Pulse type transformer with increased coupling coefficient through configuration of plural primary windings

• US 20060049903A1
• Filed: 09/03/2004
• Published: 03/09/2006
• Est. Priority Date: 09/03/2004
• Status: Active Grant

• Current Assignee: Kirk W. Wolfgram
• Original Assignee: Kirk W. Wolfgram
• Inventors: Wolfgram, Kirk W.
• Granted Patent: US 7,148,779 B2
• Time in Patent Office: Days
• US Class Current: 336/180
• CPC Class Codes: H01F 19/08 Transformers having magnetic bias, e.g. for handling pulses
• CPC Class Codes: H01F 27/2823 Wires H01F27/2866 takes precedence
• CPC Class Codes: H01F 30/04 having two or more secondary windings, each supplying a separate load, e.g. for radio set power supplies
• CPC Class Codes: H01F 41/082 Devices for guiding or positioning the winding material on the former
• CPC Class Codes: H01F 41/122 Insulating between turns or between winding layers

Abstract

The present invention provides a low duty cycle, high current DC pulse type transformer with increased coupling coefficient between the primary and secondary windings by changing the proximity of the primary windings to the secondary windings through a plurality of primary windings separated by layers of secondary windings thus reducing the average distance between the primary windings and secondary windings. In addition to the increased coupling coefficient, the invention provides a reduction in electrical potential between primary windings and secondary windings through an electrical connection between the primary winding and a tap within the secondary winding. The invention significantly increases the coupling coefficient in applications where the transformer'"'"'s core becomes saturated due to the high peak current typically found in capacitive discharge type circuits such as those used in electric fence controllers, strobe circuits, and high performance ignition systems for automobile, marine, or motorcycle engines.

Claims

1. A high current DC pulse type transformer for connection to a high pulse current or capacitive discharge type circuit where the transformer is provided with a plurality of primary windings where:

the primary and secondary windings are wound around a common leg of the transformer'"'"'s core;

the transformer'"'"'s core becomes saturated due to the level of pulse current;

the transformer'"'"'s duty cycle is significantly small;

the primary windings are electrically connected to the secondary windings;

the primary winding is provided in more than one layer where the layers are physically separated from each by layers of the secondary winding; and

an efficiency that exists without the presence of the transformer'"'"'s core that is significant due to primary winding'"'"'s proximity to the secondary winding.

2. A pulse type transformer of claim 1 where the primary windings are electrically in series with the secondary windings.

3. A pulse type transformer of claim 1 where the primary windings are connected to a tap in the secondary windings having an electrical potential lying between the output voltages of the secondary windings.