LED light bar and wire rod detection circuit

Abstract

The utility model belongs to the technical field of detection devices, and particularly relates to an LED light bar and wire rod detection circuit which comprises a power supply circuit, a sampling circuit, a protection circuit and a load circuit. The sampling circuit is connected with the power supply circuit and is used for acquiring voltage data of the load circuit; the protection circuit is connected with the sampling circuit and is used for disconnecting the output of the power supply circuit when the voltage of the sampling circuit is too high; the load circuit is connected with the sampling circuit. The sampling circuit comprises a plurality of sampling resistors, and each sampling resistor is connected with a load diode of the corresponding load circuit so as to acquire voltage data of each node. According to the scheme, the sampling circuit is connected with the load circuit, and the voltage data of each load diode of the load circuit is obtained through the plurality of sampling resistors, so that compared with direct current measurement in the prior art, the measurement is simpler and more convenient, and the precision is higher.

Description

Technical Field

[0001] The utility model belongs to the technical field of detection devices, and in particular relates to an LED light bar and a wire material detection circuit. Background Art

[0002] The backlight of the traditional direct-type backlight module generally does not exceed 8 channels, and has the characteristics of high voltage and low current of the light bar; for the Local Dimming module, the lamp beads will be evenly distributed to each zone for parallel processing according to the number of partitions. Each partition is a separately controlled 1-channel backlight, which has the characteristics of low voltage and high current.

[0003] LED is a device that uses the photoelectric effect to convert electrical energy into light energy. It is often used as a backlight lamp bead for liquid crystal displays. The current flowing through it determines the degree of light emission. Affected by the production process, the LED conduction voltage (Vf) is normally distributed. Lamp bead manufacturers use the difference in Vf under rated current as a basis to ship the lamp beads in different batches. However, there will be tail numbers in the production line production operations, and the unconsumed lamp beads will be left for the next batch. The electrical parameters of lamp beads in different BIN files are different. Mixing different lamp beads will cause the brightness, color and service life of the finished product to not meet the factory standards.

[0004] In order to ensure the picture quality, LD modules require the impedance of module light bars and wires produced in the same batch to be balanced; multimeter is the most commonly used test tool in the production line, but its accuracy does not meet the requirements. Therefore, it is necessary to improve the existing technology to solve the above problems. Utility Model Content

[0005] The utility model aims to provide an LED light bar and a wire material detection circuit, aiming to solve the technical problem of poor accuracy of LED testing tools in the prior art.

[0006] To achieve the above-mentioned purpose, the embodiment of the utility model provides an LED light bar and wire detection circuit, including a power supply circuit, a sampling circuit, a protection circuit and a load circuit; the sampling circuit is connected to the power supply circuit and is used to obtain the voltage data of the load circuit; the protection circuit is connected to the sampling circuit and is used to disconnect the output of the power supply circuit when the voltage of the sampling circuit is too high; the load circuit is connected to the sampling circuit;

[0007] The sampling circuit includes a plurality of sampling resistors, each of which is connected to a corresponding load diode of the load circuit to obtain voltage data of each node.

[0008] As a preferred embodiment, the load circuit includes a first terminal row and a plurality of load diodes, each of which is connected to the first terminal row; the sampling circuit also includes a second terminal row, each of which is connected to the second terminal row; the first terminal row is connected to the second terminal row so that each of the sampling resistors is connected to the corresponding load diode.

[0009] As a preferred solution, the protection circuit includes a plurality of voltage stabilizing chips, the number of the voltage stabilizing chips is equal to the number of the sampling resistors, and each of the voltage stabilizing chips is connected to a corresponding sampling resistor.

[0010] As a preferred solution, the model of the voltage stabilizing chip is TL431, the reference end of the voltage stabilizing chip is connected to one end of the corresponding sampling resistor, and the anode and cathode of the voltage stabilizing chip are both connected to the power supply circuit.

[0011] As a preferred solution, the power supply circuit includes a rectifier circuit, a step-down circuit, a management circuit and a drive circuit; the input end of the rectifier circuit is connected to an external power supply, the step-down circuit is connected to the output end of the rectifier circuit, the management circuit is connected to the step-down circuit and the rectifier circuit, and the drive circuit is connected to the step-down circuit.

[0012] As a preferred solution, the rectifier circuit includes a rectifier bridge, the step-down circuit includes a transformer, the management circuit includes a management chip, and the rectifier bridge and the management chip are both connected to the primary winding of the transformer.

[0013] As a preferred solution, the driving circuit includes a driving chip, and the driving chip is connected to the secondary winding of the transformer and the protection circuit.

[0014] The above one or more technical solutions in the LED light bar and wire detection circuit provided by the embodiment of the utility model have at least one of the following technical effects:

[0015] In this solution, a sampling circuit is set to connect to the load circuit, and voltage data of each load diode of the load circuit is obtained through multiple sampling resistors. Compared with directly measuring current in the prior art, the measurement is simpler and more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A schematic diagram of a power supply circuit of an LED light bar and a wire detection circuit provided in an embodiment of the utility model;

[0018] Figure 2 The schematic diagram of the sampling circuit and protection circuit of the LED light bar and wire material detection circuit provided in the embodiment of the utility model;

[0019] Figure 3 A load circuit schematic diagram of an LED light bar and a wire detection circuit provided in an embodiment of the utility model;

[0020] Among them, the reference numerals in the figure are:

[0021] 100 - power supply circuit, 110 - rectifier circuit, 120 - step-down circuit, 130 - management circuit, 140 - drive circuit, 200 - sampling circuit, 210 - sampling resistor, 300 - protection circuit, 310 - voltage regulator chip, 400 - load circuit, 410 - load diode. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0023] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0025] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0026] In one embodiment of the present invention, Figure 1-Figure 3 As shown, an LED light bar and wire detection circuit is provided, including a power circuit 100 , a sampling circuit 200 , a protection circuit 300 and a load circuit 400 .

[0027] The power supply circuit 100 includes a rectifier circuit 110, a step-down circuit 120, a management circuit 130, and a drive circuit 140. The input end of the rectifier circuit 110 is connected to an external power supply. The step-down circuit 120 is connected to the output end of the rectifier circuit 110. The management circuit 130 is connected to the step-down circuit 120 and the rectifier circuit 110, and the drive circuit 140 is connected to the step-down circuit 120.

[0028] Specifically, the rectifier circuit 110 includes a rectifier bridge BR1, the step-down circuit 120 includes a transformer T1, the management circuit 130 includes a management chip U1, and the rectifier bridge BR1 and the management chip U1 are both connected to the primary winding of the transformer T1. The drive circuit 140 includes a drive chip U2, and the drive chip U2 is connected to the secondary winding of the transformer T1 and the protection circuit 300.

[0029] The sampling circuit 200 is connected to the power circuit 100 and is used to obtain the voltage data of the load circuit 400. The sampling circuit 200 includes a plurality of sampling resistors 210. In this embodiment, the sampling resistors 210 include a first sampling resistor R42, a second sampling resistor R43, a third sampling resistor R44, a fourth sampling resistor R45, a fifth sampling resistor R46, a sixth sampling resistor R47 and a seventh sampling resistor R48. Each of the sampling resistors 210 is respectively connected to the corresponding load diode of the load circuit 400 to obtain the voltage data of each node. Compared with directly measuring the current in the prior art, the measurement is simpler and more accurate.

[0030] The protection circuit 300 is connected to the sampling circuit 200 and is used to disconnect the output of the power supply circuit 100 when the voltage of the sampling circuit 200 is too high. The protection circuit 300 includes a plurality of voltage stabilizing chips 310, the number of which is equal to the number of the sampling resistors 210, and each of the voltage stabilizing chips 310 is connected to the corresponding sampling resistor 210. In this embodiment, the voltage stabilizing chips 310 include a first voltage stabilizing chip D21, a second voltage stabilizing chip D22, a third voltage stabilizing chip D23, a fourth voltage stabilizing chip D24, a fifth voltage stabilizing chip D25, a sixth voltage stabilizing chip D26, and a seventh voltage stabilizing chip D27. In this embodiment, the model of the voltage stabilizing chip 310 is TL431, the reference end of the voltage stabilizing chip 310 is connected to one end of the corresponding sampling resistor 210, and the anode and cathode of the voltage stabilizing chip 310 are both connected to the power supply circuit 100.

[0031] The load circuit 400 is connected to the sampling circuit 200. The load circuit 400 includes a first terminal row J1 and a plurality of load diodes 410, each of which is connected to the first terminal row J1. The sampling circuit 200 also includes a second terminal row J2, each of which is connected to the second terminal row J2. The first terminal row J1 is connected to the second terminal row J2, so that each of the sampling resistors 210 is connected to the corresponding load diode 410. In this embodiment, there are seven load diodes 410, and accordingly, there are seven sampling resistors 210 and seven voltage stabilizing chips 310. When the number of the load diodes 410 changes, the number of the sampling resistors 210 and the voltage stabilizing chips 310 changes equally.

[0032] It should be noted that the chips provided in this application are only examples, and those skilled in the art can also select other chips as needed. It should be noted that this application is intended to protect the circuit structure. For the program control part, those skilled in the art should select appropriate circuits and chips according to the chip models in this application or as needed and perform appropriate programming to achieve the corresponding program control function in this utility model. Therefore, this part is a mature and mature technology in the prior art and is not the focus of protection of this application. Therefore, this application does not specifically elaborate on this control part.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An LED light bar and wire detection circuit, characterized in that: The invention comprises a power supply circuit, a sampling circuit, a protection circuit and a load circuit; the sampling circuit is connected to the power supply circuit and used to obtain voltage data of the load circuit; the protection circuit is connected to the sampling circuit and used to disconnect the output of the power supply circuit when the voltage of the sampling circuit is too high; the load circuit is connected to the sampling circuit; The sampling circuit includes a plurality of sampling resistors, each of which is connected to a corresponding load diode of the load circuit to obtain voltage data of each node.

2. The LED light bar and wire detection circuit according to claim 1, characterized in that: The load circuit includes a first terminal row and a plurality of load diodes, each of which is connected to the first terminal row; the sampling circuit also includes a second terminal row, each of which is connected to the second terminal row; the first terminal row is connected to the second terminal row so that each of the sampling resistors is connected to the corresponding load diode.

3. The LED light bar and wire detection circuit according to claim 1, characterized in that: The protection circuit includes a plurality of voltage stabilizing chips, the number of the voltage stabilizing chips is equal to the number of the sampling resistors, and each of the voltage stabilizing chips is connected to a corresponding sampling resistor.

4. The LED light bar and wire detection circuit according to claim 3, characterized in that: The model of the voltage stabilizing chip is TL431, the reference end of the voltage stabilizing chip is connected to one end of the corresponding sampling resistor, and the anode and cathode of the voltage stabilizing chip are both connected to the power supply circuit.

5. An LED light bar and wire detection circuit according to any one of claims 1 to 4, characterized in that: The power supply circuit includes a rectifier circuit, a step-down circuit, a management circuit and a drive circuit; the input end of the rectifier circuit is connected to an external power supply, the step-down circuit is connected to the output end of the rectifier circuit, the management circuit is connected to the step-down circuit and the rectifier circuit, and the drive circuit is connected to the step-down circuit.

6. The LED light bar and wire detection circuit according to claim 5, characterized in that: The rectifier circuit includes a rectifier bridge, the step-down circuit includes a transformer, the management circuit includes a management chip, and the rectifier bridge and the management chip are both connected to the primary winding of the transformer.

7. The LED light bar and wire detection circuit according to claim 6, characterized in that: The driving circuit includes a driving chip, and the driving chip is connected to the secondary winding of the transformer and the protection circuit.

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