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AN2711 Datasheet(PDF) 8 Page - STMicroelectronics |
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AN2711 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 36 page Background AN2711 8/36 Doc ID 14425 Rev 3 Figure 3. Line voltage (yellow) and line current (green) into the unloaded EMI filter With the dimmer phased back, when the Triac fires the current rings repeatedly through zero, and the holding current comes and goes. The thyristor may turn off until it is again triggered by the pulse generator. Figure 4. Thyristor current due to L-C ringing 1.2 Damping circuits If the Triac is to remain in control, current reversals between triggering and the voltage zero crossing must be eliminated. STMicroelectronics has developed a way to do this without violating existing patents, and a patent for this technique has been applied for. The patent is licensed to anyone using ST semiconductors at no charge. Figure 5 shows a damping network according to our patent application. C5 and R1 provide holding current to the Triac until the filter ringing dies down. If properly sized, ringing is minimized with little loss. The values shown are appropriate for about 30-60 W output. |
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