TWI439169B - Light emitting diode driving circuit - Google Patents
Light emitting diode driving circuit Download PDFInfo
- Publication number
- TWI439169B TWI439169B TW100124346A TW100124346A TWI439169B TW I439169 B TWI439169 B TW I439169B TW 100124346 A TW100124346 A TW 100124346A TW 100124346 A TW100124346 A TW 100124346A TW I439169 B TWI439169 B TW I439169B
- Authority
- TW
- Taiwan
- Prior art keywords
- signal
- coupled
- voltage
- output
- driving circuit
- Prior art date
Links
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Dc-Dc Converters (AREA)
Description
本提案係提供一種發光二極體驅動電路,特別關於一種非隔離式的發光二極體驅動電路。The present invention provides a light emitting diode driving circuit, and more particularly to a non-isolated light emitting diode driving circuit.
於照明裝置方面,由於發光二極體與一般發光源相比較,發光二極體具有壽命長、耗電量低、不易損壞等優點,使得發光二極體成為人類在研究開發與生活應用方面的重要對象。然而,發光二極體需要直流電源來驅動,因此當發光二極體應用於接收交流電源時,則需要發光二極體驅動電路將交流電源轉換為直流電源,以驅動發光二極體發光。In terms of lighting devices, since the light-emitting diodes have advantages of long life, low power consumption, and low damage, the light-emitting diodes have become human beings in research and development and life applications. Important object. However, the light emitting diode needs to be driven by a DC power source. Therefore, when the light emitting diode is applied to receive AC power, the LED driving circuit is required to convert the AC power into a DC power source to drive the LED to emit light.
目前市面上的交流-直流轉換器(AC-DC converter)無論是採用非隔離式或是隔離式的架構,通常係藉由控制電路驅動開關電晶體,以將輸入的交流電源進行高頻調變,再經由電感與電容所組成的濾波電路加以整流濾波為直流電源輸出至負載端。在交流電源剛輸入交流-直流轉換器時,交流-直流轉換器尚未運作,通常需要藉由啟動電路提供啟動電壓予控制電路,以使控制電路啟動開關電晶體,進而使交流-直流轉換器開始運作。當交流-直流轉換器開始運作後,再藉由交流-直流轉換器的輸出端提供額外的電力予控制電路。At present, the AC-DC converter on the market adopts a non-isolated or isolated architecture, usually by driving a switching transistor through a control circuit to perform high-frequency modulation of the input AC power source. Then, the filter circuit composed of the inductor and the capacitor is rectified and filtered to output the DC power to the load terminal. When the AC power supply is just input to the AC-DC converter, the AC-DC converter is not yet in operation, and it is usually necessary to provide a starting voltage to the control circuit by the starting circuit, so that the control circuit activates the switching transistor, thereby starting the AC-DC converter. Operation. When the AC-DC converter starts operating, additional power is supplied to the control circuit through the output of the AC-DC converter.
習知啟動電路係由功率電阻所構成,因此於控制電路被啟動電路啟動後,啟動電路不能主動停止,而造成功率的持續消耗,進而無法符合低待機電力要求。為了達到低待機電力的要求,業者提出一種具高壓電流源的啟動電路。當控制電路未被啟動時,利用主動開關產生高壓定電流源以啟動控制電路,並對儲能電容充電;當控制電路被啟動後,將高壓定電流源關閉,以減少功率損耗。雖然現有的技術已可使交流-直流轉換器達到低待機電力的要求,但是具高壓電流源的啟動電路需增加許多元件,除了使交流-直流轉換器的製作成本提高之外,也使交流-直流轉換器的體積增加。The conventional starting circuit is composed of a power resistor. Therefore, after the control circuit is started by the starting circuit, the starting circuit cannot be actively stopped, and the power is continuously consumed, thereby failing to meet the low standby power requirement. In order to meet the requirements of low standby power, the manufacturer proposes a starting circuit with a high voltage current source. When the control circuit is not activated, the active switch is used to generate a high voltage constant current source to start the control circuit and charge the storage capacitor; when the control circuit is started, the high voltage constant current source is turned off to reduce power loss. Although the existing technology has enabled the AC-DC converter to achieve low standby power requirements, the startup circuit with a high-voltage current source requires a large number of components, in addition to increasing the manufacturing cost of the AC-DC converter, and also enables AC- The volume of the DC converter is increased.
鑒於以上問題,本提案提出一種發光二極體驅動電路,藉以解決先前技術所存在的問題。In view of the above problems, the present proposal proposes a light-emitting diode driving circuit to solve the problems of the prior art.
依據本提案所揭露之發光二極體驅動電路的一實施例,發光二極體驅動電路包括一輸入電源電路、一發光二極體串列、一昇壓轉換器、一回授電阻與一控制電路。發光二極體串列包括N個發光二極體與一分壓端點,N個發光二極體係以串聯的方式耦接,分壓端點配置於第k個發光二極體與第k+1個發光二極體之間,其中N≧2,k+1≦N。昇壓轉換器包括一開關電晶體。輸入電源電路用以輸出一電流信號,昇壓轉換器依據電流信號輸出一驅動信號,以驅動發光二極體串列。回授電阻依據驅動信號或開關電晶體所輸出的一第一信號而輸出一回授信號,其中,回授信號為一電壓信號。分壓端點耦接控制電路,發光二極體串列藉由分壓端點提供一啟動電壓予控制電路,使得控制電路依據回授信號輸出一脈衝寬度調變(Pulse Width Modulation,PWM)信號,以選擇性地啟動或關閉開關電晶體。其中,啟動電壓大於或等於控制電路的一工作電壓。According to an embodiment of the LED driving circuit disclosed in the present proposal, the LED driving circuit includes an input power circuit, a LED array, a boost converter, a feedback resistor and a control. Circuit. The LED array includes N light-emitting diodes and a voltage dividing end point, N light-emitting diode systems are coupled in series, and the voltage dividing end is disposed in the k-th light-emitting diode and the k+th Between one light-emitting diode, where N ≧ 2, k +1 ≦ N. The boost converter includes a switching transistor. The input power circuit is configured to output a current signal, and the boost converter outputs a driving signal according to the current signal to drive the LED array. The feedback resistor outputs a feedback signal according to a driving signal or a first signal outputted by the switching transistor, wherein the feedback signal is a voltage signal. The voltage dividing end is coupled to the control circuit, and the LED array provides a starting voltage to the control circuit by the voltage dividing end point, so that the control circuit outputs a Pulse Width Modulation (PWM) signal according to the feedback signal. To selectively activate or deactivate the switching transistor. Wherein, the starting voltage is greater than or equal to an operating voltage of the control circuit.
依據本提案所揭露之發光二極體驅動電路的一實施例,發光二極體驅動電路包括一輸入電源電路、一發光二極體串列、一昇壓轉換器、一回授電阻與一控制電路。發光二極體串列包括N個發光二極體與一分壓端點,N個發光二極體係以串聯的方式耦接,分壓端點配置於第k個發光二極體與第k+1個發光二極體之間,其中N≧2,k+1≦N。昇壓轉換器包括一電源輸入端、一電源輸出端、一開關電晶體與一輸出電容,電源輸入端耦接輸入電源電路,電源輸出端耦接發光二極體串列與輸出電容。回授電阻選擇性地耦接發光二極體串列、配置於N個發光二極體之間或耦接開關電晶體。分壓端點耦接控制電路,控制電路耦接開關電晶體。According to an embodiment of the LED driving circuit disclosed in the present proposal, the LED driving circuit includes an input power circuit, a LED array, a boost converter, a feedback resistor and a control. Circuit. The LED array includes N light-emitting diodes and a voltage dividing end point, N light-emitting diode systems are coupled in series, and the voltage dividing end is disposed in the k-th light-emitting diode and the k+th Between one light-emitting diode, where N ≧ 2, k +1 ≦ N. The boost converter includes a power input end, a power output end, a switch transistor and an output capacitor, the power input end is coupled to the input power circuit, and the power output end is coupled to the LED array and the output capacitor. The feedback resistor is selectively coupled to the LED array, disposed between the N LEDs, or coupled to the switching transistor. The voltage dividing end is coupled to the control circuit, and the control circuit is coupled to the switching transistor.
昇壓轉換器依據輸入電源電路所輸出的一電流信號對輸出電容充電,當輸出電容的電壓大於導通發光二極體串列所需的電壓時,輸出一驅動信號以驅動發光二極體串列。發光二極體串列藉由分壓端點提供一啟動電壓予控制電路,使得控制電路依據回授信號輸出一脈衝寬度調變(Pulse Width Modulation,PWM)信號,以選擇性地啟動或關閉開關電晶體。其中,啟動電壓大於或等於控制電路的一工作電壓。回授電阻選擇性地依據驅動信號或開關電晶體所輸出的一第一信號而輸出一回授信號,其中,回授信號為一電壓信號。The boost converter charges the output capacitor according to a current signal outputted by the input power circuit. When the voltage of the output capacitor is greater than the voltage required to turn on the LED array, a driving signal is output to drive the LED array. . The LED array provides a starting voltage to the control circuit through the voltage dividing end, so that the control circuit outputs a Pulse Width Modulation (PWM) signal according to the feedback signal to selectively activate or deactivate the switch. Transistor. Wherein, the starting voltage is greater than or equal to an operating voltage of the control circuit. The feedback resistor selectively outputs a feedback signal according to a driving signal or a first signal outputted by the switching transistor, wherein the feedback signal is a voltage signal.
依據本提案所揭露之發光二極體驅動電路,適用以驅動發光二極體串列。可藉由發光二極體串列的分壓端點設計,使得發光二極體驅動電路不必藉由習知啟動電路即可啟動控制電路。再者,可依據不同控制電路所需的工作電壓範圍調整分壓端點的位置,以使得啟動電壓大於或等於控制電度的工作電壓。According to the LED driving circuit disclosed in the proposal, the LED array is driven to drive the LED. The voltage-dividing end point design of the LED array can be used to enable the LED driving circuit to start the control circuit without the conventional starting circuit. Furthermore, the position of the voltage dividing end point can be adjusted according to the operating voltage range required by the different control circuits such that the starting voltage is greater than or equal to the operating voltage of the control power.
以上關於本提案的內容說明及以下之實施方式的說明係用以示範及解釋本提案的精神及原理,並且提供本提案的專利申請範圍更進一步的解釋。The above description of the contents of this proposal and the following description of the implementation are used to demonstrate and explain the spirit and principle of this proposal, and provide a further explanation of the scope of patent application of this proposal.
請參照「第1圖」,係為依據本提案所揭露之發光二極體驅動電路的第一實施例電路結構示意圖。在本實施例中,發光二極體驅動電路100係為非隔離式發光二極體驅動電路,且包括輸入電源電路102、發光二極體串列104、昇壓轉換器106、回授電阻108與控制電路110,昇壓轉換器106包括電源輸入端107、電源輸出端109、開關電晶體60與輸出電容98。其中,電源輸入端107耦接輸入電源電路102,電源輸出端109耦接發光二極體串列104與輸出電容98的一端,輸出電容98的另一端接地。回授電阻108的一端與發光二極體串列104耦接,回授電阻108的另一端接地。Please refer to FIG. 1 , which is a schematic diagram of the circuit structure of the first embodiment of the LED driving circuit disclosed in the present proposal. In this embodiment, the LED driving circuit 100 is a non-isolated LED driving circuit, and includes an input power circuit 102, a LED array 104, a boost converter 106, and a feedback resistor 108. And the control circuit 110, the boost converter 106 includes a power input 107, a power output 109, a switching transistor 60, and an output capacitor 98. The power input terminal 107 is coupled to the input power circuit 102. The power output terminal 109 is coupled to one end of the LED array 104 and the output capacitor 98, and the other end of the output capacitor 98 is grounded. One end of the feedback resistor 108 is coupled to the LED array 104, and the other end of the feedback resistor 108 is grounded.
在本實施例中,發光二極體串列104可包括但不限於六十個發光二極體20與分壓端點P,六十個發光二極體20係以串聯的方式耦接,分壓端點P可配置但不限於第五十四個發光二極體20與第五十五個發光二極體20之間,但本實施例並非用以限定本提案。換句話說,發光二極體串列104亦可包括二十個發光二極體20,分壓端點P可配置但不限於第四個發光二極體20與第五個發光二極體20之間,可依據實際需求進行調整。其中,為簡化「第1圖」的圖式,發光二極體串列104所包括發光二極體20的數量僅繪製出五個表示。In this embodiment, the LED array 104 can include, but is not limited to, sixty LEDs 20 and a voltage dividing terminal P, and sixty LEDs 20 are coupled in series. The voltage terminal P can be configured, but not limited to, between the fifty-fourth light-emitting diode 20 and the fifty-fifth light-emitting diode 20, but this embodiment is not intended to limit the present proposal. In other words, the LED array 104 can also include twenty LEDs 20, and the voltage dividing terminal P can be configured, but not limited to the fourth LED 20 and the fifth LED 20 Between, it can be adjusted according to actual needs. Here, in order to simplify the drawing of "FIG. 1", only the five representations of the number of the light-emitting diodes 20 included in the LED array 104 are shown.
其中,輸入電源電路102可包括但不限於交流信號源90與橋式整流器92。交流信號源90耦接橋式整流器92,使得橋式整流器92可接收交流信號源90所輸出的交流信號Vac ,並進行整流程序後而輸出電流信號IC ,其中交流信號Vac 係為電壓信號。昇壓轉換器106另可包括第一電感94與第一二極體96。第一電感94的一端耦接輸入電源電路102,第一電感94的另一端耦接第一二極體96的輸入端961,輸出電容98的一端與發光二極體串列104分別耦接第一二極體96的輸出端962。The input power circuit 102 can include, but is not limited to, an AC signal source 90 and a bridge rectifier 92. The AC signal source 90 is coupled to the bridge rectifier 92, so that the bridge rectifier 92 can receive the AC signal V ac outputted by the AC signal source 90 and perform a rectification process to output a current signal I C , wherein the AC signal V ac is a voltage. signal. The boost converter 106 can further include a first inductor 94 and a first diode 96. One end of the first inductor 94 is coupled to the input power supply circuit 102. The other end of the first inductor 94 is coupled to the input end 961 of the first diode 96. One end of the output capacitor 98 is coupled to the LED array 104. The output 962 of a diode 96.
發光二極體驅動電路100另可包括第二二極體62,開關電晶體60可為但不限於場效電晶體(Field Effect Transistor,FET)。在本實施例中,開關電晶體60可為N型通道金氧半場效電晶體(N-channel Metal-Oxide-Semiconductor Field Effect Transistor,N-MOSFET),但本實施例並非用以限定本提案。舉例而言,開關電晶體60亦可為P型通道金氧半場效電晶體。其中,第二二極體62的輸入端621耦接場效電晶體的源極S,第二二極體62的輸出端622耦接場效電晶體的汲極D,控制電路110耦接場效電晶體的閘極G,但本實施例並非用以限制本提案。舉例而言,開關電晶體60亦可為雙極接面電晶體(Bipolar Junction Transistor,BJT),第二二極體62的輸入端621耦接雙極接面電晶體的集極C,第二二極體62的輸出端622耦接雙極接面電晶體的射極E,控制電路110耦接雙極接面電晶體的基極B(如「第2圖」所示,「第2圖」係為依據本提案所揭露之發光二極體驅動電路的第二實施例電路結構示意圖)。其中,當開關電晶體60為關閉狀態時,第二二極體62係可用以防止第一電感94所產生的反電動勢損害開關電晶體60,進而保護開關電晶體60。The LED driving circuit 100 may further include a second diode 62. The switching transistor 60 may be, but not limited to, a Field Effect Transistor (FET). In the present embodiment, the switching transistor 60 can be an N-channel Metal-Oxide-Semiconductor Field Effect Transistor (N-MOSFET), but this embodiment is not intended to limit the proposal. For example, the switching transistor 60 can also be a P-channel gold oxide half field effect transistor. The input end 621 of the second diode 62 is coupled to the source S of the field effect transistor, the output end 622 of the second diode 62 is coupled to the drain D of the field effect transistor, and the control circuit 110 is coupled to the field. The gate G of the effect transistor, but this embodiment is not intended to limit the proposal. For example, the switching transistor 60 can also be a Bipolar Junction Transistor (BJT). The input end 621 of the second diode 62 is coupled to the collector C of the bipolar junction transistor. The output end 622 of the diode 62 is coupled to the emitter E of the bipolar junction transistor, and the control circuit 110 is coupled to the base B of the bipolar junction transistor (as shown in FIG. 2, "Fig. 2 The schematic diagram of the circuit structure of the second embodiment of the LED driving circuit disclosed in the present proposal). Wherein, when the switching transistor 60 is in the off state, the second diode 62 can be used to prevent the counter electromotive force generated by the first inductor 94 from damaging the switching transistor 60, thereby protecting the switching transistor 60.
請參照「第3圖」,係為「第1圖」之控制電路的一實施例電路結構示意圖。控制電路110可包括三角波產生器202、參考電壓Vref 、第一比較器204、第二比較器206、電壓感測器208、脈衝寬度調變產生器210與驅動器212。第一比較器204包括第一正輸入端2041、第一負輸入端2042與第一輸出端2043,第一正輸入端2041耦接參考電壓Vref ,第一負輸入端2042接收回授信號IFB 。第二比較器206包括第二正輸入端2061、第二負輸入端2062與第二輸出端2063,第二正輸入端2061耦接第一輸出端2043,第二負輸入端2062耦接三角波產生器202。第二輸出端2063與電壓感測器208的一端分別耦接脈衝寬度調變產生器210,電壓感測器208的另一端耦接分壓端點P(請參照「第1圖」),脈衝寬度調變產生器210耦接驅動器212,驅動器212耦接場效電晶體的閘極G(請參照「第1圖」)。Please refer to "FIG. 3", which is a schematic diagram of the circuit structure of an embodiment of the control circuit of "FIG. 1". The control circuit 110 can include a triangular wave generator 202, a reference voltage Vref , a first comparator 204, a second comparator 206, a voltage sensor 208, a pulse width modulation generator 210, and a driver 212. The first comparator 204 includes a first positive input terminal 2041, a first negative input terminal 2042 and a first output terminal 2043. The first positive input terminal 2041 is coupled to the reference voltage V ref , and the first negative input terminal 2042 receives the feedback signal I . FB . The second comparator 206 includes a second positive input 2061, a second negative input 2062 and a second output 2063. The second positive input 2061 is coupled to the first output 2043, and the second negative input 2062 is coupled to the triangular wave. 202. The second output end 2063 and one end of the voltage sensor 208 are respectively coupled to the pulse width modulation generator 210, and the other end of the voltage sensor 208 is coupled to the voltage dividing end point P (refer to "1"), pulse The width modulation generator 210 is coupled to the driver 212, and the driver 212 is coupled to the gate G of the field effect transistor (refer to FIG. 1).
請參照「第1圖」與「第3圖」,當輸入電源電路102剛輸出電流信號IC 時,控制電路110未被啟動且昇壓轉換器106未開始運作,電流信號IC 係對輸出電容98充電。當輸出電容98的電壓大於導通發光二極體串列104的電壓時,輸出驅動信號ID 以驅動發光二極體串列104。回授電阻108依據驅動信號ID 輸出回授信號IFB 至控制電路110。其中,回授信號IFB 為電壓信號。發光二極體串列104藉由分壓端點P提供啟動電壓VS 予控制電路110,當啟動電壓VS 大於或等於控制電路110的工作電壓VDD 時,第一比較器204比較回授信號IFB 與參考電壓Vref 的大小而輸出第一比較信號ICOMP1 至第二比較器206,第二比較器206比較第一比較信號ICOMP1 與三角波產生器202所輸出三角波信號ITRI 的大小而輸出第二比較信號ICOMP2 至脈衝寬度調變產生器210。電壓感測器208因判斷啟動電壓VS 大於或等於工作電壓VDD 而輸出感測信號Ise 至脈衝寬度調變產生器210。脈衝寬度調變產生器210依據感測信號Ise 與第二比較信號ICOMP2 輸出致動信號IEN 至驅動器212,驅動器212依據致動信號IEN 輸出脈衝寬度調變信號IPWM ,以選擇性地啟動或關閉開關電晶體60,進而調整驅動發光二極體串列104的驅動信號ID 之大小。Referring to "1" and "3", when the input power supply circuit 102 just outputs the current signal I C , the control circuit 110 is not activated and the boost converter 106 does not start operating, and the current signal I C is output. Capacitor 98 is charged. When the voltage of the output capacitor 98 is greater than the voltage of the LED array 104, the drive signal I D is output to drive the LED array 104. The feedback resistor 108 outputs the feedback signal I FB to the control circuit 110 according to the driving signal I D . The feedback signal I FB is a voltage signal. The LED array 104 provides a startup voltage V S to the control circuit 110 by the voltage dividing terminal P. When the startup voltage V S is greater than or equal to the operating voltage V DD of the control circuit 110, the first comparator 204 compares the feedback signals. The number I FB and the reference voltage V ref output a first comparison signal I COMP1 to the second comparator 206, and the second comparator 206 compares the size of the first comparison signal I COMP1 with the triangular wave signal I TRI output by the triangular wave generator 202 The second comparison signal I COMP2 is output to the pulse width modulation generator 210. The voltage sensor 208 outputs the sensing signal I se to the pulse width modulation generator 210 by determining that the startup voltage V S is greater than or equal to the operating voltage V DD . The pulse width modulation generator 210 outputs an actuation signal I EN to the driver 212 according to the sensing signal I se and the second comparison signal I COMP2 , and the driver 212 outputs a pulse width modulation signal I PWM according to the actuation signal I EN to selectively The switch transistor 60 is activated or deactivated to adjust the magnitude of the drive signal I D that drives the LED array 104.
舉例而言,單一個發光二極體20的順向電壓可為但不限於3伏特(Voltage,V),當單一個發光二極體20接收約0.7~0.9倍的順向電壓(約2.1~2.7伏特)時,單一個發光二極體20開始導通。以下係以單一個發光二極體20接收約0.8倍的順向電壓(約2.4伏特)即開始導通為例。在本實施例中,由於發光二極體20的數量為六十個,故發光二極體串列104需接收144伏特才可導通。因此,當輸出電容98的電壓大於144伏特時,發光二極體串列104才可被驅動,進而使發光二極體串列104提供大於或等於工作電壓VDD 的啟動電壓VS 予控制電路110。需注意的是,由於不同的控制電路具有不同的工作電壓,故分壓端點P可依據控制電路110所具有的工作電壓VDD 調整位置。其中,發光二極體串列104藉由分壓端點P所提供的啟動電壓係為驅動發光二極體串列104的分壓(即Vo_normal ×(Nlow /Ntotal ),其中Vo_normal 係為大於或等於導通發光二極體串列104的電壓之輸出電容的電壓,Nlow 係為自分壓端點P至發光二極體串列104的接地端之間發光二極體20的數量,Ntotal 係為發光二極體串列104中發光二極體20的數量)。For example, the forward voltage of a single LED 20 can be, but is not limited to, 3 volts (Vage), when a single LED 20 receives a forward voltage of about 0.7 to 0.9 times (about 2.1~). At 2.7 volts, a single light-emitting diode 20 begins to conduct. The following is an example in which a single light-emitting diode 20 receives a forward voltage (about 2.4 volts) of about 0.8 times, that is, the conduction is started. In this embodiment, since the number of the light emitting diodes 20 is sixty, the light emitting diode series 104 needs to receive 144 volts to be turned on. Therefore, when the voltage of the output capacitor 98 is greater than 144 volts, the LED array 104 can be driven, thereby causing the LED array 104 to provide a startup voltage V S greater than or equal to the operating voltage V DD to the control circuit. 110. It should be noted that since different control circuits have different operating voltages, the voltage dividing end point P can be adjusted according to the operating voltage V DD of the control circuit 110. The starting voltage of the LED array 104 by the voltage dividing terminal P is the driving voltage of the driving diode series 104 (ie, V o_normal ×(N low /N total ), where V o_normal The voltage is greater than or equal to the voltage of the output capacitor that turns on the voltage of the LED array 104, and N low is the number of the light-emitting diodes 20 from the voltage-dividing end point P to the ground terminal of the LED series 104. N total is the number of the light-emitting diodes 20 in the light-emitting diode series 104).
在本實施例中,控制電路110可為但不限於型號為L6561的控制電路,且型號為L6561的控制電路所需的工作電壓介於12伏特至20伏特之間。當輸出電容98的電壓等於144伏特時,發光二極體串列104所提供的啟動電壓VS 為144×(6/60)伏特(即14.4伏特)。此時,啟動電壓VS 大於型號為L6561的控制電路所需的工作電壓,故控制電路110被啟動,而昇壓轉換器106開始運作。In the present embodiment, the control circuit 110 can be, but is not limited to, a control circuit of the type L6561, and the control circuit of the model L6561 requires an operating voltage of between 12 volts and 20 volts. When the voltage of the output capacitor 98 is equal to 144 volts, the threshold voltage V S provided by the LED array 104 is 144 x (6/60) volts (i.e., 14.4 volts). At this time, the startup voltage V S is greater than the operating voltage required by the control circuit of the model L6561, so the control circuit 110 is activated and the boost converter 106 starts operating.
請參照「第4圖」,係為依據本提案所揭露之發光二極體驅動電路的第三實施例電路結構示意圖。發光二極體驅動電路100係為非隔離式發光二極體驅動電路,且包括輸入電源電路102、發光二極體串列104、昇壓轉換器106、回授電阻108與控制電路110,昇壓轉換器106包括電源輸入端107、電源輸出端109、開關電晶體60與輸出電容98。其中,電源輸入端107耦接輸入電源電路102,電源輸出端109耦接發光二極體串列104與輸出電容98的一端,輸出電容98的另一端接地。分壓端點P耦接控制電路110,控制電路110耦接開關電晶體60。Please refer to FIG. 4, which is a schematic diagram of the circuit structure of the third embodiment of the LED driving circuit disclosed in the present proposal. The LED driving circuit 100 is a non-isolated LED driving circuit, and includes an input power circuit 102, a LED array 104, a boost converter 106, a feedback resistor 108, and a control circuit 110. The voltage converter 106 includes a power input 107, a power output 109, a switching transistor 60, and an output capacitor 98. The power input terminal 107 is coupled to the input power circuit 102. The power output terminal 109 is coupled to one end of the LED array 104 and the output capacitor 98, and the other end of the output capacitor 98 is grounded. The voltage dividing terminal P is coupled to the control circuit 110, and the control circuit 110 is coupled to the switching transistor 60.
在本實施例中,發光二極體驅動電路100除了回授電阻108的配置位置以及控制電路110的架構與第一實施例不同外,更包括第二電感302與偵測電阻304。回授電阻108的一端與昇壓轉換器106耦接,回授電阻108的另一端與發光二極體串列104的一端耦接,發光二極體串列104的另一端接地。第二電感302的一端接地,第二電感302的另一端耦接偵測電阻304的一端,偵測電阻304的另一端耦接控制電路110。In this embodiment, the LED driving circuit 100 further includes a second inductor 302 and a detecting resistor 304 in addition to the configuration position of the feedback resistor 108 and the structure of the control circuit 110. One end of the feedback resistor 108 is coupled to the boost converter 106, the other end of the feedback resistor 108 is coupled to one end of the LED array 104, and the other end of the LED array 104 is grounded. One end of the second inductor 302 is grounded, the other end of the second inductor 302 is coupled to one end of the detecting resistor 304, and the other end of the detecting resistor 304 is coupled to the control circuit 110.
請參照「第5圖」,係為「第4圖」之控制電路的一實施例電路結構示意圖。控制電路110可包括三角波產生器202、參考電壓Vref 、第一比較器204、第二比較器206、電壓感測器208、脈衝寬度調變產生器210與驅動器212。第一比較器204包括第一正輸入端2041、第一負輸入端2042與第一輸出端2043,第一正輸入端2041耦接參考電壓Vref ,第一負輸入端2042接收回授信號IFB 。第二比較器206包括第二正輸入端2061、第二負輸入端2062與第二輸出端2063,第二正輸入端2061耦接第一輸出端2043,第二負輸入端2062耦接三角波產生器202。第二輸出端2063與電壓感測器208的一端分別耦接脈衝寬度調變產生器210,電壓感測器208的另一端耦接分壓端點P(請參照「第1圖」),脈衝寬度調變產生器210耦接驅動器212,驅動器212耦接場效電晶體的閘極G(請參照「第1圖」)。Please refer to "figure 5", which is a schematic diagram of the circuit structure of an embodiment of the control circuit of "Fig. 4". The control circuit 110 can include a triangular wave generator 202, a reference voltage Vref , a first comparator 204, a second comparator 206, a voltage sensor 208, a pulse width modulation generator 210, and a driver 212. The first comparator 204 includes a first positive input terminal 2041, a first negative input terminal 2042 and a first output terminal 2043. The first positive input terminal 2041 is coupled to the reference voltage V ref , and the first negative input terminal 2042 receives the feedback signal I . FB . The second comparator 206 includes a second positive input 2061, a second negative input 2062 and a second output 2063. The second positive input 2061 is coupled to the first output 2043, and the second negative input 2062 is coupled to the triangular wave. 202. The second output end 2063 and one end of the voltage sensor 208 are respectively coupled to the pulse width modulation generator 210, and the other end of the voltage sensor 208 is coupled to the voltage dividing end point P (refer to "1"), pulse The width modulation generator 210 is coupled to the driver 212, and the driver 212 is coupled to the gate G of the field effect transistor (refer to FIG. 1).
在本實施例中,控制電路110除了包括「第3圖」的架構外,更包括零電流偵測器211。零電流偵測器211的一端耦接偵測電阻304(請參照「第4圖」),零電流偵測器211的另一端耦接脈衝寬度調變產生器210。In the present embodiment, the control circuit 110 includes a zero current detector 211 in addition to the architecture of "FIG. 3". One end of the zero current detector 211 is coupled to the detecting resistor 304 (refer to FIG. 4), and the other end of the zero current detector 211 is coupled to the pulse width modulation generator 210.
請參照「第4圖」與「第5圖」,當輸入電源電路102剛輸出電流信號IC 時,控制電路110未被啟動且昇壓轉換器106未開始運作,電流信號IC 係對輸出電容98充電。當輸出電容98的電壓大於導通發光二極體串列104的電壓時,輸出驅動信號ID 以驅動發光二極體串列104。回授電阻108依據驅動信號ID 輸出回授信號IFB 至控制電路110。其中,回授信號IFB 為電壓信號。第二電感302係用以偵測流經第一電感94的電流信號IC 而輸出偵測信號IQ 至控制電路110的零電流偵測器211。Referring to "Fig. 4" and "Fig. 5", when the input power supply circuit 102 has just output the current signal I C , the control circuit 110 is not activated and the boost converter 106 is not operating, and the current signal I C is output. Capacitor 98 is charged. When the voltage of the output capacitor 98 is greater than the voltage of the LED array 104, the drive signal I D is output to drive the LED array 104. The feedback resistor 108 outputs the feedback signal I FB to the control circuit 110 according to the driving signal I D . The feedback signal I FB is a voltage signal. The second inductor 302 is configured to detect the current signal I C flowing through the first inductor 94 and output the detection signal I Q to the zero current detector 211 of the control circuit 110.
發光二極體串列104藉由分壓端點P提供啟動電壓VS 予控制電路110,當啟動電壓VS 大於或等於控制電路110的工作電壓VDD 時,第一比較器204比較回授信號IFB 與參考電壓Vref 的大小而輸出第一比較信號ICOMP1 至第二比較器206,第二比較器206比較第一比較信號ICOMP1 與三角波產生器202所輸出三角波信號ITRI 的大小而輸出第二比較信號ICOMP2 至脈衝寬度調變產生器210。電壓感測器208因判斷啟動電壓VS 大於或等於工作電壓VDD 而輸出感測信號Ise 至脈衝寬度調變產生器210。脈衝寬度調變產生器210依據感測信號Ise 、截斷信號Istop 與第二比較信號ICOMP2 輸出致動信號IEN 至驅動器212,驅動器212依據致動信號IEN 輸出脈衝寬度調變信號IPWM ,以選擇性地啟動或關閉開關電晶體60,進而調整驅動發光二極體串列104的驅動信號ID 之大小。需注意的是,當偵測信號IQ 為零時,零電流偵測器211輸出截斷信號Istop 至脈衝寬度調變產生器210,使得脈衝寬度調變產生器210無法輸出脈衝寬度調變信號IPWM 。The LED array 104 provides a startup voltage V S to the control circuit 110 by the voltage dividing terminal P. When the startup voltage V S is greater than or equal to the operating voltage V DD of the control circuit 110, the first comparator 204 compares the feedback signals. The number I FB and the reference voltage V ref output a first comparison signal I COMP1 to the second comparator 206, and the second comparator 206 compares the size of the first comparison signal I COMP1 with the triangular wave signal I TRI output by the triangular wave generator 202 The second comparison signal I COMP2 is output to the pulse width modulation generator 210. The voltage sensor 208 outputs the sensing signal I se to the pulse width modulation generator 210 by determining that the startup voltage V S is greater than or equal to the operating voltage V DD . The pulse width modulation generator 210 outputs the actuation signal I EN to the driver 212 according to the sensing signal I se , the truncation signal I stop and the second comparison signal I COMP2 , and the driver 212 outputs the pulse width modulation signal I according to the actuation signal I EN The PWM is configured to selectively activate or deactivate the switching transistor 60 to adjust the magnitude of the driving signal I D that drives the LED array 104. It should be noted that when the detection signal I Q is zero, the zero current detector 211 outputs the cutoff signal I stop to the pulse width modulation generator 210, so that the pulse width modulation generator 210 cannot output the pulse width modulation signal. I PWM .
請參照「第6圖」,係為依據本提案所揭露之發光二極體驅動電路的第四實施例電路結構示意圖。發光二極體驅動電路100係為非隔離式發光二極體驅動電路,且包括輸入電源電路102、發光二極體串列104、昇壓轉換器106、回授電阻108與控制電路110,昇壓轉換器106包括電源輸入端107、電源輸出端109、開關電晶體60與輸出電容98。其中,電源輸入端107耦接輸入電源電路102,電源輸出端109耦接發光二極體串列104與輸出電容98的一端,輸出電容98的另一端接地。分壓端點P耦接控制電路110,控制電路110耦接開關電晶體60。Please refer to FIG. 6 , which is a schematic diagram of the circuit structure of the fourth embodiment of the LED driving circuit disclosed in the present proposal. The LED driving circuit 100 is a non-isolated LED driving circuit, and includes an input power circuit 102, a LED array 104, a boost converter 106, a feedback resistor 108, and a control circuit 110. The voltage converter 106 includes a power input 107, a power output 109, a switching transistor 60, and an output capacitor 98. The power input terminal 107 is coupled to the input power circuit 102. The power output terminal 109 is coupled to one end of the LED array 104 and the output capacitor 98, and the other end of the output capacitor 98 is grounded. The voltage dividing terminal P is coupled to the control circuit 110, and the control circuit 110 is coupled to the switching transistor 60.
在本實施例中,發光二極體驅動電路100與第一實施例差異點在於回授電阻108的配置位置。回授電阻108的一端耦接第五十四個發光二極體20,回授電阻108的另一端耦接第五十五個發光二極體20,分壓端點P可配置於第五十四個發光二極體與回授電阻108之間,但本實施例並非用以限定本提案。舉例而言,分壓端點P亦可配置於回授電阻108與第五十五個發光二極體20之間(請參照「第7圖」,係為依據本提案所揭露之發光二極體驅動電路的第五實施例電路結構示意圖)。In the present embodiment, the difference between the LED driving circuit 100 and the first embodiment lies in the arrangement position of the feedback resistor 108. One end of the feedback resistor 108 is coupled to the fifty-fourth light emitting diode 20, and the other end of the feedback resistor 108 is coupled to the fifty-fifth light emitting diode 20, and the voltage dividing end point P can be configured in the fiftyth Between the four light-emitting diodes and the feedback resistor 108, this embodiment is not intended to limit the proposal. For example, the voltage dividing terminal P can also be disposed between the feedback resistor 108 and the fifty-fifth LED diode 20 (refer to FIG. 7), which is a light-emitting diode according to the proposal. A circuit configuration diagram of a fifth embodiment of the body drive circuit).
請參照「第6圖」與「第7圖」,當輸入電源電路102剛輸出電流信號IC 時,控制電路110未被啟動且昇壓轉換器106未開始運作,電流信號IC 係對輸出電容98充電。當輸出電容98的電壓大於導通發光二極體串列104的電壓時,輸出驅動信號ID以驅動發光二極體串列104。回授電阻108依據驅動信號ID 輸出回授信號IFB 至控制電路110。其中,回授信號IFB 為電壓信號。發光二極體串列104藉由分壓端點P提供啟動電壓VS 予控制電路110,當啟動電壓VS 大於或等於控制電路110的工作電壓VDD 時,控制電路110依據回授信號IFB 輸出脈衝寬度調變信號IPWM ,以選擇性地啟動或關閉開關電晶體60,進而調整驅動發光二極體串列104的驅動信號ID 之大小。Referring to "Fig. 6" and "Fig. 7", when the input power supply circuit 102 just outputs the current signal I C , the control circuit 110 is not activated and the boost converter 106 does not start operating, and the current signal I C is outputted. Capacitor 98 is charged. When the voltage of the output capacitor 98 is greater than the voltage of the LED array 104, the drive signal ID is output to drive the LED array 104. The feedback resistor 108 outputs the feedback signal I FB to the control circuit 110 according to the driving signal I D . The feedback signal I FB is a voltage signal. The LED array 104 provides a starting voltage V S to the control circuit 110 by the voltage dividing terminal P. When the starting voltage V S is greater than or equal to the operating voltage V DD of the control circuit 110, the control circuit 110 is based on the feedback signal I. The FB outputs a pulse width modulation signal I PWM to selectively activate or deactivate the switching transistor 60 to adjust the magnitude of the driving signal I D that drives the LED array 104.
請參照「第8圖」,係為依據本提案所揭露之發光二極體驅動電路的第六實施例電路結構示意圖。發光二極體驅動電路100係為非隔離式發光二極體驅動電路,且包括輸入電源電路102、發光二極體串列104、昇壓轉換器106、回授電阻108與控制電路110,昇壓轉換器106包括電源輸入端107、電源輸出端109、開關電晶體60與輸出電容98。其中,電源輸入端107耦接輸入電源電路102,電源輸出端109耦接發光二極體串列104與輸出電容98的一端,輸出電容98的另一端接地。分壓端點P耦接控制電路110,控制電路110耦接開關電晶體60。Please refer to FIG. 8 for a circuit configuration diagram of a sixth embodiment of the LED driving circuit disclosed in the present proposal. The LED driving circuit 100 is a non-isolated LED driving circuit, and includes an input power circuit 102, a LED array 104, a boost converter 106, a feedback resistor 108, and a control circuit 110. The voltage converter 106 includes a power input 107, a power output 109, a switching transistor 60, and an output capacitor 98. The power input terminal 107 is coupled to the input power circuit 102. The power output terminal 109 is coupled to one end of the LED array 104 and the output capacitor 98, and the other end of the output capacitor 98 is grounded. The voltage dividing terminal P is coupled to the control circuit 110, and the control circuit 110 is coupled to the switching transistor 60.
在本實施例中,發光二極體驅動電路100與第一實施例差異點在於回授電阻108的配置位置。回授電阻108的一端耦接開關電晶體60所輸出第一信號IG 的一端(即場效電晶體的源極S),回授電阻108的另一端接地。In the present embodiment, the difference between the LED driving circuit 100 and the first embodiment lies in the arrangement position of the feedback resistor 108. One end of the feedback resistor 108 is coupled to one end of the first signal I G outputted by the switch transistor 60 (ie, the source S of the field effect transistor), and the other end of the feedback resistor 108 is grounded.
當輸入電源電路102剛輸出電流信號IC 時,控制電路110未被啟動且昇壓轉換器106未開始運作,電流信號IC 係對輸出電容98充電。當輸出電容98的電壓大於導通發光二極體串列104的電壓時,輸出驅動信號ID 以驅動發光二極體串列104。回授電阻108依據第一信號IG 輸出回授信號IFB 至控制電路110。其中,回授信號IFB 為電壓信號。發光二極體串列104藉由分壓端點P提供啟動電壓VS 予控制電路110,當啟動電壓VS 大於或等於控制電路110的工作電壓VDD 時,控制電路110輸出脈衝寬度調變信號IPWM ,以選擇性地啟動或關閉開關電晶體60,進而調整驅動發光二極體串列104的驅動信號ID 之大小。When the input power circuit 102 has just output the current signal I C , the control circuit 110 is not activated and the boost converter 106 is not operating, and the current signal I C charges the output capacitor 98 . When the voltage of the output capacitor 98 is greater than the voltage of the LED array 104, the drive signal I D is output to drive the LED array 104. The feedback resistor 108 outputs the feedback signal I FB to the control circuit 110 according to the first signal I G . The feedback signal I FB is a voltage signal. The LED array 104 provides a starting voltage V S to the control circuit 110 by the voltage dividing terminal P. When the starting voltage V S is greater than or equal to the operating voltage V DD of the control circuit 110, the control circuit 110 outputs a pulse width modulation. The signal I PWM is used to selectively activate or deactivate the switching transistor 60 to adjust the magnitude of the drive signal I D that drives the LED array 104.
依據本提案所揭露之發光二極體驅動電路的實施例,適用以驅動發光二極體串列。可藉由發光二極體串列的分壓端點依據控制電路所需工作電壓調整位置,使得發光二極體驅動電路不必藉由習知啟動電路即可啟動具有不同工作電壓的控制電路。由於啟動控制電路所需的電流很小,僅占驅動發光二極體串列所需電流的百分之二至百分之五,故不影響發光二極體串列的導通。再者,控制電路具有回授控制,使得發光二極體不受溫度影響而持續導通。According to an embodiment of the LED driving circuit disclosed in the present proposal, it is suitable to drive the LED array. The position of the voltage dividing end of the LED array can be adjusted according to the required operating voltage of the control circuit, so that the LED driving circuit can start the control circuit with different working voltages without having to use the conventional starting circuit. Since the current required to start the control circuit is small, it only accounts for two to five percent of the current required to drive the LED series, so that the conduction of the LED series is not affected. Furthermore, the control circuit has feedback control such that the light-emitting diode is continuously turned on without being affected by temperature.
雖然本提案以前述的較佳實施例揭露如上,然其並非用以限定本提案,任何熟習相像技藝者,在不脫離本提案的精神和範圍內,當可作些許的更動與潤飾,因此本提案的專利保護範圍須視本說明書所附的申請專利範圍所界定者為準。While the present invention has been disclosed in the foregoing preferred embodiments, it is not intended to limit the present invention. Any skilled person skilled in the art can make some changes and refinements without departing from the spirit and scope of the present proposal. The scope of patent protection of the proposal shall be subject to the definition of the scope of the patent application attached to this specification.
20...發光二極體20. . . Light-emitting diode
60...開關電晶體60. . . Switching transistor
62...第二二極體62. . . Second diode
90...交流信號源90. . . AC signal source
92...橋式整流器92. . . Bridge rectifier
94...第一電感94. . . First inductance
96...第一二極體96. . . First diode
98...輸出電容98. . . Output capacitor
100...發光二極體驅動電路100. . . Light-emitting diode driving circuit
102...輸入電源電路102. . . Input power circuit
104...發光二極體串列104. . . Light-emitting diode series
106...昇壓轉換器106. . . Boost converter
107...電源輸入端107. . . Power input
108...回授電阻108. . . Feedback resistor
109...電源輸出端109. . . Power output
110...控制電路110. . . Control circuit
202...三角波產生器202. . . Triangle wave generator
204...第一比較器204. . . First comparator
2041...第一正輸入端2041. . . First positive input
2042...第二負輸入端2042. . . Second negative input
2043...第一輸出端2043. . . First output
206...第二比較器206. . . Second comparator
2061...第二正輸入端2061. . . Second positive input
2062...第二負輸入端2062. . . Second negative input
2063...第二輸出端2063. . . Second output
208...電壓感測器208. . . Voltage sensor
210...脈衝寬度調變產生器210. . . Pulse width modulation generator
211...零電流偵測器211. . . Zero current detector
212...驅動器212. . . driver
302...第二電感302. . . Second inductance
304...偵測電阻304. . . Detecting resistance
621、961...輸入端621, 961. . . Input
622、962...輸出端622, 962. . . Output
第1圖係為依據本提案所揭露之發光二極體驅動電路的第一實施例電路結構示意圖。FIG. 1 is a schematic diagram showing the circuit structure of a first embodiment of a light emitting diode driving circuit according to the present proposal.
第2圖係為依據本提案所揭露之發光二極體驅動電路的第二實施例電路結構示意圖。2 is a schematic diagram showing the circuit structure of a second embodiment of the LED driving circuit disclosed in the present proposal.
第3圖係為第1圖之控制電路的一實施例電路結構示意圖。Fig. 3 is a circuit diagram showing an embodiment of the control circuit of Fig. 1.
第4圖係為依據本提案所揭露之發光二極體驅動電路的第三實施例電路結構示意圖。4 is a schematic diagram showing the circuit structure of a third embodiment of the LED driving circuit disclosed in the present proposal.
第5圖係為第4圖之控制電路的一實施例電路結構示意圖。Fig. 5 is a circuit diagram showing an embodiment of a control circuit of Fig. 4.
第6圖係為依據本提案所揭露之發光二極體驅動電路的第四實施例電路結構示意圖。Figure 6 is a schematic diagram showing the circuit structure of a fourth embodiment of the LED driving circuit disclosed in the present proposal.
第7圖係為依據本提案所揭露之發光二極體驅動電路的第五實施例電路結構示意圖。Figure 7 is a schematic diagram showing the circuit structure of a fifth embodiment of the LED driving circuit disclosed in the present proposal.
第8圖係為依據本提案所揭露之發光二極體驅動電路的第六實施例電路結構示意圖。Figure 8 is a schematic diagram showing the circuit structure of a sixth embodiment of the LED driving circuit disclosed in the present proposal.
20...發光二極體20. . . Light-emitting diode
60...開關電晶體60. . . Switching transistor
62...第二二極體62. . . Second diode
90...交流信號源90. . . AC signal source
92...橋式整流器92. . . Bridge rectifier
94...第一電感94. . . First inductance
96...第一二極體96. . . First diode
98...輸出電容98. . . Output capacitor
100...發光二極體驅動電路100. . . Light-emitting diode driving circuit
102...輸入電源電路102. . . Input power circuit
104...發光二極體串列104. . . Light-emitting diode series
106...昇壓轉換器106. . . Boost converter
107...電源輸入端107. . . Power input
108...回授電阻108. . . Feedback resistor
109...電源輸出端109. . . Power output
110...控制電路110. . . Control circuit
621、961...輸入端621, 961. . . Input
622、962...輸出端622, 962. . . Output
Claims (21)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW100124346A TWI439169B (en) | 2011-07-08 | 2011-07-08 | Light emitting diode driving circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW100124346A TWI439169B (en) | 2011-07-08 | 2011-07-08 | Light emitting diode driving circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
TW201304597A TW201304597A (en) | 2013-01-16 |
TWI439169B true TWI439169B (en) | 2014-05-21 |
Family
ID=48138315
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW100124346A TWI439169B (en) | 2011-07-08 | 2011-07-08 | Light emitting diode driving circuit |
Country Status (1)
Country | Link |
---|---|
TW (1) | TWI439169B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9723664B2 (en) | 2014-06-05 | 2017-08-01 | Leadtrend Technology Corporation | Control methods and power converters suitable for TRIAC dimming |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9894725B2 (en) | 2013-03-14 | 2018-02-13 | Philips Lighting Holding B.V. | Current feedback for improving performance and consistency of LED fixtures |
CN104640269A (en) * | 2013-11-08 | 2015-05-20 | 苏州璨宇光学有限公司 | Light source device |
FI125185B (en) | 2014-01-15 | 2015-06-30 | Teknoware Oy | Procedure and converter for power supply to series connected LEDs |
CN105208707B (en) * | 2014-06-18 | 2018-10-26 | 通嘉科技股份有限公司 | Control method and power supply changeover device suitable for bi-directional thyristor switch element light modulation |
-
2011
- 2011-07-08 TW TW100124346A patent/TWI439169B/en active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9723664B2 (en) | 2014-06-05 | 2017-08-01 | Leadtrend Technology Corporation | Control methods and power converters suitable for TRIAC dimming |
Also Published As
Publication number | Publication date |
---|---|
TW201304597A (en) | 2013-01-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
TWI384904B (en) | The driving circuit of the light emitting diode | |
TWI428057B (en) | Light-emitting driving circuit with function of dynamic loading and increasing power factor and related dynamic loading module | |
US20140152183A1 (en) | Led lighting apparatus, current regulator for the led lighting apparatus, and current regulation method of the led lighting apparatus | |
TWI439169B (en) | Light emitting diode driving circuit | |
CN112838772B (en) | Flyback switching power supply and control method thereof | |
JP6210936B2 (en) | Self-excited resonance type power factor correction circuit and light source driving device | |
JP2011222266A (en) | Lighting device and lighting fixture using the same | |
TWI596986B (en) | Dimming device | |
US20100156314A1 (en) | Light source driver circuit | |
TWI465153B (en) | Valley synchronous regulator with pfc led driver system | |
JP2009302017A (en) | Light-emitting diode-lighting device, and lighting system | |
JP2012135095A (en) | Led lighting device and lighting apparatus using the same | |
KR101932364B1 (en) | Led backlight for liquid crystal display device and liquid crystal display device | |
US8467202B2 (en) | Flyback power supply system | |
US9763294B2 (en) | Lighting device and lighting fixture using same | |
JP2017069180A (en) | Light source lighting device and illuminating device | |
JP7066060B2 (en) | Drive circuit and related lamps | |
TW201517694A (en) | Flicker-free power converter for driving light-emitting diodes and flicker-free power converter | |
JP2011100837A (en) | Self-excitation type led driving circuit | |
KR20130113363A (en) | Led emitting device and the driving method thereof | |
US8963429B2 (en) | Lighting apparatus for fluorescent tube and driving method therefor | |
JP5478347B2 (en) | Light source lighting device and lighting fixture | |
KR101702741B1 (en) | Lamp Switch Position Indicating Apparatus | |
JP2016012423A (en) | Light-emitting element drive circuit and lighting apparatus using the same | |
JP5519861B2 (en) | Power circuit |