Research On AC-AC Resonant Converter Based On RB-IGBT And Its Driving Technology

Since the emergence of the Reverse Blocking Insulated Gate Bipolar Transistor(RB-IGBT)in the 1990s,it has been gradually applied to T-type three-level inverters,matrix converters,switched capacitor AC-AC converter and other power electronic devices.The RB-IGBT has a reverse voltage blocking capability,and the bidirectional controllable switch formed by the RB-IGBT can significantly reduce the on-voltage drop and the on-state conduction loss compared with the conventional IGBT.In order to solve the problem that electronic equipment cannot be used due to different voltage levels in different countries,this paper studies an RB-IGBT based AC-AC resonant converter(RBACRC).The topology and working principle of RBACRC are analyzed.The bidirectional controllable switch composed of anti-parallel RB-IGBT realizes the bidirectional flow of power while significantly reducing the conduction loss of the device.Based on the idea of switched capacitors,RBACRC achieves the soft switching action of all RB-IGBTs by introducing resonant inductors,further reducing the switching losses of the devices.In addition,based on the establishment of RBACRC equivalent circuit and mathematical model,this paper analyzes the design principles of key parameters of the circuit.In view of the current lack of dedicated integrated drive circuit for RB-IGBT discrete devices,this paper studies the RB-IGBT dedicated integrated drive technology based on the analysis of RB-IGBT operating characteristics.Firstly,the key driving parameters such as RB-IGBT driving power and resistance are analyzed.The failure mechanism and protection solution of RB-IGBT are studied.The protection circuits such as gate overvoltage protection,desaturation detection and active clamp are designed to prevent the RB-IGBT life loss or failure caused by circuit failure.Finally,this paper develops a set of laboratory prototypes,and carries out detailed experimental research on the integrated driver and RBACRC circuit developed in this paper.The experimental results verify the feasibility of the theoretical analysis and design scheme.