Device for detecting running state of LED (light-emitting diode) or LED string
By designing an operating status detection device for LEDs or LED strings, and utilizing the voltage sampling and signal processing of the main control unit and the resistor string, the problem of inaccurate current status detection in the existing technology is solved, and stable operation monitoring and safety assurance of LEDs or LED strings are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2026-03-10
AI Technical Summary
Existing technologies cannot accurately detect the operating status of LEDs or LED strings, especially the current status, leading to overheating and safety hazards.
Design an LED or LED string operation status detection device. Through a main control unit, resistors or resistor strings, signal switching module and voltage sampling, it can accurately measure the current parameters of LEDs or LED strings, including voltage sampling of resistor strings and calculation of signal duty cycle. Combined with analog-to-digital conversion module and protection circuit, it can realize stable operation monitoring of LEDs or LED strings.
It enables accurate measurement of the current parameters of LEDs or LED strings, ensuring stable operation, reducing costs, and avoiding overheating and safety hazards.
Smart Images
Figure CN121633906A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of electronics, and more particularly to a running state detection device of an LED or LED string. BACKGROUND
[0002] An LED (Light Emitting Diode) is a commonly used light-emitting device that emits light by releasing energy through the recombination of electrons and holes. LEDs are widely used in lighting and decoration fields. Therefore, the running state detection of an LED or LED string, especially the monitoring of the current state, to avoid the overheating operation of the LED or LED string and the resulting safety hazards, is a problem that needs to be addressed. SUMMARY
[0003] The technical problem to be solved by the present application is to provide a running state detection device of an LED or LED string to achieve accurate and effective detection of the running state detection of the LED or LED string.
[0004] To solve the above technical problem, the present application provides a running state detection device of an LED or LED string, comprising: a main control unit; a resistance or resistance string connected to the LED or LED string in series; and a signal switching module; the LED or LED string and the resistance or resistance string form an LED and resistance string; the two ends of the resistance or resistance string are respectively connected to the main control unit; the main control unit is also connected to the second end of the LED and resistance string; the first connection end of the signal switching module is connected to the second end of the LED and resistance string; the second connection end of the signal switching module is connected to the main control unit; wherein the main control unit is configured to provide an LED control signal to the second end of the LED and resistance string; the LED control signal passes through the signal switching module to form an LED control monitoring signal and is transmitted to the main control unit.
[0005] In an embodiment of the present application, an LED driving module is further provided between the main control unit and the second end of the LED and resistance string, and the LED control signal passes through the LED driving module to form an LED driving control signal and is transmitted to the second end of the LED and resistance string.
[0006] In an embodiment of the present application, the first end of the LED and resistance string is connected to a power supply signal.
[0007] In an embodiment of the present application, the main control unit is configured to:
[0008] when the periodic rising edge of the LED control monitoring signal is detected, the voltage sampling signal of the two ends of the resistance or resistance string is obtained;
[0009] a first voltage sampling value and a second voltage sampling value are obtained based on the voltage sampling signals at both ends of the resistor or resistor string, respectively;
[0010] an instantaneous current value is obtained according to the first voltage sampling value and the second voltage sampling value and the resistance value corresponding to the resistor or resistor string;
[0011] a corresponding signal duty cycle is obtained based on the LED control monitoring signal;
[0012] an average current value of the LED or LED string is obtained according to the instantaneous current value and the signal duty cycle.
[0013] In an embodiment of the present application, the signal switching module comprises a transistor circuit.
[0014] In an embodiment of the present application, both ends of the resistor or resistor string are connected to the main control unit through a measurement circuit, respectively.
[0015] In an embodiment of the present application, a protection circuit module is further arranged between the first connection end of the signal switching module and the second end of the LED and resistor string.
[0016] In an embodiment of the present application, the LED drive control signal is opposite to the LED control signal; and the LED control monitoring signal is opposite to the LED drive control signal.
[0017] In an embodiment of the present application, the voltage sampling signal further passes through an analog-to-digital conversion module before being transmitted to the main control unit.
[0018] In an embodiment of the present application, the first connection end corresponds to the gate of a transistor, and the second connection end corresponds to the drain of the transistor.
[0019] In an embodiment of the present application, the measurement circuit comprises resistors in series or in parallel.
[0020] In an embodiment of the present application, the protection circuit module comprises resistors, capacitors and / or voltage stabilizing tubes.
[0021] In an embodiment of the present application, the voltage conversion coefficients of the two measurement circuits connected at both ends of the resistor or resistor string are equal or proportional.
[0022] Compared with the prior art, the present application has the following advantages: through the setting, connection and operation of specific circuit modules and circuit structures, the technical solution of the present application can realize the detection of the running state of the LED or LED string, especially the accurate measurement of the current parameters of the LED or LED string, thereby realizing the stable running monitoring of the LED or LED string. BRIEF DESCRIPTION OF DRAWINGS
[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative work on the premise of not making an exception in the context.
[0024] Figure 1 is a composition schematic diagram of the running state detection device of the LED or LED string of an embodiment of the present application;
[0025] Figure 2 is a composition schematic diagram of the running state detection device of the LED or LED string of another embodiment of the present application;
[0026] Figure 3 is a composition schematic diagram of the running state detection device of the LED or LED string of another embodiment of the present application;
[0027] Figure 4 is a signal waveform schematic diagram corresponding to the running state detection device of the LED or LED string of an embodiment of the present application;
[0028] Figure 5 is a signal waveform schematic diagram corresponding to the running state detection device of the LED or LED string of another embodiment of the present application. DETAILED DESCRIPTION
[0029] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without any creative work on the premise of not making an exception are also within the scope of protection of the present application.
[0030] As shown in the present application and claims, unless the context clearly indicates otherwise, the words “one”, “an”, “a”, and / or “the” do not specify a singular form, but also include a plural form. Generally, the terms “comprise” and “include” only indicate that the steps and elements explicitly identified are included, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements.
[0031] Although the present application makes various references to some modules in the system according to the embodiments of the present application, however, any number of different modules can be used and run on the user terminal and / or server. The modules are only illustrative, and different aspects of the system and method can use different modules.
[0032] Embodiments of the present application describe a running state detection device of an LED or LED string.
[0033] Figure 1 is a schematic diagram of a running state detection device of an LED or LED string according to an embodiment of the present application. Figure 2 is a schematic diagram of a running state detection device of an LED or LED string according to another embodiment of the present application. Figure 3 is a schematic diagram of a running state detection device of an LED or LED string according to another embodiment of the present application.
[0034] Reference Figures 1 to 3 The running state detection device 100 or 200 or 300 of the LED or LED string includes a main control unit 101, a resistor or resistor string 103 connected to the LED or LED string 102 in series, and a signal switching module 131.
[0035] The LED or LED string 102 and the resistor or resistor string 103 form an LED and resistor string 112. The two ends of the resistor or resistor string 103 are respectively connected to the main control unit 101.
[0036] The main control unit 101 is also connected to the second end TN2 of the LED and resistor string 112.
[0037] The first connection end 161 of the signal switching module 131 is connected to the second end TN2 of the LED and resistor string 112, and the second connection end 162 of the signal switching module 131 is connected to the main control unit 101.
[0038] The main control unit 101 is configured to provide an LED control signal LED_CTR to the second end TN2 of the LED and resistor string 112. The LED control signal LED_CTR passes through the signal switching module 131 to form an LED control monitoring signal LED_MONT and is transmitted to the main control unit 101.
[0039] In some embodiments, an LED driving module 141 is further provided between the main control unit 101 and the second end TN2 of the LED and resistor string 112. The LED control signal LED_CTR passes through the LED driving module 141 to form an LED driving control signal LED_DR and is transmitted to the second end TN2 of the LED and resistor string 112. The LED driving module 141 is connected to a third power supply signal VDD3 and grounded GND, for example.
[0040] In some embodiments, the first end TN1 of the LED and resistor string 112 is connected to a power supply signal VDD1.
[0041] Figure 4is a signal waveform diagram corresponding to the running state detection device of the LED or LED string according to an embodiment of the present application. Figure 5 is a signal waveform diagram corresponding to the running state detection device of the LED or LED string according to another embodiment of the present application.
[0042] Reference Figures 1 to 5 In some embodiments, the main control unit 101 is configured to: when a periodic rising edge of the LED control monitoring signal LED MONT is detected, obtain a voltage sampling signal between the two ends of the resistor or resistor string 103; based on the voltage sampling signals VT1 and VT2 between the two ends of the resistor or resistor string 103, obtain a first voltage sampling value U L1 and a second voltage sampling value U L2 respectively; according to the first voltage sampling value U L1 and the second voltage sampling value U L2 , and the resistance value corresponding to the resistor or resistor string 103, obtain an instantaneous current value I inst ; based on the LED control monitoring signal LED MONT, obtain a corresponding signal duty cycle S dc ; according to the instantaneous current value I inst and the signal duty cycle S dc , obtain an average current value I ave of the LED or LED string 102.
[0043] In some embodiments, the signal duty cycle (Duty Cycle) S dc is obtained based on S dc = T on / (T on + T off ). T on is the time length corresponding to the high level of the signal, and T off is the time length corresponding to the low level of the signal. (T on + T off ) is the period value T C of the signal.
[0044] In some embodiments, the LED driving control signal LED DR is inverted with respect to the LED control signal LED CTR, and the LED control monitoring signal LED MONT is inverted with respect to the LED driving control signal LED DR. Inversion means that the period of the signal is the same, and the phase is opposite.
[0045] In some embodiments, the voltage sampling signal is further subjected to an analog to digital conversion module (ADC, Analog to Digital Converter) before being transmitted to the main control unit 101. The analog to digital conversion module (not shown in the figure) can be a discrete module, or integrated in the main control unit 101.
[0046] The signal switching module 131 includes, for example, a transistor circuit. A first connection terminal 161 corresponds to the gate of transistor Q1, and a second connection terminal 162 corresponds to the drain of transistor Q1. The drain of transistor Q1 is connected to a second power supply signal VDD2, for example, through a resistor R1.
[0047] In some embodiments, the two ends of the resistor or resistor string 103 are respectively connected to the main control unit 101 via a measurement circuit. The measurement circuit includes, for example, a first measurement circuit 151 and a second measurement circuit 152.
[0048] The first measuring circuit 151 and the second measuring circuit 152 include, for example, resistors connected in series or in parallel. For example, the first measuring circuit includes resistors R6 and R8 connected in series. The second measuring circuit includes resistors R7 and R9 connected in series. The first voltage sample value U... L 1. Based on the voltage value U corresponding to the voltage sampling signal VT1 VT 1. The values of resistors R6 and R8 are obtained. Specifically, U L1 =U VT1 / R8*(R6+R8). Second voltage sampling value U L2 Based on the voltage value U corresponding to the voltage sampling signal VT2 VT2 The value is obtained from the values of resistors R7 and R9. Specifically, U L2 =U VT2 / R9*(R7+R9). L1 and L2 represent, for example, the first and second terminals of resistor string 102, respectively.
[0049] In some embodiments, the voltage conversion coefficients of the two measurement circuits connected at both ends of the resistor or resistor string are equal or proportional. For example, when R6 = R7 and R8 = R9, the voltage conversion coefficients of the two measurement circuits are equal. The voltage conversion coefficients of the two measurement circuits are proportional, for example, in the form of a 1:2, 3:4, or 3:5 ratio.
[0050] In one embodiment, the instantaneous current value I inst Based on the first voltage sample value U L1 Second voltage sampling value U L2 The difference (U) L1 -U L2 This is obtained by combining the resistance values (R3+R4+R5) of the resistor or resistor string 103. For example, I... inst =(U L1 -U L2 ) / (R3+R4+R5).
[0051] In one embodiment, the average current value I of the LED or LED string 102 ave The instantaneous current value I inst With signal duty cycle Sdc the product of the current I and the voltage V, i.e. I ave inst dc The LED or LED string is turned on, for example, in the signal high level state after the periodic rising edge.
[0052] In some embodiments, a protection circuit module 132 is further arranged between the first connection end 161 of the signal switching module 131 and the second end TN2 of the LED and resistance string 112. The protection circuit module 132 includes resistors, capacitors and / or voltage stabilizing tubes. Referring to Figure 3 The protection circuit module 132, for example, includes a resistor R2, a capacitor C1 and a voltage stabilizing tube D1.
[0053] The running state detection device of the LED or LED string of the present application can realize the running state detection of the LED or LED string, especially the accurate measurement of the current parameter of the LED or LED string, so as to realize the stable running monitoring of the LED or LED string. Meanwhile, the present application scheme can realize the running state detection of the LED or LED string with relatively less cost.
[0054] The present application uses specific words to describe the embodiments of the present application. As "first / second embodiment", "an embodiment" and / or "some embodiments" means a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that the "an embodiment" or "one embodiment" or "an alternative embodiment" mentioned in different positions in the specification does not necessarily mean the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be properly combined.
[0055] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
[0056] The foregoing is illustrative of the present application, and is not to be construed as limiting thereof. While a number of exemplary embodiments of the application have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of the application. Accordingly, all such modifications are intended to be included within the scope of the present application as defined in the claims. It is to be understood that the above description is intended to be illustrative, and not restrictive. Many other embodiments will be apparent to those of skill in the art upon reviewing the above description. The scope of the application should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with their full scope of equivalents.
Claims
1. An operating condition detection apparatus for an LED or LED string, comprising: A main control unit; A resistance or resistance string connected with the LED or LED string in series; A signal switching module; The LED or LED string and the resistance or resistance string form an LED and resistance string; Two ends of the resistance or resistance string are respectively connected with the main control unit; The main control unit is also connected with the second end of the LED and resistance string; The first connection end of the signal switching module is connected with the second end of the LED and resistance string; the second connection end of the signal switching module is connected with the main control unit; The main control unit is configured to provide an LED control signal to the second end of the LED and resistance string; the LED control signal passes through the signal switching module to form an LED control monitoring signal and is transmitted to the main control unit.
2. The operating state detection apparatus of an LED or an LED string according to claim 1, characterized by An LED driving module is further arranged between the main control unit and the second end of the LED and resistance string; the LED control signal passes through the LED driving module to form an LED driving control signal and is transmitted to the second end of the LED and resistance string.
3. The operating state detection apparatus of an LED or an LED string according to claim 1, characterized by The first end of the LED and resistance string is connected with a power supply signal.
4. The operating state detection apparatus of an LED or an LED string according to claim 1, characterized by The main control unit is configured to: When a periodic rising edge of the LED control monitoring signal is detected, a voltage sampling signal of two ends of the resistance or resistance string is obtained; Based on the voltage sampling signal of two ends of the resistance or resistance string, a first voltage sampling value and a second voltage sampling value are respectively obtained; An instantaneous current value is obtained according to the first voltage sampling value and the second voltage sampling value and a resistance value corresponding to the resistance or resistance string; A corresponding signal duty cycle is obtained based on the LED control monitoring signal; An average current value of the LED or LED string is obtained according to the instantaneous current value and the signal duty cycle.
5. The operating state detection apparatus of an LED or an LED string according to claim 1, characterized by The signal switching module includes a transistor circuit.
6. The operating state detection apparatus of an LED or an LED string according to claim 1, characterized by Two ends of the resistance or resistance string are respectively connected to the main control unit through a measurement circuit.
7. The operating state detection apparatus of an LED or an LED string according to claim 1, characterized by A protection circuit module is further arranged between the first connection end of the signal switching module and the second end of the LED and resistance string.
8. The operating state detection apparatus of an LED or an LED string according to claim 2, characterized by The LED driving control signal is opposite to the LED control signal; the LED control monitoring signal is opposite to the LED driving control signal.
9. The operating state detection apparatus of an LED or an LED string according to claim 4, characterized by The voltage sampling signal further passes through an analog-digital conversion module before being transmitted to the main control unit.
10. The operating state detection apparatus of an LED or an LED string according to claim 5, characterized by The first connection end corresponds to a gate of a transistor, and the second connection end corresponds to a drain of the transistor.
11. The operating state detection apparatus of an LED or an LED string according to claim 6, characterized by The measurement circuit includes a resistance in series or in parallel.
12. The operating state detection apparatus of an LED or an LED string according to claim 7, characterized by The protection circuit module includes a resistance, a capacitor and / or a voltage stabilizing tube.
13. The operating state detection apparatus of an LED or an LED string according to claim 11, characterized by Voltage conversion coefficients of two measurement circuits connected at two ends of the resistance or resistance string are equal or proportional.