Introduction to Conducted Immunity for Extended Audio Range_Century Wisdom (Suzhou) Testing Technology Co., Ltd

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Introduction to Conducted Immunity for Extended Audio Range

Release time:

2023-05-10 15:20

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　　1, the foreword

With the progress and development of science and technology, there are more and more automotive electronic devices, the electromagnetic environment inside and outside the car is getting worse and worse, and the electromagnetic compatibility problem to be solved is more complicated. A series of EMC standards and regulations have been introduced internationally.

In December 2016, on the basis of GB/T 33014.10 project draft, translation and text collation were carried out in comparison with ISO 11452-10:2009, and the first draft of GB/T 33014.10 standard discussion was formed. In August 2017, the first seminar on the standard was organized by the China Automotive Technology Research Center. The second seminar of the standard was held in January 2018, which discussed and confirmed the key technical contents of Part 10. The draft for comments was formed in June 2018. GB/T 33014.10-2020 was released on December 14, 2020 and officially implemented on July 1, 2021.

GB/T 33014.10-2020 is formulated in accordance with ISO 11452-10:2009, and the technical content is consistent with ISO 11452-10:2009.

GB/T 33014.10(ISO11452-10) Conducted immunity method for extended audio range is a difficult point in automotive electronic immunity testing.

Scope of application: electrical/electronic components for vehicles of categories M, N, O and L. In particular, ① all power lines, output lines and low-frequency analog lines of the DUT; ② DUT with audio function or video display function.

Figure 1

　　2,GB/T 33014.10-2020 requirements for test equipment:

Fig. 2 Test layout block diagram

　　　　3, test method

During testing, an audio voltage source is differential-mode coupled to each of the specified terminals of the DUT through an isolation transformer. The DUT remains in normal working condition. Actual loads and excitation sources should be used as much as possible, and simulated loads and excitation sources should be used when conditions are not met.

The supply voltage of the system shall be measured at the DUT terminal.

The injection signal level shall be gradually increased to the level specified in the test plan. Alternatively, the test signal is maintained at a specified test level, and when the DUT is monitored to be affected, the test voltage is reduced to determine the sensitivity threshold.

The current in the harness shall also be monitored to ensure that the test current injected does not exceed 1A (root mean square value).

Fig. 3 Test Severity Level of recommend

　　4, the solution

Century Huize (Suzhou) Testing Technology Co., Ltd. is a professional service company integrating electromagnetic compatibility testing system and EMC third-party testing. It is located in the beautiful Taihu Lake and has three darkrooms, covering testing and services for civilian products, automotive electronics and other products. The solution provided by Century Huize (Suzhou) Testing Technology Co., Ltd. fully meets the requirements of ISO11452-10:2009,GB/T33014.10-2020.

Scheme I Split combination system

This system contains Autowave,AMP200N,CN200N300,VDS200Q, and current transformers. The AMP200N is controlled by the Autowave to produce a waveform that meets the requirements of the standard, which is amplified by the AMP200N's built-in amplifier and then applied to the line under test through the audio transformer CN200N300. The DUT is powered by the VDS200Q. See Fig. 4 and Fig. 5 for detailed arrangement.

Figure 4 Connection diagram of test system (alternative method)-Century Huize (Suzhou) Testing Technology Co., Ltd.

Fig. 5 connection diagram of test system (closed loop method)-century huize (Suzhou) testing technology co., ltd.

Looking at Figure 4 and Figure 5, it is obvious that the arrangement difference between the substitution method and the closed-loop method lies in the grounding of the EUT. In addition, the alternative method should be calibrated first. The calibration chart is shown in Figure 6.

Figure 6 Century Huize (Suzhou) Testing Technology Co., Ltd. Calibration Arrangement

Scheme 2 All-in-One CWS 500N3 Low Frequency Simulator, 10Hz-250kHz

CWS 500N3 is designed based on the concept of combination integration, which is simple, fast and reliable. Includes standard low-frequency signal generator, audio amplifier, 2:1 low-frequency transformer, frequency-selective current and voltage monitor, and load resistor.

The control software icd.control supports test procedures, controls external measuring devices and automatically generates test reports containing all test data.

Fig. 7 CWS 500N3 Low Frequency Simulator

Key features:

Ultra-small AC/DC power line ripple noise and magnetic field radiation simulator

Built-in low frequency signal generator

Built-in low frequency amplifier

Built-in 2:1 low frequency transformer

Built-in frequency selective voltage and current meter

Built-in load resistance

Automatic calibration

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