CN102468686A - Instantaneous voltage drop protection device - Google Patents
Instantaneous voltage drop protection device Download PDFInfo
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- CN102468686A CN102468686A CN2011101862365A CN201110186236A CN102468686A CN 102468686 A CN102468686 A CN 102468686A CN 2011101862365 A CN2011101862365 A CN 2011101862365A CN 201110186236 A CN201110186236 A CN 201110186236A CN 102468686 A CN102468686 A CN 102468686A
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Abstract
The invention aims to provide an instantaneous voltage drop protection device which allows the repeated frequencies of charing and discharging of electrolytic capacitors to be reduced and enables longevity and small capacity of the electrolytic capacitors to be realized if the device is used in countries\regions where the voltage variation of commercial AC power is high. If an input AC voltage is in the range of 70% to 90% of a rate input voltage, an inverter is helped to carry out DC-AC conversion under a condition that the switch of a switching part is conducted, such that compensated power based on input AC power is generated and is added to input AC power via an injection transformer. Therefore, load can run with no time limit under an AC voltage of 90% of the rated input voltage without utilization of accumulated power of an electrolytic capacitor. If the input AC voltage drops to be 70% lower than the rated input voltage, the switch of the switching part is cut off, such that DC-AC conversion is carried out by a main inverter for converting the DC power accummulated in the electrolytic capacitor to obtain AC power for running of the load.
Description
Technical field
The present invention relates to from commercial AC power under the temporarily-depressed situation of the voltage of the alternating electromotive force that load provides, perhaps temporarily taking place under the situation about having a power failure, as substituting the low protective device of instantaneous voltage drop that alternating electromotive force is provided to load.
Background technology
All the time; From commercial AC power under the situation about reducing between the short time voltage of the alternating electromotive force that load provides or under the short time situation about opening circuit, being used to replace it provides low protective device of instantaneous voltage drop of alternating electromotive force extensively to be utilized (for example with reference to patent documentation 1～3 etc.) to load.
Fig. 4 is the summary pie graph of the low protective device of existing instantaneous voltage drop.The input 11 of this device is connected with commercial ac power source 1, and output 12 is connected with load 2.This device comprises: switching part 13, its 3 kinds of switches that are connected in parallel, i.e. electromagnetic relay 14, bidirectional triode thyristor (thyristor) 15, and FET switch 16; Electrolytic capacitor 17, it accumulates the direct current power of the low protection of voltage drop usefulness; Inverter 18, it can carry out AC-DC, the two-way power conversions of DC-AC; Filter 19, its analog sine that square wave of the high frequency that produced by this inverter 18 is constituted exchanges output and carries out filtering; Replenish Electricity Department 20, it is mainly used in the voltage reduction that compensation causes owing to discharging naturally of electrolytic capacitor 17; Input voltage test section 21, it detects input ac voltage (for example 100V); Replenish power driving part 22, it drives replenishing Electricity Department 20; Inverter driving portion 23, it drives inverter 18; Switch drive division 24, its on/off to each switch in the switching part 13 is switched; And control part 25, it is based on the magnitude of voltage that is obtained by input voltage test section 21, and algorithm is according to the rules controlled respectively and is replenished power driving part 22, inverter driving portion 23, switches drive division 24.Though not shown, inverter 18 possesses the circuit that thyristors such as power fet is connected into the bridge shape.In addition, replenishing Electricity Department 20 comprises: the transformer that input AC electric power is provided to 1 lateral coil and the rectification circuit that is connected with 2 lateral coils of this transformer etc.
The groundwork of the low protective device of this instantaneous voltage drop is following.
In addition, about the use respectively of each switch in the switching part 13,, omit explanation (details is with reference to patent documentation 2) owing to be not the application's main contents.In addition, the inverter 18 when electrolytic capacitor 17 is charged and the use respectively of additional Electricity Department 20, because main contents that neither the application, so omit explanation (details is with reference to patent documentation 1).
If reducing, perhaps take place the short time, the alternating voltage from commercial ac power source 1 has a power failure; Thereby the magnitude of voltage by input voltage test section 21 obtains breaks away from normal scope; Then control part 25 is judged as magnitude of voltage and reduces unusually; And all switches of switching part 13 are broken off via switching drive division 24; Thereby output 12 is cut off from input 11, and make inverter 18 carry out DC-ACs conversion (in Fig. 4, will convert alternating electromotive force into and to right-hand output) work from the direct current power of left input via inverter driving portion 23.Thus, convert the direct current power that is accumulated in the electrolytic capacitor 17 into alternating electromotive force, replace input AC electric power, to load 2 alternative alternating electromotive force is provided from output 12 from commercial ac power source 1.At this moment, from the magnitude of voltage of the alternating voltage of output 12 output, adjust through the pulse duration of the pwm control signal that provides to inverter driving portion 23 from control part 25 for each switch element in the drives inverter 18.
If general equipment or device are envisioned for load 2, then in most cases, allowing under the change of specified input voltage is limited to about-10%.Therefore; In the low protective device of existing instantaneous voltage drop, typical situation is to have stipulated the device specification according to following mode, promptly; Reducing by 10% when above from the input ac voltage of commercial ac power source 1 than specified input voltage (for example 100V); Beginning voltage protection work (that is, substituting providing of alternating electromotive force), and this voltage protection during can continuing about 1 second.When the instantaneous reduction of voltage that usually takes place, voltage 1 second with interior recovery, and after 1 instantaneous reduction of voltage has taken place, accumulating before direct current power fully recovers of electrolytic capacitor 17, the situation that the instantaneous reduction of voltage takes place once more is comparatively rare.Therefore, in use in Japan, in most cases, problem can not take place according to above-mentioned such device specification at least.
But, in the low protective device of existing instantaneous voltage drop, following problem is arranged.
That is, as stated, though in Japan, the stability of the voltage of commercial ac power source is quite high, in some countries, from the change (fluctuation) of the alternating voltage of commercial ac power source in daily frequent generation.In addition, even in same country, because the difference of area/region, the situation from the less stable of the alternating voltage of commercial ac power source usually can take place.In such country and region; Under the situation of having used the low protective device of above-mentioned instantaneous voltage drop; Input ac voltage takes place with higher frequency than low-10% the situation of specified input voltage, has utilized the voltage protection (substituting the output of alternating electromotive force) that is accumulated in the direct current power in the electrolytic capacitor whenever just carrying out at this moment.Thus, with higher frequency the full charging-sudden discharge of electrolytic capacitor takes place repeatedly, the life-span of electrolytic capacitor itself can shorten.Such state of affairs also can be owing to increasing operating cost by the frequent change electrolytic capacitor except the reduction of the reliability that causes device.
In addition; Obviously; Be not discharged the direct current power that is accumulated in the electrolytic capacitor because instantaneous voltage reduces owing to daily variation in voltage after; If before charging is accomplished, follow the voltage reduction of variation in voltage or actual instantaneous voltage to reduce once more, then can not in time (for example 1 second), carry out voltage protection, thereby the running of load might stop by the device specification specifies.For fear of such state of affairs, must increase the capacity of the electrolytic capacitor that carries in advance and prolong the time that to carry out voltage protection.But the use of so jumbo electrolytic capacitor can cause the significantly cost of device to rise.
Patent documentation 1:JP spy opens the 2008-54468 communique
Patent documentation 2:JP spy opens the 2008-54483 communique
Patent documentation 3:JP spy opens the 2009-112128 communique
Summary of the invention
The present invention does in order to solve above-mentioned problem; Its purpose is to provide a kind of instantaneous voltage drop to hang down protective device; Even in the bigger place (country, region etc.) of change from the alternating voltage of commercial ac power source; Also the frequency that discharges and recharges of Reserve Power Divisions such as electrolytic capacitor can be reduced, the cost of operating cost and device itself can be in the reliability that improves device, suppressed thus.
The present invention who does in order to solve above-mentioned problem is the low protective device of a kind of instantaneous voltage drop; It has and is used for when commercial AC power provides alternating electromotive force, accumulating the electricity accumulating unit based on the direct current power of this alternating electromotive force; When the alternating voltage that offers load from above-mentioned commercial ac power source temporarily reduces, replace it and utilize the direct current power that is accumulated in the above-mentioned electricity accumulating unit alternating electromotive force to be provided to load;
The low protective device of this instantaneous voltage drop is characterised in that, comprising:
(a) charhing unit, it utilizes the alternating electromotive force that provides from commercial AC power that above-mentioned electricity accumulating unit is charged;
(b) substitute electric power the unit is provided, the direct current power that its utilization is accumulated in the above-mentioned electricity accumulating unit generates the alternative alternating electromotive force that is used to replace input AC electric power;
(c) voltage compensation unit, it carries out the DC-AC conversion after input AC electric power is carried out rectification, produce and the synchronous alternating voltage of this input ac voltage, and it is added to this input ac voltage;
(d) input voltage identifying unit, it detects input ac voltage, and judge this input ac voltage whether be lower than than specified input voltage low first judge voltage and whether be lower than than this first judge voltage low second judge voltage; And
(e) control unit; It provides unit and above-mentioned voltage compensation unit to control to above-mentioned alternative electric power; So that be first when judging that voltage is above be judged to be input ac voltage through above-mentioned input voltage identifying unit; To load output input ac voltage,, make above-mentioned voltage compensation cell operation being judged to be that above-mentioned input ac voltage judges than first that voltage is low and being second judgement voltage when above; Through this voltage compensation unit input ac voltage has been compensated the alternating electromotive force behind the voltage to load output; Being judged to be above-mentioned input ac voltage when judging that than second voltage is low, make above-mentioned alternative electric power that cell operation is provided, substitute alternating electromotive force to load output.
In addition, here, so-called specified input voltage is for making the standard value of the input ac voltage that this device operate as normal stipulates, normally allowing the central value of mobility scale.Generally, be 100V or 200V in Japan, outside Japan 110V, 220V, 240V etc.
Specifically; Above-mentioned charhing unit and above-mentioned alternative electric power provide the unit to constitute and have used two-way inverter; This two-way inverter is a direct current power with above-mentioned input AC power conversions; And above-mentioned electricity accumulating unit charged, and will convert alternating electromotive force into from the direct current power that this electricity accumulating unit discharges.
In this constituted, above-mentioned voltage compensation unit can constitute and comprise: rectification unit, and it carries out rectification to above-mentioned input ac voltage; Subordinate inverter, it is different from above-mentioned two-way inverter, converts the direct current power that above-mentioned rectification unit produced into alternating electromotive force; And injection transformer, it will add to input ac voltage by the alternating voltage that this subordinate inverter obtains.
In addition, as other forms, above-mentioned voltage compensation unit can constitute and comprise: rectification unit, and its shared above-mentioned two-way inverter carries out rectification to above-mentioned input ac voltage; Injection transformer, it will add to input ac voltage by the alternating voltage that above-mentioned two-way inverter obtains; And switch unit; It switches the input that is used for the DC-AC conversion in the above-mentioned two-way inverter between the output of above-mentioned rectification unit and above-mentioned electricity accumulating unit, and switches the output of the DC-AC conversion in this two-way inverter at above-mentioned injection transformer with between to the outlet side of load.
In addition, for example first judges that voltage can be set at respect to low about-10% the voltage of specified input voltage, and second judges that voltage can be set at respect to low about-15～-30% the voltage of specified input voltage.That is, be under the situation of 100V at specified input voltage, first judges that voltage can be about 90V, second judges that voltage can be about 70～85V.
In the low protective device of instantaneous voltage drop of the present invention; Even being lower than first at the input ac voltage that provides from commercial AC power judges under the voltage condition; As long as be more than the second judgement voltage; Then do not make alternative electric power that cell operation is provided, do not use the direct current power that is accumulated in the electricity accumulating unit.At this moment, only utilize input AC electric power to come the voltage compensation cell operation that undertension is partly compensated, thus, be lower than first and judge that the alternating voltage of voltage improves.Preferably, can constitute, according to making the alternating voltage behind the compensation alternating voltage that adds that above-mentioned voltage compensation unit produced set this compensation alternating voltage with the mode that the first judgement voltage becomes same level.In this constitutes, be in the first judgement voltage (for example 90V) and second at input ac voltage and judge under the situation in the scope of voltage (for example 70V) that output AC voltage maintains first and judges voltage (for example 90V).
At this moment, though input current increases the part of being worked in the voltage compensation unit,, then can there be the voltage compensation that special time restriction ground continues to carry out insufficient section as long as commercial ac power source has the providing capability that provides this input to increase part.Not that the instantaneous voltage that electric power provides the unusual grade of side to be caused reduces; But under the situation that variation in voltage (fluctuation of voltage) is bigger originally; Because electric power providing capability itself is almost no problem; So the influence that can not followed the voltage of such variation in voltage to reduce continues to provide the voltage of the degree that this load can turn round to load.
On the other hand; Being lower than second at input ac voltage judges under the voltage condition; The possibility that actual instantaneous voltage reduces is higher; Even and suppose it is not like this, in the voltage compensation that the voltage compensation unit that has only used input AC electric power is carried out, the possibility that voltage is fully risen is arranged also.Therefore, in this case, make alternative electric power that cell operation is provided, replace input AC electric power, the alternative alternating electromotive force that has used the direct current power that is accumulated in the electricity accumulating unit is provided to load.This provides identical with the alternative alternating electromotive force of the low protective device of existing instantaneous voltage drop.
According to the low protective device of instantaneous voltage drop of the present invention; Drop at the alternating voltage that provides from commercial AC power under for example about 70～90% the situation of specified input voltage; Do not utilized the low protection of the instantaneous voltage drop of accumulating electric power of electricity accumulating unit, and utilized abnormal voltage change compensate function just can the electric power that can turn round be provided to load.Thus, even under the situation about in the bigger place of the variation in voltage of commercial ac power source, using, also can reduce the discharge and subsequent the full occurrence frequency that charges that are used to provide the electricity accumulating unit that substitutes alternating electromotive force.Thus, for example can prolong electrolytic capacitor etc.,, can improve the reliability of device owing to the life-span that causes the electricity accumulating unit that performance degradation is so repeatedly that discharges and recharges.In addition, can reduce the frequency of replacing of this unit of the deterioration of following electricity accumulating unit, reduce operating cost.
In addition; According to the low protective device of instantaneous voltage drop of the present invention, because as above-mentioned, be used to provide the frequency reduction of the discharge of the electricity accumulating unit that substitutes alternating electromotive force; So can reduce under situation that instantaneous voltage reduces has taken place reality charge insufficient such situation of electricity accumulating unit.Therefore, needn't increase the capacity of electricity accumulating unit, necessary voltage protection fully can be provided in the electricity accumulating unit that uses than low capacity in order to keep too much direct current power often.Thus, can reduce installation cost.
Description of drawings
Fig. 1 is the summary module structure drafting as the low protective device of instantaneous voltage drop of one embodiment of the invention.
Fig. 2 is that the instantaneous voltage drop of present embodiment hangs down the key diagram of the voltage protection work of protective device.
Fig. 3 is the summary module structure drafting as the low protective device of instantaneous voltage drop of other embodiment of the present invention.
Fig. 4 is the summary module structure drafting of an embodiment of the low protective device of existing instantaneous voltage drop.
Symbol description:
1 commercial ac power source
11 inputs
12 outputs
13 switching parts
14 electromagnetic relays
15 bidirectional triode thyristors
The 16FET switch
17 electrolytic capacitors
18 inverters (main inverter)
19 filters
2 loads
20 replenish Electricity Department
21 input voltage test sections
22 replenish power driving part
23 inverter driving portions (main inverter drive division)
24 switch drive division
25 control parts
30 subordinate inverter
31 rectification partes glabras
32 injection transformers
33 subordinate inverter drive divisions
34 first switches
35 second switches
37 second switch drive division
40 control parts
41 input voltage detection units
42 inverter control parts
43 switch control portion
Embodiment
An embodiment (below, be called " first embodiment ") of the low protective device of instantaneous voltage drop of the present invention is described.Fig. 1 is the summary module structure drafting of the low protective device of instantaneous voltage drop of first embodiment.For the inscape additional phase identical with the existing apparatus of the Fig. 4 that has explained with symbol, clear and definite corresponding relation.Wherein because explanation is numerous and diverse, so the formation of present embodiment and after in the formation of other embodiment of stating, omitted the additional Electricity Department of in Fig. 4, putting down in writing 20 and replenished power driving part 22.Therefore, in the low protective device of instantaneous voltage drop of the present invention,, except that inverter 18, also can add to be provided with and replenish Electricity Department 20 for electrolytic capacitor 17 is charged.
As shown in Figure 1; In the low protective device of instantaneous voltage drop of present embodiment; Between input 11 and switching part 13, insert 2 lateral coils of injection transformer 32; 1 lateral coil of this injection transformer 32 be different from main inverter (here, for after " subordinate inverter " stated distinguish mutually, be called " main inverter ") the output connection of 18 subordinate inverter 30.The input of subordinate inverter 30 is connected with the rectification partes glabra 31 that the input ac voltage from commercial ac power source 1 is carried out the direct current smoothing.Rectification partes glabra 31 comprises the for example diode of bridge joint formation, and subordinate inverter 30 and main inverter 18 likewise comprise the thyristor that bridge joint constitutes etc.If drive subordinate inverter 30 through subordinate inverter drive division 33; Then subordinate inverter 30 will convert into by the direct voltage of rectification partes glabra 31 output with input ac voltage synchronous, be the alternating voltage that frequency is identical and phase place is consistent, and it is added to input ac voltage via injection transformer 32.Therefore, in this case, through the stage behind 2 lateral coils of injection transformer 32, increase the part that adds through these 2 lateral coils from the amplitude of the input ac voltage of input 11.That is, utilize rectification partes glabra 31, subordinate inverter 30, injection transformer 32 in order to realize so-called AVR (Automatic Voltage Regulator) function, reach subordinate inverter drive division 33, these are equivalent to voltage compensation of the present invention unit.
Acceptance is by input voltage test section 21 detected magnitude of voltage information and control main inverter drive division 23 respectively, switch drive division 24, and the control part 40 of subordinate inverter drive division 33 comprise that input voltage detection unit 41, inverter control part 42, switch control portion 43 are as functional module.This control part 40 is reached the function of above-mentioned each functional module to comprise that for example the microcomputer of CPU, ROM, RAM etc. is that the center constitutes through carrying out the control program that is kept in advance among the ROM.In this embodiment, input voltage test section 21 and input voltage detection unit 41 are equivalent to input voltage identifying unit of the present invention, and inverter control part 42 and switch control portion 43 are equivalent to control unit.
Fig. 2 is that the instantaneous voltage drop of present embodiment hangs down the key diagram of the voltage protection work of protective device; (a) be to schematically show the figure that inputs to the input ac voltage of input 11 from commercial AC power 1; (b) being to be shown schematically in the low protective device of instantaneous voltage drop of present embodiment to the input ac voltage shown in (a) respectively from the figure of the alternating voltage of output 12 outputs, (c) is to be shown schematically in the low protective device of existing instantaneous voltage drop for example shown in Figure 4 to the input ac voltage shown in (a) respectively from the figure of the alternating voltage of output 12 outputs.
The distinctive voltage protection work of the low protective device of instantaneous voltage drop of present embodiment shown in Figure 1 is described with reference to Fig. 2.
In control part 40; Input voltage detection unit 41 is kept watch on the magnitude of voltage information of the input ac voltage that provides from input voltage test section 21 all the time, judge this magnitude of voltage with respect to specified input voltage (for example 100V, 200V, 220V, 240V etc. according to specification and difference) be in more than 90%, in which scope of less than 90% and 70% above, less than 70%.That is, in this example, 90% value of specified input voltage is equivalent to of the present invention first and judges voltage, and 70% value of specified input voltage is equivalent to of the present invention second and judges voltage.If input ac voltage is (if being reduced in 10% from the voltage of specified input voltage) more than 90% with respect to specified input voltage; The providing of alternating electromotive force that then is judged as from commercial ac power source 1 is normal, and switch control portion 43 is made as conducting state via switching drive division 24 at least one switch (being generally electromagnetic relay 14) with switching part 13.In addition, subordinate inverter 30 is made as halted state.Thus, make offer input 11 from commercial AC power 1 alternating electromotive force directly through output 12 and offer load 2 (with reference to Fig. 2 (b) it < A>or < B >).
Though change corresponding to input ac voltage; The alternating voltage maximum that offers load 2 might descend 10% from specified input voltage; But; Generally the permissible range as the input voltage change of the various device of load 2 is about ± 10% with respect to specified input voltage, and in fact further considers the enough and to spare amount, the variation in voltage of in most cases allowing tens %.Thus, though as above-mentioned from alternating voltage of this device output descend about 10% can overslaugh load 2 yet running.Certainly, under the situation of the load of the permissible range littler (for example ± 5%) of known use input voltage change, the determinating reference of change input voltage detection unit 41 gets final product.
At input ac voltage is under the situation of normal range (NR); In control part 40, inverter control part 42 is kept watch on the charging voltage of electrolytic capacitor 17 through not shown charging voltage test section, under this charging voltage situation lower than assigned voltage; For electrolytic capacitor 17 is charged rapidly; And make main inverter 18 work via main inverter drive division 23, and be direct current power with the input AC power conversions, come electrolytic capacitor 17 is charged.In addition; Under the situation that is reduced to the less reduction of degree that the nature discharge causes of the charging voltage of electrolytic capacitor 17; Can not carry out charging rapidly, and compare charging slowly by not shown additional Electricity Department based on the AC-DC conversion work of main inverter 18.Through such charging, under the situation that input AC electric power normally is provided, electrolytic capacitor 17 is kept the state that roughly is full of electricity.
If input ac voltage drops to respect to specified input voltage less than 90%; And be judged to be through input voltage detection unit 41 and be in less than 90% and be in the scope more than 70%, then inverter control part 42 makes subordinate inverter 30 work via subordinate inverter drive division 33.In addition, switching part 13 is kept conducting state.At this moment; Inverter control part 42 is accepted the magnitude of voltage information of input ac voltage from input voltage test section 21; Potential difference between calculating and the predefined target alternating voltage; And export control signal to subordinate inverter drive division 33, so that generate the bucking voltage suitable with this potential difference.In this example, target alternating voltage and of the present invention first judges that voltage is identical, is set to 90% value of specified input voltage.Thus, in subordinate inverter 30, generate the corresponding alternating electromotive force of potential difference between 90% the voltage with the input ac voltage of reality and specified input voltage, this alternating electromotive force is added to input AC electric power via injection transformer 32.Therefore; Input ac voltage be in not enough specified input voltage 90% and be under the situation in the scope more than 70%; Apart from this insufficient section of 90% by way of compensation voltage be coupled with through injection transformer 32, maintain 90% (with reference to Fig. 2 (b) it < C >) of specified input voltage to the alternating voltage of load 2 output from output 12.
In addition; Though when carrying out the DC-AC conversion by subordinate inverter 30; From commercial AC power 1 so much input current is provided; But then no problem fully as long as commercial ac power source 1 has this providing capability, not free basically the restriction can compensate the voltage of the insufficient section of above-mentioned that kind.At this moment, do not use the direct current power that is accumulated in the electrolytic capacitor 17, just can the enough alternating electromotive forces that make these load 2 runnings be provided load 2.
If input ac voltage drops to less than 70% with respect to specified input voltage, then in control part 40, switch control portion 43 all breaks off the switch of switching part 13 via switching drive division 24, promptly cuts off output 12 from commercial AC power 1 from input 11.Roughly simultaneously; Inverter control part 42 becomes the alternative alternating electromotive force of above-mentioned target alternating voltage in order to use the direct current power that remains in the electrolytic capacitor 17 to generate, and makes main inverter 18 carry out the DC-AC conversion work via main inverter drive division 23.Thus, replace input AC electric power, from by electrolytic capacitor 17, main inverter 18, filter 19, and the of the present invention alternative electric power that constitutes of main inverter drive division 23 provide the unit to load 2 alternative alternating electromotive force to be provided via output 12.Therefore, the alternating voltage to load 2 outputs maintains for example 90% (with reference to Fig. 2 (b) it < D >) of specified input voltage.But, at this moment, be accumulated in the direct current power in the electrolytic capacitor 17, so continue to provide the alternating electromotive force of the time that is equivalent to this direct current strength to load 2 owing to consume.
If as above-mentioned; Input ac voltage is more than 70% or more than 90% from the recovering state that drops to less than 70% with respect to specified input voltage to this voltage; Then the switch of switching part 13 is switched on; As above-mentioned, the alternating electromotive force that after adding compensates electric on the input AC electric power, obtains or only input AC electric power be provided for load 2.
【0034】
Shown in Fig. 2 (c); In the low protective device of existing instantaneous voltage drop; If input ac voltage drops to less than 90% with respect to specified input voltage, then implement to have used providing of the alternative alternating electromotive force that remains on the direct current power in the electrolytic capacitor 17 immediately.Thus, under the situation of big (more than ± 10%), can frequently carry out the charged of electrolytic capacitor 17 in the change (fluctuation) of for example input ac voltage.In addition, if because the change of input ac voltage and reduce or just become the instantaneous reduction of zero back (before being about to charging) generation voltage at the electric power of accumulating of electrolytic capacitor 17 then can not be carried out voltage protection, the running of load 2 will soon stop.
With respect to this, in the low protective device of instantaneous voltage drop of present embodiment,, also use the electric power of accumulating of electrolytic capacitor 17 hardly even the change of input ac voltage is arranged.Thus, do not carry out the frequent charged of electrolytic capacitor 17, therefore, can prolong the life-span of electrolytic capacitor 17.In addition, when instantaneous voltage reduced, the danger that can not carry out voltage protection was also lower, and, because the capacity of electrolytic capacitor 17 is less also passable, so installation cost also can reduce.
Below, other embodiment of the present invention (below, be called " second embodiment ") are described.Fig. 3 is the summary module structure drafting of the low protective device of instantaneous voltage drop of this second embodiment.For the inscape additional phase identical with the Fig. 1 that has explained, device shown in Figure 4 with symbol, clear and definite corresponding relation.
In above-mentioned first embodiment; Be provided with subordinate inverter with being different from main inverter; But in the low protective device of instantaneous voltage drop of this second embodiment; Dual-purpose subordinate inverter and main inverter through to the switching of the input-output line of this inverter and the switching of control, carry out the voltage protection identical with first embodiment.
That is, between 1 lateral coil of the inverter 18 of the function of subordinate inverter that has first embodiment concurrently 30 and main inverter 18 and injection transformer 32, insert first switch 34, between this inverter 18 and filter 19, insert second switch 35.This first, second switch 34,35 switches drive division 37 through second and is controlled to be the opposing party's disconnection when a side connects.As these switches 34,35, can use thyristors such as IGBT.
Be in respect to specified input voltage at input ac voltage under the situation of the scope more than 90% (Fig. 2 < A>or < B >), control part 40 switches drive division 37 via second breaks off first switch 34, and second switch 35 is connected.And; Inverter control part 42 as required (specifically; When the charging voltage of electrolytic capacitor 17 reduces significantly); Control the work of this inverter 18,, and electrolytic capacitor 17 is charged so that the main alternating electromotive force that the second switch 35 through on-state is provided to inverter 18 carries out the AC-DC conversion.In addition, be in less than 90% with respect to specified input voltage and be (Fig. 2 < C >) under the situation in the scope more than 70% at input ac voltage, control part 40 switches drive division 37 via second breaks off second switch 35, and first switch 34 is connected.And the work of inverter control part 42 these inverters 18 of control is so that carry out the DC-AC conversion to the direct current power that derives from input AC electric power that offers inverter 18 from rectification partes glabra 31.Be provided for 1 lateral coil of injection transformer 32 from the compensates electric of inverter 18 output via first switch 34 of on-state, and be added on the input AC electric power through injection transformer 32.
Be (Fig. 2 it < D >) under the situation of less than 70% with respect to specified input voltage at input ac voltage, control part 40 switches drive division 37 via second breaks off first switch 34, and second switch 35 is connected.And the work of inverter control part 42 control inverters 18 is so that carry out the DC-AC conversion to the direct current power that is accumulated in the electrolytic capacitor 17.Through this work, the alternative alternating electromotive force of exporting from inverter 18 offers load 2 via second switch 35 from output 12.
Through above control; In the low protective device of the instantaneous voltage drop of this second embodiment also with first embodiment likewise; Can not use accumulating electric power or using this to accumulate electric power of electrolytic capacitor 17 according to the reduction degree of AC-input voltage, coming provides alternating electromotive force to load 2.Specifically, even input ac voltage is lower than 90% with respect to specified input voltage, as long as but be more than 70%, then do not use the electric power of accumulating of electrolytic capacitor 17, just can no time limit ground 90% alternating voltage of specified input voltage is provided to load 2.
In addition, the foregoing description is an example of the present invention, obviously in the scope of the purport that the application invents, suitably is out of shape, revises, appends in the scope that is also contained in the application's claim.For example, 90%, 70% such numerical value of enumerating out in the above-described embodiments is that the first judgement voltage and second judges that the value of voltage only is an example, certainly suitably changes according to the device specification of having considered environment for use and purpose etc.
Claims (5)
1. an instantaneous voltage drop hangs down protective device; It has and is used for when commercial AC power provides alternating electromotive force, accumulating the electricity accumulating unit based on the direct current power of this alternating electromotive force; When the alternating voltage that offers load from above-mentioned commercial ac power source temporarily reduces; Replace it and utilize the direct current power that is accumulated in the above-mentioned electricity accumulating unit alternating electromotive force to be provided to load
The low protective device of this instantaneous voltage drop is characterised in that, comprising:
(a) charhing unit, it utilizes the alternating electromotive force that provides from commercial AC power that above-mentioned electricity accumulating unit is charged;
(b) substitute electric power the unit is provided, the direct current power that its utilization is accumulated in the above-mentioned electricity accumulating unit generates the alternative alternating electromotive force that is used to replace input AC electric power;
(c) voltage compensation unit, it carries out the DC-AC conversion after input AC electric power is carried out rectification, produce and the synchronous alternating voltage of this input ac voltage, and it is added to this input ac voltage;
(d) input voltage identifying unit, it detects input ac voltage, and judge this input ac voltage whether be lower than than specified input voltage low first judge voltage and whether be lower than than this first judge voltage low second judge voltage; And
(e) control unit; It provides unit and above-mentioned voltage compensation unit to control to above-mentioned alternative electric power; So that be first when judging that voltage is above be judged to be input ac voltage through above-mentioned input voltage identifying unit; To load output input ac voltage,, make above-mentioned voltage compensation cell operation being judged to be that above-mentioned input ac voltage judges than first that voltage is low and being second judgement voltage when above; Through this voltage compensation unit input ac voltage has been compensated the alternating electromotive force behind the voltage to load output; Being judged to be above-mentioned input ac voltage when judging that than second voltage is low, make above-mentioned alternative electric power that cell operation is provided, substitute alternating electromotive force to load output.
2. instantaneous voltage drop according to claim 1 hangs down protective device, it is characterized in that,
Above-mentioned charhing unit and above-mentioned alternative electric power provide the unit to use two-way inverter; This two-way inverter is a direct current power with above-mentioned input AC power conversions; And above-mentioned electricity accumulating unit charged, and will convert alternating electromotive force into from the direct current power that this electricity accumulating unit discharges.
3. instantaneous voltage drop according to claim 2 hangs down protective device, it is characterized in that, above-mentioned voltage compensation unit comprises:
Rectification unit, it carries out rectification to above-mentioned input ac voltage;
Subordinate inverter, it is different from above-mentioned two-way inverter, converts the direct current power that above-mentioned rectification unit produced into alternating electromotive force; And
Injection transformer, it will add to input ac voltage by the alternating voltage that this subordinate inverter obtains.
4. instantaneous voltage drop according to claim 2 hangs down protective device, it is characterized in that, above-mentioned voltage compensation unit comprises:
Rectification unit, its shared above-mentioned two-way inverter carries out rectification to above-mentioned input ac voltage;
Injection transformer, it will add to input ac voltage by the alternating voltage that above-mentioned two-way inverter obtains; And
Switch unit; It switches the input that is used for the DC-AC conversion in the above-mentioned two-way inverter between the output of above-mentioned rectification unit and above-mentioned electricity accumulating unit, and switches the output of the DC-AC conversion in this two-way inverter at above-mentioned injection transformer with between to the outlet side of load.
5. according to the low protective device of each described instantaneous voltage drop in the claim 1～4, it is characterized in that,
Set this compensation alternating voltage according to making the alternating voltage behind the compensation alternating voltage that adds that above-mentioned voltage compensation unit produced with the mode that the first judgement voltage becomes same level.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010254516A JP5333867B2 (en) | 2010-11-15 | 2010-11-15 | Instantaneous voltage drop protection device |
| JP2010-254516 | 2010-11-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102468686A true CN102468686A (en) | 2012-05-23 |
| CN102468686B CN102468686B (en) | 2014-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110186236.5A Expired - Fee Related CN102468686B (en) | 2010-11-15 | 2011-07-05 | Instantaneous voltage drop protection device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP5333867B2 (en) |
| CN (1) | CN102468686B (en) |
| TW (1) | TWI493833B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108199596A (en) * | 2017-12-29 | 2018-06-22 | 中国人民解放军海军工程大学 | Three-phase multi-ladder wave inverter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001197685A (en) * | 2000-01-07 | 2001-07-19 | Fuji Electric Co Ltd | Uninterruptible power supply system |
| JP2006217688A (en) * | 2005-02-01 | 2006-08-17 | Chugoku Electric Power Co Inc:The | Instantaneous voltage drop compensation device |
| CN101383514A (en) * | 2007-07-06 | 2009-03-11 | 三菱电机株式会社 | Ups device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100414811C (en) * | 2003-10-27 | 2008-08-27 | 三菱电机株式会社 | Power supply apparatus |
-
2010
- 2010-11-15 JP JP2010254516A patent/JP5333867B2/en not_active Expired - Fee Related
-
2011
- 2011-07-05 CN CN201110186236.5A patent/CN102468686B/en not_active Expired - Fee Related
- 2011-08-12 TW TW100128838A patent/TWI493833B/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001197685A (en) * | 2000-01-07 | 2001-07-19 | Fuji Electric Co Ltd | Uninterruptible power supply system |
| JP2006217688A (en) * | 2005-02-01 | 2006-08-17 | Chugoku Electric Power Co Inc:The | Instantaneous voltage drop compensation device |
| CN101383514A (en) * | 2007-07-06 | 2009-03-11 | 三菱电机株式会社 | Ups device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108199596A (en) * | 2017-12-29 | 2018-06-22 | 中国人民解放军海军工程大学 | Three-phase multi-ladder wave inverter |
| CN108199596B (en) * | 2017-12-29 | 2020-09-08 | 中国人民解放军海军工程大学 | Three-phase multi-step wave inverter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012105516A (en) | 2012-05-31 |
| JP5333867B2 (en) | 2013-11-06 |
| TW201223079A (en) | 2012-06-01 |
| CN102468686B (en) | 2014-08-20 |
| TWI493833B (en) | 2015-07-21 |
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