Introduction to high-power DC power supplies with built-in automotive test waveforms!

New energy automotive electronic products are huge in scale, from cameras to laser radars, from airbags to complex assisted driving systems, all of which are components of automotive electronics. For new energy vehicles, bidirectional charging and discharging and three-electric systems are still developing rapidly. On the one hand, automotive electronics manufacturers are facing the challenges of increased voltage levels and increased power supply capacity. On the other hand, the diversity of automotive industry test standards and the complexity of programming functions have added difficulty to this work. The automotive power network voltage curve test function of ITECH IT3900C series power supply can solve these problems.

The IT3900C series bidirectional programmable DC power supply has built-in standard waveforms for customers to easily call and directly perform tests. The standards involved in the built-in waveforms include DIN40839, ISO167502, ISO21848, SAEJ1113-11, LV123, LV124, LV148, ISO21780, etc. These waveforms allow automotive electronics engineers to more easily select suitable standard waveforms for testing, avoiding the trouble of complex data settings.

For example, the LV124 test mainly targets the reliability and safety of automotive electronic equipment, including EMS systems, electrical integrated components such as steering wheels, and electronic components such as air conditioners and airbags. These devices must meet various requirements such as durability, anti-interference, operational reliability, and environmental adaptability to ensure that they can operate normally in any situation and provide maximum protection for drivers and passengers.

Application Cases

Test background:

Take the E-02 transient overvoltage waveform as an example: This waveform can simulate the transient overvoltage in the base wiring harness caused by cutting off the electrical appliances and in the case of a short-term gas shock (Tip-In), so as to achieve the experimental purpose of testing the life of the electrical appliances. The waveform demonstration is as follows:

Test plan:

IT-M3902C-32-80 supports two operation modes: panel operation and host computer software to execute LV124's E-02.

1) When operating the local panel, just select and trigger the function in the menu. Use an oscilloscope to capture the actual waveform of the IT-M3900C bidirectional power supply and you can see that the waveform is very standard.

2) Use IT9000-PV3900 free host computer software to select the type of waveform that needs to be edited and tested in the configuration menu, select "On" and click the trigger button to output the waveform.

The upper computer software also has a waveform diagram:

(Note: E02 is a transient overvoltage waveform, and the output time is less than 1ms)

ISO 21780:2020 "Road Vehicles - 48V Supply Voltage - Electrical Requirements and Tests", released by the International Organization for Standardization in August 2020, specifies the requirements and tests for electrical and electronic components installed in road vehicles with a nominal voltage of 48V DC electrical systems, including general requirements, voltage ranges, and slow voltage transients and fluctuations for 48V DC electrical systems. The IT-M3900C series bidirectional DC power supply also has this regulation built in to assist in the research and development and advancement of 48V DC electrical systems. The optional models with curve functions for automotive networks cover voltage levels of 32V-1500V. In addition to using regulatory waveforms, users can also meet various low-voltage and high-voltage test requirements and have ultra-wide power supply test capabilities. The multifunctional, efficient, and highly stable product design gives customers the confidence to face various complex tests and quickly improve product competitiveness.