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Transcript
Topology Impacts on Component Stress + Vo Vd + - - Parameter Transistor Vˆ Transistor Iˆ - Buck Vin I out - Boost Vin Vout I in Iin I out DI in Transistor I DI out DI in Diode I 1 D Iout Pulse Current Input Buck/Boost Vout DI out I out - - Transistor I rms Inductor I + Vo Vd + + Vo Vd + 1 D Iin I in Output D I in I out D I in I out 1 D I in Iin I out Both I out Single Ended Primary Inductor SEPIC + VIN + IL1 VC2 + - IL3 IL3 - VOUT - VIN D VIN VO VC 2 1 D 0 VIN VO VC 2 1 D VIN VO VO VO D 1 D VC 2 D VO 1 D 0 VC 2 VO 1 D D D VO VIN 1 D VO VO D CUK Converter + + VC2 - VIN + VOUT - - D VO VIN 1 D Worst Case Conditions If it is desired that a converter operate in CCM at all times, it must be recognized that DCM occurs for low values of inductor currents. For regulated output applications, this condition is associated with large resistance (low current) loading, and/or high input voltages. Inductor values should be chosen accordingly, with appropriate safety factors. Low Voltage Applications For low output voltage applications (~ 1 v) the voltage drop associated with a freewheeling diode may be unacceptably high. In this case, the diode is replace by another active switching device with very low ON-resistance. Interleaving Converters Multiple converters can be operated in parallel with their switching waveforms delayed with respect to each other (phase shifted). This tends to smooth out the residual pulsation currents.
