Full Bridge Inverter With Resistive Load(R Load) : Modes of Operation and Output Waveforms

FULL BRIDGE INVERTER WITH RESISTIVE LOAD IMPORTANT FEATURES This inverter uses two pairs of switches S1S2 & S3S4 and two pairs of diodes D1D2 & D3D4 . The devices of one pair operate simultaneously In order to avoid the short circuit across the dc bus and the undefined ac output voltage condition, the modulating technique should ensure that either the top or the bottom switch of each leg is ON at any instant If switches S1 and S2 operated simultaneously then V0 = +VS If switches S3 and S4 operated simultaneously then V0 = -VS Diodes D1, D2, D3 and D4 are called feed back diodes are used to carry the current of main thyristor with which they are connected in anti parallel fashion. DEFINATION Full Bridge Inverter is Voltage source inverter that converts input DC voltage into AC output voltage. The ac output voltage is twice that obtained with half-bridge VSI topologies. The operation of Full Bridge Inverter with Resistive Load is divided into 2 modes of Operation : Mode 1 : t = 0 to T/2 Mode 2 : t = T/2 to T WORKING : Mode 1 : t = 0 to T/2 At instant t = 0 ⇒ S1 & S2 is turned ON simultaneously and S3 & S4 is turned OFF . V0 = +VS Load current I0 flows from P to Q Mode 2 : T/2 to T At instant t = T/2 ⇒ S1 & S2 is turned Off and S3 & S4 is turned ON simultaneously . V0 = -VS Load current I0 flows from Q to P At instant t = T ⇒ S1 & S2 is turned ON again and S3 & S4 is turned OFF . #FullBridgeInverterWithResistiveLoad #WorkingOfFullBridgeInverterWithResistiveLoad #OutputWaveformsOfFullBridgeInverterWithResistiveLoad