Delta Electronics (Thailand) has been granted a patent for a passive, current dependent inductivity. The invention includes a magnetic core, windings, and at least one bank air gap. A saturation region made of magnetic material is placed between the bank air gap and the windings, creating two magnetic flux paths. The magnetic resistance of the first path is lower than the second path for winding currents below a certain saturation current, and vice versa for currents above the saturation current due to saturation effects in the saturation region. GlobalData’s report on Delta Electronics (Thailand) gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Delta Electronics (Thailand), HEV energy management was a key innovation area identified from patents. Delta Electronics (Thailand)'s grant share as of September 2023 was 64%. Grant share is based on the ratio of number of grants to total number of patents.
A patent granted for a passive, current dependent inductivity
A recently granted patent (Publication Number: US11763983B2) describes a passive, current dependent inductivity with unique features. The inductivity includes a magnetic core, windings, and at least one bank air gap. A saturation region made of magnetic material is positioned between the bank air gap and the windings. This arrangement allows the magnetic flux path to split into two paths: one passing through the saturation region and the other passing through the bank air gap. The magnetic resistance of the first path is lower than the second path for winding currents below a certain saturation current, while the magnetic resistance of the second path is lower than the first path for winding currents above the saturation current due to significant saturation effects occurring in the saturation region.
The patent claims also specify additional details about the design and construction of the current dependent inductivity. For example, the saturation region is made of a material with sharp saturation behavior, preferably ferrite. All parts of the magnetic core, except for the air gaps, are made of the same material, preferably ferrite as well. The bank air gap is completely surrounded by magnetic material and can have regions of different thickness, preferably filled with two different non-magnetic materials, such as air and a solid non-magnetic material.
The patent also describes the arrangement of windings, with all windings wound around the same leg of the magnetic core. The bank air gap extends perpendicular to the longitudinal axis of the windings and crosses the longitudinal axis above or below the windings. Additionally, the patent includes a configuration with a central air gap located on the leg of the magnetic core around which the windings are wound.
The patent further discloses a power converter that includes the described current dependent inductivity as a choke. It also outlines a method for constructing the inductivity, involving the selection of saturation current values, an intermediate inductance plateau value, and the dimensions and materials of the saturation region and magnetic core to achieve desired saturation behavior and inductance values.
Overall, this granted patent introduces a unique design for a passive, current dependent inductivity with specific features related to the arrangement of magnetic materials, air gaps, windings, and saturation regions. The patent provides detailed claims and methods for constructing such an inductivity, which could have potential applications in power converters and other electronic devices.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
