TW201532475A - High power factor and high efficiency LED driving circuit - Google Patents
High power factor and high efficiency LED driving circuit Download PDFInfo
- Publication number
- TW201532475A TW201532475A TW103104834A TW103104834A TW201532475A TW 201532475 A TW201532475 A TW 201532475A TW 103104834 A TW103104834 A TW 103104834A TW 103104834 A TW103104834 A TW 103104834A TW 201532475 A TW201532475 A TW 201532475A
- Authority
- TW
- Taiwan
- Prior art keywords
- electrically connected
- voltage
- diode
- transistor
- capacitor
- Prior art date
Links
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
本發明係一種發光二極體的驅動電路，尤指一種適用於三端雙向交流開關(triode for alternating current；TRIAC)調光器的高功因高效率的發光二極體驅動電路。The invention relates to a driving circuit of a light-emitting diode, in particular to a high-efficiency light-emitting diode driving circuit suitable for a triode for alternating current (TRIAC) dimmer.
一種交流型發光二極體(AC-LED)，其直接與市電電連接即可工作，但現有技術的AC-LED的缺點係當輸入電壓產生微幅變化時就會使AC-LED的電流產生大幅的影響，而當流經AC-LED的電流過大時會產生衰退效應(droopeffect)，造成發光效率降低。再者，AC-LED為了要承受較高的輸入電壓峰值，而需有較高的導通電壓，並進一步造成較低的功率因數。An AC type light-emitting diode (AC-LED) that works directly with a commercial power supply, but the disadvantage of the prior art AC-LED is that the current of the AC-LED is generated when the input voltage is slightly changed. A large effect, when the current flowing through the AC-LED is too large, will produce a droop effect, resulting in reduced luminous efficiency. Furthermore, in order to withstand higher input voltage peaks, AC-LEDs require higher turn-on voltages and further lower power factor.
請參閱圖4所示，現有技術中有一種發光二極體(LED)驅動裝置，其係用於驅動一LED 70，具有一箝制電路50與一整流電路60，該箝制電路50係設置於一交流電源80與該整流電路60之間，並分別電連接至該交流電源80之一端及該整流電路60的其中一輸入端。該整流電路60的另一輸入端係電連接至該交流電源80的另一端，以將該交流電源80提供的交流電整流成直流電後輸出至該LED 70，使該LED 70取得電能而發光。請參閱圖5所示，該箝制電路係於輸入電源的電壓超過一臨界值時，將流經該箝制電路的電流箝制於該臨界電壓對應的臨界電流，以避免因流經該LED 70的電流峰值過大而產生衰退效應影響發光效率，如圖5所示，當電流到達200毫安培時，該箝制電路即將電流箝制於200毫安培，使電流不會再隨著輸入電壓的增加而上升。但現有技術的驅動裝置係直接於電壓過大時將電流限流，但使用此一方式並無法有效的增加功率因數。Referring to FIG. 4, there is a light emitting diode (LED) driving device for driving an LED 70, having a clamping circuit 50 and a rectifying circuit 60. The clamping circuit 50 is disposed on a The AC power source 80 and the rectifier circuit 60 are electrically connected to one end of the AC power source 80 and one of the input terminals of the rectifier circuit 60, respectively. The other input end of the rectifier circuit 60 is electrically connected to the other end of the AC power source 80 to rectify the AC power provided by the AC power source 80 into DC power and output the LED 70 to the LED 70 to cause the LED 70 to obtain electric energy to emit light. Referring to FIG. 5, the clamping circuit clamps the current flowing through the clamping circuit to a critical current corresponding to the threshold voltage when the voltage of the input power exceeds a threshold to avoid current flowing through the LED 70. If the peak value is too large and the fading effect affects the luminescence efficiency, as shown in Fig. 5, when the current reaches 200 mA, the clamp circuit clamps the current at 200 mA, so that the current does not rise with the increase of the input voltage. However, the prior art driving device limits the current directly when the voltage is too large, but using this method does not effectively increase the power factor.
此外，若該LED 70係使用一TRIAC調光器來調整光源的亮暗時，若該TRIAC調光器的導通角度太小，且導通時的電壓峰值不足該LED70的導通電壓，而該LED70無法導通以產生光源，如此一來，該TRIAC調光器便無法於小導通角度時調整該LED70的發光強度，故現有技術有必要作進一步之改良。In addition, if the LED 70 uses a TRIAC dimmer to adjust the brightness of the light source, if the conduction angle of the TRIAC dimmer is too small, and the voltage peak during the conduction is less than the ON voltage of the LED 70, the LED 70 cannot Turning on to generate the light source, the TRIAC dimmer can not adjust the luminous intensity of the LED 70 at a small conduction angle, so further improvements are needed in the prior art.
有鑑於前述現有技術的無法有效提高功率因數的缺點，本發明的主要目的係提供一種適用於TRIAC調光器的高功因高效率之發光二極體(LED)驅動電路，既可用來將交流電源的電流峰值限制於一臨界電流以下，亦可同時提高功率因數，使電源提供的電能更有效的被運用，且能於該TRIAC調光器的導通角度小時驅動LED發光。In view of the above disadvantages of the prior art that the power factor cannot be effectively improved, the main object of the present invention is to provide a high-efficiency, high-efficiency light-emitting diode (LED) driving circuit suitable for a TRIAC dimmer, which can be used for AC communication. The current peak of the power supply is limited to a critical current, and the power factor can be increased at the same time, so that the power provided by the power source can be more effectively used, and the LED can be driven to emit light when the conduction angle of the TRIAC dimmer is small.
為達到上述目的，本發明所採用的技術手段係令該高功因高效率之LED驅動電路係用於驅動一LED模組，該LED驅動電路包含有：一雙向限流電路，係電連接至一交流電源之一端； 一整流電路，係包含有一第一及第二輸入端、一正端及一負端，其中該第一輸入端電連接至該雙向限流電路，該第二輸入端電連接至該交流電源之另一端，該正端係電連接至該LED模組之正極，該負端係電連接至該LED模組之負極；及一電容串，包括相互串接的一第一電容及一第二電容，該第一、第二電容係以其串接節點與該整流電路之第二輸入端連接，相對於串接節點的另端則分別連接整流電路之正、負端。In order to achieve the above object, the technical means adopted by the present invention is to enable the high-efficiency LED driving circuit to drive an LED module. The LED driving circuit includes: a bidirectional current limiting circuit electrically connected to a rectifying circuit includes a first and a second input end, a positive end and a negative end, wherein the first input end is electrically connected to the bidirectional current limiting circuit, and the second input end is electrically Connected to the other end of the AC power source, the positive end is electrically connected to the positive pole of the LED module, the negative end is electrically connected to the negative pole of the LED module; and a capacitor string includes a first one connected in series The capacitor and the second capacitor are connected to the second input end of the rectifier circuit by a serial connection node thereof, and are connected to the positive and negative ends of the rectifier circuit respectively with respect to the other end of the serial connection node.
當該交流電源於正半周，輸入電壓通過該整流電路對該第一電容進行充電，該第一電容之跨壓隨著輸入電壓的絕對值增加而充電，以達到輸入電壓的電壓峰值，之後便隨著輸入電壓絕對值的減少而放電。當該第一電容的跨壓下降至小於該LED模組的導通電壓時，該LED模組因跨壓不足其導通電壓，則使該LED模組形成斷路而關閉，如此該第一電容便無法再繼續放電使其跨壓被維持在略低於該LED模組導通電壓的電壓值。當該交流電源於負半周，輸入電壓通過該整流電路對該第二電容充電，且該第二電容的跨壓隨著輸入電壓的絕對值增加而充電，以達到輸入電壓的電壓峰值，因為該LED模組的跨壓係該第一電容與第二電容的疊加跨壓，且該第一電容的跨壓因為該LED模組的導通電壓而維持在該導通電壓，並未完全放電，故當第二電容隨著該交流電源的負半周開始充電時，該第一電容與第二電容的疊加跨壓便超過了該LED模組的導通電壓，使該LED模組可以導通而發光，且第一電容便可繼續放電，而該第一電容會在該第二電容的跨壓達到該交流電源的電壓峰值之前放電完畢，因此該LED模組的跨壓並不會超過該交流電源的電壓峰值，故不會具有倍壓效果使LED模組產生過大電流而造成衰退效應。When the AC power source is in the positive half cycle, the input voltage is charged to the first capacitor through the rectifier circuit, and the voltage across the first capacitor is charged as the absolute value of the input voltage increases to reach the voltage peak of the input voltage, and then Discharges as the absolute value of the input voltage decreases. When the voltage across the first capacitor drops to less than the turn-on voltage of the LED module, the LED module is turned off due to insufficient voltage across the LED module, so that the first capacitor cannot be turned off. The discharge is continued until the voltage across the voltage is maintained at a voltage slightly lower than the turn-on voltage of the LED module. When the AC power source is in a negative half cycle, the input voltage charges the second capacitor through the rectifier circuit, and the voltage across the second capacitor is charged as the absolute value of the input voltage increases to reach a voltage peak of the input voltage, because The voltage across the LED module is a superimposed voltage across the first capacitor and the second capacitor, and the voltage across the first capacitor is maintained at the turn-on voltage due to the turn-on voltage of the LED module, and is not completely discharged. When the second capacitor starts to charge with the negative half cycle of the AC power source, the superimposed voltage across the first capacitor and the second capacitor exceeds the turn-on voltage of the LED module, so that the LED module can be turned on and emit light, and the first capacitor A capacitor can continue to discharge, and the first capacitor discharges before the voltage across the voltage of the second capacitor reaches the peak value of the AC power source, so the voltage across the LED module does not exceed the voltage peak of the AC power source. Therefore, there is no double voltage effect that causes the LED module to generate excessive current and cause a decay effect.
進一步而言，該雙向限流電路可將該交流電源的電流峰值限制於一臨界電流值之下，若該交流電源的電流峰值超過該臨界電流值時，流經該雙向限流電路後，而進入該LED模組的電流即是該臨界電流，避免該LED模組產生衰退效應，並提高該LED模組的發光效率。如此一來，即便該交流電源的電流峰值過大，亦不會影響該LED模組，使LED模組不會因為過大的電流而燒毀或產生衰退效應。此外亦可避免在利用TRIAC調光時，因輸入電壓的驟變而造成瞬間大電流在第一及第二電容上，進而避免產生蜂鳴聲及降低電容的使用壽命。Further, the bidirectional current limiting circuit can limit the current peak value of the AC power source to a critical current value, and if the current peak value of the AC power source exceeds the critical current value, after flowing through the bidirectional current limiting circuit, The current entering the LED module is the critical current, which avoids the degradation effect of the LED module and improves the luminous efficiency of the LED module. In this way, even if the current peak of the AC power source is too large, the LED module will not be affected, so that the LED module will not burn out due to excessive current or cause a fading effect. In addition, when TRIAC dimming is used, an instantaneous large current is generated on the first and second capacitors due to sudden changes in the input voltage, thereby avoiding buzzing and reducing the service life of the capacitor.
本發明係利用該第一電容與第二電容的充放電功能，使提供至該LED模組之電源，於該交流電源提供的跨壓係低電壓時，產生一疊加效應，該LED模組的跨壓係該第一電容與第二電容的跨壓疊加，讓該LED模組的跨壓於交流電源的電壓尚未到達該LED模組的導通電壓時，即可藉由電容的疊加效應而導通，使該LED模組提早發光，以達到增加功率因數之目的。進一步而言，本發明係適用於一TRIAC調光器，當該TRIAC調光器的導通角度太小而導致導通時的電壓峰值不足該LED模組的導通電壓時，利用該第一電容與該第二電容的跨壓疊加，增加TRIAC調光器可適用於該LED模組的導通角度，使其可於導通角度小時即可調整該LED模組的亮暗。The present invention utilizes the charge and discharge functions of the first capacitor and the second capacitor to cause a power supply to the LED module to generate a superposition effect when the cross voltage is low voltage provided by the AC power source, and the LED module is The voltage across the first capacitor and the second capacitor across the voltage system is superimposed, so that the voltage across the AC power source of the LED module does not reach the conduction voltage of the LED module, and the voltage is superimposed by the superposition effect of the capacitor. The LED module is illuminated early to achieve the purpose of increasing the power factor. Further, the present invention is applicable to a TRIAC dimmer, and when the conduction angle of the TRIAC dimmer is too small to cause the voltage peak when the conduction is insufficient to be lower than the ON voltage of the LED module, the first capacitance and the The voltage across the second capacitor is superimposed, and the TRIAC dimmer can be applied to the conduction angle of the LED module, so that the brightness and darkness of the LED module can be adjusted when the conduction angle is small.
以下配合圖式及本發明之較佳實施例，進一步闡述本發明為達成預定目的所採取的技術手段。The technical means adopted by the present invention for achieving the intended purpose are further explained below in conjunction with the drawings and preferred embodiments of the present invention.
請參閱圖1所示，本發明的高功因高效率之發光二極體(LED)驅動電路係適用於TRIAC調光器40並可用於驅動一LED模組70，且該LED驅動電路係電連接於該TRIAC調光器40與該LED模組70之間，而該TRIAC調光器40係電連接至一交流電源80的一端。該LED驅動電路包含有一雙向限流電路10、一整流電路20一電容串，該電容串係包含有互相串接的一第一電容C1及一第二電容C2。Referring to FIG. 1 , the high-efficiency light-emitting diode (LED) driving circuit of the present invention is applicable to the TRIAC dimmer 40 and can be used to drive an LED module 70, and the LED driving circuit is electrically Connected between the TRIAC dimmer 40 and the LED module 70, the TRIAC dimmer 40 is electrically connected to one end of an AC power source 80. The LED driving circuit includes a bidirectional current limiting circuit 10, a rectifying circuit 20, and a capacitor string. The capacitor string includes a first capacitor C1 and a second capacitor C2 connected in series.
該雙向限流電路10電連接至該TRIAC調光器40，用以限制流經的電流峰值，使其不超過一臨界電流值。該整流電路20係包含有一第一及一第二輸入端n1、n2、一正端A及一負端C。該第一輸入端n1電連接至該雙向限流電路10，該第二輸入端n2電連接至該交流電源80之另一端，該正端A電連接至該LED模組70之正極，該負端C電連接至該LED模組之負極。The bidirectional current limiting circuit 10 is electrically coupled to the TRIAC dimmer 40 for limiting the peak current flowing through it so as not to exceed a critical current value. The rectifier circuit 20 includes a first and a second input terminals n1, n2, a positive terminal A and a negative terminal C. The first input terminal n1 is electrically connected to the bidirectional current limiting circuit 10, and the second input terminal n2 is electrically connected to the other end of the AC power source 80. The positive terminal A is electrically connected to the anode of the LED module 70. The terminal C is electrically connected to the negative pole of the LED module.
在本較佳實施例中，該雙向限流電路10係包含有一第一電晶體Q1、一第二電晶體Q2、一第一電阻R1及二二極體ZD1、ZD2。該第一電晶體Q1之汲極係電連接至該TRIAC調光器40之輸出端，其源極電連接至該第二電晶體Q2之閘極，其閘極電連接至該第二電晶體Q2之源極。該第二電晶體Q2之汲極係電連接至該整流電路20的第一輸入端n1。該第一電阻R1係電連接於該第一電晶體Q1的源極與該第二電晶體Q2的源極之間。該二二極體ZD1、ZD2係以陰極相互電連接，且該二二極體ZD1、ZD2之陽極係分別電連接至該第一電晶體Q1的源極及該第二電晶體Q2的源極。在本較佳實施例中，該第一及第二電晶體Q1、Q2均係空乏型N型-金屬氧化物半導體場效電晶體，該二二極體ZD1、ZD2均係稽納二極體。In the preferred embodiment, the bidirectional current limiting circuit 10 includes a first transistor Q1, a second transistor Q2, a first resistor R1, and two diodes ZD1, ZD2. The drain of the first transistor Q1 is electrically connected to the output end of the TRIAC dimmer 40, the source thereof is electrically connected to the gate of the second transistor Q2, and the gate thereof is electrically connected to the second transistor. The source of Q2. The drain of the second transistor Q2 is electrically connected to the first input terminal n1 of the rectifier circuit 20. The first resistor R1 is electrically connected between the source of the first transistor Q1 and the source of the second transistor Q2. The diodes ZD1 and ZD2 are electrically connected to each other by a cathode, and the anodes of the diodes ZD1 and ZD2 are electrically connected to the source of the first transistor Q1 and the source of the second transistor Q2, respectively. . In the preferred embodiment, the first and second transistors Q1 and Q2 are both depleted N-type metal oxide semiconductor field effect transistors, and the dipoles ZD1 and ZD2 are both Jenus diodes. .
該交流電源80提供的交流電電流係流經該雙向限流電路10的第一電晶體Q1、該第一電阻R1及該第二電晶體Q2。當電流流經該第一電阻R1時，即會產生一壓差，而此壓差會提供給該第一電晶體Q1或該第二電晶體Q2一為負值的閘極-源極壓差，使該第一電晶體Q1或該第二電晶體Q2進入飽和區，而達到限流之目的，讓該LED模組70不會產生衰退效應，以提高該LED模組的發光效率。該第一電晶體Q1或該第二電晶體Q2進入飽和區之後的汲極電流即係該臨界電流。The alternating current supplied from the alternating current power source 80 flows through the first transistor Q1, the first resistor R1 and the second transistor Q2 of the bidirectional current limiting circuit 10. When a current flows through the first resistor R1, a voltage difference is generated, and the differential pressure is supplied to the gate-source voltage difference of the first transistor Q1 or the second transistor Q2. The first transistor Q1 or the second transistor Q2 enters the saturation region to achieve the purpose of current limiting, so that the LED module 70 does not have a decay effect, thereby improving the luminous efficiency of the LED module. The threshold current after the first transistor Q1 or the second transistor Q2 enters the saturation region is the critical current.
在本較佳實施例中，該整流電路20係一橋式整流電路，其包含有一第一、第二、第三、第四二極體D1、D2、D3、D4，該第一二極體D1之陽極電連接至該雙向限流電路10之第二電晶體Q2之汲極，該第一二極體D1之陰極係電連接至該第二二極體D2之陰極。該第二二極體D2之陽極係電連接至該第四二極體D4之陰極。該第三二極體D3之陽極電連接至該第四二極體D4之陽極，該第三二極體D3之陰極電連接至該第一二極體D1之陽極。該第一二極體D1之陽極係該整流電路20之第一輸入端n1，該第二二極體D2之陽極係該整流電路20的第二輸入端n2。該第二二極體D2之陰極係該整流電路20的正端A，該第四二極體D4之陽極係該整流電路20的負端C。In the preferred embodiment, the rectifier circuit 20 is a bridge rectifier circuit including a first, second, third, and fourth diodes D1, D2, D3, and D4, and the first diode D1. The anode is electrically connected to the drain of the second transistor Q2 of the bidirectional current limiting circuit 10, and the cathode of the first diode D1 is electrically connected to the cathode of the second diode D2. The anode of the second diode D2 is electrically connected to the cathode of the fourth diode D4. The anode of the third diode D3 is electrically connected to the anode of the fourth diode D4, and the cathode of the third diode D3 is electrically connected to the anode of the first diode D1. The anode of the first diode D1 is the first input terminal n1 of the rectifier circuit 20, and the anode of the second diode D2 is the second input terminal n2 of the rectifier circuit 20. The cathode of the second diode D2 is the positive terminal A of the rectifier circuit 20, and the anode of the fourth diode D4 is the negative terminal C of the rectifier circuit 20.
該串接電容之第一、第二電容C1、C2之串接節點係與該整流電路20之第二輸入端n2連接，而相對於串接節點的另端則分別連接整流電路20之正、負端A、C。The series connection node of the first and second capacitors C1 and C2 of the series capacitor is connected to the second input terminal n2 of the rectifier circuit 20, and the other end of the series connection node is connected to the rectifier circuit 20, Negative terminals A, C.
本發明還進一步包含有一假性負載31、一保險絲32及一突波吸收器，該假性負載31包含有一第二電阻R2及一第三電阻R3，該第二電阻R2與該第三電阻R3相互串連後電連接至該雙向限流電路10的第一電晶體Q1的汲極及該整流電路20的第二輸入端n2，以提供一固定電流給該TRIAC調光器40，該固定電流即為該TRIAC調光器40的維持電流，避免該TRIAC調光器40進入截止狀態，來增加該TRIAC調光器40的調光順暢度。該保險絲32係電連接於該第一電晶體Q1的汲極與該TRIAC調光器40之間，當有過大的電流流入該驅動電路時，即形成斷路來保護該驅動電路。該突波吸收器33係電連接於該交流電源80之兩端，以吸收雷極之類的電壓突波，防止電壓突波進入該驅動電路。The present invention further includes a dummy load 31, a fuse 32 and a surge absorber. The dummy load 31 includes a second resistor R2 and a third resistor R3. The second resistor R2 and the third resistor R3 Connected to each other in series to be electrically connected to the drain of the first transistor Q1 of the bidirectional current limiting circuit 10 and the second input terminal n2 of the rectifier circuit 20 to provide a fixed current to the TRIAC dimmer 40, the fixed current That is, the sustain current of the TRIAC dimmer 40 prevents the TRIAC dimmer 40 from entering an off state to increase the dimming smoothness of the TRIAC dimmer 40. The fuse 32 is electrically connected between the drain of the first transistor Q1 and the TRIAC dimmer 40. When an excessive current flows into the driving circuit, an open circuit is formed to protect the driving circuit. The surge absorber 33 is electrically connected to both ends of the AC power source 80 to absorb a voltage surge such as a lightning pole to prevent a voltage surge from entering the drive circuit.
請參閱圖2及圖3所示，藉由該第一電容C1與該第二電容C2的設置，當該交流電源80提供的交流電於正半周，該交流電流經該雙向限流電路10及該整流電路20而流入該LED模組70之正極，並由經該LED模組70之負極，由該整流電路20的第二輸入端n2流出，回流至該交流電源80，此時，該第一電容C1兩端之跨壓即為該交流電之電壓，且於該交流電的電壓絕對值係增加時，該第一電容C1隨著該交流電的電壓絕對值增加而充電，當該交流電之電壓絕對值達到該交流電之電壓峰值後，電壓絕對值開始下降，此時，該第一電容C1便開始放電。當該第一電容C1的電壓放電至小於該LED模組的導通電壓時，該LED模組70則因跨壓不足其導通電壓而形成斷路，此時該第一電容C1便無法再繼續放電並使其跨壓值為略低於該LED模組70導通電壓的電壓值。Referring to FIG. 2 and FIG. 3 , when the first capacitor C1 and the second capacitor C2 are disposed, when the alternating current power supplied by the alternating current power source 80 is in the positive half cycle, the alternating current flows through the bidirectional current limiting circuit 10 and the The rectifier circuit 20 flows into the anode of the LED module 70, and flows out through the second input terminal n2 of the rectifier circuit 20 through the cathode of the LED module 70, and flows back to the AC power source 80. At this time, the first The voltage across the capacitor C1 is the voltage of the alternating current, and when the absolute value of the alternating current voltage increases, the first capacitor C1 is charged as the absolute value of the alternating current voltage increases, and the absolute value of the alternating current voltage After the voltage peak of the alternating current is reached, the absolute value of the voltage begins to decrease. At this time, the first capacitor C1 starts to discharge. When the voltage of the first capacitor C1 is discharged to be less than the turn-on voltage of the LED module, the LED module 70 is disconnected due to insufficient voltage across the turn-on voltage. At this time, the first capacitor C1 cannot continue to discharge. The voltage across the voltage is slightly lower than the voltage of the LED module 70.
當該交流電源80提供的交流電於負半周時，該交流電流經該整流電路20而流入該LED模組70之正極，並經由該LED模組70之負極，由該整流電路20的第一輸入端n1流出，並流經該雙向限流電路10而回流至該交流電源80，此時，該第二電容C2兩端之跨壓即為該交流電源80之電壓，且於該交流電的電壓絕對值係增加時，該第二電容C2隨著該交流電的電壓絕對值增加而充電，而該LED模組70之跨壓係為該第一電容C1與該第二電容C2的疊加跨壓，當該第二電容C2開始充電，使該第一電容C1與該第二電容C2的疊加跨壓超過該LED模組70的導通電壓時，該LED模組70即可導通而發光，且該第一電容C1即可繼續放電，直至放電完畢。而該第一電容C1會在該第二電容C2充電至該交流電的電壓峰值前放電完畢，因此該LED模組的跨壓並不會超過該交流電的電壓峰值，故該第一電容C1與該第二電容C2之疊加跨壓不會具有倍壓效果，而使該LED模組的跨壓過高產生過大電流而造成衰退效應。When the alternating current provided by the alternating current power source 80 is in the negative half cycle, the alternating current flows into the anode of the LED module 70 through the rectifier circuit 20, and passes through the cathode of the LED module 70, and the first input of the rectifier circuit 20 The terminal n1 flows out and flows through the bidirectional current limiting circuit 10 to return to the AC power source 80. At this time, the voltage across the second capacitor C2 is the voltage of the AC power source 80, and the voltage of the AC power is absolutely When the value is increased, the second capacitor C2 is charged as the absolute value of the alternating current voltage increases, and the voltage across the LED module 70 is the superimposed crossover between the first capacitor C1 and the second capacitor C2. When the second capacitor C2 starts to be charged, and the superimposed voltage of the first capacitor C1 and the second capacitor C2 exceeds the conduction voltage of the LED module 70, the LED module 70 can be turned on to emit light, and the first Capacitor C1 can continue to discharge until the discharge is completed. The first capacitor C1 is discharged before the second capacitor C2 is charged to the peak value of the alternating current. Therefore, the voltage across the LED module does not exceed the voltage peak of the alternating current, so the first capacitor C1 and the capacitor C1 The superimposed voltage across the second capacitor C2 does not have a double voltage effect, and the excessive voltage across the LED module generates excessive current and causes a decay effect.
當該交流電之電壓絕對值達到該交流電之電壓峰值後，該電壓絕對值開始下降，該第二電容C2便開始放電，但此時該第一電容C1已經放電完畢，因此該第二電容C2與該第一電容C1放電時相同，即係該第二電容C2放電至其跨壓略低於該LED模組70的導通電壓值時，停止繼續放電，直至該交流電回到正半周時，對該第一電容C1開始充電，使該第一、第二電容C1、C2的疊加跨壓超過該LED模組70的導通電壓，該第二電容C2便可繼續放電，直至放電完畢。該第二電容C2與該第一電容C1相同，即係會在該第一電容C1充電至該交流電的電壓峰值前放電完畢，使該第一電容C1與該第二電容C2的疊加跨壓不具有倍壓的效果。When the absolute value of the voltage of the alternating current reaches the peak value of the alternating current voltage, the absolute value of the voltage begins to decrease, and the second capacitor C2 starts to discharge, but at this time, the first capacitor C1 has been discharged, so the second capacitor C2 and When the first capacitor C1 is discharged, the second capacitor C2 is discharged until the voltage across the LED module 70 is slightly lower than the on-voltage value of the LED module 70, and the discharge is stopped until the alternating current returns to the positive half cycle. The first capacitor C1 starts to be charged, so that the superimposed voltage of the first and second capacitors C1 and C2 exceeds the conduction voltage of the LED module 70, and the second capacitor C2 can continue to discharge until the discharge is completed. The second capacitor C2 is the same as the first capacitor C1, that is, the discharge is completed before the first capacitor C1 is charged to the peak value of the alternating current, so that the superposition of the first capacitor C1 and the second capacitor C2 does not overlap. It has the effect of double pressure.
但該第一電容C1與該第二電容C2於該交流電的電壓絕對值係低電壓時，會產生電壓疊加的效果，使該LED模組70能於該交流電的電壓絕對值不足其導通電壓時，可透過該第一電容C1與該第二電容C2的電壓疊加，使該LED模組70的跨壓超過其導通電壓而導通，讓該LED模組70能提早導通。藉由此方式即可增加該LED模組70的導通時間，進而提高功率因數。且本發明還具有該雙向限流電路10，以限制該交流電的電流峰值不超過該臨界電流，以避免該LED模組70產生衰退效應。However, when the first capacitor C1 and the second capacitor C2 are at a low voltage of the absolute value of the alternating current, a voltage superposition effect is generated, so that the LED module 70 can be used when the absolute value of the alternating current voltage is less than the turn-on voltage. The voltage of the first capacitor C1 and the second capacitor C2 are superimposed to make the voltage across the LED module 70 exceed its turn-on voltage, so that the LED module 70 can be turned on early. In this way, the on-time of the LED module 70 can be increased, thereby improving the power factor. Moreover, the present invention further has the bidirectional current limiting circuit 10 to limit the current peak of the alternating current not exceeding the critical current to avoid the LED module 70 from generating a fading effect.
進一步而言，本發明係適用於該TRIAC調光器40，當該TRIAC調光器40的導通角度太小而導致導通時的電壓峰值不足該LED模組70的導通電壓時，利用該第一電容C1與該第二電容C2的跨壓疊加，增加該TRIAC調光器40可適用於該LED模組70的導通角度，使其可於導通角度小時即可調整該LED模組70的亮暗。Further, the present invention is applicable to the TRIAC dimmer 40. When the conduction angle of the TRIAC dimmer 40 is too small to cause the voltage peak when the conduction is insufficient to be lower than the ON voltage of the LED module 70, the first The voltage across the capacitor C1 and the second capacitor C2 is superimposed, and the TRIAC dimmer 40 can be applied to the conduction angle of the LED module 70, so that the brightness and darkness of the LED module 70 can be adjusted when the conduction angle is small. .
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，雖然本發明已較佳實施例揭露如上，然而並非用以限定本發明，任何所屬技術領域中具有通常知識者，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 preferred embodiments of the present invention are disclosed above, the present invention is not limited thereto, and is generally Those skilled in the art can make some modifications or modifications to equivalent embodiments using the above-disclosed technical contents without departing from the technical scope of the present invention, but the present invention does not deviate from the technical solution of the present invention. Technical Substantials Any simple modifications, equivalent changes and modifications made to the above embodiments are still within the scope of the technical solutions of the present invention.
10‧‧‧雙向限流電路
20‧‧‧整流電路
31‧‧‧假性負載
32‧‧‧保險絲
33‧‧‧突波吸收器
40‧‧‧TRIAC調光器
50‧‧‧箝制電路
60‧‧‧整流電路
70‧‧‧LED模組
80‧‧‧交流電源10‧‧‧Bidirectional current limiting circuit
20‧‧‧Rectifier circuit
31‧‧‧false load
32‧‧‧Fuse
33‧‧‧ surge absorber
40‧‧‧TRIAC dimmer
50‧‧‧Clamping circuit
60‧‧‧Rectifier circuit
70‧‧‧LED module
80‧‧‧AC power supply
圖1係本發明較佳實施例之電路圖。圖2係本發明較佳實施例的輸入電壓與二電容跨壓的波形圖。圖3係本發明較佳實施例的輸入與輸出電壓波形圖。圖4係現有技術LED驅動裝置之電路圖。圖5係現有技術輸入電壓與輸入電流之波形圖。BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a circuit diagram of a preferred embodiment of the present invention. 2 is a waveform diagram of an input voltage and a two-capacitor voltage across a preferred embodiment of the present invention. 3 is a waveform diagram of input and output voltages in accordance with a preferred embodiment of the present invention. 4 is a circuit diagram of a prior art LED driving device. Figure 5 is a waveform diagram of a prior art input voltage and input current.
10‧‧‧雙向限流電路 10‧‧‧Bidirectional current limiting circuit
20‧‧‧整流電路 20‧‧‧Rectifier circuit
31‧‧‧假性負載 31‧‧‧false load
32‧‧‧保險絲 32‧‧‧Fuse
33‧‧‧突波吸收器 33‧‧‧ surge absorber
40‧‧‧TRIAC調光器 40‧‧‧TRIAC dimmer
70‧‧‧LED模組 70‧‧‧LED module
80‧‧‧交流電源 80‧‧‧AC power supply
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW103104834A TW201532475A (en) | 2014-02-14 | 2014-02-14 | High power factor and high efficiency LED driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW103104834A TW201532475A (en) | 2014-02-14 | 2014-02-14 | High power factor and high efficiency LED driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| TW201532475A true TW201532475A (en) | 2015-08-16 |
Family
ID=54343264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW103104834A TW201532475A (en) | 2014-02-14 | 2014-02-14 | High power factor and high efficiency LED driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| TW (1) | TW201532475A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI631875B (en) * | 2016-09-20 | 2018-08-01 | 日商松下知識產權經營股份有限公司 | Protection circuit of dimming device and dimming device |
-
2014
- 2014-02-14 TW TW103104834A patent/TW201532475A/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI631875B (en) * | 2016-09-20 | 2018-08-01 | 日商松下知識產權經營股份有限公司 | Protection circuit of dimming device and dimming device |
| US10708989B2 (en) | 2016-09-20 | 2020-07-07 | Panasonic Intellectual Property Management Co., Ltd. | Protection circuit for dimmer, and dimmer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5632664B2 (en) | Semiconductor light-emitting element lighting device and lighting fixture using the same | |
| CN103269537B (en) | Multi-circuit current-limiting power supplying circuit, controlling method thereof and current-limiting power supplying method thereof | |
| WO2018040119A1 (en) | Led light source drive control device for providing compatibility with mains electricity and input of ballast | |
| US8872434B2 (en) | Constant-current-drive LED module device | |
| US10172192B2 (en) | LED lamp single live wire intelligent control apparatus | |
| KR101171042B1 (en) | Light emitting device driving circuit | |
| US11528791B2 (en) | Driving circuit | |
| CN104797037B (en) | Low-flicker light-emitting diode lighting device having multiple driving stages | |
| CN201995169U (en) | Driving power supply of high-power LED (light-emitting diode) street lamp | |
| US20150366022A1 (en) | Alternating current rectifying circuit and alternating current rectifying method for driving led module | |
| CN103096595B (en) | Light emitting diode (LED) drive circuit | |
| CN204392656U (en) | LED drive circuit and LED switch driving power | |
| EP2914064A1 (en) | Drive circuit and illumination device comprising the drive circuit | |
| CN205071365U (en) | Emitting diode lighting drive circuit and lamps and lanterns | |
| US10440785B2 (en) | Current holding circuit for bidirectional triode thyristor dimmer and linear dimming driving circuit using the same | |
| CN104822203A (en) | LED surge protection circuit based on voltage dependent resistors | |
| CN208424843U (en) | A kind of LED linear constant-current circuit with Ripple Suppression and dimming function | |
| TW201532475A (en) | High power factor and high efficiency LED driving circuit | |
| CN205336586U (en) | Lighting circuit and remote controller | |
| CN104918360B (en) | A kind of comprehensive protection circuit of LED power | |
| CN103200735A (en) | Light-emitting diode (LED) actuator preventing LED from flickering | |
| CN203289708U (en) | A multi-loop current-limiting power supply circuit | |
| US10595370B2 (en) | LED lamp and driver circuit for LED light source | |
| CN104822192A (en) | LED energy-saving lamp lightning protection drive circuit | |
| CN104822193A (en) | Anti-surge LED drive circuit based on voltage-stabilizing diode |