Week 4 Session 5

1) Types of power converter circuits are employed in electric and hybrid electric vehicle are as follows:

AC-DC-DC Converter:

In plug in EV/HEv, Battery can be charged externally through battery charger.

DC-DC Converter:

From the Battery to inverter, DC-DC converter are used to get the required DC input to the inverter. DC DC converter has variuos variety like buck, boost, flyback, forward converter. based upon the requirements, suitable converters will be used.

DC-AC Inverter:

Inverter converts DC input AC voltage as output for the operating Motors. In most cases, inverter may be 3 phase output..

For Example what type of converter will you use for Horn which requires DC and less than 10V:

Let us consider Battery pack is 48V

For horn we requires less than 10V for say 8V.

we need to use buck converter to step down the 48V to 8V.

The output voltage equation of buck converter is given by

Vout = Vin *D

where D Duty cycle

D = 8/48 = 0.16

Matlab simulation was performed for buck converteras shown:

Schematic:

Output waveform: