CN111565491A - Error-minimized LED array system - Google Patents
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Abstract
An error-minimized LED array system includes an LED array driving circuit, a switch array, an LED array, and a controller including a criteria bank memory, an error vector magnitude calculator, a minimum value memory, a decoder, and a buffer. On the basis of keeping the advantages of simplicity and simplicity of an existing LED array system with fixed driving current, reasonable layout of the LED array is completed by connecting in and out LED particles, and optimal layout of the LED array is achieved by taking minimum error as a judgment basis. In order to adapt to diversified color and illumination requirements of users, the invention can flexibly adopt different error calculation formulas.
Description
Technical Field
The invention relates to an LED array system, in particular to an LED array system with adjustable color and illumination.
Background
When the LED array system is used for mixed light illumination, its applications can cover home environments, industrial plants, commercial stores, cultivation, and landscape architecture.
Typically, the LED array for mixed-light illumination consists of strings of colorful LEDsAnd (4) granule composition. When the driving current of the LED array is fixed, the color and the illumination intensity can be adjusted by adjusting the layout of the LED particles connected into the LED array. However, such adjustable color and illumination have discrete characteristics. Assuming that a certain LED array with fixed driving current consists of m LED strings, and each LED string consists of n LED particles connected in series, the LED array can accurately provide color and illumination variation possibilities only at most
And (4) seed preparation. The user's demand for color and illumination variations often exceeds the precise variation range provided by the LED array. In short, there must be an error between discrete color and luminance characteristics and relatively continuous color and luminance requirements. In order to match the user's needs as closely as possible, it is desirable that the LED array system achieve error minimization.
Disclosure of Invention
In order to overcome the defect that the conventional LED array system with fixed driving current has discrete color and illumination characteristics and match the discrete color and illumination characteristics with relatively continuous color and illumination requirements as much as possible, the invention provides the LED array system with minimized errors.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an error-minimized LED array system includes an LED array driver circuit, a switch array, an LED array, and a controller,
the LED array driver circuit comprises controlled current sources i1 to im, m being a positive integer,
the switch array comprises switches Sj _1 to Sj _ nj, wherein nj is a positive integer, j has a value range of 1 to m,
the LED array comprises m LED strings, the jth LED string comprises nj LED particles connected in series, namely LED particles LEDj _1 to LEDj _ nj,
the switch array is positioned between the LED array driving circuit and the LED array, the switch states of the switches Sj _1 to Sj _ Nj determine the state of the j-th LED string connected into the LED array, the state of the j-th LED string connected into the LED array comprises Nj +1 states, namely Nj LED particles are connected, the value range of Nj is 0 to Nj, the LED particles which are not connected into the LED array are shielded by the switch array, the controlled current source ij provides driving current for the j-th LED string connected into the LED array,
the controller comprises a standard bank memory, an error vector magnitude calculator, a minimum value memory, a decoder and a buffer,
the controller is provided with 4 input ports, and respectively receives red requirement information R, green requirement information G, blue requirement information B and illumination requirement information Lux, wherein the value range of R is 0 to 255, the value range of G is 0 to 255, the value range of B is 0 to 255, the value range of Lux is 0 to MAXLUx, and MAXLUx is the maximum illumination provided by the LED array system,
the controller has m groups of output ports, the j group of output ports respectively correspond to the switch control signals Cj _1 to Cj _ nj, the values of Cj _1 to Cj _ nj determine the switch states of the switches Sj _1 to Sj _ nj,
the standard bank memory stores
The data of each group comprises the number Nj of LED particles of the jth LED string accessed into the LED array, and a red output value Rs, a green output value Gs, a blue output value Bs and an illumination output value Luxs of the LED array system corresponding to the Nj, wherein the data of each group comprise
The data set was obtained from the experiments and,
the error vector magnitude calculator extracts the data Rs, Gs, Bs and Luxs in the standard bank memory according to an error calculation formula, calculates an error E between the error E and the demand information R, G, B and Lux,
the minimum memory stores the minimum value Emin of the error E and the number Nj of LED particles of which the jth LED corresponding to the Emin is connected in the LED array in series to be Nj _ min,
the decoder converts Nj _ min corresponding to Emin into minimum error control signals Bj _1_ min to Bj _ Nj _ min,
the buffer converts the minimum error control signals Bj _1_ min to Bj _ nj _ min into the switch control signals Cj _1 to Cj _ nj.
Further, with respect to the first preferred embodiment of the controller, the error calculation formula is
This scheme can achieve minimization of color and illumination weighting errors.
With respect to the second preferred embodiment of the controller, the error calculation formula is
The controller further comprises a controllable current source control unit and a port Cij, wherein the controllable current source control unit adjusts the current value or the duty ratio of the controllable current source ij through the port Cij, and when Lux/Luxs _ min>When 1, the controllable current source control unit adjusts the controllable current source ij to increase the current value or the duty ratio; when Lux/Luxs _ min<When 1, the controllable current source control unit adjusts the controllable current source ij to make the current value or duty ratio thereof smaller. This scheme can achieve minimization of color error while achieving continuous variation of illumination by adjusting ij.
Further, in the standard bank memory
Group data is stored in order and can be pressed
Or
Is stored in ascending or descending order. The scheme can improve the speed of acquiring Emin.
Still further, the buffer performs signal conversion step by step in time sequence to order
And
when VCj is>When VBj _ min, the value of Cj _1 to Cj _ nj is changed once per timing sequence, and VCj is decreased until VCj becomes VBj _ min; when VCj is<VBj _ min, VCj is incremented by the value Cj _1 to Cj _ nj once per timing change until VCj becomes VBj _ min. The scheme can ensure that the actual composition of the LED array is gently changed, and can improve the comfort of a user.
Further, with respect to a preferred embodiment of the switch array, an anode of LEDj _1 is connected to a positive terminal of the controlled current source ij, a cathode of LEDj _ nj is connected to a negative terminal of the controlled current source ij, a first port of the switch Sj _ k is connected to an anode of LEDj _ k, a second port of the switch Sj _ k is connected to a cathode of LEDj _ nj, and a control port of the switch Sj _ k receives switch control signals Cj _ k, k having values ranging from 1 to nj.
In addition, the controllable current source ij may preferably adopt a power electronic converter with continuous output current, such as a Buck converter and a Superbuck converter.
The controller is realized by adopting an FPGA or a DSP.
The technical conception of the invention is as follows: aiming at the problem that the existing LED array system with fixed driving current has discrete characteristics of color and illumination, the method adopts an error minimization strategy to solve the contradiction between the characteristics and continuous requirements of color and illumination. Based on the error minimization strategy, different error calculation formulas can be adopted to meet the diversified demands of users.
The invention has the following beneficial effects: on the basis of keeping the advantage of simplicity of an existing LED array system with fixed driving current, reasonable layout of the LED array is completed by connecting in and out LED particles, and optimal layout of the LED array is realized by taking minimum error as a judgment basis; in order to adapt to diversified color and illumination requirements of users, different error calculation formulas can be flexibly adopted.
Drawings
Fig. 1 is a circuit block diagram of embodiment 1 of the present invention.
Fig. 2 is a circuit block diagram of embodiment 2 of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example 1
Referring to fig. 1, an error-minimized LED array system includes an LED array driving circuit, a switch array, an LED array, and a controller. The LED array driving circuit comprises controlled current sources i1 to im, m is a positive integer; the switch array comprises switches Sj _1 to Sj _ nj, wherein nj is a positive integer, the value range of j is 1 to m, a first port of the switch Sj _ k is connected with the anode of an LEDj _ k, a second port of the switch Sj _ k is connected with the cathode of an LEDj _ nj, and a control port of the switch Sj _ k receives switch control signals Cj _ k, and the value range of k is 1 to nj; the LED array comprises m LED strings, wherein the jth LED string comprises nj LED particles which are connected in series, namely the LED particles LEDj _1 to LEDj _ nj are connected in series, the anode of LEDj _1 is connected with the positive end of a controlled current source ij, and the cathode of LEDj _ nj is connected with the negative end of the controlled current source ij.
The switch array is positioned between the LED array driving circuit and the LED array, the switch states of the switches Sj _1 to Sj _ Nj determine the state of the j-th LED string connected into the LED array, the state of the j-th LED string connected into the LED array comprises Nj +1 states, namely Nj LED particles are connected, the value range of Nj is 0 to Nj, the LED particles which are not connected into the LED array are shielded by the switch array, and the controlled current source ij provides driving current for the j-th LED string connected into the LED array.
The controller includes a criteria bank memory, an error vector magnitude calculator, a minimum value memory, a decoder, and a buffer. The controller is provided with 4 input ports and is used for respectively receiving red requirement information R, green requirement information G, blue requirement information B and illumination requirement information Lux, the value range of R is 0-255, the value range of G is 0-255, the value range of B is 0-255, the value range of Lux is 0-MAXLUx, and MAXLUx is the maximum illumination provided by the LED array system. The controller is provided with m groups of output ports, the j group of output ports respectively correspond to the switch control signals Cj _1 to Cj _ nj, and the values of Cj _1 to Cj _ nj determine the switch states of the switches Sj _1 to Sj _ nj.
The standard bank memory stores
The data of each group comprises the number Nj of LED particles of the jth LED string accessed into the LED array, and a red output value Rs, a green output value Gs, a blue output value Bs and an illumination output value Luxs of the LED array system corresponding to the Nj, wherein the data of each group comprise
Group data is stored in order, according to
Is stored in ascending order of size, said
Data from the experiment were included.
The error vector magnitude calculator calculates the error according to an error calculation formula
Extracting data Rs, Gs, Bs and Luxs in a standard library memory, and calculating an error E between the data Rs, Gs, Bs and Luxs and the demand information R, G, B and the Lux; the minimum memory stores the minimum value Emin of the error E and the number Nj of LED particles of which the jth LED corresponding to the Emin is connected in the LED array in series, and the number Nj _ min is set; the decoder converts Nj _ min corresponding to Emin into minimum error control signals Bj _1_ min to Bj _ Nj _ min; the buffer converts the minimum error control signals Bj _1_ min to Bj _ nj _ min into the switch control signals Cj _1 to Cj _ nj to enable
And
when VCj is>When VBj _ min, the value of Cj _1 to Cj _ nj is changed once per timing sequence, and VCj is decreased until VCj becomes VBj _ min; when VCj is<VBj _ min, VCj is incremented by the value Cj _1 to Cj _ nj once per timing change until VCj becomes VBj _ min.
The controller may be implemented using an FPGA or a DSP (e.g., TMS320F 28335).
Embodiment 1 can minimize color and illumination weighting errors and quickly find the gradual change of Emin and the actual composition of the LED array.
Taking an LED array system with a scale of 3 × 6 as an example, the information of the LED array system is as follows, where m is 3, j has a value ranging from 1 to 3, n1 is n2 is n3 is 6, i1 is i2 is i3, the 1 st group of LED strings is composed of red LED particles connected in series, the 2 nd group of LED strings is composed of green LED particles, the 3 rd group of LED strings is composed of blue LED particles, the switches S1_1 to S1_6, S2_1 to S2_6 and S3_1 to S3_6 are all MOSFETs (e.g., IRF540), the standard bank memory stores experimental data of the 343 ascending group, and the error vector magnitude calculator extracts only the standard bank memory satisfying the requirement of the standard bank memory
(>0) The error E is calculated for the data of (1), the truth table of the decoder satisfies table 1:
TABLE 1
At a certain time, Cj _1 is equal to 0, Cj _2 is equal to 0, Cj _3 is equal to 1, Cj _4 is equal to 1, Cj _5 is equal to 1, Cj _6 is equal to 1 (corresponding to the jth LED string having 2 LED particles accessing the LED array), Bj _1_ min is equal to 0, Bj _2_ min is equal to 0, Bj _3_ min is equal to 0, Bj _4_ min is equal to 0, Bj _5_ min is equal to 1, and Bj _6_ min is equal to 1 (corresponding to the jth LED string requiring 4 LED particles accessing the LED array), and VCj > VBj _ min is satisfied. Thus, in the first subsequent sequence, the buffer output Cj _1 is 0, Cj _2 is 0, Cj _3 is 0, Cj _4 is 1, Cj _5 is 1, and Cj _6 is 1; in the second subsequent sequence, the buffer output Cj _1 is 0, Cj _2 is 0, Cj _3 is 0, Cj _4 is 0, Cj _5 is 1, Cj _6 is 1, and VCj is VBj _ min is realized.
Example 2
Referring to fig. 2, an error-minimized LED array system includes an LED array driving circuit, a switch array, an LED array, and a controller.
The controller comprises a standard bank memory, an error vector magnitude calculator, a minimum value memory, a decoder and a buffer, and further comprises a controllable current source control unit and a port Cij. The error calculation formula adopted by the controller is as follows
The minimum value memory not only stores Emin and the number Nj (let it be Nj _ min) of LED particles of which the jth LED corresponding to Emin is connected in series into the LED array, but also stores the illumination output value Luxs (let it be Luxs _ min) of the LED array system corresponding to Emin. The controllable current source control unit adjusts the current value or the duty ratio of the controllable current source ij through the port Cij, and when Lux/Luxs _ min>When 1, the controllable current source control unit adjusts the controllable current source ij to increase the current value or the duty ratio; when Lux/Luxs _ min<When 1, the controllable current source control unit adjusts the controllable current source ij to make the current value or duty ratio thereof smaller. In the standard bank memory
Group data is stored in order, according to
Is stored in descending order.
The rest of example 2 is the same as example 1, and the working mechanism of the same part is similar.
Embodiment 2 can achieve minimization of color error, fast determination of Emin, gradual changes in the actual composition of the LED array, and continuous changes in illumination.
Taking an LED array system with a scale of 3 × 6 as an example, the information of the LED array system is as follows, where m is 3, j has a value ranging from 1 to 3, n1 is n2 is n3 is 6, i1 is i2 is i3, the 1 st group of LED strings is composed of red LED particles connected in series, the 2 nd group of LED strings is composed of green LED particles, the 3 rd group of LED strings is composed of blue LED particles, switches S1_1 to S1_6, S2_1 to S2_6 and S3_1 to S3_6 all use BJTs (e.g., MPS2222A), and the standard bank memory stores the 343 groups of descending real-order real productsExamining the data, the error vector magnitude calculator extracting only the data satisfied in the standard bank memory
The error E is calculated for the data of (1), the truth table of the decoder satisfies table 2:
| Nj_min | Bj_1_min | Bj_2_min | Bj_3_min | Bj_4_min | Bj_5_min | Bj_6_min |
| 0 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 0 | 1 | 1 | 1 | 1 | 1 |
| 2 | 0 | 0 | 1 | 1 | 1 | 1 |
| 3 | 0 | 0 | 0 | 1 | 1 | 1 |
| 4 | 0 | 0 | 0 | 0 | 1 | 1 |
| 5 | 0 | 0 | 0 | 0 | 0 | 1 |
| 6 | 0 | 0 | 0 | 0 | 0 | 0 |
TABLE 2
At a certain time, Cj _1 is equal to 0, Cj _2 is equal to 0, Cj _3 is equal to 0, Cj _4 is equal to 0, Cj _5 is equal to 1, Cj _6 is equal to 1 (corresponding to the jth LED string having 4 LED particles accessing the LED array), Bj _1_ min is equal to 0, Bj _2_ min is equal to 0, Bj _3_ min is equal to 1, Bj _4_ min is equal to 1, Bj _5_ min is equal to 1, Bj _6_ min is equal to 1 (corresponding to the jth LED string having 2 LED particles accessing the LED array), and VCj < VBj _ min is satisfied. Thus, in the first subsequent sequence, the buffer output Cj _1 is 0, Cj _2 is 0, Cj _3 is 0, Cj _4 is 1, Cj _5 is 1, and Cj _6 is 1; in the second subsequent sequence, the buffer output Cj _1 is 0, Cj _2 is 0, Cj _3 is 1, Cj _4 is 1, Cj _5 is 1, Cj _6 is 1, and VCj is VBj _ min is realized.
Further assume that at a certain time, the current ij of the controllable current source is ij0 or the duty ratio D of ij is D0 and Lux/Luxs _ min ≠ 1. Then, at a subsequent time, the controllable current source control unit adjusts the controllable current source to satisfy ij-ij 0 × Lux/Luxs _ min or D-0 × Lux/Luxs _ min.
The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms set forth in the embodiments but rather by the equivalents thereof as may occur to those skilled in the art upon consideration of the present inventive concept.
Claims (9)
1. An error-minimizing LED array system, characterized by: the error-minimized LED array system includes an LED array drive circuit, a switch array, an LED array, and a controller,
the LED array driver circuit comprises controlled current sources i1 to im, m being a positive integer,
the switch array comprises switches Sj _1 to Sj _ nj, wherein nj is a positive integer, j has a value range of 1 to m,
the LED array comprises m LED strings, the jth LED string comprises nj LED particles connected in series, namely LED particles LEDj _1 to LEDj _ nj,
the switch array is positioned between the LED array driving circuit and the LED array, the switch states of the switches Sj _1 to Sj _ Nj determine the state of the j-th LED string connected into the LED array, the state of the j-th LED string connected into the LED array comprises Nj +1 states, namely Nj LED particles are connected, the value range of Nj is 0 to Nj, the LED particles which are not connected into the LED array are shielded by the switch array, the controlled current source ij provides driving current for the j-th LED string connected into the LED array,
the controller comprises a standard bank memory, an error vector magnitude calculator, a minimum value memory, a decoder and a buffer,
the controller is provided with 4 input ports for respectively receiving red requirement information R, green requirement information G, blue requirement information B and illumination requirement information Lux,
the controller has m groups of output ports, the j group of output ports respectively correspond to the switch control signals Cj _1 to Cj _ nj, the values of Cj _1 to Cj _ nj determine the switch states of the switches Sj _1 to Sj _ nj,
the standard bank memory stores
Group data, each group of data comprises the number Nj of LED particles of the jth LED string accessed into the LED array, and a red output value Rs, a green output value Gs, a blue output value Bs and an illumination output value Luxs of the LED array system corresponding to the Nj,
the error vector magnitude calculator extracts the data Rs, Gs, Bs and Luxs in the standard bank memory according to an error calculation formula, calculates an error E between the error E and the demand information R, G, B and Lux,
the minimum memory stores the minimum value Emin of the error E and the number Nj of LED particles of which the jth LED corresponding to the Emin is connected in the LED array in series to be Nj _ min,
the decoder converts Nj _ min corresponding to Emin into minimum error control signals Bj _1_ min to Bj _ Nj _ min,
the buffer converts the minimum error control signals Bj _1_ min to Bj _ nj _ min into the switch control signals Cj _1 to Cj _ nj.
2. The error-minimizing LED array system of claim 1, wherein: the error is calculated by the formula
3. The error-minimizing LED array system of claim 2, wherein: in the standard bank memory
Group data is stored in order, according to
Is stored in ascending or descending order.
4. The error-minimizing LED array system of claim 1, wherein: the error is calculated by the formula
The controller further comprises a controllable current source control unit and a port Cij, wherein the controllable current source control unit adjusts the current value or the duty ratio of the controllable current source ij through the port Cij, and when Lux/Luxs _ min>When 1, the controllable current source control unit adjusts the controllable current source ij to increase the current value or the duty ratio; when Lux/Luxs _ min<When 1, the controllable current source control unit adjusts the controllable current source ij to make the current value or duty ratio thereof smaller.
5. The error-minimizing LED array system of claim 4, wherein: in the standard bank memory
The group data is in orderStored, pushed
Is stored in ascending or descending order.
6. The error-minimizing LED array system of any of claims 1 to 5, wherein: the buffer performs signal conversion step by step according to time sequence to enable
And
when VCj is>When VBj _ min, the value of Cj _1 to Cj _ nj is changed once per timing sequence, and VCj is decreased until VCj becomes VBj _ min; when VCj is<VBj _ min, VCj is incremented by the value Cj _1 to Cj _ nj once per timing change until VCj becomes VBj _ min.
7. The error-minimizing LED array system of any of claims 1 to 5, wherein: the anode of the LEDj _1 is connected with the positive end of the controlled current source ij, the cathode of the LEDj _ nj is connected with the negative end of the controlled current source ij, the first port of the switch Sj _ k is connected with the anode of the LEDj _ k, the second port of the switch Sj _ k is connected with the cathode of the LEDj _ nj, and the control port of the switch Sj _ k receives the switch control signal Cj _ k, wherein the value range of k is 1-nj.
8. The error-minimizing LED array system of any of claims 1 to 5, wherein: the controllable current source ij adopts a power electronic converter with continuous output current.
9. The error-minimizing LED array system of any of claims 1 to 5, wherein: the controller is realized by adopting an FPGA or a DSP.
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