechanisms 822, 832 are engaged and USB connector is clipped into position within GPO plate 830.

15 17698471_1

An advantage provided by embodiments including connectable power connectors within the cabling arrangements between the USB transformer 840 and USB connector 820 is that flexibility is provided in the physical configurations in which the USB connector can be incorporated into GPO plates. In particular, the embodiment of figure 10 illustrates how the cabling arrangement 890 interacts with a metal wall box 1000. Many jurisdictions require wall boxes such as fire box 1000 illustrates that in figure 10 to be installed into wall cavities to receive GPO plate 1030 as shown in figure 10. Fire box 1000 includes limited space and is generally contained except for a few apertures within the rear face suitable for receiving cables. Figure 11 illustrates apertures 1102 and 1104 within fire box 1100. The flexible cabling arrangement including power plugs 1070 and 1080 as illustrated in figure 10 allows transformer 1040 to be installed into the mains wiring before fire box 1000 is inserted into the wall. Power output cable 1050 from transformer 1040 can then be inserted through an aperture of wall box 1000. Power plug 1080 can then be connected with power plug 1070 before fixing plate 1030 to wall box 1000. This installation arrangement avoids complicated wiring between transformer 1040 and the GPO plate.

Figure 10 illustrates the connection components of power plug 1080. Power plug 1080 connected to power output cable 1050 includes male connector 1082. Upon connection of power plug 1080 to power plug 1070 male connector 1082 is received by female connector 1072 (not shown in figure 10) to complete the electrical connection between USB transformer 1040 and the USB inserted into GPO power plate 1030. As discussed above, power plugs 1080, 1070 also include a releasable clipping mechanism to maintain connection between the power plugs after connection.

16 17698471_1

Further embodiments of the invention provide additional flexibility on the positioning of USB transformer 1040 with respect to GPO plate 1030 by using extension leads between power plugs 880 and 870. It will be clear to those skilled in the art that extension lead having a female connector at a first end and a male connector at the second end could be used to extend the distance between USB transformer and GPO power plate. An example of an extension cable is illustrated in figure 14. An example of use of a power cable may be, for example, if a USB transformer is positioned within a ceiling cavity and an extension lead is used to run the power output cable from the USB transformer to the GPO plate, which may be located towards ground level on the wall. Extension cables of any suitable length can be provided in order to provide suitable coverage.

The example of figure 11 shows an embodiment in which mains wiring 110 is wired directly onto the terminals of GPO plate 1130. Mains wiring 110 includes neutral wire 1112, earth wire 1114 and live wire 1116. The wires are connected into the rear side of GPO plate 1130. Transformer 1140 is connected to mains wiring 110 via GPO plate 1130 and the cable from GPO plate 1130 to USB transformer 1140 is shown as 1150. In the example of figure 11 the transformer is positioned behind wall plate 110 and the power cable between GPO plate 1130 and transformer or only USB transformer 1140 is fed through aperture 102 of wall plate 1100. The power output cable 1150 from USB transformer 1140 is also fed through aperture 1102 and terminated with power plug 1180. USB connector 1120 is shown inserted into GPO plate 1130 in figure 11. The power input cable 1160 to USB connector 1120 has power plug 1170 connected to it.

17 17698471_1

Power is provided to USB connector 1120 by connecting power plugs 1170 to 1180. As shown in figure 11, power plug 1180 includes male connector portion 1182 and power plug 1170 includes female connector portion 1172. The connection portion in figure 11 clipping protrusions 1184 are shown and arranged to be received by a female connector portion 1172 and housed within clipping apertures 1174. The inset of figure 11 shows the power plugs in a connected position. To decouple the power plugs clipping protrusions 1184 are squeezed together from their housed positions within clipping aperture 1170 to release the clipping engagement between the plugs and the power plugs can then be pulled apart.

Figure 12 and 13 show a further electrical connector arrangement using a cabling arrangement to provide power to USB connector 1220 which include an extension power lead 1290. The example of figure 12 mains wiring 1210 is terminated at a junction box 1212. Mains cabling 1210 is split at junction box 1212 with a first leg 1214 routed directly to GPO plate 1230 and second leg 1216 routed to USB transformer 1240. Both legs 1214, 1216 carry power at mains specifications. Power leg 1214 is routed through aperture 1202 of wall box 1200 and terminated directly on GPO plate 1230. Power from power leg 1214 provides power to the twin power outlets of GPO plate 1230.

In the example of figure 12, junction box 1212 and USB transformer 1240 are located in the ceiling section. Typically, these are attached to a ceiling joist or otherwise secured within the ceiling area. The example of figure 12, GPO plate 1230 is positioned on a wall a few meters away from the ceiling section. Hover, this distance could be shorter or longer in other embodiments. In the example of figure 12 extension power cable 1290 is used to carry power from the transformer to the USB

18 17698471_1 connector 1220. Extension lead 1290 includes power plugs 1292, 1294 positioned at either end. Power plugs are arranged to connect with USB transformer power plug 1280 and USB connector power plug 1270. In the example of figure 12, extension lead 1290 is passed through aperture 1202 of wall box 1200 and connected with USB power plug 1270.

Extension lead 1290 is shown in greater detail in figure 14. In order to provide power connections between the power plugs of the USB connector and the USB transformer the power plugs of the extension lead includes a male power plug at one end and a female power plug at the other end.

The clipping arrangements of power plugs is shown clearly in figure 14. In particular, male power plug 1410 includes a central protrusion 1412 and to clipping sections 1414, 1416. Central protrusion 1412 contains all power connections and is arranged to be received within power receiving aperture 1422 on corresponding female power plug. Protrusion sections 1414 and 1416 are received by apertures 1424, 1426 in corresponding female power plug. Female power plug includes apertures 1425 and 1427 (not shown) to receive clipping protrusions 1415 and 1417 respectively. Upon engagement clipping protrusions 1415, 1417 are sprung into a locked position in order to maintain connection between power plugs 1410 and 1420. The power plugs are released by squeezing the protrusions 1415, 1417 together and pulling power plugs apart to release protrusions 1414, 1416 through apertures 1424, 1426.

Figure 13 shows the embodiment of figure 12 when fully installed within a wall. In figure 13, GPO plate 1230 is attached to plasterboard wall 1320. Wall box 1200 is

19 17698471_1 installed into plasterboard wall 1320 within wall cavity 1300. Figure 13 shows mains cable 1214 extending out from wall box 1200 towards the ceiling and towards junction box 1212 shown in figure 12. USB connector cable 1330 also protrudes from wall box 1200. Power plug 1270 from USB connector is shown connected to power plug 1294 connected to extension cable 1290.

Figure 13 illustrates how embodiments of the present invention facilitate easy connection of the USB connector into GPO plate incorporated with a fire box 1200. During installation, initially the mains power cable is split at the ceiling and junction box 1212 and the mains cable is carries power to GPO power plate 1230. During installation, the mains power cable 1214 if pulled through the wall cavity and connected to GPO plate to provide power to put in power plugs or between power outlets. The second power leg from 1216 from junction box 1212 is then directed to transformer 1240 which is also housed in the ceiling section. The power plug 1280 is then connected to the power plug 1292 of extension cable 1290. Power plug 1294 of extension lead 1290 is passed through aperture 1202 of wall plate 1200 before connection to USB connector port power plug 1270. When all connections have been made, wall box 1200 is installed within wall cavity onto plasterboard wall 1320. GPO power plate 1230 is then connected to plasterboard wall 1320 and the connections on the back of GPO power plate are contained within wall box 1200.

Embodiments of the invention incorporating the cabling arrangement between USB transformer and USB connector discussed with respect to figures 8-13 provide simplified and safe installation of USB power connectors into GPO plates. In particular, the power plug arrangements enable the USB transformer and USB connector to be located on

20 17698471_1 either side of a wall box. This enhances the opportunity to provide high power to the USB connector since USB transformer 840 is not required to be located within the wall box. Additionally, power plugs can be designed to be suitable size in order to fit through typical size apertures in wall boxes, which would not otherwise accept the USB transformer or USB connector. Consequently, the sizing constraints of fire box do not prevent high power USB power outputs being provided on GPO plates.

The power plug connection arrangement within the cabling arrangement between the USB transformer and USB connector also facilitates the use of extension power leads positioned between USB transformer and USB connector. This provides great flexibility in the location of the USB transformer with respect to the USB connector and GPO power plate. The use of extension leads enables transformers to be positioned, for example, on ceiling joists or other locations within a building and power port to GPO power plates using an extension lead.

The quick connect power plug arrangements provide easy installation and meet safety requirements for typical power of delivery devices.

Embodiments of the invention provide different wiring configurations or provide different power wiring configurations in delivering power to USB connector. In some embodiments mains power cables are terminated directly onto the GPO plate and the input of the USB transformer is taken from the USB plate to the USB transformer and looped back to the plate via the USB connector. In further embodiments mains power cabling can be split before reaching the plate, and power for regular power plates is delivered separately from the power leg routed directly to the USB connector.

21 17698471_1

In further embodiments the cabling arrangement includes power plugs which connect directly into the USB connector and the transformer.

It will be clear to those skilled in the art that the configuration of embodiments of the present invention provides versatility in terms of the performance and rating of the transformer, the type of USB connectors, and heat and power ratings of the materials. For example, if power capabilities of USB sockets were to increase, further embodiments of the invention could incorporate different transformers or, indeed, different couplings. Additionally, embodiments of the invention provide good control over the materials used in the terminating unit in order to manage different levels of heat or standard requirements of different safety requirements. The cabling between the terminating unit and the USB connector can also be selected as suitable for the installation needs and safety rating requirements of the building. Additionally, the flexibility of the cabling can be selected in order to meet the requirements of the installation.

It will be clear to those skilled in the art that the plugs described not limiting but are exemplary and provide one example of many connector configurations which could be used in couplings in further embodiments of the invention.

It will be clear to those skilled in the art that embodiments of the present invention are not limited to use in USB charging systems. Different connectors for different devices can be incorporated into the connection unit.

22

17698471_1

Many power plates are now produced with a standard size receptacle to receive power connectors or, indeed, to be blocked off. Embodiments of the present invention may include single USB receptacles, twin USB receptacles or any other type of USB receptacle or other power connector.

A further advantage provided by embodiments of the present invention is that the transformer is remote from the connector. This moves the generation of heat from the vicinity of the power plate and USB receptacle which increases the safety of the power plate. By removing the large transformer from the locality of the power plate, embodiments of the invention also removes size restrictions and wiring restrictions from the power plate. This makes installation more straightforward at the plate and also removes any physical interference between the transformer itself and other wiring.

Modifications and variations as would be apparent to a skilled addressee are deemed to be within the scope of the present invention.

23 17698471_1

Claims (19)

Claims:

1. An electrical power device comprising: a Universal Serial Bus (USB) connector configured to be incorporated into a power plate; a transformer configured to receive input power and to provide output power; a power cable arrangement to provide the output power from the transformer to the USB connector, the power cable arrangement including at least one cable coupling, said at least one cable coupling comprising first and second connectors configured to form a mating connection, to enable a releasable connection to be made between the transformer and the USB connector by the power cable arrangement, to provide flexibility in an installation location of the transformer with respect to said USB connector and said power plate.

2. An electrical power device according to claim 1 wherein the releasable connection between the transformer and the USB connector by the power cable is made during installation of the power device.

3. An electrical power device according to either claim 1 or 2 wherein the at least one cable coupling is provided intermediate the cable of the power cable arrangement.

4. An electrical power device according to any one of the preceding claims wherein the at least one cable coupling is provided at the USB connector or transformer.

5. An electrical power device according to any one of the preceding claims, wherein the at least one cable coupling is a releasable coupling.

6. An electrical power device according to any of the

24 17698471_1 preceding claims, wherein in at least one of the first and second connectors is disposed at an end of a cable section of the cable of the power cable arrangement.

7. An electrical power device according to any of the preceding claims, wherein the cable coupling comprises a locking arrangement which interlocks the first and second connection.

8. An electrical power unit according to any one of the preceding claims, wherein the power cable arrangement comprises: a first power cable connected to the USB connector, comprising a first connector configured to receive power for delivery to the USB connector; a second power cable connected to the transformer, comprising a second connector adapted to deliver power to the USB connector; wherein the first and second connectors are complementary and configured to form a mating connection.

9. An electrical power unit according to claim 8, wherein the power cable arrangement comprises a third power cable having third and fourth connectors, the third power cable configured to be connected between the first power cable and the second power cable by the third and fourth connectors.

10. An electrical power unit according to any one of the preceding claims wherein the power cable arrangement is suitable to fit through an aperture in a fire box.

11. An electrical power device according to any one of the preceding claims the USB connector comprising a clipping arrangement for engagement with a power plate.

25 17698471_1

12. An electrical power device according to any one of the preceding claims wherein at least one cable coupling comprises connectors having a male and female mating arrangement.

13. An electrical power device according to any one of the preceding claims, the transformer comprising a power input, the power input configured to be connected to mains wiring.

14. An electrical power device according to any one of the preceding claims wherein the transformer is configured to convert received input power to an output power level suitable for charging a device via a USB receptacle.

15. An electrical power system comprising: a power plate; at least one Universal Serial Bus (USB) connector configured to be incorporated into the power plate; a transformer configured to receive input power and to provide output power to the USB connector; a power cable arrangement to provide the output power from the transformer to the USB connector, the power cable arrangement including at least one cable coupling, said at least one cable coupling comprising first and second connectors configured to form a mating connection, to enable a releasable connection to be made between the transformer and the USB connector by the power cable arrangement, to provide flexibility in an installation location of the transformer with respect to said USB connector and said power plate.

16. An electrical power system comprising: a power plate, the power plate comprising a USB connector having at least one USB receptacle;

26 17698471_1 a transformer configured to receive input power and to provide output power to the USB connector; a power cable arrangement to provide the output power from the transformer to the USB connector, the power cable arrangement including at least one cable coupling, said at least one cable coupling comprising first and second connectors configured to form a mating connection, to enable a releasable connection to be made between the transformer and the USB connector by the power cable arrangement, to provide flexibility in an installation location of the transformer with respect to said USB connector and said power plate.

17. An electrical power system according to claim 16 wherein the connection between the transformer and the USB connector by the power cable is made during installation of the power device.

18. A method for delivering power to a USB receptacle on a power plate comprising the steps of; connecting at least one Universal Serial Bus receptacle to a power plate; connecting a transformer input to mains wiring; and connecting a transformer output to the at least one Universal Serial Bus receptacle using a power cable arrangement, wherein the power cable arrangement provides the output power from the transformer to the USB connector, the power cable arrangement including at least one cable coupling, said at least one cable coupling comprising first and second connectors configured to form a mating connection, to enable a releasable connection to be made between the transformer and the USB connector by the power cable arrangement, to provide flexibility in an installation location of the transformer with respect to said USB connector and said power plate.

27

17698471_1

19. A method according to claim 18 wherein the connection between the transformer and the USB connector by the power cable is made during installation of the power device.

28 17698471_1