Yuannengji Since LED chips have low power and low operating voltage, a large number of series and parallel connections must be used in the production of lamps to meet the power requirements. How to connect these chips is an issue we must take seriously. Otherwise, the service life of the lamp will be greatly shortened, resulting in the embarrassing situation of “saving energy but not saving money”.
As an electronic component, LED has a very special side, which is nonlinearity. Simply put, as long as the voltage applied to the LED changes a little, it will cause a large change in the chip current. If not handled properly, it will seriously affect the life of the LED. Here are the advantages and disadvantages of various connection methods of LED chips:
1. Series connection
Series connection is the most reasonable connection method for LED chips
The basic feature of the series circuit is that the current on all LED chips is equal, so the power difference between each chip is equal to their voltage difference, and will not be higher than it. Dá bhrí sin, the series connection method has the strongest tolerance for the inconsistency of LED chips.
The only disadvantage of the series circuit is that once the chip is open, the entire lamp or the entire string of lights will not light up, and the short circuit has basically no effect. Mar sin féin, the proportion of open circuits in chip failures is lower than that of short circuits. Dá bhrí sin, the overall failure rate of series circuits is very low.
If you want to be foolproof, you can connect a 4v~5v voltage regulator in parallel to each chip to provide a path when the chip is open, but the cost will be slightly higher. Mar sin féin, it is worth it for some special occasions with high requirements.
2. Parallel connection
Parallel connection is one of the most uncertain connection methods for sliseanna stiúir, which will amplify the consequences of LED inconsistency and cause premature damage to the lamps. If you are not sure whether you can purchase chips with highly consistent vF values, do not use parallel connection.
Now take 3.0ⅴ and 3.6ⅴ chips as an example. Their average vF value after parallel connection will be higher than 3.0, resulting in excessive current of 3.0ⅴ LED. As the temperature rises, vF will further decrease and power consumption will continue to increase. Giorróidh timthriall fí den sórt sin go mór saol na sliseanna ar luach íseal vF sa ghrúpa comhthreomhar.
Má tá locht gearrchiorcad ag an sliseanna seo, ní bheidh an grúpa iomlán sliseanna solas suas. Má tá sruth aschuir an tsoláthair chumhachta mór, déanfaidh sé an sliseanna seo a dhó go tapa i gciorcad gearr, agus ansin an sruth ba chóir a bhaineann leis a dháileadh ar dhaoine eile, rud a luathaíonn luas aosaithe an ghrúpa sceallóga seo.
3. Parallel first, then series connection
Parallel first, ansin léiríonn nasc sraith na buntáistí a bhaineann le nasc sraithe, ach ní féidir leis na míbhuntáistí a bhaineann le nasc comhthreomhar a sheachaint, mar sin ní hé an modh ceangail is fearr é. Mar sin féin, is é an modh seo is coitianta a úsáidtear i lampaí fluaraiseacha. Mar shampla, 18w tá lampaí fluaraiseacha go bunúsach 4 comhthreomhar agus 24 sraith.
Tá an modh nasctha seo bunaithe ar an mbonn go bhfuil sliseanna oscailte uair amháin, is féidir le sliseanna eile leanúint ar aghaidh ag lasadh suas. Ar an dromchla, is beag tionchar atá aige, ach luasóidh sé ráta damáiste na sliseanna atá fágtha. Ar ndóigh, má cheannaítear sliseanna i gcainníochtaí móra, is féidir na sliseanna a rangú níos míne agus comhsheasmhacht na sliseanna a chinntiú níos fearr, atá mar bhunús leis an modh nasctha seo a ghlacadh freisin.
4. Series connection first, then parallel connection
Nasc sraitheach ar dtús, ansin déanann nasc comhthreomhar buntáistí an dá mhodh a ionsú agus is modh nasctha LED níos réasúnta é.
Go háirithe do roinnt gnólachtaí beaga i bhfoirm ceardlanna baile, tá sé deacair comhsheasmhacht na sliseanna a chinntiú, mar sin déan iarracht an modh seo a ghlacadh chun saol seirbhíse na lampaí a uasmhéadú. Dall aithris a dhéanamh ar an nasc comhthreomhar mar a thugtar air ar dtús, ansin ní oibreoidh modh nasc sraith monarchana móra.
Tugann an méid thuas isteach go hachomair na buntáistí agus na míbhuntáistí a bhaineann le sraith sliseanna stiúir éagsúla agus modhanna nasc comhthreomhar. I mo thaithí phearsanta, nuair a dhearadh plátaí bonn alúmanaim do lampaí, ba cheart tosaíocht a thabhairt do nasc sraithe, ina dhiaidh sin nasc sraithe ar dtús agus ansin nasc comhthreomhar, agus nasc comhthreomhar ar dtús agus ansin ba cheart nasc sraithe a sheachaint oiread agus is féidir. Maidir leis an modh íseal-voltais de gach nasc comhthreomhar, má cheadaíonn coinníollacha, is fearr modúl treisithe DC-DC a úsáid chun athrú go nasc sraithe.