Abstract: Power generated by a vibration power generator using an electret is efficiently supplied to a power supply load. A vibration power generator includes a first substrate and a second substrate configured to be moved relative to each other by external vibration while remaining opposite each other, a group of a plurality of electrets arranged in the relative movement direction on one surface side of the first substrate, and a group of a plurality of electrodes arranged in the relative movement direction on a surface side of the second substrate opposite to the group of electrets, the group of electrodes including first current collecting electrodes and second current collecting electrodes electrically connected to respective power supply loads to which power generated by the external vibration is supplied, and ground electrodes each provided between the first current collecting electrode and the second current collecting electrode and grounded.

Abstract: Power generated by a vibration power generator utilizing an electret is efficiently supplied to a power supply load. A vibration power generator includes a first substrate and a second substrate configured to be moved relative to each other by external vibration while remaining opposite each other, a group of a plurality of electrets arranged in the relative movement direction on one surface side of the first substrate, and a group of electrodes arranged in the relative movement direction on a surface side of the second substrate opposite to the group of electrets, and including a first current collecting electrode and a second current collecting electrode. A power supply load to which power generated by the external vibration is supplied and which has an impedance lower than an internal impedance of the vibration power generator is electrically connected to each of the first and second current collecting electrodes.

Abstract: A vibration power generator configured to generate power by displacement between an electret group having a plurality of electrets and an electrode group having a plurality of electrodes in a relative movement direction in response to an external vibration, includes a casing in which the electret group and the electrode group are disposed, a fixed member in which one of the electret group and the electrode group is disposed, the fixed member being fixed to a side of the casing, and a movable member in which the other of the electret group and the electrode group is disposed. The movable member is disposed in the casing such that the movable member is relatively movable in response to the external vibration while opposed to the fixed member.

Abstract: A voltage conversion circuit has a plurality of primary capacitors charged by a power supply, a secondary capacitor connected in parallel to the respective plurality of primary capacitors that is charged at a voltage supplied to a load circuit, a plurality of switching circuits provided in association with the respective plurality of primary capacitors that change over a connection state between the primary capacitors and the secondary capacitor, and a connection control circuit that successively connects the respective primary capacitors to the secondary capacitor through the corresponding switching circuits, the respective primary capacitors across which the charging voltages reach a predetermined connection voltage higher than a charging voltage across the secondary capacitor.

Abstract: A voltage converting circuit includes a plurality of first capacitors that are charged by a power source, a second capacitor, connected in parallel to the plurality of first capacitors, which is able to be charged to a voltage that is supplied to a load circuit, and a plurality of switching circuits, provided in such a way as to correspond to the plurality of first capacitors, each of which switches states of connection between its corresponding first capacitor and the second capacitor. The first capacitors are sequentially connected to the second capacitor through the corresponding switching circuits as charging voltages of the first capacitors reach a predetermined connection voltage that is higher than a charging voltage of the second capacitor so that the first capacitors are not short-circuited with each other.