CN106443499B - Hand-held direct-current switch power supply exports intrinsic safety detection method - Google Patents
Hand-held direct-current switch power supply exports intrinsic safety detection method Download PDFInfo
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- CN106443499B CN106443499B CN201610712072.8A CN201610712072A CN106443499B CN 106443499 B CN106443499 B CN 106443499B CN 201610712072 A CN201610712072 A CN 201610712072A CN 106443499 B CN106443499 B CN 106443499B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
Abstract
The invention discloses a kind of hand-held direct-current switch power supplies to export intrinsic safety detection method, its detector used includes micro controller module ,+5V power supply and+3.3V power circuit, micro controller module includes DSP digital signal processor and the crystal oscillating circuit and reset circuit that connect with DSP digital signal processor, the input of DSP digital signal processor is terminated with button operation circuit, the output of DSP digital signal processor is terminated with liquid crystal display circuit, and the output of+3.3V power circuit, which is terminated with, powers on indicator light circuit；Its detection method is comprising steps of one, parameter inputs, Step 2: calculating minimum ignition energy WB, Step 3: calculating the spark energy W that direct-current switch power supply once dischargesΣ, Step 4: judging and showing that direct-current switch power supply exports intrinsic safety.It is convenient that the present invention realizes, detects high reliablity, and intuitive display is easy to operate, at low cost, applied widely, practical.
Description
Technical field
The invention belongs to switch power technology fields, and in particular to a kind of hand-held direct-current switch power supply output intrinsic safety detection
Method.
Background technique
With the rapid development of the inflammable and explosive industry production such as coal mine, petrochemical industry and natural gas and management automation, direct current is opened
Powered-down source is more and more widely used in such industry.Associated safety regulation regulation, is applied to explosive hazard environment
Electric/electronic device must satisfy requirement of explosion proof.Essential safety (abbreviation intrinsic safety) type explosion-proof electrification electronic equipment has safe journey
The advantages that highest, volume are minimum and cost is minimum is spent, so it is used for the electric/electronic device of dangerous place with a potential explosion, it is always preferred
Intrinsic safety type.Correct evaluation circuit intrinsic safe explosion-proof performance simultaneously carries out authenticating authority to it, is intrinsic safety products application in inflammable and explosive danger
The premise of dangerous environment.Therefore, direct-current switch power supply intrinsic safety performance evaluation and authentication question become increasingly conspicuous.
The evaluation and certification of direct-current switch power supply intrinsic safety performance can only use the safety spark based on IEC standard at present
Experimental provision carries out this most direct detection method of explosibility test, however structure is complicated that manufacture is difficult for the experimental rig, together
When its operating process it is many and diverse and take longer, relevant operation personnel also need specialized training and have higher skill.Therefore, the test
It can only be carried out in the specified authorized organization of minority, such as China Quality Supervision & Testing Center for Explosion-proof Electric Products, coal design and research institute
Shanghai Branch etc., this make the inspection of intrinsic safety product trouble while often wait inspection the time it is long, ground to substantially prolong intrinsic safety product
Period processed increases cost, limits the popularization and application of intrinsic safe explosion-proof product.
More importantly the short circuit of explosibility test and open circuit moment are random, and for DC Switching Converter
For (such as Buck, Boost) such strong nonlinearity time-varying circuit, inductive current and output filter capacitor voltage are equal
For variable, inductance open circuit or capacitance short-circuit occur for the different moments in a switch periods, and discharge energy is dramatically different, bright
Video memory is at a most dangerous open circuit moment and short-circuit moment, therefore, according to the explosibility test of IEC safety spark experimental rig
The probability correctly evaluated is made to circuit intrinsic safety performance to be significantly reduced, this necessarily gives the inflammable and explosive row such as coal mine, petrochemical industry, natural gas
The production of industry brings major safety risks.In view of this, what many researchers proposed for linear circuits such as simple inductive circuits
Some non-explosion intrinsic safety criterions, the various minimums provided with standard are lighted as curve, are not suitable for DC Switching Converter
Intrinsic safety evaluation.
There is researcher to carry out beneficial exploration for the non-explosivity intrinsic safety evaluation of some DC Switching Converters, also mentions
Go out some non-explosivity intrinsic safety evaluation methods, however the criterion proposed is relatively complicated, it is inconvenient for use and there is biggish office
It is sex-limited.
Therefore, it there is an urgent need to establish the non-explosive test evaluation system of intrinsic safe explosion-proof Switching Power Supply, designs corresponding to research and development
Computer evaluating apparatus have important theory significance and practical value.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that it is straight to provide a kind of hand-held
Current switching power supply exports intrinsic safety detector, and structure is simple, and novel in design rationally it is convenient to realize, detects high reliablity, display is straight
It sees, easy to operate, at low cost, applied widely, practical, using effect is good, convenient for promoting the use of.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of hand-held direct-current switch power supply output
Intrinsic safety detector, it is characterised in that: including micro controller module ,+5V power supply and+3.3V power circuit, the microcontroller mould
Block includes DSP digital signal processor and the crystal oscillating circuit and reset circuit that connect with DSP digital signal processor, described
The input of DSP digital signal processor is terminated with the button operation circuit for parameter setting, the DSP digital signal processor
Output be terminated with the liquid crystal display circuit for showing testing result, the DSP digital signal processor and button operation electricity
The output end of Lu Junyu+3.3V power circuit connects, and the liquid crystal display circuit is connect with the output end of+5V power supply, described+
The output of 3.3V power circuit, which is terminated with, powers on indicator light circuit.
Above-mentioned hand-held direct-current switch power supply exports intrinsic safety detector, it is characterised in that: the DSP Digital Signal Processing
Device is chip TMS320F28069PZT, VDDIO pin, VDD3FL pin and the VDD pipe of the chip TMS320F28069PZT
Foot connects with the output end of+3.3V power circuit, and the VDD pin of the chip TMS320F28069PZT also passes through nonpolarity
Capacitor C7 ground connection, the chip TMS320F28069PZT'sPin and VSS pin are grounded；The crystal oscillator electricity
Route crystal oscillator Y1, nonpolarity capacitor C5 and nonpolarity capacitor C6 composition, one end of the crystal oscillator Y1 and the one of nonpolar capacitor C5
End connects with the X1 pin of chip TMS320F28069PZT, one end of the other end of the crystal oscillator Y1 and nonpolar capacitor C6
Connect with the X2 pin of chip TMS320F28069PZT, the other end of the nonpolarity capacitor C5 is with nonpolar capacitor C6's
The other end is grounded；The reset circuit is made of reset key SW1, one end of the reset key SW1 and chip
TMS320F28069PZT'sPin connects, the other end ground connection of the reset key SW1.
Above-mentioned hand-held direct-current switch power supply exports intrinsic safety detector, it is characterised in that: the button operation circuit packet
Include key S1~S16, exclusion U5, and nonpolarity capacitor C8 and nonpolar capacitor C9；One end of the key S1, key S5
One end of one end, one end of key S12 and key S16 with the GPIO0/EPWM6A pin phase of chip TMS320F28069PZT
It connects, and connects with the 9th pin of exclusion U5；One end of the key S2, one end of key S6, one end of key S11 and key
One end of S15 connects with the GPIO0/EPWM5B pin of chip TMS320F28069PZT, and the 8th pin phase with exclusion U5
It connects；One end of the key S3, one end of key S7, one end of key S10 and key S14 one end and chip
The GPIO0/EPWM5A pin of TMS320F28069PZT connects, and connects with the 7th pin of exclusion U5；The one of the key S4
End, one end of key S8, one end of key S9 and key S13 GPIO0/ of the one end with chip TMS320F28069PZT
EPWM4B pin connects, and connects with the 6th pin of exclusion U5；The other end, the key of the other end of the key S1, key S2
The other end of S3 and the other end of key S4 connect with the GPIO0/EPWM3B pin of chip TMS320F28069PZT, and with
The 4th pin of exclusion U5 connects；The other end of the key S5, the other end of key S6, key S7 the other end and key S8
The other end connect with the GPIO0/EPWM3A pin of chip TMS320F28069PZT, and the 3rd pin phase with exclusion U5
It connects；The other end of the key S9, the other end of key S10, the other end of key S11 and key S12 the other end and core
The GPIO0/EPWM2B pin of piece TMS320F28069PZT connects, and connects with the 2nd pin of exclusion U5；The key S13's
The other end, the other end of key S14, the other end of key S15 and key S16 the other end and chip
The GPIO0/EPWM4A pin of TMS320F28069PZT connects, and connects with the 5th pin of exclusion U5；The 1st of the exclusion U5
Pin connects with the output end of+3.3V power circuit, and is grounded by nonpolar capacitor C8 and nonpolarity capacitor C9 in parallel.
Above-mentioned hand-held direct-current switch power supply exports intrinsic safety detector, it is characterised in that: the liquid crystal display circuit packet
Include the VDD pin of LCD12864 and slide rheostat RW1, the LCD12864, VCC pin andPin+5V power supply
Output end connect, the LCD12864'sPin also connects with a fixing end of slide rheostat RW1, described
The VO pin of LCD12864 connects with the sliding end of slide rheostat RW1, and another of the slide rheostat RW1 fixes termination
PSB pin and the VSS supervisor on ground, the LCD12864 are grounded, RS pin, R/W pin and the E pin of the LCD12864 according to
GPIO0/EPWM1A pin, GPIO0/EPWM1B pin and the GPIO0/EPWM2A of secondary correspondence and chip TMS320F28069PZT
Pin connects.
Above-mentioned hand-held direct-current switch power supply exports intrinsic safety detector, it is characterised in that:+5V the power supply is+5V lithium
The battery ,+3.3V power circuit include chip REG1117-3.3V, polar capacitor C1, nonpolar capacitor C2, polar capacitor C3
Connect with the 3rd pin of nonpolar capacitor C4, the chip REG1117-3.3V with the output end of+5V lithium battery, and by simultaneously
The polar capacitor C1 and nonpolarity capacitor C2 of connection are grounded, the 1st pin ground connection of the chip REG1117-3.3V, the chip
The 2nd pin of REG1117-3.3V and the 4th pin connect and are the output end of+3.3V the power circuit ,+3.3V power circuit
Output end pass through polar capacitor C3 and nonpolarity capacitor C4 ground connection in parallel.
Above-mentioned hand-held direct-current switch power supply exports intrinsic safety detector, it is characterised in that: described to power on indicator light circuit
Including resistance R1 and Light-emitting diode LED, the anode of the Light-emitting diode LED passes through resistance R1 and+3.3V power circuit
Output end connects, the minus earth of the Light-emitting diode LED.
The present invention also provides a kind of method and steps simply, it is convenient to realize, detects holding using above-mentioned for high reliablity
Formula direct-current switch power supply exports the method that intrinsic safety detector detects direct-current switch power supply output intrinsic safety, it is characterised in that should
Method the following steps are included:
Step 1: parameter inputs: passing through the performance parameter of operation button operation circuit input direct-current Switching Power Supply: described straight
The performance parameter of current switching power supply includes the output voltage U of direct-current switch power supply0, direct-current switch power supply output filter capacitor C
With the output maintenance voltage U of direct-current switch power supplyH, the DSP digital signal processor, which receives, passes through operation button operation circuit
The performance parameter of the direct-current switch power supply of input and storage；
Step 2: calculating minimum ignition energy WB, detailed process are as follows:
Step 201, the DSP digital signal processor are according to formula UB=KU0Minimum keep-alive voltage U is calculatedB；Its
In, K is safety coefficient；
Step 202, DSP digital signal processor inquiry light voltage curve previously according to simple condenser network minimum
The minimum being established and stored in DSP digital signal processor lights the mapping table of capacitor and minimum keep-alive voltage, obtains
With minimum keep-alive voltage UBCorresponding minimum lights capacitor CB；
Step 203, the DSP digital signal processor are according to formula WB=0.5CBU0 2It is calculated and lights electricity with minimum
Press UBCorresponding minimum ignition energy WB；
Step 3: calculating the spark energy W that direct-current switch power supply once dischargesΣ, detailed process are as follows:
Step 301, the DSP digital signal processor are according to formula TG=0.34U0+ 24.6+1.13 (C-16.8) is calculated
Obtain a discharge period T of direct-current switch power supplyG；
Step 302, the DSP digital signal processor are according to equation groupSolution obtains undetermined constant M and undetermined constant
N, wherein ε is the correction factor of discharge current and the value of ε is 10-3A, P are discharge spark voltage and P=M × 10-5/C(1+
N2), Q is the coefficient of displacement and Q=N-RC (1+N2)×105, R is the all-in resistance in the discharge loop of direct-current switch power supply；
Step 303, the DSP digital signal processor establish a discharge current i of direct-current switch power supplyGMathematical modulo
Type iG=Msin (105t)exp{-N×105T } and direct-current switch power supply a discharge voltage uGMathematical model uG=U0-P+P
[cos(105t)+Qsin(105t)]exp(-Nt×105)；Wherein, t is discharge time；
Step 304, the DSP digital signal processor are according to formulaTo the one of direct-current switch power supply
Secondary discharge current iGWith discharge voltage u of direct-current switch power supplyGIn a discharge period T of direct-current switch power supplyGIt is interior into
Row integral obtains the spark energy W that direct-current switch power supply once dischargesΣ；
Step 4: judging and showing that direct-current switch power supply exports intrinsic safety: the DSP digital signal processor is by dc switch
The spark energy W that power supply once dischargesΣWith minimum ignition energy WBIt is compared, works as WΣ≤WBWhen, it is judged as direct-current switch power supply
Output intrinsic safety is simultaneously shown by liquid crystal display circuit, otherwise, works as WΣ> WBWhen, it is judged as that direct-current switch power supply exports non-
Pacify and pass through liquid crystal display circuit and is shown.
Above-mentioned method, it is characterised in that: the value of K described in step 201 is 1.5.
Above-mentioned method, it is characterised in that: the value range of R described in step 302 is the Ω of 0.1 Ω~0.12.
Compared with the prior art, the present invention has the following advantages:
1, the circuit structure of hand-held direct-current switch power supply output intrinsic safety detector of the present invention is simple, novel in design reasonable,
It is convenient to realize.
2, detection high reliablity of the invention can fundamentally improve and improve the inspection of direct-current switch power supply intrinsic safe explosion-proof performance
The reliability of survey theoretically realizes the perfectly safe of its detection.
3, intuitive display of the invention, it is easy to operate, it is easy to use.
4, hand-held direct-current switch power supply of the present invention output intrinsic safety detector is small in size, light-weight, easy to carry, can be with
When direct-current switch power supply intrinsic safety performance is detected everywhere, the R&D cycle of intrinsic safety product can be shortened, reduce development cost.
5, of the invention applied widely, it can be used not only for the intrinsic safety of the nonlinear circuits such as detection direct-current switch power supply
It can, moreover it is possible to which the intrinsic safe explosion-proof performance of simple condenser network is detected.
6, cost of the invention is low, not as good as the one thousandth of IEC standard evaluating apparatus (safety spark experimental rig) cost.
7, of the invention practical, using effect is good, convenient for promoting the use of.
In conclusion novel design of the invention is rationally, it is convenient to realize, detects high reliablity, intuitive display, operation letter
Single, at low cost, applied widely, practical, using effect is good, convenient for promoting the use of.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is the schematic block circuit diagram that hand-held direct-current switch power supply of the present invention exports intrinsic safety detector.
Fig. 2 is the circuit diagram that hand-held direct-current switch power supply of the present invention exports intrinsic safety detector.
Fig. 3 is the method flow block diagram that direct-current switch power supply of the present invention exports intrinsic safety detection method.
Description of symbols:
1-micro controller module；1-1-DSP digital signal processor；1-2-crystal oscillating circuit；
1-3-reset circuit；2 -+5V power supply；3 -+3.3V power circuit；
4-button operation circuits；5-liquid crystal display circuits；6-power on indicator light circuit.
Specific embodiment
As shown in Figure 1, hand-held direct-current switch power supply output intrinsic safety detector of the invention, including micro controller module 1,
+ 5V power supply 2 and+3.3V power circuit 3, the micro controller module 1 include DSP digital signal processor 1-1 and with DSP number
The crystal oscillating circuit 1-2 and reset circuit 1-3 that word signal processor 1-1 connects, the input of the DSP digital signal processor 1-1
It is terminated with the button operation circuit 4 for parameter setting, the output of the DSP digital signal processor 1-1 is terminated with for showing
Show that the liquid crystal display circuit 5 of testing result, the DSP digital signal processor 1-1 and button operation circuit 4 are electric with+3.3V
The output end of source circuit 3 connects, and the liquid crystal display circuit 5 is connect with the output end of+5V power supply 2 ,+3.3V the power circuit
3 output, which is terminated with, powers on indicator light circuit 6.
As shown in Fig. 2, the DSP digital signal processor 1-1 is chip TMS320F28069PZT, institute in the present embodiment
State the output of the VDDIO pin, VDD3FL pin and VDD pin of chip TMS320F28069PZT with+3.3V power circuit 3
End connects, and the VDD pin of the chip TMS320F28069PZT also passes through nonpolar capacitor C7 ground connection, the chip
TMS320F28069PZT'sPin and VSS pin are grounded；The crystal oscillating circuit 1-2 is by crystal oscillator Y1, nonpolarity
Capacitor C5 and nonpolarity capacitor C6 are formed, and one end of one end of the crystal oscillator Y1 and nonpolarity capacitor C5 are and chip
The X1 pin of TMS320F28069PZT connects, and one end of the other end of the crystal oscillator Y1 and nonpolar capacitor C6 are and chip
The X2 pin of TMS320F28069PZT connects, and the other end of the other end of the nonpolarity capacitor C5 and nonpolar capacitor C6 are equal
Ground connection；The reset circuit 1-3 is made of reset key SW1, one end of the reset key SW1 and chip
TMS320F28069PZT'sPin connects, the other end ground connection of the reset key SW1.
As shown in Fig. 2, the button operation circuit 4 includes key S1~S16, exclusion U5 and non-pole in the present embodiment
Property capacitor C8 and nonpolar capacitor C9；One end of the key S1, one end of key S5, one end of key S12 and key S16
One end connects with the GPIO0/EPWM6A pin of chip TMS320F28069PZT, and connects with the 9th pin of exclusion U5；Institute
State one end of one end of key S2, one end of key S6, one end of key S11 and key S15 and chip
The GPIO0/EPWM5B pin of TMS320F28069PZT connects, and connects with the 8th pin of exclusion U5；The one of the key S3
End, one end of key S7, one end of key S10 and key S14 GPIO0/ of the one end with chip TMS320F28069PZT
EPWM5A pin connects, and connects with the 7th pin of exclusion U5；One end of the key S4, one end of key S8, key S9
One end and one end of key S13 connect with the GPIO0/EPWM4B pin of chip TMS320F28069PZT, and with exclusion U5's
6th pin connects；The other end of the key S1, the other end of key S2, the other end of key S3 and the other end of key S4
Connect with the GPIO0/EPWM3B pin of chip TMS320F28069PZT, and connects with the 4th pin of exclusion U5；It is described to press
The other end of key S5, the other end of key S6, the other end of key S7 and key S8 the other end and chip
The GPIO0/EPWM3A pin of TMS320F28069PZT connects, and connects with the 3rd pin of exclusion U5；The key S9's is another
One end, the other end of key S10, the other end of key S11 and key S12 the other end with chip TMS320F28069PZT
GPIO0/EPWM2B pin connect, and connect with the 2nd pin of exclusion U5；The other end of the key S13, key S14
GPIO0/EPWM4A of the other end of the other end, the other end of key S15 and key S16 with chip TMS320F28069PZT
Pin connects, and connects with the 5th pin of exclusion U5；The output end of the 1st pin and+3.3V power circuit 3 of the exclusion U5
Connect, and is grounded by nonpolar capacitor C8 and nonpolarity capacitor C9 in parallel.
As shown in Fig. 2, the liquid crystal display circuit 5 includes LCD12864 and slide rheostat RW1, institute in the present embodiment
State the VDD pin of LCD12864, VCC pin andThe output end of pin+5V power supply 2 connects, the LCD12864'sPin also connects with a fixing end of slide rheostat RW1, the VO pin and slide rheostat of the LCD12864
The sliding end of RW1 connects, another fixing end of slide rheostat RW1 ground connection, the PSB pin of the LCD12864 and
VSS supervisor is grounded, the RS pin of the LCD12864, R/W pin and E pin is corresponding in turn to and chip
GPIO0/EPWM1A pin, GPIO0/EPWM1B pin and the GPIO0/EPWM2A pin of TMS320F28069PZT connects.
As shown in Fig. 2,+5V the power supply 2 is+5V lithium battery in the present embodiment ,+3.3V the power circuit 3 includes core
Piece REG1117-3.3V, polar capacitor C1, nonpolar capacitor C2, polar capacitor C3 and nonpolar capacitor C4, the chip
The 3rd pin of REG1117-3.3V connects with the output end of+5V lithium battery, and passes through polar capacitor C1 and nonpolarity electricity in parallel
Hold C2 ground connection, the 1st pin ground connection of the chip REG1117-3.3V, the 2nd pin and the 4th of the chip REG1117-3.3V
Pin connects and is that the output end of+3.3V power circuit 3, the output end of+3.3V power circuit 3 pass through polarity electricity in parallel
Hold C3 and nonpolarity capacitor C4 to be grounded.
As shown in Fig. 2, the indicator light circuit 6 that powers on includes resistance R1 and Light-emitting diode LED, institute in the present embodiment
The anode for stating Light-emitting diode LED is connected by resistance R1 with the output end of+3.3V power circuit 3, the Light-emitting diode LED
Minus earth.
As shown in figure 3, of the invention open direct current using above-mentioned hand-held direct-current switch power supply output intrinsic safety detector
The method that powered-down source output intrinsic safety is detected, comprising the following steps:
Step 1: parameter inputs: passing through the performance parameter of 4 input direct-current Switching Power Supply of operation button operation circuit: described
The performance parameter of direct-current switch power supply includes the output voltage U of direct-current switch power supply0, direct-current switch power supply output filter capacitor
The output maintenance voltage U of C and direct-current switch power supplyH, the DSP digital signal processor 1-1 is received to be operated by operation button
Circuit 4 input direct-current switch power supply performance parameter and storage；
Step 2: calculating minimum ignition energy WB, detailed process are as follows:
Step 201, the DSP digital signal processor 1-1 are according to formula UB=KU0Minimum keep-alive voltage U is calculatedB；
Wherein, K is safety coefficient；
In the present embodiment, the value of K described in step 201 is 1.5.
Step 202, DSP digital signal processor 1-1 inquiry are previously according to simple condenser network minimum keep-alive voltage
The minimum that curve is established and stored in DSP digital signal processor 1-1 lights the corresponding relationship of capacitor and minimum keep-alive voltage
Table obtains and minimum keep-alive voltage UBCorresponding minimum lights capacitor CB；When it is implemented, being converged to China Compulsory national standard
It compiles the simple condenser network minimum that electrician's 5 standards of volume provide and lights voltage curve progress data regression, foundation is corresponding most
Small ignition capacitor and minimum light pressure mapping table, and it is stored in DSP digital signal in a manner of array or expression formula
In the memory of processor 1-1.
Step 203, the DSP digital signal processor 1-1 are according to formula WB=0.5CBU0 2It is calculated and is lighted with minimum
Voltage UBCorresponding minimum ignition energy WB；
Step 3: calculating the spark energy W that direct-current switch power supply once dischargesΣ, detailed process are as follows:
Step 301, the DSP digital signal processor 1-1 are according to formula TG=0.34U0+ 24.6+1.13 (C-16.8) meter
Calculation obtains a discharge period T of direct-current switch power supplyG；
Step 302, the DSP digital signal processor 1-1 are according to equation group
Solution obtains undetermined constant M and undetermined
Constant N, wherein ε is the correction factor of discharge current and the value of ε is 10-3A, P are discharge spark voltage and P=M × 10-5/C
(1+N2), Q is the coefficient of displacement and Q=N-RC (1+N2)×105, R is the all-in resistance in the discharge loop of direct-current switch power supply；
In the present embodiment, the value range of R described in step 302 is the Ω of 0.1 Ω~0.12.
Step 303, the DSP digital signal processor 1-1 establish a discharge current i of direct-current switch power supplyGNumber
Learn model iG=Msin (105t)exp{-N×105T } and direct-current switch power supply a discharge voltage uGMathematical model uG=
U0-P+P[cos(105t)+Qsin(105t)]exp(-Nt×105)；Wherein, t is discharge time；
Step 304, the DSP digital signal processor 1-1 are according to formulaTo direct-current switch power supply
Discharge current iGWith discharge voltage u of direct-current switch power supplyGIn a discharge period T of direct-current switch power supplyGIt is interior
It is integrated, obtains the spark energy W that direct-current switch power supply once dischargesΣ；
Step 4: judging and showing that direct-current switch power supply exports intrinsic safety: the DSP digital signal processor 1-1 is by direct current
The spark energy W that Switching Power Supply is once dischargedΣWith minimum ignition energy WBIt is compared, works as WΣ≤WBWhen, it is judged as dc switch
Power supply output intrinsic safety is simultaneously shown by liquid crystal display circuit 5, otherwise, works as WΣ> WBWhen, it is judged as that direct-current switch power supply is defeated
It non-intrinsic safety and is shown out by liquid crystal display circuit 5.It, will according to 5 regulation of China Compulsory national standard compilation electrician volume
The spark energy W of electric dischargeΣMinimum ignition energy W needed for explosive gas is lighted with condenser network under specific voltageBCompared
Compared with as judge condenser network whether meet output intrinsic safety requirements standard.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention
Technical spirit any simple modification to the above embodiments, change and equivalent structural changes, still fall within skill of the present invention
In the protection scope of art scheme.
Claims (8)
1. a kind of hand-held direct-current switch power supply exports intrinsic safety detection method, the detector used includes micro controller module
(1) ,+5V power supply (2) and+3.3V power circuit (3), the micro controller module (1) includes DSP digital signal processor (1-
1) crystal oscillating circuit (1-2) and reset circuit (1-3) and with DSP digital signal processor (1-1) to connect, the DSP number
The input of signal processor (1-1) is terminated with the button operation circuit (4) for parameter setting, the DSP Digital Signal Processing
The output of device (1-1) is terminated with the liquid crystal display circuit (5) for showing testing result, the DSP digital signal processor (1-
1) it is connect with the output end of+3.3V power circuit (3) with button operation circuit (4), the liquid crystal display circuit (5) and+5V
The output end of power supply (2) connects, and the output of+3.3V power circuit (3), which is terminated with, powers on indicator light circuit (6)；Its feature
It is, method includes the following steps:
Step 1: parameter inputs: passing through the performance parameter of operation button operation circuit (4) input direct-current Switching Power Supply: described straight
The performance parameter of current switching power supply includes the output voltage U of direct-current switch power supply0, direct-current switch power supply output filter capacitor C
With the output maintenance voltage U of direct-current switch power supplyH, the DSP digital signal processor (1-1) receives to be operated by operation button
Circuit (4) input direct-current switch power supply performance parameter and storage；
Step 2: calculating minimum ignition energy WB, detailed process are as follows:
Step 201, the DSP digital signal processor (1-1) are according to formula UB=KU0Minimum keep-alive voltage U is calculatedB；Its
In, K is safety coefficient；
Step 202, the DSP digital signal processor (1-1) inquiry are bent previously according to simple condenser network minimum keep-alive voltage
The minimum that line is established and stored in DSP digital signal processor (1-1) lights the corresponding relationship of capacitor and minimum keep-alive voltage
Table obtains and minimum keep-alive voltage UBCorresponding minimum lights capacitor CB；
Step 203, the DSP digital signal processor (1-1) are according to formula WB=0.5CBU0 2It is calculated and lights electricity with minimum
Press UBCorresponding minimum ignition energy WB；
Step 3: calculating the spark energy W that direct-current switch power supply once dischargesΣ, detailed process are as follows:
Step 301, the DSP digital signal processor (1-1) are according to formula TG=0.34U0+ 24.6+1.13 (C-16.8) is calculated
Obtain a discharge period T of direct-current switch power supplyG；
Step 302, the DSP digital signal processor (1-1) are according to equation groupSolution obtains undetermined constant M and undetermined constant
N, wherein ε is the correction factor of discharge current and the value of ε is 10-3A, P are discharge spark voltage and P=M × 10-5/C(1+
N2), Q is the coefficient of displacement and Q=N-RC (1+N2)×105, R is the all-in resistance in the discharge loop of direct-current switch power supply；
Step 303, the DSP digital signal processor (1-1) establish a discharge current i of direct-current switch power supplyGMathematical modulo
Type iG=Msin (105t)exp{-N×105T } and direct-current switch power supply a discharge voltage uGMathematical model uG=U0-P+P
[cos(105t)+Qsin(105t)]exp(-Nt×105)；Wherein, t is discharge time；
Step 304, the DSP digital signal processor (1-1) are according to formulaTo the one of direct-current switch power supply
Secondary discharge current iGWith discharge voltage u of direct-current switch power supplyGIn a discharge period T of direct-current switch power supplyGIt is interior into
Row integral obtains the spark energy W that direct-current switch power supply once dischargesΣ；
Step 4: judging and showing that direct-current switch power supply exports intrinsic safety: the DSP digital signal processor (1-1) opens direct current
The spark energy W that powered-down source is once dischargedΣWith minimum ignition energy WBIt is compared, works as WΣ≤WBWhen, it is judged as dc switch electricity
Source output intrinsic safety is simultaneously shown by liquid crystal display circuit (5), otherwise, works as WΣ> WBWhen, it is judged as that direct-current switch power supply is defeated
It non-intrinsic safety and is shown out by liquid crystal display circuit (5).
2. hand-held direct-current switch power supply described in accordance with the claim 1 exports intrinsic safety detection method, it is characterised in that: described
DSP digital signal processor (1-1) is chip TMS320F28069PZT, and the VDDIO of the chip TMS320F28069PZT is managed
Foot, VDD3FL pin and VDD pin connect with the output end of+3.3V power circuit (3), the chip
The VDD pin of TMS320F28069PZT also passes through nonpolar capacitor C7 ground connection, the chip TMS320F28069PZT'sPin and VSS pin are grounded；The crystal oscillating circuit (1-2) is by crystal oscillator Y1, nonpolarity capacitor C5 and nonpolarity
It is managed with the X1 of chip TMS320F28069PZT one end of capacitor C6 composition, one end of the crystal oscillator Y1 and nonpolar capacitor C5
Foot connects, one end of the other end of the crystal oscillator Y1 and nonpolar capacitor C6 with the X2 pin of chip TMS320F28069PZT
Connect, the other end of the other end of the nonpolarity capacitor C5 and nonpolar capacitor C6 are grounded；The reset circuit (1-3) by
Reset key SW1 composition, one end of the reset key SW1 is with chip TMS320F28069PZT'sPin connects, described
The other end of reset key SW1 is grounded.
3. hand-held direct-current switch power supply exports intrinsic safety detection method according to claim 2, it is characterised in that: described to press
Key operation circuit (4) includes key S1~S16, exclusion U5, and nonpolarity capacitor C8 and nonpolar capacitor C9；The key S1
One end, one end of key S5, one end of key S12 and key S16 one end with chip TMS320F28069PZT's
GPIO0/EPWM6A pin connects, and connects with the 9th pin of exclusion U5；One end of the key S2, key S6 one end, press
One end of key S11 and one end of key S15 connect with the GPIO0/EPWM5B pin of chip TMS320F28069PZT, and with
The 8th pin of exclusion U5 connects；One end of the key S3, one end of key S7, one end of key S10 and key S14 one
End connects with the GPIO0/EPWM5A pin of chip TMS320F28069PZT, and connects with the 7th pin of exclusion U5；It is described
One end of key S4, one end of key S8, one end of key S9 and key S13 one end with chip TMS320F28069PZT
GPIO0/EPWM4B pin connect, and connect with the 6th pin of exclusion U5；The other end of the key S1, key S2 it is another
The other end of one end, the other end of key S3 and key S4 with the GPIO0/EPWM3B pin of chip TMS320F28069PZT
Connect, and connects with the 4th pin of exclusion U5；The other end of the key S5, the other end of key S6, key S7 the other end
Connect with the GPIO0/EPWM3A pin of chip TMS320F28069PZT with the other end of key S8, and the with exclusion U5 the 3rd
Pin connects；The other end of the key S9, the other end of key S10, the other end of key S11 and the other end of key S12
Connect with the GPIO0/EPWM2B pin of chip TMS320F28069PZT, and connects with the 2nd pin of exclusion U5；It is described to press
The other end of key S13, the other end of key S14, the other end of key S15 and key S16 the other end and chip
The GPIO0/EPWM4A pin of TMS320F28069PZT connects, and connects with the 5th pin of exclusion U5；The 1st of the exclusion U5
Pin connects with the output end of+3.3V power circuit (3), and is connect by nonpolar capacitor C8 and nonpolarity capacitor C9 in parallel
Ground.
4. hand-held direct-current switch power supply exports intrinsic safety detection method according to claim 2, it is characterised in that: the liquid
Brilliant display circuit (5) include the VDD pin of LCD12864 and slide rheostat RW1, the LCD12864, VCC pin andThe output end of pin+5V power supply (2) connects, the LCD12864'sPin is also with slide rheostat RW1's
One fixing end connects, and the VO pin of the LCD12864 connects with the sliding end of slide rheostat RW1, the slide rheostat
Another fixing end of RW1 is grounded, and PSB pin and the VSS supervisor of the LCD12864 is grounded, the RS pipe of the LCD12864
Foot, R/W pin and E pin are corresponding in turn to GPIO0/EPWM1A pin, GPIO0/EPWM1B with chip TMS320F28069PZT
Pin and GPIO0/EPWM2A pin connect.
5. hand-held direct-current switch power supply described in accordance with the claim 1 exports intrinsic safety detection method, it is characterised in that: described+
5V power supply (2) is+5V lithium battery, and+3.3V the power circuit (3) includes chip REG1117-3.3V, polar capacitor C1, non-pole
Property capacitor C2, polar capacitor C3 and nonpolar capacitor C4, the chip REG1117-3.3V the 3rd pin and+5V lithium battery
Output end connects, and is grounded by polar capacitor C1 and nonpolarity capacitor C2 in parallel, the 1st of the chip REG1117-3.3V the
Pin ground connection, the 2nd pin and the 4th pin of the chip REG1117-3.3V connect and are the output of+3.3V power circuit (3)
The output end at the end ,+3.3V power circuit (3) is grounded by polar capacitor C3 and nonpolarity capacitor C4 in parallel.
6. hand-held direct-current switch power supply described in accordance with the claim 1 exports intrinsic safety detection method, it is characterised in that: on described
Electric indicator light circuit (6) includes resistance R1 and Light-emitting diode LED, the anode of the Light-emitting diode LED by resistance R1 with+
The output end of 3.3V power circuit (3) connects, the minus earth of the Light-emitting diode LED.
7. hand-held direct-current switch power supply described in accordance with the claim 1 exports intrinsic safety detection method, it is characterised in that: step
The value of K described in 201 is 1.5.
8. hand-held direct-current switch power supply described in accordance with the claim 1 exports intrinsic safety detection method, it is characterised in that: step
The value range of R described in 302 is the Ω of 0.1 Ω~0.12.
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| CN106443499A (en) | 2017-02-22 |
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