380 Vdc to 48 Vdc High-Efficiency Powertrain Conversion

380 Vdc to 48 Vdc High-Efficiency Powertrain Conversion

Complete power-train conversion, from 380 Vdc to a standard 48 Vdc rail, can be achieved with a new Bus Conversion Module (BCM™) from V•I Chip Corporation, The VIB0002TFJ features a MHz-switching zero-voltage switching (ZVS™), zero-current switching (ZCS™), sine amplitude converter (SAC™) to achieve a high power density of 1,150 W/in3 and over 95% efficiency. In eco-array configurations, efficiency is over 90% from a 10% light-load, to full-load at multi-kW power levels. Established factorised power architecture components supply an easy and efficient step from the 48 Vdc rail to high-current, sub-1 V loads. The exceptional...

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Vicor Helps Power Solar Boat

Vicor Helps Power Solar Boat

Built in stainless steel, the stunning, 25-metre boat is manufactured by Kopf-Solarschiff for use as a sightseeing ferry with a capacity of up to 110 passengers and a range of up to 90 kilometres. A charge regulator, designed and manufactured by Uhlmann Solar with specialist support from Vicor is used to convert power from the solar panels into two batteries operating at different voltages: a 24 V battery is used to power the lighting and audio system, whilst a 300 V battery provides the drive power for the boat. Uhlmann Solar used four Vicor...

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Reduce Your Power System Volume by 75%

The combination of 840 W/in3 power density and 94.5% efficiency from a half-inch square, ‘half-chip’ V•I Chip package enables the VIB0101THJ to achieve a 75% reduction in overall power-system volume compared to equivalent power-rated modules. The first of the new 1/32nd bricks, the VIB0101THJ Bus Converter Module (BCM™) provides an easy, fast and flexible approach to achieving higher overall system efficiency combined with reduced board-space and cost. Rated at 120W, the VIB0101THJ operates from a 38 to 55 Vdc primary bus to provide an isolated 12 V nominal, unregulated secondary. This can be used...

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Understanding Forced-Air Cooling

Understanding Forced-Air Cooling

Forced air cooling can make a significant difference to thermal management, improving the heatsink-to-air thermal resistance by as much as an order of magnitude with the right combination of hardware. Making the right choices, however, means interpreting and matching the convection data for both the heatsink and the fan. The first step is to calculate the maximum heatsink-to-air thermal resistance for the system: next, the operating airflow through the heatsink is determined. Airflow from the fan, expressed in cubic feet per minute (CFM), is plotted against the curve for pressure drop, shown in inches...

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Input Source Impedance and its Effects on DC-DC Converters

Understanding input source impedance in DC-DC converter designs helps to ensure correct damping and stable operation. A detailed examination of the input impedance of a switch-mode DC-DC converter reveals why it is common practice to use a large electrolytic capacitor across the input to a DC-DC converter, and make input source impedance smaller than the input impedance to the converter. Read full article (PDF)

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Vicor Modules Power On-Board Railway CCTV

Vicor Modules Power On-Board Railway CCTV

Vicor VE-200 DC-DC converters are being used at the heart of the power block for a major new on-board CCTV system, installed by Portugal Rail, to increase passenger safety. The power modules are one of the most crucial components in the main ‘CCTV System for Transportation Systems and Passenger Transportation’ project. The design needed a nominal input of 72VDC, with outputs to 12VDC and 24VDC, both supplying 100W. Using the 12V VE-241-CW and 24V VE-243-CU DC-DC converters, and working with Vicor distributor Arrow Iberia, the design team followed Vicor guidelines to create an active...

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New 28V Micro DC-DC Converters for Commercial or MIL-COTS Power

The addition of eight new wide-input 28V quarter-brick Micro DC-DC converters from Vicor provide more choice for power designers in commercial, industrial or MIL-COTS applications. With efficiency up to 82%, these new converters operate from 28V nominal input with an input range of 9 to 36V. They offer nominal output voltages from 3.3 to 48VDC with a wide nominal output voltage trim range of 10% to 110%. The maximum power rating for the 12 to 48V output modules is 100W, whilst the 3.3V and 5.0V versions are rated for 50W maximum power. Four environmental...

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