Smart Battery Switch Demonstrator (SBS)

Smart Battery Switch
Demonstrator (SBS)
September 2014
Smart Battery Switch Demonstrator
Power Distribution System Innovation
Pre-fuse box
Vbat
loads
KL30g1
SBS4
ECU
S
D
M
Control
IS
Pre-fuse box
KL30g2
SBS3
S
D
Control
IS
SBS2
high current load disconnect
Independent power networks
Delay / timing functionality
Peak current management
Partial powernet activation
Independent failure management
Quiescent current management
S
D
Control
IS
not protected
B4/B6
e.g. EPS,
engine fan M
SBS1
S
D
Control
generator/starter
cable protection
IS
Replacement of pyro-electrc switch
Resettable high current cable shutdown
Avoid corrosion / electro-migration
Jumpstart reverse battery blocking
Optional smart starter control function
Battery
IBS
High current load disconnect
Avoid corrosion / electro-migration
Failure / safety disconnect
Optional high-current electronic fuse
S
G
SBS: Smart Battery Switch
2013-10-30
Copyright © Infineon Technologies AG 2013. All rights reserved.
Page 2
Smart Battery Switch Demonstrator
Technical Realization
Electronic replacement of the
Pyro-electric SBK
Electronic Smart Battery Switch (SBS)
Same current handling
Similar size
Switch at any time
Pyro-electric
Battery Disconnect (SBK)
A joint high current system demonstrator project of
Infineon Technologies and Schweizer Electronic
Picture from Auto Kabel
2013-10-30
Copyright © Infineon Technologies AG 2013. All rights reserved.
Page 3
Smart Battery Switch Demonstrator
Technical Realization
A joint high current system demonstrator project of
Infineon Technologies and Schweizer Electronic
2013-10-30
Copyright © Infineon Technologies AG 2013. All rights reserved.
Page 4
Smart Battery Switch Demonstrator
TO-Leadless MOSFET & PCB Inlay Technology
chip
High current system approach, combining
High current MOSFET technology
High current PCB Inlay technology
bond wires
2mm Cu-Inlay
thermal-vias
2013-10-30
planar backside for optional cooling
Copyright © Infineon Technologies AG 2013. All rights reserved.
Page 5
Smart Battery Switch Demonstrator
Main Features

Description
Electronic high current battery disconnect, built up with the new ultra lowohmic TO-Leadless
MOSFETs in combination with an innovative Inlay PCB technology


Key features
400A static current


1800A starter current (thermal limited)

4500A short circuit shutdown

7200A peak current (40µs at 125°C)

0.082mΩ typ MOSFET resistor (25°C)

0.112mΩ typ Terminal-Terminal resistor

4.7K/W thermal resistor

36K temperature rise at 250A DC
2013-10-30

Main Applications

Replacement of pyro-electric battery
disconnect switches (SBK)

Resettable failure current shutdown
(electro-migration, corrosion)

Safety switch for high current loads (EPS,
engine fan, chassis control, …)

Quiescent current optimization (parking,
transport, seasonal use, …)

Partial power networks (electric vehicle
charging, living/working in the car, …)
Customer Benefits

Very compact design, ready to use

Lowest terminal-terminal resistor due to
newest technologies (MOSFET and PCB)

Minimum passive cooling via terminal/cable

Low cost approach
Copyright © Infineon Technologies AG 2013. All rights reserved.
Page 6
Smart Battery Switch Demonstrator
Measurement Results

Description
Measurement results at the Smart Battery Switch, sitting directly on the battery terminal,
50mm² cable at the output, free air convection, ambient temperature is 26°C and the
measurements are done after a thermal settling time of ~30min.
MOSFETs
Current
Voltage
drop
Terminal-toTerminal
Resistor
Power
loss
delta_T
static
Voltage
drop
Resistor
Power
loss
[K]
[mV]
[µOhm]
[W]
junctionambient
[A]
[mV)
[µOhm]
[W]
50
4.1
82
0.2
3.7
5.6
112
0.3
100
8.2
82
0.8
7.4
11.2
112
1.2
250
22.9
92
5.7
36
31.1
124
7.8
400
43.4
108
17.4
80
57.7
144
23.1
2013-10-30
Copyright © Infineon Technologies AG 2013. All rights reserved.
Page 7
Smart Battery Switch Demonstrator
Thermal Inspection
250A 10min
2013-10-30
400A 2.5min
Copyright © Infineon Technologies AG 2013. All rights reserved.
Page 8
TO-Leadless Package H_PSOF
Package Topology and Solder Joint Control
0,1 +0,05/-0
0,8 mm
0,55 mm
Trapezoid groove = guaranteed wetting
Exposed Cu =
no guaranteed wetting
2013-10-30
Sn plated but no guaranteed wetting due
to mold flashes
Sn plated = guaranteed wetting
Exposed Cu =
no guaranteed wetting
Copyright © Infineon Technologies AG 2013. All rights reserved.
Sn plated but no guaranteed wetting due
to mold flashes
Page 9
TOLL - Infineon’s latest PowerMOS Package
40V TOLL Product Portfolio
Product Name
max RDSon
[mOhm]
ID
[A]
LL/NL
RthJC
[K/W]
Status
IPLU300N04S4-R8
0.77
300
NL
0.35
Released
IPLU300N04S4-1R1
1.1
300
NL
0.8
QS-available
IPLU250N04S4-1R7
1.7
250
NL
0.5
QS-available
2013-10-30
Copyright © Infineon Technologies 2013. All rights reserved.
Page 10
Smart Battery Switch Demonstrator
PCB Copper Inlay Technology
High Current PCB Copper Inlay Technology
Multilayer PCB combined with thick Cu Inlays
Highest current capability and low resistance
Excellent thermal resistance and heat spreading
High mechanical stability
Automotive qualified
2mm Cu-Inlay
thermal-vias
2013-10-30
2mm Cu-Inlays
Copyright © Infineon Technologies AG 2013. All rights reserved.
Page 11