Along with modern automobile electron and automobile industry development, automobile intellectualized degree more and more high, and so on each control system intellectualized request more and more is also high to the vehicles light control. The new control function but unceasingly increases along with the market need, like central door lock, glass fluctuation, rear view mirror adjustment, roof louvre window control, chair adjustment, ignition timing control and so on. Traditional black-white control wiring complex, creates the electronmagetic interference is serious, causes the system the reliable drop, simultaneously also gives the assembly and the maintenance brings many questions. Without a doubt, the use intelligence power component replaces traditional the relay and the fuse will certainly is ultimately. This experiment used England to fly insults the company intelligent power component BTS6143D. BTS6143D is England flies insults the intelligent high 边功 rate switch which the company develops, specially for satisfies the automobile electronic component harsh working conditions and the movement request designs.

This article will unify intelligent power component BTS6143D, [ in the 1> start characteristic and will short-circuit the protection characteristic to it in the intelligent light control system to conduct the research and the analysis. The article first simply introduces intelligent power component BTS6143D the basic structure, including internal function diagram and in light control system circuit diagram and so on; Afterwards introduces short-circuit test the step; Finally through the analytical investigation result, proved appears when the automobile light control system short-circuits the breakdown, BTS6143D can provide the traditional relay and a fuse is more rapid than effective protection.


1.BTS6143D synopsis

BTS6143D is England flies insults the corporate design N the trench FET power tube, the interior integrates the sufficient electric pump, the electric current actuation, and has the load current examination the breakdown feedback function (including overload, temperately has short-circuited examination and so on), is section integrates on®the SIPMOS piece the technical high side intelligent power switch chip.

BTS6143D is suitable for the automobile electron harsh working conditions, its work temperature range may from -40°C to +150°C. Uses 12V or the 24V load control, is suitable to each kind of anti- load, the perceptual load or the accommodating load, especially is suitable to has the high surge current the load, like lamp and so on; May as the relay, the fuse and establishes separately control method the and so on the electric circuit substitution method. In addition, BTS6143D also has many protections function: Short-circuits the protection, the over-load protection, 过压保护, warm has shut off, falls and falls the electricity protection, the static discharge protection and the power source ties hands behind the back the protection and so on.

The BTS6143D internal function diagram chart 1 shows:

Base pin disposition and functional description:

The base pin 1 and the base pin 5 outputs the pin exterior, these two base pins need 短接;

The base pin 2 inputs the base pin, for chip control holding wire;

The base pin 3 is the supply voltage input base pin, for entire chip power supply;

The base pin 4 is the breakdown diagnosis pin, the base pin 4 output currents and the load current has the direct ratio under the chip normal work condition.

2.BTS6143D in intelligent light control system application

The existing vehicles light control uses the relay drive type. Below but, the relay drive type has the shortcoming:

* Power relay exciting coil actuation electric current bigger, must consume compares the high efficiency also the connection electric circuit is complex;

* The relay use causes the controller volume to increase, weight increase;

* Relay switch frequency relative lower, the electronic contact is easy to vibrate, is very difficult to satisfy the vehicles to go in the charged situation to the mechanical vibrations request. In addition the electronic contact vibration can affect the relay the life, also EMI is serious;

* Effectively realizes with difficulty to the headlight has been hot, has pressed, short-circuits and so on the breakdown diagnosis and the protection;

* Must coordinate the fuse use, has prevented the class. But the fuse once the movement (namely fuse), the electric circuit thoroughly will shut off, needs the manual replacement fuse.
Along with the automobile industry development, the more and more many intelligent chip substitution relay and the fuse use in the vehicles light control system. Because uses power component itself has the consummation the protection function (过压保护, has flowed protection, over-load protection, short-circuits protection, warm has shut off, leads the way examination and so on), thus has omitted the fuse and some discrete component, reduced the controller volume; Simultaneously may realize the breakdown diagnosis function, not only may know was which component appeared the breakdown, moreover was allowed to know was any reason has caused such mistake, thus was more advantageous to the service.

BTS6143D shows in light control system application electric circuit like chart 2:

3. Testing sequence

3.1 test conditions

Accumulator cell open-circuit voltage 12.41V; The load connecting lead is long approximately is 1.5m (resistance R=0.12ohm, inductance L=3 mu H). The wire plan area is 0.75 mm² . Connects the 55W headlight. The measurement equipment is the Lecroy oscilloscope. Experiment ambient temperature approximately 20 �?

3.2 experimental circuit diagrams

In order to be advantageous for the comparison, has arranged two groups of short-circuit tests, like chart 3 shows, (a) the chart is the BTS6143D actuation headlight experiment electric circuit schematic drawing, (b) the chart actuates the headlight connection schematic drawing for the relay.