Double The Rate Of Active Clamped Resonant Dc Link Inverter

The actively clamped resonant dc link inverter (ACRDCLI) is a kind of soft-switched converter with simple topology and high efficiency, where the system peak voltage is clamped to 1.2-1.6 times dc source to lower voltage stress of power devices. The two-amplitude controlled ACRDCLI (TAC-RDCLI) further reduces the power losses on resonant elements and clamping device, and improves the whole system performance, making ACRDCLI more suitable for high power application.Based on the review of developing history of parallel resonant dc link inverter (RDCLI), i.e. from the basic RDCLI^ACRDCLI->TAC-RDCLI, this thesis studies the essence of two-amplitude control method. The actively clamped series resonant dc link inverter (ACS-RDCLI) is discussed on its operation principle and problems, whereafter the two-amplitude control method is implemented by duality to it. Thus a two-amplitude controlled ACS-RDCLI, or TACS-RDCLI, is presented, completing the similar developing chain, i.e. from the basic SRDCLI -籄CS-RDCLI -?TACS-RDCLI.Next operation process and design requirements of TACS-RDCLI are discussed. Simulations are done to verify the analysis, and to give performance comparison between TACS-RDCLI and ACS-RDCLI. The circuit parameters are optimized to minimize system power loss. With the current regulation delta modulation (CRJDM) control, a 500W prototype is developed in accordance with theoretical analysis. TACS-RDCLI not only inherits the advantages of ACS-RDCLI, but further reduces power loss and improves the system performance.The traditional power factor correction (PFC) circuit has the problem of rectifier diode's reverse recovery, and many solutions have been given as yet. By utilizing the topological characteristics of ACRDCLI or TAC-RDCLI, a new family of PFC circuits is presented, with simple structure and control, high efficiency and low voltage stress. The principle and design considerations are discussed in detail and a 1600W prototype is developed to verify the performance. The combination of this PFC circuit and TAC-RDCLI will make resonant-dc-link based inverter more suitable for industry application.Finallv research conclusion is made and further works are listed.