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ITECH IT8900 Series High Performance High Power DC Electronic Load

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IT8900 series of high performance high power dc electronic loads provide three voltage ranges 150V/600V/1200V. The power expands to 600kW by master-slave paralleling, and maintains stand-alone functions. 50kHz high speed measurement, six working modes, transient over-power loading capability, CV loop speed adjustment, Measurement function, 25kHz dynamic test and other multiple accurate testing functions make IT8900 series well-suited for types of high power applications. Built-in LAN/USB/RS232/GPIB interfaces are designed for many fields such as power supply, power battery, DC charging station, generators, military and aerospace etc.

Model Options

Model Voltage Current Power Size

IT8912-600-480

600V

480A

12kW

15U

IT8912-1200-240

1200V

240A

12kW

15U

IT8915-150-960

150V

960A

15kW

15U

IT8918-600-720

600V

720A

18kW

24U

IT8918-1200-360

1200V

360A

18kW

24U

IT8922-150-1440

150V

1440A

22.5kW

24U

IT8924-600-960

600V

960A

24kW

24U

IT8924-1200-480

1200V

480A

24kW

24U

IT8930-150-1920

150V

1920A

30kW

24U

IT8930-600-1200

600V

1200A

30kW

37U

IT8930-1200-600

1200V

600A

30kW

37U

IT8936-600-1440

600V

1440A

36kW

37U

IT8936-1200-720

1200V

720A

36kW

37U

IT8937-150-2400

150V

2400A

37.5kW

37U

IT8945-150-2500

150V

2500A

45kW

37U

IT8948-600-1920

600V

1920A

48KW

24U*2

IT8948-1200-960

1200V

960

48KW

24U*2

IT8960-150-2500

150V

2500A

60KW

24U*2

IT8960-600-2400

600V

2400A

60KW

37U*2

IT8960-1200-1200

1200V

1200A

60KW

37U*2

IT8972-600-2500

600V

2500A

72KW

37U*2

IT8972-1200-1440

1200V

1440A

72KW

37U*2

IT8990-150-2500

150V

2500A

90KW

37U*2

IT89108-600-2500

600V

2500A

108KW

37U*3

IT89108-1200-2160

1200V

2160A

108KW

37U*3

Features

  • High resolution for voltage / current: 1mV/1mA
  • Supports master-slave paralleling, maintains stand-alone functions
  • Provides six working modes: CC/CV/CR/CW/CC+CV/CR-LED
  • Adjustable CV loop speed, well-suited for multiple power supplies
  • Transient over-power loading capability
  • Ultrafast loop response, available for 18Bits high speed test with up to 50kHz voltage/current measuring speed
  • Unique Measure function, designed for rise/fall time measurement of voltage or current
  • Overall modular design, convenient for maintenance and service
  • Full protection: OVP/OCP/OPP/overheat protection/anti-reverse protection/current limit protection/power limit protection
  • Built-in LAN/USB/RS232/GPIB interfaces
  • Supports VISA/USBTMC/SCPI
  • 25kHz dynamic mode
  • Short circuit function
  • Battery test function
  • OCP/OPP test function
  • Remote sense
  • I-monitor
  • External analog control
  • Up to 100 groups memories, with power off memory function
  • Control via software by computer

Applications

  • Electric motors
  • Server power suppl
  • Communication power supply
  • Military & Aerospace
  • Car Charger
  • Battery pack
  • Energy storage system
  • Charging
    station

CV+CC Compound Operation Modes  

To conquer the demanding testing requirements existing for a long time in various applications, ITECH developed an innovative industry-leading CV & CC priority concept. The IT6500 is available for high-speed test applications with-out overshoot. Users can choose the desired output mode. Voltage high-speed mode or current no overshoot mode by choosing the loop response speed and loop operation mode. It is suitable for high-power integrated circuit test, charging / discharging test, military, solar array simulation and the transient simulation / characteristic of automotive electronics.

4 Basic Load Operation Modes

IT8900 series provide constant voltage, constant current, constant resistance and constant power modes, to meet the test needs from customers.

Master-Slave Paralleling, Maintains Stand-Alone Functions

IT8900 series support master-slave paralleling for same models, to expand power up to 600kW. The user operates on master panel and the slave unit will be distributed automatically, simple to use. Master-slave paralleling can achieve stand-alone functions, traditional paralleling is not workable under CV mode. However IT8900 series can parallel under CC/CV modes innovatively. IT8900 series are mainly applicable in the fields of DC charging station, power battery, high voltage UPS and military high power DC motor tests.

Transient Over Power Loading Capability

Transient over power loading capability, it will make load to take over power loading capability in short time, users no need to select types as maximum power value, it can extremely save cost. This function can be widely used the DUT transient peak power supply ability. Such as DC motor start-up simulation, start transient power will be several times of common working power, or else, it can simulate power supply’s transient over load features, application in discharging for high power battery in transient time.

CR-LED (CC+CR) Operation Mode

IT8900 series CR-LED (CC+CR) mode can supply LED power drive testing and be applied in led current simulation, to simulate the ripple in real testing, CR-LED can improve speed and stability for control loop, it can solve the voltage and current jitter problem in LED driver testing, furthermore, IT8900 can increase frequency width, it can help users to achieve PWM dimmer testing.

Measure Function

IT8900 series provide measure function, mainly used for measuring the rising and falling time of voltage or current within a specified range.

Measurable period of time as follows:


(1) The rising time period from A point to B point
(2) The falling time period from D point to E point
(3) The falling time period from C point to E point (Positive pulse width time)
(4) The rising time period from D point to F point (Negative pulse width time)

Remarks: from above graph, A and B are arbitrary points of the rising stage, C is one point on the green stage, D and E are arbitrary points of the falling stage.

CV Loop Speed Is Adjustable

We believe that many engineers will meet the below similar situation, load loop speed is too fast or too slow to match some slow or high speed power supply features, result is testing value will vibrated. This problem can be well solved with IT8900 series, when appear mismatch situation, users can adjust interior CV loop speed with “High-rate” or “Low-rate” to achieve the best matching point.

This function can conveniently help customers to solve the different matching problems. Even it can save the cost and improve testing efficiency, after a simply setting up, one electronic load will meet the multi complicated DUT testing, CV high-low rate testing: power supply: IT6015 setting up: 60V/1A Blue is voltage waveform, green is current waveform

Applications

  • Power module rising and falling time measurement

The Rising time test and Falling time test are one of the necessary power supply test item. The users can directly read the voltage rising/falling time from on the IT8900 display screen by sending instructions, easy operation and high testing accuracy, which is comparable with oscilloscope.

Application

  • Fuse blown time

Combine the CC function and Measure function together, the users can measure the fuse blown time, time measurement accuracy can reach 10μs.

The automotive industry requires to test the fuse blown time in the different magnification conditions. For example, 500A fuse with 6 times magnification, the fusing current will reach 3000A. IT8900 can meet the testing requirements.

OCP, OPP Tests

OCP and OPP are mainly applied in over-current and over-power point tests of the lithium-battery protection board and power modules. For power supplies, OCP and OPP are designed to guarantee the user’s safety and to reduce damage rate. IT8900 loads can automatically judge the test result according to the set specifications, so the users can save much time in verification of design and production system.

Measurement Speed Up To 50kHz

IT8900 with high performance characteristics, 1mv/1mA high resolution, 50kHz measurement speed, which increase the testing speed and accuracy. Such as solar battery testing. Because solar battery’s IV feature will change with the different environment temperature, illumination radiation, luminous intensity etc. Thus, the solar battery IV feature must be multiple-points tested within short period of time, which request the loads to be able to high speed measure. IT8900 can measure 250 points of the solar battery IV curve within 5ms, using together with IT9380 solar battery test software, the users can set the measurement voltage, and the software will acquire the data within the specified range automatically.

Dynamic Mode Reach 25k

Dynamic mode operation enable the electronic load to switch between the two set parameters according to set regulations, making use of the electronic load dynamic mode to test the power supplies, which can reflect the stability when power supply loading current in step changes. Meanwhile, IT8900 series digital loop circuit design and CV loop speed adjustment increase the loop response speed. For different power supply characteristics, IT8900 series has high and low bandwidth for choice, which is suitable for different power supply test.

Battery Discharge Test

Through operation panel or software, IT8900 can set 3 battery stop conditions: voltage, capacity and time. Whenever met any condition, it will automatically stop test. During the test, users can observe battery’s voltage, time and already-discharged-capacity. The discharging curves can be checked through the software. The discharge test can reflect battery’s reliability and residual service life.

Automatic Test

IT8900 has a very strong automatic test function. The automatic test function is useful for simulating various tests and allows the user to edit up to 10 groups of testing files. It helps engineers to test out all kinds of data of the tested power supply at different loading status. Automatic test function can edit multiple product tests, such as CC, no-load, short-circuit, CV, so it can finish all test by one time. It makes tests convenient and fast, and to ensure high efficiency and testing accuracy.

External Analog Test

Analog control interface is to meet industrial control requirements, when there’s no need to use PC controlling, user can control through PLC. IT8900 loads can control load voltage or current through the analog interface at the rear panel, to analog 0-full scale input range by connecting to 0-10V adjustable voltages, so as to adjust load’s input voltage and current values.

Special aviation field battery discharging test

Power Off Memory

IT8900 can save 100 groups of frequently testing data in nonvolatile memory device, which makes it convenient for users to recall the data. IT8900 provides power off memory to guarantee that the long-term testing result data can be saved well when there’s abnormal power-off or computer crash. Once the system is back to normal, the program can continue staring from the fault point. This function can avoid repeated tests, thus to improve testing efficiency. When it remains under power-off status, IT8900 will automatically stop working, and to make test safe and reliable.

Now, Here’s the Technical Bit…Such As Rise/Fall Slope etc.

Related Technical Articles & Application Notes

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