Hyundai Mobis Co., Ltd.

Hyun Woo Shim

Ji Hoon Park

Kang Min Kim

Deok Kwan Choi

Won Gon Kim

Min Heo

Tae Ho Bang

Du Ho Kim

A Ra Lee

Soo Min Jeon

Provided is an electro-magnetic compatibility (EMC) filter including a lower bobbin having a U-shaped cross-sectional shape, a lower core including a magnetic material having a U-shaped cross-sectional shape and disposed on the lower bobbin, a bus bar disposed on the lower core, an upper bobbin having a hollow inside, having a hexahedral shape with one side open, and configured to cover an upper portion of the lower bobbin, and an upper core including a magnetic material having a plate-like shape, disposed in an internal space of the upper bobbin, and disposed on the lower core (U core) to cover the bus bar with a gap maintained by the bus bar between the upper and lower cores when the lower bobbin and the upper bobbin are coupled to each other.

EMC filter for electromagnetic regulation of converter and manufacturing method thereof

An aspect of the present disclosure provides a bus bar as a winding in a core of a transformer includes multiple sub-bars arranged horizontally and connected in parallel so as to minimize an AC current in the transformer, and the sub-bars have different widths and thus resistances or impedances with respect to a current flowing through the sub-bars are the same. Another aspect of the present disclosure provides a method of designing a bus bar for resistance or impedance matching between multiple sub-bars included in the bus bar to share a current to minimize an AC current in the transformer. Another aspect of the present disclosure provides a transformer, for a DC-DC converter for use in a vehicle, which is manufactured by the method of designing a bus bar.

Bus bar for minimizing AC loss in transformer and method of designing the same

A low-voltage DC-DC converter (LDC) includes: an N-phase power circuit configured by connection of N DC-DC converters in parallel between a high-voltage (HV) battery and a low-voltage (LV) battery; and one output capacitor commonly connected to an output of each phase DC-DC converter. Each phase of the N-phase power circuit is controlled in an interleaving manner which delays a phase by 360°/N. Here, each N-phase power circuit is controlled by switching at a frequency of [(a frequency at which the parasitic resistance (equivalent series resistance (ESR)) of the output capacitor is minimized)/N]. The parasitic resistance of the output capacitor of the LDC can be minimized. Accordingly, a lifespan of a battery can be improved and efficiency of the DC-DC converter can be increased through the reduction of the equivalent series resistance (ESR) of the output capacitor.

Method and apparatus for minimizing parasitic resistance of output capacitor in LDC

The bidirectional insulating DC-DC converter shares high/low voltage terminals, a cooling passage, a housing, and a control board, and two independent step-down circuit () and step-up circuit () are formed in parallel to perform a bidirectional DC power conversion. A high voltage applied from a high voltage battery HV is stepped down through the step-down circuit () and output to a low voltage battery LV. On the other hand, a low voltage applied from the low voltage battery LV is stepped up through the step-up circuit () and output to the high voltage battery HV. The step-down circuit () is formed as an active clamp forward converter circuit, and the step-up circuit () is formed as an active clamp flyback converter circuit.

Bidirectional insulating DC-DC converter, control apparatus therefor, and operating method thereof

The present disclosure relates to a new bidirectional low voltage DC-DC converter (LDC), that is, a DC-DC converter capable of satisfying a safety level required for an eco-friendly vehicle and an autonomous vehicle and improving power conversion performance, and a method and an apparatus for controlling the same. The LDC proposed in the present disclosure is a new concept bidirectional LDC in which a plurality of converters having the same power circuit topology are subjected to a parallel interleaving operation so as to enable both a buck operation and a boost operation, satisfy a high safety level, and improve power conversion performance. To this end, a plurality of bidirectional active-clamp flyback converters (for example, two or more bidirectional active-clamp flyback converters) are connected in parallel and are interleaved and controlled by a controller (for example, a microcomputer).

Parallel interleaving operated bidirectional DC-DC converter and method and apparatus for controlling the same

A Low-voltage DC-DC Converter (LDC) includes a new bidirectional isolated LDC, in which two converters with different power circuit topologies operate in parallel in order to enable both buck mode and boost mode. The two applied converters are a phase-shift full-bridge converter with full-bridge synchronous rectification and an active-clamp forward converter. According to the present invention, it is possible to achieve the advantages of both a phase-shifted full-bridge converter with full-bridge synchronous rectification applied and an active clamping forward converter. Thus, it is possible to minimize output voltage and current ripples, thereby improving the quality of the LDC output power while minimizing electromagnetic waves generated while a product is operating.

Large capacity bidirectional isolated DC-DC converter and control method thereof

The present disclosure relates to a high electric power density bidirectional isolated low voltage DC-DC converter (LDC) assembly, in which a large-capacity bidirectional isolated LDC circuit is packaged in consideration of a flow of electric power so as to use components in common and minimize an internal dead space, and a cooling structure thereof. LDC assembly includes a power board subassembly () including the high voltage stage, a part of the buck circuit, and the boost circuit; a transformer subassembly () including a transformer of the buck circuit; an output power board subassembly () including a part of the buck circuit; and an EMC filter subassembly () including an EMC filter included in the low voltage stage.

Growing community of inventors

Suwon-si, South Korea

Hyun Woo Shim