The following operators can be used to better focus your queries.
( ) , AND, OR, NOT, W/#
? single char wildcard, not at start
* multi char wildcard, not at start
(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*
This guide provides a more detailed description of the syntax that is supported along with examples.
This search box also supports the look-up of an IP.com Digital Signature (also referred to as Fingerprint); enter the 72-, 48-, or 32-character code to retrieve details of the associated file or submission.
Concept Search - What can I type?
For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.
Concept search eliminates the need for complex Boolean syntax to inform retrieval. Our Semantic Gist engine uses advanced cognitive semantic analysis to extract the meaning of data. This reduces the chances of missing valuable information, that may result from traditional keyword searching.
Described is an improved winding of a toroidal common mode choke for AC line filters that permits increased current flow before saturation occurs.
English (United States)
This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately
83% of the total text.
Page 1 of 2
Improved Common Mode Choke
Described is an improved winding of a toroidal common mode choke for AC
line filters that permits increased current flow before saturation occurs.
Fig. 1 illustrates the usual common mode choke windings on a toroidal core.
Large differential current can flow without causing saturation because the flux
produced by each winding opposes the flux produced by the other winding.
Common mode noise current produces a net flux vector that opposes noise
For nonlinear loads, e.g., fusers and lamps in electrophotographic printers
and copiers, surge currents a magnitude greater than the steady state currents
can saturate even common mode chokes, permitting noise to pass through on
the AC power lines.
Not all the flux produced by the windings is contained within the toroidal core.
Some surrounds the windings outside the core. The outside flux causes leakage
inductance which can saturate the core.
As shown in Fig. 2, winding the coils in two parts reduces the distance
between opposing coils which, in turn, reduces leakage.
The number of parts the windings can be divided into can be increased. The
limit is an alternately wound coil. Before the limit is reached, however, the extra
insulation required produces diminishing returns.
The use of split winding can be extended to three-phase power. Fig. 3 shows
a three winding delta choke. The use of split windings in three-phase power has
an additional advantage of better separation of input fro...