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EE462L, Spring 2014 H-Bridge Inverter (partially pre-fall 2009 version) 1 To minimize your time and produce an inverter that works properly, it is very important that you follow the procedure in the lab document LC output filter (100µH, 10µF) Fuseholders and 10A fuses for DC input not shown in this photo 10µF input ripple current capacitor across DC input 2 ! Simultaneously View VGS for A+ and A− (use both scope ground leads) Asymmetrical firing circuit produces slow turn on, fast turn off, to provide blanking blanking time to eliminate overlap actual MOSFET turn on Multimeter check of VGS for A+ and A–. Expect about 4.0Vdc. VGS of A+ VGS of A– Save screen snapshot #1 A− Off A+ On You must avoid overlap in “on” times 3 Once the H-Bridge is wired, you cannot simultaneously view VDS of A+ and A− (or B+ and B−) on the scope because their source nodes are not the same A+ off A+ on A– on A– off + VDS of A + – – VDS of A – + But you can simultaneously view VDS on A+, and −VDS on A−, and then VDS on B+, and −VDS on B−, B+ off B+ on B– on B– off + VDS of B+ – to check for overlap – VDS of B– + 4 ! Loaded (with a resistor) and no output filter Load Voltage – No Filter. ma 1. 5 ! With Filter Load Voltage – With Filter. ma 1. Very Effective! 6 The Filter Has a Cutoff Frequency of About 5kHz a 100µH, 9A or 10A inductor b + Vac output − symbolic Point “a” in H-bridge + Vac output 10µF, 50V, bipolar, high-frequency capacitor – Point “b” in H-bridge 7 Transfer Function + Vac input − L = 100µh + Vac output − C = 10µF R = 12, 8, or 4Ω Inverter Filter Vout/Vin 4 3.5 Vout/Vin 3 2.5 12ohm 2 8ohm 1.5 4ohm 1 0.5 0 1 10 100 1000 10000 100000 Hz 8 Your circuit 9 Effect of the carrier frequency 10 Effect of the carrier frequency 11