Description:FORM 2

THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003

COMPLETE SPECIFICATION
(See section 10, rule 13)

Title of the invention

SWITCHING OF BATTERY PACKS OF AN EV AT DIFFERENT VOLTAGE AS PER SYSTEM REQUIREMENT

Applicant Name: AETERNA ENGINEERING TECHNOLOGIES PVT. LTD.
Nationality: An Indian Company
Address: C/o The Elite 441, Madurdaha, Kolkata 700107,
West Bengal, India

The following specification particularly describes the invention and the manner in which it is to be performed.

FIELD OF INVENTION
The present invention relates to Switching of battery packs of an EV at different voltage as per system requirement. More particularly, the invention discloses controller switch configured for activating charging and discharging of battery pack of an electric vehicle (EV).

BACKGROUND ART
Charging of battery packs of EV required to be carried out at normal voltage whereas operation of EV required very High Voltage.
High Voltage DC/DC conversion from available supply system inside a mobile eco system associated with EV is unsafe and inefficient. This requires additional hardware; their cooling, periodical maintenance may lead to possibilities of recurring failures.
It was targeted not to use any complicated system of high voltage DC/DC conversion thereby reducing all the problems associated with it; by designing a circuit of parallel series combination.

SUMMARY OF INVENTION
The invention relates to dynamic battery pack series-parallel combination switching so as to make it compatible with the input charging system rather than limiting the input charging voltage by leveraging voltage step-up or step-down with additional components.
Such as herein discloses there is provided a battery pack configured for dynamically switching and be compatible with the input charging system voltage. Currently, different input charging voltages need to be step-up or step-down to make it in parity with the battery pack voltage.
Currently, different input charging voltages need to be step-up or step-down to make it in parity with the battery pack voltage. This involves additional components for each scenario & involves losses & increase point-of-failures. Our invention of dynamic switching is not limited to any specific voltage & can cater to a wider range of input voltages.

BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS
Fig 1, illustrates the power circuit in accordance with the present invention;
Fig 2 illustrates the control circuit in accordance with the present invention.

DETAILED DESCRIPTION
The invention is achieved by following the concept that since the present requirement of input voltage to VFD is 660V. The inventors have planned to use three (03) nos. of battery packs of 220 VDC each. When these three battery packs are put in series configuration, we get 660VDC which can be applied to VFD as input voltage for EV operation. When the battery packs require charging all the three battery packs are put in parallel configuration for charging through normal battery charger. The packs will be dynamically adjusted to get charging voltage from battery charger. Being a no-load switching system this free from any high voltage transience and safe for EV application. Also, with the use of contractor logic this system eliminates all of DC/DC conversion equipment and their cooling system whatsoever.
Legend
Charger – Incoming Supply 230 VAC. Output Voltage 220 VDC, Rating – 15 amps
Battery 1 Each rating 220 VDC. Total quantity of battery pack 3 Nos.
Battery 2

Battery 3

MCB 1 Miniature circuit breaker DC 6A, 220 V
MCB 2

Component List:
C1, C2, C3 – Power Contractor DC 220V, 32A, 4 Pole, 3 NO+ 3NC Aux Contact 6 A
IL1, IL2, IL3, IL4 – Indicating lamps (Red), 220 VDC
SS1- Selector Switch Single Pole triple throw, 220 VDC, 6A
START PB – START PUSH BUTTON, 2 Pole, Green, PUSH to ON
STOP PB- STOP PUSH BUTTON, 2 Pole , RED, PUSH TO OFF

OPERATION PHILOSOPHY
Precondition- After EV running dashboard indicates battery charging required.
Step
1. EV to be kept in parking stage
2. SS1 to be kept in position 2 from position 3
3. MCB1 & MCB2 to be made ‘ON’ Control Ready (Test) signal glow.
4. SS1 to be shifted to position 1 (Charging mode)
5. Battery charger to be connected to 230VAC supply and made ON. On receipt of feedback from battery charger Power Contactor C1 will turn ON and all the three (03) Batteries will be connected in Parallel Configuration. The terminal voltage will be resultant of 3 Nos. 220 VDC battery packs put in parallel. Since battery charger voltage is higher than resultant voltage the charging of batteries will start. Indication Lamp ‘Charging Mode’ will be ON.
6. On achieving predetermined condition charging will stop and feedback from charger will be withdrawn and contactor C1 will drop to ensure end of charging mode.
7. SS1 Now to be shifted to Position 3. Now with pressing of START PB contactor C2 will be ON which will put all the three (03) batteries in series configuration and DC Voltage of 660 =V is ready to be applied to VFD.
8. This DC Voltage of 660V will only be applied to VFD in no load condition with all other precondition being satisfied which includes all the health check-up of battery packs and system parameters. Only after getting the clearance and command as ‘Ready from Dashboard’ input received contactor C3 will be “ON” and 660 VDC Voltage will be supplied to VFD for onward operation.
9. In course of running EV when ‘battery Charging Requirement’ is indicated by system alarms/annunciations charging of batteries shall be undertaken.
10. All the steps from beginning shall be followed as indicated above.

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.
, Claims:WE CLAIM:

1. A switching control circuit configured for Battery pack charging and discharging of electric vehicle comprising of :-
three number of power Contractor DC (C1, C2, C3) of rating 220V, 32A, 4 Pole;
three number of NC Auxiliary Contact 6 A;
four number of LED indicating lamps (IL1, IL2, IL3, IL4) of rating 220 VDC;
a selector Switch Single Pole triple throw (SS1) of rating, 220 VDC, 6A;
a START PUSH BUTTON, 2 Pole, Green, (PUSH to ON) and a STOP PUSH BUTTON, 2 Pole , RED, (PUSH TO OFF);
wherein the said circuit is connected to 230VAC supply and made ON for charging; and
wherein on receipt of feedback from battery charger for charged condition, the Power Contactor C1 is made turn ON and all the Batteries get connected in Parallel Configuration for discharge / use.

2. The switching control circuit as claimed in claim 1, wherein the terminal discharge voltage will be resultant of battery packs put in parallel.

3. The switching control circuit as claimed in claim 1, wherein after achieving predetermined condition charging will stop and feedback from charger will be withdrawn and contactor C1 is drop to ensure end of charging mode.