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

3.1 Requirements on Bypass Circuit

There are three requirements on the bypass circuit to make this a better design than the traditional designs.

  • High Input Voltage: Minimum 100V rated design to cover common single solar panel with rated input voltage up to 80V (plus 20V margin). Minimum 150V rated design to cover two solar panels in series with rated input voltage up to 125V (plus 25V margin).
  • Low Power loss: MOSFET with lower power loss needs to be used, instead of P-N junction diodes or Schottky diodes.
  • Standalone: Bypass circuit needs to be independent from other circuits, which means even other circuits fail, this does not affect the bypass circuit.