1) Pulse 1: When the pulse 1 surge waveform is used to simulate the parallel connection of inductive load of products, if the power is suddenly cut off, the voltage at both ends of the inductive load will be applied to the power supply terminal of the product in the opposite direction, which needs to be borne by the anti-reverse connection circuit at the power supply place of the product.
2) Pulse 2a: The surge waveform of pulse 2a is used to simulate the stray inductance on the power harness. As shown in the following figure, due to the disconnection of parallel load, the current in the stray inductance of the power harness changes, and then a positive voltage is superimposed on the power supply, which requires the installation of surge clamp devices at the power supply port of the product.
3) Pulse 2b: Using the surge waveform of pulse 2b, the product is simulated to be connected in parallel with a DC motor. When the power supply is disconnected, the DC motor is equivalent to a generator, and a positive voltage is generated and added to the power supply, which is a bit like energy recovery.
4) Pulse 3a: The surge waveform of pulse 3a is similar to that of pulse 1. When the power switch is a mechanical switch, the periodic surge impact generated by the arc after disconnection has both positive and negative amplitude and high speed.
5) Pulse 3b: The surge waveform of pulse 3b is similar to that of pulse 2a. When the power switch is a mechanical switch, the periodic surge impact caused by arc after disconnection is simulated at high speed.
6) Pulse 4: The surge waveform of pulse 4 simulates the voltage fluctuation at the product power supply due to the large surge current on the line when the starter is powered on. To put it bluntly, it is a low-voltage start-up problem.
7) Pulse 5a: The surge waveform of pulse 5a/5b, the so-called load rejection, is also the strongest surge waveform. The waveform of pulse 5a/5b simulates that when the alternator charges the battery, the current is very large. If the battery is accidentally disconnected, the output voltage of the alternator will rise sharply and be applied to the product power supply.
8) Pulse 5b:8) Pulse 5b: The surge waveform of pulse 5a is different in that the waveform of pulse 5b assumes that there is a clamping protection device (clamped to 35V) outside the product; However, the waveform pulse 5a does not, and all surge energy needs to be resisted by the product itself.