Скачать с ютуб Improved Triac circuit в хорошем качестве

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.