Abstract
A 4.5kV/100A FRD was designed by simulation, which had optimized carrier density distribute cell and ruggedness terminal. The cell was composed of P-body/N-sub/N+ layers, when the P-body doping concentration is lower, the carrier density distribution on the P-body/N-sub is lower; when carrier density di stribution on the P-body/N-sub side is lower than that on the N-sub/N+ side, the FRD has soft recovery but bad surge-current capability. So the P-body doping concentration needs trade-off consideration. Lifetime control technology was also used to optimize the carrier density distribution and trade-off characteristics. The terminal has high breakdown voltage, low electric field and large process window, which means more ruggedness and high reliability. The experiment results show that the design chip and competitor chip has nearly the same trade-off characteristics, the design chip has larger dynamic loss but lower static loss. The design chip has high surge current, the surge current is 13 times as much as the rate current.
Highlights
Fast Recovery Diodes (FRD) is usually used as freewheeling diode in anti-parallel to the IGBTs, which is an effective solution for easier controlled in the field of power systems
The chips can be used for Flexible Alternating Current Transmission Systems (FACTS), DC circuit breaker and High-Voltage Direct Current (HVDC), etc
The design chip forward voltage was lower than competitor and the reverse leakage current was on the same lever
Summary
Fast Recovery Diodes (FRD) is usually used as freewheeling diode in anti-parallel to the IGBTs, which is an effective solution for easier controlled in the field of power systems. The low losses and soft switching behaviour of the diode attract the most attention. It requires current ratings of 50A to 300A per chip and blocking voltages in the range of 1.7kV to 6.5kV in power system applications. The working frequency of the chips in power system applications is in the range of 100Hz to 15kHz. The chips can be used for Flexible Alternating Current Transmission Systems (FACTS), DC circuit breaker and High-Voltage Direct Current (HVDC), etc. The applications require reverse recovery softness, high ruggedness and good surge-current capability
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