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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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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

Assuming that Io is established, the transient has disappeared and load current waveform is symmetrical

HALF-BRIDGE WITH AN R-L LOAD

The s-domain circuit with Q1 switched

HALF-BRIDGE WITH AN R-L LOAD

The s-domain circuit with Q1 switched

FULL-WAVE BRIDGE INVERTER

If the load is purely resistive, the feedback diodes are not required.

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.

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.