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Troubleshooting with spv1040 MPPT

Question asked by Li.Zhongxi on Dec 9, 2016
Latest reply on Jan 4, 2017 by Li.Zhongxi

Hi,

 

We designed a battery charger using SPV1040.

  • The output voltage is fine;
  • however, during the charging process, there is a large fluctuation on the input voltage : 500mV ~ 1V. Ideally. This input voltage should stay close to Vmpp, which is 1V in our case. Since it's fluctuating, the resultant MPPT efficiency is very bad.

 

The diagram is attached below. Is that because we didn't settle the output current sensor resistors? The datasheet implies that it is only used for over current protection, which is not required by us so we simply grounded the I_plus and I_minus.

Many thanks for your help!

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