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Due to the complicated output of the vehicle power supply system, various components such as high-current motors and solenoid valves often cause fluctuations in the output of the power supply voltage, and frequent voltage surges or drops occur frequently, which poses a challenge to the stable operation of the 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 enter restart, lock or unknown state, directly affecting security issues. How to simulate the voltage transients in the actual power supply system in the laboratory, so as to find out the hidden dangers of the reliability of the in-vehicle electronic products as early as possible? This depends on laboratory testing.
IT6500 series DC power supply built-in international test standard voltage curve
To facilitate testing of automotive electronics related products, and to provide uniform test standards, the International Organization for Standardization has provided a series of voltage transient waveform test templates to simulate voltage waveforms under various conditions. To predict the voltage transient waveform of the car in various operating environments, the engineer can test the test piece in the laboratory according to the voltage waveform defined by the template to determine whether the product can meet the requirements. For example, the German standard DIN40839 standard automotive power grid voltage curve and the international standard ISO-16750-2 pulse waveform are the two most common 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, so as to eliminate safety hazards for the car, ITECH has also been committed to research and testing of test instruments related to automotive electronics, and developed A series of high-power DC power supplies that can simulate the German DIN40839 standard automotive power grid voltage curve and the international standard ISO-16750-2 pulse waveform - IT6500 DC power supply series.
German DIN40839 standard automotive power grid voltage curve
DIN40839 is a standard automotive power grid voltage curve issued by the world's leading automotive electronics company in Germany for the automotive electronics industry. After the German standard was issued, manufacturers in the global automotive electronics industry followed suit. A standard automotive power grid voltage curve is applied to various related tests.
For example, in the test of car engine start-up, 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, and because the voltage is falling. At the same time, the speed is also very fast, and the real simulation of the voltage waveform when the car engine starts is a problem. When engineers are doing this test, if you use the Itech IT6500 series DC power supply, the built-in voltage curve of the German DIN40839 standard automotive power network 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 to achieve the experimental requirements.
The waveforms of the IT6500 series DC power supply simulation car engine start electrical test are as follows:
Idx IT6500 series DC power supply with built-in DIN40839 waveform
When an engineer uses this waveform for related tests, it can adjust its rising and falling slopes, and its voltage rise rate can be 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 set of templates for voltage transient waveform testing in the automotive electronics industry to simulate voltage waveforms in a variety of situations. The ISO-16750-2 document is one of them. How does it apply in a specific test? What is the role? In general, the waveforms contained in the ISO-16750-2 document can be used for the immunity test of automotive electrical and electronic equipment. The following are specific applications:
(1) The impact of instantaneous voltage drop on automotive electronic equipment
In a car circuit, when one of the circuits fails, the fuse is blown, which causes the voltage of the power supply device of the other circuit to drop at an instant, and if the electronic device in the circuit cannot withstand the voltage. If the impact of the fall is caused, the equipment will not be able to be used normally, which will affect the normal operation of the car and the vehicle electronics.
When engineers are conducting relevant tests, they can fully test the ISO-16750-2 international standard pulse waveform built into the IT6500 series DC power supply. This pulse waveform simulates the transient voltage drop caused by the melting of conventional fuse components in another circuit, and the electronic equipment on the vehicle is tested using this fully simulated condition. The following is a waveform diagram of the IT6500 series DC power supply for this test:
Idx IT6500 series DC power supply built-in ISO-16750-2 waveform (1)
It is not difficult to see in this waveform diagram that from a short period of 10s to 10.1s, the voltage instantaneous drop is instantaneously returned, and the actual situation is simulated, which can fully meet the test of the influence of instantaneous voltage drop on automotive electronic equipment.
(ii) Impact of different voltage dips on automotive electronics with reset function
The various devices in the car are intricate, and some of them are equipped with a reset function, such as a microcontroller commonly used in automotive electronics. Imagine if a car electronics equipped with one or more microcontrollers would not be able to operate once the microcontroller could not be reset properly, which would also pose a safety hazard. Therefore, the detection of the reset performance of the equipment has become an especially important experiment in many tests in the automotive electronics industry.
In this test, engineers can use the IT6500 series DC power supply to simulate different voltage dip curves to verify the reset performance of automotive electronics for different voltage dips. The waveforms are as follows:
Idx IT6500 series DC power supply built-in ISO-16750-2 waveform (2)
It can be seen here that during this test, the voltage waveform simulated by the IT6500 series DC power supply is a regular gradient curve, and the supply voltage drops at a rate of 5% for 5s, and then rises to the starting value, at least Maintain the function test for 10s; then the voltage drops again, so that the cycle function can ensure that the reset function of the device under test is fully verified.
(3) Characteristics of electronic equipment during and after start-up of the vehicle
When the car is started, its true voltage transient is not carried out in a completely linear waveform. In the ISO-16750-2 international standard pulse waveform, the AC voltage waveform with the superimposed frequency is used to make it more realistic. Simulating the DC voltage with ripple under DC power supply at the start of the vehicle, in this highly simulated case, the characteristics of the electronic equipment on the vehicle during and after the start of the vehicle are detected. The IT6500 series DC power supply can do this completely. The following figure shows the waveform of the IT6500 series DC power supply during this test:
Idx IT6500 series DC power supply built-in ISO-16750-2 waveform (3)
In the t8 time period in the figure, the voltage curve is a curve containing an AC voltage waveform with a superimposed frequency of 2 Hz. With this curve, it is possible to more realistically simulate a DC voltage with ripple on the DC power supply at the start of the car. The impact of the performance of electronic devices.
to sum up
The safety and comfort of the car are integrated, so the detection of the vehicle electronic equipment is very important. The Idx IT6500 series DC power supply has the German standard DIN40839 standard automotive power grid voltage curve and the international standard ISO-16750-2. Pulse waveform is the preferred power test instrument for the automotive electronics industry. In addition, the ITECH IT6500 series DC power supply has the widest voltage and current usage of high voltage and similar products, and is widely used in electronic equipment testing in automotive electronics and other electronics industries. For example, its built-in multiple standard communication interfaces and analog interfaces can meet a variety of communication and industrial control needs. It can be seen that the IT6500 series DC power supply can perform a variety of tests with ease, providing a very good tool for engineers' equipment selection. Good choice.
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