CN108575011A - A LED car light controller - Google Patents

Abstract

The present invention relates to car light control technology fields, more particularly to a kind of LED car lamp controller, including LED drive unit, control unit, LED control circuit, temperature feedback unit and LED module, LED drive unit is connected with control unit by spi bus, LED drive unit is for driving LED module, for temperature feedback unit by the temperature feedback of the LED module detected to LED drive unit, control unit controls LED module by LED control circuit.Present invention control is flexible, there is more eye-catching prompting effect, simple in structure to improve the safety of driving, at low cost, prevents car light from overheating by temperature feedback unit, effectively extends the service life of car light.

Description

A LED car light controller

technical field

The invention relates to the technical field of vehicle light control, in particular to an LED vehicle light controller.

Background technique

With the continuous advancement of LED light source technology, there are more and more cases of using LEDs as automotive light sources in automobiles. There are corresponding products from low-power turn signals and lighting lights to high-power fog lights and headlights. Moreover, with the increasing development of the automobile industry, the significance of the existence of car lights is not just lighting. People's increasing requirements for car lights are the diversification and dynamics of car lights.

At present, traditional car lights are more of a string of lights, which cannot be controlled individually, and the lighting time and brightness cannot be controlled. A single light is likely to cause visual fatigue to passers-by, and it does not have much indication and reminder for avoiding accidents.

Publication number is the controller that proposes a kind of car light sequence light-off in CN205356731U patent case. But this scheme has obvious deficiencies. The disadvantage of this solution is that its circuit is a parallel circuit, and the total current of the parallel circuit will be relatively large. Moreover, under the parallel circuit, the LED current of each channel is limited, thereby limiting the lumen value of the LED; the shortcoming of this solution is that when the vehicle voltage fluctuates between 9V-16V, the current value of the resistive circuit will be relatively large Fluctuation; the disadvantage of this solution is that the resistive circuit will have a large temperature drift, and the circuit has no thermistor feedback circuit.

Contents of the invention

The invention provides an LED car light controller with simple structure and flexible control mode.

In order to achieve the purpose of the present invention, the adopted technical solution is: a LED car light controller, including an LED drive unit, a control unit, an LED control circuit, a temperature feedback unit and an LED module, and the LED drive unit and the control unit pass SPI The bus is connected, the LED driving unit is used to drive the LED module, the temperature feedback unit feeds back the detected temperature of the LED module to the LED driving unit, and the control unit controls the LED module through the LED control circuit.

As an optimized solution of the present invention, the LED drive unit is an LED drive chip, the control unit is an MCU chip, the LED control circuit is a MOS tube, the temperature feedback unit is a thermistor NTC, and the LED module includes multiple LEDs connected in series.

As an optimized solution of the present invention, a single IO pin of the MCU chip is connected to the gate of a single MOS transistor, and the drain of the MOS transistor is connected to the anode of a single LED.

As an optimized solution of the present invention, the MCU chip controls the MOS tube by generating a PWM signal to adjust the brightness of the LED.

As an optimized solution of the present invention, the MCU chip controls the on-off of the LED by controlling the on-off of the MOS tube.

As an optimized solution of the present invention, the MCU chip controls the switching time of the LED through its own timer.

As an optimized solution of the present invention, the thermistor NTC adjusts the output current of the LED driver chip by detecting the temperature of the LED module.

As an optimized solution of the present invention, the power supply provides power supply to the control unit through the LDO regulator.

The present invention has positive effects: 1) The present invention can make each LED of the car lamp be controlled individually, and can control the brightness of the LED, so that the car lamp has a certain eye-catching effect; the present invention has the function of sequentially controlling the The function of turning on and off the lights can be turned on one by one, and can also be turned off one by one, so that the car lights have a certain indicating effect; the present invention has the function of freely controlling the dynamic cycle of LED lights, for example, in different There are different dynamic cycles at different vehicle speeds, and there will be a more eye-catching reminder effect to improve driving safety;

2) The present invention has simple structure and low cost, and the temperature feedback unit prevents the lamp from overheating, effectively prolonging the service life of the lamp.

Description of drawings

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a block diagram of the present invention;

Fig. 2 is a schematic circuit diagram of the present invention.

Among them: 1. LED drive unit, 2. Control unit, 3. LED control circuit, 4. Temperature feedback unit, 5. LED module.

Detailed ways

As shown in Fig. 1-2, the present invention discloses a LED car lamp controller, including an LED drive unit 1, a control unit 2, an LED control circuit 3, a temperature feedback unit 4 and an LED module 5, and the LED drive unit 1 and The control unit 2 is connected through the SPI bus, the LED drive unit 1 is used to drive the LED module 5, the temperature feedback unit 4 feeds back the detected temperature of the LED module 5 to the LED drive unit 1, and the control unit 2 is controlled by the LED control circuit 3 LED module5. The LED drive unit 1 and the control unit 2 are connected through the SPI bus, which ensures the synchronization of signal transmission.

The LED drive unit 1 is an LED drive chip, the control unit 2 is an MCU chip, the LED control circuit 3 is a MOS tube, the temperature feedback unit 4 is a thermistor NTC, and the LED module 5 includes multiple LEDs connected in series. Among them, the LED driving chip is a constant current driving chip. In Figure 2, LED Driver is the LED driver chip, MCU is the MCU chip, and MOSFET-N is the MOS tube.

A single IO pin of the MCU chip is connected to the gate of a single MOS transistor, and the drain of the MOS transistor is connected to the anode of a single LED.

The MCU chip generates a PWM signal to control the MOS tube to adjust the brightness of the LED. The PWM signal is transmitted to the gate of the MOS tube to adjust the brightness of the LED.

The MCU chip controls the on and off of the LED by controlling the on-off of the MOS tube. According to a certain logic, multiple LEDs can be turned on and off in sequence.

The MCU chip controls the switching time of the LED through its own timer. In order to complete the control of the dynamic cycle of the LED.

The thermistor NTC adjusts the output current of the LED driver chip by detecting the temperature of the LED module 5 . By adjusting the output current of the LED driver chip, overheating is prevented and the LED module 5 is protected.

The power supply provides power supply to the control unit 2 through the LDO regulator. In Figure 2, LDO is an LDO voltage regulator.

The power supply provides the control unit 2 with a power supply voltage through the LDO regulator. The present invention provides a car light control method that controls dynamic time and dynamic brightness. By lighting up a single LED in sequence, the lighting sequence of the LEDs in the car light can be controlled. For example, the car lights are turned on and off sequentially in a certain time period , from bright to off can be used to indicate the direction in which the car is about to travel, and this time period can be flexibly adjusted within the allowable range of regulations, thereby producing an eye-catching effect that prevents pedestrians or vehicles on the road from producing visual Fatigue also indicates the driving direction of the car, which is convenient for pedestrians or passing vehicles to make early predictions. The LEDs in the lights can be turned on one by one, or turned off one by one.

The car light controller controls the gate of the MOS tube through the MCU chip, and then completes the control of each LED individually; the brightness of the LED can be freely controlled; the on and off of the LED can be controlled sequentially; the dynamic cycle of the LED lighting can be controlled .

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (8)

1. a kind of LED car lamp controller, it is characterised in that：Including LED drive unit (1), control unit (2), LED control circuit (3), temperature feedback unit (4) and LED module (5), the LED drive unit (1) and control unit (2) pass through spi bus It is connected, the LED drive unit (1) is for driving LED module (5), and the temperature feedback unit (4) is by what is detected The temperature feedback of LED module (5) gives LED drive unit (1), the control unit (2) to be controlled by LED control circuit (3) LED module (5).

2. a kind of LED car lamp controller according to claim 1, it is characterised in that：The LED drive unit (1) is LED drive chip, the control unit (2) are MCU chip, and the LED control circuit (3) is metal-oxide-semiconductor, the temperature Feedback unit (4) is thermistor NTC, and the LED module (5) includes more concatenated LED.

3. a kind of LED car lamp controller according to claim 2, it is characterised in that：The single I/O pin and list of MCU chip The grid of a metal-oxide-semiconductor is connected, and the drain electrode of metal-oxide-semiconductor is connected with the anode of single LED.

4. a kind of LED car lamp controller according to claim 3, it is characterised in that：MCU chip is by generating pwm signal Metal-oxide-semiconductor is controlled to adjust the brightness of LED.

5. a kind of LED car lamp controller according to claim 3, it is characterised in that：MCU chip is by controlling metal-oxide-semiconductor Turn-on deadline controls the light on and off of LED.

6. a kind of LED car lamp controller according to claim 3, it is characterised in that：The timer that MCU chip passes through itself To control the switch time of LED.

7. a kind of LED car lamp controller according to claim 3, it is characterised in that：Thermistor NTC is by detecting LED The temperature of module (5) adjusts the output current of LED drive chip.

8. a kind of LED car lamp controller according to claim 1, it is characterised in that：Power supply is by LDO voltage stabilizer Control unit (2) provides power supply.