Power Supply Function
Inside most novel alternator, the amplitude of load dump is decreased by in-
creasing 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 (Test A) are given in follow.
• 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
: Peak voltage
Parameter
Type of system
Minimum test
requirements
12V 24V
U
S
a
(V)
79≤U
S
≤101 151≤U
S
≤202
10 pulses at 1 min intervals
Ri
a
(Ω)
0.5≤Ri≤4 1≤Ri≤8
t
d
(ms)
40≤t
d
≤400 100≤t
d
≤350
t
r
(ms)
– –
a
If 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 in-
ternal resistance.
The pulse shape and parameters for an alternator with centralized load dump
suppression (Test B) are given in follow.
Copyright © Itech Electronic Co., Ltd.
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