Embedded Internship Test.pdf

EMFLUX MOTORS PVT. LTD. Embedded Internship Assessment Test August 2024 Note: 1. ALL questions from PART A and PART B are COMPULSORY 2. Write down all the assumptions, formulae used and comments along with the solution. 3. A...

EMFLUX MOTORS PVT. LTD. Embedded Internship Assessment Test August 2024 Note: 1. ALL questions from PART A and PART B are COMPULSORY 2. Write down all the assumptions, formulae used and comments along with the solution. 3. Answers to be submitted in a ‘.pdf’ format. Handwritten answers will not be accepted (diagrams or representations can be drawn by hand). 4. The test will be used to evaluate your approach to the problem, theoretical knowledge and assumptions they make to solve the practical problems related to automotive engineering. All the best! PART A (All Questions are Compulsory) 1. Assuming the circuit starts at t = 0, plot a graph for Output Voltage vs Time t for the circuit as shown in Fig: 1.0, also mention the calculations involved. (Consider ideal Op Amp) Fig: 1.0 2. Consider an input voltage waveform (Vin) as given in the graph. Also consider Vbe to be 0.6 V and Zener Voltage of the diode as 10V. Plot Output Voltage vs Time. (Refer Fig: 2.0) Fig: 2.0 3. Find the output voltage ( Refer Fig: 3.0) (Consider β=100, Vbe=0.7, Vce=0.3 Volts) Fig: 3.0 PART B- EMBEDDED QUESTION 1. This is the microcontroller section of a BLDC ceiling fan which is operated using a fan regulator. Make an embedded program to control the fan assuming the following configuration:- The internal ADC reference voltage is set to 2.5V. CS is the current sense signal which corresponds to 69mV per Watt of power from the mains supply. This signal is used for closed loop running of the fan at different power levels. I2C communication is used to communicate with the fan motor driver DRV10983. Speed setting is done based on Vac_Sense signal where 265 Vac corresponds to 2.5V (100% ADC value). 30Vac corresponds to 0 speed and 200Vac corresponds to full speed. Between 30Vac and 200Vac, the fan speed increases linearly. You can make assumptions for any missing information. Clearly mention all the assumptions.