02-02-2013, 04:53 PM
Interleaved Boost Converter with Ripple Cancellation Network
Interleaved Boost.docx (Size: 19.12 KB / Downloads: 26)
Abstract
This paper presents an interleaved boost converter (IBC) with ripple cancellation network (RCN). Based on the conventional IBC, two capacitors, two coupled inductors and two inductors are added as RCN in the proposed converter. Therefore, the proposed converter shares the same advantages of the conventional IBC and achieves input current ripple cancellation without significantly increases the current stress and loss of the converter. Finally, a 36V input voltage, 50V output voltage and 1kW output power prototype circuit operating at 100kHz is implemented in the laboratory to verify the expected performance. The proposed converter can achieve input current ripple cancellation in all power range with the efficiency higher than 96%. The simulation and experimental results show that the proposed interleaved boost converter with ripple cancellation network has great potential to be applied in high power, high efficiency dc/dc conversion.
INTRODUCTION
Interleaved Boost Converter (IBC) has been widely used in photovoltaic generation, electric vehicles and power factor correction due to its high power density and fast dynamic response [1]-[6].
The input current ripple of the conventional boost converter is inversely proportional to its input inductor value [7], which means that a large inductor value will result in low input current ripple; however, a large inductor value increases the total weight of the converter. On the other hand, since small inductor values increase the loss of the capacitor, a capacitor with low ESR must be used [8].
Interleaved parallel structure has been applied in many high power density applications [9]-[12] in order to minimize the input current ripple, reduce the passive component size, improve the transient response and increase the power level. The frequency doubling characteristic of the interleaved structure can significantly reduce the output capacitor value and the input current ripple of the converter, but the quality of input power supply will still be deteriorated by the input current ripple especially in the large current applications [13].
Coupled inductor IBC proposed in [14]-[19] has used a coupled inductor to achieve the input current ripple cancellation, and their applications can be found in [20]-[23]. However the leakage inductance of the coupled inductor increases the current stress of the output diodes, introducing extra EMI problems. A soft switching circuit for IBC is presented in [24]. It’s an attractive solution to avoid the major drawbacks of the coupled inductor; however, the control strategy of this circuit is too complex and not cost-effective.