Abstract: A flat plug includes a base, a cover coved on the base, and two L-shaped electrically conductive blades. The base includes two rooms, two opposite holding faces formed in each of the two rooms, and two through holes located at the two rooms. The two blades each includes a horizontal portion and a vertical portion. The two horizontal portions each has a length larger than the distance between the two opposite holding faces, each being forcedly wedged respectively into the room and held tight by the two holding faces. The two horizontal portions each are inserted through the through hole. Thus, the two blades are securely positioned before the assembly of the base and the cover.

Abstract: A power supply status control circuit used in an electric outlet set having a main receptacle and multiple auxiliary receptacles, including a DC power circuit, a fuse, the fuse having a first end and a second end respectively connected to one end of the main receptacle of the electric outlet set and one end of AC power supply, an amplifier connected with its input end to the second end of the fuse, a comparator connected with its input end to the output end of the amplifier, and an electrically-controlled switch unit connected between the second end of the main receptacle and the second end of each auxiliary receptacle the electrically-controlled switch unit having a signal input end connected to the output end of the comparator to receive the output voltage of the comparator for on/off control. When the computer at the main receptacle is shut down, the auxiliary receptacles are electrically disconnected from the main receptacle to automatically turn off the peripheral apparatus.

Abstract: A power delivery control system includes a main receptacle and a plurality of secondary receptacles. Each receptacle is provided with a conductive member which is connected with a power source line via a respective one of a plurality of electrically-controlled switches. The power source line is connected to a power source. The electrically controlled switches are connected with a control unit for receiving an external electronic signal to bring about a control signal for controlling the electrically-controlled switches which in turn control the power supply between the power source line and the conductive members of the secondary receptacles.

Abstract: A flat plug structure including a base, a cover, a bent guide element, a semi-circular fastening ring, and two electrical conductive insert pins. The base and the cover are symmetrical circular plates, each having one side provided with an I-shaped groove for receiving the bent guide element, the opposite side being provided with a cut planar face. The base is provided with symmetrical recessed portions on left and right sides thereof. An inner end of each recessed portion is provided with a through hole for receiving the two electrical conductive insert pins, and a lower end thereof is provided with a deeper groove that extends to the I-shaped groove. A plurality of posts are provided in the recessed portion. The base or the cover is provided with a slightly projecting ring at an edge thereof, and high frequencies can be used to couple the base, the cover, the bent guide element, and the two electrical conductive insert pins together.