A method and system for alternating current regulation

(19)

(11)

EP 1 465 037 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	12.01.2005 Bulletin 2005/02

(43)	Date of publication A2:
	06.10.2004 Bulletin 2004/41

(21)	Application number: 04076919.2

(22)	Date of filing: 29.12.1999

(51)	International Patent Classification (IPC)⁷: G05F 1/12

(84)	Designated Contracting States:
	DE FR GB

(30)

Priority:

30.12.1998 US 114195 P

(62)	Application number of the earlier application in accordance with Art. 76 EPC:
	99967731.3 / 1155358

(71)	Applicant: ADVANCED ENERGY INDUSTRIES, INC.
	Fort Collins, CO 80525 (US)

(72)	Inventors:
	Schatz, Douglas S. Fort Collins, CO 80524 (US) Scholl, Richard A. Fort Collins, CO 80526 (US) Drummond, Geoffrey N. Fort Collins, CO 80526 (US) Christie, David J. Fort Collins, CO 80525 (US)

(74)	Representative: Elmeros, Claus et al
	Patentgruppen ApS, Arosgaarden, Aaboulevarden 31 8000 Aarhus C 8000 Aarhus C (DK)

(54)	A method and system for alternating current regulation

(57) Circuitry and methods for regulating alternating current regulation uses energy storage and release principles to boost or buck voltage to permit regulated ac operation with parallel and series bi-directional switch elements (12) and (13) operated at either variable duty cycles or frequencies to accommodate bipolar ac operation. Each bi-directional switch element may include a diode bridge (8) or (10) and directionally limited switches such as semiconductor switches. The system can be used to regulate ac even during sub-cycle dips, can be used to simulate controlled dips, can be used to correct power factor for loads, and can be applied in multiphase operations.

Search report