CN105305796A - Frequency converter direct-current busbar overvoltage and under-voltage protection method and system - Google Patents
Frequency converter direct-current busbar overvoltage and under-voltage protection method and system Download PDFInfo
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- CN105305796A CN105305796A CN201510660573.1A CN201510660573A CN105305796A CN 105305796 A CN105305796 A CN 105305796A CN 201510660573 A CN201510660573 A CN 201510660573A CN 105305796 A CN105305796 A CN 105305796A
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Abstract
The embodiment of the invention discloses a frequency converter direct-current busbar overvoltage and under-voltage protection method and system. The method includes the following steps that: reference voltage Vref is obtained; voltage V1 and voltage V2 are extracted from the voltage of a direct-current busbar respectively according to different proportions, overvoltage judgment voltage and under-voltage judgment voltage are determined according to the magnitude of the voltage V1 and voltage V2; the overvoltage judgment voltage and under-voltage judgment voltage are compared with the reference voltage Vref respectively, and comparison results are obtained; and the comparison results are inputted to an optical coupler, and protection signals are outputted and are transmitted to a controller, so that processing can be carried out, and therefore, a frequency converter can be protected. According to the method and system of the invention, the comparison results are inputted to the optical coupler, so that the switching on or switching off of the optical coupler can be directly controlled, if the voltage of the direct-current busbar is normal, when the optical coupler is switched on, no signals are outputted, and if the direct-current busbar is in an under-voltage state or an overvoltage state, the optical coupler is switched off, and processing signals are outputted and are transmitted to the controller, so that processing can be carried out, and therefore, when the direct-current busbar is in an under-voltage state or an overvoltage state, the frequency converter can be effectively protected, and the normal operation of the frequency converter can be guaranteed.
Description
Technical field
The present invention relates to frequency converter resist technology field, particularly relate to a kind of guard method and system of frequency changer direct current bus overvoltage/undervoltage.
Background technology
Frequency converter is a kind of more common speed control device, manufacture field at new-energy automobile especially electric motor car to have a very wide range of applications, the functions such as the soft start to motor, frequency control, raising rotary speed precision and power factor (PF) can be realized, therefore very high to the security requirement of frequency converter.For frequency converter, frequency changer direct current bus voltage directly affects the work of frequency converter, and frequency changer direct current bus overtension can cause damage to the power component of its inside, and frequency converter may be caused to explode; DC bus-bar voltage is too low, can produce overcurrent, burn out frequency converter, so the protection of DC bus overvoltage/undervoltage is the important leverage that frequency converter is able to trouble free service.
In prior art, frequency changer direct current bus overvoltage/undervoltage protection general only dependence AD sampling, detected DC bus-bar voltage, by after resistance step-down sampling, drops on the scope that can detect, thus passes through the fault alarm scope of software program setting voltage.Or fixed the voltage of comparator one end by precision voltage source chip, comparing with it after detected DC bus-bar voltage sampling, result is exported by comparator.
But existing guard method depends on protect IC, if protect IC is once break down, the overvoltage/undervoltage defencive function on chip can lose efficacy, and likely makes power component damage, and causes frequency converter normally to work.
Summary of the invention
Provide a kind of guard method and system of frequency changer direct current bus overvoltage/undervoltage in the embodiment of the present invention, during to solve frequency changer direct current bus overvoltage/undervoltage in prior art, utilize the problem that chip is unstable to frequency converter protection.
In order to solve the problems of the technologies described above, the embodiment of the invention discloses following technical scheme:
A guard method for frequency changer direct current bus overvoltage/undervoltage, described method comprises:
Obtain a reference voltage VREF;
Two voltage V1 and V2 are extracted respectively according to different ratios from DC bus-bar voltage;
Determine that an overvoltage judges voltage and under-voltage judgement voltage according to the size of described voltage V1 and V2;
Described overvoltage is judged voltage and under-voltage judgement voltage compare with described reference voltage VREF respectively, obtain comparative result;
Described comparative result input optocoupler output protection signal, send into controller process, protection frequency converter.
Preferably, describedly extract two voltage V1 and V2 from DC bus-bar voltage respectively according to different ratios, comprising:
Obtain the voltage V of described DC bus;
Two different voltage V1 and V2 are extracted according to different ratios.
Preferably, the described size according to described voltage V1 and V2 determines that an overvoltage judges voltage and a under-voltage judgement voltage, comprising:
Comparative voltage V1 and V2 size;
If described voltage V1 is greater than V2, then V1 is under-voltage judgement voltage, and V2 is that overvoltage judges voltage;
Or,
If described voltage V1 is less than V2, then V1 is that overvoltage judges voltage, and V2 is under-voltage judgement voltage.
Preferably, describedly overvoltage is judged voltage and under-voltage judgement voltage compare with described reference voltage VREF respectively, obtains comparative result, comprising:
Described under-voltage judgement voltage is compared with described reference voltage VREF, obtains under-voltage comparative result;
Described overvoltage is judged voltage compares with described reference voltage VREF, obtain overvoltage comparative result;
Preferably, described comparative result input optocoupler output processing signal, comprising:
Described under-voltage judgement voltage and described reference voltage VREF comparative result are connect photoelectrical coupler anode;
Described overvoltage is judged voltage and described reference voltage VREF comparative result connect photoelectrical coupler negative electrode;
If DC bus is under-voltage or overvoltage, described photoelectrical coupler cut-off, output processing signal.
A protection system for frequency changer direct current bus overvoltage/undervoltage, described system comprises:
Acquisition module, for obtaining a reference voltage VREF;
Electric resistance partial pressure module, for extracting two voltage V1 and V2 from DC bus-bar voltage respectively according to different ratios;
Judging treatmenting module, for determining that according to the size of described voltage V1 and V2 an overvoltage judges voltage and under-voltage judgement voltage;
Relatively processing module, judges that by described overvoltage voltage and under-voltage judgement voltage compare with described reference voltage VREF respectively, obtains comparative result;
Protection output module, for by described comparative result input optocoupler and output protection signal, sends into controller process, protection frequency converter.
Preferably, described electric resistance partial pressure module comprises overvoltage and judges voltage resistance partial pressure unit and under-voltage judgement voltage resistance partial pressure unit, wherein:
Described overvoltage judges voltage resistance partial pressure unit, judges voltage for obtaining described overvoltage;
Described under-voltage judgement voltage resistance partial pressure unit, for obtaining described under-voltage judgement voltage.
Preferably, the described processing module that compares comprises under-voltage comparator and overvoltage comparator,
Described under-voltage comparator, for exporting under-voltage judgement signal, the input of described under-voltage comparator inputs described under-voltage judgement voltage and described reference voltage VREF respectively;
Described overvoltage comparator, judges signal for output overvoltage, and the input of described overvoltage comparator inputs described overvoltage respectively and judges voltage and described reference voltage VREF.
Preferably, described protection output module comprises photoelectrical coupler,
Described photoelectrical coupler, for output processing signal, is transferred to controller process, protection frequency converter;
The anode of the output termination photoelectrical coupler of described under-voltage comparator, the negative electrode of the output termination photoelectrical coupler of described overvoltage comparator.
From above technical scheme, the guard method of a kind of frequency changer direct current bus overvoltage/undervoltage that the embodiment of the present invention provides and system, comprise: obtain a reference voltage VREF, two voltage V1 and V2 are extracted respectively according to different ratios from DC bus-bar voltage, determine that an overvoltage judges voltage and under-voltage judgement voltage according to the size of described voltage V1 and V2, described overvoltage is judged voltage and under-voltage judgement voltage compare with described reference voltage VREF respectively, obtain comparative result, described comparative result input optocoupler output protection signal, send into controller process, protection frequency converter.Two voltage V1 and V2 according to extracting determine that overvoltage judges voltage and under-voltage judgement voltage, compare respectively, export two comparative results with described reference voltage VREF.Described comparative result input optocoupler, directly controls conducting or the cut-off of photoelectrical coupler, if DC bus-bar voltage is normal, during photoelectrical coupler conducting, no signal exports; If DC bus overvoltage/undervoltage, photoelectrical coupler cut-off output protection signal, sends into controller process, like this can available protecting frequency converter when DC bus overvoltage/undervoltage, ensures that frequency converter normally works.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, for those of ordinary skills, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The schematic flow sheet of the guard method of a kind of frequency changer direct current bus overvoltage/undervoltage that Fig. 1 provides for the embodiment of the present invention;
A kind of method flow schematic diagram obtaining overvoltage, under-voltage judgement voltage that Fig. 2 provides for the embodiment of the present invention;
A kind of schematic flow sheet exporting overvoltage/undervoltage comparative result that Fig. 3 provides for the embodiment of the present invention;
The structural representation of the protection system of a kind of frequency changer direct current bus overvoltage/undervoltage that Fig. 4 provides for the embodiment of the present invention;
The structural representation of the protective circuit of a kind of frequency changer direct current bus overvoltage/undervoltage that Fig. 5 provides for the embodiment of the present invention.
Embodiment
Technical scheme in the present invention is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
See Fig. 1, the schematic flow sheet of the guard method of a kind of frequency changer direct current bus overvoltage/undervoltage provided for the embodiment of the present invention, described method comprises:
Step S100: obtain a reference voltage VREF;
Obtain reference voltage VREF time, reference voltage VREF we can according to actual conditions sets itself, the value that such as we can get reference voltage is 10V, can certainly get other values, do not enumerate at this according to different frequency converters.
Step S200: extract two voltage V1 and V2 respectively according to different ratios from DC bus-bar voltage;
Because frequency changer direct current bus voltage is normal within the specific limits, get two magnitudes of voltage that normal range (NR) two ends are adjacent, we are defined as voltage V10 and V20, the pantograph ratio then obtaining two voltages is VREF/V10 and VREF/V20, because frequency converter busbar voltage changes always, will gather constantly the voltage of frequency changer direct current bus, the definite value during value gathered each time, be defined as V, V be multiplied by respectively voltage scaling than VREF/V10 and VREF/V20, obtain voltage V1 and V2.
Such as, the normal range value of frequency changer direct current bus voltage is 300V-400V, we arrange under-voltage some V10=300V, cross pressure point V20=400V, that suppose VREF we get is 10V, the pantograph ratio so obtaining two voltages is 10/300 and 10/400, if a certain moment, our the frequency changer direct current bus magnitude of voltage that collects was 450V, the pantograph ratio so 450V being multiplied by respectively two voltages is 10/300 and 10/400, obtain V1=15V, V2=11.25V, certain V1 and V2 changes constantly, because the voltage of the frequency changer direct current bus that each moment obtains also is different.
Step S300: determine that an overvoltage judges voltage and under-voltage judgement voltage according to the size of described voltage V1 and V2;
Determine that overvoltage judges that the process of voltage and under-voltage judgement voltage is concrete as shown in Figure 2: voltage V1 and V2 size in comparison step S200, if described voltage V1 is greater than V2, then V1 is under-voltage judgement voltage, V2 is that overvoltage judges voltage, or, if described voltage V1 is less than V2, then V1 is that overvoltage judges voltage, and V2 is under-voltage judgement voltage.
If as in step S200 the voltage V1=15V of acquisition that illustrates, V2=11.25V, so we compare the size of V1 and V2, and the magnitude of voltage of V1 is greater than the magnitude of voltage of V2 obviously, therefore voltage V1 is under-voltage judgement voltage, and voltage V2 is overvoltage and judges voltage.
Obtain above-mentioned judged result, if the magnitude of voltage being based on the minimum voltage V2 obtained is greater than the magnitude of voltage of the reference voltage VREF obtained in step S100, described reference voltage VREF is the judgment value that we define, described reference voltage VREF should between minimum voltage and maximum voltage under normal circumstances, frequency changer direct current bus voltage is only normal range (NR), the magnitude of voltage of V2 should be less than the magnitude of voltage of reference voltage VREF under normal circumstances, therefore the magnitude of voltage of voltage V2 is greater than the magnitude of voltage of reference voltage VEREF, we just can judge frequency changer direct current bus under-voltage, if when in like manner the value of voltage V1 is less than the magnitude of voltage of described reference voltage VREF, we can judge frequency changer direct current bus overvoltage,
Because the value of voltage V1 and V2 that in reality, we obtain is not limited only to above-mentioned numerical value, because according to the DC bus-bar voltage gained obtained in reference voltage, the deficient overvoltage point value chosen and reality during the value of V1 and V2.
Step S400: described overvoltage is judged voltage and under-voltage judgement voltage compare with described reference voltage VREF respectively, obtain comparative result, detailed process is:
As shown in Figure 3, voltage and described under-voltage judgement voltage and described reference voltage VREF compare to select described overvoltage to judge respectively, obtain overvoltage comparative result and under-voltage comparative result respectively.
If first defined, overvoltage judges voltage, under-voltage judgement voltage is less than described reference voltage VREF, and output is 0, if overvoltage judges voltage, under-voltage judgement voltage is greater than described reference voltage VREF, output is 1.
Therefore, if described overvoltage judges that voltage is less than described reference voltage VREF, overvoltage comparative result is 0, and under-voltage judgement voltage is greater than described reference voltage VREF, and under-voltage comparative result is 1; If described overvoltage judges that voltage is greater than described reference voltage VREF, overvoltage comparative result is 1, and under-voltage judgement voltage is greater than described reference voltage VREF, and under-voltage comparative result is 1; If described overvoltage judges that voltage is less than described reference voltage VREF, overvoltage comparative result is 0, and under-voltage judgement voltage is less than described reference voltage VREF, and under-voltage comparative result is 0;
If the voltage V1=15 obtained in step S200, V2=11.25V, in step S100, reference voltage VREF is 10V, voltage and under-voltage judgement voltage is judged in step 300 according to the acquiring size overvoltage of V1 and V2, because voltage V1=15, V2=11.25V, so voltage V1 is under-voltage judgement voltage, voltage V2 is that overvoltage judges voltage, the magnitude of voltage of voltage V2 and the magnitude of voltage of described reference voltage VREF is judged through comparing overvoltage, described overvoltage judges that voltage is greater than described reference voltage VREF, therefore overvoltage comparative result is 1, described under-voltage judgement voltage is also greater than described reference voltage VREF obviously, therefore under-voltage comparative result is also 1.
If the frequency changer direct current bus magnitude of voltage collecting a time point in step S200 is 200V, pantograph ratio is still constant, the V1=20/3V then obtained, V2=5V, more known V1 is greater than V2, so voltage V1 is under-voltage judgement voltage, voltage V2 is that overvoltage judges voltage, the magnitude of voltage of voltage V2 and the magnitude of voltage of described reference voltage VREF is judged through comparing overvoltage, described overvoltage judges that voltage V2 is less than described reference voltage VREF, therefore overvoltage comparative result is 0, more described under-voltage judgement voltage V1 and described reference voltage VREF after people, described under-voltage judgement voltage V1 is less than described reference voltage VREF, therefore under-voltage comparative result is also 0.
Step S500: described comparative result input optocoupler output protection signal, sends into controller process, protection frequency converter.
We define DC bus-bar voltage normal time, under-voltage Output rusults is 1, and overvoltage Output rusults is 0; described under-voltage Output rusults is connect photoelectrical coupler anode; overvoltage Output rusults connects photoelectrical coupler negative electrode, now photoelectrical coupler conducting, and controller can not receive guard signal.
If when DC bus-bar voltage is under-voltage, under-voltage Output rusults is 0, and overvoltage Output rusults is 0, and now photoelectrical coupler is in cut-off state, and controller can receive guard signal, and prompting DC bus is under-voltage, protection frequency converter.
If during DC bus-bar voltage overvoltage, under-voltage Output rusults is 1, and overvoltage Output rusults is 1, and now photoelectrical coupler is in cut-off state, and controller can receive guard signal, the overvoltage of prompting DC bus, protection frequency converter.
The measure of concrete protection frequency converter comprises, and regulates the voltage of frequency changer direct current bus input, makes frequency changer direct current bus voltage arrive a normal value; Or frequency converter is temporarily quit work, prevent frequency converter from burning out.
As seen from the above-described embodiment, the guard method of a kind of frequency changer direct current bus overvoltage/undervoltage that the above embodiment of the present invention provides, comprise: extract two voltage V1 and V2 from DC bus-bar voltage respectively according to different ratios, obtain a reference voltage VREF, determine that an overvoltage judges voltage and under-voltage judgement voltage according to the size of described voltage V1 and V2, described overvoltage is judged voltage and under-voltage judgement voltage compare with described reference voltage VREF respectively, obtain comparative result, described comparative result input optocoupler output protection signal, send into controller process, protection frequency converter.Two voltage V1 and V2 according to extracting determine that overvoltage judges voltage and under-voltage judgement voltage, compare respectively, export two comparative results with described reference voltage VREF.Described comparative result input optocoupler, directly controls conducting or the cut-off of photoelectrical coupler, if DC bus-bar voltage is normal, during photoelectrical coupler conducting, no signal exports; If DC bus overvoltage/undervoltage, photoelectrical coupler cut-off output protection signal, sends into controller process, like this can available protecting frequency converter when DC bus overvoltage/undervoltage, ensures that frequency converter normally works.
Corresponding with the guard method embodiment of a kind of frequency changer direct current bus overvoltage/undervoltage provided by the invention, present invention also offers a kind of protection system of frequency changer direct current bus overvoltage/undervoltage.
See Fig. 4, the structural representation of the protection system of a kind of frequency changer direct current bus overvoltage/undervoltage provided for the embodiment of the present invention, described system comprises:
Electric resistance partial pressure module 101, for extracting two voltage V1 and V2 from DC bus-bar voltage respectively according to different ratios; Described electric resistance partial pressure module 101 comprises overvoltage and judges voltage resistance partial pressure unit and under-voltage judgement voltage resistance partial pressure unit; Described overvoltage judges voltage resistance partial pressure unit, judges voltage for obtaining described overvoltage; Described under-voltage judgement voltage resistance partial pressure unit, for obtaining described under-voltage judgement voltage.
Circuit as shown in Figure 5, electric resistance partial pressure comprises R1, R2, R3, R4, R5 and R6, frequency converter bus connects R1 one end, other end connecting resistance R2 one end of resistance R1, one end of the other end connecting resistance R3 of resistance R2, one end of the other end connecting resistance R5 of the other end connecting resistance R4 of resistance R3, resistance R4 and connect electric capacity C1 one end, another termination GND1 of electric capacity C1; Other end connecting resistance R6 one end of resistance R5 and connect electric capacity C2 one end, another termination GND1 of another termination GND1 of electric capacity C2, resistance R6.
Acquisition module 201, for obtaining a reference voltage VREF;
The acquisition of described reference voltage VREF can with reference to said method embodiment.
Judging treatmenting module 301, for determining that according to the size of described voltage V1 and V2 an overvoltage judges voltage and under-voltage judgement voltage;
Voltage V1 as the protective circuit electric capacity C1 two ends of frequency changer direct current bus overvoltage/undervoltage in Fig. 5 circuit is greater than the value of C2 both end voltage V2, and therefore voltage V1 is under-voltage judgement voltage, and voltage V2 is that overvoltage judges voltage.
Relatively processing module 401, judges that by described overvoltage voltage and under-voltage judgement voltage compare with described reference voltage VREF respectively, obtains comparative result;
The described processing module that compares comprises under-voltage comparator and overvoltage comparator;
Described under-voltage comparator, for exporting under-voltage judgement signal, the input of described under-voltage comparator inputs described under-voltage judgement voltage V1 and described reference voltage VREF respectively;
Described overvoltage comparator, judges signal for output overvoltage, and the input of described overvoltage comparator inputs described overvoltage respectively and judges voltage V2 and described reference voltage VREF.
As the protective circuit of frequency changer direct current bus overvoltage/undervoltage in Fig. 5; if HVDC (DC bus-bar voltage) < (R12+R13+R14+R15+R16+R17) * VREF/ (R16+17); now voltage V1 is less than reference voltage VREF; belong to frequency changer direct current bus under-voltage; therefore under-voltage comparator U1 exports 0, overvoltage comparator U2 and exports 0.
Or, if HVDC> (R12+R13+R14+R15+R16+R17) * VREF/ (R16+17), now voltage V2 is greater than reference voltage VREF, belong to frequency changer direct current bus overvoltage, therefore overvoltage comparator U2 exports 1, under-voltage comparator U1 and exports 1.
Protection output module 501, for by described comparative result input optocoupler and output protection signal, sends into controller process, protection frequency converter;
Circuit as shown in Figure 5; described protection output module comprises resistance R7, photoelectrical coupler U3, resistance R8; one end of described under-voltage comparator output U1 connecting resistance R7; the anode of another termination photoelectrical coupler of resistance R7 U3; the negative electrode of photoelectrical coupler U3 connects the output of overvoltage comparator U2; the emitter of photoelectrical coupler U3 meets GND, the collector electrode of another termination photoelectrical coupler U3 of resistance R8 mono-termination VCC, resistance R8 and as exporting OUT2.
Described photoelectrical coupler U3, for the comparative result according to under-voltage comparator U1 and overvoltage comparator U2, output protection signal, is transferred to controller process, protection frequency converter;
If frequency converter direct current voltage bus voltage is when normal range (NR), it is 1 that under-voltage comparator U1 exports comparison signal, and it is 0 that overvoltage comparator U2 exports comparison signal, and now photoelectrical coupler U3 is conducting, and controller inputs without any signal.
If frequency changer direct current bus is under-voltage; under-voltage comparator U1 exports 0; overvoltage comparator U2 exports 0; or, frequency changer direct current bus overvoltage, overvoltage comparator U2 exports 1; under-voltage comparator U1 exports 1; above-mentioned two situations all can cause photoelectrical coupler U3 to end, and photoelectrical coupler U3 can go out to be defeated by controller by output protection signal, protection frequency converter.
The protective circuit structural representation of a kind of frequency changer direct current bus overvoltage/undervoltage that above-mentioned Fig. 5 provides is only a kind of protective circuit provided, and can also realize corresponding function, do not repeat them here according to the quantity of adjusting resistance value or increase and decrease resistance.
As seen from the above-described embodiment, the protection system of a kind of frequency changer direct current bus overvoltage/undervoltage that the above embodiment of the present invention provides, comprise: electric resistance partial pressure module 101, acquisition module 201, judging treatmenting module 301, relatively processing module 401 and protection output module 501, described electric resistance partial pressure module 101 extracts two voltage V1 and V2 from DC bus-bar voltage respectively according to different ratios, acquisition module 201 obtains a reference voltage VREF, according to the size of described voltage V1 and V2, judging treatmenting module 301 determines that an overvoltage judges voltage and under-voltage judgement voltage, relatively described overvoltage is judged that voltage and under-voltage judgement voltage compare with described reference voltage VREF respectively by processing module 401, obtain comparative result, finally protect output module 501 by described comparative result input optocoupler and output protection signal, send into controller process, protection frequency converter.Described comparative result input optocoupler, directly controls conducting or the cut-off of photoelectrical coupler, if DC bus-bar voltage is normal, during photoelectrical coupler conducting, no signal exports; If DC bus overvoltage/undervoltage, photoelectrical coupler cut-off output protection signal, sends into controller process, like this can available protecting frequency converter when DC bus overvoltage/undervoltage, ensures that frequency converter normally works.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for device or system embodiment, because it is substantially similar to embodiment of the method, so describe fairly simple, relevant part illustrates see the part of embodiment of the method.Apparatus and system embodiment described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
It should be noted that, in this article, the such as relational terms of " first " and " second " etc. and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
The above is only the specific embodiment of the present invention, those skilled in the art is understood or realizes the present invention.To be apparent to one skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (9)
1. a guard method for frequency changer direct current bus overvoltage/undervoltage, is characterized in that, described method comprises:
Obtain a reference voltage VREF;
Two voltage V1 and V2 are extracted respectively according to different ratios from DC bus-bar voltage;
Determine that an overvoltage judges voltage and under-voltage judgement voltage according to the size of described voltage V1 and V2;
Described overvoltage is judged voltage and under-voltage judgement voltage compare with described reference voltage VREF respectively, obtain comparative result;
By described comparative result input optocoupler and output protection signal, send into controller process, protection frequency converter.
2. the guard method of frequency changer direct current bus overvoltage/undervoltage according to claim 1, is characterized in that, describedly extracts two voltage V1 and V2 from DC bus-bar voltage respectively according to different ratios, comprising:
Obtain the voltage V of described DC bus;
Two different voltage V1 and V2 are extracted according to different ratios.
3. the guard method of frequency changer direct current bus overvoltage/undervoltage according to claim 1, is characterized in that, the described size according to described voltage V1 and V2 determines that an overvoltage judges voltage and a under-voltage judgement voltage, comprising:
Comparative voltage V1 and V2 size;
If described voltage V1 is greater than V2, then V1 is under-voltage judgement voltage, and V2 is that overvoltage judges voltage;
Or,
If described voltage V1 is less than V2, then V1 is that overvoltage judges voltage, and V2 is under-voltage judgement voltage.
4. the guard method of frequency changer direct current bus overvoltage/undervoltage according to claim 3, is characterized in that, describedly overvoltage is judged voltage and under-voltage judgement voltage compare with described reference voltage VREF respectively, obtains comparative result, comprising:
Described under-voltage judgement voltage is compared with described reference voltage VREF, obtains under-voltage comparative result;
Described overvoltage is judged voltage compares with described reference voltage VREF, obtain overvoltage comparative result.
5. the guard method of frequency changer direct current bus overvoltage/undervoltage according to claim 4, is characterized in that, described comparative result input optocoupler output processing signal, comprising:
Described under-voltage judgement voltage and described reference voltage VREF comparative result are connect photoelectrical coupler anode;
Described overvoltage is judged voltage and described reference voltage VREF comparative result connect photoelectrical coupler negative electrode;
If DC bus is under-voltage or overvoltage, described photoelectrical coupler cut-off, output protection signal.
6. a protection system for frequency changer direct current bus overvoltage/undervoltage, is characterized in that, described system comprises:
Acquisition module, for obtaining a reference voltage VREF;
Electric resistance partial pressure module, for extracting two voltage V1 and V2 from DC bus-bar voltage respectively according to different ratios;
Judging treatmenting module, for determining that according to the size of described voltage V1 and V2 an overvoltage judges voltage and under-voltage judgement voltage;
Relatively processing module, judges that by described overvoltage voltage and under-voltage judgement voltage compare with described reference voltage VREF respectively, obtains comparative result;
Protection output module, for by described comparative result input optocoupler and output protection signal, sends into controller process, protection frequency converter.
7. the protection system of frequency changer direct current bus overvoltage/undervoltage according to claim 6, is characterized in that, described electric resistance partial pressure module comprises overvoltage and judges voltage resistance partial pressure unit and under-voltage judgement voltage resistance partial pressure unit, wherein:
Described overvoltage judges voltage resistance partial pressure unit, judges voltage for obtaining described overvoltage;
Described under-voltage judgement voltage resistance partial pressure unit, for obtaining described under-voltage judgement voltage.
8. the protection system of frequency changer direct current bus overvoltage/undervoltage according to claim 6, is characterized in that, the described processing module that compares comprises under-voltage comparator and overvoltage comparator,
Described under-voltage comparator, for exporting under-voltage judgement signal, the input of described under-voltage comparator inputs described under-voltage judgement voltage and described reference voltage VREF respectively;
Described overvoltage comparator, judges signal for output overvoltage, and the input of described overvoltage comparator inputs described overvoltage respectively and judges voltage and described reference voltage VREF.
9. the protection system of frequency changer direct current bus overvoltage/undervoltage according to claim 8, is characterized in that, described protection output module comprises photoelectrical coupler,
Described photoelectrical coupler, for output processing signal, is transferred to controller process, protection frequency converter;
The anode of the output termination photoelectrical coupler of described under-voltage comparator, the negative electrode of the output termination photoelectrical coupler of described overvoltage comparator.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107069668A (en) * | 2017-05-03 | 2017-08-18 | 北京索德电气工业有限公司 | A kind of frequency converter failure protection device and frequency converter |
| CN109103850A (en) * | 2018-10-24 | 2018-12-28 | 西安特锐德智能充电科技有限公司 | Storage medium, the short-circuit protection control method of bidirectional power converter, apparatus and system |
| CN109792145A (en) * | 2017-07-31 | 2019-05-21 | 株式会社Lg化学 | The diagnostic system of vehicle electrical systems with DC-DC electric pressure converter and voltage regulator |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201490701U (en) * | 2009-08-31 | 2010-05-26 | 上海睿英电气有限公司 | Voltage protection circuit of frequency converter |
| CN202159973U (en) * | 2011-07-07 | 2012-03-07 | 天津市松正电动汽车技术股份有限公司 | Voltage detection protection circuit |
| CN102761096A (en) * | 2011-04-28 | 2012-10-31 | 西门子公司 | Undervoltage-overvoltage protection device and method |
| CN202712814U (en) * | 2012-05-16 | 2013-01-30 | 洛阳隆盛科技有限责任公司 | Shutdown output over-voltage and under-voltage protection circuit |
| CN103022965A (en) * | 2012-12-20 | 2013-04-03 | 安徽巨一自动化装备有限公司 | Monitoring circuit of 12V voltage in electric vehicle electric drive controller |
| CN104218532A (en) * | 2014-09-19 | 2014-12-17 | 中冶南方（武汉）自动化有限公司 | Voltage protection circuit for frequency converter direct current (DC) bus |
-
2015
- 2015-10-12 CN CN201510660573.1A patent/CN105305796A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201490701U (en) * | 2009-08-31 | 2010-05-26 | 上海睿英电气有限公司 | Voltage protection circuit of frequency converter |
| CN102761096A (en) * | 2011-04-28 | 2012-10-31 | 西门子公司 | Undervoltage-overvoltage protection device and method |
| CN202159973U (en) * | 2011-07-07 | 2012-03-07 | 天津市松正电动汽车技术股份有限公司 | Voltage detection protection circuit |
| CN202712814U (en) * | 2012-05-16 | 2013-01-30 | 洛阳隆盛科技有限责任公司 | Shutdown output over-voltage and under-voltage protection circuit |
| CN103022965A (en) * | 2012-12-20 | 2013-04-03 | 安徽巨一自动化装备有限公司 | Monitoring circuit of 12V voltage in electric vehicle electric drive controller |
| CN104218532A (en) * | 2014-09-19 | 2014-12-17 | 中冶南方（武汉）自动化有限公司 | Voltage protection circuit for frequency converter direct current (DC) bus |
Non-Patent Citations (1)
| Title |
|---|
| TEXAS INSTRUMENTS: "《TPS3701用于过压和欠压检测且具有内部基准电压的36V窗口电压比较器》", 10 December 2014 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107069668A (en) * | 2017-05-03 | 2017-08-18 | 北京索德电气工业有限公司 | A kind of frequency converter failure protection device and frequency converter |
| CN107069668B (en) * | 2017-05-03 | 2020-03-27 | 北京索德电气工业有限公司 | Frequency converter fault protection device and frequency converter |
| CN109792145A (en) * | 2017-07-31 | 2019-05-21 | 株式会社Lg化学 | The diagnostic system of vehicle electrical systems with DC-DC electric pressure converter and voltage regulator |
| CN109103850A (en) * | 2018-10-24 | 2018-12-28 | 西安特锐德智能充电科技有限公司 | Storage medium, the short-circuit protection control method of bidirectional power converter, apparatus and system |
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