Open‐loop transfer functions of buck–boost converter by circuit‐averaging technique

Abstract

This study shows the derivation of the power-stage transfer functions and input and output impedances of a buckboost pulse width-modulated (PWM) dc-dc converter operating in continuous-conduction mode. The expressions are derived using the small-signal model obtained by the circuit-averaging technique. Using the small-signal dynamic model, both transient and frequency domain characteristics are determined. An example buck-boost converter with the following specifications was considered: supply voltage 12 V, output voltage 5 V, switching frequency 200 kHz, and output power 10 W. The modification of the power-stage transfer function to include the time delay between the MOSFET gate drive and the duty cycle is considered and is modelled by the first-order Padè approximation. The theoretical predictions were verified by experiments and excellent agreement between the results was observed.

Performance Enhancement of Boost Converter for Solar Panels System using Genetic Algorithm

“…If the switch is opened as shown in figure (1-b) with OFF time equal to (1-D) T, the diode is conducted and the inductor started to discharge the energy stored, while the capacitor charged. So that, 𝑖 𝐿 be constant during this operation [12] as in equation below.…”

Influence of element’s parameters on the output characteristics of the voltage multiplier when powered from the inverter in resonance conditions

“…Unfortunately, the analytical description of small-signal transmittances presented in [8] and [11] is not verified experimentally. The small-signal averaged transmittances of the buck-boost converter are discussed in [21]. The results of [21] may be interesting, because the structure of buck-boost converter is similar to that of flyback.…”

“…The small-signal averaged transmittances of the buck-boost converter are discussed in [21]. The results of [21] may be interesting, because the structure of buck-boost converter is similar to that of flyback.…”