TWI665935B - Active power factor correction driving system for LED light emitting element - Google Patents
Active power factor correction driving system for LED light emitting element Download PDFInfo
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Abstract
本發明旨在揭露一種LED發光元件之主動功因修正驅動系統，其係包含一啟動電路、一量化電路以及一脈波控制處理電路，啟動電路與量化電路電性連接，量化電路與脈波控制處理電路電性連接。啟動電路接收一整流電壓以啟動該驅動系統，量化電路將整流電壓進行電壓量化以產生複數個數位訊號，脈波控制處理電路依據該些數位訊號進行編碼、閂鎖、解碼、計數以及比較等步驟而產生至少一切換訊號。爾後，切換訊號控制至少一切換開關，而調整發光元件之一驅動電流，換言之，透過切換訊號之責任週期的變化，而調節切換開關驅動發光元件之電流供應方式。The invention aims to disclose an active power factor correction driving system for an LED light-emitting element, which comprises a startup circuit, a quantization circuit, and a pulse wave control processing circuit. The startup circuit is electrically connected to the quantization circuit, and the quantization circuit and the pulse wave control. The processing circuit is electrically connected. The starting circuit receives a rectified voltage to start the driving system. The quantization circuit performs voltage quantization on the rectified voltage to generate a plurality of digital signals. The pulse wave control processing circuit performs steps such as encoding, latching, decoding, counting, and comparing according to the digital signals. At least one switching signal is generated. Thereafter, the switching signal controls at least one switching switch and adjusts a driving current of one of the light-emitting elements, in other words, the current supply mode of the switching switch driving the light-emitting element is adjusted by changing the duty cycle of the switching signal.
Description
本發明係有關於一種LED發光元件之主動功因修正驅動系統，其尤指一種可控制發光元件運作，而改善驅動系統之功率因數，以提升驅動系統之效能。 The present invention relates to an active power factor correction driving system for an LED light-emitting element, and more particularly, it can control the operation of the light-emitting element and improve the power factor of the driving system to improve the efficiency of the driving system.
隨著發光二極體的問世與逐漸取代傳統照明燈具，而普遍的應用於各式照明裝置上；並且由於發光二極體的運用越來越廣泛，伴隨而來的電力使用效率技術益發受到重視。因此，如何在環保、節能等意識抬頭之需求下，改善發光二極體之驅動電路的功率因素，儼然已成為一重要之研發目標。 With the advent of light-emitting diodes and the gradual replacement of traditional lighting fixtures, they are commonly used in various types of lighting devices; and because the use of light-emitting diodes is becoming more and more widespread, the accompanying power use efficiency technology has received increasing attention . Therefore, how to improve the power factor of the driving circuit of the light-emitting diode under the rising demand of environmental protection and energy saving has become an important research and development goal.
功率因數(Power Factor，PF)可以做為效能的指標；惟，被動式功率因數修正電路所需設置之元件，其體積多為龐大且重量較重之設計，因此已無法因應現今電子產品朝向輕、薄、小以及高效能之發展方向。 Power Factor (PF) can be used as an indicator of performance; however, the components required for passive power factor correction circuits are mostly bulky and heavy designs, so it is no longer possible to respond to the current trend of light and electronic products. Development direction of thin, small and high performance.
職是之故，本發明人鑑於提升電路的功率因素，茲思及發明改良之意念，將驅動發光二極體之電路加入主動功率因數修正的技術進行改良，以期降低電路的功率消耗、降低電路體積以及減少生產成本。 The reason for this is that in view of the power factor of the circuit, the inventors of the present invention and the idea of improvement, added the technology that drives the light-emitting diode to the active power factor correction technology to improve, in order to reduce the power consumption of the circuit and reduce the circuit. Volume and reduce production costs.
本發明之一目的係提供一種LED發光元件之主動功因修正驅動系統，其係將驅動系統之輸入端與外部交流電源電性連接，且藉由驅動系統包含之一啟動電路、量化電路以及脈波控制處理電路進行處 理，而使驅動系統具有功率因數改善、穩壓以及提升驅動系統之使用效能等功效。 An object of the present invention is to provide an active power factor correction driving system for an LED light emitting element, which electrically connects an input end of the driving system with an external AC power source, and the driving system includes a startup circuit, a quantization circuit, and a pulse generator. Wave control processing circuit Management, so that the drive system has the power factor improvement, voltage stabilization and improve the use efficiency of the drive system.
為了達成上述之目的，本發明提供一種LED發光元件之主動功因修正驅動系統，其包含一啟動電路、一量化電路及一脈波控制處理電路；啟動電路接收一整流電壓以啟動該驅動系統；量化電路耦接該啟動電路，依據該整流電壓產生複數數位訊號；以及脈波控制處理電路依據該些數位訊號產生至少一切換訊號，切換訊號控制至少一切換開關，而調整發光元件之一驅動電流。 In order to achieve the above object, the present invention provides an active power factor correction driving system for an LED light emitting element, which includes a startup circuit, a quantization circuit, and a pulse wave control processing circuit; the startup circuit receives a rectified voltage to start the driving system; A quantization circuit is coupled to the starting circuit to generate a complex digital signal according to the rectified voltage; and a pulse wave control processing circuit generates at least one switching signal according to the digital signals, the switching signal controls at least one switching switch, and adjusts a driving current of one of the light-emitting elements .
1‧‧‧驅動系統 1‧‧‧Drive System
10‧‧‧啟動電路 10‧‧‧Start circuit
11‧‧‧量化電路 11‧‧‧Quantization circuit
12‧‧‧脈波控制處理電路 12‧‧‧Pulse wave control processing circuit
120‧‧‧編碼電路 120‧‧‧coding circuit
121‧‧‧閂鎖電路 121‧‧‧ Latch circuit
122‧‧‧解碼電路 122‧‧‧ decoding circuit
123‧‧‧計數電路 123‧‧‧Counting circuit
124‧‧‧比較電路 124‧‧‧Comparison circuit
125‧‧‧移位暫存電路 125‧‧‧ shift temporary storage circuit
126‧‧‧第一輸出端 126‧‧‧first output
127‧‧‧第二輸出端 127‧‧‧Second output
13‧‧‧緩衝電路 13‧‧‧Buffer circuit
14‧‧‧變壓器 14‧‧‧Transformer
16‧‧‧反相電路 16‧‧‧ Inverting circuit
17‧‧‧壓控震盪電路 17‧‧‧Voltage Controlled Oscillation Circuit
172‧‧‧輸入端 172‧‧‧input
18‧‧‧復歸電路 18‧‧‧ Return circuit
19‧‧‧訊號分離器 19‧‧‧Signal Splitter
40‧‧‧參考電壓電路 40‧‧‧Reference voltage circuit
42‧‧‧回授電路 42‧‧‧Feedback circuit
3‧‧‧整流電路 3‧‧‧ rectifier circuit
5‧‧‧交流電源 5‧‧‧AC Power
7‧‧‧切換開關 7‧‧‧ switch
9‧‧‧發光元件 9‧‧‧light-emitting element
V1‧‧‧第一驅動電壓 V1‧‧‧first driving voltage
V2‧‧‧第二驅動電壓 V2‧‧‧Second driving voltage
V3‧‧‧第三驅動電壓 V3‧‧‧Third driving voltage
D2‧‧‧二極體 D2‧‧‧ Diode
VDD、VDD2‧‧‧電壓供應端 VDD, VDD2‧‧‧ voltage supply terminal
I1‧‧‧電流 I1‧‧‧ current
I2‧‧‧電流 I2‧‧‧ current
Q1、Q2‧‧‧功率電晶體 Q1, Q2‧‧‧ Power Transistors
第一圖：其為本發明之LED發光元件之主動功因修正驅動系統之第一實施例的方塊圖；第二圖：其為本發明之LED發光元件之主動功因修正驅動系統之第一實施例的電路圖；第三圖：其為本發明之LED發光元件之主動功因修正驅動系統之第一實施例的啟動電路示意圖；第四圖：其為本發明之LED發光元件之主動功因修正驅動系統之第一實施例的啟動電路模擬結果圖；第五圖：其為本發明之LED發光元件之主動功因修正驅動系統之第一實施例的量化電路示意圖；第六圖：其為本發明之LED發光元件之主動功因修正驅動系統之第一實施例的轉態電壓數值圖；第七圖：其為本發明之LED發光元件之主動功因修正驅動系統之第一實施例的脈波控制處理電路方塊圖； 第八圖：其為本發明之LED發光元件之主動功因修正驅動系統之第一實施例的脈波寬度調變訊號數值圖；第九圖：其為本發明之LED發光元件之主動功因修正驅動系統之第一實施例的緩衝電路示意圖；第十圖：其為本發明之LED發光元件之主動功因修正驅動系統之第二實施例的方塊圖；以及第十一圖：其為本發明之LED發光元件之主動功因修正驅動系統之第二實施例的脈波控制處理電路方塊圖。 First figure: it is a block diagram of the first embodiment of the active power factor correction driving system of the LED light emitting element of the present invention; second figure: it is the first embodiment of the active power factor correction driving system of the LED light emitting element of the present invention The circuit diagram of the embodiment; the third diagram: the startup circuit diagram of the first embodiment of the active power factor correction driving system of the LED light emitting element of the present invention; the fourth diagram: the active power factor of the LED light emitting element of the present invention Figure 5 shows the simulation results of the startup circuit of the first embodiment of the modified drive system. Figure 5 is a schematic diagram of the quantized circuit of the first embodiment of the active power factor modified drive system of the LED light emitting device of the present invention. Figure 6: Numerical diagram of the transition voltage of the first embodiment of the active power factor correction driving system of the LED light emitting element of the present invention; FIG. 7 is a diagram of the first embodiment of the active power factor correction driving system of the LED light emitting element of the present invention Block diagram of pulse wave control processing circuit; Figure 8: This is a numerical diagram of the pulse width modulation signal of the first embodiment of the active power factor correction driving system of the LED light emitting element of the present invention; Figure 9: It is the active power factor of the LED light emitting element of the present invention Schematic diagram of the buffer circuit of the first embodiment of the modified driving system; FIG. 10 is a block diagram of the second embodiment of the active power factor correction driving system of the LED light-emitting element of the present invention; and FIG. 11 is this: The block diagram of the pulse wave control processing circuit of the second embodiment of the active power factor correction driving system of the inventive LED light emitting element.
為使 貴審查委員對本發明之特徵及所達成之功效有更進一步之瞭解與認識，僅佐以實施例及配合詳細之說明，說明如後：參閱第一圖與第二圖，其為本發明之LED發光元件之主動功因修正驅動系統之第一實施例的方塊圖以及電路圖。如圖所示，本發明之LED發光元件之主動功因修正驅動系統1(下稱驅動系統1)本身為一驅動晶片而包含一啟動電路10、一量化電路11以及一脈波控制處理電路12。首先一輸入交流電源5(下稱交流電源5)耦接一整流電路3，交流電源5可以係由電力公司輸配至用戶端之市電，其為電壓100~110V或200~240V，且為頻率50~60HZ之交流電。整流電路3將交流電源5所提供之交流電壓進行整流(例如：橋式整流)，而使交流電壓轉換成一直流電壓(或稱整流電壓)，轉換完成之直流電壓係供應至啟動電路10以啟動驅動系統1作為電力使用。 In order to make your reviewing members have a better understanding and understanding of the features of the present invention and the effects achieved, only the examples and the detailed descriptions will be provided. The description is as follows: refer to the first and second figures, which are the invention The block diagram and circuit diagram of the first embodiment of the active power factor correction driving system of the LED light emitting element. As shown in the figure, the active power factor correction driving system 1 (hereinafter referred to as the driving system 1) of the LED light-emitting element of the present invention is a driving chip and includes a startup circuit 10, a quantization circuit 11, and a pulse wave control processing circuit 12. . First, an input AC power source 5 (hereinafter referred to as AC power source 5) is coupled to a rectifier circuit 3. The AC power source 5 can be a commercial power source that is distributed by a power company to a user terminal, and has a voltage of 100 ~ 110V or 200 ~ 240V and a frequency 50 ~ 60HZ AC power. The rectifier circuit 3 rectifies the AC voltage provided by the AC power source 5 (for example, bridge rectification), and converts the AC voltage into a DC voltage (or rectified voltage). The converted DC voltage is supplied to the startup circuit 10 to start The drive system 1 is used as electric power.
整流電路3耦接交流電源5而產生之整流電壓，係用於產生一第一驅動電壓V1以及一第二驅動電壓V2，第一驅動電壓V1供給至啟動電路10啟動驅動系統1，以作為驅動系統1的一啟動電源；第二驅動電壓V2供給至一緩衝電路13電力使用，以藉由緩衝電路13驅動切換開關7作 動。一變壓器14之一一次側耦接驅動系統1、整流電路3以及切換開關7，一二次側耦接發光元件9、參考電壓電路40以及一回授電路42，一三次側經由磁場感應產生一第三驅動電壓V3，當第三驅動電壓V3到達一設定值時，即供給驅動系統1電力使用，同時切斷第一驅動電壓V1以停止供應驅動系統1電力。 The rectified voltage generated by the rectifier circuit 3 coupled to the AC power source 5 is used to generate a first drive voltage V1 and a second drive voltage V2. The first drive voltage V1 is supplied to the startup circuit 10 to start the drive system 1 as a drive. A start-up power supply of the system 1; the second driving voltage V2 is supplied to a buffer circuit 13 for power use, so that the switch 7 is driven by the buffer circuit 13 as move. One of the transformers 14 is coupled to the driving system 1, the rectifier circuit 3, and the switch 7 on the primary side, the light-emitting element 9, the reference voltage circuit 40, and the feedback circuit 42 on the secondary side, and the magnetic field induction on the tertiary side. A third driving voltage V3 is generated. When the third driving voltage V3 reaches a set value, the third driving voltage V3 is supplied to the driving system 1 for power use, and the first driving voltage V1 is cut off to stop supplying the driving system 1 power.
請一併參閱第三圖以及第四圖，其為本發明之LED發光元件之主動功因修正驅動系統之第一實施例的啟動電路示意圖，以及啟動電路模擬結果圖。如圖所示，啟動電路10包含一功率電晶體Q2以及一二極體D2，功率電晶體Q2作為穩壓IC且啟動啟動電路10使用，二極體D2作為開關使用。一開始啟動電路10接收整流電路3產生之第一驅動電壓V1而具有一啟動電壓(即第四圖之啟動電壓9V)，其電流I1(即第四圖之啟動電流)流經功率電晶體Q2供應至驅動系統1之電壓供應端VDD；此時，第三驅動電壓V3(即第四圖之回授電壓)尚未達到一設定值而未供應電流I2(即第四圖之回授電流)至電壓供應端VDD2。當第三驅動電壓V3達到設定值(12V)時，電壓供應端VDD之電壓大於功率電晶體Q2之S端電壓，同時二極體D2利用本身順向流通、逆向阻斷特點作為開關切斷電流I1，驅動系統1之電源改由第三驅動電壓V3供應，而由電流I2流至電壓供應端VDD2。 Please refer to FIG. 3 and FIG. 4 together, which are schematic diagrams of the startup circuit of the first embodiment of the active power factor correction driving system of the LED light-emitting element of the present invention, and simulation results of the startup circuit. As shown in the figure, the startup circuit 10 includes a power transistor Q2 and a diode D2. The power transistor Q2 is used as a voltage stabilization IC and the startup circuit 10 is used, and the diode D2 is used as a switch. At the beginning, the start-up circuit 10 receives the first driving voltage V1 generated by the rectifier circuit 3 and has a start-up voltage (that is, the start-up voltage of the fourth figure 9V). The voltage supply terminal VDD supplied to the driving system 1; at this time, the third driving voltage V3 (the feedback voltage in the fourth figure) has not reached a set value and the current I2 (the feedback current in the fourth figure) has not been supplied to Voltage supply terminal VDD2. When the third driving voltage V3 reaches the set value (12V), the voltage of the voltage supply terminal VDD is greater than the voltage of the S terminal of the power transistor Q2, and at the same time, the diode D2 uses its own forward flow and reverse blocking characteristics as the switch to cut off the current. I1, the power of the driving system 1 is supplied by the third driving voltage V3, and the current I2 flows to the voltage supply terminal VDD2.
另外，變壓器14之二次側作為輸出端而耦接發光元件9、一參考電壓電路40以及一回授電路42，發光元件9作為一負載而接收變壓器14二次側之電壓、電流使用。參考電壓電路40用以決定驅動系統1之輸出電壓位準保持一電壓值而作為一穩壓器使用。回授電路42用以偵測供應至發光元件9之輸出電壓是否異常，而作為一過載保護之電路使用，回授電路42耦接一訊號分離器19而將回授訊號傳遞至訊號分離器19。訊號分離器19係用以接收變壓器14一次側、二次側之高、低壓訊號，以傳遞及/或分離訊號至驅動系統1，訊號分離器19耦接驅動系統1，而將回授訊號利用高頻訊號做調變，以產生一高頻調變訊號傳輸至驅動 系統1，驅動系統1依據該高頻調變訊號進行高頻解調變而重建回授電路40之回授訊號。 In addition, the secondary side of the transformer 14 is coupled as an output terminal to the light emitting element 9, a reference voltage circuit 40, and a feedback circuit 42, and the light emitting element 9 is used as a load to receive the voltage and current of the secondary side of the transformer 14. The reference voltage circuit 40 is used to determine that the output voltage level of the driving system 1 maintains a voltage value and is used as a voltage regulator. The feedback circuit 42 is used to detect whether the output voltage supplied to the light-emitting element 9 is abnormal, and is used as an overload protection circuit. The feedback circuit 42 is coupled to a signal separator 19 and transmits the feedback signal to the signal separator 19. . The signal splitter 19 is used to receive the high and low voltage signals from the primary and secondary sides of the transformer 14 to transmit and / or separate the signal to the drive system 1. The signal splitter 19 is coupled to the drive system 1 and uses the feedback signal. The high frequency signal is modulated to generate a high frequency modulation signal for transmission to the driver System 1, the drive system 1 performs high-frequency demodulation and reconstruction based on the high-frequency modulation signal to reconstruct the feedback signal of the feedback circuit 40.
請一併參閱第五圖和第六圖，其為本發明之LED發光元件之主動功因修正驅動系統之第一實施例的量化電路示意圖與轉態電壓數值圖。如圖所示，整流電路3耦接交流電源5，並將交流電源5經過橋式整流，以及電阻分壓後產生一電壓值，該電壓值即為整流電壓。當量化電路11包含之一電壓偵測電路(未圖示)偵測交流電源5為110V，則整流電路3將交流電源5經過橋式整流、電阻分壓後取得之整流電壓值可以為2.5V。若偵測交流電源5為220V，則整流電路3將交流電源5經過橋式整流、電阻分壓後取得之整流電壓值可以為5V；整流電壓值係可依據耦接之發光元件9(負載)規格以及驅動系統1之需求而因應變換，並不以本發明之實施例所列舉之數據為限。 Please refer to FIG. 5 and FIG. 6 together, which are a schematic diagram of a quantization circuit and a numerical diagram of a transition voltage of the first embodiment of an active power factor correction driving system for an LED light emitting device according to the present invention. As shown in the figure, the rectifier circuit 3 is coupled to the AC power source 5, and the AC power source 5 is bridge-rectified, and a voltage value is generated after the resistor divides the voltage, and the voltage value is the rectified voltage. When the quantization circuit 11 includes a voltage detection circuit (not shown) to detect that the AC power supply 5 is 110V, the rectification circuit 3 can obtain the rectified voltage value of the AC power supply 5 after bridge rectification and resistance division by 2.5V. . If the AC power source 5 is detected as 220V, the rectified voltage obtained by the rectifier circuit 3 after the AC power source 5 is bridge-rectified and divided by the resistor may be 5V; the rectified voltage value may be based on the coupled light-emitting element 9 (load) The specifications and requirements of the drive system 1 are changed according to the requirements, and are not limited to the data listed in the embodiment of the present invention.
之後由量化電路11依據整流電壓產生複數個數位訊號，亦即透過7個反相器將整流電壓進行電壓量化(或稱數位化)，以獲取7個轉態電壓值(轉態電壓訊號)TR0~TR6，該些轉態電壓值為量化電路11調整每一反相器之長寬比(Zpd/Zpd)來改變該些轉態電壓值，俾使每一轉態電壓值產生不同之電壓位準。如第六圖所示，即當偵測交流電源5之電壓為220V時，取得7個經由電壓量化之轉態電壓值TR0~TR6，且該些轉態電壓值TR0~TR6再傳輸至脈波控制處理電路12進行處理；其中，為了後續脈波控制處理電路12方便進行編碼程序，可於電壓量化後再耦接一組與量化電路11具有相同數量反相器之反相電路16，以將轉態電壓訊號TR0~TR6由0轉換成1(或1轉換成0)。 The quantization circuit 11 then generates a plurality of digital signals according to the rectified voltage, that is, the voltage of the rectified voltage is quantized (or digitized) through 7 inverters to obtain 7 transition voltage values (transition voltage signals) TR0. ~ TR6, these transition voltage values are quantization circuit 11 adjust the aspect ratio (Zpd / Zpd) of each inverter to change the transition voltage values, so that each transition voltage value produces a different voltage bit quasi. As shown in the sixth figure, when the voltage of the AC power supply 5 is detected to be 220V, seven transition voltage values TR0 to TR6 quantified by the voltage are obtained, and the transition voltage values TR0 to TR6 are transmitted to the pulse wave. The control processing circuit 12 performs processing. Among them, in order to facilitate the subsequent pulse wave control processing circuit 12 to perform the encoding program, a set of inverter circuits 16 having the same number of inverters as the quantization circuit 11 may be coupled after the voltage quantization, so that The transition voltage signals TR0 ~ TR6 are converted from 0 to 1 (or 1 to 0).
承接前段，脈波控制處理電路12取得該些轉態電壓值TR0~TR6後，係歷經編碼、閂鎖、解碼、計數以及比較等電路進行處理以產生切換訊號。請一併參閱第七圖，其為本發明之LED發光元件之主動功因修正驅動系統之第一實施例的脈波控制處理電路方塊圖。如圖所示，本發明之脈波控制處理電路12係包含一編碼電路120、一閂鎖電路 121、一解碼電路122、一計數電路123以及一比較電路124。當編碼電路120取得該些數位訊號(即轉態電壓訊號TR0~TR6)後，閂鎖電路121係記錄量化電路11量化處理後之交流電源5的最大位準值，而編碼電路120即對應閂鎖電路121產生複數組資料，若記錄交流電源5之電壓為110V，則編碼電路120維持或減少該些數位訊號之位元數進行編碼，以產生3~5組編碼資料；若記錄交流電源5之電壓為220V，則編碼電路120維持或增加該些數位訊號之位元數進行編碼，以產生5~9組編碼資料。另外，閂鎖電路121更耦接一復歸電路18，其係依據閂鎖電路121記錄交流電源5之最大位準值為高準位時，對閂鎖電路121進行復歸。換言之，復歸電路18用以重新啟動閂鎖電路121偵測交流電源5，避免閂鎖電路121偵測交流電源5時產生誤動作，而將判讀錯誤之訊號提供於編碼電路120；復歸電路18更可作為一控制元件，而由使用者依據需求操作閂鎖電路121復歸與否。 After receiving the previous stage, after the pulse wave control processing circuit 12 obtains these transition voltage values TR0 ~ TR6, it undergoes processing such as encoding, latching, decoding, counting, and comparison to generate a switching signal. Please refer to FIG. 7 together, which is a block diagram of a pulse wave control processing circuit of the first embodiment of the active power factor correction driving system of the LED light emitting device of the present invention. As shown in the figure, the pulse wave control processing circuit 12 of the present invention includes an encoding circuit 120 and a latch circuit. 121. A decoding circuit 122, a counting circuit 123, and a comparison circuit 124. After the encoding circuit 120 obtains these digital signals (ie, the transition voltage signals TR0 to TR6), the latch circuit 121 records the maximum level value of the AC power supply 5 after the quantization circuit 11 performs the quantization processing, and the encoding circuit 120 corresponds to the latch The lock circuit 121 generates complex array data. If the voltage of the AC power source 5 is recorded as 110V, the encoding circuit 120 maintains or reduces the number of bits of these digital signals to encode to generate 3 to 5 sets of coded data. If the AC power source 5 is recorded, When the voltage is 220V, the encoding circuit 120 maintains or increases the number of bits of the digital signals to perform encoding to generate 5 to 9 sets of encoded data. In addition, the latch circuit 121 is further coupled to a reset circuit 18, which resets the latch circuit 121 when the maximum value of the AC power source 5 recorded by the latch circuit 121 is high. In other words, the reset circuit 18 is used to restart the latch circuit 121 to detect the AC power supply 5 to prevent the latch circuit 121 from malfunctioning when the AC power supply 5 is detected, and to provide a signal for the interpretation error to the encoding circuit 120; As a control element, the user operates the latch circuit 121 according to the demand to reset or not.
編碼電路120編輯完成之資料以及閂鎖電路121記錄之訊號皆傳輸至解碼電路122。再者，計數電路123由一壓控震盪電路17提供一頻率供計數電路123運作，解碼電路122運算之解碼訊號與計數電路123之計數訊號傳遞至比較電路124，而經由比較電路124進行比較解碼訊號與計數訊號後產生切換訊號；其中，編碼電路120可以為8-3編碼器，解碼電路122可以為4-16解碼器，計數電路123可以為8位元(bits)計數器，比較電路124可以為8位元(bits)比較器。 The data edited by the encoding circuit 120 and the signals recorded by the latch circuit 121 are transmitted to the decoding circuit 122. Furthermore, the counting circuit 123 is provided by a voltage-controlled oscillation circuit 17 to provide a frequency for the counting circuit 123 to operate. The decoding signal calculated by the decoding circuit 122 and the counting signal of the counting circuit 123 are transmitted to the comparison circuit 124, and the comparison circuit 124 performs comparison decoding. The switching signal is generated after the signal and the counting signal. Among them, the encoding circuit 120 may be an 8-3 encoder, the decoding circuit 122 may be a 4-16 decoder, the counting circuit 123 may be an 8-bit counter, and the comparison circuit 124 may It is an 8-bit comparator.
此外，本發明之驅動系統1係內建壓控震盪電路17，其耦接計數電路123，且於壓控震盪電路17之一輸入端172輸入一控制訊號，以產生一供驅動系統1使用之一頻率。該控制訊號係可根據變壓器14本身之頻率，而透過使用者決定驅動系統1與變壓器14對應匹配之頻率數值。亦即由驅動系統1之輸入電壓控制壓控震盪電路17之輸入端172提供一震盪頻率於計數電路123，爾後藉由脈波控制處理電路12產生之切換訊 號決定切換開關7的切換頻率，並且在不同負載情況下，可藉由調整壓控制震盪電路17提供之震盪頻率以增加驅動系統1之效率。 In addition, the drive system 1 of the present invention is a built-in voltage-controlled oscillation circuit 17 which is coupled to the counting circuit 123 and inputs a control signal to an input terminal 172 of the voltage-controlled oscillation circuit 17 to generate a signal for the drive system 1 to use.一 frequency. The control signal is based on the frequency of the transformer 14 itself, and the user determines the corresponding frequency value of the drive system 1 and the transformer 14 through the user. That is, the input terminal 172 of the voltage-controlled oscillation circuit 17 of the voltage control circuit 17 of the driving system 1 provides an oscillation frequency to the counting circuit 123, and then the switching signal generated by the pulse wave control processing circuit 12 is used. No. determines the switching frequency of the changeover switch 7, and under different load conditions, the oscillation frequency provided by the oscillating circuit 17 can be controlled by adjusting the voltage to increase the efficiency of the drive system 1.
脈波控制處理電路12產生之切換訊號為脈波寬度調變訊號(Pulse Width Modulation，PWM)，脈波控制處理電路12透過具有不同責任週期之脈波寬度調變訊號控制切換開關7的作動，以調節發光元件9之驅動電流。如前所述，當交流電源最大位準值為110V時，編碼電路120產生3~5組編碼資料，使脈波控制處理電路12產生切換訊號控制切換開關7，而調整驅動電流分為3~5階；當交流電源最大位準值為220V時，編碼電路120產生5~9組編碼資料，使脈波控制處理電路12產生切換訊號控制切換開關7，而調整驅動電流分為5~9階。因此交流電源之電壓越大，切換訊號控制產生之驅動電流越少，進而達到主動功因修正之效。請一併參閱第八圖，其為本發明之發光元件之驅動系統之第一實施例的脈波寬度調變訊號數值圖。如圖所示，LATCH欄位之數值為0，代表閂鎖電路121記錄量化電路11量化處理後之交流電源5的電壓為110V，LATCH欄位之數值為1，代表閂鎖電路121記錄量化電路11量化處理後之交流電源5的電壓為220V。當LATCH欄位為0時，係運算出四組切換訊號，LATCH欄位為1時，係運算出八組切換訊號。以LATCH欄位為0時做一舉例說明，當C0~C2之真值表為000，代表解碼電路122輸出之脈波寬度調變訊號的責任週期為50%，其經由比較電路124運算計數電路123以及解碼電路122傳輸之訊號取得128的位元訊號值，當C0~C2之真值表為001，代表解碼電路122輸出之脈波寬度調變訊號的責任週期為40%，其經由比較電路124運算計數電路123以及解碼電路122傳輸之訊號取得102的位元訊號值，當C0~C2之真值表為010，代表解碼電路122輸出之脈波寬度調變訊號的責任週期為25%，其經由比較電路124運算計數電路123以及解碼電路122傳輸之訊號取得64的位元訊號值，當C0~C2之真值表為011，代表解碼電路122輸出之脈波寬度調變訊號的責 任週期為12%，其經由比較電路124運算計數電路123以及解碼電路122傳輸之訊號取得31的位元訊號值。 The switching signal generated by the pulse wave control processing circuit 12 is a pulse width modulation signal (Pulse Width Modulation, PWM). The pulse wave control processing circuit 12 controls the operation of the switching switch 7 through the pulse width modulation signal having different duty cycles. In order to adjust the driving current of the light-emitting element 9. As mentioned earlier, when the maximum level value of the AC power supply is 110V, the encoding circuit 120 generates 3 to 5 sets of encoded data, so that the pulse wave control processing circuit 12 generates a switching signal to control the switching switch 7 and adjusts the driving current into 3 ~ 5th order; when the maximum level value of the AC power supply is 220V, the encoding circuit 120 generates 5-9 sets of encoded data, so that the pulse wave control processing circuit 12 generates a switching signal to control the switching switch 7, and the adjustment of the driving current is divided into 5-9th steps . Therefore, the greater the voltage of the AC power source, the less the driving current generated by the switching signal control, thereby achieving the effect of active power factor correction. Please refer to FIG. 8 together, which is a numerical diagram of the pulse width modulation signal of the first embodiment of the driving system of the light-emitting element of the present invention. As shown in the figure, the value of the LATCH field is 0, which means that the voltage of the AC power source 5 after the quantization process of the quantization circuit 11 recorded by the latch circuit 121 is 110V, and the value of the LATCH field is 1, which indicates that the quantization circuit is recorded by the latch circuit 121. The voltage of the AC power source 5 after the quantization process is 220V. When the LATCH field is 0, four groups of switching signals are calculated. When the LATCH field is 1, eight groups of switching signals are calculated. Take the LATCH field as 0 for an example. When the true value table of C0 ~ C2 is 000, it means that the duty cycle of the pulse width modulation signal output by the decoding circuit 122 is 50%, and it operates the counting circuit via the comparison circuit 124. The signals transmitted by 123 and decoding circuit 122 obtain 128 bit signal values. When the truth value table of C0 ~ C2 is 001, it means that the duty cycle of the pulse width modulation signal output by decoding circuit 122 is 40%, which is passed through the comparison circuit. The signals transmitted by the 124 operation counting circuit 123 and the decoding circuit 122 obtain the bit signal value of 102. When the truth table of C0 ~ C2 is 010, it means that the duty cycle of the pulse width modulation signal output by the decoding circuit 122 is 25%. The 64-bit signal value is obtained by calculating the signals transmitted by the counting circuit 123 and the decoding circuit 122 through the comparison circuit 124. When the true value table of C0 ~ C2 is 011, it represents the responsibility of the pulse width modulation signal output by the decoding circuit 122. The duty cycle is 12%. The comparison circuit 124 calculates the signal transmitted by the counting circuit 123 and the decoding circuit 122 to obtain a 31-bit signal value.
復參閱第一、二圖，並請一併參閱第九圖，其為本發明之LED發光元件之主動功因修正驅動系統之第一實施例的緩衝電路示意圖。如圖所示，脈波控制處理電路12產生複數個不同責任週期之脈波寬度調變訊號後，其係與一五輸入的及閘(AND gate)之其中之一腳位耦接，該及閘(AND gate)之其他腳位並與三個比較器、軟啟動(Soft start)電路耦接，以將所有運算完成之訊號於五輸入的及閘(AND gate)之輸出端輸出至緩衝電路13，而開始操控切換開關7；其中，第一組比較器接收驅動系統1之COMP腳位所接收的訊號分離器19之高頻調變訊號，以及參考電壓電路40提供之訊號Vref進行比較後，傳輸至五輸入的及閘(AND gate)之其中一腳位。第一組比較器用以判斷發光元件9之電壓、電流是否異常/過高，使輸出電壓、電流控制在預期範圍內，若有電壓、電流異常/過高時則斷開切換開關7避免發光元件9燒毀。第二組比較器接收驅動系統1之零點偵測(Zero Current Detection，ZCD)訊號，以及參考電壓電路40提供之訊號Vref進行比較後，傳輸至五輸入的及閘(AND gate)之其中一腳位，進而決定導通切換開關7與否。第三組比較器接收驅動系統1之CS腳位的電流感測訊號，以及參考電壓電路40提供之訊號Vref進行比較後，傳輸至五輸入的及閘(AND gate)之其中一腳位。驅動系統1之CS腳位用以偵測切換開關7之源極電流，以作為一過電流保護，當CS腳位之電壓大於參考電壓Vref時，五輸入的及閘(AND gate)之輸出端切至0狀態，而短暫切斷切換開關7之電流。軟啟動(Soft start)電路之電壓在驅動系統1啟動後逐漸上升，直至大於參考電壓Vref，五輸入的及閘(AND gate)之輸出端才開始有訊號傳輸至緩衝電路13，目的係用以避免驅動系統1啟動時，其高電流瞬間輸出造成發光元件9耐受度降低而造成損壞。緩衝電路13為一複數組反相器所構成，其作為一增加訊號強度之電路使用，本實施例之緩衝電源路13由4組反相器構成，前兩級 之兩組反相器為低壓驅動，其藉由整流電壓產生之第一驅動電壓V1驅動，後兩級之兩組反相器為高壓驅動，其藉由整流電壓產生之第二驅動電壓V2驅動，第一驅動電壓V1之整流電壓值為5V，第二驅動電壓V2之整流電壓值為9V；其中，緩衝電路13之前、後級的反相器組數，係可根據驅動系統1之作動需求而設置為奇/偶數組。 Please refer to Figs. 1 and 2 again, and please refer to Fig. 9 together, which is a schematic diagram of the buffer circuit of the first embodiment of the active power factor correction driving system of the LED light emitting device of the present invention. As shown in the figure, after the pulse wave control processing circuit 12 generates a plurality of pulse width modulation signals with different duty cycles, it is coupled to one of the five-input AND gate pins, and The other pins of the AND gate are coupled to the three comparators and the soft start circuit to output all the signals of the operation completion to the output terminal of the five-input AND gate to the buffer circuit. 13 and start to operate the switch 7; among them, the first group of comparators receives the high-frequency modulation signal of the signal separator 19 received by the COMP pin of the driving system 1, and the signal Vref provided by the reference voltage circuit 40 is compared. , Transmitted to one of the five-input AND gates. The first group of comparators is used to determine whether the voltage and current of the light-emitting element 9 are abnormal / excessive, so that the output voltage and current are controlled within the expected range. If the voltage or current is abnormal / high, the switch 7 is turned off to avoid the light-emitting element. 9 burned. The second group of comparators receives the Zero Current Detection (ZCD) signal of the drive system 1 and the signal Vref provided by the reference voltage circuit 40 for comparison, and transmits it to one of the five-input AND gates. Bit to determine whether to turn on the switch 7 or not. The third group of comparators receives the current sensing signal of the CS pin of the driving system 1 and the signal Vref provided by the reference voltage circuit 40 for comparison, and then transmits it to one of the five-input AND gates. The CS pin of the drive system 1 is used to detect the source current of the switch 7 as an overcurrent protection. When the voltage of the CS pin is greater than the reference voltage Vref, the five-input AND gate output terminal Switch to 0 state, and cut off the current of the switch 7 for a short time. The voltage of the soft start circuit gradually rises after the drive system 1 is started, and until the voltage is greater than the reference voltage Vref, the signal of the five-input AND gate output terminal starts to transmit signals to the buffer circuit 13 for the purpose of Avoiding damage to the light-emitting element 9 due to its high current instantaneous output when the drive system 1 starts. The buffer circuit 13 is composed of a complex array of inverters, which is used as a circuit for increasing signal strength. The buffer power circuit 13 of this embodiment is composed of four groups of inverters, the first two stages The two sets of inverters are driven by a low voltage, which are driven by a first drive voltage V1 generated by the rectified voltage, and the two sets of inverters of the latter two stages are driven by a high voltage, which are driven by a second drive voltage V2 generated by the rectified voltage. The rectified voltage value of the first drive voltage V1 is 5V, and the rectified voltage value of the second drive voltage V2 is 9V. Among them, the number of inverter groups before and after the buffer circuit 13 can be based on the operating requirements of the drive system 1. And set to odd / even array.
脈波控制處理電路12產生之該些脈波寬度調變訊號，其責任週期以遞減方式改變而傳輸至緩衝電路13，而由緩衝電路13輸出的訊號控制切換開關7。當驅動系統1一開始的輸入電壓較低時，可以透過調整脈波寬度調變訊號之責任週期，而控制切換開關7之開、關狀態，以調節發光元件9之驅動電流的輸送方式。之後當輸入電壓逐漸升高後，則可逐漸減少脈波寬度調變訊號之責任週期，以穩定維持發光元件9之驅動電流保持一設定值，藉此避免輸入電壓瞬間提供高電流而損害發光元件9，進而達到驅動系統1之主動功率因數修正之效；其中，發光元件9可為一發光二極體，或者是複數個發光二極體以串聯、並聯或串並聯方式所電性連接組成，切換開關7可為一功率電晶體Q1。 The pulse width modulation signals generated by the pulse wave control processing circuit 12 are transmitted to the buffer circuit 13 in a decreasing manner, and the signals output by the buffer circuit 13 control the switch 7. When the input voltage at the beginning of the driving system 1 is low, the on / off state of the switch 7 can be controlled by adjusting the duty cycle of the pulse width modulation signal to adjust the driving current transmission mode of the light-emitting element 9. After the input voltage is gradually increased, the duty cycle of the pulse width modulation signal can be gradually reduced to maintain the driving current of the light-emitting element 9 at a set value, thereby avoiding that the input voltage instantly provides a high current and damages the light-emitting element. 9, thereby achieving the effect of active power factor correction of the driving system 1. Among them, the light-emitting element 9 can be a light-emitting diode, or a plurality of light-emitting diodes can be electrically connected in series, parallel, or series-parallel connection. The switch 7 can be a power transistor Q1.
請參閱第十圖以及第十一圖，其為本發明之LED發光元件之主動功因修正驅動系統之第二實施例的方塊圖，以及脈波控制處理電路方塊圖。如圖所示，本發明之第二實施例與第一實施例之差異，在於脈波控制處理電路12取得複數轉態電壓值TR0~TR6後，係歷經編碼、解碼、計數、比較以及並入串出等電路進行處理以產生兩組切換訊號。脈波控制處理電路12包含一編碼電路120、一解碼電路122、一計數電路123、一比較電路124、一移位暫存電路125、一第一輸出端126以及一第二輸出端127。當編碼電路120取得該些數位訊號(即轉態電壓訊號TR0~TR6)進行編碼後，係將編輯完成之資料傳送至解碼電路122，解碼電路122接受編碼訊號進行解碼後，分別傳送解碼訊號至比較電路124與移位暫存電路125。同時，計數電路123、移位暫存電路125由一壓控震盪電路17提供一頻率供其運作，計數電路123計數完成之訊號，一者 傳輸至比較電路124，另一者並連接一反及閘(NAND gate)，以將計數完成之訊號經由反及閘(NAND gate)運算而傳送至移位暫存電路125。 Please refer to FIG. 10 and FIG. 11, which are block diagrams of a second embodiment of an active power factor correction driving system of an LED light emitting element of the present invention, and a block diagram of a pulse wave control processing circuit. As shown in the figure, the difference between the second embodiment and the first embodiment of the present invention lies in that after the pulse wave control processing circuit 12 obtains the complex transition voltage values TR0 to TR6, it undergoes encoding, decoding, counting, comparison, and merging. Circuits such as serialization are processed to generate two sets of switching signals. The pulse wave control processing circuit 12 includes an encoding circuit 120, a decoding circuit 122, a counting circuit 123, a comparison circuit 124, a shift register circuit 125, a first output terminal 126, and a second output terminal 127. After the encoding circuit 120 obtains the digital signals (ie, the transition voltage signals TR0 to TR6) for encoding, it transmits the edited data to the decoding circuit 122. After the decoding circuit 122 receives the encoded signals for decoding, it sends the decoded signals to The comparison circuit 124 and the shift temporary storage circuit 125. At the same time, the counting circuit 123 and the shift temporary storage circuit 125 are provided by a voltage-controlled oscillator circuit 17 with a frequency for their operation. The signal is transmitted to the comparison circuit 124, and the other is connected to a NAND gate to transmit the signal of counting completion to the shift register circuit 125 through the NAND gate operation.
爾後，比較電路124進行比較解碼訊號與計數訊號產生切換訊號後，由第一輸出端126輸出至緩衝電路13。移位暫存電路125依據解碼電路122以及反及閘(NAND gate)傳送之訊號進行運算，完成後之訊號將傳送至一及閘(AND gate)，及閘(AND gate)作為一遮蓋電路使用，並與壓控震盪電路17耦接，由壓控震盪電路17提供一160KHZ的頻率供其運作，經由及閘(AND gate)進行運算後傳輸至第二輸出端127，再由第二輸出端127輸出至緩衝電路13。第一輸出端126傳輸之訊號即為一第一組切換訊號，其為脈波寬度調變訊號(PWM)，第二輸出端127傳輸之訊號為一第二組切換訊號，其為一脈波寬度固定、脈波出現時間可變之頻率調變訊號，即脈波頻率調變訊號(Pulse Frequency Modulation，PFM)，第一輸出端126以及第二輸出端127皆耦接至緩衝電路123；其中，該編碼電路120為8-3編碼器，解碼電路122為3-8解碼器，計數電路123為3位元(bits)計數器，移位暫存電路125為8位元(bits)並入串出移位暫存器。 After that, the comparison circuit 124 compares the decoded signal with the count signal to generate a switching signal, and then outputs it to the buffer circuit 13 through the first output terminal 126. The shift temporary storage circuit 125 performs calculations based on the signals transmitted by the decoding circuit 122 and the anti-NAND gate. After completion, the signals will be transmitted to an AND gate, and the AND gate is used as a cover circuit. , And is coupled to the voltage-controlled oscillation circuit 17, which provides a frequency of 160KHZ for its operation, and transmits it to the second output terminal 127 after calculation by the AND gate, and then the second output terminal 127 is output to the buffer circuit 13. The signal transmitted by the first output terminal 126 is a first group of switching signals, which is a pulse width modulation signal (PWM), and the signal transmitted by the second output terminal 127 is a second group of switching signals, which is a pulse wave. A frequency modulation signal with a fixed width and a variable pulse appearance time, that is, a Pulse Frequency Modulation (PFM) signal. The first output terminal 126 and the second output terminal 127 are coupled to the buffer circuit 123; The encoding circuit 120 is an 8-3 encoder, the decoding circuit 122 is a 3-8 decoder, the counting circuit 123 is a 3-bits counter, and the shift temporary storage circuit 125 is an 8-bits parallel to the string. Out of the shift register.
本發明之第二實施例的驅動系統1係可根據使用者欲搭配之負載規格，而決定提供其中一組切換訊號供其運作。例如，當負載(第一組發光元件9)之規格較適用於第一輸出端126所產生之第一組切換訊號(PWM)時，即可由使用者操作驅動系統1之第一輸出端126與緩衝電路13之電性連接關係處於導通狀態，而將第一輸出端126之第一組切換訊號傳輸至緩衝電路13，透過緩衝電路13將第一組切換訊號輸送至切換開關7進行操控，以調節發光元件9之驅動電流的輸送方式(即透過不同責任週期之脈波寬度調變訊號進行控制)。又，倘若使用者判斷驅動系統1欲搭配之負載(第二組發光元件9)較適用於第二輸出端127所產生之第二組切換訊號(PFM)，亦可由使用者操作驅動系統1之第二輸出端127與緩衝電路13之電性連接關係處於導通狀態，而將第二輸出端127之第 二組切換訊號傳輸至緩衝電路13，透過緩衝電路13將第二組切換訊號輸送至切換開關7進行操控，以調節發光元件9之驅動電流的輸送方式(即透過頻率變化之脈波頻率調變訊號進行控制)。於此，本發明之第二實施例的驅動系統1係可達到輸出脈波寬度調變訊號或者是脈波頻率調變訊號，與連接之發光元件9匹配，達到驅動系統1最佳化輸出之效果。 The drive system 1 according to the second embodiment of the present invention may decide to provide one of a set of switching signals for its operation according to the load specifications that the user wants to match. For example, when the specifications of the load (the first group of light-emitting elements 9) are more suitable for the first group of switching signals (PWM) generated by the first output terminal 126, the first output terminal 126 of the drive system 1 and the user can operate the The electrical connection relationship of the buffer circuit 13 is in a conducting state, and the first group of switching signals of the first output terminal 126 is transmitted to the buffer circuit 13, and the first group of switching signals is transmitted to the switch 7 through the buffer circuit 13 to be controlled to Adjust the transmission mode of the driving current of the light-emitting element 9 (that is, control by pulse width modulation signals of different duty cycles). In addition, if the user judges that the load (the second group of light-emitting elements 9) to be driven by the driving system 1 is more suitable for the second group of switching signals (PFM) generated by the second output terminal 127, the user can also operate the driving system 1 The electrical connection relationship between the second output terminal 127 and the buffer circuit 13 is in a conducting state, and the second output terminal 127 The two sets of switching signals are transmitted to the buffer circuit 13, and the second group of switching signals are transmitted to the switch 7 through the buffer circuit 13 to control the transmission mode of the driving current of the light emitting element 9 (that is, the pulse wave frequency modulation through frequency change) Signal for control). Here, the drive system 1 of the second embodiment of the present invention can output the pulse width modulation signal or the pulse frequency modulation signal, which matches the connected light-emitting element 9 to achieve the optimized output of the drive system 1. effect.
綜上所述，本發明教示之LED發光元件之主動功因修正驅動系統，其經由啟動電路、量化電路以及脈波控制處理電路產生切換訊號，並透過切換訊號之PWM的責任週期變化，或者是PFM的脈波出現時間變化，以控制切換開關之作動方式，進而達到改善驅動系統之功率因數修正、穩壓，以使本發明之驅動系統具有較佳之使用效能。 In summary, the active power factor correction driving system of the LED light-emitting element taught by the present invention generates a switching signal through a start circuit, a quantization circuit, and a pulse wave control processing circuit, and changes the duty cycle of the PWM through the switching signal, or The PFM pulse wave changes in time to control the operation mode of the changeover switch, so as to improve the power factor correction and voltage stabilization of the driving system, so that the driving system of the present invention has better use efficiency.
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| CN102497699A (en) * | 2011-12-05 | 2012-06-13 | 北方工业大学 | Method for adjusting brightness of LED (light emitting diode) illuminating lamp and LED driving circuit for PF (power factor) light dimming function |
| TWM464962U (en) * | 2013-07-01 | 2013-11-01 | Univ Nat Formosa | Self-oscillating and single stage high power factor led driver circuit |
| TWI442812B (en) * | 2011-07-25 | 2014-06-21 | Fsp Technology Inc | Load driving apparatus and method thereof |
| US9018855B2 (en) * | 2010-12-30 | 2015-04-28 | Silergy Semiconductor Technology (Hangzhou) Ltd. | Controlling circuit for an LED driver and controlling method thereof |
| CN205883637U (en) * | 2016-07-04 | 2017-01-11 | 浙江英飞特光电有限公司 | LED light modulation circuit |
| US9717122B2 (en) * | 2014-12-31 | 2017-07-25 | Sengled Optoelectronics Co., Ltd | Dimming circuit and dimming system suitable for SCR dimmer circuit |
-
2017
- 2017-08-14 TW TW106127510A patent/TWI665935B/en not_active IP Right Cessation
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9018855B2 (en) * | 2010-12-30 | 2015-04-28 | Silergy Semiconductor Technology (Hangzhou) Ltd. | Controlling circuit for an LED driver and controlling method thereof |
| TWI442812B (en) * | 2011-07-25 | 2014-06-21 | Fsp Technology Inc | Load driving apparatus and method thereof |
| CN102497699A (en) * | 2011-12-05 | 2012-06-13 | 北方工业大学 | Method for adjusting brightness of LED (light emitting diode) illuminating lamp and LED driving circuit for PF (power factor) light dimming function |
| TWM464962U (en) * | 2013-07-01 | 2013-11-01 | Univ Nat Formosa | Self-oscillating and single stage high power factor led driver circuit |
| US9717122B2 (en) * | 2014-12-31 | 2017-07-25 | Sengled Optoelectronics Co., Ltd | Dimming circuit and dimming system suitable for SCR dimmer circuit |
| CN205883637U (en) * | 2016-07-04 | 2017-01-11 | 浙江英飞特光电有限公司 | LED light modulation circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201911968A (en) | 2019-03-16 |
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| MM4A | Annulment or lapse of patent due to non-payment of fees |