TIDUFD2A May   2025  – October 2026

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Terminology
    2. 1.2 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Input Capacitors Selection
      2. 2.2.2 DC Side
      3. 2.2.3 AC Side
    3. 2.3 Highlighted Products
      1. 2.3.1 TMDSCNCD28P55X - controlCARD Evaluation Module
        1. 2.3.1.1 Hardware Features
        2. 2.3.1.2 Software Features
      2. 2.3.2 LMG2104R022
      3. 2.3.3 AMC3302
      4. 2.3.4 UCC21550A
      5. 2.3.5 TMCS1133 - Precision 1MHz Hall-Effect Current Sensor With Reinforced Isolation
      6. 2.3.6 INA185 - 26V, 350kHz, Bidirectional, High-Precision Current Sense Amplifier
      7. 2.3.7 LM5164 – 100V Input, 1A Synchronous Buck DC-DC Converter With Ultra-Low IQ
      8. 2.3.8 UCC34141-Q1
  9. 3System Design Theory
    1. 3.1 Isolation for Solar Inverters
    2. 3.2 Topology Overview
    3. 3.3 Control Theory
      1. 3.3.1 Single and Extended Phase Shift Modulation Technique
      2. 3.3.2 Zero Voltage Switching and Circulating Current
      3. 3.3.3 Optimized Control Method
      4. 3.3.4 Dead-Time Compensation
      5. 3.3.5 Frequency Modulation
      6. 3.3.6 Controller Block Diagram
    4. 3.4 MPPT and Input Voltage Ripple
  10. 4Hardware, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
    2. 4.2 Software Requirements
    3. 4.3 Test Setup
      1. 4.3.1 Board Check
      2. 4.3.2 DC-DC Tests
      3. 4.3.3 DC-AC Tests
      4. 4.3.4 AC-DC Tests
      5. 4.3.5 DC-AC Offgrid Tests
    4. 4.4 Test Results
      1. 4.4.1 Efficiency and iTHD
      2. 4.4.2 Operating Waveforms for Various Loads
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
    2. 5.2 Tools and Software
    3. 5.3 Documentation Support
    4. 5.4 Support Resources
    5. 5.5 Trademarks
  12. 6About the Author
  13. 7Revision History

2.2.2 DC Side

Figure 2-2 shows the DC input side schematic. This image illustrates the shunt current sensing network based on INA185. The INA185 is a bidirectional, current-sense amplifier (also called a current-shunt monitor) that senses the voltage drop across a 1mΩ current-sense resistor. The INA185A2 version has a gain of 50V/V and a reference of 1.65V. These parameters result in the input current range of ±16.5A. The voltage sensing is based on the low-cost TLV9002 operational amplifier.

TIDA-010954 Full-Bridge ConverterFigure 2-3 Full-Bridge Converter

Figure 2-3 shows the full-bridge converter is comprised of two LMG2104R022 power stages. The LMG2104R022 is half-bridge power stage with integrated gate-driver and enhancement-mode Gallium Nitride (GaN) FETs. GaN FETs provide significant advantages for power conversion because these FETs have zero reverse recovery and a very small output capacitance, COSS.