CN102545372A - Instantaneous voltage reduction protecting device - Google Patents
Instantaneous voltage reduction protecting device Download PDFInfo
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- CN102545372A CN102545372A CN2011101864341A CN201110186434A CN102545372A CN 102545372 A CN102545372 A CN 102545372A CN 2011101864341 A CN2011101864341 A CN 2011101864341A CN 201110186434 A CN201110186434 A CN 201110186434A CN 102545372 A CN102545372 A CN 102545372A
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Abstract
The invention aims to be used in countries/regions where voltage change of commercial AC power is large and to reduce the repetition frequency of charging and discharging of an electrolytic capacitor so as to make the electrolytic capacitor to have a long service lifetime and a small capacitance. When 90-80% of fixed AC voltage is input, only a second semiconductor switch is communicated, and load is applied to the AC voltage which is increased by 10% by an auto-transformer. When the input AC voltage is 110% of fixed voltage, only a third semiconductor switch is communicated, and load is applied to the AC voltage which is decreased by 10% by the auto-transformer. If the input AC voltage is decreased to a value, less than 80% of the fixed voltage, all the switches will be disconnected, and the inverter can conduct DC/AC inversion, and alternative AC power can be supplied to the load within a short time.
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 semiconductor 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 AC/DC; 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.
Control part 25 is constantly kept watch on the magnitude of voltage that is obtained by input voltage test section 21; Under the situation in this magnitude of voltage is in normal scope; Make at least one switch connection in the switching part 13, will export from output 12 from the alternating electromotive force former state that commercial AC power 1 provides, and offer load 2.In addition; Control part 25 makes inverter 18 carry out ac/dc conversion (in Fig. 4, will convert direct current power from the alternating electromotive force of right-hand input into and to left output) work via inverter driving portion 23; Perhaps make and replenish Electricity Department 20 work, be full of thereby electrolytic capacitor 17 charged to roughly via additional power driving part 22.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 AC/DCs 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, input ac voltage takes place with higher frequency from the situation that specified input voltage changes more than ± 10%.
In such country and region; Under the situation of having used the low protective device of above-mentioned instantaneous voltage drop; If input ac voltage reduces more than 10% from specified input voltage, just then whenever execution this moment has utilized the voltage protection (substituting the output of alternating electromotive force) that is accumulated in the direct current power in the electrolytic capacitor.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.
On the other hand, in the low protective device of existing general instantaneous voltage drop, risen 10% when above from specified input voltage at input ac voltage, make this voltage directly through and be applied in the load.Thus, for example have input ac voltage has raise the situation of 10% function that just shuts down automatically when above from specified input voltage under in the load that connects, whenever input ac voltage increases 10% when above from specified input voltage, turning round just stops.
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 situation that load operation stops can be to reduce as much as possible, and, the cost of operating cost and device itself can be in the reliability that improves device, suppressed through reducing the frequency that discharges and recharges of Reserve Power Divisions such as electrolytic capacitor.
The present invention who does in order to solve above-mentioned problem is the low protective device of a kind of instantaneous voltage drop, and it possesses: electricity accumulating unit, and it is used to accumulate direct current power; And two-way inverter unit, it will convert direct current power into from the alternating electromotive force that commercial AC power provides, and come above-mentioned electricity accumulating unit is charged, and will convert alternating electromotive force into from the direct current power that this electricity accumulating unit discharges.This instantaneous voltage drop hangs down protective device, when the alternating voltage that offers load from commercial AC power temporarily reduces, replaces it and utilizes the direct current power that is accumulated in the above-mentioned electricity accumulating unit, to load alternating electromotive force is provided through above-mentioned two-way inverter unit.The low protective device of this instantaneous voltage drop is characterised in that, comprising:
(a) voltage-adjusting unit; It is used for the input ac voltage that provides from commercial AC power as input, and taking-up is with boost first alternating voltage that obtains after the regulation ratio and with second alternating voltage that obtains after this input ac voltage step-down regulation ratio of this input ac voltage;
(b) switch unit, any of the alternative alternating voltage that it is used for optionally exporting above-mentioned input ac voltage, first alternating voltage that above-mentioned voltage-adjusting unit produces, second alternating voltage that this voltage-adjusting unit produces, generate through the AC/DC conversion that above-mentioned two-way inverter unit carried out;
(c) input voltage identifying unit; It detects above-mentioned input ac voltage, and judge this input ac voltage whether be lower than than specified input voltage low first judge voltage, whether be lower than than this first judge voltage low second judge voltage and whether be lower than than specified input voltage high the 3rd judge voltage;
(d) control unit; It is controlled above-mentioned switch unit and above-mentioned two-way inverter unit; So that be first to judge more than the voltage and when judging that than the 3rd voltage is low,, be judged to be that above-mentioned input ac voltage judges than first that voltage is low and be that the second judgement voltage is when above to load output input ac voltage be judged to be input ac voltage through above-mentioned input voltage identifying unit; Export first alternating voltage to load; Being judged to be above-mentioned input ac voltage is the 3rd when judging that voltage is above, exports second alternating voltage to load, is being judged to be above-mentioned input ac voltage when judging that than second voltage hangs down; Make above-mentioned two-way inverter unit work, substitute alternating electromotive force to load output.
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.
Above-mentioned voltage-adjusting unit for example can adopt the formation of using autotransformer (auto transformer).
In addition, for example, can be set at; First judges that voltage is with respect to low about-10% the voltage of specified input voltage (promptly; About 90% voltage of specified input voltage), second judges that voltage is with respect to low about-15%～-25% the voltage of specified input voltage (that is the assigned voltage in about 75～85% scopes of specified input voltage); The 3rd judges that voltage is with respect to high about 10% the voltage of specified input voltage (that is about 110% of specified input voltage voltage).That is, be under the situation of 100V at specified input voltage, can be made as, first judges that voltage is approximately 90V, and second judges that voltage is approximately 75～85V, and the 3rd judges that voltage is approximately 110V.In addition, it is first alternating voltage that voltage-adjusting unit can be established the input ac voltage voltage that obtains after about 10～15% that boosts, and establishing the voltage that obtains after the input ac voltage step-down about 10～15% is second alternating voltage.
In the low protective device of instantaneous voltage drop of the present invention; Even judge under the situation that voltage descended than first at the input ac voltage that provides from commercial AC power; As long as be more than the second judgement voltage; Then do not make two-way inverter unit work, do not use the direct current power that is accumulated in the electricity accumulating unit.At this moment, first alternating voltage that obtains after selecting input ac voltage to be boosted by switch unit through voltage-adjusting unit, and export to load.Thus, output voltage improves the amount of boosting than input ac voltage.On the other hand, be under the 3rd situation about judging more than the voltage at the input ac voltage that provides from commercial AC power, select second alternating voltage that obtains after with the input ac voltage step-down through voltage-adjusting unit by switch unit, and export to load.Thus, output voltage is than the amount of the low step-down of input ac voltage.Thus; Even judge the input voltage change that voltage is big or become than the 3rd and judge under the situation of the input voltage change that voltage is little having taken place to become than first; Can not receive the influence of such variation in voltage yet, can continue load is provided the alternating voltage of the degree that this load can turn round.
On the other hand, judging under the situation that voltage descended than second at input ac voltage, is not simple variation in voltage, but instantaneous voltage reduces or the possibility that has a power failure is higher.Therefore, in this case, control unit makes two-way inverter unit carry out the AC/DC conversion work, produces the alternative alternating electromotive force that has used the direct current power that is accumulated in the electricity accumulating unit.Simultaneously, through switch unit with input ac voltage, first alternating voltage, and second alternating voltage line broken circuit is provided, the alternative alternating voltage that provides two-way inverter unit to produce to load.In addition, this is identical with providing of alternative alternating electromotive force in 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 75～90% 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 the capability of compensating voltage fluctuation function of autotransformer etc. just can continue to provide the electric power that can make the load normal operation to load.In addition, even rise under for example about 110～130% the situation of specified input voltage, also can utilize the capability of compensating voltage fluctuation function to continue the electric power that provides load to run well at the alternating voltage that provides from commercial AC power.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 state of affairs that causes load to shut down.
In addition, according to the low protective device of instantaneous voltage drop of the present invention,, can reduce the occurrence frequency of the discharge and subsequent the full charging of electricity accumulating unit owing to can avoid because of daily variation in voltage carries out the discharge from electricity accumulating unit.Thus, the life-span that can prolong electrolytic capacitor etc., cause the electricity accumulating unit that performance degradation is such owing to repeated charge, and can improve the reliability of device.In addition, can reduce the deterioration of following electricity accumulating unit and the frequency of the replacing of this unit that carries out, and reduce operating cost.
Further; 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 constantly to keep too much direct current power.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 the workflow diagram of the low protective device of instantaneous voltage drop of present embodiment.
The key diagram of the work when Fig. 3 is the input voltage change of the low protective device of the instantaneous voltage drop of present embodiment.
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
2 loads
11 inputs
12 outputs
13 switching parts
14 electromagnetic relays
15 bidirectional triode thyristors
16 first semiconductor switchs
17 electrolytic capacitors
18 inverters
19 filters
20 replenish Electricity Department
21 input voltage test sections
22 replenish power driving part
23 inverter driving portions
24 switch drive division
25 control parts
30 autotransformers
31 second semiconductor switchs
32 the 3rd semiconductor switchs
33 switch drive division
40 control parts
41 input voltage detection units
42 inverter control parts
43 switch control portion
Embodiment
Below, with reference to an embodiment of the low protective device of description of drawings instantaneous voltage drop of the present invention.
Fig. 1 is the summary module structure drafting of the low protective device of instantaneous voltage drop of present embodiment.For the additional same-sign of the inscape identical, detailed with the existing apparatus of the Fig. 4 that has explained.
As shown in Figure 1; In the low protective device of instantaneous voltage drop of present embodiment; The switching part 13 that is equivalent to the switching part 13 of existing apparatus shown in Figure 4 and is equivalent to switch unit of the present invention is except comprising electromagnetic relay 14, bidirectional triode thyristor 15, first semiconductor switch 16, also comprising second semiconductor switch 31 and the 3rd semiconductor switch 32 of the public connection of an end.Between input 11 and switching part 13, dispose the autotransformer 30 that is equivalent to voltage-adjusting unit of the present invention.This autotransformer 30 has: terminal A, and the input ac voltage that is applied to input 11 is applied to terminal A by former state; Terminal B, the voltage that its output is boosted and obtained after 10% input ac voltage that is applied to terminal A; And terminal C, it is exported obtaining voltage after the input ac voltage step-down 10% that is applied to terminal A.One end of the bidirectional triode thyristor 15 and first semiconductor switch 16 is connected with the terminal A of autotransformer 30, and an end of second semiconductor switch 31 is connected with the terminal B of autotransformer 30, and an end of the 3rd semiconductor switch 32 is connected with the terminal C of autotransformer 30.The electromagnetic relay 14 that comprises in the switching part 13, bidirectional triode thyristor 15, first to the 3rd semiconductor switch 16,31,32 switch on/off (conduction and cut-off) according to the control signal that provides from switching drive division 33 respectively.
Acceptance is by input voltage test section 21 detected magnitude of voltage information and control inverter drive division 23, the control part 40 that switches drive division 33 comprise that input voltage detection unit 41, inverter control part 42, switch control portion 43 etc. are as functional module respectively.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 of the present invention.
Fig. 2 is the workflow diagram of the low protective device of instantaneous voltage drop of present embodiment, and Fig. 3 is that the instantaneous voltage drop of present embodiment hangs down the key diagram of the voltage protection work of protective device.Fig. 3 (a) schematically shows 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 schematically show 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 characteristic work of the low protective device of instantaneous voltage drop of present embodiment shown in Figure 1 is described with reference to Fig. 2, Fig. 3.In addition, at this, be that the situation of 100V is enumerated concrete magnitude of voltage and described to specified input voltage, but specified input voltage is not limited to this, certainly be suitable values such as 110V, 200V, 220V, 240V for example.
When the work of this device, carry out repeatedly among Fig. 2 in the work shown in the flow chart.Promptly; In control part 40; Input voltage detection unit 41 reads in the magnitude of voltage information (step S1) that this time point offers the input ac voltage of input 11 from input voltage test section 21, and whether decision voltage value is that 110% of specified input voltage is 110V (be equivalent to the of the present invention the 3rd and judge voltage) above (step S2).If in step S2, be judged as " denying ", then then judge above-mentioned magnitude of voltage whether not enough specified input voltage 90% be 90V (be equivalent to of the present invention first and judge voltage) and for 80% of specified input voltage be 80V (be equivalent to of the present invention second and judge voltage) above (step S3).If in step S3, be judged as " denying ", then then judge above-mentioned magnitude of voltage whether not enough specified input voltage 80% be 80V (as stated, be equivalent to second and judge voltage) (step S4).
In step S2, S3 and S4, all be judged to be under the situation of " denying ", input ac voltage be in specified input voltage more than 90% and the scope of less than 110% be (step S5) in the scope of the above and not enough 110V of 90V.Therefore; In this case; It is normal being judged as from providing of the alternating electromotive force of commercial ac power source 1, and switch control portion 43 is via any or a plurality of conducting state that is made as switched in first semiconductor switch 16 of drive division 33 with switching part 13, bidirectional triode thyristor 15, the electromagnetic relay 14.Thus; Be applied to the voltage of the terminal A of autotransformer 30; The alternating electromotive force that promptly offers input 11 from commercial AC power 1 is directly through output 12, and input ac voltage (wherein, removing the voltage that causes through switching part 13 reduces) is provided for load 2 (step S6) thus.
In this case, shown in Fig. 3 (b) it [A] and [D], corresponding to the change of input ac voltage; The alternating voltage maximum that offers load 2 changes ± 10% from specified input voltage, and is still, general; Permissible range as the input voltage change of the various device of load 2 is about ± 10% with respect to specified input voltage; As stated, even change about 10%, can not hinder the running of load 2 from the alternating voltage of this device output yet.Certainly, under the situation of the load of the permissible range littler (for example ± 5%) of known use input voltage change, the determinating reference in the change input voltage detection unit 41 gets final product.
In addition; 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; Making inverter 18 work via inverter driving portion 23, is direct current power with the input AC power conversions, comes electrolytic capacitor 17 is charged.In addition; Under the situation that is reduced to the less reduction of degree that the nature discharge caused of the charging voltage of electrolytic capacitor 17; Do not carry out charging rapidly, and compare charging slowly by additional Electricity Department 20 based on the ac/dc conversion work of inverter 18.This is identical with prior art.Through such charging, under the situation that input AC electric power is provided, electrolytic capacitor 17 is kept the state that roughly is full of electricity.
If because variation in voltage and input ac voltage drop to the voltage of the scope that is in the above and not enough 90V of 80V; Then in step S3, be judged to be " being "; Switch control portion 43 is made as conducting state via switching second semiconductor switch 31 of drive division 33 with switching part 13, and other switches are made as nonconducting state.Thus, connect the terminal B and the output 12 of autotransformers 30, will be applied to load 2 (step S8) from the input ac voltage alternating voltage that obtains after 10% that boosts via second semiconductor switch 31.If for example input ac voltage is reduced to 85V, the alternating voltage of about 93.5V then appears on the terminal B of autotransformer 30, it is applied to load 2 from output 12.That is, be more than 80% and under the situation of less than 90% of specified input voltage at input ac voltage, shown in Fig. 3 (b) it [B], the alternating voltage that obtains after the amount with input ac voltage raising 10% is applied to load 2.
If because identical variation in voltage and input ac voltage rises to more than the 110V; Then in step S2, be judged to be " being "; Switch control portion 43 is made as conducting state via switching the 3rd semiconductor switch 32 of drive division 33 with switching part 13, and other switches are made as nonconducting state.Thus, connect the terminal C and the output 12 of autotransformers 30 via the 3rd semiconductor switch 32, the alternating voltage that will obtain after the input ac voltage step-down 10% is applied to load 2 (step S7).If for example input ac voltage rises to 115V, the alternating voltage of about 103.5V then appears on the terminal C of autotransformer 30, it is applied to load 2 from output 12.That is, be under the situation more than 110% of specified input voltage at input ac voltage, shown in Fig. 3 (b) it [E], the alternating voltage that obtains after the amount with input ac voltage reduction by 10% is applied to load 2.
As more than; Input ac voltage be in specified input voltage more than 80% and the scope of less than 90% and be under the situation more than 110%; Do not use direct current power and the inverter 18 in electrolytic capacitor 17, accumulated, and continue the alternating electromotive force that provides the running that makes load 2 to proceed without barrier to load 2.Therefore, even in the bigger place of the variation in voltage of commercial ac power source 1, the running of load 2 does not stop yet.
On the other hand,, then in step S4, be judged to be " being ", carry out the instantaneous voltage drop minimum living nurse identical and make (step S9) with existing apparatus if input ac voltage drops to not enough 80V.That is, switch control portion 43 all breaks off the switch of switching part 13 via switching drive division 33, is that commercial ac power source 1 cuts off with autotransformer 30 with output 12 from input 11.Roughly simultaneously; Inverter control part 42 is in order to use the direct current power that remains in the electrolytic capacitor 17 to generate to become the alternative alternating electromotive force of target alternating voltage (for example 90% of specified input voltage), and makes inverter 18 carry out the AC/DC conversion work via inverter driving portion 23.Thus, replace the output voltage of input AC electric power and autotransformer 30, to load 2 alternative alternating electromotive force is provided via output 12 from electrolytic capacitor 17, inverter 18, filter 19.Therefore, shown in Fig. 3 (b) it [C],, also maintain 90% of specified input voltage for example to the alternating voltage of load 2 outputs even input ac voltage reduces owing to instantaneous voltage or moment stops to drop to 80% of not enough specified input voltage.But, be accumulated in the direct current power in the electrolytic capacitor 17 because consume this moment, thus the time that is equivalent to this direct current strength for example about 0.5～1 second during to load 2 alternating electromotive force is provided.
As stated; If drop to the state of not enough 80V returns to this voltage more than the 80V from input ac voltage; Then at least one switch in the switching part 13 is switched on, as stated, with input ac voltage or by autotransformer 30 boost or step-down after the alternating voltage that obtains offer load 2.
Shown in Fig. 3 (c), in the low protective device of existing instantaneous voltage drop,, 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 if input ac voltage drops to 90% of not enough specified input voltage.Thus, in the change (fluctuation) of for example input ac voltage under the situation of big (more than ± 10%), with the charged of frequently carrying out electrolytic capacitor 17.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, reduce and power failure input ac voltage change in addition for instantaneous voltage, use the electric power of accumulating of electrolytic capacitor 17 hardly.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.
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%, 80%, 110% such numerical value of enumerating out in the above-described embodiments promptly first to the 3rd judge voltage value and+to increase the numerical value that ratio, voltage reduce ratio only be an example for voltage in 10% ,-10% such autotransformer 30, certainly suitably change according to the device specification of having considered environment for use and purpose etc.
Claims (2)
1. an instantaneous voltage drop hangs down protective device, and it possesses:
Electricity accumulating unit, it is used to accumulate direct current power; And
Two-way inverter unit, it will convert direct current power into from the alternating electromotive force that commercial AC power provides, and come above-mentioned electricity accumulating unit is charged, and will convert alternating electromotive force into from the direct current power that this electricity accumulating unit discharges,
This instantaneous voltage drop hangs down protective device, and when the alternating voltage that offers load from commercial AC power temporarily reduces, replace it and utilize the direct current power that is accumulated in the above-mentioned electricity accumulating unit to load alternating electromotive force to be provided through above-mentioned two-way inverter unit,
The low protective device of this instantaneous voltage drop is characterised in that, comprising:
(a) voltage-adjusting unit; It is used for the input ac voltage that provides from commercial AC power as input, and taking-up is with boost first alternating voltage that obtains after the regulation ratio and with second alternating voltage that obtains after this input ac voltage step-down regulation ratio of this input ac voltage;
(b) switch unit, second alternating voltage that its first alternating voltage, this voltage-adjusting unit that is used for optionally exporting above-mentioned input ac voltage, above-mentioned voltage-adjusting unit and is produced is produced, the alternative alternating voltage that generates through the AC/DC conversion of being undertaken by above-mentioned bidirectional transducer unit any one;
(c) input voltage identifying unit; It detects above-mentioned input ac voltage, and judge this input ac voltage whether be lower than than specified input voltage low first judge voltage, whether be lower than than this first judge voltage low second judge voltage and whether be lower than than specified input voltage high the 3rd judge voltage; And
(d) control unit; It is controlled above-mentioned switch unit and above-mentioned two-way inverter unit; So that be first to judge more than the voltage and when judging that than the 3rd voltage is low,, be judged to be that above-mentioned input ac voltage judges than first that voltage is low and be that the second judgement voltage is when above to load output input ac voltage be judged to be input ac voltage through above-mentioned input voltage identifying unit; Export first alternating voltage to load; Being judged to be above-mentioned input ac voltage is the 3rd when judging that voltage is above, exports second alternating voltage to load, is being judged to be above-mentioned input ac voltage when judging that than second voltage hangs down; Make above-mentioned two-way inverter unit work, 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 voltage-adjusting unit uses autotransformer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010275257A JP2012125085A (en) | 2010-12-10 | 2010-12-10 | Instantaneous voltage drop protection device |
| JP2010-275257 | 2010-12-10 |
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| Publication Number | Publication Date |
|---|---|
| CN102545372A true CN102545372A (en) | 2012-07-04 |
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| CN2011101864341A Pending CN102545372A (en) | 2010-12-10 | 2011-07-05 | Instantaneous voltage reduction protecting device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2012125085A (en) |
| CN (1) | CN102545372A (en) |
| TW (1) | TW201230614A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801333A (en) * | 2012-08-13 | 2012-11-28 | 北京星网锐捷网络技术有限公司 | Voltage supplying device |
| CN104953696A (en) * | 2014-03-27 | 2015-09-30 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | On-line interactive uninterrupted power source |
| CN108155812A (en) * | 2018-01-16 | 2018-06-12 | 深圳市赛格瑞电子有限公司 | A kind of ac conversion circuit |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767808B (en) * | 2018-05-29 | 2020-05-05 | 株洲易力达机电有限公司 | EPS controller power supply diagnosis and protection system and method |
-
2010
- 2010-12-10 JP JP2010275257A patent/JP2012125085A/en active Pending
-
2011
- 2011-07-05 CN CN2011101864341A patent/CN102545372A/en active Pending
- 2011-08-12 TW TW100128840A patent/TW201230614A/en unknown
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801333A (en) * | 2012-08-13 | 2012-11-28 | 北京星网锐捷网络技术有限公司 | Voltage supplying device |
| CN104953696A (en) * | 2014-03-27 | 2015-09-30 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | On-line interactive uninterrupted power source |
| CN104953696B (en) * | 2014-03-27 | 2019-06-28 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | Line interaction uninterruptible power supply |
| CN108155812A (en) * | 2018-01-16 | 2018-06-12 | 深圳市赛格瑞电子有限公司 | A kind of ac conversion circuit |
| CN108155812B (en) * | 2018-01-16 | 2024-03-19 | 深圳市赛格瑞电子有限公司 | Alternating current conversion circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012125085A (en) | 2012-06-28 |
| TW201230614A (en) | 2012-07-16 |
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Application publication date: 20120704 |