Solar Study Lamp

Solar Study Lamp

The sun powered investigation light, ordinarily known as Solar Urja (Energy) Lamp (SoUL) is a lighting gadget comprising of a sun based PV module, battery, LED, and hardware. 

fig. solar study lamp

Introduction:-

The Battery, LED, and hardware are put in a plastic lodging. The appearance of the light is like a table light wherein the light base is associated with the LED by means of adaptable gooseneck. The sun based light uses 1 Watt LED as the light source and houses 3.2 Volt, 2000 mAh battery-powered Lithium Ferrous Phosphate (LiFePO4) battery to store the force. A 2.5 Watt Solar Panel charges the light during daytime. The light is intended to give 5-6 hours of study light each day consistently. 

Components:-

• Base bottom
• Base top
• Switch cap
• LED cap
• LED reflector
• LED face (transparent)
• Goose neck
• Solar panel
• PCB(printed circuit board)
• Battery
• Load wire
• Load LED
• Screws

Specification of PV module:-

Cell Type	Mono or Polycrystalline Silicon solar cells Module should be manufactured in India
Lamination	Toughened glass cover and EVA sheets
Module Frame	ABS or Ultra High Impact Polystyrene (Jet Black Colour)
No. of Solar Cells in the Panel	10 cells - Solar module to satisfy the technical specifications provided in tender doc. & the same will be tested at the time of proto-type submission for testing at IITB.
Max. Power rating	Vmp × Imp ≥ 2.5Wp
Voltage at Max. Power	≥ 5 V
Connecting cable –Typ	PVC Dual Sheated, 2 Core, 0.25sqmm (Each conductor) Copper Cable
Connecting cable – Length	3.5 Mtrs
Electrical Data*(Nominal):	Under STC

Specification of battery:-

Battery chemistry type	Rechargeable LFP (LiFePO4) battery
Nominal Operating Voltage	3.2 V (minimum 2000 mAh ) measured at Standard condition
Tolerance	3.2V±5%
Temperature	10℃ to 50℃
Battery casing	22650
Minimum Number of charge-discharge cycles	2000
D o D	Up to 85-90%

 

Specification of circuit and LED:-

Reverse current protection	Included
Short Circuit Protection	Included
Battery upper voltage cut-off	3.6 ± 0.1 V
Battery lower voltage cut-off	3 ± 0.1 V
LED driver type	Constant current

Driving Current Mode 1 Driving Current Mode 2	40 mA
	130 mA @150 Lux
Stand by/Leakage current	< 1 mA
Indication Red Indication Green	ON @ low voltage = 3 V
	Blinking while charging ON @ fully charged = 3.6 V
Circuit Efficiency	80-85%

PCB front side

LED

Technology	White Light Emitting Diode (W-LED)
Operating Voltage	6.3 V
Power Consumption (Pmax)	≤ 1.5 Watt (Max)
Illuminance Mode 1 Illuminance Mode 2	Minimum 50 Lux when measured at the periphery of the 45 cm diameter from height of 30 cm.
	Minimum 150 Lux when measured at the periphery of the 45 cm diameter from height of 30 cm.
Luminous performance of LED (Efficacy)	Minimum 150 Lumen per Watt
Operating Temperature	30℃ to 85℃
Color rendering and appearance	CCT: between 5700K to 6500K

PCB back side

PCB installed 

Getting Certification

That's my certificate from IIT Bombay.

Star-delta starter

Introduction to star-delta starter:-

some induction motor are turned over legitimately on line, however when exceptionally enormous engines are turned over that way, they cause an aggravation of voltage on the gracefully lines because of huge beginning current floods.

(fig.star-delta starter)

To restrict the beginning current flood, huge acceptance engines are turned over at decreased voltage and afterward have full gracefully voltage reconnected when they approach close to pivoted speed.

Components of star-delta starter

• contactor
• overcurrent relay
• MCB
• Timer
• conductor
• NO,NC switch
• R,Y,B indicator
• starter box

working of star-delta starter

This is the decreased voltage beginning technique. Voltage decrease during star-delta beginning is accomplished by genuinely re configuring the motor windings as delineated in the figure beneath. During turning over the motor windings are associated in star setup and this decreases the voltage over each winding 3. This likewise lessens the force by a factor of three.

thats the working of star-delta starter 

After a timeframe the winding are reconfigured as delta and the engine runs ordinarily. Star/Delta starters are presumably the most widely recognized diminished voltage starters. They are utilized trying to decrease the beginning flow applied to the engine during turn over as a methods for diminishing the unsettling influences and impedance on the electrical gracefully.

that's the picture of build the star-delta starter

power wiring 

power wiring of starter

power circuit of star-delta starter

control circuit of star-delta starter

Features of star-delta starter

• Mechanical load on changeover from star to delta
• Reduced starting torque
• Current peak on changeover from star to delta
• Six connection cables
• For low- to high-power three-phase motors.
• Reduced starting current

That's me getting certificate from PIET.