201029521 六、發明說明： 【發明所屬之技術領域】 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。 Φ 【先前技術】 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 關切換焭燈盞數’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。 發光二極體（LightEmittingDiode)具有省電、壽命長及高亮 ❹度等優點，近年來在許多照明應用中.日漸普及，如指示號諸燈或手 電筒。請參考第1圖，第！圖為習知一發光二極體之照明裝置1〇 的示意圖。照明裝置1〇係一多段亮度之照明裝置，其包含有一發光 二極體電路1GG、—微控制ϋ 102及-驗寬度調變（PulseWidth Modulation)控制單元1〇4。照明裝置1〇所需的電源由一輸入電源 VCC供應。微控制n丨〇2產生職於—特定亮度之—鋪訊號侧 至脈波寬度調變控制單元1〇4。脈波寬度調變控制單元1〇4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1〇的亮度。 201029521 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1〇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。 ^ 【發明内容】 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。 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 ®兀，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。 ° 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。: 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= 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^含= 201029521 ❿ 接於關!1 ’用來透過該關接收由該交流電源 、、"丨l電源，一電容，輕接於該電源接收端’用'來儲存 量；一控鮮元，_該發光二極體電路，时根據—控制訊號， 調整該發光二極體電路的轉電流，以驅動該發光二極體電路產生 光源，以及-調光單元，雛於該電源接收端、該電容及該控制單 元，用來於該電容之下降未達―第一臨界值時，根據該開關的 關閉情形，產生該控制訊號，以調整該發光二減電路的亮度狀態。 【實施方式】 請參考第2 ®，帛2職本發财酬—翻裝置2〇之示意 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。照明装置2〇包含有一發光二極體電路 200、一開關202、一驅動裝置2〇4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 φ 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2〇〇所 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。 201029521 * 驅動裝置204包含有-電源接收端篇、一電容21()、—調光 單元212及-控制單元216。魏接收端搞接於電源轉換器， 當開關202導通時，電源轉換器將提供驅動裝置2〇4所需之直流電 源。電容210耦接於電源接收端vm，用來儲存電量。調光單元Μ? 耗接於電源接收端VIN及電容210，用來於電容21〇之電壓下降未 達-臨界值VTH1 (即調光單元212可維持運作所需之電麼下限） 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2〇〇，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2〇〇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_。 ❹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¥1111時，根據開關2〇2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鈞電壓準位產生變化，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 201029521 216 ’用來於開關202關閉但電容21〇的電壓尚未低於臨界值VTHl 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 電位轉換至低餘的:欠數，域生對應於適當之亮度祕的控制訊 唬SC舉例來說，在電容21〇的電壓尚未低於臨界值vTm前，開 關202受使用者控制被開關了三次，此時，計數單元222累計債測 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工作於—夜燈模式。 以實作而言，_單元22G可為—電壓制器（職age Detector )’臨界值VTH2即電壓偵測器之參考電壓。當偵測單元22〇 侧到^壓高於臨界值VTH2，偵測單元22G輸出一高電位訊號； 當偵測單元22G偵測到的電壓低於臨界值VTH2，侧單元22〇則 輸出-低電位訊號。此外，偵測單元22G的工作電壓及計數單元222 的工作電壓姐#為不同的電壓，以避免開關啦關閉時電容训 的電壓造成偵測訊號SD誤判的情形。 當開關202關閉時’直流電源不輸出至調光單元212，照明裝 ^ 20不產生光源’此時，電容21〇供應電量至偵測單元22〇及計數 222。在電容210之電壓開始下降但尚未達到臨界值VTm的 讀時間内’開關202每關閉-次，制單元22〇即輸出低電位之 偵測訊號SD至計數單A 222。計數單元η2累計偵測訊號沁由高 電位轉換至低電位的次數，以產生對應於適#之亮度狀態的控制訊 號SC胃開關202再次導通’控制單元216根據控制訊號sc，調 201029521 整發光二極體電路200的工作電流，以驅動發光二極體電路勘產 生適當亮度的光源。請參考第3圖及第4圖，第3圖及第*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犯 之關係圖。躺單元220的電壓偵測點即電容2ι〇的端點；臨界值 ντΗ1為調光單元212可維持運作所需之電壓下限，即計數單元奶 被重置之電壓；臨界值VTH2為偵測單元22()之參考電壓。由第3 圖可知’當偵測單元220戶斤測得的電壓下降至臨界^VTH2但未達 ❹臨界值VTH1時’制單％ 220根據開關202的關閉情形，產生備 測訊號SD。另外，由第4圖可知，若開關2〇2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。 習知發光一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 ❹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21〇，同時偵測電壓。 值得注意的是，電容210所儲存的電量其實有限；此外，電源 201029521 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—步提出—照明裝置5G。請參考第5圖， 第5圖為照明褒置50的示意圖。照明裝置5〇類似於第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2〇4 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_及 計數單元222之間。在此，穩壓器5〇〇用作一單向導通元件，用來 Φ於開關2〇2關閉時’使電容別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输於電源轉換器所產生之 直流電源及電源接收端之間，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 ❹中細單元220的電壓偵測點為電源接收端爾，因此偵測單元22〇 所測得的電壓與電容21〇的電壓不同。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。 在第2圖中，本發明實施例假設計數單元222及控制單元21ό 的工作電壓相同’因此彳貞測單元22()所輸出的電壓除了供應計數單 疋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 2〇，另包含有一穩壓器800及一電壓偵測器802。穩壓器800的功 201029521 用與第5圖之穩；1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22〇及計數單元222的工作 電壓；於開關2〇2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22〇 不再提供工作狀態與電壓至控制單元216。如此一來，於開關2〇2 關閉時，電源接收端VIN的電壓下降，電壓偵測器8〇2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 ❹80巾不須使用單向導通树，即可達到節省電容21〇之電量的目的。 照明裝置5G及朗裝置8G料本發明之實施例，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 電廢偵測器等元件’皆可視需要使用。於上述照明裝置2〇、5〇及 80 t，计數單元222耦接於偵測單元220 ’以接收偵測訊號SD ;偵 測單元220透過電源接收端谓接收電源並個開關2〇2的啟閉。 參於本發明其它實施例中，亦可直接取開關2〇2後端的交流電源，經 過處理後產生偵測訊號。此外，侧單元22()之偵測訊號除了輕接 於電源接收端VIN之外’可另祕於開關2〇2至電源接收端丽 之間的電路中任-合適之位置，以偵測開關2〇2的啟閉。 综上所述，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’實現調光魏。較佳地，本發明實細透過電容儲 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、穩壓器及電塵偵測器等元件，延 201029521 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。 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 所做之均等變化與料，皆制本發明之涵蓋範圍。 【圖式簡單說明】 ❹第1圖為習知一照明裝置之示意圖。 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。 第3圖及第4圖為第2圖中照明裝置之侦測單元所測得㈣壓及债 測訊號的關係圖。 所測得的電壓、電 第6圖及第7圖為第5圖中照明裝置之偵測單元 容的電壓及偵測訊號的關係圖。 【主要元件符號說明】 10、20、50、80 照明裝置 200 發光二極體電路 202 開關 204 驅動裝置 210 電容 212 調光單元 216 控制單元 220 偵測單元 11 201029521 222 計數單元 500'502 > 800 穩壓器 802 電壓偵測器 vcc 交流電源 VIN 電源接收端 SC、Vctrl 控制訊號 SD 偵測訊號 φ Vpwm 脈波寬度調變訊號 12201029521 VI. Description of the Invention: [Technical Field] The present invention relates to a driving device and related lighting device for a light emitting diode circuit, and more particularly to a light dimming function and a power storage through a capacitor The driving device and related lighting device for the operation of the dimming function. Φ [Prior Art] In daily life, people often need to change the brightness of the light depending on the environment. When using conventional lighting devices such as light bulbs or fluorescent lamps, the user usually switches the number of xenon lamps by a multi-stage switch to adjust the appropriate brightness, such as softer light for dining or brighter light when reading. 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 lamps or flashlights. Please refer to Figure 1, the first! The figure shows a schematic diagram of a lighting device 1〇 of a conventional light-emitting diode. The illuminating device 1 is a multi-stage brightness illuminating device comprising a illuminating diode circuit 1GG, a micro control ϋ 102 and a Pulse Width Modulation control unit 〇4. The power required for the lighting unit 1 is supplied by an input power source VCC. The micro-control n丨〇2 is generated from the - specific brightness - the signal side to the pulse width modulation control unit 1〇4. The pulse width modulation control unit 1〇4 generates a pulse width modulation signal Vpwm according to the control signal Vctrl for controlling the current of the light emitting diode circuit 100 to adjust the brightness of the illumination device 1〇. 201029521 It is known from the above that the brightness adjustment of the illumination device 10 is controlled by the microcontroller 102. When using a conventional lighting device such as a fluorescent lamp, the user switches the light brightness through the switch. In contrast, the lighting device of the light-emitting diode is easier to switch brightness than the fluorescent lamp, and the cost of the microcontroller 102 is relatively high. . Therefore, the light-emitting diode cannot completely replace the traditional light bulb or fluorescent lamp. SUMMARY OF THE INVENTION 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. 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 sheet® coupled to the power receiving end and the capacitor for the capacitor When the voltage drop does not reach a first threshold, a control signal is generated to adjust the brightness state of the LED circuit according to the off condition of the switch. 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 the output of the AC power source, wherein the AC power source is used to provide the power required for the operation of the lighting device. The drive device includes = 201029521 ❿ connected to the off! 1 'is used to receive the AC power supply, the "丨l power supply, a capacitor, and lightly connected to the power receiving end 'use' to store the amount; Controlling the fresh element, the light-emitting diode circuit, according to the control signal, adjusting the rotating current of the light-emitting diode circuit to drive the light-emitting diode circuit to generate a light source, and a dimming unit The receiving end, the capacitor and the control unit are configured to generate the control signal according to the closing condition of the switch when the falling of the capacitor does not reach the “first threshold” to adjust the brightness state of the illuminating circuit. [Embodiment] Please refer to the 2nd, 2nd, 2nd, and 2nd. 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 2 includes a light-emitting diode circuit 200, a switch 202, a driving device 2〇4, and a power converter. The circuit and operation principle of the power converter are known in the art, and are in the present invention and the drawings. The description is omitted. The AC φ power supply 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 2 . The light emitting diode circuit 200 is composed of a plurality of light emitting diodes connected in series and 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. 201029521 * The driving device 204 includes a power receiving end, a capacitor 21 (), a dimming unit 212, and a control unit 216. The Wei receiver is connected to the power converter. When the switch 202 is turned on, the power converter will supply the DC power required by the driver 2〇4. The capacitor 210 is coupled to the power receiving end vm for storing power. The dimming unit 耗 is consumed by the power receiving terminal VIN and the capacitor 210, and is used to reduce the voltage of the capacitor 21〇 to a threshold value VTH1 (ie, the lower limit of the power required for the dimming unit 212 to maintain operation), according to In the closed condition of the switch 202, 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 2 〇〇 for adjusting the operating current of the LED circuit 200 or adjusting the number of lighting of the LED according to the control signal SC ' The light-emitting diode circuit 2 is driven to generate light sources of different brightness states, such as full brightness, semi-brightness, and lightness. The control unit 216 can be designed to adjust the operating current of the LED circuit 200 or to adjust the amount of illumination of the LED, the implementation of which is not limited to the scope of the invention. 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. The user can control the dimming unit 212 to implement a multi-segment 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 2〇2 when the voltage drop of the capacitor 210 does not reach the threshold value of ¥1111. 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 detecting signal SD 钧 voltage level 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 201029521 216' for maintaining the switch 202 closed but the voltage of the capacitor 21〇 is not lower than the threshold value VTH1. The detection signal SD is switched from a high potential to a low: a negative number, and the domain corresponds to a suitable brightness control SC. For example, before the voltage of the capacitor 21〇 has not fallen below the threshold vTm, the switch 202 is subjected to The user control is switched three times. At this time, the counting unit 222 accumulates the debt signal SD from high potential to low potential for three times. The control signal SC generated by the counting unit 222 controls the LED circuit to operate in the night light mode. . In practice, the _ unit 22G can be a voltage regulator (the threshold Detector) threshold value VTH2, that is, the reference voltage of the voltage detector. When the detecting unit 22 detects that the voltage is higher than the threshold VTH2, the detecting unit 22G outputs a high potential signal; when the detected voltage of the detecting unit 22G is lower than the threshold value VTH2, the side unit 22 outputs an output low. Potential signal. In addition, the operating voltage of the detecting unit 22G and the operating voltage of the counting unit 222 are different voltages to prevent the detection signal SD from being misjudged by the voltage of the capacitor training when the switch is turned off. When the switch 202 is turned off, the DC power is not output to the dimming unit 212, and the illumination device 20 does not generate the light source. At this time, the capacitor 21 is supplied with power to the detecting unit 22 and the count 222. When the voltage of the capacitor 210 starts to drop but has not reached the threshold VTm, the switch unit 202 outputs a low potential detection signal SD to the count sheet A 222 every time the switch 202 is turned off. The counting unit η2 accumulates the number of times the detection signal 沁 is switched from the high potential to the low potential to generate the control signal SC corresponding to the brightness state of the SC. The stomach switch 202 is turned on again. The control unit 216 adjusts the illumination signal according to the control signal sc. The operating current of the polar body circuit 200 is used to drive the light emitting diode circuit to produce a light source of appropriate brightness. Please refer to Figures 3 and 4, which show the relationship between the voltage measured by the detection unit 220 and the detection signal in different situations in different situations. The voltage detection point of the lying unit 220 is the end point of the capacitor 2ι〇; the threshold value ντΗ1 is the lower voltage limit required for the dimming unit 212 to maintain operation, that is, the voltage at which the counting unit milk is reset; the threshold value VTH2 is the detecting unit. 22 () reference voltage. It can be seen from Fig. 3 that when the voltage measured by the detecting unit 220 drops to the critical value ^VTH2 but does not reach the threshold value VTH1, the manufacturing unit % 220 generates the standby signal SD according to the closing condition of the switch 202. In addition, as can be seen from Fig. 4, if the switch 2〇2 is not turned on after a period of time after the turn-off, 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 predetermined value. The illumination device of the conventional light-emitting body 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, which greatly reduces 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 charge 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 21 Hey, detect the voltage at the same time. 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 supply 201029521 converter may exceed the operating voltage range of the dimming unit 212. Therefore, the present invention further proposes a lighting device 5G. Please refer to FIG. 5, which is a schematic diagram of the illumination device 50. The illumination device 5 is similar to the illumination device 20 of Fig. 2, and includes voltage regulators 500 and 502 in addition to the LED circuit 200, the switch 202, and the drive device 2〇4. The voltage regulator 500 is coupled between the power receiving terminal VIN and the dimming unit 212, and more precisely, between the power receiving end _ and the counting unit 222. Here, the voltage regulator 5 is used as a one-way conduction component for Φ to enable the power stored in the capacitor to be used more economically when the switch 2〇2 is turned off, so that the counting unit 222 is prevented 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 regulator 502 is coupled between the DC power source and the power receiving terminal generated by the power converter 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 thin unit 220 in the fifth figure is the power receiving end, so the detecting unit 22 The measured voltage is different from the voltage of the capacitor 21〇. The changes of the voltages and signals in Figures 6 and 7 are similar to those in Figures 3 and 4, and will not be described here. In Fig. 2, the embodiment of the present invention assumes that the operating voltages of the counting unit 222 and the control unit 21' are the same'. Therefore, the voltage output by the detecting unit 22() is supplied to the control unit 216 in addition to the supply counting unit 222'. Please refer to Fig. 8, which is a schematic view of a lighting device 80 according to an embodiment of the present invention. The illuminating device 80 is similar to the illuminating device 2 of FIG. 2, and further includes a voltage regulator 800 and a voltage detector 802. The power of the voltage regulator 800 201029521 is the same as that of the steady state of Figure 5; 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 22 and the counting unit 222; when the switch 2〇2 is turned on, the DC power generated by the power converter The operating state and voltage required by the control unit 216 are provided by the voltage detector 802, and the detecting unit 22 does not provide the operating state and voltage to the control unit 216. As a result, when the switch 2〇2 is turned off, the voltage of the power receiving terminal VIN drops, and the voltage detector 8〇2 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 the lighting device ❹80 towel You don't need to use a single-way tree to save 21 watts of capacitance. Illuminating device 5G and lang device 8G are embodiments of the present invention, and those skilled in the art can make various changes and modifications as appropriate. Components such as single-pass components, voltage regulators, and electrical waste detectors can be used as needed. In the lighting devices 2, 5, and 80 t, 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 end and the switch 2 〇 2 Open and close. In other embodiments of the present invention, the AC power supply at the rear end of the switch 2〇2 can also be directly taken, and the detection signal is generated after being processed. In addition, the detection signal of the side unit 22() can be used in the circuit between the switch 2〇2 and the power receiving terminal to detect the switch 2, except that it is lightly connected to the power receiving terminal VIN.启 2 opening and closing. In summary, the embodiment of the present invention implements dimming by using a simple and low-cost circuit such as a detecting unit and a counting unit. Preferably, the present invention stores the amount of 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 dust detector to extend the usage time of the power of the long capacitor of 201029521, thereby preventing the brightness state of the lighting device from being reset prematurely, and improving the use. Convenience. The above are only the preferred embodiments of the present invention, and the equivalent variations and materials of the scope of the present invention are intended to cover the scope of the present invention. [Simple description of the drawing] Fig. 1 is a schematic view of a conventional lighting device. 2, 5, and 8 are schematic views of a lighting device according to an embodiment of the present invention. Fig. 3 and Fig. 4 are diagrams showing the relationship between the (four) pressure and the debt signal measured by the detecting unit of the lighting device in Fig. 2. Measured voltage, electricity Figure 6 and Figure 7 are the relationship between the voltage of the detection unit and the detection signal of the illumination device in Figure 5. [Main component symbol description] 10, 20, 50, 80 Illumination device 200 Light-emitting diode circuit 202 Switch 204 Driving device 210 Capacitor 212 Dimming unit 216 Control unit 220 Detection unit 11 201029521 222 Counting unit 500'502 > 800 Voltage regulator 802 voltage detector vcc AC power supply VIN power receiving end SC, Vctrl control signal SD detection signal φ Vpwm pulse width modulation signal 12