CN1767298A - Output overvoltage detection protecting method for power supply system - Google Patents
Output overvoltage detection protecting method for power supply system Download PDFInfo
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Abstract
The invention relates to a power system output over voltage detecting protector. It uses the control detecting circuit to detect the output voltage of the power module to quote weather it is greater than the first basic voltage and detect switch pipe driving pulse or the relative parameter of the power converter of the power module to quote weather it inputs the driving pulse to the switch pipe, if the two result are yes, it quotes that the power module outputs the over voltage barrier and generates a over voltage protecting signal to lock the output.
Description
Technical field
The present invention relates to the over-voltage protection technology of power-supply system, more particularly, relate to a kind of output overvoltage detection protecting method of power-supply system.
Background technology
Output over-voltage protection is an important technology requirement of power-supply system.Existing method is to be sampled by the electric power source pair of module output voltage; if output voltage is higher than a certain predetermined value; just export a guard signal, the main circuits such as power inverter of this power module are quit work (this moment, the part control circuit of this power module still worked on).Because the too high voltage of output may damage the back level equipment of power module, so, when output overvoltage occurring, generally adopt locked (after locked, need manual intervention to handle, this power module could continue to devote oneself to work) mode to realize overvoltage protection.
But,,, then can produce a tangible performance deficiency if each power module all carries out output over-voltage protection with aforesaid way for the power-supply system of forming by a plurality of power modules.Be the schematic diagram of a power-supply system as shown in Figure 1, wherein form power-supply system by a plurality of power modules, each power module is by the functions such as hot plug of relay realization output, and the output of each power module is by the dc bus parallel connection on right side, to power to the load.For this power-supply system; if one of them power module has been exported too high voltage; because the output of all power modules all is connected in parallel on the dc bus; consequently all can to detect output voltage too high for all power modules; if still adopt the locked means of traditional usefulness to realize output over-voltage protection; then all power modules all can finally can be caused whole power-supply system all by locked, again output voltage by locked.
In actual moving process, the probability of power module generation output overvoltage fault is less than the other types fault takes place, so the processing of output overvoltage fault is often dropped on outside design engineer and service engineer's the concern scope.But in case this fault takes place, power-supply system is operate as normal again, whole power-supply system power down, thus the load that causes being attached thereto quits work, and user's business function is ended, and as seen, the consequence that this fault is brought is serious.Because all outer usually storage battery that has of this power-supply system that composes in parallel by a plurality of power modules, so that powering load reliably still when exchanging power down, and then guarantee that business function is normal, so the harm that above-mentioned fault is brought does not have by industry and is fully recognized that.
One, one of scheme of prior art
When solving power system failure, common standard is that the business function that guarantees the user is not ended, therefore the most frequently used scheme is a tyre storage battery on the bus of power-supply system, so, even fault has taken place power-supply system is quit work, also can be powered by storage battery, user's business function can also be kept several hrs temporarily, as long as guarantee to have before storage battery has been put electricity manual intervention to make power-supply system recover operate as normal.But this scheme has a lot of weak points in actual applications:
(1) not all power-supply system all also can be gone into network, for the power-supply system of not incorporating network into, its fault can't be reported to the center monitoring station by network, so can only adopt regular people is the working condition that the mode of patrolling and examining is checked this power-supply system, therefore, for the power-supply system of not incorporating network into, in case the output overvoltage fault takes place, the scheme of external storage battery can't guarantee that usually power-supply system still keeps operate as normal when manual inspection is arranged.
(2) not all power module can both be with the failure condition (output overvoltage, under-voltage of self, PFC overvoltage, under-voltage etc.) and the safeguard measure classification report, therefore, the service engineer can't confirm to take place the urgency level of the power-supply system needs on-site maintenance of fault according to the fault type of the actual generation of power module, that is to say, when the output overvoltage fault takes place, can not guarantee in effective time, in time to be safeguarded; And, even can classifying, power module reports, the actual time of finishing maintenance also can be subjected to the traffic of website region, power-supply system place, the influence that the attendant disposes factors such as quantity, so also can't guarantee to obtain on-call maintenance before the tyre storage battery has been put electricity.
(3) adopt the scheme of storage battery in addition, can make user's electric power system structure unification, must be that the power-supply system that a plurality of power modules compose in parallel adds the electric power system structure of storage battery in addition, and the cost of this electric power system structure is quite high, wherein storage battery is the most flimsy assembly in the electric power system, and the dispersed placement utmost point of storage battery also is unfavorable for the maintenance of storage battery
Two, two of the scheme of present technology
In this scheme, be to guarantee the power-supply system normal power supply by the measure that allows the trouble power module break away from power-supply system, as shown in Figure 2, what take usually in the prior art is to top diode scheme, because the characteristic of the unidirectional conducting of diode, the power module that the output overvoltage fault takes place can be passed to its voltage on the bus of power-supply system, but the overvoltage on the bus can't be poured in down a chimney to the normal power source inside modules, so, if the output voltage sampled point of power module is placed on (being the left side of diode in Fig. 2) before the diode of top, then normal power module just can not detect the information of output overvoltage.Though this scheme is simple, but diode wherein is to be added on the main power circuit, therefore need to adopt power diode, its power loss is very big, but also need to increase extra radiator, the volume that this not only can significantly increase whole power-supply system lowers efficiency, and can reduce the reliability of power module because the temperature that the increase of power module internal loss causes rises relatively.
Three, three of the scheme of prior art
In this scheme, also be to guarantee the power-supply system normal power supply, and take all factors into consideration and efficiency factor by the measure that allows the trouble power module break away from power-supply system.Wherein, when detecting output voltage and exceed standard, disconnect release unit (being relay) immediately in Fig. 1; Disconnect after the release unit, it is normal that the output voltage of normal power source module can recover, and the output voltage of trouble power module still exceeds standard, can identify the power module that fault has taken place in view of the above, then, for the trouble power module, then turn-off its main power circuit, for the normal power source module, then closed again its release unit restores electricity whole power-supply system.
The advantage of this scheme is efficient and the reliability in the time of can not influencing the power-supply system operate as normal, and can identify the trouble power module and make it disengaging from power-supply system, to recover the power-supply system normal power supply.Its shortcoming is, if power-supply system is the tyre storage battery not, at the release unit of all power modules off period all, power-supply system can be in power-down state, user's business function can temporarily be interrupted, after the time-delay of 10mS level, the trouble power module breaks away from approximately, and power-supply system just can be recovered normal power supply again.
Summary of the invention
At the above-mentioned defective of prior art, the present invention will solve when adopting traditional output over-voltage protection method the problem that storage battery in addition could guarantee the continued power of finite time, with the more reliable output over-voltage protection of realization.
The technical solution adopted for the present invention to solve the technical problems is: the output overvoltage detection protecting method that a kind of power-supply system is provided; comprise a plurality of power modules parallel with one another in the described power-supply system; wherein; at each power module, realize according to the following steps that by the control circuit of this power module inside output overvoltage detects protection:
(S1) detect the output voltage of this power module, and judge that whether the output voltage that detects gained is greater than first reference voltage;
(S2) detect the driving pulse of the switching tube in the power inverter of this power module or the parameter relevant, whether have driving pulse to be input to described switching tube with direct or indirect judgement with described driving pulse;
(S3) if the result of determination of described step (S1), (S2) is all for being to judge that then the output overvoltage fault has taken place this power module.
In the method for the present invention,,, then also comprise producing the step that an overvoltage protection signal reports with locked its output and realization fault if the output overvoltage fault has taken place in judgement this its in described step (S3) at each power module.
In the method for the present invention; at each power module; also comprise and judge that whether the output voltage that detects gained in the described step (S1) is greater than second reference voltage; if then directly produce an overvoltage protection signal with the output of locked this power module and realize the step that fault reports, wherein said second reference voltage is greater than first reference voltage.
In the described step (S2) of the method for the invention, can directly detect the drive pulse signal that is input to switching tube; Also can detect the output level of the Voltage loop in this power module,, be judged to be no driving pulse if it is lower than described predetermined level if it is higher than a predetermined level then has been judged to be driving pulse; Also can detect the former limit of the power inverter in this power module or the pulse voltage of secondary winding, if it is higher than a predetermined pulse voltage then has been judged to be driving pulse, if it is lower than described predetermined pulse voltage then is judged to be no driving pulse; Also can detect the former limit of the power inverter in this power module or the pulsating current of secondary winding, if it is higher than a predetermined pulsating current then has been judged to be driving pulse, if it is lower than described predetermined pulsating current then is judged to be no driving pulse; Also can detect the output current in this power module,, be judged to be no driving pulse if it is lower than described scheduled current if it is higher than a scheduled current then has been judged to be driving pulse.
By such scheme as can be known, the present invention judges by detecting output voltage and switching tube driving pulse (or closely-related with it parameter) simultaneously whether arbitrary power module the output overvoltage fault has taken place, have only when output voltage exceeds standard and still have driving pulse, just be judged to be this power module the output overvoltage fault has taken place.By this method, can find out the real power module that fault taken place and it is locked exactly, normal power module is then unaffected, thereby can guarantee the operate as normal of whole power-supply system, can not cause whole power-supply system to quit work because of the output overvoltage fault of indivedual power modules, therefore, also can keep normal power supply even without the tyre storage battery.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the schematic diagram of the power-supply system that composed in parallel by a plurality of power modules;
Fig. 2 is by the top diode being realized the schematic diagram of output over-voltage protection in the prior art;
Fig. 3 judges the circuit diagram whether power module breaks down by detecting output voltage and Voltage loop output level in the one embodiment of the invention.
Embodiment
For single power module, when detecting output voltage when too high, implement output over-voltage protection and also complain to fault, be ripe prior art.Power inverter in power module certainly exists a Voltage loop, and this Voltage loop may be PWM (pulse-width modulation) control, PFM (pulse frequency modulated) controls or both use with.If output voltage is higher than the predetermined value that Voltage loop sets, then Voltage loop meeting output low level stops to export the switching tube driving pulse, forbids power module copped wave work, to reach the purpose that reduces output voltage.So if Voltage loop is normal, then the voltage source module can realize voltage stabilizing output fully, the fault of output overvoltage can not occur.But, if itself has sent out fault Voltage loop, for example the line as voltage sample has broken, even then this moment, output voltage was higher than predetermined value, Voltage loop still can be exported high level, switching tube still can be received driving pulse, power module copped wave work still, and will produce this moment can not be from the output overvoltage of dynamic(al) correction.
In power-supply system shown in Figure 1, the output of each power module directly is connected in parallel on the bus by lead (as copper bar, mode that large tracts of land PCB copper sheet constant resistance is very little), makes that the output of each power module is directly in parallel on bus.For this power-supply system, judge whether some power modules produce the output overvoltage fault, the one, see that total output voltage surpasses first reference value, the 2nd, see that the switching tube of this power module is still received driving pulse, if both result of determination are all for being that then this power module of decidable breaks down.For the power module of non-fault, when detecting output voltage above first reference value, its Voltage loop meeting output low level is through stopping to export the switching tube driving pulse, so its switching tube can not received driving pulse again.
Among the present invention, just be based on above-mentioned basis,, judging the operating state that power module is real by detecting output voltage and driving pulse simultaneously.For arbitrary power module, when detecting output voltage above first reference value and driving pulse simultaneously, think that then output overvoltage fault has taken place for it, just produce guard signal this moment, locked output, this moment, this power module can not be equivalent to break away from whole power-supply system to the bus output voltage; When detecting that output voltage surpasses first reference value but when not having driving pulse, then be judged to be the output overvoltage fault does not take place.
During concrete enforcement, very simple for the detection of output voltage, as long as the output voltage on the detection bus compares itself and preset first reference value again, just can determine whether output voltage surpasses first reference value.
For the detection of driving pulse, then numerous embodiments can be arranged.
1, directly detects the driving pulse of power module
Power module with PWM control is an example, and when the power module operate as normal, its Voltage loop should be exported driving pulse; For power-supply system shown in Figure 1, when a certain power module fault makes that total output voltage surpasses first reference value, that power module of fault still has driving pulse, and normal power module can make its Voltage loop output low level above first reference value because of detecting output voltage, finally stops to export driving pulse.So, when specifically implementing, can utilize one of its frequency characteristic, peak electricity equality characteristic by gathering the driving pulse of switching tube in the power module, judge whether power module has driving pulse to be input to switching tube.
2, come indirect judgement whether driving pulse is arranged by the output level that detects Voltage loop
By aforementioned content as can be known, when Voltage loop output high level, driving pulse output is arranged; When the Voltage loop output low level, then there is not driving pulse output.So, can come indirect judgement whether driving pulse is arranged by the output level that detects Voltage loop.With the Voltage loop in the PWM control is example, and when the power module operate as normal, the output level of Voltage loop should be high level; For power-supply system shown in Figure 1, when a certain power module fault makes that total output voltage surpasses first reference value, the Voltage loop output level of that power module of fault is a high level, and normal power module can make its Voltage loop output level become low level above first reference value because of detecting output voltage.As seen, can come indirect judgement whether driving pulse is arranged,, be judged to be no driving pulse if it is lower than this predetermined level if it is higher than a predetermined level then has been judged to be driving pulse by the output level that detects Voltage loop.
Be illustrated in figure 3 as the circuit diagram of a specific embodiment, it is the symmetrical half bridge (not marking among the figure) of the chip controls of SG3525 that wherein main power inverter adopts by model.Vol wherein is the output voltage sampled point that output overvoltage detects protective circuit; 1V875 ref be the power module inner setting a reference voltage (for example; the voltage of 1V875 ref is 1.875V), 3525 COMP are output signals of Voltage loop in the power module.
When having the power module output voltage to exceed standard in the power-supply system shown in Figure 1, each power module in parallel all may detect output voltage and exceed standard, thereby makes output (OUTPUT-OV) the output high level of operational amplifier U206DA.
For normal power module, because detecting output voltage, Voltage loop exceeds first reference value, so its 3525 COMP signal is a low level, be 0V herein, this makes the output output low level of operational amplifier U501A, this moment maskable operational amplifier U206DA the high level of output (OUTPUT-OV) signal, make the normal phase input end of operational amplifier U501B still be low level, therefore also output low level of the output (FAIL) of operational amplifier U501B represents that this power module is for normal.
Power module for fault, its Voltage loop output level remains high level, so 3525 COMP signals still are higher than 0.5V, therefore the output of operational amplifier U501A can be exported high level, the high level of output (OUTPUT-OV) signal of operational amplifier U206DA can pass to the positive output end of operational amplifier U501B at this moment, make output (FAIL) the output high level of operational amplifier U501B, represent that this power module is a fault, and locked shutoff is turn-offed the output of malfunctioning module, while reporting module fault.
3, come indirect judgement whether driving pulse is arranged by the pulse voltage that detects the secondary winding of converter in the power module
During concrete enforcement, can directly detect the pulse voltage of secondary winding, also can detect by auxiliary winding.Power module with PWM control is an example, and when the power module operate as normal, can there be pulse voltage in the secondary winding; For power-supply system shown in Figure 1, when a certain power module fault made that total output voltage surpasses first reference value, therefore normal power module can close driving pulse, so the secondary winding does not just have pulse voltage yet.The secondary winding of that power module of fault then still has pulse voltage.During concrete enforcement, can be by gathering the pulse voltage of converter secondary winding in the power module, utilize one of its frequency characteristic, peak electricity equality characteristic, come indirect judgement whether driving pulse is arranged, if it is higher than a predetermined pulse voltage then has been judged to be driving pulse, if it is lower than this predetermined pulse voltage then is judged to be no driving pulse.
In addition, also can come indirect judgement whether driving pulse is arranged with signal that the driving pulse of switching tube is closely related, for example the pulse voltage of the former limit of pulsating current, the converter winding by the former and deputy limit of detection winding etc. by detecting in the power module other.
In addition, also can come indirect judgement whether driving pulse is arranged by the output current that detects this power module,, be judged to be no driving pulse if it is lower than described scheduled current if it is higher than a scheduled current then has been judged to be driving pulse.This is because when a certain power module fault makes that total output voltage surpasses first reference value, that power module of fault still has output voltage and output current, and normal power module can stop to export driving pulse above first reference value because of detecting output voltage, does not just have electric current output again.
As seen, everyly whether can be used for characterizing this power module, all can be used for and the output voltage phase structure that whether exceeds standard, whether the output overvoltage fault has taken place to judge this power module still in the parameter of work.
During concrete enforcement, a secondary also can be set again cross pressure point, promptly set one second fiducial value, it should be greater than first reference value.When arbitrary power module detects output voltage and is higher than second fiducial value, no matter whether still have driving pulse in the power module, all locked this power module.When this thing happens; due effect is not all played in the overvoltage protection measure of expression front; the power module of fault is not by locked; output voltage is still continuing rising; can only thoroughly turn off whole power-supply system this moment in this way; so just can avoid further improving the reliability of power-supply system owing to the too high and issuable abnormal conditions of output voltage.
Claims (8)
1, a kind of output overvoltage detection protecting method of power-supply system; comprise a plurality of power modules parallel with one another in the described power-supply system; it is characterized in that,, realize according to the following steps that by the control circuit of this power module inside output overvoltage detects protection at each power module:
(S1) detect the output voltage of this power module, and judge that whether the output voltage that detects gained is greater than first reference voltage;
(S2) detect the driving pulse of the switching tube in the power inverter of this power module or the parameter relevant, whether have driving pulse to be input to described switching tube with direct or indirect judgement with described driving pulse;
(S3) if the result of determination of described step (S1), (S2) is all for being to judge that then the output overvoltage fault has taken place this power module.
2, the output overvoltage detection protecting method of power-supply system according to claim 1; it is characterized in that; at each power module; if judge that in described step (S3) the output overvoltage fault has taken place this power module, then also comprise producing the step that an overvoltage protection signal reports with locked its output and realization fault.
3, the output overvoltage detection protecting method of power-supply system according to claim 2; it is characterized in that; at each power module; also comprise and judge that whether the output voltage that detects gained in the described step (S1) is greater than second reference voltage; if then directly produce an overvoltage protection signal with the output of locked this power module and realize the step that fault reports, wherein said second reference voltage is greater than first reference voltage.
4, according to the output overvoltage detection protecting method of each described power-supply system among the claim 1-3, it is characterized in that, in described step (S2), directly detect the drive pulse signal that is input to switching tube.
5, according to the output overvoltage detection protecting method of each described power-supply system among the claim 1-3; it is characterized in that; in described step (S2); detect the output level of the Voltage loop in this power module; if it is higher than a predetermined level then has been judged to be driving pulse,, it is judged to be no driving pulse if being lower than described predetermined level.
6, according to the output overvoltage detection protecting method of each described power-supply system among the claim 1-3; it is characterized in that; in described step (S2); detect the former limit of the power inverter in this power module or the pulse voltage of secondary winding; if it is higher than a predetermined pulse voltage then has been judged to be driving pulse, if it is lower than described predetermined pulse voltage then is judged to be no driving pulse.
7, according to the output overvoltage detection protecting method of each described power-supply system among the claim 1-3; it is characterized in that; in described step (S2); detect the former limit of the power inverter in this power module or the pulsating current of secondary winding; if it is higher than a predetermined pulsating current then has been judged to be driving pulse, if it is lower than described predetermined pulsating current then is judged to be no driving pulse.
8, according to the output overvoltage detection protecting method of each described power-supply system among the claim 1-3; it is characterized in that; in described step (S2); detect the output current in this power module; if it is higher than a scheduled current then has been judged to be driving pulse,, it is judged to be no driving pulse if being lower than described scheduled current.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100375554A CN100464477C (en) | 2005-09-23 | 2005-09-23 | Output overvoltage detection protecting method for power supply system |
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| CNB2005100375554A CN100464477C (en) | 2005-09-23 | 2005-09-23 | Output overvoltage detection protecting method for power supply system |
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| CN100464477C CN100464477C (en) | 2009-02-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102244378A (en) * | 2010-05-11 | 2011-11-16 | 立锜科技股份有限公司 | Device and method for protecting IC (integrated circuit) |
| CN103080759A (en) * | 2010-09-10 | 2013-05-01 | 三菱电机株式会社 | Overvoltage detecting device for energy storage module |
| CN107134754A (en) * | 2016-02-29 | 2017-09-05 | 中兴通讯股份有限公司 | A kind of output over-voltage protection method and device of power parallel machine system |
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| US5532894A (en) * | 1994-07-11 | 1996-07-02 | Minnesota Mining And Manufacturing Company | Overvoltage protection circuit |
| KR200204874Y1 (en) * | 1997-04-14 | 2001-01-15 | 윤종용 | Switching mode power supply with transient voltage stabilization circuit |
| US6278597B1 (en) * | 1999-10-05 | 2001-08-21 | International Business Machines Corporation | Conditional over-voltage protection for redundant phase-shift converters |
| CN2447976Y (en) * | 2000-04-19 | 2001-09-12 | 徐晓亮 | Over-voltage protection trigger circuit for silicon controlled parallel inverse mid-frequency power supply |
| CN2442439Y (en) * | 2000-08-04 | 2001-08-08 | 集大成企业有限公司 | Pulse type charger |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102244378A (en) * | 2010-05-11 | 2011-11-16 | 立锜科技股份有限公司 | Device and method for protecting IC (integrated circuit) |
| CN102244378B (en) * | 2010-05-11 | 2015-06-10 | 立锜科技股份有限公司 | Device and method for protecting IC (integrated circuit) |
| CN103080759A (en) * | 2010-09-10 | 2013-05-01 | 三菱电机株式会社 | Overvoltage detecting device for energy storage module |
| CN107134754A (en) * | 2016-02-29 | 2017-09-05 | 中兴通讯股份有限公司 | A kind of output over-voltage protection method and device of power parallel machine system |
| WO2017148238A1 (en) * | 2016-02-29 | 2017-09-08 | 中兴通讯股份有限公司 | Output over-voltage protection method and device for power source parallelized system, and storage medium |
| CN107134754B (en) * | 2016-02-29 | 2020-07-31 | 南京中兴软件有限责任公司 | Output overvoltage protection method and device of power supply parallel operation system |
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| CN100464477C (en) | 2009-02-25 |
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Effective date of registration: 20140903 Address after: 518101 Guangdong city of Shenzhen province Baoan District Xin'an road two North 68 Street office Honglang District Industrial Park plant Patentee after: Astec power supply (Shenzhen) Co., Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee before: Aimosheng Network Energy Source Co., Ltd. |