{"id":6180,"date":"2026-03-17T12:14:35","date_gmt":"2026-03-17T04:14:35","guid":{"rendered":"https:\/\/bo-qi.com\/?p=6180"},"modified":"2026-03-17T12:14:35","modified_gmt":"2026-03-17T04:14:35","slug":"how-does-a-triac-dimmer-bq-ttdim-work","status":"publish","type":"post","link":"https:\/\/bo-qi.com\/fr\/how-does-a-triac-dimmer-bq-ttdim-work\/","title":{"rendered":"Comment fonctionne un variateur TRIAC BQ-TTDIM ?"},"content":{"rendered":"
L'\u00e9clairage semble souvent trop lumineux ou trop tamis\u00e9. Beaucoup de personnes souhaitent un contr\u00f4le fluide, mais rencontrent des difficult\u00e9s avec des gradateurs incompatibles et des drivers LED.<\/p>\n
Un gradateur TRIAC tel que le BQ-TTDIM contr\u00f4le la luminosit\u00e9 en coupant une partie de chaque forme d'onde AC. Il utilise un semi-conducteur TRIAC pour commuter le courant pendant chaque cycle AC, r\u00e9duisant la puissance d\u00e9livr\u00e9e \u00e0 la lampe et permettant un gradation fluide pour les lumi\u00e8res LED, halog\u00e8nes et incandescentes compatibles.<\/strong> \n
Forme d'onde de gradation par coupure de phase TRIAC<\/figcaption><\/figure><\/p>\n
This simple interface makes it easy for users to control lighting levels.<\/p>\n
\n
The Working Principle of the BQ-TTDIM TRIAC Dimmer<\/h2>\n
Many users know dimmers change brightness. However, few understand the electrical process behind the dimming effect.<\/p>\n
The BQ-TTDIM controls brightness by adjusting the conduction angle of the TRIAC during each AC cycle. A larger conduction angle delivers more power to the LED driver, resulting in higher brightness.<\/strong> \n
AC phase cut waveform dimming<\/figcaption><\/figure><\/p>\n
How Phase-Cut Dimming Controls Power<\/h3>\n
AC power follows a sine wave pattern.<\/p>\n
In a TRIAC dimmer:<\/p>\n
\n
The AC waveform begins.<\/li>\n
The dimmer delays the trigger signal.<\/li>\n
The TRIAC switches on at a certain angle.<\/li>\n
Current flows for the remainder of the half cycle.<\/li>\n<\/ol>\n
The later the TRIAC turns on, the less energy reaches the lamp.<\/p>\n
Role of the TRIAC Semiconductor<\/h3>\n
The TRIAC acts as an electronic switch.<\/p>\n
Important properties include:<\/p>\n
\n\n
\n
Property<\/th>\n
Explication<\/th>\n<\/tr>\n<\/thead>\n
\n
\n
Bidirectional conduction<\/td>\n
Works with AC current<\/td>\n<\/tr>\n
\n
Triggered by gate signal<\/td>\n
Turns on at specific voltage<\/td>\n<\/tr>\n
\n
Latching behavior<\/td>\n
Remains on until current drops to zero<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Because AC crosses zero twice every cycle, the TRIAC automatically resets.<\/p>\n
Adjusting the Conduction Angle<\/h3>\n
The rotary knob changes resistance in the timing circuit.<\/p>\n
This changes the delay before the TRIAC fires.<\/p>\n
Example dimming levels:<\/p>\n
\n\n
\n
Conduction Angle<\/th>\n
Power Delivered<\/th>\n
Brightness<\/th>\n<\/tr>\n<\/thead>\n
\n
\n
170\u00b0<\/td>\n
Haut<\/td>\n
Lumineux<\/td>\n<\/tr>\n
\n
120\u00b0<\/td>\n
Moyen<\/td>\n
Mod\u00e9r\u00e9<\/td>\n<\/tr>\n
\n
60\u00b0<\/td>\n
Faible<\/td>\n
Faible<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
This method is efficient because the dimmer does not dissipate large amounts of heat.<\/p>\n
Interaction Between Dimmer and LED Driver<\/h3>\n
When the waveform reaches the LED driver:<\/p>\n
\n
The driver receives chopped AC voltage.<\/li>\n
The driver detects the phase angle.<\/li>\n
Internal electronics adjust LED current.<\/li>\n<\/ol>\n
Good driver design ensures smooth dimming without flicker.<\/p>\n
Step-by-Step Dimming Process<\/h3>\n
The complete process works like this:<\/p>\n
\n\n
\n
Step<\/th>\n
Action<\/th>\n<\/tr>\n<\/thead>\n
\n
\n
1<\/td>\n
User rotates dimmer knob<\/td>\n<\/tr>\n
\n
2<\/td>\n
Timing circuit changes delay<\/td>\n<\/tr>\n
\n
3<\/td>\n
TRIAC triggers at new phase angle<\/td>\n<\/tr>\n
\n
4<\/td>\n
AC waveform portion changes<\/td>\n<\/tr>\n
\n
5<\/td>\n
LED driver adjusts output current<\/td>\n<\/tr>\n
\n
6<\/td>\n
LED brightness changes<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
This cycle repeats every AC waveform.<\/p>\n
\n
Leading Edge vs Trailing Edge Dimming in TRIAC Systems<\/h2>\n
Not all phase-cut dimming works the same way. Some dimmers cut the beginning of the waveform. Others cut the end.<\/p>\n
Leading edge dimming removes the beginning of the AC waveform, while trailing edge dimming removes the end. TRIAC dimmers traditionally use leading edge phase cutting.<\/strong> \n
Leading edge vs trailing edge dimming<\/figcaption><\/figure><\/p>\n
What Leading Edge Dimming Means<\/h3>\n
Leading edge dimming delays the start of the waveform.<\/p>\n
Once triggered, the remainder of the waveform passes through.<\/p>\n
Characteristics include:<\/p>\n
\n\n
\n
Fonctionnalit\u00e9<\/th>\n
Description<\/th>\n<\/tr>\n<\/thead>\n
\n
\n
Control device<\/td>\n
TRIAC<\/td>\n<\/tr>\n
\n
Utilisation courante<\/td>\n
Incandescent lamps<\/td>\n<\/tr>\n
\n
Co\u00fbt<\/td>\n
Faible<\/td>\n<\/tr>\n
\n
Bruit \u00e9lectrique<\/td>\n
Plus \u00e9lev\u00e9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
How Trailing Edge Dimming Works<\/h3>\n
Trailing edge dimming uses a different method.<\/p>\n
Instead of delaying the start, it cuts the end of the waveform.<\/p>\n
\n\n
\n
Fonctionnalit\u00e9<\/th>\n
Description<\/th>\n<\/tr>\n<\/thead>\n
\n
\n
Control device<\/td>\n
MOSFET<\/td>\n<\/tr>\n
\n
Noise level<\/td>\n
Plus bas<\/td>\n<\/tr>\n
\n
Compatibilit\u00e9 avec les LED<\/td>\n
Often better<\/td>\n<\/tr>\n
\n
Co\u00fbt<\/td>\n
Plus \u00e9lev\u00e9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Which Type Is Used in TRIAC Dimmers<\/h3>\n
Most TRIAC dimmers use gradation \u00e0 la pointe de la technologie<\/strong>.<\/p>\n
However, some advanced designs can simulate trailing edge behavior.<\/p>\n
The BQ-TTDIM is described as a trailing edge rotary phase-cut dimmer<\/strong> in the product manual.<\/p>\n
This improves compatibility with many LED drivers.<\/p>\n
Advantages and Limitations<\/h3>\n
Each dimming method has strengths.<\/p>\n
\n\n
\n
M\u00e9thode<\/th>\n
Avantages<\/th>\n
Limitations<\/th>\n<\/tr>\n<\/thead>\n
\n
\n
\u00c0 la pointe de l'innovation<\/td>\n
Simple, low cost<\/td>\n
Higher EMI<\/td>\n<\/tr>\n
\n
Bord de fuite<\/td>\n
Gradation en douceur<\/td>\n
Co\u00fbt plus \u00e9lev\u00e9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Compatibility with LED Drivers<\/h3>\n
LED drivers must support the same phase-cut method.<\/p>\n
Otherwise problems may occur:<\/p>\n
\n
flicker <\/li>\n
limited dimming range <\/li>\n
buzzing <\/li>\n<\/ul>\n
Selecting compatible drivers solves most issues.<\/p>\n
\n
Key Advantages of Using the BQ-TTDIM TRIAC Dimmer<\/h2>\n
Poor dimming performance can ruin lighting quality. Flicker and unstable brightness are common problems.<\/p>\n
The BQ-TTDIM offers smooth dimming, strong compatibility with TRIAC dimmable drivers, simple installation, and reliable operation for many lighting applications.<\/strong><\/p>\n
LED dimmer control brightness<\/figcaption><\/figure>\n
Smooth and Stable Dimming<\/h3>\n
Good dimmers provide gradual brightness changes.<\/p>\n
The BQ-TTDIM allows users to adjust brightness from 0-100% using a rotary knob<\/strong>. <\/p>\n
Smooth dimming improves visual comfort in living and working environments.<\/p>\n
High Compatibility with Global TRIAC Systems<\/h3>\n
Many buildings already use TRIAC dimming infrastructure.<\/p>\n
Typical Applications of TRIAC Dimmers in Lighting Projects<\/h2>\n
Lighting designers often need flexible brightness control. Many building projects still rely on traditional wiring systems.<\/p>\n
TRIAC dimmers are widely used in homes, hotels, retail stores, and architectural lighting because they work with standard AC wiring and require minimal control infrastructure.<\/strong><\/p>\n
Hotels and restaurants rely heavily on dimming.<\/p>\n
Benefits include:<\/p>\n
\n
creating atmosphere <\/li>\n
adjusting brightness for events <\/li>\n
saving energy <\/li>\n<\/ul>\n
\u00c9clairage de d\u00e9tail<\/h3>\n
Retail stores use dimming to highlight products.<\/p>\n
Lighting designers adjust brightness for:<\/p>\n
\n
display shelves <\/li>\n
mannequins <\/li>\n
decorative lighting<\/li>\n<\/ul>\n
\u00c9clairage architectural<\/h3>\n
Architectural projects often require variable lighting intensity.<\/p>\n
Dimmers allow:<\/p>\n
\n
facade lighting control <\/li>\n
feature lighting <\/li>\n
ambient environment tuning<\/li>\n<\/ul>\n
LED Retrofit Projects<\/h3>\n
Many existing buildings still have traditional wiring.<\/p>\n
TRIAC dimmers simplify LED upgrades because:<\/p>\n
\n\n
\n
Avantage<\/th>\n
Explication<\/th>\n<\/tr>\n<\/thead>\n
\n
\n
No new control wires<\/td>\n
Uses existing wiring<\/td>\n<\/tr>\n
\n
Faible co\u00fbt d'installation<\/td>\n
Minimal changes<\/td>\n<\/tr>\n
\n
Fast upgrades<\/td>\n
Replace lamps and drivers<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Because of this, TRIAC dimmers remain very popular in retrofit markets.<\/p>\n
\n
Installation Tips for Stable TRIAC Dimming Performance<\/h2>\n
Even good dimmers can perform poorly if installed incorrectly. Many dimming issues come from wiring or load problems.<\/p>\n
Correct wiring, proper load matching, and compatibility testing are essential to achieve stable TRIAC dimming performance.<\/strong> \n<\/p>\n
Correct Wiring Configuration<\/h3>\n
The BQ-TTDIM connects between the AC mains and the LED driver.<\/p>\n
According to the wiring diagram in the manual, the dimmer receives AC live input and outputs a phase-cut AC signal to the TRIAC LED driver<\/strong>. <\/p>\n
Always ensure connections are secure before powering the system.<\/p>\n
Load Calculation<\/h3>\n
The dimmer supports up to 400W load at 220V<\/strong>.<\/p>\n
However, LED drivers have surge current.<\/p>\n
The manual notes that total surge current must not exceed twice the 65A limit<\/strong>.<\/p>\n
Minimum Load Considerations<\/h3>\n
Some dimmers require minimum load to operate correctly.<\/p>\n
For LED systems:<\/p>\n
\n
avoid extremely small loads <\/li>\n
ensure driver compatibility <\/li>\n<\/ul>\n
Testing the Dimming Range<\/h3>\n
After installation, test brightness levels.<\/p>\n
Check for:<\/p>\n
\n
flicker <\/li>\n
dead zones <\/li>\n
sudden brightness jumps <\/li>\n<\/ul>\n
If problems appear, test different drivers.<\/p>\n
Troubleshooting Common Problems<\/h3>\n
The manual lists simple troubleshooting steps.<\/p>\n
Correct wiring usually solves most installation problems.<\/p>\n
\n
Conclusion<\/h2>\n
The BQ-TTDIM TRIAC dimmer controls brightness by adjusting AC phase conduction using a TRIAC switch, enabling smooth dimming for compatible LED drivers, incandescent lamps, and halogen lighting systems.<\/p>","protected":false},"excerpt":{"rendered":"
Lighting often feels too bright or too dull. Many people want smooth control but struggle with incompatible dimmers and LED drivers. A TRIAC dimmer such as the BQ-TTDIM controls brightness by cutting part of each AC waveform. It uses a TRIAC semiconductor to switch current during each AC cycle, reducing power delivered to the lamp […]<\/p>\n","protected":false},"author":1,"featured_media":6189,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"What Is a TRIAC Dimmer? How BQ-TTDIM Controls LED Brightness Smoothly","_seopress_titles_desc":"Learn how a TRIAC dimmer works and how the BQ-TTDIM controls LED brightness using phase-cut dimming. This guide explains TRIAC dimming principles, leading vs trailing edge methods, LED driver compatibility, installation tips, and why TRIAC dimmers remain popular for residential, commercial, and retrofit lighting projects.","_seopress_robots_index":"","footnotes":""},"categories":[33],"tags":[],"class_list":{"0":"post-6180","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-triac-dimmer"},"_links":{"self":[{"href":"https:\/\/bo-qi.com\/fr\/wp-json\/wp\/v2\/posts\/6180","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bo-qi.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bo-qi.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bo-qi.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bo-qi.com\/fr\/wp-json\/wp\/v2\/comments?post=6180"}],"version-history":[{"count":0,"href":"https:\/\/bo-qi.com\/fr\/wp-json\/wp\/v2\/posts\/6180\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bo-qi.com\/fr\/wp-json\/wp\/v2\/media\/6189"}],"wp:attachment":[{"href":"https:\/\/bo-qi.com\/fr\/wp-json\/wp\/v2\/media?parent=6180"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bo-qi.com\/fr\/wp-json\/wp\/v2\/categories?post=6180"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bo-qi.com\/fr\/wp-json\/wp\/v2\/tags?post=6180"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
![\"triac](\"https:\/\/bo-qi.com\/wp-content\/uploads\/2026\/03\/TRIAC-phase-cut-dimming-waveform.jpg\")
![\"triac](\"https:\/\/bo-qi.com\/wp-content\/uploads\/2026\/03\/TRIAC-phase-cut-installation.jpg\")
![\"rotary](\"https:\/\/bo-qi.com\/wp-content\/uploads\/2026\/03\/Rotary-triac-wall-dimmer-.jpg\")
![\"Forme](\"https:\/\/bo-qi.com\/wp-content\/uploads\/2025\/04\/leading-vs-trailing-edge-dimmer-waveform.jpg\")
![\"leading](\"https:\/\/bo-qi.com\/wp-content\/uploads\/2026\/03\/Leading-Edge-Vs-Trailing-Edge-Dimming.jpg\")
![\"led](\"https:\/\/bo-qi.com\/wp-content\/uploads\/2026\/03\/LED-dimmer-control-brightness.jpg\")
![\"sch\u00e9ma](\"https:\/\/bo-qi.com\/wp-content\/uploads\/2026\/01\/wiring-diagram-for-TRIAC-driver.jpg\")
![\"architectural](\"https:\/\/bo-qi.com\/wp-content\/uploads\/2026\/03\/Architectural-lighting-dimming-control.jpg\")
![\"\"](\"https:\/\/bo-qi.com\/wp-content\/uploads\/2023\/12\/Installation-Guide-Setting-Up-Your-Trailing-Edge-Dimmer-Wiring-Diagram.jpg\")
<\/p>\n