Abstract
In this paper, a new, high step-up quadratic boost converter with high conversion efficiency is discussed. A storage capacitor and resonant inductor are connected in series with a clamp capacitor through a diode. These compose a voltage multiplier cell, which is applied on the switch of the quadratic boost converter. The clamp capacitor can protect the switch from a voltage spike and absorb energy when the switch turns off; then, the storage capacitor and resonant inductor are charged by the energy stored in the clamped capacitor to increase the voltage transfer gain. In addition, the voltage multiplier cell can also reduce the voltage stresses of power devices. Then, a 16 V input, 200 V output prototype with 80 W nominal power is built up and tested. Furthermore, a finite time fast terminal sliding mode (NFTSM) control is proposed, with constant frequency for the voltageFundamental Building B213:tracking control of this converter. The new NFTSM is obtained by introducing an adjustable nonlinear term into fast terminal sliding mode (FTSM) control, and a singularity problem is avoided. The experiment illustrates that the maximum efficiency of the proposed converter achieves 95% at D = 0.25 , V o = 150 V. The voltage stress is reduced to half of the corresponding component of the basic boost converter at the same voltage level. Moreover, the proposed NFTSM controller can track the reference signal, and provide a short settling time of about 48 ms with no overshoot, and the system response exhibits strong robustness against 11.7% input voltage disturbance and 30% load variation.
Highlights
The fast development of electronics products, such as solar energies, uninterruptible power supplies (UPS), and electric automobiles have been witnessed [1,2,3]
Due to a low and varying input voltage of these applications, the boost converter is a convenient solution for step-up conversion
To design the proposed finite sliding mode controller for the converter, the output voltage Vo was set as the control variable
Summary
The fast development of electronics products, such as solar energies, uninterruptible power supplies (UPS), and electric automobiles have been witnessed [1,2,3]. Due to a low and varying input voltage of these applications, the boost converter is a convenient solution for step-up conversion It is difficult for the conventional converter to provide such a high direct-current (DC) voltage gain. The variational switching frequency still exists, which may induce power losses and the electromagnetic interference (EMI) problem To avoid this disadvantage, a fixed frequency SMC had been proposed [18,19] that can provide a constant operation frequency against external disturbances. Afterwards, a terminal sliding mode (TSM) control characterized by a nonlinear sliding mode was developed to guarantee finite-time convergence [20] It can speed up the convergence rate near the equilibrium point, bringing about improved transient performance. Vin represents the input voltage source, and Vs denotes the driving signal of the switch (Q), especially
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