Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1987-12-04
1989-09-19
Salce, Patrick R.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 98, 363132, H02M 3335
Patent
active
048687286
ABSTRACT:
A regulator system for a switching mode inverter generator feeding an inductively coupled load and seeing the load as a series resonant circuit having a resonant frequency which varies with its magnetic state comprises two switches which connect the load to the output of the inverter. Each switch comprises a switching element and switching terminals. A diode shunts the switching terminals of each switching element of each switch. A control loop slaves the output frequency of the inverter to the resonant frequency of the load. A second control loop is responsive to the inverter power output or the inverter supply voltage. The system is suitable for inductive heating furnaces as used in industry.
REFERENCES:
patent: 3596165 (1971-07-01), Andrews
patent: 3806688 (1974-04-01), Mackenzie et al.
patent: 4541041 (1985-09-01), Park et al.
patent: 4626978 (1986-12-01), Thouvenin
J. M. Thouvenin, "Thyristor Inverter for Induction Heating", Electronique Industrielle, 3/82, pp. 23-24.
King et al., "Inherent Overload Protection for the Series Resonant Converter", IEEE Transactions on Aerospace and Electronic Systems, 11/83, pp. 820-828.
Cheron et al., "Study of a New Use for Power Transistors in High Voltage Converters with High Frequency", ReVue de Physique Appliquee, 6/81, pp. 333-342.
Peckman Kristine
Salce Patrick R.
Service National Electricite de France
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