Dual-color lamp bead multiplexing channel LED driving circuit

Abstract

The utility model discloses a LED drive circuit of two -color lamp pearl multiplexing channel, including LED drive module, two -color lamp pearl LED1 LEDn, resistance R1, R2, R3, R4, N channel field effect transistor Q1, Q2, MCU, CAN communication, UART communication, power VLED, power VCC, this LED drive circuit design is simple, possesses the function that channel multiplexing and two -color lamp pearl independent point the light, has reduced the quantity required LED drive significantly, thereby has realized the effective reduction of cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of automobile lamp driving circuit, specifically a lamp pearl LED drive circuit. BACKGROUND

[0002] With the vigorous development of domestic new energy automobile industry and the increasing demand of consumers for automobile intelligentization and individualization, automobile lighting system is undergoing unprecedented changes. Traditional single-color lamp beads have been difficult to meet the diversified needs of modern automobile lighting system due to their single function and lack of innovation. Especially in some specific application scenarios, such as front lamp with steering and daytime running function multiplexing, in-vehicle atmosphere lamp, etc., the design concept of one lamp with double or even multiple colors and one lamp with multiple functions has gradually become the mainstream trend of the market.

[0003] As a product under this trend, double-color LED lamp beads realize significant improvement of lighting effect and diversification of function by integrating two different color LEDs in one package. By precisely controlling the current through different LED light emitters, double-color LED lamp beads can flexibly output single color or mixed color light, thus meeting different lighting needs.

[0004] However, the application of double-color LED lamp beads also brings certain challenges, the most notable of which is the problem of driving cost. Since double-color LED lamp beads actually contain two independent lamp beads, two channels are needed to drive them respectively to realize independent light control. This undoubtedly increases the number and complexity of LED driving, thus leading to the rise of cost. SUMMARY

[0005] In order to overcome the above-mentioned problem of using two channels to drive double-color LED lamp beads and increasing driving cost, the utility model provides a double-color lamp bead multiplexing channel LED drive circuit, which greatly reduces the cost of driving components.

[0006] The technical scheme adopted by the utility model is:

[0007] The utility model provides a kind of LED drive circuit of double-color lamp bead multiplex channel, including LED drive module, n double-color lamp beads LED1-LEDn, resistance R1, resistance R2, resistance R3, resistance R4, N channel field effect transistor Q1, N channel field effect transistor Q2, MCU, CAN communication, UART communication, power supply VLED, power supply VCC;Power supply VLED is connected with the VLED of LED drive module, the anode of each double-color lamp bead is connected together and is connected with the output channel CH of LED drive module, one of the cathode of each double-color lamp bead is connected with the drain of N channel field effect transistor Q1, the cathode of another double-color lamp bead is connected with the drain of N channel field effect transistor Q2, the source of N channel field effect transistor Q1 is grounded, the gate of N channel field effect transistor Q1 is connected with resistance R1, resistance R2 one end respectively, the other end of resistance R1 is connected with MCU, the other end of resistance R2 is connected with ground, the source of N channel field effect transistor Q2 is grounded, the gate of N channel field effect transistor Q2 is connected with resistance R3, resistance R4 one end respectively, the other end of resistance R3 is connected with MCU, the other end of resistance R4 is connected with ground, power supply VCC is connected with the VCC of MCU.

[0008] Compared with prior art, the LED drive circuit of the utility model has simple design, has the functions of channel multiplexing and double-color lamp bead independent lighting, significantly reduces the number of required LED drive, thereby realizing effective reduction of cost. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is the utility model drive circuit schematic diagram. DETAILED DESCRIPTION

[0010] In order to make the purpose, technical scheme and advantage of the utility model more clear and obvious, the utility model is further detailed below with the drawings and examples.

[0011] See Figure 1The application discloses a LED driving circuit of a double-color lamp bead multiplexing channel, which comprises an LED driving module, n double-color lamp beads LED1-LEDn, resistors R1, R2, R3 and R4, N-channel field effect tubes Q1 and Q2, an MCU, CAN communication, UART communication, a power supply VLED and a power supply VCC; the power supply VLED is connected with VLED of the LED driving module, anodes of each double-color lamp bead are connected together and connected with an output channel CH of the LED driving module, a cathode of one of each double-color lamp bead is connected with a drain of the N-channel field effect tube Q1, a cathode of the other of each double-color lamp bead is connected with a drain of the N-channel field effect tube Q2, a source of the N-channel field effect tube Q1 is grounded, a gate of the N-channel field effect tube Q1 is connected with one end of the resistor R1 and one end of the resistor R2 respectively, the other end of the resistor R1 is connected with the MCU, the other end of the resistor R2 is connected with the ground, a source of the N-channel field effect tube Q2 is grounded, a gate of the N-channel field effect tube Q2 is connected with one end of the resistor R3 and one end of the resistor R4 respectively, the other end of the resistor R3 is connected with the MCU, the other end of the resistor R4 is connected with the ground, and the power supply VCC is connected with VCC of the MCU.

[0012] In specific work, the power supply VLED supplies power for the LED driving module, and the power supply VCC supplies power for the MCU. The LED driving module receives the electric energy of the power supply VLED, and converts the electric energy into stable direct current through an internal driver. When the MCU receives external instructions through CAN communication, it informs the LED driving module of the channel (connecting the anode of the double-color lamp bead) to be opened and the corresponding current size through UART communication according to preset program logic, and sends corresponding control signals to Q1 and Q2 (connecting the cathode of the double-color lamp bead) to change the switch state. Figure 1 When the MCU outputs a high level to control Q1 to open, Q1 is turned on, the drain is grounded, Figure 1 When the MCU outputs a low level to control Q2 to close, the drain of Q2 is not conductive with the ground, even if the LED driving module provides current, the black lamp bead in the TI_CH line will not be lit. Thus, one driving channel is multiplexed to realize independent lighting function.

[0013] The above merely describes general implementation manners of the present application, and the present application can have various other implementation manners with modifications and changes for those skilled in the art, which are not described one by one here. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application is included in the protection scope required by the present application.

Claims

1. An LED driving circuit with a dual-color LED multiplexing channel, characterized in that, The system includes an LED driver module, n bi-color LEDs (LED1-LEDn), resistors R1, R2, R3, and R4, N-channel MOSFETs Q1 and Q2, an MCU, CAN communication, UART communication, a power supply VLED, and a power supply VCC. The power supply VLED is connected to the VLED of the LED driver module. The anodes of each bi-color LED are connected together and connected to one output channel CH of the LED driver module. One cathode of each bi-color LED is connected to the drain of the N-channel MOSFET Q1. The cathode of another LED is connected to the drain of N-channel MOSFET Q2. The source of N-channel MOSFET Q1 is grounded. The gate of N-channel MOSFET Q1 is connected to one end of resistors R1 and R2 respectively. The other end of resistor R1 is connected to the MCU. The other end of resistor R2 is connected to ground. The source of N-channel MOSFET Q2 is grounded. The gate of N-channel MOSFET Q2 is connected to one end of resistors R3 and R4 respectively. The other end of resistor R3 is connected to the MCU. The other end of resistor R4 is connected to ground. The power supply VCC is connected to the VCC of the MCU.

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