1. Inverters Converting dc to ac
Islamic University of Gaza
Faculty of Engineering
Electrical Engineering Department
Inverters Converting dc to ac
Inverters are circuits that convert dc to ac.
More precisely, inverters transfer power from a dc source to an ac load.
The controlled full-wave bridge converters in Chap. 4 can function as inverters in some instances, but an ac source must preexist in those cases.
In other applications, the objective is to create an ac voltage when only a dc voltage source is available.
Introduction to Power Electronics
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2. and running ac appliances from an automobile battery.
Islamic University of Gaza
Faculty of Engineering
Electrical Engineering Department
Inverters are used in applications such as adjustable-speed ac motor drives, uninterruptible power supplies (UPS),
and running ac appliances from an automobile battery.
Introduction to Power Electronics
Dr.Moayed Almobaied
Ch8_2

3. THE FULL-BRIDGE CONVERTER
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THE FULL-BRIDGE CONVERTER
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4. Islamic University of Gaza Faculty of Engineering
Electrical Engineering Department
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5. 8.3 THE SQUARE-WAVE INVERTER
Islamic University of Gaza
Faculty of Engineering
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8.3 THE SQUARE-WAVE INVERTER
The simplest switching scheme for the full-bridge converter produces a square wave output voltage.
The switches connect the load to Vdc when S1 and S2 are closed or to -Vdc when S3 and S4 are closed.
The periodic switching of the load voltage between Vdc and -Vdc produces a square wave voltage across the load.
Although this alternating output is nonsinusoidal, it may be an adequate ac waveform for some applications.
Introduction to Power Electronics
Dr.Moayed Almobaied
Ch8_2

6. The current waveform in the load depends on the load components.
Islamic University of Gaza
Faculty of Engineering
Electrical Engineering Department
The current waveform in the load depends on the load components.
For the resistive load, the current waveform matches the shape of the output voltage.
An inductive load will have a current that has more of a sinusoidal quality than the voltage because of the filtering property of the inductance.
An inductive load presents some considerations in designing the switches in the full-bridge circuit because the switch currents must be bidirectional.
Introduction to Power Electronics
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7. Islamic University of Gaza Faculty of Engineering
Electrical Engineering Department
Introduction to Power Electronics
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8. Islamic University of Gaza Faculty of Engineering
Electrical Engineering Department
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9. Islamic University of Gaza Faculty of Engineering
Electrical Engineering Department
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10. Introduction to Power Electronics
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11. Islamic University of Gaza Faculty of Engineering
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12. Islamic University of Gaza Faculty of Engineering
Electrical Engineering Department
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13. Islamic University of Gaza Faculty of Engineering
Electrical Engineering Department
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14. Islamic University of Gaza Faculty of Engineering
Electrical Engineering Department
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15. Islamic University of Gaza Faculty of Engineering
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16. Islamic University of Gaza Faculty of Engineering
Electrical Engineering Department
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17. Islamic University of Gaza Faculty of Engineering
Electrical Engineering Department
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18. Islamic University of Gaza Faculty of Engineering
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