电力电子技术第5版王兆安英文chapter05章节.ppt

Outline 5.1 Basic DC to DC converters 5.2 Composite DC/DC converters and connection of multiple DC/DC converters 5.3 Isolated DC to DC converters (Indirect DC to DC converters ) 5.1 Basic DC to DC converters 5.1.1 Buck converter (Step-down converter) 5.1.2 Boost converter (Step-up converter) 5.1.3 Buck-Boost converter (Step-down/step- up converter) and Cuk converter 5.1.4 Sepic converter and Zeta converter 5.1 Basic DC to DC converters Dc component of switch output voltage Insertion of low-pass filter to remove switching harmonics and pass only dc component Basic operation principle of buck converter Thought process in analyzing basic DC/DC converters Actual output voltage waveform of buck converter The small ripple approximation Buck converter analysis:inductor current waveform Inductor voltage and currentsubinterval 1: switch in position 1 Inductor voltage and currentsubinterval 2: switch in position 2 Inductor voltage and current waveforms Determination of inductor current ripple magnitude Inductor current waveform during start-up transient The principle of inductor volt-second balance: Derivation Inductor volt-second balance:Buck converter example The principle of capacitor charge balance: Derivation Boost converter example Boost converter analysis Subinterval 1: switch in position 1 Subinterval 2: switch in position 2 Inductor voltage and capacitor current waveforms Inductor volt-second balance Conversion ratio M(D) ofthe boost converter Determination of inductor current dc component Continuous-Conduction-Mode (CCM) and Discontinuous-Conduction-Mode (DCM) of buck Continuous-Conduction-Mode (CCM) and Discontinuous-Conduction-Mode (DCM) of boost 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 Bridge chopper