In car controller more circuit protection of intelligence? Try EFuse
[introduction]In contemporary car and industrial application, dependability is crucial. From car section controller, wait for a product to the computerized numerical control in industrial application, no matter end item is simple,still be complex, if unwarrantable dependability, damage the reputation of manufacturer probably. In addition, still need to consider to guarantee the cost of maintenance, it is the cost of recall product even.
In contemporary car and industrial application, dependability is crucial. From car section controller, wait for a product to the computerized numerical control in industrial application, no matter end item is simple,still be complex, if unwarrantable dependability, damage the reputation of manufacturer probably. In addition, still need to consider to guarantee the cost of maintenance, it is the cost of recall product even.
However, electronic circuit after all can appear breakdown, as a result of,the likelihood is outside influence, because package follows time elapse to function drops and be caused,also may be. Accordingly, according to good design practice, the proposal uses circuit to protect parts of an apparatus, come in order to ensure the influence breakdown falls lowest.
The article introduced standard circuit to protect the limitation of parts of an apparatus, and how to use electronic fuse to improve a design.
The commonnest (and cost lowest) circuit protection form is common fuse. This kind of fuse is based on the tinsel with melting point inferior temperature or thin metal tape normally. Fuse is inserted normally in circuitry of power source power supply, when exceeding rated electric current, the quantity of heat of the generation in fuse can make tinsel / metal tape fusing, make circuit and power source disconnect thereby join.
This kind disconnects is not instantaneous normally, fuse ” fusing ” needs time and fault current size become inverse ratio. If electric current only rating of fuse of summary prep above, it may continue to pass period of time, affect power supply course thereby, cause circuit breakdown or damage.
The use of fuse is no-go; Once fuse fusing, change with respect to need (normally need is undertaken changing by the user) . If user (innocently or intended) the rating that used an error, can form fire venture.
To circuit protection, still can use other parts of an apparatus, be like temperature coefficient (PTC) thermal resistor. These install the parts of an apparatus on PCB to resistor can lift as temperature and increase, limit voltaic flow thereby. Had wanted electric current only big nevertheless (otherwise PTC thermal resistor will turn into open circuit) , as electric current reduce, temperature will drop, return to normal move.
Although need to change no longer fuse, but dispute of PTC thermal resistor is linear, and in view of its job principle, do not apply to the application of wide temperature limits.
Electronic fuse
Electronic fuse (also weigh EFuses, this term is created when rolling out this kind of parts of an apparatus first by Ansenmei) it is to offer basic circuit now to protect function and a kind of replacement scheme of a lot of add functions. Normally, they can have been offerred stream (include short circuit) , press too, retrorse electric current and overheat protection.
Although these innovation parts of an apparatus have a lot of application fields, but they are used at heat to insert normally unplug circumstance, often perhaps appear the setting of power source breakdown. In addition, return the application that can be used at producing laden breakdown extremely likely, or the system that needs to restrict surge electric current.
Make can lead foot and union of photograph of mechanism of control of high accuracy electric current, make this parts of an apparatus shirt-sleeve the function of laden switch and fuse, in becoming contemporary distribution framework, laden dot controls basic form of the system to build module.
The main advantage of electronic fuse depends on flexibility and automatic restoration function, need not the user undertakes intervention. Regard intelligence as parts of an apparatus, these frontal external characteristic make electronic fuse can realize more function in the system, and had not been confined to pressure / shed protection too (electronic fuse shows scene in these respects) .
For example, a lot of electron fuse include Power Good (” PGOOD ” ) cite a base, can cooperate to use with systematic controller, guide accurately by foreword a power supply course. Fuse of a few electrons still includes 3 condition to cite a base, can use at ensuring to guide at the same time connect and close path of many power supply.
Electronic fuse can detect retrorse electric current (traditional fuse cannot come true) , in the application of redundant power source that because this is in,needs ORing very useful. In addition, also apply to the case that closes bring up the rear to need high capacity capacitance to carry charge in the system, use at the surge electric current when limitation is started normally.
Graph 1: Electronic fuse offers a variety of functions to strengthen protection
In a lot of application, capacitance (or the load that allow a gender) may bring a challenge, bring about bigger surge electric current, may damage thereby component or PCB circuitry. Electronic fuse can offer a variety of functions to help design personnel solve this one problem, restore oneself for example or restrict surge electric current, make capacitance charges with controlled means.
Regard intelligence as parts of an apparatus, electronic fuse can monitor temperature, voltage and electric current, transmit data systematic controller. This is detecting breakdown is inchoate when early-warning signal particularly useful.
As the confluence in the car more and more technologies, move reliably to ensure and prevent damage, the demand that protects to circuit also increases subsequently. Circuit protection is attached most importance to especially in the car should, because the voltaic ability enough of batteries destroys accurate electronic cell.
Electronic fuse is used at subsystem normally (look up for example monitor or information entertainment system) in power line, so that disconnect and these systems are shut when malfunction.
Car is located in in the part external in the system, exterior component attaint may bring about short circuit, damage thereby in-house circuit. For example the car holds information system, its are exterior LNA and GPS antenna join through electronic fuse, in order to protect the circuit inside the car.
If differentiate traffic system,be different area, can be inside the system cascade electron fuse, provide integral protection and subsystem protection.
Graph 2: Cascade electron fuse can be used in application of car section control sometimes
For example, prevenient into drive support system (in ADAS) region controller, can mix in power source advocate join between the system advocate fuse, and sub fuse can be used at protection system peripheral, if the ultrasonic of externally mounted jockeys,assist sensor unit.
The wiring harness in contemporary car is a complex subsystem. Once car is assembled,finish, of wiring harness change cost is high and the operation is difficult, protection is accordingly crucial. Wiring harness connective equipment of a lot of bad news phone (electric machinery of window of fan, car, air conditioning, other carry out implement) . Use fuse in the meeting before these systems normally, protect wiring harness to avoid the effect that has sufferred big electric current thereby.
An Sen beautiful NIV(S)3071 is the electronic fuse of a 60 VDC, 65 VTR, become independent 4 the passageway is compositive enclose to individual 5.0 Mm X 6.0 Mm in, every passageway is supportable the permanent current that is as high as 2.5 A (in all 10 A) . The RDSon value of every passageway is 80 M Ω only, ensure electronic fuse the specific power consumption inside falls to more low-level.
All passageways are had can configure voltaic limitation, other function includes to output voltage Qian, the time of the digital sign that indicates trouble, voltaic tripping operation that can configure and fixed 1 Ms are soft start.
NIV3071 can be in – 40oC arrives + the knot of 150oC is lukewarm (the job inside TJ) limits, provide the ESD protection of 2 KV, special apply to the car application with slashing requirement, include 12 V and 48 V.
NIV(S)4461 is an electron fuse, can wait in industrial automation, telegraphic, computation had offerred in application stream, owe press and protection of surge electric current. This parts of an apparatus is supportable be as high as 360 V voltage, and the permanent current that is as high as 4.2 A.
The marked characteristic of this parts of an apparatus includes low resistance (Ω of typical RDSon= 39 M) with time of fast tripping operation. This parts of an apparatus still includes but process designing electric current is restricted (21-157A) , owe press and adjustable changeover rate control. The function that the user can configure includes latch and restore oneself.
NIV(S)4461 uses DFNN1024 to enclose, dimension is 3.0 Mm X 3.0 Mm only. It uses occupation standard to leave crural position, accord with UL2367 and IEC62368 standard.
Circuit protects the main component that is contemporary design, can ensure circuit and systematic dependability, be in malfunction or damage reduces to the greastest extent when accident circumstance.
Although traditional fuse provided the protection of certain level, but contemporary electron fuse has taller precision, bigger flexibility and richer function, rose to protect a level significantly.
Article origin: Ansenmei
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