dimmer into two categories: the forefront of cutting-and tangential phase-type.

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[1]. Cutting-edge phase cutting dimmer is the beginning of the half-cycle power cut. After a period of time corresponding to the location of the dimmer switch only turns on for the end of the load power supply up to half cycle. After 0:00, repeat the same operation.


[2]. Tangential phase dimmer switch is in the beginning of the half cycle conduction downlight led after a period of time corresponding to the location of the dimmer, and disconnected to keep to the end of the half cycle. After 0:00, repeat the same operation.


To complete the cutting phase, the main use of two technologies: TRIAC (triac) switch or transistor switch. TRIAC dimmer and more cutting-edge phase cutting dimmer. Transistor switch can be either the forefront of cutting phase dimmer can also be tangential dimmer. TRIAC dimmer problem is that it needs to meet the special conditions to work properly: TRIAC can trigger the gate to open, once activated, still needs a minimum current to maintain its conduction state. The trigger current is called "latch-up current, and in order to keep the TRIAC conduction current must be loaded for some time. Once the device latch must have a continuous supply of cur rent. This current is called the "keep current" if the current is broken or weakened, TRIAC will turn off. For compatibility with dimmers, LED lamps must be required to maintain current absorption dimmer. For example, if a 6W LED lights (roughly equivalent to a 40W incandescent bulbs) with a minimum load 10W dimmer with use, you need some additional circuitry to provide sufficient current to maintain. In this case, the light bulb efficiency will be reduced, compared with 40W high efficiency. Without this circuit, commercial led lighting lights do not work properly. Dimmer to keep current. Therefore, the greater the additional loss, better compatibility dimmer. Dimmable applications design difficulty is to find the best trade-off between the luminaire efficiency and dimmer compatibility.