LED display power supply

November 2010 Electrical Power & Protection

With the boom in green energy concerns, high efficiency power supplies have become a requirement in LED sign applications. In response, Mean Well has announced the availability of its HSP-250 series, 125-250 W AC/DC high efficiency enclosed type power supplies. Equipped with active power factor correction HSP-250 is available in three output voltages (2,5 V/3,6 V/5 V, 50 A), designed to drive RGB (red, green and blue) LED chips. This new system design concept can greatly increase the overall efficiency by using lower driving voltages (ex. 2,5 V, 3,6 V) for energy-saving purposes.

HSP-250’s innovative circuit design achieves efficiencies up to 87% even at these low output voltages. With built-in long life DC fan, it can be operated from -40 to +50°C ambient temperature under full load conditions, and up to +70°C with suitable derating. In order to cater for humid and dusty environments all units are equipped with anti-moisture and anti-dust conformal coating protection on the PCB. To solve voltage drop in the output wiring a built-in remote sense function is included for compensation. Other standard functions include cooling fan on/off control, short circuit, overload, over voltage and over temperature protection. Applications include LED electric display, LED TV walls and LED moving signs.

For more information contact Ettienne van der Westhuyzen, Current Automation, +27 (0)11 462 4253, ettienne@switches.co.za, www.rectifier.co.za

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