TW201427250A - Power converter for low power illumination device, control circuit and method thereof - Google Patents
Power converter for low power illumination device, control circuit and method thereof Download PDFInfo
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本發明有關照明系統的電源轉換器,尤指一種相容性更佳的電源轉換器。The invention relates to a power converter for a lighting system, in particular to a power converter with better compatibility.
近年來,由於自然資源的枯竭,人們對於節約能源以及環境保護等議題也越來越重視。因此,許多人會將能源效率較差的照明燈具(例如,白熾燈或鹵素燈等)更換為效率較高的燈具。發光二極體(light emitting diode, LED)的發光效率高、壽命長、體積小、啟動速度快、可靠性高並且不易毀損,因此,越來越多人使用發光二極體等低功率發光裝置取代傳統光源,以作為家庭、辦公室、招牌和路燈等室內外的照明光源。In recent years, due to the depletion of natural resources, people have paid more and more attention to issues such as energy conservation and environmental protection. As a result, many people replace energy-efficient lighting fixtures (such as incandescent or halogen lamps) with more efficient fixtures. Light emitting diodes (LEDs) have high luminous efficiency, long life, small size, fast starting speed, high reliability and are not easily damaged. Therefore, more and more people use low-power light-emitting devices such as light-emitting diodes. It replaces the traditional light source as an indoor and outdoor lighting source for homes, offices, signboards and street lamps.
許多低功率發光裝置會製作成標準的燈泡或燈管等形式,以直接替換傳統的燈泡或燈管。例如,以發光二極體製作成T8規格的燈管、E27接頭的燈泡及MR16規格的燈泡等。然而,現有照明系統的許多電路元件因為安裝於建築物中而難以更換,例如,調光器(dimmer)、電子式變壓器(electric transformer)及安定器(ballast)等。若使用低功率發光裝置直接替換傳統的燈泡或燈管時,常常會與現有的電路元件產生搭配運作上的問題,而使得這些低功率發光裝置產生燈光閃爍或無法點亮等問題。Many low-power illuminators are made into standard light bulbs or tubes to directly replace traditional bulbs or tubes. For example, a light-emitting diode is used to manufacture a T8-sized lamp, an E27-connected bulb, and an MR16-sized bulb. However, many of the circuit components of existing lighting systems are difficult to replace because they are installed in buildings, such as dimmers, electric transformers, ballasts, and the like. If a low-power illuminating device is used to directly replace a conventional light bulb or a lamp tube, it often causes problems in operation with existing circuit components, and these low-power illuminating devices cause problems such as flickering or failure to illuminate.
體積精簡的電子式變壓器常被應用於照明系統中,電子式變壓器由震盪電路等電路元件所組成,而能夠採用較高頻的震盪頻率提供所需的電壓信號。電子式變壓器的負載必須能夠汲取足夠的電流,才能夠使電子式變壓器正常的運作。然而,低功率發光裝置所消耗的能量通常會遠低於燈泡或燈管等傳統的燈具,而無法向電子式變壓器汲取足夠的電流,導致低功率發光裝置常常無法於現有照明系統中正常的運作。A compact electronic transformer is often used in lighting systems. The electronic transformer consists of circuit components such as an oscillating circuit, and can provide a desired voltage signal with a higher frequency oscillation frequency. The load of the electronic transformer must be able to draw enough current to enable the electronic transformer to operate normally. However, the energy consumed by low-power illuminators is usually much lower than traditional luminaires such as bulbs or tubes, and it is not possible to draw enough current into the electronic transformer, resulting in low-power illuminators often failing to function properly in existing lighting systems. .
此外,許多傳統的光源會採用相位截斷式調光器(phase cut dimmer)來調整亮度,相位截斷式調光器通常會採用三端雙向可控矽開關(Triode for Alternating Current, TRIAC)或二極體等元件,以將交電流信號的部分信號截斷,使信號被截斷時的電壓或電流為零或很小的數值,而調整光源的明亮度。當發光二極體等低功率發光裝置搭配調光器及電子式變壓器進行運作時,常常無法達到調光的功能,而會有光線閃爍或無法點亮的問題。In addition, many conventional light sources use a phase cut dimmer to adjust the brightness. Phase-cut dimmers typically use a Triode for Alternating Current (TRIAC) or two poles. A component such as a body that adjusts the brightness of the light source by cutting off part of the signal of the alternating current signal and making the voltage or current when the signal is cut off to zero or a small value. When a low-power light-emitting device such as a light-emitting diode is operated with a dimmer and an electronic transformer, the dimming function is often not achieved, and there is a problem that the light flickers or cannot be lit.
在US2012/016246A1的美國專利公開案中揭示了一種照明裝置和驅動方法,藉由將電源轉換器交替地運作於電流產生模式及斷開模式,以解決上述的相容性問題。然而,即便使用上述公開案的技術搭配調光器和電子式變壓器運作時,仍然會有相容性的問題而無法達成調光的功能。A illuminating device and a driving method are disclosed in the U.S. Patent Publication No. US-A-2012/016,246, the disclosure of which is incorporated herein by reference in its entire entire entire entire entire entire entire entire entire disclosure in However, even when the technology of the above publication is used in conjunction with the dimmer and the electronic transformer, there is still a problem of compatibility and the dimming function cannot be achieved.
有鑑於此,如何減輕或消除上述相關領域中低功率發光裝置的調光問題,實為業界有待解決的問題。In view of this, how to reduce or eliminate the dimming problem of the low-power light-emitting device in the above related field is a problem to be solved in the industry.
本說明書提供一種照明系統的電源轉換器的實施例,用以藉由一整流電路而耦接至一電子式變壓器,該電子式變壓器會依據一調光器所提供的一相位截斷信號而產生一轉換電壓信號,該整流電路會依據該轉換電壓信號而產生一整流電壓信號,該電源轉換器會依據該整流電壓信號而供電至一低功率發光裝置,該電源轉換器包含:一升壓式轉換電路,耦接於該整流電路,依據該整流電壓信號而產生一升壓電壓信號;一降壓式轉換電路,耦接於該升壓式轉換電路,依據該升壓電壓信號而產生一降壓電壓信號,以供電至該低功率發光裝置;以及一控制電路,耦接於該升壓式轉換電路及該降壓式轉換電路,當該整流電壓信號大於一預設電壓信號時,將該升壓式轉換電路設置為運作於一電流導通模式,以向該電子式變壓器汲取電流,並且當該整流電壓信號小於該預設電壓信號時,將該升壓式轉換電路設置為運作於一電流停止模式,以暫停向該電子式變壓器汲取電流;其中該升壓電壓信號的電位會高於該整流電壓信號的電位;該降壓電壓信號的電位會低於該升壓電壓信號的電位;該控制電路會依據該整流信號而產生一運算值,當該運算值為一第一數值時,該控制電路會設置該降壓式轉換電路將該降壓電壓信號調整為一第一電壓值,而當該運算值為一第二數值時,該控制電路會設置該降壓式轉換電路將該降壓電壓信號調整為一第二電壓值。The present specification provides an embodiment of a power converter of a lighting system for coupling to an electronic transformer by a rectifying circuit, and the electronic transformer generates a phase cut signal according to a dimmer. Converting a voltage signal, the rectifier circuit generates a rectified voltage signal according to the converted voltage signal, and the power converter supplies power to a low-power illumination device according to the rectified voltage signal, the power converter includes: a boost conversion a circuit, coupled to the rectifier circuit, generates a boosted voltage signal according to the rectified voltage signal; a buck converter circuit coupled to the boost converter circuit, generating a buck according to the boost voltage signal a voltage signal for supplying power to the low-power light-emitting device; and a control circuit coupled to the boost-type conversion circuit and the buck conversion circuit, when the rectified voltage signal is greater than a predetermined voltage signal, the rise The voltage conversion circuit is configured to operate in a current conduction mode to draw current to the electronic transformer, and when the rectified voltage signal is less than When the voltage signal is preset, the boost converter circuit is configured to operate in a current stop mode to suspend current draw to the electronic transformer; wherein the boost voltage signal has a potential higher than a potential of the rectified voltage signal; The potential of the step-down voltage signal is lower than the potential of the boost voltage signal; the control circuit generates an operation value according to the rectified signal, and when the operation value is a first value, the control circuit sets the drop The voltage conversion circuit adjusts the step-down voltage signal to a first voltage value, and when the operation value is a second value, the control circuit sets the buck conversion circuit to adjust the step-down voltage signal to a The second voltage value.
本說明書另提供一種照明系統的電源轉換器控制電路的實施例;該照明系統包含一調光器、一電子式變壓器、一整流電路、一升壓式轉換電路及一降壓式轉換電路;該調光器會依據一輸入電壓信號而產生一相位截斷信號;該電子式變壓器耦接於該調光器,會依據該相位截斷信號而產生一轉換電壓信號;該整流電路耦接於該電子式變壓器,會依據該轉換電壓信號而產生一整流電壓信號;該升壓式轉換電路耦接於該整流電路,會依據該整流電壓信號而產生一升壓電壓信號;該降壓式轉換電路,耦接於該升壓式轉換電路,會依據該升壓電壓信號而產生一降壓電壓信號,以供電至一低功率發光裝置;該電源轉換器控制電路用以耦接於該升壓式轉換電路及該降壓式轉換電路,並且該電源轉換器控制電路包含:一升壓控制電路,用於設置該升壓式轉換電路的一第一開關的導通狀態;一降壓控制電路,用於設置該降壓式轉換電路的一第二開關的導通狀態;一調光控制電路,耦接於該升壓控制電路及該降壓控制電路,當該整流電壓信號大於一預設電壓信號時,會設置該升壓控制電路間歇性地導通該第一開關,使該升壓式轉換電路運作於一電流導通模式,以向該電子式變壓器汲取電流,並且當該整流電壓信號小於該預設電壓信號時,會設置該升壓控制電路不導通該第一開關,使該升壓式轉換電路運作於一電流停止模式,以暫停向該電子式變壓器汲取電流;其中該升壓電壓信號的電位會高於該整流電壓信號的電位;該降壓電壓信號的電位會低於該升壓電壓信號的電位;該調光控制電路會依據該整流信號而產生一運算值,當該運算值為一第一數值時,該調光控制電路會設置該降壓控制電路設置該第二開關的導通狀態,使該降壓式轉換電路將該降壓電壓信號調整為一第一電壓值,而當該運算值為一第二數值時,該調光控制電路會設置該降壓控制電路設置該第二開關的導通狀態,使該降壓式轉換電路將該降壓電壓信號調整為一第二電壓值。The present specification further provides an embodiment of a power converter control circuit of an illumination system; the illumination system includes a dimmer, an electronic transformer, a rectifier circuit, a boost conversion circuit, and a buck conversion circuit; The dimmer generates a phase cutoff signal according to an input voltage signal; the electronic transformer is coupled to the dimmer, and generates a converted voltage signal according to the phase cutoff signal; the rectifier circuit is coupled to the electronic The transformer generates a rectified voltage signal according to the converted voltage signal; the boosting conversion circuit is coupled to the rectifying circuit, and generates a boosting voltage signal according to the rectified voltage signal; the buck converting circuit is coupled Connected to the boost converter circuit, a step-down voltage signal is generated according to the boost voltage signal to supply power to a low-power light-emitting device; the power converter control circuit is coupled to the boost converter circuit And the buck converter circuit, and the power converter control circuit includes: a boost control circuit for setting one of the boost converter circuits a turn-on state of a switch; a buck control circuit for setting a turn-on state of a second switch of the buck converter circuit; a dimming control circuit coupled to the boost control circuit and the buck control circuit When the rectified voltage signal is greater than a predetermined voltage signal, the boost control circuit is configured to intermittently turn on the first switch to operate the boost converter circuit in a current conduction mode to the electronic transformer. Extracting current, and when the rectified voltage signal is less than the preset voltage signal, setting the boost control circuit to not turn on the first switch, causing the boost converter circuit to operate in a current stop mode to suspend the electronic The transformer draws current; wherein the potential of the boost voltage signal is higher than the potential of the rectified voltage signal; the potential of the buck voltage signal is lower than the potential of the boost voltage signal; the dimming control circuit is based on the rectification The signal generates an operation value. When the operation value is a first value, the dimming control circuit sets the buck control circuit to set the conduction of the second switch. a state, the buck conversion circuit adjusts the step-down voltage signal to a first voltage value, and when the operation value is a second value, the dimming control circuit sets the buck control circuit to set the first The on state of the two switches causes the buck converter circuit to adjust the step-down voltage signal to a second voltage value.
本說明書另提供一種照明系統的電源轉換器控制方法的實施例;該照明系統包含一調光器、一電子式變壓器、一整流電路、一升壓式轉換電路及一降壓式轉換電路;該調光器會依據一輸入電壓信號而產生一相位截斷信號;該電子式變壓器耦接於該調光器,會依據該相位截斷信號而產生一轉換電壓信號;該整流電路耦接於該電子式變壓器,會依據該轉換電壓信號而產生一整流電壓信號;該升壓式轉換電路耦接於該整流電路,會依據該整流電壓信號而產生一升壓電壓信號;該降壓式轉換電路,耦接於該升壓式轉換電路,會依據該升壓電壓信號而產生一降壓電壓信號,以供電至一低功率發光裝置;該電源轉換器控制方法包含:當該整流電壓信號小於一預設電壓信號時,將該升壓式轉換電路的一第一開關設置為不導通,使該升壓式轉換電路運作於一電流停止模式,以暫停向該電子式變壓器汲取電流;當該整流電壓信號大於該預設電壓信號時,間歇性地導通該升壓式轉換電路的該第一開關,使該升壓式轉換電路運作於一電流導通模式,以向該電子式變壓器汲取電流;依據該整流信號而產生一運算值;當該運算值為一第一數值時,設置該降壓式轉換電路的一第二開關的導通狀態,使該降壓式轉換電路將該降壓電壓信號調整為一第一電壓值;以及當該運算值為一第二數值時,設置該降壓式轉換電路的該第二開關的導通狀態,使該降壓式轉換電路將該降壓電壓信號調整為一第二電壓值;其中該升壓電壓信號的電位會高於該整流電壓信號的電位;並且該降壓電壓信號的電位會低於該升壓電壓信號的電位。The present specification further provides an embodiment of a power converter control method for an illumination system; the illumination system includes a dimmer, an electronic transformer, a rectifier circuit, a boost conversion circuit, and a buck conversion circuit; The dimmer generates a phase cutoff signal according to an input voltage signal; the electronic transformer is coupled to the dimmer, and generates a converted voltage signal according to the phase cutoff signal; the rectifier circuit is coupled to the electronic The transformer generates a rectified voltage signal according to the converted voltage signal; the boosting conversion circuit is coupled to the rectifying circuit, and generates a boosting voltage signal according to the rectified voltage signal; the buck converting circuit is coupled Connected to the boost converter circuit, generating a step-down voltage signal according to the boost voltage signal to supply power to a low-power light-emitting device; the power converter control method includes: when the rectified voltage signal is less than a preset a voltage signal, the first switch of the boost converter circuit is set to be non-conducting, so that the boost converter circuit operates at a current stop a mode of suspending current to the electronic transformer; and when the rectified voltage signal is greater than the predetermined voltage signal, intermittently turning on the first switch of the boost converter circuit to operate the boost converter circuit a current conducting mode for drawing current to the electronic transformer; generating an operational value according to the rectified signal; and setting a conducting state of a second switch of the buck converting circuit when the operational value is a first value And the step-down conversion circuit adjusts the step-down voltage signal to a first voltage value; and when the operation value is a second value, setting a conduction state of the second switch of the buck conversion circuit, The buck converter circuit adjusts the buck voltage signal to a second voltage value; wherein the boost voltage signal has a potential higher than a potential of the rectified voltage signal; and the buck voltage signal has a lower potential The potential of the boost voltage signal.
上述實施例的優點之一是能夠使低功率發光裝置與其他電路元件搭配運作時的相容性更好。上述實施例的是另一優點低功率發光裝置與調光器、電子式變壓器等電路元件搭配運作時,能夠提供調光功能,並且避免產生光線閃爍或無法點亮的情形。本發明的其他優點將藉由以下的說明和圖式進行更詳細的解說。One of the advantages of the above embodiments is that the compatibility of the low power lighting device with other circuit components can be made better. Another advantage of the above embodiment is that the low-power light-emitting device can provide a dimming function when it is operated in conjunction with circuit elements such as a dimmer or an electronic transformer, and avoids a situation in which light is flickering or cannot be lit. Other advantages of the invention will be explained in more detail by the following description and drawings.
以下將配合相關圖式來說明本發明的實施例。在圖式中,相同的標號表示相同或類似的元件或流程步驟。Embodiments of the present invention will be described below in conjunction with the associated drawings. In the drawings, the same reference numerals are used to refer to the same or similar elements or process steps.
圖1是本發明的照明系統100的一實施例簡化後的功能方塊圖。圖2是照明系統100運作時的數個信號簡化後的時序圖。照明系統100包含相位截斷式調光器110、電子式變壓器120、整流電路140、電源轉換器160及低功率發光裝置190。為簡潔起見,圖1中照明系統100的其他元件和連接關係被省略以便於說明。1 is a simplified functional block diagram of an embodiment of an illumination system 100 of the present invention. 2 is a simplified timing diagram of several signals when the illumination system 100 is operating. The illumination system 100 includes a phase cutoff dimmer 110, an electronic transformer 120, a rectifier circuit 140, a power converter 160, and a low power illumination device 190. For the sake of brevity, other elements and connections of illumination system 100 in Figure 1 have been omitted for ease of illustration.
相位截斷式調光器110用以接收交流信號Vin,並且可以依據使用者的設置而產生不同程度的相位截斷信號Vtr。例如,使用者可以藉由旋轉旋鈕或移動滑桿等裝置(圖1中未繪示),而調整交流信號Vin被截斷的程度。相位截斷式調光器110可以採用三端雙向可控矽開關(TRIAC)或二極體等元件搭配主動或被動的電路元件的方式實施。例如,圖2中顯示,相位截斷式調光器110依據交流信號Vin所產生的相位截斷信號Vtr。The phase cutoff dimmer 110 is configured to receive the alternating current signal Vin, and may generate different degrees of phase cutoff signals Vtr according to user settings. For example, the user can adjust the degree to which the AC signal Vin is cut off by rotating a knob or moving a slider (not shown in FIG. 1). The phase-cut dimmer 110 can be implemented by using a triac or a diode or the like with active or passive circuit components. For example, as shown in FIG. 2, the phase cutoff dimmer 110 intercepts the signal Vtr according to the phase generated by the alternating signal Vin.
在本實施例中,電子式變壓器120包含有震盪電路(未繪示於圖1),而能夠依據相位截斷信號Vtr而產生轉換電壓信號Vc。例如,輸入電壓信號Vin為110伏特60赫茲的交流電信號可以藉由電子式變壓器110而轉換成較高頻的轉換電壓信號Vc(例如,將轉換電壓信號Vc設置為12伏特40,000赫茲的交流電信號)。如圖2的實施例所示,電子式變壓器120依據相位截斷信號Vtr而產生較高頻的轉換電壓信號Vc。In this embodiment, the electronic transformer 120 includes an oscillating circuit (not shown in FIG. 1), and can generate a converted voltage signal Vc according to the phase cutoff signal Vtr. For example, an alternating current signal whose input voltage signal Vin is 110 volts 60 Hz can be converted into a higher frequency converted voltage signal Vc by the electronic transformer 110 (for example, the converted voltage signal Vc is set to 12 volts, 40,000 Hz alternating current) signal). As shown in the embodiment of FIG. 2, the electronic transformer 120 generates a higher frequency converted voltage signal Vc in accordance with the phase cutoff signal Vtr.
整流電路140耦接於電子式變壓器120和電源轉換器160之間,用以將轉換電壓信號Vc進行整流而產生整流電壓信號Vr,以提供至電源轉換器160。例如,整流電路140可以採用全橋整流電路或半橋整流電路等方式實施。如圖2的實施例所示,整流電路140會依據轉換電壓信號Vc而產生整流電壓信號Vr。The rectifier circuit 140 is coupled between the electronic transformer 120 and the power converter 160 for rectifying the converted voltage signal Vc to generate a rectified voltage signal Vr for being supplied to the power converter 160. For example, the rectifier circuit 140 can be implemented in a full bridge rectifier circuit or a half bridge rectifier circuit. As shown in the embodiment of FIG. 2, the rectifier circuit 140 generates a rectified voltage signal Vr according to the converted voltage signal Vc.
在本實施例中,電源轉換器160包含有升壓式轉換電路162、降壓式轉換電路164及控制電路166。In the present embodiment, the power converter 160 includes a boost converter circuit 162, a buck converter circuit 164, and a control circuit 166.
升壓式轉換電路162會依據整流電壓信號Vr而產生升壓電壓信號Vb,並且升壓電壓信號Vb的電位會高於整流電壓信號Vr的電位。升壓式轉換電路162可以採用各種合適的電路架構實施,以提供電位高於整流電壓信號Vr的升壓電壓信號Vb。The boost converter circuit 162 generates the boost voltage signal Vb according to the rectified voltage signal Vr, and the potential of the boost voltage signal Vb is higher than the potential of the rectified voltage signal Vr. The boost converter circuit 162 can be implemented using a variety of suitable circuit architectures to provide a boost voltage signal Vb having a higher potential than the rectified voltage signal Vr.
降壓式轉換電路164會依據升壓電壓信號Vb而產生降壓電壓信號Vout,並且降壓電壓信號Vout的電位會低於升壓電壓信號Vb的電位。降壓式轉換電路164可以採用各種合適的電路架構實施,以提供電位低於升壓電壓信號Vb的降壓電壓信號Vout。The buck converter circuit 164 generates the buck voltage signal Vout according to the boost voltage signal Vb, and the potential of the buck voltage signal Vout is lower than the potential of the boost voltage signal Vb. The buck converter circuit 164 can be implemented using a variety of suitable circuit architectures to provide a buck voltage signal Vout having a lower potential than the boost voltage signal Vb.
控制電路166耦接於升壓式轉換電路162及降壓式轉換電路164,用以設置升壓式轉換電路162及降壓式轉換電路164的運作,使照明系統100能夠提供所需的照明功能。The control circuit 166 is coupled to the boost converter circuit 162 and the buck converter circuit 164 for setting the operation of the boost converter circuit 162 and the buck converter circuit 164 to enable the illumination system 100 to provide the required illumination function. .
相較於傳統的白熾燈及鹵素燈等發光裝置需要數十瓦特的耗電量,低功率發光裝置190通常僅需要10瓦特左右或者更少的耗電量就能夠達到相當的光線亮度。例如,低功率發光裝置190可以採用一個或多個發光二極體等電路元件實施,或者也可以採用其他合適的低耗電發光裝置實施。Compared to conventional illumination devices such as incandescent lamps and halogen lamps, which require tens of watts of power consumption, the low power illumination device 190 typically requires only about 10 watts or less of power consumption to achieve comparable light levels. For example, the low power illumination device 190 can be implemented using circuit elements such as one or more light emitting diodes, or can be implemented using other suitable low power illumination devices.
在許多照明系統中,電子式變壓器120通常會有最小負載電流值及/或最小負載頻率等產品規格,亦即電子式變壓器120的後級電路所汲取的電流Iet通常必須大於最小負載電流值及/或者後級電路汲取電流Iet的頻率必須大於最小負載頻率,電子式變壓器120才能正常運作而提供所需的轉換電壓信號Vc。In many lighting systems, the electronic transformer 120 typically has a product specification such as a minimum load current value and/or a minimum load frequency, that is, the current Iet drawn by the rear stage circuit of the electronic transformer 120 must generally be greater than the minimum load current value and / or the frequency of the current circuit Iet must be greater than the minimum load frequency, the electronic transformer 120 can operate normally to provide the required conversion voltage signal Vc.
然而,低功率發光裝置190所需的耗電量常常遠低於傳統發光裝置,而無法以傳統方式向電子式變壓器120汲取足夠的電流Iet,而使電子式變壓器120無法正常運作,導致低功率發光裝置190會有閃爍或無法點亮等情形。However, the power consumption required by the low-power illumination device 190 is often much lower than that of the conventional illumination device, and sufficient current Iet cannot be drawn to the electronic transformer 120 in a conventional manner, so that the electronic transformer 120 cannot operate normally, resulting in low power. The light-emitting device 190 may be flickering or unable to light up.
此外,若使用者使用相位截斷式調光器110進行調光時,當相位截斷信號Vtr中信號被截斷時,相位截斷信號Vtr會成為零或很小的數值,而更容易造成電子式變壓器120及低功率發光裝置190運作上的問題,而使低功率發光裝置190產生光線閃爍等現象。In addition, if the user uses the phase cutoff dimmer 110 for dimming, when the signal in the phase cutoff signal Vtr is cut off, the phase cutoff signal Vtr will become zero or a small value, and the electronic transformer 120 is more likely to be caused. And the operation of the low-power light-emitting device 190 causes the low-power light-emitting device 190 to generate a phenomenon such as light flicker.
控制電路166可以設置升壓式轉換電路162以適當的方式向電子式變壓器120汲取電流,使電子式變壓器120能夠正常運作,並設置降壓式轉換器164向低功率發光裝置提供穩定的輸出信號,以解決低功率發光裝置190的相容性問題而能提供所需的照明及調光功能。The control circuit 166 can be configured to provide the boost converter circuit 162 to draw current to the electronic transformer 120 in an appropriate manner to enable the electronic transformer 120 to operate normally, and to provide the buck converter 164 to provide a stable output signal to the low power illumination device. To address the compatibility issues of the low power illumination device 190, the desired illumination and dimming functions can be provided.
圖3是圖1的電源轉換器160的一實施例簡化後的電路圖。以下將以圖1~3進一步說明照明系統100的運作方式。3 is a simplified circuit diagram of an embodiment of the power converter 160 of FIG. 1. The mode of operation of the illumination system 100 will be further described below with reference to Figures 1-3.
在圖3的實施例中,升壓式轉換電路162包含有第一電容310、第一電感311、第一電阻312、第二電阻313、第二電容314、第一開關315、第三電阻316、第一二極體317、第四電阻318以及第五電阻319。開關315可以採用電晶體等方式實施。In the embodiment of FIG. 3 , the boost converter circuit 162 includes a first capacitor 310 , a first inductor 311 , a first resistor 312 , a second resistor 313 , a second capacitor 314 , a first switch 315 , and a third resistor 316 . The first diode 317, the fourth resistor 318, and the fifth resistor 319. The switch 315 can be implemented by means of a transistor or the like.
電容310耦接於整流電路140的輸出端,以接收整流電壓信號Vr。電容310的第一端耦接於電感311的第一端及電阻312的第一端,電感311的第二端耦接於開關315的第一端及二極體317的第一端。電阻312的第二端耦接於電阻313的第一端及電容314的第一端。開關315的第二端耦接於電阻316的第一端,二極體317的第二端耦接於電阻318的第一端,電阻318的第二端耦接於電阻319的第一端。此外,電阻313的第二端、電容314的第二端、電阻316的第二端及電阻319的第二端皆耦接於電容310的第二端。The capacitor 310 is coupled to the output of the rectifier circuit 140 to receive the rectified voltage signal Vr. The first end of the capacitor 310 is coupled to the first end of the inductor 311 and the first end of the resistor 312. The second end of the inductor 311 is coupled to the first end of the switch 315 and the first end of the diode 317. The second end of the resistor 312 is coupled to the first end of the resistor 313 and the first end of the capacitor 314. The second end of the switch 315 is coupled to the first end of the resistor 316, the second end of the diode 317 is coupled to the first end of the resistor 318, and the second end of the resistor 318 is coupled to the first end of the resistor 319. In addition, the second end of the resistor 313, the second end of the capacitor 314, the second end of the resistor 316, and the second end of the resistor 319 are coupled to the second end of the capacitor 310.
控制電路166會藉由第一控制信號SW1而設置開關315的導通狀態,以依據整流電壓信號Vr而產生所需的升壓電壓信號Vb。例如,控制電路166可以依據升壓式轉換電路162的第一感測信號CS等參數,而產生脈寬調變信號(pulse width modulation signal)形式的控制信號SW1,以間歇性的導通開關315,使得電容310的第二端及電感311的第二端之間所累積的電位(即升壓電壓信號Vb的電位)會高於整流電壓信號Vr的電位,並將電容310的第二端及電感311的第二端之間的信號輸出為升壓電壓信號Vb。The control circuit 166 sets the conduction state of the switch 315 by the first control signal SW1 to generate a desired boosted voltage signal Vb according to the rectified voltage signal Vr. For example, the control circuit 166 may generate a control signal SW1 in the form of a pulse width modulation signal according to a parameter such as the first sensing signal CS of the boost converter circuit 162 to intermittently turn on the switch 315. The potential accumulated between the second end of the capacitor 310 and the second end of the inductor 311 (ie, the potential of the boost voltage signal Vb) is higher than the potential of the rectified voltage signal Vr, and the second end of the capacitor 310 and the inductor The signal output between the second ends of 311 is the boost voltage signal Vb.
整流電壓信號Vr經過電阻312和313分壓後會產生調光信號ACTL,控制電路166會依據調光信號ACTL而調整升壓式轉換電路162及/或降壓式轉換電路164的運作方式,使低功率發光裝置190能夠呈現所需的調光效果。The rectified voltage signal Vr is divided by the resistors 312 and 313 to generate a dimming signal ACTL, and the control circuit 166 adjusts the operation mode of the boost converter circuit 162 and/or the buck converter circuit 164 according to the dimming signal ACTL. The low power illumination device 190 is capable of exhibiting the desired dimming effect.
此外,升壓電壓信號Vb經由電阻318以及電阻319的分壓會產生回饋信號FB,而控制電路166也可以藉由回饋信號FB而設置開關315的導通時間、導通頻率和導通狀態等,使升壓式轉換電路162能夠產生所需的升壓電壓信號Vb。In addition, the boosting voltage signal Vb generates a feedback signal FB via the voltage division 318 and the voltage division of the resistor 319, and the control circuit 166 can also set the conduction time, the conduction frequency, and the conduction state of the switch 315 by the feedback signal FB. The voltage conversion circuit 162 is capable of generating a desired boost voltage signal Vb.
在圖3的實施例中,降壓式轉換電路164包含有第三電容331、第六電阻332、第二二極體333、第二開關334、第四電容335以及第二電感336。開關334可以採用電晶體等方式實施。In the embodiment of FIG. 3 , the buck converter circuit 164 includes a third capacitor 331 , a sixth resistor 332 , a second diode 333 , a second switch 334 , a fourth capacitor 335 , and a second inductor 336 . The switch 334 can be implemented by means of a transistor or the like.
電容331的第一端耦接於電阻332的第一端及二極體333的第一端。二極體333的第二端耦接於開關334的第一端,開關334的第二端耦接於電容331的第二端。電阻332的第二端耦接於電容335的第一端,電感336耦接於二極體333的第二端及電容335的第二端之間。The first end of the capacitor 331 is coupled to the first end of the resistor 332 and the first end of the diode 333. The second end of the diode 333 is coupled to the first end of the switch 334, and the second end of the switch 334 is coupled to the second end of the capacitor 331. The second end of the resistor 332 is coupled to the first end of the capacitor 335 , and the inductor 336 is coupled between the second end of the diode 333 and the second end of the capacitor 335 .
控制電路166會藉由第二控制信號SW2而設置開關334的導通狀態,以依據升壓電壓信號Vb而產生所需的降壓電壓信號Vout。例如,在本實施例中,控制電路166可以依據電阻332的兩個端點SEN1及SEN2之間的感測信號Vsen等參數,而產生脈寬調變信號形式的控制信號SW2,以間歇性的導通開關334,使得電容335兩端的電位(即降壓電壓信號Vout的電位)會低於升壓電壓信號Vb的電位,並將電容235兩端的電位的信號輸出為降壓電壓信號Vout,以對低功率發光裝置190供電。The control circuit 166 sets the on state of the switch 334 by the second control signal SW2 to generate the desired step-down voltage signal Vout according to the boosted voltage signal Vb. For example, in this embodiment, the control circuit 166 can generate the control signal SW2 in the form of a pulse width modulation signal according to parameters such as the sensing signal Vsen between the two terminals SEN1 and SEN2 of the resistor 332, in an intermittent manner. The switch 334 is turned on so that the potential across the capacitor 335 (ie, the potential of the step-down voltage signal Vout) is lower than the potential of the boost voltage signal Vb, and the signal of the potential across the capacitor 235 is output as the step-down voltage signal Vout, The low power lighting device 190 is powered.
在較佳的實施例中,降壓電壓信號Vout的電壓會高於低功率發光裝置190的最低負載電壓Vmin(在此定義為使低功率發光裝置190正常發光的最低電壓),以避免低功率發光裝置190發生光線閃爍等現象。例如,當低功率發光裝置190包含3個發光二極體,每個發光二極體的導通電壓皆為3伏特。因此,控制電路166會設置降壓式轉換電路164所提供的降壓電壓信號Vout大於低功率發光裝置190的最低負載電壓9伏特。In a preferred embodiment, the voltage of the step-down voltage signal Vout will be higher than the lowest load voltage Vmin of the low-power illumination device 190 (defined herein as the lowest voltage that causes the low-power illumination device 190 to normally illuminate) to avoid low power. The light-emitting device 190 has a phenomenon such as light flickering. For example, when the low power light emitting device 190 includes three light emitting diodes, each of the light emitting diodes has a turn-on voltage of 3 volts. Therefore, the control circuit 166 sets the buck voltage signal Vout provided by the buck converter circuit 164 to be greater than the lowest load voltage of the low power illuminator 190 by 9 volts.
圖4是電源轉換器160的控制電路166的一實施例簡化後的電路圖,圖5是圖4的調光控制電路430的一實施例簡化後的功能方塊圖,圖6是照明系統100運作時的數個信號簡化後時序圖。以下將以圖1~6進一步說明照明系統100的運作方式。4 is a simplified circuit diagram of an embodiment of the control circuit 166 of the power converter 160, FIG. 5 is a simplified functional block diagram of an embodiment of the dimming control circuit 430 of FIG. 4, and FIG. 6 is a simplified operation of the illumination system 100. Several signals simplifies the timing diagram. The mode of operation of the illumination system 100 will be further described below with reference to Figures 1-6.
在圖4的實施例所顯示的控制電路166包含有升壓控制電路410、調光控制電路430及降壓控制電路450,能夠依據調光信號ACTL而產生對應的控制信號SW1及SW2,使升壓式轉換電路162及降壓式轉換電路164能夠依據所需的方式運作,而使低功率發光裝置190達成調整光線亮度的效果。升壓控制電路410包含第一參考電壓產生電路411、第一比較電路413及第一且閘(AND gate)415,降壓控制電路450包含有第二參考電壓產生電路451及第二比較電路453。The control circuit 166 shown in the embodiment of FIG. 4 includes a boost control circuit 410, a dimming control circuit 430, and a buck control circuit 450. The corresponding control signals SW1 and SW2 can be generated according to the dimming signal ACTL. The voltage conversion circuit 162 and the buck conversion circuit 164 can operate in a desired manner to enable the low power illumination device 190 to achieve the effect of adjusting the brightness of the light. The boost control circuit 410 includes a first reference voltage generating circuit 411, a first comparing circuit 413, and a first AND gate 415. The step-down control circuit 450 includes a second reference voltage generating circuit 451 and a second comparing circuit 453. .
在本實施例的升壓控制電路410中,參考電壓產生電路411用以產生參考電壓信號Vref1,比較電路413會比較升壓式轉換電路162的感測信號CS及參考電壓信號Vref1以產生控制信號SW1,而能設置開關315的導通狀態。例如,比較電路413可以產生脈寬調變信號形式的控制信號SW1,以設置升壓式轉換電路162輸出所需的升壓電壓信號Vb至降壓式轉換電路164。In the boosting control circuit 410 of the present embodiment, the reference voltage generating circuit 411 is configured to generate the reference voltage signal Vref1, and the comparing circuit 413 compares the sensing signal CS of the boosting converting circuit 162 with the reference voltage signal Vref1 to generate a control signal. SW1 can set the conduction state of the switch 315. For example, the comparison circuit 413 can generate the control signal SW1 in the form of a pulse width modulation signal to set the boost converter circuit 162 to output the desired boost voltage signal Vb to the buck converter circuit 164.
且閘415會將控制信號SW1與調光控制電路430所輸出的控制信號EN進行"且"(AND)的運算,以設置開關315的導通狀態,使升壓式轉換電路162能夠以合適的方式向電子式變壓器120汲取電流。當控制信號EN為低電位時,且閘415將控制信號SW1與低電位的控制信號EN進行且的運算後,產生低電位的輸出信號而使開關315呈現不導通的狀態,使升壓式轉換電路162運作於電流停止模式。當控制信號EN為高電位時,且閘415將控制信號SW1與高電位的控制信號EN進行且的運算後,就能夠以控制信號SW1設置開關315的導通狀態,使升壓式轉換電路162運作於電流導通模式。And the gate 415 performs an AND operation on the control signal SW1 and the control signal EN outputted by the dimming control circuit 430 to set the on state of the switch 315, so that the boost converter circuit 162 can be in an appropriate manner. Current is drawn to the electronic transformer 120. When the control signal EN is low, and the gate 415 performs the operation of the control signal SW1 and the low-level control signal EN, a low-potential output signal is generated to cause the switch 315 to be in a non-conducting state, so that the boosting conversion is performed. Circuit 162 operates in a current stop mode. When the control signal EN is at a high potential, and the gate 415 performs the operation of the control signal SW1 and the high-level control signal EN, the conduction state of the switch 315 can be set by the control signal SW1, and the boost converter circuit 162 can be operated. In current conduction mode.
在本實施例的降壓控制電路450中,參考電壓產生電路451用以產生參考電壓信號Vref2,比較電路453會比較降壓式轉換電路164的感測信號Vsen及參考電壓信號Vref2以產生控制信號SW2,而能設置開關334的導通狀態。例如,比較電路453可以產生脈寬調變信號形式的控制信號SW2,以設置降壓式轉換電路164輸出所需的電壓和電流至低功率發光裝置190。In the buck control circuit 450 of the present embodiment, the reference voltage generating circuit 451 is configured to generate the reference voltage signal Vref2, and the comparing circuit 453 compares the sensing signal Vsen of the buck converting circuit 164 with the reference voltage signal Vref2 to generate a control signal. SW2, and the on state of the switch 334 can be set. For example, comparison circuit 453 can generate control signal SW2 in the form of a pulse width modulation signal to set buck conversion circuit 164 to output the desired voltage and current to low power illumination device 190.
在本實施例中,調光控制電路430會接收調光信號ACTL,而能夠產生控制信號EN,並依據調光信號ACTL而設置參考電壓產生電路411及參考電壓產生電路451的至少其中之一,以調整控制信號SW1及/或控制信號SW2,而能夠產生所需的升壓電壓信號Vb及降壓電壓信號Vout,使低功率發光裝置190能夠產生所需的調光效果。In this embodiment, the dimming control circuit 430 receives the dimming signal ACTL, and can generate the control signal EN, and sets at least one of the reference voltage generating circuit 411 and the reference voltage generating circuit 451 according to the dimming signal ACTL. By adjusting the control signal SW1 and/or the control signal SW2, the required boosted voltage signal Vb and the step-down voltage signal Vout can be generated, so that the low-power light-emitting device 190 can generate a desired dimming effect.
例如,在圖5的實施例中,調光控制電路430包含有運算值計算電路510、比較器530和550、第二且閘570和參考電壓調整電路570。For example, in the embodiment of FIG. 5, dimming control circuit 430 includes operational value calculation circuit 510, comparators 530 and 550, second AND gate 570, and reference voltage adjustment circuit 570.
在一實施例中,運算值計算電路510可以包含有電阻、電感、電容、主動元件、及/或被動元件所組成的低通濾波(low pass filtering)電路,將一段時間內所接收的調光信號ACTL進行濾波,以產生調光信號ACTL的濾波值、平均值或加權平均值等運算值。在另一實施例中,運算值計算電路510可以採用放大器所組成的積分電路(integrator circuit)、開關式電容電路(switched capacitor circuit)所組成的積分電路、或者由電阻、電感、電容、主動元件、及/或被動元件所組成的積分電路,以計算一段時間內所接收的調光信號ACTL的累積值或者加權累積值等運算值。In an embodiment, the operation value calculation circuit 510 may include a low pass filtering circuit composed of a resistor, an inductor, a capacitor, an active device, and/or a passive component to receive the dimming for a period of time. The signal ACTL is filtered to generate an operation value such as a filter value, an average value, or a weighted average value of the dimming signal ACTL. In another embodiment, the calculated value calculation circuit 510 may use an integrating circuit composed of an amplifier, an integrating circuit composed of a switched capacitor circuit, or a resistor, an inductor, a capacitor, or an active device. And/or an integrating circuit composed of passive components to calculate an operational value such as a cumulative value of the dimming signal ACTL or a weighted cumulative value received over a period of time.
在本實施例中,比較電路530會將調光信號ACTL的運算值與第一預設電壓信號Vtl進行比較,而比較電路550會將回饋信號FB與第二預設電壓信號Vth進行比較,並且比較電路530和550的輸出信號傳送且閘570以產生控制信號EN。In this embodiment, the comparison circuit 530 compares the operation value of the dimming signal ACTL with the first preset voltage signal Vtl, and the comparison circuit 550 compares the feedback signal FB with the second preset voltage signal Vth, and The output signals of comparison circuits 530 and 550 are transmitted and gate 570 is used to generate control signal EN.
當調光器110所產生的相位截斷信號Vtr被截斷時,整流電路140所對應產生的整流電壓信號Vr會等於零或很小的數值,依據整流電壓信號Vr所產生的調光信號ACTL也會是零或很小的數值,而小於預設電壓信號Vtl。因此,比較電路530會產生低電位的輸出信號,使且閘570產生低電位的控制信號EN。且閘415接收到低電位的控制信號EN後,會產生低電位的輸出信號而將開關315設置為不導通狀態,而使升壓式轉換電路162運作於電流停止模式。When the phase cutoff signal Vtr generated by the dimmer 110 is cut off, the rectified voltage signal Vr generated by the rectifying circuit 140 is equal to zero or a small value, and the dimming signal ACTL generated according to the rectified voltage signal Vr is also Zero or small value, less than the preset voltage signal Vtl. Therefore, the comparison circuit 530 generates a low potential output signal, and the gate 570 generates a low potential control signal EN. When the gate 415 receives the low potential control signal EN, it generates a low potential output signal to set the switch 315 to a non-conducting state, and causes the boost converter circuit 162 to operate in the current stop mode.
當調光器110所產生的相位截斷信號Vtr未被截斷時,依據整流電壓信號Vr所產生的調光信號ACTL會大於預設電壓信號Vtl。因此,比較電路530會產生高電位的輸出信號,當回饋信號FB的信號值小於預設電壓信號Vth時,且閘570會產生高電位的控制信號EN,且閘415接收到高電位的控制信號EN後,會將控制信號SW1輸出至開關315,以間歇性地導通開關315,而使升壓式轉換電路162運作於電流導通模式。When the phase cutoff signal Vtr generated by the dimmer 110 is not cut off, the dimming signal ACTL generated according to the rectified voltage signal Vr may be greater than the preset voltage signal Vtl. Therefore, the comparison circuit 530 generates a high-potential output signal. When the signal value of the feedback signal FB is smaller than the preset voltage signal Vth, the gate 570 generates a high-potential control signal EN, and the gate 415 receives the high-potential control signal. After EN, the control signal SW1 is output to the switch 315 to intermittently turn on the switch 315, and the boost converter circuit 162 operates in the current conduction mode.
在本實施例中,當升壓式轉換電路162於電流導通模式運作一段時間後,升壓電壓信號Vb會持續的上升,而依據升壓電壓信號Vb所產生的回饋信號FB也會持續的上升。當回饋信號FB大於預設電壓信號Vth時,比較電路550會產生低電壓的輸出信號,使且閘570所產生的控制信號EN及且閘415的輸出信號皆為低電位,而將開關315設置為不導通狀態。因此,能夠確保升壓電壓信號Vb能夠保持於預設的電壓範圍內,以避免過高的電壓而造成電路元件的毀損。In this embodiment, when the boost converter circuit 162 operates in the current conducting mode for a period of time, the boost voltage signal Vb continues to rise, and the feedback signal FB generated according to the boost voltage signal Vb continues to rise. . When the feedback signal FB is greater than the preset voltage signal Vth, the comparison circuit 550 generates a low voltage output signal, so that the control signal EN generated by the gate 570 and the output signal of the gate 415 are both low, and the switch 315 is set. It is not conductive. Therefore, it is possible to ensure that the boosted voltage signal Vb can be maintained within a preset voltage range to avoid excessive voltage and damage of circuit components.
在其他的實施例中,若升壓式轉換電路162所產生的升壓電壓信號Vb能夠保持在安全的電壓範圍內,也可以省略調光控制電路430的比較電路550和且閘570等電路元件和相關的連接關係。In other embodiments, if the boosted voltage signal Vb generated by the boost converter circuit 162 can be maintained within a safe voltage range, the comparison circuit 550 of the dimming control circuit 430 and the circuit components such as the gate 570 can be omitted. And related connection relationships.
電壓調整電路590會接收調光信號ACTL的運算值,而設置參考電壓產生電路451調整其所產生的參考電壓信號Vref2,以進行所需的調光運作。在本實施例中,電壓調整電路590還會依據調光信號ACTL的運算值,而設置參考電壓產生電路411調整其所產生的參考電壓信號Vref1,以搭配所需的調光功能而設置升壓式轉換電路162汲取足夠的能量。例如,在一實施例中,當調光信號ACTL的運算平均值分別為第一數值、第二數值及第三數值時(或者位於第一區間、第二區間及第三區間時),代表低功率發光裝置190的光線亮度應分別調整為80%、50%及20%。因此,調光控制電路430會設置參考電壓產生電路411和451調整參考電壓信號Vref1及Vref2,使升壓控制電路410及降壓控制電路450輸出所需的控制信號SW1和SW2,使控制電路166設置升壓式轉換電路162汲取足夠的能量,並使控制電路166設置降壓式轉換電路164輸出對應的第一電壓、第二電壓及第三電壓(及/或第一電流、第二電流及第三電流)至低功率發光裝置190,低功率發光裝置190的光線亮度因此能夠分別呈現為所需的80%、50%及20%。在其他實施例中,電壓調整電路590也可以不設置參考電壓產生電路411調整其所產生的參考電壓信號Vref1。The voltage adjustment circuit 590 receives the operation value of the dimming signal ACTL, and sets the reference voltage generation circuit 451 to adjust the reference voltage signal Vref2 generated by it to perform the required dimming operation. In this embodiment, the voltage adjustment circuit 590 further sets the reference voltage generation circuit 411 to adjust the reference voltage signal Vref1 generated by the reference voltage generation circuit 411 according to the operation value of the dimming signal ACTL to set the boost with the required dimming function. The conversion circuit 162 draws sufficient energy. For example, in an embodiment, when the calculated average value of the dimming signal ACTL is the first value, the second value, and the third value, respectively (or in the first interval, the second interval, and the third interval), it represents low. The light intensity of the power illuminating device 190 should be adjusted to 80%, 50%, and 20%, respectively. Therefore, the dimming control circuit 430 sets the reference voltage generating circuits 411 and 451 to adjust the reference voltage signals Vref1 and Vref2, so that the boost control circuit 410 and the buck control circuit 450 output the required control signals SW1 and SW2, so that the control circuit 166 The boost converter circuit 162 is configured to draw sufficient energy, and the control circuit 166 is configured to provide the buck converter circuit 164 to output the corresponding first voltage, second voltage, and third voltage (and/or the first current, the second current, and The third current) to the low power illumination device 190, the brightness of the light of the low power illumination device 190 can thus be presented as 80%, 50% and 20%, respectively. In other embodiments, the voltage adjustment circuit 590 may also adjust the reference voltage signal Vref1 generated by the reference voltage generation circuit 411.
在圖4和圖5的實施例中,當調光器110設置低功率發光裝置190產生的光線亮度越高時,參考電壓調整電路590會設置參考電壓產生電路451產生較低的參考電壓Vref2,而增加控制信號SW2的導通時間及/或工作週期(duty cycle),以增加低功率發光裝置190的光線亮度。In the embodiment of FIG. 4 and FIG. 5, when the brightness of the light generated by the low-power illumination device 190 is set by the dimmer 110, the reference voltage adjustment circuit 590 sets the reference voltage generation circuit 451 to generate a lower reference voltage Vref2. The on-time and/or duty cycle of the control signal SW2 is increased to increase the brightness of the light of the low-power illumination device 190.
在圖4和圖5的實施例中,當調光器110設置低功率發光裝置190產生的光線亮度越低時,參考電壓調整電路590會設置參考電壓產生電路451產生較高的參考電壓Vref2,而降低控制信號SW2的導通時間及/或工作週期,以降低低功率發光裝置190的光線亮度。In the embodiment of FIG. 4 and FIG. 5, when the brightness of the light generated by the low-power illumination device 190 is set to be low, the reference voltage adjustment circuit 590 sets the reference voltage generation circuit 451 to generate a higher reference voltage Vref2. The on-time and/or duty cycle of the control signal SW2 is reduced to reduce the brightness of the light of the low-power illumination device 190.
在圖4和圖5的實施例中,當調光器110設置低功率發光裝置190產生的光線亮度越高時,參考電壓調整電路590也可以設置參考電壓產生電路411產生較低的參考電壓Vref1,而增加控制信號SW1的導通時間及/或工作週期。因此,升壓式轉換電路162能夠汲取更多的能源,使降壓式轉換器164能夠提供足夠的能源至低功率發光裝置190,而能避免低功率發光裝置190發生光線閃爍的問題。In the embodiment of FIG. 4 and FIG. 5, the reference voltage adjustment circuit 590 can also set the reference voltage generation circuit 411 to generate a lower reference voltage Vref1 when the brightness of the light generated by the low-power illumination device 190 is set to be higher. And increase the on-time and/or duty cycle of the control signal SW1. Therefore, the boost converter circuit 162 can draw more energy, enable the buck converter 164 to provide sufficient energy to the low power illumination device 190, and avoid the problem of light flashing of the low power illumination device 190.
在圖4的實施例中,當調光器110設置低功率發光裝置190產生的光線亮度越低時,參考電壓調整電路590也可以設置參考電壓產生電路411產生較高的參考電壓Vref1,而降低控制信號SW1的導通時間及/或工作週期。因此,升壓式轉換電路162能夠減少所汲取的能源,使降壓式轉換器164既能夠提供足夠的能源至低功率發光裝置190,而避免低功率發光裝置190發生光線閃爍的問題,還能節省能源的消耗,以提升能源使用效率。In the embodiment of FIG. 4, when the brightness of the light generated by the low-power illumination device 190 is set to be low, the reference voltage adjustment circuit 590 can also set the reference voltage generation circuit 411 to generate a higher reference voltage Vref1. The on time and/or duty cycle of the control signal SW1. Therefore, the boost converter circuit 162 can reduce the energy drawn, so that the buck converter 164 can provide sufficient energy to the low-power light-emitting device 190, and avoid the problem of light flickering in the low-power light-emitting device 190. Save energy consumption to improve energy efficiency.
圖6是照明系統100運作時所產生的數個信號的一實施例簡化後的時序圖,以下將以圖1~5進一步說明照明系統100的運作方式。在圖6的實施例中,繪示了一段時間的整流電壓信號Vr簡化後的波形。6 is a simplified timing diagram of an embodiment of a plurality of signals generated during operation of illumination system 100. The manner in which illumination system 100 operates will be further described below with reference to FIGS. In the embodiment of Fig. 6, the simplified waveform of the rectified voltage signal Vr for a period of time is shown.
在圖6的時間T1時,當調光器110所產生的相位截斷信號Vtr未被截斷時,整流電路140所產生的整流電壓信號Vr會大於預設電壓信號Vt0。調光控制電路430接收到對應的調光信號ACTL,當調光信號ACTL的運算值大於預設電壓信號Vtl時,會設置升壓控制電路410以控制信號SW1設置開關315的導通狀態,以間歇性地導通升壓式轉換電路162的開關315,使升壓式轉換電路162運作於電流導通模式。At time T1 of FIG. 6, when the phase cutoff signal Vtr generated by the dimmer 110 is not cut off, the rectified voltage signal Vr generated by the rectifying circuit 140 is greater than the preset voltage signal Vt0. The dimming control circuit 430 receives the corresponding dimming signal ACTL. When the calculated value of the dimming signal ACTL is greater than the preset voltage signal Vtl, the boost control circuit 410 is set to set the conduction state of the switch 315 with the control signal SW1 to intermittently The switch 315 of the boost converter circuit 162 is turned on to operate the boost converter circuit 162 in a current conducting mode.
在時間T2時,當調光器110所產生的相位截斷信號Vtr被截斷時,整流電路140所產生的整流電壓信號Vr會小於預設電壓信號Vt0。調光控制電路430接收到對應的調光信號ACTL,當調光信號ACTL的運算值小於預設電壓信號Vtl時,會設置升壓控制電路410產生低電位的輸出信號,使升壓式轉換電路162的開關315維持不導通狀態,而使升壓式轉換電路162運作於電流停止模式。At time T2, when the phase cutoff signal Vtr generated by the dimmer 110 is cut off, the rectified voltage signal Vr generated by the rectifying circuit 140 is less than the preset voltage signal Vt0. The dimming control circuit 430 receives the corresponding dimming signal ACTL. When the calculated value of the dimming signal ACTL is less than the preset voltage signal Vtl, the boost control circuit 410 is configured to generate a low-potential output signal to enable the boosting conversion circuit. The switch 315 of 162 maintains a non-conducting state, and causes the boost converter circuit 162 to operate in a current stop mode.
調光控制電路430會依據調光信號ACTL的運算值,而設置降壓控制電路450將控制信號SW2間歇性地設置為高電位,以間歇性地導通降壓式轉換電路164的開關334,使降壓式轉換電路164能夠提供低功率發光裝置190所需的電壓信號Vout,而產生所需的亮度。此外,調光控制電路430會設置降壓式轉換電路164提供至低功率發光裝置190的電壓信號Vout大於低功率發光裝置190的最低負載電壓Vmin,以確保低功率發光裝置190能夠持續發光,而不會發生閃爍的現象。The dimming control circuit 430 sets the buck control circuit 450 to intermittently set the control signal SW2 to a high level according to the calculated value of the dimming signal ACTL to intermittently turn on the switch 334 of the buck converter circuit 164. The buck converter circuit 164 is capable of providing the voltage signal Vout required by the low power lighting device 190 to produce the desired brightness. In addition, the dimming control circuit 430 sets the voltage signal Vout provided by the buck converter circuit 164 to the low power illuminating device 190 to be greater than the lowest load voltage Vmin of the low power illuminating device 190 to ensure that the low power illuminating device 190 can continuously emit light. No flickering will occur.
因此,控制電路166會設置升壓式轉換電路162在時段T1中向電子式變壓器120汲取足夠的電流,使電子式變壓器120在時段T1和T2有足夠的能源而能正常運作。在時段T2中,由於相位截斷信號Vtr已經被截斷而無電流可汲取,控制電路166還可以設置升壓式轉換電路162暫停運作,以節約能源。此外,控制電路166還能依據調光器110的設定(在本實施例中,為相位截斷信號Vtr及/或整流電壓信號Vr被截斷的程度),而設置降壓式轉換電路164依據升壓式轉換電路162於時段T1所汲取的能量而供電給低功率發光裝置190,使低功率發光裝置190可以持續而穩定地提供所需的照明功能。Therefore, the control circuit 166 sets the boost converter circuit 162 to draw sufficient current into the electronic transformer 120 during the period T1 so that the electronic transformer 120 has sufficient energy for the periods T1 and T2 to operate normally. In the period T2, since the phase cutoff signal Vtr has been cut off and no current is available, the control circuit 166 can also set the boost converter circuit 162 to suspend operation to save energy. In addition, the control circuit 166 can also set the buck conversion circuit 164 according to the setting of the dimmer 110 (in the present embodiment, the degree of the phase cutoff signal Vtr and/or the rectified voltage signal Vr is cut off). The conversion circuit 162 supplies power to the low power illumination device 190 at the energy extracted during the time period T1, so that the low power illumination device 190 can continuously and stably provide the desired illumination function.
在圖6的實施例中,控制電路166能夠設置升壓式轉換電路162向電子式變壓器120汲取足夠的電流,而能夠搭配前級的電路元件正常地運作。此外,還能夠依據使用者對於調光器110的設定,而調整降壓式轉換電路164的運作,而使低功率發光裝置190能夠提供所需的亮度。In the embodiment of FIG. 6, the control circuit 166 can provide the boost converter circuit 162 to draw sufficient current to the electronic transformer 120 to operate normally with the circuit components of the preceding stage. In addition, the operation of the buck converter circuit 164 can be adjusted depending on the user's settings for the dimmer 110, so that the low power illumination device 190 can provide the desired brightness.
在上述的實施例中,調光控制電路430可以依據調光信號ACTL的運算值,而設置降壓式轉換電路164輸出對應的電流值至低功率發光裝置190,使低功率發光裝置190能夠產生所需的調光功能。例如,圖7至圖9為調光控制電路430依據調光信號ACTL而調整低功率發光裝置190的電流值的三個實施例簡化後的特性曲線圖。In the above embodiment, the dimming control circuit 430 can set the buck converter circuit 164 to output a corresponding current value to the low power illuminating device 190 according to the calculated value of the dimming signal ACTL, so that the low power illuminating device 190 can generate The required dimming function. For example, FIG. 7 to FIG. 9 are simplified characteristic diagrams of three embodiments in which the dimming control circuit 430 adjusts the current value of the low power light emitting device 190 according to the dimming signal ACTL.
在圖7的實施例中,調光控制電路430會採用線性的調光方式,當調光信號ACTL的運算值分別為A1、A2和A3時,調光控制電路430會設置降壓式轉換電路164分別輸出對應的電流值B1、B2和B3,使低功率發光裝置190能夠產生所需的調光功能。因此,在一段可調光的範圍中,當調光信號ACTL的運算值A1與A2的差距等於A2與A3的差距時,低功率發光裝置190的電流值B1與B2的差距會等於B2與B3的差距。In the embodiment of FIG. 7, the dimming control circuit 430 adopts a linear dimming mode. When the operational values of the dimming signal ACTL are A1, A2, and A3, respectively, the dimming control circuit 430 sets a buck conversion circuit. 164 outputs corresponding current values B1, B2, and B3, respectively, to enable the low power illumination device 190 to produce the desired dimming function. Therefore, in a range of dimming, when the difference between the operational values A1 and A2 of the dimming signal ACTL is equal to the difference between A2 and A3, the difference between the current values B1 and B2 of the low-power illumination device 190 is equal to B2 and B3. difference.
在圖8的實施例中,調光控制電路430會採用非線性的調光方式,當調光信號ACTL的運算值分別為A1、A2和A3時,調光控制電路430會設置降壓式轉換電路164分別輸出對應的電流值B4、B5和B6,使低功率發光裝置190能夠產生所需的調光功能。因此,在一段可調光的範圍中,當調光信號ACTL的運算值A1與A2的差距等於A2與A3的差距時,低功率發光裝置190的電流值B4與B5的差距會大於B5與B6的差距。In the embodiment of FIG. 8, the dimming control circuit 430 adopts a nonlinear dimming mode. When the operational values of the dimming signal ACTL are A1, A2, and A3, respectively, the dimming control circuit 430 sets a buck conversion. Circuit 164 outputs corresponding current values B4, B5, and B6, respectively, to enable low power illumination device 190 to produce the desired dimming function. Therefore, in a range of dimming, when the difference between the operational values A1 and A2 of the dimming signal ACTL is equal to the difference between A2 and A3, the difference between the current values B4 and B5 of the low-power illumination device 190 is greater than that of B5 and B6. difference.
在圖8的實施例中,當調光信號ACTL的運算值分別為A1、A2和A3時,可將低功率發光裝置190的電流值B4、B5和B6設置為低於圖7的電流值B1、B2和B3,而使得低功率發光裝置190所產生的亮度較低,而能夠節約較多的能源。In the embodiment of FIG. 8, when the operational values of the dimming signal ACTL are A1, A2, and A3, respectively, the current values B4, B5, and B6 of the low-power light-emitting device 190 can be set lower than the current value B1 of FIG. , B2 and B3, so that the low-power light-emitting device 190 produces lower brightness, and can save more energy.
在圖9的實施例中,調光控制電路430會採用非線性的調光方式,當調光信號ACTL的運算值分別為A1、A2和A3時,調光控制電路430會設置降壓式轉換電路164分別輸出對應的電流值B7、B8和B9,使低功率發光裝置190能夠產生所需的調光功能。因此,在一段可調光的範圍中,當調光信號ACTL的運算值A1與A2的差距等於A2與A3的差距時,低功率發光裝置190的電流值B7與B8的差距會小於B8與B9的差距。In the embodiment of FIG. 9, the dimming control circuit 430 adopts a nonlinear dimming mode. When the operational values of the dimming signal ACTL are A1, A2, and A3, respectively, the dimming control circuit 430 sets a buck conversion. Circuit 164 outputs corresponding current values B7, B8, and B9, respectively, to enable low power illumination device 190 to produce the desired dimming function. Therefore, in a range of dimming, when the difference between the operational values A1 and A2 of the dimming signal ACTL is equal to the difference between A2 and A3, the difference between the current values B7 and B8 of the low-power illumination device 190 is smaller than that of B8 and B9. difference.
在圖9的實施例中,當調光信號ACTL的運算值分別為A1、A2和A3時,可將低功率發光裝置190的電流值B7、B8和B9設置為高於圖7的電流值B1、B2和B3,而使得低功率發光裝置190所產生的亮度較高。由於降壓式轉換電路164必須提供較多能源至低功率發光裝置190,因此控制電路166會設置升壓式轉換電路162向電子式變壓器120汲取較多的電流。因此,當升壓式轉換電路162向電子式變壓器120汲取的電流不足,而使得電子式變壓器120無法正常運作的情況能夠得到改善,以提升低功率發光裝置190與電子式變壓器的相容性問題。In the embodiment of FIG. 9, when the operational values of the dimming signal ACTL are A1, A2, and A3, respectively, the current values B7, B8, and B9 of the low-power light-emitting device 190 can be set higher than the current value B1 of FIG. , B2 and B3, such that the brightness produced by the low power illumination device 190 is higher. Since the buck converter circuit 164 must provide more energy to the low power lighting device 190, the control circuit 166 will provide the boost converter circuit 162 to draw more current into the electronic transformer 120. Therefore, when the current drawn by the boost converter circuit 162 to the electronic transformer 120 is insufficient, the electronic transformer 120 can be prevented from operating normally, so as to improve the compatibility between the low-power light-emitting device 190 and the electronic transformer. .
為了使電子式變壓器120與低功率發光裝置190搭配運作時的相容性更好,因此,在時段T1的電流導通模式中,控制電路166還可以設置升壓式轉換電路162以至少兩種模式向電子式變壓器120汲取電流。在圖10的實施例中,控制電路166會在時段T1的第一時段T11和第二時段T12中,分別設置升壓式轉換電路162向電子式變壓器120汲取不同的電流,並且使升壓式轉換電路162在第一時段T11所汲取的電流大於升壓式轉換電路162在第二時段T12所汲取的電流。In order to make the electronic transformer 120 have better compatibility with the low power lighting device 190, the control circuit 166 may also set the boost converter circuit 162 in at least two modes in the current conducting mode of the period T1. Current is drawn to the electronic transformer 120. In the embodiment of FIG. 10, the control circuit 166 may respectively set the boost converter circuit 162 to draw different currents to the electronic transformer 120 during the first period T11 and the second period T12 of the period T1, and make the boost type The current drawn by the conversion circuit 162 during the first time period T11 is greater than the current drawn by the boost conversion circuit 162 during the second time period T12.
在上述的實施例中,控制電路可以採用分段的方式調整控制信號SW1的頻率、工作週期、導通時間、不導通時間等參數,使電流Iet的最大值和最小值等參數會於一段預設時間內保持在預設值,並且可以採用兩段或更多段的方式進行調整。此外,在上述的實施例中,控制電路可以採用連續的方式調整控制信號SW1的頻率、工作週期、導通時間、不導通時間等參數,使電流Iet的最大值和最小值等參數可以採用連續的方式改變。In the above embodiment, the control circuit can adjust the parameters such as the frequency, the duty cycle, the on-time, and the non-conduction time of the control signal SW1 in a segmented manner, so that the parameters such as the maximum value and the minimum value of the current Iet are preset. The time is kept at the preset value and can be adjusted in two or more segments. In addition, in the above embodiment, the control circuit can adjust parameters such as the frequency, the duty cycle, the on-time, and the non-conduction time of the control signal SW1 in a continuous manner, so that the parameters such as the maximum value and the minimum value of the current Iet can be continuous. The way is changed.
在圖10的實施例中,模式控制電路430會設置參考電壓產生電路411及/或週期信號產生電路415,而使比較電路417中產生合適的控制信號SW1以控制開關315,使升壓式轉換電路162可以向電子式變壓器120汲取不同的電流。In the embodiment of FIG. 10, the mode control circuit 430 sets the reference voltage generating circuit 411 and/or the periodic signal generating circuit 415, and causes the appropriate control signal SW1 to be generated in the comparing circuit 417 to control the switch 315 to enable the boosting conversion. Circuit 162 can draw different currents to electronic transformer 120.
例如,模式控制電路430可以設置參考電壓產生電路411調整參考電壓信號Vref1的信號值等方式,使得升壓式轉換電路162依據第一時段T11的控制信號SW1而向電子式變壓器120的電流大於升壓式轉換電路162依據第二時段T12的控制信號SW1而向電子式變壓器120的電流。For example, the mode control circuit 430 may set the reference voltage generating circuit 411 to adjust the signal value of the reference voltage signal Vref1, etc., such that the boosting conversion circuit 162 has a current greater than liter to the electronic transformer 120 according to the control signal SW1 of the first time period T11. The voltage conversion circuit 162 supplies current to the electronic transformer 120 in accordance with the control signal SW1 of the second period T12.
例如,在一實施例中,控制電路166會設置升壓式轉換電路162於第一時段T11向電子式變壓器120所汲取的電流Iet的最小值大於升壓式轉換電路162於第二時段T12向電子式變壓器120所汲取的電流Iet的最小值。For example, in an embodiment, the control circuit 166 sets the minimum value of the current Iet drawn by the boost converter circuit 162 to the electronic transformer 120 during the first time period T11 to be greater than the boost converter circuit 162 in the second time period T12. The minimum value of the current Iet drawn by the electronic transformer 120.
在其他實施例中,控制電路166會設置升壓式轉換電路162於第一時段T11向電子式變壓器120所汲取的電流Iet的最大值大於升壓式轉換電路162於第二時段T12向電子式變壓器120所汲取的電流Iet的最大值。In other embodiments, the control circuit 166 sets the maximum value of the current Iet drawn by the boost converter circuit 162 to the electronic transformer 120 during the first time period T11 to be greater than the boost mode conversion circuit 162 to the electronic time during the second time period T12. The maximum value of the current Iet drawn by the transformer 120.
在其他實施例中,控制電路166也可以設置控制信號SW1的頻率、工作週期、導通時間、不導通時間等參數,使得升壓式轉換電路162於第一時段T11向電子式變壓器120所汲取的電流Iet會大於升壓式轉換電路162於第二時段T12向電子式變壓器120所汲取的電流Iet。In other embodiments, the control circuit 166 may also set parameters such as the frequency, duty cycle, on-time, and non-conduction time of the control signal SW1, so that the boost converter circuit 162 draws the electronic transformer 120 during the first time period T11. The current Iet may be greater than the current Iet drawn by the boost converter circuit 162 to the electronic transformer 120 during the second time period T12.
在圖10的實施例中,由於升壓式轉換電路162於第一時段T11已經向電子式變壓器120汲取足夠大的電流,使電子式變壓器120能夠正常運作。因此,升壓式轉換電路162於第二時段T12向電子式變壓器120所汲取的電流Iet的最小值可以設置為低於電子式變壓器120的最低負載電流值Imin。此時,電子式變壓器120不但仍然能夠正常運作,並且還可以降低硬體設計的限制及節約能源。In the embodiment of FIG. 10, since the boost converter circuit 162 has drawn a sufficiently large current to the electronic transformer 120 during the first time period T11, the electronic transformer 120 can operate normally. Therefore, the minimum value of the current Iet drawn by the boost converter circuit 162 to the electronic transformer 120 during the second time period T12 may be set lower than the lowest load current value Imin of the electronic transformer 120. At this time, the electronic transformer 120 can not only operate normally, but also can reduce the limitation of the hardware design and save energy.
在其他的實施例中,控制電路166也可以設置升壓式轉換電路162於第一時段T11向電子式變壓器120所汲取的電流Iet的最小值低於電子式變壓器120的最低負載電流值Imin。In other embodiments, the control circuit 166 may also set the minimum value of the current Iet drawn by the boost converter circuit 162 to the electronic transformer 120 during the first time period T11 to be lower than the lowest load current value Imin of the electronic transformer 120.
在上述的實施例中,各個功能方塊都能夠以合適的電路架構實施,而不拘泥於以上的實施方式。例如,升壓式轉換電路162可以採用升壓電路(boost circuit)、升降壓電路(buck-boost circuit)或充電泵電路(charge pump circuit)等方式實施。降壓式轉換電路164可以採用降壓電路(buck circuit)或升降壓電路等方式實施。控制電路166也可以採用邏輯電路、微處理器或微控制器等方式實施。In the above embodiments, each functional block can be implemented in a suitable circuit architecture without being limited to the above embodiments. For example, the boost converter circuit 162 can be implemented by a boost circuit, a buck-boost circuit, or a charge pump circuit. The buck converter circuit 164 can be implemented by a buck circuit or a buck-boost circuit. Control circuit 166 can also be implemented in the form of logic circuits, microprocessors or microcontrollers.
在上述的實施例中,各個功能方塊皆能夠以一個或多個電路元件實施,或者各個功能方塊也能夠適當的組合。例如,圖1中整流電路140、電源轉換器160和低功率發光裝置190可以一併設置於燈管或燈泡中,並且採用適當的端子(圖1中未繪示)與其他電路元件連接。In the above embodiments, each functional block can be implemented by one or more circuit elements, or the respective functional blocks can be combined as appropriate. For example, the rectifier circuit 140, the power converter 160, and the low-power light-emitting device 190 of FIG. 1 may be disposed together in a lamp or a bulb, and connected to other circuit components by using appropriate terminals (not shown in FIG. 1).
在上述的實施例中,電源轉換器160僅採用一個升壓式轉換電路162及一個降壓式轉換電路164的方式實施。在其他實施例中,電源轉換器160可以採用一個或多個升壓式轉換電路、降壓式轉換電路及/或升降壓式轉換電路,並且使輸出至低功率發光裝置190的電壓高於低功率發光裝置190的最低負載電壓。In the above embodiment, the power converter 160 is implemented by only one boost converter circuit 162 and one buck converter circuit 164. In other embodiments, the power converter 160 can employ one or more boost converter circuits, buck converter circuits, and/or buck-boost converter circuits, and the voltage output to the low power lighting device 190 is higher than the low voltage. The lowest load voltage of the power illuminating device 190.
在上述的實施例中,各個功能方塊及信號以高態有效(active high)的方式進行說明。在其他的實施例中,也可以依據不同的設計考量,而將各個功能方塊及信號分別以高態有效或低態有效(active low)的方式實施。In the above embodiments, each functional block and signal are described in an active high manner. In other embodiments, each functional block and signal may be implemented in an active high or active low manner according to different design considerations.
在上述的實施例中,照明系統的電源轉換器能夠依據調光器的設定而運作在二個或多個運作模式。在電流導通模式時,電源轉換器的升壓式轉換電路能向電子式變壓器汲取足夠的電流,使電子式變壓器正常運作。而在電流停止模式時,電源轉換器的升壓式轉換電路能暫停向電子式變壓器汲取電流,以節約能源。此外,電源轉換器的降壓式轉換電路能夠依據升壓式轉換電路的升壓輸出信號而供電至低功率發光裝置,使低功率發光裝置能夠穩定地提供照明的功能。In the above embodiments, the power converter of the lighting system is capable of operating in two or more modes of operation depending on the settings of the dimmer. In the current conduction mode, the boost converter circuit of the power converter can draw enough current to the electronic transformer to make the electronic transformer operate normally. In the current stop mode, the boost converter circuit of the power converter can suspend the current drawn from the electronic transformer to save energy. In addition, the buck converter circuit of the power converter can supply power to the low power illuminating device according to the boost output signal of the boost converter circuit, so that the low power illuminating device can stably provide the function of illumination.
此外,電源轉換器的控制電路能夠依據調光器的設定,而設置降壓式轉換電路輸出所需的電壓及/或電流至低功率發光裝置,使低功率發光裝置產生所需的亮度,而達到穩定調光的功能。In addition, the control circuit of the power converter can set the voltage and/or current required for the output of the buck converter circuit to the low-power light-emitting device according to the setting of the dimmer, so that the low-power light-emitting device generates the required brightness, and Achieve stable dimming.
電源轉換器的控制電路還可以藉由設置升壓式轉換電路採用多種電流汲取模式,而使得低功率發光裝置與調光器和電子式變壓器等電路元件搭配使用時更能夠正常運作,而解決相容性的問題。The control circuit of the power converter can also adopt various current extraction modes by setting the boost converter circuit, so that the low-power light-emitting device can work normally with the circuit components such as the dimmer and the electronic transformer, and the phase is solved. The problem of tolerance.
在說明書及申請專利範圍中使用了某些詞彙來指稱特定的元件。然而,所屬技術領域中具有通常知識者應可理解,同樣的元件可能會用不同的名詞來稱呼。說明書及申請專利範圍並不以名稱的差異做為區分元件的方式,而是以元件在功能上的差異來做為區分的基準。在說明書及申請專利範圍所提及的「包含」為開放式的用語,故應解釋成「包含但不限定於」。另外,「耦接」在此包含任何直接及間接的連接手段。因此,若文中描述第一元件耦接於第二元件,則代表第一元件可通過電性連接或無線傳輸、光學傳輸等信號連接方式而直接地連接於第二元件,或者通過其他元件或連接手段間接地電性或信號連接至該第二元件。Certain terms are used throughout the description and claims to refer to particular elements. However, those of ordinary skill in the art should understand that the same elements may be referred to by different nouns. The specification and the scope of patent application do not use the difference in name as the way to distinguish the components, but the difference in function of the components as the basis for differentiation. The term "including" as used in the specification and the scope of the patent application is an open term and should be interpreted as "including but not limited to". In addition, "coupled" includes any direct and indirect means of attachment herein. Therefore, if the first element is described as being coupled to the second element, the first element can be directly connected to the second element by electrical connection or wireless transmission, optical transmission or the like, or by other elements or connections. The means is indirectly electrically or signally connected to the second component.
在此所使用的「及/或」的描述方式,包含所列舉的其中之一或多個項目的任意組合。另外,除非說明書中特別指明,否則任何單數格的用語都同時包含複數格的涵義。The description of "and/or" as used herein includes any combination of one or more of the listed items. In addition, the terms of any singular are intended to include the meaning of the plural, unless otherwise specified in the specification.
以上僅為本發明的較佳實施例,凡依本發明請求項所做的均等變化與修飾,皆應屬本發明的涵蓋範圍。The above are only the preferred embodiments of the present invention, and all changes and modifications made to the claims of the present invention are intended to be within the scope of the present invention.
100...照明系統100. . . Lighting system
110...調光器110. . . Light modulator
120...電子式變壓器120. . . Electronic transformer
140...整流電路140. . . Rectifier circuit
160...電源轉換器160. . . Power converter
162...升壓式轉換電路162. . . Boost converter circuit
164...降壓式轉換電路164. . . Buck converter circuit
166...控制電路166. . . Control circuit
190...低功率發光裝置190. . . Low power lighting device
310、314、331、335...電容310, 314, 331, 335. . . capacitance
311、336...電感311, 336. . . inductance
312、313、316、318、319、332...電阻312, 313, 316, 318, 319, 332. . . resistance
315、334...開關315, 334. . . switch
317、333...二極體317, 333. . . Dipole
410...升壓控制電路410. . . Boost control circuit
41...參考電壓產生電路41. . . Reference voltage generating circuit
413...比較電路413. . . Comparison circuit
415...且閘415. . . Brake
430...調光控制電路430. . . Dimming control circuit
450...降壓控制電路450. . . Buck control circuit
451...參考電壓產生電路451. . . Reference voltage generating circuit
453...比較電路453. . . Comparison circuit
510...運算值計算電路510. . . Operation value calculation circuit
530、550...比較電路530, 550. . . Comparison circuit
570...且閘570. . . Brake
590...參考電壓調整電路590. . . Reference voltage adjustment circuit
A1~A3...調光信號的運算值A1~A3. . . Operational value of the dimming signal
ACTL...調光信號ACTL. . . Dimming signal
B1~B9...電流值B1~B9. . . Current value
CS...感測信號CS. . . Sense signal
FB...回饋信號FB. . . Feedback signal
Iet...電流Iet. . . Current
Imin...最小負載電流Imin. . . Minimum load current
SW1、SW2...控制信號SW1, SW2. . . control signal
SEN1、SEN2...端點SEN1, SEN2. . . End point
T1、T11、T12、T2...時段T1, T11, T12, T2. . . Time slot
Vb...升壓電壓信號Vb. . . Boost voltage signal
Vc...轉換電壓信號Vc. . . Converting voltage signal
Vin...輸入電壓信號Vin. . . Input voltage signal
Vmin...最低負載電壓Vmin. . . Minimum load voltage
Vout...降壓電壓信號Vout. . . Step-down voltage signal
Vr...整流電壓信號Vr. . . Rectified voltage signal
Vref1、Vref2...參考電壓信號Vref1, Vref2. . . Reference voltage signal
Vsen...感測信號Vsen. . . Sense signal
Vt0、Vth、Vt1...預設電壓信號Vt0, Vth, Vt1. . . Preset voltage signal
Vtr...相位截斷信號Vtr. . . Phase cutoff signal
圖1是本發明的照明系統的一實施例簡化後的功能方塊圖。BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a simplified functional block diagram of an embodiment of an illumination system of the present invention.
圖2是圖1的照明系統運作時所產生的信號的一實施例簡化後的時序圖。2 is a simplified timing diagram of an embodiment of a signal generated when the illumination system of FIG. 1 is in operation.
圖3是圖1的電源轉換器的一實施例簡化後的電路圖。3 is a simplified circuit diagram of an embodiment of the power converter of FIG. 1.
圖4是圖1的電源轉換器的控制電路的一實施例簡化後的電路圖。4 is a simplified circuit diagram of an embodiment of a control circuit of the power converter of FIG. 1.
圖5是圖4的調光控制電路的一實施例簡化後的電路圖。Figure 5 is a simplified circuit diagram of an embodiment of the dimming control circuit of Figure 4.
圖6是圖1的照明系統運作時所產生的信號的另一實施例簡化後的時序圖。6 is a simplified timing diagram of another embodiment of a signal generated when the illumination system of FIG. 1 is in operation.
圖7至圖9為圖1的電源轉換器的控制電路調整低功率發光裝置的電流值的三個實施例簡化後的曲線圖。7 to 9 are simplified diagrams of three embodiments in which the control circuit of the power converter of FIG. 1 adjusts the current value of the low power lighting device.
圖10是圖1的照明系統運作時所產生的信號的另一實施例簡化後的時序圖。10 is a simplified timing diagram of another embodiment of a signal generated when the illumination system of FIG. 1 is in operation.
100...照明系統100. . . Lighting system
110...調光器110. . . Light modulator
120...電子式變壓器120. . . Electronic transformer
140...整流電路140. . . Rectifier circuit
160...電源轉換器160. . . Power converter
162...升壓式轉換電路162. . . Boost converter circuit
164...降壓式轉換電路164. . . Buck converter circuit
166...控制電路166. . . Control circuit
190...低功率發光裝置190. . . Low power lighting device
Vin...輸入電壓信號Vin. . . Input voltage signal
Vtr...相位截斷信號Vtr. . . Phase cutoff signal
Vc...轉換電壓信號Vc. . . Converting voltage signal
Vr...整流電壓信號Vr. . . Rectified voltage signal
Vb...升壓電壓信號Vb. . . Boost voltage signal
Vout...降壓電壓信號Vout. . . Step-down voltage signal
Iet...電流Iet. . . Current
Claims (20)
一升壓式轉換電路,耦接於該整流電路,依據該整流電壓信號而產生一升壓電壓信號;
一降壓式轉換電路,耦接於該升壓式轉換電路,依據該升壓電壓信號而產生一降壓電壓信號,以供電至該低功率發光裝置;以及
一控制電路,耦接於該升壓式轉換電路及該降壓式轉換電路,當該整流電壓信號大於一預設電壓信號時,將該升壓式轉換電路設置為運作於一電流導通模式,以向該電子式變壓器汲取電流,並且當該整流電壓信號小於該預設電壓信號時,將該升壓式轉換電路設置為運作於一電流停止模式,以暫停向該電子式變壓器汲取電流;
其中該升壓電壓信號的電位會高於該整流電壓信號的電位;該降壓電壓信號的電位會低於該升壓電壓信號的電位;該控制電路會依據該整流信號而產生一運算值,當該運算值為一第一數值時,該控制電路會設置該降壓式轉換電路將該降壓電壓信號調整為一第一電壓值,而當該運算值為一第二數值時,該控制電路會設置該降壓式轉換電路將該降壓電壓信號調整為一第二電壓值。A power converter of a lighting system is coupled to an electronic transformer by a rectifying circuit, and the electronic transformer generates a converted voltage signal according to a phase cutoff signal provided by a dimmer, the rectifying The circuit generates a rectified voltage signal according to the converted voltage signal, and the power converter supplies power to a low-power illumination device according to the rectified voltage signal, the power converter includes:
a step-up conversion circuit coupled to the rectifier circuit, generating a boosted voltage signal according to the rectified voltage signal;
a step-down conversion circuit coupled to the boost converter circuit, generating a step-down voltage signal according to the boost voltage signal to supply power to the low-power light-emitting device; and a control circuit coupled to the riser The voltage conversion circuit and the buck conversion circuit, when the rectified voltage signal is greater than a predetermined voltage signal, the boost converter circuit is set to operate in a current conduction mode to draw current from the electronic transformer, And when the rectified voltage signal is less than the preset voltage signal, setting the boost converter circuit to operate in a current stop mode to suspend drawing current to the electronic transformer;
The potential of the boosting voltage signal is higher than the potential of the rectified voltage signal; the potential of the step-down voltage signal is lower than the potential of the boosting voltage signal; and the control circuit generates an operational value according to the rectified signal. When the operation value is a first value, the control circuit sets the buck conversion circuit to adjust the step-down voltage signal to a first voltage value, and when the operation value is a second value, the control The circuit sets the buck conversion circuit to adjust the step-down voltage signal to a second voltage value.
一升壓控制電路,用於設置該升壓式轉換電路的一第一開關的導通狀態;
一降壓控制電路,用於設置該降壓式轉換電路的一第二開關的導通狀態;
一調光控制電路,耦接於該升壓控制電路及該降壓控制電路,當該整流電壓信號大於一預設電壓信號時,會設置該升壓控制電路間歇性地導通該第一開關,使該升壓式轉換電路運作於一電流導通模式,以向該電子式變壓器汲取電流,並且當該整流電壓信號小於該預設電壓信號時,會設置該升壓控制電路不導通該第一開關,使該升壓式轉換電路運作於一電流停止模式,以暫停向該電子式變壓器汲取電流;
其中該升壓電壓信號的電位會高於該整流電壓信號的電位;該降壓電壓信號的電位會低於該升壓電壓信號的電位;該調光控制電路會依據該整流信號而產生一運算值,當該運算值為一第一數值時,該調光控制電路會設置該降壓控制電路設置該第二開關的導通狀態,使該降壓式轉換電路將該降壓電壓信號調整為一第一電壓值,而當該運算值為一第二數值時,該調光控制電路會設置該降壓控制電路設置該第二開關的導通狀態,使該降壓式轉換電路將該降壓電壓信號調整為一第二電壓值。A power converter control circuit for a lighting system; the lighting system includes a dimmer, an electronic transformer, a rectifier circuit, a boost converter circuit, and a buck converter circuit; the dimmer is based on an input The voltage signal generates a phase cutoff signal; the electronic transformer is coupled to the dimmer, and generates a converted voltage signal according to the phase cutoff signal; the rectifier circuit is coupled to the electronic transformer, and the converted voltage is The signal generates a rectified voltage signal; the boosting conversion circuit is coupled to the rectifying circuit, and generates a boosting voltage signal according to the rectified voltage signal; the buck converting circuit is coupled to the boosting conversion The circuit generates a step-down voltage signal according to the boost voltage signal to supply power to a low-power light-emitting device; the power converter control circuit is coupled to the boost converter circuit and the buck converter circuit And the power converter control circuit comprises:
a boost control circuit for setting a conduction state of a first switch of the boost converter circuit;
a step-down control circuit for setting a conduction state of a second switch of the buck conversion circuit;
a dimming control circuit coupled to the boost control circuit and the buck control circuit, when the rectified voltage signal is greater than a predetermined voltage signal, the boost control circuit is configured to intermittently turn on the first switch, The boost converter circuit is operated in a current conducting mode to draw current from the electronic transformer, and when the rectified voltage signal is less than the preset voltage signal, the boost control circuit is configured to not conduct the first switch Causing the boost converter circuit to operate in a current stop mode to suspend current draw to the electronic transformer;
The potential of the boost voltage signal is higher than the potential of the rectified voltage signal; the potential of the buck voltage signal is lower than the potential of the boost voltage signal; the dimming control circuit generates an operation according to the rectified signal a value, when the operation value is a first value, the dimming control circuit sets the buck control circuit to set an on state of the second switch, so that the buck conversion circuit adjusts the buck voltage signal to a a first voltage value, and when the operation value is a second value, the dimming control circuit sets the buck control circuit to set an on state of the second switch, so that the buck conversion circuit converts the buck voltage The signal is adjusted to a second voltage value.
一第一參考電壓產生電路,用於產生一第一參考電壓信號;
一第一比較電路,依據該升壓式轉換電路的一感測信號及該第一參考電壓信號而產生一第一控制信號,以控制該第一開關的導通狀態;
一第二參考電壓產生電路,用於產生一第二參考電壓信號;以及
一第二比較電路,依據該降壓式轉換電路的一感測信號及該第二參考電壓信號而產生一第二控制信號,以控制該第二開關的導通狀態;
其中該調光控制電路會依據該運算值而設置該第二參考電壓產生電路該第二參考電壓產生電路調整該第二參考電壓信號,以調整該第二開關的導通狀態。The power converter control circuit of claim 10, further comprising:
a first reference voltage generating circuit for generating a first reference voltage signal;
a first comparison circuit generates a first control signal according to a sensing signal of the boost converter circuit and the first reference voltage signal to control an on state of the first switch;
a second reference voltage generating circuit for generating a second reference voltage signal; and a second comparing circuit for generating a second control according to a sensing signal of the buck converting circuit and the second reference voltage signal a signal to control a conduction state of the second switch;
The dimming control circuit sets the second reference voltage generating circuit according to the calculated value, and the second reference voltage generating circuit adjusts the second reference voltage signal to adjust the conductive state of the second switch.
當該整流電壓信號小於一預設電壓信號時,將該升壓式轉換電路的一第一開關設置為不導通,使該升壓式轉換電路運作於一電流停止模式,以暫停向該電子式變壓器汲取電流;
當該整流電壓信號大於該預設電壓信號時,間歇性地導通該升壓式轉換電路的該第一開關,使該升壓式轉換電路運作於一電流導通模式,以向該電子式變壓器汲取電流;
依據該整流信號而產生一運算值;
當該運算值為一第一數值時,設置該降壓式轉換電路的一第二開關的導通狀態,使該降壓式轉換電路將該降壓電壓信號調整為一第一電壓值;以及
當該運算值為一第二數值時,設置該降壓式轉換電路的該第二開關的導通狀態,使該降壓式轉換電路將該降壓電壓信號調整為一第二電壓值;
其中該升壓電壓信號的電位會高於該整流電壓信號的電位,並且該降壓電壓信號的電位會低於該升壓電壓信號的電位。A power converter control method for a lighting system; the lighting system includes a dimmer, an electronic transformer, a rectifier circuit, a boost converter circuit, and a buck converter circuit; the dimmer is based on an input The voltage signal generates a phase cutoff signal; the electronic transformer is coupled to the dimmer, and generates a converted voltage signal according to the phase cutoff signal; the rectifier circuit is coupled to the electronic transformer, and the converted voltage is The signal generates a rectified voltage signal; the boosting conversion circuit is coupled to the rectifying circuit, and generates a boosting voltage signal according to the rectified voltage signal; the buck converting circuit is coupled to the boosting conversion The circuit generates a step-down voltage signal according to the boost voltage signal to supply power to a low-power light-emitting device; the power converter control method includes:
When the rectified voltage signal is less than a predetermined voltage signal, setting a first switch of the boost converter circuit to be non-conducting, causing the boost converter circuit to operate in a current stop mode to suspend the electronic mode The transformer draws current;
When the rectified voltage signal is greater than the preset voltage signal, intermittently turning on the first switch of the boost converter circuit, causing the boost converter circuit to operate in a current conduction mode to capture the electronic transformer Current
Generating an operational value according to the rectified signal;
When the operation value is a first value, setting a conduction state of a second switch of the buck conversion circuit, so that the buck conversion circuit adjusts the step-down voltage signal to a first voltage value; When the operation value is a second value, setting an on state of the second switch of the buck converter circuit, so that the buck converter circuit adjusts the step-down voltage signal to a second voltage value;
The potential of the boost voltage signal is higher than the potential of the rectified voltage signal, and the potential of the buck voltage signal is lower than the potential of the boost voltage signal.
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CN111741572A (en) * | 2019-10-28 | 2020-10-02 | 华域视觉科技(上海)有限公司 | Multi-section starting method, system, medium and equipment for automobile LED boost chip |
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TW201034363A (en) * | 2009-03-13 | 2010-09-16 | Richtek Technology Corp | Buck-boost power converter and its control method |
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CN202535592U (en) * | 2012-03-01 | 2012-11-14 | 杭州乐图光电科技有限公司 | MR16LED lamp driving circuit and MR16LED lamp lighting system using the same |
CN102740571B (en) * | 2012-07-18 | 2014-10-15 | 矽力杰半导体技术(杭州)有限公司 | Dimmable LED (Light-Emitting Diode) driving circuit and driving method |
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CN111741572A (en) * | 2019-10-28 | 2020-10-02 | 华域视觉科技(上海)有限公司 | Multi-section starting method, system, medium and equipment for automobile LED boost chip |
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