Online classes pe dc-dc converter
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Get to Know regarding basics of Non-isolated and Isolated DC-DC Converter
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Online classes pe dc-dc converter
- 3. WHAT IS DC-DC CONVERTER? A CONVERTER WHICH IS CAPABLE TO CONVERT FIXED DC VOLTAGE TO VARIABLE DC SOURCE IS CALLED DC-DC CONVERTER. WHERE IS IT REQUIRED? WIDELY USED FOR TRACTION MOTOR CONTROL, IN DC ELECTRIC VEHICLES, VOLTAGE REGULATORS WHY IS IT REQUIRED? • FAST DYNAMIC RESPONSE • HIGH EFFICIENCY • SMOOTH ACCELERATION • REGENRATIVE BRAKING OF DC MOTORS • ENERGY SAVING HOW IS IT USED IS TO BE STUDIED.
- 4. PURPOSE OF DC-DC CONVERTER AS REGULATOR • Either source varies, or load demand varies; the voltage at load should remain constant and hence a converter should Regulate voltage thus named as Regulator. ControllerUnregulated Input Regulated Input Sampling Circuit Comparator Circuit Reference Voltage
- 5. LINEAR VOLTAGE REGULATOR ADVANTAGES •Output ripple voltage is low •Response is fast •Less noise •Low efficiency •Large space required •Output voltage will always be less than input voltage DISADVANTAGES
- 6. CONCEPT OF SWITCHING VOLTAGE REGULATOR
- 7. CONCEPT OF SWITCHING VOLTAGE REGULATOR ADVANTAGES • High efficiency • Low heat generation • Boost/buck/negative voltage operation possible DISADVANTAGES • More external parts required • Complicated design • Increased noise • A switching regulator is a voltage regulator that uses a switching element to transform the incoming power supply into a pulsed voltage, which is then smoothed using capacitors, inductors, and other elements. • Power is supplied from the input to the output by turning ON a switch (MOSFET) until the desired voltage is reached. • Once the output voltage reaches the predetermined value the switch element is turned OFF and no input power is consumed. • Repeating this operation at high speeds makes it possible to supply voltage efficiently and with less heat generation.
- 8. TYPES OF DC-DC CONVERTER DC-DC CONVERTER NON-ISOLATED TYPE BUCK BOOST BUCK- BOOST ISOLATED TYPE FLYBACK FORWARD PUSH-PULL
- 10. BUCK CONVERTER
- 11. BUCK CONVERTER
- 12. BUCK CONVERTER
- 13. BOOST CONVERTER
- 14. BOOST CONVERTER
- 15. BOOST CONVERTER
- 19. METHODS TO CONTROL OUTPUT VOLTAGE • CONSTANT FREQUENCY CONTROL
- 20. METHODS TO CONTROL OUTPUT VOLTAGE • VARIABLE FREQUENCY CONTROL
- 21. METHODS TO CONTROL OUTPUT VOLTAGE • CURRENT LIMIT CONTROL
- 25. FLYBACK CONVERTER MODES During subinterval 1, while transistor Q1 conducts. The inductor voltage vL, capacitor current iC, and dc source current ig, are given by vL = Vg iC = – V/R ig = i With the assumption that the converter operates with small inductor current ripple and small capacitor voltage ripple, the magnetizing current i and output capacitor voltage v can be approximated by their dc components, I and V, respectively. vL = Vg iC = – V/R ig = I
- 27. FLYBACK CONVERTER MODES During the second subinterval, the transistor is in the off- state, and the diode conducts. The primary-side magnetizing inductance voltage vL, the capacitor current iC, and the dc source current ig, for this subinterval are: vL= – v/n iC = i/n– v/R ig = 0 It is important to consistently define vL(t) on the same side of the transformer for all subintervals. Upon making the small-ripple approximation, one obtains vL= – V/n iC = I/n – V/R ig = 0
- 36. MULTI-QUADRANT OPERATION OF DC-DC CHOPPERS • There are 5 types of Chopper upon the direction of voltage and current. 1. Class A (1st Quadrant Operation) 2. Class B (2nd Quadrant Operation) 3. Class C (1st and 2nd Quadrant Operation) 4. Class D (1st and 4th Quadrant Operation) 5. Class E (All Quadrant Operation)
- 37. Class - A Chopper
- 38. Class - B Chopper
- 39. Class - C Chopper
- 40. Class - C Chopper
- 41. Class - D Chopper
- 42. Class - D Chopper
- 43. Class - D Chopper
- 44. Class - E Chopper
- 45. Applications SMPS (Switch Mode Power Supply) DC Motor Speed Control DC Voltage Booster Battery Charger Railway Traction system Electric Car (Vehicle)