Thursday 31 July 2014

A Highly Efficient Solar Lantern by Texas Instruments

A Street Light Solution - System Block Diagram
A Highly Efficient Solar Lantern Block Diagram






  • TI had designed solar lantern solution specifically for Indian rural market with circuit protections, more shelf life, user control interface with dimming feature and the most important thing, very high power efficiency providing great backup time.
Key Solution Features:
  • Boost Drive Stage for 3W (3 LEDs in Series)
  • Stand-by current < 500uAReverse
  • Polarity protection for Battery and Panel
  • 4 Stage Charging profile for Battery
  • User interface in form of Keys and Indication LEDs
  • Under-voltage Cutoff

TI Hero Products in this Solution
  • MSP430G2231
  • TLV70433
  • TPS61165

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Article by
Dept. of ECE
Brindavan Institute of Technology & Science (BITS)

Brindavan Institute of Technology & Science


How A Cell Phone Call Works

Photo: How A Cellphone call works...!!  for more stuff join : ALL About Electronics  |


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Article by
ECE Department
Brindavan Institute of Technology & Science (BITS)

Brindavan Institute of Technology & Science

OPTO Coupler

An opto coupler, also called opto-isolator, is an electronic component that transfers an electrical signal or voltage from one part of a circuit to another, or from one circuit to another, while electrically isolating the two circuits from each other...!!

Photo: OPTO Coupler....  An optocoupler, also called opto-isolator, is an electronic component that transfers an electrical signal or voltage from one part of a circuit to another, or from one circuit to another, while electrically isolating the two circuits from each other...!!  for more stuff like : ALL About Electronics


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Article by
EEE Department
Brindavan Institute of Technology & Science (BITS)

Brindavan Institute of Technology & Science

Golden Rules For Electronic Circuit Design

- All components must conform to the specified temperature range. For resistors, de-rating of power rating at peak temperature must be considered. For capacitors de-rating of capacitance, leakage and increase in ESR at peak temperature may be important. For other components such as diodes and transistors, parameters such as recovery times and current gain vary with temperature and must be considered at extreme temperatures. In summary, no design calculation must be left to chance (as is often the case with designs put together in haste), temperature effect calculations are indispensable to success.

- Devices connected to interfaces must be well protected from ESD (Electrostatic Discharge) damage. ESD damage may occur at the time of prototype construction, during manufacturing or during use. Contrary to common misconception ESD at the time of production may not render a device defunct, but may cause progressive deterioration which may result in field failure. Therefore built in ESD protectors are necessary and Mansi Engineering ensures that all its designs incorporate them where necessary. IEC 61000-4-2 is a widely accepted ESD test conformance standard. ESD protectors include MOVs, TVS diodes, ESD Protection Clamping diodes and the newly introduced Polymer based devices. Selection of the right type of protector depends on capacitance that can be tolerated without signal deterioration and other factors such as tolerable leakage current, cost, pin outs and board area required. In addition, ESD protectors must be placed as close as possible to the signal entry location and as far away as possible from the device being protected so that the resulting large trace impedance attenuates the high frequency ESD energy as it travels towards the protected device. Zener or TVS diodes must be placed between power supply lines and ground to absorb ESD energy traveling via other protector diodes towards power supply line, while the device is powered off.

- Terminals connecting to inductive sources must be protected from switching overshoots or undershoots using clamping diodes or other devices. Long traces that carry heavy currents may act as sufficiently large inductors to cause unwanted switching transients and therefore protection is necessary.

- Signal lines must be well protected from radiated and conducted EMI. Ferrite beads and capacitor filters are effective means to block EMI.

- Within limits of budget, every design must incorporate sufficient protections from wrong connections, such as battery polarity reversal and accidental grounding of an output line. Large resistors are recommended to be used in series with microprocessor outputs driving drivers that drive large inductive loads. This ensures that the processor is well protected from switching transients.

- Functioning of the system at power up must be analyzed. For example it is important to deploy pull-up resistors on microprocessor output signals that need to be high on power up. Similarly functioning of relevant parts when powering down deliberately or accidentally, must be analyzed. For example, when processor state saving is involved during power down, a power down detect functionality might prove indispensable.

- For EMC, it is recommended to use inductors (preferably shielded) to slow down sharp current rise and fall times. Sharp current transients cause a sharp varying and traveling electromagnetic field.

- It is important to assign test points to relevant nets. Especially all ground and power nets, bias or threshold points and other serviceable signals must have a test point, which add convenience during testing and troubleshooting. Test points may be free vias with suitable drill size to accept and retain stainless steel needles or header leads.

- Having an on board power on LED indicator has its own importance. It warns the engineer and people around that the circuit is live and prevents accidents."

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Article by
Dept. of ECE
Brindavan Institute of Technology & Science (BITS)

Brindavan Institute of Technology & Science

Brindavan Institute of Technology & Science (BITS), Kurnool

About us :
        A developing country like India has to keep pace with the rapid changes the world over. Noticing that while Andhra Pradesh produces a record number of professional graduates each year, but not all are trained to be industry-ready. So to fill that void a visionary group of academicians founded the Creative Educational Society (CES). Under the Society, two institutions were established Creative Educational Society’s College of Pharmacy (CESCOP) and Brindavan Institute of Technology and Science (BITS).
       CESCOP was established in the year 2006 with a vision to produce world-class pharmacy professionals who are industry-ready. The CES College of Pharmacy is being further developed as a center of excellence for world-class pharmacy education and research. With a committed team of professionals and experienced faculty, CESCOP has become a force to reckon with in pharmaceutical educational and research sector in very short period of its existence.
      Established in the year 2008, Brindavan Institute of Technology and Science began with a dream to impart the best-in-class engineering education and provide a strong career background to students pursuing the various disciplines of engineering. With aspirations and a matching intelligence BITS is on its quest of trailblazing successes and memorable victories.

Why BITS ?

The BITS’s advantage: The college is proud to have highly educated, experienced, committed and dedicated faculty members who are constantly occupied with the thought of producing only fine engineers. The college is set on a sprawling campus adjacent to NH-7, just 9 kms from the historic Kurnool town. Being away from the hustle and bustle of Kurnool town, the college provides the right setting for students to pursue world-class education. High quality infrastructure, well stocked library and excellent recreation facilities ensure that students pursue the professional engineering course in the most modern methods thus molding them into professionals sought after by the industry.

Brindavan Institute of Technology & Science