How to Design an AC Dimmer Circuit with Arduino

TL;DR

To design an AC dimmer circuit using Arduino, incorporate a bridge rectifier, optocoupler, and TRIAC. The zero crossover detector initiates the dimming process by detecting AC signal transitions, while the delay in triggering the TRIAC allows for varying brightness levels by chopping the waveform. Simulation with Proteus software can help verify circuit functionality.

Transcript

hey guys today in this video we are going to design our own dimmer circuit and we will implement it on proteus will check its response whether it will work or not but in our previous video we have interfaced a robotnine dimmer with node mcu and we took help of blink app to control the brightness or you can say team a filament lamp and in this video... Read More

Key Insights

• 🌉 Designing a dimmer circuit requires components such as a bridge rectifier, optocoupler, resistors, and an Arduino.
• 0️⃣ Zero crossover detector circuits are used to detect zero crossings in the AC signal and trigger the dimming process.
• 🎮 Triggering circuits, using optocouplers and TRIACs, are used to drive the AC load and control the dimming level.
• 😵 Delaying the trigger signal after a zero cross allows for different levels of dimming by chopping off portions of the AC waveform.
• 👻 The simulation in Proteus software allows for testing and verifying the functionality of the dimmer circuit.
• 😴 The programming part involves making changes to the pin numbers in the code and checking the preferences for compilation.
• 🎚️ A potentiometer is used to vary the delay and achieve different levels of dimming in the simulation.

Questions & Answers

Q: How does the zero crossover detector circuit work?

The zero crossover detector circuit uses a bridge rectifier and resistors to limit current and detect zero crossings in the AC signal. It drives an optocoupler, which is connected to the interrupt pin of an Arduino. The interrupt pin is connected to a pull-up resistor for proper detection.

Q: How does the triggering circuit work?

The triggering circuit uses an optocoupler (MOC3021) and a TRIAC to drive the AC load. The optocoupler's internal LED is driven by an output pin of the Arduino. When the LED is on, the transistor turns on, allowing current to flow through the TRIAC and connecting the AC load.

Q: What happens during a zero cross detection?

When a zero cross is detected, a pulse is sent to the interrupt pin of the Arduino. This triggers a high signal to be sent to the optocoupler's input pin, turning on the TRIAC. This results in the AC load being fully connected, and the bulb glowing at full brightness.

Q: How does the dimming process work?

By delaying the high signal sent to the optocoupler's input pin after a zero cross, the TRIAC remains off for a certain period, chopping off a portion of the AC waveform. This reduces the RMS value of the waveform, resulting in dimming of the bulb. Varying the delay within the range of 0 to 10 milliseconds allows for different levels of dimming.

Key Insights:

• Designing a dimmer circuit requires components such as a bridge rectifier, optocoupler, resistors, and an Arduino.
• Zero crossover detector circuits are used to detect zero crossings in the AC signal and trigger the dimming process.
• Triggering circuits, using optocouplers and TRIACs, are used to drive the AC load and control the dimming level.
• Delaying the trigger signal after a zero cross allows for different levels of dimming by chopping off portions of the AC waveform.
• The simulation in Proteus software allows for testing and verifying the functionality of the dimmer circuit.
• The programming part involves making changes to the pin numbers in the code and checking the preferences for compilation.
• A potentiometer is used to vary the delay and achieve different levels of dimming in the simulation.
• The video provides a PCB design file for the dimmer circuit using EasyEDA software.

Summary & Key Takeaways

• The video explains how to design a dimmer circuit using components such as a bridge rectifier, optocoupler, resistors, and an Arduino.

• The zero crossover detector circuit, which uses a bridge rectifier and resistors, is used to detect zero crossings in the AC signal.

• The triggering circuit, using an optocoupler and a TRIAC, is used to drive the AC load and control the dimming of the bulb.