Abstract: A magnetic interface circuit for interfacing between the line side and the circuit side of a communication channel, such as an Ethernet port, includes a transformer having a primary winding connected to the line side of the channel and a secondary winding connected to the circuit side of the channel. The primary winding is fortified to provide differential mode electrical surge protection on the line side. The transformer design having parasitic L, C and R and, saturation during the surge event, acting to suppress the coupling of the electrical surge to the secondary winding. A voltage limiting device is connected in the circuit side of the channel to limit any voltage surges on the circuit side to a safe level. A pair of voltage limiting devices connected in series with the connection therebetween connected to ground may be used to also provide common mode surge protection.

Abstract: A multiport connector which includes a housing having at least two aligned compartments, each compartment being structured and arranged to receive respective plugs. A multilayer printed wiring board separates the two compartments, the printed wiring board having circuit patterns on opposite sides of opposed non-conductive layers and a metal shielding layer intermediate the non-conductive layers. A first plurality of conductive contact fingers is disposed in one of the compartments, the first plurality of fingers having first portions for making electrical contact with one of the plugs and second portions for making contact with the circuit pattern on one of the non-conductive layers of the multilayer printed wiring board.

Abstract: An RJ-45 jack having a groove to accommodate the width of an RJ-11 plug to allow the plug to rise upward and away from the outer contacts of the RJ-45 contacts upon inadvertent insertion of an RJ-11 plug into the RJ-45 jack.

Abstract: An RJ jack includes a housing having an interior chamber with a plurality of contacts which are deflectable upon insertion of a plug into the chamber. A plurality of projections is provided for limiting the extent of the deflection of selected contacts. In a preferred embodiment, the RJ jack is an RJ45 and the projections are fins located beneath the outermost contacts of the RJ45 jack.

Abstract: A magnetic interface circuit for a LAN, such as an Ethernet network, includes a transformer having a first winding connected to the line side of the LAN and a second winding connected to the circuit side of the LAN. Each of the first and second windings has two output ports and one of the windings has a center tap port A 3-wire common mode choke having a center winding and two outer windings, the center winding of a 3-wire common mode choke is connected to the center tap of the one winding and the outer windings of the 3-wire common mode choke are respectively connected to the output ports of the one winding.

Abstract: A converter includes a transformer having a primary winding, a secondary winding and an auxiliary winding, a first switching device for connecting an input voltage to the primary winding of the transformer, an output circuit connected to the secondary winding, a controller, and an integrated active clamp and primary bias circuit. The integrated active clamp and primary bias circuit includes the auxiliary winding and a second switch providing a bias voltage to the controller to alternately operate the first and second switches between conductive and non-conductive states. When the first switch is conductive the second switch is nonconducting and power is transferred from the primary winding to the output circuit via the secondary winding and from the auxiliary winding to the controller. When the first switch is nonconducting, the second switch is conducting and the voltage across the primary winding is clamped.

Abstract: An electronic device has three dimensional surface features molded into an encapsulant forming an electronic package. The electronic package has improved heat transfer compared to conventional electronic devices. The three dimensional features are designed to be moldable.

Abstract: The multiple output power adapter includes an AC input receptacle which plugs into an AC power socket. The AC input receptacle is connected to an input of a single output power converter which converts the input AC voltage into an output DC voltage of a specified level. Connected to the output terminal of the single output power converter is a DC-DC module converter which converts the output DC voltage into multiple output DC voltages. Additionally, the multiple output power adapter includes an output wire connected to the output terminal of the single output power adapter in parallel with the DC-DC module converter. The output wire and the output terminal of the DC-DC module converter are both then connected to an electrical component connector. With this structure, DC power can be supplied to an electronic device at a voltage level output by the single output power converter and/or at multiple voltage levels output by the DC-DC module converter.

Abstract: A magnetic interface circuit for providing ESD protection for a communication channel which includes a capacitor connected between ground and a point in the circuit electrically isolated from the input and output terminals of the circuit. The capacitor is arranged such that the capacitor acts as a virtual ground to ESD events to shunt current from an ESD event to ground. The location of the capacitor enables the use of a low voltage capacitor, as well as eliminates the need for stringent Hi-pot and spacing requirements.

Abstract: A magnetic interface circuit for a LAN, such as an Ethernet network, includes a transformer having a first winding connected to the line side of the LAN and a second winding connected to the circuit side of the LAN. Each of the first and second windings has two output ports and one of the windings has a center tap port A 3-wire common mode choke having a center winding and two outer windings, the center winding of a 3-wire common mode choke is connected to the center tap of the one winding and the outer windings of the 3-wire common mode choke are respectively connected to the output ports of the one winding.

Abstract: A DC/DC converter which includes a switched mode power supply, such as a switched mode buck regulator, has gate driven switching devices. A flyback converter is provided for providing a gate drive voltage to the gate driven switching devices. The flyback converter increases or decreases an input voltage to provide the gate drive voltage. A programmable under voltage lockout circuit is provided for turning ON of the flyback converter if the input voltage is lower than a predetermined value. A plurality, n, of buck regulators are connected in parallel and are controlled by a common controller which provides pulse width modulation signals to each power stage which are shifted by 360°/n from each other.

Abstract: An electronic device has three dimensional surface features molded into an encapsulant forming an electronic package. The electronic package has improved heat transfer compared to conventional electronic devices. The three dimensional features are designed to be moldable.

Abstract: A self-oscillation DC-DC converter circuit which includes a first transistor electrically connected to an input positive terminal, a second transistor electrically connected to the first transistor and operable to pass a portion of a base current of the first transistor, and a circuit to steady the output voltage electrically connected between the second transistor and an output positive terminal. The output negative terminal is connected directly to the input negative terminal. The self-oscillation DC-DC converter circuit does not use an auxiliary turn, thereby allowing the use of NPN transistors. Positive feedback is achieved by a voltage change Vce1 of the first transistor from a saturation state to a non-saturation state. In the non-saturation state, the second transistor is turned on, the first transistor is turned off and self-oscillation is achieved. With this construction, the self-oscillation DC-DC converter operates normally when the input voltage is lower than 5Vdc.

Abstract: An RJ connector with integrated magnetics which incorporates a structure to eliminate aperture leakage. In one embodiment, the RJ connector includes a housing having a top portion and a bottom portion and structured and arranged to receive a plug. A plurality of contact fingers are provided in the housing for making contact with corresponding contacts in the plug. Placed on the bottom portion of the housing is a bottom shield. The bottom shield comprises an insulating material and electrically isolated sections of conductive material embedded within the insulating material. The conductive material and the insulating material form an electrostatic/electromagnetic shield on the bottom of the connector. Each section of conductive material is connected to one of the signal pins of the connector.

Abstract: A self-driven synchronous rectification circuit which includes two power switches S1 and S2; a transformer Tr having a primary winding with Np number of turns, a secondary winding with Ns number of turns and an auxiliary winding with Na number of turns; two secondary synchronous rectifiers S3 and S4; two diodes D1 and D2; and two zener diodes ZD1 and ZD2. The number of auxiliary winding turns Na of the transformer Tr ensure that the synchronous rectifiers S3 and S4 are supplied with an adequate gate-drive voltage. When S3 conducts, the gate-drive voltage of S4 is clamped by D1. Likewise, when S4 conducts, the gate-drive voltage of S3 is clamped by D2. ZD1 and ZD2 operate to restrain the gate overvoltage of S3 and S4, respectively. With this design, the self-driven synchronous rectifier circuit operates normally at various output voltages, such as low output voltages of 3.3V or lower and/or high output voltages above 6V.

Abstract: A self-driven synchronous rectification circuit which includes two power switches S1 and S2; a transformer Tr having a primary winding Np, a secondary winding Ns and an auxiliary winding Na; two secondary synchronous rectifiers S3 and S4; two diodes D1 and D2; two switching transistors Q1 and Q2; and two zener diodes ZD1 and ZD2. The number of auxiliary winding turns Na of the transformer Tr ensure that the synchronous rectifiers S3 and S4 are supplied with an adequate gate-drive voltage. When S3 conducts, the gate-drive voltage of S4 is clamped by D1 and Q1. Likewise, when S4 conducts, the gate-drive voltage of S3 is clamped by D2 and Q2. ZD1 and ZD2 operate to restrain the gate over voltage of S3 and S4, respectively. When the gate drive voltage of S4 is clamped by D1 and Q1, Q2 disables D2 and when the gate drive voltage of S3 is clamped by D2 and Q2, Q1 disables D1.

Abstract: The power adapter includes an AC input receptacle which plugs into an AC power socket. The AC input receptacle is connected to an input of a voltage converting circuit which converts the input AC voltage into a DC voltage. The voltage converting circuit is contained within a first housing, and the AC input receptacle projects from the first housing such that it can be easily connected to a wall socket. A first cable is connected to the output of the voltage converting circuit and runs from the first housing to an input of a voltage regulating circuit which is contained within a second housing remote from the first housing. The voltage regulating circuit maintains and outputs the DC voltage within a desired range. The output from the voltage regulating circuit is connected to respective prongs of an electrical device connector via a second cable.

Abstract: A capless fuse which includes a hollow fuse body, a fuse element within the fuse body and terminal pins having helical springs which are inserted into respective ones of the ends of the fuse body and directly connected to the ends and to the fuse element.

Abstract: A clip for a surface mounted device, such as a fuse, which is attachable to a fuse by spring pressure and is attachable to a printed wiring board by soldering. The inner portions of the clip surfaces are non-solderable whereas the outer surfaces are covered with a solderable material. As a result, the inner surfaces of the clips and end caps of the fuse are not soldered during the soldering operation. This enables a fuse to be easily removed from the clips and replaced with a new fuse.

Abstract: A multiport connector which includes a housing having at least two aligned compartments, each compartment being structured and arranged to receive respective plugs. A multilayer printed wiring board separates the two compartments, the printed wiring board having circuit patterns on opposite sides of opposed non-conductive layers and a metal shielding layer intermediate the non-conductive layers. A first plurality of conductive contact fingers is disposed in one of the compartments, the first plurality of fingers having first portions for making electrical contact with one of the plugs and second portions for making contact with the circuit pattern on one of the non-conductive layers of the multilayer printed wiring board.