201129227 六、發明說明： 【發明所屬之技術領威】 [_本發明涉及4驅動電路，特別係指"種發光二極體燈 具的驅.動電路° 【先前技彳标】 [0002] 目前，大功率發光二極體（LEI>)憑藉其節能、環保、高 效等特點，已被應用到越來越多的領域當中，如普通照 明燈、路燈、水底燈、頂燈、舞臺燈等等。由於led的電 氣特性是它的光輸出是和驅動電流成正比的，所以對驅 〇201129227 VI. Description of the invention: [Technical leadership of the invention] [_ The invention relates to a 4-drive circuit, in particular to a drive circuit of a light-emitting diode lamp. [Previous technical standard] [0002] High-power LEDs (LEI>) have been applied to more and more fields due to their energy saving, environmental protection and high efficiency, such as general lighting, street lighting, underwater lights, ceiling lights, stage lights and so on. Since the electrical characteristic of LED is that its light output is proportional to the driving current, it is driven by
動電源的定性要求是較高的。若LED在非恒定電流下工作 ，會導致發光不穩定’照明效果不佳，容易降低其使用 壽命和損壞LED。因此，目前一般採用恒流源直接對LED 燈具進行供電。然而，該恒流源接受外部輪入的PWM信號 ..... 的頻率通常為1 OKHz (千赫茲）到500KHz之間，從而持 續輸出恒定大小的電流至LED燈具，使得LED燈具中的 LED處於恒定發光的狀態’如此不种於節省電能。 Q 【發明内容】 [0003] 有鑒於此，有必要提供一種可節能的發光二極體燈具的 驅動電路。 [0004] —種發光二極體燈具的驅動電路，包括連接至發光二極 體燈具的一穩壓電路’該發光二極體燈具包括至少一由 複數發光二極體串聯而成的發光二極體燈串，該驅動電 路還包括一控制電路，該控制電路包括一微控制器及連 接於該至少一發光二極體燈串和微控制器之間的至少一 場效應晶體管，該微控制器通過檢測流經該至少一發光 099102968 表單編號A0101 第5頁/共16頁 0992005632-0 201129227 二極體燈串的電流的大小，從而輪出一頻率大於6 0Hz的 PWM信號至該至少一場效應晶體管，控制該至少一場效應 晶體管反復於導通/截止之間切換，進而控制該至少一發 光二極體燈串的閃爍頻率在60Hz以上。 [0005] [0006] [0007] 與習知技術相比，該發光二極體燈具驅動電路通過微控 制器檢測流經發光二極體燈串的電流大小，輸出頻率大 於60Hz的PWM信號至場效應晶體管，調整該場效應晶體管 的内阻的大小而實現恒流，並通過該場效應晶體管在PWM 信號的控制下反復於導通/截止之間切換而控制該發光二 極體燈串中的發光二極體不斷於點亮/熄滅之間切換而閃 爍，使其閃爍頻率在60Hz以上，從而達到在人的視覺不 能感測到燈閃爍的情況下達到節能的目的。 【實施方式】 以下參照附圖，對本發明發光二極體燈具的驅動電路予 以進一步說明。 請參閱圖1，為本發明一實施例中發光二極體（LED)燈 具的驅動電路的電路示意圖，其包括一交流電源2〇、一 帶有PFC (功率因素校正）及ρ^μ (脈衝寬度調製）功能 的恒壓電路30、一連接於該恒壓電路30的輸出可調的穩 壓電路40和一調壓電路50、以及一控制電路6〇〇該穩壓 電路40連接至一LED燈具70。該控制電路60連接於調壓 電路50和LED燈具70之間。該LED燈具70包括相互並聯連 接的第一 LED燈串71、第二LED燈串72和第三LED燈串73 ’每一LED燈串71、72、73包括串聯連接的複數LED74。 099102968 該控制電路60包括一微控制器（MCU) 68 表單編號A0101 第6頁/共16頁 分別連接於第 0992005632-0 [0008] 201129227 一、第二、第三LED燈串71、72、73與微控制器68之間 的第一、第二、第三場效應晶體管Ql、Q2、Q3及複數電 阻。所述場效應晶體管Ql、Q2、Q3均為N溝道增強型場效 應晶體管（NM0S)，所述第一、第二、第三場效應晶體 管Ql、Q2、Q3的漏極分別與第一、第二、第三LED燈串 71、72、73的負極連接，並於所述場效應晶體管Ql、Q2 、Q3的漏極和第一、第二、第三LED燈串71、72、73之 間分別形成第一結點61、第二結點62和第三結點63。該 微控制器68包括一電源端VCC、一回饋端FB、一接地端 GND、分別與第一、第二、第三場效應晶體管Ql、Q2、 Q3的閘極連接的第一、第二、第三控制端Gl、G2、G3、 分別與第一、第二、第三場效應晶體管Ql、Q2、Q3的源 極連接的第一、第二、第三比較端SI、S2、S3及第一、 第二、第三輸入端Dl、D2、D3。所述第一、第二、第三 控制端Gl、G2、G3分別輸出頻率在60Hz (赫茲）以上且 在500Hz以下的PWM信號。所述微控制器68的内部設有一 基準電壓值，並通過將第一、第二、第三比較端SI、S2 、S3上的電壓大小分別與内部的基準電壓值進行比較，The qualitative requirements for power supplies are higher. If the LED is operated at a non-constant current, it will cause unstable illumination. The lighting effect is not good, and it is easy to reduce its service life and damage the LED. Therefore, currently, a constant current source is generally used to directly supply power to an LED lamp. However, the constant current source accepts an externally-incorporated PWM signal..... The frequency is usually between 1 OKHz (kilohertz) and 500KHz, thereby continuously outputting a constant current to the LED luminaire, so that the LED in the LED luminaire In a state of constant illumination - this is not so conducive to saving energy. Q [Summary of the Invention] [0003] In view of the above, it is necessary to provide an energy-saving driving circuit for a light-emitting diode lamp. [0004] A driving circuit for a light-emitting diode lamp, comprising a voltage stabilizing circuit connected to the light-emitting diode lamp. The light-emitting diode lamp comprises at least one light-emitting diode formed by connecting a plurality of light-emitting diodes in series a driving circuit, the driving circuit further comprising a control circuit, the control circuit comprising a microcontroller and at least one field effect transistor connected between the at least one LED string and the microcontroller, the microcontroller passing Detecting the magnitude of the current flowing through the at least one illumination 099102968 Form No. A0101, page 5 / page 16 0992005632-0 201129227 diode string, thereby rotating a PWM signal having a frequency greater than 60 Hz to the at least one field effect transistor, Controlling the at least one field effect transistor to repeatedly switch between on/off, thereby controlling the blinking frequency of the at least one light emitting diode string to be above 60 Hz. [0007] [0007] Compared with the prior art, the LED driving circuit of the LED detects the current flowing through the LED string through the microcontroller, and outputs a PWM signal with a frequency greater than 60 Hz to the field. The effect transistor adjusts the internal resistance of the field effect transistor to achieve a constant current, and controls the light emission in the light emitting diode string by repeatedly switching between on/off under the control of the PWM signal. The diode is continuously switched between blinking and extinguishing, and the flickering frequency is above 60 Hz, so as to achieve energy saving in the case where human vision cannot sense the flicker of the lamp. [Embodiment] Hereinafter, a drive circuit of a light-emitting diode lamp of the present invention will be further described with reference to the accompanying drawings. 1 is a circuit diagram of a driving circuit of a light-emitting diode (LED) lamp according to an embodiment of the present invention, which includes an AC power supply 2〇, a PFC (power factor correction), and ρ^μ (pulse width). a constant voltage circuit 30 for modulating the function, an output adjustable voltage regulator circuit 40 connected to the constant voltage circuit 30, a voltage regulating circuit 50, and a control circuit 6 connected to the voltage stabilizing circuit 40 LED luminaire 70. The control circuit 60 is connected between the voltage regulating circuit 50 and the LED lamp 70. The LED lamp 70 includes a first LED string 71, a second LED string 72, and a third LED string 73' connected in parallel with each other. Each LED string 71, 72, 73 includes a plurality of LEDs 74 connected in series. 099102968 The control circuit 60 includes a microcontroller (MCU) 68 Form No. A0101 Page 6 / Total 16 pages are respectively connected to 0992005632-0 [0008] 201129227 First, second, third LED string 71, 72, 73 First, second, and third field effect transistors Q1, Q2, Q3 and a plurality of resistors are coupled to the microcontroller 68. The field effect transistors Q1, Q2, and Q3 are all N-channel enhancement type field effect transistors (NMOS), and the drains of the first, second, and third field effect transistors Q1, Q2, and Q3 are respectively associated with the first The cathodes of the second and third LED strings 71, 72, 73 are connected to the drains of the field effect transistors Q1, Q2, Q3 and the first, second, and third LED strings 71, 72, 73. The first node 61, the second node 62, and the third node 63 are formed separately. The microcontroller 68 includes a power terminal VCC, a feedback terminal FB, a ground terminal GND, and first and second terminals respectively connected to the gates of the first, second, and third field effect transistors Q1, Q2, and Q3. The third control terminals G1, G2, G3, the first, second, and third comparison terminals SI, S2, S3, and the third terminals respectively connected to the sources of the first, second, and third field effect transistors Q1, Q2, and Q3 1. Second and third input terminals D1, D2, D3. The first, second, and third control terminals G1, G2, and G3 respectively output PWM signals having a frequency of 60 Hz (hertz) or more and 500 Hz or less. The microcontroller 68 is internally provided with a reference voltage value, and compares the voltage levels on the first, second, and third comparison terminals SI, S2, and S3 with the internal reference voltage values, respectively.
根據比較的結果確定各控制端Gl、G2、G3所輸出的PWM 信號的頻率。所述第一、第二、第三場效應晶體管Q1、 、 Q2、Q3的源極與第一、第二、第三比較端SI、S2、S3之 間分別形成第四結點64、第五結點65和第六結點66。所 述電阻包括分別連接於第一、第二、第三結點61、62、 63與第一、第二、第三輸入端Dl、D2、D3之間的第一、 第二、第三限流電阻Rl、R2、R3及分別連接於第四、第 五、第六結點6 4、6 5、6 6與地極之間的第四、第五、第 099102968 表單編號A0101 第7頁/共16頁 0992005632-0 201129227 /、檢測電阻R4、r5、R6。所述限流電阻R1、R2、r3均為 阻值很大的電阻，以使得第―、第二、第三輪入端μ、 D2、D3呈高阻態。本實施例中，所述限流電阻^、R2、 R3的阻值為10兆歐。該微控制器68的電源端vcc和接地 端GND均與調壓電路50連接，通過調壓電路5〇將恒壓電路 3〇的輸出電壓轉換成微控制器68的工作電壓，使得微控 制器68可以在恒壓電路3〇供電下正常工作。該回饋端fb 與穩壓電路40連接。 [0009] 工作時，恒壓電路30在交流電源20供電的情況下，將交 流電壓20轉換成恒定直流電壓並分別輸出至調壓電路5〇 和穩壓電路40。調壓電路50將恒壓電路30的輸出電壓轉 換成微控制器68的工作電壓，使得微控制器68在正常供 電的情況下工作。穩壓電路40根據負載.的大小，即led燈 具70的LED燈串71、72、73中LED74的數量而輸出穩定 大小的電壓至第一、第二、第三LED燈串71、72、73。 該微控制器68檢測流經各LED燈串71、72、73中電流的 大小，並通過回饋端FB輸出回饋信號至穩壓電路4〇，由 於維持流經每一LED燈串71、72、73中電流為同一設定 的恒定電流值的前提下，各LED燈串71、72、73兩端的 電壓值仍然會有差異，因此’通過微控制器68的檢測和 回饋功能而調整使得穩壓電路40穩定輸出的電壓不小於 各LED燈串71、72、73正常工作時兩端電壓值最大的LED 燈串的電壓值。同時’在穩壓電路4〇輸出穩定的電壓的 前提下，該微控制器68通過檢測流經各LED燈串71、72 、73中電流的大小，當檢測到流經某LED燈串71、72、 099102968 表單編號A0101 第8頁/共16頁 0992005632-0 201129227 73中電流的大小的大於或者小於特定值時，微控制器68 的控制端Gl、G2、G3輸出一特定頻率的PWM信號至與該 LED燈串71、72、73對應連接的場效應晶體管Ql、Q2、 Q3，通過該特定頻率的PWM信號而控制對應的場效應晶體 管Ql、Q2、Q3的内阻而改變對應的場效應晶體管Ql、Q2 、Q3上的壓降，從而達到調整流經該LED燈串71、72、 Ο [0010] 73'中的電流大小，實現恒流的目的，同時通過不同頻率 的PWM信號改變LED燈串71、72、73中LED74的閃爍頻率 ，達到在人的視覺不能感測到燈閃爍的情況下達到節能 的目的。The frequency of the PWM signal output by each of the control terminals G1, G2, and G3 is determined based on the result of the comparison. Forming a fourth node 64 and a fifth between the sources of the first, second, and third field effect transistors Q1, Q2, and Q3 and the first, second, and third comparison terminals S1, S2, and S3, respectively. Node 65 and sixth node 66. The resistor includes first, second, and third limits respectively connected between the first, second, and third nodes 61, 62, 63 and the first, second, and third input terminals D1, D2, and D3. Current resistors R1, R2, R3 and fourth, fifth, and 099102968 connected to the fourth, fifth, and sixth nodes 6 4, 6 5, and 6 6 and the ground respectively, Form No. A0101, page 7 / A total of 16 pages 0992005632-0 201129227 /, detection resistors R4, r5, R6. The current limiting resistors R1, R2, and r3 are resistors having a large resistance so that the first, second, and third wheel terminals μ, D2, and D3 are in a high impedance state. In this embodiment, the current limiting resistors ^, R2, and R3 have a resistance of 10 megohms. The power supply terminal vcc and the ground terminal GND of the microcontroller 68 are both connected to the voltage regulating circuit 50, and the output voltage of the constant voltage circuit 3〇 is converted into the operating voltage of the microcontroller 68 through the voltage regulating circuit 5〇, so that the micro control The device 68 can operate normally under the power supply of the constant voltage circuit 3 . The feedback terminal fb is connected to the voltage stabilizing circuit 40. [0009] In operation, the constant voltage circuit 30 converts the AC voltage 20 into a constant DC voltage in the case of supplying power from the AC power source 20, and outputs it to the voltage regulating circuit 5A and the voltage stabilizing circuit 40, respectively. The voltage regulating circuit 50 converts the output voltage of the constant voltage circuit 30 to the operating voltage of the microcontroller 68, so that the microcontroller 68 operates under normal power supply. The voltage stabilizing circuit 40 outputs a voltage of a stable magnitude to the first, second, and third LED light strings 71, 72, 73 according to the magnitude of the load, that is, the number of LEDs 74 in the LED light strings 71, 72, 73 of the LED lamp 70. . The microcontroller 68 detects the magnitude of the current flowing through each of the LED strings 71, 72, 73, and outputs a feedback signal to the voltage stabilizing circuit 4 through the feedback terminal FB, as it flows through each of the LED strings 71, 72, Under the premise that the current in 73 is the same set constant current value, the voltage values across the LED strings 71, 72, 73 will still differ, so 'the voltage regulator circuit is adjusted by the detection and feedback function of the microcontroller 68. The voltage of the stable output of 40 is not less than the voltage value of the LED string having the largest voltage value at both ends of each LED string 71, 72, 73 during normal operation. At the same time, on the premise that the voltage stabilizing circuit 4 outputs a stable voltage, the microcontroller 68 detects the current flowing through each of the LED strings 71, 72, 73, and detects that it flows through an LED string 71, 72, 099102968 Form No. A0101 Page 8 / Total 16 Page 0992005632-0 201129227 When the magnitude of the current in 73 is greater than or less than a certain value, the control terminals G1, G2, G3 of the microcontroller 68 output a PWM signal of a specific frequency to The field effect transistors Q1, Q2, and Q3 connected to the LED lamp strings 71, 72, and 73 control the internal resistance of the corresponding field effect transistors Q1, Q2, and Q3 by the PWM signal of the specific frequency to change the corresponding field effect. The voltage drop across the transistors Q1, Q2, Q3, so as to achieve the purpose of adjusting the current flowing through the LED string 71, 72, 73 [0010] 73', to achieve constant current, while changing the LED through PWM signals of different frequencies The blinking frequency of the LEDs 74 in the strings 71, 72, 73 achieves the goal of saving energy in the case where human vision cannot sense the flicker of the lamp.
下面以第一LED燈串71所在的迴路為例具體說明該LED燈 具的驅動電路的工作過程。該微控制器68的第一比較端 S1上的電壓大小等於第四檢測電阻R4兩端的電壓大小， 第四檢測電阻R4兩端的電壓值等於流經第一 LED燈串71的 電流值與第四檢測電阻R4的阻值的乘積。當流經該第一 LED燈串71的電流大小大於或者小於設定電流時，微控制 器68通過將第一比較端S1的電壓值與内部的基準電壓值 進行比較，確定第四檢測電阻R4兩端的電壓值大於基準 電壓值，因此微控制器68根據比較的結果改變第一控制 端G1輸出的PWM信號的頻率，從而改變第一場效應晶體管 Q1的内阻，達到調整流經第一LED燈串71中電流大小的目 的。此時假設該微控制器68的第一控制端G1輸出頻率為 100Hz的PWM信號，當PWM信號為高電位時，第一場效應 晶體管Q1的閘極為高電位，因而第一場效應晶體管Q1導 通，穩壓電路40通過第一 LED燈串71、第一場效應晶體管 099102968 表單編號A0101 第9頁/共16頁 0992005632-0 201129227 Q1、第四檢測電阻R4形成迴路，第一LED燈串71中的 LED74點亮；當PWM信號為低電位時，第一場效應晶體管 Q1的閘極為低電位，第一場效應晶體管Q1截止，穩壓電 路40通過第一LED燈串71 '第一限流電阻R1及第一輸入 端D1形成迴路，由於所述限流電路R1的阻值很大使得第 一輸入端D1呈高阻態，第一LED燈串71與微控制器68的 第一輸入端D1之間近似斷路的狀態，流經第一 LED燈串71 和第一限流電阻R1的電流大小接近零，因此第一LED燈串 71中的LED74熄滅。所述第一場效應晶體管Q1在第一控 制端G1所輸出的PWM信號的控制下，反復於導通和截止之 間做切換，使得第一LED燈串71中的LED74不斷於點亮和 熄滅之間切換，呈閃爍的狀態。而由於該微控制器68的 控制端Gl、G2、G3輸出的PWM信號的頻率在60Hz以上， 該LED燈具70中的LED74在點亮和熄滅狀態之間的切換頻 率，即閃爍的頻率也在60Hz以上，由於人眼的餘輝效應 ，當LED74的閃燦的頻率在6〇Hz以上時，人眼不能識別 出閃爍’因此人眼會感覺LED燈具70中的LED74是持續點 亮的，從而不會影響使用。而在LED燈具70的使用期間内 ’所述每一 LED燈串71、72、73中的LED74實際上只在 PWM信號為高電位的時候消耗電能，而在ρψΜ信號為低電 位時是熄滅的’從而達到了節能的目的。可以理解的， 該LED燈具70中LED燈串的數量也可以是一個或者其他多 個，而所述場效應晶體管和微控制器的控制端、比較端 及輸入端的數量分別與LED燈串的數量相對應。 [0011]綜上所述，本發明符合發明專利之要件，爰依法提出專 099102968 表單編號A0101 第10頁/共16頁 0992005632-0 201129227 [0012] 利申請。惟以上所述者僅為本發明之較佳實施例，舉凡 熟悉本案技藝之人士，在爰依本發明精神所作之等效修 飾或變化，皆應涵蓋於以下之申請專利範圍内。 【圖式簡單說明】 圖1是本發明一實施例中發光二極體燈具的驅動電路的電 路示意圖。 [0013] 【主要元件符號說明】 交流電源：20 Ο [0014] 恒壓電路：30 [0015] 穩壓電路：40 [0016] 調壓電路：50 [0017] 控制電路：60 [0018] 第一結點：61 [0019] 第二結點：62 〇 [0020] 第三結點：63 [0021] 第四結點：64 [0022] 第五結點：65 [0023] 第六結點：66 [0024] 微控制器：68 [0025] LED燈具：70 [0026] 第一LED燈串：71 099102968 表單編號A0101 第11頁/共16頁 0992005632-0 201129227 [0027] 第二LED燈串：72 [0028] 第三LED燈串：73 [0029] LED ： 74 [0030] 第一場效應晶體管： Q1 [0031] 第二場效應晶體管： Q2 [0032] 第三場效應晶體管： Q3 [0033] 第一限流電阻：R1 [0034] 第二限流電阻：R2 [0035] 第三限流電阻：R3 [0036] 第四檢測電阻：R4 [0037] 第五檢測電阻：R5 [0038] 第六檢測電阻：R6 [0039] 電源端：VCC [0040] 回饋端：FB [0041] 接地端：GND [0042] 第一控制端：G1 [0043] 第二控制端：G2 [0044] 第三控制端：G3 [0045] 第一比較端：S1 099102968 表單編號A0101 第12頁/共16頁 0992005632-0 201129227 [0046] 第二比較端 ：S2 [0047] 第三比較端 ：S3 [0048] 第一輸入端 ：D1 [0049] 第二輸入端 ：D2 [0050] 第三輸入端 ：D3 Ο Ο 0992005632-0 099102968 表單編號Α0101 第13頁/共16頁The working process of the driving circuit of the LED lamp will be specifically described below by taking the circuit in which the first LED lamp string 71 is located as an example. The voltage on the first comparison terminal S1 of the microcontroller 68 is equal to the voltage across the fourth detection resistor R4, and the voltage across the fourth detection resistor R4 is equal to the current value flowing through the first LED string 71 and the fourth. The product of the resistance of the resistor R4 is detected. When the magnitude of the current flowing through the first LED string 71 is greater than or less than the set current, the microcontroller 68 determines the fourth detecting resistor R4 by comparing the voltage value of the first comparing terminal S1 with the internal reference voltage value. The voltage value of the terminal is greater than the reference voltage value, so the microcontroller 68 changes the frequency of the PWM signal output by the first control terminal G1 according to the result of the comparison, thereby changing the internal resistance of the first field effect transistor Q1 to achieve adjustment through the first LED lamp. The purpose of the current magnitude in string 71. At this time, it is assumed that the first control terminal G1 of the microcontroller 68 outputs a PWM signal having a frequency of 100 Hz. When the PWM signal is high, the gate of the first field effect transistor Q1 is extremely high, and thus the first field effect transistor Q1 is turned on. The voltage stabilizing circuit 40 forms a loop through the first LED light string 71, the first field effect transistor 099102968, the form number A0101, the 9th page, the 16th page, the 0992005632-0 201129227 Q1, the fourth detecting resistor R4, and the first LED string 71 The LED 74 is lit; when the PWM signal is low, the gate of the first field effect transistor Q1 is extremely low, the first field effect transistor Q1 is turned off, and the voltage stabilizing circuit 40 passes the first LED string 71 'the first current limiting resistor R1 and the first input terminal D1 form a loop. Since the resistance of the current limiting circuit R1 is large, the first input terminal D1 is in a high impedance state, and the first LED string 71 and the first input terminal D1 of the microcontroller 68 In a state of approximately open circuit, the magnitude of the current flowing through the first LED string 71 and the first current limiting resistor R1 is close to zero, so that the LED 74 in the first LED string 71 is extinguished. The first field effect transistor Q1 is repeatedly switched between on and off under the control of the PWM signal outputted by the first control terminal G1, so that the LED 74 in the first LED string 71 is continuously lit and extinguished. Switching between, flashing state. And because the frequency of the PWM signal outputted by the control terminals G1, G2, and G3 of the microcontroller 68 is above 60 Hz, the switching frequency of the LED 74 in the LED lamp 70 between the on and off states, that is, the frequency of the flicker is also Above 60 Hz, due to the afterglow effect of the human eye, when the flashing frequency of the LED 74 is above 6 Hz, the human eye cannot recognize the flicker 'so the human eye will feel that the LED 74 in the LED illuminator 70 is continuously lit, thereby Will not affect the use. During the use of the LED luminaire 70, the LEDs 74 of each of the LED strings 71, 72, 73 actually consume power only when the PWM signal is at a high potential, and are extinguished when the ρ ψΜ signal is at a low potential. 'Therefore achieving the goal of energy saving. It can be understood that the number of LED strings in the LED lamp 70 can also be one or more, and the number of the control terminal, the comparison terminal and the input terminal of the field effect transistor and the microcontroller are respectively different from the number of LED strings. Corresponding. [0011] In summary, the present invention meets the requirements of the invention patent, and is legally proposed. 099102968 Form No. A0101 Page 10 / Total 16 Pages 0992005632-0 201129227 [0012] The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a circuit diagram showing a driving circuit of a light-emitting diode lamp according to an embodiment of the present invention. [0012] [Main component symbol description] AC power supply: 20 Ο [0014] Constant voltage circuit: 30 [0015] Voltage regulator circuit: 40 [0016] Voltage regulator circuit: 50 [0017] Control circuit: 60 [0018] One node: 61 [0019] Second node: 62 〇 [0020] Third node: 63 [0021] Fourth node: 64 [0022] Fifth node: 65 [0023] Sixth node: 66 [0024] Microcontroller: 68 [0025] LED Lamp: 70 [0026] First LED String: 71 099102968 Form No. A0101 Page 11 of 16 0992005632-0 201129227 [0027] Second LED String: [0028] Third LED String: 73 [0029] LED: 74 [0030] First Field Effect Transistor: Q1 [0031] Second Field Effect Transistor: Q2 [0032] Third Field Effect Transistor: Q3 [0033] First current limiting resistor: R1 [0034] Second current limiting resistor: R2 [0035] Third current limiting resistor: R3 [0036] Fourth detecting resistor: R4 [0037] Fifth detecting resistor: R5 [0038] Sixth Detection resistance: R6 [0039] Power supply terminal: VCC [0040] Feedback terminal: FB [0041] Ground terminal: GND [0042] First control terminal: G1 [0043] Second control terminal: G2 [0044] Third control terminal: G3 [0045] First comparison terminal: S1 099102968 Form number A0101 Page 12/16 pages 0992005632-0 201129227 [0046] Second comparison end: S2 [0047] Third comparison end: S3 [0048] First input: D1 [0049] Second input: D2 [0050] Third input: D3 Ο Ο 0992005632-0 099102968 Form number Α 0101 Page 13 of 16