TW201318478A - Dynamically adjusting dimming range driving apparatus and method thereof - Google Patents
Dynamically adjusting dimming range driving apparatus and method thereof Download PDFInfo
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本發明是有關於一種可調光之發光二極體驅動裝置及其操作方法，且特別是有關於一種可動態調整調光範圍之發光二極體驅動裝置及其操作方法。The invention relates to a dimmable light-emitting diode driving device and an operating method thereof, and in particular to a light-emitting diode driving device capable of dynamically adjusting a dimming range and an operating method thereof.
發光二極體之發光亮度主要係由輸入發光二極體之電流大小所決定，在習知技術中，為調整發光二極體之發光亮度，可利用一調光器先對市電輸入的交流電源進行相位調變後輸出一相位調變交流電源控制發光二極體亮度。The brightness of the light-emitting diode is mainly determined by the current of the input light-emitting diode. In the prior art, in order to adjust the light-emitting brightness of the light-emitting diode, a dimmer can be used to input the AC power of the mains. After the phase modulation is performed, a phase modulation AC power source is output to control the brightness of the LED.
一般用於燈具上的調光裝置，大多是利用閘流電晶體來進行相位控制改變導電角的大小，達控制發光二極體亮度之目的。若相位調變後所得到的電壓準位較小，則輸入發光二極體的電流亦相對變小，因而使發光二極體的亮度降低；反之若提高所得到的電壓準位，則能增加發光二極體之亮度。Generally used for dimming devices on lamps, most of them use thyristor to perform phase control to change the size of the conductive angle to control the brightness of the LED. If the voltage level obtained after the phase modulation is small, the current input to the light-emitting diode is relatively small, thereby reducing the brightness of the light-emitting diode; if the voltage level obtained is increased, the current can be increased. The brightness of the light-emitting diode.
在傳統技術上，進行相位調光功能之發光二極體驅動器是使用固定電容量的電容器來決定輸出脈衝信號之工作週期。由於電容量固定，一旦調光至電壓準位較小，造成輸出到發光二極體的電流漣波較大，會導致發光二極體光輸出不穩定而有閃爍發光現像。此外，電容量固定更會造成調光範圍受限。In the conventional art, a light-emitting diode driver that performs a phase dimming function uses a capacitor of a fixed capacitance to determine a duty cycle of an output pulse signal. Since the capacitance is fixed, once the dimming to the voltage level is small, the current ripple to the LED is large, which may result in unstable light output of the LED and flickering. In addition, the fixed capacity will result in limited dimming range.
因此，如何改良上述發光二極體驅動電路之缺點即成為追求之目標。Therefore, how to improve the shortcomings of the above-described light-emitting diode driving circuit has become a goal.
本發明主要提供一種動態調整功因控制單元之電容值，使得調光器在進行亮度調整時，不受功因控制單元固定電容值之限制，而可有擴大整體調光範圍。The invention mainly provides a dynamic adjustment of the capacitance value of the power factor control unit, so that the dimmer is not limited by the fixed capacitance value of the power factor control unit when performing the brightness adjustment, and the overall dimming range can be expanded.
根據本發明之一態樣，主要是提供一種可動態調整調光範圍之驅動裝置，至少包括：一調光單元，用以調變一交流電壓並將該調變後之交流電壓整流成一第一直流驅動電壓；一電壓轉換單元，根據一導通時間將該第一直流驅動電壓轉換成一第二直流驅動電壓；一發光單元，根據該第二直流驅動電壓進行發光；以及一功因控制單元，用以控制該導通時間，其中當該第一直流驅動電壓大於一臨界電壓值時，該功因控制單元根據一第一電容值控制該導通時間，以及當該第一直流驅動電壓小於該臨界電壓值時，該功因控制單元根據一第二電容值控制該導通時間，其中該第二電容值小於該第一電容值。According to an aspect of the present invention, a driving device capable of dynamically adjusting a dimming range is provided, and at least includes: a dimming unit configured to modulate an alternating voltage and rectify the modulated alternating current into a first a DC drive voltage; a voltage conversion unit that converts the first DC drive voltage into a second DC drive voltage according to an on-time; an illumination unit that emits light according to the second DC drive voltage; and a power factor control unit And controlling the on-time, wherein when the first DC driving voltage is greater than a threshold voltage, the power factor control unit controls the conduction time according to a first capacitance value, and when the first DC driving voltage is less than At the threshold voltage value, the power factor control unit controls the conduction time according to a second capacitance value, wherein the second capacitance value is less than the first capacitance value.
在一實施例中，更包括一回授單元，將發光單元之發光結果迴授給功因控制單元用以控制該導通時間。In an embodiment, a feedback unit is further included, and the illumination result of the illumination unit is returned to the power factor control unit for controlling the conduction time.
在一實施例中，更包括一第一電容以及一第二電容，當該第一直流驅動電壓大於該臨界電壓值時，該第一電容與第二電容並聯來提供該第一電容值控制該導通時間，以及當該第一直流驅動電壓小於該臨界電壓值時，截止該第一電容與第二電容並聯，根據該第一電容提供之該第二電容值控制該導通時間。In an embodiment, the method further includes a first capacitor and a second capacitor. When the first DC driving voltage is greater than the threshold voltage, the first capacitor is connected in parallel with the second capacitor to provide the first capacitor value control. The on-time, and when the first DC driving voltage is less than the threshold voltage, the first capacitor is turned off in parallel with the second capacitor, and the second capacitor is controlled according to the second capacitor.
在一實施例中，更包括一切換元件，其中該切換元件之一端接地，另一端耦接該第二電容，當該第一直流驅動電壓大於該臨界電壓值時，該切換元件導通，使得該第一電容與該第二電容並聯，以及當該第一直流驅動電壓小於該臨界電壓值時，該切換元件截止。In one embodiment, the switching component is further connected to the second capacitor, and the other component is coupled to the second capacitor. When the first DC driving voltage is greater than the threshold voltage, the switching component is turned on. The first capacitor is connected in parallel with the second capacitor, and when the first DC driving voltage is less than the threshold voltage value, the switching element is turned off.
在一實施例中，更包括一第一電容以及一第二電容，當該第一直流驅動電壓大於該臨界電壓值時，截止該第一電容與第二電容間之連接，根據該第一電容提供之該第一電容值以控制該導通時間，以及當該第一直流驅動電壓小於該臨界電壓值時，該第一電容與第二電容串聯來提供該第二電容值以控制該導通時間。In an embodiment, the method further includes a first capacitor and a second capacitor. When the first DC driving voltage is greater than the threshold voltage, the connection between the first capacitor and the second capacitor is cut off, according to the first The capacitor provides the first capacitance value to control the conduction time, and when the first DC driving voltage is less than the threshold voltage value, the first capacitor is connected in series with the second capacitor to provide the second capacitance value to control the conduction time.
在一實施例中，更包括一切換元件，其中該切換元件之一端接地，另一端耦接該第一電容與該第二電容之共同接點，當該第一直流驅動電壓大於該臨界電壓值時，該切換元件導通，使得該第一電容接地，以及當該第一直流驅動電壓小於該臨界電壓值時，該切換元件截止，使得該第一電容與該第二電容串聯。In one embodiment, the device further includes a switching component, wherein one end of the switching component is grounded, and the other end is coupled to the common junction of the first capacitor and the second capacitor, when the first DC driving voltage is greater than the threshold voltage When the value is up, the switching element is turned on, so that the first capacitor is grounded, and when the first DC driving voltage is less than the threshold voltage value, the switching element is turned off, so that the first capacitor is connected in series with the second capacitor.
在一實施例中，其中該功因控制單元產生一脈波寬度調變信號切換一開關，來控制該電壓轉換單元，根據該導通時間將該第一直流驅動電壓轉換成該第二直流驅動電壓。In an embodiment, the power factor control unit generates a pulse width modulation signal switching switch to control the voltage conversion unit, and converts the first DC driving voltage into the second DC driving according to the conduction time. Voltage.
在一實施例中，更包括一切換元件耦接該功因控制單元，其中當該第一直流驅動電壓低於一預設電壓時，終止提供一電源給該功因控制單元。In an embodiment, a switching component is further coupled to the power factor control unit, wherein when the first DC driving voltage is lower than a predetermined voltage, the power supply to the power factor control unit is terminated.
在一實施例中，該發光單元為一發光二極體單元。In an embodiment, the light emitting unit is a light emitting diode unit.
在一實施例中，該電壓轉換單元為一返馳式轉換器。In an embodiment, the voltage conversion unit is a flyback converter.
根據本發明之另一態樣，主要是提供一種動態調整調光範圍之方法，至少包括：調變一交流電壓並將該調變後之交流電壓整流成一第一直流驅動電壓；根據一導通時間將該第一直流驅動電壓轉換成一第二直流驅動電壓，其中當該第一直流驅動電壓大於一臨界電壓值時，根據一第一電容值控制該導通時間，以及當該第一直流驅動電壓小於該臨界電壓值時，根據一第二電容值控制該導通時間，其中該第二電容值小於該第一電容值；以及使用該第二直流驅動電壓驅動一發光單元發光。According to another aspect of the present invention, a method for dynamically adjusting a dimming range is provided, which at least includes: modulating an AC voltage and rectifying the modulated AC voltage into a first DC driving voltage; Time converting the first DC driving voltage into a second DC driving voltage, wherein when the first DC driving voltage is greater than a threshold voltage value, controlling the conduction time according to a first capacitance value, and when the first direct When the flow driving voltage is less than the threshold voltage value, the conduction time is controlled according to a second capacitance value, wherein the second capacitance value is smaller than the first capacitance value; and the second DC driving voltage is used to drive a light emitting unit to emit light.
在一實施例中，更包括當該第一直流驅動電壓大於該臨界電壓值時，並聯一第一電容以及一第二電容來提供該第一電容值控制該導通時間，以及當該第一直流驅動電壓小於該臨界電壓值時，截止該第一電容與第二電容並聯，根據該第一電容提供之該第二電容值控制該導通時間。In an embodiment, the method further includes: when the first DC driving voltage is greater than the threshold voltage, paralleling a first capacitor and a second capacitor to provide the first capacitor value to control the on time, and when the first When the DC driving voltage is less than the threshold voltage, the first capacitor is connected in parallel with the second capacitor, and the second capacitor value is controlled according to the second capacitor value.
在一實施例中，更包括提供一切換元件，其中該切換元件之一端接地，另一端耦接該第二電容，當該第一直流驅動電壓大於該臨界電壓值時，控制該切換元件導通，使得該第一電容與該第二電容並聯，以及當該第一直流驅動電壓小於該臨界電壓值時，控制該切換元件截止。In an embodiment, the method further includes providing a switching component, wherein one end of the switching component is grounded, and the other end is coupled to the second capacitor, and when the first DC driving voltage is greater than the threshold voltage, the switching component is controlled to be turned on. The first capacitor is connected in parallel with the second capacitor, and when the first DC driving voltage is less than the threshold voltage, the switching element is controlled to be turned off.
在一實施例中，更包括當該第一直流驅動電壓小於該臨界電壓值時，控制一第一電容串聯一第二電容來提供該第二電容值以控制該導通時間，以及當該第一直流驅動電壓大於該臨界電壓值時，截止該第一電容與第二電容間之連接，根據該第一電容提供之該第一電容值控制該導通時間。In an embodiment, the method further includes: when the first DC driving voltage is less than the threshold voltage, controlling a first capacitor in series with a second capacitor to provide the second capacitor value to control the on time, and when the first When a DC driving voltage is greater than the threshold voltage, the connection between the first capacitor and the second capacitor is cut off, and the conduction time is controlled according to the first capacitor value provided by the first capacitor.
在一實施例中，更包括提供一切換元件，其中該切換元件之一端接地，另一端耦接該第一電容與該第二電容之共同接點，當該第一直流驅動電壓大於該臨界電壓值時，控制該切換元件導通，使得該第一電容接地，以及當該第一直流驅動電壓小於該臨界電壓值時，控制該切換元件截止，使得該第一電容與該第二電容串聯。In an embodiment, the method further includes providing a switching component, wherein one end of the switching component is grounded, and the other end is coupled to a common junction of the first capacitor and the second capacitor, when the first DC driving voltage is greater than the threshold When the voltage value is controlled, the switching element is controlled to be turned on, so that the first capacitor is grounded, and when the first DC driving voltage is less than the threshold voltage value, the switching element is controlled to be turned off, so that the first capacitor is connected in series with the second capacitor .
在一實施例中，更包括產生一脈波寬度調變信號切換一開關，來控制該導通時間將該第一直流驅動電壓轉換成該第二直流驅動電壓。In an embodiment, the method further includes generating a pulse width modulation signal switching switch to control the conduction time to convert the first DC driving voltage into the second DC driving voltage.
在一實施例中，更包括當該第一直流驅動電壓低於一預設電壓時，停止產生該脈波寬度調變信號。In an embodiment, the method further includes: stopping generating the pulse width modulation signal when the first DC driving voltage is lower than a predetermined voltage.
在一實施例中，該發光單元為一發光二極體。In an embodiment, the light emitting unit is a light emitting diode.
在一實施例中，係使用一返馳式轉換器將該第一直流驅動電壓轉換成一第二直流驅動電壓。In one embodiment, the first DC drive voltage is converted to a second DC drive voltage using a flyback converter.
本發明係藉由動態調整功因控制單元之時序電容值，來調整開關式電源功率開關切換之導通時間，使得調光器在進行亮度調整時，不受功因控制單元固定電容值之限制，而可有擴大整體調光範圍。此外，本發明更可在亮度被調整至一最低直時，截止功因控制單元之電源供應，來中斷提供電源給發光單元，避免閃爍現像發生。The invention adjusts the on-time of the switching power supply power switch by dynamically adjusting the timing capacitance value of the power factor control unit, so that the dimmer is not limited by the fixed capacitance value of the power factor control unit when performing brightness adjustment. It is possible to expand the overall dimming range. In addition, the present invention can interrupt the supply of power to the light-emitting unit to prevent the occurrence of flickering when the brightness is adjusted to a minimum straightness, and the power supply of the power factor control unit is turned off.
以下為本發明較佳具體實施例以所附圖示加以詳細說明，下列之說明及圖示使用相同之參考數字以表示相同或類似元件，並且在重複描述相同或類似元件時則予省略。The following description of the preferred embodiments of the invention is in the
第1圖所示為根據本發明一實施例之可動態調整調光範圍之發光二極體驅動裝置概略圖。本發明之發光二極體驅動裝置100包括：一調光單元101、一電壓轉換單元102、一發光單元103、一回授單元104、一功因控制單元105、一切換元件SW、一第一切換元件SW1、一第二切換元件SW2、一時序電容C1以及一擴充時序電容C2。其中，外部之交流電源AC透過調光單元101調整其電壓信號之相位並整流成一第一直流驅動電壓VCC1，其中第一直流驅動電壓VCC1提供至電壓轉換單元102。其中功因控制單元105控制一切換元件SW之切換頻率及工作週期，並以電壓轉換單元102轉換成一第二直流驅動電壓VCC2，提供至發光單元103來驅動發光單元103發光。回授單元104偵測此第二直流驅動電壓VCC2，並將其變化訊號提供至功因控制單元105，功因控制單元105根據第二直流驅動電壓VCC2之變化訊號，調節一調變信號之調整切換元件SW切換頻率及工作週期，使得第二直流驅動電壓VCC2維持在一預定值。第一切換元件SW1用以控制擴充時序電容C2之一端接地，當第一切換元件SW1導通時，會使得擴充時序電容C2與時序電容C1構成一並聯結構，使得與功因控制單元105連接之時序電容，從原本之時序電容C1，轉變為並聯之擴充時序電容C2與時序電容C1。Fig. 1 is a schematic view showing a light-emitting diode driving device capable of dynamically adjusting a dimming range according to an embodiment of the present invention. The LED driving device 100 of the present invention comprises: a dimming unit 101, a voltage converting unit 102, a lighting unit 103, a feedback unit 104, a power factor control unit 105, a switching element SW, and a first The switching element SW1, a second switching element SW2, a timing capacitor C1, and an extended timing capacitor C2. The external AC power source AC is adjusted by the dimming unit 101 to adjust the phase of the voltage signal and rectified into a first DC driving voltage VCC1, wherein the first DC driving voltage VCC1 is supplied to the voltage converting unit 102. The power factor control unit 105 controls the switching frequency and the duty cycle of a switching element SW, and is converted into a second DC driving voltage VCC2 by the voltage converting unit 102, and is supplied to the light emitting unit 103 to drive the light emitting unit 103 to emit light. The feedback unit 104 detects the second DC driving voltage VCC2 and supplies the change signal to the power factor control unit 105. The power factor control unit 105 adjusts the adjustment signal according to the change signal of the second DC driving voltage VCC2. The switching element SW switches the frequency and the duty cycle such that the second DC driving voltage VCC2 is maintained at a predetermined value. The first switching element SW1 is configured to control one end of the extended timing capacitor C2 to be grounded. When the first switching element SW1 is turned on, the extended timing capacitor C2 and the timing capacitor C1 form a parallel structure, so that the timing connected to the power factor control unit 105 is connected. The capacitor is changed from the original timing capacitor C1 to the parallel extended timing capacitor C2 and the timing capacitor C1.
第二切換元件SW2用以提供功因控制單元105之電源，當第二切換元件SW2斷開功因控制單元105與一電源間之連接時，功因控制單元105停止動作，不再驅動切換元件SW，使得電壓轉換單元102亦停止動作不再提供二直流驅動電壓VCC2至發光單元103，因此發光單元103停止發光。在一實施例中，例如可設定一截止電壓值，當調光單元101進行亮度調整時，會使得調光單元101輸出之第一直流驅動電壓VCC1發生變化，此時將此第一直流驅動電壓VCC1與設定之截止電壓值進行比較，一旦小於此截止電壓值，控制切換元件SW2截止，斷開功因控制單元105之驅動電源連接。反之，若第一直流驅動電壓VCC1大於截止電壓值，控制切換元件SW2導通，功因控制單元105與驅動電源保持連接。The second switching element SW2 is configured to provide power to the power factor control unit 105. When the second switching element SW2 disconnects the power factor control unit 105 from a power source, the power factor control unit 105 stops operating and no longer drives the switching element. SW, so that the voltage conversion unit 102 also stops operating, no longer supplies the two DC driving voltages VCC2 to the light emitting unit 103, and thus the light emitting unit 103 stops emitting light. In an embodiment, for example, a cutoff voltage value can be set. When the dimming unit 101 performs brightness adjustment, the first DC driving voltage VCC1 output by the dimming unit 101 is changed. The driving voltage VCC1 is compared with the set cutoff voltage value. Once less than the cutoff voltage value, the control switching element SW2 is turned off, and the driving power supply connection of the power factor control unit 105 is turned off. On the other hand, if the first DC driving voltage VCC1 is greater than the OFF voltage value, the control switching element SW2 is turned on, and the power factor control unit 105 is kept connected to the driving power source.
第2圖所示為根據本發明一實施例之可動態調整調光範圍之發光二極體驅動裝置電路圖。調光單元101更包括一調光器1011、一電磁干擾濾波器(electromagnetic interference,EMI)1012以及一整流器1013，電磁干擾濾波器1012連接於交流電壓源AC與整流器1013之間，用以消除交流電壓源AC中之電磁干擾。也就是，電磁干擾濾波器1012會消除脈衝雜訊、諧波等。整流器1013，例如為一橋式整流器，接收來自交流電壓源AC之交流電壓，並將交流電壓全波整流成第一直流驅動電壓VCC1。2 is a circuit diagram of a light-emitting diode driving device capable of dynamically adjusting a dimming range according to an embodiment of the invention. The dimming unit 101 further includes a dimmer 1011, an electromagnetic interference (EMI) 1012, and a rectifier 1013. The electromagnetic interference filter 1012 is connected between the AC voltage source AC and the rectifier 1013 to eliminate the AC. Electromagnetic interference in the voltage source AC. That is, the electromagnetic interference filter 1012 eliminates pulse noise, harmonics, and the like. The rectifier 1013 is, for example, a bridge rectifier that receives an AC voltage from an AC voltage source AC and rectifies the AC voltage into a first DC drive voltage VCC1.
電壓轉換單元102，於一較佳實施例中為一返馳式轉換器(flyback converter)1021。返馳式轉換器1021連接至整流器1013，接收第一直流驅動電壓VCC1，並將其轉換成一第二直流驅動電壓VCC2，以輸出至發光單元103。其中發光單元103，例如為串聯之複數個發光二極體或是並聯之複數個發光二極體。其中返馳式轉換器1021包括一次側繞組N1、二次側繞組N2、二極體Do以及輸出電容Co。切換元件SW控制返馳式轉換器1021之操作。當切換元件SW導通時，第一直流驅動電壓VCC1所產生之電流會流過變壓器之一次側繞組N1，而因二次側繞組N2和一次側繞組N1極性是相反的，所以二極體Do會被逆向偏壓，故沒有能量轉移到負載，此時能量將儲存在變壓器中，輸出端則由輸出電容Co繼續提供能量。當切換元件SW截止時，一次側繞組N1開路，一次側電流降為零，變壓器中的磁通密度將向負的方向改變，所以所有繞組上的電壓將會反轉，並使得二極體Do導通，而磁化電流將會轉移至二次側成為第二直流驅動電壓VCC2，也就是說儲存在變壓器中的能量會經由二極體Do，傳送至輸出電容Co與發光單元103上，讓發光單元103發光。The voltage conversion unit 102, in a preferred embodiment, is a flyback converter 1021. The flyback converter 1021 is connected to the rectifier 1013, receives the first DC drive voltage VCC1, and converts it into a second DC drive voltage VCC2 for output to the light emitting unit 103. The light-emitting unit 103 is, for example, a plurality of light-emitting diodes connected in series or a plurality of light-emitting diodes connected in parallel. The flyback converter 1021 includes a primary side winding N1, a secondary side winding N2, a diode Do, and an output capacitor Co. The switching element SW controls the operation of the flyback converter 1021. When the switching element SW is turned on, the current generated by the first DC driving voltage VCC1 flows through the primary winding N1 of the transformer, and since the polarity of the secondary winding N2 and the primary winding N1 are opposite, the diode Do Will be reverse biased, so no energy is transferred to the load, at which point the energy will be stored in the transformer, and the output will continue to provide energy from the output capacitor Co. When the switching element SW is turned off, the primary side winding N1 is open, the primary side current drop is zero, and the magnetic flux density in the transformer will change in the negative direction, so the voltage on all the windings will be reversed and the diode Do Turning on, and the magnetizing current will be transferred to the secondary side to become the second DC driving voltage VCC2, that is, the energy stored in the transformer will be transmitted to the output capacitor Co and the light emitting unit 103 via the diode Do, so that the light emitting unit 103 light.
回授單元104係用於將發光單元103之輸出電壓和電流訊號提供至功因控制單元105，藉以調整輸出之脈波寬度調變(Pulse Width Modulation,PWM)信號。其中回授單元104至少包括一電壓誤差放大器和一電流誤差放大器，功因控制單元105根據回授單元104回授的電壓誤差和電流誤差訊號，調整切換元件SW的切換頻率，使得傳送至變壓器一次側繞組N1之第一直流驅動電壓VCC1工作週期改變，調整輸入一次側繞組N1功率的大小，以維持第二直流驅動電壓VCC2於一預定值。The feedback unit 104 is configured to provide the output voltage and current signals of the light-emitting unit 103 to the power factor control unit 105, thereby adjusting the output pulse width modulation (PWM) signal. The feedback unit 104 includes at least a voltage error amplifier and a current error amplifier. The power factor control unit 105 adjusts the switching frequency of the switching element SW according to the voltage error and the current error signal fed back by the feedback unit 104, so that the switching frequency of the switching element SW is transmitted to the transformer once. The duty ratio of the first DC driving voltage VCC1 of the side winding N1 is changed, and the power of the input primary winding N1 is adjusted to maintain the second DC driving voltage VCC2 at a predetermined value.
功因控制單元105，用以產生一脈波寬度調變(Pulse Width Modulation,PWM)信號來控制切換元件SW的切換頻率，進而達到對第一直流驅動電壓VCC1波形整形的目的，脈波寬度調變信號控制切換元件SW將第一直流驅動電壓VCC1切成一串電壓脈波，隨後利用電壓轉換單元102將其轉成平滑的第二直流驅動電壓VCC2輸出給發光單元103。The power factor control unit 105 is configured to generate a Pulse Width Modulation (PWM) signal to control the switching frequency of the switching element SW, thereby achieving the purpose of shaping the waveform of the first DC driving voltage VCC1, and the pulse width The modulation signal control switching element SW cuts the first DC driving voltage VCC1 into a series of voltage pulse waves, and then outputs it to the light-emitting unit 103 by using the voltage conversion unit 102 to convert it into a smooth second DC driving voltage VCC2.
如第3圖所示，為一功因控制單元105產生脈波寬度調變信號之概略圖。值得注意的是，於功因控制單元105中僅繪出一比較器301，其他之元件並未繪出。切換元件SW受控於脈衝寬度調變比較器301的VS電壓和VC電壓的比較結果，當VS電壓大於VC電壓時，比較器輸出為高電位，而當VS電壓小於VC電壓時，比較器輸出為低電位。其中，VC電壓為一電壓源VDD對擴充時序電容C2和時序電容C1進行充電時產生之電壓。在一實施例中，若切換元件SW為一NMOS電晶體，電路剛開始運作時，VS電壓大於VC電壓時，比較器輸出為高電位，切換元件SW導通，第一直流驅動電壓VCC1傳輸至電壓轉換單元102將其轉成平滑的第二直流驅動電壓VCC2輸出給發光單元103。電壓源VDD開始對時序電容C1進行充電，VC電壓漸漸升高，一旦VC電壓大於VS電壓時，比較器輸出為低電位，切換元件SW截止。As shown in Fig. 3, a schematic diagram of a pulse width modulation signal is generated by the power factor control unit 105. It should be noted that only one comparator 301 is drawn in the power factor control unit 105, and other components are not drawn. The switching element SW is controlled by the comparison result of the VS voltage and the VC voltage of the pulse width modulation comparator 301. When the VS voltage is greater than the VC voltage, the comparator output is high, and when the VS voltage is less than the VC voltage, the comparator output is Is low. The VC voltage is a voltage generated when a voltage source VDD charges the extended timing capacitor C2 and the timing capacitor C1. In one embodiment, if the switching element SW is an NMOS transistor, when the circuit starts operating, when the VS voltage is greater than the VC voltage, the comparator output is high, the switching element SW is turned on, and the first DC driving voltage VCC1 is transmitted to The voltage conversion unit 102 converts it into a smooth second DC driving voltage VCC2 and outputs it to the light emitting unit 103. The voltage source VDD starts to charge the timing capacitor C1, and the VC voltage gradually rises. When the VC voltage is greater than the VS voltage, the comparator output is low and the switching element SW is turned off.
因此，切換元件SW之切換頻率與導通時間與時序電容C1之電容值有關。若時序電容C1之電容值大，電壓源VDD將時序電容C1充電至大於VS電壓所需之時間較長，因此切換元件SW導通時間較長。反之，若時序電容C1之電容值小，電壓源VDD將時序電容C1充電至大於VS電壓所需之時間較短，因此切換元件SW導通時間較短。由於傳統時序電容C1之電容值是固定的。換言之，一旦採用小電容值之時序電容C1，在進行調光時，當欲將第一直流驅動電壓VCC1調高來增加發光單元103之亮度時，由於採用小電容值之時序電容C1，造成時序電容C1被充電至大於VS電壓所需之時間縮短，導致切換元件SW工作週期受到限制，使得傳輸至第二直流驅動電壓VCC2功率受限，造成發光單元103之發光亮度並未被對等增加。反之，當採用大電容值之時序電容C1，在進行調光時，當欲將第一直流驅動電壓VCC1調低來降低發光單元103之亮度時，由於採用大電容值之時序電容C1，使得切換元件SW導通時間和工作週期被大幅增加，使得發光單元103之發光亮度並未被對等降低。Therefore, the switching frequency and the on-time of the switching element SW are related to the capacitance value of the timing capacitor C1. If the capacitance value of the timing capacitor C1 is large, the time required for the voltage source VDD to charge the timing capacitor C1 to be greater than the VS voltage is longer, so the switching element SW is turned on for a longer time. On the other hand, if the capacitance value of the timing capacitor C1 is small, the time required for the voltage source VDD to charge the timing capacitor C1 to be greater than the VS voltage is shorter, so the switching element SW has a shorter on-time. Since the capacitance value of the conventional timing capacitor C1 is fixed. In other words, once the small capacitance value of the timing capacitor C1 is used, when the dimming is performed, when the first DC driving voltage VCC1 is to be increased to increase the brightness of the light emitting unit 103, the timing capacitor C1 with a small capacitance value is used. The time required for the timing capacitor C1 to be charged to be greater than the VS voltage is shortened, resulting in a limitation of the switching element SW duty cycle, such that the power transmitted to the second DC driving voltage VCC2 is limited, causing the luminance of the light-emitting unit 103 not to be equalized. . On the other hand, when the timing capacitor C1 with a large capacitance value is used, when the dimming is performed to lower the luminance of the light-emitting unit 103 when the first DC driving voltage VCC1 is to be lowered, the timing capacitor C1 having a large capacitance value is used. The on-time and duty cycle of the switching element SW are greatly increased, so that the luminance of the light-emitting unit 103 is not equally reduced.
換言之，採用固定電容值之時序電容C1，在進行調光時，會有一定之調光範圍。因此如第3圖所示，將時序電容C1並聯一擴充時序電容C2來擴大電容值。同時使用一第一切換元件SW1用以控制擴充時序電容C2是否與時序電容C1並聯，其中第一切換元件SW1之一端接地，另一端與擴充時序電容C2耦接，一控制信號控制第一切換元件SW1之切換。當調光單元101往提高亮度之方向進行調整時，可藉由切換第一切換元件SW1讓擴充時序電容C2與時序電容C1並聯來增加電容值。反之，當調光單元101往降低亮度之方向進行調整時，可藉由切換第一切換元件SW1切斷擴充時序電容C2與時序電容C1間之連接來降低電容值。換言之，在此實施例中，是藉由讓擴充時序電容C2與時序電容C1形成並聯，使原本之小電容值增加而擴大整個調光範圍。因此本實施例，適用於原時序電容C1具一小電容值。此外，在控制第一切換元件SW1之切換，可設定一切換臨界電壓值，當調光單元101進行亮度調整時，會使得調光單元101輸出之第一直流驅動電壓VCC1發生變化，此時將此第一直流驅動電壓VCC1與設定之切換臨界電壓值進行比較，一旦大於此切換臨界電壓值，控制第一切換元件SW1導通，讓擴充時序電容C2與時序電容C1並聯來增加電容值。反之，若第一直流驅動電壓VCC1小於切換臨界電壓值，控制第一切換元件SW1截止，切斷擴充時序電容C2與時序電容C1間之連接來降低整體電容值。In other words, the timing capacitor C1 with a fixed capacitance value has a certain dimming range when dimming is performed. Therefore, as shown in FIG. 3, the timing capacitor C1 is connected in parallel to expand the timing capacitor C2 to expand the capacitance value. At the same time, a first switching element SW1 is used to control whether the extended timing capacitor C2 is connected in parallel with the timing capacitor C1, wherein one end of the first switching element SW1 is grounded, the other end is coupled to the extended timing capacitor C2, and a control signal controls the first switching element. Switching of SW1. When the dimming unit 101 adjusts the direction of increasing the brightness, the capacitance value can be increased by switching the first switching element SW1 to connect the extended timing capacitor C2 in parallel with the timing capacitor C1. On the other hand, when the dimming unit 101 adjusts the direction of decreasing the brightness, the capacitance value can be lowered by switching the connection between the extended timing capacitor C2 and the timing capacitor C1 by switching the first switching element SW1. In other words, in this embodiment, by extending the extended timing capacitor C2 and the timing capacitor C1 in parallel, the original small capacitance value is increased to expand the entire dimming range. Therefore, in this embodiment, the original timing capacitor C1 has a small capacitance value. In addition, when the switching of the first switching element SW1 is controlled, a switching threshold voltage value can be set. When the dimming unit 101 performs brightness adjustment, the first DC driving voltage VCC1 output by the dimming unit 101 is changed. The first DC driving voltage VCC1 is compared with the set switching threshold voltage value. Once greater than the switching threshold voltage value, the first switching element SW1 is controlled to be turned on, and the extended timing capacitor C2 is connected in parallel with the timing capacitor C1 to increase the capacitance value. On the other hand, if the first DC driving voltage VCC1 is less than the switching threshold voltage value, the first switching element SW1 is controlled to be turned off, and the connection between the extended timing capacitor C2 and the timing capacitor C1 is cut off to lower the overall capacitance value.
第4圖所示為根據本發明另一實施例可擴大調光範圍之電路結構。同樣的，於功因控制單元105中僅繪出一比較器301，其他之元件並未繪出。一第一切換元件SW1控制擴充時序電容C2是否與時序電容C1串聯，其中第一切換元件SW1之一端接地，另一端耦接於擴充時序電容C2與時序電容C1之共同連接點上，一控制信號控制第一切換元件SW1之切換。當調光單元101往提高亮度之方向進行調整時，可藉由導通第一切換元件SW1讓時序電容C1接地。反之，當調光單元101往降低亮度之方向進行調整時，可藉由截止第一切換元件SW1，讓擴充時序電容C2與時序電容C1串聯接來降低電容值。換言之，在此實施例中，是藉由讓擴充時序電容C2與時序電容C1形成串聯，使原本之大電容值下降來調節整個調光範圍。因此本實施例，適用於原時序電容C1具一大電容值。相似的，在本實施例中亦可設定一切換臨界電壓值，當調光單元101輸出之第一直流驅動電壓VCC1發生變化，此時將此第一直流驅動電壓VCC1與設定之切換臨界電壓值進行比較，一旦大於此切換臨界電壓值，控制第一切換元件SW1導通，讓時序電容C1接地來增加電容值。反之，若第一直流驅動電壓VCC1小於切換臨界電壓值，控制第一切換元件SW1截止，切斷擴充時序電容C2與時序電容C1間之連接來降低整體電容值。Fig. 4 is a view showing a circuit structure which can expand the dimming range according to another embodiment of the present invention. Similarly, only one comparator 301 is drawn in the power factor control unit 105, and other components are not drawn. A first switching element SW1 controls whether the extended timing capacitor C2 is connected in series with the timing capacitor C1, wherein one end of the first switching element SW1 is grounded, and the other end is coupled to a common connection point of the extended timing capacitor C2 and the timing capacitor C1, a control signal The switching of the first switching element SW1 is controlled. When the dimming unit 101 adjusts in the direction of increasing the brightness, the timing capacitor C1 can be grounded by turning on the first switching element SW1. On the contrary, when the dimming unit 101 adjusts the direction of decreasing the brightness, the expansion timing capacitor C2 and the timing capacitor C1 can be connected in series to cut the capacitance value by turning off the first switching element SW1. In other words, in this embodiment, the entire dimming range is adjusted by causing the extended timing capacitor C2 to be in series with the timing capacitor C1 to lower the original large capacitance value. Therefore, in this embodiment, the original timing capacitor C1 has a large capacitance value. Similarly, in this embodiment, a switching threshold voltage value may also be set, and when the first DC driving voltage VCC1 outputted by the dimming unit 101 changes, the switching threshold of the first DC driving voltage VCC1 and the setting is set at this time. The voltage values are compared. Once greater than the switching threshold voltage value, the first switching element SW1 is controlled to be turned on, and the timing capacitor C1 is grounded to increase the capacitance value. On the other hand, if the first DC driving voltage VCC1 is less than the switching threshold voltage value, the first switching element SW1 is controlled to be turned off, and the connection between the extended timing capacitor C2 and the timing capacitor C1 is cut off to lower the overall capacitance value.
第5圖所示為根據本發明一實施例動態調整調光範圍之流程圖，請參閱第2和5圖。首先於步驟501，對一交流市電進行調整並整流成一第一直流驅動電壓。在一實施中，一調光器1011對一交流市電進行調整藉以降低或提高輸出至發光單元103之電流，此調整後之交流市電經由一整流器1013，例如為一橋式整流器，全波整流成一第一直流驅動電壓VCC1。於步驟502，將第一直流驅動電壓VCC1與設定之切換臨界電壓值進行比較，並於步驟502判斷第一直流驅動電壓VCC1是否大於設定之切換臨界電壓值。Figure 5 is a flow chart showing the dynamic adjustment of the dimming range in accordance with an embodiment of the present invention, see Figures 2 and 5. First, in step 501, an AC mains is adjusted and rectified into a first DC driving voltage. In one implementation, a dimmer 1011 adjusts an AC mains to reduce or increase the current output to the lighting unit 103. The adjusted AC mains is rectified to a first stage via a rectifier 1013, such as a bridge rectifier. A DC drive voltage VCC1. In step 502, the first DC driving voltage VCC1 is compared with the set switching threshold voltage value, and in step 502, it is determined whether the first DC driving voltage VCC1 is greater than a set switching threshold voltage value.
若第一直流驅動電壓VCC1大於設定之切換臨界電壓值，於步驟504，增大電容值來擴大切換元件SW之導通時間，在一實施例中，當調光單元101往提高亮度之方向進行調整時，使得第一直流驅動電壓VCC1大於設定之切換臨界電壓，可如第3圖所示藉由切換第一切換元件SW1讓擴充時序電容C2與時序電容C1並聯來增加電容值。或於另一實施例中，如第4圖所示，讓原本串聯之擴充時序電容C2與時序電容C1中斷連接，來擴大整個電容值。反之，若第一直流驅動電壓VCC1小於設定之切換臨界電壓值，於步驟505，降低電容值來減少切換元件SW之導通時間，在一實施例中，當調光單元101往降低亮度之方向進行調整時，可藉由切換第一切換元件SW1切斷擴充時序電容C2與時序電容C1間之連接來降低電容值。或於另一實施例中，如第4圖所示，讓時序電容C1與擴充時序電容C2進行串聯，來降低整個電容值。接著，於步驟506，根據調整後之電容值調節一脈波寬度調變(PWM)信號。並於步驟507，根據此脈波寬度調變信號將第一直流驅動電壓VCC1轉換成一第二直流驅動電壓VCC2來驅動一發光單元103。If the first DC driving voltage VCC1 is greater than the set switching threshold voltage value, in step 504, the capacitance value is increased to increase the conduction time of the switching element SW. In an embodiment, when the dimming unit 101 is in the direction of increasing the brightness. During the adjustment, the first DC driving voltage VCC1 is made larger than the set switching threshold voltage, and the capacitance value can be increased by switching the first switching element SW1 to connect the extended timing capacitor C2 in parallel with the timing capacitor C1 as shown in FIG. Or in another embodiment, as shown in FIG. 4, the original series-connected extended timing capacitor C2 is disconnected from the timing capacitor C1 to expand the entire capacitance value. On the other hand, if the first DC driving voltage VCC1 is less than the set switching threshold voltage value, in step 505, the capacitance value is decreased to reduce the conduction time of the switching element SW. In an embodiment, when the dimming unit 101 is in the direction of decreasing the brightness. When the adjustment is made, the capacitance value can be lowered by switching the connection between the extended timing capacitor C2 and the timing capacitor C1 by switching the first switching element SW1. Or in another embodiment, as shown in FIG. 4, the timing capacitor C1 is connected in series with the extended timing capacitor C2 to reduce the entire capacitance value. Next, in step 506, a pulse width modulation (PWM) signal is adjusted according to the adjusted capacitance value. In step 507, the first DC driving voltage VCC1 is converted into a second DC driving voltage VCC2 according to the pulse width modulation signal to drive a light emitting unit 103.
第6圖所示為根據本發明另一實施例動態調整調光範圍之流程圖，請參閱第2和6圖。首先於步驟501，對一交流市電進行調整並整流成一第一直流驅動電壓。在一實施例中，一調光器1011對一交流市電進行調整藉以降低或提高輸出至發光單元103之電流，此調整後之交流市電經由一整流器1013，例如為一橋式整流器，全波整流成一第一直流驅動電壓VCC1。接著於步驟601，將此第一直流驅動電壓VCC1與設定之截止電壓值進行比較，並於步驟602，判斷此第一直流驅動電壓VCC1是否大於截止電壓值。若第一直流驅動電壓VCC1小於此截止電壓值，則進行步驟603，斷開功因控制單元105與一電源間之連接時。反之，若第一直流驅動電壓VCC1大於截止電壓值，則進行步驟502，再將第一直流驅動電壓VCC1與設定之切換臨界電壓值進行比較，並於步驟502，將第一直流驅動電壓VCC1與設定之切換臨界電壓值進行比較，並於步驟502判斷第一直流驅動電壓VCC1是否大於設定之切換臨界電壓值。Figure 6 is a flow chart showing the dynamic adjustment of the dimming range in accordance with another embodiment of the present invention, see Figures 2 and 6. First, in step 501, an AC mains is adjusted and rectified into a first DC driving voltage. In one embodiment, a dimmer 1011 adjusts an AC mains to reduce or increase the current output to the lighting unit 103. The adjusted AC mains is rectified into a whole via a rectifier 1013, such as a bridge rectifier. The first DC drive voltage VCC1. Next, in step 601, the first DC driving voltage VCC1 is compared with the set OFF voltage value, and in step 602, it is determined whether the first DC driving voltage VCC1 is greater than the OFF voltage value. If the first DC driving voltage VCC1 is less than the OFF voltage value, then step 603 is performed to disconnect the power factor control unit 105 from a power source. On the other hand, if the first DC driving voltage VCC1 is greater than the cutoff voltage value, step 502 is performed, and the first DC driving voltage VCC1 is compared with the set switching threshold voltage value, and in step 502, the first DC driving is performed. The voltage VCC1 is compared with the set switching threshold voltage value, and in step 502, it is determined whether the first DC driving voltage VCC1 is greater than a set switching threshold voltage value.
若第一直流驅動電壓VCC1大於設定之切換臨界電壓值，於步驟504，增大電容值來擴大切換元件SW之導通時間，在一實施例中，當調光單元101往提高亮度之方向進行調整時，使得第一直流驅動電壓VCC1大於設定之切換臨界電壓，可如第3圖所示藉由切換第一切換元件SW1讓擴充時序電容C2與時序電容C1並聯來增加電容值。或於另一實施例中，如第4圖所示，讓原本串聯之擴充時序電容C2與時序電容C1中斷連接，來擴大整個電容值。反之，若第一直流驅動電壓VCC1小於設定之切換臨界電壓值，於步驟505，降低電容值來減少切換元件SW之導通時間，在一實施例中，當調光單元101往降低亮度之方向進行調整時，可藉由切換第一切換元件SW1切斷擴充時序電容C2與時序電容C1間之連接來降低電容值。或於另一實施例中，如第4圖所示，讓時序電容C1與擴充時序電容C2進行串聯，來降低整個電容值。接著，於步驟506，根據調整後之電容值調節一脈波寬度調變(PWM)信號。並於步驟507，根據此脈波寬度調變信號將第一直流驅動電壓VCC1轉換成一第二直流驅動電壓VCC2來驅動一發光單元103。If the first DC driving voltage VCC1 is greater than the set switching threshold voltage value, in step 504, the capacitance value is increased to increase the conduction time of the switching element SW. In an embodiment, when the dimming unit 101 is in the direction of increasing the brightness. During the adjustment, the first DC driving voltage VCC1 is made larger than the set switching threshold voltage, and the capacitance value can be increased by switching the first switching element SW1 to connect the extended timing capacitor C2 in parallel with the timing capacitor C1 as shown in FIG. Or in another embodiment, as shown in FIG. 4, the original series-connected extended timing capacitor C2 is disconnected from the timing capacitor C1 to expand the entire capacitance value. On the other hand, if the first DC driving voltage VCC1 is less than the set switching threshold voltage value, in step 505, the capacitance value is decreased to reduce the conduction time of the switching element SW. In an embodiment, when the dimming unit 101 is in the direction of decreasing the brightness. When the adjustment is made, the capacitance value can be lowered by switching the connection between the extended timing capacitor C2 and the timing capacitor C1 by switching the first switching element SW1. Or in another embodiment, as shown in FIG. 4, the timing capacitor C1 is connected in series with the extended timing capacitor C2 to reduce the entire capacitance value. Next, in step 506, a pulse width modulation (PWM) signal is adjusted according to the adjusted capacitance value. In step 507, the first DC driving voltage VCC1 is converted into a second DC driving voltage VCC2 according to the pulse width modulation signal to drive a light emitting unit 103.
綜合上述所言，本發明係藉由動態調整功因控制單元之電容值，來調節開關式電源之功率開關(切換元件SW)切換導通時間，使得調光器在進行亮度調整時，不受功因控制單元固定電容值之限制，而可有擴大整體調光範圍。此外，本發明更可在亮度被調整至一最低值時，截止功因控制單元之電源供應，來中斷提供電源給發光單元，避免閃爍現像發生。In summary, the present invention adjusts the switching time of the power switch (switching element SW) of the switching power supply by dynamically adjusting the capacitance value of the power factor control unit, so that the dimmer is not affected by the brightness adjustment. Due to the limitation of the fixed capacitance value of the control unit, the overall dimming range can be expanded. In addition, the present invention can interrupt the supply of power to the light-emitting unit when the brightness is adjusted to a minimum value to cut off the power supply of the power control unit to prevent the occurrence of flickering.
雖然本發明已以實施方式揭露如上，然其並非用以限定本發明，任何熟習此技藝者，在不脫離本發明之精神和範圍內，當可作各種之更動與潤飾，因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.
100．．．發光二極體驅動裝置100. . . Light-emitting diode driving device
101．．．調光單元101. . . Dimming unit
102．．．電壓轉換單元102. . . Voltage conversion unit
103．．．發光單元103. . . Light unit
104．．．回授單元104. . . Feedback unit
105．．．功因控制單元105. . . Power factor control unit
1011．．．調光器1011. . . Light modulator
1012．．．電磁干擾濾波器1012. . . Electromagnetic interference filter
1013．．．整流器1013. . . Rectifier
1021．．．返馳式轉換器1021. . . Flyback converter
301．．．比較器301. . . Comparators
SW．．．切換元件SW. . . Switching element
SW1．．．第一切換元件SW1. . . First switching element
SW2．．．第二切換元件SW2. . . Second switching element
C1．．．時序電容C1. . . Timing capacitor
C2．．．擴充時序電容C2. . . Extended timing capacitor
AC．．．交流電源AC. . . AC power
VCC1．．．第一直流驅動電壓VCC1. . . First DC drive voltage
VCC2．．．第二直流驅動電壓VCC2. . . Second DC drive voltage
N1．．．一次側繞組N1. . . Primary winding
N2．．．二次側繞組N2. . . Secondary winding
Do．．．二極體Do. . . Dipole
Co．．．輸出電容Co. . . Output capacitor
501~507．．．步驟501~507. . . step
601~603．．．步驟601~603. . . step
為讓本發明之上述和其他目的、特徵、優點與實施例能更明顯易懂，所附圖式之說明如下：The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood.
第1圖所示為根據本發明一實施例之可動態調整調光範圍之驅動裝置概略圖。Fig. 1 is a schematic view showing a driving device capable of dynamically adjusting a dimming range according to an embodiment of the present invention.
第2圖所示為根據本發明一實施例之可動態調整調光範圍之驅動裝置電路圖。2 is a circuit diagram of a driving device capable of dynamically adjusting a dimming range according to an embodiment of the present invention.
第3圖所示為根據本發明一實施例可擴大調光範圍之電路結構。Fig. 3 is a diagram showing the circuit structure which can expand the dimming range according to an embodiment of the present invention.
第4圖所示為根據本發明另一實施例可擴大調光範圍之電路結構。Fig. 4 is a view showing a circuit structure which can expand the dimming range according to another embodiment of the present invention.
第5圖所示為根據本發明一實施例動態調整調光範圍之流程圖。Figure 5 is a flow chart showing the dynamic adjustment of the dimming range in accordance with an embodiment of the present invention.
第6圖所示為根據本發明另一實施例動態調整調光範圍之流程圖。Figure 6 is a flow chart showing the dynamic adjustment of the dimming range in accordance with another embodiment of the present invention.
100．．．發光二極體驅動裝置100. . . Light-emitting diode driving device
101．．．調光單元101. . . Dimming unit
102．．．電壓轉換單元102. . . Voltage conversion unit
103．．．發光單元103. . . Light unit
104．．．回授單元104. . . Feedback unit
105．．．功因控制單元105. . . Power factor control unit
SW．．．切換元件SW. . . Switching element
SW1．．．第一切換元件SW1. . . First switching element
SW2．．．第二切換元件SW2. . . Second switching element
C1．．．時序電容C1. . . Timing capacitor
C2．．．擴充時序電容C2. . . Extended timing capacitor
AC．．．交流電源AC. . . AC power
VCC1．．．第一直流驅動電壓VCC1. . . First DC drive voltage
VCC2．．．第二直流驅動電壓VCC2. . . Second DC drive voltage
Claims (12)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100138271A TWI458389B (en) | 2011-10-21 | 2011-10-21 | Dynamically adjusting dimming range driving apparatus and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100138271A TWI458389B (en) | 2011-10-21 | 2011-10-21 | Dynamically adjusting dimming range driving apparatus and method thereof |
Publications (2)
| Publication Number | Publication Date |
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| TW201318478A true TW201318478A (en) | 2013-05-01 |
| TWI458389B TWI458389B (en) | 2014-10-21 |
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| TW100138271A TWI458389B (en) | 2011-10-21 | 2011-10-21 | Dynamically adjusting dimming range driving apparatus and method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI465153B (en) * | 2014-02-19 | 2014-12-11 | Chin Hsin Yang | Valley synchronous regulator with pfc led driver system |
| TWI697180B (en) * | 2019-12-20 | 2020-06-21 | 大陸商明緯（廣州）電子有限公司 | Power conversion device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10568173B1 (en) | 2018-12-21 | 2020-02-18 | Chiplight Technology (Shenzhen) Co., Ltd. | Dimmer circuit for use in light-emitting diode lighting system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI384898B (en) * | 2008-06-18 | 2013-02-01 | Delta Electronics Inc | Dimmable led driving circuit |
| TW201044919A (en) * | 2009-06-12 | 2010-12-16 | Phihong Technology Co Ltd | Dimmable LED device with low ripple current and driving circuit thereof |
-
2011
- 2011-10-21 TW TW100138271A patent/TWI458389B/en active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI465153B (en) * | 2014-02-19 | 2014-12-11 | Chin Hsin Yang | Valley synchronous regulator with pfc led driver system |
| TWI697180B (en) * | 2019-12-20 | 2020-06-21 | 大陸商明緯（廣州）電子有限公司 | Power conversion device |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI458389B (en) | 2014-10-21 |
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