Mixed-signal PI controller in current-mode DC-DC buck converter for automotive applications

A new single-input multiple-output (SIMO) converter is proposed in this work by incorporating flyback and buck converters in a master–slave configuration. The objective of this work is to address the cross regulation problem, achieve tight voltage regulation, improve the circuit form factor and attain a fast transient response for a SIMO flyback converter. The flyback converter maintains the output channels within 10% of their rated voltages and the SIMO buck converter is placed in series with the flyback converter such that it compensates for the output voltage deviation. Moreover, a time multiplexing switching scheme decouples output channel to eliminate the cross-regulation problem and remove the need for an additional winding transformer per each output channel. A type II compensator with a peak current mode controller was designed to achieve faster transient response which is critical for the proposed configuration. A thorough steady-state analysis was carried out on a triple output channel topology to obtain the design criteria and component values. MATLAB/Simscape modelling and simulation was used to validate the effectiveness of the proposed converter with the result yielding satisfactory transience even with load disturbance. Additionally, the result of the proposed converter is compared with previously published works.

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COMPLEX DYNAMICS AND FAST-SLOW SCALE INSTABILITY IN CURRENT-MODE CONTROLLED BUCK CONVERTER WITH CONSTANT CURRENT LOAD

International Journal of Bifurcation and Chaos ◽

10.1142/s0218127413500624 ◽

2013 ◽

Vol 23 (04) ◽

pp. 1350062 ◽

Cited By ~ 10

Author(s):

GUOHUA ZHOU ◽

BOCHENG BAO ◽

JIANPING XU

Keyword(s):

Complex Dynamics ◽

Period Doubling ◽

Current Mode ◽

Input Voltage ◽

Second Order ◽

Buck Converter ◽

Constant Current ◽

Current Load ◽

Time Model ◽

Conduction Mode

The complex dynamics and coexisting fast-slow scale instability in current-mode controlled buck converter with constant current load (CCL), operating in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM), are investigated in this paper. Via cycle-by-cycle computer simulation and experimental measurement of current-mode controlled buck converter with CCL, it is found that a unique fast-slow scale instability exists in the second-order switching converter. It is also found that a unique period-doubling accompanied by Neimark–Sacker bifurcation exists in this simple second-order converter, which is different from period-doubling or Neimark–Sacker bifurcations reported previously. Based on a nonlinear discrete-time model and the corresponding Jacobian, the effects of CCL and input voltage on the dynamics of current-mode controlled buck converter are investigated and verified theoretically. Fixed point analysis for slow-scale low-frequency oscillation is also given to verify the dynamics and the coexisting fast-slow scale instability.

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Comparison between peak and an improved one-cycle current mode control of a buck converter power stage

10.1109/cas52836.2021.9604139 ◽

2021 ◽

Author(s):

Eduard Vladu ◽

Nicolae Braic ◽

Marius Neag ◽

Ovidiu Pop

Keyword(s):

Current Mode ◽

Buck Converter ◽

Current Mode Control ◽

Mode Control ◽

Power Stage

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Duomode non-linear state space averaged SPICE model of a current mode buck converter

10.1109/apec.1988.10550 ◽

2003 ◽

Cited By ~ 1

Author(s):

J.E. Chen ◽

F.D. Rodriguez

Keyword(s):

State Space ◽

Current Mode ◽

Buck Converter ◽

Spice Model ◽

Non Linear ◽

Linear State ◽

A Current

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Application of Digital Control Techniques for Satellite Medium Power DC-DC Converters

International Journal of Electronics and Telecommunications ◽

10.2478/v10177-011-0011-1 ◽

2011 ◽

Vol 57 (1) ◽

pp. 77-83 ◽

Cited By ~ 4

Author(s):

Konrad Skup ◽

Paweł Grudziński ◽

Piotr Orleański

Keyword(s):

Digital Control ◽

High Speed ◽

Control Process ◽

Digital Signal ◽

Current Mode ◽

Power Converter ◽

Buck Converter ◽

Research Centre ◽

Analog To Digital ◽

Control Techniques

Application of Digital Control Techniques for Satellite Medium Power DC-DC Converters The objective of this paper is to present a work concerning a digital control loop system for satellite medium power DC-DC converters that is done in Space Research Centre. The whole control process of a described power converter is based on a high speed digital signal processing. The paper presents a development of a FPGA digital controller for voltage and current mode stabilization that was implemented using VHDL. The described controllers are based on a classical digital PID controller. The converter used for testing is a 200 kHz, 750W buck converter with 50V/15A output. A high resolution digital PWM approach is presented. Additionally a simple and effective solution of filtering of an analog-to-digital converter output is presented.

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