Lighting system

Abstract

To provide an illumination system capable of stabilizing light emission of illumination visually recognized by a user, where the present disclosure relates to the illumination system.SOLUTION: An illumination system according to the present disclosure includes a lighting device and a light source. The lighting device includes a lighting control circuit having a memory. The memory stores a correction value which is a value specific to each individual lighting device. The lighting control circuit determines a current value to be applied to the light source based on the correction value and an arbitrarily set command value, and controls such that current having the current value is applied to the light source.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to lighting systems. [Background technology]

[0002] Patent Document 1 discloses a lighting power supply device that can change control parameters through communication with an external device. This lighting power supply device calculates command values ​​based on the transmitted control parameters. Furthermore, this lighting power supply device controls the current, voltage, and power of an LED light source based on the command values.

[0003] The above-mentioned control parameters are transmitted from an external device to a microprocessor included in the lighting power supply device. The microprocessor can rewrite the control parameters by updating the memory. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-153527 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the above-mentioned lighting power supply device has a problem in that the amount of current flowing through the light source varies, which makes it easy for fluctuations to occur in the light emitted by the lighting that is visually recognized by the user.

[0006] In order to solve the above-mentioned problems, the present disclosure aims to provide a lighting system that can stabilize the light emission of the lighting visually recognized by the user. [Means for solving the problem]

[0007] A preferred aspect of the present disclosure is a lighting system comprising a lighting device and a light source, the lighting device comprising a lighting control circuit having a memory, the memory storing a correction value that is a value unique to each individual lighting device, and the lighting control circuit determining a current value to be passed through the light source based on the correction value and an arbitrarily set command value, and controlling the current to flow through the light source. [Effects of the Invention]

[0008] According to an aspect of the present disclosure, it is possible to provide a lighting system that can stabilize the light emission of lighting that is visually recognized by a user. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram illustrating a configuration of a lighting system according to a first embodiment of the present disclosure. [Figure 2] 1 is a diagram illustrating a configuration of a lighting device according to a first embodiment of the present disclosure. [Figure 3] 1 is a diagram illustrating a configuration of an auxiliary device according to a first embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0010] Embodiment 1 1 is a diagram illustrating a configuration of a lighting system according to a first embodiment of the present disclosure. Lighting system 500 is a system that can update a control program through communication from external device 400. The control program is a program that includes, for example, a formula for calculating a value of a current flowing through light source 10, which will be described later.

[0011] The lighting system 500 includes an auxiliary device 200. The communication device 230 included in the auxiliary device 200 receives a communication signal 700 including a control program from the external device 400. The communication device 230 also transmits the received communication signal 700 to the control circuit 220.

[0012] The control circuit 220 is configured, for example, by a microcomputer and has a built-in command transmission function. The control circuit 220 converts the control program acquired from the received communication signal into a command using the command transmission function. The control circuit 220 then transmits the control program to the lighting device 100 as a command.

[0013] The lighting control circuit 140 included in the lighting device 100 receives a communication signal 800 including a control program via the CN210 and the CN160. The lighting control circuit 140 is configured, for example, by a microcomputer, and is a circuit that controls the lighting circuit 120 using the control program. More specifically, the lighting control circuit 140 determines the value of a current to be passed through the light source 10, which will be described later, and controls the light source 10 so that a current of the determined value flows through the light source 10.

[0014] The lighting control circuit 140 also has a memory 150. The memory 150 is, for example, a nonvolatile memory, and stores a correction value n, which will be described later, and a control program used by the lighting control circuit 140.

[0015] The lighting circuit 120 turns on the light source 10 via the CN 130. The light source 10 functions as a light source for a lighting fixture (not shown). The lighting operation will be described in detail later. The lighting circuit 120 is also connected to a commercial power supply 600 via the CN 110. The lighting device 100 receives power from the commercial power supply 600 via the lighting circuit 120.

[0016] 2 is a diagram illustrating the configuration of a lighting device according to the first embodiment of the present disclosure. Lighting device 100 receives power from commercial power supply 600 via CN 110. The supplied current is rectified by rectifier 1. The rectified pulsating voltage is converted into a predetermined high DC voltage by boost chopper circuit 20 and stored in capacitor 2. Boost chopper circuit 20 is composed of coil 21, MOSFET 22, and diode 23.

[0017] The voltage of the electricity stored in capacitor 2 is input to terminal 141 of lighting control circuit 140 as a voltage divided by resistors 3 and 4. Therefore, the voltage input to terminal 141 is maintained constant by maintaining the voltage of the electricity stored in capacitor 2 at a predetermined DC high voltage.

[0018] Therefore, the lighting control circuit 140 outputs a switching signal from terminal 142 that operates the MOSFET 22, thereby performing feedback control to keep the voltage input to terminal 141 constant. However, the operating voltage of the lighting control circuit 140 does not reach the drive voltage of the MOSFET 22. Therefore, the lighting control circuit 140 outputs a switching signal via the MOSFET driver 30. This output causes the voltage of the switching signal to reach the drive voltage, stabilizing the switching of the MOSFET 22.

[0019] The electricity stored in the capacitor 2 is smoothed by the buck converter circuit 35 and stored in the capacitor 5. The buck converter circuit 35 is made up of a MOSFET 31, a coil 32, and a diode 33.

[0020] The buck converter circuit 35 also supplies power to the light source 10. The light source 10 is made up of one or more LEDs. This power supply causes the light source 10 to light up.

[0021] Furthermore, the current supplied to the light source 10 is converted into a voltage by the resistor 6 and input to a terminal 143 of the lighting control circuit 140. The voltage input to this terminal 143 is feedback controlled so as to be constant. The lighting control circuit 140 uses this voltage to output a switching signal from a terminal 144 that operates the MOSFET 31. As a result, the current supplied to the light source 10 becomes constant, and the light source 10 is subjected to constant current control.

[0022] The switching signal that operates the MOSFET 31 is output via the MOSFET driver 30, similar to the switching signal that operates the MOSFET 22. This output ensures that the voltage of the switching signal reaches the drive voltage, and the switching of the MOSFET 31 becomes stable.

[0023] The control power for the lighting control circuit 140 and the MOSFET driver 30 is supplied from a voltage source 8. The voltage V1 of the voltage source 8 is generated by passing the charge stored in the capacitor 2 through the control power supply circuit 40, and is then smoothed by the capacitor 7. The voltage V1 is, for example, 15 V.

[0024] The voltage V1 is further input to a terminal 145 of the lighting control circuit 140 via a step-down circuit 45, and serves as a control power supply for the lighting control circuit 140. The voltage at this time is, for example, 5V.

[0025] The control power supply circuit 40 may be a step-down converter circuit such as a buck converter circuit, or a step-up / step-down converter circuit such as a flyback circuit.

[0026] The lighting control circuit 140 has a control program as described above. The control program is a program used to control the lighting of the light source 10 by controlling the lighting device 100. The control program may include, for example, values ​​or formulas required to control the supply of power to the light source 10 or the time from when the commercial power source 600 is supplied until the light source 10 is turned on. An example of a formula required for power supply is a formula for calculating the value of the current to be passed through the light source 10. Alternatively, the control program may include values ​​required to control the brightness of the light source 10 by processing a dimming signal received from an external dimming controller (not shown).

[0027] Here, a description will be given of the constant current control of the light source 10 by the control program included in the lighting control circuit 140. First, a calculation formula used in conventional constant current control will be described.

[0028] The current detection voltage Vp2 generated at the terminal 143 of the lighting control circuit 140 is a voltage generated across the resistor 6. Therefore, when the value of the current flowing through the light source 10 is ILED and the resistance of the resistor 6 is R4, the current detection voltage Vp2 is expressed by Equation 1.

[0029]

number

[0030] The reference voltage Vref used by the lighting control circuit 140 to keep the voltage at the terminal 143 constant is generated based on the voltage at the terminal 145. The reference voltage Vref is expressed by Equation 2 using the voltage VDD of the control power supply.

[0031]

number

[0032] Here, it is assumed that the AD conversion is performed as a 10-bit digital conversion. The internal command value is N, which can be set arbitrarily from integers between 0 and 1023. The larger the value of N, the easier it is to achieve control that suppresses the variations described below. Furthermore, the digital value obtained by AD converting the voltage detected at terminal 143 is actually compared with the reference voltage.

[0033] The feedback control is performed so that Equation 1 is equal to Equation 2. Therefore, the conventional current value ILED′ flowing through the light source 10 is expressed by Equation 3.

[0034]

number

[0035] As described above, the conventional current value ILED' can be set by multiplying the value specified by the detected value by the command value N. Even when processing a dimming signal received from an external dimming controller, the brightness of the light source 10 can be controlled by arbitrarily setting the command value N based on the dimming signal.

[0036] Here, factors that affect the current value ILED' include errors that occur in the resistor R4 and the voltage VDD. These errors occur as manufacturing variations, which cause variations in the current value ILED, and therefore variations in the brightness of the light source 10. As a result, there is a problem of fluctuations in the light emission of the illumination.

[0037] Therefore, in order to absorb the above-mentioned error, the current value ILED in this embodiment is calculated by adding or subtracting a correction value n to or from the command value N. The correction value n is a value unique to each individual lighting device 100, and is a value stored in the memory 150 separately from the control program. As a result, the current value ILED is expressed by Equation 4.

[0038]

number

[0039] As described above, the current value ILED can be set by multiplying a value determined by the detection value by a value obtained by adding or subtracting the correction value n from the command value N. According to this embodiment, the correction value n is set at the time of manufacture to suppress manufacturing variations, thereby suppressing variations in the current flowing through the light source 10. As a result, the light emission of the illumination visually recognized by the user can be stabilized.

[0040] Note that the value defined by the detection value is a value defined by the resistance R4 and the voltage VDD in Equation 4, but is not limited to this. For example, the value defined by the detection value may be a value defined by a detection value that can be detected by the lighting device 100.

[0041] Furthermore, since the correction value n will be a different value for each individual lighting device 100, it is preferable to set the correction value n when a power-on test is performed on the lighting device 100 during manufacturing and store the value in the memory 150. For example, the correction value n may be set to be larger than the variation in the measurement results of the current value ILED obtained by Equation 3 multiple times.

[0042] Next, we will explain how to update the control program stored in the lighting control circuit 140. Updating the control program means, for example, updating the command value N in Equation 4 to change the brightness of the light source 10. Alternatively, updating the control program may mean, for example, updating the time schedule for turning on or off the light source 10, or correcting the control program itself in which a bug has been discovered.

[0043] The lighting control circuit 140 has a terminal 146 which is a data input terminal. The terminal 146 is connected to the CN 160 together with the voltage source 8 and a ground terminal 147. The lighting control circuit 140 can update the control program by inputting a command from the terminal 146.

[0044] 3 is a diagram showing the configuration of the auxiliary device according to the first embodiment of the present disclosure. The auxiliary device 200 has a CN210 connected to the CN160 of the lighting control circuit 140.

[0045] Terminal 146 shown in FIG. 2 is connected to terminal 221 of control circuit 220 via CN210. Furthermore, voltage source 8 shown in FIG. 2 is connected to terminal 222 of control circuit 220 via CN210 and step-down circuit 240. The voltage at this time is, for example, 5 V. As a result, voltage V1 serves as the drive power source for control circuit 220. Furthermore, ground terminal 147 shown in FIG. 2 is connected to ground terminal 223 of control circuit 220 via CN210.

[0046] Furthermore, the terminal 224 of the control circuit 220 is connected to the communication device 230. The control circuit 220 receives a communication signal 700 including a control program via the communication device 230. As a result, the control circuit 220 obtains the control program from the external device 400. In this case, this control program is an update control program used to update the control program of the lighting control circuit 140.

[0047] The communication signal 700 may be transmitted by wireless communication such as Bluetooth, or may be transmitted by wired communication such as URAT communication.

[0048] The control circuit 220 transmits the acquired control program as a command. This command transmission is performed via terminals 221 and 146. The lighting control circuit 140 updates the control program by rewriting the control program stored in the memory 150 with the control program transmitted as a command.

[0049] At this time, the lighting control circuit 140 may control the lighting of the light source 10, or may turn off the light source 10. However, if the control program to be updated is related to brightness control, the light source 10 must be turned off.

[0050] In a conventional control program update, all values ​​related to the lighting control of the light source 10 are updated. As mentioned above, for example, the current value ILED' varies due to manufacturing variations. This variation in the current value ILED' occurs again every time the control program is updated. As a result, there is a problem in that the light emission of the light source fluctuates every time the control program is updated.

[0051] In the update of the control program according to this embodiment, only the values ​​included in the control program are updated. For example, if the brightness of the light source 10 is changed by this update, the command value N is updated.

[0052] On the other hand, this update does not update the correction value n stored in memory 150 separately from the control program. As described above, the correction value n is a value set to suppress manufacturing variations. Therefore, by not updating the correction value n when updating the control program, it is possible to suppress manufacturing variations that arise anew when the control program is updated.

[0053] In addition, not updating the correction value n may be achieved by not rewriting the part where the correction value n is stored when rewriting the control program stored in memory 150, or by rewriting it to the same correction value n.

[0054] As described above, according to this aspect of the present embodiment, it is possible to suppress variations in the current flowing through the light source 10 even after updating the control program. As a result, it is possible to stabilize the light emission visually recognized by the user. Furthermore, according to this aspect of the present embodiment, the auxiliary device 200 obtains drive power from the lighting device 100 only when updating the control program, thereby realizing power saving.

[0055] In addition, auxiliary device 200 can be operated without securing a separate power supply source by obtaining drive power from lighting device 100. Furthermore, auxiliary device 200 only needs to obtain drive power from lighting device 100 when updating the control program, thereby achieving power saving.

[0056] Below, the aspects of the present disclosure will be summarized as appendices.

[0057] (Appendix 1) Equipped with a lighting device and a light source, the lighting device includes a lighting control circuit having a memory; the memory stores a correction value that is a value unique to each individual lighting device; The lighting control circuit determining a current value to be applied to the light source based on the correction value and an arbitrarily set command value; Controlling the current to flow to the light source Lighting system. (Appendix 2) the memory further stores a control program including a formula for calculating the current value; the calculation formula is a formula for multiplying a value specified by a detected value by a value obtained by adding or subtracting the correction value from the command value, The lighting control circuit calculates the current value using the control program. 10. The lighting system of claim 1. (Appendix 3) Further equipped with auxiliary equipment, The auxiliary equipment is receiving a communication signal including an update control program from an external device; transmitting the update control program to the lighting device as a command; The lighting control circuit rewrites the control program stored in the memory with the updated control program without changing the correction value. 10. A lighting system as described in Appendix 2. (Appendix 4) When the lighting control circuit rewrites the control program stored in the memory, it rewrites the correction value to the same correction value. 4. The lighting system of claim 2 or 3. (Appendix 5) The auxiliary device obtains driving power from the lighting device 5. The lighting system of claim 2. [Explanation of symbols]

[0058] 10 light source 100 Lighting Device 140 Lighting control circuit 150 memory 200 Auxiliary equipment 400 External device 500 Lighting System 700 Communication Signals 800 communication signal

Claims

1. Equipped with a lighting device and a light source, the lighting device includes a lighting control circuit having a memory; the memory stores a correction value that is a value unique to each individual lighting device; The lighting control circuit determining a current value to be applied to the light source based on the correction value and an arbitrarily set command value; Controlling the current to flow to the light source Lighting system.

2. the memory further stores a control program including a formula for calculating the current value; the calculation formula is a formula for multiplying a value specified by a detected value by a value obtained by adding or subtracting the correction value from the command value, The lighting control circuit calculates the current value using the control program.

10. The lighting system of claim 1.

3. Further equipped with auxiliary equipment, The auxiliary equipment is receiving a communication signal including an update control program from an external device; transmitting the update control program to the lighting device as a command; The lighting control circuit rewrites the control program stored in the memory with the updated control program without changing the correction value.

3. The lighting system of claim 2.

4. When the lighting control circuit rewrites the control program stored in the memory, it rewrites the correction value to the same correction value.

4. The lighting system of claim 3.

5. The auxiliary device obtains driving power from the lighting device 5. A lighting system according to claim 3 or 4.

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