CN207678034U

CN207678034U - Based on TLD2314EL dynamic steering circuits

Info

Publication number: CN207678034U
Application number: CN201721193456.XU
Authority: CN
Inventors: 曹钰品; 徐宝奇; 任康成; 董伟
Original assignee: Changzhou Xingyu Automotive Lighting Systems Co Ltd
Current assignee: Changzhou Xingyu Automotive Lighting Systems Co Ltd
Priority date: 2017-09-18
Filing date: 2017-09-18
Publication date: 2018-07-31
Anticipated expiration: 2027-09-18

Abstract

The utility model discloses one kind being based on TLD2314EL dynamic steering circuits, the corresponding input IN SET feet of TLD2314EL pass sequentially through the signal pins connection corresponding with MCU of resistance and switching transistor respectively, the low and high level exported by the signal pins of MCU, triggering input each switching transistor of IN SET feet successively, every group of lamp string common cathode connection of the LED light string group, the OUT feet connection corresponding with TLD2314EL respectively of its anode, goes out by the way that the lamp of the corresponding lamp string of switching transistor control is bright with lamp；The diagnostic circuit can detect out of order unit, all LED be turned off, and be supplied to BCM, and car owner's car light is reminded to break down.The utility model is stablized with flash frequency, constant current output, and current precision is high, and dynamic response is fast, and ripple is small, low noise and the detection of LED open circuits and defencive function.

Description

Based on TLD2314EL dynamic steering circuits

Technical field

The utility model is related to vehicle signal lamp drive circuits, and in particular to one kind is based on TLD2314EL dynamic steering electricity Road belongs to technical field of automobile illumination.

Background technology

Along with China's economy, the development of improvement of living standard and auto industry technology, to vehicle safety performance requirement It is higher and higher, the normal work of automobile signal light, it is ensured that driver can provide the good of train signal and night running in time Good field range, a automobile belt LED dynamic steering constant currents driving are currently the hot spot of automotive illumination applications.

Automobile electronics design requirement is stringenter, especially on the lamps and lanterns of security critical performance.Based on normal at present The non-constant-current drive circuit of resistance-type, before the stable constant-current LED driving of an output is entire automobile LED lighting system It carries.

Utility model content

For the shortcoming in background technology, the utility model aim is to drive output characteristics to take feel in LED according to LED Characteristic and driving chip, provide it is a kind of being based on TLD2314EL dynamic steering circuits, stablize with flash frequency, constant current is defeated Go out, current precision is high, and dynamic response is fast, and ripple is small, and low noise and the detection of LED open circuits and defencive function meet automotive electronics The requirement of application environment.

To achieve the goals above, the utility model is to realize by the following technical solutions：

One kind being based on TLD2314EL dynamic steering circuits comprising TLD2314EL integrated circuits, MCU, BCM, LED light string Group and diagnostic circuit, the corresponding IN-SET feet of the TLD2314EL pass sequentially through resistance respectively and switching transistor is corresponding with MCU Signal pins connect, and the low and high level exported by the signal pins of MCU triggers each switching transistor of IN-SET feet, the LED successively Every group of lamp string common cathode connection of lamp string group, anode OUT feet connection corresponding with TLD2314EL respectively, passes through switching transistor The lamp of the corresponding lamp string of control is bright and lamp goes out；The diagnostic circuit includes mainly open circuit detection comparator, input terminal and LED light string Common cathode connects, and output end is connect with automobile BCM systems, when automobile lamp can not carry out normal signal prompt, to vehicle System provides detection, and all LED are turned off, while informing that car owner's car light breaks down.

As the further preferred scheme of the utility model, the LED light string group is gone here and there for 1-3.

As the utility model still more preferably scheme, the LED light string group is 3 strings.

As the further preferred scheme of the utility model, the MCU models PIC16F1824.

The TLD2314EL is three channels high-pressure side driving constant current integrated circuit, and there is independent load electricity in three channels Stream adjustment function, individual devices can drive 3 lamp strings, can accomplish 120mA per channel current maximum, be generated by MCU Low and high level allows the signal of TLD2314EL to trigger the dynamic response time for enabling pin control LED.

Compared with the existing technology, the beneficial effects of the utility model are as follows：

The utility model uses TLD2314EL constant current integrated circuits, it is ensured that constant current output, dynamic is corresponding fast, while this reality There is the detection of LED open circuits and defencive function with novel.

Description of the drawings

Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other spies of the utility model Sign, objects and advantages will become more apparent upon：

Fig. 1 is dynamic circuit block diagram of the utility model using 3 string LED；

Fig. 2 is the utility model TLD2314EL circuit connection diagrams.

Fig. 3 is that the utility model MCU power inputs protect circuit connection diagram.

Fig. 4 is that the utility model is supplied to MCU operating voltage 5V source of stable pressure circuit diagrams

Fig. 5 is the utility model MCU PIC16F1824 circuit connection diagrams.

Fig. 6 is the utility model low and high level trigger circuit.

Specific implementation mode

To make the technical means, creative features, achievement of purpose, and effectiveness of the utility model be easy to understand, below In conjunction with specific implementation mode, the utility model is expanded on further.

It please refers to Fig.1 to Fig. 6,

In the application of steering indicating light multi-string LED, the TLD2314EL feet of corresponding IN-SET1 ~ 3, which connect a resistance, to be distinguished Output current is adjusted, the low and high level exported by the signal pins of MCU PIC16F1824, trigger switch triode TQ1 successively, TQ3, TQ5 are switched, and when low level, triode cut-off, lamp string is in and works in the state of being always on.When high level, triode ON, By the threshold voltage of setting, corresponding IN-SET feet are turned off, wherein a string of LED light are gone out, according to the response cycle set in MCU Successively 1/0, to realize the effect of dynamic steering, another this device LED light string common cathode connection, so with low-side current sensing System will only need a single return conductor, and have a return conductor without each LED light string.When a LED therein Damage, open circuit detection comparator can detect out of order unit, all LED turned off, and be supplied to BCM, remind car owner's vehicle Lamp breaks down.

The advantages of basic principles and main features and the utility model of the utility model have been shown and described above, for For those skilled in the art, it is clear that the present invention is not limited to the details of the above exemplary embodiments, and without departing substantially from this In the case of the spirit or essential attributes of utility model, the utility model can be realized in other specific forms.Therefore, no matter From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the utility model is by institute Attached claim rather than above description limit, it is intended that will fall within the meaning and scope of the equivalent requirements of the claims All changes are embraced therein.Any reference numeral in claim should not be considered as to the involved right of limitation It is required that.

Claims

1. being based on TLD2314EL dynamic steering circuits, it is characterised in that：Including TLD2314EL integrated circuits, MCU, BCM, LED Lamp string group and diagnostic circuit, the corresponding IN-SET feet of the TLD2314EL integrated circuits pass sequentially through resistance and switch three respectively Pole pipe signal pins connection corresponding with MCU, the low and high level exported by the signal pins of MCU trigger IN-SET feet and respectively switch successively Triode, every group of lamp string common cathode connection of the LED light string group, anode OUT feet connection corresponding with TLD2314EL respectively, It goes out with lamp by the way that the lamp of the corresponding lamp string of switching transistor control is bright；The diagnostic circuit includes mainly open circuit detection comparator, Input terminal is connect with LED light string common cathode, and output end is connect with automobile BCM systems, can not normally be believed in automobile lamp When number prompt, detection is provided to Full Vehicle System, and all LED is turned off, while informing that car owner's car light breaks down.

2. circuit as described in claim 1, it is characterised in that：The LED light string group is gone here and there for 1-3.

3. circuit as claimed in claim 2, it is characterised in that：The LED light string group is 3 strings.

4. circuit as described in claim 1, it is characterised in that：The model PIC16F1824 of the MCU.