CN108811231A - Dimming Optimized LED Driver Circuit - Google Patents
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Abstract
一种调光优化发光二极管驱动电路，该调光优化发光二极管驱动电路包括：一整流电路、一线性恒流电路、一晶体管开关以及一电压调整电路。该整流电路用于将一交流电整流以提供一直流输出电压；该线性恒流电路用于驱动至少一发光二极管；该晶体管开关耦接于该整流电路以及该线性恒流电路之间；以及该电压调整电路耦接于该晶体管开关，并用于决定该晶体管开关的一栅极电压。
A dimming optimized light emitting diode driving circuit, the dimming optimized light emitting diode driving circuit comprises: a rectifier circuit, a linear constant current circuit, a transistor switch and a voltage adjustment circuit. The rectifier circuit is used to rectify an alternating current to provide a direct current output voltage; the linear constant current circuit is used to drive at least one light emitting diode; the transistor switch is coupled between the rectifier circuit and the linear constant current circuit; and the voltage adjustment circuit is coupled to the transistor switch and is used to determine a gate voltage of the transistor switch.
Description
技术领域technical field
本发明涉及一种发光二极管驱动电路，特别是关于一种调光优化发光二极管驱动电路。The invention relates to a light-emitting diode driving circuit, in particular to a dimming-optimized light-emitting diode driving circuit.
背景技术Background technique
近年来环保意识快速增长，各国纷纷提倡节能减碳等环保政策。降低照明灯具所消耗的电源即是其中一例。而目前最热门的节能灯具莫过于是发光二极管(LightEmitting Diode，LED)灯照明，它因为具有节省能源、环保、寿命长与坚固耐用等优点，正逐步取代传统灯具，并逐渐扩展至各种应用。In recent years, the awareness of environmental protection has grown rapidly, and countries have advocated environmental protection policies such as energy conservation and carbon reduction. One example is reducing the power consumed by lighting fixtures. At present, the most popular energy-saving lamps are Light Emitting Diode (LED) lamps. Because of their advantages of energy saving, environmental protection, long life and durability, they are gradually replacing traditional lamps and gradually expanding to various applications. .
请参阅图1，图1是传统的一发光二极管驱动电路100的示意图。如图1所示，发光二极管驱动电路100包括：一整流电路110以及一线性恒流电路120，其中当整流电路110提供的直流电压输出为低电压时(亦即使用者要关掉线性恒流电路120或调整线性恒流电路120中的发光二极管的亮度时)，传统的发光二极管驱动电路100关掉线性恒流电路120或调整线性恒流电路120中的发光二极管的亮度的速度很慢，使用者肉眼会很明显感受到发光二极管的亮度是慢慢变暗，因此会造成使用者体验不佳的问题。Please refer to FIG. 1 , which is a schematic diagram of a conventional LED driving circuit 100 . As shown in FIG. 1 , the LED drive circuit 100 includes: a rectifier circuit 110 and a linear constant current circuit 120, wherein when the DC voltage output provided by the rectifier circuit 110 is a low voltage (that is, the user wants to turn off the linear constant current circuit 120 or adjust the brightness of the LEDs in the linear constant current circuit 120), the traditional LED drive circuit 100 turns off the linear constant current circuit 120 or adjusts the brightness of the LEDs in the linear constant current circuit 120 very slowly, The naked eyes of the user will obviously feel that the brightness of the light-emitting diode is gradually dimming, which will cause a problem of poor user experience.
发明内容Contents of the invention
提供一种调光优化发光二极管驱动电路，可以通过优化路径使发光二极管在预期的最低亮度情况下关闭或者加快调整发光二极管的亮度的速度，达到调光优化的功能。Provided is a dimming-optimized light-emitting diode drive circuit, which can enable the light-emitting diode to be turned off at the expected minimum brightness or speed up the speed of adjusting the brightness of the light-emitting diode by optimizing the path, so as to achieve the function of dimming optimization.
为了实现上述目的，本发明提供了一种调光优化发光二极管驱动电路，该调光优化发光二极管驱动电路包括：一整流电路、一线性恒流电路、一晶体管开关以及一电压调整电路。该整流电路用于将一交流电整流以提供一直流输出电压；该线性恒流电路用于驱动至少一发光二极管；该晶体管开关耦接于该整流电路以及该线性恒流电路之间；以及该电压调整电路耦接于该晶体管开关，并用于决定该晶体管开关的一栅极电压。In order to achieve the above object, the present invention provides a dimming optimized LED drive circuit, which includes: a rectifier circuit, a linear constant current circuit, a transistor switch and a voltage adjustment circuit. The rectifier circuit is used to rectify an alternating current to provide a direct current output voltage; the linear constant current circuit is used to drive at least one light emitting diode; the transistor switch is coupled between the rectifier circuit and the linear constant current circuit; and the voltage The adjusting circuit is coupled to the transistor switch and used for determining a gate voltage of the transistor switch.
本发明的技术效果在于：Technical effect of the present invention is:
综上所述，本发明的调光优化发光二极管驱动电路可以借由一电压调整电路决定一晶体管开关的栅极电压的功能来使得关掉线性恒流电路或调整线性恒流电路中的发光二极管的亮度的速度变得较快，也就是可以通过优化路径使发光二极管在预期的最低亮度情况下关闭或者加快调整发光二极管的亮度的速度，达到调光优化的功能。To sum up, the dimming optimized LED drive circuit of the present invention can use the function of a voltage adjustment circuit to determine the gate voltage of a transistor switch to turn off the linear constant current circuit or adjust the LED in the linear constant current circuit. The speed of the brightness becomes faster, that is, the light-emitting diode can be turned off at the expected minimum brightness by optimizing the path or the speed of adjusting the brightness of the light-emitting diode can be accelerated to achieve the function of dimming optimization.
以下结合附图和具体实施例对本发明进行详细描述，但不作为对本发明的限定。The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.
附图说明Description of drawings
图1是传统的一发光二极管驱动电路的示意图；FIG. 1 is a schematic diagram of a traditional LED drive circuit;
图2是根据本发明的一实施例所绘示的一调光优化发光二极管驱动电路的示意图。FIG. 2 is a schematic diagram of a dimming-optimized LED driving circuit according to an embodiment of the present invention.
具体实施方式Detailed ways
下面结合附图对本发明的结构原理和工作原理作具体的描述：Below in conjunction with accompanying drawing, structural principle and working principle of the present invention are specifically described:
请参阅图2，图2是根据本发明的一实施例所绘示的一调光优化发光二极管驱动电路200的示意图。如图2所示，调光优化发光二极管驱动电路200包括：一整流电路202、一晶体管开关204、一电压调整电路210、一线性恒流电路220、一限流电路230、一限流斜坡斜率决定电路240、一电容250以及一二极管260，其中线性恒流电路220用于驱动至少一发光二极管。整流电路202用于将一交流电整流以提供一直流电压输出。晶体管开关204耦接于整流电路202以及线性恒流电路220之间，并且晶体管开关204为一N型金氧半场效晶体管。电压调整电路210耦接于晶体管开关204，用于决定晶体管开关204的一栅极电压，电压调整电路210可为一分压电路，该分压电路具有一第一端A、一第二端B以及一分压端C，第一端A耦接于整流电路202，第二端B耦接于二极管260的第一端，分压端C耦接于晶体管开关204的栅极，且该分压电路依据该直流输出电压于分压端C产生一分压，因此，当整流电路202提供的该直流电压输出从高电压转为低电压时(亦即使用者要关掉线性恒流电路220或调整线性恒流电路220中的发光二极管的亮度时)，调整该分压电路在分压端C所产生的该分压可使晶体管开关204的栅极电压更快地下降，而由于晶体管开关204为一N型金氧半场效晶体管，所以就可以更快地控制晶体管开关204的关闭，因此可使得关掉线性恒流电路220或调整线性恒流电路220中的发光二极管的亮度的速度变得较快，也就是可以通过优化路径使发光二极管在预期的最低亮度情况下关闭，达到调光优化的功能。在本实施例中，电压调整电路210包括：一第一阻抗212、一第二阻抗214、一电容216以及一第三阻抗218，第二阻抗214串联于第一阻抗212，电容216串联于第二阻抗214，以及第三阻抗218并联于电容216。电压调整电路210所包含的阻抗数量可依据不同设计需求而改变。Please refer to FIG. 2 . FIG. 2 is a schematic diagram of a dimming-optimized LED driving circuit 200 according to an embodiment of the present invention. As shown in FIG. 2 , the dimming optimization LED drive circuit 200 includes: a rectifier circuit 202, a transistor switch 204, a voltage adjustment circuit 210, a linear constant current circuit 220, a current limiting circuit 230, a current limiting ramp slope The decision circuit 240, a capacitor 250 and a diode 260, wherein the linear constant current circuit 220 is used to drive at least one LED. The rectification circuit 202 is used to rectify an AC power to provide a DC voltage output. The transistor switch 204 is coupled between the rectification circuit 202 and the linear constant current circuit 220 , and the transistor switch 204 is an N-type MOSFET. The voltage adjustment circuit 210 is coupled to the transistor switch 204, and is used to determine a gate voltage of the transistor switch 204. The voltage adjustment circuit 210 can be a voltage divider circuit, and the voltage divider circuit has a first terminal A and a second terminal B And a voltage divider C, the first end A is coupled to the rectifier circuit 202, the second end B is coupled to the first end of the diode 260, the voltage divider C is coupled to the gate of the transistor switch 204, and the voltage divider The circuit generates a divided voltage at the voltage dividing terminal C according to the DC output voltage. Therefore, when the DC voltage output provided by the rectifier circuit 202 changes from a high voltage to a low voltage (that is, the user will turn off the linear constant current circuit 220 or When adjusting the brightness of the light-emitting diode in the linear constant current circuit 220), adjusting the divided voltage generated by the voltage dividing circuit at the voltage dividing terminal C can make the gate voltage of the transistor switch 204 drop faster, and because the transistor switch 204 It is an N-type metal-oxide-semiconductor field-effect transistor, so it can control the closing of the transistor switch 204 faster, so the speed of turning off the linear constant current circuit 220 or adjusting the brightness of the light-emitting diode in the linear constant current circuit 220 can be changed. Faster, that is, the light-emitting diode can be turned off at the expected minimum brightness by optimizing the path, so as to achieve the function of dimming optimization. In this embodiment, the voltage adjustment circuit 210 includes: a first impedance 212, a second impedance 214, a capacitor 216 and a third impedance 218, the second impedance 214 is connected in series with the first impedance 212, and the capacitor 216 is connected in series with the second The second impedance 214 and the third impedance 218 are connected in parallel with the capacitor 216 . The number of impedances included in the voltage adjustment circuit 210 can vary according to different design requirements.
在本实施例中，线性恒流电路220包括：一第一发光二极管221、一第一阻抗222、一第一恒流器223、一二极管224、一第二阻抗225、一第二恒流器226、一第二发光二极管227、一第三阻抗228、一第三恒流器229、、一第四阻抗230、一第四恒流器231以及一第五阻抗232。第一恒流器223具有一恒流输出端1、一接地端2以及一输出电流值设置端3，其中第一恒流器223的恒流输出端1耦接于电压调整电路210，以及第一恒流器223的输出电流值设置端3耦接于第一阻抗222。二极管224耦接于第一发光二极管221，以及第二阻抗并联于二极管224。第二恒流器226具有一恒流输出端1、一接地端2以及一输出电流值设置端3，其中第二恒流器226的恒流输出端1耦接于二极管224与第一发光二极管221。第二发光二极管227耦接于第二恒流器226的输出电流值设置端3，以及第三阻抗228耦接于第二恒流器226的输出电流值设置端3。第三恒流器229具有一恒流输出端1、一接地端2以及一输出电流值设置端3，其中第三恒流器229的恒流输出端1耦接于第三阻抗228。第四阻抗230耦接于第三恒流器229的输出电流值设置端3与晶体管开关204。第四恒流器231具有一恒流输出端1、一接地端2以及一输出电流值设置端3，其中第三恒流器231的恒流输出端1耦接于第三阻抗。第五阻抗232耦接于该第四恒流器231的输出电流值设置端3与晶体管开关204。由于线性恒流电路220的操作原理与一般的线性恒流电路相仿，故不另多作描述，也因为如此，本发明的电压调整电路210与晶体管开关204可以应用于各种不同的线性恒流电路而具有同样的效果。In this embodiment, the linear constant current circuit 220 includes: a first light emitting diode 221, a first impedance 222, a first current constant device 223, a diode 224, a second impedance 225, a second current constant device 226 , a second light emitting diode 227 , a third impedance 228 , a third current regulator 229 , a fourth impedance 230 , a fourth current regulator 231 and a fifth impedance 232 . The first constant current device 223 has a constant current output terminal 1, a ground terminal 2 and an output current value setting terminal 3, wherein the constant current output terminal 1 of the first constant current device 223 is coupled to the voltage adjustment circuit 210, and the second An output current value setting terminal 3 of a current regulator 223 is coupled to the first impedance 222 . The diode 224 is coupled to the first LED 221 , and the second impedance is connected in parallel to the diode 224 . The second constant current device 226 has a constant current output terminal 1, a ground terminal 2 and an output current value setting terminal 3, wherein the constant current output terminal 1 of the second current constant device 226 is coupled to the diode 224 and the first LED 221. The second LED 227 is coupled to the output current setting terminal 3 of the second current regulator 226 , and the third impedance 228 is coupled to the output current setting terminal 3 of the second current regulator 226 . The third constant current device 229 has a constant current output terminal 1 , a ground terminal 2 and an output current value setting terminal 3 , wherein the constant current output terminal 1 of the third current constant device 229 is coupled to the third impedance 228 . The fourth impedance 230 is coupled to the output current setting terminal 3 of the third current regulator 229 and the transistor switch 204 . The fourth constant current device 231 has a constant current output terminal 1 , a ground terminal 2 and an output current value setting terminal 3 , wherein the constant current output terminal 1 of the third current constant device 231 is coupled to the third impedance. The fifth impedance 232 is coupled to the output current setting terminal 3 of the fourth current regulator 231 and the transistor switch 204 . Since the operating principle of the linear constant current circuit 220 is similar to that of general linear constant current circuits, no further description is given. Because of this, the voltage adjustment circuit 210 and the transistor switch 204 of the present invention can be applied to various linear constant current circuits. circuit has the same effect.
举例来说，假设整流电路202提供的该直流电压输出为Vi，第一阻抗212的电阻值为R1，第二阻抗214的电阻值为R2，以及一第三阻抗218的电阻值为R3，则电压调整电路210的分压端C产生的该分压等于Vi*R3/(R1+R2+R3)，换言之，当R3愈小且R1+R2愈大时，分压端C产生的该分压相对于Vi下降的幅度就愈大。由于晶体管开关204为一N型金氧半场效晶体管，所以当整流电路202提供的该直流电压输出从高电压转为低电压时(亦即使用者要关掉线性恒流电路220或调整线性恒流电路220中的发光二极管的亮度时)，本发明可借由设计R3与(R1+R2+R3)之间不同的比例来决定分压端C产生的该分压下降的幅度，也就是控制晶体管开关204的栅极电压下降的速度(亦即控制晶体管开关204的关闭速度)。因此，当使用者想要快速关掉线性恒流电路220或调整线性恒流电路220中的发光二极管的亮度时(亦即整流电路202提供的该直流电压输出从高电压转为低电压时)，本发明的调光优化发光二极管驱动电路200可以借由调整电压调整电路210在分压端C所产生的该分压使晶体管开关204的栅极电压更快地下降，而由于晶体管开关204为一N型金氧半场效晶体管，所以就可以更快地控制晶体管开关204的关闭，因此本发明可通过决定晶体管开关204的栅极电压的功能来使得关掉线性恒流电路220或调整线性恒流电路220中的发光二极管的亮度的速度变得较快，也就是可以通过优化路径使发光二极管在预期的最低亮度情况下关闭，达到调光优化的功能。For example, assuming that the DC voltage output provided by the rectifier circuit 202 is Vi, the resistance value of the first impedance 212 is R1, the resistance value of the second impedance 214 is R2, and the resistance value of a third impedance 218 is R3, then The divided voltage generated by the voltage dividing terminal C of the voltage adjusting circuit 210 is equal to Vi*R3/(R1+R2+R3), in other words, when R3 is smaller and R1+R2 is larger, the divided voltage generated by the voltage dividing terminal C Relative to Vi the greater the decline. Since the transistor switch 204 is an N-type metal-oxide-semiconductor field-effect transistor, when the DC voltage output provided by the rectifier circuit 202 changes from a high voltage to a low voltage (that is, the user turns off the linear constant current circuit 220 or adjusts the linear the brightness of the light-emitting diode in the constant current circuit 220), the present invention can determine the magnitude of the voltage divider drop generated by the voltage divider terminal C by designing the different ratios between R3 and (R1+R2+R3), that is, The speed at which the gate voltage of the transistor switch 204 drops (ie, the speed at which the transistor switch 204 is turned off) is controlled. Therefore, when the user wants to quickly turn off the linear constant current circuit 220 or adjust the brightness of the light-emitting diodes in the linear constant current circuit 220 (that is, when the DC voltage output provided by the rectifier circuit 202 changes from a high voltage to a low voltage) The dimming-optimized light-emitting diode driving circuit 200 of the present invention can make the gate voltage of the transistor switch 204 drop faster by adjusting the divided voltage generated by the voltage adjusting circuit 210 at the voltage dividing terminal C, and because the transistor switch 204 is An N-type metal-oxide-semiconductor field-effect transistor, so the closing of the transistor switch 204 can be controlled faster, so the present invention can turn off the linear constant current circuit 220 or adjust the linear constant current circuit 220 by determining the function of the gate voltage of the transistor switch 204 The brightness of the light emitting diodes in the constant current circuit 220 becomes faster, that is, the light emitting diodes can be turned off at the expected minimum brightness through an optimized path, so as to achieve the function of dimming optimization.
另外，在本实施例中，限流电路230并联于整流电路202以及线性恒流电路220之间，并用于产生一限流效果并决定一限流高度；限流电路230包括一恒流器233以及一阻抗234。恒流器233具有一恒流输出端1、一接地端2以及一输出电流值设置端3，用于产生限流效果，其中恒流输出端1耦接于限流斜坡斜率决定电路240。阻抗234耦接于输出电流值设置端3，用于决定该限流高度，其中阻抗234可为一可变阻抗。限流斜坡斜率决定电路240并联于整流电路202以及线性恒流电路220之间且串联于限流电路230，并用于决定一限流斜坡斜率；限流斜坡斜率决定电路240包括一第一阻抗242以及一第二阻抗244，用于决定该限流斜坡斜率，其中第一阻抗242或第二阻抗244可为一可变阻抗。限流斜坡斜率决定电路240所包含的阻抗数量可依据不同设计需求而改变。此外，由于限流电路230与限流斜坡斜率决定电路240的功能只在于使整体的谐波接近整流器输出的连续正弦波，而不会影响电压调整电路210的调光优化功能，因此在其他实施例中，限流电路230、限流斜坡斜率决定电路240以及二极管260都可以选择性地省略。In addition, in this embodiment, the current limiting circuit 230 is connected in parallel between the rectifying circuit 202 and the linear constant current circuit 220, and is used to generate a current limiting effect and determine a current limiting height; the current limiting circuit 230 includes a constant current device 233 and an impedance 234 . The constant current device 233 has a constant current output terminal 1 , a ground terminal 2 and an output current value setting terminal 3 for generating a current limiting effect, wherein the constant current output terminal 1 is coupled to the current limiting slope determination circuit 240 . The impedance 234 is coupled to the output current value setting terminal 3 for determining the height of the current limit, wherein the impedance 234 can be a variable impedance. The current-limiting slope determination circuit 240 is connected in parallel between the rectifier circuit 202 and the linear constant current circuit 220 and connected in series with the current-limiting circuit 230, and is used to determine a current-limiting slope; the current-limiting slope determination circuit 240 includes a first impedance 242 And a second impedance 244 for determining the slope of the current limiting ramp, wherein the first impedance 242 or the second impedance 244 can be a variable impedance. The number of impedances included in the current-limiting ramp slope determining circuit 240 may vary according to different design requirements. In addition, because the functions of the current limiting circuit 230 and the current limiting ramp slope determination circuit 240 are only to make the overall harmonics close to the continuous sine wave output by the rectifier without affecting the dimming optimization function of the voltage adjustment circuit 210, so in other implementations In one example, the current limiting circuit 230 , the current limiting ramp slope determining circuit 240 and the diode 260 can be selectively omitted.
综上所述，本发明的调光优化发光二极管驱动电路的主要技术特征在于可以借由一电压调整电路决定一晶体管开关的栅极电压的功能来使得关掉线性恒流电路或调整线性恒流电路中的发光二极管的亮度的速度变得较快，也就是可以通过优化路径使发光二极管在预期的最低亮度情况下关闭或者加快调整发光二极管的亮度的速度，达到调光优化的功能。To sum up, the main technical feature of the dimming optimized light-emitting diode drive circuit of the present invention is that the function of determining the gate voltage of a transistor switch by a voltage adjustment circuit can be used to turn off the linear constant current circuit or adjust the linear constant current The brightness of the light-emitting diodes in the circuit becomes faster, that is, the light-emitting diodes can be turned off at the expected minimum brightness by optimizing the path or the speed of adjusting the brightness of the light-emitting diodes can be accelerated to achieve the function of dimming optimization.
当然，本发明还可有其它多种实施例，在不背离本发明精神及其实质的情况下，熟悉本领域的技术人员当可根据本发明作出各种相应的改变和变形，但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.
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Application publication date: 20181113 |