阅读说明：本技术 误差最小化的led阵列系统 (Error-minimized LED array system ) 是由 陈怡� 郑利君 杜树旺 谢路耀 周丹 于 2020-04-03 设计创作，主要内容包括：一种误差最小化的LED阵列系统,包括LED阵列驱动电路、开关阵列、LED阵列和控制器,所述控制器包括标准库存储器、误差矢量幅度计算器、最小值存储器、译码器和缓冲器。在保持现有驱动电流固定的LED阵列系统简单性优点的基础上,通过接入和接出LED颗粒来完成LED阵列的合理布局,以误差最小为判断依据实现LED阵列的最优布局。为适应用户多样化的颜色和照度需求,本发明可灵活采用不同的误差计算公式。(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.)

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 storesGroup 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 memoryGroup data is stored in order, according toIs stored in ascending or descending order.

4. The error-minimizing LED array system of claim 1, wherein: the error is calculated by the formulaThe 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 memoryThe group data is in orderStored, pushedIs 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 enableAndwhen 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.

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 mostAnd (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 storesThe 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 compriseThe 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 isThis scheme can achieve minimization of color and illumination weighting errors.

With respect to the second preferred embodiment of the controller, the error calculation formula isThe 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 memoryGroup data is stored in order and can be pressedOrIs 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 orderAndwhen 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.