SDAA154 October   2025 AMC0300D , AMC0300D-Q1 , AMC0300R , AMC0306M05 , AMC0306M05-Q1 , AMC0306M25 , AMC0306M25-Q1 , AMC131M03 , AMC131M03-Q1 , AMC3301 , AMC3301-Q1 , AMC3302 , AMC3302-Q1 , AMC3306M05 , AMC3306M05-Q1 , AMC3306M25 , AMC3306M25-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Detailed Description
    1. 2.1 Cost Optimized Power Supplies
      1. 2.1.1 Transformer Winding
      2. 2.1.2 Gate Driver Supply with Zener Diode
      3. 2.1.3 Gate Driver Supply with LDO
    2. 2.2 Simplified Power Supplies:
      1. 2.2.1 Integrated DC/DC Converter Power Supply
      2. 2.2.2 Discrete Transformer
    3. 2.3 Isolated Current Sensing Locations in High Voltage Power Conversion
      1. 2.3.1 Introduction
      2. 2.3.2 Rectifier (AC to DC Converter)
      3. 2.3.3 DC/DC
      4. 2.3.4 Inverter (DC to AC Converter)
  6. 3Summary
  7. 4References

2.3.2 Rectifier (AC to DC Converter)

Rectifier Block Diagram (AC to DC Converter)Figure 2-6 Rectifier Block Diagram (AC to DC Converter)

The rectifier is in charge of turning AC voltage into DC voltage. Isolated current sensing is needed in the rectifier to know the power going in and out of the system. Applications include the on-board charger (OBC) in automotive, motor drive, and metering applications. There are two isolated current sensing locations. The first location, indicated by the blue box in Figure 2-6 is in the Point of Common Coupling (PCC), which is before the EMI filter and after the contactor. The best choice is to use a no gate driver present design. The second location, indicated by the red box in Figure 2-6 , is in the Power Factor Correction (PFC) stage, which is after the EMI filter. The best choice is to use a gate driver present design using the high-side gate driver supply of each phase to power the corresponding device. Typically, only one isolated current sensing location is required in the rectifier, but with trends such as vehicle-to-everything (V2X), TI recommends having isolated current sensing in both locations due to bidirectional capabilities.