So to summarise mains dimmers that are LED compatible have two separate min — max ranges; one for LEDs and the other for incandescent or halogen lamps. In addition we also stock a range of Varilight dimmers which are recommended for dimming LED. Compatibility is not a problem with old incandescent or halogen light bulbs. You can browse the range here. You must be logged in to post a comment. Compact fluorescent bulbs also known as CFL or stick shape should be taken as non-dimmable unless stated on the bulbs packaging. Both types of dimmer can work with dimmable LEDs however due to its advantages, trailing edge is the preferred and as such LED manufacturers have designed their retrofit lamps to work best with this type.
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For this reason, buck-boost converters and tapped-buck drivers with ICs, which switch through the whole line cycle as the LYTSwitch-4 from Edg Integrations, can pull down the dimmer voltage after it turns off and are therefore better able to support trailing-edge dimmers.
Research both the lamps and the dimmer switch before buying so that you know you have a combination that works. This ensures that the zero-crossing detector will turn on the switch at the beginning of the next voltage half-line cycle. Phase-cut dimmers, either leading-edge or trailing-edge, make up the bulk of the dimmer market. Sign Up for Our Newsletter: Both types of dimmer can work with dimmable LEDs however due to its advantages, trailing edge is the preferred and as such LED manufacturers have designed their retrofit lamps to work best with this type.
In the simplest form, the bleeder is a simple RC combination that insures a pulse of current when the input voltage is applied. Check the min and max loads of the switch are suitable for the number of, and combined wattage of, lamps in the circuit.
The designer trades off efficiency in order to achieve best possible dimmer compatibility but is not able to guarantee performance due to the variability of dimmer component values.
The dimmer manufacturer will provide the min-max levels of load and the lamp manufacturer will provide a list of all the compatible dimmers they have tested their bulbs with.
A Buck-boost converter continues switching provides a low impedance to the input when the input voltage has fallen below output voltage, llghtech this topology more suitable for trailing-edge dimmers. One Response to Leading-Edge vs. Trailing-edge dimmers require the input voltage of the LED driver to fall to zero each half-cycle to enable the dimmer controller to energize its own supply rails. In addition we also traling a range of Varilight dimmers which are recommended for dimming LED.
Leading-Edge vs. Trailing-Edge Dimmers | LED Journal
It will continue to conduct until the forward current drops below a threshold holding current. Trailing-Edge Dimmers zoe says: After the input voltage rises following the zero crossing, leading edge dimmers inhibit for a period of time, controlling energy trailkng to the lamp load and hence output brightness. In order to insure that I L is achieved, a bleeder circuit lighhtech typically added to the LED driver input stage.
A w Incandescent or Halogen dimmer may have a w loading when used in conjunction with an LED light source. Trailihg bleeder is optimized with respect to the power rating of the LED driver.
Leading-Edge vs. Trailing-Edge Dimmers
Can it be dimmed? The MOSFET switch is driven by a controller which continually energizes the gate, making the dimmer less susceptible to current ringing. Simplified schematic of a leading-edge phase-cut dimmer Including transient and surge suppression elements LS and CS.
There are two types of dimmer switch for mains dimming in your home; leading edge and trailing edge. For a trailing-edge dimmer if insufficient current is drawn to force a zero-crossing before the next half-line cycle, the dimmer may diming, causing shimmer or flicker.
Dimming LEDs – The difference between leading and trailing edge
Prior to joining PI, Andrew spent 11 years as a power supply design engineer before transitioning to a sales and marketing role at Advance Power, then Vishay Siliconix. These two types of phase cutting dimmer get their names from the part of the AC wave that they cut off. If you wish to dim your LED Light source you will need to make sure that your LED is dimmable, this will be clearly stated on the box and will look something like this:.
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However as technology has advanced to become more efficient and environmentally friendly, dimming has become more complicated. Our range of LED dimmers are changeable egde trailing edge and leading edge modes but are set to trailing edge mode by default.
So to summarise mains dimmers that are LED compatible have two separate min — max ranges; one for LEDs and the other for incandescent or halogen lamps.