IT-M3900B Series Feedback Source Load System

♦ Both bi-directional power supply and feed-back load, one machine for two purposes
One-touch switching between source and loaded devices at the panel.
Compact design, 1U@6kW, 2U@12kW
Voltage range: 10~1500V
Current range: -720A~1020A
Power range: ±12kW
Bidirectional energy flow between the object to be measured and the grid, seamless switching across quadrants
Simple master/slave parallel connection to expand power while maintaining performance*1
♦ Efficient and environmentally friendly energy return, effectively reducing electricity and cooling costs
CC/CV Priority Setting Function
Adjustable output impedance
Battery charge/discharge test
♦ Battery simulation to define the battery model
♦ Built-in LV123, LV148, DIN40839, ISO-16750-2, SAEJ1113-11, LV124 and ISO21848 standard voltage curves for automotive power grids *2
♦ Rise/fall slope can be set for voltage, current, power
Up to 10,000,000 points of dynamic curve simulation function
Load mode supports: CC/CV/CW/CR/CC+CV/CV+CR/CR+CC/CC+CV+CW+CR 8 operation modes.
Source mode supports CC/CV/CW and can simulate DC output internal resistance.
♦ Multiple protection functions: OVP / ±OCP / ±OPP / O TP / power down / islanding protection / grid state self-test
USB/CAN/LAN/Digital IO interface as standard, and optional GPIB/Analog & RS232 interface*1 1U model >16 units in parallel, 2U model >8 units in parallel Please contact ITECH for details.
*2 10V models do not have this feature

Application Areas

Industrial power modules (inverters, emergency power modules, bi-directional DC-DC, rectifiers)

♦New Energy Vehicles: BOBC, DC-DC Module, Automotive Electronic Devices

Small and medium power motors: drone motors, power tool motors, electric motorcycle motors

5G Communication and Data Center: Server Power Supply, UPS Inverter Unit, HVDC Power Supply

One-touch switching, bi-directional power & load return

Unlike ordinary bi-directional power supplies, the IT-M3900B series is a feed-back source-load system that combines two devices in a compact 1U structure. It can be used either as a feed-back bi-directional DC power supply or as a feed-back DC electronic load, truly integrating the power supply and load in a single machine.The IT-M3900B series is designed with function keys on the panel so that users can easily switch between the power supply and the load, which saves the space taken up by the equipment, the cost, and the time spent on connecting the instrument to be measured.

The IT-M3900B series can realize high-speed source and carrier current mode switching when used as a feed-back bi-directional DC power supply, thus providing fast and continuous seamless switching between output and absorption currents, effectively avoiding voltage or current overshoots, and is widely used in testing energy storage devices such as batteries, battery packages, and battery protection boards.

Efficient energy return

IT-M3900B has high efficiency, energy saving and environmentally friendly energy recovery function, which can return power to the grid without pollution, and return nearly 95%. All the return process is automatic and safe, IT-M3900B is equipped with an automatic grid detection system, which detects the phase voltage and frequency for grid synchronization in real time. It not only saves the cost of electricity, HVAC and refrigeration facilities and reduces noise, but also helps to reduce carbon emissions and protect the environment.

Multiple operating modes

The IT-M3900B is equipped with CC/CV/CW/CR basic operation modes in source load mode.

The IT-M3900B also features four composite operation modes, including CC+CR, CV+CR, CV+CC, and CC+CV+CW+CR under load function, which can be adapted to the testing needs of a wide range of occasions.

Battery simulation function

IT-M3900B series, due to its unique bi-directional design and variable output impedance, can quickly define the battery model by setting the voltage, capacity, internal resistance and SOC of the battery through the panel, in order to simulate the charging and discharging characteristics of the battery, and to assist in various other tests. At the same time, the user can also be equipped with ITECH's professional BSS2000 battery simulation software, which allows the user to set the commonly used parameters of the battery pack to quickly establish the battery characteristic curve, and also set the initial capacity of the battery, so as to validate the characteristics of the product in different states of the battery. At the same time, BSS2000 supports users to import the matlab battery model or the actual battery charge/discharge curves through the csv file, which is more realistic.