Week 4 Session 5

Power converters:

1. DC to DC converter.

2. DC to AC coverter.

3. AC to DC converter.

4. AC to AC converter.

1. DC to DC converter in EV:

It converts unregulated DC input to regulated DC output.

• Delivering power to auxilliary loads operating at different loads such as, AC, Dimmer, Headlight, Horn, Wiper, Mirrors etc.
• Deliver power from battery to charger.
• Link between the HV and LV battery.
• LV battery link with the high voltage motor.
• Battery with ultra capacitors and battery with fuel cells as energy storage.

Examples:

• Buck converter
• Boost converter
• Buck-Boost Converter
• Flyback converter
• Half and full bridge converters

Converter modules:

• DCM - Discontinuous mode
• NBM - Non-bus isolated module.
• PRM - Power regulation module.

DC to AC Converter (Inverter):

It converts dc voltage to the ac voltage. It can control both the magnitude and frequency of output AC voltage.

• These are used in AC motors.
• Also used for single phase and three phase.

AC to DC converter(Rectifier):

It converts AC voltage to the DC voltage output.

• It is used for the on board charger.
• Also used for the power factor correction.