introduction
Due to the complex output of the automobile power supply system, various components such as high-current motors and solenoid valves often cause fluctuations in the power supply voltage output, and frequent occurrence of large voltage pulses or drops, which poses a challenge to the stable operation of electronic products in the vehicle. Especially for safety-related electronic products, such as airbag control circuits, ABS control circuits, etc., abnormal voltage fluctuations will cause the CPU or other chips of these devices to restart, lock up, or unknown, directly affecting safety issues. How to simulate the voltage transient phenomenon in the actual power supply system in the laboratory, so as to discover the hidden dangers of vehicle electronic products as soon as possible? This depends on laboratory tests.
IT6500 series DC power supply built-in international test standard voltage curve
In order to facilitate the testing of related products in the automotive electronics industry and provide unified test standards, the International Organization for Standardization provides a series of voltage transient waveform test templates to simulate voltage waveforms in various situations. To predict the voltage transient waveform of the car in various operating environments, engineers can test the test piece according to the voltage waveform defined by the template in the laboratory to determine whether their products can meet the requirements. For example, the German standard DIN40839 standard automotive power network voltage curve and the international standard ISO-16750-2 pulse waveform are currently the two most popular unified test standards in the automotive electronics industry. Therefore, in order to make the testing of in-vehicle electronics and the entire automotive electronics industry more standard and accurate, thereby eliminating potential safety hazards for automobiles, ITECH has also been committed to the research of test instruments for testing related products in the field of automotive electronics and has developed A high-power DC power supply series product that can simulate the German DIN40839 standard automotive power network voltage curve and the international standard ISO-16750-2 pulse waveform-IT6500 DC power supply series.
German DIN40839 standard automotive power network voltage curve
DIN40839 is a standard automotive power grid voltage curve issued by Germany, the world leader in automotive electronics, for testing in the automotive electronics industry. After Germany promulgated this standard, manufacturers in the global automotive electronics industry have followed suit. A standard automotive power network voltage curve is used in various related tests.
For example, in the test of starting a car engine, the voltage provided by the engine on the car drops instantaneously. In this case, if the battery on the car cannot withstand the impact of this voltage drop, it will stop working because the voltage is dropping. At the same time, the speed is also very fast, and the real simulation of the voltage waveform when the car engine starts becomes a problem. When engineers are doing tests in this area, if the ITECH IT6500 series DC power supply is used, the built-in German DIN40839 standard automotive power grid voltage curve can completely solve this problem. Engineers can also set this curve in the IT6500 DC power supply, and according to their actual needs, use the list mode provided by the IT6500 series DC power supply to edit and modify the waveform themselves to meet the experimental requirements.
The waveforms of the IT6500 series DC power supply simulation car engine when starting electrical test are as follows:
When engineers use this waveform for related tests, they can adjust its rising and falling slopes, and its voltage rising speed can reach very high, and the voltage can rise from 0V to 20V in 2ms. At the same time, in order to make testing more convenient, you can also make full use of the various analog interfaces of the IT6500 series DC power supply and the master-slave series-parallel mode.
ISO-16750-2 international standard pulse waveform
The International Organization for Standardization provides a series of templates suitable for testing voltage transient waveforms in the automotive electronics industry to simulate voltage waveforms in various situations. ISO-16750-2 is one of them. How does it apply in specific tests? What is the role? Generally speaking, the waveforms contained in the ISO-16750-2 document can be used for the immunity experiments of automotive electrical and electronic equipment. The following are specific applications:
(1) Impact of instantaneous voltage drop on automotive electronic equipment
In a car circuit, when one of the circuits fails, the fuse will blow, so the voltage of the power supply equipment of other circuits will momentarily drop, and if the electronic equipment in the circuit cannot withstand this voltage The impact of the fall will cause the equipment in it to be used properly, which will affect the normal operation of cars and in-vehicle electronics.
When engineers are performing related tests, they can use the ISO-16750-2 international standard pulse waveform built into the IT6500 series DC power supply for testing. This pulse waveform can simulate the transient voltage drop caused by the melting of the conventional fuse element in another circuit, and use this fully simulated situation to test the electronic equipment on the car. The following is the waveform of the IT6500 series DC power supply when this test is performed:
It is not difficult to see in this waveform chart that the voltage drops and resets instantly in a very short period of time from 10s to 10.1s. The actual simulation of the actual situation can fully meet the test of the impact of transient voltage drops on automotive electronic equipment.
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