Title of Invention

"DIGITAL SIGNAL PROCESSING SINE WAVE INVERTERS"

Abstract This invention relates to a digital signal processing sine wave inverter which is most suitable for specialized applications like mobile phone chargers, MRI scan, ECG machines, laser printers, sonar, space probing radar, etc. The inverter comprises of AC input, AC mains sensing circuitry block, battery, regulated power supply unit, digital signal processor, inverter/charger, feedback circuitry, transformer, transfer switch and AC output. The digital signal processing unit further comprises of signal conditioner, which measures and conditions feed back signal, PWM sine wave generator and Battery charge controller which charges the battery in the five stages of bulk, boost, taper, float and pulse with the help of Auto Trickle Mode (ATM) algorithm.
Full Text F1ELD OF INVENTION
This invention relates to a digital signal processing sine wave inverter. PRIOR ART
An inverter consists of a charger and battery designed to supply power to the equipment connected to it, in case of power failure. In the event of input AC mains failure, its inverter block takes the energy from battery and converts the battery voltage to the required AC output and supplies to the equipment. The output waveform of an inverter can be square wave, quasi-square wave, quasi sine wave or sine wave. The quality of voltage and waveform on inverter mode are very important factors for the life and performance of electrical, electronics or other sophisticated equipments, which require only sine wave. /DSP sine wave inverters are most suitable for applications such as mobile phone chargers, voice and data compression echo reduction, filtering, CT, MRI scan, ultra-sound, ECG Machines, video conference systems, multimedia, all the home appliances, laser printers, space photograph enhancement, remote space probing radar, sonar, secure communication, earthquake recording and analysis, spectral analysis, simulation and modeling, process monitoring and control etc. in all such specialized applications wherein the commonly available inverters may damage the appliances.
A commonly known inverter as shown in Fig.l, comprises mainly of AC Input (1) connected to AC mains sensing circuit (2) which is connected to Inverter/charger (3) and to the battery (4). The transfer unit (5) transfers the supply to output (6) when AC Input (1) is present. When AC Input is absent, output is through the Inverter (3).

A disadvantage of the above inverter is that it consists of relatively more number of components, which increases the chances of failures.
Another disadvantage of the above inverter is that the equipment, which is operated through such an inverter produces humming noise which is irritating and uncomfortable.
Still another disadvantage of the above inverter is that it gives variation in voltage which results in more wear and tear to the equipment being run on it.
Further disadvantage of the above inverter is the wave form it gives is square wave or modified square wave whereas all the equipment which we use in our daily life are generally designed and manufactured to be operated by sine wave form, such a mismatch may danger the sophisticated and delicate equipment operated through sine inverter.
Still further disadvantage of the above inverter is that changeover time from mains to inverter and vice versa is more with the result some equipment like TV, which need constant power, come on standby mode.
OBJECTS OF PRESENT INVENTION
An object of the present invention is to provide a Digital Signal Processing (DSP) sine wave inverter which provides fully regulated sine wave output.

Another object of the present invention is to provide a Digital Signal Processing (DSP) sine wave inverter, which uses a powerful single chip microcomputer which enables execution of very complex operations at a relatively much higher speed than ordinary micro processor.
Still another object of the present invention is to provide a DSP sine wave inverter wherein a single DSP chip handles the functions of an entire electronic circuit board thereby enabling reduction in overall weight and cost of inverter.
Further object of the present invention is to provide an inverter which incorporates fewer components and is relatively more reliable.
Still further object of the present invention is to provide an inverter which requires water topping less frequently as compared to other inverters.
Yet further object of the present invention is to provide an inverter which uses software digital filters in place of hardware filters for input voltage, output voltage and output current, which minimizes the chances of failure or false measurements.
Even further object of the present invention is to provide an inverter which uses an intelligent five stage ATM battery charger (software controlled) which enhances the life of battery and charges even old and weak batteries.
Yet further object of the present invention is to provide an inverter which does not cause heating of appliances or generate any noise in the appliances operating on the inverter.

Still further object of the present invention is to provide an inverter which incorporates an intelligent user friendly LCD interface for self-testing of inverter, displaying inverter parameters, fault diagnostics and remedy to the protections in inverter and attention messages to user.
Even further object of the present invention is to provide an inverter which incorporates a port through which it can be interfaced to a computer for testing, debugging and software upgradation.
Yet further object of the present invention is to provide an inverter which incorporates an intelligent fan control for power saving and cooling.
STATEMENT OF INVENTION
According to this invention there is provided a digital signal processing sine wave inverter characterized in that AC input, connected to AC mains sensing circuitry block and battery connected to regulated power supply unit (10), digital signal processor and inverter/charger, feedback circuitry measures current and voltage of the system, transformer, transformer switch and AC output and wherein the Digital signal processor comprises of three units, signal conditioner to measure and condition feed back signal, PWM sine wave generator and Battery charge controller.
According to this invention DSP sine wave inverter comprises of AC input, AC mains sensing circuitry block, battery, regulated power supply unit, digital signal processor, inverter/charger, feedback circuitry, transformer, transfer switch and AC output. The digital signal processing unit further comprises of signal conditioner, which measures and conditions feed back signal, PWM sine wave generator and Battery charge controller which charges the battery in the five stages of bulk, boost, taper, float and pulse with the help of Auto Trickle Mode (ATM) algorithm.
The digital signal processing sine wave inverter of this invention provides fully regulated pure sine wave with controlled RMS voltage and frequency within 50Hz ± 0.5Hz DSP controllers have integrated peripherals which include analog-to-digital converter, PWM

output timers, serial communication and other functions with a strong DSP core in a single chip. The use of DSP has resulted in elimination of full analog controller, low end micro controller and other semiconductors and has led to increased system integration. lower system cost, noise immunity, programmability and reduction in hardware. DSP is an extremely powerful microprocessor that can execute very complex operations at a speed substantially greater than that of ordinary microprocessors. DSP directly controls the electrical values such as output voltage, frequency and current. As it handles alone, all the functions of an entire control board, the overall reliability is improved considerably.
DESCRIPTION OF FIGURES
1 he invention is illustrated with accompanying drawings. It is to be understood that the drawings are intended to illustrate an embodiment of the present invention and are not intended to be taken restrictively to imply any limitation on the scope of the present. In the accompanying drawings:-
Fig. 1 :- shows the lay-out of commonly known inverter
Fig. 2 :- shows the block diagram of inverter of the present invention
Fig. 3 :- shows the circuit diagram of DSP sine wave inverter
DESCRIPTION OF INVENTION w.r.t DRAWINGS
Referring to Fig. 2, the Digital Signal processing sine wave inverters of the present invention, comprises AC Input (7) connected to AC mains sensing circuitry block (8)

which senses whether mains AC is within the specified range (140V to 280V) before switching to inverter(12). AC Input (7) when it is within the above range, is connected to battery charger (9) which is connected to Power Supply Regulating Unit (10). The Digital signal processing unit (11) comprises of three units 11 (a), ll(b) and ll(c). The Battery charge controller (11c), when AC is present within the above range, charges battery (9) in five stages, with the help of Auto Trickle Mose (ATM) algorithm. The five stages are bulk, boost, taper, float and pulse. The Regulated power supply unit (10), regulates the power supply for Digital Signal Processing (DSP) unit and generates +5V supply for DSP. The signal conditioner (lla) measures and conditions the feedback signals. PWM sine wave generator (lib) generates PWM sine wave in the range of 220V AC ± 6%. In case of no AC supply Input (7), Inverter (12) converts 24V DC from battery (9) to 24 AC with PWM switching of Mosfets. Feedback circuitry (13) measures current and voltage of the system to control PWM. Transformer (14) steps up 24V AC generated by Inverter block (12) to 220V AC ± 6%. Transfer unit (15) changes over to AC output (16) automatically when AC Input (1) is present. In case there is no AC Input (1), transfer switch (15) transfer the stepped up power supply from transformer (14) to the AC output (16).
It is to be noted that the DSP sine wave inverters of the present invention are susceptible to modifications, adaptations and changes embodying the features and concepts of the present invention. Such variant embodiments are intended to be within the scope of the present invention, which is further set forth under the following claims:






WE CLAIM
1. A digital signal processing sine wave inverter characterized in that AC
input (7), connected to AC mains sensing circuitry block (8) and battery
(9) connected to regulated power supply unit (10), digital signal
processor (11) and inverter/charger (12), feed-back circuitry7 (13)
measures current and volts.ge of the system, transformer (14),
transformer switch (15) and AC output (16) and wherein the Digital
signal processor comprises of three units, signal conditioner (1 la) to
measure and condition feed back signal, PWM sine wave generator (lib'
and Battery charge controller (11c).
2. A digital signal processing sine wave inverter as substantially described
and illustrated herein.


Documents:

722-del-2003-abstract.pdf

722-del-2003-claims.pdf

722-del-2003-complete specification (granted).pdf

722-DEL-2003-Correspondence Others-(21-09-2011).pdf

722-del-2003-correspondence-others.pdf

722-del-2003-correspondence-po.pdf

722-del-2003-description (complete).pdf

722-del-2003-drawings.pdf

722-del-2003-form-1.pdf

722-del-2003-form-19.pdf

722-del-2003-form-2.pdf

722-del-2003-form-3.pdf

722-del-2003-pa.pdf

722-DEL-2003-Petition-138-(21-09-2011).pdf

722-DEL-2003-Post-Grant Opposition-(03-08-2011).pdf

722-DEL-2003-Post-Grant Opposition-(25-10-2011).pdf

722-DEL-2003-Post-Grant Opposition-(Form-7)-(21-07-2011)..pdf

722-DEL-2003-Post-Grant Opposition-(Form-7)-(21-07-2011).pdf


Patent Number 241612
Indian Patent Application Number 722/DEL/2003
PG Journal Number 30/2010
Publication Date 23-Jul-2010
Grant Date 15-Jul-2010
Date of Filing 26-May-2003
Name of Patentee M/S. SU-KAM COMMUNICATION SYSTEMS LTD.
Applicant Address WZ-1401/2,NANGAL RAYA,NEW DELHI-110046, INDIA.
Inventors:
# Inventor's Name Inventor's Address
1 JAGDEEP CHAUHAN WZ-1401/2, NANGAL RAYA, NEW DELHI-110046, INDIA.
PCT International Classification Number H03M 13/03
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA