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POWER ELECTRONICS

بسم الله الرحمن الرحيم. The Islamic University of Gaza Faculty of Engineering Electrical Engineering Department. POWER ELECTRONICS. EELE 5450 — Fall 2009-2010. Instructor: Eng.Moayed N. EL Mobaied. Lecture 23. HALF-BRIDGE WITH AN R-L LOAD.

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POWER ELECTRONICS

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  1. بسم الله الرحمن الرحيم The Islamic University of Gaza Faculty of Engineering Electrical Engineering Department POWER ELECTRONICS EELE 5450— Fall 2009-2010 Instructor: Eng.Moayed N. EL Mobaied Lecture 23

  2. HALF-BRIDGE WITH AN R-L LOAD

  3. HALF-BRIDGE WITH AN R-L LOAD Assuming that Io is established, the transient has disappeared and load current waveform is symmetrical

  4. HALF-BRIDGE WITH AN R-L LOAD The s-domain circuit with Q1 switched

  5. HALF-BRIDGE WITH AN R-L LOAD The s-domain circuit with Q1 switched

  6. HALF-BRIDGE WITH AN R-L LOAD

  7. HALF-BRIDGE WITH AN R-L LOAD

  8. HALF-BRIDGE WITH AN R-L LOAD Example

  9. HALF-BRIDGE WITH AN R-L LOAD

  10. FULL-WAVE BRIDGE INVERTER If the load is purely resistive, the feedback diodes are not required.

  11. FULL-WAVE BRIDGE INVERTER Q1 and Q3 are turned on for the positive half-cycle, Q2 and Q4 for the negative half-cycle. The load voltage value is twice that of the half-bridge, i.e. for ideal switches the full battery voltage appears across the load. The rms load current is twice that of the half-bridge, and the load power is increased by a factor of 4.

  12. FULL-WAVE BRIDGE INVERTER For analysis of the full-bridge, with an R-L load, equations (4.5)-(4.7) are used with the full battery voltage instead of the centre-tapped value.

  13. End of Lecture

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