ISO 7637

MicroFound

EMC

Meng

ISO 7637 ISO 7637 ??

IS0 7637IS0 763712V12V24V24V

Meng

ISO 7637ISO 7637--1,1,--2,2,--33

ISO 7637ISO 7637--11 : :

ISO 7637ISO 7637--22 : 12V: 12V24V24V

ISO 7637ISO 7637--33 : 12V: 12V24V24V

ISO 7637ISO 7637--2 2 : : 12V12V24V24V

: : 232355 : :

24 0.4 12 0.2 UB

27 1 13.5 0.5 UA

24 V systemV

12 V systemV

Test Voltage

((Voltage transient emissions testVoltage transient emissions test))

1.1.

DUTRs

Ground plane

Oscilloscope

S60mm 15mm

200mm50mm

200mm50mm

+-

A

B

P

B

AN

ms-pulse

2.2.

DUTRs

Ground plane

Oscilloscope

100mm25mm

200mm50mm

200mm50mm

+- UA AN

P

B

A

B

s/ns-pulses

a.a.((50~60mm50~60mm..

b.b.1010((,,,,))

::

VVa a

-150V-300V-450V-600V-Negative

+50V+100V+150V+200V-Positive

Suggested limits for the classification of 24V EquipmentPulse amplitude (US)

-25V-50V-100V-150V-Negative

+25V+50V+75V+100V-Positive

Va

Suggested limits for the classification of 12V EquipmentPulse amplitude (US)

(Transient immunity test)(Transient immunity test)

Test Pulse type for Transient immunity Test Pulse type for Transient immunity (())

PulsePulseFast transient pulse Fast transient pulse ns / ns / s- Pulse ;

())

Slow transient pulse Slow transient pulse ms Pulse ; Load Dumpms Pulse ; Load Dump())

Fast transient pulse Fast transient pulse ns / ns / s- Pulsens pulse 3a , 3bs pulse 1 , 2a

Fast Transient (ns-pulse)

Pulse 3 a (negative) Generated by switching procedures and chattering relays in battery supply circuits. (distributed stray inductance and capacitance)

Pulse 3 b (positive) Typical DUT are electronic modules such as window drivers, horn or locking systems.

Fast Transient (s-pulse)

Pulse 1Is generated by switching off inductive loads, such as motors for seat moving or heating systems for windows or seats.offpulse

Pulse 2a Is the positive part of the induced voltage during switching off. Typical for wiper motor control.

onopenpulse 2a

Slow transient pulse Slow transient pulse ms ms Pulse / Load Dump (Voltage Drop)ms pulse - 5a , 5bVoltage Drop 4 , 2b

Slow Transient pulse (ms- Pulse)

Pulse 5aSimulation of transients occurring when a discharged battery is disconnected while the alternator is generating charging current. (other loads are still connected to the alternator circuit).

Pulse 5bThe generated load dump pulse is limited by a central load dump protection device.pulse

Slow Transient pulse (Voltage Drop)

Pulse 4 is generated by cranking or switching on heavy loads as air conditioners.()

Pulse 2 b After switching off the dc motor may work as a generator.

off

A/

B/

C/

D//

E//

ISO 7637ISO 7637--33 : 12V: 12V24V24V

Test Pulse 3a,3b Test Pulse 3a,3b

Setup(,)2m x 1m ()1mmground plane50mm100mm0.5m1m400 50mm(10020)mm9015

1.(50~100mm),)

2. 3.(100mm 20mm)4.(,,)5. 6. (12V24V) 7.8. 9. 10. 5011. 12.

planplan

505050505050

5050

1.1.2.502.503.3.4.504.505.505.50

0.5m0.5m

100~200pF100~200pF

4~40mm4~40mm

200V200V

(())(50 (50 5)

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