TWI707607B - LED driving circuit and LED lamps using it - Google Patents
LED driving circuit and LED lamps using it Download PDFInfo
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- TWI707607B TWI707607B TW108134940A TW108134940A TWI707607B TW I707607 B TWI707607 B TW I707607B TW 108134940 A TW108134940 A TW 108134940A TW 108134940 A TW108134940 A TW 108134940A TW I707607 B TWI707607 B TW I707607B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
一種LED驅動電路,其特徵在於具有:一第一分壓電路,用以依一輸入電壓提供一第一感測電壓;以及一檢測電路,具有一感測單元及一可禁能之電流源,該感測單元係用以檢測該第一感測電壓低於一第一參考電壓的時間是否超過一閾值以決定一致能信號的狀態,若是,則使該致能信號呈現一作用狀態以致能該可禁能之電流源,若否,則使該致能信號呈現一不作用狀態以禁能該可禁能之電流源,且該可禁能之電流源在被致能時能夠適應性地調整其吸入電流的電流值以使該吸入電流和通過一LED指示燈之一預定電流相等。 An LED driving circuit, characterized by having: a first voltage divider circuit for providing a first sensing voltage according to an input voltage; and a detection circuit having a sensing unit and a disableable current source The sensing unit is used to detect whether the time when the first sensing voltage is lower than a first reference voltage exceeds a threshold to determine the state of the enabling signal, and if so, to make the enabling signal present an active state to enable The disableable current source, if not, makes the enable signal present a non-active state to disable the disableable current source, and the disableable current source can be adaptively enabled when it is enabled The current value of the suction current is adjusted so that the suction current is equal to a predetermined current through an LED indicator.
Description
本發明係有關一種LED驅動電路,尤指一種可和帶有指示燈之開關面板搭配之LED驅動電路。The present invention relates to an LED drive circuit, especially an LED drive circuit that can be matched with a switch panel with indicator lights.
在用以開關照明燈具的現有開關面板中,為了方便使用者在燈關掉之後找到開關面板的位置,有的開關面板會靠表面螢光粉來提供微弱反光,有的則在面板內嵌一個LED小夜燈,面板閉合小夜燈不亮,面板關斷小夜燈亮。In the existing switch panels used to switch lighting fixtures, in order to facilitate the user to find the position of the switch panel after the light is turned off, some switch panels rely on surface phosphor to provide weak reflection, and some are embedded in the panel. LED night light, the panel is closed, the night light is off, and the panel is off, the night light is on.
請參照圖1,其繪示一習知照明燈具之電路圖。如圖1所示,該習知照明燈具包含一開關11、一LED 12、由四個二極體(13a、13b、13c、13d)組成之一全波整流單元13、一濾波電容14、一檢測電路15、一二極體16、一電感17、一驅動器18及一LED模組19,其中,檢測電路15具有由電阻15a和電阻15b組成之一分壓電路以提供一第一控制電壓V
1,由電阻15c和雙極性接面電晶體15d所組成之一第一反相電路以依第一控制電壓V
1產生與其反相之一第二控制電壓V
2,以及由電阻15e和雙極性接面電晶體15f所組成之一第二反相電路以在第二控制電壓V
2為高電位時為LED 12提供一電流路徑;二極體16、電感17和驅動器18則形成一驅動電路以驅動LED模組19。
Please refer to Figure 1, which shows a circuit diagram of a conventional lighting fixture. As shown in Figure 1, the conventional lighting fixture includes a
當開關11閉合時:和開關11並聯的LED 12(小夜燈)不亮;全波整流單元13對交流電壓V
AC進行全波整流以產生一輸入電壓V
IN以供所述的驅動電路點亮LED模組19;且此時第一控制電壓V
1為高電位,第二控制電壓V
2為低電位,雙極性接面電晶體15f為關斷狀態。當開關11關斷時:和開關11並聯的LED 12(小夜燈)點亮;濾波電容14上的輸入電壓V
IN的準位會大幅下降,致使所述的驅動電路無法點亮LED模組19;且此時第一控制電壓V
1為低電位,第二控制電壓V
2為高電位,雙極性接面電晶體15f為閉合狀態以為LED 12提供一電流路徑。
When the
另外,考慮到系統成本和硬體空間的限制,濾波電容14一般不會選取特別大的電容值。然而,由於市電一般會有相當大的電壓變動範圍,例如100V的交流市電會在AC 85V~115V之間變動,因此,當開關11閉合且交流市電處於比較低的電壓時,輸入電壓V
IN的波谷位置會比較低,致使第一控制電壓V
1可能會小於雙極性接面電晶體15d的導通電壓而使雙極性接面電晶體15f導通,從而分走了LED模組19的電流並因而降低了該習知照明燈具的工作效率。另外,雙極性接面電晶體15d和雙極性接面電晶體15f均為高壓元件,無論是以離散元件的方式實現或是集成到晶片內部,都有成本偏高的缺點。
In addition, considering the system cost and hardware space constraints, the
為解決上述問題,本領域亟需一種新穎的LED驅動電路。In order to solve the above problems, a novel LED driving circuit is urgently needed in the art.
本發明之一目的在於提供一種LED驅動電路,其可在不影響一LED模組的驅動效率的情況下為一開關面板的LED指示燈適應性地提供一電流路徑,以在該開關面板之一開關被斷開時點亮該LED指示燈。An object of the present invention is to provide an LED driving circuit, which can adaptively provide a current path for the LED indicator of a switch panel without affecting the driving efficiency of an LED module, so that the This LED indicator will light up when the switch is turned off.
本發明之另一目的在於提供一種LED燈具,其可在不影響其內部之一LED模組的驅動效率的情況下為與其搭配之一開關面板的LED指示燈適應性地提供一電流路徑,以在該開關面板之一開關被斷開時點亮該LED指示燈。Another object of the present invention is to provide an LED lamp, which can adaptively provide a current path for the LED indicator of a switch panel without affecting the driving efficiency of one of its internal LED modules. The LED indicator light is lit when one of the switches of the switch panel is turned off.
為達到前述之目的,一種LED驅動電路乃被提出,其係用以和一開關面板搭配以驅動一LED模組,該開關面板包含一開關及和該開關並聯之一LED指示燈,當該開關閉合時,該LED驅動電路依一輸入電壓產生一輸出電流以驅動該LED模組,當該開關斷開時,該LED驅動電路提供一電流路徑以點亮該LED指示燈,該LED驅動電路的特徵在於具有:In order to achieve the aforementioned purpose, an LED driving circuit is proposed, which is used with a switch panel to drive an LED module. The switch panel includes a switch and an LED indicator parallel to the switch. When the switch When closed, the LED drive circuit generates an output current according to an input voltage to drive the LED module. When the switch is open, the LED drive circuit provides a current path to light up the LED indicator. It is characterized by:
一第一分壓電路,用以依一輸入電壓提供一第一感測電壓;以及A first voltage divider circuit for providing a first sensing voltage according to an input voltage; and
一檢測電路,具有一感測單元及一可禁能之電流源,該感測單元係用以檢測該第一感測電壓低於一第一參考電壓的時間是否超過一閾值以決定一致能信號的狀態,若是,則使該致能信號呈現一作用狀態以致能該可禁能之電流源,若否,則使該致能信號呈現一不作用狀態以禁能該可禁能之電流源,且該可禁能之電流源在被致能時能夠適應性地調整其吸入電流的電流值以使該吸入電流和通過該LED指示燈之一預定電流相等。A detection circuit having a sensing unit and a disableable current source, the sensing unit is used to detect whether the first sensing voltage is lower than a first reference voltage for a time exceeding a threshold to determine an enabling signal If it is, then the enable signal is made to assume an active state to enable the disableable current source, if not, the enable signal is made to assume a non-active state to disable the disableable current source, In addition, when the disabled current source is enabled, the current value of the suction current can be adjusted adaptively to make the suction current equal to a predetermined current through the LED indicator.
在一實施例中,該第一分壓電路係一串聯電阻電路。In one embodiment, the first voltage divider circuit is a series resistance circuit.
在一實施例中,該感測單元具有:In an embodiment, the sensing unit has:
一比較器,用以對該第一感測電壓和該第一參考電壓進行一電壓比較運算以產生一比較結果信號,當該第一感測電壓大於該第一參考電壓時,該比較結果信號呈現一低電位,當該第一感測電壓小於該第一參考電壓時,該比較結果信號呈現一高電位;A comparator for performing a voltage comparison operation on the first sensing voltage and the first reference voltage to generate a comparison result signal. When the first sensing voltage is greater than the first reference voltage, the comparison result signal Presents a low potential, and when the first sensing voltage is less than the first reference voltage, the comparison result signal presents a high potential;
一計時電路,用以在該比較結果信號呈現所述高電位的時間超過該閾值時使一計時輸出信號呈現所述高電位;以及A timing circuit for making a timing output signal present the high potential when the time during which the comparison result signal presents the high potential exceeds the threshold; and
一反及閘,用以對該比較結果信號及該計時輸出信號進行一反及邏輯運算以產生所述的致能信號。An inversion gate is used for performing an inversion logic operation on the comparison result signal and the timing output signal to generate the enabling signal.
在一實施例中,該可禁能之電流源具有:In one embodiment, the disableable current source has:
一JFET電晶體,具有一閘極、一汲極和一源極,該閘極耦接一參考地,該汲極耦接該輸入電壓;A JFET transistor having a gate, a drain and a source, the gate is coupled to a reference ground, and the drain is coupled to the input voltage;
一第二分壓電路,用以依該JFET電晶體的所述源極的電壓產生一第二感測電壓;A second voltage divider circuit for generating a second sensing voltage according to the voltage of the source of the JFET transistor;
一放大器, 具有一致能控制端、一正輸入端、一負輸入端及一輸出端,該致能控制端耦接所述的致能信號,該正輸入端耦接該第二感測電壓,該負輸入端耦接一第二參考電壓;以及An amplifier having a consistent energy control terminal, a positive input terminal, a negative input terminal and an output terminal, the enable control terminal is coupled to the enable signal, and the positive input terminal is coupled to the second sensing voltage, The negative input terminal is coupled to a second reference voltage; and
一NMOS電晶體,具有一閘極以耦接該放大器之所述輸出端,一汲極以耦接該JFET電晶體之所述源極,及一源極以耦接該參考地。An NMOS transistor has a gate for coupling to the output terminal of the amplifier, a drain for coupling to the source of the JFET transistor, and a source for coupling to the reference ground.
在一實施例中,該輸入電壓係一交流電壓經一全波整流單元整流後所產生的電壓。In one embodiment, the input voltage is a voltage generated after an AC voltage is rectified by a full-wave rectifier unit.
為達到前述之目的,本發明進一步提出一種LED燈具,其包括一LED驅動電路及一LED模組,其中,該LED驅動電路係用以和一開關面板搭配以驅動該LED模組,該開關面板包含一開關及和該開關並聯之一LED指示燈,當該開關閉合時,該LED驅動電路依一輸入電壓產生一輸出電流以驅動該LED模組,當該開關斷開時,該LED驅動電路提供一電流路徑以點亮該LED指示燈,該LED驅動電路的特徵在於具有:In order to achieve the foregoing objective, the present invention further provides an LED lamp, which includes an LED driving circuit and an LED module, wherein the LED driving circuit is used with a switch panel to drive the LED module, and the switch panel It includes a switch and an LED indicator in parallel with the switch. When the switch is closed, the LED drive circuit generates an output current according to an input voltage to drive the LED module. When the switch is off, the LED drive circuit A current path is provided to light the LED indicator, and the LED drive circuit is characterized by:
一第一分壓電路,用以依一輸入電壓提供一第一感測電壓;以及A first voltage divider circuit for providing a first sensing voltage according to an input voltage; and
一檢測電路,具有一感測單元及一可禁能之電流源,該感測單元係用以檢測該第一感測電壓低於一第一參考電壓的時間是否超過一閾值以決定一致能信號的狀態,若是,則使該致能信號呈現一作用狀態以致能該可禁能之電流源,若否,則使該致能信號呈現一不作用狀態以禁能該可禁能之電流源,且該可禁能之電流源在被致能時能夠適應性地調整其吸入電流的電流值以使該吸入電流和通過該LED指示燈之一預定電流相等。A detection circuit having a sensing unit and a disableable current source, the sensing unit is used to detect whether the first sensing voltage is lower than a first reference voltage for a time exceeding a threshold to determine an enabling signal If it is, then the enable signal is made to assume an active state to enable the disableable current source, if not, the enable signal is made to assume a non-active state to disable the disableable current source, In addition, when the disabled current source is enabled, the current value of the suction current can be adjusted adaptively to make the suction current equal to a predetermined current through the LED indicator.
在一實施例中,該第一分壓電路係一串聯電阻電路。In one embodiment, the first voltage divider circuit is a series resistance circuit.
在一實施例中,該感測單元具有:In an embodiment, the sensing unit has:
一比較器,用以對該第一感測電壓和該第一參考電壓進行一電壓比較運算以產生一比較結果信號,當該第一感測電壓大於該第一參考電壓時,該比較結果信號呈現一低電位,當該第一感測電壓小於該第一參考電壓時,該比較結果信號呈現一高電位;A comparator for performing a voltage comparison operation on the first sensing voltage and the first reference voltage to generate a comparison result signal. When the first sensing voltage is greater than the first reference voltage, the comparison result signal Presents a low potential, and when the first sensing voltage is less than the first reference voltage, the comparison result signal presents a high potential;
一計時電路,用以在該比較結果信號呈現所述高電位的時間超過該閾值時使一計時輸出信號呈現所述高電位;以及A timing circuit for making a timing output signal present the high potential when the time during which the comparison result signal presents the high potential exceeds the threshold; and
一反及閘,用以對該比較結果信號及該計時輸出信號進行一反及邏輯運算以產生所述的致能信號。An inversion gate is used for performing an inversion logic operation on the comparison result signal and the timing output signal to generate the enabling signal.
在一實施例中,該可禁能之電流源具有:In one embodiment, the disableable current source has:
一JFET電晶體,具有一閘極、一汲極和一源極,該閘極耦接一參考地,該汲極耦接該輸入電壓;A JFET transistor having a gate, a drain and a source, the gate is coupled to a reference ground, and the drain is coupled to the input voltage;
一第二分壓電路,用以依該JFET電晶體的所述源極的電壓產生一第二感測電壓;A second voltage divider circuit for generating a second sensing voltage according to the voltage of the source of the JFET transistor;
一放大器, 具有一致能控制端、一正輸入端、一負輸入端及一輸出端,該致能控制端耦接所述的致能信號,該正輸入端耦接該第二感測電壓,該負輸入端耦接一第二參考電壓;以及An amplifier having a consistent energy control terminal, a positive input terminal, a negative input terminal and an output terminal, the enable control terminal is coupled to the enable signal, and the positive input terminal is coupled to the second sensing voltage, The negative input terminal is coupled to a second reference voltage; and
一NMOS電晶體,具有一閘極以耦接該放大器之所述輸出端,一汲極以耦接該JFET電晶體之所述源極,及一源極以耦接該參考地。An NMOS transistor has a gate for coupling to the output terminal of the amplifier, a drain for coupling to the source of the JFET transistor, and a source for coupling to the reference ground.
在一實施例中,該輸入電壓係一交流電壓經一全波整流單元整流後所產生的電壓。In one embodiment, the input voltage is a voltage generated after an AC voltage is rectified by a full-wave rectifier unit.
請參照圖2,其繪示本發明之照明燈具之一實施例之電路圖。如圖2所示,一LED燈具100係與一開關面板110(包含一開關110a及和開關110a並聯之一LED 110b)耦接,其中,LED燈具100包含一全波整流單元101、一濾波電容102、一分壓電路103(由一第一電阻103a和一第二電阻103b串接而成)、一檢測電路104、一驅動電路105(包含一二極體105a、一電感105b和一驅動器105c)以及一LED模組106,其中,檢測電路104具有一比較器104a、一計時電路104b、一反及閘104c、一第三電阻104d、一第四電阻104e、一放大器104f、一NMOS電晶體104g及一JFET電晶體104h,其中,比較器104a、計時電路104b及反及閘104c組成一感測單元,第三電阻104d、第四電阻104e、放大器104f、NMOS電晶體104g及JFET電晶體104h組成一可禁能之電流源,該感測單元係用以在分壓電路103所提供之一第一感測電壓V
1低於一第一參考電壓V
REF1的時間超過一閾值(例如但不限於10ms)時使其輸出之一致能信號EN呈現一作用狀態(例如但不限於一高電位),且該可禁能之電流源在致能信號EN呈現所述作用狀態時能夠適應性地調整其吸入電流的電流值,以使該吸入電流等於開關面板110上預定通過LED 110b之一驅動電流,以穩定點亮LED 110b。
Please refer to FIG. 2, which shows a circuit diagram of an embodiment of the lighting fixture of the present invention. As shown in FIG. 2, an
當開關110a閉合時:和開關110a並聯的LED 110b (小夜燈)不亮;全波整流單元101對交流電壓V
AC進行全波整流以產生一輸入電壓V
IN以供驅動電路105點亮LED模組106;在此情況下,第一感測電壓V
1低於第一參考電壓V
REF1的時間不會超過該閾值,致能信號EN會呈現一不作用狀態(例如但不限於一低電位),且NMOS電晶體104g呈現關斷狀態。
When the
當開關110a關斷時:和開關110a並聯的LED 110b (小夜燈)點亮;濾波電容102上的輸入電壓V
IN的準位會大幅下降,致使驅動電路105無法點亮LED模組106;在此情況下,第一感測電壓V
1低於第一參考電壓V
REF1的時間會超過該閾值,致能信號EN會呈現所述的作用狀態以致能該可禁能之電流源。
When the
具體而言,該感測單元的工作原理說明如下:Specifically, the working principle of the sensing unit is described as follows:
比較器104a係用以對第一感測電壓V
1和第一參考電壓V
REF1進行一電壓比較運算以產生一比較結果信號,當第一感測電壓V
1大於第一參考電壓V
REF1時,該比較結果信號呈現一低電位,當第一感測電壓V
1小於第一參考電壓V
REF1時,該比較結果信號呈現一高電位;
The
計時電路104b係用以在該比較結果信號呈現所述高電位的時間超過該閾值時使一計時輸出信號呈現所述高電位;The
反及閘104c係用以對該比較結果信號及該計時輸出信號進行一反及邏輯運算以產生致能信號EN。The
該可禁能之電流源之工作原理說明如下:The working principle of this disableable current source is explained as follows:
第三電阻104d和第四電阻104e組成一分壓電路以依JFET電晶體104h的源極電壓V
X產生一第二感測電壓V
2;
The
放大器104f 具有一致能控制端、一正輸入端、一負輸入端及一輸出端,該致能控制端耦接致能信號EN,該正輸入端耦接第二感測電壓V
2,該負輸入端耦接第二參考電壓V
REF2,且該輸出端耦接NMOS電晶體104g;
The
NMOS電晶體104g具有一閘極、一汲極和一源極,該閘極耦接放大器104f之所述輸出端,該汲極耦接JFET電晶體104h,且該源極耦接一參考地;The
JFET電晶體104h具有一閘極、一汲極和一源極,該閘極耦接所述的參考地,該汲極耦接輸入電壓V
IN,且該源極耦接NMOS電晶體104g的所述汲極。
The
當致能信號EN呈現所述作用狀態時,放大器104f會被致能,從而致能由放大器104f、NMOS電晶體104g、第三電阻104d和第四電阻104e所形成的一負回授電路以使JFET電晶體104h的吸入電流能夠適應性地調整為LED 110b的額定電流。When the enable signal EN assumes the above-mentioned active state, the
請參考圖3,其繪示圖2之照明燈具之一工作波形圖。如圖3所示,當第一感測電壓V
1低於第一參考電壓V
REF1的時間不超過閾值T
S(10 ms)時,致能信號EN會呈現所述的不作用狀態(低電位)—代表開關110a閉合;當第一感測電壓V
1低於第一參考電壓V
REF1的時間超過閾值T
S(10 ms)時,致能信號EN會呈現所述的作用狀態(高電位)—代表開關110a斷開。
Please refer to Figure 3, which shows a working waveform diagram of one of the lighting fixtures in Figure 2. As shown in FIG. 3, when the first sensing voltage V 1 is lower than the first reference voltage V REF1 for a time that does not exceed the threshold T S (10 ms), the enable signal EN will assume the inactive state (low potential ) - denotes a
另外,由於經全波整流單元101整流後的輸入電壓V
IN屬於高電壓,因此JFET電晶體104h須採用高壓元件。
In addition, since the input voltage V IN rectified by the full-
另外,JFET電晶體104h在功能上相當於一個電阻。由於不同型號的開關面板的小夜燈額定電流並不相同,所以小夜燈的驅動電路不能設置成固定電流。依上述的設計,當致能信號EN信號呈現所述的作用狀態時,如果LED 110b的額定電流大於該可禁能之電流源的吸收電流,則JFET電晶體104h的源極電壓V
X會升高,致使第二感測電壓V
2升高以增加該可禁能之電流源的吸收電流;反之,如果LED 110b的額定電流小於該可禁能之電流源的吸收電流,則JFET電晶體104h的源極電壓V
X會下降,致使第二感測電壓V
2下降以減少該可禁能之電流源的吸收電流,最終達到一個動態平衡。
In addition, the
另外,JFET電晶體104h亦可為檢測電路104提供電源通路以產生內部電源、第一參考電壓V
REF1和第二參考電壓V
REF2。
In addition, the
依上述的說明可知,本發明可提供以下的優點:According to the above description, the present invention can provide the following advantages:
1. LED燈具效率高。1. LED lamps have high efficiency.
本發明的檢測電路即使在整流後的輸入電壓有比較低的波谷,但若該輸入電壓時間低於一參考電壓的時間未超過一閾值(約10mS),會認為開關面板沒有關斷,就不會啟動小夜燈的驅動電路,因而不會流失多餘的功耗。Even though the rectified input voltage of the detection circuit of the present invention has a relatively low trough, if the input voltage time is lower than a reference voltage for a time period that does not exceed a threshold value (about 10mS), it will be considered that the switch panel is not turned off, so The drive circuit of the night light will be activated, so excess power consumption will not be lost.
2.便於集成到晶片內部,系統成本低。2. It is easy to integrate into the chip, and the system cost is low.
本發明的檢測電路只使用了一個便於集成到驅動器晶片內部的高壓元件JFET電晶體104h,既節省了硬體空間,又降低系統的應用成本。另外,JFET電晶體104h也可以作為驅動器晶片的啟動電阻,因此無需用到額外的啟動電阻,簡化了系統設計。The detection circuit of the present invention only uses a high-voltage
本發明所揭示者,乃較佳實施例之一種,舉凡局部之變更或修飾而源於本發明之技術思想而為熟習該項技藝知人所易於推知者,俱不脫本發明之專利權範疇。The disclosure of the present invention is one of the preferred embodiments, and any partial changes or modifications that are derived from the technical ideas of the present invention and are easily inferred by those skilled in the art will not depart from the scope of the patent right of the present invention.
綜上所陳,本案無論目的、手段與功效,皆顯示其迥異於習知技術,且其首先發明合於實用,確實符合發明之專利要件,懇請 貴審查委員明察,並早日賜予專利俾嘉惠社會,是為至禱。In summary, regardless of the purpose, means and effect of this case, it is shown that it is very different from the conventional technology, and its first invention is suitable for practicality, and it does meet the patent requirements of the invention. I implore the examiner to investigate and grant the patent as soon as possible Society is for the best prayer.
11:開關
12:LED
13:全波整流單元
13a、13b、13c、13d:二極體
14:濾波電容
15:檢測電路
15a、15b、15c、15e:電阻
15d、15f:雙極性接面電晶體
16:二極體
17:電感
18:驅動器
19:LED模組
100:LED燈具
101:全波整流單元
102:濾波電容
103:分壓電路
103a:第一電阻
103b:第二電阻
104:檢測電路
104a:比較器
104b:計時電路
104c:反及閘
104d:第三電阻
104e:第四電阻
104f:放大器
104g:NMOS電晶體
104h:JFET電晶體
105:驅動電路
105a:二極體
105b:電感
105c:驅動器
106:LED模組
110:開關面板
110a:開關
110b:LED
11: switch
12: LED
13: Full-
圖1繪示一習知照明燈具之電路圖。 圖2繪示本發明之照明燈具之一實施例之電路圖。 圖3繪示圖2之照明燈具之一工作波形圖。 Figure 1 shows a circuit diagram of a conventional lighting fixture. Fig. 2 is a circuit diagram of an embodiment of the lighting fixture of the present invention. Fig. 3 shows a working waveform diagram of the lighting fixture of Fig. 2;
100:LED燈具 100: LED lamps
101:全波整流單元 101: Full-wave rectifier unit
102:濾波電容 102: filter capacitor
103:分壓電路 103: Voltage divider circuit
103a:第一電阻 103a: first resistor
103b:第二電阻 103b: second resistor
104:檢測電路 104: detection circuit
104a:比較器 104a: Comparator
104b:計時電路 104b: Timing circuit
104c:反及閘 104c: reverse and gate
104d:第三電阻 104d: third resistor
104e:第四電阻 104e: fourth resistor
104f:放大器 104f: amplifier
104g:NMOS電晶體 104g: NMOS transistor
104h:JFET電晶體 104h: JFET transistor
105:驅動電路 105: drive circuit
105a:二極體 105a: Diode
105b:電感 105b: Inductance
105c:驅動器 105c: drive
106:LED模組 106: LED module
110:開關面板 110: switch panel
110a:開關 110a: switch
110b:LED 110b: LED
Claims (10)
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TW108134940A TWI707607B (en) | 2019-09-26 | 2019-09-26 | LED driving circuit and LED lamps using it |
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TW108134940A TWI707607B (en) | 2019-09-26 | 2019-09-26 | LED driving circuit and LED lamps using it |
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TW202114468A TW202114468A (en) | 2021-04-01 |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW454941U (en) * | 2000-01-14 | 2001-09-11 | World Search Co Ltd | Switch box with night lamp and power failure alarm |
US20120155069A1 (en) * | 2010-12-16 | 2012-06-21 | Chen Yarn Chen | Multi-purpose illumination device |
CN202873125U (en) * | 2012-08-24 | 2013-04-10 | 林梅冬 | Driver integrating light modulation of touch switch with LED illumination |
CN103270609A (en) * | 2010-12-27 | 2013-08-28 | 松下电器产业株式会社 | Light-emitting diode drive circuit and led light source |
-
2019
- 2019-09-26 TW TW108134940A patent/TWI707607B/en active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW454941U (en) * | 2000-01-14 | 2001-09-11 | World Search Co Ltd | Switch box with night lamp and power failure alarm |
US20120155069A1 (en) * | 2010-12-16 | 2012-06-21 | Chen Yarn Chen | Multi-purpose illumination device |
CN103270609A (en) * | 2010-12-27 | 2013-08-28 | 松下电器产业株式会社 | Light-emitting diode drive circuit and led light source |
CN202873125U (en) * | 2012-08-24 | 2013-04-10 | 林梅冬 | Driver integrating light modulation of touch switch with LED illumination |
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