AN 973: Three-phase Boost Bidirectional AC/DC Converter for Electric Vehicle (EV) Charging

Download PDF
ID 733436
Date 6/23/2022
Public
Document Table of Contents
Document Table of Contents x
1. Three-phase Boost Bidirectional AC/DC Converter for Electric Vehicle (EV) Charging Design Example Overview 2. Downloading and Installing the Design Example 3. Model Description 4. FPGA Resource Use Comparison 5. Locating Top-level VHDL Wrapper 6. Generating HDL Code with MATLAB and HDL Coder 7. Simulink Simulation Results 8. Document Revision History for AN 973: Three-phase Boost Bidirectional AC/DC Converter for EV Charging
2. Downloading and Installing the Design Example x
2.1. Software Requirements 2.2. Hardware Requirements 2.3. Downloading and Installing the Design
3. Model Description x
3.1. Simscape* Model 3.2. Simulink* Model 3.3. HDL Inputs, Outputs, and Parameters
3.2. Simulink* Model x
3.2.1. Controller Block 3.2.2. Power Electronics Block Model 3.2.3. Source Voltage Generator Block
3.2.1. Controller Block x
3.2.1.1. Pulse Width Modulation (PWM) Controller 3.2.1.2. Phase-locked Loop (PLL) 3.2.1.3. Sampling Circuit 3.2.1.4. Clarke and Park Transforms
3.2.2. Power Electronics Block Model x
3.2.2.1. Six-switch Power Converter 3.2.2.2. Inductors 3.2.2.3. Output Capacitor
6. Generating HDL Code with MATLAB and HDL Coder x
6.1. Generating HDL and QPF Using MATLAB Scripts 6.2. Generating HDL and QPF Using MATLAB GUI Tools
1. Three-phase Boost Bidirectional AC/DC Converter for Electric Vehicle (EV) Charging Design Example Overview
2. Downloading and Installing the Design Example
3. Model Description
4. FPGA Resource Use Comparison
5. Locating Top-level VHDL Wrapper
6. Generating HDL Code with MATLAB and HDL Coder
7. Simulink Simulation Results
8. Document Revision History for AN 973: Three-phase Boost Bidirectional AC/DC Converter for EV Charging

3.2.2.3. Output Capacitor

In this model, there is a subblock to emulate the output capacitor or DC-link capacitor, for which you must consider an acceptable output voltage ripple. In the continuous-time domain, you can use the following standard electronics formula to obtain the capacitor value:

Where:

  • ΔV = 0.5 V, which is the acceptable output voltage ripple.
  • 1 x 10-5s is the inverse of the switching frequency.
  • 125 A is the maximum output current.

The voltage across the output capacitor (VDC ) is the integral of the current flowing into it as follows:

The inductor and switch models calculate the high side current, which is a split between the output capacitor (IC ) and load resistor (ILOAD ). Although VC is controlled to a DC voltage, the voltage on the capacitor terminals is relative to the ground (VDC_P and VDC_N ) switches up and down with the PWM of the switches. The calculation of VDC_P and VDC_N depends on the state of the PWM signals (0 or 1).

Then, calculate VDC_P using:

Level Two Title