LED control circuit

Abstract

The utility model discloses a light-emitting diode (LED) control circuit, which relates to the field of LED control, and comprises a low-level control circuit comprising a plurality of LED lamps and used for receiving low-level signals sent by a body control module (BCM) controller and switching working states of the LED lamps through the low-level signals; the high-level control circuit comprises a plurality of LED lamps and is used for receiving the high-level signal sent by the BCM controller and switching the working state of each LED lamp through the high-level signal; the BCM controller is used for receiving key signals generated by the low-level control circuit and the high-level control circuit and generating a high-level signal and / or a low-level signal according to the key signals; according to the utility model, the LED control function is divided into the low-level control circuit and the high-level control circuit, so that the dependence on a complex microcontroller unit is reduced, the discrete design enables the circuit structure to be simpler, and the design difficulty and the development cost are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of LED control, especially to a LED control circuit. BACKGROUND

[0002] Under the background of the vigorous development of the automotive electronics industry, the market of various automotive electronic components has experienced explosive growth, especially in the field of automotive interior electronic control, the ingenious use of backlight and indicator light has become one of the key elements to improve user experience and product quality. Highly integrated microcontroller units (MCU) are widely used as core control components in the current market, these MCUs use their powerful programmable capabilities and rich peripheral interfaces, such as pulse width modulation (PWM) output ports or general input / output (IO) ports, to accurately control the on-off state and brightness adjustment of backlight and indicator light. However, this MCU-based control scheme, although powerful, has some shortcomings, including high cost, complex design, and limited flexibility. Therefore, the utility model aims to provide a LED control circuit that simplifies design, improves reliability, and reduces cost, achieving fast switching and stable operation of LED switches through integrated design, and effectively feedbacks the function state performed by the key. SUMMARY

[0003] In order to reduce the cost of LED control, the utility model provides a LED control circuit, comprising:

[0004] A low-level control circuit containing multiple LED lights, used to receive low-level signals sent by the BCM controller, and switch the working state of each LED light through the low-level signals;

[0005] A high-level control circuit containing multiple LED lights, used to receive high-level signals sent by the BCM controller, and switch the working state of each LED light through the high-level signals;

[0006] The BCM controller is used to receive the key signal generated by the low-level control circuit and the high-level control circuit, and generate high-level signals and / or low-level signals according to the key signal; when generating high-level signals, send high-level signals to the high-level control circuit, when generating low-level signals, send low-level signals to the low-level control circuit; when generating high-level signals and low-level signals at the same time, send high-level signals to the high-level control circuit and low-level signals to the low-level control circuit respectively.

[0007] Further, the low-level control circuit comprises a first key module, a first drive module, a first LED module, and a second LED module; wherein:

[0008] The first key module is configured to generate a key signal and send the key signal to the BCM controller; the BCM controller is configured to generate or stop generating a low-level signal according to the key signal; when the low-level signal is generated, the first driving module controls the LED lamps in the first LED module to be turned off and the LED lamps in the second LED module to be turned on; when the low-level signal is stopped to be generated, the first driving module controls the LED lamps in the first LED module to be turned on and the LED lamps in the second LED module to be turned off.

[0009] When the key signal generated by the first key module is a key open signal, the BCM controller stops to generate the low-level signal; when the key signal generated by the first key module is a key closed signal, the BCM controller generates the low-level signal.

[0010] Further, the high-level control circuit comprises a second key module, a second driving module, a third LED module and a fourth LED module; wherein:

[0011] The second key module is configured to generate a key signal and send the key signal to the BCM controller; the BCM controller is configured to generate or stop generating a high-level signal according to the key signal; when the high-level signal is generated, the second driving module controls the LED lamps in the third LED module to be turned off and the LED lamps in the fourth LED module to be turned on; when the high-level signal is stopped to be generated, the second driving module controls the LED lamps in the third LED module to be turned on and the LED lamps in the fourth LED module to be turned off.

[0012] When the key signal generated by the second key module is a key open signal, the BCM controller stops to generate the high-level signal; when the key signal generated by the first key module is a key closed signal, the BCM controller generates the high-level signal.

[0013] Further, the LED control circuit further comprises a circuit protection module, which comprises a first fuse F1.

[0014] The first key module comprises a first key SW1 and a fifth capacitor C5; wherein:

[0015] One end of the first key SW1 is connected to one end of the fifth capacitor C5 and then connected to the BCM controller; the other end of the fifth capacitor C5 is connected to one end of the first fuse F1 and then grounded; the other end of the first fuse F1 is connected to the other end of the first key SW1 and then connected to the first driving module.

[0016] Further, the first driving module comprises:

[0017] The second resistor R2, the fifteenth resistor R15, the third capacitor C3, the second diode D2, the fifth resistor R5, the sixth resistor R6, the fourth capacitor C4, and the first transistor TR1; wherein:

[0018] One end of the second resistor R2 is connected to the first LED module, and the other end is connected to one end of the fifteenth resistor R15, and then connected to the positive electrode of the second diode D2 and one end of the fifth resistor R5; the other end of the fifteenth resistor R15 is connected to one end of the third capacitor C3 and then connected to the second LED module; the negative electrode of the second diode D2 is connected to the other end of the third capacitor C3 and then connected to the BCM controller; the other end of the fifth resistor R5 is sequentially connected to one end of the sixth resistor R6 and one end of the fourth capacitor C4 and then connected to the base of the first transistor TR1; the other end of the sixth resistor R6 is connected to the other end of the fourth capacitor C4 and then connected to the emitter of the first transistor TR1; the emitter of the first transistor TR1 is also connected to one end of the first fuse F1 in the circuit protection module; and the collector of the first transistor TR1 is connected to the first LED module.

[0019] Further, the first LED module comprises:

[0020] The first resistor R1, the first LED lamp DL1, the thirteenth resistor R13, and the second capacitor C2; wherein one end of the first resistor R1 is connected to the first power supply ILL V+ and sequentially connected to one end of the thirteenth resistor R13 and one end of the second resistor R2 in the first driving module; the other end of the first resistor R1 is connected to the positive electrode of the first LED lamp DL1; the other end of the thirteenth resistor R13 is connected to the connection end of the first resistor R1 and the first LED lamp DL1 and then connected to one end of the second capacitor C2; and the other end of the second capacitor C2 is simultaneously connected to the negative electrode of the first LED lamp DL1 and the collector of the first transistor TR1.

[0021] Further, the second LED module comprises: the first diode D1, the third resistor R3, the fourth resistor R4, the fourteenth resistor R14, and the second LED lamp DL2; wherein:

[0022] The anode end of the first diode D1 is connected with the second power supply KL.15, and the cathode end is connected with one end of the third resistor R3 and one end of the fourteenth resistor R14 at the same time; the other end of the third resistor R3 is connected with one end of the fourth resistor R4; the cathode of the second LED lamp DL2 is connected with one end of the third capacitor C3 in the first driving module and the negative end of the second diode D2 at the same time, and is connected with the other end of the fourth resistor R4, and is connected with the BCM controller after being connected with the fourth resistor R4; the anode of the second LED lamp DL2 is connected with the connection end of the third resistor R3 and the fourth resistor R4 in turn, and is connected with the other end of the fourteenth resistor R14 after being connected with the connection end of the fifteenth resistor R15 and the third capacitor C3 in the first driving module.

[0023] Further, the second key module comprises: the second key SW2 and the fourth capacitor C4; wherein:

[0024] One end of the second key SW2 is connected with one end of the fourth capacitor C4, and then is connected with the BCM controller; the other end of the fourth capacitor C4 is connected with the other end of the second key SW2 at the same time that the other end of the fourth capacitor C4 is grounded, and is connected with the fourth LED module after being connected with the second key SW2.

[0025] Further, the second driving module comprises:

[0026] The second triode TR2, the third capacitor C3, the eleventh resistor R11 and the ninth resistor R9; wherein: the base of the second triode TR2 is connected with one end of the third capacitor C3, one end of the eleventh resistor R11 and one end of the ninth resistor R9 in turn; the other end of the ninth resistor R9 is connected with the fourth LED module; the other end of the eleventh resistor R11 is connected with the other end of the third capacitor C3 and the emitter of the second triode TR2 in turn, and is grounded after being connected, and is connected with the third LED module after being grounded; the collector of the second triode TR2 is connected with the third LED module.

[0027] Further, the third LED module comprises:

[0028] The third LED lamp DL3, the seventh resistor R7, the thirteenth resistor R13 and the second capacitor C2; wherein: one end of the seventh resistor R7 is connected with one end of the thirteenth resistor R13 at the same time that the one end of the seventh resistor R7 is connected with the first power supply ILL V+; the other end of the thirteenth resistor R13 is connected with one end of the second capacitor C2; the other end of the seventh resistor R7 is connected with the connection end of the thirteenth resistor R13 and the second capacitor C2, the anode end of the third LED lamp DL3 and the collector of the second triode TR2 in the second driving module at the same time; the other end of the second capacitor C2 is connected with the cathode end of the third LED lamp DL3, and is grounded after being connected;

[0029] The fourth LED module comprises a tenth resistor R10, a fourteenth resistor R14, a twelfth resistor R12, a fourth LED lamp DL4 and a second capacitor C2.

[0030] The negative electrode of the fourth LED lamp DL4 is connected to one end of a second button SW2 in a second button module and one end of a fourth capacitor C4 in sequence and then grounded; one end of the second capacitor C2 is connected to the connection end of the fourth LED lamp DL4 and the second button module, one end of the twelfth resistor R12 and one end of a first capacitor C1 in sequence; the positive electrode of the fourth LED lamp DL4 is connected to one end of the fourteenth resistor R14; the other end of the second capacitor C2 is connected to the connection end of the fourth LED lamp DL4 and the fourteenth resistor R14; the other end of the twelfth resistor R12 is connected to the connection end of the fourth LED lamp DL4 and the fourteenth resistor R14 and one end of the tenth resistor R10 in sequence; one end of the eighth resistor R8 is connected to the other end of the tenth resistor R10, the other end of the fourteenth resistor R14 and one end of a ninth resistor R9 in a second driving module in sequence; the other end of the eighth resistor R8 is connected to the other end of the first capacitor C1 and then connected to a BCM controller.

[0031] Compared with the prior art, the utility model at least has the following beneficial effects:

[0032] (1) The utility model discloses: contain a plurality of LED lamps's low level control circuit, be used for receiving the low level signal that BCM controller sends, and pass through the working condition of low level signal switching each LED lamp, contain a plurality of LED lamps's high level control circuit, be used for receiving the high level signal that BCM controller sends, and pass through the working condition of high level signal switching each LED lamp, the BCM controller is used for receiving the button signal that low level control circuit and high level control circuit produce, and according to button signal generates high level signal and / or low level signal, that is, the utility model passes through the LED control function is divided into low level control circuit and high level control circuit, reduced the dependence on complex microcontroller unit (MCU), and this kind of separate design makes the circuit structure more simple, reduces the design difficulty and development cost,

[0033] (2) compared with the traditional MCU control scheme, the utility model passes through the control of simple logic circuit LED lamp, reduces the component quantity required, thereby reduces the circuit cost,

[0034] (3) the integrated circuit protection module can immediately cut off the relevant circuit when detecting overcurrent, overvoltage and other abnormal conditions, prevent the fault from expanding, ensure the safety and stability of the vehicle electrical system,

[0035] (4) The BCM controller generates high level and / or low level signals according to the key signals, and the working states of different LED lamps can be flexibly controlled; this design allows the working states of the LED lamps to be quickly switched in different application scenarios, and enhances the user experience. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 A low level control circuit diagram of the embodiment of the utility model;

[0037] Figure 2 A high level control circuit diagram of the embodiment of the utility model. DETAILED DESCRIPTION

[0038] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0039] In order to reduce the design difficulty and development cost of LED control, the utility model provides an LED control circuit, which comprises:

[0040] The low level control circuit comprising a plurality of LED lamps is used for receiving the low level signals sent by the BCM controller and switching the working states of the LED lamps through the low level signals.

[0041] The high level control circuit comprising a plurality of LED lamps is used for receiving the high level signals sent by the BCM controller and switching the working states of the LED lamps through the high level signals.

[0042] The BCM controller is used for receiving the key signals generated by the low level control circuit and the high level control circuit, and generating high level signals and / or low level signals according to the key signals; when the high level signals are generated, the high level signals are sent to the high level control circuit, and when the low level signals are generated, the low level signals are sent to the low level control circuit; when the high level signals and the low level signals are simultaneously generated, the high level signals are sent to the high level control circuit and the low level signals are sent to the low level control circuit.

[0043] As shown in Figure 1 The low level control circuit comprises a first key module, a first driving module, a first LED module and a second LED module; wherein:

[0044] The first key module is used for generating a key signal and sending to the BCM controller; the BCM controller is used for generating or stopping generating a low level signal according to the key signal; when the low level signal is generated, the first driving module controls the LED lamp in the first LED module to be off and the LED lamp in the second LED module to be on; when the low level signal is stopped to be generated, the first driving module controls the LED lamp in the first LED module to be on and the LED lamp in the second LED module to be off.

[0045] When the key signal generated by the first key module is a key disconnection signal, the BCM controller stops generating the low level signal; when the key signal generated by the first key module is a key closure signal, the BCM controller generates the low level signal.

[0046] The LED control circuit further comprises a circuit protection module, which comprises a first fuse F1.

[0047] The first key module comprises a first key SW1 and a fifth capacitor C5; wherein:

[0048] One end of the first key SW1 is connected to one end of the fifth capacitor C5 and then connected to the BCM controller; the other end of the fifth capacitor C5 is connected to one end of the first fuse F1 and then grounded; the other end of the first fuse F1 is connected to the other end of the first key SW1 and then connected to the first driving module.

[0049] It should be noted that the circuit protection module is specially set in the utility model, so that when overcurrent, overvoltage and other abnormal conditions are detected, the related circuits (including each LED module, each driving module and each key module) can be immediately cut off, thereby preventing the fault from expanding and ensuring the safety of the vehicle electrical system.

[0050] When the current through the self-restoring fuse (i.e. the first fuse F1) is lower than its rated value, the fuse remains in a low resistance state, and the circuit works normally. Once the current or voltage exceeds the rated value, the self-restoring fuse will quickly increase its resistance and enter a high resistance state, thereby cutting off the circuit. This high resistance state effectively prevents current from passing through and protects the subsequent circuit from damage. When the abnormal condition is eliminated and the current returns to normal and is lower than the rated value, the self-restoring fuse will automatically return to the low resistance state, and the circuit will resume normal operation.

[0051] The self-restoring fuse has a fast response characteristic, can react to abnormal conditions within milliseconds, ensures timely cutting off the circuit, and prevents fault propagation. In addition, since the self-restoring fuse can automatically restore after the abnormal condition is eliminated, manual intervention is not required to replace the fuse, and the reliability and maintenance convenience of the system are improved. That is, by adding the self-restoring fuse in the circuit, the utility model can effectively deal with abnormal conditions such as overcurrent and overvoltage, ensure the safe operation of the circuit, and improve the reliability and safety of the circuit.

[0052] The first driving module comprises:

[0053] The second resistor R2, the fifteenth resistor R15, the third capacitor C3, the second diode D2, the fifth resistor R5, the sixth resistor R6, the fourth capacitor C4, and the first transistor TR1; wherein:

[0054] One end of the second resistor R2 is connected to the first LED module, and the other end is connected to one end of the fifteenth resistor R15, and then connected to the positive electrode of the second diode D2 and one end of the fifth resistor R5; the other end of the fifteenth resistor R15 is connected to one end of the third capacitor C3, and then connected to the second LED module; the negative electrode of the second diode D2 is connected to the other end of the third capacitor C3, and then connected to the BCM controller; the other end of the fifth resistor R5 is sequentially connected to one end of the sixth resistor R6 and one end of the fourth capacitor C4, and then connected to the base of the first transistor TR1; the other end of the sixth resistor R6 is connected to the other end of the fourth capacitor C4, and then connected to the emitter of the first transistor TR1; the emitter of the first transistor TR1 is also connected to one end of the first fuse F1 in the circuit protection module; and the collector of the first transistor TR1 is connected to the first LED module.

[0055] The first LED module comprises:

[0056] The first resistor R1, the first LED lamp DL1, the thirteenth resistor R13, and the second capacitor C2; wherein one end of the first resistor R1 is connected to the first power supply ILL V+ and sequentially connected to one end of the thirteenth resistor R13 and one end of the second resistor R2 in the first driving module; the other end of the first resistor R1 is connected to the positive electrode of the first LED lamp DL1; the other end of the thirteenth resistor R13 is connected to the connection end of the first resistor R1 and the first LED lamp DL1, and then connected to one end of the second capacitor C2; and the other end of the second capacitor C2 is simultaneously connected to the negative electrode of the first LED lamp DL1 and the collector of the first transistor TR1.

[0057] The second LED module comprises: the first diode D1, the third resistor R3, the fourth resistor R4, the fourteenth resistor R14, and the second LED lamp DL2; wherein:

[0058] The positive terminal of the first diode D1 is connected with the second power supply KL.15, and the negative terminal is connected with one end of the third resistor R3 and one end of the fourteenth resistor R14 at the same time; the other end of the third resistor R3 is connected with one end of the fourth resistor R4; the negative terminal of the second LED lamp DL2 is connected with one end of the third capacitor C3 in the first driving module and the negative terminal of the second diode D2 at the same time, and is connected with the other end of the fourth resistor R4 after being connected with the fourth resistor R4, and is connected with the BCM controller after being connected with the fourth resistor R4; the positive terminal of the second LED lamp DL2 is connected with the connection end of the third resistor R3 and the fourth resistor R4 in turn, and is connected with the other end of the fourteenth resistor R14 after being connected with the connection end of the fifteenth resistor R15 and the third capacitor C3 in the first driving module.

[0059] Specifically:

[0060] When the first button SW1 is not pressed, the current flows as follows:

[0061] The current passes through the resistor R2 and then the resistor R5 from the power supply "ILL_V+" to the base of the transistor TR1. Since the base of TR1 receives sufficient current, TR1 is turned on (i.e., TR1 is open).

[0062] After TR1 is turned on, the path between its collector and emitter becomes a low resistance state, allowing current to pass through.

[0063] The current continues to pass through the collector of TR1, flows through the LED DL1, and finally returns to the ground (GND). In this way, DL1 is lit up.

[0064] The design ensures that DL1 can remain lit when there is no button operation, providing a stable indication.

[0065] When the first button SW1 is pressed, the current flows as follows:

[0066] When SW1 is pressed, the switch will feed back a signal to the external BCM controller, Figure 1 marked as "HDC".

[0067] After the BCM controller receives this signal, it will generate a low-level signal and send it to the low-level control circuit through the "HDC_IND" pin.

[0068] After the low-level control circuit receives the low-level signal, the path of the current changes. Specifically, the current passes through the resistor R2 and then the diode D2 from the power supply "ILL_V+" to "HDC_IND"; since the base of TR1 does not have enough current to turn it on, TR1 is turned off (i.e., TR1 is cut off).

[0069] After the TR1 is turned off, the loop of the DL1 is cut off, so the DL1 is turned off, while the DL2 is turned on.

[0070] As shown in the figure, the high-level control circuit comprises a second key module, a second driving module, a third LED module and a fourth LED module. Figure 2

[0071] The second key module is configured to generate a key signal and send the key signal to the BCM controller.

[0072] When the key signal generated by the second key module is a key open signal, the BCM controller stops generating the high-level signal.

[0073] The second key module comprises a second key SW2 and a fourth capacitor C4.

[0074] One end of the second key SW2 is connected to one end of the fourth capacitor C4, and then the second key SW2 is connected to the BCM controller.

[0075] The other end of the fourth capacitor C4 is connected to the other end of the second key SW2, and then the fourth capacitor C4 is connected to the fourth LED module.

[0076] The second driving module comprises:

[0077] A second triode TR2, a third capacitor C3, an eleventh resistor R11 and a ninth resistor R9.

[0078] The third LED module comprises:

[0079] ​The third LED lamp DL3, the seventh resistor R7, the thirteenth resistor R13 and the second capacitor C2; wherein: one end of the seventh resistor R7 is connected to the first power supply ILL V+ and connected to one end of the thirteenth resistor R13; the other end of the thirteenth resistor R13 is connected to one end of the second capacitor C2; the other end of the seventh resistor R7 is connected to: the connection end of the thirteenth resistor R13 and the second capacitor C2, the positive electrode end of the third LED lamp DL3 and the collector of the second triode TR2 in the second driving module; the other end of the second capacitor C2 is connected to the negative electrode end of the third LED lamp DL3 and grounded.

[0080] The fourth LED module includes: the tenth resistor R10, the fourteenth resistor R14, the twelfth resistor R12, the fourth LED lamp DL4 and the second capacitor C2; wherein:

[0081] The negative electrode of the fourth LED lamp DL4 is connected to one end of the second key SW2 in the second key module and one end of the fourth capacitor C4 and grounded; one end of the second capacitor C2 is connected to: the connection end of the fourth LED lamp DL4 and the second key module, one end of the twelfth resistor R12 and one end of the first capacitor C1; the positive electrode of the fourth LED lamp DL4 is connected to one end of the fourteenth resistor R14; the other end of the second capacitor C2 is connected to: the connection end of the fourth LED lamp DL4 and the fourteenth resistor R14; the other end of the twelfth resistor R12 is connected to: the connection end of the fourth LED lamp DL4 and the fourteenth resistor R14, one end of the tenth resistor R10; one end of the eighth resistor R8 is connected to: the other end of the tenth resistor R10, the other end of the fourteenth resistor R14 and one end of the ninth resistor R9 in the second driving module; the other end of the eighth resistor R8 is connected to the other end of the first capacitor C1 and grounded to the BCM controller.

[0082] Figure 2 In the second key module, the key signal generated is marked as REAR_ADL, and REAR_ADL_IND in the figure represents the pin connected to the BCM controller.

[0083] The utility model discloses a low level control circuit of multiple LED lamps, for receiving the low level signal of BCM controller sending, and through low level signal switching the working condition of each LED lamp, the high level control circuit of multiple LED lamps, for receiving the high level signal of BCM controller sending, and through high level signal switching the working condition of each LED lamp, the BCM controller is used to receive the key signal of low level control circuit and high level control circuit generation, and according to key signal generates high level signal and / or low level signal, namely, the utility model discloses through the low level control circuit and high level control circuit of LED control function division, reduced the dependence to complex microcontroller unit (MCU), and this kind of separate design makes the circuit structure more simple, reduced the design difficulty and development cost.

[0084] It should be noted that all directional indications, such as upper, lower, left, right, front, back, etc., in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0085] In addition, the descriptions such as "first", "second", "one" and the like in the utility model are only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc. unless otherwise specifically limited.

[0086] In the utility model, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be understood broadly, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0087] In addition, the technical solutions of each embodiment of the utility model can be combined with each other, but it must be based on that ordinary skilled in the art can realize, when the combination of technical solutions appears mutual contradiction or cannot be realized, it should be considered that the combination of technical solutions does not exist, also not in the protection scope required by the utility model.

Claims

1. An LED control circuit, characterized by, The application relates to an LED control circuit. The low-level control circuit comprises a plurality of LED lamps and is used for receiving a low-level signal sent by a BCM controller and switching the working states of the LED lamps through the low-level signal. The high-level control circuit comprises a plurality of LED lamps and is used for receiving a high-level signal sent by the BCM controller and switching the working states of the LED lamps through the high-level signal. The BCM controller is used for receiving key signals generated by the low-level control circuit and the high-level control circuit and generating a high-level signal and / or a low-level signal according to the key signals; when the high-level signal is generated, the high-level signal is sent to the high-level control circuit; when the low-level signal is generated, the low-level signal is sent to the low-level control circuit; when the high-level signal and the low-level signal are simultaneously generated, the high-level signal is sent to the high-level control circuit and the low-level signal is sent to the low-level control circuit.

2. The LED control circuit of claim 1, wherein, The low-level control circuit comprises a first key module, a first driving module, a first LED module and a second LED module. The first key module is used for generating a key signal and sending the key signal to the BCM controller; the BCM controller is used for generating or stopping generating a low-level signal according to the key signal; when the low-level signal is generated, the first driving module controls the LED lamps in the first LED module to be extinguished and the LED lamps in the second LED module to be lighted; when the low-level signal is stopped from being generated, the first driving module controls the LED lamps in the first LED module to be lighted and the LED lamps in the second LED module to be extinguished. When the key signal generated by the first key module is a key disconnection signal, the BCM controller stops generating the low-level signal; when the key signal generated by the first key module is a key closure signal, the BCM controller generates the low-level signal.

3. An LED control circuit according to claim 2, wherein, The high-level control circuit comprises a second key module, a second driving module, a third LED module and a fourth LED module. The second key module is used for generating a key signal and sending the key signal to the BCM controller; the BCM controller is used for generating or stopping generating a high-level signal according to the key signal; when the high-level signal is generated, the second driving module controls the LED lamps in the third LED module to be extinguished and the LED lamps in the fourth LED module to be lighted; when the high-level signal is stopped from being generated, the second driving module controls the LED lamps in the third LED module to be lighted and the LED lamps in the fourth LED module to be extinguished. When the key signal generated by the second key module is a key disconnection signal, the BCM controller stops generating the high-level signal; when the key signal generated by the first key module is a key closure signal, the BCM controller generates the high-level signal.

4. The LED control circuit of claim 2, wherein, The LED control circuit further comprises a circuit protection module which comprises a first fuse F1. The first key module comprises a first key SW1 and a fifth capacitor C5. The first key module comprises a first key SW1 and a fifth capacitor C5. One end of the first button SW1 is connected to one end of the fifth capacitor C5 and then connected to the BCM controller; the other end of the fifth capacitor C5 is connected to one end of the first fuse F1 and then grounded; the other end of the first fuse F1 is connected to the other end of the first button SW1 and then connected to the first drive module.

5. An LED control circuit according to claim 4, wherein, The first drive module comprises: a second resistor R2, a fifteenth resistor R15, a third capacitor C3, a second diode D2, a fifth resistor R5, a sixth resistor R6, a fourth capacitor C4, and a first transistor TR1; wherein: One end of the second resistor R2 is connected to the first LED module, and the other end is connected to one end of the fifteenth resistor R15 and then connected to the positive electrode of the second diode D2 and one end of the fifth resistor R5; the other end of the fifteenth resistor R15 is connected to one end of the third capacitor C3 and then connected to the second LED module; the negative electrode of the second diode D2 is connected to the other end of the third capacitor C3 and then connected to the BCM controller; the other end of the fifth resistor R5 is sequentially connected to one end of the sixth resistor R6 and one end of the fourth capacitor C4 and then connected to the base of the first transistor TR1; the other end of the sixth resistor R6 is connected to the other end of the fourth capacitor C4 and then connected to the emitter of the first transistor TR1; the emitter of the first transistor TR1 is also connected to one end of the first fuse F1 in the circuit protection module; the collector of the first transistor TR1 is connected to the first LED module.

6. An LED control circuit according to claim 5, wherein, The first LED module comprises: a first resistor R1, a first LED lamp DL1, a thirteenth resistor R13, and a second capacitor C2; wherein: one end of the first resistor R1 is connected to the first power supply ILL V+ and then sequentially connected to one end of the thirteenth resistor R13 and one end of the second resistor R2 in the first drive module; the other end of the first resistor R1 is connected to the positive electrode of the first LED lamp DL1; the other end of the thirteenth resistor R13 is connected to the connection end of the first resistor R1 and the first LED lamp DL1 and then connected to one end of the second capacitor C2; the other end of the second capacitor C2 is simultaneously connected to the negative electrode of the first LED lamp DL1 and the collector of the first transistor TR1.

7. An LED control circuit according to claim 6, wherein, The second LED module comprises: a first diode D1, a third resistor R3, a fourth resistor R4, a fourteenth resistor R14, and a second LED lamp DL2; wherein: The positive terminal of the first diode D1 is connected with the second power supply KL.15, and the negative terminal is connected with one end of the third resistor R3 and one end of the fourteenth resistor R14; the other end of the third resistor R3 is connected with one end of the fourth resistor R4; the negative terminal of the second LED lamp DL2 is connected with one end of the third capacitor C3 in the first driving module and the negative terminal of the second diode D2, and is connected with the other end of the fourth resistor R4 after being connected with the fourth resistor R4, and is connected with the BCM controller after being connected with the fourth resistor R4; the positive terminal of the second LED lamp DL2 is connected with the connection end of the third resistor R3 and the fourth resistor R4, the connection end of the fifteenth resistor R15 and the third capacitor C3 in the first driving module, and is connected with the other end of the fourteenth resistor R14 after being connected with the connection end of the third resistor R3 and the fourth resistor R4, the connection end of the fifteenth resistor R15 and the third capacitor C3 in the first driving module.

8. The LED control circuit of claim 3, wherein, The second key module comprises a second key SW2 and a fourth capacitor C4; wherein: One end of the second key SW2 is connected with one end of the fourth capacitor C4, and the other end of the fourth capacitor C4 is connected with the ground while being connected with the other end of the second key SW2, and the fourth LED module is connected after being connected with the second key SW2.

9. An LED control circuit as claimed in claim 8, wherein, The second driving module comprises: A second triode TR2, a third capacitor C3, an eleventh resistor R11 and a ninth resistor R9; wherein: the base of the second triode TR2 is connected with one end of the third capacitor C3, one end of the eleventh resistor R11 and one end of the ninth resistor R9 in sequence; the other end of the ninth resistor R9 is connected with the fourth LED module; the other end of the eleventh resistor R11 is connected with the other end of the third capacitor C3 and the emitter of the second triode TR2 in sequence and is connected with the ground after being connected, and the third LED module is connected after being connected with the ground; the collector of the second triode TR2 is connected with the third LED module.

10. The LED control circuit of claim 9, wherein, The third LED module comprises: A third LED lamp DL3, a seventh resistor R7, a thirteenth resistor R13 and a second capacitor C2; wherein: one end of the seventh resistor R7 is connected with the first power supply ILL V+ and one end of the thirteenth resistor R13; the other end of the thirteenth resistor R13 is connected with one end of the second capacitor C2; the other end of the seventh resistor R7 is connected with the connection end of the thirteenth resistor R13 and the second capacitor C2, the positive terminal of the third LED lamp DL3 and the collector of the second triode TR2 in the second driving module; the other end of the second capacitor C2 is connected with the negative terminal of the third LED lamp DL3 and is connected with the ground after being connected; The fourth LED module comprises: a tenth resistor R10, a fourteenth resistor R14, a twelfth resistor R12, a fourth LED lamp DL4 and a second capacitor C2; wherein: The negative electrode of the fourth LED lamp DL4 is connected with one end of the second button SW2 in the second button module, one end of the fourth capacitor C4, and then grounded; one end of the second capacitor C2 is connected with the connection end of the fourth LED lamp DL4 and the second button module, one end of the twelfth resistor R12, and one end of the first capacitor C1 in turn; the positive electrode of the fourth LED lamp DL4 is connected with one end of the fourteenth resistor R14; the other end of the second capacitor C2 is connected with the connection end of the fourth LED lamp DL4 and the fourteenth resistor R14; the other end of the twelfth resistor R12 is connected with the connection end of the fourth LED lamp DL4 and the fourteenth resistor R14, one end of the tenth resistor R10 in turn; one end of the eighth resistor R8 is connected with the other end of the tenth resistor R10, the other end of the fourteenth resistor R14, one end of the ninth resistor R9 in the second driving module in turn; the other end of the eighth resistor R8 is connected with the other end of the first capacitor C1, and then connected to the BCM controller.

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