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What determines the power of the converter?

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orcuns91

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Hi everybody,
For my thesis, I am working on a boost converter circuit for use in electric vehicles. I want to simulate the converter according to the values of the Toyota Prius model vehicle as a case study. However, I am not sure how much the converter should have power rating. What would you suggest based on the following values?

Battery: 207.2 V Lithium-ion (Li-ion)
Power output : 71 hp (53 kW)
Voltage : 600V maximum
Moter Type : Permanent magnet AC synchronous motor

Other than that, I don't have any information.
 

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Jeez, you have not framed your question very well, do you mean you want to go from 200V to 600V? the power of the converter is determined by the max load on the 600V o/p, so 10A abs max = 6kW and so on ...
 

orcuns91 said:
Hi everybody,
For my thesis, I am working on a boost converter circuit for use in electric vehicles. I want to simulate the converter according to the values of the Toyota Prius model vehicle as a case study. However, I am not sure how much the converter should have power rating. What would you suggest based on the following values?

Battery: 207.2 V Lithium-ion (Li-ion)
Power output : 71 hp (53 kW)
Voltage : 600V maximum
Moter Type : Permanent magnet AC synchronous motor

Other than that, I don't have any information.
Click to expand...
It is quite simple. It is a cascaded system. The motor output power at the shaft is 71 hp(53kW).
Assume some efficiency for PMAC motor(Approx= 0.94) & for Inverter(Approx=0.97).
Back calculate to find the output power (rating)of boost converter(53kW/(0.94*0.97)= 58.75kW).

Any OEM won't provide the exact efficiency of its parts(Like Inverter, Motor etc.) You have to take some safe approximation.
 
biswaIITH said:
It is quite simple. It is a cascaded system. The motor output power at the shaft is 71 hp(53kW).
Assume some efficiency for PMAC motor(Approx= 0.94) & for Inverter(Approx=0.97).
Back calculate to find the output power (rating)of boost converter(53kW/(0.94*0.97)= 58.75kW).

Any OEM won't provide the exact efficiency of its parts(Like Inverter, Motor etc.) You have to take some safe approximation.
Click to expand...
Thanks for your reply. You're right. However, in this system, the battery is our source. If the converter has 0.95 efficiency, the battery should supply 61,8 kw power to the converter. The nominal voltage value of the battery is 207.2 V. So, can the battery provide 298 Amper ?
 

orcuns91 said:
Thanks for your reply. You're right. However, in this system, the battery is our source. If the converter has 0.95 efficiency, the battery should supply 61,8 kw power to the converter. The nominal voltage value of the battery is 207.2 V. So, can the battery provide 298 Amper ?
Click to expand...
To answer your query ,I need to know What is the kWh rating of the battery pack???
 

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    orcuns91

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biswaIITH said:
To answer your query ,I need to know What is the kWh rating of the battery pack???
Click to expand...
I found the values for 2010. The nomial value of battery was 201.6 V. The last sentence confused me a lot.

The battery type used in Toyota Prius (3rd Gen.) is Nickel-
Metal Hydride (Ni-MH). Overall battery system consists of 168
series cell with 1.2 V and 6.35 Ah, which maintains 201.6 V
nominal battery voltage and 1.3 kWh capacity. Discharge curve
of the each cell in battery is shown in Fig. 2. The boost
converter input voltage varies between 235.2 V and 184.8 V
depending on the state of charge (SoC) of the battery. The boost
converter mostly operates at nominal operation area, which
corresponds to the battery voltage of 201.6 V. The battery can
supply a discharging power of 27 kW.
 

I also read 27 kW battery power and 650 V inverter voltage for 3rd gen. Respectively 27 kW should be the rated boost converter power and 650 V the output voltage.
 

orcuns91 said:
I found the values for 2010. The nomial value of battery was 201.6 V. The last sentence confused me a lot.

The battery type used in Toyota Prius (3rd Gen.) is Nickel-
Metal Hydride (Ni-MH). Overall battery system consists of 168
series cell with 1.2 V and 6.35 Ah, which maintains 201.6 V
nominal battery voltage and 1.3 kWh capacity. Discharge curve
of the each cell in battery is shown in Fig. 2. The boost
converter input voltage varies between 235.2 V and 184.8 V
depending on the state of charge (SoC) of the battery. The boost
converter mostly operates at nominal operation area, which
corresponds to the battery voltage of 201.6 V. The battery can
supply a discharging power of 27 kW.
Click to expand...
Ok. Every electric powertrain(Especially Motor ,Inverter etc) used in the world is defined by both continuous & peak power ratings(for few minutes).
Also the battery pack can discharge at higher ' C ' rate such as 1.5C,2C etc for some duration depending on the chemistry & sophisticated cooling method used.
So the input continuous power for boost will be around 27kW & peak power will be 61 approx.

BTW what is the exact model no of Prius??
 
biswaIITH said:
Ok. Every electric powertrain(Especially Motor ,Inverter etc) used in the world is defined by both continuous & peak power ratings(for few minutes).
Also the battery pack can discharge at higher ' C ' rate such as 1.5C,2C etc for some duration depending on the chemistry & sophisticated cooling method used.
So the input continuous power for boost will be around 27kW & peak power will be 61 approx.

BTW what is the exact model no of Prius??
Click to expand...


For 2020, you can check from the link. The electrical specs are the same for all models.
www.toyota.com

2024 Toyota Prius Specifications | Toyota.com

Browse through the full specs of the 2024 Toyota Prius to find out how this stylish Toyota hybrid car can enhance the time you spend behind the wheel.
www.toyota.com www.toyota.com

For 2010, there is a publication published by the U.S. Department of Energy. All the details about the hybrid drive system are available in the publication. However, I asked my question because I wanted to prepare according to the new technical specs of 2020.

thank you for answering
 
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