v a = -V dc when D3 and D4 are ON v a = V dc when Q1 and Q2 are ON v a = 0 when current freewheels through Q and D Positive current v a = V dc when D1 and D2 are ON Negative current leg A leg B + V a  Q1 Q4 Q3 Q2 D1 D3 D2 D4 + V dc  Power Electronic Converters in ED Systems DC DRIVES AC-DC-DC DC-DC: Four-quadrant Converter
{"Image DocumentName": "Power Electronic Converters in ED Systems", "Image ImageDescription": "DC DRIVES. AC-DC-DC. DC-DC: Four-quadrant Converter. leg A. leg B. + Vdc. \uf02d D1. D3. Q1. Q3. + Va \uf02d D4. D2. Q4. Q2. Positive current. va = Vdc when Q1 and Q2 are ON. va = -Vdc when D3 and D4 are ON. va = 0 when current freewheels through Q and D.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}