Week 4 Session 5

Q) Explain the various applications of Power converters in an Electric vehicle. For Example what type of converter will you use for Horn which requires DC and less than 10V. Likewise come up with different applications.

Ans:

Power converters play a crucial role in electric vehicles (EVs) as they help in managing and converting electrical energy efficiently. Here are some of the applications of power converters in an EV:

1. Charging Section: The AC-DC converter, also known as a rectifier, is used in the charging section of an EV. For instance, the Vienna rectifier is known for its excellent performance.
2. Powertrain Section: The powertrain section of an EV uses DC-DC converters and DC-AC inverters. A high-power DC-DC converter, such as the multidevice interleaved DC-DC boost converter, is an excellent candidate for EV applications. It is used to convert power from the high voltage (HV) bus to the 12V Low Voltage (LV) bus to charge the LV battery and power the onboard electric devices. This HV-LV DC-DC converter is also known as an auxiliary power module (APM).
3. Motor Driving: For driving an AC motor in EV, a DC-AC inverter is used. The third harmonic injected seven-level inverter can be considered a well-suited candidate for an electric vehicle’s powertrain. It converts DC power from the battery to AC power for the motor.
4. Onboard Loads: Unidirectional DC-DC converters cater to various onboard loads such as sensors, controls, entertainment, utility, and safety equipment. They are also used in DC motor drives and electric traction.
5. Regenerative Braking and Backup Power: Bidirectional DC-DC converters find applications where battery charging, regenerative braking, and backup power are required.

For the specific example of a horn that requires DC and less than 10V, a step-down (buck) converter would be suitable. This type of converter produces a lower average output voltage than the input DC voltage. It can efficiently reduce the voltage from the vehicle's main power supply (which is typically much higher than 10V) to a level suitable for the horn.