TPS54360 in battery charging control

Gansheng Ou

Other Parts Discussed in Thread: TPS54360, BQ24650, SM72295, TIDA-00120

Hi,

My initial plan is: Use LTC4015 to control charging activity on 24V lead acid battery from solar panel(its Max Power Point Voltage is 36V, and Open Circuit Voltage 45V). Since LTC4015's max input voltage is 35V, TPS54360 is used to regulate it's input volatage to 32V between solar panel and LTC4015.

The concerning about this plan are:
1.LTC4015's Max Power Point Tracking is not used directly in this plan because solar panel voltage output is not able to directly contect to LTC4015 input, but via TPS54360 regulating to 32V as input.
2.TPS54360 is not be able to provide Max Power Point Current because TPS54360 is a PWM controller.

I appreciate your any input to the concerning.

Thank you,
Gansheng

over 8 years ago

0 David Wiest Jr over 8 years ago

TI__Genius 11480 points

Hi Gansheng,

If you want to track the solar panels MPP, you may be able to to do indirectly by attenuating the voltage and sampling that at the LTC pin that tracks the MPP. This way, you will at least get some indication that your solar panel is crashing.

As long as you are operating "above" your MPP (the panel is not crashing), it will probably be fine. Your system will be functional, at least.

0 Gansheng Ou over 8 years ago in reply to David Wiest Jr

Intellectual 450 points

Hi David,

Would you have a better hardware structure for design of "control charging activity on 24V lead acid battery from solar panel(its Max Power Point Voltage is 36V, and Open Circuit Voltage 45V)"? Welcome any input.

Thanks,

Gansheng

0 David Wiest Jr over 8 years ago in reply to Gansheng Ou

TI__Genius 11480 points

Hi Gansheng,

With the current products available, I don't think there is an easy way to do so. For example, using the bq24650 (our solar charger), you can make several modifications to alter the given application circuit to what you are trying to do, but it is not easy by any means. I think this route is the easiest (even if it isn't the most effective).

0 Gansheng Ou over 8 years ago in reply to David Wiest Jr

Intellectual 450 points

Hi David,

How would you think about sm72295? It is a photovoltaic full bridge driver, and there is evaluation board TIDA-00120.

Thanks,
Gansheng

0 David Wiest Jr over 8 years ago in reply to Gansheng Ou

TI__Genius 11480 points

Gansheng,

After looking at the reference design, that seems like it may be useful... if not directly applicable, you could probably make minor modifications to fit your needs.

0 Gansheng Ou over 8 years ago in reply to David Wiest Jr

Intellectual 450 points

Hi,

In the project TPS54360 regulates output voltage to 35V from input from 0 to 60V. When Vin above 35V, output will be 35V, but if Vin below 35V, what is the output voltage? Is it Vout = Vin? or Vout =0?

Thanks,

Gansheng

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TPS54360 in battery charging control