CN102231541B - Method and device for numbering power modules in modular uninterruptible power supply - Google Patents
Method and device for numbering power modules in modular uninterruptible power supply Download PDFInfo
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- CN102231541B CN102231541B CN 201110171446 CN201110171446A CN102231541B CN 102231541 B CN102231541 B CN 102231541B CN 201110171446 CN201110171446 CN 201110171446 CN 201110171446 A CN201110171446 A CN 201110171446A CN 102231541 B CN102231541 B CN 102231541B
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Abstract
The invention discloses a method for numbering power modules in a modular uninterruptible power supply. The method comprises that: outputting stabilized voltages by using auxiliary power supplies in each power module respectively; regulating the stabilized voltages in each power module according to a preset voltage regulation scheme respectively, and outputting regulated voltage signals, wherein the stabilized voltage output by the auxiliary power supplies in each power module is regulated into different voltage signals by the preset voltage regulation scheme; comparing the regulated voltage signals in each power module with a reference voltage signal, and outputting corresponding pulse signals with different widths respectively; and performing self-numbering according to the widths of own corresponding pulse signals by using each power module. The embodiment of the invention also provides a corresponding numbering device and the modular interruptible power supply. By the technical scheme, the numbering of the power module can be finished only by a path of pulse signals in each power module, so the number of input pins of a microprocessor is decreased.
Description
Technical field
The present invention relates to the uninterrupted power supply technical field, be specifically related to method for numbering serial, numbering device and the Modular UPS of power model in Modular UPS.
Background technology
Uninterrupted power supply (UPS, Uninterruptible Power System) is a kind of energy storage device that contains, the power supply of the constant voltage constant frequency take inverter as chief component.Be mainly used in providing continual supply of electric power to single computer, computer network system or other power electronic equipment.When civil power input was normal, UPS was supplied to load to use after with the civil power voltage stabilizing, and the UPS of this moment is exactly an electric main pressurizer, and it also charges to self-contained battery simultaneously; Work as commercial power interruption, as: during accident interruption, with the electric energy of self-contained battery, the method for changing by inversion continues supply 220V alternating current to load to UPS, load is kept worked and protect the load soft and hardware not to be damaged immediately.
Comprise a plurality of power models at Modular UPS, because system will average power division to each power model, and each power model need to carry out communication with same host computer, host computer is the monitoring unit of uninterrupted power supply namely, so need to number separately each power model.The effect of numbering is: on the one hand system can be inquired and several power models have been installed so that average power division control in system, each power model and upper machine communication on the other hand, or when power model and the mutual communication of power model, also need the numbering of power model is used as the numbering of communication node, in order to avoid produce the communication node conflict during a plurality of module communication.
Be to adopt the binary coding mode to the modules method for numbering serial in UPS at present, will be delivered to by the signal of telecommunication that the multichannel high-low level forms a plurality of input pins of microprocessor (MCU, microprocessor control unit).MCU makes up by the high-low level that detects these pins power model is numbered, as shown in Figure 1.
The shortcoming of this prior art is that to take the input pin of MCU many, often needs outer despreading circuit to realize when the processor input pin is inadequate.If coding circuit and MCU are when different circuit boards in addition, need to connect signal cable also many.For example the power model number is 4 o'clock, and the input pin that needs at least is 2; The power model number is 6 o'clock, and the input pin that needs at least is 3.
Summary of the invention
The embodiment of the present invention provides power model method for numbering serial, numbering device and Modular UPS in a kind of Modular UPS, in the Modular UPS that the embodiment of the present invention provides, the power model method for numbering serial can guarantee to reduce the input pin of microprocessor in power model under the different condition of each power model numbering.
The method for numbering serial of power model in a kind of Modular UPS comprises:
Accessory power supply in each power model is stable output voltage respectively;
Regulate respectively described burning voltage according to default pressure regulation scheme in each power model, the voltage signal after output is regulated, described default pressure regulation scheme can be adjusted to the burning voltage that the accessory power supply in each power model is exported different voltage signals;
Voltage signal after described adjusting in each power model is compared with a reference voltage signal, and the pulse signal of the different in width of output correspondence respectively, described reference voltage signal are the regular voltage signal that changes;
Each power model carries out oneself's numbering according to the width of each self-corresponding pulse signal.
The numbering device of power model in a kind of Modular UPS all includes a described numbering device of cover in each power model in described Modular UPS, described numbering device comprises:
Accessory power supply is used for stable output voltage;
The pressure regulation unit, be used for regulating according to default pressure regulation scheme the burning voltage of described accessory power supply output, voltage signal after output is regulated, described default pressure regulation scheme can be adjusted to the burning voltage that the accessory power supply in each power model is exported different voltage signals;
Pwm unit is used for the voltage signal after described pressure regulation unit adjusting is compared with a reference voltage signal, and the pulse signal of the corresponding width of output, described reference voltage signal are the regular voltage signal that changes;
Microprocessor is used for according to the width of described pulse signal, this numbering device place power model being numbered.
A kind of Modular UPS all includes a described numbering device of cover in each power model in described Modular UPS.
the embodiment of the present invention adopts the accessory power supply difference stable output voltage in each power model, regulate respectively described burning voltage according to default pressure regulation scheme in each power model, voltage signal after output is regulated, described default pressure regulation scheme can be adjusted to the burning voltage that the accessory power supply in each power model is exported different voltage signals, voltage signal after described adjusting in each power model is compared with a reference voltage signal, the pulse signal of the different in width of output correspondence respectively, each power model carries out oneself's numbering according to the width of each self-corresponding pulse signal.the method for numbering serial of the power model that the embodiment of the present invention provides, only just can complete numbering to each power model by one tunnel pulse in each power model, voltage signal after the adjusting of each power model output is different, the numbering that just can guarantee each power model in uninterrupted power supply is different, in prior art, the signal of telecommunication that is comprised of the multichannel high-low level is delivered to a plurality of input pins of microprocessor and is compared, the embodiment of the present invention is under having guaranteed the prerequisite that in the uninterrupted power supply, the power model numbering is not identical, reduced the pin number of microprocessor in the power model.
Description of drawings
Fig. 1 is that available technology adopting binary coding mode is to the schematic diagram of power model numbering;
Fig. 2 is the first embodiment schematic diagram of power model method for numbering serial in the embodiment of the present invention;
Fig. 3 is the pulse signal schematic diagram of signal conversion module output in the embodiment of the present invention;
Fig. 4 is the first embodiment schematic diagram of numbering device in the embodiment of the present invention;
Fig. 5 is the second embodiment schematic diagram of numbering device in the embodiment of the present invention;
Fig. 6 is the embodiment schematic diagram of the numbering device that provides of application scenarios embodiment.
Embodiment
The embodiment of the present invention provides power model method for numbering serial in a kind of Modular UPS, can guarantee to reduce the input pin of microprocessor in power model under the different condition of each power model numbering.The embodiment of the present invention also provides corresponding numbering device and Modular UPS.Below be elaborated respectively.
Consult Fig. 2, in the embodiment of the present invention, the first embodiment of the method for numbering serial of power model comprises:
101, the difference of the accessory power supply in each power model stable output voltage;
Accessory power supply on each power model is identical, and the burning voltage of output is also identical.
102, regulate respectively described burning voltage according to default pressure regulation scheme in each power model, the voltage signal after output is regulated;
Described default pressure regulation scheme can be adjusted to the burning voltage that the accessory power supply in each power model is exported different voltage signals;
103, the voltage signal after the described adjusting in each power model is compared with a reference voltage signal, respectively pulse signal corresponding to output;
Described reference voltage signal is the regular voltage signal that changes, as sine wave, and triangular wave etc.;
After voltage after described adjusting and a reference voltage signal are compared, export the pulse signal of a fixed cycle, magnitude of voltage difference because of the voltage signal after the described adjusting that receives at every turn, so the high level time of every subpulse is different, be the pulse signal of identical fixed cycle because of the pulse signal of exporting in each power model again, definition according to pulse duration, pulse duration equals the ratio of high level time and fixed cycle, pulse duration is duty ratio namely, so the pulse duration of the pulse of each fixed cycle is not identical.
104, each power model carries out oneself's numbering according to the width of each self-corresponding pulse signal;
The width of the pulse signal of each power model output is unique, and namely duty ratio is all not identical, so it is not identical to be numbered the numbering that can guarantee each power model according to the width of pulse signal;
After numbering, each power model stores numbering separately, on the one hand system can be inquired and several power models have been installed so that average power division control in system, each power model and upper machine communication on the other hand, or when power model and the mutual communication of power model, also need the numbering of power model is used as the numbering of communication node, in order to avoid produce the communication node conflict during a plurality of module communication.
in the embodiment of the present invention, accessory power supply in each power model is stable output voltage respectively, regulate respectively described burning voltage according to default pressure regulation scheme in each power model, voltage signal after output is regulated, described default pressure regulation scheme can be adjusted to the burning voltage that the accessory power supply in each power model is exported different voltage signals, with the voltage signal after the described adjusting in each power model with after a reference voltage signal is compared, the pulse signal of the different in width of output correspondence respectively, each power model carries out oneself's numbering according to the width of each self-corresponding pulse signal.the method for numbering serial of the power model that the embodiment of the present invention provides, only just can complete numbering to each power model by one tunnel pulse in each power model, voltage signal after the adjusting of each power model output is different, the width that just can guarantee pulse signal is different, the final numbering difference that just can guarantee each power model in Modular UPS, in prior art, the signal of telecommunication that is comprised of the multichannel high-low level is delivered to a plurality of input pins of microprocessor and is compared, the embodiment of the present invention is under having guaranteed the prerequisite that in the uninterrupted power supply, the power model numbering is not identical, reduced the pin number of microprocessor in the power model.
alternatively, in above-mentioned the first embodiment, before step 101, can also comprise, default pressure regulation scheme in each power model, described default pressure regulation scheme is to set the different divider resistance of resistance in the regulating circuit of each power model, voltage signal after the adjusting of described output is the voltage signal at divider resistance two ends, the present embodiment is by setting the default pressure regulation scheme of the different divider resistance of resistance in the regulating circuit of each power model, realize the technical scheme of each power model numbering in uninterrupted power supply, the numbering of each power model does not need to carry out in order, the numbering that respectively self-deploys self gets final product.
alternatively, in above-mentioned the first embodiment, each power model can also be numbered successively, during number consecutively, can also comprise, the voltage signal of numbered each power model after with self-regulation sends to all unnumbered power models of back, unnumbered power model receives the voltage after each self-regulation of sending with the power model of numbering the front, described default pressure regulation scheme is specially, all have numbered the voltage signal after the adjusting that power model sends to unnumbered each power model according to the front that receives, regulate the divider resistance of regulating circuit separately, all have numbered the voltage signal after the different adjusting of voltage signal after the adjusting that power model sends from the front to make unnumbered each power model output.All have numbered the voltage signal after the adjusting that power model sends to the present embodiment according to the front that receives by each power model, regulate the default pressure regulation scheme of the divider resistance of regulating circuit separately, realize the technical scheme of each power model numbering in uninterrupted power supply, each power model is numbered successively.
Consult Fig. 3, after in each power model of the present invention, voltage signal being converted to pulse signal, the pulse signal square wave figure of output, from figure, the cycle that clearly can find out each pulse signal is identical, the time of high level is not identical, so the duty ratio of each pulse signal is different, can guarantee the numbering of power model different.
All include a cover numbering device in each power model in Modular UPS of the present invention, the numbering device of the below in any one power model is introduced as example, and the numbering device in each power model is identical.
Consult Fig. 4, in the embodiment of the present invention, the first embodiment of the numbering device of uninterrupted power supply power model comprises:
Described pressure regulation unit comprises the first resistance R 0 and adjustable resistance circuit, described the first resistance R 0 is connected with described adjustable resistance circuit, the voltage at described adjustable resistance circuit two ends is the voltage after the adjusting of output is transferred in the pressure regulation unit, regulate described adjustable resistance circuit, can make the different voltage of described pressure regulation unit output.
Described adjustable resistance circuit is slide rheostat or switching circuit;
When described adjustable resistance circuit is slide rheostat, can guarantee by regulating slide rheostat the output voltage difference of pressure regulation unit;
When described adjustable resistance circuit is switching circuit, described switching circuit comprises the resistance of a plurality of different resistances, the resistance of described a plurality of different resistances is in parallel, and each resistance is connected with a switch, and different switch closures can make the different voltage of described pressure regulation unit output;
Certainly, described switching circuit also can have the resistance of similar resistance, if closed by different switches, different the getting final product of output voltage of realizing the pressure regulation unit.
in the embodiment of numbering device of the present invention, accessory power supply 201 stable output voltages, the burning voltage of described accessory power supply output is regulated in pressure regulation unit 202 according to default pressure regulation scheme, voltage signal after output is regulated, described default pressure regulation scheme can be adjusted to the burning voltage that the accessory power supply in each power model is exported different voltage signals, after pwm unit 203 receives voltage signal after the adjusting of pressure regulation unit 202 outputs, voltage signal after regulon 202 is regulated is compared with a reference voltage signal, export the pulse signal of corresponding width, after microprocessor 204 receives pulse signal, obtain the width of pulse signal, be numbered for this numbering device place power model according to the width of pulse signal.the numbering device of the power model that the embodiment of the present invention provides, according to default pressure regulation scheme, voltage after the adjusting of the pressure regulation unit output in each power model is not identical, the width that just can guarantee pulse signal is different, the numbering that finally can guarantee each power model is not identical, only need an input pin to be connected with microprocessor in numbering device of the present invention, in prior art, the signal of telecommunication that is comprised of the multichannel high-low level is delivered to a plurality of input pins of microprocessor and is compared, the embodiment of the present invention is under having guaranteed the prerequisite that in the uninterrupted power supply, the power model numbering is not identical, reduced the pin number of microprocessor in the power model.
Consult Fig. 5, in the embodiment of the present invention, the second embodiment of the numbering device of uninterrupted power supply power model comprises:
The function of accessory power supply 302, pwm unit 305 and microprocessor 306 is identical with the first embodiment of above-mentioned numbering device, and this enforcement is no longer done in detail and given unnecessary details.
In the present embodiment, in uninterrupted power supply, the numbering device of power model also comprises:
Described pressure regulation unit 303, all have numbered voltage signal after the adjusting that power model sends also to be used for the front that receives according to described receiver 301, regulate the divider resistance of regulating circuit, all have numbered the voltage signal after the different adjusting of voltage signal after the adjusting that power model sends from the front to make this pressure regulation unit 303 outputs;
in the embodiment of the present invention, receiver 301 receives the front, and all have numbered voltage signal after the adjusting that the transmitter of power model sends, accessory power supply 302 stable output voltages, all have numbered voltage signal after the adjusting that power model sends the front that pressure regulation unit 303 receives according to receiver 301, regulate the divider resistance of regulating circuit, all have numbered the voltage signal after the different adjusting of voltage signal after the adjusting that power model sends from the front to make 303 outputs of this pressure regulation unit, transmitter 304 sends to all unnumbered power models with the voltage signal after the adjusting of pressure regulation unit 303 outputs again, voltage signal after signal conversion module 305 is regulated pressure regulation unit 303 is compared with a reference voltage signal, export the pulse signal of corresponding width, microprocessor 306 is according to the width of pulse signal, be numbered for this numbering device place power model.the numbering device of the power model that the embodiment of the present invention provides, voltage after the numbered power model in the front that receives according to receiver is regulated, self pressure regulation unit adjusts one, and all have numbered the voltage different voltage all after power model is regulated from the front, the width that just can guarantee pulse signal is different, the numbering that finally can guarantee each power model is not identical, only need an input pin to be connected with microprocessor in numbering device of the present invention, in prior art, the signal of telecommunication that is comprised of the multichannel high-low level is delivered to a plurality of input pins of microprocessor and is compared, the embodiment of the present invention is under having guaranteed the prerequisite that in the uninterrupted power supply, the power model numbering is not identical, reduced the pin number of microprocessor in the power model.
For ease of understanding, the below is elaborated take a concrete application scenarios as example.
Consult Fig. 6, application scenarios embodiment of the present invention comprises:
voltage after all power models of front that the previous power model of receiver reception sends are regulated, accessory power supply stable output voltage vcc, the first resistance R 0 in the pressure regulation unit is connected with a switching circuit, there is the resistance of a plurality of different resistances in parallel in switching circuit, each resistance is connected with a switch, by switch can control switch the break-make of place circuit, X resistance is arranged shown in figure, suppose X=3, in parallel circuits, the switch of 3 circuits all disconnects, the resistance that is equivalent to parallel circuits is infinitely great, voltage in regulating circuit all is assigned to parallel circuits two ends, voltage vcc after the adjusting of at this moment regulating circuit output.Switch closure when resistance R 1 place circuit, the switch of other two circuits all disconnects, at this moment be equivalent to the first resistance R 0 and connect with resistance R 1, the voltage at resistance R 1 two ends is R1/ (R0+R1) * Vcc, and the voltage after the adjusting of regulating circuit output is R1/ (R0+R1) * Vcc.In like manner, if the switch of R2 place circuit is closed, the switch of other two circuits disconnects, voltage after the adjusting of regulating circuit output is R2/ (R0+R2) * Vcc, if the switch of R3 place circuit is closed, the switch of other two circuits disconnects, and the voltage after the adjusting of regulating circuit output is R3/ (R0+R3) * Vcc.certainly, also have, the switch of R1 and R2 place circuit is all closed, the switch of R3 place circuit disconnects, voltage after the adjusting of at this moment regulating circuit output is (R1||R2)/(R0+ (R1||R2)) * VCC, in like manner, if the switch of R1 and R3 place circuit is all closed, the switch of R2 place circuit disconnects, voltage after the adjusting of at this moment regulating circuit output is (R1||R3)/(R0+ (R1||R3)) * VCC, the switch of R2 and R3 place circuit is all closed, the switch of R1 place circuit disconnects, voltage after the adjusting of at this moment regulating circuit output is (R2||R3)/(R0+ (R2||R3)) * VCC, work as R1, when the switch of R2 and R3 three-line is all closed, voltage after the adjusting of regulating circuit output is (R1||R2||R3)/(R0+ (R1||R2||R3)) * VCC.Voltage after the adjusting of all power models of front that the pressure regulation unit receives according to receiver, adjust one with all power models of front the Voltage-output after not identical adjusting to pwm unit, pwm unit in this application scene is comparator, comparator is converted to the voltage signal of regulating circuit output the pulse signal of corresponding width, described pulse signal is the square wave of fixed cycle, with described output of pulse signal to microprocessing unit, microprocessing unit is given described power model numbering according to the width of described pulse signal.In Modular UPS, different because of the voltage after all power models adjustings of voltage and front after each power model adjusting, so the width of each pulse signal is unique, the numbering of each power model is also mutually different.After the power model numbering, system can be inquired several power models have been installed so that average power division control in system, each power model and upper machine communication on the other hand, or when power model and the mutual communication of power model, the numbering of power model to be used as the numbering of communication node, different because of the numbering of each power model, produce the communication node conflict in the time of can avoiding a plurality of module communication.
The numbering device of power model in the uninterrupted power supply that the embodiment of the present invention provides when numbering,, is numbered to power model by identifying this road pulse signal width by one road pulse signal because of only, only needs an input pin.Compared with prior art, the embodiment of the present invention has reduced the quantity demand to the microprocessor input pin,, has reduced again simultaneously the first demand of good connecting circuit not in the situation of same circuit board for coding circuit and processor, has reduced cost.
The embodiment of the present invention also provides Modular UPS, and in Modular UPS, each power model all comprises the numbering device in above-described embodiment.
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of above-described embodiment is to come the relevant hardware of instruction complete by program, this program can be stored in a computer-readable recording medium, and storage medium can comprise: ROM, RAM, disk or CD etc.
In the above uninterrupted power supply that the embodiment of the present invention is provided in the method for numbering serial of power model and uninterrupted power supply numbering device and the Modular UPS of power model be described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. the method for numbering serial of power model in a Modular UPS, is characterized in that, comprising:
Accessory power supply in each power model is stable output voltage respectively;
Regulate respectively described burning voltage according to default pressure regulation scheme in each power model, the voltage signal after output is regulated, described default pressure regulation scheme can be adjusted to the burning voltage that the accessory power supply in each power model is exported different voltage signals;
Voltage signal after described adjusting in each power model is compared with reference voltage signal, and the pulse signal of the different in width of output correspondence respectively, described reference voltage signal are the regular voltage signal that changes;
Each power model carries out oneself's numbering according to the width of each self-corresponding pulse signal.
2. the method for numbering serial of power model in Modular UPS according to claim 1, is characterized in that, before the accessory power supply difference stable output voltage in described each power model, also comprises:
Default pressure regulation scheme in each power model, described default pressure regulation scheme are to set the different divider resistance of resistance in the regulating circuit of each power model, and the voltage signal after the adjusting of described output is the voltage signal at divider resistance two ends.
3. the method for numbering serial of power model in Modular UPS according to claim 1, is characterized in that, each power model in described Modular UPS is numbered successively, and described method for numbering serial also comprises:
The voltage signal of numbered each power model after with self-regulation sends to all unnumbered power models of back;
Described default pressure regulation scheme is specially:
All have numbered the voltage signal after the adjusting that power model sends to unnumbered each power model according to the front that receives, regulate the divider resistance of regulating circuit separately, all have numbered the voltage signal after the different adjusting of voltage signal after the adjusting that power model sends from the front to make unnumbered each power model output.
4. the method for numbering serial of power model according to claim 1～3 described Modular UPSs of any one, is characterized in that, carries out also comprising after self-step of numbering at the width of each power model according to each self-corresponding pulse signal:
Each power model storage power model numbering separately.
5. the numbering device of power model in a Modular UPS, is characterized in that, all includes a described numbering device of cover in each power model in described Modular UPS, and described numbering device comprises:
Accessory power supply is used for stable output voltage;
The pressure regulation unit, be used for regulating according to default pressure regulation scheme the burning voltage of described accessory power supply output, voltage signal after output is regulated, described default pressure regulation scheme can be adjusted to the burning voltage that the accessory power supply in each power model is exported different voltage signals;
Pwm unit is used for the voltage signal after described pressure regulation unit adjusting is compared with a reference voltage signal, and the pulse signal of the corresponding width of output, described reference voltage signal are the regular voltage signal that changes;
Microprocessor is used for according to the width of described pulse signal, this numbering device place power model being numbered.
6. the numbering device of power model in Modular UPS according to claim 5, is characterized in that, described numbering device also comprises receiver and transmitter:
Described receiver, all have numbered voltage signal after the adjusting that the transmitter of power model sends be used for to receive the front;
Described pressure regulation unit, all have numbered voltage signal after the adjusting that power model sends also to be used for the front that receives according to described receiver, regulate the divider resistance of regulating circuit, all have numbered the voltage signal after the different adjusting of voltage signal after the adjusting that power model sends from the front to make this pressure regulation unit output;
Described transmitter is used for the voltage signal after described pressure regulation unit adjusting is sent to all unnumbered power models of back.
7. the numbering device of power model according to claim 5 or 6 described Modular UPSs, it is characterized in that, described pressure regulation unit comprises the first resistance (R0) and adjustable resistance circuit, described the first resistance (R0) is connected with described adjustable resistance circuit, the voltage at described adjustable resistance circuit two ends is the voltage after the adjusting of pressure regulation unit output, regulate described adjustable resistance circuit, can make the different voltage of described pressure regulation unit output.
8. the numbering device of power model in Modular UPS according to claim 7, it is characterized in that, described adjustable resistance circuit is slide rheostat or switching circuit, when described adjustable resistance circuit is switching circuit, described switching circuit comprises the resistance of a plurality of different resistances, the resistance of described a plurality of different resistances is in parallel, and each resistance is connected with a switch, and different switch closures can make the different voltage of described pressure regulation unit output.
9. the numbering device of power model in Modular UPS according to claim 7 is characterized in that:
Described microprocessor also is used for the numbering of the power model at this numbering device of storage place.
10. a Modular UPS, is characterized in that, all includes the described numbering device of any one in a cover claim 5 to 9 in each power model in described Modular UPS.
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| CN2591840Y (en) * | 2001-12-07 | 2003-12-10 | 广东志成冠军电子实业有限公司 | Bus controlled parallel uninterruption power source |
| CN1581631A (en) * | 2003-07-30 | 2005-02-16 | 飞瑞股份有限公司 | Alternating current output parallel power supply system and its equalized current control method |
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| CN2591840Y (en) * | 2001-12-07 | 2003-12-10 | 广东志成冠军电子实业有限公司 | Bus controlled parallel uninterruption power source |
| CN1581631A (en) * | 2003-07-30 | 2005-02-16 | 飞瑞股份有限公司 | Alternating current output parallel power supply system and its equalized current control method |
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