Achieve the semiconductor solution of high reliability power supply

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Design of high reliability system includes to use fault tolerance to design method and the package that choose to suit, anticipate ambient conditions in order to satisfy and accord with standard requirement. The article discusses the semiconductor solution that achieves high reliability power supply technically, this kind of power source provides protection of redundant, circuit and long-range system management. The article will be outstanding show, how did the improvement of semiconductor technology and new safe function simplify to design, raised the dependability of package. The requirement of system of high reliability power supply is in ideal world, high reliability system should be designed order be no longer in force to can avoid sheet, method is in maintain move (but perhaps be to be on the performance level that reduce) breakdown of the segregation below the circumstance. High reliability system is returned should can restrain breakdown, avoid breakdown to travel downstream or upriver electron component. Buy is a kind of solution redundantly inside, before this can use parallel circuits to carry load to perhaps happen in breakdown with active cent, with reserving mode awaits. In the buy inside avery kind of in redundant means, implementation breakdown detects and management needs additional circuit expense, this raised total complexity and cost. Some systems still built different parallel circuits, in order to increase diversity, avoid to produce identical breakdown mechanism this kind of risk, system of certain flight control is so do. Raised systematic complexity to create greater burden to power source function, because this is tall,changeover efficiency and management of good quantity of heat become crucial, because the knot is lukewarm,every rise 10 ° C, IC life reduces an in part about. We will see no less than in that way, the power source IC with new now rich function and function of special report source control increased to reach its to IC itself all round systematic protection. The voltaic limitation of the manostat of safe function voltage of power source manostat is more and more accurate, the form is more and more complex also, in order to had avoided itself of big parts of an apparatus of attaint of output electric current or downstream component. In-house protection circuit is quite common also, include battery limitation of limitation of retrorse protection, electric current, quantity of heat and electric current are protected reversely. LTC7801 DC/DC switch control implement the product example that improved engineering technology and safe function namely. This parts of an apparatus can bear surely the input voltage that is as high as 150V, provide function of a kind of protection, rise to prep above with inputting voltage but when limits of process designing work, prohibit switch. This kind of function simplified to input power source transient state to protect circuit, reduced package to count dimension of cut solution. Apply develop those who provide protection to press comparator too too in the light of voltage, also can protect output well, fold at the same time return electric current limiter is flowing too and circumstance of short circuit breakdown falls controallable power comsumption. Graph 1: Controller of step-down of LTC7801 high pressure DC/DC the wide interval that cite a base can avoid 　 photograph adjacent high pressure and low pressure bring the electric arc that risk produces between the foot, choose through offerring such enclosing, also enhanced physics to enclose the security of the respect. Puncture voltage is reduced as atmospheric pressure and drop, because this is not the plane application of normal atmospheric pressure to be able to choose LTC3895, this parts of an apparatus provides as same as LTC7801 function and performance, but carry sacrificial vessel 0.

68mm times doubler bring a foot to enclose a choice removedly. Additional, still can use a few have accord with failure mode of alleged FMEA (and influence analysis) the product that derivative foot of the standard configures, fault tolerance LT3007 is for instance linear manostat, in configuration of this kind of derivative foot, if of photograph adjacent bring crural weak point is received together or a certain cite a base by float buy, output maintain be in or under adjust voltage. Control many inputs power source to contain advocate the power source system that power source and power source of a redundant backup still perhaps have an exterior and auxiliary power supply at the same time needs a kind of arbitral system, which power source has priority and monitor in order to decide the condition of these power source. In addition, still must protection system, prevent to produce across to conduct when power source switch with retrorse feed. The odd chip IC such as such as LTC4417 offers a kind of solution, the power source door that inputs definition of user of test and verify in the light of every namely is restricted, choose power source automatically according to this. Another kind of method is the input that moves at the same time by two power source divides a load, raise dependability through reducing the burden of every power source thereby, if every power source is passed,adjust appropriately, can support full laden demand, so this kind of method still can provide protection when a power source malfunctions at the same time. In the past, the likelihood is used all the time simple but the diode with low efficiency " close a road " circuit, but this kind of circuit asks every power source matchs stock source control in order to balance load. Graph 2 show, how ability realizes this kind of control now with individual chip solution. LTC4370 is one all sheds controller, provide retrorse segregation, prevent a power source to malfunction cause engine of delay of system of whole power source. Graph 2: LTC4370 equational 　 transient state and circuit protection for military use and aviation electron product must accord with double redundant power source transient state protection is normative, for example MIL-STD-1275 (car) with) of MIL-STD-704/DO-16 (plane. Nevertheless, people hopes the system is aimed at any high reliability voltage surge, aiguille and ripple provide protection, some products provide function of this kind of protection technically, for example LT4364. In addition, still a variety of circuit protect a function to be able to be used, include LTC4368 this kind of product. LTC4368 is breaker of two-way circuit of a 100V, be aimed at power source voltage too exorbitant, low it is even negative, and in the light of to and shed breakdown to provide protection too reversely. Graph 3: 　 is in the breaker of LTC4368 two-way circuit that provides protective function we can observe in these example, how did the new product that provides increasingly complex protection and safe function simplify to use circuit design, reduced solution size. Power source of imitate of government of system of digital power source adjusts the advantage that has oneself, undertake digital control manage the advantage that also has his remotely in order to support power source system through be based on the PMBus interface of I2C, new-style product is combining these two kinds of advantages. Telemetering can use surveillant load with diagnostic data circumstance, read take chip temperature and undertake with very tall accuracy fine tuning and abundant spend control, thereby utmost raises systematic stability, efficiency and dependability. Issue of a of digital report source control fetching care is the complexity of software, however, LTC3815 carries out a kind of simplifying PMBus " Lite " order volume, not piece inside blame is easy the memory that lose a sex or small controller, it is in simplify design while the benefit that provided digital control and surveillance. Mention before no less than in that way, good quantity of heat is controlled to dependability it is very important, LTC3815 offers door of two class overheat to be restricted to be answered with two class. When in-house chip temperature exceeds 150 ° C, overheat condition is gone to by mark on PMBus, alert brings a foot to pull low with to PMBus advocate parts of an apparatus issues warning. If temperature continues to rise and exceed 170 ° C, so LTC3815 shuts all circuit, include output adjustment circuit, till till overheat condition keeps clear of. This kind can report the system of its condition safeguarded means to offer an opportunity for the change, arrange change to go to those who be based on condition to safeguard from the maintenance that is based on time namely, form likely in systematic breakdown before, protruding dominance can drop problem. System of power supply of high reliability of segregation type system includes base of power of a segregation normally, with protecting power source bus line to spare downstream circuitry can change the attaint of unit breakdown. Additional, the sensor that increases ceaselessly and carry out implement amount also is prompting the demand to power source of type of lesser, local segregation and data interface, aim to decrease come from ground connection annulus road and in all the noise induction problem that the model disturbs. There had been solution of module of complete voltaic segregation BGA now, be designed in order to simplify and raise dependability. LTM9100 segregation switch control implement it is an unifinication solution, with the tall voltage power source that is as high as 1000VDC at control, protection and surveillance. Base of power of electric segregation of a 5kVRMS kept apart digital interface and switch control implement, thereby but drive MOSFET of raceway groove of an exterior N or IGBT switch. Can reach temperature to undertake the number is measured keeping apart type to voltage of load current, bus line through I2C/SMBus interface, the power that achieves tall voltage bus line thereby and specific power consumption are surveillant. Graph 4: The LTM9100 that provides telemetering function keeps apart type switch control implement 　 component chooses major content uses the article technically to discuss simplify the new function that high reliability power supply designs, perhaps be aimed at breakdown or the product function that crude use circumstance protects parts of an apparatus. However, crucial is, the value that does not ignore package quality anticipates with be aimed at ambient conditions chooses the importance of correct component level. For example the for military use of ADI is plastic enclosed grade parts of an apparatus to offer a course 100% tests and have assuring property (in - 55 ° C comes + the) inside limits of temperature of 125 ° C, the in using circuit component that prevented very astringent to anticipating presence condition thereby undertakes costly of 2 screening or characteristic analysis need. Conclusion depends on an user but more careful and process designing character, complex piece inside protective mechanism and cut integral solution is occupied board of the area taller compositive degree, already made the design of high reliability power supply is able to simplify. Government of system of digital power source offerred surveillance of methodological beyond Cheng and system of control power source and further improvement efficiency and dependability. Finally, choose a credit the correct component grade of good supplier will reduce the possibility that produces quality and dependability problem. CNC Milling CNC Machining