The **EVAL-R** series typically refers to evaluation boards developed by **STMicroelectronics**, specifically designed for testing and prototyping their **Silicon Carbide (SiC) MOSFETs** and power modules. These boards are essential for engineers looking to evaluate performance in high-power applications like electric vehicle (EV) chargers and industrial motor drives. --- ### 1. Key Electronic Components of EVAL-R Boards The architecture of an EVAL-R board is divided into several critical stages to handle high-voltage power conversion. | Component Category | Description | Common Parts / Examples | | :--- | :--- | :--- | | **Power Switches** | The core of the board, usually SiC MOSFETs. | SCTWA90N65G2V, SCT040H65G3AG | | **Gate Drivers** | High-speed ICs that control the switching of the MOSFETs. | STGAP2S (Isolated Gate Driver) | | **Cooling System** | Heatsinks and thermal interfaces to manage high heat dissipation. | Aluminum Heatsinks / Thermal Pads | | **DC Link Capacitors** | Used for energy storage and smoothing the DC voltage. | High-voltage Polypropylene Film Caps | | **Current Sensors** | Monitors the output or phase current for control and protection. | Shunt resistors or Hall Effect sensors | --- ### 2. Functional Block Diagram Analysis 1. **Input Stage:** Usually accepts a high-voltage DC input (up to 800V or more depending on the specific model). 2. **Logic/Control Interface:** Headers meant to connect to a microcontroller (like an STM32) to send PWM (Pulse Width Modulation) signals. 3. **Galvanic Isolation:** Essential for safety; it separates the low-voltage control logic from the high-voltage power side using optocouplers or magnetic isolators. 4. **Protection Circuitry:** Includes Over-Current Protection (OCP) and Over-Temperature Protection (OTP) components to prevent board failure during testing. --- ### 3. Usage Context (Technical Specifications) The EVAL-R boards are built to showcase the benefits of Silicon Carbide technology over traditional Silicon (Si) IGBTs. ```cpp // Example: Conceptual PWM Control for EVAL-R via STM32 void Start_Power_Stage() { HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_1); // High Side HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_2); // Low Side // The EVAL-R board processes these signals through the STGAP driver } ``` #### Notable Advantages of these Parts: * **High Thermal Conductivity:** SiC parts allow for smaller heatsinks. * **Low Switching Losses:** Enables higher frequency operation (up to 100kHz+). * **High Voltage Rating:** Typically rated for 650V or 1200V applications. ---