A New Design of Robust Digital Controller for Dc-Dc Converters

2006 SICE-ICASE International Joint Conference

Nakano

et al. 2006

Self Cite

In recent years, digitization of all control parts in switching power supplies including PWM generators is progressing for demands such as intelligent performances and common use of hardware, etc. Then, a problem is in the resolution of digital PWM generators for improving control performances. Since the digital PWM generator is constituted using a counter, a carrier wave turns into a stairs wave, and step amplitudes is decided with a clock cycle. When the clock cycle is fixed, the resolution becomes low as the switching frequency becomes high. Consequently, the accuracy of output voltage becomes bad. In this paper, a method for remarkably improving the resolution of the digital PWM generator using the pulse composite technique is proposed. The method is realizable by some parts and easy computation, and is applied to the digital PWM generator built-in DSP. The usefulness and practicality are verified by experiments.

Section: Resolution Of Digital Pwm Generatormentioning

confidence: 99%

“…[1]- [4]. We have proposed a robust control of a DC-DC converter by a digital controller [4]. The digital controller was realized by DSP built-in PWM generator.…”

Section: Introductionmentioning

confidence: 99%

A Resolution Improving Method of Digital PWM using Pulse Composite Technique

Takegami¹,

2006 SICE-ICASE International Joint Conference

Nakano

et al. 2006

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“…When the lines long, it is necessary to design the controller in consideration of the sizes of the inductances. The authors proposed previously the robust digital controller when using LC filter as the noise removal filter of DC-DC converter [2], [3]. At remote sensing, the inductances of the lines must also be taken into consideration and it must be assumed that LCLC filter is connected.…”

Section: Introductionmentioning

confidence: 99%

Digital robust controller for DC-DC converter at remote sensing

Takegami

2008 SICE Annual Conference

Nakano

et al. 2008

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If the lines which connect the output terminal of DC-DC converter and the load are long, the voltage actually across load will be changed largely to produce the voltage drops by the impedances of the lines. Then, the terminal which senses the voltage across load is prepared apart from the output terminal of DC-DC converter, and it leads to the load, and the voltage across load is adjusted so that it is not changed largely. This method is called remote sensing. When the lines becomes long, the usual method of adjusting the voltage across load cannot suppress enough the change of it. In this paper, the robust digital controller for suppressing the change of the voltage across load is proposed. Experimental studies using DSP demonstrate that this type of digital controller is effective to suppress it.

“…However, the boost DC-DC converter used these conventional controllers cannot suppress output voltage variation caused by large load change. Robust control method using an approximate 2-degree-of-freedom (2DOF) controller for improving start-up characteristics and load sudden change characteristics of DC-DC converters has been proposed [4]. However, it was applied to a buck DC-DC converter.…”

Section: Introductionmentioning

confidence: 99%

Approximate 2-Degree-of-Freedom digital control for a boost DC-DC converter

Ohta

IEICE Electron. Express

2012

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Abstract:If a duty ratio and a load resistance in a boost DC-DC converter are changed, the characteristics is varied greatly, that is, the boost DC-DC converter has the non-linear characteristics. In many applications of DC-DC converters, loads cannot be specified in advance, and they will be changed suddenly from no load to full load. The boost DC-DC converter used a conventional controller cannot suppress output voltage variation caused by large load change. In this paper an approximate 2-Degree-of-Freedom (2DOF) digital controller for suppressing the output voltage variation at sudden load change is proposed. This controller is actually implemented on a micro-processor and is connected to the boost DC-DC converter. Experimental results demonstrate that this type of digital controller is effective to suppress the variation.