Digitally controlled AC-DC power supplies deliver 1450W

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Digitally controlled AC-DC power supplies deliver 1450WLambda is introducing a new range of digitally controlled modules, thereby extending its innovative NV-Power family of configurable AC-DC power supplies and increasing power output rating to 1450W peak for 10 seconds. The new modules enable Lambda to satisfy the increasing demand for 1U-high configurable power supplies above 1000W in automation, ATE, instrumentation, broadcast and medical markets, as well as other applications such as routers, servers and security networks.

The new modules incorporate many innovative design features including an integrated magnetics transformer that results in compact dimensions and increased efficiency. The digital control allows customisations based on the application's requirements (such as modified current limit or start-up characteristics). Additionally, input-to-output isolation meets the 4kV AC reinforced requirement for medical use.

NV-Power employs an eight-bit microcontroller to handle housekeeping routines, replacing the array of comparators, op-amps and other discrete components used in less integrated designs. This brings a 50 per cent reduction in parts count, which, in turn, provides 40 per cent more board space for power components. With the high peak power rating, designers can realise power densities of up to 19W/in3 from a 1U unit measuring 125 x 250mm.

EMC performance

The NV-350 range offers up to 600W continuous output power (750W peak for 10 seconds) from up to six configurable outputs. Lambda's Multi Resonant Topology (MRT) and other EMC-improving design features give curve B EMC performance with earth leakage current less than 300uA at 264V AC, 63Hz (meeting the requirement for IEC/EN/UL 60601-1).

For higher power requirements, the NV-700 range offers up to 1150W continuous output power (1450W peak for 10 seconds) from up to eight configurable outputs. Of particular note, the new, digitally controlled single-output 'C' module is three slots wide and available with 12V, 15V and 24V outputs, offering 450W continuous and 600W peak power for up to 10 seconds. Each module features 'output good' and 'inhibit' signals with the power supply offering low leakage current and EN 55011/55022 curve B EMC as standard.

Available with an extensive range of output modules and options, it is possible to achieve a wide range of output voltage and current combinations. Using the Lambda NV-Power Configurator, designers can create their own configuration online at This tool checks the configuration and offers the optimum supply with fully approved samples available on short lead times. All outputs are fully isolated and no minimum load is required.

Cooling options

Customers can choose from air cooling or low-noise, temperature-controlled fans. Additionally, the NV350 is available with reverse air cooling. Low-profile output connectors allow maximum airflow for optimised cooling efficiency.

Outputs covering the 3.2V to 64V range are available as well as 5V/2A and 12V/1A ATX-compatible standby outputs. NV-Power employs Multiple Efficiency Gain (MEG) technology to produce what is claimed to be a class-leading efficiency of up to 90 per cent, depending on the configuration.

All products in Lambda's NV-Power range are approved to IEC/EN/UL 60950-1 for general-purpose applications, as well as IEC/EN/UL 60601-1 for medical applications and IEC/EN 61010-1 for laboratory and process control applications. In addition, the units carry the CE mark and come with a three-year warranty.

For more information, visit the website at

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