SNOAAA8 April   2025 LM74610-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 What is MLPE
    2. 1.2 Why, When, Where Needs MLPE
    3. 1.3 What is Solar Power Optimizer
    4. 1.4 Solar Power Optimizer Working Principle
    5. 1.5 Output Bypass Function of Solar Power Optimizer
  5. 2Traditional Designs of the Bypass Circuit
    1. 2.1 Design 1 - Using P-N Junction Diode or Schottky Diode
    2. 2.2 Design 2 - Using MOSFET
  6. 3New Design of the Bypass Circuit
    1. 3.1 Requirements on Bypass Circuit
    2. 3.2 Using Ideal Diode Controller LM746x0-Q1
    3. 3.3 Challenges of Using Ideal Diode Controller
    4. 3.4 Working Principle of LM746x0-Q1 Reverse Voltage Range Extension
  7. 4Bench Test and Result
  8. 5Summary
  9. 6References

1.5 Output Bypass Function of Solar Power Optimizer

Figure 1-15 shows that the optimizers are deployed parallel to the corresponding PV panels. Now the PV string is actually connected by the outputs of optimizer. Supposing that there has damage on the panel or the power stage (MPPT DC-DC) of the optimizer, how the string can still work? Figure 1-15 shows the simplified block diagram of the optimizer. There has a bypass circuit that provides another path allowing the string current around the damaged panel or the power stage of the optimizer.

Simplified Block Diagram of Solar Power Optimizer Figure 1-15 Simplified Block Diagram of Solar Power Optimizer

Figure 1-16 shows how the bypass function works. In this example, the second PV panel is broken, now the string current does not pass through this PV panel, the string current passes through the bypass circuit inside the optimizer.

Output Bypass Function of Solar Power Optimizer Figure 1-16 Output Bypass Function of Solar Power Optimizer