A High-Voltage-Gain DC-DC Converter Based on Modified son Charge Pump Voltage Multiplier
Abstract
A high-voltage-gain dc-dc converter is introduced in this paper. The proposed converter resembles a two-phase interleaved boost converter on its input side while having a son charge pump based voltage multiplier on its output side. This converter offers continuous input current which makes it more appealing for the integration of renewable sources like solar panels to a 400-V dc bus. Also, the proposed converter is capable of drawing power from either a single source or two independent sources. Furthermore, the voltage multiplier used offers low voltage ratings for capacitors which potentially leads to size reduction. The converter design and component selection has been discussed in detail with supporting simulation results. A hardware prototype of the proposed converter with V in =20V and V =400V has been developed to validate the analytical results.
EXISTING SYSTEM:
High-voltage-gain dc-dc converters using a boost stage followed by voltage multiplier (VM) cells have been proposed. Table I summarizes these converters based on their individual component count, voltage gain, and voltage stress on their switches. The second order hybrid boosting converter proposed offers relatively low voltage gain in comparison to its voltage multiplier component count. It also has a very large input current ripple in proportion to its average. High step-up converters using single-inductor-energy-storage-cell-based switched capacitors proposed do not offer voltage gains high enough to boost a 20V input to 400V at an reasonable switching duty cycle. The multiple-inductor-energy-storage-cell-based switched capacitor based high voltage converters offer a relatively low voltage gain in proportion to its component count. The switched-capacitor-based active-network converter proposed has a discontinuous input current ripple due to the series and parallel connection of the inductors in its two modes of operation. The transformer-less high-gain boost converter proposed in offers continuous input current but the switches experience a high voltage stress – more than 2/3 rd of its output voltage.
PROPOSED SYSTEM:
A high-voltage-gain dc-dc converter based on the modified son charge pump voltage multiplier circuit is introduced in this paper. This converter is capable of stepping up voltages as low as 20V to 400V. The proposed converter offers continuous input current and low voltage stress (1/4 of its output voltage) on its switches. This converter can draw power from a single source or two independent sources while having continuous input currents, which makes it suitable for applications like solar panels. Compared to the topology presented, the proposed converter requires lower voltage rating capacitors for its VM circuit and also one less diode. The inductors and switches experience identical current stresses making the component selection process for the converter simpler.
CONCLUSION
In this paper, a high-voltage-gain dc-dc converter is introduced that can offer a voltage gain of 20, i.e., to step up a 20V input to 400V output. The proposed converter is based on a two-phase interleaved boost and the modified son charge pump voltage multiplier circuit. It can draw power from a single source as well as from two independent sources while offering continuous input current in both cases. This makes the converter well suited for renewable applications like solar. The proposed converter is symmetric, i.e., the semiconductor components experience same voltage and current stresses which therefore reduces the effort and time spent in the component selection during the system design. The proposed converter has smaller voltage multiplier capacitors compared to a reference converter based on son charge pump voltage multiplier cells; hence it is smaller in size. The converter finds its application in integration of individual solar panels onto the 400V distribution bus in datacenters, telecom centers, dc buildings and microgrids.
REFERENCES
[1] V. A. K. Prabhala, B. P. Baddipadiga, and M. Ferdowsi, “DC distribution systems – An overview,” in Renewable Energy Research and Application (ICRERA), 2014 International Conference on, 2014, pp. 307-312.
[2] G. AlLee and W. Tschudi, “Edison Redux: 380 Vdc Brings Reliability and Efficiency to Sustainable Data Centers,” Power and Energy Magazine, IEEE, vol. 10, pp. 50-59, 2012.