摘要:
A modular RJ45-type plug apparatus is provided for forming a connector interface with a connector jack in a high speed data transmission network. A housing comprises an insulative front portion and a conductive shield portion attachable to define an interior, within which is positioned a contact subassembly including a first PCB having cable mounting pads on one end and through holes for elongate plug contacts on the other end. The contacts are connected on one end to the first PCB and on a second end to a second PCB, with bridge portions therebetween collectively defining a jack contact interface. The second PCB comprises desired electrical characteristics which provide the apparatus with certain capacitance compensation properties, wherein the capacitance compensation is offset from a signal path defined between the jack-plug connector interface and the cable pairs.
摘要:
A power converter startup circuit establishes an operating voltage for control circuitry during startup and is then disabled to reduce no-load power dissipation. The startup circuit has a normally on characteristic to automatically provide startup charging current for a startup capacitor. The control circuitry begins operating as the startup capacitor voltage reaches an operating value, and it generates an inhibitory signal that disables the startup circuit to stop the startup charging current and reduce power dissipation. The normally on characteristic is achieved by an emitter switched current source employing a normally on device such as a depletion-mode J-FET. A resistor divider network provides both biasing for the startup current source and a point of monitoring the power supply input voltage during steady state operation.
摘要:
A power converter startup circuit establishes an operating voltage for control circuitry during startup and is then disabled to reduce no-load power dissipation. The startup circuit has a normally on characteristic to automatically provide startup charging current for a startup capacitor. The control circuitry begins operating as the startup capacitor voltage reaches an operating value, and it generates an inhibitory signal that disables the startup circuit to stop the startup charging current and reduce power dissipation. The normally on characteristic is achieved by an emitter switched current source employing a normally on device such as a depletion-mode J-FET. A resistor divider network provides both biasing for the startup current source and a point of monitoring the power supply input voltage during steady state operation.
摘要:
A power supply includes signaling circuitry coupled to output terminals for engaging in bidirectional communications with a load. A controller is capable of conducting the bidirectional communications and selecting among different operating modes for the power supply based on the communications. The modes may include a constant-current mode suitable for applications such as battery charging and power LED lamps, and a constant-voltage mode suitable for a variety of conventional uses such as powering electronic circuitry. The signaling circuitry may include a power switching transistor in series with the load, which is pulsed in a binary fashion to transmit communications to the load. A signal-forming resistor in parallel with the power switching transistor develops a signaling voltage monitored by the controller to receive communications from the load.
摘要:
A fiber optic cable assembly including at least one fiber optic cable including a plurality of optical fibers, a plurality of connectors pre-terminating at least some of the optical fibers, at least two interconnection modules having respective couplers, and wherein at least some of the connectors of the pre-terminated optical fibers of the at least one fiber optic cable are received and held in a coupler of each of the at least two interconnection modules. The cable is pulled through the ducts, conduit, etc. with the interconnection modules being separated from each other. The interconnection modules are small enough so that it is practical for them to be covered by a protective grip or boot and pulled through ducts, conduit or the like. The interconnection modules are preferably provided with attachment elements for attaching the interconnection modules to each other after the cable pull is completed to form an integrated modular array.
摘要:
An isolation transformer includes a transformer core. First and second through-bores extend through the transformer core from a first surface to a second surface. Each through-bore has an elongated profile with at least a portion of the elongated profile providing a respective flat winding surface. The flat winding surfaces are spaced apart by a central portion of the transformer core. The transformer is wound with a six-wire cable having a central non-conductive core. First, second, third, fourth, fifth and sixth conductive wires are positioned around and adjacent to the central non-conductive core in a substantially equally spaced angular relationship. The second conductive wire is positioned between the first conductive wire and the third conductive wire; and the fifth conductive wire is positioned between the fourth conductive wire and the sixth conductive wire. The conductive wires are twisted about the central non-conductive core at a selected twist density.
摘要:
A power inductor includes a core and winding. The winding has at least two portions, one made of pure copper and the other made of a low-TCR (temperature coefficient of resistance) alloy, wherein the alloy portion is used to form a current sensor. The two portions are joined to provide a unitary winding. The inductor can provide accurate current detection sensor while minimizing total resistance of the winding.
摘要:
A switched-mode power supply in a set of parallel-connected switched-mode power supplies is operated to (1) monitor both output current and operating temperature, and (2) auto-tune an output voltage using two-dimensional control that employs a two-dimensional function of the output current and the operating temperature. The two-dimensional function is a sharing function whose use in each of the supplies effects a coordinated sharing of both load current and operating temperature across the set of supplies. Temperature sharing includes monitoring and controlling distribution of operating temperatures across the set of supplies to reduce undesirable temperature imbalance that can cause excessive thermal stress and reduce reliability.
摘要:
A modular connector plug for high speed applications includes a wire guide filter at least partially situated in the conductor-receiving cavity of the housing of the plug. The wire guide filter includes an impedance containing portion comprising a longitudinally extending body having a plurality of longitudinally extending passageways and an internal cable guide portion comprising a longitudinally extending body defining a plurality of longitudinally extending passageways.
摘要:
A power converter includes a power transformer having a body housing two secondary windings, the body having first and second opposing and substantially parallel planar faces, each of the secondary windings having respective first coils and second coils having respective terminals. The terminals of the first coils extend through the first face of the transformer body, and the terminals of the second coils extend through the second face of the transformer body. The converter further includes two printed circuit boards (PCBs) each disposed at a corresponding face of the transformer body, each PCB carrying switches and capacitors of a respective rectifier circuit connected to the terminals of the coils of the respective secondary winding, each PCB including external connections for connecting the rectifier circuits in parallel to form an output of the power converter.