I01�High-voltage�Components
4.�Electrical�Machine�Electronics
65
The�temperature�of�the�DC/DC�converter�is�measured�using�a�temperature�sensor�and�monitored
by�the�EME�control�unit.�If�the�temperature�exceeds�the�permissible�range�despite�cooling�using�the
coolant,�the�EME�control�unit�reduces�the�power�of�the�DC/DC�converter�to�protect�the�components.
Power�electronics�for�activation�of�the�electrical�machine
The�power�electronics�for�the�activation�of�the�electrical�machine�are�mainly�made�up�of�the
bidirectional�DC/AC�converter.�It�is�a�pulse�converter�with�a�two-pin�DC�voltage�connection�and�a�3-
phase�AC�voltage�connection.�This�DC/AC�converter�can�work�as�an�inverter�and�conduct�electrical
energy�from�the�high-voltage�battery�to�the�electrical�machine�when�it�should�work�as�an�engine.
However,�it�can�also�work�as�a�rectifier�and�transfers�electrical�energy�from�the�electrical�machine�to
the�high-voltage�battery.�This�operating�mode�occurs�during�brake�energy�regeneration�in�which�the
electrical�machine�works�as�an�alternator�and�"generates"�electrical�energy.
Operating�modes�of�the�bidirectional�DC/AC�converter
