Lead has been determined to be a hazardous substance and the use of tin/lead solders are being restricted by government laws and regulations such as the European Union's RoHS Directive (Restriction of Hazardous Substances).

Powerful network equipment is finding its way into the domain of the Plain Old Telecom System (POTS) Central Office.

Initial and operating costs can generally be reduced and system reliability increased by incorporating a relatively simple DC UPS as an integral part of the data processing or communication equipment.

Improved components, technology and packaging / cooling concepts have reduced the size (watts/cubic-inch), weight (watts/pound) and initial cost (dollars / watt) of power support with improved reliability and reduced maintenance (i.e., lower new system goals of smaller, lighter and cheaper, along conversion products. When implemented properly, these can reduce operating cost.

Great opportunities for reduced design cycle time and improved performance are presented through the use of standardized cooling topologies that can be employed across various through the use of standardized cooling topologies that can be employed across various power power

TDI has developed several alternative equipment design and construction techniques for highly reliable power conversion, compatible with increasing environmental stress levels. The availability of this type of equipment opens up new alternatives for system cost and reliability optimization.

This paper compares single-phase and three-phase circuits from the component count, stress level and complexity standpoints. It demonstrates that when these items are taken into account, quite often the best choice is a combination of single-phase modules, configured to balance individual power line phases

HASS is especially productive in power conversion equipment, where component stress levels are typically more aggressive than found in other products. TDI has been instrumental in establishing HASS as a viable, high value-add production process.

Power Conversion Equipment reliability is crucial to the success of modern electronic systems. Best in class reliability assurance practices, based on a Total Quality Management philosophy and including HALT and HASS testing, provide power system reliability levels well above the traditional expectations of military and telecommunication industry standards.

The paper provides information on the characteristics of batteries, particularly Valve Regulated Lead Acid, environmental aspects and practical system configurations available for recharge control in battery backed DC power solutions.system architects designed to provide.

As the number of IFE being designed for commercial aircrafts increases, there is also an increasing need for power supplies (PSU) for these systems. Powering IFE is not a trivial task and requires special methods due to specific electrical and safety requirements.

As a useful reference tool, this guide will assist Navy managers, weapon system contractors and power supply vendors in identifying and understanding the alternatives and options available in selecting best power supply value.

The emergence of Electric Vehicles (EV's) and Plug-in Hybrid Electric Vehicles (PHEV's) has provided the possibility of utilizing energy stored in the vehicle's battery to power AC equipment from the vehicle (referred to as export AC power), or recycling power from the vehicle's battery back to the utility grid (referred to as Grid-tie power). With these opportunities come new considerations for personnel safety in the situation where there are unintentional faults from the power lines to ground. This paper analyzes various scenarios, pointing to viable solutions for personnel safety assurance circuits.

Historically, automotive electrical systems have been based on lead-acid battery technology. Until the 1950's, electrical systems were typically powered by 6V lead acid batteries, and then during the 1950's, they transitioned to 12V electrical systems. These systems are a nominal 12.6 volts DC with no current being drawn. Once the engine is running however, the voltage rises to approximately 14 volts. For the most part, the voltage is always at the 14 volt level whenever the vehicle is operational. The one area where this may not be maintained is with the engine idling and a heavy accessory load. In this situation, the load may exceed the alternator output and the battery may be called upon to supply the difference for a short period of time.