Abstract
A new step-up converter with an ultrahigh voltage conversion ratio is proposed in this paper. Two power switches of such a converter, which conduct synchronically, and its output voltage, which has common ground and common polarity with its input voltage, lead to the simple control circuit. No abrupt changes in the capacitor voltage and the inductor current of the proposed step-up converter mean that it does not suffer from infinite capacitor current and inductor voltage. Two input inductors with different values can still allow the proposed step-up converter to work appropriately. An averaged model of the proposed step-up converter was built and one could see that it was still fourth-order even with its five storage elements. Some theoretical derivations, theoretical analysis, Saber simulations, and circuit experiments are provided to validate the effectiveness of the proposed step-up converter.
Highlights
As part of a DC switching power supply, the step-up converter is important for transforming low input voltage into the desired high output voltage to satisfy the requirements of practical applications, such as photovoltaic (PV) systems, fuel-cell systems, etc
The typical time-domain waveforms for the inductor currents iL1 and iL2 and the pulse-width modulation (PWM) signal vd are plotted in Figure 3, where ILN, ILM, and ILN1 are the values of iL1 and iL2 at t = NT, t = (N + d + d11 )T, and t = (N + 1)T, respectively, and IL1P is the value of iL1 at t = (N + d + d11 )T
The typical time-domain waveforms for the inductor currents iL1 and iL2 and the PWM signal vd are plotted in Figure 3, where ILN, ILM, and ILN1 are the values of iL1 and iL2 at t = NT, t = (N + d + d11)T, and t = (N + 1)T, respectively, and IL1P is the value of iL1 at t = (N + d + d11)T
Summary
As part of a DC switching power supply, the step-up converter is important for transforming low input voltage into the desired high output voltage to satisfy the requirements of practical applications, such as photovoltaic (PV) systems, fuel-cell systems, etc. Under certain input voltages, if an extremely high output voltage is required, the duty cycle must be close to 1.0, and this cannot generally be achieved because of the limitations of real semiconductors. Like a boost converter, if an ultrahigh output voltage from those converters is required, the duty cycle D must be close to 1.0, and this cannot generally be achieved because of the limitations of real semiconductors. A new step-up converter with an ultrahigh voltage conversion ratio is proposed In this converter, the output voltage is common-grounded with the input voltage, and its two power switches conduct synchronically.
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