A UV-LED lamp bead energy compensation and lamp bead fault detection device and method

Abstract

The present invention discloses a UV-LED lamp bead energy compensation and lamp bead fault detection device and method thereof. The device has a lamp bead energy compensation function, which prolongs the service life of the UV-LED lamp bead and improves the utilization rate. At the same time, it has a UV-LED lamp bead short circuit and open circuit fault detection function. It adopts a normalized design. For UV-LED modules with different parameters, it does not need to change the circuit structure. The setting parameters can be adjusted to meet their use requirements, thereby shortening the development cycle and reducing the development cost.

Description

Technical Field

[0001] The present invention relates to the technical field of UVLE lamp beads, and in particular to a UV-LED lamp bead energy compensation and lamp bead fault detection device and method thereof. Background Art

[0002] UV-LED lamp beads are increasingly widely used due to their advantages of energy saving, environmental protection, speed, efficiency, and flexible design. For example, they are used in ink curing during printing, sterilization and antibacterial treatment of large air and water purification equipment, etc. These devices usually require very high UV-LED power. Since the power of a single UV-LED is currently less than 10W, usually only a few W, current product designs usually use a parallel design of multiple modules. A module consists of multiple LED lamp beads in series and parallel to achieve such a high power.

[0003] The existing technology mainly has the following problems:

[0004] like Figure 1 The figure shows the corresponding relationship between the radiation energy and time of UV-LED lamp beads. As the use time of UV-LED increases, the radiation dose of UV-LED decreases under the same current. When the radiation dose of UV-LED decreases to a certain extent, the radiation dose of UV-LED can no longer meet the use requirements, which means that the UV-LED fails or ends its life. The radiation illuminance is the radiation energy projected onto a unit area per unit time.

[0005] In the driving circuit and application scenarios for multiple groups of UV-LEDs, when one or more groups of LEDs are working at the same time, if any UV-LED lamp bead has an open circuit or short circuit fault, if it is not detected or discovered and repaired or shut down in time, it may cause the module to fail, and then cause the related driving circuit and adjacent modules to fail, resulting in performance degradation or complete failure, causing huge losses. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a UV-LED lamp bead energy compensation and lamp bead fault detection device and method, which has the lamp bead energy compensation function to extend the service life of the UV-LED lamp beads and improve the utilization rate. At the same time, it has the UV-LED lamp bead short circuit and open circuit fault detection function. It adopts a normalized design. For UV-LED modules with different parameters, there is no need to change the circuit structure. The setting parameters can be adjusted to meet their use requirements, shortening the development cycle and reducing development costs.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is: a UV-LED lamp bead energy compensation and lamp bead fault detection device, characterized in that it includes:

[0008] The UV-LED module is composed of several UVLED lamp beads connected in parallel, and each lamp bead string is composed of several UV-LED lamp beads connected in series;

[0009] A constant current circuit receives a control signal from the MCU control module and outputs a duty cycle of a corresponding PWM signal to adjust the input current to the UV-LED module;

[0010] The current acquisition module is used to collect the current data output by the constant current circuit to the UV-LED module and send it to the MCU control module;

[0011] The voltage acquisition module is used to collect the voltage data at both ends of the UV-LED module and send it to the MCU control module;

[0012] UV energy tester, used to collect energy data radiated by UV-LED module and send it to MCU control module;

[0013] The MCU control module is used to receive the data collected by the current acquisition module, the voltage acquisition module, and the UV energy tester, and preset the conditions for judging the fault of the UV-LED module and compensating the light radiation energy, compare the collected data with the preset judgment conditions, and output the corresponding control signal to the constant current circuit according to the comparison result;

[0014] The constant current circuit is connected to an external driving power supply, the output end of the constant current circuit is connected to the UV-LED module, the output ends of the current acquisition module, the voltage acquisition module, and the UV energy tester are connected to the input end of the MCU control module, and the control output end of the MCU control module is connected to the input end of the constant current circuit.

[0015] To achieve the above object, another technical solution adopted by the present invention is: a UV-LED lamp bead energy compensation and lamp bead fault detection method, characterized in that it includes the following steps:

[0016] a. The current acquisition module collects the current data at the output end of the constant current circuit, the voltage acquisition module collects the voltage data at both ends of the UV-LED module, and the UV energy tester collects the energy data radiated by the UV-LED module;

[0017] b. Send the data collected in step a to the MCU control module for processing;

[0018] c. The MCU control module compares the collected data with the pre-set conditions for judging UV-LED module failure and compensating light radiation energy;

[0019] d. The MCU control module outputs a control signal to the constant current circuit according to the comparison result, controls the output current of the constant current circuit, and performs energy compensation and / or lamp bead fault detection on the UV-LED module.

[0020] Specifically, the UV-LED module energy compensation steps are as follows:

[0021] e. The UV energy tester collects the real-time energy data radiated by the UV-LED module and sends it to the MCU control module for processing;

[0022] f. When the MCU control module determines that the real-time energy radiated by the UV-LED module is not greater than the preset radiation energy value, it outputs a control signal to the constant current circuit. As the current increases, the radiation power increases, and the output current of the constant current circuit is increased, so that the real-time energy radiated by the UV-LED module is equal to the preset value.

[0023] Specifically, UV-LED module fault detection includes open circuit fault detection, and the detection steps are as follows:

[0024] g. The voltage acquisition module collects the real-time voltage data at both ends of the UV-LED module in real time, and the current acquisition module collects the real-time current data at the output end of the constant current circuit in real time, and sends them to the MCU control module for processing at the same time;

[0025] h. When the MCU control module determines that the collected real-time voltage data is less than the preset voltage data, and the real-time current data is consistent with the preset current data, it outputs a control signal to the constant current circuit to control the constant current circuit output current to 0.

[0026] Specifically, UV-LED module fault detection includes short circuit fault detection, and the detection steps are as follows:

[0027] i. The voltage acquisition module collects the real-time voltage data at both ends of the UV-LED module and sends it to the MCU control module for processing;

[0028] j. When the MCU control module determines that the collected real-time voltage data is greater than the preset voltage data, and the real-time current data is consistent with the preset current data, it outputs a control signal to the constant current circuit to control the constant current circuit to output current 0.

[0029] The beneficial effects of the present invention are:

[0030] 1. The MCU control module increases the current output by the constant current circuit to improve the radiation energy of the UV-LED module, achieve energy compensation, meet the use requirements, extend the use time of the UV-LED module, and improve utilization.

[0031] 2. It has the function of UV-LED lamp bead short circuit and open circuit fault detection, and adopts normalized design. For UV-LED modules with different parameters, there is no need to change the circuit structure, and the setting parameters can be adjusted to meet their use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is the corresponding relationship between the radiation energy and time of UV-LED lamp beads;

[0033] Figure 2 This is the volt-ampere characteristic curve of UV-LED lamp beads;

[0034] Figure 3 It is a circuit diagram of the invention. DETAILED DESCRIPTION

[0035] The present invention will be further described below by means of specific examples.

[0036] See also Figure 3 As shown, the present invention provides a UV-LED lamp bead energy compensation and lamp bead fault detection device, comprising:

[0037] The UV-LED module is composed of several UVLED lamp beads connected in parallel, and each lamp bead string is composed of several UV-LED lamp beads connected in series;

[0038] A constant current circuit receives a control signal from the MCU control module and outputs a duty cycle of a corresponding PWM signal to adjust the input current to the UV-LED module;

[0039] The current acquisition module is used to collect the current data output by the constant current circuit to the UV-LED module and send it to the MCU control module;

[0040] The voltage acquisition module is used to collect the voltage data at both ends of the UV-LED module and send it to the MCU control module;

[0041] UV energy tester, used to collect energy data radiated by UV-LED module and send it to MCU control module;

[0042] The MCU control module is used to receive the data collected by the current acquisition module, the voltage acquisition module, and the UV energy tester, and preset the conditions for judging the fault of the UV-LED module and compensating the light radiation energy, compare the collected data with the preset judgment conditions, and output the corresponding control signal to the constant current circuit according to the comparison result;

[0043] The constant current circuit is connected to an external driving power supply, the output end of the constant current circuit is connected to the UV-LED module, the output ends of the current acquisition module, the voltage acquisition module, and the UV energy tester are connected to the input end of the MCU control module, and the control output end of the MCU control module is connected to the input end of the constant current circuit.

[0044] The specific fault detection function implementation method of the present invention is as follows:

[0045] Step 1: The UV-LED module is composed of N1 UV-LED lamp beads connected in parallel, one of which is composed of N2 UV-LED lamp beads connected in series, that is, the UV module is composed of N1*N2 lamp beads; the voltage of each UV-LED lamp bead is U and the current is I, then the voltage of the UV-LED module is U1=N2*U, and the current of the UV-LED module is I1=N1*I;

[0046] Step 2: When a part of the UV-LED lamp beads have an open circuit or short circuit fault due to some reasons during the use of the UV-LED module, if the fault location is not detected in time, the fault may expand and more UV-LED lamp beads may be damaged. Therefore, in order to avoid this situation and make the UV-LED lamp beads work stably for a longer time, the patent of this invention realizes the detection of current and voltage parameters in the UV-LED drive circuit;

[0047] Step 3: When a single UV-LED lamp bead has a short circuit fault, the module voltage is U2 = (N2-1) * U, and the voltage change at both ends of the module is U. The MCU control system detects the module voltage change in real time as U, determines that the lamp bead is damaged, and controls the output current of the constant current circuit to 0, so that the UV-LED lamp bead is extinguished and a fault signal is given at the same time, realizing real-time fault detection and lamp bead protection functions. Similarly, short circuit faults of multiple UV-LED lamp beads can also be detected in real time.

[0048] Step 4: When a single UV-LED lamp bead fails to open, this lamp bead string will also open, and no current will flow through it. Since the current in the constant current circuit remains unchanged, the current I of this lamp bead string will be shared by the other (N1-1) lamp bead strings. Therefore, the current of other lamp bead strings will increase. Figure 2 According to the volt-ampere characteristics of UV-LED lamp beads, the voltage will increase as the current increases. At this time, the voltage change at both ends of the UV-LED module is U3. The MCU control system detects the module voltage change as U in real time, determines that the lamp bead is damaged, and controls the output current of the constant current circuit to 0, so that the UV-LED lamp bead is extinguished and a fault signal is given at the same time, realizing the real-time fault detection and lamp bead protection function. Similarly, if multiple UV-LED lamp beads have a short circuit fault, it can also be detected in real time.

[0049] In the fifth step, the MCU control system determines that the fault signal given by the lamp bead failure is a dry node signal, which can be externally controlled to control other electrical equipment, notify other equipment to shut down, and realize the fault protection function.

[0050] The specific implementation method of the energy compensation function of the present invention is as follows:

[0051] Step 1: The UV energy tester collects the real-time energy data radiated by the UV-LED module and sends it to the MCU control module for processing;

[0052] Step 2: As attached Figure 1 As shown in the figure, as the UV-LED lamp beads are used for a longer time, the energy of the UV-LED module will decay under the same current. When the MCU control module determines that the real-time energy radiated by the UV-LED module is not greater than the preset radiation energy value, it outputs a control signal to the constant current circuit to increase the output current of the constant current circuit. As the current increases, the radiation power increases, so that the real-time energy radiated by the UV-LED module is equal to the preset value, realizing the energy compensation function, extending the use time of the UV LED lamp beads, and improving the utilization rate. .

[0053] The above implementation modes are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A UV-LED lamp bead energy compensation and lamp bead fault detection device, characterized in that: include: The UV-LED module is composed of several UVLED lamp beads connected in parallel, and each lamp bead string is composed of several UV-LED lamp beads connected in series; A constant current circuit receives a control signal from the MCU control module and outputs a duty cycle of a corresponding PWM signal to adjust the input current to the UV-LED module; The current acquisition module is used to collect the current data output by the constant current circuit to the UV-LED module and send it to the MCU control module; The voltage acquisition module is used to collect the voltage data at both ends of the UV-LED module and send it to the MCU control module; UV energy tester, used to collect energy data radiated by UV-LED module and send it to MCU control module; The MCU control module is used to receive the data collected by the current acquisition module, the voltage acquisition module, and the UV energy tester, and preset the conditions for judging the fault of the UV-LED module and compensating the light radiation energy, compare the collected data with the preset judgment conditions, and output the corresponding control signal to the constant current circuit according to the comparison result; The constant current circuit is externally connected to a driving power supply, the output end of the constant current circuit is connected to the UV-LED module, the output ends of the current acquisition module, the voltage acquisition module, and the UV energy tester are connected to the input end of the MCU control module, and the control output end of the MCU control module is connected to the input end of the constant current circuit; The method of the UV-LED lamp bead energy compensation and lamp bead fault detection device comprises the following steps: a. The current acquisition module collects the current data at the output end of the constant current circuit, the voltage acquisition module collects the voltage data at both ends of the UV-LED module, and the UV energy tester collects the energy data radiated by the UV-LED module; b. Send the data collected in step a to the MCU control module for processing; c. The MCU control module compares the collected data with the pre-set conditions for judging UV-LED module failure and compensating light radiation energy; d. The MCU control module outputs a control signal to the constant current circuit according to the comparison result, controls the output current of the constant current circuit, and performs energy compensation and / or lamp bead fault detection on the UV-LED module; The steps for UV-LED module energy compensation are as follows: e. The UV energy tester collects the real-time energy data radiated by the UV-LED module and sends it to the MCU control module for processing; f. When the MCU control module determines that the real-time energy radiated by the UV-LED module is not greater than the preset radiation energy value, it outputs a control signal to the constant current circuit to increase the output current of the constant current circuit. As the current increases, the radiation power increases, so that the real-time energy radiated by the UV-LED module is equal to the preset value; UV-LED module fault detection includes open circuit fault detection. The detection steps are as follows: g. The voltage acquisition module collects the real-time voltage data at both ends of the UV-LED module in real time, and the current acquisition module collects the real-time current data at the output end of the constant current circuit in real time, and sends them to the MCU control module for processing at the same time; h. When the MCU control module determines that the collected real-time voltage data is less than the preset voltage data, and the real-time current data is consistent with the preset current data, it outputs a control signal to the constant current circuit to control the constant current circuit output current to 0.

2. The method according to claim 1, characterized in that UV-LED module fault detection includes short circuit fault detection. The detection steps are as follows: i. The voltage acquisition module collects the real-time voltage data at both ends of the UV-LED module and sends it to the MCU control module for processing; j. When the MCU control module determines that the collected real-time voltage data is greater than the preset voltage data, and the real-time current data is consistent with the preset current data, it outputs a control signal to the constant current circuit to control the constant current circuit to output current 0.

Images