Advantages and disadvantages of thyristor dimming

Advantages and disadvantages of thyristor dimming

When the thyristor is dimming, it destroys the sine wave waveform of the mains and has the following disadvantages:

1 Reduces the power factor value, usually PF is lower than 0.5, and the smaller the conduction angle, the worse the power factor (only 0.25 at 1/4 brightness).
2 further increases the harmonic factor.
3 Serious interference signal (EMI) is generated on the line
4 It is easy to be unstable at low load, and a bleeder resistor must be added for this, which consumes at least 1-2 watts of power.
5 The LC filter at the input causes the thyristor to oscillate, producing audible noise and flicker.

Although thyristor dimming has so many shortcomings and problems, it has certain advantages, that is, it has formed an alliance with incandescent halogen lamps, occupying a large Dimming market. If LEDs are to take the place of thyristor-dimmable incandescent and halogen lamps, they must also be compatible with thyristor dimming.
Specifically, in some places where thyristor dimming incandescent or halogen lamps have been installed, thyristor dimming switches and knobs have been installed on the wall, and two lights leading to the lamps have been installed in the wall. connecting line. It is not easy to replace the thyristor switch on the wall and increase the number of connecting wires. The easiest way is to keep everything unchanged, just unscrew the incandescent lamp on the lamp head and replace it with a compatible thyristor switch. Light function LED bulbs will do.

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