XP Launches Single-Output AC/DC Power Supplies

XP Power has introduced the SHP650 and MHP650 series of single-output high-power-density fan-cooled AC/DC power supplies. The MHP650 range meets the IEC60601-1 safety specification for medical equipment, while the SHP650 range compiles with the IEC60950 standard for IT and industrial equipment. Both series are highly efficient - typically 86 per cent - and have a high power density of 8.2W/in3.

Three mechanical mounting formats are available to provide design-in flexibility. Two fan-cooled formats provide the option of having the fan mounted internally on the top or externally on the end of the unit. The integral fan speed is load dependent to aid noise minimisation. By using the U channel format designers can supply their own airflow and only 5.5m/sec forced airflow is required.

A +12V DC, 6W fan supply is provided when using this format. All units operate from a universal 85-264V AC input range, with full power available from 90V AC. The operating temperature range is -20 to 70C with no derating below 50C. Each series offers six output voltage variants covering the nominal voltages of 12, 15, 24, 28, 36 or 48V DC and can be trimmed within +/-10 per cent of nominal. A 5V DC, 1W always-on output is also provided for standby purposes.

The SHP and MHP ranges feature a constant current overload characteristic, making them suitable for motor and other industrial type loads. Available control signals include AC OK and remote on/off. An active-current share capability is also provided to allow sharing of load across multiple units or, for configuration of redundant systems, remote sense is also provided. The SHP and MHP are of rugged construction with screw terminals and a three-year warranty. The units are available from Farnell or direct from XP Power.

Powerpax Launches Open-Frame Power Supplies

Powerpax has launched the PAXB60 series of open-frame power supplies with battery charging function. In addition to the main output, this range of battery back-up power supplies also has a charger facility that will fully charge a lead acid battery rated at 12V 15Ah or a 24V 7.5AH battery (depending on model selected) within 12 hours. The company said the unit is suitable for use in applications where it is crucial that uninterrupted use of equipment is maintained in the event of a power cut.

The batteries will automatically be recharged by the power supply and the unit will switch back to AC operation when the mains supply is restored. These battery back-up power supplies feature 'AC OK' and 'battery low' alarms, which can be driven by any external DC voltage from 4V up to 50V with a 30mA maximum load. If the main power source is interrupted, the PAXB60 switches to battery back-up mode and a TTL signal will be sent out to a monitoring unit to warn of impending equipment failure.

If the battery voltage goes down to 11V (for 12V battery bank) or 22V (for 24V battery bank), another TTL alarm signal will be sent out to warn of the 'battery low' situation. The battery back-up loop will be cut off when the battery voltage goes down to 10.5V or 21V to prevent batteries from over-discharging. The units also feature free air convection cooling, short-circuit, overload and over-voltage protection.

Battery polarity protection (by fuse) and battery low cut-off for the battery side in a small 4 x 2in design. The Powerpax battery back up power supplies operate at 84 per cent efficiency and carry UL, CUL, TUV, CE and CB safety approvals.