33results about How to "Sufficient creepage distance" patented technology

The present invention provides a semiconductor device which has a packaging structure of the improved packaging piece. The substrate packaging piece which is composed of a metal base for heat radiation, an insulation circuit board and a semiconductor chip is assembled with a peripheral resin casing. The L-shaped legs of the external terminals which are arranged on the surrounding wall of the peripheral resin casing are leaded to the inner side of the casing. A joint conducting wire is connected between the leg part and the conductor pattern of the insulation circuit board. In the semiconductor device with the structure, the peripheral resin casing is beforehand punched at the surrounding wall to form a plurality of terminal installing holes, and the necessary external terminals are installed in the terminal installing holes. Hereon, the terminal installing holes are designed and formed with a mode which can be corresponding with the arrangement of all device types and terminals with different standards. When the packaging piece is installed, the terminal installing holes which are selected according to the assigned standard are pressed with external terminals necessary for installation.

A stator includes a stator core having slots arranged in a circumferential direction thereof at a predetermined pitch and a stator coil comprised of phase windings. Each of the phase windings is configured with an electric conductor and an insulating coat covering the electric conductor. Each of the phase windings includes in-slot portions and turn portions connecting the in-slot portions. The turn portions of the phase windings include a plurality of types of turn portions having different circumferential lengths. For each of the phase windings, apex parts of the turn portions of the phase winding are arranged in pairs over the entire circumferential range of the stator coil. The apex parts of each of the pairs axially overlap each other. Each circumferentially-adjacent pair of the apex parts of the turn portions of all the phase windings are circumferentially offset from each other by a distance greater than the predetermined pitch.

The invention relates to the technical field of welding power sources, in particular to a three-phase electric overvoltage, undervoltage, and lack of phase alarm circuit based on peak voltage detection, which includes a No. 1 diode connected to any phase of the three-phase electric power; the overvoltage detection circuit , one of its input terminals is connected to the No. 1 diode, and the other is connected to any phase of the other two phases of the three-phase power supply. When the voltage exceeds the threshold value, the output terminal of the overvoltage detection circuit is turned on; fast charging and slow discharging logic comparison The circuit is connected to the output terminal of the overvoltage detection circuit, and includes a fast charge and slow discharge circuit and a logic comparison circuit No. 1. When the output terminal of the overvoltage detection circuit is turned on, the energy storage element of the fast charge and slow discharge circuit is charged to generate a Voltage higher than the reference voltage, when the output terminal of the overvoltage detection circuit is closed, the energy storage element of the fast charge and slow discharge circuit discharges, but maintains a voltage higher than the reference voltage; the output terminal of the fast charge and slow discharge circuit is connected to the comparator , and compared with the reference voltage, the comparator output is connected to the alarm device.

Provided is an electric motor in which an imbalance in electromagnetic force is inhibited even when an abnormality has occurred in an electric power system. The motor (1) is connectable to a plurality of electric power systems (D₁, D₂) and includes: a stator (8) including a plurality of excitation magnetic poles (12) disposed in a circumferential direction and coils (U1, V1, W1 (U2, V2, W2)) provided on the respective poles (12), the coils including, for each of the systems (D₁, D₂), a set of three or more phase coils, the coils carrying respective currents of three or more phases of the corresponding system (D₁, D₂); and a rotor (9) rotatable relative to the stator (8). The coils (U1, V1, W1, U2, V2, W2) of the stator (8) are arranged such that coils adjacent to each other in the circumferential direction are different in phase and associated with different systems.

An electrodeless discharge lamp apparatus is provided which is increased in heat dissipation, making it possible to adapt to an increase in output of the apparatus. The electrodeless discharge lamp apparatus comprises a bulb containing a discharge gas and a coupler accommodated in a cavity formed in the bulb for generating a high frequency electromagnetic field. The coupler has: an induction coil; a core inserted into the coil; a heat conductor for conducting heat generated from the coil and the core; and a bobbin made of resin which accommodates the core and the heat conductor therein, and which has the coil wound therearound. The bobbin is designed to be separated in a radial direction of the coil, so that it is possible to separately mold the respective parts of the bobbin. Thus, it is not necessary to form, in the bobbin, a draft angle which has been necessary in the prior art when molding a tubular-shaped bobbin, and it is possible to make the thickness of the bobbin thin and uniform, so that the proportion of the bobbin in the volume of the cavity can be reduced to increase the proportion of the heat conductor.

The invention provides an LED (Light Emitting Diode) bulb. The LED bulb comprises a radiator, a ceramic substrate in contact with the radiator, and an LED light source fixed on the ceramic substrate, wherein the radiator is provided with a boss, the boss is provided with a first connection surface formed in connection with the ceramic substrate, the ceramic substate is provided with a second connection surface formed in connection with the boss, and the area of the first connection surface is smaller than that of the second connection surface.

The invention discloses an electric arc short circuit prevention electromagnetic relay, which comprises a base, a magnetic circuit part and a contact part, and is characterized in that the base is provided with a first accommodating cavity, a plurality of partition plates are arranged in the first accommodating cavity and divide the first accommodating cavity into a plurality of partition cavities, and the side surface of the first accommodating cavity is provided with a first opening leading to each partition cavity; the contact part comprises a plurality of contact units, each contact unit comprises a movable spring component and a static spring component which are arranged in the corresponding separation cavity, and an armature of the magnetic circuit part is matched with each movable spring component through a pushing card; the device further comprises a first flash barrier, the first flash barrier seals all or part of the first opening, a plurality of first baffles are arranged on the inner side face of the first flash barrier, at least one first baffle is laterally inserted into each partition cavity, and the first baffles are adjacent to or abut against the partition plates of the partition cavities to form at least two arc barrier walls located between the adjacent partition cavities. According to the invention, inter-phase arc short circuit caused by arc generated by breaking of the movable spring component and the static spring component can be avoided.

The invention relates to the technical field of submarine communication, and provides a submarine optical cable splitter supporting an electric switching function. The splitter comprises a BU body and high-voltage switching units arranged at two ends of the BU body. The BU body comprises a first semi-cylindrical base and a second semi-cylindrical base; one side of the first semi-cylindrical base is rotatably connected with an optical module, and a single plate is attached to the bottom; the high-voltage switching unit comprises a relay, a mounting base, an elastic insulating pad and a protective cover; and the relay is arranged on the mounting base and is connected with the single plate in the BU body through a high-voltage line, and the elastic insulating pad is arranged between the relay and the protective cover. In the actual application process, the two high-voltage switching units are located at the two ends of the BU body respectively, on one hand, the enough high-voltage insulation creepage distance is guaranteed, on the other hand, the unit space in the BU body is saved, and the high-voltage switching function in the BU body is executed through relays in the high-voltage switching units.