TW201622483A - Light-emitting diode (LED) device suitable for different voltage sources - Google Patents
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本發明係一種發光二極體裝置,尤指一種適用不同電壓源之發光二極體裝置。The invention relates to a light-emitting diode device, in particular to a light-emitting diode device suitable for different voltage sources.
隨著近年來節能減碳與環保意識的抬頭,世界各地的大型公共建設如公路照明、交通號誌、大型看板等皆逐漸改用發光效率較佳且省電的發光二極體元件來取代原有的白熾燈泡及螢光燈管,不僅有較長的使用壽命且具有較佳的發光效率,以節省維護照明所需的電能與經費支出,且歐美各國亦更進一步制定出白熾燈泡禁用令,使得一般民生用途如居家照明、裝潢燈飾、祭祀慶典等照明設備,更進一步朝向全面發光二極體元件化邁進,因此世界各國的燈具製造商紛紛致力於發光二極體元件照明發展。With the rise of energy conservation, carbon reduction and environmental awareness in recent years, large-scale public buildings around the world, such as highway lighting, traffic signs, and large billboards, have gradually replaced the light-emitting diode components with better luminous efficiency and power saving. Some incandescent bulbs and fluorescent tubes not only have a long service life, but also have better luminous efficiency, so as to save energy and expenses for maintenance of lighting, and European and American countries have further developed an incandescent bulb prohibition order. Lighting equipment such as home lighting, decorative lighting, and ceremonial celebrations are further advanced towards full-light LED components. Therefore, lighting manufacturers around the world are committed to the development of lighting diode components.
現有技術之單電壓發光二極體燈的驅動電路結構,係採用線性式電源的設計,其電路較簡單、體積小且成本低,然而顧名思義其僅能用於唯一特定電壓條件下,對消費者而言於購買時需詳加注意,一不小心購買錯誤規格不僅浪費金錢,且若在不知情的狀況下裝設於錯誤對應電壓的插座上時,亦會造成使用上的危險;對製造商而言,為因應國內現行市電110伏特與220伏特兩種電壓規格條件,而各需製造一定數量置於倉儲,不僅增加製作數量上的成本更增加倉儲管理支出。對消費者而言,傳統的燈座採行具有啟動器的設計,若欲於傳統的燈座裝設發光二極體燈,由於發光二極體燈具的工作原理與傳統燈管不同,其接電有方向限制,因此一般市面上的做法則必須手動摘除啟動器,以避免發光二極體燈遭燒毀,惟如是作法明顯過於繁複不便。The driving circuit structure of the prior art single-voltage light-emitting diode lamp adopts a linear power supply design, and the circuit is simple, small in size and low in cost, but as the name suggests, it can only be used under unique specific voltage conditions for consumers. In addition, it is necessary to pay attention to the purchase. If you accidentally purchase the wrong specifications, it will not only waste money, but if you install it on the socket with the wrong voltage without knowing it, it will also cause danger in use. In order to cope with the current domestic power supply 110 volts and 220 volts two voltage specifications, each need to manufacture a certain amount of storage, not only increase the cost of production, but also increase storage management expenses. For consumers, the traditional lamp holder adopts the design of the starter. If the traditional lamp holder is to be equipped with the light-emitting diode lamp, the working principle of the light-emitting diode lamp is different from that of the traditional lamp tube. There is a directional restriction on electricity. Therefore, in general, the driver must manually remove the starter to avoid the burning of the LED lamp. However, the method is obviously too complicated and inconvenient.
現有技術中的發光二極體燈有一種全電壓發光二極體燈的驅動電路結構,係採用將二個發光二極體燈串之間串並聯切換,以適用於全電壓的電源供應,於高電壓時將二個發光二極體燈串串聯,並於低電壓時將二個發光二極體燈串並聯。而現有技術的全電壓發光二極體燈僅針對目前國內市電標準提供的110伏特與220伏特設計,此兩種規格的電壓,恰巧呈倍數關係。因此可直接將相同的二個發光二極體於高電壓時串聯,以兩倍數量的發光二極體燈串共同承受220伏特的電源供應,而於低電壓時並聯,令各發光二極體燈串分別適用於110伏特的電源供應。The light-emitting diode lamp of the prior art has a driving circuit structure of a full-voltage LED lamp, which adopts a series-parallel switching between two light-emitting diode strings to apply to a full-voltage power supply. At high voltages, two LED strings are connected in series, and two LEDs are connected in parallel at low voltage. The prior art full-voltage LED lamp is only designed for the 110 volts and 220 volts provided by the current domestic utility standard, and the voltages of the two specifications coincide with a multiple relationship. Therefore, the same two light-emitting diodes can be directly connected in series at a high voltage, and the power supply of 220 volts is shared by two times of the light-emitting diode strings, and the light-emitting diodes are connected in parallel at a low voltage. The strings are for a 110 volt power supply.
但於其他國家的市電標準就不一定是恰巧兩倍之情況,舉例來說,115伏特及240伏特,於此種狀況下,若將二個發光二極體燈串的跨壓設計為115伏特時,在115伏特的電源供應下,透過並聯該二個發光二極體燈串,尚能正常使用,但若在240伏特的電源供應下,即便將該二個發光二極體燈串串聯,所能承受之跨壓係115伏特之兩倍,即230伏特,並無法承受240伏特之跨壓,因而導致承受過大的跨壓而損壞。因此,當電源供應的二種電壓值並非呈倍數關係時,則無法使用現有技術的全電壓發光二極體驅動電路結構,故有必要進一步的改善。However, the power supply standards in other countries are not necessarily twice as good as, for example, 115 volts and 240 volts. Under such conditions, if the cross-voltage of two LED strings is 115 volts. At the time of the power supply of 115 volts, the two light-emitting diode strings can be normally used by parallel connection, but if the two light-emitting diode strings are connected in series under the power supply of 240 volts, It can withstand twice the pressure of 115 volts, or 230 volts, and cannot withstand a voltage of 240 volts, resulting in excessive over-pressure and damage. Therefore, when the two voltage values of the power supply are not in a multiple relationship, the prior art full-voltage LED driving circuit structure cannot be used, and further improvement is necessary.
有鑑於此,本發明主要目的係提供一種適用不同電壓源之發光二極體(Light-Emitting Diode;LED)裝置,以適用於二種不同電壓源,且該二種電壓源之間非呈倍數關係。In view of this, the main object of the present invention is to provide a Light-Emitting Diode (LED) device suitable for different voltage sources, which is applicable to two different voltage sources, and the voltage sources are not multiplied. relationship.
為達到上述之發明目的,本發明所採用的主要技術手段係令該適用不同電壓源之LED裝置包含有: 一第一LED燈串,係以一第一數量之LED串聯所構成; 一第二LED燈串,係以該第一數量之LED串聯所構成; 一電壓檢測電路,係連接至一電源端,且於該電源端之電壓值為一第一電壓值時,輸出一第一檢測訊號,而於該電源端之電壓值為一第二電壓值時,輸出一第二檢測訊號;其中該第二電壓值大於該第一電壓值; 一串並聯控制電路,係具有一第三LED燈串,該串並聯控制電路係連接至該電壓檢測電路、該第一LED燈串及該第二LED燈串,且於接收到該第一檢測訊號時,控制該第一LED燈串與該第二LED燈串並聯於該電源端,而於接收到該第二檢測訊號時,控制該第一LED燈串、該第三LED燈串及該第二LED燈串串聯於該電源端;其中該第三LED燈串係以一第二數量之LED串聯所構成。In order to achieve the above object, the main technical means adopted by the present invention is that the LED device for different voltage sources includes: a first LED string, which is formed by a first number of LEDs connected in series; The LED light string is formed by connecting the first number of LEDs in series; a voltage detecting circuit is connected to a power terminal, and outputs a first detecting signal when the voltage value of the power terminal is a first voltage value And when the voltage value of the power terminal is a second voltage value, outputting a second detection signal; wherein the second voltage value is greater than the first voltage value; and the series of parallel control circuits having a third LED lamp a string, the series-parallel control circuit is connected to the voltage detecting circuit, the first LED string and the second LED string, and when the first detecting signal is received, controlling the first LED string and the first The second LED string is connected in parallel to the power terminal, and when the second detection signal is received, controlling the first LED string, the third LED string and the second LED string are connected in series to the power terminal; The third LED string is connected in series with a second number of LEDs Composition.
本發明的適用不同電壓源之LED裝置係透過於該電源端之電壓為第一電壓值時,將該第一、第二LED燈串並聯,令該第一、第二LED燈串分別接受該電壓源提供之電源,進行發光。且該第一、第二LED燈串分別具有相同數目的串聯LED,以適用於相同之電壓源。In the LED device of the present invention, when the voltage of the power supply terminal is the first voltage value, the first and second LED lights are connected in parallel, so that the first and second LED light strings respectively accept the The power source provided by the voltage source emits light. And the first and second LED light strings respectively have the same number of series LEDs to be applied to the same voltage source.
而當該電源端之電壓值為該第二電壓值時,即使該第二電壓值並非為該第一電壓值之兩倍,本發明將該第一、第三、第二LED燈串串聯以提供更多數目之串聯LED,該電源端所輸出之電壓仍可正常驅動本發明。另外,本發明額外設置該第三LED燈串,當啟動該第三LED燈串,相較於僅啟動第一、第二燈串,整體LED裝置可具有較強的亮度。And when the voltage value of the power terminal is the second voltage value, even if the second voltage value is not twice the first voltage value, the present invention connects the first, third, and second LED light strings in series to A greater number of series LEDs are provided, and the voltage output by the power terminals can still drive the present invention normally. In addition, the third LED light string is additionally provided by the present invention. When the third LED light string is activated, the overall LED device can have stronger brightness than when only the first and second light strings are activated.
以下配合圖示及本發明之較佳實施例,進一步闡述本發明為達成預定發明目的所採取的技術手段。The technical means adopted by the present invention for achieving the intended purpose of the invention are further described below in conjunction with the preferred embodiments of the invention.
請參閱圖1所示,本發明適用不同電壓源之發光二極體(LED)裝置的第一較佳實施例係包含一第一LED燈串10、一第二LED燈串20、一電壓檢測電路30及一串並聯控制電路40。Referring to FIG. 1 , a first preferred embodiment of a light emitting diode (LED) device for applying different voltage sources according to the present invention includes a first LED light string 10 , a second LED light string 20 , and a voltage detection. Circuit 30 and a series of parallel control circuits 40.
該第一LED燈串10係以一第一數量之LED串聯所構成,且具有一第一輸入端11及一第一輸出端12,且該第一輸入端11連接至一電源端VCC。該第二LED燈串20係以該第一數量之LED串聯所構成,且具有一第二輸入端21及一第二輸出端22,且該第二輸出端22連接至一接地端GND。The first LED string 10 is formed by connecting a first number of LEDs in series, and has a first input terminal 11 and a first output terminal 12, and the first input terminal 11 is connected to a power terminal VCC. The second LED string 20 is formed by connecting the first number of LEDs in series, and has a second input terminal 21 and a second output terminal 22, and the second output terminal 22 is connected to a ground terminal GND.
該電壓檢測電路30具有一電壓檢測端31及一訊號輸出端32,該電壓檢測端31係連接至該電源端VCC,以檢測該電源端VCC的電壓值。且該電壓檢測電路30係於該電源端VCC之電壓值為一第一電壓值時,由該訊號輸出端32輸出一第一檢測訊號,而於該電源端VCC之電壓值為一第二電壓值時,由該訊號輸出端32輸出一第二檢測訊號。該第二電壓值係大於該第一電壓值,且該第二電壓值係大於該第一電壓值之兩倍。The voltage detecting circuit 30 has a voltage detecting terminal 31 and a signal output terminal 32. The voltage detecting terminal 31 is connected to the power terminal VCC to detect the voltage value of the power terminal VCC. The voltage detecting circuit 30 outputs a first detection signal from the signal output terminal 32 when the voltage value of the power terminal VCC is a first voltage value, and the voltage value at the power terminal VCC is a second voltage. At the time of the value, a second detection signal is output from the signal output terminal 32. The second voltage value is greater than the first voltage value, and the second voltage value is greater than twice the first voltage value.
該串並聯控制電路40具有一訊號接收端41及一第三LED燈串42,該訊號接收端41連接至該電壓檢測電路30的訊號輸出端32,以接收該第一檢測訊號或該第二檢測訊號。該第三LED燈串42係以一第二數量之LED串聯所構成,且具有一第三輸入端421及一第三輸出端422。The serial-parallel control circuit 40 has a signal receiving end 41 and a third LED string 42. The signal receiving end 41 is connected to the signal output end 32 of the voltage detecting circuit 30 to receive the first detecting signal or the second. Detection signal. The third LED string 42 is formed by connecting a second number of LEDs in series, and has a third input terminal 421 and a third output terminal 422.
當該串並聯控制電路40接收到該第一檢測訊號時,係控制該第一LED燈串10的第一輸入端11連接至該第二LED燈串20的第二輸入端21,且控制該第一LED燈串10的第一輸出端12連接至該第二LED燈串20的第二輸出端22,使該第一LED燈串10與該第二LED燈串20並聯。When the serial-parallel control circuit 40 receives the first detection signal, the first input end 11 of the first LED string 10 is connected to the second input end 21 of the second LED string 20, and the The first output 12 of the first LED string 10 is coupled to the second output 22 of the second LED string 20 such that the first LED string 10 is in parallel with the second LED string 20.
當該串並聯控制電路40接收到該第二檢測訊號時,係控制該第一LED燈串10的第一輸出端12連接至該第三LED燈串42的第三輸入端421,且控制該第三LED燈串42的第三輸出端422連接至該第二LED燈串20的第二輸入端21,使該第一LED燈串10、第三LED燈串42及該第二LED燈串20串聯。When the serial-parallel control circuit 40 receives the second detection signal, the first output terminal 12 of the first LED string 10 is connected to the third input terminal 421 of the third LED string 42, and the The third output end 422 of the third LED string 42 is connected to the second input end 21 of the second LED string 20, so that the first LED string 10, the third LED string 42 and the second LED string 20 series.
該適用不同電壓源之LED裝置的第一較佳實施例係透過檢測該電源端VCC的電壓值,並根據該電源端VCC電壓值之大小,控制該第一LED燈串10與該第二LED燈串20的串並聯,以適用於不同電壓之電源供應。且該第一LED燈串10與該第二LED燈串20係分別由相同數量的LED串聯所構成,當正常通電發光時,該第一LED燈串10與該第二LED燈串20係具有相同之跨壓。因此,當該電源端VCC的電壓值為相對小的第一電壓值時,係將該第一LED燈串10與該第二LED燈串20並聯,使該第一LED燈串10與該第二LED燈串20之跨壓皆為該電源端VCC所提供的第一電壓值,以於低電壓的電源供應下正常通電發光。The first preferred embodiment of the LED device for different voltage sources detects the voltage value of the power terminal VCC and controls the first LED string 10 and the second LED according to the voltage value of the power terminal VCC. The strings 20 are connected in series and in parallel to supply power supplies of different voltages. And the first LED light string 10 and the second LED light string 20 are respectively formed by connecting the same number of LEDs in series, and when the normal light is emitted, the first LED light string 10 and the second LED light string 20 have The same cross pressure. Therefore, when the voltage value of the power terminal VCC is a relatively small first voltage value, the first LED string 10 is connected in parallel with the second LED string 20, so that the first LED string 10 and the first The voltage across the two LED strings 20 is the first voltage value provided by the power terminal VCC to normally emit light under a low voltage power supply.
而當該電源端VCC的電壓值為相對大的第二電壓值時,且該第二電壓值大於該第一電壓值之兩倍。若僅將該第一LED燈串10與該第二LED燈串20直接串聯後通以具有該第二電壓值之電源,因為該第一LED燈串10與該第二LED燈串20串聯後,係為兩倍第一數量的LED串聯所構成,能承受的跨壓為該第一電壓值之兩倍,但該第二電壓值係大於該第一電壓值之兩倍,故會造成串聯的該第一LED燈串10與該第二LED燈串20所承受的跨壓過大,而導致損壞,無法正常發光。因此,當該電源端VCC的電壓值為該第二電壓值時,係將該第一LED燈串10、第三LED燈串42及該第二LED燈串20串聯,藉由第三LED燈串42的設置,使得串聯的第一LED燈串10、第三LED燈串42及該第二LED燈串20內具有兩倍第一數量加上一倍第二數量的串聯LED,故能共同承受大於該第一電壓值兩倍之電壓源,即具有該第二電壓值之電源,且能夠正常發光,同時因為串聯LED的數量增加,,因此整體LED裝置能提供更強的亮度。And when the voltage value of the power terminal VCC is a relatively large second voltage value, and the second voltage value is greater than twice the first voltage value. If only the first LED string 10 and the second LED string 20 are directly connected in series, the power source having the second voltage value is passed, because the first LED string 10 is connected in series with the second LED string 20 , which is composed of twice the first number of LEDs connected in series, and the span voltage that can be withstood is twice the first voltage value, but the second voltage value is greater than twice the first voltage value, so The voltage across the first LED string 10 and the second LED string 20 is too large to cause damage and cannot be normally illuminated. Therefore, when the voltage value of the power terminal VCC is the second voltage value, the first LED string 10, the third LED string 42 and the second LED string 20 are connected in series by the third LED lamp. The string 42 is arranged such that the first LED string 10, the third LED string 42 and the second LED string 20 in series have twice the first number plus twice the second number of series LEDs, so A voltage source that is greater than twice the first voltage value, that is, a power source having the second voltage value, is capable of normal illumination, and because the number of series LEDs is increased, the overall LED device can provide greater brightness.
請參閱圖2所示,該電壓檢測電路30係具有一齊納二極體(Zener diode)D1、一第一電阻R1、一第二電阻R2、一第三電阻R3及一第一電晶體Q1。該齊納二極體D1之陽極連接至該接地端GND,而其陰極係連接至該第一電晶體Q1之源極。該第一電阻R1係連接於該第一電晶體Q1之閘極與該電源端VCC之間,而該第二電阻R2係連接於該第一電晶體Q1之閘極與該接地端GND之間。該第一電晶體Q1之汲極係透過該第三電阻R3連接至該電源端VCC。在本較佳實施例中,該第一電阻R1與該電源端VCC連接之一端即為該電壓檢測端31,而該第一電晶體Q1之汲極即為該訊號輸出端32。Referring to FIG. 2, the voltage detecting circuit 30 has a Zener diode D1, a first resistor R1, a second resistor R2, a third resistor R3, and a first transistor Q1. The anode of the Zener diode D1 is connected to the ground GND, and the cathode thereof is connected to the source of the first transistor Q1. The first resistor R1 is connected between the gate of the first transistor Q1 and the power terminal VCC, and the second resistor R2 is connected between the gate of the first transistor Q1 and the ground GND. . The drain of the first transistor Q1 is connected to the power terminal VCC through the third resistor R3. In the preferred embodiment, one end of the first resistor R1 connected to the power terminal VCC is the voltage detecting terminal 31, and the drain of the first transistor Q1 is the signal output terminal 32.
該串並聯控制電路40係進一步具有一第二電晶體Q2、一第二二極體D2、一第三二極體D3、一第四二極體D4、一第四電阻R4及一第三電晶體Q3。該第二電晶體Q2之汲極係連接至該電源端VCC,其閘極係連接至該電壓檢測電路30之訊號輸出端32,即該第一電晶體Q1的汲極。而該第二電晶體Q2之源極係連接至該第二二極體D2之陽極,該第二二極體D2之陰極係連接至該第二LED燈串20之第二輸入端21。該第三電晶體Q3之汲極連接至該第一LED燈串10之第一輸出端12,其閘極係透過該第四電阻R4連接至該第四二極體D4之陽極。該第四二極體D4之陰極係連接至該第二電晶體Q2之源極,而該第三電晶體Q3之源極連接至該第三二極體D3之陽極,該第三二極體D3之陰極係連接至該第二LED燈串20之第二輸出端22。至於該第三LED燈串42之第三輸入端421係連接至該第一LED燈串10之第一輸出端12,該第三LED燈串42之第三輸出端422係連接至該第二LED燈串20之第二輸入端21。The series-parallel control circuit 40 further has a second transistor Q2, a second diode D2, a third diode D3, a fourth diode D4, a fourth resistor R4 and a third battery. Crystal Q3. The drain of the second transistor Q2 is connected to the power terminal VCC, and the gate thereof is connected to the signal output terminal 32 of the voltage detecting circuit 30, that is, the drain of the first transistor Q1. The source of the second transistor Q2 is connected to the anode of the second diode D2, and the cathode of the second diode D2 is connected to the second input end 21 of the second LED string 20. The drain of the third transistor Q3 is connected to the first output terminal 12 of the first LED string 10, and the gate thereof is connected to the anode of the fourth diode D4 through the fourth resistor R4. The cathode of the fourth diode D4 is connected to the source of the second transistor Q2, and the source of the third transistor Q3 is connected to the anode of the third diode D3, the third diode The cathode of D3 is coupled to the second output 22 of the second LED string 20. The third input end 421 of the third LED string 42 is connected to the first output end 12 of the first LED string 10, and the third output end 422 of the third LED string 42 is connected to the second The second input 21 of the LED string 20.
請參閱圖3所示,本發明之第二較佳實施例與第一較佳實施例相比,係進一步設置有一定電流驅動電路50及一回授電路60。該定電流電路50係具有一電流控制端51及一檢測端52,該定電流控制端51係直接連接至該第二LED燈串20之第二輸出端22。該回授電路60係連接至該串並聯控制電路40中的第三電晶體Q3之閘極,且該回授電路60係根據該第三電晶體Q3之閘極電壓調整該回授電路60的等效電阻值。該定電流電路50之檢測端52係連接至該回授電路,並根據該檢測端52檢測該回授電路60的等效電阻值大小,控制流入該定電流控制端51的電流大小。在本較佳實施例中,該定電流驅動電路50係一積體電路,其型號為AT7315。Referring to FIG. 3, the second preferred embodiment of the present invention is further provided with a certain current driving circuit 50 and a feedback circuit 60 as compared with the first preferred embodiment. The constant current circuit 50 has a current control terminal 51 and a detection terminal 52. The constant current control terminal 51 is directly connected to the second output terminal 22 of the second LED light string 20. The feedback circuit 60 is connected to the gate of the third transistor Q3 in the series-parallel control circuit 40, and the feedback circuit 60 adjusts the feedback circuit 60 according to the gate voltage of the third transistor Q3. Equivalent resistance value. The detecting end 52 of the constant current circuit 50 is connected to the feedback circuit, and detects the magnitude of the equivalent resistance value of the feedback circuit 60 according to the detecting end 52, and controls the magnitude of the current flowing into the constant current control terminal 51. In the preferred embodiment, the constant current driving circuit 50 is an integrated circuit of the type AT7315.
且該適用不同電壓源之LED裝置還進一步設置有一第一整流單元70及一第二整流單元80。該第一整流單元70具有二交流電源端P1、P2及二直流輸出端,該二直流輸出端分別連接至該電源端VCC及該接地端GND,以提供直流電源。該第二整流單元80具有二交流電源端P3、P4及二直流輸出端,該二直流輸出端分別連接至該電源端VCC及該接地端GND,以提供直流電源。The LED device for different voltage sources is further provided with a first rectifying unit 70 and a second rectifying unit 80. The first rectifying unit 70 has two AC power terminals P1 and P2 and two DC output terminals. The two DC output terminals are respectively connected to the power terminal VCC and the ground terminal GND to provide DC power. The second rectifying unit 80 has two AC power terminals P3 and P4 and two DC output terminals. The two DC output terminals are respectively connected to the power terminal VCC and the ground terminal GND to provide DC power.
請一併參閱圖4所示,該適用不同電壓源之LED裝置可為一LED燈管90,而該LED燈管90之四個電源接腳即為該第一整流單元70及該第二整流單元80之交流電源端P1~P4。當使用該LED燈管90時,無論外接的交流電源由哪一隻接腳流入,都可以從其餘的三隻接腳中任一流出,且透過該第一整流單元70或該第二整流單元80將交流電源整流後提供給內部電路使用。使該LED燈管在使用時的接電方向不受限制,避免接電方向錯誤導致損壞或無法使用的情況發生。在本較佳實施例中,該第一整流單元70與該第二整流單元80皆為橋式整流器。As shown in FIG. 4, the LED device for different voltage sources may be an LED tube 90, and the four power pins of the LED tube 90 are the first rectifying unit 70 and the second rectifying unit. AC power terminals P1~P4 of unit 80. When the LED lamp 90 is used, no matter which pin the external AC power source flows in, it can flow out from any of the remaining three pins and pass through the first rectifying unit 70 or the second rectifying unit. The AC power is rectified and supplied to the internal circuit for use. The direction in which the LED tube is used during use is not limited, and the occurrence of damage or inability to use due to the wrong direction of the power supply is avoided. In the preferred embodiment, the first rectifying unit 70 and the second rectifying unit 80 are both bridge rectifiers.
請一併參閱圖5所示,該回授電路60係具有一第五電阻R5、一第六電阻R6、一第七電阻R7及一第四電晶體Q4。該第五電阻R5係連接於該定電流驅動電路50的檢測端52與該接地端GND之間。該第四電晶體Q4之汲極係透過該第六電阻R6連接至該定電流驅動電路50的檢測端52,其閘極係連接至該串並聯控制電路40第三電晶體Q3之閘極,而該第四電晶體Q4之源極係連接至該接地端GND。該第七電阻R7係連接於該第四電晶體Q4之閘極與該第四電晶體Q4之源極之間。As shown in FIG. 5, the feedback circuit 60 has a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and a fourth transistor Q4. The fifth resistor R5 is connected between the detecting end 52 of the constant current driving circuit 50 and the ground GND. The drain of the fourth transistor Q4 is connected to the detecting end 52 of the constant current driving circuit 50 through the sixth resistor R6, and the gate thereof is connected to the gate of the third transistor Q3 of the series-parallel control circuit 40. The source of the fourth transistor Q4 is connected to the ground GND. The seventh resistor R7 is connected between the gate of the fourth transistor Q4 and the source of the fourth transistor Q4.
以下僅以舉例方式說明電路運作情況,並非用以限定本發明之任何數值大小。The operation of the circuit will be described by way of example only and is not intended to limit any numerical size of the invention.
該電流檢測電路30的齊納二極體D1的崩潰電壓為13V,而該第一電阻R1與該第二電阻R2係將該電源端VCC的電壓進行分壓,以提供1/10的分壓至該第一電晶體Q1之閘極。The breakdown voltage of the Zener diode D1 of the current detecting circuit 30 is 13V, and the first resistor R1 and the second resistor R2 divide the voltage of the power terminal VCC to provide a partial voltage of 1/10. To the gate of the first transistor Q1.
請參閱圖6所示,當該電源端VCC的電壓值為100伏特(V)時,該第一電晶體Q1的閘極電壓係為該電源端VCC電壓值的1/10,為10V,但該齊納二極體D1的崩潰電壓為13V,當該齊納二極體D1逆向崩潰時,係提供13V至該第一電晶體Q1的源極。因此,該第一電晶體Q1的閘極-源極電壓為負值,故該第一電晶體Q1不導通,使該第二電晶體Q2的閘極電壓為該電源端VCC的電壓,為100V。Referring to FIG. 6, when the voltage value of the power supply terminal VCC is 100 volts (V), the gate voltage of the first transistor Q1 is 1/10 of the voltage value of the power terminal VCC, which is 10V, but The Zener diode D1 has a breakdown voltage of 13 V. When the Zener diode D1 collapses in the reverse direction, it supplies 13 V to the source of the first transistor Q1. Therefore, the gate-source voltage of the first transistor Q1 is a negative value, so the first transistor Q1 is not turned on, so that the gate voltage of the second transistor Q2 is the voltage of the power terminal VCC, which is 100V. .
該第二電晶體Q2的源極電壓即為該電源端VCC之電壓100V,因為該第二電晶體Q2的閘極與汲極電壓均為100V,且該第二電晶體Q2的源極係透過該第四二極體D4、該第四電阻R4與該第七電阻R7接地,故該第二電晶體Q2源極的初始狀態為0V,該第二電晶體Q2導通,讓電流得以流經該第二電晶體Q2的汲極與源極。當導通同時,因為該第二電晶體Q2具有汲極電流,進而透過該第四二極體D1的崩潰,以及該第四電阻R4與該第七電阻R7拉高該第二晶體Q2的源極電壓,而該第二電晶體Q2的源極電壓僅略小於該第二電晶體Q2的閘極電壓,約略小於100V,使該第二電晶體Q2作用於導通狀態(線性區域(Linear region))。The source voltage of the second transistor Q2 is 100V of the voltage of the power supply terminal VCC, because the gate and drain voltages of the second transistor Q2 are both 100V, and the source of the second transistor Q2 is transmitted through The fourth diode D4, the fourth resistor R4 and the seventh resistor R7 are grounded, so that the initial state of the source of the second transistor Q2 is 0V, and the second transistor Q2 is turned on, allowing current to flow through the The drain and source of the second transistor Q2. At the same time, because the second transistor Q2 has a drain current, and thus the breakdown of the fourth diode D1, and the fourth resistor R4 and the seventh resistor R7 pull the source of the second crystal Q2 Voltage, and the source voltage of the second transistor Q2 is only slightly smaller than the gate voltage of the second transistor Q2, which is approximately less than 100V, so that the second transistor Q2 acts on the conductive state (Linear region) .
該第一LED燈串10與該第二LED燈串20於正常運作下的跨壓為70V。該第一LED燈串10的第一輸出端12與該第二LED燈串20的第二輸出端的電壓均為30V,使該第三電晶體Q3的源極電壓為30V。而該第三電晶體Q3的閘極電壓係該第二電晶體Q2的源極電壓經過該第四電阻R4與該第七電阻R7產生的分壓,在本舉例說明中,該第四二極體D4的崩潰電壓為14V,且該第四電阻R4與該第七電阻R7之電阻值相同,使產生的分壓為(100-14)/2=43V。因此,該第三電晶體Q3的閘極電壓大於其源極電壓而導通,讓電流得以流經該第三電晶體Q3的汲極與源極。The first LED string 10 and the second LED string 20 have a voltage across the normal operation of 70V. The voltages of the first output terminal 12 of the first LED string 10 and the second output terminal of the second LED string 20 are both 30V, so that the source voltage of the third transistor Q3 is 30V. The gate voltage of the third transistor Q3 is a partial voltage generated by the source voltage of the second transistor Q2 through the fourth resistor R4 and the seventh resistor R7. In the illustrated example, the fourth diode The breakdown voltage of the body D4 is 14V, and the resistance value of the fourth resistor R4 and the seventh resistor R7 is the same, so that the generated partial pressure is (100-14)/2=43V. Therefore, the gate voltage of the third transistor Q3 is greater than its source voltage and is turned on, allowing current to flow through the drain and source of the third transistor Q3.
此外,該第四電晶體Q4之閘極電壓與該第三電晶體Q3的閘極電壓相同,皆為43V,且該第四電晶體Q4之源極接地,故該第四電晶體Q4導通,使該第五電阻R5與該第六電阻R6並聯。因此,該定電流驅動電路50的檢測端所檢測得到的該回授電路60的等效電阻值大小即為該第五電阻R5與該第六電阻R6並聯後的等效電阻,並控制流入該電流控制端51的電流大小為2I。因為該第一LED燈串10與該第二LED燈串20並聯,流入該電流控端51的電流為流經該第一LED燈串10與該第二LED燈串20的電流加總,而流經該第一LED燈串10與該第二LED燈串20的電流分別為I,故流入該電流控制端51的總電流須控制為2I,以避免大電流產生而損壞該第一LED燈串10與該第二LED燈串20。In addition, the gate voltage of the fourth transistor Q4 is the same as the gate voltage of the third transistor Q3, which is 43V, and the source of the fourth transistor Q4 is grounded, so the fourth transistor Q4 is turned on. The fifth resistor R5 is connected in parallel with the sixth resistor R6. Therefore, the equivalent resistance value of the feedback circuit 60 detected by the detection terminal of the constant current driving circuit 50 is the equivalent resistance of the fifth resistor R5 and the sixth resistor R6 in parallel, and the control flows into the The current of the current control terminal 51 is 2I. Because the first LED string 10 is connected in parallel with the second LED string 20, the current flowing into the current terminal 51 is the sum of the current flowing through the first LED string 10 and the second LED string 20. The current flowing through the first LED string 10 and the second LED string 20 is respectively I, so the total current flowing into the current control terminal 51 must be controlled to 2I to avoid large current generation and damage the first LED lamp. String 10 and the second LED string 20.
在該第二電晶體Q2與該第三電晶體Q3都導通的狀態下,使得該第一LED燈串10的第一輸出端11透過該第二電晶體Q2與該第二LED燈串20的第二輸出端12連接,且該第一LED燈串10的第一輸出端12透過該第三電晶體Q3與該第二LED燈串20的第二輸出端22連接,故該第一LED燈串10與該第二LED燈串20並聯,令該適用不同電壓源之LED裝置得以適用於100V之電源。The first output end 11 of the first LED string 10 is transmitted through the second transistor Q2 and the second LED string 20 in a state in which both the second transistor Q2 and the third transistor Q3 are turned on. The second output terminal 12 is connected, and the first output end 12 of the first LED string 10 is connected to the second output end 22 of the second LED string 20 through the third transistor Q3, so the first LED lamp The string 10 is connected in parallel with the second LED string 20, so that the LED device for different voltage sources can be applied to a 100V power source.
請參閱圖7所示,當該電源端VCC的電壓值為220V時,該第一電晶體Q1的閘極電壓為220V的1/10,為22V,而該齊納二極體D1的崩潰電壓為13V。因此,該第一電晶體Q1的閘極電壓大於其源極電壓,故該第一電晶體Q1導通,使該第二電晶體Q2的閘極電壓為該極納二極體D1的陰極電壓,為13V。Referring to FIG. 7, when the voltage value of the power supply terminal VCC is 220V, the gate voltage of the first transistor Q1 is 1/10 of 220V, which is 22V, and the breakdown voltage of the Zener diode D1. It is 13V. Therefore, the gate voltage of the first transistor Q1 is greater than the source voltage thereof, so that the first transistor Q1 is turned on, so that the gate voltage of the second transistor Q2 is the cathode voltage of the polar diode D1. It is 13V.
該第二電晶體Q2的源極電壓即為該電源端VCC之電壓220V,因為該第二電晶體Q2的閘極與汲極電壓均為220V,且該第二電晶體Q2的源極係透過該第四二極體D4、該第四電阻R4與該第七電阻R7接地,故該第二電晶體Q2源極的初始狀態為0V,該第二電晶體Q2導通,讓電流得以流經該第二電晶體Q2的汲極與源極。當導通同時,因為該第二電晶體Q2具有汲極電流,進而透過該第四二極體D4的崩潰,以及該第四電阻R4與該第七電阻R7拉高該第二晶體Q2的源極電壓,但該第二電晶體Q2的源極電壓僅略小於該第二電晶體Q2的閘極電壓,約略小於13V,使該第二電晶體Q2作用於導通狀態(飽和區域(Saturation region))。此時,因為該第二電晶體Q2的源極電壓略小於13V,使該第四二極體D4不至於崩潰導通,故該第四二極體D4不導通。The source voltage of the second transistor Q2 is 220V of the voltage of the power supply terminal VCC, because the gate and drain voltages of the second transistor Q2 are both 220V, and the source of the second transistor Q2 is transmitted through The fourth diode D4, the fourth resistor R4 and the seventh resistor R7 are grounded, so that the initial state of the source of the second transistor Q2 is 0V, and the second transistor Q2 is turned on, allowing current to flow through the The drain and source of the second transistor Q2. At the same time, because the second transistor Q2 has a drain current, and then the breakdown of the fourth diode D4, and the fourth resistor R4 and the seventh resistor R7 pull the source of the second crystal Q2 Voltage, but the source voltage of the second transistor Q2 is only slightly smaller than the gate voltage of the second transistor Q2, which is slightly less than 13V, so that the second transistor Q2 acts on the conduction state (Saturation region) . At this time, since the source voltage of the second transistor Q2 is slightly less than 13V, the fourth diode D4 is not collapsed and turned on, so the fourth diode D4 is not turned on.
該第一LED燈串10與該第二LED燈串20於正常運作下的跨壓為70V,而該第三LED燈串42於正常運作下的跨壓為50V。因此,該第一LED燈串10的第一輸出端12的電壓為該電源端VCC之電壓減去該第一LED燈串10所消耗的電壓,而得到該第一輸出端12的電壓為150V。該第三LED燈串42的第二輸出端422的電壓為該第一LED燈串10第一輸出端12的電壓減去該第三LED燈串42所消耗的電壓,而得到該第三輸出端422的電壓為100V。藉由該第二二極體D2的設置,該第三LED燈串42第三輸出端422的電壓即為該第二二極體D2的陰極電壓,為100V,而該第二電晶體Q2的源極電壓即為該第二二極體D2的陽極電壓,為13V,使該第二二極體D2因為反向偏壓而不導通,令該第三LED燈串42流出的電流直接流入該第二LED燈串20的第二輸入端21。The first LED string 10 and the second LED string 20 have a voltage across the normal operation of 70V, and the third LED string 42 has a voltage across the normal operation of 50V. Therefore, the voltage of the first output terminal 12 of the first LED string 10 is the voltage of the power terminal VCC minus the voltage consumed by the first LED string 10, and the voltage of the first output terminal 12 is 150V. . The voltage of the second output end 422 of the third LED string 42 is the voltage of the first output terminal 12 of the first LED string 10 minus the voltage consumed by the third LED string 42 to obtain the third output. The voltage at terminal 422 is 100V. With the second diode D2 disposed, the voltage of the third output terminal 422 of the third LED string 42 is the cathode voltage of the second diode D2, which is 100V, and the second transistor Q2 The source voltage is the anode voltage of the second diode D2, which is 13V, so that the second diode D2 is not turned on due to the reverse bias, so that the current flowing out of the third LED string 42 flows directly into the source. The second input 21 of the second LED string 20.
該第二LED燈串20的第二輸出端22的電壓為該第三LED燈串42第三輸出端422之電壓減去該第二LED燈串20所消耗的電壓,而得到該第二輸出端12的電壓為30V。而該第三電晶體Q3的源極電壓與該第二輸出端22的電壓相同,均為30V,但該第三電晶體Q3的閘極電壓因為該第四二極體D4不導通,且該第三電晶體Q3透過該第四電阻R4與該第七電阻R7接地,故該第三電晶體Q3的閘極電壓為0V,使該第三電晶體Q3的閘極電壓小於其源極電壓,而該第三電晶體Q3不導通。The voltage of the second output terminal 22 of the second LED string 20 is the voltage of the third LED 422 of the third LED string 42 minus the voltage consumed by the second LED string 20, and the second output is obtained. The voltage at terminal 12 is 30V. The source voltage of the third transistor Q3 is the same as the voltage of the second output terminal 22, which is 30V, but the gate voltage of the third transistor Q3 is not turned on because the fourth diode D4 is not The third transistor Q3 is grounded through the fourth resistor R4 and the seventh resistor R7, so that the gate voltage of the third transistor Q3 is 0V, so that the gate voltage of the third transistor Q3 is less than the source voltage thereof. The third transistor Q3 is not turned on.
此外,該第四電晶體Q4之閘極電壓與該第三電晶體Q3的閘極電壓相同,皆為0V,且該第四電晶體Q4之源極接地,故該第四電晶體Q4不導通,使該定電流驅動電路50的檢測端所檢測得到的該回授電路60的等效電阻值大小即為該第五電阻R5之電阻值,以控制流入該電流控制端51的電流大小為I。因為該第一LED燈串10、該第三LED燈串42以及該第二LED燈串20串聯,流入該電流控端51的電流即為流經該第一LED燈串10、該第三LED燈串42以及該第二LED燈串20的電流,故流入該電流控制端51的總電流須控制為I,以避免大電流產生而損壞該第一LED燈串10、該第三LED燈串42以及該第二LED燈串20。In addition, the gate voltage of the fourth transistor Q4 is the same as the gate voltage of the third transistor Q3, both of which are 0V, and the source of the fourth transistor Q4 is grounded, so the fourth transistor Q4 is not turned on. The magnitude of the equivalent resistance of the feedback circuit 60 detected by the detection terminal of the constant current driving circuit 50 is the resistance value of the fifth resistor R5 to control the magnitude of the current flowing into the current control terminal 51. . Because the first LED string 10, the third LED string 42 and the second LED string 20 are connected in series, the current flowing into the current terminal 51 flows through the first LED string 10 and the third LED. The current of the light string 42 and the second LED light string 20, so the total current flowing into the current control terminal 51 must be controlled to I to avoid large current generation and damage the first LED light string 10, the third LED light string 42 and the second LED string 20.
綜上所述,當該電源端VCC之電壓220V,流經該第一LED燈串10的電流I,係進一步流經該第三LED燈串42與該第二LED燈串20,達到令該第一、第二、第三LED燈串10、20、42串聯之目的,令該適用不同電壓源之LED裝置得以適用於220V之電源。該適用不同電壓源之LED裝置能同時適用於100V與220V二種不同且非為倍數關係之電源,且皆能正常發光,而當適用於220V的電源時,令該第三LED燈串42一起發光,以提供具有更佳亮度的光源。In summary, when the voltage of the power terminal VCC is 220V, the current I flowing through the first LED string 10 flows through the third LED string 42 and the second LED string 20 to achieve the The purpose of connecting the first, second, and third LED strings 10, 20, and 42 in series is to enable the LED device for different voltage sources to be applied to a 220V power supply. The LED device for different voltage sources can be applied to two different power sources of 100V and 220V, which are not in multiple relationship, and can normally emit light, and when applied to a 220V power supply, the third LED string 42 is together. Illuminate to provide a light source with better brightness.
以上所述僅是本發明的較佳實施例而已,並非對本發明做任何形式上的限制,雖然本發明已以較佳實施例揭露如上,然而並非用以限定本發明,任何熟悉本專業的技術人員,在不脫離本發明技術方案的範圍內,當可利用上述揭示的技術內容作出些許更動或修飾為等同變化的等效實施例,但凡是未脫離本發明技術方案的內容,依據本發明的技術實質對以上實施例所作的任何簡單修改、等同變化與修飾,均仍屬於本發明技術方案的範圍內。The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention. A person skilled in the art can make some modifications or modifications to equivalent embodiments by using the above-disclosed technical contents without departing from the technical scope of the present invention. It is still within the scope of the technical solution of the present invention to make any simple modifications, equivalent changes and modifications to the above embodiments.
10‧‧‧第一LED燈串
11‧‧‧第一輸入端
12‧‧‧第一輸出端
20‧‧‧第二LED燈串
21‧‧‧第二輸入端
22‧‧‧第二輸出端
30‧‧‧電壓檢測電路
31‧‧‧檢測端
32‧‧‧訊號輸出端
40‧‧‧串並聯控制電路
41‧‧‧訊號接收端
42‧‧‧第三LED燈串
421‧‧‧第三輸入端
422‧‧‧第三輸出端
50‧‧‧定電流驅動電路
51‧‧‧定電流控制端
52‧‧‧檢測端
60‧‧‧回授電路
70‧‧‧第一整流單元
80‧‧‧第二整流單元
90‧‧‧LED燈管10‧‧‧First LED light string
11‧‧‧ first input
12‧‧‧ first output
20‧‧‧Second LED light string
21‧‧‧second input
22‧‧‧second output
30‧‧‧Voltage detection circuit
31‧‧‧Detection
32‧‧‧Signal output
40‧‧‧Serial and parallel control circuit
41‧‧‧Signal Receiver
42‧‧‧ Third LED string
421‧‧‧ third input
422‧‧‧ third output
50‧‧‧Constant current drive circuit
51‧‧‧Constant current control terminal
52‧‧‧Detection
60‧‧‧Return circuit
70‧‧‧First rectification unit
80‧‧‧Secondary rectifier unit
90‧‧‧LED tube
圖1係本發明第一較佳實施例之方塊示意圖。 圖2係本發明第一較佳實施例之電路示意圖。 圖3係本發明第二較佳實施例之方塊示意圖。 圖4係本發明第二較佳實施例之外觀示意圖。 圖5係本發明第二較佳實施例之電路示意圖。 圖6係本發明第二較佳實施例適用於具第一電壓值之電源時之電流流向示意圖。 圖7係本發明第二較佳實施例適用於具第二電壓值之電源時之電流流向示意圖。1 is a block diagram of a first preferred embodiment of the present invention. 2 is a circuit diagram of a first preferred embodiment of the present invention. Figure 3 is a block diagram showing a second preferred embodiment of the present invention. Figure 4 is a schematic view showing the appearance of a second preferred embodiment of the present invention. Figure 5 is a circuit diagram showing a second preferred embodiment of the present invention. FIG. 6 is a schematic diagram of current flow when the second preferred embodiment of the present invention is applied to a power source having a first voltage value. FIG. 7 is a schematic diagram showing current flow when the second preferred embodiment of the present invention is applied to a power source having a second voltage value.
10‧‧‧第一LED燈串 10‧‧‧First LED light string
11‧‧‧第一輸入端 11‧‧‧ first input
12‧‧‧第一輸出端 12‧‧‧ first output
20‧‧‧第二LED燈串 20‧‧‧Second LED light string
21‧‧‧第二輸入端 21‧‧‧second input
22‧‧‧第二輸出端 22‧‧‧second output
30‧‧‧電壓檢測電路 30‧‧‧Voltage detection circuit
31‧‧‧檢測端 31‧‧‧Detection
32‧‧‧訊號輸出端 32‧‧‧Signal output
40‧‧‧串並聯控制電路 40‧‧‧Serial and parallel control circuit
41‧‧‧訊號接收端 41‧‧‧Signal receiving end
42‧‧‧第三LED燈串 42‧‧‧ Third LED string
421‧‧‧第三輸入端 421‧‧‧ third input
422‧‧‧第三輸出端 422‧‧‧ third output
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CN115035867A (en) * | 2022-07-20 | 2022-09-09 | 绵阳惠科光电科技有限公司 | Backlight driving circuit and method, backlight module and display device |
US11854501B1 (en) | 2022-07-20 | 2023-12-26 | Mianyang HKC Optoelectronics Technology Co., Ltd. | Backlight driving circut, backlight module and display device |
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CN115035867A (en) * | 2022-07-20 | 2022-09-09 | 绵阳惠科光电科技有限公司 | Backlight driving circuit and method, backlight module and display device |
US11854501B1 (en) | 2022-07-20 | 2023-12-26 | Mianyang HKC Optoelectronics Technology Co., Ltd. | Backlight driving circut, backlight module and display device |
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