FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
As amended by the Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2006
PROVISIONAL SPECIFICATION
(See section 10 and rule 13)
TITLE OF INVENTION
Intelligent mains switch status detector


APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR
Sanjay Vyavahare of Crompton Greaves Limited, Lighting Division, Kanjur (E), Mumbai 400042, Maharashtra, India, an Indian National
Nirody Jaishankar Sithanand, A-l Nandanvan, M G Road, Mulund, Mumbai 400080, Maharashtra, India, an Indian National


PREAMBLE TO THE DESCRIPTION

The following specification describes the invention


The invention relates to an intelligent mains switch status detector for detecting the ON/OFF position of Main Switch during power ON/OFF condition
Any equipment / appliance such as a Lamp, a Fan or an Inverter which is used in an emergency (battery backup) mode, generally has a switch on the unit for mains operation as well as a separate switch for switching off the equipment when being operated from the battery which cuts off the battery supply when battery operation is not needed.
In prior art patent no. US 5365145 disclose Lamps are operated manually in the Battery Operated mode whereas in our case the operation is automatic in either of the cases i.e. in the Mains operated mode or in Battery operated mode.
An object of the invention is to provide to an intelligent mains switch status detector for detecting the ON/OFF position of Main Switch during power ON/OFF condition
Yet another object of the invention is to provide an intelligent mains switch status detector to save energy consumption as well as the life of the auxiliary supply.
Another object of the invention is to provide an intelligent mains switch status detector which provides more safety to user.
Another object of the invention is to provide an intelligent mains switch status detector which saves cost in terms of energy, life of equipments and auxiliary supply units

Another object of the invention is to provide an intelligent mains switch status detector which increases the life of accessories of the equipments by preventing its power supply, changing from main supply to emergency mode.
Another object of the invention is to make use of different sensors such as PIR, LDR, INFRARED,TEMp sensors, Pyro detectors, HF sensors etc. to make the equipment/appliance more intelligent.
According to the invention an intelligent mains switch status detector comprises Main supply, switch, step down transformers, rectifiers & filters, oscillator, battery & charging unit, comparator with reference, logic block which is connected with output device.
In accordance with the present invention, AC main supply is connected with switch and second step down transformer, switch is further connected with first step down transformer, first step down transformer is connected with first rectifier, first filter and output of oscillator, whereas second step down transformer is connected with second rectifier and second filter, output of first rectifier and first filter is connected with comparator, which is also connected with reference, output of oscillator is connected with output of first step down transformer and input of first rectifier and first filter, output of comparator is providing first input to logic block, whereas output of second rectifier and second filter is connected to the input of the oscillator and is connected with battery through charger and also providing signal two to logic block.

In accordance with the present invention, Intelligent Mains Switch Detector, there are four possible conditions of the AC Mains supply in combination with the Switch condition which have to be decoded for giving an output signal to the Equipment / appliance to switch ON or OFF in either the Mains operated mode or the Battery operated mode.
In accordance with the present invention, as per condition one, AC Mains supply is available and Switch is OFF, then first Step Down Transformer is OFF and second Step Down Transformer is ON. The second Rectifier and second Filter gives a DC voltage which is used to charge the battery through the Charger. This DC voltage is also applied to the Oscillator which turns OFF and is also applied to one of the inputs of the Logic Block. The Logic Block could be a discrete component based circuit or a microcontroller based circuit which will give a logic Output depending on the two logic inputs it receives. The Rectifier and first Filter does not have any input voltage hence the Comparator has a low voltage at one of its input and the other input is held at a higher voltage by the Reference. The output of the Comparator which is a low logic level is given to the other input of the Logic Block. This condition creates a logic high on input one of Logic Block and a logic low on the input one of the Logic Block.
In accordance with the present invention, as per condition two, AC Mains supply is available and Switch is ON, then first Step Down Transformer is ON and second Step Down Transformer is ON. The Rectifier and second Filter gives a DC voltage which is used to charge the battery through the Charger. This DC voltage is also applied to the Oscillator which turns OFF and also applied to one of the inputs of the Logic

Block. The Rectifier and first Filter has an input voltage hence the Comparator has a high voltage at one of its input and the other input is held at a set voltage by the Reference. The output of the Comparator which is a high logic level is given to the other input of the Logic Block. This condition creates a logic high on both of the inputs i.e. input one and input two of Logic Block.
In accordance with the present invention, as per condition three, AC Mains supply is not available and Switch is OFF then second step Down Transformer is OFF. The Rectifier and second Filter has a low output voltage which turns ON the Oscillator. The Oscillator supplies a high frequency signal to the first Step Down Transformer and the Rectifier and first Filter. As the Switch is open, the first Step Down Transformer acts as a high impedance for this high frequency signal from the Oscillator and so this signal is rectified by the Rectifier and first Filter and given to the Comparator of which the other input is held at a set voltage by the Reference. This gives a logic high at the output of the Comparator. This condition creates a logic high at inputl and a logic low at input2 of the Logic Block.
In accordance with the present invention, as per condition four, AC Mains supply is not available and Switch is ON, then second step Down Transformer is OFF. The Rectifier and second Filter has a low output voltage which turns ON the Oscillator. The Oscillator supplies a high frequency signal to the first Step Down Transformer and the Rectifier and first Filter. As the Switch is closed, the first Step Down Transformer primary gets connected to the various loads connected to the Mains Supply which acts as a low impedance for this high frequency signal from the Oscillator and so this signal isvery much reduced. This voltage is rectified by the

Rectifier and first Filter and given to the Comparator of which the other input is held at a set voltage by the Reference. The set voltage of the Reference is such that the signal from the Rectifier and first Filter is lower than the set voltage. This gives a logic low at the output of the Comparator. This condition creates logic lows at input one and at input two of the Logic Block.
.In accordance with the present invention, the Logic Block has four unique logic input levels for the four unique conditions mentioned above. The Logic Block can thus be programmed to give a signal to the Output when Condition two and Condition four occur i.e. when the Switch is ON. The Output can be a Relay or a solid state switch connected to the operating equipment / appliance so that it can be operated in either the Mains operated mode or battery operated mode only when the Switch is ON.
In accordance with the present invention, a circuit which senses the status of the mains switch of the equipment / appliance in normal operation as well as in battery backup mode and thus eliminating the need for a separate switch for the Battery backup mode. This also results in more convenience for the user having to operate only one switch and also results in power saving as the equipment / appliance does not switch ON as soon as the Mains power goes OFF, if not needed.

In accordance with the present invention, different sensors such as PIR, LDR, INFRARED,TEMP sensors, Pyro detectors, HF sensors etc can be incorporated to make the equipment/appliance more intelligent.

(Ivan Bernard Fuller)
ofKhaitan&Co
Agent for the Applicants
Dated this 26th day of March 2009