TWI419603B - Led circuit - Google Patents

Led circuit Download PDF

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Publication number
TWI419603B
TWI419603B TW98110180A TW98110180A TWI419603B TW I419603 B TWI419603 B TW I419603B TW 98110180 A TW98110180 A TW 98110180A TW 98110180 A TW98110180 A TW 98110180A TW I419603 B TWI419603 B TW I419603B
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capacitor
voltage
circuit
switch
mos transistor
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TW98110180A
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Chinese (zh)
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TW201036484A (en
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Chingwei Hsueh
Kuanjen Tseng
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Himax Analogic Inc
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Description

發光二極體電路 Light-emitting diode circuit

本發明是有關於一種發光二極體電路,且特別是有關於一種具有快速補償機制之發光二極體電路。 The present invention relates to a light emitting diode circuit, and more particularly to a light emitting diode circuit having a fast compensation mechanism.

發光二極體係較傳統的鎢絲燈泡具有四倍的效能。並且在經濟效益上,發光二極體與具有有毒水銀的日光燈相較之下,亦能維持更長的工作時間。因此,發光二極體將成為照明技術的主流。 The light-emitting diode system is four times more efficient than a conventional tungsten light bulb. And in terms of economic efficiency, the light-emitting diode can maintain a longer working time than a fluorescent lamp with toxic mercury. Therefore, the light-emitting diode will become the mainstream of lighting technology.

發光二極體電路中的開關電路部份,係用以對發光二極體進行充電以及放電。而發光二極體電路中的脈衝寬度調變模組,須要具有大阻容常數(RC constant)的阻容電路來進行補償。然而,傳統的設計中,具有大阻容常數的阻容電路雖然可以提供大量的充電電流,卻在放電過程時較緩慢,而具有較差的表現。因此,發光二極體電路的開關過程,將因上述阻容電路的影響而失去了線性度。 The switching circuit portion of the LED circuit is used to charge and discharge the LED. The pulse width modulation module in the LED circuit needs to have a large RC constant resistance circuit to compensate. However, in the conventional design, the RC circuit with a large RC constant can provide a large amount of charging current, but it is slower in the discharge process and has poor performance. Therefore, the switching process of the LED circuit will lose linearity due to the influence of the above-mentioned resistor-capacitor circuit.

因此,如何設計一個新的發光二極體電路,使發光二極體電路中的開關電路能夠在不喪失線性度下,提供補償之機制,乃為此一業界亟待解決的問題。 Therefore, how to design a new LED circuit to enable the switching circuit in the LED circuit to provide compensation without losing linearity is an urgent problem to be solved in the industry.

本發明之目的係在提供一種發光二極體電路,包含:電感、一組發光二極體、功率金氧半電晶體及開關電路。 電感電性連接供應電源以及第一節點;發光二極體電性連接於第一節點以及接地電位;功率金氧半電晶體電性連接於第一節點及接地電位;以及開關電路電性連接功率金氧半電晶體之閘極,用以輸出一開關訊號開啟或關閉該功率金氧半電晶體,包含:誤差放大器、脈衝寬度調變模組、阻容電路以及控制裝置。誤差放大器根據調光電壓產生誤差輸出,其中調光電壓具有活動週期及非活動週期;脈衝寬度調變模組用以根據誤差輸出產生開關訊號,俾控制功率金氧半電晶體開啟時對發光二極體進行充電,或控制功率金氧半電晶體關閉時對發光二極體進行放電;阻容電路包含:至少一第一電容;至少一第二電容;一開關,由一控制訊號控制,開關電性連接第一電容與第二電容;阻抗元件串聯於誤差輸出與第二電容及開關之間;以及控制裝置係用以根據調光電壓產生控制訊號,其中當調光電壓位於活動週期,控制訊號係打開開關以使第一電容連接第二電容,俾使阻容電路進行充電,並使開關訊號控制控制功率金氧半電晶體開啟以打開發光二極體,當調光電壓位於非活動週期,控制訊號係關閉開關以斷開第一電容與第二電容之連接,俾使阻容電路進行放電,並使開關訊號控制功率金氧半電晶體關閉以關閉發光二極體。 The object of the present invention is to provide a light emitting diode circuit comprising: an inductor, a group of light emitting diodes, a power MOS transistor and a switching circuit. The inductor is electrically connected to the power supply and the first node; the light emitting diode is electrically connected to the first node and the ground potential; the power metal oxide half transistor is electrically connected to the first node and the ground potential; and the switching circuit is electrically connected to the power The gate of the MOS transistor is used to output a switching signal to turn on or off the power MOS transistor, including: an error amplifier, a pulse width modulation module, a RC circuit, and a control device. The error amplifier generates an error output according to the dimming voltage, wherein the dimming voltage has an active period and an inactive period; the pulse width modulation module is configured to generate a switching signal according to the error output, and control the power of the metal oxide half crystal to turn on the light The pole body is charged, or the power MOS transistor is turned off to discharge the light emitting diode; the RC circuit includes: at least one first capacitor; at least one second capacitor; a switch controlled by a control signal, the switch Electrically connecting the first capacitor and the second capacitor; the impedance component is connected in series between the error output and the second capacitor and the switch; and the control device is configured to generate the control signal according to the dimming voltage, wherein when the dimming voltage is in the active period, the control The signal is turned on to connect the first capacitor to the second capacitor, so that the RC circuit charges, and the switching signal control controls the power MOS transistor to turn on to turn on the LED, when the dimming voltage is in the inactive period. The control signal is turned off to disconnect the first capacitor from the second capacitor, causing the RC circuit to discharge and OFF control signal power metal oxide semiconductor transistor is turned off to turn off the light emitting diode.

應用本發明之優點係在於藉由控制裝置於不同的週期間控制阻容電路之阻容值,而使開關電路能夠在不喪失線性度下,提供補償之機制,而輕易地達到上述之目的。 The advantage of the application of the present invention is that the control circuit can easily achieve the above purpose by controlling the resistance value of the RC circuit during different periods, so that the switching circuit can provide a compensation mechanism without losing linearity.

請參照第1圖,係為本發明之一實施例中,發光二極體電路1之示意圖。發光二極體電路1包含電感10、一組發光二極體12、功率金氧半電晶體14、開關電路16以及負載18。電感10係與供應電源Vss以及第一節點11相電性連接。而發光二極體12一端電性連接於第一節點11,另一端電性連接於負載18。而負載18用以自發光二極體12接收輸出電壓13後,進一步與接地電位GND進行實質之連接。功率金氧半電晶體14電性連接於第一節點11及接地電位GND。開關電路16用以產生開關訊號15,以對功率金氧半電晶體14之閘極進行控制。發光二極體電路1更包含電容120,當開關訊號15開啟功率金氧半電晶體14時,功率金氧半電晶體14開始對電容120進行充電,以進一步打開發光二極體12。而當開關訊號15關閉功率金氧半電晶體14時,功率金氧半電晶體14開始使電容120進行放電,以進一步關閉發光二極體12。 Please refer to FIG. 1 , which is a schematic diagram of a light-emitting diode circuit 1 according to an embodiment of the present invention. The light-emitting diode circuit 1 includes an inductor 10, a set of light-emitting diodes 12, a power MOS transistor 14, a switching circuit 16, and a load 18. The inductor 10 is electrically connected to the power supply Vss and the first node 11. One end of the LED 12 is electrically connected to the first node 11 , and the other end is electrically connected to the load 18 . The load 18 is used to receive the output voltage 13 from the LED 12, and is further substantially connected to the ground potential GND. The power MOS transistor 14 is electrically connected to the first node 11 and the ground potential GND. The switching circuit 16 is operative to generate a switching signal 15 for controlling the gate of the power MOS transistor 14. The LED circuit 1 further includes a capacitor 120. When the switching signal 15 turns on the power MOS transistor 14, the power MOS transistor 14 begins to charge the capacitor 120 to further turn on the LED 12. When the switching signal 15 turns off the power MOS transistor 14, the power MOS transistor 14 begins to discharge the capacitor 120 to further turn off the LED 12.

請參照第2圖,係為本發明之一實施例中,開關電路16之示意圖。開關電路16包含:誤差放大器20、脈衝寬度調變模組22、振盪器24、阻容電路26以及控制裝置28。誤差放大器20包含非反相輸入端(+)以及反相輸入端(-),其中非反相輸入端係用以接收參考電壓Vr,而反相輸入端係用以接收發光二極體12之輸出電壓13。參考電壓Vr係根據調光電壓Vd產生。調光電壓Vd具有活動週期及非活動週期,其中活動週期及非活動週期間的切換決定了發光二極體12的運作模式。誤差輸出21係根據參考電壓Vr及輸出電壓13產生。振盪器24用以產生振盪訊號23。脈 衝寬度調變模組22係實質上根據誤差輸出21以及振盪訊號23產生開關訊號15以控制功率金氧半電晶體14之閘極,進一步對發光二極體12進行充電或放電。阻容電路26包含:一開關262、第一電容260、第二電容264以及阻抗元件266。阻抗元件266則串聯於誤差輸出21與開關262及第二電容264之間。須注意的是,於其他實施例中,第一及第二電容之數目係可隨情況進行調整,而不限於本實施例中之數目。脈衝寬度調變模組22須要具有大阻容常數之阻容電路26以進行補償作用。然而傳統的設計中,具有大阻容常數的阻容電路雖然可以提供大量的充電電流,卻在放電過程時較緩慢,而具有較差的表現。因此,發光二極體電路的開關過程,將因上述阻容電路的影響而失去了線性度。本發明之控制裝置28以及阻容電路26係同時可提供大量的充電電流以及快速的放電機制。於本實施例中,控制裝置28包含比較器280以及及閘282。比較器280用以根據參考電壓Vr以及臨界電壓Vt產生比較結果281。當調光電壓Vd係位於活動週期,於本實施例中係為一高態電壓,則根據調光電壓Vd所產生的參考電壓Vr將大於臨界電壓Vt,以使比較結果281為高電位。而當調光電壓Vd係位於非活動週期,參考電壓Vr係小於臨界電壓Vt,以使比較結果281為低電位。然而,僅靠比較結果281,將無法分辨調光電壓Vd係位於正緣(rising edge)或是負緣(falling edge)狀況。換句話說,比較結果281無法保證在上述兩個邊緣狀況時,參考電壓Vr是正要變為大於臨界電壓Vt之值或是正要變為小於臨界電壓Vt之值。因此,及閘282用以接收比較結果281以及調光電壓Vd,以判斷 邊緣狀況,而產生準確之控制訊號283。 Please refer to FIG. 2, which is a schematic diagram of the switch circuit 16 in an embodiment of the present invention. The switch circuit 16 includes an error amplifier 20, a pulse width modulation module 22, an oscillator 24, a RC circuit 26, and a control device 28. The error amplifier 20 includes a non-inverting input terminal (+) and an inverting input terminal (-), wherein the non-inverting input terminal is configured to receive the reference voltage Vr, and the inverting input terminal is configured to receive the light-emitting diode 12 Output voltage 13. The reference voltage Vr is generated in accordance with the dimming voltage Vd. The dimming voltage Vd has an active period and an inactive period, wherein switching between the active period and the inactive period determines the operating mode of the LED 12 . The error output 21 is generated based on the reference voltage Vr and the output voltage 13. The oscillator 24 is used to generate the oscillation signal 23. pulse The punch width modulation module 22 substantially generates the switching signal 15 according to the error output 21 and the oscillation signal 23 to control the gate of the power MOS transistor 14, and further charges or discharges the LED 12 . The RC circuit 26 includes a switch 262, a first capacitor 260, a second capacitor 264, and an impedance element 266. The impedance element 266 is connected in series between the error output 21 and the switch 262 and the second capacitor 264. It should be noted that in other embodiments, the number of the first and second capacitors may be adjusted as the case may be, and is not limited to the number in the embodiment. The pulse width modulation module 22 needs to have a large RC capacitance resistance circuit 26 for compensation. However, in the conventional design, the RC circuit with a large RC constant can provide a large amount of charging current, but it is slower in the discharge process and has poor performance. Therefore, the switching process of the LED circuit will lose linearity due to the influence of the above-mentioned resistor-capacitor circuit. The control device 28 and the RC circuit 26 of the present invention simultaneously provide a large amount of charging current and a fast discharge mechanism. In the present embodiment, control device 28 includes comparator 280 and AND gate 282. The comparator 280 is configured to generate a comparison result 281 according to the reference voltage Vr and the threshold voltage Vt. When the dimming voltage Vd is in the active period, which is a high voltage in this embodiment, the reference voltage Vr generated according to the dimming voltage Vd will be greater than the threshold voltage Vt, so that the comparison result 281 is high. When the dimming voltage Vd is in the inactive period, the reference voltage Vr is less than the threshold voltage Vt, so that the comparison result 281 is low. However, by merely comparing the result 281, it will be impossible to distinguish whether the dimming voltage Vd is located at a rising edge or a falling edge. In other words, the comparison result 281 cannot guarantee that the reference voltage Vr is becoming a value larger than the threshold voltage Vt or is becoming smaller than the threshold voltage Vt in the above two edge conditions. Therefore, the gate 282 is configured to receive the comparison result 281 and the dimming voltage Vd to determine The edge condition produces an accurate control signal 283.

以及控制裝置係用以根據調光電壓產生控制訊號,其中當調光電壓位於活動週期,控制訊號係打開第一電容之開關以使第一電容運作,俾使阻容電路進行充電,當調光電壓位於非活動週期,控制訊號係關閉第一電容之開關,俾使阻容電路進行放電。 And the control device is configured to generate a control signal according to the dimming voltage, wherein when the dimming voltage is in the active period, the control signal turns on the switch of the first capacitor to operate the first capacitor, so that the resistive capacitor is charged, when dimming The voltage is in the inactive period, and the control signal turns off the switch of the first capacitor, so that the resistor-capacitor circuit discharges.

因此,於調光電壓Vd在活動週期時,控制訊號283將開啟開關262以啟動第一電容260,使阻容電路26以較大的阻容常數執行充電,以對脈衝寬度調變模組22進行補償。而另一方面,於調光電壓Vd在非活動週期時,控制訊號283將關閉開關262以進一步關閉第一電容260,使阻容電路26以較小的阻容常數執行放電。因此,藉由控制訊號283,本發明之阻容電路26係可提供於充電時提供大量的充電電流,且能同時提供快速的放電機制。 Therefore, when the dimming voltage Vd is in the active period, the control signal 283 will turn on the switch 262 to activate the first capacitor 260, so that the resistive capacitor circuit 26 performs charging with a larger RC constant to the pulse width modulation module 22 Make compensation. On the other hand, when the dimming voltage Vd is in an inactive period, the control signal 283 will turn off the switch 262 to further turn off the first capacitor 260, so that the resistor-capacitor circuit 26 performs discharging with a small RC constant. Therefore, by controlling the signal 283, the RC circuit 26 of the present invention can provide a large amount of charging current when charging, and can simultaneously provide a fast discharge mechanism.

雖然本發明已以實施方式揭露如上,然其並非用以限定本發明,任何熟習此技藝者,在不脫離本發明之精神和範圍內,當可作各種之更動與潤飾,因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。 Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

1‧‧‧發光二極體電路 1‧‧‧Lighting diode circuit

10‧‧‧電感 10‧‧‧Inductance

11‧‧‧第一節點 11‧‧‧ first node

12‧‧‧發光二極體 12‧‧‧Lighting diode

120‧‧‧電容 120‧‧‧ Capacitance

13‧‧‧輸出電壓 13‧‧‧Output voltage

14‧‧‧功率金氧半電晶體 14‧‧‧Power MOS semi-transistor

15‧‧‧開關訊號 15‧‧‧Switch signal

16‧‧‧開關電路 16‧‧‧Switch circuit

18‧‧‧負載 18‧‧‧load

20‧‧‧誤差放大器 20‧‧‧Error amplifier

21‧‧‧誤差輸出 21‧‧‧ Error output

22‧‧‧脈衝寬度調變模組 22‧‧‧ pulse width modulation module

23‧‧‧振盪訊號 23‧‧‧Oscillation signal

24‧‧‧振盪器 24‧‧‧Oscillator

26‧‧‧阻容電路 26‧‧‧Resistor circuit

260‧‧‧第一電容 260‧‧‧first capacitor

262‧‧‧開關 262‧‧‧ switch

264‧‧‧第二電容 264‧‧‧second capacitor

266‧‧‧阻抗元件 266‧‧‧ impedance components

28‧‧‧控制裝置 28‧‧‧Control device

280‧‧‧比較器 280‧‧‧ comparator

281‧‧‧比較結果 281‧‧‧Comparative results

282‧‧‧及閘 282‧‧‧ and gate

283‧‧‧控制訊號 283‧‧‧Control signal

為讓本發明之上述和其他目的、特徵、優點與實施例能更明顯易懂,所附圖式之說明如下:第1圖係為本發明之一實施例中,發光二極體電路之示意圖;以及第2圖係為本發明之一實施例中,開關電路之示意圖。 The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; And FIG. 2 is a schematic diagram of a switching circuit in an embodiment of the present invention.

1‧‧‧發光二極體電路 1‧‧‧Lighting diode circuit

13‧‧‧輸出電壓 13‧‧‧Output voltage

15‧‧‧開關訊號 15‧‧‧Switch signal

16‧‧‧開關電路 16‧‧‧Switch circuit

20‧‧‧誤差放大器 20‧‧‧Error amplifier

21‧‧‧誤差輸出 21‧‧‧ Error output

22‧‧‧脈衝寬度調變模組 22‧‧‧ pulse width modulation module

23‧‧‧振盪訊號 23‧‧‧Oscillation signal

24‧‧‧振盪器 24‧‧‧Oscillator

26‧‧‧阻容電路 26‧‧‧Resistor circuit

260‧‧‧第一電容 260‧‧‧first capacitor

262‧‧‧開關 262‧‧‧ switch

264‧‧‧第二電容 264‧‧‧second capacitor

266‧‧‧阻抗元件 266‧‧‧ impedance components

28‧‧‧控制裝置 28‧‧‧Control device

280‧‧‧比較器 280‧‧‧ comparator

281‧‧‧比較結果 281‧‧‧Comparative results

282‧‧‧及閘 282‧‧‧ and gate

283‧‧‧控制訊號 283‧‧‧Control signal

Claims (6)

一種發光二極體電路,包含:一電感,電性連接一供應電源以及一第一節點;一組發光二極體,該組發光二極體電性連接於該第一節點以及一接地電位;一功率金氧半電晶體,電性連接於該第一節點及該接地電位;以及一開關電路,電性連接該功率金氧半電晶體之閘極,用以輸出一開關訊號開啟或關閉該功率金氧半電晶體,並包含:一誤差放大器,根據一調光電壓產生一誤差輸出,其中該調光電壓具有一活動(active)週期及一非活動(inactive)週期;一脈衝寬度調變模組,用以根據該誤差輸出產生該開關訊號,俾控制該功率金氧半電晶體開啟時對該組發光二極體進行充電,以及控制該功率金氧半電晶體關閉時對該組發光二極體放電;一阻容電路,包含:至少一第一電容;至少一第二電容;一開關,係由一控制訊號控制,該開關之一端電性連接於該第一電容,該開關之另一端電性連接於該第二電容;以及一阻抗元件,係串聯於該誤差輸出與該第二電容及該開關之間;以及 一控制裝置,係用以根據該調光電壓產生該控制訊號,其中當該調光電壓位於該活動週期,該控制訊號係打開該開關以使該第一電容連接該第二電容,俾使該阻容電路進行充電,並俾使該開關訊號控制該功率金氧半電晶體開啟以打開該組發光二極體,當該調光電壓位於該非活動週期,該控制訊號係關閉該開關,以斷開該第一電容與該第二電容之連接,俾使該阻容電路進行放電,並俾使該開關訊號控制該功率金氧半電晶體關閉以關閉該組發光二極體。 An LED circuit includes: an inductor electrically connected to a power supply and a first node; a group of light emitting diodes electrically connected to the first node and a ground potential; a power MOS transistor, electrically connected to the first node and the ground potential; and a switching circuit electrically connected to the gate of the power MOS transistor for outputting a switching signal to turn the switch on or off a power MOS transistor, comprising: an error amplifier, generating an error output according to a dimming voltage, wherein the dimming voltage has an active period and an inactive period; a pulse width modulation a module for generating the switching signal according to the error output, controlling the charging of the group of LEDs when the power MOS transistor is turned on, and controlling the group of illuminating when the power MOS transistor is turned off a diode discharge device, comprising: at least one first capacitor; at least one second capacitor; a switch controlled by a control signal, one end of the switch being electrically connected to the first power The other end of the switch is electrically connected to the second capacitor; and an impedance element connected in series between the line error output and the second capacitor and the switch; and a control device is configured to generate the control signal according to the dimming voltage, wherein when the dimming voltage is in the active period, the control signal turns on the switch to connect the first capacitor to the second capacitor, so that the The RC circuit charges, and causes the switch signal to control the power MOS transistor to turn on to turn on the group of LEDs. When the dimming voltage is in the inactive period, the control signal turns off the switch to break The connection between the first capacitor and the second capacitor is opened, the RC circuit is discharged, and the switching signal is controlled to turn off the power MOS transistor to turn off the group of LEDs. 如請求項1所述之發光二極體電路,更包含一電容,該開關訊號係控制該功率金氧半電晶體之該閘極,以實質地對該電容進行該充電或該放電,進一步打開或關閉該組發光二極體。 The illuminating diode circuit of claim 1, further comprising a capacitor, wherein the switching signal controls the gate of the power MOS transistor to substantially perform the charging or discharging of the capacitor, further opening Or turn off the group of light-emitting diodes. 如請求項1所述之發光二極體電路,更包含一負載,係電性連接於該組發光二極體及該接地電位間,以接收該組發光二極體之一輸出電壓。 The illuminating diode circuit of claim 1, further comprising a load electrically connected between the group of light emitting diodes and the ground potential to receive an output voltage of one of the group of light emitting diodes. 如請求項3所述之發光二極體電路,其中該誤差放大器包含一非反相輸入端以及一反相輸入端,該非反相輸入端係用以接收一參考電壓,該反相輸入端係用以接收該組發光二極體之該輸出電壓,其中該參考電壓係根據該調光電壓產生,該誤差輸出係實質上根據該參考電壓及該輸出電壓產生。 The illuminating diode circuit of claim 3, wherein the error amplifier comprises a non-inverting input terminal and an inverting input terminal for receiving a reference voltage, the inverting input terminal And receiving the output voltage of the group of light emitting diodes, wherein the reference voltage is generated according to the dimming voltage, and the error output is generated substantially according to the reference voltage and the output voltage. 如請求項4所述之發光二極體電路,其中該控制裝置更包含:一比較器,用以根據該參考電壓以及一臨界電壓(threshold voltage)產生一比較結果,當該調光電壓係位於該活動週期,該參考電壓係大於該臨界電壓,以使該比較結果為一高電位,當該調光電壓係位於該非活動週期,該參考電壓係小於該臨界電壓,以使該比較結果為一低電位;以及一及閘(AND gate),用以接收該比較結果以及該調光電壓,以產生該控制訊號。 The illuminating diode circuit of claim 4, wherein the control device further comprises: a comparator for generating a comparison result according to the reference voltage and a threshold voltage, when the dimming voltage is located In the active period, the reference voltage is greater than the threshold voltage, so that the comparison result is a high potential. When the dimming voltage is in the inactive period, the reference voltage is less than the threshold voltage, so that the comparison result is one. a low potential; and an AND gate for receiving the comparison result and the dimming voltage to generate the control signal. 如請求項1所述之發光二極體電路,其中該開關電路更包含一振盪器,用以產生一振盪訊號,該脈衝寬度調變模組係實質上根據該誤差輸出以及該振盪訊號產生該開關訊號。 The illuminating diode circuit of claim 1, wherein the switching circuit further comprises an oscillator for generating an oscillating signal, the pulse width modulation module substantially generating the audible signal according to the error output and the oscillating signal Switch signal.
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