CN102723699B - A kind of DC power supplier guard method and device - Google Patents
A kind of DC power supplier guard method and device Download PDFInfo
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- CN102723699B CN102723699B CN201210202512.7A CN201210202512A CN102723699B CN 102723699 B CN102723699 B CN 102723699B CN 201210202512 A CN201210202512 A CN 201210202512A CN 102723699 B CN102723699 B CN 102723699B
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Abstract
The invention discloses a kind of DC power supplier guard method and device; on the basis of module software current limliting; the circulation pattern restarted after adopting fault shutdown; the short circuit trouble point of power-supply system with the cancellation module place that contributes to being come by heat history cutting system sky; what not only realize is with low cost, to attendant's not requirement, reduces maintenance cost and maintenance technology difficulty; and the reliability of short-circuit protection can be significantly improved, there is higher cost performance.
Description
Technical field
The present invention relates to switch power technology field, particularly relate to a kind of DC power supplier guard method and device.
Background technology
Railway high frequency switch power is due to special application, to the requirement of reliability far above the general product for civilian use. During practical application, DC power supplier is by air switch mounting output loading electrical equipment. If there is output overloading/short-circuit conditions in scene, it is necessary to module to be transshipped/short-circuit protection, it is prevented that device damage.
In practical work process; Switching Power Supply is probably due to the reasons such as output loading overload/short-circuit or artificial wiring error cause module short circuit; and then operation irregularity even aircraft bombing, it is therefore desirable to the overload/short-circuit protection design carrying out necessity under module overload/Short-circuit Working Condition. Suitable overload/short-circuit protection design can not only make to prevent module from further device failure occurring, moreover it is possible to if after ensureing that external maloperation eliminates, restarting and normal operation.
Existing overload/short-circuit protection method includes:
1, overload/short circuit wave limiting shutting down
By the overload/short circuit condition of detecting module, it is judged that whether module is in overload/short circuit. Short-circuit protection circuit as shown in Figure 1; once meet overload/short circuit fault condition; by the wave limiting function of hardware, the PWM waveform driving switching tube is carried out restriction dutycycle to process; so that disappearing top and obtaining amplitude limit occur in module output current waveform, it is prevented that switching device punctures because crossing stream. On this basis, coordinate time delay tally function, when, after the satisfied setting time, closing the power section of module.
In order to conveniently find out the process of wave limiting, (DC Module similar, difference is unidirectional wave limiting) is illustrated, along with the continuous increase of sinusoidal magnitude with the wave limiting of AC module, the dutycycle at peak value place progressively closes off, and the top that disappears occurs in the waveform crest place of output electric current. Prevent overload/short circuit from puncturing by the mode of the wave limiting of hardware, although can be effectively protected, but the overload/short circuit of output rear end is abnormal, it is impossible to got rid of by wave limiting. So, the system of DC Module mounting output loading is under overload/short trouble all the time.
2, overload/short circuit virtual protection
Utilizing digital signal processor DSP to realize, when after satisfied overload/short circuit condition (, lower than setting value, output off current HIGH is in setting value for output voltage), turn off the driving of respective switch element in module by force, module is in standby without output state.
Overload/short circuit virtual protection is a kind of hard protection, once after assert that overload/short trouble occurs in module, module is shutdown only, stops externally output, after waiting Failure elimination, restarts. The troubleshooting cycle is long, very flexible, and protection speed is excessively slow, it is impossible to independent is applied in AC module. Additionally, the problem with said method 1 is identical, the overload/short circuit of output rear end is abnormal, it is impossible to got rid of by this protection. So, the system of DC Module mounting output loading is under overload/short trouble equally all the time.
Summary of the invention
It is an object of the invention to propose a kind of DC power supplier guard method and device, it is possible to opened by heat history cutting system sky, carry out the short circuit trouble point of the power-supply system at cancellation module place.
For reaching this purpose, the present invention by the following technical solutions:
A kind of DC power supplier guard method, the method includes: the DC power supplier that overload or short circuit occur is carried out current limliting; The cyclic process of current limliting and cycle power is controlled, until Failure elimination or output sky open automatic disjunction according to default logical time delay.
The logical time delay that described basis is preset controls the cyclic process of current limliting and cycle power and farther includes, and described DC power supplier carries out the time of current limliting more than after the first logical time delay, and this module is shut down; When the unused time more than the second logical time delay after, this module is restarted; If overload or short circuit yet suffer from, then again carry out current limliting.
Entering limited current state, output sky drives row heat accumulation into every time, and when heat accumulation reaches the predetermined value of empty exoneration button, described output sky opens automatic disjunction.
Judge whether that overload or the method for short circuit include, it is judged that output voltage whether less than predetermined voltage threshold and output electric current whether more than predetermined current threshold.
When output voltage exports electric current more than predetermined current threshold less than predetermined voltage threshold simultaneously, and the persistent period reaches to preset time delay, then it is determined that the presence of overload or short circuit.
When described DC power supplier carries out current limliting, current-limiting points given depends on the line voltage of input and the setting current value of host computer or monitoring module.
A kind of DC power supplier protection device, including
Software flow-restriction, for carrying out current limliting to the DC power supplier that overload or short circuit occur;
Virtual protection unit, for controlling the cyclic process of current limliting and cycle power, until Failure elimination or output sky open automatic disjunction according to the logical time delay preset.
Described virtual protection unit includes
Current limliting timing unit, carries out the time of current limliting for recording DC power supplier, after more than the first logical time delay, module is shut down;
Shutdown timing unit, for recording the time of DC power supplier shutdown, after more than the second logical time delay, restarts module;
Breakdown judge unit, is used for judging whether overload or short circuit yet suffer from, if existing, again carries out current limliting.
Described breakdown judge unit judges output voltage exports electric current more than predetermined current threshold less than predetermined voltage threshold simultaneously, and the persistent period reaches to preset time delay, then it is determined that the presence of overload or short circuit.
When described software flow-restriction carries out current limliting, current-limiting points given depends on the line voltage of input and the setting current value of host computer or monitoring module.
Adopt technical scheme; can be opened by heat history cutting system sky; carry out the short circuit trouble point of the power-supply system at cancellation module place; what not only realize is with low cost; to attendant's not requirement; reduction maintenance cost and maintenance technology difficulty, and the reliability of short-circuit protection can be significantly improved, there is higher cost performance.
Accompanying drawing explanation
Fig. 1 is the existing circuit diagram being realized short-circuit protection by hardware wave limiting.
Fig. 2 is the schematic flow sheet of the DC power supplier guard method that the embodiment of the present invention provides.
Fig. 3 is the schematic diagram of the software current-limiting mode adopted in the embodiment of the present invention.
Fig. 4 is functional picture given about current-limiting points in the embodiment of the present invention.
Fig. 5 is the cyclic process schematic diagram of current limliting and cycle power in the embodiment of the present invention.
Fig. 6 is the structural representation of the DC power supplier protection device that the embodiment of the present invention provides.
Detailed description of the invention
The present invention main idea is that, on the basis of module software current limliting, the logical time delay restarted after arranging the shutdown of current limliting and fault, with the short circuit trouble point of power-supply system at the cancellation module place that contributes to being come by heat history cutting system sky. This DC source protection scheme, mainly includes two-part realization, and a part is software current limliting, and another part is by logical design, and these two parts mainly complete in DSP digitial controller.
Technical scheme is further illustrated below in conjunction with accompanying drawing and by detailed description of the invention.
Fig. 2 is the DC power supplier guard method schematic flow sheet that the embodiment of the present invention provides, and the method includes:
S201, carries out current limliting to the DC power supplier that overload or short circuit occur.
The software restrictor ring of the embodiment of the present invention designs in digital processing chip DSP, as it is shown on figure 3, the current-limiting points I of output electric currentsetLmt1Depend on the line voltage V of inputinAnd the setting value I of host computer or monitoring modulesetLmt��
When inputting line voltage and being too low, module will reduce current-limiting points. As when input line voltage scope between [154V, 286V] time, the given I of current-limiting pointssetLmt1Setting value I for monitoring modulesetLmt; When inputting line voltage lower than 154V, current-limiting points gives IsetLmt1=0.5IsetLmt��
As DSP adopts Q12 calibration, then the fixed-point number �� of the setting value of host computer or monitoring module1, as shown in Figure 4,
Q12 correspondence ranges for 0-4096, represents and digital quantity 1 is divided into 4096 parts, for instance 0.5 calibrates according to Q12, then be 2048.
In the embodiment of the present invention, by detecting output voltage and output electric current, described DC power supplier comes whether determination module is likely to be at short-circuit condition, when output voltage is less than predetermined voltage threshold when output electric current exceedes predetermined current threshold while, then can be likely to occur overload or short trouble in preliminary judgement scene. In order to determine whether fault exists, also needing to judge according to default time delay, the persistent period such as above-mentioned state has exceeded default time delay, then can confirm that described overload or short-circuit condition are implicitly present in.
S202, controls the cyclic process of current limliting and cycle power according to default logical time delay, until Failure elimination or output sky open automatic disjunction.
This step is the further process on software current limliting basis, when after module current limliting, continues for some time, and module is shut down, then continues for some time, and module is restarted, if fault yet suffers from, continues current limliting, so circulates. The logical time delay that described basis is preset controls the detailed step of the cyclic process of current limliting and cycle power as shown in Figure 5:
After module meets the fault verification condition described in S201, enter limited current state.
S501, when the current limliting time is more than the first logical time delay, module is shut down. Controlled the persistent period of module limited current state by the first default logical time delay, after exceeding this persistent period, module is shut down, but accessory power supply is still in work.
S502, when the unused time is more than the second logical time delay, module is restarted. Controlled the time of module shutdown by default second logical time delay, after the unused time exceedes described second logical time delay, module will be restarted.
S503, it is judged that whether fault exists. After module is restarted, will first determine whether whether overload or short trouble yet suffer from. As fault eliminates, then as S504 module will recover normal condition; As fault yet suffers from, then such as S201, module will be again introduced into limited current state, continue above steps.
Overload or short trouble eliminate, it is possible to make above-mentioned cyclic process terminate, if fault exists always, then output sky meeting automatic disjunction because of heat accumulation effect, thus eliminating the trouble point of this module place power-supply system.
The current limliting stage in above-mentioned cyclic process, the heat accumulation that current limit is opened at output sky is continuously increased, according to the de-mouth curve that concrete sky is opened, when output sky opens the actual heat energy of accumulation, after reaching the setting of empty exoneration button curve, output sky opens automatic disjunction, thus decreasing human intervention and maintenance cost.
Accordingly, embodiments providing a kind of DC power supplier protection device, as shown in Figure 6, this device includes:
Software flow-restriction, is connected with virtual protection unit, for the DC power supplier that overload or short circuit occur is carried out current limliting;
Virtual protection unit, is connected with software flow-restriction, for controlling the cyclic process of current limliting and cycle power according to the logical time delay preset, until Failure elimination or output sky open automatic disjunction.
Described virtual protection unit farther includes:
Current limliting timing unit, is connected with software flow-restriction and shutdown timing unit, carries out the time of current limliting for recording DC power supplier, after more than the first logical time delay, module is shut down;
Shutdown timing unit, is connected with current limliting timing unit and breakdown judge unit, for recording the time of DC power supplier shutdown, after more than the second logical time delay, module is restarted;
Breakdown judge unit, is connected with shutdown timing unit and software flow-restriction, is used for judging whether overload or short circuit yet suffer from, if existing, again carries out current limliting.
Described breakdown judge unit, it is judged that output voltage exports electric current more than predetermined current threshold less than predetermined voltage threshold simultaneously, and the persistent period reach preset time delay, then it is determined that the presence of overload or short circuit.
When described software flow-restriction carries out current limliting, current-limiting points given depends on the line voltage of input and the setting current value of host computer or monitoring module.
When inputting line voltage and being too low, module will reduce current-limiting points. As when input line voltage scope between [154V, 286V] time, the given I of current-limiting pointssetLmt1Setting value I for monitoring modulesetLmt; When inputting line voltage lower than 154V, current-limiting points gives IsetLmt1=0.5IsetLmt��
Adopt technical scheme; can be opened by heat history cutting system sky; carry out the short circuit trouble point of the power-supply system at cancellation module place; what not only realize is with low cost; to attendant's not requirement; reduction maintenance cost and maintenance technology difficulty, and the reliability of short-circuit protection can be significantly improved, there is higher cost performance.
This programme is mainly used in the overload/short-circuit protection occasion of DC Module, requires higher occasion especially for system stability, such as: signal power source system, the power supply system for communications, electric operation power etc.
Those skilled in the art should be understood that, each module or each step in the above-mentioned embodiment of the present invention can realize with general calculation element, they can concentrate on single calculation element, or it is distributed on the network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, can be stored in storage device is performed by calculation element, or they are fabricated to respectively each integrated circuit modules, or the multiple modules in them or step are fabricated to single integrated circuit realize. so, the present invention is not restricted to the combination of any specific hardware and software.
The above; being only the present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto, any people being familiar with this technology is in the technical scope that disclosed herein; the change that can readily occur in 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 scope of the claims.
Claims (7)
1. a DC power supplier guard method, it is characterised in that the method includes: to judging that the DC power supplier that overload or short circuit occur carries out current limliting; The cyclic process of current limliting and cycle power is controlled according to default logical time delay, until Failure elimination or output sky open automatic disjunction, described output sky is opened automatic disjunction and is specially, enter limited current state every time, output sky drives row heat accumulation into, when heat accumulation reaches the predetermined value of empty exoneration button, described output sky opens automatic disjunction;
When described DC power supplier carries out current limliting, current-limiting points given depends on the line voltage of input and the setting current value of host computer or monitoring module.
2. method according to claim 1, it is characterised in that the logical time delay that described basis is preset controls the cyclic process of current limliting and cycle power and farther includes, described DC power supplier carries out the time of current limliting more than after the first logical time delay, and this module is shut down; When the unused time more than the second logical time delay after, this module is restarted; If overload or short circuit yet suffer from, then again carry out current limliting.
3. method according to claim 1 and 2, it is characterised in that judge whether that overload or short circuit include, it is judged that output voltage whether less than predetermined voltage threshold and output electric current whether more than predetermined current threshold.
4. method according to claim 3, it is characterised in that when output voltage exports electric current more than predetermined current threshold less than predetermined voltage threshold simultaneously, and the persistent period reach preset time delay, then it is determined that the presence of overload or short circuit.
5. a DC power supplier protection device, it is characterised in that include
Software flow-restriction, for carrying out current limliting to the DC power supplier that overload or short circuit occur;
Virtual protection unit, for controlling the cyclic process of current limliting and cycle power according to the logical time delay preset, until Failure elimination or output sky open automatic disjunction, described output sky is opened automatic disjunction and is specially, enter limited current state every time, output sky drives row heat accumulation into, and when heat accumulation reaches the predetermined value of empty exoneration mouth, described output sky opens automatic disjunction;
When described software flow-restriction carries out current limliting, current-limiting points given depends on the line voltage of input and the setting current value of host computer or monitoring module.
6. device according to claim 5, it is characterised in that described virtual protection unit includes
Current limliting timing unit, carries out the time of current limliting for recording DC power supplier, after more than the first logical time delay, module is shut down;
Shutdown timing unit, for recording the time of DC power supplier shutdown, after more than the second logical time delay, restarts module;
Breakdown judge unit, is used for judging whether overload or short circuit exist, if existing, again carries out current limliting.
7. device according to claim 6, it is characterised in that described breakdown judge unit judges output voltage exports electric current more than predetermined current threshold less than predetermined voltage threshold simultaneously, and the persistent period reach preset time delay, then it is determined that the presence of overload or short circuit.
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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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| CN201210202512.7A CN102723699B (en) | 2012-06-15 | 2012-06-15 | A kind of DC power supplier guard method and device |
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| EP3797460A1 (en) * | 2018-07-17 | 2021-03-31 | Siemens Energy Global GmbH & Co. KG | Method and device for detecting an error in a high-voltage direct current transmission line and generating an activating signal for a direct current circuit breaker |
| 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 |
| CN109687384B (en) * | 2018-12-29 | 2020-05-08 | 苏州路之遥科技股份有限公司 | High-power cutting protection and reset method based on reactive power calculation |
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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. |
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