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

2.1 Design 1 - Using P-N Junction Diode or Schottky Diode

Figure 2-1 shows the common and simplest method to achieve bypass function by using P-N junction diodes or Schottky diodes. This method is low cost, easy to use, and can achieve very high reverse voltage based on the diode selection. However, these drawbacks remain:

  • High power loss (0.7V/0.4V × 20A = 8 to 14 watts losses)
  • Severe thermal issue
  • Lower solar power generation efficiency
  • Large PCB size occupied because high current diodes needed
Diode Method of Bypass CircuitFigure 2-1 Diode Method of Bypass Circuit
Note: Bypass circuit using P-N junction diode or Schottky diode.