Roberts Warr Electronics News & Resources

To address the need for increased power, yet compact size, in today’s medical electronic systems, Power Sources Unlimited has announced the PMP120 Series if 120W AC/DC external power supplies. Measuring only 6.3″ x 3″ x 1.72, the PMP120 Series is offered with either Class I (with ground) or Class II (no ground) AC inputs, a growing need for portable medical devices. Units are approved to worldwide EN60601-1 standards for safety and EMC performance.
The Series has a power factor corrected, 90-264VAC input, and offers single output models ranging from 12VDC to 48VDC. Input to output isolation is 4000VAC and leakage current is specified at 150uA maximum at 240VAC.

A new method to enhance the power density
of Strong current switching power supply

As to the DC power supply, especially the strong current DC switching power supply and DC/DC convertor, its miniaturization is one of the key elements to apply it in broader fields.

As to all kinds of DC power supplies, no matter it is a commute power supply(50Hz),frequency conversion switch power supply or DC/DC convertor, it must face a unavoidable reality: under the same output voltage quality and working frequency, when the output current is strong, the volume of DC power supply is near direct ratio to the output current’s square. So,it is difficult to produce DC power supply with stronger output DC current, even it is impossible.

Easton, PA - January 11, 2007 - Output ranges from 0-6 to 0-100 Vdc, rated to 270 watts, are provided by Acopian’s Series Y programmable power supplies. Linear regulation limits output ripple to <0.25 mVrms, and line/load regulation in constant-voltage mode is ±0.005% or 2 mV, so these supplies are ideal for use in test equipment, analog systems and R&D.

They can be voltage programmed with an external potentiometer or switched resistance, or with a 0 to +10 Vdc control voltage. Input ranges are 105-125 or 210-250 Vac, 50-400 Hz. All models are UL recognized.

Operating temperature range is -20 to +71°C. Storage temperature range is -55 to +85°C. Output is floating; either positive or negative terminal may be grounded or floated up to 300 volts above ground. The temperature coefficient is typically 0.02%/°C.

Ashland, MA — Schaefer, Inc. has introduced the C/B 6400 Series of 22,000 Watt, 8U high, 19″ wide rack mount DC/DC and AC/DC converter modules. This compact and robust design provides a high density, space-saving solution for high power applications in industries such as railway controls and communications equipment (onboard and trackside), military applications, fuel cell applications, transportation, telecommunication systems, process control systems, and power stations.

The C/B 6400 Series is available in 2 standard DC input voltage ranges of either 320-640VDC or 450-800VDC, as well as 3-Phase AC input voltages of either 3 x 400VAC or 3 x 480VAC. Battery charging models are also available. Single outputs are available in 8 standard ranges from 45-800VDC. All outputs are adjustable and tightly regulated to 0.2% or better (load) and 0.1% (line).