CN103001530A - Method and device for controlling square-wave UPS (uninterrupted power supply) output voltage in battery mode - Google Patents
Method and device for controlling square-wave UPS (uninterrupted power supply) output voltage in battery mode Download PDFInfo
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- CN103001530A CN103001530A CN2012104281753A CN201210428175A CN103001530A CN 103001530 A CN103001530 A CN 103001530A CN 2012104281753 A CN2012104281753 A CN 2012104281753A CN 201210428175 A CN201210428175 A CN 201210428175A CN 103001530 A CN103001530 A CN 103001530A
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Abstract
The invention discloses a method and a device for controlling square-wave UPS (uninterrupted power supply) output voltage in a battery mode. The method includes steps of firstly, detecting peak voltage of output square waves within a current half-circle initial setting time section; and secondly, adjusting square wave width within the current residual semi-circle time section, so that the current semi-circle voltage effective value does not exceed the set output voltage. The method and the device for controlling square-wave UPS output voltage in the battery mode have the advantages that no matter for high-frequency square-wave UPS and low-frequency square-wave UPS, effective value of the output voltage cannot exceed much to cause damage to the load. In addition, for the low-frequency square-wave UPS, a low-frequency transformer is not easy to saturate, and an MOSFET (metal-oxide -semiconductor field effect transistor) on one side of primary winding of the transformer (a primary winding in the battery mode) is not easy to damage due to overcurrent.
Description
[technical field]
The present invention relates to the ups power field, relate in particular to square wave UPS output voltage control method and device under the battery mode.
[background technology]
Existing off-line type square wave ups power, (for example civil power increases suddenly when city's electrical anomaly, perhaps civil power outage), ups power is operated under the battery mode load is powered, and under this pattern, in the situation of load (especially APFC load) change (comprising wink throwing, unloading etc.), perhaps square wave UPS was transformed into initial a period of time of battery mode from utility mode in, ups power occurred damaging or the work deviant circumstance easily.
[summary of the invention]
Find that by the further investigation to above-mentioned technical problem ups power damages or abnormal reason of working is: the MOSFET among the UPS damages easily and causes UPS to damage, and the transformer among the UPS occurs easily saturated and causes UPS to quit work.Find that by further research deeper reason is: during load change, especially during the APFC load change, the crest voltage of UPS output can return to suddenly higher crest voltage (the square wave crest voltage that is less than or equal to the unloaded output of UPS), and this high crest voltage may continue one or more square-wave cycle, the width of square wave still maintains in the wider scope in this process, just can return to stable rated voltage afterwards, the effective value of output voltage is excessive and destroy MOSFET in causing so during this period of time, for high frequency square wave UPS, the effective value of output voltage suddenly increase has and may damage load, especially, for low-frequency square-wave UPS, the effective value of output voltage increases suddenly, to cause low-frequency transformer to occur saturated and work undesired, therefore, the unexpected increase of the effective value of output voltage, destruction to low-frequency square-wave UPS is especially large, its this problem especially in the urgent need to address.
In order to solve the problems of the technologies described above, the invention provides square wave UPS output voltage control method and device under the battery mode, so that UPS is not easy to occur to damage or the situation of irregular working.
Square wave UPS output voltage control method comprises the steps: under the battery mode
1) crest voltage in the initial setting time period of the current half-cycle of detection output square wave;
2) according to the size of this crest voltage, regulate the interior square width of remaining time period of current half-cycle, so that the voltage effective value of current half-cycle is no more than the setting output voltage.
In more excellent scheme, also comprise the steps:
The corresponding relation of the square wave peak voltage ranges in the initial setting time period of the many groups of setting current half-cycles and the maximum square width of current half-cycle;
If the square wave crest voltage in the initial setting time period of current half-cycle in above-mentioned certain peak voltage ranges, then makes square width be less than or equal to corresponding maximum square width within the remaining time period of current half-cycle and deducts the poor of initial setting time.
In more excellent scheme, described step 1) comprises the steps:
In time period, detect the square wave transient voltage value of the time point of setting number at the initial setting of current half-cycle, calculate the mean value of these transient voltage values as described crest voltage.
In more excellent scheme, described step 1) comprises the steps:
In time period, detect the square wave transient voltage value of the time point of setting number at the initial setting of current half-cycle;
After the transient voltage value that rejecting some and all the other transient voltage value difference value is larger in these transient voltage values, calculate the mean value of remaining transient voltage value as described crest voltage.
In more excellent scheme, described square wave UPS is low-frequency square-wave UPS.
In order to solve the problems of the technologies described above, the present invention also provides square wave UPS output voltage-operated device under the battery mode.
Square wave UPS output voltage-operated device comprises detecting unit and control unit under the battery mode, wherein,
Detecting unit is used for: the interior crest voltage of initial setting time period that detects the current half-cycle of output square wave;
Control unit is used for: the size of the crest voltage that detects according to detecting unit, regulate the square width in remaining time period of current half-cycle, so that the voltage effective value of current half-cycle is no more than the setting output voltage.
In more excellent scheme, also comprise memory cell,
Described memory cell is used for: the corresponding relation of the square wave peak voltage ranges in the initial setting time period of the many groups of storage current half-cycle and the maximum square width of current half-cycle;
If detecting unit detects crest voltage in initial setting time period of current half-cycle in above-mentioned certain peak voltage ranges, then described control unit makes square width be less than or equal to corresponding maximum square width and deducts the poor of initial setting time within the remaining time period of current half-cycle.
In more excellent scheme, described detecting unit obtains described crest voltage in the following way:
In time period, detect the square wave transient voltage value of the time point of setting number at the initial setting of current half-cycle, calculate the mean value of these transient voltage values as described crest voltage.
In more excellent scheme, in the time period, detect the square wave transient voltage value of the time point of setting number at the initial setting of current half-cycle;
After the transient voltage value that rejecting some and all the other transient voltage value difference value is larger in these transient voltage values, calculate the mean value of remaining transient voltage value as described crest voltage.
In more excellent scheme, described square wave UPS is low-frequency square-wave UPS.
The invention has the beneficial effects as follows: no matter be concerning high frequency square wave UPS or low-frequency square-wave UPS, the output voltage effective value all can be not excessive and load is damaged; For low-frequency square-wave UPS, its low-frequency transformer is not easy to occur saturated in addition, and the MOSFET of transformer (primary coil under a battery mode) side is not easy to damage because of overcurrent.
[description of drawings]
Fig. 1 is the circuit theory diagrams of typical off-line type square wave UPS;
Fig. 2 is the flow chart of square wave UPS output voltage control method under the battery mode of a kind of embodiment;
Fig. 3 is the theory diagram of square wave UPS output voltage-operated device under the battery mode of a kind of embodiment;
Fig. 4 is the oscillogram of the electric current I of the output voltage U of off-line type square wave UPS of prior art and the low-frequency transformer primary coil among the UPS (primary coil under a battery mode) side;
Fig. 5 is the oscillogram of the electric current I of the output voltage U of square wave UPS of an embodiment of the present invention and the low-frequency transformer primary coil among the UPS (primary coil under a battery mode) side;
Fig. 6 is the flow chart of square wave UPS output voltage control method under another battery mode of a kind of embodiment.
[embodiment]
Below with reference to accompanying drawing, specific embodiments of the invention are described in further detail.
Be the circuit theory diagrams of typical square wave UPS as shown in Figure 1, the two ends INV-L of its transformer and INV-N output waveform INV O/P are square waves, are carried on the two ends O/P-L and O/P-N of load, and I/P-L and I/P-N are respectively live wire end and the zero line sides of civil power.
As shown in Figure 2, square wave UPS output voltage control method under the battery mode of a kind of embodiment comprises:
Detect in initial setting time period of current half-cycle of output square wave the crest voltage of (in time period of 1/3rd such as, half period);
According to the size of this crest voltage, regulate the interior square width of remaining time period of current half-cycle, so that the voltage effective value of current half-cycle is no more than the setting output voltage.Like this, under battery mode, when the load of UPS is switched, the output voltage effective value can be not excessive, load to high frequency square wave UPS or low-frequency square-wave UPS all can not cause damage, for low-frequency square-wave UPS, can not cause its transformer to enter saturation condition in addition yet, simultaneously can be so that the electric current I of primary coil (primary coil under a battery mode) side sharply raise and make MOSFET destroyed yet.
As shown in Figure 3, the theory diagram of square wave UPS output voltage-operated device under the battery mode, comprise control unit, memory cell and detecting unit, detecting unit is used for: the interior crest voltage of initial setting time period that detects the current half-cycle of output square wave, memory cell is used for: the corresponding relation of the square wave peak voltage ranges in the initial setting time period of the many groups of storage current half-cycle and the maximum square width of current half-cycle, if detecting unit detects square wave crest voltage in initial setting time period of current half-cycle in above-mentioned certain peak voltage ranges, then described control unit makes square width be less than or equal to corresponding maximum square width and deducts the poor of initial setting time within the remaining time period of current half-cycle.
Such as Fig. 4, existing off-line type square wave UPS, the oscillogram of the electric current I (shown in the yellow waveform) of primary coil one side of its output voltage U (shown in the green waveform) and UPS transformer, with the UPS of APFC load from moment that utility mode is transformed into battery mode (wherein, waveform U1 represents the line voltage of UPS output under the battery mode, waveform U represents the square-wave voltage of UPS output), output voltage U is suddenly greater than the square wave peak value of last half cycle, crest Ua appears, cause transformer to enter saturation condition, wave distortion (not being square-wave form) also appears in its crest, electric current I also increases suddenly and crest Ia occurs, is easy to allow the MOSFET of primary coil of transformer damage.And after adopting such scheme of the present invention, as shown in Figure 5 (wherein, waveform U1 represents the line voltage of UPS output, waveform U represents the square-wave voltage of UPS output), although a crest Ub also appears suddenly in output voltage U, but owing to adopted such scheme that the width of the square wave of this half period is limited, so that the transformer of UPS does not enter saturation condition, thereby crest does not as shown in Figure 4 appear in electric current I yet, like this, the MOSFET of primary coil one side of transformer can be not damaged, reached purpose of the present invention.
As shown in Figure 6, square wave UPS output voltage control method comprises the steps: under the battery mode of a kind of embodiment
S1. set the corresponding relation of the higher limit of the square width in many prescriptions crest value voltage Vpeak scope and the half period, and be stored in the memory cell, as shown in Tables 1 and 2:
Table 1: with rated output voltage 230V, output frequency 50HZ is example, and the output voltage specification limit is: 230V+/-10%, and definition output peak voltage ranges and the corresponding interior maximum square width upper limit of half period:
Table 1
Table 2: with rated output voltage 120V, output frequency 50HZ is example, 120V ± 10%, and definition output peak voltage ranges and the corresponding interior maximum square width upper limit of half period:
Table 2
S2. under battery mode, in the time of the output square wave, detecting unit detecting square wave crest voltage, whether the number of effective points that S3. reads in the time period at the initial setting of current half period reaches to set and requires:
Initial setting in current half period is in the time period, read the crest voltage (transient voltage value) on a series of time points of square wave, judge which group crest voltage this crest voltage falls within, for example, behind the corresponding relation of having set such as table 1, in the initial 2.3ms of front half period, read 15 points, if the crest voltage of 15 points all falls between the 266V-282V, judge that then the crest voltage in this section initial setting time period falls in this peak voltage ranges; If there are 14 points to fall between the 266V-282V, 1 point exceeds this scope, and the crest voltage that also can be considered as in this section initial setting time period falls between the 266V-282V.
In addition, can also ask for the mean value of 15 crest voltages, judge again which peak voltage ranges this mean value belongs to; Can certainly judge in these 15 crest voltages, if the difference of certain crest voltage and all the other crest voltages is larger, this crest voltage of explanation not too can reflect the crest voltage of whole square wave like this, after this crest voltage should being rejected, ask again the mean value of all the other crest voltages as the crest voltage of this initial setting in the time period.
For example, if the effective output voltage specification of certain square wave UPS is 230V ± 10%, then maximum available output power is 253V, minimum effectively output voltage is 207V, when load does not change, in near the common meeting of its output voltage effective value this scope rated voltage 230V, thereby can not trigger above-mentioned protection scheme; When change appears in load; and when the peak value of output voltage increases suddenly; if do not adopt above-mentioned protection scheme that square width is limited, cause possibly voltage effective value to exceed 253V and produce destruction, therefore need to adopt corresponding safeguard measure.
According to formula
With
Namely can calculate the voltage effective value of output square wave, wherein, D is the duty ratio of square wave, and Pw is the width of square wave in the half period, and Vrms is the voltage effective value of square wave in the whole cycle, and Vpk is the square wave crest voltage.
S4. as described in the step S3, if judged when the current half-cycle phase, the interior initial setting time period, interior crest voltage belonged between the 266V-282V, and the program according to the UPS setting, the square width of whole upper half will exceed the width of limiting of square wave, then control unit is regulated the width that limits the square wave in the current half period, if making the width of interior square wave of the time period of current half-cycle phase remainder can not exceed the time of 5.5ms(initial setting time period is 2.5ms, thereby, the width of the square wave of whole current half-cycle is no more than 8ms), thus so that the output voltage effective value in this half period can not exceed the setting output voltage.
If S5. in step S3, the number of effective points that reads in the initial setting time period in the front half period can't reach requirement (can't judge namely which peak voltage ranges crest voltage falls within this time period), then, within the back to back later half cycle, according to the similar method of step S3, initial setting within the later half cycle reads the number of effective points of crest voltage again in the time period, if the number of number of effective points meets the demands, then according to the similar method of step S4, judge which peak voltage ranges the crest voltage in the initial setting time period belongs in, when belonging between the 266V-282V, then regulating the square width in the remaining time period in the after this back to back half period, is 2.5ms if make square width can not exceed 5.5ms(initial time section).Again for example, if the program that sets according to square wave UPS, the square width in the remaining time period only has 4ms, in this step, there is no need square width is defined so, because the effective value of the square wave of this half cycle can not exceed the output voltage of setting; But, if according to the program that square wave UPS sets, the square width in the remaining time period also has 6.5ms, so in this step, square width in the remaining time period should be limited in 5.5ms, otherwise the effective value of the square wave of this half cycle will exceed the output voltage of setting.
Claims (10)
1. square wave UPS output voltage control method under the battery mode is characterized in that, comprises the steps:
1) crest voltage in the initial setting time period of the current half-cycle of detection output square wave;
2) according to the size of this crest voltage, regulate the interior square width of remaining time period of current half-cycle, so that the voltage effective value of current half-cycle is no more than the setting output voltage.
2. square wave UPS output voltage control method under the battery mode as claimed in claim 1 is characterized in that, also comprises the steps:
Square wave peak voltage ranges in the initial setting time period of the many groups of setting current half-cycles and the corresponding relation of the maximum square width of current half-cycle;
If the square wave crest voltage in the initial setting time period of current half-cycle in above-mentioned certain peak voltage ranges, then makes square width be less than or equal to corresponding maximum square width within the remaining time period of current half-cycle and deducts the poor of initial setting time.
3. square wave UPS output voltage control method under the battery mode as claimed in claim 1, it is characterized in that: described step 1) comprises the steps:
In time period, detect the square wave transient voltage value of the time point of setting number at the initial setting of current half-cycle, calculate the mean value of these transient voltage values as described crest voltage.
4. square wave UPS output voltage control method under the battery mode as claimed in claim 1, it is characterized in that: described step 1) comprises the steps:
In time period, detect the square wave transient voltage value of the time point of setting number at the initial setting of current half-cycle;
After the transient voltage value that rejecting some and all the other transient voltage value difference value is larger in these transient voltage values, calculate the mean value of remaining transient voltage value as described crest voltage.
5. square wave UPS output voltage control method under the battery mode as claimed in claim 1, it is characterized in that: described square wave UPS is low-frequency square-wave UPS.
6. square wave UPS output voltage-operated device under the battery mode is characterized in that: comprise detecting unit and control unit, wherein,
Detecting unit is used for: the interior crest voltage of initial setting time period that detects the current half-cycle of output square wave;
Control unit is used for: the size of the square wave crest voltage that detects according to detecting unit, regulate the square width in remaining time period of current half-cycle, so that the voltage effective value of current half-cycle is no more than the setting output voltage.
7. square wave UPS output voltage-operated device under the battery mode as claimed in claim 6 is characterized in that: also comprise memory cell,
Described memory cell is used for: the square wave peak voltage ranges in the initial setting time period of the many groups of storage current half-cycle and the corresponding relation of the maximum square width of current half-cycle;
If detecting unit detects square wave crest voltage in initial setting time period of current half-cycle in above-mentioned certain peak voltage ranges, then described control unit makes square width be less than or equal to corresponding maximum square width and deducts the poor of initial setting time within the remaining time period of current half-cycle.
8. the square wave UPS output voltage-operated device under the battery mode as claimed in claim 6 is characterized in that described detecting unit obtains described crest voltage in the following way:
In time period, detect the square wave transient voltage value of the time point of setting number at the initial setting of current half-cycle, calculate the mean value of these transient voltage values as described crest voltage.
9. the square wave UPS output voltage-operated device under the battery mode as claimed in claim 6 is characterized in that, in the time period, detects the square wave transient voltage value of the time point of setting number at the initial setting of current half-cycle;
After the transient voltage value that rejecting some and all the other transient voltage value difference value is larger in these transient voltage values, calculate the mean value of remaining transient voltage value as described crest voltage.
10. the square wave UPS output voltage-operated device under the battery mode as claimed in claim 6, it is characterized in that: described square wave UPS is low-frequency square-wave UPS.
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Citations (5)
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| CN101097355A (en) * | 2006-06-29 | 2008-01-02 | 三星电机株式会社 | Voltage feedback circuit for liquid crystal display backlight inverter |
| US7443249B2 (en) * | 2006-02-15 | 2008-10-28 | Hynix Semiconductor Inc. | Phase locked loop for stably operating in a matter that is insensitive to variation in process, voltage and temperature and method of operating the same |
| 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 |
| US20120039098A1 (en) * | 2010-01-22 | 2012-02-16 | Power Systems Technologies, Inc. | Controller for a Power Converter and Method of Operating the Same |
| CN202395439U (en) * | 2012-01-11 | 2012-08-22 | 浙江海得新能源有限公司 | Uninterrupted power supply (UPS) over-voltage protection circuit |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7443249B2 (en) * | 2006-02-15 | 2008-10-28 | Hynix Semiconductor Inc. | Phase locked loop for stably operating in a matter that is insensitive to variation in process, voltage and temperature and method of operating the same |
| CN101097355A (en) * | 2006-06-29 | 2008-01-02 | 三星电机株式会社 | Voltage feedback circuit for liquid crystal display backlight inverter |
| 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 |
| US20120039098A1 (en) * | 2010-01-22 | 2012-02-16 | Power Systems Technologies, Inc. | Controller for a Power Converter and Method of Operating the Same |
| CN202395439U (en) * | 2012-01-11 | 2012-08-22 | 浙江海得新能源有限公司 | Uninterrupted power supply (UPS) over-voltage protection circuit |
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