LED driving chip and LED lamp strip

Abstract

The embodiment of the invention discloses an LED driving chip and an LED lamp strip, the LED driving chip is connected between a data input pin and a data output pin of the chip by setting a signal switch circuit, and in an initial state, the data input pin is communicated with the data output pin through the signal switch circuit, and the data output pin is communicated with the data output pin through the signal switch circuit. A data signal input by the data input pin is directly transmitted to the data output pin to be output; the signal switching control circuit is used for detecting a preset activation instruction and controlling the signal switching circuit to be switched off when the preset activation instruction is detected, so that a data signal input by the data input pin is transmitted to the data processing circuit, and the data signal is transmitted to the data output pin through the data processing circuit to be output. According to the invention, the data of the downstream driving chip can be ensured not to be interrupted without an additional bypass device when any stage of driving chip fails.

Description

Technical Field

[0001] The present invention relates to the field of LED driving technology, and in particular to an LED driving chip and an LED light strip. Background Art

[0002] Traditional single-line cascaded LED light strips typically employ a "single-point, single-pass" architecture: the controller's single data line passes through the driver chip of each LED bead in sequence, with each node sequentially interpreting its own instructions and transparently transmitting the remaining data. Failure of any single driver chip or solder joint in the chain disrupts the subsequent data flow, causing all subsequent LEDs to extinguish or freeze, resulting in widespread display loss. Common failure causes include driver chip breakdown due to static electricity or surges, power supply transient reset, LED shorts, open circuits, or poor soldering. On-site remedies typically rely on manual short-circuiting or external bypass boards, which not only increase material and maintenance costs but also make implementation difficult for long strings or packaged light strips. Summary of the Invention

[0003] The embodiments of the present invention provide an LED driver chip and an LED light strip, which can ensure that the data of the downstream driver chip is not interrupted without an additional bypass device when any level of the driver chip fails.

[0004] In order to achieve the above-mentioned object, an embodiment of the present invention provides an LED driver chip, including a data input pin, a data output pin, a data processing circuit, a signal switching circuit, and a signal switching control circuit;

[0005] The input end of the data processing circuit is connected to the data input pin, the output end of the data processing circuit is connected to the data output pin, the first end of the signal switching circuit is connected to the data input pin, the second end of the signal switching circuit is connected to the data output pin, the controlled end of the signal switching circuit is connected to the signal switching control circuit, and the signal switching control circuit is connected to the data input pin;

[0006] In the initial state, the data input pin is connected to the data output pin through the signal switching circuit, and the data signal input by the data input pin is directly transmitted to the data output pin for output; the signal switching control circuit is used to detect the preset activation instruction, and control the signal switching circuit to disconnect when the preset activation instruction is detected, so that the data signal input by the data input pin is transmitted to the data processing circuit, and then transmitted to the data output pin via the data processing circuit for output.

[0007] Furthermore, it also includes a power input pin and a ground input pin, the power input pin is used to connect to the power line, and the ground input pin is used to connect to the ground line.

[0008] Furthermore, it also includes an LED driving circuit, which includes a red output pin, a green output pin, a blue output pin and a white output pin, and the red output pin, green output pin, blue output pin and white output pin are respectively used to connect red LED lamp beads, green LED lamp beads, blue LED lamp beads and white LED lamp beads.

[0009] An embodiment of the present invention further provides an LED light strip, comprising a plurality of LED lamp bead groups and a plurality of cascaded LED driver chips corresponding one-to-one to the plurality of LED lamp bead groups, wherein each LED driver chip is used to drive a corresponding LED lamp bead group;

[0010] Each of the LED driver chips includes a data input pin, a data output pin, a data processing circuit, a signal switching circuit, and a signal switching control circuit; the input end of the data processing circuit is connected to the data input pin, the output end of the data processing circuit is connected to the data output pin, the first end of the signal switching circuit is connected to the data input pin, the second end of the signal switching circuit is connected to the data output pin, the controlled end of the signal switching circuit is connected to the signal switching control circuit, and the signal switching control circuit is connected to the data input pin;

[0011] In the initial state, the data input pin is connected to the data output pin through the signal switching circuit, and the data signal input by the data input pin is directly transmitted to the data output pin for output; the signal switching control circuit is used to detect a preset activation instruction, and when the preset activation instruction is detected, the signal switching circuit is controlled to be disconnected, so that the data signal input by the data input pin is transmitted to the data processing circuit, and then transmitted to the data output pin via the data processing circuit for output;

[0012] The data input pin of the LED driver chip of the next stage is connected to the data output pin of the LED driver chip of the previous stage, and the data input pin of the LED driver chip of the first stage is connected to the data line.

[0013] Furthermore, the LED driver chip further includes a power input pin and a ground input pin, wherein the power input pin is used to connect to a power line, and the ground input pin is used to connect to a ground line.

[0014] Furthermore, the LED driver chip also includes an LED driver circuit, the LED driver circuit includes a red output pin, a green output pin, a blue output pin and a white output pin, and the LED lamp bead group includes red LED lamp beads, green LED lamp beads, blue LED lamp beads and white LED lamp beads; the red output pin, green output pin, blue output pin and white output pin are respectively connected to the red LED lamp beads, green LED lamp beads, blue LED lamp beads and white LED lamp beads.

[0015] Beneficial effect: The LED driver chip of the present invention is connected between the data input pin and the data output pin of the chip by setting a signal switching circuit, and in the initial state, the data input pin is connected to the data output pin through the signal switching circuit, and the data signal input by the data input pin is directly transmitted to the data output pin for output; the signal switching control circuit is used to detect a preset activation instruction, and when the preset activation instruction is detected, the signal switching circuit is controlled to be disconnected, so that the data signal input by the data input pin is transmitted to the data processing circuit, and is transmitted to the data output pin via the data processing circuit for output. Therefore, the signal switching circuit is in a connected state by default, so that the data signal of the data input pin is directly transparently transmitted to the data output pin for output , so that when multiple LED driver chips are cascaded, even if a certain level of LED driver chip fails, the downstream LED driver chip can still receive the data signal. If the LED driver chip does not fail, the signal switching control circuit can detect the preset activation instruction and control the signal switch circuit to disconnect, so that the data processing circuit of the LED driver chip at this level can normally obtain the data signal to drive the lamp beads. After extracting the data signal required by this level, the data processing circuit outputs the remaining data signal from the data output pin to pass it to the next level LED driver chip. Therefore, through the above method, when any level of driver chip fails, it is possible to ensure that the data of the downstream driver chip is not interrupted without additional bypass devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solutions and beneficial effects of the present invention will be made apparent by describing in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0017] Figure 1 This is a schematic structural diagram of the LED driver chip provided by an embodiment of the present invention in the initial state;

[0018] Figure 2 This is a schematic diagram of the structure of the LED driver chip provided by an embodiment of the present invention after detecting a preset activation instruction;

[0019] Figure 3 This is a schematic structural diagram of the LED light strip provided by an embodiment of the present invention in an initial state;

[0020] Figure 4 This is a schematic diagram of a state when an LED driver chip in an LED light strip provided by an embodiment of the present invention fails. DETAILED DESCRIPTION

[0021] Please refer to the drawings, in which the same component symbols represent the same components. The principles of the present invention are illustrated by implementing them in an appropriate computing environment. The following description is based on the specific embodiments of the present invention illustrated, and should not be construed as limiting the present invention to other specific embodiments not described in detail herein.

[0022] See Figure 1 and Figure 2 The LED driver chip 100 of the embodiment of the present invention includes a data input pin 1, a data output pin 5, a data processing circuit 101, a signal switching circuit 102 and a signal switching control circuit 103.

[0023] The input end of the data processing circuit 101 is connected to the data input pin 1, the output end of the data processing circuit 101 is connected to the data output pin 5, the first end of the signal switching circuit 102 is connected to the data input pin 1, the second end of the signal switching circuit 102 is connected to the data output pin 5, and the controlled end of the signal switching circuit 102 is connected to the signal switching control circuit 103; the signal switching control circuit 103 is connected to the data input pin 1. More specifically, the signal switching circuit 102 includes a switch S, one end of the switch S is connected to the data input pin 1, the other end of the switch S is connected to the data output pin 5, and the controlled end of the switch S is connected to the signal switching control circuit 103.

[0024] In the initial state, that is, the initial state after the LED driver chip 100 is powered on, as shown in FIG. Figure 1 As shown, the switch S is in the on state by default. At this time, the data input pin 1 is connected to the data output pin 5 through the signal switch circuit 102, and the data signal input by the data input pin 1 is directly transmitted to the data output pin 5 for output; the signal switching control circuit 103 monitors the data of the data input pin 1 to detect the preset activation instruction, and controls the signal switch circuit 102 to be disconnected when the preset activation instruction is detected. Figure 2 As shown, the data signal inputted by the data input pin 1 is transmitted to the data processing circuit 101 , and is then transmitted to the data output pin 5 via the data processing circuit 101 for output.

[0025] Therefore, the signal switch circuit 102 is in a connected state by default, that is, a normally closed state, so that the data signal of the data input pin 1 is directly transmitted to the data output pin 5 for output. Therefore, when multiple LED driver chips are cascaded, even if a certain level of LED driver chip fails, the downstream LED driver chip can receive the data signal. If the LED driver chip does not fail, the signal switching control circuit 103 can detect the preset activation instruction and control the signal switch circuit 102 to be disconnected, so that the data processing circuit 101 of the current level LED driver chip can normally obtain the data signal to drive the lamp beads. After extracting the data signal required by this level, the data processing circuit 101 outputs the remaining data signal from the data output pin 5 to pass it to the next level LED driver chip. Therefore, through the above method, when any level of driver chip fails, it is possible to ensure that the data of the downstream driver chip is not interrupted without the need for additional bypass devices.

[0026] Furthermore, the LED driver chip 100 further includes a power input pin 4 and a ground input pin 8 . The power input pin 4 is used to connect to a power line, and the ground input pin 8 is used to connect to a ground line.

[0027] Furthermore, the LED driver chip 100 also includes an LED driver circuit 104, which includes a red output pin 3, a green output pin 2, a blue output pin 6 and a white output pin 7. The red output pin 3, the green output pin 2, the blue output pin 6 and the white output pin 7 are used to connect red LED lamp beads, green LED lamp beads, blue LED lamp beads and white LED lamp beads, respectively.

[0028] See Figure 3 The embodiment of the present invention further provides an LED light strip 200, comprising a plurality of LED lamp bead groups (not shown) and a plurality of cascaded LED driver chips 100 corresponding one-to-one to the plurality of LED lamp bead groups.

[0029] Each LED lamp bead group includes a red LED lamp bead, a green LED lamp bead, a blue LED lamp bead and a white LED lamp bead.

[0030] Each LED driver chip 100 is used to drive a corresponding LED lamp bead group. Figure 1 The LED driver chip of the embodiment shown, the specific structure can refer to the above embodiment. Figure 3As shown, the data input pin 1 of the next-stage LED driver chip 100 is connected to the data output pin 5 of the previous-stage LED driver chip 100, and the data input pin 1 of the first-stage LED driver chip 100 is connected to the data line DIN. The power input pin 4 of each LED driver chip 100 is connected to the power line VDD, and the ground input pin 8 is connected to the ground line GND.

[0031] In an embodiment of the present invention, the preset activation instruction is transmitted independently, which can be a pulse signal of a certain width and is not sent together with the data signal. The activation instruction is issued by the main control chip after the LED driver chip 100 is powered on to complete a self-test. If the LED driver chip 100 recognizes the activation instruction, the signal switching circuit 102 is disconnected, so that the subsequently transmitted data signal can enter the data processing circuit 101 of the LED driver chip 100; if the LED driver chip 100 fails to send, such as the power input pin 4 or the ground input pin 8 of the LED driver chip 100 is disconnected from the circuit board, a certain degree of internal damage will cause the signal switching control circuit 103 to be unable to recognize the activation instruction.

[0032] The working process of the LED light strip 200 of the present invention will be further described below:

[0033] After each LED driver chip 100 is powered on, it completes initialization and starts working. At this time, it is in the initial state. Figure 3 As shown, the signal switch circuit 102 is in the on (normally closed) state by default, and the signal switching control circuit 103 monitors the data of the data input pin 1. When no preset activation instruction is detected, after a data signal is input to the data line DIN, the signal switch circuit 102 directly transmits the data signal of the data input pin 1 to the data output pin 5, and transmits the data signal to the next-level LED driver chip 100 through the data output pin 5; when the signal switching control circuit 103 detects the preset activation instruction, the signal switching control circuit 103 controls the signal switch circuit 102 to be disconnected, so that when a data signal is input to the data line DIN After that, the data signal of the data input pin 1 is transmitted to the data processing circuit 101. After the data processing circuit 101 processes the data signal to extract the data signal required by this level, it transmits the remaining data signal to the data output pin 5, and transmits the data signal to the next level LED driver chip 100 through the data output pin 5. After the data processing circuit 101 completes the processing and output, it sends the acquired data signal to the LED driver circuit 104. The LED driver circuit 104 cooperates with the red output pin 3, the green output pin 2, the blue output pin 6 and the white output pin 7 to complete the control of the LED lamp beads of the corresponding colors. Among them, if the LED data link of the LED driver chip 100 of a certain level fails, for example, Figure 4The second-stage LED driver chip 100 shown in the figure fails. At this time, the signal switching control circuit 103 will never recognize the preset activation instruction. The signal switch circuit 102 is in the on state, which directly transmits the data signal of the data input pin 1 to the data output pin 5. The data output pin 5 transmits the data signal to the next-stage LED driver chip 100. If the LED data link of the LED driver chip 100 is working properly, the signal switching control circuit 103 will receive the preset activation instruction and then control the signal switch circuit 102 to be disconnected. Figure 4 In the illustrated first-stage LED driver chip 100 and final-stage LED driver chip 100, the data processing circuit 101 is not faulty, and the signal switching circuit 102 is in the off state, so that the data signal from data input pin 1 is transmitted to the data processing circuit 101. After processing the data signal, the data processing circuit 101 transmits the remaining data signal to the data output pin 5, which then transmits the data signal to the next-stage LED driver chip 100 via the data output pin 5. Through the above method, when a fault occurs in the LED data link of a certain stage LED driver chip 100, bypass transmission of the data signal can be ensured, avoiding the problem of subsequent lamp groups not being able to operate normally.

[0034] Therefore, the LED driver chip 100 of the present invention adopts a chip-level "single-point single-pass" fault-tolerant architecture, integrating the bypass channel and fault-tolerant logic in a single LED driver chip. No additional bypass devices are required, which can significantly reduce costs and simplify wiring, greatly improving the reliability and maintainability of long string light strips or display modules; in addition, the LED driver chip 100 defaults to a direct-through, fail-safe strategy. After power-on, the signal switching circuit 102 maintains input→output direct-through, and only enters the data processing mode when a "preset activation instruction" is detected. If the chip or its load fails and the preset activation instruction cannot be received, the link automatically remains direct-through, and the subsequent light group can still work.

[0035] Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An LED driver chip, characterized in that: It includes data input pins, data output pins, data processing circuit, signal switching circuit and signal switching control circuit; The input end of the data processing circuit is connected to the data input pin, the output end of the data processing circuit is connected to the data output pin, the first end of the signal switching circuit is connected to the data input pin, the second end of the signal switching circuit is connected to the data output pin, the controlled end of the signal switching circuit is connected to the signal switching control circuit, and the signal switching control circuit is connected to the data input pin; In the initial state, the data input pin is connected to the data output pin through the signal switching circuit, and the data signal input by the data input pin is directly transmitted to the data output pin for output; the signal switching control circuit is used to detect the preset activation instruction, and control the signal switching circuit to disconnect when the preset activation instruction is detected, so that the data signal input by the data input pin is transmitted to the data processing circuit, and then transmitted to the data output pin via the data processing circuit for output.

2. The LED driver chip according to claim 1, characterized in that: It also includes a power input pin and a ground input pin, wherein the power input pin is used to connect to the power line, and the ground input pin is used to connect to the ground line.

3. The LED driver chip according to claim 1, characterized in that: It also includes an LED driving circuit, which includes a red output pin, a green output pin, a blue output pin and a white output pin. The red output pin, green output pin, blue output pin and white output pin are respectively used to connect red LED lamp beads, green LED lamp beads, blue LED lamp beads and white LED lamp beads.

4. An LED light strip, characterized in that: It includes multiple LED lamp bead groups and multiple cascaded LED driver chips corresponding to the multiple LED lamp bead groups one by one, and each LED driver chip is used to drive a corresponding LED lamp bead group; Each of the LED driver chips includes a data input pin, a data output pin, a data processing circuit, a signal switching circuit, and a signal switching control circuit; the input end of the data processing circuit is connected to the data input pin, the output end of the data processing circuit is connected to the data output pin, the first end of the signal switching circuit is connected to the data input pin, the second end of the signal switching circuit is connected to the data output pin, the controlled end of the signal switching circuit is connected to the signal switching control circuit, and the signal switching control circuit is connected to the data input pin; In the initial state, the data input pin is connected to the data output pin through the signal switching circuit, and the data signal input by the data input pin is directly transmitted to the data output pin for output; the signal switching control circuit is used to detect a preset activation instruction, and when the preset activation instruction is detected, the signal switching circuit is controlled to be disconnected, so that the data signal input by the data input pin is transmitted to the data processing circuit, and then transmitted to the data output pin via the data processing circuit for output; The data input pin of the LED driver chip of the next stage is connected to the data output pin of the LED driver chip of the previous stage, and the data input pin of the LED driver chip of the first stage is connected to the data line.

5. The LED light strip according to claim 4, characterized in that: The LED driver chip further includes a power input pin and a ground input pin, wherein the power input pin is used to connect to a power line, and the ground input pin is used to connect to a ground line.

6. The LED driver chip according to claim 4, characterized in that: The LED driver chip also includes an LED driver circuit, which includes a red output pin, a green output pin, a blue output pin, and a white output pin. The LED lamp bead group includes red LED lamp beads, green LED lamp beads, blue LED lamp beads, and white LED lamp beads; the red output pin, green output pin, blue output pin, and white output pin are respectively connected to the red LED lamp beads, green LED lamp beads, blue LED lamp beads, and white LED lamp beads.

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