Modified voltage‐mode controller for the quadratic boost converter with improved output performance

Abstract

The control of the quadratic boost converter with unknown load resistance and where only the output voltage is used for feedback purposes is addressed. In the existing voltage-mode controlled converter system, there exists a performance 'trade-off' between the transient responses after the onset of a reference input and a load disturbance due to the usage of the traditional proportional-integral control scheme. To overcome these problems, a modified voltage-mode controller is proposed. The proposed controller uses a normalised integral action in which the derivative of the integrand is bounded by a user-defined constant. The approximate stability analysis of the resultant voltage-mode controlled quadratic boost converter system is carried out to gain some insight into its closed-loop behaviour. Some simulation and experimental results comparing the performance of the proposed controller with that of the existing controller are also provided to show the improvements obtained using the proposed controller.

Quadratic boost converter with low‐output‐voltage ripple

“…From the equilibrium point described in (6)–(8), it can be observed that the proposed converters have the same current through inductors compared with converters in Fig. 1 [8–15], but capacitors are charged at different voltage levels. Table 1 shows a comparison of voltage in capacitors.…”

“…Other plausible solutions may be found based on magnetic coupling [6,7]. Another alternative is the use of quadratic gain converters [8][9][10][11][12][13][14][15].…”

“…Several topological modifications of the QBC have been investigated [3][4][5][6][7][8][9][10][11][12][13][14][15]. Fig.…”

Implementation of a common grounded Z‐source DC–DC converter with improved operation factors

“…To achieve the minimum size of L 2 , a similar analysis should be done. The only difference is in their average current equations ( 14and (19)). Thus, the equation of L 2 min is…”

“…The methods include switched-inductor and switched capacitor techniques to increase the voltage gain of different converters [4,[13][14][15]. In addition, using interleaved configuration causes high-voltage gain and reduction of voltage stress [16][17][18][19]. Although the methods have advantages, they are costly and bulky and that encourage researchers to present new converters with novel configurations.…”