Flux equalized transformer circuit

• US 6,469,486 B1
• Filed: 04/03/2000
• Issued: 10/22/2002
• Est. Priority Date: 05/28/1998
• Status: Expired due to Term

• Current Assignee: DET International Holding Limited (Delta Electronics Incorporated)
• Original Assignee: Ascom Energy Systems AG (Delta Electronics Incorporated)
• Inventors: Jitaru, Ionel
• Primary Examiner(s): STERRETT, JEFFREY L
• Application Number:
  US09/542,068
• Time in Patent Office: 932 Days
• Field of Search: 323/356, 323/361
• US Class Current: 323/356
• CPC Class Codes: H01F 27/06 Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type
• CPC Class Codes: H05K 1/0203 Cooling of mounted components H05K1/0272 takes precedence
• CPC Class Codes: H05K 1/0206 by printed thermal vias
• CPC Class Codes: H05K 1/05 Insulated conductive substrates, e.g. insulated metal substrate
• CPC Class Codes: H05K 1/165 incorporating printed inductors
• CPC Class Codes: H05K 2201/066 Heatsink mounted on the surface of the printed circuit board [PCB]
• CPC Class Codes: H05K 2201/086 for inductive purposes, e.g. printed inductor with ferrite core
• CPC Class Codes: H05K 2201/09054 Raised area or protrusion of metal substrate
• CPC Class Codes: H05K 2201/09063 Holes or slots in insulating substrate not used for electrical connections
• CPC Class Codes: H05K 2201/09572 Solder filled plated through-hole in the final product
• CPC Class Codes: H05K 2201/09745 Recess in conductor, e.g. in pad or in metallic substrate
• CPC Class Codes: H05K 2201/10166 Transistor
• CPC Class Codes: H05K 3/0061 onto a metallic substrate, e.g. a heat sink heat sinks for electric apparatus H05K7/20
• CPC Class Codes: H05K 7/209 Heat transfer by conduction from internal heat source to heat radiating structure H05K7/20909 takes precedence
• CPC Class Codes: Y10T 29/49165 by forming conductive walled aperture in base

Abstract

A transformer group in which a multitude of transformers are used to supply energy to a single load. The transformers are connected in series; in order to assist in providing a “flux equalizing” affect, the invention includes a flux equalizer circuit. The flux equalizer circuit provides a series of flux windings. Each flux winding is associated with a single transformer. The windings are arranged in parallel. In this manner, a balancing of the output of the transformers is obtained; the power output from each transformer is “sensed” by its associated flux winding which is “shared” with the other transformers via their own associated flux winding. Power is process then through the secondary windings, rectifiers, and output filters to a common load.

Claims

1. A flux equalizer circuit, comprising:

a) a first flux winding positioned to have an electrical flow induced therein when electrical energy flows through a first transformer; and

b) a second flux winding positioned to have an electrical flow induced therein when electrical energy flows through a second transformer, said second flux winding having a first end and a second end, the first end of said second flux winding being electrically connected to the second end of said first flux winding, and the second end of said second flux winding being electrically connected to the first end of said first flux winding such that current induced within the flux equalizer circuit freely flows between said first flux winding and said second flux winding.

2. The flux equalizer circuit according to claim 1, wherein the first transformer has a first primary winding, a first side of the first primary winding being connected to a power source, and a first secondary winding positioned to have an electrical flow induced in the first secondary winding when electrical energy flows through the first primary winding, wherein the second transformer has a second primary winding, a first side of the second primary winding being connected to a power source, and a second side of the second primary winding being connected to a second side of the first primary winding, the flux equalizer circuit further comprising a load, wherein said first and second secondary windings communicate electrical energy to said load.

3. The flux equalizer circuit according to claim 2, further comprising a first rectifier circuit imposed between the first secondary winding and said load, and a second rectifier circuit imposed between the second secondary winding and said load.

4. The flux equalizer circuit according to claim 3, further comprising a first filter element imposed between said first rectifier circuit and said load, and a second filter element imposed between said second rectifier circuit and said load.