CN104793720A - Power source secondary protection method - Google Patents
Power source secondary protection method Download PDFInfo
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- CN104793720A CN104793720A CN201510213037.7A CN201510213037A CN104793720A CN 104793720 A CN104793720 A CN 104793720A CN 201510213037 A CN201510213037 A CN 201510213037A CN 104793720 A CN104793720 A CN 104793720A
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Abstract
The invention discloses a power source secondary protection method. The power source secondary protection method includes the steps that a power source is reset; the starting assignment of the total fault number is zero, and the starting assignment of the time is zero; the power source is started, first-time starting judgment is carried out, and whether the power source is successfully started within a first threshold value time or not is judged; if the power source is successfully started, fault scanning is carried out; if faults occur, the shut-off operation is executed, the total fault number pluses one, and fault scanning is continuously carried if the faults do not occur; if the power source is not successfully started, the shut-off operation is executed, and the total fault number pluses one; whether the total fault number at current is larger than a present total fault number threshold value or not is judged; if the total fault number at current is larger than the present total fault number threshold value, the locking state is started; if the total fault number at current is smaller than or equal to the present total fault number threshold value, a second threshold value time is delayed, and no processing is carried out; then starting judgment is carried out, and whether the power source is successfully started within a first threshold value time or not is judged; if the power source is not successfully started within the first threshold value time, the locking state is started; if the power source is successfully started within the first threshold value time, whether the faults occur within a control period or not is judged; if the faults do not occur, fault scanning is continuously carried out; if the faults occur, the locking state is started.
Description
Technical field
The present invention relates to Energy control technical field, refer to a kind of power supply second protection method especially.
Background technology
In Power Management Design, when fault (all kinds of overvoltages of input and output, under-voltage, overcurrent and overheat protector etc.) occurs, usually adopt turn-off protection, after malfunction is eliminated, carry out recovery and to restart or " locked " turns off.This protected mode, cannot judge it is double faults or chance failure in short-term, take unified protected mode, can not obtain good protected effect to fault.
Existing second protection method stresses to realize reliably protecting to single failure; normally on the basis of basic failure protection function circuit; increase extra protection mechanism, realize when first time, protection act was not operating, realize second layer protection by extra protection mechanism.
Existing second protection method, stresses the function of second time protection, and second time protection is the stand-by protection of first time protection or supplements protection.This protection can not differentiate that fault is chance failure or double faults.During the partial fault generation chance failure of to a certain degree power source, owing to there being the existence of protection mechanism, can allowing to adopt and turn off the mode of restarting and process.And for double faults, particularly double faults in short-term, then need to draw attention.
The circuit realizing second protection has multiple, adopts mimic channel can obtain the malfunctions such as overvoltage, under-voltage, overcurrent, short circuit, excess temperature with comparer, forms time delay with RC circuit etc., then carries out bind lines with certain logical circuit and become second protection.Or use the method for digital circuit, carry out sampling and the epidemic situation comparison of parameter with analog to digital converter, then realize second protection control by the method for software.
Summary of the invention
In view of this; the object of the invention is to propose a kind of power supply second protection method; for comprising input overcurrent, output overvoltage, output is under-voltage, output overcurrent, output short-circuit etc. restart eliminable fault wherein a kind of or all types (hereinafter fault) implement second protection; the Inspect and control of optimal startup process, add setting to fault total degree, make protection more comprehensively and intelligence.
Based on above-mentioned purpose power supply second protection provided by the invention method, it is characterized in that, comprising:
Power reset;
After reset completes, be 0 by the initial assignment of total failare number, the initial assignment of time is 0;
Power initiation starts, and carries out first time to start judgement, judges in the first threshold time, whether power supply successfully starts;
If power initiation success, then carry out fault scanning; If break down, then perform and turn off operation, and total failare number adds 1, if do not break down, then continues to carry out fault scanning;
If power initiation is unsuccessful, then perform and turn off operation, and total failare number adds 1;
Judge whether current total failare number is greater than default total failare number threshold value;
If current total failare number is greater than default total failare number threshold value, then enter locking state;
If current total failare number is less than or equal to default total failare number threshold value, then the time delay Second Threshold time, within the Second Threshold time of time delay, be left intact;
Again carry out startup to judge, judge in the first threshold time, whether power supply successfully starts;
If power initiation is unsuccessful, then performs and turn off operation, and enter locking state;
If power initiation success, then judge whether break down in a control cycle;
If do not break down in a control cycle, then continue to carry out fault scanning;
If there is fault in a control cycle, performed and turned off operation, and entered locking state.
In some embodiments, the described first threshold time doubly calculates according to the longest 2-3 starting normal time of power supply.
In some embodiments, the described Second Threshold time doubly calculates to the 2-3 of zero-time according to the longest shutoff of power supply.
In some embodiments, described control cycle calculates by zero-time sum 10 times of the longest startup normal time and the longest shutoff.
In some embodiments, the probability of happening that operates according to protection of described default total failare number threshold value and harmfulness consequence are carried out setting and select.
As can be seen from above; described power supply second protection method provided by the invention; fault in power initiation and operational process can be monitored, takes shutoff to restart to single failure, to long-time interval single failure exceed certain number of times and in short-term double faults carry out " locked " protection.Play the effect reducing chance failure impact and instant protection double faults.Described power supply second protection method, is different from general secondary protection function, increases the counting to single failure and timing, when cumulative number exceedes certain number of times, or occurs twice fault in short-term, can make " locked " and turn off.Shutoff time delay is then only carried out for chance failure restart.Increase the monitoring to fault in power initiation process simultaneously, start-up study is optimized.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of power supply second protection embodiment of the method provided by the invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
It should be noted that, in the embodiment of the present invention, the statement of all uses " first " and " second " is all the parameters in order to the entity or non-equal distinguishing two same names non-equal, visible " first " " second " convenience only in order to state, should not be construed as the restriction to the embodiment of the present invention, subsequent embodiment illustrates no longer one by one to this.
With reference to accompanying drawing 1, it is the schematic flow sheet of power supply second protection embodiment of the method provided by the invention.
As shown in Figure 1, described power supply second protection method, comprises the following steps:
Step 100: power reset;
The initial assignment of total failare number is 0 by step 101: after having resetted, and the initial assignment of time is 0 (total failare number F=0, time T=0);
Step 102: power initiation starts, carrying out first time starts judgement, judges in first threshold time T1, whether power supply successfully starts;
If power initiation success, then forward step 103 to: carry out fault scanning; If break down, then forward step 104 to: perform and turn off operation, and total failare number F adds 1, if do not break down, then returns step 103: continue to carry out fault scanning;
If power initiation is unsuccessful, then forward step 104 to: perform and turn off operation, and total failare number F adds 1;
Step 105: judge whether current total failare number F is greater than default total failare number threshold value T4;
If current total failare number F is greater than default total failare number threshold value T4, then forward step 110 to: enter locking state;
If current total failare number F is less than or equal to default total failare number threshold value T4, then forward step 106 to: time delay Second Threshold time T2, in the Second Threshold time T2 of time delay, be left intact;
Step 107: again carry out startup and judge, judge in first threshold time T1, whether power supply successfully starts;
If power initiation is unsuccessful, then forward step 109 to: perform and turn off operation, and perform step 110: enter locking state;
If power initiation success, then forward step 108 to: judge whether break down in a control cycle;
If do not break down in a control cycle T3, then think chance failure, forward step 103 to: continue to carry out fault scanning;
If there is fault in a control cycle T3, then forwarded step 109 to: perform and turn off operation, and perform step 110: enter locking state.
Wherein, described shutoff operation refers to and turns off output to system; Described locking state refers to and system is placed in locked guard mode, and resetting to power supply after needing Failure elimination just can restart.
In order to ensure the security performance of system, described first threshold time T1 by 2-3 doubly the longest startup calculate normal time, if the longest startup normal time is 0.3S, then can select first threshold time T1=0.85S.
In order to ensure the security performance of system, by 2-3, doubly the longest shutoff to the zero-time calculates described Second Threshold time T2, if the longest shutoff to the zero-time is 0.1S, then can select Second Threshold time T2=0.27S.
In order to ensure the security performance of system, described control cycle T3 calculates by zero-time sum 10 times of the longest startup normal time and the longest shutoff, if the longest startup normal time is 0.3S, the longest shutoff to zero-time 0.1S, then can select control cycle T3=4S.
The selection of times of described default total failare number threshold value T4, carries out artificial setting and selection by the probability of happening and harmfulness consequence of protecting operation (operation carried out when breaking down), preferably, may be selected to be 20 times.
Embodiment can be found out from above, described power supply second protection method provided by the invention, optimizes the Inspect and control of start-up course, adds setting to fault total degree, makes protection more comprehensively and intelligence.Described power supply second protection method, can monitor the fault in power initiation and operational process, takes shutoff to restart to single failure, to long-time interval single failure exceed certain number of times and in short-term double faults carry out " locked " protection.Play the effect reducing chance failure impact and instant protection double faults.Described power supply second protection method, is different from general secondary protection function, increases the counting to single failure and timing, when cumulative number exceedes certain number of times, or occurs twice fault in short-term, can make " locked " and turn off.Shutoff time delay is then only carried out for chance failure restart.Increase the monitoring to fault in power initiation process simultaneously, start-up study is optimized.
It is important to note that although above-described embodiment gives the reasonable value of parameters, wherein relate to time span, can carry out selecting and setting according to actual conditions.
Those of ordinary skill in the field are to be understood that: the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a power supply second protection method, is characterized in that, comprising:
Power reset;
After reset completes, be 0 by the initial assignment of total failare number, the initial assignment of time is 0;
Power initiation starts, and carries out first time to start judgement, judges in the first threshold time, whether power supply successfully starts;
If power initiation success, then carry out fault scanning; If break down, then perform and turn off operation, and total failare number adds 1, if do not break down, then continues to carry out fault scanning;
If power initiation is unsuccessful, then perform and turn off operation, and total failare number adds 1;
Judge whether current total failare number is greater than default total failare number threshold value;
If current total failare number is greater than default total failare number threshold value, then enter locking state;
If current total failare number is less than or equal to default total failare number threshold value, then the time delay Second Threshold time, within the Second Threshold time of time delay, be left intact;
Again carry out startup to judge, judge in the first threshold time, whether power supply successfully starts;
If power initiation is unsuccessful, then performs and turn off operation, and enter locking state;
If power initiation success, then judge whether break down in a control cycle;
If do not break down in a control cycle, then continue to carry out fault scanning;
If there is fault in a control cycle, performed and turned off operation, and entered locking state.
2. power supply second protection method according to claim 1, is characterized in that, the described first threshold time doubly calculates according to the longest 2-3 starting normal time of power supply.
3. power supply second protection method according to claim 1, is characterized in that, the described Second Threshold time doubly calculates to the 2-3 of zero-time according to the longest shutoff of power supply.
4. power supply second protection method according to claim 1, is characterized in that, described control cycle calculates by zero-time sum 10 times of the longest startup normal time and the longest shutoff.
5. power supply second protection method according to claim 1, is characterized in that, the probability of happening that described default total failare number threshold value operates according to protection and harmfulness consequence are carried out setting and selected.
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| CN201510213037.7A CN104793720B (en) | 2015-04-29 | 2015-04-29 | A kind of power supply second protection method |
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| CN201510213037.7A CN104793720B (en) | 2015-04-29 | 2015-04-29 | A kind of power supply second protection method |
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| CN104793720B CN104793720B (en) | 2017-08-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106026628A (en) * | 2016-06-30 | 2016-10-12 | 江苏国网自控科技股份有限公司 | Restarting control method and apparatus for resetting locking type frequency converter |
| CN110399028A (en) * | 2019-06-28 | 2019-11-01 | 苏州浪潮智能科技有限公司 | Method, equipment and the medium for preventing surge from occurring when a kind of power supply batch operation |
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| CN101877480A (en) * | 2009-12-10 | 2010-11-03 | 贵州电力试验研究院 | Method for judging voltage compensation of single-pole adaptive reclosure of electric transmission line |
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Cited By (3)
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| CN106026628A (en) * | 2016-06-30 | 2016-10-12 | 江苏国网自控科技股份有限公司 | Restarting control method and apparatus for resetting locking type frequency converter |
| CN106026628B (en) * | 2016-06-30 | 2018-07-10 | 江苏国网自控科技股份有限公司 | A kind of reset locking-type frequency converter resumption control method and device |
| CN110399028A (en) * | 2019-06-28 | 2019-11-01 | 苏州浪潮智能科技有限公司 | Method, equipment and the medium for preventing surge from occurring when a kind of power supply batch operation |
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| CN104793720B (en) | 2017-08-01 |
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