CN107770910B - LED segmentation multistage dimming driving circuit - Google Patents
LED segmentation multistage dimming driving circuit Download PDFInfo
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- CN107770910B CN107770910B CN201711033697.2A CN201711033697A CN107770910B CN 107770910 B CN107770910 B CN 107770910B CN 201711033697 A CN201711033697 A CN 201711033697A CN 107770910 B CN107770910 B CN 107770910B
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- control voltage
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- toggle switch
- operational amplifier
- voltage
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- 230000011218 segmentation Effects 0.000 title claims description 5
- 238000002955 isolation Methods 0.000 claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention discloses an LED (light-emitting diode) sectional multistage dimming driving circuit, which comprises a toggle switch circuit, an operational amplifier circuit and a photoelectric coupler circuit, wherein the toggle switch circuit is composed of a plurality of groups of toggle switches connected in parallel with a voltage dividing resistor R104, each toggle switch is also connected in series with a corresponding voltage dividing resistor, an original control voltage Ua related to the on-off state of each toggle switch is formed at a control voltage forming point A, the control voltage forming point A is electrically connected with the input end of the operational amplifier circuit, the original control voltage Ua is subjected to control precision improvement by the operational amplifier circuit and then is outputted by an output end B, and the control voltage Ub is subjected to potential isolation by the photoelectric coupler circuit and then outputted to the LED driver by a driver control voltage output end C and an output end D.
Description
Technical Field
The invention relates to a driving circuit, in particular to an LED sectional multistage dimming driving circuit.
Background
In LED lighting, a constant current driving circuit is generally used to drive an LED light source, and in a constant current output LED driver circuit, as long as a given voltage value is provided to an output current control circuit, an LED driver will have a constant current driving output of a corresponding current value, referring to fig. 1, the LED light source has a constant current driving output of a DC-DC converter connected to an ac power source Vac, and when the brightness of the LED light source needs to be adjustable, an output detection and feedback circuit is generally formed by an integrated circuit, and under the control of a signal from 0 to 10 and a dimming control circuit, a controllable constant driving current output by the DC-DC converter is caused, so as to change the brightness of the LED light source.
In addition, in LED lighting, for LED light emitting components with different powers and different combinations, drivers with corresponding different currents need to be provided, so as to form LED drivers with various specifications, in order to reduce the specification variety of the LED drivers, a requirement that the output current of the drivers can be conveniently changed is proposed, and for the same LED lamp load, changing the driving current also means changing the light emitting brightness, so that changing the output current of the drivers is also often called LED dimming, and the change of the driving current can be continuous or graded as required.
As disclosed in chinese publication No. CN103269541a, an LED constant current controller integrating three output current specifications, by utilizing the flexibility of a chip dedicated to a PWMLED driver, adding resistors R12, R13, R14 and a 2-bit dial switch, three output current specifications of 350mA,700mA and 1050mA can be integrated into one product, and this design is specifically aimed at the application of the chip dedicated to the PWMLED driver firstly, and then a 2-bit dial switch used is used only in a non-isolated LED driver.
In another example, an LED driver has an isolation control circuit of a built-in dial switch disclosed in chinese publication No. cn20151320210. X, where an output end of the LED driver is connected to a dial switch circuit, the dial switch circuit is connected to a photoelectric coupler circuit, the photoelectric coupler circuit is connected to an electronic switch circuit, the electronic switch circuit is connected to a digital-to-analog conversion circuit, and the digital-to-analog conversion circuit outputs different dc voltage values according to different switch states of the dial switch circuit. The dial switch circuit is provided with n switches K1 … … Kn, which are 2 in total n The switch states control the output 2 of the D/A conversion circuit n The DC voltage value is designed by adopting a digital-to-analog conversion circuit to form a control signal.
The prior art has the defects of limitation in application, low control precision, complex circuit structure and the like, so that the design of the LED dimming driving circuit with small volume, wide application and low cost is necessary for solving the problems.
Disclosure of Invention
Aiming at the problems in the background technology, the invention provides an LED segmentation multistage dimming driving circuit, which aims at simplifying the circuit, reducing the cost and simultaneously considering the control precision and the safety.
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a LED segmentation multistage dimming drive circuit, including toggle switch circuit, operational amplifier circuit and photoelectric coupler circuit, toggle switch circuit comprises a plurality of groups and the parallelly connected toggle switch of divider resistor R104, the toggle switch of every way still establishes ties corresponding divider resistor, form the original control voltage Ua that is relevant with the break-make state of each way toggle switch in control voltage formation point A department, this control voltage formation point A is connected with operational amplifier circuit's input electricity, original control voltage Ua is by output terminal B output control voltage Ub after the operational amplifier circuit improves control accuracy, control voltage Ub is again through photoelectric coupler circuit potential isolation after, output by driver control voltage output terminal C and output terminal D to the LED driver is through the detection of potential isolation and feedback circuit output dimming control voltage Uc.
As a preferable technical scheme of the invention, the toggle switch circuit is formed by connecting a plurality of groups of toggle switches connected in series with a voltage dividing resistor in parallel on a lower voltage dividing resistor R104 of a resistor divider with 0-10V voltage, and according to the on-off state of each toggle switch, different control voltage values Ua are obtained on a control voltage forming point A, and the series N=2 of the control voltage values Ua n Wherein n is the number of ways of the toggle switch.
As a preferable embodiment of the present invention, the voltage dividing resistor R104 is connected in parallel with a filter capacitor C101.
As a preferred technical solution of the present invention, the operational amplifier circuit amplifies an original control voltage Ua obtained from a control voltage forming point a by an operational amplifier U201 connected in a negative feedback manner, and outputs a dimming control voltage Ub with improved accuracy from an output terminal B.
As a preferred solution of the present invention, an input terminal of a photo-coupler U301 in the photo-coupler circuit is connected to a dimming control voltage Ub output by the operational amplifier circuit through an isolation diode D301, and a dimming control voltage Uc having a potential isolated from an output terminal C and an output terminal D of the photo-coupler circuit is output.
As a preferable technical scheme of the invention, the toggle switch in the toggle switch circuit adopts a dial switch or other mechanical switches with on-off functions.
Compared with the prior art, the invention has the beneficial effects that: the whole circuit design of the invention brings the advantages of reduced volume and cost by reducing components through a simple circuit structure, and has higher output current control precision brought by adding an operational amplifier and use safety obtained by adopting a photoelectric coupler for potential isolation.
Drawings
FIG. 1 is a block diagram of a prior art dimming control LED driver;
FIG. 2 is a circuit diagram of a dimming controlled LED driver according to the present invention;
in the figure: 101-a toggle switch circuit; 201-an operational amplifier circuit; 301-photo-coupling circuit.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples:
referring to fig. 2, the present invention provides an LED segmented multistage dimming driving circuit, which includes a toggle switch circuit 101, an operational amplifier circuit 201 and a photo coupler circuit 301, wherein the toggle switch circuit 101 is composed of a plurality of groups of toggle switches connected in parallel with a voltage dividing resistor R104, each toggle switch is further connected in series with a corresponding voltage dividing resistor, an original control voltage Ua related to on/off states of each toggle switch is formed at a control voltage forming point a, the control voltage forming point a is electrically connected with an input end of the operational amplifier circuit 201, the original control voltage Ua is outputted by an output end B after the control accuracy of the operational amplifier circuit 201 is improved, the control voltage Ub is further electrically isolated by the photo coupler circuit 301, and the driver control voltage output end C and the output end D output the dimming control voltage Uc to an LED driver through an electrically isolated detection and feedback circuit.
Specifically, the toggle switch circuit 101 is formed by dividing the voltageA plurality of groups of toggle switches with serially connected resistors are connected in parallel on a lower voltage dividing resistor R104 of a resistor voltage divider with voltage of 0-10V, different control voltage values Ua are obtained on a control voltage forming point A according to the on-off state of each toggle switch, and the series number N=2 of the control voltage values Ua n Wherein n is the number of toggle switches, and the voltage dividing resistor R104 is connected in parallel with the filter capacitor C101.
Specifically, the operational amplifier circuit 201 amplifies the original control voltage Ua obtained from the control voltage forming point a by the operational amplifier U201 connected in a negative feedback manner, and outputs the dimming control voltage Ub with improved accuracy from the output terminal B.
Specifically, the input end of the photo-coupler U301 in the photo-coupler circuit 301 is connected to the dimming control voltage Ub output by the operational amplifier circuit 201 through an isolation diode D301, and the dimming control voltage Uc with potential isolation is output from the output end C and the output end D of the photo-coupler circuit 301.
Specifically, the toggle switch in the toggle switch circuit 101 is a dial switch or other mechanical switches with on/off functions.
In the embodiment, three paths of toggle switches K101, K102 and K103 are adopted, one ends of the three paths of toggle switches are grounded, the other ends of the three paths of toggle switches are respectively connected with one ends of voltage dividing resistors R101, R102 and R103, the other ends of the voltage dividing resistors R101, R102 and R103, one ends of voltage dividing resistors R104, R105 and a filter capacitor C101 are connected to a control voltage forming point A, the other ends of the filter capacitor C101 and the voltage dividing resistor R104 are grounded, and the other ends of the resistor R105 are connected with 0-10V voltage; in the operational amplifier circuit, a feedback resistor R202 is connected to an ' input end of an operational amplifier U201, the resistor R201 and a feedback loop are input into each end of an interference filter capacitor C201, the other end of the resistor R201 is connected to Isen, the other end of the feedback resistor R202 is connected with one end of the feedback capacitor C202, the other end of the feedback capacitor C202 is connected with an output end Vout of the operational amplifier U201 and a ' pole ' of an isolation diode D301, a ' V+ ' of the operational amplifier U201 is connected with a low-voltage direct current power supply +Vcc, and a ' V- ' of the operational amplifier U201 is grounded; in the case of an optocoupler circuit,the "+" pole of the isolation diode D301 is connected with one end of R301 and the input end 2 of the photoelectric coupler U301, the input end 1 of the photoelectric coupler U301 is connected with one end of a resistor R302, the other ends of the resistor R302 and the resistor R301 are respectively connected with a low-voltage self-flowing power +Vcc, the output end 3 of the photoelectric coupler U301 is connected with one end of a capacitor C301 to a point C, the output end 4 of the photoelectric coupler U301 is connected with the other end of the capacitor C301 and the grounding point D in the driver, the precision of the output from the point C and the point D is improved, the potential isolation dimming control voltage Uc is connected with the output detection feedback circuit of the driver, the required driving current value of the final LED is formed, the required dimming level is determined by the bit number of a toggle switch, and the n-bit toggle switch can obtain 2 n The number of the light modulation level, the number of the toggle switch is increased or decreased, the required light modulation level can be selected, and the embodiment adopts 3 paths of toggle switches, so that 2 can be obtained 3 I.e. 8 on and off output states, i.e. 8 dimming levels.
In addition, the toggle switch in the toggle switch circuit 101 may be a dial switch or other mechanical switches with on/off functions.
Based on the above, the invention has the advantages that: the whole circuit design of the invention brings the advantages of reduced volume and cost by reducing components through a simple circuit structure, and has higher output current control precision brought by adding an operational amplifier and use safety obtained by adopting a photoelectric coupler for potential isolation.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (2)
1. An LED segmentation multistage dimming drive circuit which is characterized in that: the LED driver comprises a toggle switch circuit, an operational amplifier circuit and a photoelectric coupler circuit, wherein the toggle switch circuit consists of a plurality of groups of toggle switches which are connected in parallel with voltage dividing resistors, the corresponding voltage dividing resistors are connected in series with each toggle switch, an original control voltage Ua related to the on-off state of each toggle switch is formed at a control voltage forming point A, the control voltage forming point A is electrically connected with the input end of the operational amplifier circuit, the original control voltage Ua is subjected to control precision improvement by the operational amplifier circuit, then the control voltage Ub is output by an output end B, and after the control voltage Ub is subjected to potential isolation by the photoelectric coupler circuit, the dimming control voltage Uc is output to the LED driver by a driver control voltage output end C and an output end D through a potential isolation detection and feedback circuit;
the toggle switch circuit is formed by connecting a plurality of groups of toggle switches connected in series with a voltage dividing resistor in parallel on the lower voltage dividing resistor of a resistor voltage divider with the voltage of 0-10V, and different control voltage values Ua are obtained on a control voltage forming point A according to the on-off state of each toggle switch, wherein the number of stages N=2 of the control voltage values Ua n Wherein n is the number of paths of the toggle switch;
the voltage dividing resistor is connected with a filter capacitor in parallel;
the operational amplifier circuit amplifies an original control voltage Ua obtained by a control voltage forming point A and is connected with the operational amplifier circuit in a negative feedback mode, and then the dimming control voltage Ub with improved precision is output from an output end B;
the input end of the photoelectric coupler in the photoelectric coupler circuit is connected to the dimming control voltage Ub output by the operational amplifier circuit through an isolation diode, and the dimming control voltage Uc with potential isolation is output from the output end C and the output end D of the photoelectric coupler circuit.
2. The LED segment multi-level dimming driving circuit of claim 1, wherein: the toggle switch in the toggle switch circuit adopts a dial switch or other mechanical switches with on-off functions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711033697.2A CN107770910B (en) | 2017-10-30 | 2017-10-30 | LED segmentation multistage dimming driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711033697.2A CN107770910B (en) | 2017-10-30 | 2017-10-30 | LED segmentation multistage dimming driving circuit |
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| Publication Number | Publication Date |
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| CN107770910A CN107770910A (en) | 2018-03-06 |
| CN107770910B true CN107770910B (en) | 2024-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711033697.2A Active CN107770910B (en) | 2017-10-30 | 2017-10-30 | LED segmentation multistage dimming driving circuit |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109168215B (en) * | 2018-09-04 | 2021-01-15 | 广东明丰电源电器实业有限公司 | Dimming circuit based on multichannel control |
| CN110602834A (en) * | 2019-10-17 | 2019-12-20 | 上海芯荃微电子科技有限公司 | Circuit and method for controlling brightness of emergency lighting lamp by using switch |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6339298B1 (en) * | 2000-05-15 | 2002-01-15 | General Electric Company | Dimming ballast resonant feedback circuit |
| CN203193958U (en) * | 2013-02-08 | 2013-09-11 | 深圳市虹林辉科技有限公司 | Constant voltage dimmable LED power supply |
| CN205232541U (en) * | 2015-12-14 | 2016-05-11 | 上海互兴科技股份有限公司 | LED driver embeds dial switch isolation control circuit |
| CN105992441A (en) * | 2015-02-27 | 2016-10-05 | 赛尔富电子有限公司 | LED dimming power supply |
| CN207340246U (en) * | 2017-10-30 | 2018-05-08 | 上海阿卡得电子有限公司 | A kind of multistage dimming driving circuit of LED segmentations |
-
2017
- 2017-10-30 CN CN201711033697.2A patent/CN107770910B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6339298B1 (en) * | 2000-05-15 | 2002-01-15 | General Electric Company | Dimming ballast resonant feedback circuit |
| CN203193958U (en) * | 2013-02-08 | 2013-09-11 | 深圳市虹林辉科技有限公司 | Constant voltage dimmable LED power supply |
| CN105992441A (en) * | 2015-02-27 | 2016-10-05 | 赛尔富电子有限公司 | LED dimming power supply |
| CN205232541U (en) * | 2015-12-14 | 2016-05-11 | 上海互兴科技股份有限公司 | LED driver embeds dial switch isolation control circuit |
| CN207340246U (en) * | 2017-10-30 | 2018-05-08 | 上海阿卡得电子有限公司 | A kind of multistage dimming driving circuit of LED segmentations |
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| CN107770910A (en) | 2018-03-06 |
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