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43 lines
3.2 KiB
43 lines
3.2 KiB
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<meta name="Author" content="Rod Elliott - Elliott Sound Products">
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<title>Dimmer Phase Angle Test</title>
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<table style="width:100%" class="tblblue">
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<tr><td class="hdrl"> Elliott Sound Products</td>
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<td align="right" class="hdrr">Dimmer Phase Angle Test </td>
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</tr></table>
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<p>These results were obtained from a circuit simulator, which allowed me to capture all the data I needed, without having to use test equipment attached to the mains. The results are not quite the same as with a real lamp, because the filament actually changes its resistance with temperature. The table below shows the theoretical power, current and power factor, ignoring the changing resistance.</p>
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<center><table style="width:50%" border="1">
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<tr class="tbldark"><td><b>Phase Angle</b></td><td><b>Volts <sub>RMS</sub></b></td><td><b>Current <sub>RMS</sub></b></td><td><b>Power</b></td><td><b>Power Factor</b></td></tr>
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<tr><td>18°</td><td>19.28 V</td><td>33.47mA</td><td>645.3 mW</td><td>0.08</td></tr>
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<tr><td>36°</td><td>52.93 V</td><td>91.89 mA</td><td>4.86 W</td><td>0.22</td></tr>
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<tr><td>54°</td><td>92.53 V</td><td>160.6 mA</td><td>14.86 W</td><td>0.39</td></tr>
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<tr><td>72°</td><td>132.9 V</td><td>230.7mA</td><td>30.65 W</td><td>0.55</td></tr>
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<tr><td>90°</td><td>169.7 V</td><td>294.6 mA</td><td>50.00 W</td><td>0.71</td></tr>
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<tr><td>108°</td><td>199.9 V</td><td>347.0 mA</td><td>69.35 W</td><td>0.83</td></tr>
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<tr><td>126°</td><td>221.4 V</td><td>384.5 mA</td><td>85.14 W</td><td>0.92</td></tr>
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<tr><td>144°</td><td>234.1 V</td><td>406.4 mA</td><td>95.14 W</td><td>0.98</td></tr>
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<tr><td>162°</td><td>339.2 V</td><td>415.3 mA</td><td>99.35 W</td><td>0.99</td></tr>
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<tr><td>180°</td><td>240.0 V</td><td>416.7 mA</td><td>100.00 W</td><td>1.00</td></tr>
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</table>
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<b class="t-pic">Power vs. Phase Angle For TRIAC Dimmer</b>
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</center>
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<p>For the simulation, I used a 100W load, based on a supply voltage of 240V. This gives a resistance of 576 ohms, which is 100W at 240V. The phase angle is a measure of how many degrees of each half-cycle the dimmer allows through, and is in 10 steps. The power factor is as shown in the table above, and at most usable settings, it's no worse than a typical CFL. Since those pushing for a ban of incandescent lamps have never looked at power factor anyway, to them it is presumably irrelevant. <img src="grin.gif" alt=":-)"></p>
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<p>To explain the table, a cycle of mains power is traditionally divided into 360°, so a half-cycle is 180°. I used 10 steps of 18° for the table, but real dimmers can use any phase angle as set by the control - they are not limited to discrete steps.</p>
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