Other

Lucent Technologies Inc.

Raymond W Pilukaitis

Carl M Wildrick

Thang Danh Truong

Yi Teh Shih

William L Woods

Ning Sun

A control circuit for, and method of, allowing the power supply, having a controller and an output current limit, to be operated in parallel with other power supplies and a power supply incorporating the circuit or the method. In one embodiment, the circuit includes: (1) a voltage sense subcircuit, coupled to an output of the power supply, that produces a voltage control signal that is a function of an output voltage of the power supply and a voltage proportional to an output current of the power supply and (2) a current sense subcircuit, coupled to the power supply, that produces a current sense signal that is a function of the output current of the power supply, a combination of the voltage control signal and current control signal employable to modify an output of the controller and thereby regulate said power supply and allow said power supply to continuously operate in a current limit region.

Control circuit for paralleling power supplies and method of operation thereof

The present invention provides a method for soldering components to a printed wiring board. In one embodiment, the method comprises applying a substantially lead-free solder to the printed wiring board, placing an electronic component having lead-free terminals on the solder, and heating the printed wiring board in a substantially oxygen-free atmosphere to a temperature sufficient to reflow the solder. In an alternative embodiment, the method may further comprise applying a tin-based solder. In a particularly advantageous embodiment, the method includes applying a solder alloy of tin and a metal selected from the group consisting of: silver, antimony, copper, and gold.

Lead-free solder process for printed wiring boards

For use with a controller, couplable to a network of first and second comparators, that disables a power converter an actual output current thereof exceeds a threshold output current, an integrated protection circuit and method of operating the same. In one embodiment, the integrated protection circuit includes: (1) a sensor that senses an actual input voltage of the power converter and (2) an isolation circuit, coupled to the first comparator, that selectively decouples the first comparator from the controller, the second comparator causing the controller to disable the power converter when the actual input voltage falls below a threshold input voltage thereby allowing the protection circuit to provide both overcurrent and undervoltage protection.

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Garland, TX, United States of America

Raymond W Pilukaitis