CN106054016A - Method for judging short circuit fault of inverter - Google Patents
Method for judging short circuit fault of inverter Download PDFInfo
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- CN106054016A CN106054016A CN201610678448.8A CN201610678448A CN106054016A CN 106054016 A CN106054016 A CN 106054016A CN 201610678448 A CN201610678448 A CN 201610678448A CN 106054016 A CN106054016 A CN 106054016A
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- inverter
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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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
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Abstract
The invention discloses a method for judging a short circuit fault of an inverter, and the method comprises a step: judging whether the short circuit fault happens or not when the inverter is in a normal working state. The step comprises the following substeps: b1, enabling a current detection circuit to detect a working current of the inverter in real time, and enabling a working current detection result to be transmitted to a controller of the inverter; b2, enabling the controller to instantly control the inverter to stop the outputting if the detection result of the working current is greater than or equal to a current threshold value, restarting the inverter, controlling the inverter to output an alternating current again after a preset first time from the moment when the output of the inverter is stopped, and returning to step b1; b3, judging that the short circuit fault happens to the circuit breaker if the number of times that the controller repeatedly executes the step b2 is greater than or equal to a preset threshold value of the number of times; or else, judging that the detection result of the working current generated by an impact load is greater than or equal to the current threshold value. The method can judge whether the inverter has the short circuit fault or not accurately and quickly when the inverter is in the normal working state.
Description
Technical field
The present invention relates to the determination methods of inverter short circuit fault.
Background technology
The speed of vehicle-mounted inverter short-circuit protection is the fastest, and safety will be the highest, the least to hardware device damage.Short circuit is protected
Protect the difficult point of technology and be easily will to connect what impact load (connecing power supply adaptor or the lowest bulb etc. of temperature as dashed forward) caused
Big electric current and real short circuit current get mixed up, to such an extent as to do the judgement made mistake.Carry at the in running order band of inverter
During cold bulb, the state of powered on moment is essentially identical with the state of short circuit, it is thus possible to can erroneous judgement be short-circuit protection.In order to
Both can guarantee that when inverter is in running order inverter when short circuit with the fastest speed protection, also want can distinguish cold lamp
Band carries, the most general following two control method that uses:
First method is delayed short-circuit protection.The method can avoid inverter to carry out the short of mistake when band refrigerating lamp load
Road protection act, but when real short circuit, simple delayed short-circuit protection can cause the biggest electric current, to people and hardware
Equipment can cause damage；
Second method is to gather the output electric current of inverter with the analog to digital conversion circuit within single-chip microcomputer, directly carries out short circuit guarantor
Protect.This method may make inverter also make the action of short-circuit protection when band refrigerating lamp load, thus reduces inverter
The stability of work.
Additionally, above-mentioned two kinds of methods all can be only applied to inverter and complete to start the situation being in normal operating conditions,
When inverter is in starting state, even if inverter has occurred and that short circuit also will not produce big operating current, use above-mentioned
Two kinds of methods all cannot detect whether inverter there occurs short trouble.
Summary of the invention
The technical problem to be solved is to provide the determination methods of a kind of inverter short circuit fault, and it can be
Inverter completes to judge whether inverter there occurs short trouble quickly and accurately when startup is in normal operating conditions.
Further technical problem to be solved by this invention is to provide the determination methods of a kind of inverter short circuit fault,
It can also judge whether inverter there occurs short trouble when starting state.
For solving above-mentioned technical problem, the embodiment of the present invention provides the determination methods of a kind of inverter short circuit fault, including
The fault that completes inverter whether to be short-circuited when startup is in normal operating conditions judges, described completes inverter
Start the fault that whether is short-circuited when being in normal operating conditions to carry out judgement and comprise the following steps:
Step b1, current detection circuit detect the operating current of inverter in real time, and are sent to inverse by operating current testing result
Becoming the controller of device, the operating current testing result of inverter is compared by controller with the current threshold preset；
If step b2 operating current testing result is more than or equal to current threshold, then controller controls inverter immediately and stops defeated
Go out, restart inverter, and when inverter stops output after the default very first time, control inverter again
Secondary output AC electricity, is then back to step b1；
Step b3, controller are added up, if controller continuously repeats performs step continuously repeating the number of times performing step b2
The number of times of rapid b2 more than or equal to the frequency threshold value preset, then judges that inverter is short-circuited, if controller continuously repeats execution
The number of times of step b2 is less than frequency threshold value, then judge it is to be caused operating current testing result more than or equal to electric current by impact load
Threshold value.
Further, the determination methods of this inverter short circuit fault also includes whether sending out when inverter is in starting state
Raw short trouble judges, the judgement of the described fault that whether is short-circuited when inverter is in starting state includes following
Step:
Step a1, voltage detecting circuit when inverter has just started output AC electricity, gather every default second time
The instantaneous value of inverter output voltage, continuous acquisition n times, and the instantaneous value of the inverter output voltage collected is sent out
Give controller；Wherein, the instantaneous value of the inverter output voltage of n-th collection is the sine wave AC voltage of inverter output
Signal is through the instantaneous voltage corresponding to the moment in 1/4th cycles or is positioned at the sine wave AC that inverter exports
Instantaneous voltage between 1/4th cycles and 1/2nd cycles of voltage signal；
Step a2, controller by cumulative for the instantaneous value of n times inverter output voltage summation, the most cumulative summed result with preset
Summation threshold value, if cumulative summed result is more than or equal to summation threshold value, then judges that inverter is not short-circuited fault, if tired out
Add summed result less than summation threshold value, then judge that inverter has been short-circuited when starting state fault.
The present invention is at least up to one of following beneficial effect:
1, the inverter short circuit fault judgment method of the embodiment of the present invention had both avoided when inverter is connected with impact load
Erroneous judgement is the problem of short-circuit protection, also can quickly determine that short trouble simultaneously such that it is able to running into real short circuit
In the case of the output of fast shut-off inverter, it is ensured that people and the safety of hardware device；
2, the inverter short circuit fault judgment method of the embodiment of the present invention is in normal operating conditions at inverter or starts shape
The situation of short trouble can be quickly determined that during state, thus drastically increase the safety in utilization of inverter product；
3, the judgement processing procedure of the present invention relies primarily on controller realization, and the hardware quantity used is little, thus implements into
This is relatively low.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in embodiment being described below required for make
Accompanying drawing briefly introduce, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention, for this
From the point of view of the those of ordinary skill in field, on the premise of not paying creative work, it is also possible to obtain it according to these accompanying drawings
His accompanying drawing.
Fig. 1 is the schematic flow sheet of the determination methods of inverter short circuit fault according to an embodiment of the invention, wherein shows
It has when inverter is in normal operating conditions the step that the fault that whether is short-circuited judges.
Fig. 2 is the schematic flow sheet of the determination methods of inverter short circuit fault according to an embodiment of the invention, Qi Zhongjin
Whether one step is short-circuited when showing and inverter is in starting state the step that fault judges.
Fig. 3 shows the waveform signal of inverter output voltage and the operating current measured according to the present invention one application example
Figure, wherein, inverter is in starting state, and has short trouble.
Fig. 4 shows the waveform signal of inverter output voltage and the operating current measured according to the present invention one application example
Figure, wherein, inverter is in starting state, and be not short-circuited fault.
Fig. 5 shows the waveform signal of inverter output voltage and the operating current measured according to the present invention one application example
Figure, wherein, inverter is in normal operating conditions, and has short trouble.
Fig. 6 shows the waveform signal of inverter output voltage and the operating current measured according to the present invention one application example
Figure, wherein, inverter is in normal operating conditions, and has accessed cold bulb.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is made and further illustrating.
Fig. 1 shows the schematic flow sheet of the determination methods of inverter short circuit fault according to an embodiment of the invention.Please
With reference to Fig. 1, the according to an embodiment of the invention determination methods of inverter short circuit fault, it is in including inverter is completed startup
The fault that whether is short-circuited during normal operating conditions judges, described inverter is completed startup be in normal operating conditions
Time the fault that whether is short-circuited carry out judgement and comprise the following steps:
Step b1, current detection circuit detect the operating current of inverter in real time, and are sent to inverse by operating current testing result
Becoming the controller of device, the operating current testing result of inverter is compared by controller with the current threshold preset；
If step b2 operating current testing result is more than or equal to current threshold, then controller controls inverter immediately and stops defeated
Go out, restart inverter, and when inverter stops output after the default very first time, control inverter again
Secondary output AC electricity, is then back to step b1；
Step b3, controller are added up, if controller continuously repeats performs step continuously repeating the number of times performing step b2
The number of times of rapid b2 more than or equal to the frequency threshold value preset, then judges that inverter is short-circuited, if controller continuously repeats execution
The number of times of step b2 is less than described frequency threshold value, then judge it is to be caused operating current testing result to be more than or equal to by impact load
Current threshold.
In the present embodiment, the span of the above-mentioned very first time is 1ms ~ 1.4ms.The span of above-mentioned frequency threshold value
It it is 5 ~ 7 times.
Further, as in figure 2 it is shown, according to an embodiment of the invention the determination methods of inverter short circuit fault also include
The fault that whether is short-circuited when inverter is in starting state before normal work judges, described is in inverter
The judgement of the fault that whether is short-circuited during starting state comprises the following steps:
Step a1, voltage detecting circuit when inverter has just started output AC electricity, gather every default second time
The instantaneous value of inverter output voltage, continuous acquisition n times, and the instantaneous value of the inverter output voltage collected is sent out
Give controller；Wherein, the instantaneous value of the inverter output voltage of n-th collection is the sine wave AC voltage of inverter output
Signal is through the instantaneous voltage corresponding to the moment in 1/4th cycles or is positioned at the sine wave AC that inverter exports
Instantaneous voltage between 1/4th cycles and 1/2nd cycles of voltage signal；Preferably, 15 ＜ N ＜ 40；
Step a2, controller by cumulative for the instantaneous value of n times inverter output voltage summation, the most cumulative summed result with preset
Summation threshold value, if cumulative summed result is more than or equal to described summation threshold value, then judges that inverter is not short-circuited fault, as
The cumulative summed result of fruit less than described summation threshold value, then judges that inverter has been short-circuited when starting state fault.
Below in conjunction with concrete application example, the work process of the inventive method is done more detailed explanation.
In the application example that this is concrete, inverter is the vehicle-mounted inverter meeting Unite States Standard, and its mode started is
Soft start, input direct voltage is in the range of 7 ~ 16V, and the virtual value of output AC voltage is 115V, and frequency is 60Hz.Inverter
Controller be 8 Infineon's XC836 single-chip microcomputers.
In this application example, when, after inverter electrifying startup, voltage detecting circuit has just started output AC from inverter
Rise when electricity, gather the instantaneous value of an output voltage, continuous acquisition every 188us (the second time i.e. preset is 188us)
22 times (i.e. N is equal to 22), the instantaneous value of the inverter output voltage that the 22nd time gathers is the sine wave alternating current of inverter output
Pressure signal is through the voltage wave peak value corresponding to the moment in 1/4th cycles, and by the inverter output voltage that collects
Instantaneous value is sent to the controller of inverter.
Controller is by cumulative for the instantaneous value of 22 inverter output voltages summation, the most cumulative summed result and asking of presetting
Size with threshold value 150.Here summation threshold value 150 is after the output voltage for inverter carries out dividing potential drop, digital sample
Set by digital quantity, its size is relevant with the kind of inverter, performance etc..In more specifically embodiment, intrinsic standoff ratio can
It is set to 0.012 ~ 0.016, the inverter output voltage after dividing potential drop is overlapped with 2.5V DC voltage, then counts
Word is sampled, and sampling precision is 10, and the span of summation threshold value is 140 ~ 160.
If cumulative summed result is less than summation threshold values 150, then single-chip microcomputer judges that inverter occurs when starting state
Short trouble, and it is immediately performed short-circuit protection, close DC supply input and the alternating voltage output of inverter；Ask if cumulative
With result more than summation threshold values 150, then single-chip microcomputer judges that inverter is not short-circuited when starting state fault, and then exports
Specified alternating current, starts normal work.
Fig. 3 and Fig. 4 respectively illustrates the waveform of output voltage V when inverter is in starting state and operating current I and shows
Being intended to, Fig. 3 is shown that inverter and there occurs the situation of short trouble, and Fig. 4 is shown that not being short-circuited fault
Situation.Operating current I namely the bus current of inverter.From figs. 3 and 4 it can be seen that owing to inverter is in starting state,
Therefore the operating current I of inverter is the least, it is impossible to whether creates overcurrent by detection inverter and judges to there occurs inverse
Become device short trouble or inverter band refrigerating lamp (i.e. having accessed cold bulb).Inverter has just started the moment pair of output AC electricity
Answer is the S point in Fig. 3 and Fig. 4, and inverter the 22nd time gather moment of inverter output voltage instantaneous value corresponding be figure
E point in 3 and Fig. 4, the maximum in first cycle of the sine wave AC voltage that E point exports for inverter, in Fig. 2 and Fig. 3
For crest value, it is possible to be valley value.In figure 3, owing to inverter there occurs short trouble, the therefore output voltage V of inverter
The least, maximum output voltage only has 1.5V, and the cumulative summing value of voltage is again smaller than the summation threshold values 150 set.And at Fig. 4
In, inverter is not short-circuited fault, and therefore the output voltage V of inverter is very big, the maximum output voltage value at E point
Reaching 30.19V, the cumulative summing value of inverter output voltage is more than the threshold values 150 set.
In this application example, when inverter complete startup be in normal operating conditions time, current detection circuit is examined in real time
Surveying the operating current of inverter, and operating current testing result is sent to single-chip microcomputer, single-chip microcomputer is by the operating current of inverter
Testing result compares with the current threshold preset.Current detection circuit is realized by bleeder circuit, operating current detection knot
Fruit and current threshold are all the magnitudes of voltage being directly proportional to electric current.Inverter complete startup be in normal operating conditions time, no matter
It is inverter short circuit or band refrigerating lamp, all can produce the big electric current of moment, therefore be compared the work of inverter by single-chip microcomputer
Whether current detecting result and the size of default current threshold, it is known that there occurs inverter short circuit or band refrigerating lamp.
Produce big electric current duration in the case of inverter short circuit and be about 600us, big electricity in the case of inverter band refrigerating lamp
Stream duration is about 950us.
Single-chip microcomputer is more than current threshold through comparing discovery operating current testing result, then single-chip microcomputer controls inverter immediately
Stop output, restart inverter, and when inverter stops output very first time of i.e. presetting through 1.2ms()
After, control inverter output AC again electricity.After inverter again output AC electricity, if what current detection circuit detected
Inverter operating current is again more than current threshold, then single-chip microcomputer repeats above action (what namely second time performed above is dynamic
Make), control inverter the most immediately and stop output, restart inverter, and when inverter stops output through
After 1.2ms, control inverter output AC again electricity.
If the number of times that single-chip microcomputer continuously repeats such action has met or exceeded 5 times as frequency threshold value, then single
Sheet machine judges that now inverter is in short-circuit condition, and then carries out short-circuit protection, close it power supply direct current input with exchange defeated
Go out.If the number of times that single-chip microcomputer continuously repeats such action is less than 5 times, the most only 2 times, again open in inverter third time
Dynamic, again after output AC electricity, the inverter operating current that current detection circuit detects is less than current threshold, then single-chip microcomputer
Judge that inverter is to be caused operating current testing result to be more than or equal to current threshold by impact load, thus be not carried out short circuit
Protection, inverter normally works.
Fig. 5 and Fig. 6 respectively illustrates the waveform diagram of operating current I when inverter is in normal operating conditions, Fig. 5
It is shown that inverter and there occurs the situation of short trouble, and Fig. 6 is shown that inverter band refrigerating lamp, is not short-circuited
The situation of fault.
The inverter short circuit fault judgment method of the embodiment of the present invention had both avoided and had been connected with impact load at inverter
Mistiming is judged as the problem of short-circuit protection, also can quickly determine that short trouble such that it is able to running into real short circuit simultaneously
In the case of the output of fast shut-off inverter, it is ensured that people and the safety of hardware device.
Obviously, those skilled in the art can carry out various change and the modification essence without deviating from the present invention to the present invention
God and scope.So, if these amendments of the present invention and modification belong to the scope of the claims in the present invention and equivalent technologies thereof
Within, then the present invention is also intended to comprise these change and modification.
Claims (7)
1. the determination methods of an inverter short circuit fault, it is characterised in that include that inverter completes startup is in normal work
Whether the fault that whether is short-circuited when making state judges, described complete inverter when startup is in normal operating conditions
The fault that is short-circuited carries out judgement and comprises the following steps:
Step b1, current detection circuit detect the operating current of inverter in real time, and operating current testing result is sent to institute
Stating the controller of inverter, the operating current testing result of inverter is compared by described controller with default current threshold
Relatively；
If step b2 described operating current testing result is more than or equal to described current threshold, then controller controls inversion immediately
Device stops output, restarts inverter, and when inverter stops output after the default very first time, control
Inverter output AC again electricity, is then back to step b1；
Step b3, controller are added up, if controller continuously repeats performs step continuously repeating the number of times performing step b2
The number of times of rapid b2 more than or equal to the frequency threshold value preset, then judges that inverter is short-circuited, if controller continuously repeats execution
The number of times of step b2 is less than described frequency threshold value, then judge it is to be caused described operating current testing result to be more than by impact load
Equal to described current threshold.
2. the determination methods of inverter short circuit fault as claimed in claim 1, it is characterised in that the controller of described inverter
It is made up of single-chip microcomputer；
In described step b2, if described operating current testing result is more than or equal to described current threshold, the most described monolithic
Machine controls inverter immediately and stops output, restarts inverter, and also removes all of flag bit.
3. the determination methods of inverter short circuit fault as claimed in claim 1, it is characterised in that the value of the described very first time
Scope is 1ms ~ 1.4ms.
4. the determination methods of inverter short circuit fault as claimed in claim 1, it is characterised in that the value of described frequency threshold value
Scope is 5 ~ 7 times.
5. the determination methods of inverter short circuit fault as claimed in claim 1, it is characterised in that include inverter is in opening
The fault that whether is short-circuited during dynamic state judges, the described fault that whether is short-circuited when inverter is in starting state
Judgement comprise the following steps:
Step a1, voltage detecting circuit when inverter has just started output AC electricity, gather every default second time
The instantaneous value of inverter output voltage, continuous acquisition n times, and the instantaneous value of the inverter output voltage collected is sent out
Give described controller；Wherein, the instantaneous value of the inverter output voltage of n-th collection is the sine wave AC of inverter output
Voltage signal is through the instantaneous voltage corresponding to the moment in 1/4th cycles or is positioned at the sine wave that inverter exports
Instantaneous voltage between 1/4th cycles and 1/2nd cycles of ac voltage signal；
Step a2, described controller are by cumulative for the instantaneous value of n times inverter output voltage summation, and the most cumulative summed result is with pre-
If summation threshold value, if cumulative summed result is more than or equal to described summation threshold value, then judge that inverter is not short-circuited former
Barrier, if cumulative summed result is less than described summation threshold value, then judges that inverter has been short-circuited when starting state fault.
6. the determination methods of inverter short circuit fault as claimed in claim 5, it is characterised in that 15 ＜ N ＜ 40.
7. the determination methods of inverter short circuit fault as claimed in claim 1, it is characterised in that described inverter is vehicle-mounted inverse
Become device.
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| CN201610678448.8A CN106054016B (en) | 2016-08-17 | 2016-08-17 | The judgment method of inverter short circuit failure |
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| CN111371073A (en) * | 2020-04-29 | 2020-07-03 | 深圳创维－Rgb电子有限公司 | Output short-circuit protection circuit and protection control method thereof |
| CN113162455A (en) * | 2021-03-11 | 2021-07-23 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Power supply conversion device and short-circuit protection method thereof |
| CN113629665A (en) * | 2021-09-02 | 2021-11-09 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Three-phase inverter power supply short circuit self-recovery method |
| CN114167970A (en) * | 2021-12-09 | 2022-03-11 | 深圳市海浦蒙特科技有限公司 | An overcurrent protection method and related components |
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| CN113162455B (en) * | 2021-03-11 | 2022-08-23 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Power supply conversion device and short-circuit protection method thereof |
| CN113629665A (en) * | 2021-09-02 | 2021-11-09 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Three-phase inverter power supply short circuit self-recovery method |
| CN113629665B (en) * | 2021-09-02 | 2024-08-09 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Short-circuit self-recovery method for three-phase inverter power supply |
| CN114167970A (en) * | 2021-12-09 | 2022-03-11 | 深圳市海浦蒙特科技有限公司 | An overcurrent protection method and related components |
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