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Laboratory stand for the analysis of conducted disturbances in the car electrical circuits

Gonscz D., Urzędniczok H., Domański W.

Measurement Automation Monitoring

2017

Vol. 63, No. 8

271--274

The paper deals with technical aspects of the measurements of conducted disturbance levels in the electrical circuits of typical car vehicles. The work includes project, execution and a testing of new laboratory stand for analysis disturbances in the electrical circuits of car. The block diagram of the laboratory stand is shown in Fig. 1. Designed structure of the electrical installation is typical for the classic cars. The structure includes only the basic electrical circuits. The voltage level assumed in the installation is equal 12 VDC (car accumulator power supply). The commercial car loads (lighting, audio, ignition system, low power electric motors, etc.) are installed in the laboratory stand (Fig. 2). The selected test results of the laboratory stand (ignition system and power supply parameters in circuits) are presented in the chapter 3. The laboratory stand also allows to execute among others the immunity tests of selected components against electrostatic discharges.

Sieci sprzęgająco-odsprzęgające stosowane w badaniach kompatybilności elektromagnetycznej

Gonscz D.

Pomiary Automatyka Kontrola

2013

R. 59, nr 12

1248--1251

Publikacja obejmuje analizę wybranych struktur sprzęgająco-odsprzęgających (CDN), wykorzystywanych w pomiarach emisji i testach odporności. Scharakteryzowano niektóre procedury badań oraz aparaturę laboratoryjną. Wykonano analizy symulacyjne obwodów sprzęgających w CDN, istotnych dla struktur dedykowanych do pomiarów poziomów zaburzeń przewodzonych oraz obwodów odsprzęgających, pełniących ważną rolę, szczególnie w testach odporności. Analizy pozwoliły określić m.in. wybrane parametry metrologiczne sieci oraz poznać poprawność ich działania.

The paper deals with the analysis of coupling-decoupling networks (CDN) for measurements of the levels of conducted disturbances and for immunity tests of electrical equipments against conducted disturbances. The metrological analysis of an exemplary typical line impedance stabilization network (LISN) for measurements of disturbances in AC and DC power supply lines is presented in Section 2. The diagram of the discussed structure of LISN is shown in Fig. 1. The curve of measured output impedance of LISN is presented in Fig. 4, while the relative measurement error of electromagnetic disturbances for exemplary LISN is shown in Fig. 5. The circuits of coupling-decoupling networks used in the immunity tests of electrical devices against surge disturbances are characterized in Section 3. CDN structures used in BURST and SURGE tests in AC and DC power lines and signal lines are discussed. Investigations of CDN include computer simulations and laboratory measurements. The exemplary results of simulation analysis for the BURST test in a DC power supply line are given in Fig. 7. The measuring results for the SURGE test in a signal line are shown in Fig. 12. The conclusions and the most important practical hints are presented in Section 4. The problems with interpretation of immunity test results are discussed.