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circuitguru
United Kingdom
เข้าร่วมเมื่อ 20 เม.ย. 2019
Improved Triac circuit
* Theoretical analysis: up to 6:14min
* Practical analysis with oscilloscope: 6:14 to 13:09.
In this video, we discuss how the phase shift between the input voltage and the timing capacitor introduces a hysteresis when the circuit operates at high phase angles (lowest dimming settings). This can cause flickering as the phase angle timing may be wrong or missed. In addition, when the dimmer is started, a 'pop' effect is often seen, where the circuit does not start until the phase angle is reduced and then increased again, for example where a bulb brightness must first be increased at turn on, before it can be reduced to the lowest settings.
The circuit comprises a method to remove any residual charge from the timing capacitor at each zero crossing, so as to give the circuit an accurate starting time base, at every phase angle of operation
The Video covers the detailed explanation of the circuit, together with a practical overview of the produced waveforms, including a comparison between the generic circuit and the new improved version.
* Practical analysis with oscilloscope: 6:14 to 13:09.
In this video, we discuss how the phase shift between the input voltage and the timing capacitor introduces a hysteresis when the circuit operates at high phase angles (lowest dimming settings). This can cause flickering as the phase angle timing may be wrong or missed. In addition, when the dimmer is started, a 'pop' effect is often seen, where the circuit does not start until the phase angle is reduced and then increased again, for example where a bulb brightness must first be increased at turn on, before it can be reduced to the lowest settings.
The circuit comprises a method to remove any residual charge from the timing capacitor at each zero crossing, so as to give the circuit an accurate starting time base, at every phase angle of operation
The Video covers the detailed explanation of the circuit, together with a practical overview of the produced waveforms, including a comparison between the generic circuit and the new improved version.
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These regulators need a noise suppression circuit
But what about with 240Vac input
Thanks for you
Excelente, saludos from México
Which threshold-value does D5 have?
Does it matter where you put the load?
It sure does, just ask your dad
Now to answer your question in seriousness, no it does not. You can put it at the "top", as shown at 3:57 (conected to the resistors R2, R4 and R3), or at the "bottom" (connected to D2, C1 and D4). It also does not matter whether the top AC terminal is live and bottom is neutral or vice versa, since the input is (typically) just a symmetrical sinusoidal AC wave.
Although not explicitly indicated with a + sign, the capacitor symbol shown is typical of a polarized capacitor.
Where can I see the final schema? Also can it be adopted for 230V mains?
Which circuit can be used for 240v?
Very cool! I got some 4x40 displays and im hoping to get this trick to help
If the original works, this one will too - But only on AVR based arduino boards. I just came back for it! You can find schematics and library here: forum.arduino.cc/t/hd44780-boards-using-spi-interface/370420 It is called LC4bitSPI.zip and it is just imported as any other library. Inside the library, there is an example, basically tou just add these two lines to the very top of the code: #include <LC4bitSPI.h> LiquidCrystal lcd(5); The number 5 is the pin used for the SPI CS pin. Other pins can be used, with exception for the SPI pins themselves and the analogue pins (Ax). If you were using the original library, delete any other numbers there, that were used for the paralel pins. The remaining pins are just SPI, same ones on the 6 pin programming connector, with exception of Reset. Good Luck!
Howdy. Absolutely great. Regards.
Electrolytic cap charged to -20v ? On your pcb can't see the c1 (electrolytic one)
Can the flickering of the bulb be prevented if a small size reactor coil is used in series with the triac? Please do explain.
Hello, by far the best video on the subject after quite some searches One question, you say that 2 components are optional at the start How can I read in data sheet if the trial can manage or not faulty current (you said something like that ) The triac I have is m12jz47 for an ac motor speed control of a vaccum cleaner Brgds
You are talking at 10:30 or so about three quadrant and four quadrant triac
So the led is not compatible as it requires too little current? Too efficient is a problem now XD
Thank you sir, so helpful
Thank you very much for sharing this knowledge , I have been looking for a useful information about controlling AC source and this is the best , but I would kindly request you place the load in your schematic , also the reason to search for this practical triac triggering technique is , I am looking for a project about controlling the speed if an AC induction motor with TRIAC and your work here is a good foundation for me , I would also suggest if possible you can try and share the same with AC motor Once again thank you r for the great work
This is an excellent circuit, The Diodes seem to cater for the peak of the 120 Volt supply and 600 Volts is being extra safe. The capacitor C! at 7:42 is shown as an electrolytic but this C1 has to accept both polarities. A good idea and it provides a great improvement to the unit.
This was a very thorough explanation and also complete with all possible visual perspective and analysis. If a person does not understand the diac and triac after reviewing this video I would be very surprised. Best Triac video ever made in the history of mankind. No, I’m not exaggerating.
I agree. Very well explained. Also got to be the simplest working triac circuit I've seen. Very easy to understand.