CN102723699A - Method and device for protection of direct-current power module - Google Patents
Method and device for protection of direct-current power module Download PDFInfo
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- CN102723699A CN102723699A CN2012102025127A CN201210202512A CN102723699A CN 102723699 A CN102723699 A CN 102723699A CN 2012102025127 A CN2012102025127 A CN 2012102025127A CN 201210202512 A CN201210202512 A CN 201210202512A CN 102723699 A CN102723699 A CN 102723699A
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Abstract
The invention discloses a method and a device for protection of direct-current power module. A cyclical pattern of restarting after shutdown due to faults is adopted on the basis of module software current limiting to facilitate elimination of short-circuit fault points of a power system of the module through an air switch of a thermal accumulation breaking system. Implementation cost is low, requirements on maintenance personnel are avoided, maintenance cost and maintenance technical difficulty are lowered, reliability in short-circuit protection is remarkably improved, and the method and the device for protection of the direct-current power module have high cost performance.
Description
Technical field
The present invention relates to the switch power technology field, relate in particular to a kind of DC power supplier guard method and device.
Background technology
Railway with high frequency switch power because special application, to the requirement of reliability far above the general product for civilian use.During practical application, DC power supplier articulates output loading electrical equipment through air switch.If output overloading/short-circuit conditions appears in the scene, need transship to module/short-circuit protection, prevent device damage.
In the practical work process; Switching Power Supply maybe be because output loading overload/short circuit or artificial reasons such as wiring error cause module short circuit; And then operation irregularity even aircraft bombing, therefore need transship to module/carry out necessary overload/short-circuit protection design under the short circuit operating mode.Suitable overload/short-circuit protection design not only can make and prevent that module from further device failure taking place, and can also guarantee if after external misoperation is eliminated, restart and operate as normal.
Existing overload/short-circuit protection method comprises:
1, overload/short circuit wave limiting and shutdown
Through the overload/short circuit condition of detecting module, whether judge module is in overload/short circuit.Short-circuit protection circuit as shown in Figure 1; In case satisfy overload/short circuit fault condition; Wave limiting function through hardware limits duty ratio to the PWM waveform of driving switch pipe and handles; Thereby make the module output current wave occur disappearing the top and obtain amplitude limit, prevent that switching device from puncturing because of overcurrent.On this basis, cooperate the time-delay tally function, after satisfying setting-up time, the power section of closing module.
Find out the process of wave limiting for ease; With the wave limiting signal that exchanges module (direct current module similar, difference is unidirectional wave limiting), along with the continuous increase of sinusoidal wave amplitude; The duty ratio at peak value place is closed gradually, the top that occurs disappearing, the waveform crest place of output current.The mode of the wave limiting through hardware prevents that overload/short circuit from puncturing, though can be effectively protected, the overload/short circuit of output rear end is unusual, can't get rid of through wave limiting.Like this, the direct current module system that articulates output loading is under overload/short trouble all the time.
2, overload/short circuit virtual protection
Utilize digital signal processor DSP to realize, after satisfied overload/short circuit condition (output voltage is lower than set point, and output current is higher than set point), the driving of turning off respective switch element in the module by force, module is in standby no-output state.
Overload/short circuit virtual protection is a kind of hard protection, in case after assert that overload/short trouble appears in module, module has only shutdown, stops external output, wait the pending fault elimination after, restart.The troubleshooting cycle is long, very flexible, and protection speed is slow excessively, can not independently be applied in to exchange in the module.In addition, identical with the problem of above-mentioned method 1, the overload/short circuit of output rear end is unusual, can't get rid of through this protection.Like this, the direct current module system that articulates output loading is under overload/short trouble equally all the time.
Summary of the invention
The objective of the invention is to propose a kind of DC power supplier guard method and device, can open, come the short circuit trouble point of the power-supply system at cancellation module place through heat history cutting system sky.
For reaching this purpose, the present invention adopts following technical scheme:
A kind of DC power supplier guard method, this method comprises: the DC power supplier to overload or short circuit take place carries out current limliting; According to the preset logical time delay control current limliting and the cyclic process of cycle power, perhaps exporting sky opens automatic disjunction until the fault elimination.
The logical time delay control current limliting that said basis is preset and the cyclic process of cycle power comprise that further said DC power supplier carries out the time of current limliting above behind first logical time delay, this module shutdown; After the unused time surpassed second logical time delay, this module was restarted; If overload or short circuit still exist, then carry out current limliting once more.
Each limited current state that gets into, the output sky drives capable heat accumulation into, and when heat accumulation reached the predetermined value of empty exoneration button, said output sky was opened automatic disjunction.
Judge whether to exist the method for overload or short circuit to comprise, judge output voltage whether less than predetermined voltage threshold and output current whether greater than the predetermined current threshold value.
When output voltage less than predetermined voltage threshold simultaneously output current greater than the predetermined current threshold value, and the duration reach preset time-delay, then judge to have overload or short circuit.
When said DC power supplier carries out current limliting, the given line voltage of input and the setting current value of host computer or monitoring module of depending on of current-limiting points.
A kind of DC power supplier protective device comprises
Software current limliting unit is used for the DC power supplier that overload or short circuit take place is carried out current limliting;
The virtual protection unit is used for according to the preset logical time delay control current limliting and the cyclic process of cycle power, eliminates or exports sky until fault and open automatic disjunction.
Said virtual protection unit comprises
The current limliting timing unit is used to write down the time that DC power supplier carries out current limliting, after surpassing first logical time delay, module is shut down;
The shutdown timing unit is used to write down the time that DC power supplier shuts down, and after surpassing second logical time delay, module is restarted;
The fault judgement unit is used for judging whether overload or short circuit still exist, and then carry out current limliting once more if exist.
Said fault judgement unit judges output voltage less than predetermined voltage threshold simultaneously output current greater than the predetermined current threshold value, and the duration reach preset time-delay, then judge to have overload or short circuit.
When said software current limliting unit carries out current limliting, the given line voltage of input and the setting current value of host computer or monitoring module of depending on of current-limiting points.
Adopt technical scheme of the present invention; Can open through heat history cutting system sky, come the short circuit trouble point of the power-supply system at cancellation module place, that not only realizes is with low cost; The attendant is not required; Reduce maintenance cost and maintenance technology difficulty, and can significantly improve the reliability of short-circuit protection, have high cost performance.
Description of drawings
Fig. 1 is the existing circuit diagram of realizing short-circuit protection through the hardware wave limiting.
Fig. 2 is the schematic flow sheet of the DC power supplier guard method that provides of the embodiment of the invention.
Fig. 3 is the sketch map of the software current-limiting mode that adopts in the embodiment of the invention.
Fig. 4 is about the given functional picture of current-limiting points in the embodiment of the invention.
Fig. 5 is the cyclic process sketch map of current limliting and cycle power in the embodiment of the invention.
Fig. 6 is the structural representation of the DC power supplier protective device that provides of the embodiment of the invention.
Embodiment
Main thought of the present invention is, on the basis of module software current limliting, the logical time delay of restarting after the shutdown of current limliting and fault is set, to help through the come short circuit trouble point of power-supply system at cancellation module place of heat history cutting system sky.This DC power supply protection scheme mainly comprises two-part realization, and a part is the software current limliting, and another part is through logical design, and these two parts mainly are in the DSP digitial controller, to accomplish.
Further specify technical scheme of the present invention below in conjunction with accompanying drawing and through embodiment.
Fig. 2 is the DC power supplier guard method schematic flow sheet that the embodiment of the invention provides, and this method comprises:
S201 carries out current limliting to the DC power supplier that overload or short circuit take place.
The software restrictor ring design of the embodiment of the invention is in digital processing chip DSP, and is as shown in Figure 3, the current-limiting points I of output current
SetLmt1The line voltage V that depends on input
InAnd the set point I of host computer or monitoring module
SetLmt
Cross when low when the input line voltage, module will reduce current-limiting points.As when input line voltage scope between [154V, 286V] time, the given I of current-limiting points
SetLmt1Set point I for monitoring module
SetLmtWhen the input line voltage is lower than 154V, the given I of current-limiting points
SetLmt1=0.5I
SetLmt
Adopt Q12 calibration, then the fixed-point number λ of the set point of host computer or monitoring module like DSP
1, it is as shown in Figure 4,
The corresponding scope of Q12 is 0-4096, and expression is divided into 4096 parts with digital quantity 1, and for example 0.5 according to the Q12 calibration, then is 2048.
In the embodiment of the invention; Said DC power supplier comes determination module whether possibly be in short-circuit condition through detecting output voltage and output current; When output current surpasses the predetermined current threshold value output voltage is less than predetermined voltage threshold simultaneously, but then overload or short trouble possibly appear in the preliminary judgement scene.In order to confirm whether fault exists, also need judge according to preset time-delay, surpassed preset time-delay like duration of above-mentioned state, can confirm that then said overload or short-circuit condition exist really.
S202, according to the preset logical time delay control current limliting and the cyclic process of cycle power, perhaps exporting sky opens automatic disjunction until the fault elimination.
This step is the further processing on software current limliting basis, after the module current limliting, continues a period of time, and the module shutdown continues a period of time again, and module is restarted, if fault still exists and then continues current limliting, and so circulation.The detailed step of the logical time delay control current limliting that said basis is preset and the cyclic process of cycle power is as shown in Figure 5:
After module satisfies the fault verification condition described in the S201, get into limited current state.
S501 surpasses first logical time delay when the current limliting time, the module shutdown.Through the duration of the first preset logical time delay control module limited current state, above module shutdown after this duration, but accessory power supply is still in work.
S502 surpasses second logical time delay when the unused time, and module is restarted.Through the time of preset second logical time delay control module shutdown, module will be restarted above behind said second logical time delay unused time.
S503, whether failure judgement exists.After module is restarted, will judge at first whether overload or short trouble still exist.Eliminate like fault, then will recover normal condition like the S504 module; Still exist like fault, then like S201, module will get into limited current state once more, continue above-mentioned each step.
Overload or short trouble are eliminated, and above-mentioned cyclic process is finished, if fault exists always, then export empty meeting because of the disjunction automatically of heat accumulation effect, thereby have eliminated the fault point of this module place power-supply system.
The current limliting stage in above-mentioned cyclic process; Current limit constantly increases at the empty heat accumulation of opening of output; Take off a mouthful curve according to what concrete sky was opened, open the actual heat energy of accumulation when output is empty, reach the setting of empty exoneration button curve after; The output sky is opened automatic disjunction, thereby has reduced human intervention and maintenance cost.
Accordingly, the embodiment of the invention provides a kind of DC power supplier protective device, and is as shown in Figure 6, and this device comprises:
Software current limliting unit is connected with the virtual protection unit, is used for the DC power supplier that overload or short circuit take place is carried out current limliting;
The virtual protection unit is connected with software current limliting unit, is used for according to the preset logical time delay control current limliting and the cyclic process of cycle power, eliminates or exports sky until fault and open automatic disjunction.
Said virtual protection unit further comprises:
The current limliting timing unit is connected with the shutdown timing unit with software current limliting unit, is used to write down the time that DC power supplier carries out current limliting, after surpassing first logical time delay, module is shut down;
The shutdown timing unit is connected with the fault judgement unit with the current limliting timing unit, is used to write down the time of DC power supplier shutdown, after surpassing second logical time delay, module is restarted;
The fault judgement unit is connected with software current limliting unit with the shutdown timing unit, is used for judging whether overload or short circuit still exist, and then carry out current limliting once more if exist.
Said fault judgement unit, judge output voltage less than predetermined voltage threshold simultaneously output current greater than the predetermined current threshold value, and the duration reach preset time-delay, then judge to have overload or short circuit.
When said software current limliting unit carries out current limliting, the given line voltage of input and the setting current value of host computer or monitoring module of depending on of current-limiting points.
Cross when low when the input line voltage, module will reduce current-limiting points.As when input line voltage scope between [154V, 286V] time, the given I of current-limiting points
SetLmt1Set point I for monitoring module
SetLmtWhen the input line voltage is lower than 154V, the given I of current-limiting points
SetLmt1=0.5I
SetLmt
Adopt technical scheme of the present invention; Can open through heat history cutting system sky, come the short circuit trouble point of the power-supply system at cancellation module place, that not only realizes is with low cost; The attendant is not required; Reduce maintenance cost and maintenance technology difficulty, and can significantly improve the reliability of short-circuit protection, have high cost performance.
This programme is mainly used in the overload/short-circuit protection occasion of direct current module, the occasion of particularly having relatively high expectations to the stability of a system, such as: signal power source system, the power supply system for communications, electric power operation power supply etc.
Those skilled in the art should be understood that; Each module in the above-mentioned embodiment of the invention or each step can realize that they can concentrate on the single calculation element with the general calculation device, perhaps are distributed on the network that a plurality of calculation element forms; Alternatively; They can realize with the executable program code of calculation element, thereby, can they be stored in the storage device and carry out by calculation element; Perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into single integrated circuit and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with this technological people in the technical scope that the present invention disclosed; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1. a DC power supplier guard method is characterized in that, this method comprises: the DC power supplier to overload or short circuit take place carries out current limliting; According to the preset logical time delay control current limliting and the cyclic process of cycle power, perhaps exporting sky opens automatic disjunction until the fault elimination.
2. method according to claim 1 is characterized in that, the logical time delay control current limliting that said basis is preset and the cyclic process of cycle power comprise that further said DC power supplier carries out the time of current limliting above behind first logical time delay, this module shutdown; After the unused time surpassed second logical time delay, this module was restarted; If overload or short circuit still exist, then carry out current limliting once more.
3. method according to claim 1 and 2 is characterized in that, gets into limited current state at every turn, and the output sky drives capable heat accumulation into, and when heat accumulation reached the predetermined value of empty exoneration button, said output sky was opened automatic disjunction.
4. method according to claim 1 and 2 is characterized in that, saidly judges whether to exist overload or short circuit to comprise, judge output voltage whether less than predetermined voltage threshold and output current whether greater than the predetermined current threshold value.
5. method according to claim 4 is characterized in that, when output voltage less than predetermined voltage threshold simultaneously output current greater than the predetermined current threshold value, and the duration reach preset time-delay, then judge to have overload or short circuit.
6. method according to claim 1 is characterized in that, when said DC power supplier carries out current limliting, and the given line voltage of input and the setting current value of host computer or monitoring module of depending on of current-limiting points.
7. a DC power supplier protective device is characterized in that, comprises
Software current limliting unit is used for the DC power supplier that overload or short circuit take place is carried out current limliting;
The virtual protection unit is used for according to the preset logical time delay control current limliting and the cyclic process of cycle power, eliminates or exports sky until fault and open automatic disjunction.
8. device according to claim 7 is characterized in that, said virtual protection unit comprises
The current limliting timing unit is used to write down the time that DC power supplier carries out current limliting, after surpassing first logical time delay, module is shut down;
The shutdown timing unit is used to write down the time that DC power supplier shuts down, and after surpassing second logical time delay, module is restarted;
The fault judgement unit is used for judging whether overload or short circuit exist, and then carry out current limliting once more if exist.
9. device according to claim 8 is characterized in that, said fault judgement unit judges output voltage less than predetermined voltage threshold simultaneously output current greater than the predetermined current threshold value, and the duration reach preset time-delay, then judge to have overload or short circuit.
10. device according to claim 7 is characterized in that, when said software current limliting unit carries out current limliting, and the given line voltage of input and the setting current value of host computer or monitoring module of depending on of current-limiting points.
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| CN201210202512.7A CN102723699B (en) | 2012-06-15 | 2012-06-15 | A kind of DC power supplier guard method and device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104914441A (en) * | 2015-01-29 | 2015-09-16 | 上海兰宝传感科技股份有限公司 | Self-recognition output method of photoelectric sensor |
| CN105159058A (en) * | 2015-07-27 | 2015-12-16 | 兖州煤业股份有限公司 | Pilot circuit control method, pilot circuit controller and pilot circuit |
| CN105416072A (en) * | 2015-12-22 | 2016-03-23 | 郑州宇通客车股份有限公司 | Trolley bus trolley pole off-line judgment method and trolley bus power system |
| CN109390923A (en) * | 2018-12-18 | 2019-02-26 | 珠海格力电器股份有限公司 | Power distribution control method and device for low-voltage direct controller switching equipment |
| CN109412567A (en) * | 2018-12-28 | 2019-03-01 | 上海南芯半导体科技有限公司 | A kind of guard method of device for power switching failure process |
| CN109687384A (en) * | 2018-12-29 | 2019-04-26 | 苏州路之遥科技股份有限公司 | A kind of high-power excision protection and repositioning method based on calculating reactive power |
| CN110034544A (en) * | 2019-03-25 | 2019-07-19 | 深圳市商宇电子科技有限公司 | A kind of IGBT driving and wave limiting circuit control method |
| CN112640238A (en) * | 2018-07-17 | 2021-04-09 | 西门子能源全球有限公司 | Method and device for identifying a fault in an HVDC line and generating a trigger signal for a DC circuit breaker |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112640238A (en) * | 2018-07-17 | 2021-04-09 | 西门子能源全球有限公司 | Method and device for identifying a fault in an HVDC line and generating a trigger signal for a DC circuit breaker |
| CN112640238B (en) * | 2018-07-17 | 2022-09-30 | 西门子能源全球有限公司 | Method and device for identifying a fault in an HVDC line and generating a trigger signal for a DC circuit breaker |
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| CN109390923B (en) * | 2018-12-18 | 2019-12-10 | 珠海格力电器股份有限公司 | Power distribution control method and device for low-voltage direct-current power distribution equipment |
| CN109390923B8 (en) * | 2018-12-18 | 2020-02-28 | 珠海格力电器股份有限公司 | Power distribution control method and device for low-voltage direct-current power distribution equipment |
| CN109412567A (en) * | 2018-12-28 | 2019-03-01 | 上海南芯半导体科技有限公司 | A kind of guard method of device for power switching failure process |
| CN109687384A (en) * | 2018-12-29 | 2019-04-26 | 苏州路之遥科技股份有限公司 | A kind of high-power excision protection and repositioning method based on calculating reactive power |
| CN110034544A (en) * | 2019-03-25 | 2019-07-19 | 深圳市商宇电子科技有限公司 | A kind of IGBT driving and wave limiting circuit control method |
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| CN102723699B (en) | 2016-06-08 |
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Address after: 100070, No. 2, building 18, 188, base station, South Fourth Ring Road West, Beijing, Fengtai District Patentee after: Beijing Dinghan Technology Group Co., Ltd. Address before: 100070, No. 2, building 18, 188, base station, South Fourth Ring Road West, Beijing, Fengtai District Patentee before: Beijing Dinghan Technology Co., Ltd. |