TWI399129B - Driving device for a light emitting diode circuit and related lighting device - Google Patents

用於一發光二極體電路之驅動裝置及相關照明裝置Driving device and related lighting device for a light emitting diode circuit

本發明係指一種用於一發光二極體電路的驅動裝置及相關照明裝置，尤指一種具有調光功能，並透過一電容儲存電量以供應調光功能運作之驅動裝置及相關照明裝置。The present invention relates to a driving device and related lighting device for a light-emitting diode circuit, and more particularly to a driving device and related lighting device having a dimming function and storing a power through a capacitor to supply a dimming function.

在日常生活中，人們往往需要依環境的不同，改變燈光的亮度。在使用傳統的照明裝置如燈泡或日光燈時，使用者通常透過多段開關切換亮燈盞數，以調整出合適的亮度，如用餐時使用較柔和的光線，或閱讀時使用較明亮的光線等。In daily life, people often need to change the brightness of the light depending on the environment. When using traditional lighting devices such as light bulbs or fluorescent lamps, the user usually switches the number of lighting lights through a multi-segment switch to adjust the appropriate brightness, such as softer light for dining or brighter light when reading.

發光二極體(Light Emitting Diode)具有省電、壽命長及高亮度等優點，近年來在許多照明應用中日漸普及，如指示號誌燈或手電筒。請參考第1圖，第1圖為習知一發光二極體之照明裝置10的示意圖。照明裝置10係一多段亮度之照明裝置，其包含有一發光二極體電路100、一微控制器102及一脈波寬度調變(Pulse Width Modulation)控制單元104。照明裝置10所需的電源由一輸入電源VCC供應。微控制器102產生對應於一特定亮度之一控制訊號Vctrl至脈波寬度調變控制單元104。脈波寬度調變控制單元104根據控制訊號Vctrl產生一脈波寬度調變訊號Vpwm，用以控制發光二極體電路100的電流，進而調整照明裝置10的亮度。Light Emitting Diode has the advantages of power saving, long life and high brightness. It has become popular in many lighting applications in recent years, such as indicator lights or flashlights. Please refer to FIG. 1 , which is a schematic diagram of a lighting device 10 of a conventional light-emitting diode. The illumination device 10 is a multi-segment brightness illumination device comprising a light-emitting diode circuit 100, a microcontroller 102 and a Pulse Width Modulation control unit 104. The power required for the lighting device 10 is supplied by an input power source VCC. The microcontroller 102 generates a control signal Vctrl corresponding to a specific brightness to the pulse width modulation control unit 104. The pulse width modulation control unit 104 generates a pulse width modulation signal Vpwm according to the control signal Vctrl for controlling the current of the LED circuit 100, thereby adjusting the brightness of the illumination device 10.

由上可知，照明裝置10的的亮度調整係由微控制器102所控制。在使用傳統照明裝置如日光燈時，使用者透過開關切換光線亮度，相較之下，發光二極體之照明裝置10不若日光燈般易於切換亮度，且微控制器102所需的成本較高。因此，發光二極體無法完全取代傳統燈泡或日光燈。As can be seen from the above, the brightness adjustment of the illumination device 10 is controlled by the microcontroller 102. When a conventional lighting device such as a fluorescent lamp is used, the user switches the brightness of the light through the switch. In contrast, the lighting device 10 of the light-emitting diode is not as easy to switch the brightness as the fluorescent lamp, and the cost required by the microcontroller 102 is high. Therefore, the light-emitting diode cannot completely replace the traditional light bulb or fluorescent lamp.

因此，本發明之主要目的即在於提供一種用於一發光二極體電路之驅動裝置及相關照明裝置。Accordingly, it is a primary object of the present invention to provide a driving device and associated lighting device for a light emitting diode circuit.

本發明揭露一種用於一發光二極體電路之驅動裝置，包含有一電源接收端，耦接於一開關，用來透過該開關接收一直流電源，該直流電源用來提供該發光二極體電路及該驅動裝置運作所需之電源；一電容，耦接於該電源接收端，用來儲存電量；以及一調光單元，耦接於該電源接收端及該電容，用來於該電容之電壓下降未達一第一臨界值時，根據該開關的關閉情形，產生一控制訊號，以調整該發光二極體電路的亮度狀態。The invention discloses a driving device for a light-emitting diode circuit, comprising a power receiving end coupled to a switch for receiving a DC power through the switch, the DC power source for providing the LED circuit And a power source required for the operation of the driving device; a capacitor coupled to the power receiving end for storing power; and a dimming unit coupled to the power receiving end and the capacitor for the voltage of the capacitor When the falling does not reach a first threshold, a control signal is generated according to the closing condition of the switch to adjust the brightness state of the LED circuit.

本發明另揭露一種照明裝置，包含有一發光二極體電路、一開關及一驅動裝置。該發光二極體電路包含有至少一發光二極體。該開關耦接於一交流電源，用來控制該交流電源的輸出情形，其中該交流電源用來提供該照明裝置運作所需之電源。該驅動裝置包含有一電源接收端，耦接於該開關，用來透過該開關接收由該交流電源所轉換的一直流電源；一電容，耦接於該電源接收端，用來儲存電量；一控制單元，耦接該發光二極體電路，用來根據一控制訊號，調整該發光二極體電路的工作電流，以驅動該發光二極體電路產生光源；以及一調光單元，耦接於該電源接收端、該電容及該控制單元，用來於該電容之電壓下降未達一第一臨界值時，根據該開關的關閉情形，產生該控制訊號，以調整該發光二極體電路的亮度狀態。The invention further discloses a lighting device comprising a light emitting diode circuit, a switch and a driving device. The LED circuit includes at least one light emitting diode. The switch is coupled to an AC power source for controlling an output of the AC power source, wherein the AC power source is used to provide power required for operation of the lighting device. The driving device includes a power receiving end coupled to the switch for receiving a DC power converted by the AC power through the switch; a capacitor coupled to the power receiving end for storing power; The unit is coupled to the LED circuit for adjusting an operating current of the LED circuit according to a control signal to drive the LED circuit to generate a light source, and a dimming unit coupled to the LED The power receiving end, the capacitor and the control unit are configured to generate the control signal according to the closed condition of the switch when the voltage drop of the capacitor does not reach a first threshold to adjust the brightness of the LED circuit status.

請參考第2圖，第2圖為本發明實施例一照明裝置20之示意圖。照明裝置20係以發光二極體為光源，且其運作所需的電源係由一交流電源VCC所提供。照明裝置20包含有一發光二極體電路200、一開關202、一驅動裝置204及一電源轉換器，電源轉換器之電路及運作原理為業界所習知，於本發明及圖式中省略敘述。交流電源VCC經由開關202接入電源轉換器，再藉由轉換電路取得驅動裝置204所需之電源，此電源轉換器亦提供發光二極體電路200所需之能量。發光二極體電路200由多個發光二極體串接及並接所組成。開關202耦接於交流電源VCC，用來控制交流電源VCC輸出至照明裝置20的輸出情形。使用者透過開關202的導通及關閉，控制發光二極體電路200產生光源。驅動裝置204用來驅動發光二極體電路200，並調整發光二極體電路200所產生之光源的亮度狀態，詳述如後。Please refer to FIG. 2, which is a schematic diagram of a lighting device 20 according to an embodiment of the present invention. The illumination device 20 is powered by a light-emitting diode, and the power required for its operation is provided by an AC power source VCC. The illumination device 20 includes a light-emitting diode circuit 200, a switch 202, a driving device 204, and a power converter. The circuit and operation principle of the power converter are well known in the art, and are omitted in the present invention and the drawings. The AC power source VCC is connected to the power converter via the switch 202, and the power required by the driving device 204 is obtained by the conversion circuit. The power converter also supplies the energy required for the LED circuit 200. The LED circuit 200 is composed of a plurality of LEDs connected in series and connected in parallel. The switch 202 is coupled to the AC power source VCC for controlling the output of the AC power source VCC to the illumination device 20. The user controls the LED circuit 200 to generate a light source by turning on and off the switch 202. The driving device 204 is used to drive the LED circuit 200 and adjust the brightness state of the light source generated by the LED circuit 200, as described in detail below.

驅動裝置204包含有一電源接收端VIN、一電容210、一調光單元212及一控制單元216。電源接收端VIN耦接於電源轉換器，當開關202導通時，電源轉換器將提供驅動裝置204所需之直流電源。電容210耦接於電源接收端VIN，用來儲存電量。調光單元212耦接於電源接收端VIN及電容210，用來於電容210之電壓下降未達一臨界值VTH1(即調光單元212可維持運作所需之電壓下限)時，根據開關202的關閉情形，產生一控制訊號SC至控制單元216。控制單元216耦接於調光單元212及發光二極體電路200，用來根據控制訊號SC，調整發光二極體電路200的工作電流或調整發光二極體的點亮數量，以驅動發光二極體電路200產生不同亮度狀態之光源，如全亮、半亮及微亮等。控制單元216可設計用來調整發光二極體電路200的工作電流或調整發光二極體的點亮數量，其實現方式不侷限本發明所欲保護的範疇。The driving device 204 includes a power receiving terminal VIN, a capacitor 210, a dimming unit 212, and a control unit 216. The power receiving terminal VIN is coupled to the power converter. When the switch 202 is turned on, the power converter will provide the DC power required by the driving device 204. The capacitor 210 is coupled to the power receiving terminal VIN for storing power. The dimming unit 212 is coupled to the power receiving end VIN and the capacitor 210 for reducing the voltage of the capacitor 210 by a threshold value VTH1 (ie, the lower voltage limit required for the dimming unit 212 to maintain operation). In the off situation, a control signal SC is generated to the control unit 216. The control unit 216 is coupled to the dimming unit 212 and the LED circuit 200 for adjusting the operating current of the LED circuit 200 or adjusting the number of LEDs to drive the LED according to the control signal SC. The polar body circuit 200 produces light sources of different brightness states, such as full bright, semi-bright, and slightly bright. The control unit 216 can be designed to adjust the operating current of the LED circuit 200 or to adjust the amount of lighting of the LED, the implementation of which is not limited to the scope of the invention.

在此請注意，本發明實施例之驅動裝置204係一具有多段調光功能之驅動裝置，使用者可透過開關202的啟閉，控制調光單元212實現多段調光功能。調光單元212包含有一偵測單元220及一計數單元222。偵測單元220耦接於電源接收端VIN及電容210，用來於電容210之電壓下降未達臨界值VTH1時，根據開關202的關閉情形，產生一偵測訊號SD。當開關202關閉，偵測單元220偵測到的電壓隨即下降；在偵測單元220偵測到的電壓下降至一臨界值VTH2時，偵測訊號SD的電壓準位產生變化，如由高電位轉換至低電位。計數單元222耦接於偵測單元220、電容210及控制單元216，用來於開關202關閉但電容210的電壓尚未低於臨界值VTH1時，利用電容210所儲存的電量維持運作，累計偵測訊號SD由高電位轉換至低電位的次數，以產生對應於適當之亮度狀態的控制訊號SC。舉例來說，在電容210的電壓尚未低於臨界值VTH1前，開關202受使用者控制被開關了三次，此時，計數單元222累計偵測訊號SD由高電位轉換至低電位共三次，計數單元222產生的控制訊號SC將控制發光二極體電路200工作於一夜燈模式。It should be noted that the driving device 204 of the embodiment of the present invention is a driving device having a multi-stage dimming function, and the user can control the dimming unit 212 to realize the multi-stage dimming function through the opening and closing of the switch 202. The dimming unit 212 includes a detecting unit 220 and a counting unit 222. The detecting unit 220 is coupled to the power receiving end VIN and the capacitor 210 for generating a detecting signal SD according to the closing condition of the switch 202 when the voltage drop of the capacitor 210 does not reach the threshold value VTH1. When the switch 202 is turned off, the voltage detected by the detecting unit 220 is decreased; when the voltage detected by the detecting unit 220 drops to a threshold value VTH2, the voltage level of the detecting signal SD changes, such as by a high potential. Switch to low potential. The counting unit 222 is coupled to the detecting unit 220, the capacitor 210 and the control unit 216 for maintaining the operation of the power stored in the capacitor 210 when the switch 202 is turned off but the voltage of the capacitor 210 has not fallen below the threshold value VTH1. The number of times the signal SD transitions from a high potential to a low potential to generate a control signal SC corresponding to the appropriate brightness state. For example, before the voltage of the capacitor 210 has not yet fallen below the threshold VTH1, the switch 202 is switched three times by the user. At this time, the counting unit 222 accumulates the detection signal SD from high potential to low potential for three times, counting The control signal SC generated by the unit 222 will control the LED circuit 200 to operate in a night light mode.

以實作而言，偵測單元220可為一電壓偵測器(Voltage Detector)，臨界值VTH2即電壓偵測器之參考電壓。當偵測單元220偵測到的電壓高於臨界值VTH2，偵測單元220輸出一高電位訊號；當偵測單元220偵測到的電壓低於臨界值VTH2，偵測單元220則輸出一低電位訊號。此外，偵測單元220的工作電壓及計數單元222的工作電壓須設計為不同的電壓，以避免開關202關閉時電容210的電壓造成偵測訊號SD誤判的情形。In practice, the detecting unit 220 can be a voltage detector (Voltage Detector), and the threshold value VTH2 is a reference voltage of the voltage detector. When the detected voltage of the detecting unit 220 is higher than the threshold value VTH2, the detecting unit 220 outputs a high potential signal; when the detected voltage of the detecting unit 220 is lower than the threshold value VTH2, the detecting unit 220 outputs a low level. Potential signal. In addition, the operating voltage of the detecting unit 220 and the operating voltage of the counting unit 222 must be designed to be different voltages to prevent the voltage of the capacitor 210 from being misjudged by the detecting signal SD when the switch 202 is turned off.

當開關202關閉時，直流電源不輸出至調光單元212，照明裝置20不產生光源，此時，電容210供應電量至偵測單元220及計數單元222。在電容210之電壓開始下降但尚未達到臨界值VTH1的這段時間內，開關202每關閉一次，偵測單元220即輸出低電位之偵測訊號SD至計數單元222。計數單元222累計偵測訊號SD由高電位轉換至低電位的次數，以產生對應於適當之亮度狀態的控制訊號SC。當開關202再次導通，控制單元216根據控制訊號SC，調整發光二極體電路200的工作電流，以驅動發光二極體電路200產生適當亮度的光源。請參考第3圖及第4圖，第3圖及第4圖顯示不同情形下，第2圖中偵測單元220所測得的電壓及偵測訊號SD之關係圖。偵測單元220的電壓偵測點即電容210的端點；臨界值VTH1為調光單元212可維持運作所需之電壓下限，即計數單元222被重置之電壓；臨界值VTH2為偵測單元220之參考電壓。由第3圖可知，當偵測單元220所測得的電壓下降至臨界值VTH2但未達臨界值VTH1時，偵測單元220根據開關202的關閉情形，產生偵測訊號SD。另外，由第4圖可知，若開關202於關閉後超過一段時間沒有導通，電容210的電壓下降至臨界值VTH1以下，則計數單元222被重置，亮度狀態回復至一預設值。When the switch 202 is turned off, the DC power source is not output to the dimming unit 212, and the illumination device 20 does not generate a light source. At this time, the capacitor 210 supplies power to the detecting unit 220 and the counting unit 222. During the period when the voltage of the capacitor 210 begins to decrease but has not reached the threshold value VTH1, the detection unit 220 outputs a low potential detection signal SD to the counting unit 222 every time the switch 202 is turned off. The counting unit 222 accumulates the number of times the detection signal SD is switched from the high potential to the low potential to generate the control signal SC corresponding to the appropriate brightness state. When the switch 202 is turned on again, the control unit 216 adjusts the operating current of the LED circuit 200 according to the control signal SC to drive the LED circuit 200 to generate a light source of appropriate brightness. Please refer to FIG. 3 and FIG. 4 . FIG. 3 and FIG. 4 show the relationship between the voltage measured by the detecting unit 220 and the detection signal SD in different situations in different situations. The voltage detection point of the detecting unit 220 is the end point of the capacitor 210; the threshold value VTH1 is the lower voltage limit required for the dimming unit 212 to maintain the operation, that is, the voltage at which the counting unit 222 is reset; the threshold value VTH2 is the detecting unit. 220 reference voltage. As can be seen from FIG. 3, when the voltage measured by the detecting unit 220 drops to the threshold value VTH2 but does not reach the threshold value VTH1, the detecting unit 220 generates the detecting signal SD according to the closing condition of the switch 202. In addition, as can be seen from FIG. 4, if the switch 202 is not turned on after being turned off for a period of time, and the voltage of the capacitor 210 falls below the threshold value VTH1, the counting unit 222 is reset, and the brightness state returns to a preset value.

習知發光二極體之照明裝置係透過微控制器，控制照明裝置之多段亮度狀態，但微控制器的成本昂貴。相較之下，本發明實施例透過偵測單元220及計數單元222等簡單及低成本的元件，達成相同之多段切換的效果，大幅節省照明裝置20的成本。同時，於照明裝置20的開關202關閉時，電容210所儲存的電量足以維持計數單元222的運作。以實作而言，驅動裝置204係一LED驅動晶片。為降低晶片體積，電容210通常設於晶片之外；同時，為減少元件成本，偵測單元220的偵測點設計為電容210的端點，因此驅動裝置204只需提供一個腳位連接電容210，同時偵測電壓。The illumination device of the conventional light-emitting diode controls the multi-segment brightness state of the illumination device through the microcontroller, but the cost of the microcontroller is expensive. In contrast, the embodiment of the present invention achieves the same multi-segment switching effect through simple and low-cost components such as the detecting unit 220 and the counting unit 222, thereby greatly reducing the cost of the lighting device 20. At the same time, when the switch 202 of the illumination device 20 is turned off, the amount of power stored by the capacitor 210 is sufficient to maintain the operation of the counting unit 222. In effect, drive 204 is an LED driven wafer. In order to reduce the size of the chip, the capacitor 210 is usually disposed outside the wafer; at the same time, in order to reduce the component cost, the detection point of the detecting unit 220 is designed as the end point of the capacitor 210, so the driving device 204 only needs to provide a pin connection capacitor 210. At the same time, the voltage is detected.

值得注意的是，電容210所儲存的電量其實有限；此外，電源轉換器所產生之直流電源的電壓可能超過調光單元212的工作電壓範圍許多。因此，本發明進一步提出一照明裝置50。請參考第5圖，第5圖為照明裝置50的示意圖。照明裝置50類似於第2圖之照明裝置20，除了包含有發光二極體電路200、開關202及驅動裝置204之外，另包含有穩壓器500及502。穩壓器500耦接於電源接收端VIN及調光單元212之間，更精確地說，耦接於電源接收端VIN及計數單元222之間。在此，穩壓器500用作一單向導通元件，用來於開關202關閉時，使電容210所儲存的電量能夠更節省地被使用，避免計數單元222過快被重置。穩壓器500亦可使用一二極體或電晶體等單向導通元件替換。穩壓器502耦接於電源轉換器所產生之直流電源及電源接收端VIN之間，用來產生合適於調光單元212的工作電壓。請參考第6圖及第7圖，其顯示不同情形下，第5圖中偵測單元220所測得的電壓及偵測訊號SD之關係圖。在此請注意，第2圖中偵測單元220的電壓偵測點即電容210的端點，而第5圖中偵測單元220的電壓偵測點為電源接收端VIN，因此偵測單元220所測得的電壓與電容210的電壓不同。第6圖及第7圖中各電壓即訊號的變化類似於第3圖及第4圖，在此不贅述。It is worth noting that the amount of power stored in the capacitor 210 is actually limited; in addition, the voltage of the DC power source generated by the power converter may exceed the operating voltage range of the dimming unit 212. Accordingly, the present invention further provides a lighting device 50. Please refer to FIG. 5, which is a schematic diagram of the illumination device 50. The illuminating device 50 is similar to the illuminating device 20 of FIG. 2, and includes voltage regulators 500 and 502 in addition to the LED circuit 200, the switch 202, and the driving device 204. The voltage regulator 500 is coupled between the power receiving terminal VIN and the dimming unit 212, and more specifically, between the power receiving terminal VIN and the counting unit 222. Here, the voltage regulator 500 is used as a one-way conducting component for enabling the power stored in the capacitor 210 to be used more economically when the switch 202 is turned off, thereby preventing the counting unit 222 from being reset too quickly. The regulator 500 can also be replaced with a one-way element such as a diode or a transistor. The voltage regulator 502 is coupled between the DC power source generated by the power converter and the power receiving terminal VIN to generate an operating voltage suitable for the dimming unit 212. Please refer to FIG. 6 and FIG. 7 , which show the relationship between the voltage measured by the detecting unit 220 and the detection signal SD in FIG. 5 in different situations. Please note that the voltage detection point of the detecting unit 220 in FIG. 2 is the end point of the capacitor 210, and the voltage detecting point of the detecting unit 220 in FIG. 5 is the power receiving end VIN, so the detecting unit 220 The measured voltage is different from the voltage of the capacitor 210. The changes of the voltages, that is, the signals in FIGS. 6 and 7 are similar to those in FIGS. 3 and 4, and are not described here.

在第2圖中，本發明實施例假設計數單元222及控制單元216的工作電壓相同，因此偵測單元220所輸出的電壓除了供應計數單元222，亦供應控制單元216。請參考第8圖，第8圖為本發明實施例一照明裝置80的示意圖。照明裝置80類似於第2圖之照明裝置20，另包含有一穩壓器800及一電壓偵測器802。穩壓器800的功用與第5圖之穩壓器502相同。在第6圖中，本發明實施例假設電壓偵測器802的工作電壓高於偵測單元220及計數單元222的工作電壓；於開關202導通時，電源轉換器所產生之直流電源透過電壓偵測器802提供控制單元216所需的工作狀態與電壓，偵測單元220不再提供工作狀態與電壓至控制單元216。如此一來，於開關202關閉時，電源接收端VIN的電壓下降，電壓偵測器802率先關閉，此時電容210所儲存的電量僅供應至計數單元222，因此照明裝置80中不須使用單向導通元件，即可達到節省電容210之電量的目的。In the second embodiment, the embodiment of the present invention assumes that the operating voltages of the counting unit 222 and the control unit 216 are the same. Therefore, the voltage output by the detecting unit 220 is supplied to the control unit 216 in addition to the supply counting unit 222. Please refer to FIG. 8. FIG. 8 is a schematic diagram of a lighting device 80 according to an embodiment of the present invention. The illuminating device 80 is similar to the illuminating device 20 of FIG. 2, and further includes a voltage regulator 800 and a voltage detector 802. The function of the voltage regulator 800 is the same as that of the voltage regulator 502 of FIG. In FIG. 6, the embodiment of the present invention assumes that the operating voltage of the voltage detector 802 is higher than the operating voltage of the detecting unit 220 and the counting unit 222; when the switch 202 is turned on, the DC power generated by the power converter transmits voltage detection. The detector 802 provides the operating state and voltage required by the control unit 216, and the detecting unit 220 no longer provides the operating state and voltage to the control unit 216. As a result, when the switch 202 is turned off, the voltage of the power receiving terminal VIN drops, and the voltage detector 802 is turned off first. At this time, the amount of power stored in the capacitor 210 is only supplied to the counting unit 222, so that the lighting device 80 does not need to use a single By guiding the components, the purpose of saving the power of the capacitor 210 can be achieved.

照明裝置50及照明裝置80皆為本發明之實施例，本領域具通常知識者當可據以作不同的變化及修飾。單向導通元件、穩壓器及電壓偵測器等元件，皆可視需要使用。於上述照明裝置20、50及80中，計數單元222耦接於偵測單元220，以接收偵測訊號SD；偵測單元220透過電源接收端VIN接收電源並偵測開關202的啟閉。於本發明其它實施例中，亦可直接取開關202後端的交流電源，經過處理後產生偵測訊號。此外，偵測單元220之偵測訊號除了耦接於電源接收端VIN之外，可另耦接於開關202至電源接收端VIN之間的電路中任一合適之位置，以偵測開關202的啟閉。Both the illuminating device 50 and the illuminating device 80 are embodiments of the present invention, and those skilled in the art can make various changes and modifications. Components such as single-pass components, voltage regulators, and voltage detectors can be used as needed. In the illuminating devices 20, 50 and 80, the counting unit 222 is coupled to the detecting unit 220 to receive the detecting signal SD. The detecting unit 220 receives the power through the power receiving terminal VIN and detects the opening and closing of the switch 202. In other embodiments of the present invention, the AC power supply at the back end of the switch 202 can also be directly taken, and the detection signal is generated after being processed. In addition, the detection signal of the detecting unit 220 is coupled to the power receiving terminal VIN, and can be coupled to any suitable position in the circuit between the switch 202 and the power receiving terminal VIN to detect the switch 202. Open and close.

綜上所述，本發明實施例係利用偵測單元及計數單元等簡單及低成本的電路，實現調光功能。較佳地，本發明實施例透過電容儲存電量，以於照明裝置的開關關閉時，維持計數單元的運作。此外，本發明實施例應用單向導通元件、穩壓器及電壓偵測器等元件，延長電容之電量的使用時間，進而避免照明裝置的亮度狀態過早被重置，提升使用的便利性。In summary, the embodiment of the present invention implements a dimming function by using a simple and low-cost circuit such as a detecting unit and a counting unit. Preferably, the embodiment of the present invention stores the power through the capacitor to maintain the operation of the counting unit when the switch of the lighting device is turned off. In addition, the embodiment of the present invention applies components such as a single-pass component, a voltage regulator, and a voltage detector to extend the use time of the power of the capacitor, thereby preventing the brightness state of the illumination device from being reset prematurely, thereby improving the convenience of use.

以上所述僅為本發明之較佳實施例，凡依本發明申請專利範圍所做之均等變化與修飾，皆應屬本發明之涵蓋範圍。The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

10、20、50、80．．．照明裝置10, 20, 50, 80. . . Lighting device

200．．．發光二極體電路200. . . Light-emitting diode circuit

202．．．開關202. . . switch

204．．．驅動裝置204. . . Drive unit

210．．．電容210. . . capacitance

212．．．調光單元212. . . Dimming unit

216．．．控制單元216. . . control unit

220．．．偵測單元220. . . Detection unit

222．．．計數單元222. . . Counting unit

500、502、800．．．穩壓器500, 502, 800. . . Stabilizer

802．．．電壓偵測器802. . . Voltage detector

VCC．．．交流電源VCC. . . AC power

VIN．．．電源接收端VIN. . . Power receiving end

SC、Vctrl．．．控制訊號SC, Vctrl. . . Control signal

SD．．．偵測訊號SD. . . Detection signal

Vpwm．．．脈波寬度調變訊號Vpwm. . . Pulse width modulation signal

第1圖為習知一照明裝置之示意圖。Figure 1 is a schematic view of a conventional lighting device.

第2圖、第5圖及第8圖為本發明實施例照明裝置之示意圖。2, 5, and 8 are schematic views of a lighting device according to an embodiment of the present invention.

第3圖及第4圖為第2圖中照明裝置之偵測單元所測得的電壓及偵測訊號的關係圖。Figure 3 and Figure 4 are diagrams showing the relationship between the voltage measured by the detection unit of the illumination device and the detection signal in Figure 2.

第6圖及第7圖為第5圖中照明裝置之偵測單元所測得的電壓、電容的電壓及偵測訊號的關係圖。Fig. 6 and Fig. 7 are diagrams showing the relationship between the voltage, the voltage of the capacitor and the detection signal measured by the detecting unit of the lighting device in Fig. 5.

20．．．照明裝置20. . . Lighting device

200．．．發光二極體電路200. . . Light-emitting diode circuit

202．．．開關202. . . switch

204．．．驅動裝置204. . . Drive unit

210．．．電容210. . . capacitance

212．．．調光單元212. . . Dimming unit

216．．．控制單元216. . . control unit

220．．．偵測單元220. . . Detection unit

222．．．計數單元222. . . Counting unit

VCC．．．交流電源VCC. . . AC power

VIN．．．電源接收端VIN. . . Power receiving end

SC．．．控制訊號SC. . . Control signal

SD．．．偵測訊號SD. . . Detection signal