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Electrical transient conducted immunity

1. Introduction to the test

　　In the circuit design of automobiles/construction machinery, all circuits are powered by batteries and connected in parallel. The electronic control part mainly includes the controller PLC, switching power supply, relay group, sensors from the mechanical engineering part, the display on the console, the GPS in the cab, etc. These devices will inevitably generate electromagnetic disturbances when they are working. Disturbances may be propagated through conduction or radiation. While considering how to suppress these disturbances, these modules also need to consider whether they can withstand interference from other devices/modules and the environment , to ensure that it can work normally.

power cable:

　　Test pulse 1: Simulate the transient phenomenon generated when the power supply is disconnected from the inductive load. It is suitable for direct parallel connection with inductive load when various DUTs are used on vehicles

　　Test pulse 2a: Simulate the transient phenomenon caused by the sudden interruption of the current in the device connected in parallel with the DUT due to the inductance of the wiring harness

　　Test pulse 2b: Simulate the transient phenomenon when the DC motor acts as a generator and the ignition switch is turned off

　　Test pulses 3a and 3b: simulate the transient phenomena caused by the switching process. The characteristics of these transient phenomena are affected by the distributed capacitance and distributed inductance of the wiring harness

　　Test pulse 4: Simulate the reduction of the power supply voltage generated when the starter motor circuit of the internal combustion engine is energized, excluding the peak voltage when starting

　　Test pulses 5a and 5b: Simulate load dump transients. That is, to simulate the transient state generated when the alternator is generating charging current while there are other loads on the generator circuit while the battery is disconnected (depleted state)

Signal line:

　　Fast transient test pulses a and b (corresponding to test pulses 3a and 3b specified in ISO 7637-2): simulate the electrical transients generated by the switching process. The characteristics of electrical transients are affected by the distributed capacitance and inductance of the wiring harness

　　Low-speed transient test pulse (similar to test pulse 2a and 2b specified in ISO 7637-2): simulates the electrical transient that occurs when a large inductive load circuit is interrupted, such as a heat sink motor, air-conditioning compressor clutch, etc.

2. System connection diagram

3. Typical configuration

Electrical transient conduction immunity [according to GBT 21437.2/3 ISO 7637-2/3]
serial number	product	illustrate	brand
1	UCS 200N	Automotive transient pulse ultra-small conducted anti-jamming signal simulator, including EFT burst module, micropulse module, 60V/50A coupler including battery switch, DUT central output port, including MPG/SAEJ1455, MPG/NISSAN and VW 82066 Micropulse Test Module	EMTEST/ Switzerland
2	VDS 200Q50	Bipolar voltage drop simulator, -20V to +80V / 50A continuous, within 200ms, the surge current can reach 150A, and the frequency can reach 250kHz at 40Vp-p	EMTEST/ Switzerland
3	LD200N	Load Dump Test System	EMTEST/ Switzerland
4	PFM 200N100	Voltage drop simulator complies with LV 124:2009, LV 124:2013, E48-09 / LV 148, GMW3172: 2014:10, 9.2.18 RENAULT 36-00-808, NISSAN 28401NDS02 Voltage: ±100 V DC - Current: 100 mA - to 100 A, 400 A@200 ms, 1.350 A@1 ms	EMTEST/ Switzerland
5	AutoWave	AutoWave arbitrary waveform simulator, dual-channel output, can generate various waveforms based on parameters, point-to-point matrix or mathematical functions through the control software AutoControl, with standard management functions and report generation functions	EMTEST/ Switzerland
6	iso.control 3	ISO test software that can control 3 test equipment	EMTEST/ Switzerland
7	ACC	capacitive coupling clip	EMTEST/ Switzerland
8	CIP 9136A	43mm current injection clamp, 10kHz~400MHz, 100W, including calibration fixture PCJ 9201B, impedance matching network MN-CIP9136	TESEQ/ Germany

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