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자료유형
학술저널
저자정보
저널정보
대한전기학회 Journal of Electrical Engineering & Technology Journal of Electrical Engineering & Technology Vol.1 No.1
발행연도
2006.3
수록면
63 - 72 (10page)

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The purpose of this paper is to address the negative impedance instability in DC/DC converters. We present the negative impedance instability of PWM DC/DC converters loaded by constant power loads (CPLs). An approach to design digital controllers for DC/DC converters is presented. The proposed method, called Power Alignment control technique, is applied to DC/DC stepdown choppers operating in continuous conduction or discontinuous conduction modes with CPLs. This approach uses two predefined state variables instead of conventional pulse width modulation (PWM) to regulate the output voltage. A comparator compares actual output voltage with the reference and then switches between the appropriate states. It needs few logic gates and comparators to be implemented, thus, making it extremely simple and easy to develop using a low-cost application specific integrated circuit (ASIC) for converters with CPLs. Furthermore, stability of the proposed controllers using the small signal analysis as well as the second theorem of Lyapunov is verified. Finally, simulation and analytical results are presented to describe and verify the proposed technique.

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Abstract
1. Introduction
2. Negative Impedance Instability in Pwm Dc/Dc Converters
3. Power Alignment Digital Control Technique
4. Stability Analysis
5. Simulation Results Of Applying Proposed Technique To The Buck Converter with Constant Power Loads
6. Conclusion
References

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