Auto-ranging, constant power dc power supply, higher current at lower voltage

PowerFlex DC Power Supplies from Aim-TTi - Thurlby Thandar Instruments

Most laboratory power supplies (PSUs) offer a fixed maximum voltage and maximum current capability. Thus, for example, a 35V/20A PSU can supply up to 700 watts, but its power capability falls in direct proportion to the output voltage so that when being used at 12V, for example, the maximum power has reduced to 240W.

The alternative approach is to design the PSU to have an auto-ranging or semi constant power characteristic so that the current capability rises as the voltage falls. To achieve this on a high performance laboratory PSU which operates over a very wide range of voltage and current including zero power, presents substantial technical challenges.

TTi has developed an autoranging technology called PowerFlex. Power supplies using PowerFlex regulation offer a near constant power output over a limited range. Thus, for example, the QPX1200 can provide 20A at 60V, rising to 50A at 20V. Below 20V the maximum current remains at 50A.

CPX Series PowerFlex power supplies

The CPX series are manually controlled dual output power supplies using PowerFlex regulation. Linear final regulation provides low output noise.

The CPX200 has a total power of 350 watts with each output providing from 35V/5A to 12V/10A.

The CPX400A has a total power of 840 watts with each output providing from 60V/7A to 20V/20A.

CPX series power supply models from TTi - More Details

QPX Series PowerFlex power supplies

The QPX series are digitally controlled power supplies using PowerFlex regulation.  Linear final regulation provides low output noise.

The QPX1200 has a total power of 1.2kW and provides from 60V/20A to 20V/50A.

QPX models include full remote control via RS-232, USB and LAN interfaces (with LXI support).

Setting resolution via these digital interfaces is 1mV for voltage and 1mA for current.

QPX series power supply models from TTi - More Details