CN102957190B - Square wave UPS (uninterrupted power supply) mode switching control method and square wave UPS - Google Patents
Square wave UPS (uninterrupted power supply) mode switching control method and square wave UPS Download PDFInfo
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- CN102957190B CN102957190B CN201210443146.4A CN201210443146A CN102957190B CN 102957190 B CN102957190 B CN 102957190B CN 201210443146 A CN201210443146 A CN 201210443146A CN 102957190 B CN102957190 B CN 102957190B
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Abstract
The invention discloses a square wave UPS mode switching control method and a square wave UPS. The control method includes the following steps: (1) load capacities are divided into n groups according to 0 percent to 100 percent, and the standard square wave width corresponding to each of the n groups is stored; (2) the load capacity of the square wave UPS in output connection under a mains supply mode is detected before the square wave UPS is switched into a battery mode; (3) the range of the group in the n groups, into which the load capacity detected in step 2 falls, is judged, and the load capacity is assumed to fall into the range of the kth group; (4) the square wave width of the output voltage of the first cycle is regulated to the standard square wave width of the kth group after the square wave UPS is switched into the battery mode. The square wave UPS mode switching control method and the square wave UPS can adopt a range-corresponding standard square wave width to regulate the square wave width of UPS output voltage according to the range into which the load capacity falls, the invention can remarkably improve the on-load operating performance during mode switching in comparison with the state setting the square wave width as a fixed value, and in particular, an APFC (Active Power Factor Correction) load can be driven to normally operate.
Description
Technical field
The present invention relates to the control method of uninterrupted power supply (Uninterrupted Power Supply, be called for short UPS), particularly relate in a kind of UPS control method when utility mode is switched to battery mode.
Background technology
UPS has good power supply performance, has become the power supply of often using in electronic information.As shown in Figure 1, be the exemplary block diagram of existing UPS.UPS100 comprises AC/AC transducer, inverter and battery module.When UPS works at utility mode, AC/AC transducer is converted to the alternating current of civil power Vin the alternating current needing, after being communicated with by diverter switch 300, and output voltage V out powering load.When UPS works at battery mode, battery module output dc voltage is to inverter, and inverter is converted to this direct voltage receiving the alternating current needing, after being communicated with by diverter switch 300, and output voltage V out powering load.Wherein, in order to improve power consumption efficiency, when civil power is normal, conventionally do not use the utility mode conversion electric power output power supply of UPS, but be directly communicated with bypass loop 200 by diverter switch 300, by bypass loop 200, directly civil power Vin is exported to load supplying, now Vout equals alternating current Vin.This diverter switch 300 is generally relay, also can be IGBT switching tube, switch mosfet pipe etc.
During the work of above-mentioned power-supply system, when utility mode is switched to battery mode, output voltage V out there will be and drags down phenomenon.UPS institute bringing onto load capacity is larger, and output voltage V out during switching drags down lowlyer, has influence on sometimes the normal work of load.Conventionally, if load is R load, RCD load (resistance R, capacitor C and diode D), Switching Power Supply (Switching Power Supply, be called for short SPS) load, when UPS switches, drag down phenomenon not serious, drag down a little and still can drive R load, RCD load, the normal work of SPS load, but the performance in when work can be affected.If but load is while being APFC power supply (Active Power Factor Correction, be called for short APFC) load, it is very serious that UPS drags down phenomenon while switching, and directly causes driving the situation of APFC loaded work piece.This is also that present most of UPS, particularly square wave UPS be not with the reason of APFC loaded work piece.If must drive its work, the measure of conventionally taking is the hardware configuration that improves square wave UPS itself, by increasing into original realization.
Summary of the invention
Technical problem to be solved by this invention is: make up above-mentioned the deficiencies in the prior art, control method and square wave UPS while proposing a kind of square wave UPS pattern switching, do not need to increase when cost can be controlled the switching of square wave UPS pattern and improve bringing onto load service behaviour, especially can drive APFC load normally to work.
Technical problem of the present invention is solved by following technical scheme:
Control method when square wave UPS pattern is switched, comprises the following steps: 1) load capacity is divided into n group according to 0～100%, in storage n group, each organizes corresponding standard square width; 2) detect described square wave UPS and be converted to the load capacity that under the front utility mode of battery mode, output connects; 3) judge described step 2) n component class range that the load capacity that detects falls into, be made as in the scope that falls into k group; 4) square width that regulates described square wave UPS to be converted to the output voltage in first cycle after battery mode is the standard square width of described k group.
Technical problem of the present invention is solved by following further technical scheme:
A square wave UPS, comprises the control device of controlling when described UPS pattern is switched, and described control device comprises memory module, detection module, judge module and adjustment module; Described memory module stores that in n group, each organizes corresponding standard square width; The n group of described n group for obtaining after load capacity is divided according to 0～100%; Described detection module detects described square wave UPS and is converted to the load capacity that under the front utility mode of battery mode, output connects; The input of described judge module connects the output of described detection module, and the n component class range that judgement load capacity falls into is made as in the scope that falls into k group; Two inputs of described adjustment module connect respectively the output of described memory module and described judge module, and the square width that regulates described square wave UPS to be converted to the output voltage in first cycle after battery mode is the standard square width of described k group.
The beneficial effect that the present invention is compared with the prior art is:
Control method and square wave UPS when square wave UPS pattern of the present invention is switched, square width corresponding to many groups standard R load capacity based on test storage, thereby when switching, according to load capacity, set the square width of UPS in first cycle of battery mode, be specially the scope falling into according to load capacity, standard square width corresponding to the scope of getting regulates the square width of UPS output voltage, with respect to square width being made as to the situation of fixed value, although the peak value of output voltage is still dragged down, but the effective value of output voltage drags down phenomenon and makes moderate progress, bringing onto load service behaviour when thereby improvement pattern is switched, during particularly for APFC load, can drive it normally to work.Control method and UPS when UPS pattern of the present invention is switched, while controlling the switching of UPS pattern, improve its bringing onto load performance, particularly can tenaculum APFC load normally work, control method realizes on common UPS, thereby changed in the past, must drive by increasing hardware cost the present situation of APFC loaded work piece.
Accompanying drawing explanation
Fig. 1 is the structural representation of UPS in prior art;
Fig. 2 is the flow chart of control method when square wave UPS pattern is switched in the specific embodiment of the invention one;
Fig. 3 is output voltage waveform in pattern handoff procedure when square wave UPS connects the load of 0～30% load capacity in the specific embodiment of the invention one;
Fig. 4 is output voltage waveform in pattern handoff procedure when square wave UPS connects the load of 30%～70% load capacity in the specific embodiment of the invention one;
Fig. 5 is output voltage waveform in pattern handoff procedure when square wave UPS connects the load of 70%～100% load capacity in the specific embodiment of the invention one;
Fig. 6 is output voltage waveform when a kind of square wave UPS connection APFC loads on pattern switching in prior art;
Fig. 7 is output voltage waveform when square wave UPS connection APFC loads on pattern switching in the specific embodiment of the invention one;
Fig. 8 is the structural representation of the control device in UPS in the specific embodiment of the invention;
Fig. 9 is output voltage waveform when another kind of square wave UPS connection APFC loads on pattern switching in prior art;
Figure 10 is output voltage waveform when square wave UPS connection APFC loads on pattern switching in the specific embodiment of the invention three.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing the present invention is described in further details.
Embodiment one
As shown in Figure 2, the flow chart of the control method while switching for the square wave UPS pattern in this embodiment, comprises the following steps:
P1) load capacity is divided into n group according to 0～100%, in storage n group, each organizes corresponding standard square width.In this embodiment, standard square width is the less square width in corresponding square width under two load capacities in each group, first load capacity is near value minimum load capacity in group, the value that refers to the first load capacity herein meets: minimum load capacity * 110% scope in minimum load capacity≤first load capacity≤group in group, corresponding square width is: when described square wave UPS connects the R load of this minimum load capacity, regulation output voltage reaches the square width while approaching output voltage upper specification limit, approach herein and refer to that the value of output voltage meets: output voltage upper specification limit * 90%≤output voltage≤output voltage upper specification limit.Second load capacity is in organizing interior middle load capacity ± 10% scope, and corresponding square width is: when described square wave UPS connects the R load of this second load capacity, and square width when regulation output voltage reaches rated voltage ± 10% scope.
In this embodiment, take rated voltage as 230V, ± 10% voltage range of floating, output voltage upper specification limit value is that the square wave UPS of 230 * (1+10%)=253V is that example describes.According to 0～100%, be divided into 3 groups, be respectively: first group is 0≤load capacity < 30%, second group is 30%≤load capacity < 70%, the 3rd group is 70%≤load capacity≤100%, will store the standard square width of first group, the standard square width of the standard square width of second group and the 3rd group is 3 values altogether.For first group of 0≤load capacity < 30%, its standard square width is a smaller who is worth in corresponding square width of load capacity in the middle of near value minimum load capacity (0) in group and group (15%) ± 10% scope.In like manner, for second group of 30%≤load capacity < 70%, its standard square width is a smaller who is worth in corresponding square width of load capacity in the middle of near value minimum load capacity (30%) in group and group (50%) ± 10% scope, for the 3rd group of 70%≤load capacity≤100%, its standard square width is a smaller who is worth in corresponding square width of load capacity in the middle of near value minimum load capacity (70%) in group and group (85%) ± 10% scope.In this embodiment, each group is all chosen in group minimum load capacity (0,30% and 70%) as first load capacity, all chooses middle load capacity (15%, 50% and 85%) as second load capacity square width that settles the standard.Certainly, in other embodiments, first load capacity also can be chosen near other value minimum load capacity in group, as gets 1%, 32%, 73% respectively as first load capacity and then the square width that settles the standard in three groups.Also near the value in the middle of can be taken as load capacity, as get 16%, 53%, 82% respectively as second load capacity in three groups and then the square width that settles the standard, inevitable as be minimum load capacity or middle load capacity just in this embodiment.To sum up, in this embodiment, for above-mentioned 3 component groups, need to first measure and determine that load capacity is 0,15%, 30%, 50%, the square width of the output voltage of 70%, 85% correspondence.In this embodiment, getting square width corresponding to first load capacity is: when described square wave UPS connects the R load of this first load capacity, square width when regulation output voltage reaches output voltage upper specification limit (253V), in alternate manner, also near desirable value it, square width during as 250V is also feasible.Getting second square width corresponding to load capacity is: when described square wave UPS connects the R load of this second load capacity, square width when regulation output voltage reaches output voltage rated voltage (230V), in alternate manner, also near desirable value it, square width during as 220V is also feasible.
For square width corresponding to minimum load capacity in each group, the square width of first group of internal burden capacity 0 correspondence for example, for: when the load of UPS output connection is zero load, regulate square wave UPS output voltage to reach output voltage upper specification limit value 253V, test the now square width of square wave UPS output voltage, be the square width that load capacity is 0 correspondence.In like manner, square width for second group of minimum load capacity 30% or the 3rd group of minimum load capacity 70% correspondence, while being 30% or 70% R load for: the load connecting when UPS output, regulate square wave UPS output voltage to reach output voltage upper specification limit value 253V, test the now square width of output voltage, be the square width that load capacity is 30% or 70% correspondence.In this embodiment, while testing above-mentioned 3 load capacities, corresponding square width is 3.2ms, 4.5ms, 5.4ms.
For being worth corresponding square width near middle load capacity in each group, the square width of first group of internal burden capacity 15% correspondence for example, for: during R load that the load connecting when UPS output is 15%, while regulating square wave UPS output voltage to reach rated voltage 230V, test the now square width of square wave UPS output voltage, be the square width that load capacity is 15% correspondence.In like manner, square width for second load capacity 85% correspondence in second load capacity 50% in second group or the 3rd group, while being 50% or 80% R load for the load connecting when UPS output, while regulating square wave UPS output voltage to reach rated voltage 230V, test the now square width of square wave UPS output voltage, be the square width that load capacity is 50% or 80% correspondence.In this embodiment, while testing above-mentioned 3 load capacities, corresponding square width is 3.5ms, 4.2ms, 6ms.
According to square wave UPS output voltage effective value Vrms, the relational expression between peak value Vpk and square-wave pulse width:
, in the cycle that wherein T is output voltage, Pw is half cycle square-wave pulse width, the civil power of frequency f=50Hz of take is example explanation, is T=1/f=1/50Hz=20ms.Known from formula, square width Pw and output voltage effective value, peak value has relation.And different according to load capacity, when pattern is switched, the peak value of output voltage drags down situation difference, and general load capacity is larger, and peak value drags down lower.Therefore under concrete a certain load capacity, after crest voltage is dragged down, corresponding to actual conditions debugging square width, under one party wave width value, make current square wave UPS circuit output voltage effective value Vrms reach upper specification limit value (253V) or rated voltage (230V), obtain square width corresponding under this load capacity.
Thus, in this embodiment, be divided into 3 groups, the standard square width of first group of 0≤load capacity < 30% is counterparty's wave width smaller in 0 and 15%, i.e. the square width 3.2ms of 0 correspondence.Second group is that the standard square width of 30%≤load capacity < 70% is counterparty's wave width smaller in 30% and 50%, i.e. 50% counterparty's wave width 4.2ms.The 3rd group is that the standard square width of 70%≤load capacity≤100% is counterparty's wave width smaller in 70% and 85%, i.e. 70% counterparty's wave width 5.4ms.
P2) detect square wave UPS and be converted to the load capacity that under the front utility mode of battery mode, output connects.When general modfel is changed, load capacity is constant, so the load capacity that last cycle output of utility mode operation connects also switches the load capacity that under rear battery mode, output connects.The load that UPS output herein connects can be R load, RCD load, SPS load, in APFC load any one.In this embodiment, for connecting APFC load running.As for the method that detects load capacity, be comparatively ripe technology, at this, do not describe in detail.
P3) judge described step P2) n component class range that the load capacity that detects falls into, be made as in the scope that falls into k group.
P4) square width that regulates square wave UPS to be converted to the output voltage in first cycle after battery mode is the standard square width of k group.
In this embodiment, if step P2) detecting the UPS load capacity that under utility mode, output connects before being converted to battery mode is 25%, it falls in the scope of first group 0～30%, therefore regulates the standard square width 3.2ms that the square width of the output voltage in first cycle under current square wave UPS battery pattern is this group.Also be in this embodiment, as long as while connecting the APFC load within the scope of 0～30% load capacity, the square width that all regulates the output voltage in first cycle under square wave UPS battery pattern is 3.2ms, the oscillogram of its handoff procedure output voltage as shown in Figure 3, the APFC load that is 0～30% for load capacity, after t1 moment switch mode, all the square width T1 of regulation output voltage is 3.2ms.
If step P2) detecting the UPS load capacity that under utility mode, output connects before being converted to battery mode is 60%, it falls in the scope of second group 30%～70%, therefore regulates the standard square width 4.2ms that the square width of the output voltage in first cycle under current square wave UPS battery pattern is this group.Also be in this embodiment, as long as while connecting the APFC load within the scope of 30%～70% load capacity, the square width that all regulates the output voltage in first cycle under square wave UPS battery pattern is 4.2ms, the oscillogram of its handoff procedure output voltage as shown in Figure 4, the APFC load that is 30%～70% for load capacity, after t1 moment switch mode, all the square width T2 of regulation output voltage is 4.2ms.
If step P2) detecting the UPS load capacity that under utility mode, output connects before being converted to battery mode is 80%, it falls in the scope of the 3rd group 70%～100%, regulates the standard square width 5.4ms that the square width of the output voltage in first cycle under current square wave UPS battery pattern is this group.Also be in this embodiment, as long as while connecting the APFC load within the scope of 70%～100% load capacity, the square width that all regulates the output voltage in first cycle under square wave UPS battery pattern is 5.4ms, the oscillogram of its handoff procedure output voltage as shown in Figure 5, the APFC load that is 70%～100% for load capacity, after t1 moment switch mode, all the square width T3 of regulation output voltage is 5.4ms.
After controlling according to the method described above, while being R load as connected load, in prior art, while connecting R load, the UPS output voltage of leaving when pattern is switched drags down and does not carry out any control, and the square width of output voltage is certain value, be generally unloaded, load capacity is the square width value of 0 o'clock.As pressed in this embodiment, when unloaded, square width is 3.2ms, is set to all the time definite value 3.2ms, and, if load capacity is 0～30%, crest voltage on average drags down 2%, and corresponding output voltage effective value also can drag down 2%; While being 30%～70% as load capacity, crest voltage drags down 5%, and corresponding output voltage effective value also can drag down 5%; While being 70%～100% as load capacity, crest voltage drags down 7%, and corresponding output voltage effective value also can drag down 7%.And in this embodiment, load capacity is in 30%～70% scope time, setting its square width is i.e. 50% load capacity of 4.2ms(, output voltage effective value Vrms is corresponding square width while being rated voltage 230V), with respect to being set to all the time 3.2ms in prior art, improved square-wave pulse width like this, thereby the part that has neutralized output voltage effective value drags down, make to increase to some extent in the relative prior art of corresponding output voltage effective value, be unlikely to drag down 5%, may drag down 3%.Output voltage effective value does not draw lowlyer, so can improve its follow-up service behaviour.And RCD load, the characteristic of SPS load and R load has similar part, is to take R load as standard, so even if present load is RCD load, during SPS load, also can guarantee RCD load, the improvement of the service behaviour of SPS load during testing standard square width.
If be APFC load and connect load, they are different from the characteristic of R load, RCD load, SPS load, need to be by actual testing authentication.Adopt same UPS, at the APFC power supply that connects the good model of same boat, as load, load capacity is tested for being fully loaded with 100%.When UPS pattern is switched in prior art, do not carry out any control, the UPS output voltage waveform obtaining as shown in Figure 6.And according to above-mentioned steps, when pattern is switched, control in this embodiment, the UPS output voltage waveform obtaining is as shown in Figure 7.Comparison diagram 6 and Fig. 7, can find out, in prior art Fig. 6 pattern switch after under battery mode the square width in first cycle to be set as 3.2ms constant, and when in this embodiment Fig. 7, pattern is switched, load capacity because of 100% falls in 70%～100% scope, gets the square width that the 3rd group of standard square width 5.4ms arranges first cycle under battery mode.As can be seen from Figure 6, while being with APFC load in prior art, because output voltage is too low, follow-up the 3rd, the period 4 is 53.1V only, is finally forced to output shutdown, cannot drive APFC load normally to work.And in Fig. 7, according to the control method of this embodiment, after switching, the waveform stabilization of output voltage is constant, during to second period, be stabilized in 220V, work after can realizing the normal switching with APFC load.
In this embodiment, also provide a kind of UPS, it comprises the control device of controlling when UPS pattern is switched.As shown in Figure 8, be the electrical block diagram of control device, control device comprises memory module 501, detection module 502, judge module 503 and adjustment module 504.
Wherein, memory module 501 stores that in n group, each organizes corresponding standard square width; The n group of n group for obtaining after load capacity is divided according to 0～100%; In this embodiment, standard square width is the less square width in square width corresponding to two load capacities in each group; First load capacity is minimum value load capacity in group, corresponding square width is for when square wave UPS connects the R load of this load capacity, square width when regulation output voltage reaches output voltage upper specification limit, second load capacity is in organizing interior middle load capacity ± 10% scope, corresponding square width is when square wave UPS connects the R load of this load capacity, square width when regulation output voltage reaches in rated voltage ± 10% scope.In this embodiment, be divided into as previously mentioned 3 groups, so memory module 501 storage is the standard square width value of 3 groups, is respectively 3.2ms, 4.2ms and 5.4ms.
Detection module 502 detects square wave UPS and is converted to the load capacity that under the front utility mode of battery mode, output connects.
The output of the input connection detection module 502 of judge module 503, the n component class range that judgement load capacity falls into, is made as in the scope that falls into k group.
Two inputs of adjustment module 504 connect respectively the output of memory module 501 and judge module 503, and the square width that regulates square wave UPS to be converted to the output voltage in first cycle after battery mode is the standard square width of k group.If the load capacity that the i.e. current output of UPS connects is 25%, it falls into the scope of first group 0%～30%, and the square width that regulates the output voltage in first cycle under current UPS battery pattern is the standard square width 3.2ms of first group.If the load capacity that the current output of UPS connects is 60%, it falls in the scope of second group 30%～70%, and the square width that regulates the output voltage in first cycle under current UPS battery pattern is the standard square width 4.2ms of second group.If the load capacity that the current output of UPS connects is 80%, it falls in the scope of the 3rd group 70%～100%, and the square width that regulates the output voltage in first cycle under current UPS battery pattern is 5.4ms.
Square wave UPS in this embodiment, comprises above-mentioned control device, in band R load, when RCD load and SPS loaded work piece, during switching, by the control of control device, make output voltage effective value drag down degree lighter with respect to prior art, so can improve its follow-up service behaviour.Especially when band APFC load, during switching, by the control of control device, work after can realizing the normal switching with APFC load.
Embodiment two
This embodiment is with the difference of execution mode one: in this embodiment, being to be divided into the grouping situation of 5 groups, in embodiment one, is to be divided into the grouping situation of 3 groups.
In this embodiment, control method when UPS pattern is switched, in the first step, is divided into 5 groups by load capacity according to 0～100%, stores the standard square width of 5 groups.Standard square width of each group be the smaller in the square width value of output voltage of correspondence under two load capacities in each group in each group.Wherein, 5 groups are respectively: first group of 0≤load capacity < 30%, second group of 30%≤load capacity < 40%, the 3rd group of 40%≤load capacity < 50%, the 4th group of 50%≤load capacity≤70%, the 5th group of 70%≤load capacity≤100%.First load capacity is minimum load capacity (being respectively 0,30%, 40%, 50%, 70%) in group, and corresponding square width is: when square wave UPS connects the R load of this minimum load capacity, and square width when regulation output voltage reaches output voltage upper specification limit.Second load capacity is for (to be respectively 16%, 36%, 46% than the load capacity of middle load capacity large 1%, 61%, 86%), corresponding square width is: when square wave UPS connects the R load of this load capacity, and square width when regulation output voltage reaches rated voltage.The standard square width of first group is the less square width in the square width of load capacity 0 and 16% correspondence, the standard square width of second group is the less square width in the square width of load capacity 30% and 36% correspondence, the standard square width of the 3rd group is the less square width in the square width of load capacity 40% and 46% correspondence, the standard square width of the 4th group is the less square width in the square width of load capacity 50% and 61% correspondence, the standard square width of the 5th group is the less square width in the square width of load capacity 70% and 86% correspondence.
Second step to the four steps, with step P2 in embodiment one) to P4) identical respectively, in this not repeat specification.Particularly, in the 4th step, divide 5 kinds of situations: 1), if the load capacity that the current output of UPS connects is 25%, it falls into the scope of first group 0%～30%, and the square width that regulates the output voltage in first cycle under current UPS battery pattern is the standard square width of first group.2) if the load capacity that the current output of UPS connects is 35%, it falls in the scope of second group 30%～40%, and the square width that regulates the output voltage in first cycle under current UPS battery pattern is the standard square width of second group.3) if the load capacity that the current output of UPS connects is 48%, it falls in the scope of the 3rd group 40%～50%, and the square width that regulates the output voltage in first cycle under current UPS battery pattern is the square width of the 3rd group.4) if the load capacity that the current output of UPS connects is 63%, it falls in the scope of the 4th group 50%～70%, and the square width that regulates the output voltage in first cycle under current UPS battery pattern is the square width of the 4th group.5) if the load capacity that the current output of UPS connects is 89%, it falls in the scope of the 5th group 70%～100%, and the square width that regulates the output voltage in first cycle under current UPS battery pattern is the square width of the 5th group.
In sum, known, if grouping is more, it is more careful to divide, more accurate during for square width after certain loads capacity regulating switching, more can make output voltage approach rated voltage.
In this embodiment, divide into groups different from embodiment one, grouping with respect to embodiment one is more careful, it can realize effect equally: in band R load, when RCD load and SPS loaded work piece, during switching, by controlling, make output voltage effective value drag down degree lighter with respect to prior art, can improve load follow-up work performance.When band APFC load, during switching, by controlling, work after can realizing the normal switching with APFC load.
Embodiment three
This embodiment is with the difference of execution mode one: in this embodiment, standard square width is to get a square width that load capacity is corresponding in each group.And in embodiment one, be according to the square width that settles the standard of the smaller in square width corresponding to two load capacities in each group.
Control method when the square wave UPS pattern in this embodiment is switched, comprises the following steps:
P1) load capacity is divided into n group according to 0～100%, in storage n group, each organizes corresponding standard square width.Wherein in this embodiment, standard square width is corresponding square width under a load capacity in each group, described load capacity is near value minimum load capacity in group, the value that refers to described load capacity herein meets: minimum load capacity * 110% scope in minimum load capacity≤first load capacity≤group in group, corresponding square width is: when described square wave UPS connects the R load of this minimum load capacity, regulation output voltage reaches the square width while approaching output voltage upper specification limit, approach herein and refer to that the value of output voltage meets: output voltage upper specification limit * 90%≤output voltage≤output voltage upper specification limit.
In this embodiment, take rated voltage as 230V, ± 10% voltage range of floating, output voltage upper specification limit value is that the square wave UPS of 230 * (1+10%)=253V is that example describes.According to 0～100%, be divided into 3 groups, be respectively: first group is 0≤load capacity < 30%, second group is 30%≤load capacity < 70%, the 3rd group is 70%≤load capacity≤100%, will store the standard square width of first group, the standard square width of the standard square width of second group and the 3rd group is 3 values altogether.For first group of 0≤load capacity < 30%, its standard square width is worth corresponding square width for one near minimum load capacity (0) in group.In like manner, for second group of 30%≤load capacity < 70%, its standard square width is worth corresponding square width for one near minimum load capacity (30%) in group, for the 3rd group of 70%≤load capacity≤100%, its standard square width is worth corresponding square width for one near minimum load capacity (70%) in group.In this embodiment, each group is all chosen in group minimum load capacity (0,30% and 70%) as first load capacity square width that settles the standard.Certainly, in other embodiments, first load capacity also can be chosen near other value minimum load capacity in group, as gets 1%, 32%, 73% respectively as first load capacity and then the square width that settles the standard in three groups.To sum up, in this embodiment, for above-mentioned 3 component groups, need to first measure and determine that load capacity is the square width of the output voltage of 0,30%, 70% correspondence.In this embodiment, getting corresponding square width is: when described square wave UPS connects the R load of this minimum load capacity, square width when regulation output voltage reaches output voltage upper specification limit, in alternate manner, also near desirable value it, square width during as 243V, 240V is also feasible.
For square width corresponding to minimum load capacity in each group, the square width of first group of internal burden capacity 0 correspondence for example, for: when the load of UPS output connection is zero load, regulate square wave UPS output voltage to reach 253V, test the now square width of square wave UPS output voltage, be the square width that load capacity is 0 correspondence.In like manner, square width for second group of minimum load capacity 30% or the 3rd group of minimum load capacity 70% correspondence, while being 30% or 70% R load for: the load connecting when UPS output, regulate square wave UPS output voltage to reach 253V, test the now square width of output voltage, be the square width that load capacity is 30% or 70% correspondence.In this embodiment, while testing above-mentioned 3 load capacities, corresponding square width is 3.2ms, 6.5ms, 8.6ms.
According to square wave UPS output voltage effective value Vrms, the relational expression between peak value Vpk and square-wave pulse width:
, in the cycle that wherein T is output voltage, Pw is half cycle square-wave pulse width, the civil power of frequency f=50Hz of take is example explanation, T=1/f=1/50Hz=20ms.Known from formula, square width Pw and output voltage effective value, peak value has relation.And different according to load capacity, when pattern is switched, the peak value of output voltage drags down situation difference, and general load capacity is larger, and peak value drags down lower.Therefore under concrete a certain load capacity, after crest voltage is dragged down, correspondingly according to actual conditions debugging square width, under one party wave width value, make current square wave UPS circuit output voltage effective value Vrms reach 253V, obtain square width corresponding under this load capacity.
Thus, in this embodiment, be divided into 3 groups, the standard square width of first group of 0≤load capacity < 30% is 0 counterparty's wave width, i.e. 3.2ms.Second group is that the standard square width of 30%≤load capacity < 70% is 30% counterparty's wave width, i.e. 6.5ms.The 3rd group is that the standard square width of 70%≤load capacity≤100% is 70% counterparty's wave width, i.e. 8.6ms.
P2) detect square wave UPS and be converted to the load capacity that under the front utility mode of battery mode, output connects.When general modfel is changed, load capacity is constant, so the load capacity that last cycle output of utility mode operation connects also switches the load capacity that under rear battery mode, output connects.The load that UPS output herein connects can be R load, RCD load, SPS load, in APFC load any one.In this embodiment, for connecting APFC load running.As for the method that detects load capacity, be comparatively ripe technology, at this, do not describe in detail.
P3) judge described step P2) n component class range that the load capacity that detects falls into, be made as in the scope that falls into k group.
P4) square width that regulates square wave UPS to be converted to the output voltage in first cycle after battery mode is the standard square width of k group.
In this embodiment, if step P2) detecting the UPS load capacity that under utility mode, output connects before being converted to battery mode is 25%, it falls in the scope of first group 0～30%, therefore regulates the standard square width 3.2ms that the square width of the output voltage in first cycle under current square wave UPS battery pattern is this group.Also be in this embodiment, as long as while connecting the APFC load within the scope of 0～30% load capacity, the square width that all regulates the output voltage in first cycle under square wave UPS battery pattern is 3.2ms.
If step P2) detecting the UPS load capacity that under utility mode, output connects before being converted to battery mode is 60%, it falls in the scope of second group 30%～70%, therefore regulates the standard square width 6.5ms that the square width of the output voltage in first cycle under current square wave UPS battery pattern is this group.Also be in this embodiment, as long as while connecting the APFC load within the scope of 30%～70% load capacity, the square width that all regulates the output voltage in first cycle under square wave UPS battery pattern is 6.5ms.
If step P2) detecting the UPS load capacity that under utility mode, output connects before being converted to battery mode is 80%, it falls in the scope of the 3rd group 70%～100%, regulates the standard square width 8.6ms that the square width of the output voltage in first cycle under current square wave UPS battery pattern is this group.Also be in this embodiment, as long as while connecting the APFC load within the scope of 70%～100% load capacity, the square width that all regulates the output voltage in first cycle under square wave UPS battery pattern is 8.6ms.
After controlling according to the method described above, while being R load as connected load, in prior art, while connecting R load, the UPS output voltage of leaving when pattern is switched drags down and does not carry out any control, and the square width of output voltage is certain value, be generally unloaded, load capacity is the square width value of 0 o'clock.As pressed in this embodiment, when unloaded, square width is 3.2ms, is set to all the time definite value 3.2ms, and, if load capacity is 0～30%, crest voltage on average drags down 2%, and corresponding output voltage effective value also can drag down 2%; While being 30%～70% as load capacity, crest voltage drags down 5%, and corresponding output voltage effective value also can drag down 5%; While being 70%～100% as load capacity, crest voltage drags down 7%, and corresponding output voltage effective value also can drag down 7%.And in this embodiment, load capacity is in 30%～70% scope time, setting its square width is i.e. 30% load capacity of 6.5ms(, output voltage effective value Vrms is corresponding square width while being 253V), with respect to being set to all the time 3.2ms in prior art, improved square-wave pulse width like this, thereby the part that has neutralized output voltage effective value drags down, make to increase to some extent in the relative prior art of corresponding output voltage effective value, be unlikely to drag down 5%, may drag down 3%.Output voltage effective value does not draw lowlyer, so can improve its follow-up service behaviour.And RCD load, the characteristic of SPS load and R load has similar part, is to take R load as standard, so even if present load is RCD load, during SPS load, also can guarantee RCD load, the improvement of the service behaviour of SPS load during testing standard square width.
If be APFC load and connect load, they are different from the characteristic of R load, RCD load, SPS load, need to be by actual testing authentication.Adopt same UPS, at the APFC power supply that connects same Great Wall model, as load, load capacity is tested for being fully loaded with 100%.When UPS pattern is switched in prior art, do not carry out any control, the UPS output voltage waveform obtaining as shown in Figure 9.And according to above-mentioned steps, when pattern is switched, control in this embodiment, the UPS output voltage waveform obtaining is as shown in figure 10.Comparison diagram 9 and Figure 10, can find out, in prior art Fig. 9 pattern switch after under battery mode the square width in first cycle to be set as 3.2ms constant, and when in this embodiment Figure 10, pattern is switched, load capacity because of 100% falls in 70%～100% scope, gets the square width that the 3rd group of standard square width 8.6ms arranges first cycle under battery mode.As can be seen from Figure 9, while being with APFC load in prior art, front several cyclings are very unstable, and the first, output voltage second round 156.3V only, need to could drive APFC load to enter normal operating conditions through five or six cycles.And in Figure 10, according to the control method of this embodiment, after switching, the waveform stabilization of output voltage is constant, during to second period, output voltage has reached 250V, it is the control method of this embodiment, during band APFC loaded work piece, after switching, can make APFC load fast and stable and enter normal operating conditions.
In this embodiment, also provide a kind of UPS, it comprises the control device of controlling when UPS pattern is switched.Control device comprises memory module, detection module, judge module and adjustment module.
Wherein, memory module stores that in n group, each organizes corresponding standard square width; The n group of n group for obtaining after load capacity is divided according to 0～100%; In this embodiment, standard square width is a square width that load capacity is corresponding in each group; Described load capacity is the interior minimum value load capacity of group, and corresponding square width is when square wave UPS connects the R load of this load capacity, square width when regulation output voltage reaches output voltage upper specification limit value (253V).In this embodiment, be divided into as previously mentioned 3 groups, so memory module storage is the standard square width value of 3 groups, is respectively 3.2ms, 6.5ms and 8.6ms.
Detection module detects square wave UPS and is converted to the load capacity that under the front utility mode of battery mode, output connects.
The output of the input connection detection module of judge module, the n component class range that judgement load capacity falls into, is made as in the scope that falls into k group.
Two inputs of adjustment module connect respectively the output of memory module and judge module, and the square width that regulates square wave UPS to be converted to the output voltage in first cycle after battery mode is the standard square width of k group.If the load capacity that the i.e. current output of UPS connects is 25%, it falls into the scope of first group 0%～30%, and the square width that regulates the output voltage in first cycle under current UPS battery pattern is the standard square width 3.2ms of first group.If the load capacity that the current output of UPS connects is 60%, it falls in the scope of second group 30%～70%, and the square width that regulates the output voltage in first cycle under current UPS battery pattern is the standard square width 6.5ms of second group.If the load capacity that the current output of UPS connects is 80%, it falls in the scope of the 3rd group 70%～100%, and the square width that regulates the output voltage in first cycle under current UPS battery pattern is 8.6ms.
Square wave UPS in this embodiment, comprises above-mentioned control device, in band R load, when RCD load and SPS loaded work piece, during switching, by the control of control device, make output voltage effective value drag down degree lighter with respect to prior art, so can improve its follow-up service behaviour.Especially when band APFC load, during switching, by the control of control device, work after can realizing the normal switching with APFC load.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, make without departing from the inventive concept of the premise some substituting or obvious modification, and performance or purposes identical, all should be considered as belonging to protection scope of the present invention.
Claims (6)
1. control method when square wave UPS pattern is switched, is characterized in that: comprise the following steps:
1) load capacity is divided into n group according to 0～100%, in storage n group, each organizes corresponding standard square width;
2) detect described square wave UPS and be converted to the load capacity that under the front utility mode of battery mode, output connects;
3) judge described step 2) n component class range that the load capacity that detects falls into, be made as in the scope that falls into k group;
4) square width that regulates described square wave UPS to be converted to the output voltage in first cycle after battery mode is the standard square width of described k group;
Described step 1) standard square width described in is a kind of in following two kinds of forms:
The first: described standard square width is the less square width in square width corresponding to two load capacities in each group, wherein, first load capacity is in (minimum load capacity in group, minimum load capacity * 110% in group) in scope, corresponding square width is for when described square wave UPS connects the R load of this load capacity, regulation output voltage reaches (output voltage upper specification limit * 90%, output voltage upper specification limit) square width in the time of in scope, second load capacity is in organizing interior middle load capacity ± 10% scope, corresponding square width is for when described square wave UPS connects the R load of this load capacity, square width when regulation output voltage reaches in rated voltage ± 10% scope,
The second: described standard square width is a square width that load capacity is corresponding in each group; Wherein, described load capacity is in (minimum load capacity in group, minimum load capacity * 110% in group) in scope, corresponding square width is for when described square wave UPS connects the R load of this load capacity, square width when regulation output voltage reaches in (output voltage upper specification limit * 90%, output voltage upper specification limit) scope.
2. control method when square wave UPS pattern according to claim 1 is switched, it is characterized in that: when described standard square width is the first, described first load capacity is minimum load capacity in group, corresponding square width is when described square wave UPS connects the R load of this load capacity, square width when regulation output voltage reaches output voltage upper specification limit.
3. control method when square wave UPS pattern according to claim 2 is switched, it is characterized in that: when described standard square width is the first, described second load capacity is middle load capacity in group, corresponding square width is when described square wave UPS connects the R load of this load capacity, square width when regulation output voltage reaches rated voltage.
4. control method when square wave UPS pattern according to claim 1 is switched, it is characterized in that: when described standard square width is the second, described load capacity is minimum load capacity in group, corresponding square width is when described square wave UPS connects the R load of this load capacity, square width when regulation output voltage reaches output voltage upper specification limit.
5. control method when square wave UPS pattern according to claim 1 is switched, is characterized in that: described step 2), the load that described square wave UPS output connects is APFC load.
6. a square wave UPS, is characterized in that: comprise the control device of controlling when described UPS pattern is switched, described control device comprises memory module, detection module, judge module and adjustment module;
Described memory module stores that in n group, each organizes corresponding standard square width; The n group of described n group for obtaining after load capacity is divided according to 0～100%; Described standard square width is a kind of in following two kinds of forms: the first, and described standard square width is the less square width in square width corresponding to two load capacities in each group; First load capacity is in (minimum load capacity in group, minimum load capacity * 110% in group) in scope, corresponding square width is for when described square wave UPS connects the R load of this load capacity, square width when regulation output voltage reaches in (output voltage upper specification limit * 90%, output voltage upper specification limit) scope; Second load capacity is in organizing interior middle load capacity ± 10% scope, and corresponding square width is when described square wave UPS connects the R load of this load capacity, square width when regulation output voltage reaches in rated voltage ± 10% scope; The second, described standard square width is a square width that load capacity is corresponding in each group; Wherein, described load capacity is in (minimum load capacity in group, minimum load capacity * 110% in group) in scope, corresponding square width is for when described square wave UPS connects the R load of this load capacity, square width when regulation output voltage reaches in (output voltage upper specification limit * 90%, output voltage upper specification limit) scope;
Described detection module detects described square wave UPS and is converted to the load capacity that under the front utility mode of battery mode, output connects;
The input of described judge module connects the output of described detection module, and the n component class range that judgement load capacity falls into is made as in the scope that falls into k group;
Two inputs of described adjustment module connect respectively the output of described memory module and described judge module, and the square width that regulates described square wave UPS to be converted to the output voltage in first cycle after battery mode is the standard square width of described k group.
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| CN101262133A (en) * | 2007-03-06 | 2008-09-10 | 艾默生网络能源系统有限公司 | PWM switching control method and device for three-level PFC circuit |
| CN102318177A (en) * | 2008-12-10 | 2012-01-11 | 美国电力转换公司 | Be used for the not power factor correction of interrupt power supply of non-sine |
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| US9438134B2 (en) * | 2011-03-29 | 2016-09-06 | Schneider Electric It Corporation | System and method for off-line ups |
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| US5784268A (en) * | 1996-09-20 | 1998-07-21 | General Signal Corporation | Inverter control for support of power factor corrected loads |
| CN101262133A (en) * | 2007-03-06 | 2008-09-10 | 艾默生网络能源系统有限公司 | PWM switching control method and device for three-level PFC circuit |
| CN102318177A (en) * | 2008-12-10 | 2012-01-11 | 美国电力转换公司 | Be used for the not power factor correction of interrupt power supply of non-sine |
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