本創作涉及電路領域，更具體地涉及一種LED驅動電路。The present invention relates to the field of circuits, and more particularly to an LED driving circuit.
目前，LED(Light Emitting Diode，發光二極體)技術日趨成熟。由於LED具有發光效率高、使用壽命長等特點，在照明領域已經逐步取代傳統的白熾燈。但是，當LED應用於現有的相容TRIAC(Triode AC Semiconductor Switch)調光器的LED驅動電路時，由於這種現有的LED驅動電路的相容性較差，造成LED閃爍。另外，現有的相容TRIAC調光器的LED驅動電路由於電路複雜，一方面成本高，另一方面印刷電路尺寸大，無法直接放入燈頭介面內。At present, LED (Light Emitting Diode) technology is maturing. Due to the high luminous efficiency and long service life of LEDs, traditional incandescent lamps have been gradually replaced in the field of lighting. However, when the LED is applied to an existing LED driving circuit of a compatible TRIAC (Triode AC Semiconductor Switch) dimmer, the compatibility of the existing LED driving circuit is poor, causing the LED to flicker. In addition, the existing LED driving circuit of the compatible TRIAC dimmer has high cost on the one hand, and the printed circuit has a large size on the other hand, and cannot be directly placed in the lamp head interface.
本創作提供了一種新穎的LED驅動電路。This creation provides a novel LED driver circuit.
根據本創作實施例的LED驅動電路，包括交流整流電路、線性恒流電路、以及輸出濾波電路，其中：交流整流電路的第一端子和第二端子分別與交流輸入的正極和負極連接，第三端子和第四端子分別與線性恒流電路的第一端子和第二端子連接；線性恒流電路的第一端子還與輸出濾波電路的第一端子連接，第二端子還接地，第三端子和第四端子分別與輸出濾波電路的第二端子和第三端子連接。The LED driving circuit according to the present embodiment includes an alternating current rectifying circuit, a linear constant current circuit, and an output filter circuit, wherein: the first terminal and the second terminal of the alternating current rectifying circuit are respectively connected to the positive and negative terminals of the alternating current input, and the third The terminal and the fourth terminal are respectively connected to the first terminal and the second terminal of the linear constant current circuit; the first terminal of the linear constant current circuit is further connected to the first terminal of the output filter circuit, the second terminal is also grounded, the third terminal and The fourth terminals are respectively connected to the second terminal and the third terminal of the output filter circuit.
在根據本創作實施例的LED驅動電路中，交流輸入是TRIAC調光器的輸出。In the LED drive circuit according to the present creative embodiment, the AC input is the output of the TRIAC dimmer.
在根據本創作實施例的LED驅動電路中，線性恒流電路包括線性恒流控制晶片，該線性恒流控制晶片包括晶片高壓供電輸入腳、LED電流輸入腳、LED電流設定腳、維持電流設定腳、以及晶片基準地。In the LED driving circuit according to the present embodiment, the linear constant current circuit includes a linear constant current control chip including a wafer high voltage power supply input pin, an LED current input pin, an LED current setting pin, and a sustain current setting pin. And the wafer reference ground.
在根據本創作實施例的LED驅動電路中，線性恒流電路進一步包括高壓供電電阻，該高壓供電電阻連接在線性恒流電路的第一端子與晶片高壓供電輸入腳之間。In the LED driving circuit according to the present embodiment, the linear constant current circuit further includes a high voltage power supply resistor connected between the first terminal of the linear constant current circuit and the high voltage power supply input pin of the wafer.
在根據本創作實施例的LED驅動電路中，線性恒流電路進一步包括電流感測電阻，該電流感測電阻連接在LED電流設定腳與晶片基準地之間。In the LED driving circuit according to the present creative embodiment, the linear constant current circuit further includes a current sensing resistor connected between the LED current setting pin and the wafer reference ground.
在根據本創作實施例的LED驅動電路中，線性恒流電路進一步包括維持電流設置電阻，該維持電流設置電阻連接在維持電流設定腳與晶片基準地之間。In the LED drive circuit according to the present embodiment, the linear constant current circuit further includes a sustain current setting resistor connected between the sustain current setting pin and the wafer reference ground.
在根據本創作實施例的LED驅動電路中，線性恒流電路包括兩個線性恒流控制晶片，在兩個線性恒流控制晶片中的每個線性恒流控制晶片中：包括晶片高壓供電輸入腳、LED電流輸入腳、LED電流設定腳、維持電流設定腳、以及晶片基準地，晶片高壓供電輸入腳經由高壓供電電阻與交流整流電路的第一端子連接，維持電流設定腳經由維持電流設置電阻與晶片基準地連接，LED電流設定腳經由電流感測電阻與晶片基準地連接；兩個線性恒流控制晶片中的第一線性恒流控制晶片的LED電流輸入腳和LED電流設定腳作為線性恒流電路的第三端子和第四端子，分別與輸出濾波電路的第二端子和第三端子連接；兩個線性恒流控制晶片中的第二線性恒流控制晶片的LED電流輸入腳與第一線性恒流控制晶片的晶片基準地連接。In the LED driving circuit according to the present creative embodiment, the linear constant current circuit includes two linear constant current control wafers in each of the two linear constant current control wafers: including the high voltage power supply input pin of the wafer The LED current input pin, the LED current setting pin, the sustain current setting pin, and the wafer reference ground, the high voltage power supply input pin of the chip is connected to the first terminal of the AC rectifying circuit via the high voltage power supply resistor, and the holding current setting pin is connected to the holding current via the holding current. The chip is grounded, the LED current setting pin is connected to the wafer reference ground via the current sensing resistor; the LED current input pin and the LED current setting pin of the first linear constant current control chip in the two linear constant current control wafers are linearly constant The third terminal and the fourth terminal of the flow circuit are respectively connected to the second terminal and the third terminal of the output filter circuit; the LED current input pin of the second linear constant current control chip in the two linear constant current control chips and the first The wafers of the linear constant current control wafer are connected in a reference manner.
在根據本創作實施例的LED驅動電路中，輸出濾波電路包括第一和第二二極體、以及第一和第二電容器，第一LED串與第一電容器形成第一並聯元件，第二LED串與第二電容器形成第二並聯元件，第一二極體、第一並聯元件、第二二極體、以及第二並聯元件串列連接在輸出濾波電路的第一端子和第三端子之間，輸出濾波電路的第二端子位於第一並聯元件與第二二極體之間。In the LED driving circuit according to the present creative embodiment, the output filter circuit includes first and second diodes, and first and second capacitors, the first LED string and the first capacitor form a first parallel element, and the second LED The string and the second capacitor form a second parallel element, and the first diode, the first parallel element, the second diode, and the second parallel element are connected in series between the first terminal and the third terminal of the output filter circuit The second terminal of the output filter circuit is located between the first parallel element and the second diode.
相比傳統的LED驅動電路，根據本創作實施例的LED驅動電路不僅解決了LED閃爍的問題，而且可以放入燈頭介面內。LED according to the present creative embodiment compared to a conventional LED driving circuitThe drive circuit not only solves the problem of LED flicker, but also can be placed in the lamp head interface.
1‧‧‧交流整流電路1‧‧‧AC rectifier circuit
2‧‧‧線性恒流電路2‧‧‧linear constant current circuit
3‧‧‧輸出濾波電路3‧‧‧Output filter circuit
F1‧‧‧保險絲F1‧‧‧Fuse
D1、D2、D3、D4‧‧‧整流二極體D1, D2, D3, D4‧‧‧ Rectifiers
D5、D6‧‧‧二極體D5, D6‧‧‧ diode
VAC‧‧‧交流輸入電壓VAC ‧‧‧AC input voltage
VIN‧‧‧輸入電壓VIN ‧‧‧ input voltage
IIN‧‧‧輸入電流IIN ‧‧‧Input current
LED1、LED2‧‧‧燈串LED1, LED2‧‧‧ string lights
R1、R2‧‧‧高壓供電電阻R1, R2‧‧‧ high voltage power supply resistor
R3、R4‧‧‧電流感測電阻R3, R4‧‧‧ current sense resistor
R5、R6‧‧‧維持電流設置電阻R5, R6‧‧‧ maintain current setting resistor
HV‧‧‧晶片高壓供電輸入腳HV‧‧‧ wafer high voltage power supply input pin
DRAIN‧‧‧LED電流輸入腳DRAIN‧‧‧LED current input pin
CS‧‧‧LED電流設定腳CS‧‧‧LED current setting foot
BL‧‧‧維持電流設定腳BL‧‧‧Maintaining current setting feet
GND‧‧‧晶片基準地GND‧‧‧ wafer reference ground
C1、C2‧‧‧電容器C1, C2‧‧‧ capacitor
U1、U2‧‧‧線性恒流控制晶片U1, U2‧‧‧linear constant current control chip
從下面結合附圖對本創作的具體實施方式的描述中可以更好地理解本創作，其中：第1圖示出了根據本創作實施例的LED驅動電路的電路圖；第2圖示出了第1圖所示的LED驅動電路的工作狀態波形圖。The present invention can be better understood from the following description of the specific embodiments of the present invention with reference to the accompanying drawings in which: FIG. 1 is a circuit diagram of an LED driving circuit according to the present embodiment; FIG. 2 shows the first The waveform diagram of the operating state of the LED driving circuit shown in the figure.
現在將參考附圖更全面地描述示例實施方式。然而，示例實施方式能夠以多種形式實施，且不應被理解為限於在此闡述的實施方式；相反，提供這些實施方式使得本創作更全面和完整，並將示例實施方式的構思全面地傳達給本領域的技術人員。在圖中相同的附圖標記表示相同或類似的結構，因而將省略它們的詳細描述。Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be embodied in a variety of forms and should not be construed as being limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the example embodiments. Those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.
鑒於傳統的LED驅動電路存在的局限性，本創作提出了一種新穎的LED驅動電路。下面結合附圖，詳細描述根據本創作實施例的LED驅動電路。In view of the limitations of the traditional LED driver circuit, this novel proposes a novel LED driver circuit. The LED driving circuit according to the present embodiment will be described in detail below with reference to the accompanying drawings.
第1圖示出了根據本創作實施例的LED驅動電路的電路圖。如第1圖所示，該LED驅動電路包括交流整流電路1、線性恒流電路2、以及輸出濾波電路3，其中：交流整流電路1的第一端子和第二端子分別與交流輸入的正極和負極連接，第三端子和第四端子分別與線性恒流電路2的第一端子和第二端子連接；線性恒流電路2的第一端子還與輸出濾波電路3的第一端子連接，第二端子還接地，第三端子和第四端子分別與輸出濾波電路3的第二端子和第三端子連接。Fig. 1 is a circuit diagram showing an LED driving circuit according to the present embodiment. As shown in FIG. 1, the LED driving circuit includes an AC rectifying circuit 1, a linear constant current circuit 2, and an output filter circuit 3, wherein: the first terminal and the second terminal of the AC rectifying circuit 1 are respectively connected to the positive pole of the AC input. a cathode connection, a third terminal and a fourth terminal are respectively connected to the first terminal and the second terminal of the linear constant current circuit 2; the first terminal of the linear constant current circuit 2 is further connected to the first terminal of the output filter circuit 3, and second The terminal is also grounded, and the third terminal and the fourth terminal are respectively connected to the second terminal and the third terminal of the output filter circuit 3.
下面結合附圖，詳細描述第1圖所示的LED驅動電路的各個組成部分。The respective components of the LED drive circuit shown in Fig. 1 will be described in detail below with reference to the accompanying drawings.
如第1圖所示，交流整流電路1包括保險絲F1、以及整流二極體D1、D2、D3、D4；交流輸入電壓VAC經過交流整流電路1進行整流後生成經整流的輸入電壓VIN(為了方便，下面稱為輸入電壓VIN)；與輸入電壓VIN相對應的輸入電流記為IIN。這裡，交流整流電路1的交流輸入可以是普通的交流電輸入，也可以是TRIAC調光器的輸出。As shown in FIG. 1, the AC rectifying circuit 1 includes a fuse F1 and rectifying diodes D1, D2, D3, and D4; the AC input voltage VAC is rectified by the AC rectifying circuit 1 to generate a rectified input voltage VIN ( For convenience, hereinafter referred to as input voltage VIN ); the input current corresponding to input voltage VIN is denoted as IIN . Here, the AC input of the AC rectifier circuit 1 may be a normal AC input or an output of a TRIAC dimmer.
如第1圖所示，線性恒流電路2包括線性恒流控制晶片U1和U2、高壓供電電阻R1和R2、電流感測電阻R3和R4、以及維持電流設置電阻R5和R6；線性恒流控制晶片U1和U2包括晶片高壓供電輸入腳(HV腳)、LED電流輸入腳(DRAIN腳)、LED電流設定腳(CS腳)、維持電流設定腳(BL腳)、以及晶片基準地(GND)；在線性恒流控制晶片U1中，HV腳經由高壓供電電阻R2與交流整流電路1的第一端子連接，BL腳經由維持電流設置電阻R5與GND連接，CS腳經由電流感測電阻R3與GND連接，並且DRAIN腳和CS腳作為線性恒流電路2的第三端子和第四端子分別與輸出濾波電路的第二端子和第三端子連接；在線性恒流控制晶片U2中，HV腳經由高壓供電電阻R1與交流整流電路1的第一端子連接，BL腳經由維持電流設置電阻R6與GND連接，CS腳經由電流感測電阻R4與GND連接，並且DRAIN腳與線性恒流控制晶片U1的GND連接。As shown in Fig. 1, the linear constant current circuit 2 includes linear constant current control chips U1 and U2, high voltage supply resistors R1 and R2, current sense resistors R3 and R4, and sustain current setting resistors R5 and R6; linear constant current control The wafers U1 and U2 include a wafer high voltage power supply input pin (HV pin), an LED current input pin (DRAIN pin), an LED current setting pin (CS pin), a sustain current setting pin (BL pin), and a wafer reference ground (GND); In the linear constant current control chip U1, the HV pin is connected to the first terminal of the AC rectifying circuit 1 via the high voltage supply resistor R2, the BL pin is connected to the GND via the holding current setting resistor R5, and the CS pin is connected to the GND via the current sensing resistor R3. And the DRAIN pin and the CS pin are connected as the third terminal and the fourth terminal of the linear constant current circuit 2 to the second terminal and the third terminal of the output filter circuit, respectively; in the linear constant current control chip U2, the HV pin is powered via the high voltage The resistor R1 is connected to the first terminal of the AC rectifier circuit 1, the BL pin is connected to the GND via the sustain current setting resistor R6, the CS pin is connected to the GND via the current sensing resistor R4, and the DRAIN pin is connected to the GND of the linear constant current control wafer U1. .
如第1圖所示，輸出濾波電路3包括二極體D5和D6、以及電容器C1和C2；燈串LED1與電容器C1形成第一並聯組件，燈串LED2與電容器C2形成第二並聯元件；二極體D5、第一並聯元件、二極體D6、以及第二並聯元件串列連接在輸出濾波電路3的第一端子和第三端子之間；輸出濾波電路3的第二端子位於第一並聯元件與二極體D6之間。As shown in FIG. 1, the output filter circuit 3 includes diodes D5 and D6, and capacitors C1 and C2; the lamp string LED1 and the capacitor C1 form a first parallel component, and the lamp string LED2 and the capacitor C2 form a second parallel component; The pole body D5, the first parallel element, the diode D6, and the second parallel element are connected in series between the first terminal and the third terminal of the output filter circuit 3; the second terminal of the output filter circuit 3 is located in the first parallel Between the component and the diode D6.
第2圖示出了第1圖所示的LED驅動電路的工作狀態波形圖，其中上方的正弦波形為輸入電壓VIN的波形，下方的階梯波形為輸入電流IIN的波形。如第2圖所示，在輸入電壓VIN的一個週期，第1圖所示的LED驅動電路的工作狀態可以分為以下五個階段：Fig. 2 is a view showing an operation state waveform diagram of the LED drive circuit shown in Fig. 1, wherein the upper sinusoidal waveform is a waveform of the input voltage VIN , and the lower staircase waveform is a waveform of the input current IIN . As shown in Fig. 2, in one cycle of the input voltage VIN , the operating state of the LED driving circuit shown in Fig. 1 can be divided into the following five stages:
第一階段：輸入電壓VIN小於燈串LED1的開啟電壓。此時，線性恒流控制晶片U1、U2內部的維持電流電路開啟，通過電阻R5、R6可設置維持電流的大小，以保證在輸入側有TRIAC調光器時TRIAC調光器不會誤關斷。The first stage: the input voltage VIN is smaller than the turn-on voltage of the string LED1. At this time, the linear constant current control wafer U1, U2 internal holding current circuit is turned on, through the resistors R5, R6 can set the holding current to ensure that the TRIAC dimmer does not erroneously turn off when there is a TRIAC dimmer on the input side .
第二階段：輸入電壓VIN大於燈串LED1的開啟電壓，且小於燈串LED1+燈串LED2的開啟電壓。此時，電流的流動路徑為燈串LED1->線性恒流控制晶片U1的DRAIN腳->線性恒流控制晶片U1的CS腳->R3->線性恒流控制晶片U2的DRAIN腳->線性恒流控制晶片U2的CS腳->R4，電阻R3決定了燈串LED1的輸出電流的大小，線性恒流控制晶片U1、U2內部的維持電流電路關閉。The second stage: the input voltage VIN is greater than the turn-on voltage of the light string LED1 and less than the turn-on voltage of the light string LED1 + light string LED2. At this time, the flow path of the current is the LED string 1-> DRAIN pin of the linear constant current control wafer U1 -> CS pin of the linear constant current control wafer U1 -> R3 - DRAIN pin of the linear constant current control wafer U2 -> linear The constant current control chip U2 CS pin -> R4, the resistor R3 determines the output current of the lamp string LED1, and the linear constant current control wafer U1, U2 internal holding current circuit is closed.
第三階段：輸入電壓VIN大於燈串LED1+燈串LED2的開啟電壓。此時，電流的流動路徑為燈串LED1->燈串LED2->R3->線性恒流控制晶片U2的DRAIN腳->線性恒流控制晶片U2的CS腳->R4，電阻R4決定了燈串LED1+燈串LED2的輸出電流的大小，線性恒流控制晶片U1、U2內部的維持電流電路關閉。The third stage: the input voltage VIN is greater than the turn-on voltage of the string LED1 + string LED2. At this time, the current flow path is the LED string 1->light string LED2->R3-> linear constant current control wafer U2 DRAIN foot -> linear constant current control chip U2 CS pin -> R4, resistor R4 determines the lamp The magnitude of the output current of the string LED1+light string LED2, and the holding current circuit inside the linear constant current control wafers U1, U2 are turned off.
第四階段：輸入電壓VIN小於燈串LED1+燈串LED2的開啟電壓，且大於燈串LED1的開啟電壓。此時，LED驅動電路的工作狀態與其第二階段的工作狀態相同。The fourth stage: the input voltage VIN is smaller than the turn-on voltage of the lamp string LED1 + the lamp string LED2, and is greater than the turn-on voltage of the lamp string LED1. At this time, the operating state of the LED driving circuit is the same as that of the second stage.
第五階段：輸入電壓VIN小於燈串LED1的開啟電壓。此時，LED驅動電路的工作狀態與其第一階段的工作狀態相同。The fifth stage: the input voltage VIN is lower than the turn-on voltage of the string LED1. At this time, the operating state of the LED driving circuit is the same as that of the first stage.
相比傳統的LED驅動電路，根據本創作實施例的LED驅動電路不僅解決了LED閃爍的問題，而且可以放入燈頭介面內。Compared with the conventional LED driving circuit, the LED driving circuit according to the present creative embodiment not only solves the problem of LED flicker, but also can be placed in the lamp head interface.
本創作可以以其他的具體形式實現，而不脫離其精神和本質特徵。因此，當前的實施例在所有方面都被看作是示例性的而非限定性的，本創作的範圍由所附申請專利範圍而非上述描述定義，並且，落入申請專利範圍的含義和等同物的範圍內的全部改變從而都被包括在本創作的範圍之中。This creation can be implemented in other specific forms without departing from its spirit and essential characteristics. The present embodiments are to be considered in all respects as illustrative and not restrictive, and the scope of the invention is defined by the scope of the appended claims All changes within the scope of the object are thus included in the scope of this creation.
1‧‧‧交流整流電路1‧‧‧AC rectifier circuit
2‧‧‧線性恒流電路2‧‧‧linear constant current circuit
3‧‧‧輸出濾波電路3‧‧‧Output filter circuit
F1‧‧‧保險絲F1‧‧‧Fuse
D1、D2、D3、D4‧‧‧整流二極體D1, D2, D3, D4‧‧‧ Rectifiers
D5、D6‧‧‧二極體D5, D6‧‧‧ diode
VAC‧‧‧交流輸入電壓VAC ‧‧‧AC input voltage
VIN‧‧‧輸入電壓VIN ‧‧‧ input voltage
IIN‧‧‧輸入電流IIN ‧‧‧Input current
LED1、LED2‧‧‧燈串LED1, LED2‧‧‧ string lights
R1、R2‧‧‧高壓供電電阻R1, R2‧‧‧ high voltage power supply resistor
R3、R4‧‧‧電流感測電阻R3, R4‧‧‧ current sense resistor
R5、R6‧‧‧維持電流設置電阻R5, R6‧‧‧ maintain current setting resistor
HV‧‧‧晶片高壓供電輸入腳HV‧‧‧ wafer high voltage power supply input pin
DRAIN‧‧‧LED電流輸入腳DRAIN‧‧‧LED current input pin
CS‧‧‧LED電流設定腳CS‧‧‧LED current setting foot
BL‧‧‧維持電流設定腳BL‧‧‧Maintaining current setting feet
GND‧‧‧晶片基準地GND‧‧‧ wafer reference ground
C1、C2‧‧‧電容器C1, C2‧‧‧ capacitor
U1、U2‧‧‧線性恒流控制晶片U1, U2‧‧‧linear constant current control chip
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620692127.9UCN205946245U (en) | 2016-07-04 | 2016-07-04 | LED driving circuit |
| Publication Number | Publication Date |
|---|---|
| TWM532705Utrue TWM532705U (en) | 2016-11-21 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW105212434UTWM532705U (en) | 2016-07-04 | 2016-08-16 | LED driving circuit |
| Country | Link |
|---|---|
| CN (1) | CN205946245U (en) |
| TW (1) | TWM532705U (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI615060B (en)* | 2017-01-05 | 2018-02-11 | Huang Ying Dian | Light-emitting diode driving device and driving method thereof |
| TWI661744B (en)* | 2018-01-19 | 2019-06-01 | 集邦聯合製造股份有限公司 | Lighting system of alternate current light-emitting diodes |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI615060B (en)* | 2017-01-05 | 2018-02-11 | Huang Ying Dian | Light-emitting diode driving device and driving method thereof |
| US10154557B2 (en) | 2017-01-05 | 2018-12-11 | Jitboundary United Production Inc. | Light-emitting diode driver device having a multi-stage driver module and method for driving the same |
| TWI661744B (en)* | 2018-01-19 | 2019-06-01 | 集邦聯合製造股份有限公司 | Lighting system of alternate current light-emitting diodes |
| US10667353B2 (en) | 2018-01-19 | 2020-05-26 | Jitboundary United Production Inc. | Lighting system of alternate current light-emitting diodes |
| Publication number | Publication date |
|---|---|
| CN205946245U (en) | 2017-02-08 |
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