TW201536106A - Method for driving LED chip - Google Patents
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Abstract
Description
本發明係與發光二極體晶片驅動有關;特別是指一種用於驅動發光二極體晶片的方法。 The invention relates to LED driving of a light-emitting diode; in particular to a method for driving a light-emitting diode wafer.
按,發光二極體照明裝置係包含有一發光二極體晶片與一驅動裝置,該驅動裝置用以提供該發光二極體晶片所需之電能。目前市面上的發光二極體晶片規格琳瑯滿目,所需之工作電壓或工作電流各不相同。為了驅動如此多種規格組合的發光二極體晶片,目前的方式是針對每一種發光二極體晶片開發一種驅動裝置。 According to the LED illumination device, a light-emitting diode chip and a driving device for supplying the electric energy required for the LED chip are provided. At present, the specifications of the LED chips on the market are numerous, and the required operating voltage or operating current are different. In order to drive a light-emitting diode wafer of such a plurality of specifications, the current approach is to develop a driving device for each of the light-emitting diode chips.
然,對於發光二極體照明裝置製造商而言,對每一種規格的發光二極體晶片都需製造一種驅動裝置,如此不但增加驅動裝置庫存的壓力,而且無法以量制價,導致製造成本居高不下,相對使發光二極體照明裝置之售價無法下降,這也是目前發光二極體照明裝置仍無法普及的原因之一。若能開發用可驅動多種電壓或多種電流的發光二極體晶片驅動方法,當可降低發光二極體晶片之驅動裝置庫存的壓力,並且有效降低製造成本。 However, for the manufacturer of the light-emitting diode lighting device, it is necessary to manufacture a driving device for each size of the LED chip, which not only increases the pressure of the driving device inventory, but also cannot be priced, resulting in manufacturing cost. The high price of the LED lighting device cannot be lowered, which is one of the reasons why the current LED lighting device is still not popular. If a light-emitting diode chip driving method capable of driving a plurality of voltages or a plurality of currents can be developed, the pressure of the driving device of the light-emitting diode chip can be reduced, and the manufacturing cost can be effectively reduced.
有鑑於此,本發明之目的用於提供一種用於驅動發光二極體晶片的方法,可適用於驅動不同電壓或電流之發光二極體晶片 In view of the above, the object of the present invention is to provide a method for driving a light-emitting diode wafer, which can be applied to a light-emitting diode chip for driving different voltages or currents.
緣以達成上述目的,本發明所提供用於驅動發光二極體晶片的方法,係應用於包含有複數個切換開關及一驅動單元的裝置,該些切換開關的開啟與關閉的組合態樣為2n,其中n為切換開關的數量,該驅動單元則電性連接一發光二極體晶片,該方法包含下列步驟:A、控制該些切換開關的開啟與關閉態樣為2n之組合態樣中的一種,並產生對應該組合態樣的一參考電壓;B、依據該參考電壓的大小,控制該驅動單元輸出相對應的一工作電壓予該發光二極體晶片;C、偵測該輸出予該發光二極體晶片的工作電壓,在測得的工作電壓脫離一設定電壓範圍以外時,控制該驅動單元調整輸出予該發光二極體晶片的工作電壓落於該設定電壓範圍內。 In order to achieve the above object, the method for driving a light-emitting diode chip is applied to a device including a plurality of switch switches and a drive unit, and the combination of the switch switches is turned on and off. 2 n , where n is the number of switching switches, the driving unit is electrically connected to a light emitting diode chip, and the method comprises the following steps: A. controlling the opening and closing states of the switching switches to be a combination state of 2 n One of the samples, and generates a reference voltage corresponding to the combined state; B, according to the magnitude of the reference voltage, controlling the driving unit to output a corresponding operating voltage to the LED chip; C, detecting the And outputting the operating voltage to the LED chip, and controlling the driving unit to adjust the output voltage to the LED chip to fall within the set voltage range when the measured operating voltage is out of a set voltage range.
本發明另提供一種用於驅動發光二極體晶片的方法,係應用於包含有複數個切換開關及一驅動單元的裝置,該些切換開關的開啟與關閉的組合態樣為2n,其中n為切換開關的數量,該驅動單元則電性連接一發光二極體晶片,該方法包含下列步驟:A、控制該些切換開關的開啟與關閉態樣為2n之組合態樣中的一種,並產生對應該組合態樣的一參考電壓;B、依據該參考電壓的大小,控制該驅動單元輸出相對應的一工作電流予該發光二極體晶片;C、偵測該輸出予該發光二極體晶片的工作電流,在測得的工作電流脫離一設定電流範圍以外時,控制該驅動單元調整輸出予該發光二極體晶片的工作電流落於該設定電流範圍內。 The invention further provides a method for driving a light-emitting diode wafer, which is applied to a device comprising a plurality of switch switches and a drive unit, wherein the combination of opening and closing of the switch switches is 2 n , wherein n In order to switch the number of switches, the driving unit is electrically connected to a light emitting diode chip, and the method comprises the following steps: A. controlling one of the combination of the opening and closing states of the switching switches to be 2 n , And generating a reference voltage corresponding to the combined aspect; B, controlling the output current corresponding to the output of the driving unit to the LED according to the magnitude of the reference voltage; C, detecting the output to the LED The working current of the polar body wafer controls the operating current of the driving unit to adjust the output to the LED chip to fall within the set current range when the measured operating current is out of a set current range.
本發明之效果在於利用不同電壓值的參考電壓,可使該驅動單元輸出不同工作電壓或工作電流的電能予發光二極體晶片,達到將多種驅動裝置整合為一之目的。有效改善習用的驅動裝置只能適用單一種規格的發光二極體晶片之不便。 The effect of the invention is that the reference voltage of different voltage values can be used to enable the driving unit to output electric energy of different working voltages or working currents to the LED chip, thereby achieving the purpose of integrating a plurality of driving devices into one. Effectively improving the conventional driving device can only be applied to the inconvenience of a single size of the LED chip.
1‧‧‧驅動裝置 1‧‧‧ drive
10‧‧‧驅動單元 10‧‧‧Drive unit
12‧‧‧電壓偵測單元 12‧‧‧Voltage detection unit
14‧‧‧分壓電路 14‧‧‧voltage circuit
16‧‧‧切換開關 16‧‧‧Toggle switch
162‧‧‧針腳 162‧‧‧ stitches
164‧‧‧跳接器 164‧‧‧ Jumper
18‧‧‧運算單元 18‧‧‧ arithmetic unit
20‧‧‧控制單元 20‧‧‧Control unit
2‧‧‧驅動裝置 2‧‧‧ drive
22‧‧‧電流偵測單元 22‧‧‧current detection unit
P‧‧‧電源 P‧‧‧Power supply
L‧‧‧發光二極體晶片 L‧‧‧Light Emitter Wafer
V‧‧‧電壓源 V‧‧‧voltage source
Vref‧‧‧參考電壓 Vref‧‧‧reference voltage
R1~R5‧‧‧電阻 R1~R5‧‧‧ resistance
圖1係本發明第一較佳實施例所應用的驅動裝置方塊圖。 BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram of a driving device to which the first preferred embodiment of the present invention is applied.
圖2係上述第一較佳實施例驅動裝置的電阻分壓電路的一實施態樣。 Fig. 2 is a view showing an embodiment of a resistor divider circuit of the driving apparatus of the first preferred embodiment.
圖3係上述較佳實施例用於驅動發光二極體晶片的方法流程圖。 3 is a flow chart of a method for driving a light emitting diode wafer in the above preferred embodiment.
圖4係本發明第二較佳實施例所應用的驅動裝置方塊圖。 Figure 4 is a block diagram of a driving device to which the second preferred embodiment of the present invention is applied.
圖5係上述第二較佳實施例用於驅動發光二極體晶片的方法流程圖。 FIG. 5 is a flow chart of a method for driving a light emitting diode wafer according to the second preferred embodiment.
為能更清楚地說明本發明,茲舉較佳實施例並配合圖示詳細說明如后,請參圖1所示,為本發明第一較佳實施例用於驅動發光二極體晶片的方法所應用的驅動裝置1,包含有一驅動單元10、一電壓偵測單元12、一分壓電路14、複數個切換開關16、一運算單元18與一控制單元20。 In order to explain the present invention more clearly, the preferred embodiment will be described in detail with reference to the accompanying drawings, as shown in FIG. 1, which is a method for driving a light-emitting diode wafer according to a first preferred embodiment of the present invention. The driving device 1 includes a driving unit 10, a voltage detecting unit 12, a voltage dividing circuit 14, a plurality of switching switches 16, an arithmetic unit 18 and a control unit 20.
該驅動單元10電性連接一電源P與一發光二極體晶片L,該驅動單元10接收該電源P的電能並轉換為該發光二極體晶片L所需之一工作電壓及一工作電流後輸出。該驅動單元10係可受控制地改變該工作電壓的大小。在實務上,該驅動單元10可為採用PWM、半橋式、Buck、Boost等型式的電路為基礎進行設計。 The driving unit 10 is electrically connected to a power source P and a light emitting diode chip L. The driving unit 10 receives the power of the power source P and converts it into a working voltage and an operating current required by the LED chip L. Output. The drive unit 10 is controllably varying the magnitude of the operating voltage. In practice, the drive unit 10 can be designed based on circuits of the PWM, half bridge, Buck, Boost, and the like.
該電壓偵測單元12電性連接該驅動單元10,用以偵測該驅動單元10輸出予該發光二極體晶片L的工作電壓。 The voltage detecting unit 12 is electrically connected to the driving unit 10 for detecting an operating voltage of the driving unit 10 outputted to the LED chip L.
該分壓電路14在本實施例中為一電阻分壓電路,電性連接該些切換開關16,該些切換開關16再電性連接至一電壓源V。本實施例中,各該切換開關16包括二針腳(Pin)162與一跳接器(Jumper)164,該二針腳162分別電性連接該電壓源V與該分壓電路14,該跳接器164可拆離地連接該二針腳162,使各該切換開關16呈開路或短路狀態。該分壓電路14將該電壓源V進行分壓後產生一參考電壓VRef。請配合圖2所示,本實施例的分壓電路14包括複數個並聯的電阻R1~R4及一電阻R5與電阻R1~R4串聯,其中,電阻R1~R4係透過該些切換開關16連接至該電壓源V,電阻R4係直接連接至該電壓源V,電阻R1~R4共同透過電阻R5接地,藉此電阻R5之分壓即形成該參考電壓Vref。 In this embodiment, the voltage dividing circuit 14 is a resistor divider circuit electrically connected to the switching switches 16, and the switching switches 16 are electrically connected to a voltage source V. In this embodiment, each of the changeover switches 16 includes a two-pin (Pin) 162 and a jumper 164. The two pins 162 are electrically connected to the voltage source V and the voltage dividing circuit 14, respectively. The 164 is detachably connected to the two pins 162 such that each of the changeover switches 16 is in an open or short circuit state. The voltage dividing circuit 14 divides the voltage source V to generate a reference voltage VRef. As shown in FIG. 2, the voltage dividing circuit 14 of the present embodiment includes a plurality of parallel resistors R1 R R4 and a resistor R5 connected in series with resistors R1 R R4. The resistors R1 R R4 are connected through the switch 16 . To the voltage source V, the resistor R4 is directly connected to the voltage source V, and the resistors R1 to R4 are commonly grounded through the resistor R5, whereby the voltage division of the resistor R5 forms the reference voltage Vref.
茲定義該些切換開關16的開、關狀態之組成構成複數種組合態樣,該些切換開關16的數量為n,所構成的組合態樣數量為2n個。舉例而言,三個切換開關16可構成的組合態樣為個(23)。三個切換開關16構成的組合態樣配合不同電阻值的電阻R1~R4,即可使電阻R1~R4形成種不同電阻值的等效電阻。改變該些切換開關16的跳接器164與對應的針腳162結合或分離即可使該分壓電路14形成的等效電阻為八種電阻值中的其中一者,換言之,該分壓電路14可輸出八種電壓值其中一者的參考電壓。 The components defining the on and off states of the switch 16 constitute a plurality of combinations. The number of the switches 16 is n, and the number of combined states is 2 n . For example, the three switching switches 16 can be combined to form a single (2 3 ). The combination of the three switches 16 is matched with the resistors R1 to R4 of different resistance values, so that the resistors R1 to R4 form an equivalent resistance of different resistance values. The jumper 164 of the changeover switch 16 is combined or separated from the corresponding pin 162 to make the equivalent resistance formed by the voltage dividing circuit 14 one of eight resistance values, in other words, the partial piezoelectricity. Circuit 14 can output a reference voltage for one of eight voltage values.
該運算單元18電性連接該電壓偵測單元12與該分壓電路14,且該運算單元18透過該控制單元20電性連接該驅動單元10。該運算單元18依據該參考電壓Vref 的大小透過該控制單元20輸出對應的電訊號控制該驅動單元10,以使該驅動單元10輸出對應該參考電壓Vref大小之該工作電壓,且該驅動單元10輸出的該工作電壓係正比於該參考電壓。舉例而言,該驅動單元可輸出的工作電壓為28V~21V其中一者,最大的參考電壓Vref係對應輸出的工作電壓為28V,次大的參考電壓Vref係對應輸出的工作電壓為27W,以此類推。此外,該運算單元18更依據該電壓偵測單元12所測得之電壓與該參考電壓Vref比較,並透過該控制單元20控制該驅動單元10,藉以使該驅動單元10所輸出的工作電壓維持在一設定電壓範圍內。 The computing unit 18 is electrically connected to the voltage detecting unit 12 and the voltage dividing circuit 14 , and the computing unit 18 is electrically connected to the driving unit 10 through the control unit 20 . The operation unit 18 is based on the reference voltage Vref The driving unit 10 controls the driving unit 10 by outputting a corresponding electrical signal, so that the driving unit 10 outputs the operating voltage corresponding to the magnitude of the reference voltage Vref, and the operating voltage output by the driving unit 10 is proportional to the operating voltage. Reference voltage. For example, the driving unit can output an operating voltage of one of 28V~21V, and the maximum reference voltage Vref corresponds to an output operating voltage of 28V, and the next largest reference voltage Vref corresponds to an output operating voltage of 27W. This type of push. In addition, the computing unit 18 compares the voltage measured by the voltage detecting unit 12 with the reference voltage Vref, and controls the driving unit 10 through the control unit 20, so that the operating voltage output by the driving unit 10 is maintained. Within a set voltage range.
藉此,利用前述之驅動裝置1即可進行圖3所示之驅動方法:首先,使用者根據所連接的發光二極體晶片L的電壓規格設定該些切換開關16的之開啟與關閉態樣為2n之組合態樣中的一種,使該驅動單元10輸出符合該發光二極體晶片L規格的電壓。舉例而言,該驅動單元10可輸出的電壓為28V~21V其中一者之電能,而所連接的發光二極體晶片L的電壓規格為28V時,使用者將三個跳接器164皆接上對應的針腳162,此時,電阻R1~R4因並聯之故,其等效電阻最小,使該電壓源V分壓於電阻R5的電壓最大,而產生最大的參考電壓Vref輸出給該運算單元18,進而使該運算單元18透過該控制單元20控制該驅動單元10輸出28V的工作電壓予該發光二極體晶片L。 Therefore, the driving method shown in FIG. 3 can be performed by using the driving device 1 described above. First, the user sets the opening and closing states of the switching switches 16 according to the voltage specifications of the connected LED chips L. In one of the combined forms of 2 n , the driving unit 10 outputs a voltage that conforms to the specification of the LED of the light-emitting diode. For example, the voltage outputted by the driving unit 10 is one of 28V~21V, and when the voltage specification of the connected LED chip L is 28V, the user connects the three jumpers 164. The corresponding pin 162 is connected. At this time, the resistors R1 R R4 are connected in parallel, and the equivalent resistance is the smallest, so that the voltage of the voltage source V is divided by the voltage of the resistor R5, and the maximum reference voltage Vref is output to the arithmetic unit. 18. The arithmetic unit 18 is further controlled by the control unit 20 to control the driving unit 10 to output an operating voltage of 28 V to the LED array L.
接著,該運算單元18持續地透過該電壓偵測單元12偵測該工作電壓及透過該控制單元20控制該驅動單元10,使輸出予該發光二極體晶片L的工作電壓維持在該設定電壓範圍內,在測得的工作電壓脫離該設定電壓範圍以外時,控制該驅動單元調整輸出予該發光二極體晶片的工作 電壓落於該設定電壓範圍內,藉此形成定電壓的驅動裝置1。 Then, the computing unit 18 continuously detects the operating voltage through the voltage detecting unit 12 and controls the driving unit 10 through the control unit 20 to maintain the operating voltage outputted to the LED chip L at the set voltage. In the range, when the measured operating voltage is out of the set voltage range, the driving unit is controlled to adjust the output to the LED chip. The voltage falls within the set voltage range, thereby forming a constant voltage drive device 1.
在使用上,若換成連接規格為27V的發光二極體晶片L時,則再將對應的跳接器164拆離,使該參考電壓Vref再下降一級,即可以同樣的方式再控制該驅動單元10,使其輸出27V之電能。同樣地,將所有的跳接器164拆離後,電阻R1~R4構成的等效電阻最大,使得電阻R5的分壓最小,而輸出的參考電壓Vref最小,對應21V之工作電壓。 In use, if the LED diode L of the connection specification of 27V is replaced, the corresponding jumper 164 is detached again, and the reference voltage Vref is further lowered by one step, that is, the drive can be controlled in the same manner. Unit 10 is enabled to output 27V of electrical energy. Similarly, after all the jumpers 164 are detached, the equivalent resistance of the resistors R1 to R4 is the largest, so that the voltage division of the resistor R5 is the smallest, and the output reference voltage Vref is the smallest, corresponding to the operating voltage of 21V.
據上所述,本實施例中使用跳接器164與針腳162作為切換開關16可有效地降低零件成本。利用切換開關16構成的多種組合態樣使該驅動裝置1形成可輸出不同電壓的定電壓驅動裝置1,達到將多種定電壓驅動裝置整合為一之目的,有效改善習用的驅動裝置只能適用單一種規格的發光二極體晶片L之不便。 According to the above, the use of the jumper 164 and the pin 162 as the changeover switch 16 in the present embodiment can effectively reduce the component cost. The driving device 1 is formed into a constant voltage driving device 1 capable of outputting different voltages by using various combinations of the switching switches 16 to achieve the purpose of integrating a plurality of constant voltage driving devices, and the driving device can effectively improve the conventional driving device. The inconvenience of a standard light-emitting diode chip L.
請參圖4所示,為本發明第二較佳實施例用於驅動發光二極體晶片的方法所應用的驅動裝置2,其具有大致相同於第一實施例之結構,不同的是,該驅動單元10係受控制地改變輸出的工作電流的大小,而該運算單元18依據該參考電壓Vref的大小透過該控制單元20輸出對應的電訊號控制該驅動單元10,以使該驅動單元10輸出對應該參考電壓Vref大小之該工作電流,且該驅動單元10輸出的該工作電流係正比於該參考電壓Vref。此外,本實施例的驅動裝置2未設置電壓偵測單元12而是設置一電流偵測單元22,該電流偵測單元22偵測該驅動單元10輸出予該發光二極體L的工作電流並將其轉換為對應的電壓訊號輸入該運算單元18。該運算單元依據該電流偵測單元22所輸出的電壓訊號與該參考電壓Vref比較,並透過該控制單元20控制該驅動單元10,藉以使該驅動單元10所輸出的工作電流維 持在一設定電流範圍內。 Referring to FIG. 4, a driving device 2 for applying the method for driving a light-emitting diode wafer according to a second preferred embodiment of the present invention has substantially the same structure as that of the first embodiment, except that the The driving unit 10 is controlled to change the magnitude of the output operating current, and the computing unit 18 controls the driving unit 10 to output the corresponding driving signal through the control unit 20 according to the magnitude of the reference voltage Vref, so that the driving unit 10 outputs The operating current corresponding to the magnitude of the voltage Vref is referenced, and the operating current output by the driving unit 10 is proportional to the reference voltage Vref. In addition, the driving device 2 of the present embodiment is not provided with the voltage detecting unit 12, but is provided with a current detecting unit 22, and the current detecting unit 22 detects the operating current of the driving unit 10 outputted to the light emitting diode L. It is converted into a corresponding voltage signal and input to the arithmetic unit 18. The computing unit compares the voltage signal outputted by the current detecting unit 22 with the reference voltage Vref, and controls the driving unit 10 through the control unit 20, so that the operating current output of the driving unit 10 is Hold in a set current range.
同樣地,該驅動裝置2進行圖5所示之驅動方法。首先,使用者根據所連接的發光二極體晶片L的電流規格設定該些切換開關16的之開、關狀態以構成其中一該組合態樣。舉例而該,該驅動單元可輸出的電流為400mA~330mA其中一者之電能,而所連接的發光二極體晶片L的電流規格為400mA時,則設定將三個跳接器164皆接上對應的針腳162,以產生最大的參考電壓Vref。使該運算單元18透過該控制單元20控制該驅動單元10輸出400mA的工作電流予該發光二極體晶片L。 Similarly, the drive device 2 performs the driving method shown in FIG. First, the user sets the on and off states of the switch 16 according to the current specification of the connected LED chip L to form one of the combined views. For example, the driving unit can output a current of one of 400 mA to 330 mA, and when the current specification of the connected LED chip L is 400 mA, the three jumpers 164 are connected. Corresponding pins 162 are generated to generate a maximum reference voltage Vref. The arithmetic unit 18 is caused to control the driving unit 10 to output an operating current of 400 mA to the light-emitting diode wafer L through the control unit 20.
接著,該運算單元18持續地透過該電流偵測單元22偵測該工作電流及透過該控制單元20控制該驅動單元10,使輸出予該發光二極體晶片L的工作電流維持在該設定電流範圍內,在測得的工作電壓脫離該設定電流範圍以外時,控制該驅動單元調整輸出予該發光二極體晶片的工作電流落於該設定電流範圍內,藉此形成定電流的驅動裝置2。 Then, the computing unit 18 continuously detects the operating current through the current detecting unit 22 and controls the driving unit 10 through the control unit 20 to maintain the operating current outputted to the LED chip L at the set current. In the range, when the measured operating voltage is out of the set current range, the driving unit that controls the driving unit to adjust the output current to the LED chip falls within the set current range, thereby forming a constant current driving device 2 .
藉此,透過設定該些切換開關16的組合態樣即可使該驅動單元10輸出400mA、390mA、380mA、370mA、360mA、350mA 340mA、330mA等八種電流之其中一種。藉此形成可輸出不同電流的定電流驅動裝置2,達到將多種定電流驅動裝置整合為一之目的,有效改善習用的驅動裝置只能適用單一種規格的發光二極體晶片之不便。 Thereby, the drive unit 10 can output one of eight currents of 400 mA, 390 mA, 380 mA, 370 mA, 360 mA, 350 mA 340 mA, and 330 mA by setting the combination of the switches 16. Thereby, a constant current driving device 2 capable of outputting different currents is formed, thereby achieving the purpose of integrating a plurality of constant current driving devices, and effectively improving the inconvenience that the conventional driving device can only be applied to a single-dimension LED chip.
以上所述僅為本發明較佳可行實施例而已,舉凡應用本發明說明書及申請專利範圍所為之等效變化,理應包含在本發明之專利範圍內。 The above is only a preferred embodiment of the present invention, and equivalent changes to the scope of the present invention and the scope of the patent application are intended to be included in the scope of the present invention.
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