CN107896406B - Synchronous dimming driving circuit - Google Patents
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Abstract
Description
技术领域technical field
本发明涉及一种电子领域，特别是调光驱动电路。The invention relates to the electronic field, in particular to a dimming driving circuit.
背景技术Background technique
传统的调光驱动电路，可采用一驱动模块，还至少包括第一灯组和第二灯组，第一灯组的一端与外部电源电性连接，第一灯组的另一端分别与第二灯组的一端、驱动模块电性连接，第二灯组的另一端与驱动模块电性连接，驱动模块与外部电源电性连接并且检测外部电源输入到第一灯组的调光电压，驱动模块能够分别控制连接第一灯组的端口、第二灯组的端口导通，从而驱动模块能够根据调光电压控制第一灯组导通运作或者第一灯组、第二灯组串联导通运作，然而在调光电压变化的过程中，在调光电压较低的情况下第一灯组先亮，在调光电压升高的过程中，亮度变高，最终超过阈值时，驱动模块再控制第一灯组和第二灯组串联，此结构不能控制第一灯组和第二灯组同步运行，只能是先由一个灯组点亮，再在电压升高的过程中逐步点亮其他的灯组，使得发光效果不佳。A traditional dimming driving circuit can adopt a driving module, and at least include a first lamp group and a second lamp group, one end of the first lamp group is electrically connected to an external power supply, and the other end of the first lamp group is connected to the second lamp group respectively. One end of the lamp group is electrically connected to the driving module, the other end of the second lamp group is electrically connected to the driving module, the driving module is electrically connected to the external power supply and detects the dimming voltage input from the external power supply to the first lamp group, and the driving module The port connected to the first lamp group and the port connected to the second lamp group can be separately controlled to conduct, so that the drive module can control the conduction operation of the first lamp group or the series conduction operation of the first lamp group and the second lamp group according to the dimming voltage , however, in the process of changing the dimming voltage, the first lamp group lights up first when the dimming voltage is low, and the brightness becomes higher when the dimming voltage rises, and finally exceeds the threshold value, the drive module controls The first lamp group and the second lamp group are connected in series. This structure cannot control the synchronous operation of the first lamp group and the second lamp group. It can only be lit by one lamp group first, and then gradually light up the other lamps during the voltage increase. The light group makes the luminous effect not good.
发明内容Contents of the invention
为解决上述技术问题，本发明的目的是提供一种能够使若干条灯组同步运行的调光驱动电路。In order to solve the above technical problems, the object of the present invention is to provide a dimming driving circuit capable of synchronously operating several lamp groups.
本发明采用的技术方案是：The technical scheme adopted in the present invention is:
一种同步调光驱动电路，至少包括第一灯组和第二灯组以及驱动模块，所述第一灯组的一端与外部电源电性连接，所述第一灯组的另一端与驱动模块电性连接，所述第二灯组的另一端与驱动模块电性连接，驱动模块与外部电源电性连接并且检测外部电源输入到第一灯组的调光电压；A synchronous dimming drive circuit, comprising at least a first lamp group, a second lamp group and a drive module, one end of the first lamp group is electrically connected to an external power supply, and the other end of the first lamp group is connected to the drive module Electrically connected, the other end of the second lamp group is electrically connected to the driving module, and the driving module is electrically connected to the external power supply and detects the dimming voltage input from the external power supply to the first lamp group;
还包括第一恒流模块，第一恒流模块的一端与第一灯组的一端电性连接；第一恒流模块的另外端分别与第一灯组的另一端、第二灯组的一端、驱动模块电性连接，第一恒流模块能够根据调光电压的大小实现截止或者导通；It also includes a first constant current module, one end of the first constant current module is electrically connected to one end of the first lamp group; the other end of the first constant current module is respectively connected to the other end of the first lamp group and one end of the second lamp group , The drive module is electrically connected, and the first constant current module can be cut off or turned on according to the magnitude of the dimming voltage;
驱动模块与第一恒流模块相互配合以实现能够根据调光电压大小来切换第一灯组和第二灯组串联运行或者第一灯组和第二灯组并联运行的状态。The driving module cooperates with the first constant current module to realize switching between the first lamp group and the second lamp group operating in series or the first lamp group and the second lamp group operating in parallel according to the dimming voltage.
所述驱动模块包括检测端、控制单元、与第一灯组对应的第一开关、与第二灯组对应的第二开关；The drive module includes a detection terminal, a control unit, a first switch corresponding to the first lamp group, and a second switch corresponding to the second lamp group;
检测端与外部电源电性连接以检测调光电压；The detection terminal is electrically connected with the external power supply to detect the dimming voltage;
第一开关的一端分别与第一灯组的另一端、第一恒流模块的另外端、第二灯组的一端电性连接，第一开关的另一端接地；One end of the first switch is electrically connected to the other end of the first lamp group, the other end of the first constant current module, and one end of the second lamp group, and the other end of the first switch is grounded;
第二开关的一端与第二灯组的另一端电性连接，第二开关的另一端接地；One end of the second switch is electrically connected to the other end of the second lamp group, and the other end of the second switch is grounded;
所述控制单元分别与检测端、第一开关、第二开关电性连接以根据调光电压分别控制第一开关、第二开关截止或者导通。The control unit is electrically connected to the detection terminal, the first switch, and the second switch to respectively control the first switch and the second switch to be turned off or turned on according to the dimming voltage.
所述第一恒流模块包括第一恒流芯片、二极管D2以及参考电阻R6；The first constant current module includes a first constant current chip, a diode D2 and a reference resistor R6;
第一灯组的正极分别与第一恒流芯片的一端、外部电源电性连接；The anode of the first lamp group is electrically connected to one end of the first constant current chip and an external power supply respectively;
第一灯组的负极分别与二极管D2的正极、第一开关的一端电性连接；The negative electrode of the first lamp group is electrically connected to the positive electrode of the diode D2 and one end of the first switch;
二极管D2的负极分别与第一恒流芯片的另一端、参考电阻R6的一端电性连接；The cathode of the diode D2 is electrically connected to the other end of the first constant current chip and one end of the reference resistor R6 respectively;
参考电阻R6的另一端与第二灯组的正极电性连接；The other end of the reference resistor R6 is electrically connected to the positive pole of the second lamp group;
第二灯组的负极与第二开关的一端电性连接。The negative electrode of the second lamp group is electrically connected with one end of the second switch.
还包括第二恒流模块以及第三灯组，所述驱动模块还包括由控制单元控制截止或者导通的第三开关，所述第二恒流模块的一端与第二灯组的一端电性连接，所述第二恒流模块的另外端分别与第二灯组的另一端、第三灯组的一端、第二开关的一端电性连接，第三灯组的另一端与第三开关的一端电性连接，第三开关的另一端接地，第二恒流模块能够根据调光电压的大小实现截止或者导通。It also includes a second constant current module and a third lamp group. The drive module also includes a third switch that is controlled to be turned off or on by the control unit. One end of the second constant current module is electrically connected to one end of the second lamp group. The other end of the second constant current module is electrically connected to the other end of the second lamp group, one end of the third lamp group, and one end of the second switch, and the other end of the third lamp group is connected to the third switch. One end is electrically connected, the other end of the third switch is grounded, and the second constant current module can be turned off or turned on according to the magnitude of the dimming voltage.
所述第二恒流模块包括第二恒流芯片、二极管D3、以及参考电阻R8；The second constant current module includes a second constant current chip, a diode D3, and a reference resistor R8;
第二灯组的正极与第二恒流芯片的一端电性连接；The anode of the second lamp group is electrically connected to one end of the second constant current chip;
第二灯组的负极分别与二极管D3的正极、第二开关的一端电性连接；The negative electrode of the second lamp group is electrically connected to the positive electrode of the diode D3 and one end of the second switch;
二极管D3的负极分别与第二恒流芯片的另一端、参考电阻R8的一端电性连接；The cathode of the diode D3 is electrically connected to the other end of the second constant current chip and one end of the reference resistor R8 respectively;
参考电阻R8的另一端与第三灯组的正极电性连接；The other end of the reference resistor R8 is electrically connected to the positive pole of the third lamp group;
第三灯组的负极与第三开关的一端电性连接。The negative electrode of the third lamp group is electrically connected with one end of the third switch.
还包括整流模块，该整流模块与外部电源电性连接以在整流处理后为第一灯组、第二灯组供电。It also includes a rectification module, the rectification module is electrically connected with the external power supply to supply power to the first lamp group and the second lamp group after rectification processing.
还包括调压模块，该调压模块分别与整流模块、第一灯组电性连接以输出调光电压。It also includes a voltage regulation module, which is electrically connected with the rectification module and the first lamp group to output the dimming voltage.
本发明的有益效果：Beneficial effects of the present invention:
本发明同步调光驱动电路，在调光电压较低的情况下，第一恒流模块导通，第一灯组与第一恒流模块、第二灯组组成的串路并联，在驱动模块控制下，一路电流从第一灯组流过，另一路电流从第一恒流模块、第二灯组流过，第一灯组、第二灯组均点亮，并且在调光电压逐步增大的过程中，调节第一灯组、第二灯组的亮度，在调光电压增大到阈值，第一恒流模块截止，第一灯组、第二灯组串联，使得流过的电流不至于过大，从而提高了调光电压可调范围，各个灯组都能够同步运行，有较好的发光效果。In the synchronous dimming drive circuit of the present invention, when the dimming voltage is low, the first constant current module is turned on, and the first lamp group is connected in parallel with the series circuit composed of the first constant current module and the second lamp group. Under control, one current flows through the first lamp group, and the other current flows through the first constant current module and the second lamp group, both the first lamp group and the second lamp group are lit, and when the dimming voltage gradually increases During the large process, the brightness of the first lamp group and the second lamp group is adjusted. When the dimming voltage increases to the threshold value, the first constant current module is cut off, and the first lamp group and the second lamp group are connected in series, so that the current flowing It will not be too large, thereby increasing the adjustable range of the dimming voltage, and each lamp group can run synchronously, and has a better luminous effect.
附图说明Description of drawings
下面结合附图对本发明的具体实施方式做进一步的说明。The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
图1是本发明调光驱动电路的电路示意图。FIG. 1 is a schematic circuit diagram of the dimming driving circuit of the present invention.
具体实施方式Detailed ways
如图1所示，本发明调光驱动电路，至少包括第一灯组1和第二灯组2以及驱动模块5，此处还可以包括第三灯组3、第四灯组4，甚至更多，此处的第一灯组1可以有一个LED芯片构成，也可以由若干LED芯片依次串联而成，第一灯组1的一端与外部电源电性连接，第一灯组1的另一端与驱动模块5电性连接，所述第二灯组2的另一端与驱动模块5电性连接，驱动模块5与外部电源电性连接并且检测外部电源输入到第一灯组1的调光电压；As shown in Fig. 1, the dimming driving circuit of the present invention at least includes the first lamp group 1, the second lamp group 2 and the driving module 5, and here may also include the third lamp group 3, the fourth lamp group 4, and even more Many, the first lamp group 1 here can be composed of one LED chip, or it can be composed of several LED chips in series. One end of the first lamp group 1 is electrically connected to an external power supply, and the other end of the first lamp group 1 It is electrically connected to the driving module 5, and the other end of the second lamp group 2 is electrically connected to the driving module 5. The driving module 5 is electrically connected to the external power supply and detects the dimming voltage input from the external power supply to the first lamp group 1. ;
本设计还包括第一恒流模块11，第一恒流模块11的一端与第一灯组1的一端电性连接；第一恒流模块11的另一端分别与第一灯组1的另一端、第二灯组2的一端、驱动模块5电性连接，第一恒流模块11能够根据调光电压的大小实现截止或者导通；This design also includes a first constant current module 11, one end of the first constant current module 11 is electrically connected to one end of the first lamp group 1; the other end of the first constant current module 11 is connected to the other end of the first lamp group 1 1. One end of the second lamp group 2 is electrically connected to the driving module 5, and the first constant current module 11 can be turned off or turned on according to the dimming voltage;
驱动模块5与第一恒流模块11相互配合以实现能够根据调光电压大小来切换第一灯组1和第二灯组2串联运行或者第一灯组1和第二灯组2并联运行的状态。The driving module 5 cooperates with the first constant current module 11 to realize the ability to switch the series operation of the first lamp group 1 and the second lamp group 2 or the parallel operation of the first lamp group 1 and the second lamp group 2 according to the dimming voltage. state.
其中，本设计可包括整流模块6，该整流模块6与外部电源电性连接以在整流处理后为第一灯组1、第二灯组2供电，同时还包括调压模块7，此处的调压模块7可以是常规的调压开关电源，该调压模块7分别与整流模块6、第一灯组1电性连接，用户可通过调压模块7设定输出相应的调光电压。Among them, this design may include a rectification module 6, which is electrically connected to an external power supply to supply power to the first lamp group 1 and the second lamp group 2 after the rectification process, and also includes a voltage regulation module 7, here The voltage regulating module 7 can be a conventional voltage regulating switching power supply, and the voltage regulating module 7 is electrically connected with the rectifying module 6 and the first lamp group 1 respectively, and the user can set and output a corresponding dimming voltage through the voltage regulating module 7 .
进一步，驱动模块5包括检测端51、控制单元52、与第一灯组1对应的第一开关53、与第二灯组2对应的第二开关54；Further, the driving module 5 includes a detection terminal 51, a control unit 52, a first switch 53 corresponding to the first lamp group 1, and a second switch 54 corresponding to the second lamp group 2;
检测端51与外部电源电性连接以检测调光电压；The detection terminal 51 is electrically connected to the external power supply to detect the dimming voltage;
第一开关53的一端分别与第一灯组1的另一端、第二灯组2的一端、第一恒流模块11的另一端电性连接，第一开关53的另一端接地；One end of the first switch 53 is electrically connected to the other end of the first lamp group 1, one end of the second lamp group 2, and the other end of the first constant current module 11, and the other end of the first switch 53 is grounded;
第二开关54的一端与第二灯组1的另一端电性连接，第二开关54的另一端接地；One end of the second switch 54 is electrically connected to the other end of the second lamp group 1, and the other end of the second switch 54 is grounded;
所述控制单元52分别与检测端51、第一开关53、第二开关54电性连接以根据调光电压分别控制第一开关53、第二开关54截止或者导通。The control unit 52 is electrically connected to the detection terminal 51 , the first switch 53 and the second switch 54 to respectively control the first switch 53 and the second switch 54 to be turned off or turned on according to the dimming voltage.
第一恒流模块11包括第一恒流芯片111、二极管D2以及参考电阻R6；The first constant current module 11 includes a first constant current chip 111, a diode D2 and a reference resistor R6;
第一灯组1的正极分别与第一恒流芯片111的一端、外部电源电性连接；The anode of the first lamp group 1 is electrically connected to one end of the first constant current chip 111 and an external power supply;
第一灯组1的负极分别与二极管D2的正极、第一开关53的一端电性连接；The cathode of the first lamp group 1 is electrically connected to the anode of the diode D2 and one end of the first switch 53 respectively;
二极管D2的负极分别与第一恒流芯片111的另一端、参考电阻R6的一端电性连接；The cathode of the diode D2 is electrically connected to the other end of the first constant current chip 111 and one end of the reference resistor R6 respectively;
参考电阻R6的另一端与第二灯组2的正极电性连接；The other end of the reference resistor R6 is electrically connected to the positive pole of the second lamp group 2;
第二灯组2的负极与第二开关54的一端电性连接。The negative electrode of the second lamp group 2 is electrically connected to one end of the second switch 54 .
此处，驱动模块5可以是ES105恒流芯片，检测端51检测外部输出的电压大小，相应的控制单元52由若干个比较器构成，进而根据电压大小控制第一开关53、第二开关54导通，从而使得连接第一开关53的第一灯组1串路、连接第二开关53的第二灯组2串路导通，同时调光电压作用在第一灯组1和第二灯组2上，当调光电压上升到一定的阈值，使得通过第一恒流芯片111的电流增大，从而流过参考电阻R6的电流增大，第一恒流芯片111检测参考电阻R6端电压升高到一定值，第一恒流芯片111截止，在调光电压较低时，第一开关53、第二开关54、第一恒流芯片111均导通，由于二极管D2的作用，使得第一灯组1与第一恒流芯片111、第二灯组2构成的串路并联，在调光电压上升到一定值，第一开关53关断，第一恒流芯片111截止，第一灯组1与第二灯组2成串联，电流流过第一灯组1、第二灯组2后从第二开关54流出。Here, the drive module 5 can be an ES105 constant current chip, the detection terminal 51 detects the voltage of the external output, and the corresponding control unit 52 is composed of several comparators, and then controls the first switch 53 and the second switch 54 according to the voltage. so that the first lamp group 1 series connected to the first switch 53 and the second lamp group 2 series connected to the second switch 53 are turned on, and the dimming voltage acts on the first lamp group 1 and the second lamp group 2, when the dimming voltage rises to a certain threshold, the current passing through the first constant current chip 111 increases, so that the current flowing through the reference resistor R6 increases, and the first constant current chip 111 detects that the voltage at the terminal of the reference resistor R6 rises. When it reaches a certain value, the first constant current chip 111 is cut off. When the dimming voltage is low, the first switch 53, the second switch 54, and the first constant current chip 111 are all turned on. Due to the effect of the diode D2, the first The lamp group 1 is connected in parallel with the series circuit formed by the first constant current chip 111 and the second lamp group 2. When the dimming voltage rises to a certain value, the first switch 53 is turned off, the first constant current chip 111 is turned off, and the first lamp group 1 is in series with the second lamp group 2 , the current flows through the first lamp group 1 and the second lamp group 2 and then flows out from the second switch 54 .
在调光电压较低的情况下，第一恒流模块11导通，第一灯组1与第一恒流模块11、第二灯组2组成的串路并联，在驱动模块5控制下，一路电流从第一灯组1流过，另一路电流从第一恒流模块11、第二灯组2流过，第一灯组1、第二灯组2均点亮，并且在调光电压逐步增大的过程中，调节第一灯组1、第二灯组2的亮度，在调光电压增大到阈值，第一恒流模块11截止，第一灯组1、第二灯组2串联，使得流过的电流不至于过大，从而提高了调光电压可调范围，各个灯组都能够同步运行，有较好的发光效果，同时第一灯组1和第二灯组2可以是不同色温的灯组，从而还可实现调色功能。When the dimming voltage is low, the first constant current module 11 is turned on, and the first lamp group 1 is connected in parallel with the series circuit composed of the first constant current module 11 and the second lamp group 2. Under the control of the driving module 5, One current flows through the first lamp group 1, and the other current flows through the first constant current module 11 and the second lamp group 2. Both the first lamp group 1 and the second lamp group 2 are lit, and at the dimming voltage In the process of gradually increasing, the brightness of the first lamp group 1 and the second lamp group 2 is adjusted. When the dimming voltage increases to the threshold value, the first constant current module 11 is turned off, and the first lamp group 1 and the second lamp group 2 Connected in series, so that the current flowing will not be too large, thereby increasing the adjustable range of the dimming voltage, each lamp group can run synchronously, and has a better luminous effect. At the same time, the first lamp group 1 and the second lamp group 2 can It is a group of lamps with different color temperatures, which can also realize the function of color adjustment.
进一步地，本设计还包括第二恒流模块21以及第三灯组3，所述驱动模块5还包括由控制单元52控制截止或者导通的第三开关55，所述第二恒流模块21的一端与第二灯组2的一端电性连接，所述第二恒流模块21的另一端分别与第二灯组2的另一端、第三灯组3的一端、第二开关54的一端电性连接，第三灯组3的另一端与第三开关55的一端电性连接，第三开关55的另一端接地，第二恒流模块21能够根据调光电压的大小实现截止或者导通。Further, this design also includes a second constant current module 21 and a third lamp group 3, the driving module 5 also includes a third switch 55 controlled by the control unit 52 to turn off or on, the second constant current module 21 One end of the second constant current module 21 is electrically connected to one end of the second lamp group 2, and the other end of the second constant current module 21 is respectively connected to the other end of the second lamp group 2, one end of the third lamp group 3, and one end of the second switch 54. Electrically connected, the other end of the third lamp group 3 is electrically connected to one end of the third switch 55, the other end of the third switch 55 is grounded, and the second constant current module 21 can be turned off or turned on according to the magnitude of the dimming voltage .
第二恒流模块21包括第二恒流芯片211、二极管D3、以及参考电阻R8；The second constant current module 21 includes a second constant current chip 211, a diode D3, and a reference resistor R8;
第二灯组2的正极与第二恒流芯片211的一端电性连接；The anode of the second lamp group 2 is electrically connected to one end of the second constant current chip 211;
第二灯组2的负极分别与二极管D3的正极、第二开关54的一端电性连接；The cathode of the second lamp group 2 is electrically connected to the anode of the diode D3 and one end of the second switch 54 respectively;
二极管D3的负极分别与第二恒流芯片211的另一端、参考电阻R8的一端电性连接；The cathode of the diode D3 is electrically connected to the other end of the second constant current chip 211 and one end of the reference resistor R8 respectively;
参考电阻R8的另一端与第三灯组3的正极电性连接；The other end of the reference resistor R8 is electrically connected to the anode of the third lamp group 3;
第三灯组3的负极与第三开关55的一端电性连接。The negative electrode of the third lamp group 3 is electrically connected to one end of the third switch 55 .
以上所述仅为本发明的优先实施方式，本发明并不限定于上述实施方式，只要以基本相同手段实现本发明目的的技术方案都属于本发明的保护范围之内。The above descriptions are only preferred implementations of the present invention, and the present invention is not limited to the above-mentioned implementations, as long as the technical solutions that achieve the purpose of the present invention by basically the same means fall within the protection scope of the present invention.
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