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WEEK 13: MOTOR SPEED SYSTEMS: CONVERTERS Sections: Introduction | 1Q DC to DC | 2Q DC to DC | 4Q DC to DC Definition. Converters are devices that converts AC to DC and vice versa. Functional Classifications Hierarchy of Power Conversion Functions
Sections: Introduction | 1Q DC to DC | 2Q DC to DC | 4Q DC to DC First Quadrant DC to DC Conversion Theory. - one polarity of DC voltage, one polarity of DC current. Used to condition DC power from either a rectfied utility supply to a DC source (fuel cell, battery, solar photovoltaic array). Boost Configuration - Load voltage is greater or equal to source voltage. Buck Configuration - Load Voltage is less than or equal to source voltage Note. Controllable switches, S2a and S2b, can either be transistors (bi-polar) or gate-turn-off (GTO) thyristors. S1b and S1a are called "freewheel diodes", complimentary switches which turn-on automatically to satisfy current source demands, when S2a and S2b are opened. Sections: Introduction | 1Q DC to DC | 2Q DC to DC | 4Q DC to DC Second Quadrant DC to DC Conversion Theory - two polarities of DC voltage, one polarity of DC current. Used to condition DC power from either a rectfied utility supply to a DC source (fuel cell, battery, solar photovoltaic array). Boost Configuration - Load voltage is greater or equal to source voltage. Buck Configuration - Load Voltage is less than or equal to source voltage Sections: Introduction | 1Q DC to DC | 2Q DC to DC | 4Q DC to DC Fourth Quadrant DC to DC Conversion Theory. - also known as dual converters, two polarities of DC voltage, two polarities of DC current. Used to condition DC power to be driven or regeneratively brake in both the forward and reverse directions. |
