Analysis Of Interleaved Buck Converter

1389 Words3 Pages

The interleaved buck converter with continuous supply current has been shown in Fig.3. The topology consists of two input capacitors Cin1 and Cin2, two switches Q1 and Q2 which are triggered 180 degrees apart, two freewheeling diodes D1 and D2, two phase inductors L1 and L2, an output inductor Lo and an output capacitor Co. The voltage stress experienced by the switches and diodes are reduced due to the presence of the input capacitors. In the interleaved structure the current flowing through the two phases must be equal. This converter does not require any additional current sharing control block since the current through the phases are balanced. Fig. 3: Circuit configuration of the interleaved buck converter with continuous supply current
In the case of high step-down and high frequency applications the conventional interleaved buck converter suffers from the disadvantage of low on-time. Thus, the IBC operates with lower efficiency when operated at higher switching frequency. The voltage conversion ratio of the conventional IBC and buck converter is equal to the duty ratio D whereas the …show more content…

It can be viewed from the Fig.6(a) that a constant 24V output has been obtained and also a continuous input current has also been obtained. Also, the output ripple current has been greatly reduced. Fig. 6(b) shows the input capacitor currents and the inductor current IL0, IL1 and IL2. Fig. 6(c) shows the voltage and current stress experienced by the switches and Fig. 6(d) shows the voltage and current stress experience by the diodes. The voltage stress experienced by the diodes and the switches is approximately equal to 110 V, i.e., the voltage stress present across the semiconductor devices is less than the input voltage whereas in the conventional interleaved buck converter, the voltage stress of the semi-conductor devices are equal to the input

Open Document