201220947 104橋式整流電路 108直流電源供應器 102 LED 群 106交流電源 五、 本案右有化學式時，請揭示最能顯示發明特徵的化學式· 六、 發明說明： 【發明所屬之技術領域】 本發明係有關於一種發光二極體(LED)驅動方法及電路， 特別是一種以接通一或多個LED群使正弦之不同電壓驅動不 同數目之LED群，以獲得高功率因數之發光二極體驅動方法 及電路。 【先前技術】 當發光二極體(LED)用於照明光源時，使用交流(Α〇或直 流(DC)電源供應較為方便，可使用ι〇〇伏特或更高之電壓驅 動，因而許多LED串接以尚壓驅動。先前技術如授予 等人之美國專利第7,667,237 B2號案教導將兩串LED陣列反 向並聯，而以AC電源驅動。此技術之缺點為正弦波之瞬間電 壓要大於此LED陣列之驅動電麼(0perati〇n v〇itage)才能點亮 其中一串LED陣列。授予Miskin等人之美國專利第7489,〇86 B2號案教導一種LED驅動器，利用AC或Dc電源轉換成高 頻之12伏特AC。此技術需要高頻轉換器及許多電容器，且仍 有Sakai案之缺點。授予Allen等人之美國專利第7,679,292B2 號案教導一種LED燈串，一或多個串聯LED群，每一個以同 一個輸入電麼或整流之父流(全波或半波）輸入電壓驅動，亦 有Sakai案之缺點。 授予Ricardo perez Z之美國專利第4 743 897 B2號案教導一 種LED驅動器，包括產生一定驅動電流之電流源供應多個串 聯LED，及選擇性啟動或切斷某一串LED，但每一次僅一個 2 201220947 LED啟動而其他皆被短路而切斷。 故有一種需求，希望有一種電路能啟動一個或多個LED ’ 使與正弦波之瞬間電壓相同，如此可提高功率因數。 本發明即針對此一需求，提出一種能解決以上缺點之驅動 方法及電路。 【發明内容】 一本發明之目的在提供一種發光二極體驅動方法及電路以 提南供應電源之功率因數。201220947 104 Bridge rectifier circuit 108 DC power supply 102 LED group 106 AC power supply 5. When there is a chemical formula on the right, please disclose the chemical formula that best shows the characteristics of the invention. 6. Description of the invention: [Technical field of the invention] The present invention is A method and circuit for driving a light-emitting diode (LED), in particular, a light-emitting diode driving for driving a different number of LED groups by turning on one or more LED groups to drive different voltages of sinusoids to obtain a high power factor Method and circuit. [Prior Art] When a light-emitting diode (LED) is used for an illumination source, it is convenient to use an alternating current (DC or DC power supply, which can be driven by a voltage of 〇〇V or higher, and thus many LED strings The prior art, as taught in U.S. Patent No. 7,667,237 B2 to the assignee, teaches that two strings of LED arrays are connected in anti-parallel and driven by an AC power source. The disadvantage of this technique is that the instantaneous voltage of the sine wave is greater than this LED. The array of driving power (0perati〇nv〇itage) can illuminate one of the LED arrays. US Patent No. 7489, 〇86 B2 to Miskin et al. teaches an LED driver that converts to a high frequency using an AC or Dc power supply. 12 volt AC. This technique requires a high frequency converter and a number of capacitors, and there are still disadvantages of the Sakai case. U.S. Patent No. 7,679,292 B2 to Allen et al. teaches an LED string, one or more LED groups in series, Each of the same input or the rectified parent (full-wave or half-wave) input voltage drive also has the disadvantages of the Sakai case. U.S. Patent No. 4,743,897 B2 to Ricardo Perez Z teaches an LED drive The device includes a current source that generates a certain driving current to supply a plurality of series LEDs, and selectively activates or cuts off a string of LEDs, but each time only one of the 2 201220947 LEDs is activated and the others are short-circuited and cut off. It is desirable to have a circuit capable of starting one or more LEDs to make the same voltage as the sinusoidal wave, so that the power factor can be improved. The present invention addresses a need for a driving method and circuit that can solve the above disadvantages. Contents] An object of the present invention is to provide a method and circuit for driving a light emitting diode to provide a power factor for supplying power to the south.
本發明之次一目的在提供一種發光二極體驅動方法及電 ’電路中勿需電容||以增加驅動電路之使用壽命。 一種發光二極體驅動方法及電 一種發光二極體驅動方法及電 本發明之另一目的在提供 路’以增加LED之使用壽命。 本發明之又一目的在提供 路’以簡化驅動電路。 發光教導一種 同成或採収時控制而達成，使正弦之不 4 1雜細數，包括： 接⑷咖吏每一母_ 較方便，然而，每一 LEDH=之最间#作電虔〜比 個咖群連接至整流電 南操作電壓勿需相同）；此η 波反轉為正值之正路之輸出為將負半 接至LED群！之輸出而另一/ ’ 關1之-端連 2之一端連接至LED群2之輪之接地；開關 ，其它開關亦以相同手ί連接一；連二至，電路之 之—(且僅-個)導通。當正電_波:電 [S] 3 201220947 =導群ϋ導通而點亮。當正值之正弦波之電 祕:叩⑴幵至vop(1) + v〇p(2)，開關2導 ㈣導通峨亮，其它亦如此進行，#正值之 從乂叩⑴+ 乂叩⑴+…+义^”升至峰值’開關打 LED群導通_亮；過了峰值，電駿峰轉至 二;+ tr關:仍導通’所有咖群導通:點亮;； 麼從 vop ⑴+νορ(2)+.·.+ ν〇ρ(ηΐ)降至 电 開關η-1導通，第一群至第㈣群“導通m 如此進行，直至正值之正㈣嶋72其匕亦 ^it ^ ^^LED ^ ° 1 1 下一個正值之正弦波，即執行相^程序。 偵測電壓值或由定時控制而達成。 汗乍由 ^. ZmLlT^t^irmED) ^ 县山4。控制包括.一串n個led群，每群夕 ϊί ί為> (n)，以串聯相連接;此•二2ί ί ίΐί=; 一個交流電源連接至橋式整流電22 路之輸出八15個議分脑，將橋式整流電 之輸出刀出1/100 ; n個增強〜通道場效 ^h_mentMOSFET)，第一個增強 ^ 接至第-LED群之輪出，笛-伽翻曰體之為極連 極連接至第-lJD 一Ϊ增強&通道場效電晶體之沒 連接；n L其他&通道場效電晶體亦如此 接至柊ϋ^Φ效電晶體之源極經由—個限流電阻連 式整流電“Π J : ί ;=連接至橋 =、差放大器，其正輸入連接至1/100分壓器；[] 201220947 第一個誤差放大器之輸出經由一個限流電阻連接至第二個增 強n_通道場效電晶體之閘極，並接至第一個npN電晶g之^ 極，其負輸入連接至將直流電源供應器之輸出分壓為= 曰段之^ 麗器之第一段’其他誤差放大器亦如此連接。 刀 本發明之第三觀點教導一種發光二極體(LED)驅動電 ί皆時來控制。腳群、交流電源、直流電源供應 相同;一個微控制器’以n個開關經由同步通 電ΐ韓場效電㈣之開或關，微控制雜查由交流 電源轉換來之正值之正弦波電壓之零點，橋式整流 微控制11，直流電源供應器之輸出提供ι …微控制器，η個增強n—通道場效電晶體，第一個择 場效電晶體之洩極連接至第一 LED群之輸出，^ k 通道場，電晶體之洩極連接至第二LED群之輸出τ苴二 η-通道場效電晶體亦如此連接；此n個增強 曰 體之源極經由-個限流電阻連接至橋式整 =端 =強』電觯r:閉極分別連接至微控制器個 號此馳刪根據設定時間發出信 【實施方式】 較佳目=點參相下之參照圖示及 ν0ΡΛ 4^4 ^106 j ^ss# LED群2···群nm此；1個LED群（LED群卜 電路1〇4之輸出為將負半波^整流電路104之輸出，整流 電源r〇2供應電源電壓正弦波；交流 個控制5 11G ’由侧電壓值或由定時 201220947 控制而使η個開關i〇8之一(且僅—初 i之一端連接至LED群i之^出僅而另個)η個開關’開關 ，整流電路H)4之接地；其它開關 ^正弦，電駿G升至、⑴，開關i 接群 通而點焭。畲正值之正弦波之電壓從 ， 關2導通，第-及第二群LED導 0V〇p(2)，開 當正值之正弦波之電壓從v (】=而點冗，其它亦如此進行， 開關η導通，所有LED群^二）···+V*1)升至峰值， 值降至Vu + V 免；過了峰值，電壓從峰A second object of the present invention is to provide a method for driving a light emitting diode and an electric circuit without requiring a capacitor || to increase the service life of the driving circuit. LED light-emitting diode driving method and electricity One light-emitting diode driving method and electricity Another object of the present invention is to provide a path to increase the service life of the LED. Yet another object of the present invention is to provide a way to simplify the drive circuit. Illumination teaches a kind of control when the same or harvesting is achieved, so that the sinus is not 4, the number of subtles, including: (4) curry each mother _ is more convenient, however, each LEDH = the most between the # 虔 虔 ~ It is not necessary to connect the rectifier to the rectification south of the operating voltage; the output of the positive path with the η wave inverted to a positive value is to connect the negative half to the LED group! The output and the other / 'off 1' - one end of the end 2 is connected to the ground of the wheel of the LED group 2; the switch, the other switch is also connected with the same hand ί; even two, the circuit - (and only - ). When positive electricity_wave: electricity [S] 3 201220947 = The group is turned on and lit. When the positive value of the sine wave is secret: 叩(1)幵 to vop(1) + v〇p(2), switch 2 (4) turns on, the other is also done, #正值的乂叩(1)+ 乂叩(1)+...+义^"rises to the peak' switch to turn on the LED group conduction_bright; after the peak, the electric peak turns to two; + tr off: still turns on 'all cafés turn on: light up;; from vop (1) +νορ(2)+.·.+ ν〇ρ(ηΐ) falls to the electrical switch η-1 conduction, the first group to the (fourth) group "conducting m" is performed until the positive value is positive (four) 嶋72 and then ^ It ^ ^^LED ^ ° 1 1 The next positive sine wave, the execution phase ^ program. The detection voltage value is achieved by timing control. Sweat by ^. ZmLlT^t^irmED) ^ County Hill 4. Control consists of a string of n led groups, each group ϊ ϊ ί ̄ ̄ (n), connected in series; this • 2 2 ί ί ίΐί=; an AC power supply connected to the bridge rectifier 22 output 8 15 A sub-brain, the output of the bridge rectifier is 1/100; n enhancements ~ channel field effect ^h_mentMOSFET), the first enhancement ^ is connected to the -LED group, the flute-gamma The connection of the poles to the -lJD one-way enhancement & channel field effect transistor is not connected; the n L other & channel field effect transistor is also connected to the source of the Φ^Φ effect transistor via - Current limiting resistors connected to the rectifier "Π J : ί ; = connected to the bridge =, differential amplifier, its positive input is connected to the 1 / 100 voltage divider; [] 201220947 The output of the first error amplifier via a current limiting resistor Connected to the gate of the second enhanced n_channel field effect transistor, connected to the first npN transistor g, and its negative input is connected to divide the output of the DC power supply to = 曰^ The first section of the instrument, 'Other error amplifiers are also connected as such. The third aspect of the invention teaches a light-emitting diode (LED) driving power ί All the time to control. Foot group, AC power, DC power supply is the same; a microcontroller 'n switches through the synchronous power-on ΐ Han field power (four) on or off, micro-control miscellaneous investigation is converted from AC power The zero value of the sine wave voltage, the bridge rectifier micro control 11, the output of the DC power supply provides the ι ... microcontroller, n enhanced n-channel field effect transistors, the first MOSFET of the field effect transistor Connected to the output of the first LED group, the channel field of the ^k, the drain of the transistor is connected to the output of the second LED group, and the η-channel field effect transistor is also connected; the source of the n enhanced corpuscles Connected to the bridge type via a current limiting resistor = terminal = strong 觯 r: the closed pole is respectively connected to the microcontroller number. This chiseling sends a letter according to the set time. [Embodiment] Better order = point under phase Reference figure and ν0ΡΛ 4^4 ^106 j ^ss# LED group 2··· group nm; one LED group (the output of the LED group circuit 1〇4 is the output of the negative half-wave rectifier circuit 104) , Rectifier power supply r〇2 supply power supply voltage sine wave; AC control 5 11G 'by side voltage value or by At the time of 201220947, one of the n switches i〇8 is controlled (and only one end of the first i is connected to the LED group i and only the other one) n switches 'switches, the ground of the rectifier circuit H)4; other switches ^Sinusoidal, electric Jun G rises to, (1), switch i connects to group pass and clicks. The positive sine wave voltage is turned on, off 2, the first and second group LED leads 0V〇p(2), on When the voltage of the positive sine wave is from v (] = and the point is redundant, the other is also done, the switch η is turned on, all the LED groups ^ 2)····+V*1) rise to the peak value, and the value falls to Vu + V Exempted; over peak, voltage from peak
群導通而^ ; Hi ν °Ρ(Π'η’開關η仍導通’所有LED + v〇p(2)+l"v ^ )fn^p(1\+I〇p(2)i^iV〇p(n-v^v〇p^ v導=r=r直至 壓v達降下：第值 發明顯示於第2圖’第2 _顯示依據本 發f ?貞電壓值來控制之LED驅動電路。η個LED群202 以^相連接，在此實施例，n等於5，咖 橋式整㈣路2〇4之輸出，輸入為腑交流電Group conduction and ^ ; Hi ν °Ρ(Π'η' switch η is still conducting 'all LEDs + v〇p(2)+l"v ^ )fn^p(1\+I〇p(2)i^iV 〇p(nv^v〇p^ vguide=r=r until the pressure v is lowered: the first value is shown in Fig. 2 '2' shows the LED drive circuit controlled according to the voltage value of the present invention. The LED groups 202 are connected by ^, in this embodiment, n is equal to 5, the output of the bridge type (four) way 2〇4, the input is 腑 alternating current
^器R3 if ί供應器2〇8提供12V之偏壓給電路，益由分 及 ”v ㈣將之分為 〇.45V(假設為 V〇p/100)，0.70V，〇.98V i ϋ 誤差放大器m至U4之負輸入’另一個分屋 η 電壓分出1/100提供給誤差放大器υι至 之輸入’ 12V之偏壓亦經由一個限流電阻脱連接至增 T91場效電晶體Q1之閉極，並連接至第一個刪電晶體 尽描:玉。ί差放大器U1之輸出經由一個限流電阻RG2連接 、击』11還道場效電晶體Q2之閑極，並經由一個限流電阻册2 iii刪電晶體T2之基極，㈣電晶體T2之射極接地； 二差放大器U2之輸出經由一個限流電阻RG3連接至增強η-通_ 、場效電晶體Q3之閘極，誤差放大器U2之輸出亦經由一個 6 201220947 限流電阻肋3連接至NpN雷曰 之集極連接至增強n、g ^曰曰體T3之基極，WN電晶體T3 地；誤差放大器13 電晶㈣之間極，而射極接 η-通道場效電晶接至增強 T4之集極連接至增強 曰m’ f N電晶體 η-通道場效f晶體Q5 由—個贿做連接至增強 個限極’誤差放大㈣4之輸出亦經由一 二之f連接至增強㈣道場效電晶體 =qi轉嫌分m L流電阻通道場效f晶體Q1至Q5之源極經 由限机電阻RS1至RS5連接至橋式整流電路1〇4之接地端。 幹出電源2〇6導通，橋式整流電路204之 ^US &通道場效電晶⑽之祕電壓tv 至接地端，LED群a點亮，但誤差放大it m 32V之1/1=而低於負輸入之〇 45V，奶之輸出為低壓⑹而增 強η-通道場效電晶體Q2為〇FF，q3至Q5亦然。當正 ^ 波，電壓為32_蕭時，誤差放大器m之正輸人為观之二 而尚於負輸入之0.45V’U1之輸出為高屢(H)，而增強 場效電晶體Q2及NPN電晶體T2為⑽，增強n_通道場效電= 體Q1之閘極接地’增強η-通道場效電晶體Q1之閘極電壓亦噯 由導通之增強η-通道場效電晶體q2而接地，因此Q1為〇ff， 串接之LED群A及B之輸出端經由q2及限流電阻RS2連接 至接地端，LED群A及B點亮。當正值之正弦波之電壓為 50-68V時，增強η-通道場效電晶體Q1、q2、Q4及〇 ‘， Q3為0N’故LED群A、；8及0點亮，以下類推近0[弦· 波之峰值時，所有LED群皆點亮，過了峰值，以相反之程序 7 201220947 替代，直至零電壓，再重複以上之程序。 本發明之另一較佳實施例顯示於第3圖第3圖係顯示依 據本發明以定時㈣來控狀LED驅動電路…個微控制器 310用以經由同步線路3〇2控制增強〜通道場效電晶體卬至 Q5之ON/OFF，微控制ϋ檢查由交流電轉換來之正值之正 弦波電壓之零點，LED群202、橋式整流電路204、交流電源 206 ^直流電源供應器208皆與第2圖相同。直流電源供應器 208長：供12V之偏壓Vcc給微控制器31〇，橋式整流電路204 之輸出提供同步信號給微控制器31〇。 鲁運作時，110V交流電源206導通，橋式整流電路2〇4之 輸出為負半波反轉為正半波之正值正弦波。當正值之正弦波相 位在0-30度時，微控制器31〇使S1為高壓(H)，增強n_通道 場效電晶體Q1為ON而LED群A點亮。當正值之正弦波相 位在30-45度時，微控制器210使S2為高壓田），增強n通道 場效電晶體Q2為ON而LED群A及B點亮。當正值之正弦 波相位在45-60度時，微控制器210使S3為高壓⑻，增強〜 通道場效電晶體Q3為ON而LED群A、B及C點亮。^理， 當正值之正弦波相位在60-75度時，LED群A、B、C及D點 亮。當正值之正弦波相位進入75_9〇度時，所有LED群皆點 擊亮。過了 90度，以相反之程序替代，直至18〇度，再重複以 上之程序。 父流電源為220V時，LED群、增強η-通道場效電晶體及 誤差放大器皆加倍。若led群之最高操作電壓(rating operati(m voltage) Vop改變’電壓及相位之變換應隨LED群之最高操作電 壓而改變。 ' 第4圖係顯示依據本發明實驗結果之輸入正弦波電壓及 正弦波電流。輸入電壓401為正弦波而輸入端之輸出電流‘ο〗 為有漣波之正弦波，功率因數高至0.9800。 201220947 述本财補之觀，鱗魏更加清楚描 來對本發明之“二而制並=述； 種改變及具相等性的安排於本:：欲望範：从 【圖式簡單說明】 ^圖係顯示依據本發日月以偵測電壓值來控制之led驅動方 ^圖係顯示爾本發似翻電舰來㈣之LED驅動電^R3 if ίSupply 2〇8 provides a bias voltage of 12V to the circuit, and it is divided into "v (4) and divided into 45.45V (assumed to be V〇p/100), 0.70V, 〇.98V i ϋ The negative input of the error amplifiers m to U4 'the other divided room η voltage is divided by 1/100 and supplied to the error amplifier υι to the input '12V bias voltage is also disconnected to the T91 field effect transistor Q1 via a current limiting resistor. Closed, and connected to the first cut-off transistor: Jade. The output of the differential amplifier U1 is connected via a current limiting resistor RG2, and the idle pole of the field-effect transistor Q2 is passed through a current limiting resistor. Book 2 iii delete the base of the transistor T2, (4) the emitter of the transistor T2 is grounded; the output of the difference amplifier U2 is connected to the gate of the enhanced η-pass_, field effect transistor Q3 via a current limiting resistor RG3, error The output of amplifier U2 is also connected via a 6 201220947 current limiting resistor rib 3 to the collector of the NpN thunder to the base of the enhancement n, g ^ body T3, WN transistor T3 ground; error amplifier 13 electro-crystal (4) The interpole, and the emitter connected to the η-channel field effect transistor to the collector of the enhanced T4 is connected to the enhanced 曰m' f N transistor η - Channel field effect f crystal Q5 is connected by a bribe to an enhanced limit pole error amplification (4) 4 output is also connected to the enhanced (four) field effect transistor = qi to the sub-m flow resistance channel field effect The sources of the f crystals Q1 to Q5 are connected to the ground terminal of the bridge rectifier circuit 1〇4 via the limit resistors RS1 to RS5. The dry power source 2〇6 is turned on, and the bridge rectifier circuit 204 is connected to the ^US & channel field effect power. The secret voltage tv of the crystal (10) to the ground terminal, the LED group a is lit, but the error amplification is 1/1= of the m 32V and lower than the negative input of 45V, the output of the milk is the low voltage (6) and the η-channel field effect is enhanced. The crystal Q2 is 〇FF, and q3 to Q5 are also the same. When the voltage is 32_xiao, the error amplifier m is the positive input and the negative input is 0.45V'U1. H), and enhance the field effect transistor Q2 and NPN transistor T2 is (10), enhance the n_channel field effect = body Q1 gate grounding 'enhanced η-channel field effect transistor Q1 gate voltage is also turned on The η-channel field effect transistor q2 is reinforced and grounded, so Q1 is 〇ff, and the output terminals of the cascaded LED groups A and B are connected to the ground via q2 and the current limiting resistor RS2. The LED groups A and B are lit. When the voltage of the positive sine wave is 50-68V, the η-channel field effect transistors Q1, q2, Q4 and 〇' are enhanced, and Q3 is 0N', so the LED group A, 8 And 0 is lit, the following analogy is near 0 [string·wave peak, all LED groups are lit, over peak, replaced by the opposite procedure 7 201220947, until zero voltage, and then repeat the above procedure. A preferred embodiment is shown in FIG. 3 and FIG. 3 is a diagram showing a timing (four) control LED driving circuit in accordance with the present invention. A microcontroller 310 is used to control the enhancement of the ~channel field effect transistor via the synchronous line 3〇2. To ON/OFF of Q5, the micro-control ϋ checks the zero point of the positive sine wave voltage converted by the alternating current, and the LED group 202, the bridge rectifier circuit 204, the AC power source 206, and the DC power supply 208 are the same as in FIG. . The DC power supply 208 is long: a bias voltage Vcc for 12V is applied to the microcontroller 31, and the output of the bridge rectifier circuit 204 provides a synchronization signal to the microcontroller 31. When Lu operates, the 110V AC power supply 206 is turned on, and the output of the bridge rectifier circuit 2〇4 is a positive half-wave reversal to a positive half-wave positive sine wave. When the positive sine wave phase is at 0-30 degrees, the microcontroller 31 causes S1 to be high voltage (H), and enhances the n_channel field effect transistor Q1 to be ON and the LED group A to illuminate. When the positive sine wave phase is at 30-45 degrees, the microcontroller 210 makes S2 a high voltage field, and the enhanced n-channel field effect transistor Q2 is ON and the LED groups A and B are lit. When the positive sine wave phase is between 45 and 60 degrees, the microcontroller 210 causes S3 to be high voltage (8), the enhancement ~ channel field effect transistor Q3 is ON and the LED groups A, B and C are illuminated. ^理, When the positive sine wave phase is 60-75 degrees, the LED groups A, B, C and D are bright. When the positive sine wave phase enters 75_9 degrees, all LED groups are lit. After 90 degrees, replace it with the opposite procedure, up to 18 degrees, and repeat the above procedure. When the parent current supply is 220V, the LED group, the enhanced η-channel field effect transistor, and the error amplifier are doubled. If the highest operating voltage of the led group (rating operating voltage (m voltage) Vop changes 'voltage and phase change should be changed with the highest operating voltage of the LED group. ' Figure 4 shows the input sine wave voltage according to the experimental results of the present invention and Sine wave current. The input voltage 401 is a sine wave and the output current of the input terminal is 'ο〗 is a sine wave with chopping, the power factor is as high as 0.9800. 201220947 The concept of the financial supplement, the scale Wei is more clearly described for the present invention "Two systems and = description; kinds of changes and equal arrangements in this:: Desire Fan: From [Simple Description] ^ The system shows the LED driver controlled by the detected voltage value according to the date of the release. ^The picture shows that the hair is like a reversible ship (four) LED drive
第3圖係顯示依據本發_定時控制來控制之㈣驅動電路。 Ϊ電4>Γ係顯示猶本發㈣驗絲讀人球波電壓及正弦Fig. 3 shows the (four) driving circuit controlled in accordance with the present invention. Ϊ电4> Γ 显示 犹 犹 犹 ( 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四
【主要元件符號說明】 102 LED 群 106交流電源 110控制器 204橋式整流電路 208直流電源供應器 310微控制器 4〇2輸出電流 104橋式整流電路 108直流電源供應器 202 LED 群 206交流電源 302 同步線路 401輸入電壓[Main component symbol description] 102 LED group 106 AC power supply 110 controller 204 bridge rectifier circuit 208 DC power supply 310 microcontroller 4〇2 output current 104 bridge rectifier circuit 108 DC power supply 202 LED group 206 AC power supply 302 synchronous line 401 input voltage