A power conversion apparatus included in a home appliance and including a converter configured to convert an AC power source into DC power and output the DC power to a DC terminal; a DC link capacitor connected to the DC terminal and configured to store DC power from the converter; an inverter configured to convert DC power from the DC link capacitor into AC power and output the converted AC power to a compressor; and a bandpass filter damper disposed between the input AC power source and the DC link capacitor and configured to allow a predetermined range of frequencies to pass through. Further, the bandpass filter damper is electrically connected to a ground of the input AC power source, thereby reducing the amount of leakage current flowing to the system ground.

A filter circuit includes an inductor provided between a signal path and a ground and including a first end electrically connected to the ground, a resonator provided between the signal path and the ground and including a third end electrically connected to the ground, and a capacitor provided on the signal path and electrically connected to a second end of the inductor and a fourth end of the resonator. The inductor is configured using an inductor element. The resonator is configured without using the inductor element.

Provided are a band-pass filter circuit and a multiplexer. The band-pass filter circuit includes an electromagnetic LC filter circuit and acoustic resonance units. At least one of the acoustic resonance units each includes at least one first acoustic resonator and at least one second acoustic resonator. The first acoustic resonator is connected in series between the band-pass filter circuit and the electromagnetic LC filter circuit. Each of the at least one second acoustic resonator is connected to a terminal of the at least one first acoustic resonator, where the first terminal of the band-pass filter circuit serves as an input terminal or output terminal of the band-pass filter circuit. One or more of the acoustic resonance units are connected on an input side of the electromagnetic LC filter circuit; and the remaining of the acoustic resonance units are connected on an output side of the electromagnetic LC filter circuit.

An electronic component includes a stack, a shield conductor integrated into the stack, at least one first columnar conductor, at least one second columnar conductor, an inductor including an inductor conductor layer connecting the at least one first columnar conductor and the at least one second columnar conductor, and at least one third columnar conductor connected to the ground. The shield conductor includes a first conductor part provided to a first side surface of the stack and a second conductor part provided to a second side surface of the stack. The at least one third columnar conductor is arranged between the inductor and the first conductor part.

A filter device includes a main body, a ground terminal, ground electrodes, resonators, and a via. The ground electrodes are at different positions in a normal direction of the main body. The resonators are between the ground electrodes and electromagnetically coupled to each other. Each of the resonators includes two capacitor electrodes connected by a via. When the main body is viewed in plan view, each of the capacitor electrodes overlaps a respective one of the ground electrodes. The resonators include first resonators respectively connected to an input terminal and an output terminal, and second resonators between the first resonators. The via is between the second resonators when the main body is viewed in plan view from the normal direction, and is connected to the ground electrodes.

A filter device includes a multilayer body in which multiple dielectric layers are stacked, a ground terminal, and a first LC parallel resonator, a second LC parallel resonator, and a third LC parallel resonator located in the multilayer body and magnetically coupled to each other. The first LC parallel resonator includes a first conductor, the second LC parallel resonator includes a second conductor, and the third LC parallel resonator includes a third conductor. The filter device further includes a connection conductor on a layer different from a layer on which the second conductor is located, a first via including one end connected to the first conductor and another end connected to the connection conductor, and a second via including one end connected to the third conductor and another end connected to the connection conductor. The connection conductor includes a first region that overlaps a portion of the second conductor in plan view of the multilayer body seen in a stacking direction.

In some examples, a variable inductor device includes a first planar loop comprising a first planar face and a material that supports electromagnetic coupling and a second planar loop comprising a second planar face and a material that supports electromagnetic coupling. The first planar loop is separable from the second planar loop to vary the inductance of the variable inductance device. In some examples, the first and second planar faces overlapping each other in a closed configuration of the device.

An electronic component includes first and second filter circuits. The first filter circuit has a first inductor on a first conductor layer. The second filter circuit has a second inductor on a second conductor layer and a third inductor on a third conductor layer. These inductors are aligned side by side in a direction orthogonal to the stacking direction of the conductor layers. The third conductor layer is at the same vertical position as parts of the first and second conductor layers. The first and second conductor layers each have more layers than the third conductor layer.

A filter device for multi-band wireless communication includes a first circuit characterized by a first pass-band from a first frequency to a second frequency; a second circuit characterized by a second pass-band from a frequency no smaller than the first frequency to a third frequency, the third frequency being no higher than the second frequency but higher than the first frequency; a third circuit characterized by a third pass-band from a fourth frequency to a frequency no greater than the second frequency, the fourth frequency being no smaller than the first frequency but smaller than the second frequency; and a switch configured to connect the first circuit either to the second circuit to reconfigure a first filter with the second pass-band or to the third circuit to reconfigure a second filter with the third pass-band.

A resonance circuit and a filtering device, which relate to the technical field of electronic devices. The resonance circuit includes: a connection port, wherein the connection port includes a first port and a second port; and a resonance unit, wherein the resonance unit includes at least one inductor element and at least one capacitor element, and the inductor element is connected to the capacitor element. The first port and the second port are respectively connected to the resonance unit, so as to form at least two branches which are connected in parallel, and at least one of the first port and the second port is not connected to any of the capacitor elements.