Current-mode control, five different types, used with the three basic classes of power converters: Small-signal AC and large-signal DC characterization, stability requirements, and implementation of practical circuits

Redl, R.; Sokal, Nathan O.

doi:10.1109/pesc.1985.7071020

Cited by 146 publications

(46 citation statements)

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“…This will incur into adding more components in the design, which will be undesired. For that matter, the proposal of this work is actually controlling the peak current value on the switch, just like in a peak current mode control (PCMC) [16]. Fig.…”

Section: Static Analysis Of the Dl//l Ac-led Drivermentioning

confidence: 99%

On Supplying LEDs From Very Low DC Voltages With High-Frequency AC-LED Drivers

Castro

Vázquez

Aller

et al. 2019

IEEE Trans. Power Electron.

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Abstract-This work studies the driving of white Light Emitting Diodes (LEDs) from very low voltages in the range of 1.2 to 2 V. The proposed idea is based on replacing the standard Schottky diode used in conventional converter topologies (i.e., buck, buck-boost and boost) with an LED, while shortcutting the output of the converter. In this configuration, the LED works both as the load and as the rectifier diode of the converter, hence, switching the LED at high frequencies (i.e. > 100 kHz). Moreover, a thorough analytical study is carried out for the two topologies rendered in this work. Particularly emphasizing their static analysis and the obtaining of the boundaries between the different conduction modes. Finally, the idea is validated experimentally by means of the boost converter variation (i.e., DL//S AC-LED driver). The DL//S AC-LED driver has also been compared with a dc-dc boost converter showing a better luminous efficacy while disposing of the Schottky diode and the output capacitor. This analysis is carried out when connected to a Li-Ion battery using a simple control and integrated circuit for its development.

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Section: Static Analysis Of the Dl//l Ac-led Drivermentioning

confidence: 99%

On Supplying LEDs From Very Low DC Voltages With High-Frequency AC-LED Drivers

Castro

Vázquez

Aller

et al. 2019

IEEE Trans. Power Electron.

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“…7 shows the block diagram of the dynamic ramp sampling the output voltage in the current-mode control for Buck converter. In the block diagram, the switches of the power stage are replaced with a three-terminal switching model [1]- [6], [12]- [14], in which the ideal transformer plays the role of the average duty cycle, and the two dependent sources model the perturbation of the duty cycle. According to the block diagram, transfer functions can be derived to analyze system stability.…”

Section: Conventional Ramp Compensation In Current-mode Control Fmentioning

confidence: 99%

Dynamic ramp with the invariant inductor in current-mode control for Buck converter

Chen

Liang

et al. 2013

2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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A dynamic ramp with the invariant inductor in currentmode control for Buck converter is proposed in this paper. This configuration maintains system stability under different input/output voltages without changing the inductor and compensation circuit. The dynamic ramp can be adjusted according to varied the output voltage or the voltage droop between the input voltage and the output voltage to maintain bandwidth and phase margin using the invariant inductor and compensation circuit. Finally, the dynamic ramp sampling the output voltage is implemented using MathCAD predictions, SIMPLIS simulation results, and experimental results to verify its viability and superiority.

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“…Except the DC operation, systems behave the same as the SCM implementation. 2 Different modulation schemes in current-mode control were summarize in [6], including peak current-mode control, valley current-mode control, constant on-time control, constant off-time control. The first two schemes belong to the constant-frequency modulation, and the rest belong to the variable-frequency modulation.…”

Section: (Abstract)mentioning

confidence: 99%

“…Current VR faces the stringent challenge of not only high current but also a strict transient response requirement. Current-mode control architecture is widely used to achieve constant-output impedance design to meet the load-line requirement [20] Current-mode control architecture is endowed with the capabilities of controlling both 6 the output voltage and the inductor current, which is one of key factors to achieve AVP control.…”

Section: Voltage Regulator Applicationmentioning

confidence: 99%

Unified three-terminal switch model for current mode controls

Yan

Lee

2010

2010 IEEE Energy Conversion Congress and Exposition

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(Abstract)Current-mode control architectures with different implementation approaches have been an indispensable technique in many applications, such as voltage regulator, power factor correction, battery charger and LED driver. Since the inductor current ramp, one of state variables influenced by the input voltage and the output voltage, is used in the modulator in current-mode control without any low pass filter, high order harmonics play important role in the feedback control. This is the reason for the difficulty in obtaining the small-signal model for current-mode control in the frequency domain. A continuous time domain model was recently proposed as a successful model for current-mode control architectures with different implementation. However, the model was derived by describing function method, which is very arithmatically complicated, not to mention time consuming. Although an equivalent circuit for a current mode control Buck converter was proposed to help designers to use the model without involving complicated math, the equivalent circuit is not a complete model. Moreover, no equivalent circuit for other topologies is available for designers. In this thesis, the primary objective is to develop a unified three-terminal switch model for current-mode control with different implementation methods, which are applicable in all the current mode control power converters.

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Current-mode control, five different types, used with the three basic classes of power converters: Small-signal AC and large-signal DC characterization, stability requirements, and implementation of practical circuits

Cited by 146 publications

References 0 publications

On Supplying LEDs From Very Low DC Voltages With High-Frequency AC-LED Drivers

On Supplying LEDs From Very Low DC Voltages With High-Frequency AC-LED Drivers

Dynamic ramp with the invariant inductor in current-mode control for Buck converter

Unified three-terminal switch model for current mode controls

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