LED lamp detection circuit and LED lamp driving system

Abstract

The application discloses an LED lamp detection circuit, relates to the field of LED lamp control, and mainly is used for detecting an LED lamp. The LED lamp detection circuit comprises a first power supply and a second power supply. When the LED lamp is detected, the first power supply outputs a first voltage, and the second power supply outputs a second voltage. The first voltage is greater than the second voltage, and the difference between the first voltage and the second voltage is greater than the turn-on voltage of the LED lamp, so that the LED lamp can be lighted. It can be seen that the first power supply and the second power supply are used to detect the LED lamp without using a driving chip, the situation that the LED lamp detection is failed due to the abnormality of the driving chip is avoided, and the accuracy and reliability of the LED lamp detection are improved. The application further provides an LED lamp driving system, which has the same beneficial effects as the LED lamp detection circuit described above.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of LED lamp detection, in particular to an LED lamp detection circuit and an LED lamp driving system. BACKGROUND

[0002] In the prior art, a driving chip is connected with an LED (Light-Emitting Diode) lamp to drive the LED lamp. If it is necessary to detect whether the LED lamp is abnormal, the driving chip outputs different driving currents to make the LED lamp work at different luminous efficiencies, so as to determine whether the LED lamp can work normally.

[0003] However, when the luminous efficiency of the LED lamp does not correspond to the driving current output by the driving chip, the LED lamp may be abnormal or the driving chip may be abnormal. That is, the method in the prior art cannot accurately determine whether the LED lamp is abnormal. SUMMARY

[0004] The present application aims to provide an LED lamp detection circuit and an LED lamp driving system, which can detect the LED lamp without using a driving chip, avoid the situation that the detection of the LED lamp is failed due to the abnormality of the driving chip, and improve the accuracy and reliability of the detection of the LED lamp.

[0005] To solve the above technical problems, the present application provides an LED lamp detection circuit, comprising:

[0006] a first power supply with an output end connected with a first end of an LED lamp, for outputting a first voltage when the LED lamp is detected;

[0007] a second power supply with output ends connected with a second end of the LED lamp and an output end of a driving chip respectively, for outputting a second voltage when the LED lamp is detected;

[0008] the first voltage is greater than the second voltage, and the difference between the first voltage and the second voltage is not less than the working voltage of the LED lamp.

[0009] Preferably, the LED lamp detection circuit further comprises:

[0010] a switch circuit with one end connected with the output end of the second power supply and the other end connected with the output end of the driving chip, for being turned on when the LED lamp is detected.

[0011] Preferably, the LED lamp is multiple.

[0012] The switch circuit is multiple and corresponds to the multiple LED lamps one by one.

[0013] Preferably, the switch circuit is a diode.

[0014] The cathode of the diode is connected with the output end of the second power supply, and the anode of the diode is connected with the output end of the driving chip.

[0015] Preferably, the switch circuit is a transistor.

[0016] The first end and the control end of the transistor are both connected with the output end of the second power supply, and the second end of the transistor is connected with the output end of the driving chip.

[0017] Preferably, the transistor is a P-channel metal-oxide-semiconductor (PMOS).

[0018] The gate of the PMOS is the control end of the transistor, one of the source and the drain of the PMOS is the first end of the transistor, and the other is the second end of the transistor.

[0019] Preferably, the second voltage is the power supply voltage of the driving chip.

[0020] The second end of the LED lamp and the output end of the driving chip are connected with the power supply end of the driving chip through the switch circuit.

[0021] Preferably, the second voltage is a constant value or a fluctuating value.

[0022] To solve the above technical problem, the application further provides an LED lamp system comprising the LED lamp detection circuit, and further comprising a driving chip and an LED lamp.

[0023] The application provides an LED lamp detection circuit comprising a first power supply and a second power supply.

[0024] The application further provides an LED lamp driving system, which has the same beneficial effects as the LED lamp detection circuit described above. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the prior art and embodiments will be briefly introduced as follows. Obviously, the drawings described in the following embodiments are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0026] Figure 1 A structural block diagram of an LED lamp detection circuit provided by the present application is shown in FIG. 1.

[0027] Figure 2 A specific structural block diagram of an LED lamp detection circuit provided by the present application is shown in FIG. 2.

[0028] Figure 3 A power output schematic diagram provided by the present application is shown in FIG. 3.

[0029] Figure 4 Another power output schematic diagram provided by the present application is shown in FIG. 4.

[0030] Figure 5 A specific implementation schematic diagram of a first LED lamp detection circuit provided by the present application is shown in FIG. 5.

[0031] Figure 6 A specific implementation schematic diagram of a second LED lamp detection circuit provided by the present application is shown in FIG. 6.

[0032] Figure 7 A specific implementation schematic diagram of a third LED lamp detection circuit provided by the present application is shown in FIG. 7. DETAILED DESCRIPTION

[0033] The core of the present application is to provide an LED lamp detection circuit and an LED lamp driving system, which can realize detection of an LED lamp without using a driving chip, avoid the situation of detection failure of the LED lamp due to abnormality of the driving chip, and improve the accuracy and reliability of detection of the LED lamp.

[0034] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0035] Please refer to Figure 1 , Figure 1 A structural block diagram of an LED lamp detection circuit provided by the present application is shown in FIG. 1.

[0036] The first power supply 12 is connected with the first end of the LED lamp, and is used for outputting a first voltage when the LED lamp is detected.

[0037] The second power supply 13 is connected with the second end of the LED lamp and the output end of the driving chip 11 respectively, and is used for outputting a second voltage when the LED lamp is detected.

[0038] The first voltage is greater than the second voltage, and the difference between the first voltage and the second voltage is not less than the working voltage of the LED lamp.

[0039] Specifically, in the present application, when the LED lamp is connected with the driving chip 11, one power supply is arranged at each end of the LED lamp, i.e. the first power supply 12 and the second power supply 13 described above, and then when the LED lamp needs to be detected, the first power supply 12 is controlled to output the first voltage, and the second power supply 13 is controlled to output the second voltage, so that the detection of the LED lamp can be realized without using the driving chip 11 even if the LED lamp is connected with the driving chip 11.

[0040] The first voltage is greater than the second voltage, the first power supply 12 is specifically connected with the positive electrode of the LED lamp, the second power supply 13 is specifically connected with the negative electrode of the LED lamp, and the difference between the first voltage and the second voltage is greater than the voltage at which the LED lamp is turned on, so that the voltage difference between the two can make the LED lamp normally light when the LED lamp is detected, at this time, it is determined that the LED lamp can be normally used, otherwise, it is determined that the LED lamp is abnormal and cannot be normally used.

[0041] Please refer to Figure 2 , Figure 2 for the specific structure block diagram of the LED lamp detection circuit provided by the present application.

[0042] As a preferred embodiment, the second voltage is the power supply voltage of the driving chip;

[0043] The second end of the LED lamp and the output end of the driving chip 11 are connected with the power supply end of the driving chip 11 through a switching circuit.

[0044] Further, in order to reduce the cost of the circuit and reduce the use of power supply modules as much as possible, the second voltage here can be selected as the power supply voltage of the driving chip, specifically, it can be connected with the power supply end on the driving chip 11, and then when the LED lamp needs to be detected, the first voltage output by the first power supply 12 can be directly controlled, without the need to control the second power supply 13 and without the need to additionally set the second power supply 13, which can reduce the cost of the detection circuit to a certain extent.

[0045] In addition, please refer to Figure 3 and Figure 4 , Figure 3A power output schematic provided by the present application, Figure 4 Another power output schematic provided by the present application.

[0046] Wherein, Figure 3 And Figure 4 VDD1 is the first voltage output by the first power supply 12, VDD1 is the second voltage output by the second power supply 13, the time period in which VDD1 increases corresponds to the time period of detecting the LED lamp (that is, LED failure detection), ΔV is the difference between the first voltage and the second voltage, VDD2 can be a stable voltage value (such as Figure 3 ), or a floating voltage value (such as Figure 4 ). As long as it can reliably turn on the LED lamp, this application will not be limited here.

[0047] In summary, in the present application, the first power supply 12 and the second power supply 13 can realize the detection of the LED lamp without using the driving chip 11, avoiding the situation that the detection of the LED lamp is failed due to the abnormality of the driving chip 11, and improving the accuracy and reliability of the detection of the LED lamp.

[0048] On the basis of the above embodiment:

[0049] As a preferred embodiment, it further comprises:

[0050] A switch circuit connected at one end to the output end of the second power supply 13 and at the other end to the output end of the driving chip 11, for conducting during the detection of the LED lamp.

[0051] Specifically, a switch circuit is further provided between the output end of the driving chip 11 and the second power supply 13, which is conducted when the LED lamp needs to be detected, and is in a cut-off state when the LED lamp is not detected, which can avoid the driving current output by the driving chip 11 from flowing back to the second power supply 13, preventing the influence on the second power supply 13.

[0052] Wherein, the switch circuit can be integrated inside the driving chip, such as Figure 5 At this time, there is no need to set an independent switch circuit and driving chip, which is small in size and convenient to use.

[0053] As a preferred embodiment, the LED lamp is a plurality of;

[0054] The switch circuit is a plurality, and corresponds to a plurality of LED lamps one by one.

[0055] Wherein, when the LED lamp is set to more than one, the switch circuit is also more than one, and the switch circuit corresponds to each LED lamp one by one. For example, please refer to Figure 5 、 Figure 6 andFigure 7 , Figure 5 The first LED lamp detection circuit provided by the application has the advantages that the switch circuit is integrated in the driving chip, the driving chip comprises a data receiving module, a timing control module and a current source, the data receiving module controls the current source according to the input data signal, and the timing control module controls the current source according to the input control signal, so that the corresponding driving current is output, and the LED lamp is controlled. Figure 5

[0056] Figure 6 The second LED lamp detection circuit provided by the application has the advantages that the switch circuit is integrated in the driving chip, the driving chip comprises a data receiving module, a timing control module and a current source, the data receiving module controls the current source according to the input data signal, and the timing control module controls the current source according to the input control signal, so that the corresponding driving current is output, and the LED lamp is controlled. Figure 7 The third LED lamp detection circuit provided by the application has the advantages that the switch circuit is integrated in the driving chip, the driving chip comprises a data receiving module, a timing control module and a current source, the data receiving module controls the current source according to the input data signal, and the timing control module controls the current source according to the input control signal, so that the corresponding driving current is output, and the LED lamp is controlled. Figure 5 , Figure 6 and Figure 7 In the three embodiments, three LED lamps are taken as examples, and the three LED lamps are red (R in the figure), green (G in the figure) and blue (B in the figure) lamps.

[0057] As a preferred embodiment, the switch circuit is a diode.

[0058] The cathode of the diode is connected with the output end of the second power supply 13, and the anode of the diode is connected with the output end of the driving chip 11.

[0059] The embodiment aims to provide a specific implementation mode of the switch circuit. Figure 7 Specifically, the switch circuit can be but is not limited to a diode, and the unidirectional conduction characteristic of the diode is utilized, and only when the voltage drop of the first voltage and the second voltage output by the first power supply 12 and the second power supply 13 respectively is large, the diode is turned on to realize the detection of the LED lamp.

[0060] As a preferred embodiment, the switch circuit is a transistor.

[0061] The first end and the control end of the transistor are both connected with the output end of the second power supply 13, and the second end of the transistor is connected with the output end of the driving chip 11.

[0062] The embodiment aims to provide another specific implementation mode of the switch circuit. Figure 6 Specifically, the switch circuit can be but is not limited to a transistor, and the control end is arranged in the transistor, and only when the voltage drop of the first voltage and the second voltage output by the first power supply 12 and the second power supply 13 respectively is large, specifically, when the first voltage is greater than the second voltage, the voltage difference between the control end and the second end of the transistor is large, reaches the conduction voltage of the transistor, and the transistor is turned on, thereby realizing the detection of the LED lamp.

[0063] It can be seen that the transistor in the application can realize the function of the switch circuit, and the implementation mode is simple and reliable.​

[0064] As a preferred embodiment, the transistor is a PMOS (positive channel Metal Oxide Semiconductor, P-channel metal oxide semiconductor).

[0065] The gate of the PMOS is the control end of the transistor, the drain of the PMOS is the first end of the transistor, and the source of the PMOS is the second end of the transistor.

[0066] Specifically, the transistor can be but is not limited to a PMOS tube, and the MOS tube can be a PMOS (positive channel Metal Oxide Semiconductor, P-channel metal oxide semiconductor) or an NMOS (nagetive channel Metal Oxide Semiconductor, P-channel metal oxide semiconductor). In the embodiment, the parasitic diode in the MOS tube is mainly applied. Specifically, the anode of the parasitic diode is connected with the first power supply, and the cathode of the parasitic diode is connected with the second power supply. The parasitic diode is used to realize the function of the above-mentioned switching circuit, and the implementation is simple and reliable.

[0067] To solve the above technical problems, the application further provides an LED lamp system comprising the LED lamp detection circuit, and further comprising a driving chip 11 and an LED lamp.

[0068] The driving clock internally comprises but is not limited to an input module, a timing control module, a data storage module, and an output module, wherein the input module is used to receive the control signal sent by the upper computer, the timing control module is used to generate a timing control signal according to the control signal sent by the upper computer, and the output module is used to send the timing control signal to the LED lamp to realize the driving of the LED lamp.

[0069] It should be noted that in the present specification, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0070] Those skilled in the art will further realize that the mechanisms of the various examples described herein are capable of being implemented using any number of combinations of the described features. Accordingly, these examples are not limited to the mechanisms described herein, but rather, the intent is to cover all modifications and alternatives equivalent thereto. The preceding description of the examples is illustrative, and not restrictive. Many other examples will be apparent to those of skill in the art upon reviewing the above description. The scope of the examples should, therefore, be determined not with reference to the above description, but instead should be given to the appended claims, along with their full scope of equivalents.

[0071] The above description of disclosed examples allows one of ordinary skill in the art to make and use the application. Modifications of those examples will be obvious to those of ordinary skill in the art, and the generic principles defined herein can be applied to other examples without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the examples shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An LED lamp detection circuit, characterized in that, include: The first power supply, whose output terminal is connected to the first terminal of the LED lamp, is used to output a first voltage when the LED lamp is being detected; The second power supply, whose output terminal is connected to the second terminal of the LED lamp and the output terminal of the driver chip respectively, is used to output a second voltage when the LED lamp is detected; the second voltage is the power supply voltage of the driver chip. The first voltage is greater than the second voltage, and the difference between the first voltage and the second voltage is not less than the operating voltage of the LED lamp; Also includes: A switching circuit, with one end connected to the output terminal of the second power supply and the other end connected to the output terminal of the driver chip, is used to conduct when the LED is detected; the second terminal of the LED and the output terminal of the driver chip are connected to the power supply terminal of the driver chip through the switching circuit. The switching circuit is a diode, with the cathode of the diode connected to the output terminal of the second power supply and the anode of the diode connected to the output terminal of the driver chip; or, the switching circuit is a transistor, with the first terminal and the control terminal of the transistor both connected to the output terminal of the second power supply and the second terminal of the transistor connected to the output terminal of the driver chip.

2. The LED lamp detection circuit as described in claim 1, characterized in that, The LED lights are multiple; There are multiple switching circuits, and each circuit corresponds to one of the multiple LED lights.

3. The LED lamp detection circuit as described in claim 1, characterized in that, The transistor is a P-channel metal-oxide-semiconductor (PMOS). The gate of the PMOS is the control terminal of the transistor, and one of the source and drain of the PMOS is the first terminal of the transistor, and the other is the second terminal of the transistor.

4. The LED lamp detection circuit as described in any one of claims 1-3, characterized in that, The second voltage is a constant value or a fluctuating value.

5. An LED lamp driving system, characterized in that, The device includes the LED lamp detection circuit as described in any one of claims 1-4, and also includes a driver chip and an LED lamp.

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