CN103001530B - 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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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 ups power field, relate in particular to square wave UPS output voltage control method and device under battery mode.
[background technology]
Existing off-line type square wave ups power, in the time of city's electrical anomaly, (for example civil power increases suddenly, or civil power power-off), ups power is operated under battery mode load is powered, and under this pattern, in the situation of load (especially APFC load) variation (comprising wink throwing, unloading etc.), or be transformed into from utility mode at square wave UPS in initial a period of time of battery mode, damaging or abnormal situation of working easily appears in ups power.
[summary of the invention]
Find by the further investigation to above-mentioned technical problem, ups power damages or abnormal reason of working is: the MOSFET in UPS easily damages and causes UPS to damage, and the transformer in UPS easily occurs saturated and causes UPS to quit work.Find that by further research deeper reason is: when load change, especially when APFC load change, the crest voltage of UPS output can return to suddenly higher crest voltage (being less than or equal to the square wave crest voltage of the unloaded output of UPS), and this high crest voltage may continue one or more square-wave cycle, in this process, the width of square wave still maintains in wider scope, just can return to afterwards stable rated voltage, in causing so during this period of time, the effective value of output voltage is excessive and destroy MOSFET, for high frequency square wave UPS, the effective value of output voltage increases and has and may damage load suddenly, especially, for low-frequency square-wave UPS, the effective value of output voltage increases suddenly, to cause low-frequency transformer occur saturated and work undesired, therefore, the unexpected increase of the effective value of output voltage, especially large to the destruction of low-frequency square-wave UPS, 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 battery mode, so that UPS is not easy to occur the situation of damage or irregular working.
Under battery mode, square wave UPS output voltage control method, 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, the square width in the remaining time period of adjusting current half-cycle, so that the voltage effective value of current half-cycle is no more than 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 periods 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, 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 step 1) comprises the steps:
Within the initial setting time period of current half-cycle, detect the square wave transient voltage value of the time point of setting number, calculate the mean value of these transient voltage values as described crest voltage.
In more excellent scheme, described step 1) comprises the steps:
Within the initial setting time period of current half-cycle, detect the square wave transient voltage value of the time point of setting number;
In these transient voltage values, reject after the transient voltage value that some and all the other transient voltage value difference value is larger, 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 battery mode.
Under battery mode, square wave UPS output voltage-operated device, comprises detecting unit and control unit, wherein,
Detecting unit is used for: the crest voltage in the initial setting time period of the current half-cycle of detection output square wave;
Control unit is used for: the size of the crest voltage detecting according to detecting unit, the square width in the remaining time period of adjusting current half-cycle, so that the voltage effective value of current half-cycle is no more than 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 that crest voltage in initial setting time period of current half-cycle is in above-mentioned certain peak voltage ranges, within the remaining time period of current half-cycle, described control unit makes square width be less than or equal to corresponding maximum square width and deducts the poor of initial setting time.
In more excellent scheme, described detecting unit obtains described crest voltage in the following way:
Within the initial setting time period of current half-cycle, detect the square wave transient voltage value of the time point of setting number, calculate the mean value of these transient voltage values as described crest voltage.
In more excellent scheme, within the initial setting time period of current half-cycle, detect the square wave transient voltage value of the time point of setting number;
In these transient voltage values, reject after the transient voltage value that some and all the other transient voltage value difference value is larger, 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, 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.
[brief description of the 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 low-frequency transformer primary coil (primary coil under the battery mode) side in output voltage U and the UPS of off-line type square wave UPS of prior art;
Fig. 5 is the oscillogram of the electric current I of low-frequency transformer primary coil (primary coil under the battery mode) side in output voltage U and the UPS of square wave UPS of an embodiment of the present invention;
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, and the two ends O/P-L and the O/P-N that are carried in load are upper, 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, comprising:
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, the square width in the remaining time period of adjusting current half-cycle, so that the voltage effective value of current half-cycle is no more than setting output voltage.Like this, under battery mode, when the load of UPS is switched, 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, can not make the electric current I of primary coil (primary coil under a battery mode) side sharply raise and make MOSFET destroyed yet simultaneously.
As shown in Figure 3, the theory diagram of square wave UPS output voltage-operated device under battery mode, comprise control unit, memory cell and detecting unit, detecting unit is used for: the crest voltage in the initial setting time period of the current half-cycle of detection 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 that square wave crest voltage in initial setting time period of current half-cycle is in above-mentioned certain peak voltage ranges, within the remaining time period of current half-cycle, described control unit makes square width be less than or equal to corresponding maximum square width and deducts the poor of initial setting time.
As Fig. 4, existing off-line type square wave UPS, the oscillogram of the electric current I (shown in yellow waveform) of primary coil one side of its output voltage U (shown in green waveform) and UPS transformer, the moment that is transformed into battery mode from utility mode with the UPS of APFC load (wherein, waveform U1 represents the line voltage of UPS output under battery mode, waveform U represents the square-wave voltage of UPS output), output voltage U is greater than suddenly the square wave peak value of last half cycle, there is crest Ua, cause transformer to enter saturation condition, also there is wave distortion (not being square-wave form) in its crest, electric current I also increases suddenly and occurs crest Ia, be easy to allow the MOSFET of primary coil of transformer damage.And adopt after 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 also there is suddenly a crest Ub in output voltage U, but because the width that has adopted the square wave of such scheme to this half period limits, make the transformer of UPS not enter saturation condition, thereby there is not crest as shown in Figure 4 in electric current I yet, like this, the MOSFET of primary coil one side of transformer can be not damaged, reached object of the present invention.
As shown in Figure 6, under the battery mode of a kind of embodiment, square wave UPS output voltage control method, comprises the steps:
S1. set the corresponding relation of the higher limit of the square width in many prescriptions crest value voltage Vpeak scope and half period, and be stored in memory cell, as shown in Tables 1 and 2:
Table 1: with rated output voltage 230V, output frequency 50HZ is example, and output voltage specification limit is: 230V+/-10%, the maximum square width upper limit in definition output peak voltage ranges and corresponding half period:
Table 1
Table 2: with rated output voltage 120V, output frequency 50HZ is example, 120V ± 10%, the maximum square width upper limit in definition output peak voltage ranges and corresponding half period:
Table 2
S2. under battery mode, when output square wave, detecting unit is detected square wave crest voltage, and whether the number of effective points that S3. reads within the initial setting time period of current half period reaches to set requires:
In the initial setting time period in current half 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, after having set as the corresponding relation of table 1, in the initial 2.3ms of front half period, read 15 points, if the crest voltage of 15 points all falls between 266V-282V, judge that this section of crest voltage in the initial setting time period falls in this peak voltage ranges; If there are 14 points to fall between 266V-282V, 1 super going beyond the scope of point, also can be considered as this section of crest voltage in the initial setting time period and fall between 266V-282V.
In addition, can also ask for the mean value of 15 crest voltages, then judge 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, then ask the mean value of all the other crest voltages as the crest voltage in this initial setting time period.
For example, if the effective output voltage specification of certain square wave UPS is 230V ± 10%, maximum available output power is 253V, minimum effectively output voltage is 207V, in the time that load does not change, its output voltage effective value conventionally can be within the scope of near rated voltage 230V this, thereby can not trigger above-mentioned protection scheme; When variation appears in load; and when the peak value of output voltage increases suddenly; if do not adopt above-mentioned protection scheme to limit square width, cause possibly voltage effective value to exceed 253V and produce destruction, therefore need to adopt corresponding safeguard measure.
According to formula
with
the voltage effective value that can calculate output square wave, wherein, D is the duty ratio of square wave, and Pw is the width of square wave in half period, and Vrms is the voltage effective value of square wave in the whole cycle, and Vpk is square wave crest voltage.
S4. as described in step S3, if when judging crest voltage in the initial setting time period in the current half-cycle phase and belonging between 266V-282V, and the program of setting according to UPS, the square width of whole upper half will exceed the width of limiting of square wave, control unit regulates the width that limits the square wave in current half period, if making the width of the square wave in 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), thereby make the output voltage effective value in this half period can not exceed setting output voltage.
If S5. in step S3, the number of effective points reading in the initial setting time period in the front half period cannot reach requirement (cannot judge in this time period, which peak voltage ranges crest voltage falls within), , within the back to back later half cycle, according to the similar method of step S3, in the initial setting time period within the later half cycle, again read the number of effective points of crest voltage, if the number of number of effective points meets the demands, 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 266V-282V, regulate the square width in the remaining time period in the after this back to back half period, if making square width can not exceed 5.5ms(initial time section is 2.5ms).Again for example, if the program setting 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 to define so, because the effective value of the square wave of this half cycle can not exceed the output voltage of setting; But, if the program setting according to square wave UPS, 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 to 5.5ms, otherwise the effective value of the square wave of this half cycle will exceed the output voltage of setting.
Claims (8)
1. square wave UPS output voltage control method under 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, the square width in the remaining time period of adjusting current half-cycle, so that the voltage effective value of current half-cycle is no more than setting output voltage;
Set many group corresponding relations, wherein, corresponding relation is square wave peak voltage ranges in initial setting time period of current half-cycle and the corresponding relation of current half-cycle maximum square width;
If the square wave crest voltage in the initial setting time period of current half-cycle in certain peak voltage ranges, 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.
2. square wave UPS output voltage control method under battery mode as claimed in claim 1, is characterized in that: described step 1) comprise the steps:
Within the initial setting time period of current half-cycle, detect the square wave transient voltage value of the time point of setting number, calculate the mean value of these transient voltage values as described crest voltage.
3. square wave UPS output voltage control method under battery mode as claimed in claim 1, is characterized in that: described step 1) comprise the steps:
Within the initial setting time period of current half-cycle, detect the square wave transient voltage value of the time point of setting number;
In these transient voltage values, reject after the transient voltage value that some and all the other transient voltage value difference value is larger, calculate the mean value of remaining transient voltage value as described crest voltage.
4. square wave UPS output voltage control method under battery mode as claimed in claim 1, is characterized in that: described square wave UPS is low-frequency square-wave UPS.
5. the square wave UPS output voltage-operated device under battery mode, is characterized in that: comprise detecting unit and control unit, wherein,
Detecting unit is used for: the crest voltage in the initial setting time period of the current half-cycle of detection output square wave;
Control unit is used for: the size of the square wave crest voltage detecting according to detecting unit, and the square width in the remaining time period of adjusting current half-cycle, so that the voltage effective value of current half-cycle is no more than setting output voltage;
Also comprise memory cell,
Described memory cell is used for: the many groups of storage corresponding relations, and wherein, corresponding relation is square wave peak voltage ranges in initial setting time period of current half-cycle and the corresponding relation of current half-cycle maximum square width;
If detecting unit detects that square wave crest voltage in initial setting time period of current half-cycle is in certain peak voltage ranges, within the remaining time period of current half-cycle, described control unit makes square width be less than or equal to corresponding maximum square width and deducts the poor of initial setting time.
6. the square wave UPS output voltage-operated device under battery mode as claimed in claim 5, is characterized in that, described detecting unit obtains described crest voltage in the following way:
Within the initial setting time period of current half-cycle, detect the square wave transient voltage value of the time point of setting number, calculate the mean value of these transient voltage values as described crest voltage.
7. the square wave UPS output voltage-operated device under battery mode as claimed in claim 5, is characterized in that, within the initial setting time period of current half-cycle, detects the square wave transient voltage value of the time point of setting number;
In these transient voltage values, reject after the transient voltage value that some and all the other transient voltage value difference value is larger, calculate the mean value of remaining transient voltage value as described crest voltage.
8. the square wave UPS output voltage-operated device under battery mode as claimed in claim 5, is characterized in that: described square wave UPS is low-frequency square-wave UPS.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| 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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| US9246391B2 (en) * | 2010-01-22 | 2016-01-26 | Power Systems Technologies Ltd. | Controller for providing a corrected signal to a sensed peak current through a circuit element of a power converter |
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Patent Citations (4)
| 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 |
| 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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