Filter component

A filter component configured to be adapted to an electrical system having a first smoothing capacitor, a second smoothing capacitor, a first electric apparatus, and a second electric apparatus, each of the first electric apparatus and the second electric apparatus being connected in parallel to a battery and configured to be operated by an output power of the battery, the first smoothing capacitor configured to stabilize a power supply voltage supplied from the battery to the first electric apparatus, the second smoothing capacitor configured to stabilize the power supply voltage supplied from the battery to the second electric apparatus, the filter component comprising:

• a magnetic core including
• an outer core surrounding two empty spaces of the magnetic core and having a circulating magnetic circuit configured to circulate a magnetic flux, and
• a short-circuit core located between the two empty spaces and having a short-circuit magnetic circuit configured to allow a magnetic flux to flow through a location between two parts of the outer core;
• a first winding, a second winding, a third winding, and a fourth winding, which are wound around the magnetic core to generate the magnetic flux that flows through the circulating magnetic circuit and the magnetic flux that flows through the short-circuit magnetic circuit;
• and
• a resistive element, wherein
• the battery has two electrodes being a first electrode and a second electrode, respectively,
• the first electric apparatus has a power terminal being a first power terminal connected to the first electrode of the battery, and has another power terminal being a second power terminal connected to the second electrode of the battery,
• the second electric apparatus has a power terminal being a third power terminal connected to the first electrode of the battery, and has another power terminal being a fourth power terminal connected to the second electrode of the battery,
• the first winding and the second winding are connected in series between the first power terminal and the third power terminal,
• the third winding and the fourth winding are connected in series between the second power terminal and the fourth power terminal,
• the first winding and the third winding form in a common-mode inductor configured to suppress a common-mode noise current flowing between the first power terminal and the third power terminal as well as between the second power terminal and the fourth power terminal,
• the first winding, the second winding, the third winding, and the fourth winding form a differential-mode inductor configured to suppress a differential-mode noise current flowing between the first power terminal and the third power terminal as well as between the second power terminal and the fourth power terminal,
• the first winding, the second winding, the third winding, the fourth winding, the first smoothing capacitor, and the second smoothing capacitor form a filter circuit,
• the resistive element is connected in parallel across at least one of the first winding, the second winding, the third winding, or the fourth winding in the filter circuit, and is configured to suppress a resonance in the filter circuit,
• the first smoothing capacitor and the second smoothing capacitor are included in the filter component,
• a capacitance of the first smoothing capacitor is larger than a capacitance of the second smoothing capacitor, and
• a frequency of the resonance in the filter circuit is set based on the capacitance of the second smoothing capacitor and an inductance of the differential-mode inductor.

A filter component configured to be adapted to an electrical system having a first smoothing capacitor, a second smoothing capacitor, a first electric apparatus, and a second electric apparatus, each of the first electric apparatus and the second electric apparatus being connected in parallel to a battery and configured to be operated by an output power of the battery, the first smoothing capacitor configured to stabilize a power supply voltage supplied from the battery to the first electric apparatus, the second smoothing capacitor configured to stabilize the power supply voltage supplied from the battery to the second electric apparatus, the filter component comprising:

• a magnetic core including
• an outer core surrounding two empty spaces of the magnetic core and having a circulating magnetic circuit configured to circulate a magnetic flux, and
• a short-circuit core located between the two empty spaces and having a short-circuit magnetic circuit configured to enable a magnetic flux to flow through a location between two parts of the outer core;
• a first winding, a second winding, and a third winding, which are wound around the magnetic core to generate the magnetic flux that flows through the circulating magnetic circuit and the magnetic flux that flows through the short-circuit magnetic circuit;
• and
• a resistive element, wherein
• the battery has two electrodes being a first electrode and a second electrode, respectively,
• the first electric apparatus has a power terminal being a first power terminal connected to the first electrode of the battery, and has another power terminal being a second power terminal connected to the second electrode of the battery,
• the second electric apparatus has a power terminal being a third power terminal connected to the first electrode of the battery, and has another power terminal being a fourth power terminal connected to the second electrode of the battery,
• the first winding and the second winding are connected in series between the first power terminal and the third power terminal,
• the third winding is connected between the second power terminal and the fourth power terminal,
• the first winding and the third winding form a common-mode inductor configured to suppress a common-mode noise current flowing between the first power terminal and the third power terminal as well as between the second power terminal and the fourth power terminal,
• the first winding, the second winding, and the third winding form a differential-mode inductor configured to suppress a differential-mode noise current flowing between the first power terminal and the third power terminal as well as between the second power terminal and the fourth power terminal,
• the first winding, the second winding, the third winding, the first smoothing capacitor, and the second smoothing capacitor form a filter circuit,
• the resistive element is connected in parallel across at least one of the first winding, the second winding, or the third winding in the filter circuit, and is configured to suppress a resonance in the filter circuit,
• the first smoothing capacitor and the second smoothing capacitor are included in the filter component,
• a capacitance of the first smoothing capacitor is larger than a capacitance of the second smoothing capacitor, and
• a frequency of the resonance in the filter circuit is set based on the capacitance of the second smoothing capacitor and an inductance of the differential-mode inductor.