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AC Power Supplies

AC Power Supplies. Applications Standby source for “critical” loads (computer) Primary source when normal ac not available Uninterrupted Power Supply (UPS) 2 common configurations. Configuration 1 Load normally supplied by Main Supply. Operating Modes. Normal condition

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AC Power Supplies

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  1. AC Power Supplies • Applications • Standby source for “critical” loads (computer) • Primary source when normal ac not available • Uninterrupted Power Supply (UPS) • 2 common configurations

  2. Configuration 1Load normally supplied by Main Supply

  3. Operating Modes • Normal condition • Main supply applied to the load • Rectifier keeps batteries charged • Main supply failure • Inverter supplies power to the load • When interruption is over, main supply is applied to the load

  4. Configuration 2Inverter supplies power to the load

  5. Operating Modes • Normal condition • Inverter operates continuously, powering the load • Rectifier maintains the charge on the batteries • Inverter conditions the supply to the load • Inverter failure • Main supply powers the load

  6. Typical UPS System

  7. Operating Conditions • Main supply failure • Battery supplies the inverter • Inverter powers the load • Normal conditions • Inverter operates as a bridge rectifier • Main supply powers the load

  8. Types of AC Power Supplies • Switched-mode • Resonant • Bidirectional

  9. Switched-Mode AC Power Supply

  10. Features of the Switched-Mode Configuration • Two inverters • Input side: operates at high-frequency • Reduces size of transformer and DC filter components at the input of the output-side inverter

  11. Features of the Switched-Mode Configuration • Two inverters continued • Output side: operates at output frequency

  12. Resonant AC Power Supply

  13. Features of the Resonant AC Power Supply • Two inverters • Input side is a resonant inverter • Output side operates with PWM control at the output frequency

  14. Bidirectional AC Power Supply

  15. Features of the Bidirectional AC Power Supply • Output inverter and Rectifier are combined into a cycloconverter (converts one frequency ac into another frequency ac) • Power flow in either direction

  16. Multistage Conversions

  17. Multistage Conversions (continued) • Four conversions • AC-DC – DC-AC – AC-DC – DC-AC • Ultimately an AC – AC Conversion

  18. Alternative Configuration2-Forced-Commutated Cycloconverters

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