STEVAL-SID140V1 Isolated Thyristors Driver Evaluation Board

Introduction

The STMicroelectronics STEVAL-SID140V1 is an evaluation board designed to demonstrate isolated control of thyristor-based AC solid-state relays. Built around the STSID140-12 isolated thyristor driver, it provides a practical platform for evaluating SCR switching in AC load-control applications.

Part Description

The STEVAL-SID140V1 integrates an STSID140-12 isolated thyristor driver with two TN5015H-8G SCRs connected in an antiparallel, back-to-back arrangement. This configuration enables control of alternating-current loads, allowing current flow during both halves of an AC waveform.

The board is intended for loads up to 4 A and offers galvanic isolation rated at 1250 VRMS between the control and power sides. This isolation helps protect low-voltage control electronics from hazardous AC mains or higher-voltage load circuits.

An optional AC mains zero-cross triggering capability is also supported. Zero-cross switching can reduce electrical noise, inrush-related stress, and electromagnetic interference when switching suitable resistive AC loads.

Applications

Potential applications for the STEVAL-SID140V1 include:

• AC solid-state relay evaluation
• Isolated SCR gate-drive testing
• AC load switching prototypes
• Resistive heater control
• Lamp and lighting load switching
• Small AC motor control experiments
• Mains-powered appliance control
• Zero-cross switching evaluation
• Industrial AC output modules
• Embedded controller isolation testing

Industries

Possible industries using this type of evaluation board include:

• Industrial automation
• Building automation
• Smart home and consumer appliances
• Heating, ventilation, and air conditioning
• Lighting control
• Energy management
• Laboratory and test equipment
• Power electronics development
• Process control
• Electrical engineering education

Usage Ideas

1. Isolated Heater Controller
   Pair the board with a microcontroller and temperature sensor to prototype an isolated AC heater controller for a small resistive heating element.

2. Zero-Cross Lamp Switching Module
   Use the zero-cross triggering option to investigate low-noise switching of an AC incandescent or compatible resistive lighting load.

3. PLC-Style AC Output Demonstrator
   Connect an isolated digital control signal to the board and create a demonstration of an industrial programmable logic controller output driving a low-current AC load.

Conclusion

The STEVAL-SID140V1 provides a convenient development platform for evaluating the STSID140-12 isolated thyristor driver in AC solid-state relay designs. With back-to-back SCRs, support for AC loads up to 4 A, 1250 VRMS galvanic isolation, and optional zero-cross operation, it is well suited for prototyping and studying isolated AC switching solutions.