Function and Features
Inside most novel alternator, the amplitude of load dump is decreased by
increasing the limiter diode (clamping diode). The load dump may be caused by
cable corrosion, poor cable contact or disconnecting the battery intentionly
when the engine is running.
The pulse shape and parameters for an alternator without centralized load
dump suppression are given in follow.
Description:
• t：time
• U: test voltage
• t
d
：Duration of pulse
• t
r
：Rising Slope
• U
A
：Supply Voltage for generator in operation（see ISO 16750-1）
• U
S
：supply Voltage
Parameter
Type of system
Minimum test requirements
UN=12V UN=24V
USa(V)
79≤US≤101 151≤US≤202
10 pulses at 1 min intervals
Ria(Ω)
0.5≤Ri≤4 1≤Ri≤8
td(ms)
40≤td≤400 100≤td≤350
tr(ms)
aIf not otherwise agreed, use the upper voltage level with the upper value for
internal resistance or use the lower voltage level with the lower value for
internal resistance.
LOAD DUMP, SINGLE PULSE - WITH CENTRALIZED LOAD DUMP
SUPPRESSION
Copyright © Itech Electronic Co., Ltd.
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