Control circuit design of the L-LC resonant inverter for induction heating

Author

Espí, J.M. ; Navarro, A.E. ; Maicas, J. ; Ejea, J. ; Casans, S.

Author_Institution

Dept. of Electr. Eng., Valencia Univ., Spain

Volume

3

fYear

2000

fDate

2000

Firstpage

1430

Abstract

In this article, the frequency variation control strategy for an induction heating L-LC resonant inverter is analyzed. The control consists of three loops, which are analyzed and reduced to their corresponding small-signal block diagrams. From these diagrams, the optimal structure of the compensation network and the design boundaries for first order closed-loop response are derived. The special case of phase limitation is analyzed because it is unstable in open-loop operation. Finally the implementation of the control circuit is described and experimental results are shown

Keywords

DC-AC power convertors; closed loop systems; control system analysis; control system synthesis; electric current control; frequency control; induction heating; invertors; phase control; resonant power convertors; stability; switching circuits; voltage control; L-LC resonant inverter; compensation network; control circuit design; control design; control performance; control simulation; design boundaries; first order closed-loop response; frequency variation control strategy; induction heating; open-loop operation instability; phase limitation; small-signal block diagrams; Circuit synthesis; Current control; Heating; Open loop systems; Oscillators; Resonance; Resonant frequency; Resonant inverters; Temperature control; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 2000. PESC 00. 2000 IEEE 31st Annual

Conference_Location

Galway

ISSN

0275-9306

Print_ISBN

0-7803-5692-6

Type

conf

DOI

10.1109/PESC.2000.880518

Filename

880518