6 \ VISHAY An Automotive Grade Above
D
ifferent types of electric/hybrid vehicle configurations are
being implemented in the automotive market today, which
increases the need for higher voltage/power levels to
meet the new system requirements.
For example, with all of the possible add-on parallel hybrid drive
configurations available today, a high-power 48V inverter is a
key part of the system implementation. In this 25kW
design, a 3-phase topology was
selected to optimize the
inverter and the machine
cost. Each phase features
a half-bridge switch
configuration along
the associated
gate drive
and
current sense amplifier circuitry in a very compact arrangement.
Only one of the phases (three poles per phase) is shown in
Figure 1 below.
The Vishay SQJQ184E MOSFETs (TR1/TR2 in Figure 2) used
in this design feature a bond wireless construction that allows
for very high pulsed drain currents and very low junction-case
thermal resistance in a compact 8mm x 8mm
package. The two MOSFETs are in
tight proximity to the DC bus
and the output phase
connection to minimize
parasitics.
The phase current
is measured
using a
Vishay
48V Inverter Power
Stage Solution
VISHAY INTERTECHNOLOGY
Figure 1: The
25kW/48V inverter design
with only one phase shown
(Source: Vishay)
