Advanced Control for Very Fast DC-DC Converters Based on Hysteresis of the ${C}_{out}$ Current

Huerta, Santa C.; Trescastro-López, Eva María; Alou, P.; Oliver, J. A.; García, O.; Cobos, J.A.

doi:10.1109/tcsi.2012.2209308

Cited by 37 publications

(18 citation statements)

References 17 publications

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“…1) Measurement of the Current Through the Output Capacitor: The current through the output capacitor is measured by adding a parallel RLC network [3], [4]. The actual implementation is done by means of a trans-impedance amplifier but, for the analysis of the control, it is sufficient to consider only the equivalent parallel RLC network.…”

Section: A Discrete Modeling Of V 2 I Cmentioning

confidence: 99%

“…The control techniques presented in [1] and [2] are, therefore, equivalent under load transients since the voltage reference acts as a constant offset under load perturbations. The current through the output capacitor is sensed indirectly with a trans-impedance amplifier [3], [4] (see Fig. 3) in order not to change the impedance of the output capacitor.…”

Section: Introductionmentioning

confidence: 99%

“…4). The correspondence between the components of the current sensor and the RLC equivalent network are detailed in [3], [4].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Accurate Analysis of Subharmonic Oscillations of <formula formulatype="inline"><tex Notation="TeX">$V^2$</tex></formula> and <formula formulatype="inline"><tex Notation="TeX">$V^2I_c$</tex></formula> Controls Applied to Buck Converter

Cortés

Šviković

Alou

et al. 2015

IEEE Trans. Power Electron.

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V 2 I c control provides very fast dynamic performance to the Buck converter both under load steps and under voltage reference steps. However, the design of this control is complex since it is prone to subharmonic oscillations and several parameters affect the stability of the system. This paper derives and validates a very accurate modeling and stability analysis of a closed-loop V 2 I c control using the Floquet theory. This allows the derivation of sensitivity analysis to design a robust converter. The proposed methodology is validated on a 5-MHz Buck converter. The work is also extended to V 2 control using the same methodology, showing high accuracy and robustness. The paper also demonstrates, on the V 2 control, that even a low bandwidth-linear controller can affect the stability of a ripple-based control.Index Terms-Control of dc/dc converters, ripple based, robustness, V2, V2Ic.

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Section: A Discrete Modeling Of V 2 I Cmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Accurate Analysis of Subharmonic Oscillations of <formula formulatype="inline"><tex Notation="TeX">$V^2$</tex></formula> and <formula formulatype="inline"><tex Notation="TeX">$V^2I_c$</tex></formula> Controls Applied to Buck Converter

Cortés

Šviković

Alou

et al. 2015

IEEE Trans. Power Electron.

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“…7 shows the implemented transient detector for the reduction of t0. By applying the differentiator reported in [7], once the differentiated output signal (Vd), exceeds the threshold voltage (VCH or VCL) of the mode selector, the transient detector activates the PWM signal through an OR-gate. In this manner, the worst t0 is reduced from nearly one switching period to merely the circuit delay which mainly comes from the detection circuit and the deadtime driver.…”

Section: System and Circuit Designmentioning

confidence: 99%

An undershoot/overshoot-suppressed current-mode buck converter with voltage-setting control for type-II compensator

Wang

Huang

Fang

et al. 2015

2015 IEEE Asian Solid-State Circuits Conference (A-Sscc)

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Current-mode control is frequently used in dc-dc buck converters. Many current-mode buck converters apply type-II compensators for obtaining high loop gain to reduce the steadystate error and maintaining the loop stability with restricted bandwidth. However, when large load-current transients occur, significant transient undershoot/overshoot is generated due to the restricted loop bandwidth. In response, a type-II compensator with the proposed voltage-setting control (VSC) is presented in this paper. By simply setting the voltage of the compensation capacitor and the input voltage of the compensator, the proposed VSC, which is activated by a transient detector, greatly suppresses the transient undershoot and overshoot. Implemented , this work occupies 0.91mm 2 including pads, and features a peak efficiency of 96.3%. With the proposed method, the maximum undershoot and overshoot are respectively suppressed from 150mV to 58mV and 92mV to 62mV for ± 1A load current steps.

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“…Furthermore, some ripple-based controls sense the inductor current [2,3] or the capacitor current [4,5,6] by introducing a lossless network that matches the time constant of a passive element, including parasitic elements. For example, for a good sense of the capacitor current the time constants of a real capacitor (including capacitance, series-resistance and seriesinductance) need to be matched [7].…”

Section: Introductionmentioning

confidence: 99%

An optimization algorithm to design fast and robust analog controls for Buck converters

Cortés

Šviković

Alou

et al. 2014

2014 IEEE 15th Workshop on Control and Modeling for Power Electronics (COMPEL)

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Ripple-based controls are popular to achieve a fast dynamic response, but the design of these controls assuring robustness is not easy due to its intrinsic nonlinear nature. These techniques often rely on sensing networks heavily dependent on parasitic elements to estimate the inductor current or the capacitor current. Consequently, a modeling technique that takes into account these sensors and parasitic elements is needed. This paper proposes an optimization algorithm to design a wide variety of controls that can take into account the parasitic elements and tolerances of the converter. The proposed algorithm can be used to design very fast controls that are also robust in a real-world implementation. This algorithm is verified on a 300kHz Buck converter with Voltage mode and a 1.3MHz Buck converter with V 2 Ic control.

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Advanced Control for Very Fast DC-DC Converters Based on Hysteresis of the ${C}_{out}$ Current

Cited by 37 publications

References 17 publications

Accurate Analysis of Subharmonic Oscillations of <formula formulatype="inline"><tex Notation="TeX">$V^2$</tex></formula> and <formula formulatype="inline"><tex Notation="TeX">$V^2I_c$</tex></formula> Controls Applied to Buck Converter

Accurate Analysis of Subharmonic Oscillations of <formula formulatype="inline"><tex Notation="TeX">$V^2$</tex></formula> and <formula formulatype="inline"><tex Notation="TeX">$V^2I_c$</tex></formula> Controls Applied to Buck Converter

An undershoot/overshoot-suppressed current-mode buck converter with voltage-setting control for type-II compensator

An optimization algorithm to design fast and robust analog controls for Buck converters

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