摘要:
A variable filter element and a variable filter module suitable for decreasing the drive voltage are provided. The variable filter element includes a substrate, two ground lines and a signal line between the ground lines, where these lines are disposed to extend in parallel on the substrate. The filter element further includes movable capacitor electrodes which bridge between the ground lines and have portions facing the signal line, drive electrodes which are located between the signal line and the ground lines and generate electrostatic attraction with the movable capacitor electrodes, and a ground line, which is disposed in the substrate, has a portion facing the signal line, and is electrically connected with the ground. The variable capacitor electrodes and the ground line constitute ground interconnection portions, and the signal line and ground interconnection portion constitute a distributed constant transmission line.
摘要:
A MEMS device includes a substrate, a fixed electrode that is provided on the substrate and allows a signal to pass therethrough, a movable electrode that is provided above the substrate in a manner to face the fixed electrode and allows a signal to pass therethrough, a driving line that is provided inside the substrate and used to apply a driving voltage to displace the movable electrode, and a resistance that is provided in a first via hole formed inside the substrate and used to cutoff a signal. The fixed electrode or the movable electrode is connected to the driving line through the first resistance.
摘要:
There is provided a method for manufacturing an electronic device including: printing a conductive pattern on a first surface of a first green sheet having a multilayer structure, the conductive pattern being electrically connected to an internal interconnection formed in the first green sheet; superposing a second green sheet on the first surface of the first green sheet, the second green sheet having an opening located in an area corresponding to the conductive pattern; pressurizing the first green sheet and the second green sheet superposed thereon in directions in which the second green sheet is superposed on the first green sheet; burning the first green sheet and the second green sheet superimposed thereon to thus form a multilayer ceramic substrate; and mounting an electronic element on a second surface of the multilayer ceramic substrate opposite to the first surface, the electronic element being electrically connected to the internal interconnection.
摘要:
An electronic device includes a substrate, a first coil that has a spiral shape and is provided on the substrate, a second coil that has a spiral shape, is provided above the first coil, and is spaced from the first coil, a first connection portion that electrically couples the first coil and the second coil, a wire that is provided on the substrate and connects one of the first coil and the second coil to outside, and a second connection portion that is mechanically connected to an outer side face of outermost circumference of the second coil and is mechanically connected on the substrate where one of the wire and the first coil is not provided.
摘要:
The present invention discloses a control method for the system gain of a UPS, which includes the steps of: S1: detecting a PFC unit so as to determine whether to start an LLC, and if so, then going to step S2; otherwise, going to step S8; S2: starting the LLC; S3: detecting the mains supply so as to determine whether to switch from the mains supply to a battery, and if so, then going to step S4; otherwise, going to step S5; S4: performing a frequency-fixed adjustment on the LLC with an operating frequency larger than a resonating frequency by a preset magnitude while clearing an integral quantity within a first preset time T1; and performing a frequency-fixed adjustment on the LLC with an operating frequency equal to the resonating frequency while clearing the integral quantity between the first preset time T1 and a second preset time T2, and going to step S8; S5: determining whether the LLC-in-series resonant converter has an overload, and if so, then going to step S6; otherwise, going to step S7; S6: performing a frequency-fixed adjustment on the LLC-in-series resonant converter with the operating frequency equal to the resonating frequency while clearing the integral quantity; and going to the step S8; S7: performing a normal PI adjustment on the LLC-in-series resonant converter; and S8: Ending. The operation condition of the PFC is detected in real time, the LLC is started when the PFC becomes abnormal, and the LLC is adjusted in response to a load during operating so that the system gain is maintained in a monotonously step-down region of a ZVS region.