1. CIRCUITS, DEVICES, AND APPLICATIONS Eng.Mohammed Alsumady
POWER ELECTRONICS
CIRCUITS, DEVICES, AND APPLICATIONS
Eng.Mohammed Alsumady

2. 4/16/2017
EPE 352 POWER ELECTRONICS
DC-DC CONVERTERS
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3. Step Down Converter Constant frequency operation
Variable frequency operation
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4. PWM Waveform Generation
which is also called the modulation voltage, M
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5. Step Down Operation with RL Load
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6. Step Down Operation with RL Load
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7. Modes of Operation
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8. Modes of Operation
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9. Discontinuous Operation
For a continuous load current
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10. Step-Up Operation
The average output voltage
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11. Step-Up Operation
For controllable power
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12. Step-Up Operation
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13. Converter Classifications
1st Quadrant converter
2nd Quadrant converter
1st and 2nd quadrant
3rd and 4th quadrant
Four-quadrant
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14. 1st Quadrant Converter Both the voltage and the current are positive
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15. 2nd Quadrant Converter
The voltage is positive and the current is negative
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16. 2nd Quadrant Converter
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17. 1st and 2nd Quadrant Converter
S1 and D4
S4 and D1
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18. 3rd and 4th Quadrant Converter
S3 and D2
S2 and D3
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19. Four Quadrant Converter
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20. Switching Mode Regulators
Buck Regulator
Boost Regulator
Buck-Boost Regulator
Cuk Regulator
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21. Buck Regulator
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22. Buck Regulator
The critical values for a continuous inductor current and
capacitor voltage
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23. Boost Regulator
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24. Boost Regulator
The critical values for a continuous inductor current and capacitor voltage
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25. Buck-Boost Regulator
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26. Buck-Boost Regulator
The critical values for a continuous inductor current and capacitor voltage
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27. Cuk Regulator
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28. Cuk Regulator
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29. Cuk Regulator The critical values for a continuous inductor
current and capacitor voltage
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30. Rectified Fed Converter
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31. Input Filter
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32. Summary
A dc-dc can convert a fixed dc voltage to a variable dc voltage.
A four-quadrant converter allows power flow to and from load.
Switching mode converter can produce output voltage higher and lower than the input voltage.
The rectifier fed boost converter is commonly used for unity power factor correction (UPFC).
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