CN216930369U

CN216930369U - Fault linkage circuit of automobile signal lamp function

Info

Publication number: CN216930369U
Application number: CN202220241556.XU
Authority: CN
Inventors: 冯振生
Original assignee: Shanghai Xichen Technology Co ltd
Current assignee: Shanghai Xichen Technology Co ltd
Priority date: 2022-01-29
Filing date: 2022-01-29
Publication date: 2022-07-08
Anticipated expiration: 2032-01-29

Abstract

The utility model discloses a fault linkage circuit for functions of an automobile signal lamp, which comprises a first fault linkage circuit for detecting the state of a lamp A, a second fault linkage circuit for detecting the state of a lamp B and a fault linkage line connected between the first fault linkage circuit and the second fault linkage circuit. The utility model belongs to the technical field of a car lamp fault checking circuit, and particularly provides a fault linkage circuit which adopts a simple hardware circuit, utilizes a feedback signal of a driving chip after a fault to perform a direct fault linkage function of different functional blocks of a lamp and the same lamp, has faster response, achieves the effect of switching the lamps with faults, and is convenient to use.

Description

Fault linkage circuit of automobile signal lamp function

Technical Field

The utility model belongs to the technical field of a car lamp fault checking circuit, and particularly relates to a fault linkage circuit for the function of an automobile signal lamp.

Background

In automobile headlights, split headlamps are more popular, in some models, lamps with the same function, such as LED daytime running lamps, turn lamps and the like, are often distributed in different lamp bodies, one of the two lamps usually breaks down due to the requirement of regulations on optics, the brightness of the single lamp cannot meet the requirement of the regulations, and the other lamp needs to be subjected to fault shutoff treatment, commonly called as a fault linkage function.

In the prior art, a driving scheme of a single chip microcomputer is adopted in two headlamps, a fault linkage line is utilized, the single chip microcomputer judges whether a lamp has a fault or not through sampling of the fault linkage line, and the single chip microcomputer is required to be arranged in each lamp driver, so that the cost of the single chip microcomputer is increased through the reutilization of the single chip microcomputer.

SUMMERY OF THE UTILITY MODEL

Aiming at the situation, in order to overcome the defects of the prior art, the utility model provides a circuit for fault linkage of the functions of the automobile signal lamp, which adopts a simple hardware circuit, utilizes the feedback signal of the driving chip after the fault to perform the direct fault linkage function of the lamp and different functional blocks of the same lamp, has faster response, achieves the effect of mutual correlation of the lamps with the fault, and is convenient to use.

The technical scheme adopted by the utility model is as follows: the utility model relates to a fault linkage circuit for functions of an automobile signal lamp, which comprises a first fault linkage circuit for detecting the state of a lamp A, a second fault linkage circuit for detecting the state of a lamp B and a fault linkage line connected between the first fault linkage circuit and the second fault linkage circuit.

Preferably, the first fault linkage circuit comprises a first driving chip, a first driving circuit, a first resistor R1, a second resistor R2, a third resistor R3, a low-side switch Q1, a triode Q3, a first voltage regulator diode D1, a second voltage regulator diode D2,

the first driving chip is connected with the first driving circuit, the first driving chip and the first driving circuit are respectively grounded, a power supply 1 is input to one side of the first driving chip and the first driving circuit, the e pole of the triode Q3 is grounded, the c pole of the triode Q3 is connected with a third resistor R3 and is connected to the b pole of the low-side switch Q1, the b pole of the triode Q3 is connected with a second resistor R2, a first voltage-stabilizing diode D1 and a second voltage-stabilizing diode D2 in series to be connected to the first driving circuit, the e pole of the low-side switch Q1 is grounded, the c pole of the low-side switch Q1 is connected to an LED light source and is connected to the driving circuit, the first resistor R1 is connected with the input power supply 1 and is connected to the c pole of the triode Q3,

the cathode of the first zener diode D1 is connected to the anode of the second zener diode D2, the second resistor R2 is connected to the anode of the first zener diode D1, and the anode of the LED light source is connected to the cathode of the second zener diode D2.

And the second fault linkage circuit comprises a second driving chip, a second driving circuit, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a low-side switch Q2, a triode Q4, a third voltage-regulator diode D3 and a fourth voltage-regulator diode D4, in the scheme, the first fault linkage circuit and the second fault linkage circuit have the same structure and function, the second fault linkage circuit refers to the first fault linkage circuit, a power supply 2 is input through one side of the second driving chip and the second driving circuit, and two ends of a fault linkage line are respectively connected and arranged on one side of the c pole of the third resistor R3 close to the triode Q3 and one side of the c pole of the sixth resistor R6 close to the triode Q4.

In this embodiment, the low-side switch Q1 and the low-side switch Q2 may be NPN transistors or N MOSFETs.

The utility model with the structure has the following beneficial effects: according to the circuit for fault linkage of the automobile signal lamp function, a feedback signal which is carried out after a fault by a driving chip is utilized to carry out a direct fault linkage function of different function blocks of a lamp and the same lamp, and the fault linkage is realized in a mode of controlling a low-side switch of an LED string; the pure hardware circuit is used for realizing the fault linkage function, the singlechip hardware of 2 related lamps can be saved, the cost is saved, the response is faster, and the effect of lamp correlation when faults occur is achieved.

Drawings

FIG. 1 is a schematic diagram of a fault-linked circuit for the automotive signal lamp function according to the present disclosure;

FIG. 2 is a schematic view of example 1;

FIG. 3 is a schematic view of example 2;

fig. 4 is a schematic diagram of the prior art.

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

As shown in fig. 1-4, the fault linkage circuit for the function of the automotive signal lamp comprises a first fault linkage circuit for detecting the state of a lamp a, a second fault linkage circuit for detecting the state of a lamp B, and a fault linkage line connected between the first fault linkage circuit and the second fault linkage circuit, wherein when the lamp a or the lamp B has a fault, the fault linkage function is realized by switching off the other lamp.

As shown in the figure, the signal lamp fault linkage circuit mainly comprises Q1 and Q2 low-side switches (which may be NPN-type triodes or N-type MOSFETs), R1, R2, R3, R4, R5, and R6 resistors, triodes Q3 and Q4, and a fault identification circuit.

V1 is the voltage at the junction of the fault linkage line and the first and second fault linkage circuits, V2 is the voltage between R2 and the first drive chip, and V3 is the voltage between R5 and the second drive chip.

When the two lamps work normally: q1(Q2) is driven by the pull-up power provided by the input power supply, and when V1 is at high level, lamp A and lamp B work normally.

When one lamp fails, the switch Q3 (or Q4) is set to be low level by setting the V2 (or V3) to be high level, and the Q2 and the Q1 are cut off to turn off the other lamp, so that the fault linkage function is realized.

In embodiment 1, when the LED fails, the driving chip (such as TPS92601 of TI) will normally set the voltage of LED + to a constant voltage value, and when the constant voltage value exceeds the voltage of the voltage regulator tubes D1 and D2, V2 will be high.

In embodiment 2, when the LED fails, V2 and V3 are set to high level by using the diagnosis inside the driver chip.

As shown in fig. 4, in order to adopt a driving scheme of a single chip microcomputer in both headlamps in the prior art, it can be seen from the circuit diagram of fig. 4 that a fault linkage line is used, and the single chip microcomputer determines whether a lamp has a fault or not by sampling the fault linkage line, and the defect is obvious, the single chip microcomputer is required to be arranged in each lamp driver, and the cost of the single chip microcomputer is increased due to the reuse of the single chip microcomputer.

In conclusion, the lamp-to-lamp and same lamp different function blocks are directly subjected to the fault linkage function by utilizing the feedback signal of the driving chip after the fault, and the fault linkage is realized by controlling the low-side switch of the LED string.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. The utility model provides a circuit of trouble linkage of car signal lamp function which characterized in that: the lamp linkage detection device comprises a first fault linkage circuit for detecting the state of a lamp A, a second fault linkage circuit for detecting the state of a lamp B and a fault linkage line connected between the first fault linkage circuit and the second fault linkage circuit, wherein when the lamp A or the lamp B breaks down, the other lamp is turned off to realize fault linkage.

2. A circuit for fault-linked functioning of a signal lamp of a motor vehicle according to claim 1, characterized in that: the first fault linkage circuit comprises a first driving chip, a first driving circuit, a first resistor R1, a second resistor R2, a third resistor R3, a low-side switch Q1, a triode Q3, a first voltage-stabilizing diode D1 and a second voltage-stabilizing diode D2, wherein the first driving chip is connected with the first driving circuit, the first driving chip and the first driving circuit are respectively grounded, a power supply 1 is input to one side of the first driving chip and the first driving circuit, the e pole of the triode Q3 is grounded, the c pole of the triode Q3 is connected with the third resistor R3 and connected to the b pole of the low-side switch Q1, the b pole of the triode Q3 is connected with the second resistor R2, the first voltage-stabilizing diode D1 and the second voltage-stabilizing diode D2 in series to the first driving circuit, the e pole of the low-side switch Q1 is grounded, the c pole of the low-side switch Q1 is connected with a light source, the first voltage-stabilizing diode R1 is connected with the input resistor R3 and connected with the c pole of the triode Q3, and the cathode of the first zener diode D1 is connected with the anode of the second zener diode D2, the second resistor R2 is connected with the anode of the first zener diode D1, and the anode of the LED light source is connected with the cathode of the second zener diode D2.

3. A circuit for fault-linked functioning of a signal lamp of a motor vehicle according to claim 2, characterized in that: the second trouble linkage circuit includes the second driver chip, the second driver circuit, fourth resistance R4, fifth resistance R5, sixth resistance R6, low-side switch Q2, triode Q4, third zener diode D3, fourth zener diode D4 constitutes, in this scheme, the structure of first trouble linkage circuit and second trouble linkage circuit, the function is the same completely, the structure is corresponding, through one side input power 2 of second driver chip and second driver circuit, the both ends of trouble linked line are connected respectively and are located the c utmost point one side that third resistance R3 is close to triode Q3, and the c utmost point one side that sixth resistance R6 is close to triode Q4.

4. A circuit for fault-linked functioning of a signal lamp of a motor vehicle according to claim 3, characterized in that: the low-side switch Q1 and the low-side switch Q2 are NPN type triodes or N type MOSFETs.