CN203136298U

CN203136298U - PWM control module of LED stop lamps with fault diagnosis function

Info

Publication number: CN203136298U
Application number: CN 201320002801
Authority: CN
Inventors: 李志刚; 马文峰; 王晓光
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2013-01-05
Filing date: 2013-01-05
Publication date: 2013-08-14
Anticipated expiration: 2023-01-05

Abstract

The utility model relates to a PWM control module of LED stop lamps with a fault diagnosis function. The PWM control module of the LED stop lamps with the fault diagnosis function is characterized in that a current driving module forms constant current driving via two LM317 chips U1 and U2, and an LED matrix is composed of LED1 to LED 18, wherein the LED1 to LED 15 are formed into a matrix having three series circuits and five parallel circuits, and the LED16 to LED 18 are connected in series directly; after peripheral resistors, capacitors and diodes are added in a 555 chip U3 in a brightness grading module, a pin 3 of the 555 chip generates a 200 Hz and 10% PWM square wave, and the PWM square wave passes a diode D9 and then is branched voltage by resistors R12/R13 to drive a triode BCX54Q1 to be opened and closed. The PWM control module of the LED stop lamps with the fault diagnosis function is based on a PWM control mode, enables the stop lamps and the position lamps to share a set of brightness grading needed by a light source, prevents the brightness of a stop lamp LED light source from being affected by an external voltage via the LED specialized constant current driving chips, and has the over-temperature protection, short circuit protection and load open circuit detection functions. When the stop lamp LED light source loses efficacy, the control module of the stop lamps provides a signal feedback to a BCM, and finally prompts a driver via an indicating lamp on a combined instrument.

Description

The LED Brake lamp PWM control module that has fault diagnosis functions

Technical field

The utility model relates to a kind of LED Brake lamp PWM control module that has fault diagnosis functions, belongs to a kind of automobile LED Brake lamp module.

Background technology

At present, the vehicle rear taillight on the market or be bulb form, or be the LED form, but all do not have fault diagnosis functions.And the frequency that Brake lamp breaks down is higher, and the driver is difficult for again finding, has influenced traffic safety; Along with the requirement upgrading of user to safety system, the Brake lamp that has fault diagnosis functions will more and more be subjected to user's welcome.

Summary of the invention

The purpose of this utility model is to provide a kind of LED Brake lamp PWM control module that has fault diagnosis functions, it has adopted the control mode of PWM, realized that Brake lamp and position lamp share one group of required brightness classification of light source, drive chip by the LED special constant-current and guarantee that the brightness of Brake lamp led light source is not subjected to the influence of external voltage, and have overheat protector, short-circuit protection, load open circuit detection function; When the Brake lamp led light source lost efficacy, the Brake lamp control module can provide signal feedback to BCM, finally reminded the driver by the indicator light on the combination instrument.

The technical solution of the utility model is achieved in that the LED Brake lamp PWM control module that has fault diagnosis functions, be made up of current drives module, LED matrix, brightness diversity module, fault feedback module, it is characterized in that: the current drives module is formed constant current by two LM317 chip U1, U2 and is driven; The LED matrix is formed three strings five by LED1-LED15, and also matrix, LED16-LED18 directly are composed in series, LED1-LED15 forms three strings five and matrix one end is connected with the LM317 chip U1 of current drives module, 555 chip U3 draw angle 3 and are connected in the other end and the brightness diversity module, series circuit one end of LED16-LED18 connects the LM317 chip U2 of current drives module, and the other end is connected with the angle 3 of drawing of 555 chip U3 in the brightness diversity module; 555 chip U3 in the brightness diversity module, thus add that 555 pin of chip 3 behind peripheral resistance, electric capacity and the diode produce 200Hz, 10% PWM square wave and drive triode BCX54 Q1 switch by resistance R 12/R13 dividing potential drop after through diode D9 and embody position lamp function; Be high level always through the signal of diode D10 during the Brake lamp function, BCX54 opens always; The fault feedback circuit is made up of key element triode Q3, Q4, and the diode D6 in the LED matrix is connected with resistance R 5, R6 with diode D14, and triode Q4 is connected with the BCM port through resistance R 4;

LED Brake lamp power end is in parallel through braking light switch and high-mount brake lamp, left back taillight LED control module, right back taillight LED control module feeder ear, braking light switch is connected with RCM module brake switch signal input part by holding wire, left back taillight LED control module, right back taillight LED control module signal output part are connected with BCM module by signal input, and the malfunction indicator lamp of combination instrument is connected with the signal output part of BCM module by the CAN bus.

Good effect of the present utility model is by LED Brake lamp fault detection method and CAN bussing technique information to be presented in the combination instrument, makes things convenient for the driver to understand the fault message of Brake lamp timely, reduces user's the danger of driving.

Description of drawings

Fig. 1 is LED rear taillight internal circuit schematic diagram.

Fig. 2 is LED rear taillight and BCM connection layout.

Embodiment

Below in conjunction with accompanying drawing the utility model is further described: as shown in Figure 1, 2, the LED Brake lamp PWM control module that has fault diagnosis functions, be made up of current drives module 1, LED matrix 2, brightness diversity module 3, fault feedback module 4, it is characterized in that: current drives module 1 is formed constant current by two LM317 chip U1, U2 and is driven; LED matrix 2 is formed three strings five by LED1-LED15, and also matrix, LED16-LED18 directly are composed in series, LED1-LED15 forms three strings five and matrix one end is connected with the LM317 chip U1 of current drives module 1,555 chip U3 draw angle 3 and are connected in the other end and the brightness diversity module 3, series circuit one end of LED16-LED18 connects the LM317 chip U2 of current drives module 1, and the other end is connected with the angle 3 of drawing of 555 chip U3 in the brightness diversity module 3; 555 chip U3 in the brightness diversity module 3, thus add that 555 pin of chip 3 behind peripheral resistance, electric capacity and the diode produce 200Hz, 10% PWM square wave and drive triode BCX54 Q1 switch by resistance R 12/R13 dividing potential drop after through diode D9 and embody position lamp function; Be high level always through the signal of diode D10 during the Brake lamp function, BCX54 opens always; Fault feedback circuit 4 is made up of key element triode Q3, Q4, and the diode D6 in the LED matrix 2 is connected with resistance R 5, R6 with diode D14, and triode Q4 is connected with the BCM port through resistance R 4;

As shown in Figure 1,555 chip U3 are the acp chip of this module in the brightness diversity module 3, thereby add that 555 pin of chip 3 behind peripheral resistance, electric capacity and the diode produce 200Hz, 10% PWM square wave and drive triode BCX54 Q1 switch by resistance R 12/R13 dividing potential drop after through diode D9 and embody position lamp function; Be high level always through the signal of diode D10 during the Brake lamp function, BCX54 opens always; Feedback fraction is made up of key element triode Q3, Q4, if the LED operate as normal then provides 6.3V voltage by diode D6 and diode D14 diode for resistance R 5, R6 in the module two, resistance R 6 is supplied with triode Q3 ground level voltage 0.38V left and right sides triode Q3 and is closed, then triode Q4 ground level voltage is about 3.24V, triode Q4 open feedback end by dividing potential drop 3.9V behind the pull-up resistor about; Then provide 12V voltage by diode D6 and diode D14 for resistance R 5, R6 if LED opens circuit in the module two, resistance R 6 is supplied with triode Q3 ground level voltage 0.73V left and right sides triode Q3 and is opened, then triode Q4 ground level voltage is about 0.2V, triode Q4 close feedback end by dividing potential drop 6.8V behind the pull-up resistor about, the BCM port detects Feedback end high voltage, reports to the police.

LED Brake lamp PWM control module has constant current driving and fault diagnosis functions, when stepping on brake pedal, if fault-free, the signal that the output of fault feedback circuit Feedback end drags down.If the fault of detecting, the signal that the output of fault feedback circuit Feedback end is drawn high.

As shown in Figure 2, BCM can receive the fault feedback signal from left side and right side LED rear taillight module, and when signal is high level, then BCM is judged as fault, issues combination instrument by the CAN bus then, lights malfunction indicator lamp with the prompting driver.

Claims

1. the LED Brake lamp PWM control module that has fault diagnosis functions, be made up of current drives module (1), LED matrix (2), brightness diversity module (3), fault feedback module (4), it is characterized in that: current drives module (1) is formed constant current by two LM317 chip U1, U2 and is driven; LED matrix (2) is formed three strings five by LED1-LED15, and also matrix, LED16-LED18 directly are composed in series, LED1-LED15 forms three strings five and matrix one end is connected with the LM317 chip U1 of current drives part (1), the other end is connected with 555 chip U3 pins 3 in the brightness diversity module (3), series circuit one end of LED16-LED18 connects the LM317 chip U2 of current drives module (1), and the other end is connected with the pin 3 of 555 chip U3 in the brightness diversity module (3); 555 chip U3 in the brightness diversity module (3), thus add that 555 pin of chip 3 behind peripheral resistance, electric capacity and the diode produce 200Hz, 10% PWM square wave and drive triode BCX54 Q1 switch by resistance R 12/R13 dividing potential drop after through diode D9 and embody position lamp function; Be high level always through the signal of diode D10 during the Brake lamp function, BCX54 opens always; Fault feedback module (4) is made up of key element triode Q3, Q4, and the diode D6 in the LED matrix (2) is connected with resistance R 5, R6 with diode D14, and triode Q4 is connected with the BCM port through resistance R 4; LED Brake lamp power end is in parallel through braking light switch and high-mount brake lamp, left back taillight LED control module, right back taillight LED control module feeder ear, braking light switch is connected with RCM module brake switch signal input part by holding wire, left back taillight LED control module, right back taillight LED control module signal output part are connected with BCM module by signal input, and the malfunction indicator lamp of combination instrument is connected with the signal output part of BCM module by the CAN bus.