Claims:
1. A sensing assembly comprises:
a Ring shaped Flux Concentrator Material fitted with current conducting wire;
a sensing element with air gap;
a connection for Phase incomingPhase outgoing;
asensing circuit output which is connected in order to trigger a selector circuit configured for switching an Emergency Lighting System.
2. The sensing assembly as claimed in claim 1, wherein sensing circuit is connected the input ac mains side.
3. The sensing assembly as claimed in claim 1 wherein during operation, when the ac main is available, it will power up the battery charging circuit and will charge the battery, at the same time it is an input for the Constant current driver circuit which will give the dc output.
4. The sensing assembly as claimed in claim 1 wherein there is no direct wired contact between the primary alternating signalling component and the sensing circuit.

5. The sensing assembly as claimed in claim 1 wherein the assembly is configured forcontact free operation to detect the presence of alternating signal without using any moving parts to open or close the contacts.
6. The sensing assembly as claimed in claim 1 wherein sensing circuit is configured for sensing the absence of ac signal as well as internal failure of the driver subsystem and can ultimately trigger to power the LEDs by battery backup which is the required function of emergency lighting system.

, Description:
FIELD OF INVENTION
The present application relates to a powerline failure detection mechanism for emergency lighting system in consumer products, and particularly to a small, low-cost sensing assembly and a corresponding inductive switch and a LED emergency lights.
BACKGROUND ART
Emergency lighting is a vital and effective life safety tool, providing reassurance and guidance to people in critical times such as a sudden blackout. By nature, the emergency lighting system should turn ‘On’ when such a condition arises or when the main or primary source of supply is interrupted.
To sense the primary AC mains, signal various methods are available. Usually the AC mains voltage is stepped down to some lower value as per the application requirement. Then the magnitude of the primary signal which is alternating voltage (AC) is converted into different form such as Direct Current (dc) which is called as rectification, the output DC voltage is usually a pulsed AC signal hence needs filtration and conditioning circuit. The regulated output can be given to microcontroller as a dc sensing input indirectly detecting presence of ac signal
Another way is to use regular electronic devices to sense the primary AC mains signal, a set of electronics components are required which usually contains integrated circuits with analog to digital converter (ADC) along with some reference voltage power source etc. In such setup, a predefined number of samples are required to provide the output at the end of analog to digital conversion Cycle. Most of the components used are highly sensitive to the environmental changes.
In the prior art, the Patent application US2010 / 0066251, discloses a charging device is applied to the emergency lights, the charging device comprises a charging station, charging station is mounted within the transmission module and an inductive sensor mounted in the emergency light receiving module housing, the sensing large rings of sensing lines at the output of transmission module disposed on the outer sleeve rings of small sensing lines to accept input of the sensing module, sensing the work output of the transmission module sensing line rings of large input power supply plug into magnetic energy the sensing module accepts input of small rings of the magnetic flux lines induced voltage and converted to charge the rechargeable battery emergency lights. However, inductive portion of said charging means by a small sensing lines rings of and a sleeve disposed outside the small sensing lines rings of a large sensing line rings of the composition, so that the flux lines rings of too large, the copper wire used in many heavy weight and high cost, but also makes the sensing part the volume is too large, not into small products.
Therefore, the need for a problem can be solved using a sensing assembly which is always active and senses the presence of power in the ac input line.
SUMMARY OF INVENTION
An object of the present application is to provide a small, lightweight, induction emergency lights. To achieve the purpose, the present application provides a sensing deviceconfigured for use with emergency light, for flashlights, a small fan, electric shavers, table lamps, headlights, camping lights and other electronic products power / charging, The said sensing means comprises an inductive switch and a sensing module receiving module,. Wherein the magnetic flux concentratorhousing mounted on the first module, the sensing module is mounted in a small air gap/window. Said sensing line disposed on the rings of sensing the output of the transmission module, said electromagnetic inductive bar is provided on the input of the receiving module, and vice versa.
Preferably, the Sensor assembly comprises of flux concentrator unit surrounded by current carrying conductorand a sensor module, cooperating first sensing assembly and the second sensing circuit, said second sensing circuit is a flux sensing circuit, the sensing or rings of wire rod constituting said electromagnetic resonant inductor sensing circuit.]
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

Fig 1 illustrates conceptual block diagram of the Powerline failure detection mechanism for Emergency Lighting System in accordance with the present invention.

Fig 2 illustrates the sensor, ac concentrator assembly at the input ac mains side in accordance with the present invention;

DETAILED DESCRIPTION

In the emergency Lighting System, here in the proposed solution, to sense the ac primary signal, one of the properities of the ac mains signal has been used.
In general an “electric charge” creates “electric flux” and the “moving electric charge” creates the “magnetic flux”. So it means that whenever the primary alternating current signal is present, it produces the relative magnetic flux. It is the property of the alternating current is that it creates the magnetic field which in turn can be used as an input to sensing circuit.
The Proposed system uses a sensing circuit which gives an output based on the magnetic flux in the inductive component placed at the input side of the complete circuit. When the primary ac signal is present, it will produce magnetic flux in the inductive component. The design of the inductive component and the placement of the sensing unit is such that the ac magnetic field influences the sensing unit. The result of this phenomena produces corresponding potential difference at the output of the sensing assembly, which in turn triggers the LED driversubsystem to power up the LED load as the ac mains is present,
If the mains alternating current is absent or even sufficient current is not drawn by the circuit, the sensing assembly will observe absence of magnetic flux or reduced magnetic flux which in turn trigger the battery circuit to power up the LED load.
In the proposed system, there is no direct contact between the ac circuit and sensing circuit. So, it is contact free detection. There is no moving part in the complete sensing system
The conceptual block diagram is shown in Fig 1, wherein the sensing circuit is at the input ac mains side. If the ac main is available, it will power up the battery charging circuit and will charge the battery, at the same time it is an input for the Constant current driver circuit which will give the dc output1.
Assuming the battery is fully charged and gives the required emergency dc output named as dc output 2. The selector circuit will havethese two as inputs and will link any one of them to the LED load depending upon the trigger by the sensing circuit. The sensing circuit will produce the desired output depending upon the presence of the 230V ac mains. If the ac mains ispresent, the sensing circuit will trigger the selector circuit to power up the LED load through constant current driver that is dc output 1.If the ac mains is absent, the sensing circuit will trigger the selector circuit to powerup the LED load using battery output that is dc output 2.

The Sensing Circuit as shown in fig 1, consists of ring shaped Flux Concentrator Material (1) on which the ac current carrying wire (2) has been wound. There is a small air gap (4) (window) in the concentrator, where the sensing element (3) has been placed. The sensing element is powered using dc power source (7&8) (battery). When an ac current (5&6) flows through the wire, the sensing element (3) observes the magnetic field and will produce output (9) in terms of potential difference. If there is no ac current or a very small amount of current than the regular one, the sensing element (3) will observe zero or minimum flux which in turn will produce relative output.
The keyfeatures of proposed sensing circuit
1. No need of analog to digital conversion
2. Instead of directly using the primary signal, one of the properties of the signal i.e magnetic flux is used.
3. There is no direct wired contact between the primary alternating signaling component and the sensing circuit, contact free operation to detect the presence of alternating signal without using any moving parts to open or close the contacts.
4. The sensing circuit can sense the absence of ac signal as well as internal failure of the driver subsystem and can ultimately trigger to power the LEDs by battery backup which is the required function of emergency lighting system.
5. Optimized use of the input interface circuit.

The features of our Innovative Product which are believed to be new and different from the closest technologies mentioned in the search report are,

1. It is anEmergency Lighting Device with automatic switching for secondary(Battery) backup in case of primary ac mains failure which is detected by magnetic flux sensing

2. It senses one of the properties of the mains current, that is magnetic flux without any direct wired connection, that is contact free.

3. Switching to secondary backup (Battery backup) in case of ac input fails or LED driver internal failure.

Sensing Circuit Construction (Fig 1)
1 – Ring shaped Flux Concentrator Material
2 – Current conducting wire
3 – Sensing Element
4 – Air Gap
5 – Phase incoming
6 – Phase outgoing
7 – DC positive terminal
8 – DC negative terminal
9 – sensing circuit output

Although the foregoing description of the present invention has been shown and described with reference to particular embodiments and applications thereof, it has been presented for purposes of illustration by way of examples and description and is not intended to be exhaustive or to limit the invention to the particular embodiments and applications disclosed. The particular embodiments and applications were chosen and described to provide the best illustration of the principles of the invention and its practical application to thereby enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. All such changes, modifications, variations, and alterations should therefore be seen as being within the scope of the present invention as determined by the appended claims when interpreted in accordance with the breadth to which they are fairly, legally, and equitably entitled.