AU5590101A - Switching assembly - Google Patents

Description

Regulation 3.2

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION STANDARD PATENT .0.0 0So..

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APPLICANT: WILLIAM STEPHEN JENKIN Invention Title: SWITCHING ASSEMBLY The following statement is a full description of this invention, including the best method of performing it known to me: "SWITCHING ASSEMBLY AND METHOD" Technical Field This invention relates to a switching assembly and method.

The invention has particular but not exclusive application to a method and apparatus to change-over the power supply of a working electrical device without interrupting its operation. The invention has particular application for an electronic device, such as a computer or networking device, where the device is to be connected to a different power outlet without interrupting the normal operation of the equipment.

For illustrative purposes the present invention will be described with reference to re-connecting a computer from the normal electricity supply to a 'UPS' (Uninterruptible Power Supply).

Glossary The following acronyms, abbreviations and terms are used throughout the specification:- UPS Uninterruptible Power Supply SIEC International Electrical Connector SAA Standards Authority Australia Power supply A source of electrical power, such as normal :commercial reticulated 240V AC, a generator, or UPS.

Power lead A length of electrical cable for connecting electrical equipment to a power outlet. It must have a plug attached for connection to power outlets. The other end, if not permanently wired to the equipment, has a socket (such as an IEC) for connection to another lead or a plug permanently wired into the i equipment.

Power outlet A fixture to which the power supply is connected by fixed wiring.

Socket A female electrical connector.

Plug A male electrical connector.

Power Connector Either a male or female connector installed permanently in equipment.

Background of Invention Currently only a very few computing or network devices are available with multiple power supplies and multiple power connectors. For continuous equipment operation, managing the physical environment and power supply becomes important.

In most installations, equipment is being frequently added, moved and removed. All these equipment changes require planning and co-ordination of facilities space, access, cooling, network connections and power outlets. Major installation changes, such as installing or adding a UPS for additional reliability, requires reconnecting the power supply of most or all computing and network devices in an installation. For io those few devices fitted with multiple power supply connectors, this is a trivial matter performed without affecting normal operation. Otherwise, equipment must be shutdown, causing service interruptions requiring careful planning, scheduling, coordination, and considerable extra effort.

FIG 1 schematically illustrates the conventional manner of connecting electrical equipment to a power supply wherein a power lead 40 connects a power outlet 50 to a socket 10 in the equipment.

Summary of Invention The present invention aims to provide an alternative to known switching 20 assemblies and methods.

In one aspect this invention resides broadly in a switching assembly for switching electrical equipment between power supplies external to the equipment and switching assembly, the switching assembly including:first electrical connector means for electrical connection to electrical equipment; 25 second electrical connector means for electrical connection to a first electrical power supply; third electrical connector means for electrical connection to a second electrical power supply, and switching means for switching an electrical connection between the first electrical connector means and the second electrical connector means to and from an electrical connection between the first electrical connector means and the third electrical connector means.

In one preferred embodiment the first electrical connector means is a plug receivable in a socket on the electrical equipment. In this embodiment it is preferred 4 that the second and third electrical connector means are sockets for receiving the plug of a power lead for electrically connecting the switching assembly to an electrical power supply, and that the switching means is manually operable.

In another preferred embodiment the first and second electrical connector means are the plug and socket respectively of a power lead. In this embodiment it is preferred that the third electrical connector means is a socket for receiving the plug of a power lead, and that the switching means is automatically operable upon insertion and withdrawal of a plug into the socket comprising the third electrical connector means.

In another preferred embodiment the first electrical connector means is a socket for receiving the plug of a power lead. In this embodiment the third electrical connector means is a plug for receiving the socket of a power lead, and the switching means is manually operable.

It is preferred that the switching assembly is not fixedly wired to the equipment or the power supplies.

In another aspect this invention resides broadly in a method of switching electrical equipment between power supplies external to the equipment and a switching assembly, the method including:- .connecting first electrical connector means to the electrical equipment; connecting second electrical connector means to a first electrical power supply; providing third electrical connector means for electrical connection to a second S* electrical power supply, and operating switching means to electrically disconnect the first electrical connector means and the second electrical connector means and to electrically connect the first 25 electrical connector means and the third electrical connector means; the first, second and third electrical connector means and the switching means being included in the switching assembly.

Description of Drawings In order that this invention may be more easily understood and put into practical effect, reference will now be made to the accompanying drawings which illustrate a preferred embodiment of the invention, wherein:- FIG 2 is a schematic diagram illustrating a first embodiment of the invention in normal operation; FIG 3 schematically illustrates the steps in the method of change electrical connection of equipment from one power outlet to another; FIG 4 is a wiring diagram functionally illustrating the operation of the switch in FIG 2; FIG 5 is a schematic diagram illustrating a second embodiment of the invention in normal operation, and FIG 6 is a schematic diagram illustrating a third embodiment of the invention in normal operation.

Description of Preferred Embodiment of Invention As seen in FIG 2, plug 15 of the assembly is connected to the power socket of the equipment 12. In normal operation, a power lead 40 connects a power outlet to a socket 30, the switch 20 connects power from the socket 30 to the plug 15 and hence to the equipment 12.

In FIG 3, to change-over to a different power supply (such as a new power outlet, a UPS, or a generator), an additional power lead 60 connects another power -eo outlet 70 to an alternate socket 80. To complete the change-over, the switch 20 is thrown to connect socket 80 to the plug 15, providing power to the equipment 12. The first power lead 40 can be then removed from its socket In the embodiment illustrated in FIG 5, the switching assembly is built into a power lead 18. A power lead 32 can be connected into socket 16 for connection to equipment 12 and a second power lead 33 can be connected to plug 17 for connection to first power supply 50. A housing contains switch 23 and a socket 19 for receiving the plug connector 21 of lead 22. When plug 21 is inserted into socket 19 it operates a plunger to activate switch 23 to disconnect the existing electrical connection between socket 16 and plug 17 and toestablish electrical connection between socket 16 and socket 19 whereby power supply 50 is replaced by power supply In the embodiment illustrated in FIG 6, the switching assembly is embodied in a power distribution board or a power rack 34. Plug 25 of power lead 26 can be connected into socket 24 in power rack 34 for connection to equipment 12 for connection to a first power supply 50. Plug 28 of another power lead 29 can be connected into socket 27 in power rack 34 for connection to a second power supply Power rack 34 contains switch 31 and socket 27 for receiving the plug connector 28 of lead 29. Operation of switch 31 changes connection of equipment 12 via plug to socket 24 between power supply 50 and power supply 70 (via socket 27, plug 28 and lead 29).

The electrical equipment will be capable of withstanding any brief switching time, voltage change, switching transient, or phase change caused by operation of the switch and so in practice the device of the present invention should not be used on equipment sensitive to such minor power supply variations.

The assembly is preferably configured for single phase AC operation and the design of a three phase or DC version will be obvious to persons skilled in the art.

It will be appreciated that specific design will be required to comply to local io standards, registration or safety authority requirements.

For all unit types (DC or AC single or three phase), the 'Earth' lead of the plug and all sockets can be directly connected or switched. All other leads must be individually switched for electrical safety and avoiding hazards when switching between either independent power generators or different phases on the same generator. For DC or AC single phase, this requires a 'double pole double throw' switch as seen in FIG 4 for the two other leads (normally termed 'active' and 'neutral'). The switch must .be of the 'break before make' type.

In a preferred embodiment the power change-over assembly comprises all components in a single or moulded assembly.

20 Thus it will be realised that in all preferred embodiments the switching assembly of the present invention includes first electrical connector means 15 for electrical °connection to electrical equipment 12, second electrical connector means 30 for **a electrical connection to a first electrical power supply 50, third electrical connector means 80 for electrical connection to a second electrical power supply 80, and 25 switching means 20 for switching an electrical connection between the first electrical connector means 15 and the second electrical connector means 30 to and from an a. o, electrical connection between the first electrical connector means 15 and the third electrical connector means In the embodiment illustrated in FIGS 2 and 3, the first electrical connector means 15 is a plug receivable in a socket 10 on the electrical equipment 12. In this embodiment it is preferred that the second and third electrical connector means 30,80 are sockets for receiving the plugs of power lead 40,60 for electrically connecting the switching assembly to electrical power supplies 50,70 and that the switching means is manually operable.

In the embodiment illustrated in FIG 5, the first and second electrical connector means .are the plug 16 and socket 17 respectively of a power lead 18. In this embodiment it is preferred that the third electrical connector means is a socket 19 for receiving the plug 21 of a power lead 22, and that the switching means 23 is operable upon insertion and withdrawal of plug 21 into socket 19 which comprises the third electrical connector means, to switch an electrical connection between plug 16 and socket 17 to an electrical connection between plug 16 and socket 19.

In the embodiment illustrated in FIG 6, the first electrical connector means is a socket 24 for receiving the plug 25 of a power lead 26 and the second electrical connector means is plug 35 for connection to power supply 50. In this embodiment the third electrical connector means is a plug 27 for receiving the socket 28 of a power lead 29. Switching means 31 is manually operable to switch an electrical connection between socket 24 and plug 35 to an electrical connection between socket 24 and plug 27.

It will also be appreciated that in use the method of the present invention switches electrical equipment between power supplies 50 and 70 by connecting first electrical connector means 15 to electrical equipment 12, by connecting second electrical connector means 30 to the first electrical power supply 50, by providing third *.*:electrical connector means 80 for electrical connection to the second electrical power 20 supply 70, and by operating switching means 20 to electrically disconnect the first electrical connector means 15 and the second electrical connector means 30 and to electrically connect the first electrical connector means 20 and the third electrical connector means 80; the first, second and third electrical connector means 15, 30, and the switching means 20 being included in a switching assembly.

25 It will be understood that several features of the various preferred embodiments of switching assembly can readily be varied without departing from the spirit or scope o :of the invention. These include, by way of non-exhaustive example, the type, o orientation or polarisation of the connectors; the position or number and type of switches; whether switching is manual or automatic, and if automatic, whether operation is activated by insertion of a plug in a socket, or by automatic switching upon loss of existing power; the provision of electronic switching; the number of power sockets; the ability to swivel, rotate or move the plug and sockets in relation to each other; whether there are indicators or lights, fuses or similar safety devices, and safety shutters or interlocks; the length or type of any external power lead connecting parts of the assembly; or any requirements incurred by local registration or standards authorities.

In its various embodiments it will be appreciated that the present invention has a number of advantages over known switching assemblies and methods and provides simple method to allow the change-over of power supply to (computer and network) equipment without disrupting normal, continuous operation. Other advantages include the following:- The present invention does not involve or require a fixed installation.

The present invention is not part of the equipment per se and does not require the provision of battery backup power.

The present invention, not being a UPS, avoids the disadvantages associated with these.

Electrical equipment, such as computers and network devices can continue to function normally whilst they are connected to a different source of electrical power.

The present invention allows for quick, simple connection of electrical equipment to an alternate power outlet.

The present invention is supplied as a complete operating unit with no specialist installation or safety requirements. Operation of the unit requires no additional safety steps or training and is performed by non specialist staff.

20 The present invention allows electronic equipment, such as computers or network devices, to operate normally during a change of power source without S• affecting normal operation.

Whilst some computers or network devices may be supplied with redundant, even removable power supplies, often the manufacturers provide only one power 25 socket hence requiring the equipment tobe shutdown to change power outlets.

It will of course be realised that whilst the above has been given by way of an illustrative example of this invention, all such and other modifications and variations S"hereto, as would be apparent to persons skilled in the art, are deemed to fall within the broad scope and ambit of this invention as is herein set forth.

Claims (11)

1. A switching assembly for switching electrical equipment between power supplies external to the equipment and switching assembly, the switching assembly including:- first electrical connector means for electrical connection to electrical equipment; second electrical connector means for electrical connection to a first electrical power supply; third electrical connector means for electrical connection to a second electrical io power supply, and switching means for switching an electrical connection between the first electrical connector means and the second electrical connector means to and from an electrical connection between the first electrical connector means and the third electrical connector means.

2. A switching assembly as claimed in claim 1, wherein the first electrical connector means is a plug receivable in a socket on the electrical equipment. S0 3. A switching assembly as claimed in claim 2, wherein the second and 20 third electrical connector means are sockets for receiving the plug of a power lead for electrically connecting the switching assembly to an electrical power supply.

4. A switching assembly as claimed in claim 3, wherein the switching means is manually operable. 00.0 A switching assembly as claimed in claim 1, wherein the first and second electrical connector means are the plug and socket respectively of a power lead. ee .0

6. A switching assembly as claimed in claim 5, wherein the third electrical 3o connector means is a socket for receiving the plug of a power lead.

7. A switching assembly as claimed in claim 6, wherein the switching means is automatically operable upon insertion and withdrawal of a plug into the socket comprising the third electrical connector means.

8. A switching assembly as claimed in claim 1, wherein the first electrical connector means is a socket for receiving the plug of a power lead.

9. A switching assembly as claimed in claim 8, wherein the third electrical connector means is a plug for receiving the socket of a power lead. A switching assembly as claimed in claim 9, wherein the switching means is manually operable.

11. A switching assembly as claimed in claim 1, wherein the switching assembly is not fixedly wired to the equipment or the power supplies.

12. A method of switching electrical equipment between power supplies external to the equipment and a switching assembly, the method including:- connecting first electrical connector means to the electrical equipment; connecting second electrical connector means to a first electrical power supply; providing third electrical connector means for electrical connection to a second l*'a Selectrical power supply, and operating switching means to electrically disconnect the first electrical connector means and the second electrical connector means and to electrically connect the first electrical connector means and the third electrical connector means; the first, second and third electrical connector means and the switching means being included in the switching assembly. :°°llO

13. A method of switching electrical equipment between power supplies substantially as described with reference to the drawings.

14. A switching assembly substantially as described with reference to the drawings. WILLIAM STEPHEN JENKIN by PIZZEYS PATENT AND TRADE MARK ATTORNEYS