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MKT1820 DC Film
Capacitors
WSLP2726 Power Metal
Strip
®
Current Sense
Resistors
" ...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."
Figure 2: One pole is shown
in the simplified schematic of
power stage. (Source: Vishay)
WSLP2726 current shunt that features a very high power-
to-footprint ratio and very low resistance values (in this case
0.2mΩ) for high efficiency and very low inductance (again to
minimize parasitics).
The DC bus voltage is connected directly to the thick-copper
PCB in each of the phases. A localized DC link capacitor (C1 in
Figure 2) is provided in each phase and is connected near the
DC bus and the power MOSFETs to lower parasitics and reduce
transients (stress on the MOSFETs).
In this design, a Vishay MKT1820 47uF/63V film capacitor
was used, which features high-temperature operation up to
150°C and 4-pin terminations for vibration robustness. Another
MKT1820 is near the phase connections for filtering purposes.
The printed circuit board features a thick copper layer for the
high current connections and provides a low thermal resistance
path between the MOSFETs and the heat sink underneath.
As the move to 48V systems continues it is critical that the proper
components are selected in terms of thermal capacity, while also
paying close attention to the printed circuit board layout in terms
of stray inductances and capacitances that can cause unwanted
transients and additional power losses. ▼
