TWI625985B - LED power supply device and semiconductor integrated circuit - Google Patents
LED power supply device and semiconductor integrated circuit Download PDFInfo
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Abstract
本發明係提供一種藉由削減用於將電源提供給控制LED燈亮燈的控制電路的輔助電源，從而能夠謀求裝置的小型化和降低製造成本的LED用電源裝置。LED用電源裝置的控制電路，在調光訊號指示LED燈亮燈時，將控制訊號輸出至反饋手段的控制端子，從而使LED燈的電流對應調光訊號所規定的調光率，在調光訊號指示LED燈滅燈時，將控制訊號輸出至反饋手段的控制端子，從而使第二整流平滑電路的輸出電壓成為比在調光訊號指示LED燈亮燈時從第二整流平滑電路處輸出的輸出電壓更低的預設電壓。 The present invention provides an LED power supply device capable of reducing the size of the device and reducing the manufacturing cost by reducing an auxiliary power supply for supplying power to a control circuit that controls the lighting of the LED lamp. The control circuit of the LED power supply device outputs the control signal to the control terminal of the feedback means when the dimming signal indicates that the LED light is on, so that the current of the LED lamp corresponds to the dimming rate specified by the dimming signal, and the dimming is performed. When the signal indicates that the LED light is off, the control signal is output to the control terminal of the feedback means, so that the output voltage of the second rectification and smoothing circuit becomes greater than that output from the second rectification and smoothing circuit when the dimming signal indicates that the LED light is on. Output voltage lower preset voltage.
Description
本發明關於一種LED用電源裝置、以及半導體積體電路。 The present invention relates to a power supply device for an LED and a semiconductor integrated circuit.
以往，有一種LED用電源裝置100A，其是根據調光訊號的輸入，從而對於LED燈X的調光率進行控制(圖3)。 Conventionally, there is a power supply device 100A for an LED that controls the dimming rate of the LED lamp X based on the input of a dimming signal (FIG. 3).
這樣的LED用電源裝置100A，由於在對由LED元件Xa構成的LED燈X滅燈時，是對LED的電流值進行恒電流控制，因此要將電流值控制為0A的話，就必須要停止主電源S1，並且，要進行滅燈控制的話，則需要輔助電源S2。專利文獻1中展示了其解決手段。在對LED燈X滅燈時，是基於：比被作為基準值預先設定的LED元件Xa的亮燈開始電壓更低的電壓值，與來自於對LED燈X的電壓進行檢測的檢測手段Rxa的檢測訊號之間的比較結果，從而將施加於LED元件Xa的電壓控制為比亮燈開始電壓更低的恒電壓。 In such a power supply device 100A for LED, when the LED lamp X composed of the LED element Xa is turned off, the current value of the LED is controlled by constant current. Therefore, if the current value is to be controlled to 0A, the main device must be stopped. The power source S1 and the auxiliary power source S2 are required for the light-off control. Patent Document 1 shows the solution. When the LED lamp X is turned off, it is based on a voltage value lower than the lighting start voltage of the LED element Xa set in advance as a reference value, and based on the detection means Rxa from the detection means for detecting the voltage of the LED lamp X. The comparison result between the detection signals is used to control the voltage applied to the LED element Xa to a constant voltage lower than the start-up voltage.
藉由這樣，就能夠在主電源S1輸出交流電壓的狀態下，將LED元件Xa控制為滅燈狀態。 By doing so, it is possible to control the LED element Xa to a light-off state while the main power source S1 is outputting an AC voltage.
先行技術文獻 Advance technical literature
專利文獻1：日本特開第二009-189184號 Patent Document 1: Japanese Patent Laid-Open No. 009-189184
然而，在上述以往的LED用電源裝置100A中，就需要輔助電源S2將電力藉由調節器(regulator)REG提供給控制LED燈X亮 燈的控制電路CON，從而就帶來了裝置的大型化和製造成本增加的問題。 However, in the above-mentioned conventional LED power supply device 100A, the auxiliary power source S2 is required to supply power to the LED lamp X through the regulator REG. The control circuit CON of the lamp brings about the problem of increasing the size of the device and increasing the manufacturing cost.
另外，在專利文獻1的電路中，控制電路的電源電壓在多數情況下為3.3V~15V。不過，對於LED燈來說，由於要增加LED燈串聯的數量，從而來確保亮度，因此一般輸出電壓會在50V~250V程度上。要從50V~250V的輸出中獲得3.3V~15V的電壓就需要調節器，並且會導致非常大的電力損耗、以及帶來產生熱量的問題。 In the circuit of Patent Document 1, the power supply voltage of the control circuit is usually 3.3V to 15V. However, for LED lamps, since the number of LED lamps connected in series is required to ensure brightness, the general output voltage will be in the range of 50V ~ 250V. To obtain a voltage of 3.3V to 15V from an output of 50V to 250V, a regulator is required, and it will cause a very large power loss and a problem of generating heat.
因此，本發明的目的是：提供一種藉由削減用於將電源提供給控制LED燈亮燈的控制電路的輔助電源、以及調節器，從而能夠謀求裝置的小型化和降低製造成本的LED用電源裝置。 Therefore, an object of the present invention is to provide an LED power supply capable of reducing the size of the device and reducing the manufacturing cost by reducing the auxiliary power supply and the regulator for supplying power to the control circuit that controls the lighting of the LED lamp. Device.
本發明的一種形態所涉及的LED用電源裝置，其包括：一次電路，具有一次線圈，並且根據反饋(feedback)訊號將交流電壓輸出至一次線圈；第一二次線圈，與一次線圈構成變壓器；第二二次線圈，與一次線圈和第一二次線圈一同構成變壓器；第一整流平滑電路，與第一二次線圈連接；LED燈，與第一整流平滑電路連接，並且包含一個或被串聯的複數個LED元件；電流檢測手段，被設置在第一整流平滑電路內，或是第一 整流平滑電路與LED燈之間；第二整流平滑電路，與第二二次線圈連接；反饋手段，與第二整流平滑電路連接，並且基於電流檢測手段的檢測訊號，以及第二整流平滑電路的輸出電壓，將反饋訊號輸出至一次電路；以及控制電路，藉由從第二整流平滑電路處提供的電力來驅動，並且根據：從外部調光手段處輸出的規定LED燈調光率的調光訊號、電流檢測手段的檢測訊號、以及第二整流平滑電路的輸出電壓，將用於控制反饋訊號的控制訊號輸出至反饋手段的控制端子；其中，控制電路：在調光訊號指示LED燈亮燈時，將控制訊號輸出至反饋手段的控制端子，從而使LED燈的電流對應調光訊號所規定的調光率；在調光訊號指示LED燈滅燈時，將控制訊號輸出至反饋手段的控制端子，從而使第二整流平滑電路的輸出電壓成為比在調光訊號指示LED燈亮燈時從第二整流平滑電路處輸出的輸出電壓更低的預設電壓。 A power supply device for an LED according to an aspect of the present invention includes a primary circuit having a primary coil and outputting an AC voltage to the primary coil according to a feedback signal; a first secondary coil and a primary coil forming a transformer; The second secondary coil constitutes a transformer together with the primary coil and the first secondary coil; the first rectifying and smoothing circuit is connected to the first secondary coil; the LED lamp is connected to the first rectifying and smoothing circuit and includes one or is connected in series A plurality of LED elements; the current detection means is set in the first rectifying and smoothing circuit, or the first Between the rectification smoothing circuit and the LED lamp; the second rectification smoothing circuit is connected to the second secondary coil; the feedback means is connected to the second rectification smoothing circuit, and based on the detection signal of the current detection means, and the Output voltage to output a feedback signal to a primary circuit; and a control circuit to be driven by the power provided from the second rectifying and smoothing circuit, and according to: a dimming rate of a prescribed LED lamp output from an external dimming means The signal, the detection signal of the current detection means, and the output voltage of the second rectifying and smoothing circuit output the control signal for controlling the feedback signal to the control terminal of the feedback means; wherein, the control circuit: the dimming signal indicates that the LED lights up When the control signal is output to the control terminal of the feedback means, so that the current of the LED light corresponds to the dimming rate specified by the dimming signal; when the dimming signal indicates that the LED light is off, the control signal is output to the control of the feedback means Terminal, so that the output voltage of the second rectifying and smoothing circuit becomes smaller than that from the second rectifying when the dimming signal indicator LED is on. Smoothing circuit at a lower voltage output from the output preset voltage.
較佳地，在LED燈亮燈裝置中，控制電路：在調光訊號指示LED燈亮燈時，將控制訊號輸出至反饋手段的控制端子，從而使LED燈的電流對應調光訊號所規定的調光率；在調光訊號指示LED燈滅燈時，將控制訊號輸出至反饋手段的控制端子，從而使第二整流平滑電路的輸出電壓以比在調光訊號指示LED燈亮燈時從第二整流平滑電路處輸出的輸出電壓更低的第一電壓作為上限值並且以比第一電壓更低的第二電壓作為下限值。 Preferably, in the LED lamp lighting device, the control circuit: when the dimming signal indicates that the LED lamp is on, the control signal is output to the control terminal of the feedback means, so that the current of the LED lamp corresponds to the regulation of the dimming signal. Dimming rate; when the dimming signal indicates that the LED light is off, the control signal is output to the control terminal of the feedback means, so that the output voltage of the second rectification smoothing circuit is lower than that when the dimming signal indicates that the LED light is on. A first voltage having a lower output voltage output at the two rectification smoothing circuits is used as an upper limit value and a second voltage lower than the first voltage is used as a lower limit value.
較佳地，在LED用電源裝置中，一次電路：在調光訊號指示LED燈亮燈時，根據反饋訊號將交流電壓輸出至一次線圈，從而使LED燈的電流對應調光訊號所規定的調光率；在調光訊號指示LED燈滅燈時，根據反饋訊號將交流電壓輸出至一次線圈，從而使讓LED燈滅燈且能夠用於驅動的電力被提供至控制電路。 Preferably, in the LED power supply device, a primary circuit: when the dimming signal indicates that the LED light is on, the AC voltage is output to the primary coil according to the feedback signal, so that the current of the LED light corresponds to the regulation of the dimming signal. Light rate; when the dimming signal indicates that the LED light is off, the AC voltage is output to the primary coil according to the feedback signal, so that the power that allows the LED light to go out and can be used for driving is provided to the control circuit.
較佳地，在LED用電源裝置中，控制電路包括：調光電路，輸出對應調光訊號所規定的調光率的直流電壓；運算放大器(operational amplifier)，其非反轉輸入端子處被輸入直流電壓，其反轉輸入端子與電流檢測手段相連接，並且輸出控制訊號使直流電壓與檢測訊號相等；分壓電路，將對第二整流平滑電路的輸出電壓進行分壓後的分壓電壓進行輸出；以及比較器(comparator)，具有滯後性質(hysteresis property)，其反轉輸入端子處被輸入分壓電壓，其非反轉輸入端子處被輸入預先設定的基準電壓，並且輸出基於將分壓電壓與基準電壓比較後的結果的控制訊號；其中，控制電路：在調光訊號指示LED燈亮燈時，將運算放大器輸出的控制訊號輸出至反饋手段的控制端子；在調光訊號指示LED燈滅燈時，將比較器輸出的控制訊號輸出至反饋手段的控制端子。 Preferably, in the LED power supply device, the control circuit includes: a dimming circuit that outputs a DC voltage corresponding to a dimming rate specified by a dimming signal; an operational amplifier whose input is input at a non-inverting input terminal DC voltage, whose inverting input terminal is connected to the current detection means, and outputs a control signal to make the DC voltage equal to the detection signal; a voltage divider circuit that divides the output voltage of the second rectification smoothing circuit Output; and a comparator with hysteresis property, a divided voltage is input to the inverting input terminal, a preset reference voltage is input to the non-inverting input terminal, and the output is based on the The control signal of the comparison result of the voltage and the reference voltage; among them, the control circuit: when the dimming signal indicator LED is on, the control signal output by the operational amplifier is output to the control terminal of the feedback means; the dimming signal indicates the LED When the light is off, the control signal output by the comparator is output to the control terminal of the feedback means.
較佳地，在LED用電源裝置中，控制電路進一步包括：切換電路，在：當調光訊號指示LED燈亮燈時，將運算放大器與反饋手段的控制端子導通的第一狀態，與當調光訊號指示LED燈滅燈時，將比較器與反饋手段的控制端子導通的第二狀態之間進行切換；調光電路對切換電路的運作進行控制。 Preferably, in the power supply device for LED, the control circuit further includes: a switching circuit, in a first state of turning on the operational amplifier and the control terminal of the feedback means when the dimming signal indicates that the LED light is on, When the light signal indicates that the LED lamp is off, the comparator and the second state where the control terminal of the feedback means is turned on are switched; the dimming circuit controls the operation of the switching circuit.
較佳地，在LED用電源裝置中，一次電路：在調光訊號指示LED燈滅燈時，根據反饋訊號，對輸出至一次線圈的交流電壓進行控制，使其低於LED元件的正方向電壓與LED燈整體被串聯的LED元件個數的總正方向電壓。 Preferably, in the LED power supply device, the primary circuit: when the dimming signal indicates that the LED light is off, the AC voltage output to the primary coil is controlled according to the feedback signal, so that it is lower than the positive voltage of the LED element The total positive voltage of the number of LED elements connected in series with the LED lamp.
較佳地，在LED用電源裝置中，第二二次線圈的匝數比第一二次線圈的匝數更小。 Preferably, in the LED power supply device, the number of turns of the second secondary coil is smaller than the number of turns of the first secondary coil.
較佳地，在LED用電源裝置中，反饋手段為基於檢測電流將反饋訊號進行光電耦合的光電耦合元件。 Preferably, in the power supply device for LED, the feedback means is a photoelectric coupling element that photoelectrically couples the feedback signal based on the detection current.
較佳地，在LED用電源裝置中，反饋手段為發光二極體。 Preferably, in the power supply device for LED, the feedback means is a light emitting diode.
較佳地，在LED用電源裝置中，一次電路具有：被動元件，接收反饋訊號，並且將與接收到的反饋訊號相對應的接收訊號進行輸出；一側電路根據接收訊號，將交流電壓輸出至一次線圈。 Preferably, in the power supply device for LED, the primary circuit has: a passive element that receives a feedback signal and outputs a reception signal corresponding to the received feedback signal; and a circuit on one side outputs an AC voltage to the reception signal Primary coil.
較佳地，在LED用電源裝置中，被動元件為光電二極體或光電晶體。 Preferably, in the power supply device for LED, the passive element is a photodiode or a photocrystal.
較佳地，在LED用電源裝置中，第一整流平滑電路具有：第一整流元件，其一端與第一二次線圈的另一端連接，其另一端與第一LED端子連接，並且以從第一二次線圈的另一端朝第一 LED端子的方向為正方向；第一輸出電容器(capacitor)，其一端與第一LED端子連接，其另一端與第二LED端子連接；以及電流檢測電阻，作為電流檢測手段，其一端與第二LED端子連接，其另一端與第一二次線圈的一端連接；第二整流平滑電路具有：第二整流元件，其一端與第二二次線圈的另一端連接，其另一端與電源端子連接，並且以從第二二次線圈的另一端朝電源端子的方向為正方向，以及第二輸出電容器，其一端與電源端子連接，其另一端接地。 Preferably, in the power supply device for an LED, the first rectifying and smoothing circuit includes: a first rectifying element, one end of which is connected to the other end of the first secondary coil, and the other end of which is connected to the first LED terminal, The other ends of the primary and secondary coils are facing the first The direction of the LED terminal is positive; one end of the first output capacitor (capacitor) is connected to the first LED terminal and the other end is connected to the second LED terminal; and a current detection resistor, as a current detection means, one end is connected to the second The LED terminal is connected, and the other end is connected to one end of the first secondary coil; the second rectifying and smoothing circuit has a second rectifying element, one end of which is connected to the other end of the second secondary coil, and the other end of which is connected to a power terminal, In addition, the direction from the other end of the second secondary coil to the power terminal is a positive direction, and the second output capacitor has one end connected to the power terminal and the other end grounded.
根據本發明的一種形態所相關的實施例的半導體積體電路，包括：一次電路，具有一次線圈，並且在根據反饋訊號將交流電壓輸出至一次線圈；第一二次線圈，與一次線圈構成變壓器；第二二次線圈，與一次線圈和第一二次線圈一同構成變壓器；第一整流平滑電路，與第一二次線圈連接；LED燈，與第一整流平滑電路連接，並且包含一個或被串聯的複數個LED元件；電流檢測手段，被設置在第一整流平滑電路內，或是第一整流平滑電路與LED燈之間；第二整流平滑電路，與第二二次線圈連接；以及反饋手段，與第二整流平滑電路連接，並且基於電流檢測手段的檢測訊號，以及第二整流平滑電路的輸出電壓，將反饋訊號輸出至一次電路；其中，半導體積體電路：藉由從第二整流平滑電路處提供的電力來驅動，並且根據：從外部調光手段處輸出的規定LED燈調光率的調光訊號、電流檢測 手段的檢測訊號、以及第二整流平滑電路的輸出電壓，將用於控制反饋訊號的控制訊號輸出至反饋手段的控制端子； 在調光訊號指示LED燈亮燈時，將控制訊號輸出至反饋手段的控制端子，從而使LED燈的電流對應調光訊號所規定的調光率； 在調光訊號指示LED燈滅燈時，將控制訊號輸出至反饋手段的控制端子，從而使第二整流平滑電路的輸出電壓成為比在調光訊號指示LED燈亮燈時從第二整流平滑電路處輸出的輸出電壓更低的預設電壓。 A semiconductor integrated circuit according to an embodiment of the present invention includes a primary circuit having a primary coil and outputting an AC voltage to the primary coil according to a feedback signal; a first secondary coil and a primary coil forming a transformer. ; The second secondary coil, together with the primary coil and the first secondary coil, constitute a transformer; the first rectifying and smoothing circuit is connected to the first secondary coil; the LED lamp is connected to the first rectifying and smoothing circuit, and contains one or A plurality of LED elements connected in series; a current detection means is provided in the first rectification smoothing circuit or between the first rectification smoothing circuit and the LED lamp; the second rectification smoothing circuit is connected to the second secondary coil; and feedback Means, is connected to the second rectifying and smoothing circuit, and outputs a feedback signal to the primary circuit based on the detection signal of the current detection means and the output voltage of the second rectifying and smoothing circuit; wherein the semiconductor integrated circuit: Driven by the power provided by the smoothing circuit, and adjusted according to the prescribed LED light output from an external dimming means Dimming signal rate, the current detection The detection signal of the means and the output voltage of the second rectifying and smoothing circuit output the control signal for controlling the feedback signal to the control terminal of the feedback means; When the dimming signal indicates that the LED light is on, the control signal is output to the control terminal of the feedback means, so that the current of the LED light corresponds to the dimming rate specified by the dimming signal; When the dimming signal indicates that the LED light is off, the control signal is output to the control terminal of the feedback means, so that the output voltage of the second rectification and smoothing circuit becomes greater than that from the second rectification and smoothing circuit when the dimming signal indicates that the LED light is on. The output voltage is lower than the preset voltage.
本發明的一種形態所相關的LED用電源裝置，包括：一次電路，具有一次線圈，並且在根據反饋訊號將交流電壓輸出至一次線圈；第一二次線圈，與一次線圈構成變壓器；第二二次線圈，與一次線圈和第一二次線圈一同構成變壓器；第一整流平滑電路，與第一二次線圈連接；LED燈，與第一整流平滑電路連接，並且包含一個或被串聯的複數個LED元件；電流檢測手段，被設置在第一整流平滑電路內，或是第一整流平滑電路與LED燈之間；第二整流平滑電路，與第二二次線圈連接；反饋手段，與第二整流平滑電路連接，並且基於電流檢測手段的檢測訊號，以及第二整流平滑電路的輸出電壓，將反饋訊號輸出至一次電路；以及控制電路，藉由從第二整流平滑電路處提供的電力來驅動，並且根據：從外部調光手段處輸出的規定LED燈調光率的調光訊號、電流檢測手段的檢測訊號、以及第二整流平滑電路的輸出電壓，將用於控制反饋訊號的控制訊號輸出至反饋手段的控制端子。 A power supply device for an LED according to one aspect of the present invention includes a primary circuit having a primary coil and outputting an AC voltage to the primary coil according to a feedback signal; a first secondary coil and a primary coil forming a transformer; and a second secondary The secondary coil constitutes a transformer together with the primary coil and the first secondary coil; the first rectifying and smoothing circuit is connected to the first secondary coil; the LED lamp is connected to the first rectifying and smoothing circuit and includes one or a plurality of serially connected LED element; current detection means is set in the first rectification smoothing circuit or between the first rectification smoothing circuit and the LED lamp; the second rectification smoothing circuit is connected to the second secondary coil; the feedback means is connected to the second The rectifying and smoothing circuit is connected and outputs a feedback signal to the primary circuit based on the detection signal of the current detection means and the output voltage of the second rectifying and smoothing circuit; and the control circuit is driven by the power provided from the second rectifying and smoothing circuit. , And according to: the dimming signal and current detection hand of the prescribed LED lamp dimming rate output from the external dimming means A detection signal, and the output voltage of the second rectifying smoothing circuit, for controlling the feedback control signal to the feedback control signal output terminal means.
特別是，控制電路在調光訊號指示LED燈亮燈時，將控制訊號輸出至反饋手段的控制端子，從而使LED燈的電流對應調光訊號所 規定的調光率，在調光訊號指示LED燈滅燈時，將控制訊號輸出至反饋手段的控制端子，從而使第二整流平滑電路的輸出電壓成為比在調光訊號指示LED燈亮燈時從第二整流平滑電路處輸出的輸出電壓更低的預設電壓。 In particular, when the dimming signal indicates that the LED light is on, the control circuit outputs the control signal to the control terminal of the feedback means, so that the current of the LED light corresponds to that of the dimming signal. The prescribed dimming rate outputs the control signal to the control terminal of the feedback means when the dimming signal indicates that the LED light is off, so that the output voltage of the second rectifying and smoothing circuit becomes higher than that when the dimming signal indicates that the LED light is on The output voltage output from the second rectifying and smoothing circuit is a lower preset voltage.
藉由這樣，在調光訊號指示LED燈亮燈時，恒定電流就被從一次電路藉由第一二次線圈提供至LED燈從而使LED燈亮燈，同時，用於驅動的電源電壓則藉由第二二次線圈被提供至控制電路。 In this way, when the dimming signal indicates that the LED light is on, a constant current is supplied from the primary circuit to the LED light through the first and second coils to light the LED light. The second secondary coil is provided to the control circuit.
另一方面，在調光訊號指示LED燈滅燈時，則從一次電路提供用於使LED燈滅燈且能夠用於驅動的電力至控制電路。 On the other hand, when the dimming signal indicates that the LED lamp is off, power from the primary circuit is provided to the control circuit for turning off the LED lamp and can be used for driving.
這樣，本發明的一種形態所相關的LED用電源裝置，就能夠藉由削減用於將電源提供給控制LED燈亮燈的控制電路的輔助電源，從而謀求裝置的小型化和降低製造成本。 In this way, the LED power supply device according to one aspect of the present invention can reduce the size of the device and reduce the manufacturing cost by reducing the auxiliary power supply for supplying power to the control circuit that controls the lighting of the LED lamp.
100‧‧‧LED用電源裝置 100‧‧‧LED Power Supply Unit
100A‧‧‧LED用電源裝置 100A‧‧‧LED Power Supply Unit
A1‧‧‧第一整流平滑電路 A1‧‧‧The first rectifying and smoothing circuit
A2‧‧‧第二整流平滑電路 A2‧‧‧Second Rectification Smoothing Circuit
AC‧‧‧調光電路 AC‧‧‧Dimming circuit
AS‧‧‧調光訊號 AS‧‧‧Dimming signal
B‧‧‧基準電源 B‧‧‧ Reference Power
C‧‧‧放大器用電容器 C‧‧‧ capacitor for amplifier
C1‧‧‧第一輸出電容器 C1‧‧‧first output capacitor
C2‧‧‧第二輸出電容器 C2‧‧‧Second output capacitor
COMP‧‧‧比較器 COMP‧‧‧ Comparator
CON‧‧‧控制電路 CON‧‧‧ control circuit
D1‧‧‧第一整流元件 D1‧‧‧First rectifying element
D2‧‧‧第二整流元件 D2‧‧‧Second rectifying element
FBS‧‧‧反饋訊號 FBS‧‧‧Feedback
FC1‧‧‧一次電路 FC1‧‧‧ primary circuit
ILED‧‧‧電流 ILED‧‧‧Current
L1‧‧‧一次線圈 L1‧‧‧ primary coil
L2a‧‧‧第一二次線圈 L2a‧‧‧First secondary coil
L2b‧‧‧第二二次線圈 L2b‧‧‧Secondary secondary coil
OPA‧‧‧運算放大器 OPA‧‧‧ Operational Amplifier
R‧‧‧控制電阻 R‧‧‧Control resistor
RD‧‧‧分壓電路 RD‧‧‧Voltage Dividing Circuit
RD1‧‧‧第一分壓電阻 RD1‧‧‧The first voltage dividing resistor
RD2‧‧‧第二分壓電阻 RD2‧‧‧Second Voltage Divider
REG‧‧‧調節器 REG‧‧‧ Regulator
RX‧‧‧電流檢測手段 RX‧‧‧Current detection means
Rxa‧‧‧檢測手段 Rxa‧‧‧ Detection Means
S‧‧‧交流電源 S‧‧‧AC Power
S1‧‧‧主電源 S1‧‧‧Main Power
S2‧‧‧輔助電源 S2‧‧‧Auxiliary Power
SC‧‧‧控制訊號 SC‧‧‧Control signal
SRX‧‧‧檢測訊號 SRX‧‧‧ Detection signal
SW‧‧‧切換電路 SW‧‧‧Switching circuit
SX‧‧‧內部電源 SX‧‧‧ Internal Power
TGND‧‧‧接地端子 TGND‧‧‧ ground terminal
TIN‧‧‧輸入端子 TIN‧‧‧Input terminal
TOP‧‧‧訊號端子 TOP‧‧‧Signal terminal
TOUT‧‧‧訊號端子 TOUT‧‧‧Signal terminal
TS‧‧‧電源端子 TS‧‧‧Power Terminal
TX1‧‧‧第一LED端子 TX1‧‧‧First LED terminal
TX2‧‧‧第二LED端子 TX2‧‧‧Second LED terminal
TYA‧‧‧控制端子 TYA‧‧‧Control terminal
VA‧‧‧直流電壓 VA‧‧‧DC voltage
VB‧‧‧基準電壓 VB‧‧‧ Reference Voltage
VC‧‧‧輸出電壓 VC‧‧‧Output voltage
VD‧‧‧分壓電壓 VD‧‧‧ divided voltage
VLED‧‧‧電壓 VLED‧‧‧Voltage
Vth1‧‧‧第一電壓 Vth1‧‧‧first voltage
Vth2‧‧‧第二電壓 Vth2‧‧‧Second voltage
X‧‧‧LED燈 X‧‧‧LED Light
Xa‧‧‧LED元件 Xa‧‧‧LED components
YA‧‧‧反饋手段 YA‧‧‧Feedback
YB‧‧‧被動元件 YB‧‧‧Passive
Z‧‧‧變壓器 Z‧‧‧Transformer
圖1是展示本發明之第一實施方式所相關的LED用電源裝置100的一例的構成示意圖。 FIG. 1 is a schematic diagram showing an example of an LED power supply device 100 according to the first embodiment of the present invention.
圖2是展示圖1所示的第一實施方式所相關的LED用電源裝置100中在LED亮燈與LED滅燈之間進行切換的運作波形的一例的波形圖。 FIG. 2 is a waveform diagram showing an example of an operation waveform for switching between LED on and LED off in the LED power supply device 100 according to the first embodiment shown in FIG. 1.
圖3是展示習知的LED用電源裝置100A的一例的構成示意圖。 FIG. 3 is a schematic configuration diagram showing an example of a conventional LED power supply device 100A.
以下，將基於圖式對本發明相關的實施方式進行說明。 Hereinafter, embodiments related to the present invention will be described based on the drawings.
第一實施方式 First embodiment
圖1是展示第一實施方式所相關的LED用電源裝置100的一例的構成示意圖。 FIG. 1 is a schematic diagram showing an example of an LED power supply device 100 according to the first embodiment.
如圖1所示，實施方式所相關的LED用電源裝置100，例如，包括：一次電路FC1、LED燈X、第一LED端子TX1、第二LED端子TX2、第一二次線圈L2a、第二二次線圈L2b、第一整流平滑電路A1、第二整流平滑電路A2、電流檢測手段RX、反饋手段YA、放大器用電容器C、控制電阻R、以及控制電路(半導體積體電路)CON。 As shown in FIG. 1, the LED power supply device 100 according to the embodiment includes, for example, a primary circuit FC1, an LED lamp X, a first LED terminal TX1, a second LED terminal TX2, a first secondary coil L2a, and a second The secondary coil L2b, the first rectification smoothing circuit A1, the second rectification smoothing circuit A2, the current detection means RX, the feedback means YA, the amplifier capacitor C, the control resistor R, and the control circuit (semiconductor integrated circuit) CON.
第一LED端子TX1處，連接有包含一個或被串聯的複數個LED元件Xa的LED燈X的正極側。 The first LED terminal TX1 is connected to a positive side of an LED lamp X including one or a plurality of LED elements Xa connected in series.
第二LED端子TX2處，連接有LED燈X的負極側。 The second LED terminal TX2 is connected to the negative side of the LED lamp X.
另外，第一二次線圈L2a與一次線圈L1與第二二次線圈L2b一同構成變壓器Z。 The first secondary coil L2a together with the primary coil L1 and the second secondary coil L2b constitute a transformer Z.
LED燈X包含一個或被串聯的複數個LED元件Xa。 The LED lamp X includes one or a plurality of LED elements Xa connected in series.
一次電路FC1具有一次線圈L1和交流電源S。該一次電路FC1根據反饋訊號FBS，將由交流電源S產生的交流電壓輸出至一次線圈L1。 The primary circuit FC1 includes a primary coil L1 and an AC power source S. The primary circuit FC1 outputs the AC voltage generated by the AC power source S to the primary coil L1 according to the feedback signal FBS.
具體來說，如圖1所示，該一次電路FC1具有：接收反饋訊號FBS，並將與接收到的反饋訊號FBS相對應的接收訊號進行輸出的被動元件YB。該一次電路FC1根據該接收訊號，將交流電壓輸出至一次線圈L1。另外，上述被動元件YB例如為光電二極體或光電晶體。 Specifically, as shown in FIG. 1, the primary circuit FC1 includes a passive element YB that receives a feedback signal FBS and outputs a reception signal corresponding to the received feedback signal FBS. The primary circuit FC1 outputs an AC voltage to the primary coil L1 according to the received signal. The passive element YB is, for example, a photodiode or a photocrystal.
而且，例如，一次電路FC1在反饋訊號FBS指示LED燈X亮燈時，根據反饋訊號FBS將交流電壓輸出至一次線圈L1從而使能 夠亮燈的恒定電流流通至LED燈X。 Moreover, for example, when the feedback signal FBS indicates that the LED X is turned on, the primary circuit FC1 outputs an AC voltage to the primary coil L1 according to the feedback signal FBS to enable A constant current sufficient to illuminate flows to the LED lamp X.
換言之，一次電路FC1在反饋訊號FBS指示LED燈X亮燈時，根據反饋訊號FBS將交流電壓輸出至一次線圈L1從而使LED燈X的電流對應調光訊號AS所規定的調光率。 In other words, when the feedback signal FBS indicates that the LED lamp X is on, the primary circuit FC1 outputs an AC voltage to the primary coil L1 according to the feedback signal FBS so that the current of the LED lamp X corresponds to the dimming rate specified by the dimming signal AS.
另一方面，一次電路FC1在反饋訊號FBS指示LED燈X滅燈時，將交流電壓輸出至一次線圈L1從而使LED燈X滅燈並且控制電路CON處被提供能夠用於驅動的電力。 On the other hand, when the feedback signal FBS indicates that the LED lamp X is off, the primary circuit FC1 outputs an AC voltage to the primary coil L1 so that the LED lamp X is off and the control circuit CON is provided with power that can be used for driving.
換言之，一次電路FC1在調光訊號AS指示LED燈X滅燈時，根據反饋訊號FBS將交流電壓輸出至一次線圈L1從而使LED燈X滅燈並且控制電路CON處被提供能夠用於驅動的電力。 In other words, when the dimming signal AS indicates that the LED lamp X is off, the primary circuit FC1 outputs an AC voltage to the primary coil L1 according to the feedback signal FBS so that the LED lamp X is off and the control circuit CON is provided with power that can be used for driving .
更加具體地來說，一次電路FC1在調光訊號AS指示LED燈X滅燈時，根據反饋訊號FBS，對輸出至一次線圈L1的交流電壓進行控制從而使其低於LED元件Xa的正方向電壓與LED燈X整體被串聯的LED元件Xa個數的總正方向電壓。 More specifically, when the dimming signal AS indicates that the LED lamp X goes out, the primary circuit FC1 controls the AC voltage output to the primary coil L1 so that it is lower than the positive voltage of the LED element Xa according to the feedback signal FBS. Total positive direction voltage of the number of LED elements Xa connected in series with the LED lamp X as a whole.
另外，第一整流平滑電路A1例如圖1所示，與第一二次線圈L2a連接。該第一整流平滑電路A1對第一二次線圈L2a的感應電壓進行整流後，藉由第一LED端子TX1、第二LED端子TX2，提供至LED燈X。 The first rectifying and smoothing circuit A1 is connected to the first secondary coil L2a, as shown in FIG. 1, for example. The first rectifying and smoothing circuit A1 rectifies the induced voltage of the first secondary coil L2a and provides it to the LED lamp X through the first LED terminal TX1 and the second LED terminal TX2.
該第一整流平滑電路A1例如圖1所示，具有：第一整流元件(二極體)D1、第一輸出電容器C1、以及電流檢測手段RX。 The first rectifying and smoothing circuit A1 includes, for example, a first rectifying element (diode) D1, a first output capacitor C1, and a current detection means RX, as shown in FIG. 1.
第一整流元件D1例如圖1所示，為：一端(正極)與第一二次線圈L2a的另一端連接，另一端(負極)與第一LED端子TX1連接的，並且以從第一二次線圈L2a的另一端朝第一LED端子TX1的 方向為正方向的二極體。 The first rectifying element D1 is, for example, as shown in FIG. 1. One end (positive end) is connected to the other end of the first secondary coil L2a, and the other end (negative end) is connected to the first LED terminal TX1. The other end of the coil L2a faces the first LED terminal TX1. A diode with a positive direction.
第一輸出電容器C1的一端與第一LED端子TX1連接，另一端與第二LED端子TX2連接。 One end of the first output capacitor C1 is connected to the first LED terminal TX1, and the other end is connected to the second LED terminal TX2.
另外，如已述般，第二二次線圈L2b與一次線圈L1和第一二次線圈L2a一同構成變壓器Z。 As described above, the second secondary coil L2b together with the primary coil L1 and the first secondary coil L2a constitutes the transformer Z.
該第二二次線圈L2b的感應電勢被設定為比第一二次線圈L2a的感應電勢更小。 The induced potential of the second secondary coil L2b is set to be smaller than the induced potential of the first secondary coil L2a.
第二二次線圈L2b的匝數被設定為比第一二次線圈L2a的匝數更小。 The number of turns of the second secondary coil L2b is set to be smaller than the number of turns of the first secondary coil L2a.
另外，電流檢測手段RX例如圖1所示，為：一端與第二LED端子TX2連接，其另一端與第一二次線圈L2a的一端連接的電流檢測電阻。其在該圖1所示例中，被設置在第一整流平滑電路A1內。但是，該電流檢測手段RX也可以被設置在第一整流平滑電路A1的輸出與LED燈X之間。 In addition, as shown in FIG. 1, the current detection means RX is a current detection resistor having one end connected to the second LED terminal TX2 and the other end connected to one end of the first secondary coil L2 a. In the example shown in FIG. 1, this is provided in the first rectifying and smoothing circuit A1. However, the current detection means RX may be provided between the output of the first rectifying and smoothing circuit A1 and the LED lamp X.
該電流檢測手段RX輸出與在其一段流通的電流相對應的檢測訊號SRX。 This current detection means RX outputs a detection signal SRX corresponding to the current flowing through the section.
另外，第二整流平滑電路A2與第二二次線圈L2b連接。 該第二整流平滑電路A2將對第二二次線圈L2b的感應電壓進行整流後的輸出電壓VC，藉由電源端子TS，提供至控制電路CON。 The second rectifying and smoothing circuit A2 is connected to the second secondary coil L2b. The second rectifying and smoothing circuit A2 will rectify the output voltage VC of the induced voltage of the second secondary coil L2b through the power terminal TS to the control circuit CON.
該第二整流平滑電路A2例如圖1所示，具有：第二整流元件D2、以及第二輸出電容器C2。 The second rectifying and smoothing circuit A2 includes, for example, a second rectifying element D2 and a second output capacitor C2 as shown in FIG. 1.
第二整流元件D2例如圖1所示，為：一端(正極)與第二二次線圈L2b的另一端連接，另一端(負極)與電源端子TS連接的， 並且以從第二二次線圈L2b的另一端朝電源端子TS的方向為正方向的二極體。 The second rectifying element D2 is, for example, as shown in FIG. 1: one end (positive end) is connected to the other end of the second secondary coil L2b, and the other end (negative end) is connected to the power terminal TS. In addition, a diode in a direction from the other end of the second secondary coil L2b toward the power supply terminal TS is a positive direction.
第二輸出電容器C2例如圖1所示，其一端與電源端子TS連接，其另一端接地(與接地端子TGND連接)。 As shown in FIG. 1 for example, the second output capacitor C2 has one end connected to the power supply terminal TS and the other end connected to the ground (connected to the ground terminal TGND).
另外，反饋手段YA與第二整流平滑電路A2的輸出相連接。 In addition, the feedback means YA is connected to the output of the second rectifying and smoothing circuit A2.
更具體地來說，反饋手段YA例如圖1所示，連接於電源端子VC(第二整流平滑電路A2的輸出)與訊號端子TOUT之間。該反饋手段YA基於流通的電流將反饋訊號FBS輸出至一次電路FC1。 More specifically, the feedback means YA is connected between the power supply terminal VC (the output of the second rectifying and smoothing circuit A2) and the signal terminal TOUT, as shown in FIG. 1, for example. This feedback means YA outputs a feedback signal FBS to the primary circuit FC1 based on the circulating current.
即，反饋手段YA基於電流檢測手段RX的檢測訊號SRX、以及第二整流平滑電路A2的輸出電壓VC(如後述般，基於控制電路CON藉由訊號端子TOUT輸出的控制訊號)，將反饋訊號FBS輸出至一次電路FC1。 That is, the feedback means YA converts the feedback signal FBS based on the detection signal SRX of the current detection means RX and the output voltage VC of the second rectification smoothing circuit A2 (as described later, based on the control signal output by the control circuit CON through the signal terminal TOUT) Output to primary circuit FC1.
該反饋手段YA為基於電流檢測手段RX的檢測訊號SRX、以及第二整流平滑電路A2的輸出電壓VC，將反饋訊號FBS進行光電耦合的光電耦合元件。具體來講，反饋手段YA例如圖1所示，為：正極與電源端子TS連接，負極與訊號端子TOUT(藉由後述的放大器用電容器C與電流檢測手段RX的一端)連接的發光二極體。 The feedback means YA is a photo-coupling element which photoelectrically couples the feedback signal FBS based on the detection signal SRX of the current detection means RX and the output voltage VC of the second rectification smoothing circuit A2. Specifically, as shown in FIG. 1, the feedback means YA is a light-emitting diode in which a positive electrode is connected to the power supply terminal TS, and a negative electrode is connected to the signal terminal TOUT (the capacitor C for the amplifier described later is connected to one end of the current detection means RX). .
該發光二極體的負極對應控制端子TYA。藉由該控制端子TYA處被提供控制訊號SC，從而流通該發光二極體的電流會發生變化。 即，如後述般，控制電路CON藉由對控制端子TYA提供控制訊號，從而反饋訊號FBS得以被控制。 The negative electrode of the light-emitting diode corresponds to the control terminal TYA. The control signal SC is provided at the control terminal TYA, so that the current flowing through the light emitting diode will change. That is, as described later, the control circuit CON provides a control signal to the control terminal TYA, so that the feedback signal FBS can be controlled.
放大器用電容器C連接於控制端子TYA(訊號端子TOUT) 與運算放大器OPA的反轉輸入端子(訊號端子TOP)之間。 Amplifier capacitor C is connected to control terminal TYA (signal terminal TOUT) And the inverting input terminal (signal terminal TOP) of the operational amplifier OPA.
控制電阻R連接於電源端子TS(第二整流平滑電路A2的輸出)與反饋手段YA(發光二極體的正極)之間。 The control resistor R is connected between the power supply terminal TS (the output of the second rectifying and smoothing circuit A2) and the feedback means YA (the positive electrode of the light emitting diode).
控制電路CON是由來自於第二整流平滑電路A2的並藉由電源端子TS提供的電力(輸出電壓VC)來驅動的。 The control circuit CON is driven by power (output voltage VC) from the second rectifying and smoothing circuit A2 and provided by the power supply terminal TS.
該控制電路CON為：從外部調光手段(未圖示)輸出的規定LED燈X調光率的調光訊號AS藉由輸入端子TIN提供，電流檢測手段RX的檢測訊號SRX藉由訊號端子TOP提供，第二整流平滑電路A2的輸出電壓(電源電壓)VC藉由電源端子TS提供。 The control circuit CON is: a dimming signal AS outputted from an external dimming means (not shown) that specifies the dimming rate of the LED lamp X is provided through the input terminal TIN, and a detection signal SRX by the current detection means RX is provided through the signal terminal TOP It is provided that the output voltage (power supply voltage) VC of the second rectifying and smoothing circuit A2 is provided through the power supply terminal TS.
該控制電路CON根據調光訊號AS、檢測訊號SRX、以及輸出電壓VC，藉由訊號端子TOUT，將用於控制反饋訊號FBS的控制訊號SC輸出至反饋手段YA的控制端子TYA。 The control circuit CON outputs the control signal SC for controlling the feedback signal FBS to the control terminal TYA of the feedback means YA through the signal terminal TOUT according to the dimming signal AS, the detection signal SRX, and the output voltage VC.
例如，控制電路CON在調光訊號AS指示LED燈X亮燈時，將控制訊號輸出至反饋手段YA的控制端子(負極)TYA，從而使LED燈X的電流對應調光訊號AS所規定的調光率。 For example, the control circuit CON outputs the control signal to the control terminal (negative electrode) TYA of the feedback means YA when the dimming signal AS indicates that the LED lamp X is on, so that the current of the LED lamp X corresponds to the dimming signal prescribed by the dimming signal AS. Photometric.
並且，反饋手段YA將指示LED燈X亮燈的反饋訊號FBS輸出至一次電路FC1。 In addition, the feedback means YA outputs a feedback signal FBS indicating that the LED lamp X is turned on to the primary circuit FC1.
藉由這樣，在調光訊號AS指示LED燈X亮燈時，恒定電流就被從一次電路FC1藉由第一二次線圈L2a提供至LED燈X從而使LED燈X亮燈，同時，用於驅動的電源電壓則藉由第二二次線圈L2b被提供至控制電路CON。 In this way, when the dimming signal AS indicates that the LED lamp X is turned on, a constant current is supplied from the primary circuit FC1 to the LED lamp X through the first secondary coil L2a so that the LED lamp X is turned on. The driving power supply voltage is supplied to the control circuit CON through the second secondary coil L2b.
另一方面，控制電路CON在調光訊號AS指示LED燈X滅燈時，將控制訊號輸出至反饋手段YA，從而使第二整流平滑電路A2 的輸出電壓VC成為比在調光訊號AS指示LED燈X亮燈時從第二整流平滑電路A2處輸出的輸出電壓更低的預設電壓。 On the other hand, when the dimming signal AS indicates that the LED lamp X is off, the control circuit CON outputs the control signal to the feedback means YA, so that the second rectifying and smoothing circuit A2 The output voltage VC becomes a preset voltage lower than the output voltage output from the second rectifying and smoothing circuit A2 when the dimming signal AS indicator LED X is turned on.
具體來說，控制電路CON在調光訊號AS指示LED燈X滅燈時，將控制訊號輸出至反饋手段YA的控制端子TYA，從而使第二整流平滑電路A2的輸出電壓以比在調光訊號AS指示LED燈X亮燈時從第二整流平滑電路A2處輸出的輸出電壓更低的第一電壓Vth1作為上限值並且以比第一電壓Vth1更低的第二電壓Vth2作為下限值。 Specifically, when the dimming signal AS indicates that the LED light X is off, the control circuit CON outputs the control signal to the control terminal TYA of the feedback means YA, so that the output voltage of the second rectifying and smoothing circuit A2 is greater than that in the dimming signal. The AS indicates that the first voltage Vth1 having a lower output voltage output from the second rectifying and smoothing circuit A2 when the LED lamp X is on is used as the upper limit value and the second voltage Vth2 which is lower than the first voltage Vth1 is used as the lower limit value.
並且，反饋手段YA將指示LED燈X滅燈的反饋訊號FBS進行輸出。 In addition, the feedback means YA outputs a feedback signal FBS indicating that the LED lamp X is off.
如已述般，一次電路FC1根據該指示LED燈X滅燈的反饋訊號FBS，對輸出至一次線圈L1的交流電壓進行控制，從而使其不滿將LED元件Xa的正方向電壓與LED燈X的LED元件Xa的階數進行積分後的電壓(滅燈)。 As already mentioned, the primary circuit FC1 controls the AC voltage output to the primary coil L1 according to the feedback signal FBS indicating that the LED lamp X goes out, so as to make it dissatisfied with the positive direction voltage of the LED element Xa and the The integrated voltage (light-off) of the order of the LED element Xa.
進一步地，在LED燈X滅燈時，第二整流平滑電路A2的輸出電壓被控制(電壓波紋控制)為：以比在調光訊號AS指示LED燈X亮燈時從第二整流平滑電路A2處輸出的輸出電壓更低的第一電壓Vth1作為上限值並且以比第一電壓Vth1更低的第二電壓Vth2作為下限值。 Further, when the LED lamp X is turned off, the output voltage of the second rectifying and smoothing circuit A2 is controlled (voltage ripple control) as follows: from the second rectifying and smoothing circuit A2 when the dimming signal AS indicates that the LED lamp X is on. The first voltage Vth1 having a lower output voltage is used as the upper limit value and the second voltage Vth2 lower than the first voltage Vth1 is used as the lower limit value.
因此，在LED燈X滅燈時，被控制在第一電壓Vth1與第二電壓Vth2之間的輸出電壓VC就被提供至控制電路CON。即，在調光訊號AS指示LED燈X滅燈時，使LED燈X滅燈且能夠用於驅動的電力就被從一次電路FC1提供至控制電路CON。 Therefore, when the LED lamp X is turned off, the output voltage VC controlled between the first voltage Vth1 and the second voltage Vth2 is supplied to the control circuit CON. That is, when the dimming signal AS instructs the LED lamp X to go out, the electric power that causes the LED lamp X to go out and can be used for driving is supplied from the primary circuit FC1 to the control circuit CON.
這樣，控制LED燈X亮燈的控制電路CON中就不再需要用於提供電源的輔助電源。 In this way, the control circuit CON that controls the lighting of the LED lamp X no longer needs an auxiliary power supply for supplying power.
此處，控制電路CON例如圖1所示，包括：調光電路AC、運算放大器OPA、比較器COMP、分壓電路RD、切換電路SW、以及內部電源SX。 Here, the control circuit CON includes, for example, a dimming circuit AC, an operational amplifier OPA, a comparator COMP, a voltage dividing circuit RD, a switching circuit SW, and an internal power source SX, as shown in FIG. 1.
調光電路AC將對應調光訊號AS所規定的調光率的直流電壓進行輸出。 The dimming circuit AC outputs a DC voltage corresponding to the dimming rate specified by the dimming signal AS.
運算放大器OPA的非反轉輸入端子處被輸入直流電壓，反轉輸入端子則與電流檢測手段RX相連接，並且被輸入檢測訊號SRX。 該運算放大器OPA將控制訊號藉由切換電路SW以及訊號端子TOUT輸出至控制端子TYA，從而使該直流電壓VA與檢測訊號SRX的平均值相等。 A DC voltage is input to the non-inverting input terminal of the operational amplifier OPA, and the inverting input terminal is connected to the current detection means RX, and a detection signal SRX is input. The operational amplifier OPA outputs the control signal to the control terminal TYA through the switching circuit SW and the signal terminal TOUT, so that the DC voltage VA is equal to the average value of the detection signal SRX.
分壓電路RD則輸出將第二整流平滑電路A2輸出的輸出電壓(電源電壓)VC分壓後的分壓電壓VD。該分壓電路RD例如圖1所示，其一端與電源端子TS連接，其另一端接地(與接地端子TGND連接)，並輸出將輸出電壓VC分壓後的分壓電壓。 The voltage dividing circuit RD outputs a divided voltage VD obtained by dividing the output voltage (power supply voltage) VC output from the second rectifying and smoothing circuit A2. The voltage dividing circuit RD is, for example, as shown in FIG. 1. One end of the voltage dividing circuit RD is connected to the power terminal TS, and the other end is grounded (connected to the ground terminal TGND), and outputs a divided voltage that divides the output voltage VC.
該分壓電路RD例如圖1所示，包括：第一分壓電阻RD1，其一端藉由電源端子TS與第二整流平滑電路A2的輸出相連接；以及第二分壓電阻RD2，其一端與第一分壓電阻RD1的另一端連接，其另一端與接地端子TGND連接。 The voltage dividing circuit RD, for example, as shown in FIG. 1, includes: a first voltage dividing resistor RD1, one end of which is connected to the output of the second rectifying and smoothing circuit A2 through a power terminal TS; and a second voltage dividing resistor RD2, one end of which It is connected to the other end of the first voltage dividing resistor RD1, and the other end thereof is connected to the ground terminal TGND.
該分壓電路RD將第一分壓電阻RD1的另一端與第二分壓電阻RD2的一端之間的電壓作為分壓電壓VD進行輸出。 The voltage dividing circuit RD outputs a voltage between the other end of the first voltage dividing resistor RD1 and one end of the second voltage dividing resistor RD2 as a voltage dividing voltage VD.
比較器COMP的反轉輸入端子處被輸入分壓電壓VD，非反轉輸入端子處被輸入預先設定的基準電壓VB，並且輸出基於將分壓電壓VD與基準電壓VB比較後的結果的控制訊號(電壓)。該比較器COMP具有滯後性質。 The divided voltage VD is input to the inverting input terminal of the comparator COMP, and a preset reference voltage VB is input to the non-inverting input terminal, and a control signal based on the result of comparing the divided voltage VD with the reference voltage VB is output. (Voltage). The comparator COMP has a hysteresis property.
再有，例如圖1所示，基準電壓VB由基準電源B輸出。 Note that, for example, as shown in FIG. 1, the reference voltage VB is output from the reference power source B.
切換電路SW在：當調光訊號AS指示LED燈X亮燈時，將運算放大器的輸出與反饋手段YA的控制端子之TYA(訊號端子TOUT)導通的第一狀態，與當調光訊號指示LED燈滅燈時，將比較器與反饋手段的控制端子導通的第二狀態之間進行切換。 The switching circuit SW is in the first state of turning on the output of the operational amplifier and the control terminal TYA (signal terminal TOUT) of the feedback means YA when the dimming signal AS indicates that the LED X is on, and when the dimming signal indicates LED When the light is off, the comparator and the control terminal of the feedback means are switched to the second state.
調光電路AC根據調光訊號AS，對切換電路SW的運作(在第一狀態與第二狀態間進行切換)進行控制。 The dimming circuit AC controls the operation (switching between the first state and the second state) of the switching circuit SW according to the dimming signal AS.
即，控制電路CON在已述的切換電路SW為第一狀態時，將運算放大器OPA輸出的控制訊號輸出至控制端子TYA。 That is, the control circuit CON outputs a control signal output from the operational amplifier OPA to the control terminal TYA when the switching circuit SW described above is in the first state.
像這樣，控制電路CON在調光訊號AS指示LED燈X亮燈時，將運算放大器OPA輸出的控制訊號，藉由訊號端子TOUT輸出至反饋手段YA的控制端子TYA。 As such, when the dimming signal AS indicates that the LED X is on, the control circuit CON outputs the control signal output by the operational amplifier OPA to the control terminal TYA of the feedback means YA through the signal terminal TOUT.
即，控制電路CON將控制訊號SC輸出至反饋手段YA的控制端子(負極)TYA，從而使LED燈的電流對應調光訊號AS所規定的調光率。 That is, the control circuit CON outputs the control signal SC to the control terminal (negative electrode) TYA of the feedback means YA, so that the current of the LED lamp corresponds to the dimming rate prescribed by the dimming signal AS.
另一方面，控制電路CON在已述的切換電路SW為第二狀態時，將比較器COMP輸出的電壓輸出至控制端子TYA。 On the other hand, when the switching circuit SW described above is in the second state, the control circuit CON outputs the voltage output from the comparator COMP to the control terminal TYA.
像這樣，控制電路CON在調光訊號AS指示LED燈X滅燈時，將比較器COMP輸出的電壓，輸出至反饋手段YA的控制端子TYA。 As such, when the dimming signal AS instructs the LED lamp X to go out, the control circuit CON outputs the voltage output from the comparator COMP to the control terminal TYA of the feedback means YA.
即，控制電路CON將控制訊號SC輸出至反饋手段YA的控制端子(負極)TYA，從而在成為不滿將LED元件Xa的正方向電壓與LED燈X的LED元件Xa的階數進行積分後的電壓(滅燈)的同時， 使被提供至控制電路CON輸出電壓VC以第一電壓Vth1成為上限值並且以第二電壓Vth2成為下限值。 That is, the control circuit CON outputs the control signal SC to the control terminal (negative electrode) TYA of the feedback means YA, so that the voltage obtained by integrating the positive-direction voltage of the LED element Xa and the order of the LED element Xa of the LED lamp X becomes unsatisfactory. (Light off), The output voltage VC supplied to the control circuit CON is made to have an upper limit value at the first voltage Vth1 and a lower limit value at the second voltage Vth2.
另外，內部電源SX則將基於被提供至電源端子TS的輸出電壓VC，提供至控制電路CON的各個構成。 In addition, the internal power SX will be provided to each configuration of the control circuit CON based on the output voltage VC supplied to the power terminal TS.
接下來，將使用圖2對具有以上構成的LED用電源裝置100的運作的一例進行說明。 Next, an example of the operation of the LED power supply device 100 having the above configuration will be described using FIG. 2.
圖2是展示圖1所示的LED用電源裝置100中在LED亮燈與LED滅燈之間進行切換的運作波形的一例波形圖。 FIG. 2 is a waveform diagram showing an example of an operation waveform in the LED power supply device 100 shown in FIG. 1 for switching between LED on and off.
如圖2所示，例如，在模式(mode)為LED亮燈(調光)時，控制電路CON根據調光訊號AS的占空比(onduty)(調光電路AC輸出的直流電壓VA)，以切換電路SW作為第一狀態，將運算放大器OPA輸出的控制訊號輸出至控制端子TYA。 As shown in FIG. 2, for example, when the mode is LED on (dimming), the control circuit CON controls the on-duty of the dimming signal AS (the DC voltage VA output by the dimming circuit AC), With the switching circuit SW as the first state, the control signal output from the operational amplifier OPA is output to the control terminal TYA.
並且，反饋手段YA將指示LED燈X亮燈的反饋訊號FBS輸出至一次電路FC1。 In addition, the feedback means YA outputs a feedback signal FBS indicating that the LED lamp X is turned on to the primary circuit FC1.
一次電路FC1則根據反饋訊號FBS，將交流電壓輸出至一次線圈L1從而使LED燈X處流通能夠亮燈的恒定電流。 The primary circuit FC1 outputs an AC voltage to the primary coil L1 according to the feedback signal FBS, so that a constant current that can be turned on flows through the LED lamp X.
藉由這樣，調光訊號AS的值班，即，對應調光訊號AS所規定的調光率的LED燈X的電流ILED流通。藉由這樣，就會成為對應調光訊號AS所規定的調光率的LED燈X的電壓VLED。 By doing so, the duty of the dimming signal AS, that is, the current ILED of the LED lamp X corresponding to the dimming rate prescribed by the dimming signal AS flows. As a result, the voltage VLED of the LED lamp X corresponding to the dimming rate prescribed by the dimming signal AS is obtained.
此時，第二整流平滑電路A2輸出的輸出電壓VC會與LED電壓VLED相關地進行變化。 At this time, the output voltage VC output from the second rectifying and smoothing circuit A2 changes according to the LED voltage VLED.
另一方面，在模式(mode)為LED滅燈時，調光訊號AS的占空比(onduty)為變為零，控制電路CON以切換電路SW作為第二 狀態，將比較器COMP輸出的控制訊號輸出至控制端子TYA。 On the other hand, when the mode is LED off, the duty cycle (onduty) of the dimming signal AS becomes zero, and the control circuit CON uses the switching circuit SW as the second State, the control signal output by the comparator COMP is output to the control terminal TYA.
並且，反饋手段YA將指示LED燈X滅燈的反饋訊號FBS進行輸出。 In addition, the feedback means YA outputs a feedback signal FBS indicating that the LED lamp X is off.
並且，一次電路FC1根據該指示LED燈X滅燈的反饋訊號FBS，對輸出至一次線圈L1的交流電壓進行控制，從而使其不滿將LED元件Xa的正方向電壓與LED燈X的LED元件Xa的階數進行積分後的電壓(使其滅燈)。 In addition, the primary circuit FC1 controls the AC voltage output to the primary coil L1 based on the feedback signal FBS indicating that the LED lamp X goes out, so that it is dissatisfied with the positive voltage of the LED element Xa and the LED element Xa of the LED lamp X. The integrated voltage (make it off).
進一步地，在LED燈X滅燈時，第二整流平滑電路A2的輸出電壓VC被控制(電壓波紋控制)為：以比在調光訊號AS指示LED燈X亮燈時從第二整流平滑電路A2處輸出的輸出電壓更低的第一電壓Vth1作為上限值並且以比第一電壓Vth1更低的第二電壓Vth2作為下限值。 Further, when the LED lamp X is off, the output voltage VC of the second rectifying and smoothing circuit A2 is controlled (voltage ripple control) as follows: from the second rectifying and smoothing circuit when the dimming signal AS indicates that the LED lamp X is on. A first voltage Vth1 having a lower output voltage output at A2 is used as an upper limit value and a second voltage Vth2 lower than the first voltage Vth1 is used as a lower limit value.
藉由上述的運作，LED用電源裝置100中就不再需要用於為控制LED燈X亮燈的控制電路CON提供電源的輔助電源。 With the above operation, the auxiliary power source for supplying power to the control circuit CON for controlling the lighting of the LED lamp X is no longer required in the LED power supply device 100.
綜上所述，在本發明的一種形態所相關的LED用電源裝置中，包括：一次電路FC1，具有一次線圈L1，並且在根據反饋訊號FBS將交流電壓輸出至一次線圈；第一二次線圈L2a，與一次線圈L1構成變壓器Z；第二二次線圈L2b，其感應電動勢比第一二次線圈L2a的感應電動勢更小；第一整流平滑電路A1，與第一二次線圈L2a連接；LED燈X，與第一整流平滑電路A1連接，並且包含一個或被串聯的複數個LED元件Xa；電流檢測手段RX，位於第一整流平滑電路A1內，或是第一整流平滑電路A1與LED燈X之間；第二整流平滑電路A2，與第二二次線圈L2b連接；反饋手段YA，與第二整流平滑電路A2連接，並且基於電流檢測手段RX的檢測訊號，以及第二整流平滑電路A2的輸出 電壓，將反饋訊號FBS輸出至一次電路FC1；以及控制電路CON，藉由從第二整流平滑電路A2處提供的電力來驅動，並且根據：規定LED燈X調光率的調光訊號AS、電流檢測手段RX的檢測訊號、以及第二整流平滑電路A2的輸出電壓，將訊號輸出至反饋手段YA。 In summary, the LED power supply device according to one aspect of the present invention includes: a primary circuit FC1 having a primary coil L1 and outputting an AC voltage to the primary coil according to a feedback signal FBS; a first secondary coil L2a and the primary coil L1 constitute the transformer Z; the second secondary coil L2b has a smaller induced electromotive force than the first secondary coil L2a; the first rectifying and smoothing circuit A1 is connected to the first secondary coil L2a; the LED The lamp X is connected to the first rectifying and smoothing circuit A1 and includes one or a plurality of LED elements Xa connected in series; the current detection means RX is located in the first rectifying and smoothing circuit A1, or the first rectifying and smoothing circuit A1 and the LED lamp Between X; the second rectifying and smoothing circuit A2 is connected to the second secondary coil L2b; the feedback means YA is connected to the second rectifying and smoothing circuit A2 and is based on the detection signal of the current detection means RX and the second rectifying and smoothing circuit A2 Output Voltage, the feedback signal FBS is output to the primary circuit FC1; and the control circuit CON is driven by the power provided from the second rectification smoothing circuit A2, and according to: the dimming signal AS, the current that specifies the X dimming rate of the LED lamp The detection signal of the detection means RX and the output voltage of the second rectifying and smoothing circuit A2 output the signal to the feedback means YA.
特別是，控制電路CON在調光訊號AS指示LED燈X亮燈時，將控制訊號輸出至反饋手段YA的控制端子TYA，從而使LED燈X的電流對應調光訊號AS所規定的調光率，在調光訊號AS指示LED燈X滅燈時，將控制訊號輸出至反饋手段YA的控制端子TYA(波紋控制)，從而使第二整流平滑電路A2的輸出電壓成為預設電壓。 In particular, when the dimming signal AS indicates that the LED lamp X is on, the control circuit CON outputs the control signal to the control terminal TYA of the feedback means YA, so that the current of the LED lamp X corresponds to the dimming rate specified by the dimming signal AS. When the dimming signal AS indicates that the LED lamp X is off, the control signal is output to the control terminal TYA (ripple control) of the feedback means YA, so that the output voltage of the second rectifying and smoothing circuit A2 becomes a preset voltage.
藉由這樣，在調光訊號AS指示LED燈X亮燈時，恒定電流就被從一次電路FC1藉由第一二次線圈L2a提供至LED燈X從而使LED燈X亮燈，同時，用於驅動的電源電壓則藉由第二二次線圈L2b被提供至控制電路CON。 In this way, when the dimming signal AS indicates that the LED lamp X is turned on, a constant current is supplied from the primary circuit FC1 to the LED lamp X through the first secondary coil L2a so that the LED lamp X is turned on. The driving power supply voltage is supplied to the control circuit CON through the second secondary coil L2b.
另一方面，在調光訊號AS指示LED燈X滅燈時，則從一次電路FC1提供用於使LED燈X滅燈且能夠用於驅動的電力至控制電路CON。 On the other hand, when the dimming signal AS indicates that the LED lamp X is turned off, power from the primary circuit FC1 is provided to the control circuit CON to enable the LED lamp X to be turned off and can be used for driving.
這樣，本發明的一種形態所相關的LED用電源裝置，就能夠藉由削減用於將電源提供給控制LED燈X亮燈的控制電路CON的輔助電源，從而謀求裝置的小型化和降低製造成本。 In this way, the power supply device for an LED according to one aspect of the present invention can reduce the size of the device and reduce the manufacturing cost by reducing the auxiliary power supply for supplying power to the control circuit CON that controls the lighting of the LED lamp X. .
以上，就本發明的幾個實施方式進行了說明，這些實施方式是作為舉例而提示的，並沒有限定發明範圍的意圖。這些實施方式可以被其他的各種形態所實施，並且可以在不脫離發明要旨的範圍內進行種種的省略、替換、以及更改。這些實施方式或是其變形例是包含於本 發明範圍或要旨中的，同時，也是包含於與申請專利範圍所記載的發明 相均等的範圍中的。 In the foregoing, several embodiments of the present invention have been described. These embodiments are presented as examples, and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments or their modifications are included in this specification. The scope or gist of the invention is also included in the invention described in the scope of patent application In the same range.
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