CN106054016B - The judgment method of inverter short circuit failure - Google Patents
The judgment method of inverter short circuit failure Download PDFInfo
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- CN106054016B CN106054016B CN201610678448.8A CN201610678448A CN106054016B CN 106054016 B CN106054016 B CN 106054016B CN 201610678448 A CN201610678448 A CN 201610678448A CN 106054016 B CN106054016 B CN 106054016B
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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 judgment method of inverter short circuit failure, short trouble whether occurs when including being in normal operating conditions to inverter to judge, it the steps include: the operating current of step b1, current detection circuit real-time detection inverter, and operating current testing result be sent to the controller of inverter；Step b2, such as operating current testing result is more than or equal to current threshold, then controller be immediately controlled inverter stop output, restart inverter, and from inverter stop output from after preset first time, control inverter exports alternating current again, then return step b1；Step b3, such as controller continuously repeats the number for executing step b2 more than or equal to preset frequency threshold value, then judges that short circuit, such as less than frequency threshold value occur for inverter, then judgement is to cause operating current testing result more than or equal to current threshold by impact load.The present invention can quickly and accurately judge whether it has occurred short trouble when inverter is in normal operating conditions.
Description
Technical field
The present invention relates to the judgment methods of inverter short circuit failure.
Background technique
The speed of vehicle-mounted inverter short-circuit protection is faster, and safety will be higher, damages to hardware device smaller.Short circuit is protected
The difficult point of shield technology is caused by being easy to connect impact load (such as prominent to connect the very low light bulb of power supply adaptor or temperature)
High current and real short circuit current are got mixed up, so that doing the judgement to make mistake.It is carried in the in running order band of inverter
When cold light bulb, the state of powered on moment and the state of short circuit are essentially identical, it is thus possible to can erroneous judgement be short-circuit protection.In order to
It both can guarantee that inverter, with most fast speed protection, also wanted that cold lamp can be distinguished in short circuit when inverter is in running order
Band carries, and generally uses following two control method at present:
First method is lag short-circuit protection.This method can carry out mistake in band refrigerating lamp load to avoid inverter
Short-circuit protection movement, but it is real short circuit when, simple lag short-circuit protection will cause prolonged high current, to people with
Hardware device will cause damage；
Second method is the output electric current that inverter is acquired with the analog to digital conversion circuit inside single-chip microcontroller, is directly carried out short
Road protection.This method may make inverter also make the movement of short-circuit protection when with refrigerating lamp load, to reduce inverse
Become the stability of the work of device.
In addition, above-mentioned two methods, which can be only applied to inverter, completes the case where starting is in normal operating conditions,
When inverter is in starting state, big operating current will not be generated inverter has occurred and that short circuit, use is above-mentioned
Two methods can not detect whether inverter has occurred short trouble.
Summary of the invention
It, can be technical problem to be solved by the present invention lies in providing a kind of judgment method of inverter short circuit failure
Inverter quickly and accurately judges whether inverter has occurred short trouble when completing starting in normal operating conditions.
Further technical problem to be solved by this invention is to provide a kind of judgment method of inverter short circuit failure,
It can also judge whether inverter has occurred short trouble in starting state.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of judgment method of inverter short circuit failure, including
Short trouble whether occurs when completing starting in normal operating conditions to inverter to judge, it is described that inverter is completed
Whether occur when starting is in normal operating conditions short trouble judged the following steps are included:
Step b1, the operating current of current detection circuit real-time detection inverter, and operating current testing result is sent
To the controller of inverter, the operating current testing result of inverter is compared by controller with preset current threshold；
If step b2, operating current testing result is more than or equal to current threshold, controller is immediately controlled inverter and stops
Only export, restart inverter, and from inverter stop output from after preset first time, control inversion
Device exports alternating current again, then return step b1；
Step b3, controller is counted to the number for executing step b2 is continuously repeated, and is held if controller continuously repeats
The number of row step b2 is more than or equal to preset frequency threshold value, then judges that short circuit occurs for inverter, if controller continuously repeats
The number for executing step b2 is less than frequency threshold value, then judgement is to cause operating current testing result to be more than or equal to by impact load
Current threshold.
Further, whether the judgment method of the inverter short circuit failure further includes sending out when being in starting state to inverter
Raw short trouble judged, described the judgement of short trouble whether occurs when being in starting state to inverter includes following
Step:
Step a1, from voltage detecting circuit exports alternating current since inverter is just, every preset second time
Acquire the instantaneous value of an inverter output voltage, continuous acquisition n times, and by the instantaneous of collected inverter output voltage
Value is sent to controller；Wherein, the instantaneous value of the inverter output voltage of n-th acquisition is the sine wave AC of inverter output
Voltage signal instantaneous voltage corresponding at the time of passing through a quarter period is either located at the sine wave of inverter output
Instantaneous voltage between a quarter period and half period of ac voltage signal；
Step a2, controller is by the cumulative summation of the instantaneous value of n times inverter output voltage, relatively more cumulative summed result and pre-
If summation threshold value, if cumulative summed result is more than or equal to summation threshold value, judging inverter, there is no short troubles, such as
Fruit adds up summed result less than summation threshold value, then judges that in starting state short trouble has occurred for inverter.
The present invention is at least up to one of beneficial effect below:
1, the inverter short circuit fault judgment method of the embodiment of the present invention had both been avoided connects in inverter and impact load
The problem of erroneous judgement is short-circuit protection when connecing, while can also quickly determine that short trouble, so as to encounter it is really short
The output of inverter is quickly cut off in the case where road, it is ensured that the safety of people and hardware device；
2, the inverter short circuit fault judgment method of the embodiment of the present invention is in normal operating conditions in inverter or opens
The case where can quickly determining that short trouble when dynamic state, thus greatly improve inverter product using safe
Property；
3, judgement treatment process of the invention relies primarily on controller realization, and used hardware quantity is seldom, thus real
Apply that cost is relatively low.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without any creative labor, it can also be obtained according to these attached drawings
His attached drawing.
Fig. 1 is the flow diagram of the judgment method of inverter short circuit failure according to an embodiment of the invention, wherein showing
Go out and whether the step of short trouble judges has occurred when being in normal operating conditions to inverter.
Fig. 2 is the flow diagram of the judgment method of inverter short circuit failure according to an embodiment of the invention, wherein into
One step shows whether the step of short trouble judges occurs when being in starting state to inverter.
Fig. 3 shows the waveform signal of an application example is measured according to the present invention inverter output voltage and operating current
Figure, wherein inverter is in starting state, and has short trouble.
Fig. 4 shows the waveform signal of an application example is measured according to the present invention inverter output voltage and operating current
Figure, wherein inverter is in starting state, and there is no short trouble occurs.
Fig. 5 shows the waveform signal of an application example is measured according to the present invention inverter output voltage and operating current
Figure, wherein inverter is in normal operating conditions, and has short trouble.
Fig. 6 shows the waveform signal of an application example is measured according to the present invention inverter output voltage and operating current
Figure, wherein inverter is in normal operating conditions, and has accessed cold light bulb.
Specific embodiment
Further explanation is made to the present invention with reference to the accompanying drawing.
Fig. 1 shows the flow diagram of the judgment method of inverter short circuit failure according to an embodiment of the invention.Please
With reference to Fig. 1, the judgment method of inverter short circuit failure according to an embodiment of the invention, including starting is completed to inverter and is in
Short trouble whether occurs when normal operating conditions to be judged, it is described that starting is completed in normal operating conditions to inverter
When whether occur short trouble judged the following steps are included:
Step b1, the operating current of current detection circuit real-time detection inverter, and operating current testing result is sent
To the controller of inverter, the operating current testing result of inverter is compared by controller with preset current threshold；
If step b2, operating current testing result is more than or equal to current threshold, controller is immediately controlled inverter and stops
Only export, restart inverter, and from inverter stop output from after preset first time, control inversion
Device exports alternating current again, then return step b1；
Step b3, controller is counted to the number for executing step b2 is continuously repeated, and is held if controller continuously repeats
The number of row step b2 is more than or equal to preset frequency threshold value, then judges that short circuit occurs for inverter, if controller continuously repeats
The number for executing step b2 is less than the frequency threshold value, then judgement is to cause operating current testing result to be greater than by impact load
Equal to current threshold.
In the present embodiment, the value range of above-mentioned first time is 1ms ~ 1.4ms.The value range of above-mentioned frequency threshold value
It is 5 ~ 7 times.
Further, as shown in Fig. 2, the judgment method of inverter short circuit failure according to an embodiment of the invention further includes
Short trouble whether occurs when being in inverter before normal work starting state to judge, it is described that inverter is in
The judgement of short trouble whether occurs when starting state the following steps are included:
Step a1, from voltage detecting circuit exports alternating current since inverter is just, every preset second time
Acquire the instantaneous value of an inverter output voltage, continuous acquisition n times, and by the instantaneous of collected inverter output voltage
Value is sent to controller；Wherein, the instantaneous value of the inverter output voltage of n-th acquisition is the sine wave AC of inverter output
Voltage signal instantaneous voltage corresponding at the time of passing through a quarter period is either located at the sine wave of inverter output
Instantaneous voltage between a quarter period and half period of ac voltage signal；Preferably, 15 < N < 40；
Step a2, controller is by the cumulative summation of the instantaneous value of n times inverter output voltage, relatively more cumulative summed result and pre-
If summation threshold value, if cumulative summed result is more than or equal to the summation threshold value, judge inverter there is no short-circuit therefore
Barrier judges that in starting state short trouble has occurred for inverter if cumulative summed result is less than the summation threshold value.
More detailed explanation is done below in conjunction with the course of work of the specific application example to the method for the present invention.
In the specific application example, inverter is the vehicle-mounted inverter for meeting Unite States Standard, and the mode of starting is
Soft start, the range of input direct-current voltage are 7 ~ 16V, and the virtual value of output AC voltage is 115V, frequency 60Hz.Inverter
Controller be 8 Infineon's XC836 single-chip microcontrollers.
In the application example, after inverter electrifying startup, voltage detecting circuit exports exchange since inverter is just
From electricity, every the instantaneous value of 188us (i.e. preset second time is a 188us) output voltage of acquisition, continuous acquisition
22 times (i.e. N is equal to 22), the instantaneous value of the inverter output voltage of the 22nd acquisition is the sine wave alternating current of inverter output
Corresponding voltage crest value at the time of pressing signal to pass through a quarter period, and by collected inverter output voltage
Instantaneous value is sent to the controller of inverter.
Controller asks the cumulative summation of the instantaneous value of 22 inverter output voltages, relatively more cumulative summed result with preset
With the size of threshold value 150.Here summation threshold value 150 is divided, after digital sample for the output voltage of inverter
Set by digital quantity, type, performance of size and inverter etc. are related.Intrinsic standoff ratio can in a more specific embodiment,
It is set as 0.012 ~ 0.016, the inverter output voltage after partial pressure is overlapped with 2.5V DC voltage, is then counted
Word sampling, sampling precision are 10, and the value range for threshold value of summing is 140 ~ 160.
If cumulative summed result is less than summation threshold values 150, single-chip microcontroller judges that inverter has occurred in starting state
Short trouble, and it is immediately performed short-circuit protection, close the DC supply input and alternating voltage output of inverter；If cumulative ask
Be greater than summation threshold values 150 with result, then single-chip microcontroller judge inverter in starting state there is no short trouble, and then output
Specified alternating current starts to work normally.
The waveform that Fig. 3 and Fig. 4 respectively illustrates output voltage V and operating current I when inverter is in starting state shows
It is intended to, Fig. 3 is shown the situation that short trouble has occurred in inverter, and Fig. 4 is shown that there is no short trouble occurs
Situation.The bus current of operating current I namely inverter.From figs. 3 and 4 it can be seen that since inverter is in starting state,
Therefore the operating current I of inverter is very small, and it is inverse to judge to have occurred whether can not to produce overcurrent by detection inverter
Become device short trouble or inverter with refrigerating lamp (having accessed cold light bulb).Inverter just start export alternating current at the time of pair
What is answered is the S point in Fig. 3 and Fig. 4, and corresponding at the time of the 22nd acquisition inverter output voltage instantaneous value of inverter is figure
E point in 3 and Fig. 4, E point is the maximum value of a cycle of the sine wave AC voltage of inverter output, in Fig. 2 and Fig. 3
For crest value, valley value can also be.In Fig. 3, since short trouble, the output voltage V of inverter has occurred in inverter
Very small, maximum output voltage only has 1.5V, the summation threshold values 150 of the cumulative summing value of voltage again smaller than setting.And in Fig. 4
In, there is no short troubles for inverter, therefore the output voltage V of inverter is very big, the maximum output voltage value at E point
Reach 30.19V, the cumulative summing value of inverter output voltage is greater than the threshold values 150 of setting.
In the application example, when inverter completes starting in normal operating conditions, current detection circuit is examined in real time
The operating current of inverter is surveyed, and operating current testing result is sent to single-chip microcontroller, single-chip microcontroller is by the operating current of inverter
Testing result is compared with preset current threshold.Current detection circuit realizes that operating current detection is tied by bleeder circuit
Fruit and current threshold are all the voltage values directly proportional to electric current.When inverter completes starting in normal operating conditions, no matter
It is inverter short circuit or with refrigerating lamp, can all generates the high current of moment, therefore compare the work of inverter by single-chip microcontroller
The size of current detecting result and preset current threshold, it is known that inverter short circuit whether has occurred or with refrigerating lamp.
It is about 600us, big electricity in the case where inverter band refrigerating lamp that high current duration is generated in the case where inverter short circuit
Flowing duration is about 950us.
Single-chip microcontroller passes through it was found that operating current testing result is greater than current threshold, then inverter is immediately controlled in single-chip microcontroller
Stop output, restart inverter, and pass through 1.2ms(, that is, preset first time from stopping output from inverter)
Afterwards, control inverter exports alternating current again.After inverter exports alternating current again, if what current detection circuit detected
Inverter operating current is greater than current threshold again, then single-chip microcontroller repeats movement above (namely second executes above dynamic
Make), that is, inverter is immediately controlled and stops output, restarts inverter, and stop passing through from output from inverter
After 1.2ms, control inverter exports alternating current again.
If the number that single-chip microcontroller continuously repeats such movement has met or exceeded 5 times as frequency threshold value, single
Inverter be in short-circuit condition to the judgement of piece machine at this time, and then carries out short-circuit protection, close its power supply direct current input with exchange it is defeated
Out.If single-chip microcontroller continuously repeats such number acted less than 5 times, such as only 2 times, opened again in inverter third time
After moving, exporting alternating current again, the inverter operating current that current detection circuit detects is less than current threshold, then single-chip microcontroller
Judge that inverter is to cause operating current testing result to be more than or equal to current threshold by impact load, so that short circuit be not carried out
Protection, inverter work normally.
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 the situation of short trouble has occurred in inverter, and Fig. 6 is shown inverter band refrigerating lamp, short circuit does not occur
The situation of failure.
The inverter short circuit fault judgment method of the embodiment of the present invention had both been avoided to be connected in inverter and impact load
When erroneous judgement the problem of being short-circuit protection, while short trouble can be also quickly determined that, so as to encounter real short circuit
In the case where quickly cut off the output of inverter, it is ensured that the safety of people and hardware device.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (6)
1. a kind of judgment method of inverter short circuit failure, which is characterized in that be in normal work including completing starting to inverter
Whether occur when making state short trouble judge and when starting state is in inverter whether occur short trouble into
Row judgement, it is described whether occur when completing starting in normal operating conditions to inverter short trouble carry out judgement include with
Lower step:
Step b1, the operating current of current detection circuit real-time detection inverter, and operating current testing result is sent to institute
The controller of inverter is stated, the controller compares the operating current testing result of inverter with preset current threshold
Compared with；
If step b2, the described operating current testing result is more than or equal to the current threshold, inversion is immediately controlled in controller
Device stop output, restart inverter, and from inverter stop output from after preset first time, control
Inverter exports alternating current again, then return step b1；
Step b3, controller is counted to the number for executing step b2 is continuously repeated, if controller, which continuously repeats, executes step
The number of rapid b2 is more than or equal to preset frequency threshold value, then judges that short circuit occurs for inverter, if controller continuously repeats execution
The number of step b2 is less than the frequency threshold value, then judgement is to cause the operating current testing result to be greater than by impact load
Equal to the current threshold；
The judgement that short trouble whether occurs when being in starting state to inverter the following steps are included:
Step a1, it from voltage detecting circuit exports alternating current since inverter is just, is acquired every preset second time
The instantaneous value of inverter output voltage, continuous acquisition n times, and the instantaneous value of collected inverter output voltage is sent out
Give the controller；Wherein, the instantaneous value of the inverter output voltage of n-th acquisition is the sine wave AC of inverter output
Voltage signal instantaneous voltage corresponding at the time of passing through a quarter period is either located at the sine wave of inverter output
Instantaneous voltage between a quarter period and half period of ac voltage signal；
Step a2, the described controller is by the cumulative summation of the instantaneous value of n times inverter output voltage, relatively more cumulative summed result and pre-
If summation threshold value, if cumulative summed result is more than or equal to the summation threshold value, judge inverter there is no short-circuit therefore
Barrier judges that in starting state short trouble has occurred for inverter if cumulative summed result is less than the summation threshold value.
2. the judgment method of inverter short circuit failure as described in claim 1, which is characterized in that the controller of the inverter
It is made of single-chip microcontroller；
In the step b2, if the operating current testing result is more than or equal to the current threshold, the monolithic
Machine is immediately controlled inverter and stops output, restarts inverter, and also remove all flag bits.
3. the judgment method of inverter short circuit failure as described in claim 1, which is characterized in that the value of the first time
Range is 1ms ~ 1.4ms.
4. the judgment method of inverter short circuit failure as described in claim 1, which is characterized in that the value of the frequency threshold value
Range is 5 ~ 7 times.
5. the judgment method of inverter short circuit failure as described in claim 1, which is characterized in that 15 < N < 40.
6. the judgment method of inverter short circuit failure as described in claim 1, which is characterized in that the inverter is vehicle-mounted inverse
Become device.
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| CN109713642B (en) * | 2019-01-29 | 2020-10-02 | 浙江众邦机电科技有限公司 | Sewing machine and short circuit protection system and method thereof |
| CN111371073B (en) * | 2020-04-29 | 2022-06-03 | 深圳创维－Rgb电子有限公司 | Output short-circuit protection circuit and protection control method thereof |
| CN112083348B (en) * | 2020-07-24 | 2023-05-23 | 苏州汇川联合动力系统有限公司 | Method, system and storage medium for detecting single-phase to ground short circuit of motor |
| 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 |
| CN114167970A (en) * | 2021-12-09 | 2022-03-11 | 深圳市海浦蒙特科技有限公司 | Overcurrent protection method and related assembly |
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