电力电子技术第5版教学课件作者王兆安刘进军chapter05课件幻灯片.pptVIP

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电力电子技术第5版教学课件作者王兆安刘进军chapter05课件幻灯片.ppt

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Continuous-Conduction-Mode (CCM) and Discontinuous-Conduction-Mode (DCM) of boost * Power Electronics 5.2 Composite DC/DC converters and connection of multiple DC/DC converters 5.2.1 A current-reversible chopper 5.2.2 Bridge chopper (H-bridge DC/DC converter) 5.2.3 Multi-phase multi-channel DC/DC converters 5.2.1 A current reversible chopper * Power Electronics Can be considered as a combination of a Buck and a Boost Can realize two-quadrant ( I II) operation of DC motor: forward motoring, forward braking Bridge chopper (H-bridge chopper) Can be considered as the combination of two current-reversible choppers. Can realize 4-quadrant operation of DC motor. Multi-phase multi-channel DC/DC converter Current output capability is increased due to multi-channel paralleling. Ripple in the output voltage and current is reduced due to multi- channel paralleling. Ripple in the input current is reduced due to multi-phase paralleling. 5.3 Isolated DC to DC converters (Indirect DC to DC converters ) Reasons to use indirect DC to DC structure Necessary isolation between input and output In some cases isolated multiple outputs are needed The ratio of input and output voltage is far away from 1 Power semiconductor devices usually used Inverter part: Power MOSFETs, IGBTs Rectifier part: Fast recovery diodes, Schottky diodes, Synchronous rectifiers Inverter Transformer Rectifier Filter DC input AC AC DC output High frequency Isolation Classification of isolated DC to DC converters Isolated DC to DC converters Single-ended converters Forward converter Flyback converter Double-ended converters Half bridge Push-pull Full bridge According to whether transformer current is uni-direction or bi-directional 5.3.1 Forward converter Simple, low cost Uni-polar transformer current, low power applications 5.3.2 Flyback converter Simple, low cost Uni-polar transformer current, low power applicat