About input ranges

Our input voltage ranges

For AC/DC units, input ranges are selected with focus on the world’s most common national single-phase and three-phase electrical networks. Overwhelmingly, these are the networks of the American standard 120 VAC (maximum short-time deviation is 100-127 VAC) 60 Hz and the European one – 220-240 VAC (maximum short-term deviation 198-242 VAC) 50 Hz.

AEPS-GROUP produces units for a single-phase AC network with the names: 230 (182-242 VAC) or 115 (81-138 VAC) with a frequency of 50-60 Hz (up to 440 Hz per request). Transient 1s deviations are allowed at AC or DC network: for 230 range – 176-264 VAC or 256-342 VDC, for 115 range 81-150 VAC or 113-195 VDC. We call these input ranges “narrow”, since they have a small ratio of maximum to minimum voltage – 1,32 and 1,7 respectively.

Working with narrow networks, power supply units have significantly better power performance, i.e. high efficiency and high power density. Thermal modes of critical components are performed with a good reliability margin.

A “wide” input voltage range called 230W (100-242 VAC) with a frequency of 50-60 Hz (up to 440 Hz per request) is also used. Transient 1s deviations are allowed at AC or DC network: 100-264 VAC or 140-370 VDC. A wide range of 230W network is required when working with input mains of poor quality or if it is necessary to work with several alternative networks.

For three-phase voltage in the AEPS-GROUP units, input ranges called 400 (delta 323-440 VAC, accepted 390-620 VDC) and 220 (delta 187-253 VAC) with a frequency of 50-60 Hz (up to 400 Hz per request) are used.

For DC/DC converters there are also various input ranges options. AEPS-GROUP produces standard DC/DC units optimized for narrow input voltage ranges. It is assumed that the input voltage for the units is formed from the output voltage of a main centralized AC/DC power supply, which can have a battery bank connected to its output to serve as uninterruptible power supply. In this case, we optimize the energy characteristics of the DC/DC unit for voltage range of a discharging battery and taking into account the voltage rise during battery charging, calculated for a voltage of 12 VDC, 24 VDC, 48 VDC or 60 VDC.

As a result, there are the following narrow input voltage ranges: 12 (10.2-15 VDC) , 24 (20-30 VDC), 27 (20-40 VDC) and 48 (36-75 VDC). Similarly, we call these networks “narrow”, since they have a small ratio of maximum to minimum voltage – about 1,5-2. DC/DC converters optimized for narrows ranges of 12, 24, 27, 48 have the highest power and density characteristics – maximum output power, maximum efficiency, maximum power density with minimized case sizes. Such converters also allow operation at the highest case temperatures. This means that the narrow input ranges give a noticeable improvement in almost all important characteristics at lower costs.

A wide network can also be used for DC/DC units as well. Our wide voltage ranges are: 12W (10,2-30 VDC), 24W (20-60 VDC) and 27W (15-50 VDC). Transient 1s deviations can go up to 18 VDC for 12 range, up to 36 VDC for 12W range, up to 24 VDC and 80 VDC for ranges 24W, 27, 27W, 48. As a result of choosing wide input, there is slightly more costly product with slightly decreased power characteristics, requiring a bit more robust cooling systems (efficiency drops by 2–4% compared to units with narrow input ranges).

In power supply series TESHTESAV and TESZ in accordance with peculiarities of their applications there are used special input ranges. For TESH, DC ranges are: 48 (36-76 VDC), 115 (82-198 VDC), 150W (110-375 VDC) and 230 (175-342) VDC. For TESAV AC ranges are: 36 (25-53 VAC), 115 (80-140 VAC) and 230 (176-242 VAC) or alternative DC ranges (see datasheet). For TESZ  there are DC ranges 72Z (43-108 VDC), 96Z (57-144 VDC) and 110Z (66-165 VDC). 

Write to us and request – we will carefully consider the requirements for your particular input voltage range.

General designer of AEPS-GROUP Alexander Goncharov.