CN117881034A - Direct-current power supply LED lighting system and use method - Google Patents
Direct-current power supply LED lighting system and use method Download PDFInfo
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Abstract
The invention provides a direct-current power supply LED lighting system and a use method thereof, wherein the lighting system comprises a direct-current constant-voltage power supply, a power supply control module, a constant-current drive, a self-learning dimming module and an LED light source; the direct-current constant-voltage power supply is connected in series with the main circuit of the lighting system, and the LED light source is connected in series with the main circuit through the branch circuit; the output end of the power supply control module outputs a control signal to control the switch of the direct-current constant-voltage power supply and regulate the voltage output by the direct-current constant-voltage power supply; the constant current drive is arranged on a branch circuit between the LED light source and the main circuit to provide constant current output for the LED light source; the input end of the self-learning dimming module monitors the voltage output by the direct-current constant-voltage power supply, and the output end outputs a dimming signal to dim the LED light source. The invention generates a group of optimal voltage dimming sequences for each end LED light source, and solves the problem that dimming can not be carried out according to a unified voltage signal due to line voltage drop or dimming can be carried out according to the unified voltage only by a very wide voltage interval.
Description
Technical Field
The invention relates to the field of lighting systems, in particular to a direct-current power supply LED lighting system and a using method thereof.
Background
At present, an intelligent controller is added on a lamp cap to intelligently control a street lamp, a tunnel lamp and the like, and the lamp controller can intelligently adjust an LED driving power supply by receiving and analyzing a specification of a terminal. The lamp controller and the terminal adopt ZigBee, carrier wave, cat1 or DALI and the like as communication signals. The above-described technique has the following problems: 1) The ZigBee communication module has small transmitting power, is easy to be shielded, and has poor stability; 2) The carrier communication is easy to be interfered by various high-frequency signals in the line, and has high cost and poor reliability; 3) Cat1 communication needs to be carried out by means of a base station of an operator, so that the construction cost and the operation cost are high; 4) The DALI needs to lay a special communication line, and has complex engineering, high construction cost and high maintenance cost.
The invention patent application No. 201010124833.0 discloses a device for energy conversion and energy-saving control of an LED street lamp, which adopts direct-current constant-voltage power supply and realizes the control of the LED street lamp by outputting a voltage value. The method controls the LED street lamp by using a method for adjusting the output voltage of the direct current conversion device. However, in a real lighting system, a dc power supply needs to supply power to hundreds of street lamps (light sources) on a section of road, the line is about thousands of meters long, due to the existence of line loss, the power supply voltages can differ by tens of volts from the first street lamp close to the dc conversion device to the farthest street lamp, the street lamps regulate the output current through the respective input voltages, and the brightness of the street lamps on the whole section of road can be different, and the brightness can be darker as the street lamps are farther from the dc conversion device. When serious, some street lamps are on, and some street lamps are not on. The control is unreliable. In order to solve the problem that the voltage on the power supply line gradually drops, the scheme proposes that the voltage between 100V and 400V is used as a dimming control signal, the street lamp power supply driver has to adapt to a very wide input voltage range, and therefore, each light source side also needs to perform secondary conversion on the voltage, and the device cost is high.
The invention patent application No. 201110277122 discloses a direct-current high-voltage power supply LED street lamp system and a control signal transmission receiving method thereof, wherein the system comprises a central direct-current power supply cabinet and an LED street lamp connected by wires; the method comprises the following steps: the central direct current power supply cabinet is powered at a first high voltage through an electric wire; the central direct current power cabinet supplies power at a second high voltage and for a first duration through wires and transmits data '1'; the central dc power cabinet is powered at a second high voltage and for a second duration by wire and transmits a data "0". The scheme is that the rising edge and the falling edge of the voltage change are judged to identify and convert the voltage change into digital 0 and 1 signals, a high-speed sampling chip is needed, and the high-cost and low-frequency interference influence is easily realized; the fixed voltage is used as the first high voltage and the second high voltage, but the power supply voltage of each street lamp unit is different due to line loss in engineering, so that it is difficult to ensure that each light source can receive signals; in addition, if the information quantity to be transmitted for realizing multi-gear dimming and electrodeless dimming is large, high-frequency switching is required between the first high voltage and the second high voltage, and the complexity and the cost of system realization are greatly increased.
The invention patent application 201410032298.4 discloses a control method and a system for controlling an LED street lamp based on a power supply circuit, which are characterized in that a group of voltage sequences are output by adopting a control power supply, the relative amplitude changes of the voltage sequences are analyzed at the tail end to generate corresponding '0' -1 'communication signals, and then the corresponding' 0 '-1' communication signals are finally converted into dimming instructions driven by edge DC/DC through a custom communication protocol. This solution has the following drawbacks: 1) The generation of the voltage sequence depends on frequent regulation of the voltage of the power supply, the change of the voltage of the power supply is physically delayed to a certain extent, and a gradual change process exists; 2) The analysis of the terminal voltage sequence requires a chip with high-speed sampling and a high-performance computing chip, and the realization cost is high.
In view of the various problems associated with the conventional dimming lighting systems, there is a need for a dc powered LED lighting system and a method of use that overcome the above problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a direct current power supply LED lighting system and a using method thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in one aspect, the present invention provides a direct current powered LED lighting system.
A direct-current power supply LED lighting system comprises a direct-current constant-voltage power supply, a power supply control module, a constant-current drive, a self-learning dimming module and an LED light source; the direct-current constant-voltage power supply is connected in series to a main circuit of the lighting system and used for providing direct-current output for the lighting system, and the LED light sources are connected in series to the main circuit through the branch circuits; the output end of the power supply control module outputs a control signal to control the switch of the direct-current constant-voltage power supply and regulate the voltage output by the direct-current constant-voltage power supply; the constant current drive is arranged on a branch circuit between each LED light source and the main circuit and is used for providing constant current output for the LED light sources; the input end of the self-learning Xi Diaoguang module monitors the voltage output by the direct-current constant-voltage power supply, and the output end of the self-learning Xi Diaoguang module outputs a dimming signal to dim the LED light source.
In another aspect, the invention provides a method of using a DC powered LED lighting system.
The use method of the direct current power supply LED lighting system comprises a training mode and an operation mode, wherein the training mode is used for setting or resetting a voltage dimming list in each self-learning dimming module; the running mode is used for controlling the direct-current constant-voltage power supply to output different voltage regulating constant-current driving output values, so that the brightness of the lighting system is regulated.
Further, the training mode includes the steps of:
step one, a power control module generates a signal for entering a training mode by turning off and on a direct-current constant-voltage power supply and generating a twice appointed voltage difference in an appointed time; after the self-learning dimming module monitors the power-off event of the power control module, the sub-circuit voltage is monitored, the difference value of the two voltages in the appointed time is found through a big data learning mode, and when the difference value is larger than a default value, the lighting system enters a training mode;
step two, after a training mode is entered, the power supply control module controls the direct-current constant-voltage power supply to uniformly output a group of voltage values, each self-learning dimming module finds out the voltage value which corresponds to the most stable output of the sub-circuit in a stipulated time in a big data learning mode, when the difference value between the voltage value and the last stable voltage value reaches the stipulated value, the self-learning Xi Diaoguang module dims the constant-current drive to enable the output to drop by a certain proportion, and after the voltage of the sub-circuit is re-stabilized, the stabilized voltage value is recorded in a voltage dimming sequence; a group of voltage dimming sequences are obtained after multiple training;
and thirdly, automatically exiting the training mode after entering the training mode for a preset time by the lighting system.
In the first step, the power control module generates a signal for entering the training mode by turning off and turning on the dc constant voltage power supply and generating a voltage difference of 20V twice within 4 seconds.
Further, in the first step, after the self-learning Xi Diaoguang module monitors the power-off event of the power control module, the sub-circuit voltage is monitored for 0.5 seconds/time, a difference value between the two voltages within 5 seconds is found by a clustering method, and when the difference value is greater than 30V, the lighting system enters a training mode.
In the second step, after the training mode is entered, the power control module controls the direct current constant voltage power supply to uniformly output a group of voltage values, each self-learning dimming module finds out the voltage value which is most stably output by the corresponding sub-circuit in 2 seconds through a big data learning mode, when the difference between the voltage value and the last stable voltage value reaches 3V, the self-learning Xi Diaoguang module adjusts the light and drives the constant current to enable the voltage to drop by 20% for output, and after the voltage of the sub-circuit is re-stabilized, the stabilized voltage value is recorded in a dimming sequence.
In the second step, the self-learning dimming module fits a voltage dimming curve according to the principle of a big data smoothing algorithm after training is finished, and a voltage dimming sequence with more gears is obtained.
Further, the big data smoothing algorithm principle is a least square method.
Further, the operation mode includes the steps of:
step one, a power supply control module adjusts a direct-current constant-voltage power supply to output stable specific voltage;
and step two, the self-learning dimming module monitors the voltage of the sub-circuit in real time, matches the voltage closest to the specific voltage output in the step one from the stored voltage dimming sequence, and controls the constant current drive to output corresponding current after the matching is successful.
The beneficial effects of the invention are as follows:
according to the invention, a group of optimal voltage dimming sequences are generated for each end LED light source through a big data algorithm, so that the problem that dimming cannot be carried out according to a unified voltage signal due to line voltage drop or dimming according to the unified voltage can be carried out only by a very wide voltage interval is solved. The system has low requirements on the adjustment response time of the direct-current constant-voltage power supply and the sampling frequency of the self-learning dimming module, and the accuracy of the system can be increased by increasing the time in the training mode.
The whole lighting system is divided into a training stage and an operation stage, wherein the training stage is responsible for generating a voltage dimming sequence for each LED light source, and the operation stage realizes dimming by fuzzy matching between the output voltage and the voltage dimming sequence; the engagement of the training mode is realized by two groups of specific voltage differences in the power-on event and the engagement time of the direct-current constant-voltage power supply, and the exit of the training mode is engaged by the appointed duration; the dimming sequence of each LED light source side is not a fixed value, is not a preset value, but is an indefinite value dynamically generated by big data (theoretically, each dimming sequence is different due to the influence of line voltage drop); the number (dimming granularity) of the voltage dimming sequences can be obtained through training or can be increased through a multi-point smoothing algorithm, and can be a discrete Hash table or a continuous smooth curve equation; the voltage output by the direct current constant voltage power supply is attenuated by the line and then used as the working voltage of constant current driving and the dimming signal of constant current driving.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
As shown in fig. 1, a dc power LED lighting system includes a dc constant voltage power supply, a power control module, a constant current drive, a self-learning dimming module, and an LED light source; the direct-current constant-voltage power supply is connected in series to a main circuit of the lighting system and used for providing direct-current output for the lighting system, and the LED light sources are connected in series to the main circuit through the branch circuits; the output end of the power supply control module outputs a control signal to control the switch of the direct-current constant-voltage power supply and regulate the voltage output by the direct-current constant-voltage power supply; the constant current drive is arranged on a branch circuit between each LED light source and the main circuit and is used for providing constant current output for the LED light sources; the input end of the self-learning Xi Diaoguang module monitors the voltage output by the direct-current constant-voltage power supply, and the output end of the self-learning Xi Diaoguang module outputs a dimming signal to dim the LED light source.
The using method of the LED lighting system comprises the following steps: the using method comprises a training mode and an operation mode, wherein the training mode is used for setting or resetting a voltage dimming list in each self-learning dimming module; the running mode is used for controlling the direct-current constant-voltage power supply to output different voltage regulating constant-current driving output values, so that the brightness of the lighting system is regulated.
The training mode comprises the following steps:
step one, a power control module generates a signal for entering a training mode by turning off and on a direct-current constant-voltage power supply and generating a voltage difference of 20V twice within 4 seconds; after the self-learning dimming module monitors the power-off event of the power control module, monitoring the voltage of the secondary circuit for 0.5 second/time, finding the difference value of the two voltages within 5 seconds through a clustering method, and entering a training mode by the lighting system after the difference value is larger than 30V;
step two, after a training mode is entered, the power supply control module controls the direct-current constant-voltage power supply to uniformly output a group of voltage values, each self-learning dimming module finds out the voltage value which is most stably output by a corresponding sub-circuit in 2 seconds through a big data learning mode, as shown in a table 1, when the difference value between the voltage value and the last stable voltage value reaches 3V, the self-learning Xi Diaoguang module adjusts the light and drives the constant current to enable the output to be reduced by 20%, and after the voltage of the sub-circuit is stabilized again, the stabilized voltage value is recorded in a dimming sequence;
table 1 five speed dimming sequence
Obtaining a group of voltage dimming sequences after multiple training, comprehensively considering the influence of factors such as system voltage drop and the like, wherein the voltage and the dimming sequences stored after self-learning of each LED light source side of the final lighting system are different, and the voltage dimming sequences stored by the self-learning dimming module of the trained LED light source side are shown in a table 2, wherein V0> V1> V2> V3> V4;
TABLE 2 dimming sequence template
| Voltage sequence (V) | Dimming ratio |
| V0 | 100％ |
| V1 | 80％ |
| V2 | 60％ |
| V3 | 40％ |
| V4 | 20％ |
After training, the self-learning dimming module fits a voltage dimming curve according to a least square method to obtain a voltage dimming sequence (table 3) with more gears, and the original 5-gear dimming can be fitted into 10-gear dimming by reducing the difficulty of edge calculation in consideration of the management characteristics of the street lamp and the tunnel lighting system;
table 3 ten-gear dimming sequence
| Voltage sequence (V) | Dimming ratio |
| V0 | 100％ |
| V1 | 90％ |
| V2 | 80％ |
| V3 | 70％ |
| V4 | 60％ |
| V5 | 50％ |
| V6 | 40％ |
| V7 | 30％ |
| V8 | 20％ |
| V9 | 10％ |
And thirdly, automatically exiting the training mode by the lighting system after reaching the appointed time (30 s) after entering the training mode.
The operation mode includes the steps of:
step one, a power supply control module adjusts a direct-current constant-voltage power supply to output stable specific voltage;
and step two, the self-learning dimming module monitors the voltage of the sub-circuit in real time, matches the voltage closest to the specific voltage output in the step one from the stored voltage dimming sequence, and controls the constant current drive to output corresponding current after the matching is successful.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (9)
1. The direct-current power supply LED lighting system is characterized by comprising a direct-current constant-voltage power supply, a power supply control module, a constant-current driving and self-learning dimming module and an LED light source;
the direct-current constant-voltage power supply is connected in series to a main circuit of the lighting system and used for providing direct-current output for the lighting system, and the LED light sources are connected in series to the main circuit through the branch circuits;
the output end of the power supply control module outputs a control signal to control the switch of the direct-current constant-voltage power supply and regulate the voltage output by the direct-current constant-voltage power supply; the constant current drive is arranged on a branch circuit between each LED light source and the main circuit and is used for providing constant current output for the LED light sources; the input end of the self-learning Xi Diaoguang module monitors the voltage output by the direct-current constant-voltage power supply, and the output end of the self-learning Xi Diaoguang module outputs a dimming signal to dim the LED light source.
2. A method of using a dc powered LED lighting system as claimed in claim 1, characterized in that the method of use comprises a training mode and an operating mode, the training mode being used to set or reset a voltage dimming list inside each self-learning dimming module; the running mode is used for controlling the direct-current constant-voltage power supply to output different voltage regulating constant-current driving output values, so that the brightness of the lighting system is regulated.
3. A method of using a dc powered LED lighting system as defined in claim 2, wherein the training mode comprises the steps of:
step one, a power control module generates a signal for entering a training mode by turning off and on a direct-current constant-voltage power supply and generating a twice appointed voltage difference in an appointed time; after the self-learning dimming module monitors the power-off event of the power control module, the sub-circuit voltage is monitored, the difference value of the two voltages in the appointed time is found through a big data learning mode, and when the difference value is larger than a default value, the lighting system enters a training mode;
step two, after a training mode is entered, the power supply control module controls the direct-current constant-voltage power supply to uniformly output a group of voltage values, each self-learning dimming module finds out the voltage value which corresponds to the most stable output of the sub-circuit in a stipulated time in a big data learning mode, when the difference value between the voltage value and the last stable voltage value reaches the stipulated value, the self-learning Xi Diaoguang module dims the constant-current drive to enable the output to drop by a certain proportion, and after the voltage of the sub-circuit is re-stabilized, the stabilized voltage value is recorded in a voltage dimming sequence; a group of voltage dimming sequences are obtained after multiple training;
and thirdly, automatically exiting the training mode after entering the training mode for a preset time by the lighting system.
4. A method of using a DC powered LED lighting system as set forth in claim 3, wherein,
in the first step, the power control module generates a signal for entering the training mode by turning off and turning on the direct current constant voltage power supply and generating a voltage difference of 20V twice within 4 seconds.
5. A method of using a DC powered LED lighting system as set forth in claim 3, wherein,
in the first step, after the self-learning Xi Diaoguang module monitors the power-off event of the power control module, the sub-circuit voltage is monitored for 0.5 seconds/time, the difference value of the two voltages within 5 seconds is found through a clustering method, and when the difference value is greater than 30V, the lighting system enters a training mode.
6. A method of using a DC powered LED lighting system as set forth in claim 3, wherein,
and step two, after a training mode is entered, the power supply control module controls the direct-current constant-voltage power supply to uniformly output a group of voltage values, each self-learning dimming module finds out the voltage value which corresponds to the most stable output of the sub-circuit in 2 seconds through a big data learning mode, and when the difference between the voltage value and the last stable voltage value reaches 3V, the self-learning Xi Diaoguang module dims the constant-current drive to enable the output to be reduced by 20%, and after the voltage of the sub-circuit is re-stabilized, the stabilized voltage value is recorded in a dimming sequence.
7. A method of using a DC powered LED lighting system as set forth in claim 3, wherein,
and step two, fitting a voltage dimming curve by the self-learning dimming module according to a big data smoothing algorithm principle after training is finished, and obtaining voltage dimming sequences with more gears.
8. The method of claim 7, wherein the big data smoothing algorithm is a least squares method.
9. A method of using a dc powered LED lighting system as claimed in claim 2, wherein the operating mode comprises the steps of:
step one, a power supply control module adjusts a direct-current constant-voltage power supply to output stable specific voltage;
and step two, the self-learning dimming module monitors the voltage of the sub-circuit in real time, matches the voltage closest to the specific voltage output in the step one from the stored voltage dimming sequence, and controls the constant current drive to output corresponding current after the matching is successful.
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