Disclosed is a high-voltage AC capacitor for reactive power compensation of 10 kV-35 kV power grid, and in particular to a high-voltage AC capacitor with a high-voltage switching switch provided therein, as well as a structure for prolonging the service life of a thin film metalized high-voltage capacitor and a control method for prolonging the service life of the thin film metalized high-voltage capacitor. The AC capacitor is formed by multiple intelligent switch capacitor units connected in series, and each capacitor unit is formed by a switch contact (K11-Kn1) and a capacitor (C1-Cn) connected in series. If there are N capacitor units, when each switch contact is disconnected, the endurable voltage of each switch contact, the endurable voltage between the switch contact and a coil and the voltage each capacitor withstands are 1/Nth of the total voltage; when the switch operates, all the contacts operate at the same instant.

A magnetic capacitor includes a first electrode layer formed by depositing a first conducting material including graphene, a second electrode layer formed by depositing a second conducting material including graphene, and an insulator layer located between the first electrode layer and the second electrode layer. The magnetic capacitor further includes a first magnetized layer that includes one or more first ferro-magnetic elements that are magnetized to apply a first magnetic field to the insulator layer, and a second magnetized layer that includes one or more second ferro-magnetic elements that are magnetized to apply a second magnetic field to the insulator layer. The insulator layer is located between the first magnetized layer and the second magnetized layer. The first magnetic field and the second magnetic field improve a first electrical property of the magnetic capacitor.

A method of making a capacitor with reduced variance comprises providing a bottom plate in a first metal layer, a first dielectric material over the bottom plate, and a middle plate in a second metal layer to form a first capacitor. The method also comprises measuring the capacitance of the first capacitor, and determining whether to couple none, one, or both of a second capacitor and a third capacitor in parallel with the first capacitor. The method may further comprise the steps of providing a second dielectric material over the middle plate, and providing a first top plate and a second top plate in a third metal layer to form the second capacitor, and a third capacitor. Electrical connections may be formed to couple one or both of the second capacitor and the third capacitor in parallel with the first capacitor based on the measured value of the first capacitor.

A magnetic capacitor includes a first electrode layer formed by depositing a first conducting material including graphene, a second electrode layer formed by depositing a second conducting material including graphene, and an insulator layer located between the first electrode layer and the second electrode layer. The magnetic capacitor further includes a first magnetized layer that includes one or more first ferro-magnetic elements that are magnetized to apply a first magnetic field to the insulator layer, and a second magnetized layer that includes one or more second ferro-magnetic elements that are magnetized to apply a second magnetic field to the insulator layer. The insulator layer is located between the first magnetized layer and the second magnetized layer. The first magnetic field and the second magnetic field improve a first electrical property of the magnetic capacitor.

Disclosed is a high-voltage AC capacitor for reactive power compensation of 10 kV-35 kV power grid, and in particular to a high-voltage AC capacitor with a high-voltage switching switch provided therein, as well as a structure for prolonging the service life of a thin film metalized high-voltage capacitor and a control method for prolonging the service life of the thin film metalized high-voltage capacitor. The AC capacitor is formed by multiple intelligent switch capacitor units connected in series, and each capacitor unit is formed by a switch contact (K11-Kn1) and a capacitor (C1-Cn) connected in series. If there are N capacitor units, when each switch contact is disconnected, the endurable voltage of each switch contact, the endurable voltage between the switch contact and a coil and the voltage each capacitor withstands are 1/Nth of the total voltage; when the switch operates, all the contacts operate at the same instant, the switch contacts are prevented from striking sparks or discharging arcs under the protection of the contact protection circuits, and the high-voltage switch is realized through multiple air contact switches connected in series.

Disclosed is a high-voltage AC capacitor for reactive power compensation of 10 kV-35 kV power grid, and in particular to a high-voltage AC capacitor with a high-voltage switching switch provided therein, as well as a structure for prolonging the service life of a thin film metalized high-voltage capacitor and a control method for prolonging the service life of the thin film metalized high-voltage capacitor. The AC capacitor is formed by multiple intelligent switch capacitor units connected in series, and each capacitor unit is formed by a switch contact (K11-Kn1) and a capacitor (C1-Cn) connected in series. If there are N capacitor units, when each switch contact is disconnected, the endurable voltage of each switch contact, the endurable voltage between the switch contact and a coil and the voltage each capacitor withstands are 1/Nth of the total voltage; when the switch operates, all the contacts operate at the same instant, the switch contacts are prevented from striking sparks or discharging arcs under the protection of the contact protection circuits, and the high-voltage switch is realized through multiple air contact switches connected in series.

A circuit design apparatus includes a storage that stores a first capacitance of a capacitor associated with one or more usage conditions, and a controller that controls an amount of energy of the capacitor under a specified usage condition of the one or more usage conditions. The controller calculates a second capacitance under the specified usage condition based on a first relationship between the specified usage condition and the first capacitance, and calculates the amount of energy of the capacitor based on the calculated second capacitance.

A method of making a capacitor with reduced variance comprises providing a bottom plate in a first metal layer, a first dielectric material over the bottom plate, and a middle plate in a second metal layer to form a first capacitor. The method also comprises measuring the capacitance of the first capacitor, and determining whether to couple none, one, or both of a second capacitor and a third capacitor in parallel with the first capacitor. The method may further comprise the steps of providing a second dielectric material over the middle plate, and providing a first top plate and a second top plate in a third metal layer to form the second capacitor, and a third capacitor. Electrical connections may be formed to couple one or both of the second capacitor and the third capacitor in parallel with the first capacitor based on the measured value of the first capacitor.

A multilayer capacitor includes a first grounding internal electrode including a first grounding electrode having a lead-out part led to one side surface of a stacked body, and a second grounding electrode having a lead-out part led to the other side surface; a second grounding internal electrode including a third grounding electrode which overlaps the first grounding electrode and has a lead-out part led to the other side surface, and a fourth grounding electrode which overlaps the second grounding electrode and has a lead-out part led to one side surface; and a signal internal electrode disposed between the first and second grounding internal electrodes, wherein the first and second grounding electrodes and the third and fourth grounding electrodes have, at their adjacent opposed sides, corners curved as seen in a plan view in the stacking direction, respectively, the corners being each located opposite to the corresponding lead-out part.

A method of making a capacitor with reduced variance comprises providing a bottom plate in a first metal layer, a first dielectric material over the bottom plate, and a middle plate in a second metal layer to form a first capacitor. The method also comprises measuring the capacitance of the first capacitor, and determining whether to couple none, one, or both of a second capacitor and a third capacitor in parallel with the first capacitor. The method may further comprise the steps of providing a second dielectric material over the middle plate, and providing a first top plate and a second top plate in a third metal layer to form the second capacitor, and a third capacitor. Electrical connections may be formed to couple one or both of the second capacitor and the third capacitor in parallel with the first capacitor based on the measured value of the first capacitor.