For the electromagnetic disturbance caused by conduction and coupling in road vehicles and their vehicles, anti-interference experiments are carried out to improve the electromagnetic immunity of automotive electronic components or systems.
one. The specific power line conduction anti-interference test method is as follows:
1) Power line conduction transient immunity: directly inject the interference signal through the DC power line to check the immunity of the device to transient interference on the DC power supply.
two. Transient conducted immunity test equipment : pulse group generator, load simulator, micro pulse generator, voltage drop simulator, embedded module, coupling network, capacitive coupling clamp, automotive conduction anti-interference simulator, ISO Ford Chrysler LD Simulator, NISSAN LD Simulator, JASO LD Simulator, 60V/100A Voltage Drop Simulator
three. Power line transient immunity is divided into 8 kinds of pulses
1) Pulse 1: Turn off the inductive load (such as the motor of the power seat and the heating system of the window and the seat), simulate the transient phenomenon caused by the disconnection of the power supply and the inductive load. Experimental waveform:
2) Pulse 2a: Turn off the inductive load (such as the wiper motor) and simulate the transient phenomenon caused by sudden interruption of current in the device connected in parallel with the DUT due to the inductance of the wire harness. Experimental waveform:
3) Pulse 2b: DC motor (motor) When the ignition switch is turned off, the analog DC motor acts as a generator, and the transient phenomenon when the ignition switch is turned off. Experimental waveform:
4) Pulse 3a: When various switches, relays and fuses are turned on or off, the transient pulse caused by the arc (the drive unit of the electric door and window, the horn or the central locking system) simulates the transient phenomenon caused by the switching process. . The characteristics of these transient phenomena are affected by the distributed capacitance and distributed inductance of the wire harness. Experimental waveform:
5) Pulse 3b: various switches, relays and fuses, when turned on or off, due to the arc generated by the express pulse group (electric door and window drive unit, horn or central locking system), analog electric door and window drive unit, horn or The transient generated by the central locking of the door lock interferes with the positive pulse. Experimental waveform:
6) Pulse 4: Large load (such as air conditioner) or internal combustion engine starter motor plus voltage voltage change caused by the system's power system, simulating the reduction of the power supply voltage generated when the starter motor circuit of the internal combustion engine is energized, excluding the spike voltage at startup. Experimental waveform:
7) Pulse 5a: The voltage pulse on the other electronic equipment generated by the sudden disconnection of the battery during the charging of the battery by the transmitter, simulating that the alternator is generating charging while disconnecting the battery (depleted state) Current, while transients are generated when there are other loads on the generator circuit. Experimental waveform:
8) Pulse 5b: The voltage pulse on the other electronic equipment generated by the sudden disconnection of the battery during the charging of the battery by the transmitter, the analog sample with the clamp diode and the disconnection of the battery (debt state) At the same time, the alternator is generating charging current, and there are still other negatives on the generator circuit. Experimental waveform:
four. Signal line transient immunity is divided into 4 kinds of pulse waveforms
1) Pulse 3a and Pulse 3b: Pulse interference is coupled to the signal line through a capacitive coupling clip. Experimental waveform:
2) Pulse 2a and Pulse 2b: Pulse interference is coupled to the signal line by a current injection clamp. Experimental waveform:
Fives. The general test criteria are as follows :
1) ISO7637-2
2) GB/T21437-2
six. Test layout
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