Abstract: An electronic device and a power system are provided. The electronic device includes a shelf casing and a filling component module. The shelf casing includes a plurality of side walls disposed around in sequence. The filling component module is disposed on the exterior of the shelf casing and adjacent to at least one of the plurality of side walls.

Abstract: A control method of a power factor correction circuit is provided. The first operating frequency of the power factor correction circuit is controlled to less than one-third of the minimum limitation frequency, the first operating frequency is controlled to less than 1?Nth of the first suppression frequency, and the second operating frequency of the power factor correction circuit is controlled to less than 1?Nth of the second suppression frequency. Consequently, at least portion of the operating frequency of the power factor correction circuit is not in the range measured by the machine so as to reduce the value of the noise of the electromagnetic interference.

Abstract: A hand-operated pulling device hook body retaining structure in which a magnetically attractive mount is fixed onto a pull strap near its hook body and, furthermore, the attachment of the magnetically attractive mount does not affect the pivoting capability of the hook body, and a powerful magnetic device is disposed at the inner lateral surface of the magnetically attractive mount that faces the hook body. Furthermore, the magnet permeates the inner side of the hook body and when the pull strap is hitched onto the cargo bed rail of a vehicle, the utilization of the magnet results in attraction between the hand-operated pulling device hook body retaining structure and the bed rail such that the dislodgement and falling off of the hook body does not readily occur, thereby also ensuring that the trussing of the pull strap is simply and efficiently conducted. As such, the present invention provides for exceptional industrial utility and practical value.