Lighting device with current and brightness based monitoring system

Abstract

The utility model discloses a lighting device based on a current and brightness monitoring system, comprising a light source used for generating light rays and forming light beams; a driving circuit which lights the light source and supplies power to the light source; a current detection unit that detects a current of the drive circuit; a brightness detection unit that detects the brightness of the light beam; the control module is used for storing corresponding relations between a plurality of groups of current values of the light source and ideal brightness values, and is respectively in signal connection with the current detection unit and the brightness detection unit; wherein the control module respectively picks up a detection current value detected by the current detection unit and a detection brightness value detected by the brightness detection unit, and compares the detection current value and the detection brightness value with the corresponding correspondence so as to judge whether the light source has a fault or not. In this way, the light source can be monitored in real time, and abnormity can be recognized in time. The detection system is simple in structure, can be additionally configured, can be installed in the lighting device independent of other effect components, and is high in adaptability and convenient to maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of lighting devices, and more particularly to a lighting device with a current and brightness monitoring system. Background Art

[0002] In recent years, lighting technology has advanced rapidly, with high-power LEDs and lasers gradually replacing traditional halogen bulbs as the light source for lighting devices. Both types of light sources offer the advantage of high brightness, with lasers in particular producing a beam with a very narrow divergence angle. When used in lighting devices, the overall optical path can be greatly compressed, resulting in lighter, smaller lamps and more precise user control.

[0003] However, laser light sources with high energy density or high-power LED light sources with ultra-high brightness also pose potential safety risks and may cause damage to the user's eyes, skin, or some sensors that are very sensitive to light. Existing research attempts to address these safety issues by adding protective devices. For example, protective screens and diffusers reduce the risk of direct exposure, and light shields and precise projection technology limit light scattering. However, these methods often have problems such as delayed response time and poor protection effect in practical applications. Therefore, when using lighting devices with this type of light source, it is also necessary to add reliable protective devices to monitor whether there are any abnormalities in real time, and to reduce risks in a timely manner when the lighting device fails. Utility Model Content

[0004] In order to overcome at least one of the defects described in the above-mentioned prior art, the present utility model provides a lighting device based on a current and brightness monitoring system, which detects in real time whether the correspondence between the current value of the light source and the brightness value of the light beam reaches the ideal value, thereby judging the occurrence of a fault and shutting down the lighting device in time.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a lighting device based on a current and brightness monitoring system, including a light source for generating light and forming a light beam; a driving circuit for lighting the light source and powering it; a current detection unit for detecting the current of the driving circuit; a brightness detection unit for detecting the brightness of the light beam; and a control module for storing a correspondence between several groups of current values ​​and ideal brightness values ​​of the light source, which is respectively connected to the current detection unit and the brightness detection unit signals; wherein the control module respectively picks up the detection current value detected by the current detection unit and the detection brightness value detected by the brightness detection unit, and compares them with the corresponding correspondences to determine whether the light source has a fault.

[0006] The current detection unit is used to detect the current of the driving circuit, and its current value is read and transmitted to the control module. The brightness detection unit reads the brightness value of the light beam, such as illuminance, color temperature and other parameters, and transmits the detected brightness value to the control module. Then, the control module compares the received detection current value and detection brightness value with the current value and ideal brightness value stored in its own internal storage, so as to determine whether the light source has a fault. In this way, the light source can be monitored in real time and abnormalities can be identified in time. The detection system has a simple structure, can be additionally configured, and can be installed inside the lighting device independently of other effect components. It has high adaptability and is easy to maintain.

[0007] Specifically, when the driving circuit receives an instruction to input an initial current value, the current detection unit detects the current value flowing through the driving circuit to obtain the detected current value, and the brightness detection unit detects the brightness parameters of the light beam at this time to obtain the detected brightness value, and transmits the data to the control module simultaneously or successively. The control module, which has stored several sets of corresponding relationships between current values ​​and ideal brightness values, judges whether the detected current value and the detected brightness value meet the standards based on the initial current value. Only when both values ​​meet the standards can it be judged as a normal working state, otherwise it is judged as a fault.

[0008] Furthermore, the light source comprises multiple light-emitting units, each driven by a set of drive circuits, and each drive circuit uses a current detection unit to detect current. Each set of drive circuits illuminates and supplies power to a light-emitting unit; the current detection unit corresponds one-to-one with each drive circuit, detecting the current value of each drive circuit. This split-path drive approach allows for real-time monitoring of higher-power light sources.

[0009] Furthermore, the device further includes a protection circuit connected to the control module. When the protection circuit receives a fault signal from the control module, it disconnects the drive circuit. This effectively avoids hidden dangers caused by abnormalities of the lighting device, such as preventing injuries to viewers due to sudden excessive brightness.

[0010] Furthermore, the system further includes a focusing lens for adjusting the focal length of the light beam, and the brightness detection unit is positioned near the edge of the focusing lens. Since light is more concentrated near the focusing lens, positioning the brightness detection unit near the focusing lens allows for more accurate reading of the light beam parameters, resulting in an accurate detected brightness value, further improving the reliability of the monitoring system.

[0011] Furthermore, the driving circuit includes a substrate, the light source is mounted on the substrate, and the current detection unit is disposed on the substrate. The current detection unit can be disposed closer to the driving circuit, thereby reducing the length of wiring and making the wiring inside the lighting device more concise.

[0012] Furthermore, the control module includes a first MCU and a second MCU that are signal-connected to each other, the current detection unit signal is connected to the first MCU to transmit the detected current value to the first MCU, and the brightness detection unit signal is connected to the second MCU to transmit the detected brightness value to the second MCU, and the corresponding corresponding relationship is compared using the first MCU or the second MCU. The first MCU and the second MCU are connected via an input signal line, an output signal line, a power line, and a ground line. Compared with the wiring method in which the current detection unit and the brightness detection unit are connected to the same MCU, this wiring method is simpler, reduces the restrictions on the installation positions of the current detection unit and the brightness detection unit, and can be installed in a suitable position inside the lighting device according to design requirements.

[0013] Furthermore, the current detection unit includes a current detection chip, which has two detection current input terminals connected to the drive circuit, two detection current output terminals, one input voltage terminal and an AD signal output terminal. The current of the drive circuit enters the current detection chip through the detection current input terminal and flows out from the detection current output terminal. The current detection chip picks up the input current value and converts it into an AD signal representing the detection current value, which is finally output through the AD signal output terminal and transmitted to the control module.

[0014] Furthermore, the current detection unit also includes a step-down unit and a filter unit connected between the current detection chip and the control module. The AD signal output from the AD signal output terminal is sequentially transmitted to the step-down unit and the filter unit, and ultimately transmitted to the control module. The step-down unit and the filter unit are used to divide and filter the signal output from the AD signal output terminal to obtain a lower voltage and more accurate AD signal, which is ultimately transmitted to the control module, effectively protecting the control module from burnout due to excessive voltage.

[0015] Furthermore, the brightness detection unit includes a light intensity detection chip for detecting the brightness value of the light beam. The light intensity detection chip has two I2C output ports. After the light intensity detection chip detects the brightness value of the light beam and converts it into a signal representing the detected brightness value, it outputs the signal to the control module via the two I2C output ports. The use of the highly compatible I2C output ports effectively simplifies circuit design.

[0016] Furthermore, the device further includes a lamp head for mounting the light source and an arm for pivotally connecting the lamp head. The lamp head internally houses an effect module for intercepting the light beam and generating a corresponding light effect, a first detection unit for detecting the motion position of the effect module, and a second detection unit for detecting the rotational position of the lamp head or arm. The first and second detection units are signal-connected to the control module. Because laser light sources or high-power LED light sources have high brightness and high energy density, which can easily cause damage to viewers or camera equipment, the addition of the first and second detection units increases the sensitivity of the detection system, enabling more accurate detection of the operation of the lighting device.

[0017] Furthermore, the light source is an LED light source or a laser light source. The type of the light source can be selected according to the actual use scenario and needs. Both light sources have obvious advantages in terms of high energy efficiency, long life and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a circuit schematic diagram of the current detection unit, brightness detection unit and control module of the utility model.

[0019] Figure 2 It is a circuit schematic diagram of the current detection chip part in the current detection unit.

[0020] Figure 3 It is a schematic diagram of the installation structure of the light source, the driving circuit and the current detection unit.

[0021] Figure 4 It is a structural diagram of a lighting device equipped with a current and brightness detection system.

[0022] In the picture:

[0023] 110. Driving circuit; 111. Substrate; 120. Current detection unit; 121. Current detection chip; 122. Detection current input terminal; 123. Detection current output terminal; 124. Input voltage terminal; 125. AD signal output terminal; 126. Step-down unit; 127. Filter unit; 130. Brightness detection unit; 131. Light intensity detection chip; 132. I2C output port; 133. Enable pin; 134. Pull-up unit; 140. Control module; 141. First MCU; 142. Second MCU; 150. Protection circuit; 200. Lamp head; 210. Light source; 220. Focusing lens; 230. Effect module; 240. Radiator; 300. Arm; 400. Chassis. DETAILED DESCRIPTION

[0024] The drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate the embodiments, some components in the drawings may be omitted, enlarged, or reduced in size, and do not represent actual product dimensions. Those skilled in the art will understand that some well-known structures and their descriptions may be omitted from the drawings. The positional relationships depicted in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0025] like Figures 1 to 3 As shown, a lighting device based on a current and brightness monitoring system includes a light source 210 for generating light and forming a light beam; a driving circuit 110 for lighting the light source 210 and supplying power to it; a current detection unit 120 for detecting the current of the driving circuit 110; a brightness detection unit 130 for detecting the brightness of the light beam; and a control module 140 for storing a plurality of sets of corresponding relationships between current values ​​and ideal brightness values ​​of the light source 210, which are respectively connected to the current detection unit 120 and the brightness detection unit 130 by signal; wherein the control module 140 respectively picks up the detection current value detected by the current detection unit 120 and the detection brightness value detected by the brightness detection unit 130, and compares them with the corresponding relationships, thereby determining whether the light source 210 has a fault.

[0026] The current detection unit 120 is used to detect the current of the driving circuit 110, and its current value is read and transmitted to the control module 140, while the brightness detection unit 130 reads the brightness value of the light beam, such as illuminance, color temperature and other parameters, and transmits the detected brightness value to the control module 140. Then, the control module 140 compares the received detection current value and detection brightness value with the current value and ideal brightness value stored in itself, so as to determine whether the light source 210 has a fault. In this way, the light source 210 can be monitored in real time and abnormalities can be identified in time. The detection system has a simple structure, can be additionally configured, and can be installed inside the lighting device independently of other effect components. It has high adaptability and is easy to maintain.

[0027] Specifically, when the driving circuit 110 receives an instruction to input an initial current value, the current detection unit 120 detects the current value flowing through the driving circuit 110 to obtain the detected current value, and the brightness detection unit 130 detects the brightness parameters of the light beam at this time to obtain the detected brightness value, and transmits the data to the control module 140 at the same time or in sequence. The control module 140, which has stored several sets of corresponding relationships between current values ​​and ideal brightness values, judges whether the detected current value and the detected brightness value meet the standards based on the initial current value. Only when both values ​​meet the standards can it be judged as a normal working state, otherwise it is judged as a fault.

[0028] Optionally, the detection current value may be converted by detecting the voltage value of the driving circuit 110 .

[0029] In other embodiments of the present invention, several sets of ratios of current values ​​to ideal brightness values ​​may be stored in the control module 140 , and the ratios of the detected current values ​​to the detected brightness values ​​may be detected for comparison to identify abnormalities.

[0030] In a preferred embodiment of the present invention, the light source 210 comprises multiple light-emitting units, each of which is driven by a set of driver circuits 110. Each driver circuit 110 performs current detection via a current detection unit 120. Each set of driver circuits 110 illuminates and supplies power to a respective light-emitting unit. The current detection units 120 correspond one-to-one with each driver circuit 110, detecting the current values ​​of each driver circuit 110 and simultaneously reporting these values ​​to the control module 140. This split-path drive approach allows for real-time monitoring of the higher-power light sources 210.

[0031] In a preferred embodiment of the present invention, a protection circuit 150 is signal-connected to the control module 140. Upon receiving a fault signal from the control module 140, the protection circuit 150 disconnects the drive circuit 110. This effectively prevents potential hazards caused by abnormal lighting devices, such as sudden excessive brightness that could harm spectators. The protection circuit 150 includes a relay.

[0032] Preferably, the protection circuit 150 is located between the driving circuit 110 and the current detection unit 120 and is connected to both of them, and is signal-connected to the control module 140 .

[0033] Preferably, when the protection circuit 150 receives a fault signal, it turns off the light source 210 .

[0034] In other embodiments of the present invention, the protection circuit 150 can be used to shut down the entire lamp.

[0035] like Figure 1 and Figure 4 As shown, in a preferred embodiment of the present invention, a focusing lens 220 is further included for adjusting the focal length of the light beam, and the brightness detection unit 130 is disposed near the edge of the focusing lens 220. The light near the focusing lens 220 is more concentrated. By arranging the brightness detection unit 130 near the focusing lens 220, the parameters of the light beam can be read more accurately, and an accurate detected brightness value can be obtained, thereby further improving the reliability of the monitoring system.

[0036] Preferably, the focusing lens 220 can move back and forth along the emission direction of the light beam, thereby adjusting the focal length of the light beam.

[0037] Preferably, the brightness detection unit 130 may include at least two light intensity detection chips 131 whose signals are connected to the same control module 140 and are installed in different positions. When one of them is blocked by other components, the other one can pick up the light parameters of the light beam and output the detected brightness value in time, thereby improving reliability.

[0038] like Figure 1 and Figure 2 As shown, in a preferred embodiment of the present invention, the driving circuit 110 includes a substrate 111, the light source 210 is mounted on the substrate 111, and the current detection unit 120 is disposed on the substrate 111. The current detection unit 120 can be disposed closer to the driving circuit 110, which reduces the difficulty of wiring, makes the wiring inside the lighting device simpler, and prevents signal lines from being broken.

[0039] In a preferred embodiment of the present invention, the control module 140 includes a first MCU 141 and a second MCU 142 that are signal-connected to each other, the current detection unit 120 is signal-connected to the first MCU 141 to transmit the detected current value to the first MCU 141, and the brightness detection unit 130 is signal-connected to the second MCU 142 to transmit the detected brightness value to the second MCU 142, and the corresponding correspondence is compared using the first MCU 141 or the second MCU 142. The first MCU 141 and the second MCU 142 are connected by an input signal line, an output signal line, a power line, and a ground line. Compared with the wiring method in which the current detection unit 120 and the brightness detection unit 130 are connected to the same MCU, such wiring is simpler, reduces the restrictions on the installation positions of the current detection unit 120 and the brightness detection unit 130, and can be installed at a suitable position inside the lighting device according to design requirements.

[0040] Preferably, the first MCU 141 or the second MCU 142 can be selected as the final processing unit as needed, and the detected current value and the detected brightness value can be transmitted to the same MCU for comparison inside and a signal of whether a fault exists can be issued.

[0041] In a preferred embodiment of the present utility model, the current detection unit 120 includes a current detection chip 121, and the current detection chip 121 has two detection current input terminals 122 connected to the drive circuit 110, two detection current output terminals 120, one input voltage terminal 124 and an AD signal output terminal 125. The current of the drive circuit 110 enters the current detection chip 121 through the detection current input terminal 122 and flows out from the detection current output terminal 120. The current detection chip 121 picks up the input current value and converts it into an AD signal representing the detection current value, and finally outputs it through the AD signal output terminal 125 and transmits it to the control module 140.

[0042] In a preferred embodiment of the present invention, the current detection unit 120 further includes a step-down unit 126 and a filter unit 127 connected between the current detection chip 121 and the control module 140. The AD signal output from the AD signal output terminal 125 is sequentially transmitted to the step-down unit 126 and the filter unit 127, and finally transmitted to the control module 140. The step-down unit 126 and the filter unit 127 are used to divide and filter the signal output from the AD signal output terminal 125 to obtain a lower voltage and more accurate AD signal, which is finally transmitted to the control module 140, effectively protecting the control module 140 from burning out due to excessive voltage.

[0043] In other embodiments of the present invention, the control module 140 adopts a high-voltage MCU, and the step-down unit 126 and the filtering unit 127 can be eliminated.

[0044] In a preferred embodiment of the present invention, the brightness detection unit 130 includes a light intensity detection chip 131 for detecting the brightness value of the light beam. The light intensity detection chip 131 has two I2C output ports 132. After the light intensity detection chip 131 detects the brightness value of the light beam and converts it into a signal representing the detected brightness value, the signal is output to the control module 140 via the two I2C output ports 132. The use of the highly compatible I2C output ports 132 effectively simplifies circuit design.

[0045] Preferably, each of the I2C output ports 132 is provided with a pull-up unit 134 to ensure that the I2C communication line can be in a stable pull-up state, thereby keeping the entire communication line stable.

[0046] Preferably, an enable pin 133 is further included, and R3 is a pull-up unit 134 of the enable pin 133 . The enable pin 133 is pulled up and closed for a long time, and the control module 140 can pull it down and open it for use.

[0047] In a preferred embodiment of the present invention, a lamp head 200 for mounting the light source 210 and an arm 300 for pivotally connecting the lamp head 200 are further included. The lamp head 200 is internally mounted with an effect module 230 for intercepting the light beam and generating a corresponding light effect, a first detection unit for detecting the movement position of the effect module 230, and a second detection unit for detecting the rotational position of the lamp head 200 or the arm 300. The first and second detection units are signal-connected to the control module 140. Because laser light sources or high-power LED light sources 210 have high brightness and high energy density, they can easily cause damage to viewers or camera equipment. The addition of the first and second detection units increases the sensitivity of the detection system, enabling more accurate detection of the operation of the lighting device.

[0048] Preferably, the driving circuit 110 , the current detection unit 120 , the brightness detection unit 130 , the first detection unit, the second detection unit, and the control module 140 are all installed inside the lamp head 200 .

[0049] Preferably, a heat sink 240 for heat dissipation is further installed inside the lamp head 200. The heat sink 240 is arranged closely to the light source 210 to effectively dissipate the heat inside the lamp head 200, further ensuring the safe operation of the lighting device.

[0050] Preferably, the lighting device further comprises a chassis 400 for pivotally connecting the arm 300 , and the lamp head 200 can rotate relative to the chassis 400 around at least two dimensions.

[0051] In a preferred embodiment of the present invention, the light source 210 is an LED light source or a laser light source. The type of the light source 210 can be selected according to the actual use scenario and needs. Both light sources 210 have obvious advantages in terms of high energy efficiency, long life and environmental protection.

[0052] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A lighting device based on a current and brightness monitoring system, characterized in that: include: a light source (210) for generating light and forming a light beam; a driving circuit (110) for lighting the light source (210) and supplying power thereto; a current detection unit (120) for detecting the current of the drive circuit (110); a brightness detection unit (130) for detecting the brightness of the light beam; and a control module (140) storing a plurality of sets of corresponding relationships between current values ​​and ideal brightness values ​​of the light source (210), which is respectively connected to the current detection unit (120) and the brightness detection unit (130) by signals; The control module (140) respectively picks up the detection current value detected by the current detection unit (120) and the detection brightness value detected by the brightness detection unit (130), and compares them with the corresponding relationship, thereby determining whether the light source (210) has a fault.

2. The lighting device according to claim 1, characterized in that The light source (210) has multiple light-emitting units, each of which is driven by a group of driving circuits (110), and each driving circuit (110) performs current detection via one current detection unit (120).

3. The lighting device according to claim 1, wherein It also includes a protection circuit (150) connected to the control module (140) by signal, and disconnects the drive circuit (110) when the protection circuit (150) receives a fault signal from the control module (140).

4. The lighting device according to claim 1, wherein It also includes a focus lens (220) for adjusting the focal length of the light beam, and the brightness detection unit (130) is arranged close to the edge of the focus lens (220).

5. The lighting device according to claim 1, wherein The driving circuit (110) comprises a substrate (111), the light source (210) is mounted on the substrate (111), and the current detection unit (120) is arranged on the substrate (111).

6. The lighting device according to claim 1, characterized in that The control module (140) includes a first MCU (141) and a second MCU (142) that are signal-connected to each other; the current detection unit (120) is signal-connected to the first MCU (141) to transmit the detected current value to the first MCU (141); the brightness detection unit (130) is signal-connected to the second MCU (142) to transmit the detected brightness value to the second MCU (142); and the corresponding relationship is compared using the first MCU (141) or the second MCU (142).

7. The lighting device according to claim 1, characterized in that The current detection unit (120) comprises a current detection chip (121), wherein the current detection chip (121) has two detection current input terminals (122) connected to the drive circuit (110), two detection current output terminals (123), one input voltage terminal (124), and an AD signal output terminal (125). The current of the drive circuit (110) enters the current detection chip (121) through the detection current input terminal (122) and flows out from the detection current output terminal (123). The current detection chip (121) picks up the input current value and converts it into an AD signal representing the detection current value, and finally outputs the signal through the AD signal output terminal (125) and transmits it to the control module (140).

8. The lighting device according to claim 7, characterized in that The current detection unit (120) further includes a step-down unit (126) and a filter unit (127) connected between the current detection chip (121) and the control module (140); the AD signal output from the AD signal output end (125) is sequentially transmitted to the step-down unit (126) and the filter unit (127), and finally transmitted to the control module (140).

9. The lighting device according to claim 1, wherein: The brightness detection unit (130) comprises a light intensity detection chip (131) for detecting the brightness value of the light beam, wherein the light intensity detection chip (131) has two I2C output ports (132). After the light intensity detection chip (131) detects the brightness value of the light beam and converts it into a signal representing the detected brightness value, the signal is output to the control module (140) via the two I2C output ports (132).

10. The lighting device according to claim 1, wherein The invention also includes a lamp head (200) for mounting the light source (210) and an arm (300) for pivotally connecting the lamp head (200); an effect module (230) for intercepting the light beam and generating a corresponding light effect, a first detection unit for detecting the movement position of the effect module (230), and a second detection unit for detecting the rotation position of the lamp head (200) or the arm (300) are installed inside the lamp head (200); and the first detection unit and the second detection unit are connected to the control module (140) by signal.

11. The lighting device according to claim 1, characterized in that The light source (210) is an LED light source or a laser light source.

Images