CN219609185U - LED driving current detection circuit, LED detection device and stage lamp thereof - Google Patents
LED driving current detection circuit, LED detection device and stage lamp thereof Download PDFInfo
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- CN219609185U CN219609185U CN202320367571.3U CN202320367571U CN219609185U CN 219609185 U CN219609185 U CN 219609185U CN 202320367571 U CN202320367571 U CN 202320367571U CN 219609185 U CN219609185 U CN 219609185U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The utility model provides an LED driving current detection circuit, an LED detection device and a stage lamp thereof, wherein the LED driving current detection circuit comprises: the current transformer, the first operational amplifier and the sampling resistor; the primary side of the current transformer is connected in series between the LED to be tested and the driving circuit of the LED to be tested, two ports of the secondary side of the current transformer are respectively connected with the non-inverting input end of the first operational amplifier and the inverting input end of the first operational amplifier, and the non-inverting input end is grounded; and two ports of the sampling resistor are respectively connected with the reverse input end and the output end of the first operational amplifier. According to the utility model, the driving current detection circuit is formed by connecting the current transformers in series in the driving circuit of the LED, so that the driving current of the LED can be accurately detected by effectively utilizing the mutual inductance effect of the current transformers, and the method is used for realizing damage risk prediction of the LED.
Description
Technical Field
The utility model relates to the technical field of integrated circuits, in particular to a light emitting diode (Light Emitting Diode, LED) driving current detection circuit, an LED detection device and a stage lamp thereof.
Background
Currently, LEDs have become the dominant choice for stage lighting sources. However, during the use, due to the characteristics of the LED, the LED light source may be damaged during the use, for example, the resistance value becomes large, so that the brightness is reduced, and even damage occurs over time.
Meanwhile, after the driving circuit of the LED is used for a long time, there may be a problem that short circuit or open circuit is caused by damage of some electronic components such as capacitance and resistance, and if the problems are not found and corrected in time, abnormal current of the LED may be caused, so that the LED is damaged.
The problem not only affects the lighting effect of the stage lamp, but also causes effect difference among different lamps if a plurality of lamps are operated at the same time, thereby finally affecting the overall stage effect of the stage lamp.
Disclosure of Invention
The utility model provides an LED driving current detection circuit, an LED detection device and a stage lamp thereof, which are used for solving the defects of the prior art that the LED is damaged due to abnormal current and the like, and realizing the aim of effectively detecting the LED driving current to further avoid the damage of the LED.
The utility model provides an LED driving current detection circuit, comprising: the current transformer, the first operational amplifier and the sampling resistor;
the primary side of the current transformer is connected in series between the LED to be tested and the driving circuit of the LED to be tested, two ports of the secondary side of the current transformer are respectively connected with the non-inverting input end of the first operational amplifier and the inverting input end of the first operational amplifier, and the non-inverting input end is grounded;
and two ports of the sampling resistor are respectively connected with the reverse input end of the first operational amplifier and the output end of the first operational amplifier.
According to the LED driving current detection circuit provided by the utility model, the two ports on the primary side of the current transformer are respectively connected with the positive electrode output end of the driving circuit and the positive electrode of the LED to be detected.
According to the LED driving current detection circuit provided by the utility model, the LED driving current detection circuit further comprises a first filter capacitor, wherein the positive electrode of the first filter capacitor is connected with the output end of the first operational amplifier, and the negative electrode of the first filter capacitor is grounded.
The utility model provides an LED driving current detection circuit, which also comprises a load resistor, a second operational amplifier, a feedback resistor and a gain resistor;
one end of the load resistor is connected with the output end of the first operational amplifier, and the other end of the load resistor is connected with the non-inverting input end of the second operational amplifier;
one end of the feedback resistor is connected with the output end of the second operational amplifier, the other end of the feedback resistor is connected with the reverse input end of the second operational amplifier and one end of the gain resistor, and the other end of the gain resistor is grounded.
According to the LED driving current detection circuit provided by the utility model, the LED driving current detection circuit further comprises a magnetic bead filter and/or a second filter capacitor, and the magnetic bead filter and/or the second filter capacitor is/are connected to the output end of the second operational amplifier.
The utility model also provides an LED detection device, which comprises a main control circuit and the LED driving current detection circuit, wherein the output end of the LED driving current detection circuit is connected with the main control circuit, and the main control circuit is connected with the rated current output end of the LED to be detected and the control circuit or the driving circuit of the LED to be detected.
According to the LED detection device provided by the utility model, the main control circuit comprises a micro control unit (Microcontroller Unit, MCU) and a display and alarm module, wherein the data input end of the micro control unit MCU is connected with the output end of the LED driving current detection circuit, and the signal output end of the micro control unit MCU is connected with the signal input end of the display and alarm module.
The LED detection device provided by the utility model further comprises a power management chip, wherein the power management chip is electrically connected with a power supply, a power module of the micro control unit MCU, a power driving end of the display and alarm module and a power module of the LED driving current detection circuit.
The utility model also provides a stage lamp which comprises an LED light source and the LED detection device.
According to the stage lamp provided by the utility model, the LED light sources are divided into a plurality of groups, and each group of LED detection devices detect a corresponding group of LED light sources.
According to the LED driving current detection circuit, the LED detection device and the stage lamp thereof, the driving current detection circuit is formed by connecting the current transformers in series in the driving circuit of the LED, so that the driving current of the LED can be accurately detected by effectively utilizing the mutual inductance effect of the current transformers, and the damage risk prediction of the LED is realized.
Drawings
In order to more clearly illustrate the utility model or the technical solutions of the prior art, a brief description will be given below of the drawings that are needed in the embodiments of the utility model or the description of the prior art, it being obvious that the drawings in the following description are some embodiments of the utility model and that other drawings can be obtained from these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a structure of an LED driving current detection circuit according to the present utility model;
fig. 2 is a schematic structural diagram of a current transformer in an LED driving current detection circuit according to the present utility model;
fig. 3 is a schematic diagram of communication line connection of an LED driving current detection circuit according to the present utility model;
FIG. 4 is a second schematic diagram of the LED driving current detection circuit according to the present utility model;
fig. 5 is a schematic diagram of a wiring principle of an MCU in the LED detection device according to the present utility model;
fig. 6 is a schematic diagram of a wiring principle of an RS485 communication circuit in the LED detection device according to the present utility model;
fig. 7 is a schematic diagram of a wiring principle of a power management chip in the LED inspection device according to the present utility model;
fig. 8 is a mounting position and a structural diagram of a circuit board of a current transformer in a stage lamp according to the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Aiming at the problems of LED damage and the like caused by current abnormality in the prior art, the utility model forms the driving current detection circuit by connecting the current transformer in series in the driving circuit of the LED, can effectively utilize the mutual inductance effect of the current transformer, and accurately detect the driving current of the LED so as to be used for realizing damage risk prediction of the LED. The utility model will be described and illustrated hereinafter with reference to the drawings, particularly by means of a number of embodiments.
Fig. 1 is a schematic diagram of a structure of an LED driving current detection circuit according to the present utility model, as shown in fig. 1, the circuit includes: a current transformer 101, a first operational amplifier 102 and a sampling resistor 103;
the primary side of the current transformer 101 is connected in series between the LED to be tested and the driving circuit of the LED to be tested, and two ports on the secondary side of the current transformer 101 are respectively connected with the non-inverting input end of the first operational amplifier 102 and the inverting input end of the first operational amplifier 102, and the non-inverting input end is grounded;
the two ports of the sampling resistor 103 are respectively connected with the inverting input end of the first operational amplifier 102 and the output end of the first operational amplifier 102.
It will be understood that, as shown in fig. 1, the LED driving current detection circuit of the present utility model is mainly composed of a current transformer 101, a first operational amplifier 102 and a sampling resistor 103, where P is as follows 1 -P 2 And the detection line is connected in series into a detection port of a driving circuit of the LED to be detected.
Optionally, two ports on the primary side of the current transformer are respectively connected with the positive electrode output end of the driving circuit and the positive electrode of the to-be-tested LED. Referring to fig. 2, a schematic diagram of a current transformer in an LED driving current detection circuit according to the present utility model is shown, in which a current transformer 201 includes a through hole for a circuit P to be detected 1 -P 2 Pass through, P 1 、P 2 Is a detection port. As shown in fig. 3, in the schematic diagram of connection of communication lines of the LED driving current detection circuit according to the present utility model, an LED driving current detection circuit (current collection board) 303 is installed on a positive electrode connection between an LED driving board 301 and an LED lamp 302, the LED driving board 301 includes a power input port 3011 and a data input port 3012, and the LED driving current detection circuit 303 includes a power input port 3031 and a communication data port 3032. When the LED driving current detecting circuit 303 is mounted, a line of the driving circuit to be detected is passed through the current transformer 101, so that the current passing therethrough can be detected. When the detection circuit is applied to stage lamps, the driving plate is connected with a power line and then connected with a PWM input line. When the driving board is connected with the LED to be tested, the positive output line of the driving board needs to pass through the current transformer 101, and can reach the positive input end of the LED to be tested after passing through the current transformer. The negative input line of the LED to be tested does not need to be connected with the current transformer 101 and directly returns to the output negative end of the driving plate。
After the current transformer 101 is transformed, at S 1 S 2 The end generates output current I 2 The output current I 2 After the conversion between the sampling resistor 103 and the first operational amplifier 102, a voltage V can be output out1 . Output voltage value V out1 And output current I 2 The relation of (2) is: v (V) out1 ＝I 2 R f Wherein R is f Is the resistance value of the sampling resistor 103.
From this voltage value, the output current I of the current transformer can be determined 2 And can be based on the output current I 2 Further determining the input current I of the current transformer 1 I.e. the driving current of the LED to be tested.
It will be appreciated that for different types of current transformers, the output current that is induced upon detection of the input current is different, and therefore the current transformer selected will also be in need of such. In one embodiment, the ratio of the input current of the current transformer to the output current after the mutual inductance is generated is 1:1000, such as the input current of 1A, and the current of the detection output is 1mA.
According to the LED driving current detection circuit, the driving current detection circuit is formed by connecting the current transformers in series in the driving circuit of the LED, so that the driving current of the LED can be accurately detected by effectively utilizing the mutual inductance effect of the current transformers, and the driving current detection circuit is used for predicting the damage risk of the LED.
Further, the LED driving current detection circuit according to the foregoing embodiments may optionally further include a first filter capacitor, where an anode of the first filter capacitor is connected to an output end of the first operational amplifier, and a cathode of the first filter capacitor is grounded.
It can be understood that in practical applications, due to the components in the circuit and the influence of various interference factors, the voltage Vout output by the first operational amplifier may have an unstable waveform, which may result in poor stability of the detected current result. In order to solve the problem, the utility model accesses at least one small capacitor at the output end of the first operational amplifier as a first filter capacitor, wherein the positive electrode of the first filter capacitor is directly and electrically connected with the output end of the first operational amplifier, and the negative electrode of the first filter capacitor is directly grounded.
According to the utility model, the output end of the LED driving current detection circuit is connected with the capacitor filter, so that nonlinear distortion of the circuit can be effectively reduced or avoided, and the stability of an output waveform is ensured.
Further, the LED driving current detection circuit according to the above embodiments optionally includes, as shown in fig. 4, a second schematic structural diagram of the LED driving current detection circuit provided by the present utility model, and the LED driving current detection circuit further includes a load resistor 401, a second operational amplifier 402, a feedback resistor 403, and a gain resistor 404 in addition to a current transformer 405, a first operational amplifier 406, and a sampling resistor 407 (optionally, a first filter capacitor 408 may also be included).
One end of the load resistor 401 is connected with the output end of the first operational amplifier 406, and the other end of the load resistor 401 is connected with the non-inverting input end of the second operational amplifier 402;
one end of the feedback resistor 403 is connected to the output end of the second operational amplifier 402, the other end of the feedback resistor 403 is connected to the inverting input end of the second operational amplifier 402 and one end of the gain resistor 404, and the other end of the gain resistor 404 is grounded.
It can be understood that the driving current of the LED to be tested is converted by the current transformer and the first operational amplifier, and then the current of the milliamp level is output, so that the driving current needs to be amplified for realizing control. The utility model uses an inverting amplifying circuit composed of a plurality of resistors and an operational amplifier to amplify the signal of the milliamp-level current.
As shown in fig. 4, the resistors include a load resistor 401 connected in series between the output terminal of the first operational amplifier 406 and the non-inverting input terminal of the second operational amplifier 402, a feedback resistor 403 connected in series between the output terminal of the second operational amplifier 402 and the inverting input terminal of the second operational amplifier 402, and a gain resistor 404 having one end connected to the non-inverting input terminal of the second operational amplifier 402 and the other end grounded.
The load resistor 401 is a resistive component, part or device that receives electric power at the output port of the second operational amplifier 402 instead of a terminal. The load resistor 401 is required to perform impedance matching and power matching with the output end of the LED driving current detection circuit, and is used for absorbing the unwanted electric quantity generated in the use process of the LED driving current detection circuit or playing a role of buffering.
The current of 0-3A can be converted into a direct-current voltage signal of 0-3V through the amplification of the inverting amplification circuit, and the conversion formula is as follows: u (U) out2 ＝R9/R8·U out1 Where R9 and R8 represent a feedback resistor 403 and a gain resistor 404, respectively. At the same time, voltage U out2 The driving current of the LED to be detected can be detected by simulating a signal and transmitting the signal to the MCU for calculation.
According to the utility model, the inverting amplifying circuit is formed by the plurality of resistors and the operational amplifier, and the inverting amplifying circuit is utilized to amplify the signal of the milliamp-level current, so that convenience can be brought to the detection and control of the LED abnormality.
Further, the LED driving current detection circuit according to the above embodiments may optionally further include a magnetic bead filter 409 and/or a second filter capacitor 410, as shown in fig. 4, where the magnetic bead filter 409 and/or the second filter capacitor 410 is connected to the output end of the second operational amplifier 402.
It can be understood that, after the detected current data is amplified by the two inverting amplifiers, in order to further effectively filter the interference signal and ensure the accuracy of the output signal, the output end of the second operational amplifier 402 is connected to the magnetic bead filter 409 and/or the second filter capacitor 410 according to practical application.
When only the bead filter 409 is connected, the bead filter 409 may be connected in series between the output of the second operational amplifier 402 and the load. When only the second filter capacitor 410 is connected, the positive electrode of the second filter capacitor 410 is connected to the output terminal of the second operational amplifier 402, and the negative electrode is grounded. When the magnetic bead filter 409 and the second filter capacitor 410 are connected at the same time, the magnetic bead filter 409 is connected in series between the output end of the second operational amplifier 402 and the positive electrode of the second filter capacitor 410, and the negative electrode of the second filter capacitor 410 is grounded.
For example, in the driving current sampling part, a current transformer with ZMC1118F specification may be used, the signal received by the current transformer is amplified by two inverting amplifiers, the clutter is filtered, a waveform for AD test is output for testing, and finally the signal is transmitted to the MCU after the signal is optimized by magnetic bead filtration.
According to the utility model, the magnetic bead filter and/or the second filter capacitor are/is connected to the output end of the second operational amplifier, so that the output signal can be further optimized, and the stability and accuracy of the detection result are ensured.
Based on the same inventive concept, the present utility model also provides an LED detection device according to the above embodiments, which includes a main control circuit and the LED driving current detection circuit according to any one of the above embodiments. The output end of the LED driving current detection circuit is connected with the main control circuit, and the main control circuit is connected with the rated current output end of the LED to be detected and the control circuit or the driving circuit of the LED to be detected.
It can be understood that the LED detection device of the present utility model adds a main control circuit on the basis of the LED driving current detection circuit, and the main control circuit receives the output of the inspection result of the LED driving current detection circuit and compares the output with the rated current of the LED to be detected, thereby determining whether the driving current of the LED to be detected is abnormal according to the comparison result, and further adjusting the driving control of the control circuit or the driving circuit of the LED to be detected to the LED to be detected according to the judgment result. The control circuit of the LED to be tested can be connected with the main control circuit or the driving circuit, and the control of the LED main circuit can be turned off through the control circuit and the driving circuit under the condition that the current of the LED main circuit is abnormal because the driving circuit is a circuit between the control circuit and the LED main circuit.
That is, the LED detection device of the present utility model is based on the LED driving current detection circuit of the above embodiments, and the main control circuit is configured in the above connection manner, so as to form a set of LED light source detection and protection device capable of detecting abnormality of bubble elimination (LED light source power failure) in real time. The current information transmitted to the stage light source by the drive board is read in real time through the current transformer, and the current information is directly transmitted to the main control circuit in a wiring mode. The main control circuit compares the light source specification current with the light source specification current of the internal stage lamp, and if the detected current exceeds the specification current, the main control circuit directly turns off the control port of the stage lamp to play a role in protection. Meanwhile, the main control circuit can display faults through the display screen to remind the light source circuit of abnormality.
It will be understood that the LED detection device of the present utility model includes the LED driving current detection circuit according to any one of the above embodiments, and thus the description and the definition in the LED driving current detection circuit according to the above embodiments may be used for understanding the respective constituent structures of the LED driving current detection circuit in the LED detection device of the present utility model, and specific reference may be made to the above embodiments of the detection circuit, which is not repeated herein.
According to the LED detection device, the driving current detection circuit is formed by connecting the current transformer in series in the driving circuit of the LED, and the main control circuit is arranged on the basis of the driving current detection circuit according to the determined connection mode, so that the driving current of the LED can be accurately detected, and the damage risk prediction of the LED according to the driving current is further realized.
According to the LED detection device provided in the foregoing embodiments, optionally, the main control circuit includes a micro control unit MCU and a display and alarm module, a data input end of the micro control unit MCU is connected to an output end of the LED driving current detection circuit, and a signal output end of the micro control unit MCU is connected to a signal input end of the display and alarm module.
It can be understood that the main control circuit in the utility model can be further composed of a micro control unit MCU and a display and alarm module. As shown in fig. 5, in the LED detection device according to the present utility model, the data input end of the MCU is connected to the output end of the LED driving current detection circuit, so as to receive the detection result output of the LED driving current detection circuit (i.e. the driving current of the LED to be detected), and the MCU with the AD analog function determines which current corresponds to the received data value, such as 2A, 2.5A or 2.8A, and this value is distinguished according to the given signal.
When the display and alarm module is a display screen, the MCU can be connected with the display screen through an RS485 protocol. As shown in fig. 6, in the LED detection device according to the present utility model, the signal output end of the MCU is connected to the signal input end of the display and alarm module (display screen) through the RS485 protocol, for example, in the RS485 communication portion, a driving chip of MAX14783EESA may be used to implement communication connection, so as to transmit the converted driving current signal to the display and alarm module, so that the display and alarm module further determines whether the driving current is abnormal.
That is, after receiving the data sent by the current transformer, the MCU converts the data into a signal, and then sends the signal to the display and alarm module (display screen) in the form of 485 protocol, the display and alarm module judges the signal as a main CPU, if the signal sent by the received acquisition data board is an LED normal signal, the display and alarm module will display a sign of normal function, if the signal sent by the received acquisition data board is an LED abnormal signal (such as no current or abnormal current in the LED operation time), the display and alarm module will immediately control the LED to be turned off.
Meanwhile, if the display and alarm module comprises a display screen, the LED problem can be displayed through the display screen, and a customer is reminded of replacing the internal LED. For stage lamps without a display screen, a warning lamp can be connected, and the status of the LED of an operator is prompted by displaying marks with different colors.
In the utility model, the display and alarm module is electrically connected and controls a plurality of functional modules in the stage lamp, so that the LED detection device is connected to the display and alarm module, and for most of the existing stage lamps, the detection function can be increased without changing other circuits by adopting the scheme, and the universality is stronger.
The LED detection device according to the above embodiments may further include a power management chip, where the power management chip is electrically connected to a power supply, a power module of the MCU, a power driving end of the display and alarm module, and a power module of the LED driving current detection circuit.
It can be understood that, as shown in fig. 7, in the schematic diagram of the wiring principle of the power management chip in the LED detection device provided by the present utility model, in the power supply portion of the present utility model, the power management chip (such as TD 1468) may be used as a driving power source, and the input of the power management chip may be an existing power supply, where the power supply may be a high voltage or a low voltage power source, preferably a low voltage power source, and the output voltage of the power supply is 5V, and may supply power to the power module of the LED driving current detection circuit, so as to output power to the current transformer, the operational amplifier, and the like, and the power management chip may also provide 3.3V power for the subsequent AMS1117 power module for the MCU and the power supply of the display and alarm module.
According to the utility model, the power management chip is arranged to supply power to the circuit, so that the effective and reasonable conversion, distribution and detection of the electric energy in the circuit can be realized.
As a further aspect of the utility model, the utility model also provides a stage lamp according to the embodiments described above, comprising an LED light source and an LED detection device as described in any of the embodiments described above.
It can be understood that the LED light source in the stage lamp of the present utility model may be replaced by the LED to be tested in the above embodiments, and when the LED to be tested is replaced by the LED to be tested, the wiring manner is the same as that of the LED to be tested in the above embodiments.
According to the stage lamp provided by the utility model, the driving current of the LED can be accurately detected by connecting the current transformer in series in the driving circuit of the LED to form the driving current detection circuit and arranging the main control circuit according to the determined connection mode on the basis of the driving current detection circuit, and the damage risk prediction of the LED according to the driving current can be further realized.
Optionally, the LED light sources are divided into a plurality of groups, and each group of the LED detection devices detects a corresponding group of the LED light sources.
It can be understood that, as shown in fig. 8, the installation position and the structure diagram of the circuit board of the current transformer in the stage lamp according to the present utility model are shown, wherein a plurality of LEDs to be tested may be provided, and one or more sets of LED detection devices are provided.
It will be understood by those skilled in the art that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a structure or device that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such structure or device. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a structure or device comprising the element.
In the description of the present utility model, numerous specific details are set forth. It will be appreciated, however, that embodiments of the utility model may be practiced without such specific details. In some instances, well-known structures and techniques have not been shown in detail in order not to obscure an understanding of this description. Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the utility model, various features of the utility model are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (10)
1. An LED drive current detection circuit, comprising: the current transformer, the first operational amplifier and the sampling resistor;
the primary side of the current transformer is connected in series between the LED to be tested and the driving circuit of the LED to be tested, two ports of the secondary side of the current transformer are respectively connected with the non-inverting input end of the first operational amplifier and the inverting input end of the first operational amplifier, and the non-inverting input end is grounded;
and two ports of the sampling resistor are respectively connected with the reverse input end of the first operational amplifier and the output end of the first operational amplifier.
2. The LED driving current detection circuit according to claim 1, wherein two ports on the primary side of the current transformer are connected to the positive output terminal of the driving circuit and the positive electrode of the LED under test, respectively.
3. The LED driving current detection circuit according to claim 1 or 2, further comprising a first filter capacitor, wherein an anode of the first filter capacitor is connected to an output terminal of the first operational amplifier, and a cathode of the first filter capacitor is grounded.
4. The LED driving current detection circuit according to claim 1 or 2, further comprising a load resistor, a second operational amplifier, a feedback resistor, and a gain resistor;
one end of the load resistor is connected with the output end of the first operational amplifier, and the other end of the load resistor is connected with the non-inverting input end of the second operational amplifier;
one end of the feedback resistor is connected with the output end of the second operational amplifier, the other end of the feedback resistor is connected with the reverse input end of the second operational amplifier and one end of the gain resistor, and the other end of the gain resistor is grounded.
5. The LED driving current detection circuit of claim 4, further comprising a magnetic bead filter and/or a second filter capacitor, the magnetic bead filter and/or the second filter capacitor being coupled to the output of the second operational amplifier.
6. An LED detection device, comprising a main control circuit and an LED driving current detection circuit according to any one of claims 1 to 5, wherein an output end of the LED driving current detection circuit is connected to the main control circuit, and the main control circuit is connected to a rated current output end of the LED to be detected and a control circuit or the driving circuit of the LED to be detected.
7. The LED detection device of claim 6, wherein the master control circuit comprises a micro control unit MCU and a display and alarm module, a data input end of the micro control unit MCU is connected to an output end of the LED driving current detection circuit, and a signal output end of the micro control unit MCU is connected to a signal input end of the display and alarm module.
8. The LED detection device of claim 7, further comprising a power management chip electrically connected to a power supply, a power module of the micro control unit MCU, a power driving end of the display and alarm module, and a power module of the LED driving current detection circuit.
9. Stage lamp comprising an LED light source and an LED detection device according to any of claims 6-8.
10. Stage lamp according to claim 9, wherein the LED light sources are divided into a plurality of groups, each group of the LED detection means detecting a corresponding group of the LED light sources.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320367571.3U CN219609185U (en) | 2023-02-28 | 2023-02-28 | LED driving current detection circuit, LED detection device and stage lamp thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320367571.3U CN219609185U (en) | 2023-02-28 | 2023-02-28 | LED driving current detection circuit, LED detection device and stage lamp thereof |
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| Publication Number | Publication Date |
|---|---|
| CN219609185U true CN219609185U (en) | 2023-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320367571.3U Active CN219609185U (en) | 2023-02-28 | 2023-02-28 | LED driving current detection circuit, LED detection device and stage lamp thereof |
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| Country | Link |
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| CN (1) | CN219609185U (en) |
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2023
- 2023-02-28 CN CN202320367571.3U patent/CN219609185U/en active Active
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