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To analyse the stable operation range with varied input and output voltages, bifurcation behaviours and operation region of current-mode-controlled single-inductor dual-output (SIDO) boost converter are investigated. The inductor current borders and one-dimensional discrete-mapping model are deduced firstly. On the basis of the model, the bifurcation diagram and corresponding Lyapunov exponent spectrum...
The discrete mapping model of current-mode controlled buck converter with constant current load, taking account of composite output capacitors (parallel connection of two different types of capacitor branches, i.e. electrolytic capacitors and ceramic capacitors), is established. Based on the model, dynamical effects of varying output capacitance and equivalent series resistance (ESR) are investigated...
In this paper, a new control strategy—fixed freewheeling-time (FFT) control technique for DC-DC converter with fast transient response and high efficiency are studied. The operation of FFT control technique is described. The small signal model of FFT controlled buck converter operating in pseudo-continuous conduction mode (PCCM) is derived, with frequency-domain analysis of the closed-loop control-to-output,...
This paper presents two novel ripple-based I2 type control techniques, I2 constant off-time (I2-CFT) control and I2 constant on-time (I2-COT) control applied for buck converters with constant current output, as well as the detailed introduction of their operating principles and calculation of critical equivalent series resistance (ESR). Afterwards, the merits and weaknesses among the conventional...
Inspiring by the advantages of digital peak voltage (DPV) control and digital average current (DAC) control, the digital average voltage (DAV) control for switching DC-DC converter is proposed and investigated. Taking buck converter as an example, DAV control algorithm is analyzed in detail. In order to explore the stability of system, the z-domain transfer function is deduced, by which the critical...
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