CN108460198A - Method and device for acquiring electrothermal safe working area and computer readable storage medium - Google Patents
Method and device for acquiring electrothermal safe working area and computer readable storage medium Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000003860 storage Methods 0.000 title claims abstract description 12
- 230000015556 catabolic process Effects 0.000 claims abstract description 29
- 238000005485 electric heating Methods 0.000 claims abstract description 7
- 230000001012 protector Effects 0.000 claims description 124
- 238000009792 diffusion process Methods 0.000 claims description 52
- 230000001681 protective effect Effects 0.000 claims description 9
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
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Abstract
The invention provides a method and a device for acquiring an electrothermal safe working area and a computer readable storage medium, which are applied to an electrostatic discharge protection device of a thyristor structure. The method for acquiring the electric heating safe working area comprises the following steps: constructing an equivalent thermal circuit model according to the structure of the electrostatic discharge protection device to obtain the maximum safe dissipation power; and acquiring an electric heating safe working area according to the maximum safe dissipation power, the maximum safe current, the maximum safe voltage and the maximum safe secondary breakdown power. By adopting the technical scheme, the invention can solve the problems that the dissipation power of the electric heating safety working area is roughly determined by an empirical value, the actual working conditions of the electric heating safety working area and the electrostatic discharge protection device obtained based on the dissipation power are greatly deviated, and the electrostatic discharge protection device cannot be effectively protected.
Description
【Technical field】
The present invention relates to electronic technology field more particularly to a kind of method, apparatus and meter obtaining safety electric workspace
Calculation machine readable storage medium storing program for executing.
【Background technology】
Traditional static discharge (Electro Static Discharge, ESD) protection device is in transient high voltages, big electricity
Under stream impact, current-voltage (I-U) characteristic curve often shows a common feature：As shown in Figure 1, being reached in voltage
When to certain limit, curve shows apparent negative resistance hysteresis (Snapback) phenomenon, is embodied in：Electric current increased dramatically,
And voltage persistently reduces hysteresis, and second breakdown or thermal breakdown occurs, ESD protective device electric heating is caused to fail to normal work
Make.Safety electric workspace (SafeOperation Area, SOA) is as measurement ESD protective device electrocaloric effect microphysics
One intuitive presentation of mechanism of action, thus it is common to use safety electric workspace illustrates the trouble free service of ESD protective device
Range.
However, the dissipated power of safety electric workspace is determined roughly by empirical value in the prior art, obtained based on this
There is very large deviation in the real work situation of safety electric workspace and ESD protective device, into being unable to be effectively protected ESD
Protect device.
【Invention content】
In view of this, an embodiment of the present invention provides a kind of method, apparatus and computer of acquisition safety electric workspace
Readable storage medium storing program for executing, the dissipated power to solve safety electric workspace in the prior art is determined roughly by empirical value, is based on
There is very large deviation in the real work situation for the safety electric workspace and ESD protective device that this is obtained, effective into being unable to
Protect the problem of ESD protective device in ground.
On the one hand, an embodiment of the present invention provides a kind of method of acquisition safety electric workspace, it is applied to thyristor knot
The electrostatic discharge protector of structure, this method include：
According to the structure of electrostatic discharge protector, the Equivalent heat path model of the electrostatic discharge protector is constructed；
According to the Equivalent heat path model, the safe dissipated power of maximum of the electrostatic discharge protector is obtained；
According to the safe dissipated power of the maximum, maximum safe current, maximum safe voltage and maximum safe second breakdown
Power obtains the safety electric workspace of the electrostatic discharge protector.
The aspect and any possible implementation manners as described above, it is further provided a kind of realization method, according to described etc.
Thermal circuit model is imitated, the safe dissipated power of maximum of the electrostatic discharge protector is obtained, including：
According to the Equivalent heat path model, the thermal diffusion time of acquisition dissipated power and the electrostatic discharge protector,
Correspondence between thermal diffusion temperature；
According to the correspondence, the maximum value of dissipated power is obtained, using as the safe dissipated power of maximum.
The aspect and any possible implementation manners as described above, it is further provided a kind of realization method, when the electrostatic
When discharge prevention device thermal diffusion time is less than first time threshold, the correspondence can be expressed as：
Wherein, PfFor dissipated power, a is the hexahedral width of equivalent parallel, and b is the hexahedral length of equivalent parallel, CpFor
The thermal capacitance of the electrostatic discharge protector, TcFor the thermal diffusion temperature, T0For environment temperature, tfFor the out-of-service time.
The aspect and any possible implementation manners as described above, it is further provided a kind of realization method, when the electrostatic
When discharge prevention device thermal diffusion time is more than or equal to first time threshold and is less than second time threshold, the corresponding pass
System can be expressed as：
Wherein, PfFor dissipated power, a is the hexahedral width of equivalent parallel, and b is the hexahedral length of equivalent parallel, and K is
Boltzmann constant, ρ are the volume density of the electrostatic discharge protector, CpFor the thermal capacitance of the electrostatic discharge protector, Tc
For the thermal diffusion temperature, T0For environment temperature, tfFor out-of-service time, tcFor first time threshold.
The aspect and any possible implementation manners as described above, it is further provided a kind of realization method, when the electrostatic
When discharge prevention device thermal diffusion time is more than or equal to second time threshold and is less than third time threshold, the corresponding pass
System can be expressed as：
Wherein, PfFor dissipated power, a is the hexahedral width of equivalent parallel, and b is the hexahedral length of equivalent parallel, and c is
The hexahedral height of equivalent parallel, K are Boltzmann constant, TcFor the thermal diffusion temperature, T0For environment temperature, tfFor failure
Time, tbFor second time threshold.
The aspect and any possible implementation manners as described above, it is further provided a kind of realization method, when the electrostatic
When discharge prevention device thermal diffusion time is more than or equal to third time threshold, the correspondence can be expressed as：
Wherein, PfFor dissipated power, a is the hexahedral width of equivalent parallel, and b is the hexahedral length of equivalent parallel, and c is
The hexahedral height of equivalent parallel, K are Boltzmann constant, TcFor the thermal diffusion temperature, T0For environment temperature, tbIt is second
Time threshold, taFor third time threshold.
The aspect and any possible implementation manners as described above, it is further provided a kind of realization method, according to it is described most
Big safe dissipated power, maximum safe current, maximum safe voltage and maximum safe second breakdown power, obtain the electrostatic and put
The safety electric workspace of electric protective component, including：
By the safe dissipated power of the maximum, maximum safe current, maximum safe voltage and maximum safe second breakdown work(
Rate obtains the safety electric workspace as boundary condition, so that the dissipated power of the safety electric workspace is less than
Or it is equal to the safe dissipated power of maximum, the electric current of the safety electric workspace is less than or equal to the maximum safety
The voltage of electric current, the safety electric workspace is less than or equal to the maximum safe voltage, the safety electric workspace
Second breakdown power be less than or equal to the safe second breakdown power of the maximum.
The aspect and any possible implementation manners as described above, it is further provided a kind of realization method is executing basis
The safe dissipated power of the maximum, maximum safe current, maximum safe voltage and maximum safe second breakdown power, described in acquisition
Before the safety electric workspace of electrostatic discharge protector, the method further includes：
The maximum saturation electric current for obtaining the electrostatic discharge protector, using as the maximum safe current；And it obtains
The avalanche breakdown voltage for taking the electrostatic discharge protector, using as the maximum safe voltage.
On the other hand, an embodiment of the present invention provides a kind of device of acquisition safety electric workspace, which includes：
Structural unit, for according to the structure of electrostatic discharge protector, construct the electrostatic discharge protector etc.
Imitate thermal circuit model；
First acquisition unit, for according to the Equivalent heat path model, obtaining the maximum of the electrostatic discharge protector
Safe dissipated power；
Second acquisition unit, for according to the safe dissipated power of maximum, maximum safe current, maximum safe voltage and
Maximum safe second breakdown power, obtains the safety electric workspace of the electrostatic discharge protector.
In another aspect, an embodiment of the present invention provides a kind of computer readable storage mediums, which is characterized in that including：Meter
Calculation machine executable instruction executes the side of acquisition safety electric workspace above-mentioned when the computer executable instructions are run
Method.
A technical solution in above-mentioned technical proposal has the advantages that：
In the embodiment of the present invention, the structure based on electrostatic discharge protector, construct the electrostatic discharge protector etc.
Imitate thermal circuit model, the equivalent thermal circuit model to characterize the actual physical conductive process of thermal capacity in electrostatic discharge protector,
Based on the equivalent thermal circuit model, the exact value of the safe dissipated power of maximum of the electrostatic discharge protector can be obtained, is compared
In the mode for determining maximum safe dissipated power roughly by empirical value in the prior art, an embodiment of the present invention provides a kind of accurate
The method for obtaining maximum safe dissipated power, to which the safety electric workspace obtained based on this is more accurate, can be effectively
Play the role of protecting electrostatic discharge protector.
【Description of the drawings】
Fig. 1 is electrostatic discharge protector characteristic working curve schematic diagram in the prior art；
A kind of schematic diagram of the electrostatic discharge protector for thyristor structure that Fig. 2 is provided by the embodiment of the present invention；
The flow diagram for obtaining safety electric workspace that Fig. 3 is provided by the embodiment of the present invention；
The Equivalent heat path model schematic for the electrostatic discharge protector that Fig. 4 is provided by the embodiment of the present invention；
The flow of the safe dissipated power of maximum for the acquisition electrostatic discharge protector that Fig. 5 is provided by the embodiment of the present invention
Schematic diagram；
The example that Fig. 6 is provided by the embodiment of the present invention；
Another example that Fig. 7 is provided by the embodiment of the present invention；
The equivalent parallelepiped of active area for the electrostatic discharge protector that Fig. 8 is provided by the embodiment of the present invention
Schematic diagram；
The functional block diagram for the acquisition safety electric work area equipment that Fig. 9 is provided by the embodiment of the present invention.
【Specific implementation mode】
For a better understanding of the technical solution of the present invention, being retouched in detail to the embodiment of the present invention below in conjunction with the accompanying drawings
It states.
It will be appreciated that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained without creative efforts it is all its
Its embodiment, shall fall within the protection scope of the present invention.
The term used in embodiments of the present invention is the purpose only merely for description specific embodiment, is not intended to be limiting
The present invention.In the embodiment of the present invention and "an" of singulative used in the attached claims, " described " and "the"
It is also intended to including most forms, unless context clearly shows that other meanings.
Depending on context, word as used in this " if " can be construed to " ... when " or " when ...
When " or " in response to determination " or " in response to detection ".Similarly, depend on context, phrase " if it is determined that " or " if detection
(condition or event of statement) " can be construed to " when determining " or " in response to determination " or " when the detection (condition of statement
Or event) when " or " in response to detection (condition or event of statement) ".
Embodiment one
The embodiment of the present invention provides a kind of method of acquisition safety electric workspace, and this method is applied to thyristor structure
Electrostatic discharge protector.Referring to FIG. 2, a kind of static discharge of its thyristor structure provided by the embodiment of the present invention is protected
Protect the schematic diagram of device.As shown in Fig. 2, the electrostatic discharge protector is using P-type semiconductor as substrate, including N traps and p-well, table
Face N-type semiconductor draws drain electrode, and field oxygen zone draws grid and PN junction draws source electrode.
Specifically, referring to FIG. 3, it is illustrated by the flow for obtaining safety electric workspace that the embodiment of the present invention provides
Figure.As shown in figure 3, this approach includes the following steps：
S301 constructs the Equivalent heat path model of electrostatic discharge protector according to the structure of electrostatic discharge protector.
It should be noted that electrostatic discharge protector is made of various material layers, each material layer can all be equivalent to one
The parallel-connection structure of a thermal resistance and a thermal capacitance, for example, material layer 1 can be equivalent to thermal resistance Rth1With thermal capacitance Cth1Parallel-connection structure, material
The bed of material 2 can be equivalent to thermal resistance Rth2With thermal capacitance Cth2Parallel-connection structure, and so on, material layer n can be equivalent to thermal resistance RthnWith thermal capacitance
CthnParallel-connection structure, n is positive integer more than 0.
During a concrete implementation, referring to FIG. 4, its electrostatic discharge (ESD) protection for being provided by the embodiment of the present invention
The Equivalent heat path model schematic of device.As shown in figure 4, the electrostatic discharge protector, using P-type semiconductor as substrate, surface is wrapped
The drain electrode drawn by N-type semiconductor is included, the grid drawn by field oxygen zone and the source electrode drawn by PN junction.Specifically, N-type is partly led
Body is equivalent to thermal resistance Rth1With thermal capacitance Cth1Parallel-connection structure, field oxygen zone is equivalent to thermal resistance Rth2With thermal capacitance Cth2Parallel-connection structure, PN
Knot is equivalent to thermal resistance Rth3With thermal capacitance Cth3Parallel-connection structure, remaining each material layer can be equivalent to thermal resistance and thermal capacitance in this mode
Parallel-connection structure, the embodiment of the present invention repeat no more this.
S302 obtains the safe dissipated power of maximum of electrostatic discharge protector according to Equivalent heat path model.
S303, according to maximum safe dissipated power, maximum safe current, maximum safe voltage and maximum safe second breakdown
Power obtains the safety electric workspace of electrostatic discharge protector.
Hereinafter, being illustrated respectively to above steps.Specifically, referring to FIG. 5, it is provided by the embodiment of the present invention
Acquisition electrostatic discharge protector the safe dissipated power of maximum flow diagram.As shown in figure 5, executing S302 steps
When, it can realize in the following way：
S3021 obtains thermal diffusion time, the heat of dissipated power and electrostatic discharge protector according to Equivalent heat path model
Correspondence between diffusion temperature.
S3022 obtains the maximum value of dissipated power according to correspondence, using as maximum safe dissipated power.
Hereinafter, the mode for executing acquisition correspondence in S3021 steps is specifically described.
Under normal running conditions, electrostatic discharge protector itself will produce faint heat, for ease of using Green's letter
Number method is solved, and the heat source that electrostatic discharge protector itself is generated is equivalent to be the sphere of r at radius, and assumes that electrostatic is put
Speed of diffusion is constant inside electric protective component, and outside does not have heat source, dissipated power P, then inside electrostatic discharge protector
The process of thermal diffusion can be described as using Poisson's equation：
Wherein,It is Hamiltonian, T (r, t) is the thermal diffusion temperature with equivalent sphere radius r and thermal diffusion time t variations
Degree, P is the dissipated power of electrostatic discharge protector, and V is the volume of electrostatic discharge protector, and ρ is electro-static discharge protector
The volume density of part, CpIt is the thermal capacitance of electrostatic discharge protector material, Δ is Laplace operator.
When static discharge (Electro Static Discharge, ESD) pulse generation acts on, electro-static discharge protector
Part is triggered, and surface heat increases rapidly under esd pulse effect.Due to the conduction of heat of material, electro-static discharge protector
The surface heat of part is internally quickly spread, and each material layer that heat is then configured electrostatic discharge protector is absorbed.
In one example, electrostatic discharge protector is in bias current I=100mA, the test-strips of operating voltage U=5V
Under part, surface temperature distribution schematic diagram is as shown in Figure 6.As can be seen from Figure 6, the heat of electrostatic discharge protector concentrates on center
Area, and other regional temperature values are very low.
In another example, with thermal infrared imager to electrostatic discharge protector different esd pulse power effect under
The temperature of center measures, electrostatic discharge protector center temperature changing process to be described.Such as Fig. 7 institutes
Show, 1 corresponding esd pulse power of curve is 1W, and the temperature changing process of electrostatic discharge protector center is with heating
The increase of time, temperature are gradually increased, and after reaching 31 DEG C of temperature maximum, temperature is begun to decline, when heated between be ESD
When pulse period end, temperature value tends to room temperature.2 corresponding esd pulse power of curve is 2W, electrostatic discharge protector temperature
Change curve esd pulse power corresponding with curve 1 is the temperature variation curve of 1W in addition to temperature maximum and individual time point
Temperature value some deviations outside, temperature changing trend and shape are essentially identical, are all that experienced a heating, cooling, most final temperature
Degree is restored to the process of house temperature.
According to law of conservation of energy, Electro-Static Discharge protects the heat of device inside conduction to be equal to the heat and suction that itself is generated
The sum of the heat that esd pulse generates is received, electrostatic discharge protector internal heat conductive process can be expressed as following formula：
Wherein,It is the heat conducted inside electrostatic discharge protector, t is thermal diffusion time,
It is the heat that electrostatic discharge protector itself generates, V is the volume of electrostatic discharge protector,It is Hamiltonian,
It is the heat that electrostatic discharge protector absorbs that esd pulse generates, q (t) is the thermal energy that the conversion of esd pulse electric heating generates, and ρ is quiet
Discharge of electricity protects the volume density of device, CpIt is the thermal capacitance of electrostatic discharge protector material.
Formula (1) is substituted into formula (2) to obtain：
Wherein, T (r, t) is with the thermal diffusion temperature of equivalent sphere radius r and thermal diffusion time t variations, T0It is environment temperature
Degree, K is Boltzmann constant, and Δ is Laplace operator.
Formula (3) is solved using Green's function, obtains electrostatic discharge protector thermal diffusion time, thermal diffusion temperature
Correspondence between dissipated power, i.e.,：
Wherein, S (r, t) is the surface area of heat source institute equivalent sphere, can specifically be obtained by following formula：
Wherein, K is Boltzmann constant, and Δ is Laplace operator, and erfc indicates complementary error function.
Under the effect of external esd pulse, thermal diffusion temperature maximum appears in geometry inside electrostatic discharge protector
At the heart, r=0, thermal diffusion time t are equal to out-of-service time t at this timef, when the dissipated power of electrostatic discharge protector and thermal diffusion
Between, the correspondence between thermal diffusion temperature can be embodied as following formula：
Wherein, PfIt is the dissipated power of electrostatic discharge protector, ρ is the volume density of electrostatic discharge protector, CpIt is quiet
Discharge of electricity protects the thermal capacitance of device material, and Δ is Laplace operator, T0It is environment temperature, erf indicates error function, tcIt is
One time threshold, tbIt is second time threshold, taIt is third time threshold.
In concrete implementation mode, first time threshold, second time threshold and third time threshold can be according to warps
Value is tested to be pre-set, it can also be according to following implementations to first time threshold, second time threshold and third time
Threshold value is preset.
Specifically, the characteristic size due to electrostatic discharge protector is very small, deep sub-micron level is had reached.Therefore,
When calculating the dissipated power of the electrostatic discharge protector, the active area of electrostatic discharge protector can be equivalent to parallel
Hexahedron.As shown in figure 8, equivalent parallel of the active area of its electrostatic discharge protector provided by the embodiment of the present invention
The length of hexahedral schematic diagram, electrostatic discharge protector active area 800 is b, width a, is highly c.
According to the parallelepiped, first time threshold can be expressed as：
Wherein, tcIt is first time threshold, c is the height of the equivalent parallelepiped, and V is electrostatic discharge protector
Volume.
Second time threshold can be expressed as：
Wherein, tbIt is second time threshold, b is the length of the equivalent parallelepiped, and V is electrostatic discharge protector
Volume.
Third time threshold can be expressed as：
Wherein, taIt is third time threshold, a is the width of the equivalent parallelepiped, and V is electrostatic discharge protector
Volume.
Based on this, the dissipated power of electrostatic discharge protector is corresponding between thermal diffusion time, thermal diffusion temperature to close
System may include following four situation：
The first, when electrostatic discharge protector thermal diffusion time t is less than first time threshold tcWhen, static discharge is protected
The correspondence protected between the dissipated power and thermal diffusion time, thermal diffusion temperature of device can be expressed as：
Wherein, PfFor dissipated power, a is the hexahedral width of equivalent parallel, and b is the hexahedral length of equivalent parallel, CpFor
The thermal capacitance of electrostatic discharge protector, TcFor thermal diffusion temperature, T0For environment temperature, tfFor the out-of-service time.
Second, when electrostatic discharge protector thermal diffusion time t is more than or equal to first time threshold tcAnd it is small
In second time threshold tbWhen, pair between the dissipated power and thermal diffusion time of electrostatic discharge protector, thermal diffusion temperature
Should be related to can be expressed as：
Wherein, PfFor dissipated power, a is the hexahedral width of equivalent parallel, and b is the hexahedral length of equivalent parallel, and K is
Boltzmann constant, ρ are the volume density of electrostatic discharge protector, CpFor the thermal capacitance of electrostatic discharge protector, TcFor thermal diffusion
Temperature, T0For environment temperature, tfFor out-of-service time, tcFor first time threshold.
The third, when electrostatic discharge protector thermal diffusion time t is more than or equal to second time threshold tbAnd it is small
In third time threshold taWhen, pair between the dissipated power and thermal diffusion time of electrostatic discharge protector, thermal diffusion temperature
Should be related to can be expressed as：
Wherein, PfFor dissipated power, a is the hexahedral width of equivalent parallel, and b is the hexahedral length of equivalent parallel, and c is
The hexahedral height of equivalent parallel, K are Boltzmann constant, TcFor thermal diffusion temperature, T0For environment temperature, tfFor the out-of-service time,
tbFor second time threshold.
4th kind, when electrostatic discharge protector thermal diffusion time t is more than or equal to third time threshold taWhen, it is quiet
Correspondence between the dissipated power and thermal diffusion time, thermal diffusion temperature of discharge of electricity protection device can be expressed as：
Wherein, PfFor dissipated power, a is the hexahedral width of equivalent parallel, and b is the hexahedral length of equivalent parallel, and c is
The hexahedral height of equivalent parallel, K are Boltzmann constant, TcFor thermal diffusion temperature, T0For environment temperature, tbFor the second time
Threshold value, taFor third time threshold.
In the embodiment of the present invention, when executing S303 steps, it can realize in the following way：
Maximum safe dissipated power, maximum safe current, maximum safe voltage and maximum safe second breakdown power are made
For boundary condition, safety electric workspace is obtained, so that the dissipated power of safety electric workspace is less than or equal to maximum
The electric current of safe dissipated power, safety electric workspace is less than or equal to maximum safe current, the electricity of safety electric workspace
Pressure is less than or equal to maximum safe voltage, and the second breakdown power of safety electric workspace is less than or equal to maximum safety two
Secondary breakdown power.
According to the maximum saturation electric current of electrostatic discharge protector, maximum safe current is obtained.
Specifically, under largest gate bias, the electric current for flowing through electrostatic discharge protector is maximum saturation electric current.
According to the avalanche breakdown voltage of electrostatic discharge protector, maximum safe voltage is obtained.
Specifically, the voltage when avalanche effect occurs for electrostatic discharge protector is avalanche breakdown voltage, it is a fixation
Constant.
In the embodiment of the present invention, electro-static discharge protector need not be destroyed by obtaining maximum safe current and maximum safe voltage
Part.
The second breakdown power of electrostatic discharge protector be material properties by constituting electrostatic discharge protector and
What manufacturing technology level determined, be a fixed constant, as maximum safe second breakdown power.
The embodiment of the present invention is for the safe dissipated power of maximum for obtaining the electrostatic discharge protector, maximum safety electricity
The sequence of stream, maximum safe voltage and maximum safe second breakdown power is not particularly limited.
The technical solution of the embodiment of the present invention has the advantages that：
In the embodiment of the present invention, the structure based on electrostatic discharge protector, construct the electrostatic discharge protector etc.
Imitate thermal circuit model, the equivalent thermal circuit model to characterize the actual physical conductive process of thermal capacity in electrostatic discharge protector,
Based on the equivalent thermal circuit model, the exact value of the safe dissipated power of maximum of the electrostatic discharge protector can be obtained, is compared
In the mode for determining maximum safe dissipated power roughly by empirical value in the prior art, an embodiment of the present invention provides a kind of accurate
The method for obtaining maximum safe dissipated power, to which the safety electric workspace obtained based on this is more accurate, can be effectively
Play the role of protecting electrostatic discharge protector.
Embodiment two
Based on the method for obtaining safety electric workspace that above-described embodiment one is provided, the embodiment of the present invention is further given
Go out to realize the device embodiment of each step and method in above method embodiment.
On the one hand, the embodiment of the present invention provides a kind of device of acquisition safety electric workspace.
Specifically, referring to FIG. 9, the function of its acquisition safety electric work area equipment provided by the embodiment of the present invention
Block diagram.As shown in figure 9, the device includes：
Structural unit 901 constructs the equivalent of electrostatic discharge protector for the structure according to electrostatic discharge protector
Thermal circuit model；
First acquisition unit 902, for according to Equivalent heat path model, obtaining the maximum safety consumption of electrostatic discharge protector
Dissipate power；
Second acquisition unit 903, for according to maximum safe dissipated power, maximum safe current, maximum safe voltage with
Maximum safe second breakdown power, obtains the safety electric workspace of electrostatic discharge protector.
On the other hand, the embodiment of the present invention provides a kind of computer readable storage medium.
Specifically, computer readable storage medium includes computer executable instructions, when computer executable instructions quilt
When operation, it is able to carry out the method for obtaining safety electric workspace gone out given in the embodiment of the present invention.
The method that acquisition safety electric workspace shown in Fig. 3 is able to carry out by each unit in this present embodiment, this reality
The part that example is not described in detail is applied, the related description to Fig. 3 is can refer to.
The technical solution of the embodiment of the present invention has the advantages that：
In the embodiment of the present invention, the structure based on electrostatic discharge protector, construct the electrostatic discharge protector etc.
Imitate thermal circuit model, the equivalent thermal circuit model to characterize the actual physical conductive process of thermal capacity in electrostatic discharge protector,
Based on the equivalent thermal circuit model, the exact value of the safe dissipated power of maximum of the electrostatic discharge protector can be obtained, is compared
In the mode for determining maximum safe dissipated power roughly by empirical value in the prior art, an embodiment of the present invention provides a kind of accurate
The method for obtaining maximum safe dissipated power, to which the safety electric workspace obtained based on this is more accurate, can be effectively
Play the role of protecting electrostatic discharge protector.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided by the present invention, it should be understood that disclosed system, device and method can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of division of logic function, formula that in actual implementation, there may be another division manner, for example, multiple units or group
Part can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown
Or the mutual coupling, direct-coupling or communication connection discussed can be by some interfaces, device or unit it is indirect
Coupling or communication connection can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple
In network element.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.Above-mentioned integrated list
The form that hardware had both may be used in member is realized, can also be realized in the form of hardware adds SFU software functional unit.
The above-mentioned integrated unit being realized in the form of SFU software functional unit can be stored in one and computer-readable deposit
In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions are used so that a computer
It is each that device (can be personal computer, server or network equipment etc.) or processor (Processor) execute the present invention
The part steps of embodiment the method.And storage medium above-mentioned includes：USB flash disk, mobile hard disk, read-only memory (Read-
Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disc or CD etc. it is various
The medium of program code can be stored.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent substitution, improvement and etc. done should be included within the scope of protection of the invention god.
Claims (10)
1. a kind of method obtaining safety electric workspace, which is characterized in that be applied to the electrostatic discharge (ESD) protection of thyristor structure
Device, the method includes：
According to the structure of electrostatic discharge protector, the Equivalent heat path model of the electrostatic discharge protector is constructed；
According to the Equivalent heat path model, the safe dissipated power of maximum of the electrostatic discharge protector is obtained；
According to the safe dissipated power of the maximum, maximum safe current, maximum safe voltage and maximum safe second breakdown power,
Obtain the safety electric workspace of the electrostatic discharge protector.
2. according to the method described in claim 1, it is characterized in that, according to the Equivalent heat path model, obtains the electrostatic and put
The safe dissipated power of maximum of electric protective component, including：
According to the Equivalent heat path model, thermal diffusion time, the thermal expansion of dissipated power and the electrostatic discharge protector are obtained
Dissipate the correspondence between temperature；
According to the correspondence, the maximum value of dissipated power is obtained, using as the safe dissipated power of maximum.
3. according to the method described in claim 2, it is characterized in that, when the electrostatic discharge protector thermal diffusion time is less than
When first time threshold, the correspondence can be expressed as：
Wherein, PfFor dissipated power, a is the hexahedral width of equivalent parallel, and b is the hexahedral length of equivalent parallel, CpIt is described
The thermal capacitance of electrostatic discharge protector, TcFor the thermal diffusion temperature, T0For environment temperature, tfFor the out-of-service time.
4. according to the method described in claim 2, it is characterized in that, when the electrostatic discharge protector thermal diffusion time is more than
Or equal to first time threshold and when being less than second time threshold, the correspondence can be expressed as：
Wherein, PfFor dissipated power, a is the hexahedral width of equivalent parallel, and b is the hexahedral length of equivalent parallel, and K is Bohr
Hereby graceful constant, ρ are the volume density of the electrostatic discharge protector, CpFor the thermal capacitance of the electrostatic discharge protector, TcFor institute
State thermal diffusion temperature, T0For environment temperature, tfFor out-of-service time, tcFor first time threshold.
5. according to the method described in claim 2, it is characterized in that, when the electrostatic discharge protector thermal diffusion time is more than
Or equal to second time threshold and when being less than third time threshold, the correspondence can be expressed as：
Wherein, PfFor dissipated power, a is the hexahedral width of equivalent parallel, and b is the hexahedral length of equivalent parallel, and c is equivalent
The height of parallelepiped, K are Boltzmann constant, TcFor the thermal diffusion temperature, T0For environment temperature, tfFor the out-of-service time,
tbFor second time threshold.
6. according to the method described in claim 2, it is characterized in that, when the electrostatic discharge protector thermal diffusion time is more than
Or when equal to third time threshold, the correspondence can be expressed as：
Wherein, PfFor dissipated power, a is the hexahedral width of equivalent parallel, and b is the hexahedral length of equivalent parallel, and c is equivalent
The height of parallelepiped, K are Boltzmann constant, TcFor the thermal diffusion temperature, T0For environment temperature, tbFor the second time
Threshold value, taFor third time threshold.
7. according to the method described in claim 1, it is characterized in that, according to the safe dissipated power of the maximum, maximum safety electricity
Stream, maximum safe voltage and maximum safe second breakdown power, obtain the safety electric work of the electrostatic discharge protector
Area, including：
The safe dissipated power of the maximum, maximum safe current, maximum safe voltage and maximum safe second breakdown power are made
For boundary condition, obtain the safety electric workspace so that the dissipated power of the safety electric workspace be less than or
Equal to the safe dissipated power of maximum, the electric current of the safety electric workspace is less than or equal to the maximum safety electricity
The voltage of stream, the safety electric workspace is less than or equal to the maximum safe voltage, the safety electric workspace
Second breakdown power is less than or equal to the safe second breakdown power of the maximum.
8. the method according to the description of claim 7 is characterized in that executing according to the safe dissipated power of the maximum, maximum
Safe current, maximum safe voltage and maximum safe second breakdown power, obtain the electric heating peace of the electrostatic discharge protector
Before full workspace, the method further includes：
The maximum saturation electric current for obtaining the electrostatic discharge protector, using as the maximum safe current；And obtain institute
The avalanche breakdown voltage for stating electrostatic discharge protector, using as the maximum safe voltage.
9. a kind of device obtaining safety electric workspace, which is characterized in that described device includes：
Structural unit constructs the equivalent heat of the electrostatic discharge protector for the structure according to electrostatic discharge protector
Road model；
First acquisition unit, for according to the Equivalent heat path model, obtaining the maximum safety of the electrostatic discharge protector
Dissipated power；
Second acquisition unit, for according to the safe dissipated power of the maximum, maximum safe current, maximum safe voltage and maximum
Safe second breakdown power obtains the safety electric workspace of the electrostatic discharge protector.
10. a kind of computer readable storage medium, which is characterized in that including：Computer executable instructions, when the computer can
Execute instruction the method for obtaining safety electric workspace executed when being run as described in claim 1-8 any one.
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