Closed Loop Control of Non-Isolated High Step-up Converter with Low Voltage Stress of Semiconductors
Many of these conventional DC–DC converters have the disadvantages of operating at high duty-cycle, high switch voltage stress and high diode peak current. The conventional boost high step-up converter can provide very high voltage gain without operating at high duty-cycle by employing a coupled inductor, a switched capacitor and an additional diode. Non-isolated high step up converter overcomes this drawback. This converter reduces voltage stress on switch and diode by using additional one capacitor and rearranging components in conventional single switch high step-up converter. At the same time, the switch voltage stress is reduced greatly, which is helpful to reduce the conduction losses by using low power rated components and efficiency will increase. Single switch is used in the non-isolated high step up converter, thus reduce the entire cost of the converter. This non-isolated high step-up converter is used in many applications such as renewable energy system using low voltage energy sources such as fuel cells, solar panels, photo voltaic cell. This converter has low voltage stress and high efficiency with low rated power components. The reverse-recovery energy of the output diode and the leakage inductance energy are recycled. The converter has high efficiency under entire load conditions due to the low conduction loss. Single switch is used in the non-isolated high step up converter, thus reduce the entire cost of the converter. The simulation of the circuit with 12 V input, 120V15W output is done using PSIM.
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