Automatic Multi-Operation Bumpless Mode Switching Type Digital Controller for PWM Power Amplifier Using Load Estimation

Kohji Higuchi; Ryosuke Okazaki; Koji Matsushita; Kazushi Nakano; Fumiho Chino; Kosin Chamnongthai; Damrong Amorndechaphon; Suttichai Premrudeepreechacharn

doi:10.37936/ecti-eec.200972.171903

Authors

Kohji Higuchi Dept. of Electronic Engineering, The University of Electro-Communications
Ryosuke Okazaki Dept. of Electronic Engineering, The University of Electro-Communications
Koji Matsushita NF Corporation
Kazushi Nakano Dept. of Electronic Engineering, The University of Electro-Communications
Fumiho Chino NF Corporation
Kosin Chamnongthai King Mongkut’s University of Technology Thonburi
Damrong Amorndechaphon Chiangmai University
Suttichai Premrudeepreechacharn Chiangmai University

DOI:

https://doi.org/10.37936/ecti-eec.200972.171903

Keywords:

DC-AC power amplifier, Automatic muliti-stage bumpless switching, Load estimation, Digital robust control

Abstract

Robust PWM power ampli¯ers whose transient response characteristics do not deteriorate against an extensive load change and/or direct-current power supply voltage change are needed. A digital robust controller with bumpless mode switching for PWM power amplifiers which can satisfy such demands has been proposed. In this paper a multi-stage switching
type digital controller is proposed for spreading capacitance load range more and improving transient characteristics for inductance load. In the previous proposed controller, the con¯guration of the controller is the same to all loads. At inductance load, there is a possibility that the transient characteristics may become bad and the speci¯cation may not be satisfied. Therefore, a load current is estimated at inductance load, and the controller which also uses load current for feedback is con¯gured. A inductance is estimated and a controller is switched to this controller bumplessly. In order to extend the range of capacitance load, a controller is increased from two stage to three stage, and these are switched to each other bumplessly. A DSP is implemented to this digital controller. It is demonstrated from experiments that the multi-stage switching type digital controller is realizable and the given speci¯cations are atisfied.

References

[1] H. Sugimoto, S. Morimoto and M. Yano, "A HIGH PERFORMANCE CONTROL METHOD OF A VOLTAGE-TYPE PWM CONVERTER", IEEE PESC'88 RECORD, pp.360-368, 1988.

[2] H. Fukuda and M. Nakaoka, "State-Vector Feedback Controlled-based 100kHz Carrier PWM Power Conditioning Ampli¯er and Its High Precision Current-Tracking Scheme", IEEE IECON'93, pp.1105-1110, 1993.

[3] K. Higuchi, K. Nakano, K. Araki and F. Chino, "The Robust Design of PWM Power Amplifier by the Approximate 2-Degree-of-Freedom Digital Integral Type Control System", IEEE IECON-2001, pp.1190-1194, 2001.

[4] K. Higuchi,K. Nakano, K. Araki and F. Chino, "NEW ROBUST CONTROL OF PWM POWER AMPIFIER," IFAC 15th Triennial World Congress(CD-ROM), 2002.

[5] K. Aida and T .Kitamori, "Design of a PI-Type State Feedback Optimal Servo System", Int. J. of Control, 52-3, pp.613-624, 1991.

[6] K. Higuchi, K. Nakano, K. Araki and F. Chino, "Robust Control of PWM Power Amplifier by Approximate 2-IEEE IECON'2003, 1852/1857(2003).

[7] K. Higuchi, K. Nakano, T. Kajikawa, K. Araki and F. Chino, "Robust Digital Control of PWM Power Ampli¯er by Approximate 2-Degree-of Freedom System with Bumpless Mode Switching," Proc.of IEEE CDC-2003, pp.6248-6253, 2003.

[8] K. MATSUSHITA, R. OKAZAKI, K. HIGUCHI, K. NAKANOo, T. KAJIKAWA and F. CHINO, "Automatic Multi-Stage Bumpless Mode Switching Type Digital Controller for PWM Power Amplifier using Load Estimation," Proc.of SICE-ICASE Joint Con. 2006, pp.702-707, 2006.

[9] R. OKAZAKI,K. MATSUSHITA, K. HIGUCHI, K. NAKANOo, T. KAJIKAWA and F. CHINO, "New Automatic Multi-Stage Bumpless Mode Switching Type Digital Controller for PWM Power Amplifier using Load Estimation," Proc.of ECTI-CON 2007, pp.325-328, 2007.