CN103187787A - UPS module and UPS system - Google Patents
UPS module and UPS system Download PDFInfo
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- CN103187787A CN103187787A CN2011104439457A CN201110443945A CN103187787A CN 103187787 A CN103187787 A CN 103187787A CN 2011104439457 A CN2011104439457 A CN 2011104439457A CN 201110443945 A CN201110443945 A CN 201110443945A CN 103187787 A CN103187787 A CN 103187787A
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Abstract
The invention discloses a UPS (uninterrupted power supply) module and a UPS system. The UPS module comprises a PFC (power factor correction) rectification unit, an inversion unit and a charging unit that are connected sequentially, and a DC (direct current)/DC conversion unit, wherein when alternating-current commercial power is normal, the PFC rectification unit converts the alternating-current commercial power to direct current voltage, and charges positive and negative direct current buses; the inversion unit inverses voltage between the positive and negative direct current buses into alternating current, and supplies power for a load; the charging unit charges a battery pack; and when the alternating-current commercial power is abnormal, the DC/DC conversion unit time-shares output voltage of the battery pack through the PFC rectification unit to charge the positive and negative direct current buses. With the adoption of the technical scheme, an isolating boosting transformer is not required to be used; a space and the cost are saved; a trend of miniaturization of a switching power supply is complied with; losses are reduced; and the efficiency is improved.
Description
Technical field
The present invention relates to power electronic technology, relate in particular to a kind of UPS module and ups system.
Background technology
UPS (Uninterruptible Power Supply, uninterrupted power supply) is widely used in a plurality of industries such as electric power, telecommunications, finance, government, manufacturing, it can ensure after having a power failure and work on a period of time, make the user unlikely because power failure influences work or obliterated data, can also eliminate " power pollutions " such as surge on the civil power, instant high-voltage, moment low-voltage, electric wire noise and frequency shift (FS)s.
At present, in the ups system design of middle low power, as shown in Figure 1, this ups system comprises battery pack (two port is BAT+, BAT-) and UPS module, the UPS module comprises PFC rectification unit 100, inversion unit 200, charhing unit (not shown) and DC/DC converter unit 300, wherein, PFC rectification unit 100, inversion unit 200, charhing unit connect successively, DC/DC converter unit 300 connects charhing unit and inversion unit 200 respectively, and battery pack connects DC/DC converter unit 300 and charhing unit respectively.Should be noted that, this ups system only shows a UPS module, certainly, the quantity of the UPS module in the ups system also can be a plurality of, when being a plurality of, it is the load power supply that the output of these a plurality of UPS modules is connected in parallel, and shares this battery pack in the quantity of UPS module, that is, two inputs of the DC/DC converter unit in each UPS module connect two ports of battery pack respectively.In this ups system, when electric main just often, electric main is by after 100 rectifications of PFC rectification unit be positive and negative dc bus charging, and then by being that load is powered after inversion unit 200 inversions, simultaneously, the voltage after the inversion is this batteries charging by charhing unit; When electric main is unusual, after boosting through DC/DC converter unit 300, the output voltage of this battery pack is positive and negative dc bus charging, and then by after inversion unit 200 inversions being the load power supply.In this ups system, DC/DC converter unit 300 is designed to the isolation boosting circuit, namely adopts the output voltage of the battery pack of isolating transformer T1 among Fig. 1 to boost, and directly exports positive and negative dc bus to.The benefit of this scheme is that DC/DC converter unit 300 is kept apart and not coupling fully with PFC rectification unit 100, can improve the reliability of system.But in fact, this complete isolation scheme is not optimum selection from cost, space and standpoint of efficiency, and its major defect is:
1, DC/DC converter unit 300 adopts traditional push-pull circuit, and operating frequency is low, and loss increase, the efficient of transformer T1 are low;
2, DC/DC converter unit 300 is isolated fully with PFC rectification unit 100, there is not coupling circuit, when electric main is unusual, after the output voltage of 300 pairs of battery pack of DC/DC converter unit boosts, directly export positive and negative dc bus to, do not use PFC rectification unit 100 circuit elements fully, cost can't be accomplished optimum;
3, because the volume of the transformer T1 in the DC/DC converter unit 300 is bigger, thereby cause that taking up room of UPS module is big, cost is higher, for the ups system that comprises a plurality of UPS modules, it takes up room and more strengthens, cost is more increased, and this also disagrees with the trend toward miniaturization of Switching Power Supply.
Summary of the invention
The technical problem to be solved in the present invention is, and is big at above-mentioned UPS module cost height, the space of prior art, and ineffective defective, provides that a kind of cost is low, the space is little and the UPS module of high efficiency.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of UPS module, be used for battery pack is discharged and recharged, described UPS module comprises the PFC rectification unit that connects successively, inversion unit and charhing unit, and at electric main just often, described PFC rectification unit converts electric main to direct voltage, and be positive and negative dc bus charging, described inversion unit is reverse into alternating current with the voltage between described positive and negative dc bus, and be that load is powered, simultaneously, described charhing unit charges to battery pack, described UPS module also comprises the DC/DC converter unit, when electric main was unusual, described DC/DC converter unit was positive and negative dc bus charging with the output voltage of described battery pack by the timesharing of described PFC rectification unit.
In UPS module of the present invention, described PFC rectification unit comprises first energy storage inductor, first diode, second diode, the 4th diode, the 5th diode, first switching tube, the second switch pipe, first filter capacitor, second filter capacitor, wherein, first end of described first energy storage inductor connects an end of electric main, second end of described first energy storage inductor connects the positive pole of described first diode and the negative pole of described second diode respectively, the negative pole of described first diode connects second end of anodal and described first switching tube of described the 4th diode respectively, the positive pole of described second diode connects the negative pole of described the 5th diode and the 3rd end of described second switch pipe respectively, the 3rd end of described first switching tube is connected center line respectively with second end of described second switch pipe, the positive pole of described first filter capacitor connects the negative pole of described the 4th diode, the negative pole of described second filter capacitor connects the positive pole of described the 5th diode, and the positive pole of the negative pole of described first filter capacitor and described second filter capacitor is connected center line respectively.
In UPS module of the present invention, described PFC rectification unit comprises first energy storage inductor, first diode, second diode, first switching tube, second switch pipe, first filter capacitor, second filter capacitor, and first switching tube self has or first fly-wheel diode of external reverse parallel connection with it, and the second switch pipe self has or second fly-wheel diode of external reverse parallel connection with it; Wherein, first end of described first energy storage inductor connects an end of electric main, second end of described first energy storage inductor connects the positive pole of described first diode and the negative pole of described second diode respectively, the negative pole of described first diode connects the positive pole of described first filter capacitor, the positive pole of described second diode connects the negative pole of described second filter capacitor, the positive pole of the negative pole of described first filter capacitor and described second filter capacitor connects center line respectively, second end of described first switching tube connects the positive pole of described first diode, second end of described second switch pipe connects center line, and the 3rd end of described first switching tube is connected with the 3rd end of described second switch pipe.
In UPS module of the present invention, described DC/DC converter unit comprises the 5th switching tube, the 3rd diode, wherein, second end of described the 5th switching tube connects the positive pole of described battery pack, the 3rd end of described the 5th switching tube connects first end of described first energy storage inductor, the negative pole of described battery pack connects center line, and the positive pole of described the 3rd diode connects the positive pole of described second diode, and the negative pole of described the 3rd diode connects the 3rd end of described the 5th switching tube.
In UPS module of the present invention, described UPS module also comprises first switch and second switch, wherein, described first switch is connected between first end of electric main and described first energy storage inductor, and described second switch is connected between first end of the 3rd end of described the 5th switching tube and described first energy storage inductor.
In UPS module of the present invention, described first switch and second switch are respectively relay switch.
In UPS module of the present invention, described inversion unit is two level inverter circuits, I type tri-level inversion circuit or T type tri-level inversion circuit.
In UPS module of the present invention, described two level inverter circuits comprise the 3rd switching tube, the 4th switching tube, second energy storage inductor, the 3rd filter capacitor; Wherein, the 3rd switching tube self has or the 3rd fly-wheel diode of external reverse parallel connection with it, and the 4th switching tube self has or the 4th fly-wheel diode of external reverse parallel connection with it; Second end of described the 3rd switching tube connects the positive pole of described first filter capacitor, the 3rd end of described the 4th switching tube connects the negative pole of described second filter capacitor, the 3rd end of described the 3rd switching tube and second end of described the 4th switching tube are connected first end of described second energy storage inductor respectively, second end of described second energy storage inductor is the output of described UPS module, the positive pole of described the 3rd filter capacitor connects second end of described second energy storage inductor, and the negative pole of described the 3rd filter capacitor connects center line.
In UPS module of the present invention, described I type tri-level inversion circuit comprises the 3rd switching tube, the 4th switching tube, the 6th switching tube, the 7th switching tube, second energy storage inductor, the 3rd filter capacitor, the 6th diode and the 7th diode, wherein, second end of described the 3rd switching tube connects the positive pole of described first filter capacitor, the 3rd end of described the 3rd switching tube connects second end of described the 6th switching tube, the 3rd end of described the 6th switching tube connects second end of described the 7th switching tube, the 3rd end of described the 7th switching tube connects second end of described the 4th switching tube, the 3rd end of described the 4th switching tube connects the negative pole of described second filter capacitor, the negative pole of described the 6th diode connects the 3rd end of described the 3rd switching tube, the positive pole of described the 7th diode connects the 3rd end of described the 7th switching tube, the negative pole of the positive pole of described the 6th diode and described the 7th diode connects center line in the lump, first end of described second energy storage inductor connects the 3rd end of described the 6th switching tube, second end of described second energy storage inductor is the output of described UPS module, the positive pole of described the 3rd filter capacitor connects second end of described second energy storage inductor, and the negative pole of described the 3rd filter capacitor connects center line.
In UPS module of the present invention, described T type tri-level inversion circuit comprises the 3rd switching tube, the 4th switching tube, the 6th switching tube, the 7th switching tube, second energy storage inductor, the 3rd filter capacitor, and the 6th switching tube self has or the 6th fly-wheel diode of external reverse parallel connection with it, and the 7th switching tube self has or the 7th fly-wheel diode of external reverse parallel connection with it; Wherein, second end of described the 6th switching tube connects center line, the 3rd end of described the 6th switching tube connects the 3rd end of described the 7th switching tube, second end of described the 7th switching tube connects the 3rd end of described the 3rd switching tube respectively, second end of described the 4th switching tube and first end of described second energy storage inductor, second end of described the 3rd switching tube connects the positive pole of described first filter capacitor, the 3rd end of described the 4th switching tube connects the negative pole of described second filter capacitor, second end of described second energy storage inductor is the output of described UPS module, the positive pole of described the 3rd filter capacitor connects second end of described second energy storage inductor, and the negative pole of described the 3rd filter capacitor connects center line.
The present invention also constructs a kind of ups system, comprises at least two UPS modules that battery pack and UPS module or output are in parallel, and described UPS module is above-described UPS module.
Implement technical scheme of the present invention; when electric main is normal or unusual; the PFC rectification unit shares; therefore the PFC rectification unit has coupling circuit with the DC/DC converter unit, also is non-isolation, and this just makes battery-powered circuit DC/DC converter unit need not to adopt the isolation boosting transformer when designing; space and cost have been saved; comply with the trend of Switching Power Supply miniaturization, and reduced loss, improved efficient.In addition, DC/DC converter unit and PFC rectification unit utilize partial PFC rectification unit device because coupling circuit is arranged, and provide cost savings, and have improved efficient.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the circuit diagram of a kind of ups system of prior art;
Fig. 2 is the building-block of logic of ups system embodiment one of the present invention;
Fig. 3 is the circuit diagram of ups system embodiment two of the present invention;
Fig. 4 is the circuit diagram of ups system embodiment three of the present invention;
Fig. 5 is the circuit diagram of ups system embodiment four of the present invention;
Fig. 6 is the circuit diagram of ups system embodiment five of the present invention.
Embodiment
As shown in Figure 2, the building-block of logic of ups system embodiment one of the present invention, this ups system comprises UPS module and battery pack BAT, wherein, the UPS module comprises PFC rectification unit 100, inversion unit 200, DC/DC converter unit 300 and charhing unit 400, wherein, PFC rectification unit 100, inversion unit 200, charhing unit 400 and battery pack BAT are connected successively, and DC/DC converter unit 300 connects battery pack BAT and PFC rectification unit 100 respectively.
When electric main just often, electric main obtains direct voltage by 100 rectifications of PFC rectification unit, and is the charging of positive and negative dc bus, inversion unit 200 is alternating voltage with this direct voltage inversion then, to power to the load, simultaneously, 400 couples of battery pack BAT of charhing unit charge.When electric main is unusual, DC/DC converter unit 300 is positive and negative dc bus charging with the output voltage of battery pack BAT by 100 timesharing of PFC rectification unit, for example, if this UPS module output is the sinusoidal ac of 50Hz, also, its cycle is 20ms, then at this moment, in one-period, the time of charging for the positive direct-current bus should be 10ms, and the time of charging for negative dc bus should be 10ms.Implement this technical scheme, PFC rectification unit 100 is all in running order when electric main is normal and unusual, also be, PFC rectification unit 100 has coupling circuit with DC/DC converter unit 300, therefore PFC rectification unit 100 and DC/DC converter unit 300 are non-isolation, this just makes this UPS module when this battery pack being charged and discharge, need not to adopt the isolation boosting transformer, space and cost have been saved, complied with the trend of Switching Power Supply miniaturization, and reduced loss, improved efficient.
Fig. 3 is the circuit diagram of ups system embodiment two of the present invention, and this ups system comprises UPS module and battery pack (two port is BAT+, BAT-).In this embodiment, the UPS module comprises that first switch S 1, second switch S2, PFC rectification unit 100, inversion unit 200, DC/DC converter unit 300 and charhing unit are (not shown, it is connected and connects between battery pack and the inversion unit), each part is described respectively below:
1, the PFC rectification unit 100
This PFC rectification unit 100 comprises the first energy storage inductor L1, the first diode D1, the second diode D2, the 4th diode D4, the 5th diode D5, the first switching tube Q1, second switch pipe Q2, the first filter capacitor C1, the second filter capacitor C2.This explanation be, all mentioned switching tubes of the present invention all can be selected IGBT pipe for use, for example, the first switching tube Q1 in the present embodiment, second switch pipe Q2 all select the IGBT pipe for use.Certainly, in other embodiments, also may select the switching device of metal-oxide-semiconductor or other type for use.When switching tube is selected the IGBT pipe for use, second end of switching tube is its collector electrode, the 3rd end of switching tube is its emitter, first end of switching tube is its gate-drive utmost point, and the gate-drive utmost point connects the control circuit (not shown), and described control circuit is used for break-make frequency and the make-and-break time of each switching tube of control.When switching tube is selected metal-oxide-semiconductor for use, second end of switching tube is its drain electrode, and the 3rd end of switching tube is its source electrode, and first end of switching tube is its grid, and grid connects the control circuit (not shown), and described control circuit is used for break-make frequency and the make-and-break time of each switching tube of control.The first switching tube Q1 can select the switching tube that carries first fly-wheel diode for use, and this first fly-wheel diode and the first switching tube Q1 reverse parallel connection, similarly, second switch pipe Q2 can select the switching tube that carries second fly-wheel diode for use, and this second fly-wheel diode and second switch pipe Q2 reverse parallel connection.Certainly, the first switching tube Q1, second switch pipe Q2 also can select the switching tube that does not carry fly-wheel diode for use.In this PFC rectification unit 100, first end of the first energy storage inductor L1 connects an end (LINE) of electric main by first switch S 1, second end of the first energy storage inductor L1 connects the positive pole of the first diode D1 and the negative pole of the second diode D2 respectively, the negative pole of the first diode D1 connects second end of the anodal and first switching tube Q1 of the 4th diode D4 respectively, the positive pole of the second diode D2 connects the negative pole of the 5th diode D5 and the 3rd end of second switch pipe Q2 respectively, second end of the 3rd end of the first switching tube Q1 and second switch pipe Q2 is connected center line (NEUTUAL) respectively, the positive pole of the first filter capacitor C1 connects the negative pole of the 4th diode D4, the negative pole of the second filter capacitor C2 connects the positive pole of the 5th diode D5, and the positive pole of the negative pole of the first filter capacitor C1 and the second filter capacitor C2 is connected center line (NEUTUAL) respectively;
2, inversion unit 200
This inversion unit 200 can be selected two level inverter circuits for use, and at this moment, this inversion unit 200 comprises the 3rd switching tube Q3, the 4th switching tube Q4, the second energy storage inductor L2, the 3rd filter capacitor C3.Wherein, the 3rd switching tube Q3 self has or the 3rd fly-wheel diode of external reverse parallel connection with it, and the 4th switching tube Q4 self has or the 4th fly-wheel diode of external reverse parallel connection with it.That is to say that the 3rd switching tube Q3 can select the switching tube that carries the 3rd fly-wheel diode for use, and the 3rd fly-wheel diode and the 3rd switching tube Q3 reverse parallel connection; Similarly, the 4th switching tube Q4 can select the switching tube that carries the 4th fly-wheel diode for use, and the 4th fly-wheel diode and the 4th switching tube Q4 reverse parallel connection.Yet, as the 3rd switching tube Q3, when the 4th switching tube Q4 selects the switching tube of not being with fly-wheel diode for use, need with the 3rd fly-wheel diode of the 3rd switching tube Q3 reverse parallel connection, with the 4th fly-wheel diode of the 4th switching tube Q4 reverse parallel connection.In this embodiment, the 3rd switching tube Q3, the 4th switching tube Q4 all select the IGBT pipe for use.Certainly, in other embodiments, also may select the switching device of metal-oxide-semiconductor or other type for use.When switching tube is selected the IGBT pipe for use, second end of switching tube is its collector electrode, the 3rd end of switching tube is its emitter, first end of switching tube is its gate-drive utmost point, and the gate-drive utmost point connects the control circuit (not shown), and described control circuit is used for break-make frequency and the make-and-break time of each switching tube of control.When switching tube is selected metal-oxide-semiconductor for use, second end of switching tube is its drain electrode, and the 3rd end of switching tube is its source electrode, and first end of switching tube is its grid, and grid connects the control circuit (not shown), and described control circuit is used for break-make frequency and the make-and-break time of each switching tube of control.In this inversion unit 200, second end of the 3rd switching tube Q3 connects the positive pole of the first filter capacitor C1, the 3rd end of the 4th switching tube Q4 connects the negative pole of the second filter capacitor C2, the 3rd end of the 3rd switching tube Q3 and second end of the 4th switching tube Q4 are connected first end of the second energy storage inductor L2 respectively, second end of the second energy storage inductor L2 is the output (OUT_LINE) of described UPS module, the positive pole of the 3rd filter capacitor C3 connects second end of the second energy storage inductor L2, and the negative pole of the 3rd filter capacitor C3 connects center line (NEUTUAL);
3, the DC/DC converter unit 300
This DC/DC converter unit 300 comprises the 5th switching tube Q5 and the 3rd diode D3.In this embodiment, the 5th switching tube Q5 selects the IGBT pipe for use.Certainly, in other embodiments, also may select the switching device of metal-oxide-semiconductor or other type for use.When switching tube is selected the IGBT pipe for use, second end of switching tube is its collector electrode, the 3rd end of switching tube is its emitter, first end of switching tube is its gate-drive utmost point, and the gate-drive utmost point connects the control circuit (not shown), and described control circuit is used for break-make frequency and the make-and-break time of each switching tube of control.When switching tube is selected metal-oxide-semiconductor for use, second end of switching tube is its drain electrode, and the 3rd end of switching tube is its source electrode, and first end of switching tube is its grid, and grid connects the control circuit (not shown), and described control circuit is used for break-make frequency and the make-and-break time of each switching tube of control.Should be noted that also that at this 5th switching tube Q5 can select the switching tube that carries the 5th fly-wheel diode for use, and the 5th fly-wheel diode and the 5th switching tube Q5 reverse parallel connection, the 5th switching tube Q5 also can select the switching tube that does not carry fly-wheel diode for use.In this DC/DC converter unit 300, second end of the 5th switching tube Q5 connects the positive pole of battery pack, the 3rd end of the 5th switching tube Q5 connects first end of the first energy storage inductor L1 by second switch S2, the negative pole of battery pack connects center line (NEUTUAL), the positive pole of the 3rd diode D3 connects the positive pole of the second diode D2, and the negative pole of the 3rd diode D3 connects the 3rd end of the 5th switching tube Q5.
The following describes the operation principle of this UPS module: when electric main just often, this moment closed first switch S 1, disconnect second switch S2, electric main is the load power supply after by rectification, inversion, be specially: in commutation phase, (1) during the positive half cycle of electric main, when the first switching tube Q1 opened, electric main was the first energy storage inductor L1 energy storage by first switch S 1, the first diode D1, the first switching tube Q1; (2) the positive half cycle of electric main, when the first switching tube Q1 turn-offed, electric main was first filter capacitor C1 charging by first switch S 1, the first energy storage inductor L1, the first diode D1, the 4th diode D4; (3) negative half period of electric main, when second switch pipe Q2 opened, electric main was the first energy storage inductor L1 energy storage by second switch pipe Q2, the second diode D2, first switch S 1; (4) negative half period of electric main, when second switch pipe Q2 turn-offed, electric main was second filter capacitor C2 charging by the 5th diode D5, the second diode D2, the first energy storage inductor L1, first switch S 1.In the inversion stage, the positive half cycle of (1) output AC electricity, when the 3rd switching tube Q3 opened, the first filter capacitor C1 was the second energy storage inductor L2 energy storage by the 3rd switching tube Q3, the 3rd filter capacitor C3; (2) the positive half cycle of output AC electricity, when the 3rd switching tube Q3 turn-offed, the second energy storage inductor L2 passed through, the 3rd filter capacitor C3, the second filter capacitor C2 reach and the 4th fly-wheel diode afterflow of the 4th switching tube Q4 reverse parallel connection; (3) negative half period of output AC electricity, when the 4th switching tube Q4 opened, the second filter capacitor C2 was the second energy storage inductor L2 energy storage by the 4th switching tube Q4, the 3rd filter capacitor C3; When (4) negative half period of output AC electricity, the 4th switching tube Q4 turn-off, the second energy storage inductor L2 by with the 3rd fly-wheel diode, the first filter capacitor C1, the 3rd filter capacitor C3 afterflow of the 3rd switching tube Q3 reverse parallel connection.When electric main is unusual, disconnect first switch S 1 this moment, closed second switch S2, by battery pack through boosting, be the load power supply after the inversion, should be noted that, (electric main just often) was the same in the course of work in inversion stage when (when electric main is unusual) powered with electric main when battery-powered, do not do at this and to give unnecessary details, the course of work in commutation phase below only is described when battery-powered: (1) the 5th switching tube Q5 keeps long logical, when the first switching tube Q1 opened, the direct current of battery pack output was by the 5th switching tube Q5, second switch S2, the first diode D1, the first switching tube Q1 is the first energy storage inductor L1 energy storage; It is long logical that (2) the 5th switching tube Q5 keep, and when the first switching tube Q1 turn-offed, the direct current of battery pack output was given the first filter capacitor C1 charging by the 5th switching tube Q5, second switch S2, the first energy storage inductor L1, the first diode D1, the 4th diode D4; It is long logical that (3) first switching tube Q1 keep, and when the 5th switching tube Q5 opened, the direct current of battery pack output was the first energy storage inductor L1 energy storage by the 5th switching tube Q5, second switch S2, the first diode D1, the first switching tube Q1; It is long logical that (4) first switching tube Q1 keep, and when the 5th switching tube Q5 turn-offed, the first energy storage inductor L1 was second filter capacitor C2 charging by the first diode D1, the first switching tube Q1, the 5th diode D5, the 3rd diode D3, second switch S2.
Fig. 4 is the circuit diagram of ups system embodiment three of the present invention, and this ups system comprises UPS module and battery pack (two port is BAT+, BAT-).In this embodiment, the UPS module comprises first switch S 1, second switch S2, PFC rectification unit 100, inversion unit 200, DC/DC converter unit 300 and charhing unit (not shown, it is connected and connects between battery pack and the inversion unit).Embodiment three and the difference of embodiment two are that the circuit structure of the PFC rectification unit 100 that adopts is different.The following describes the circuit structure of PFC rectification unit 100 among the embodiment three.
In embodiment three, this PFC rectification unit 100 adopts the non-bridge PFC rectification unit, and physical circuit is as follows: this PFC rectification unit 100 comprises the first energy storage inductor L1, the first diode D1, the second diode D2, the first switching tube Q1, second switch pipe Q2, the first filter capacitor C1, the second filter capacitor C2.Wherein, the first switching tube Q1 self has or first fly-wheel diode of external reverse parallel connection with it, and second switch pipe Q2 self has or second fly-wheel diode of external reverse parallel connection with it.That is to say that the first switching tube Q1 can select the switching tube that carries first fly-wheel diode for use, and this first fly-wheel diode and the first switching tube Q1 reverse parallel connection; Similarly, second switch pipe Q2 can select the switching tube that carries second fly-wheel diode for use, and this second fly-wheel diode and second switch pipe Q2 reverse parallel connection.Yet, as the first switching tube Q1, when second switch pipe Q2 selects the switching tube of not being with fly-wheel diode for use, need with first fly-wheel diode of the first switching tube Q1 reverse parallel connection, with second fly-wheel diode of second switch pipe Q2 reverse parallel connection.The first switching tube Q1, second switch pipe Q2 can select the IGBT pipe respectively for use.Certainly, in other embodiments, also may select the switching device of metal-oxide-semiconductor or other type for use.When switching tube is selected the IGBT pipe for use, second end of switching tube is its collector electrode, the 3rd end of switching tube is its emitter, first end of switching tube is its gate-drive utmost point, and the gate-drive utmost point connects the control circuit (not shown), and described control circuit is used for break-make frequency and the make-and-break time of each switching tube of control.When switching tube is selected metal-oxide-semiconductor for use, second end of switching tube is its drain electrode, and the 3rd end of switching tube is its source electrode, and first end of switching tube is its grid, and grid connects the control circuit (not shown), and described control circuit is used for break-make frequency and the make-and-break time of each switching tube of control.First end of the first energy storage inductor L1 connects an end (LINE) of electric main by first switch S 1, second end of the first energy storage inductor L1 connects the positive pole of the first diode D1 and the negative pole of the second diode D2 respectively, the negative pole of the first diode D1 connects the positive pole of the first filter capacitor C1, the positive pole of the second diode D2 connects the negative pole of the second filter capacitor C2, the positive pole of the negative pole of the first filter capacitor C1 and the second filter capacitor C2 connects center line (NEUTUAL) respectively, second end of the first switching tube Q1 connects the positive pole of the first diode D1, second end of second switch pipe Q2 connects center line (NEUTUAL), and the 3rd end of the first switching tube Q1 is connected with the 3rd end of second switch pipe Q2.
The following describes the operation principle of the UPS module of this embodiment: at first explanation is, because inversion unit 200 is identical with the circuit structure of the inversion unit of embodiment shown in Figure 3, its operation principle also is identical, do not do at this and to give unnecessary details, below only illustrate in the electric main power supply in commutation phase and battery-powered operation principle at boost phase.
At electric main just often, closed first switch S 1, disconnect second switch S2, in commutation phase, (1) the positive half cycle of electric main, when the first switching tube Q1 opens, electric main by first switch S 1, the first switching tube Q1, with second fly-wheel diode of second switch pipe Q2 reverse parallel connection be the first energy storage inductor L1 energy storage; (2) the positive half cycle of electric main, when the first switching tube Q1 turn-offed, electric main was first filter capacitor C1 charging by first switch S 1, the first energy storage inductor L1, the first diode D1; (3) negative half period of electric main, when second switch pipe Q2 opens, electric main by second switch pipe Q2, with first fly-wheel diode, first switch S 1 of the first switching tube Q1 reverse parallel connection be the first energy storage inductor L1 energy storage; (4) negative half period of electric main, when second switch pipe Q2 turn-offed, electric main was second filter capacitor C2 charging by the second diode D2, the first energy storage inductor L1, first switch S 1.
When battery pack is boosted power supply, disconnect first switch S 1, closed second switch S2, it is long logical that (1) the 5th switching tube Q5 keeps, when the first switching tube Q1 opens, the direct current of battery pack output by the 5th switching tube Q5, second switch S2, the first switching tube Q1, with second fly-wheel diode of second switch pipe Q2 reverse parallel connection be the first energy storage inductor L1 energy storage; It is long logical that (2) the 5th switching tube Q5 keep, and when the first switching tube Q1 turn-offed, the direct current of battery pack output was given the first filter capacitor C1 charging by the 5th switching tube Q5, second switch S2, the first energy storage inductor L1, the first diode D1; It is long logical that (3) first switching tube Q1 keep, when the 5th switching tube Q5 opens, the direct current of battery pack output by the 5th switching tube Q5, second switch S2, the first switching tube Q1, with second fly-wheel diode of second switch pipe Q2 reverse parallel connection be the first energy storage inductor L1 energy storage; It is long logical that (4) first switching tube Q1 keep, when the 5th switching tube Q5 turn-offs, the first energy storage inductor L1 by the first switching tube Q1, with second fly-wheel diode, the 3rd diode D3, the second switch S2 of second switch pipe Q2 reverse parallel connection be second filter capacitor C2 charging.
Fig. 5 is the circuit diagram of ups system embodiment four of the present invention, and this ups system comprises UPS module and battery pack (two port is BAT+, BAT-).In this embodiment, the UPS module comprises first switch S 1, second switch S2, PFC rectification unit 100, inversion unit 200, DC/DC converter unit 300 and charhing unit (not shown, it is connected and connects between battery pack and the inversion unit).Embodiment four and the difference of embodiment two are that the circuit structure of the inversion unit 200 that adopts is different.The following describes the circuit structure of inversion unit 200 among the embodiment four.
In embodiment four, this inversion unit 200 is selected I type tri-level inversion circuit for use, at this moment, this inversion unit 200 comprises the 3rd switching tube Q3, the 4th switching tube Q4, the 6th switching tube Q6, the 7th switching tube Q7, the second energy storage inductor L2, the 3rd filter capacitor C3, the 6th diode D6 and the 7th diode D7.In this embodiment, the 3rd switching tube Q3, the 4th switching tube Q4, the 6th switching tube Q6, the 7th switching tube Q7 all select the IGBT pipe for use.Certainly, in other embodiments, also may select the switching device of metal-oxide-semiconductor or other type for use.When switching tube is selected the IGBT pipe for use, second end of switching tube is its collector electrode, the 3rd end of switching tube is its emitter, first end of switching tube is its gate-drive utmost point, and the gate-drive utmost point connects the control circuit (not shown), and described control circuit is used for break-make frequency and the make-and-break time of each switching tube of control.When switching tube is selected metal-oxide-semiconductor for use, second end of switching tube is its drain electrode, and the 3rd end of switching tube is its source electrode, and first end of switching tube is its grid, and grid connects the control circuit (not shown), and described control circuit is used for break-make frequency and the make-and-break time of each switching tube of control.Should be noted that also that at this 3rd switching tube Q3 can select the switching tube that carries the 3rd fly-wheel diode for use, and the 3rd fly-wheel diode and the 3rd switching tube Q3 reverse parallel connection, the 3rd switching tube Q3 also can select the switching tube that does not carry fly-wheel diode for use.The 4th switching tube Q4 can select the switching tube that carries the 4th fly-wheel diode for use, and the 4th fly-wheel diode and the 4th switching tube Q4 reverse parallel connection, and the 4th switching tube Q4 also can select the switching tube that does not carry fly-wheel diode for use.The 6th switching tube Q6 can select the switching tube that carries the 6th fly-wheel diode for use, and the 6th fly-wheel diode and the 6th switching tube Q6 reverse parallel connection, and the 6th switching tube Q6 also can select the switching tube that does not carry fly-wheel diode for use.The 7th switching tube Q7 can select the switching tube that carries the 7th fly-wheel diode for use, and the 7th fly-wheel diode and the 7th switching tube Q7 reverse parallel connection, and the 7th switching tube Q7 also can select the switching tube that does not carry fly-wheel diode for use.In this inversion unit 200, second end of the 3rd switching tube Q3 connects the positive pole of the first filter capacitor C1, the 3rd end of the 3rd switching tube Q3 connects second end of the 6th switching tube Q6, the 3rd end of the 6th switching tube Q6 connects second end of the 7th switching tube Q7, the 3rd end of the 7th switching tube Q7 connects second end of the 4th switching tube Q4, the 3rd end of the 4th switching tube Q4 connects the negative pole of the second filter capacitor C2, the negative pole of the 6th diode D6 connects the 3rd end of the 3rd switching tube Q3, the positive pole of the 7th diode D7 connects the 3rd end of the 7th switching tube Q7, the negative pole of the positive pole of the 6th diode D6 and the 7th diode D7 connects center line (NEUTUAL) in the lump, first end of the second energy storage inductor L2 connects the 3rd end of the 6th switching tube Q6, second end of the second energy storage inductor L2 is the output of UPS module, the positive pole of the 3rd filter capacitor C3 connects second end of the second energy storage inductor L2, and the negative pole of the 3rd filter capacitor C3 connects center line (NEUTUAL).
The following describes the operation principle of the UPS module of this embodiment: at first explanation is, because PFC rectification unit 100, DC/DC converter unit 300 circuit structure with the PFC rectification unit 100 of embodiment two shown in Figure 3, DC/DC converter unit 300 respectively are identical, its operation principle also is identical, do not do at this and to give unnecessary details, below operation principle in the inversion stage only is described.At first explanation is, in this inversion unit 200, and the complementary break-make of the 3rd switching tube Q3 and the 7th switching tube Q7, the complementary break-make of the 4th switching tube Q4 and the 6th switching tube Q6.In the inversion stage, (1) the positive half cycle of output AC electricity, the 6th switching tube Q6 keeps normal open, it is normally closed that the 4th switching tube Q4 keeps, the 3rd switching tube Q3 is open-minded, when the 7th switching tube Q7 turn-offed, the first filter capacitor C1 gave the second energy storage inductor L2 energy storage by the 3rd switching tube Q3, the 6th switching tube Q6, the 3rd filter capacitor C3; (2) the positive half cycle of output AC electricity, the 6th switching tube Q6 keeps normal open, and it is normally closed that the 4th switching tube Q4 keeps, and the 3rd switching tube Q3 turn-offs, when the 7th switching tube Q7 opened, the second energy storage inductor L2 was by the 3rd filter capacitor C3, the 6th diode D6, the 6th switching tube Q6 afterflow; (3) negative half period of output AC electricity, the 7th switching tube Q7 keeps normal open, it is normally closed that the 3rd switching tube Q3 keeps, the 4th switching tube Q4 opens, when the 6th switching tube Q6 turn-offs, the second filter capacitor C2 gives the second energy storage inductor L2 energy storage by the 3rd filter capacitor C3, the 7th switching tube Q7, the 4th switching tube Q4; (4) negative half period of output AC electricity, the 7th switching tube Q7 keeps normal open, it is normally closed that the 3rd switching tube Q3 keeps, and the 4th switching tube Q4 turn-offs, when the 6th switching tube Q6 opens, and the second energy storage inductor L2 is by the 7th switching tube Q7, the 7th diode D7, the 3rd filter capacitor C3 afterflow.
Fig. 6 is the circuit diagram of ups system embodiment five of the present invention, and this ups system comprises UPS module and battery pack (two port is BAT+, BAT-).In this embodiment, the UPS module comprises first switch S 1, second switch S2, PFC rectification unit 100, inversion unit 200, DC/DC converter unit 300 and charhing unit (not shown, it is connected and connects between battery pack and the inversion unit).Embodiment five and the difference of embodiment two are that the circuit structure of the inversion unit 200 that adopts is different.The following describes the circuit structure of inversion unit 200 among the embodiment five.
In embodiment five, this inversion unit 200 is selected T type tri-level inversion circuit for use, and at this moment, this inversion unit 200 comprises the 3rd switching tube Q3, the 4th switching tube Q4, the 6th switching tube Q6, the 7th switching tube Q7, the second energy storage inductor L2, the 3rd filter capacitor C3.Wherein, the 6th switching tube Q6 self has or the 6th fly-wheel diode of external reverse parallel connection with it, the 7th switching tube Q7 self has or the 7th fly-wheel diode of external reverse parallel connection with it, that is to say, the 6th switching tube Q6 can select the switching tube that carries the 6th fly-wheel diode for use, and the 6th fly-wheel diode and the 6th switching tube Q6 reverse parallel connection; Similarly, the 7th switching tube Q7 can select the switching tube that carries the 7th fly-wheel diode for use, and the 7th fly-wheel diode and the 7th switching tube Q7 reverse parallel connection.Yet, as the 6th switching tube Q6, when the 7th switching tube Q7 selects the switching tube of not being with fly-wheel diode for use, need with the 6th fly-wheel diode of the 6th switching tube Q6 reverse parallel connection, with the 7th fly-wheel diode of the 7th switching tube Q7 reverse parallel connection.In addition, the 3rd switching tube Q3 can select the switching tube that carries the 3rd fly-wheel diode for use, and the 3rd fly-wheel diode and the 3rd switching tube Q3 reverse parallel connection, and the 3rd switching tube Q3 also can select the switching tube that does not carry fly-wheel diode for use.The 4th switching tube Q4 can select the switching tube that carries the 4th fly-wheel diode for use, and the 4th fly-wheel diode and the 4th switching tube Q4 reverse parallel connection, and the 4th switching tube Q4 also can select the switching tube that does not carry fly-wheel diode for use.In this embodiment, the 3rd switching tube Q3, the 4th switching tube Q4, the 6th switching tube Q6, the 7th switching tube Q7 all select the IGBT pipe for use.Certainly, in other embodiments, also may select the switching device of metal-oxide-semiconductor or other type for use.When switching tube is selected the IGBT pipe for use, second end of switching tube is its collector electrode, the 3rd end of switching tube is its emitter, first end of switching tube is its gate-drive utmost point, and the gate-drive utmost point connects the control circuit (not shown), and described control circuit is used for break-make frequency and the make-and-break time of each switching tube of control.When switching tube is selected metal-oxide-semiconductor for use, second end of switching tube is its drain electrode, and the 3rd end of switching tube is its source electrode, and first end of switching tube is its grid, and grid connects the control circuit (not shown), and described control circuit is used for break-make frequency and the make-and-break time of each switching tube of control.In this inversion unit 200, second end of the 6th switching tube Q6 connects center line (NEUTUAL), the 3rd end of the 6th switching tube Q6 connects the 3rd end of the 7th switching tube Q7, second end of the 7th switching tube Q7 connects the 3rd end of the 3rd switching tube Q3 respectively, first end of second end of the 4th switching tube Q4 and the second energy storage inductor L2, second end of the 3rd switching tube Q3 connects the positive pole of the first filter capacitor C1, the 3rd end of the 4th switching tube Q4 connects the negative pole of the second filter capacitor C2, second end of the second energy storage inductor L2 is the output of UPS module, the positive pole of the 3rd filter capacitor C3 connects second end of the second energy storage inductor L2, and the negative pole of the 3rd filter capacitor C3 connects center line (NEUTUAL).
The following describes the operation principle of the UPS module of this embodiment: at first explanation is, because PFC rectification unit 100, DC/DC converter unit 300 circuit structure with the PFC rectification unit 100 of embodiment two shown in Figure 3, DC/DC converter unit 300 respectively are identical, its operation principle also is identical, do not do at this and to give unnecessary details, below operation principle in the inversion stage only is described.At first explanation is, in this inversion unit 200, and the complementary break-make of the 3rd switching tube Q3 and the 7th switching tube Q7, the complementary break-make of the 4th switching tube Q4 and the 6th switching tube Q6.In the inversion stage, (1) the positive half cycle of output AC electricity, the 6th switching tube Q6 keeps normal open, it is normally closed that the 4th switching tube Q4 keeps, the 3rd switching tube Q3 is open-minded, when the 7th switching tube Q7 turn-offed, the first filter capacitor C1 gave the second energy storage inductor L2 energy storage by the 3rd switching tube Q3, the 3rd filter capacitor C3; (2) the positive half cycle of output AC electricity, the 6th switching tube Q6 keeps normal open, it is normally closed that the 4th switching tube Q4 keeps, the 3rd switching tube Q3 turn-offs, when the 7th switching tube Q7 opens, the second energy storage inductor L2 by the 3rd filter capacitor C3, the 6th switching tube Q6, with the 7th fly-wheel diode afterflow of the 7th switching tube Q7 reverse parallel connection; (3) negative half period of output AC electricity, the 7th switching tube Q7 keeps normal open, it is normally closed that the 3rd switching tube Q3 keeps, and the 4th switching tube Q4 opens, when the 6th switching tube Q6 turn-offs, and the second filter capacitor C2 gives the second energy storage inductor L2 energy storage by the 3rd filter capacitor C3, the 4th switching tube Q4; (4) negative half period of output AC electricity, the 7th switching tube Q7 keeps normal open, it is normally closed that the 3rd switching tube Q3 keeps, the 4th switching tube Q4 turn-offs, when the 6th switching tube Q6 opens, the second energy storage inductor L2 by the 7th switching tube Q7, with the 6th fly-wheel diode, the 3rd filter capacitor C3 afterflow of the 6th switching tube Q6 reverse parallel connection.
In addition, in other embodiments, the inversion unit 200 among the ups system embodiment three (shown in Figure 4) can be replaced to the inversion unit 200 among ups system embodiment four (shown in Figure 5) or the embodiment five (shown in Figure 6).
In the above-described embodiments, first switch S 1, the preferred relay switch of second switch S2.
Should be noted that, above embodiment all be the ups system that only comprises a UPS module be that example describes, certainly, the quantity of the UPS module in the ups system of the present invention also can be a plurality of, the output of these a plurality of UPS modules is in parallel, and these a plurality of UPS modules share a battery pack, namely, two outputs of the charhing unit of each UPS module connect two ports of battery pack respectively, and two inputs of the DC/DC converter unit of each UPS module connect two ports of battery pack respectively.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (11)
1. UPS module, be used for battery pack is discharged and recharged, described UPS module comprises the PFC rectification unit that connects successively, inversion unit and charhing unit, and at electric main just often, described PFC rectification unit converts electric main to direct voltage, and be positive and negative dc bus charging, described inversion unit is reverse into alternating current with the voltage between described positive and negative dc bus, and be that load is powered, simultaneously, described charhing unit charges to battery pack, it is characterized in that, described UPS module also comprises the DC/DC converter unit, and when electric main was unusual, described DC/DC converter unit was positive and negative dc bus charging with the output voltage of described battery pack by the timesharing of described PFC rectification unit.
2. UPS module according to claim 1, it is characterized in that, described PFC rectification unit comprises first energy storage inductor, first diode, second diode, the 4th diode, the 5th diode, first switching tube, the second switch pipe, first filter capacitor, second filter capacitor, wherein, first end of described first energy storage inductor connects an end of electric main, second end of described first energy storage inductor connects the positive pole of described first diode and the negative pole of described second diode respectively, the negative pole of described first diode connects second end of anodal and described first switching tube of described the 4th diode respectively, the positive pole of described second diode connects the negative pole of described the 5th diode and the 3rd end of described second switch pipe respectively, the 3rd end of described first switching tube is connected center line respectively with second end of described second switch pipe, the positive pole of described first filter capacitor connects the negative pole of described the 4th diode, the negative pole of described second filter capacitor connects the positive pole of described the 5th diode, and the positive pole of the negative pole of described first filter capacitor and described second filter capacitor is connected center line respectively.
3. UPS module according to claim 1, it is characterized in that, described PFC rectification unit comprises first energy storage inductor, first diode, second diode, first switching tube, second switch pipe, first filter capacitor, second filter capacitor, and first switching tube self has or first fly-wheel diode of external reverse parallel connection with it, and the second switch pipe self has or second fly-wheel diode of external reverse parallel connection with it; Wherein, first end of described first energy storage inductor connects an end of electric main, second end of described first energy storage inductor connects the positive pole of described first diode and the negative pole of described second diode respectively, the negative pole of described first diode connects the positive pole of described first filter capacitor, the positive pole of described second diode connects the negative pole of described second filter capacitor, the positive pole of the negative pole of described first filter capacitor and described second filter capacitor connects center line respectively, second end of described first switching tube connects the positive pole of described first diode, second end of described second switch pipe connects center line, and the 3rd end of described first switching tube is connected with the 3rd end of described second switch pipe.
4. according to claim 2 or 3 described UPS modules, it is characterized in that, described DC/DC converter unit comprises the 5th switching tube, the 3rd diode, wherein, second end of described the 5th switching tube connects the positive pole of described battery pack, the 3rd end of described the 5th switching tube connects first end of described first energy storage inductor, the negative pole of described battery pack connects center line, the positive pole of described the 3rd diode connects the positive pole of described second diode, and the negative pole of described the 3rd diode connects the 3rd end of described the 5th switching tube.
5. UPS module according to claim 4, it is characterized in that, described UPS module also comprises first switch and second switch, wherein, described first switch is connected between first end of electric main and described first energy storage inductor, and described second switch is connected between first end of the 3rd end of described the 5th switching tube and described first energy storage inductor.
6. UPS module according to claim 5 is characterized in that, described first switch and second switch are respectively relay switch.
7. according to claim 2 or 3 described UPS modules, it is characterized in that described inversion unit is two level inverter circuits, I type tri-level inversion circuit or T type tri-level inversion circuit.
8. UPS module according to claim 7 is characterized in that, described two level inverter circuits comprise the 3rd switching tube, the 4th switching tube, second energy storage inductor, the 3rd filter capacitor; Wherein, the 3rd switching tube self has or the 3rd fly-wheel diode of external reverse parallel connection with it, and the 4th switching tube self has or the 4th fly-wheel diode of external reverse parallel connection with it; Second end of described the 3rd switching tube connects the positive pole of described first filter capacitor, the 3rd end of described the 4th switching tube connects the negative pole of described second filter capacitor, the 3rd end of described the 3rd switching tube and second end of described the 4th switching tube are connected first end of described second energy storage inductor respectively, second end of described second energy storage inductor is the output of described UPS module, the positive pole of described the 3rd filter capacitor connects second end of described second energy storage inductor, and the negative pole of described the 3rd filter capacitor connects center line.
9. UPS module according to claim 7, it is characterized in that, described I type tri-level inversion circuit comprises the 3rd switching tube, the 4th switching tube, the 6th switching tube, the 7th switching tube, second energy storage inductor, the 3rd filter capacitor, the 6th diode and the 7th diode, wherein, second end of described the 3rd switching tube connects the positive pole of described first filter capacitor, the 3rd end of described the 3rd switching tube connects second end of described the 6th switching tube, the 3rd end of described the 6th switching tube connects second end of described the 7th switching tube, the 3rd end of described the 7th switching tube connects second end of described the 4th switching tube, the 3rd end of described the 4th switching tube connects the negative pole of described second filter capacitor, the negative pole of described the 6th diode connects the 3rd end of described the 3rd switching tube, the positive pole of described the 7th diode connects the 3rd end of described the 7th switching tube, the negative pole of the positive pole of described the 6th diode and described the 7th diode connects center line in the lump, first end of described second energy storage inductor connects the 3rd end of described the 6th switching tube, second end of described second energy storage inductor is the output of described UPS module, the positive pole of described the 3rd filter capacitor connects second end of described second energy storage inductor, and the negative pole of described the 3rd filter capacitor connects center line.
10. UPS module according to claim 7, it is characterized in that, described T type tri-level inversion circuit comprises the 3rd switching tube, the 4th switching tube, the 6th switching tube, the 7th switching tube, second energy storage inductor, the 3rd filter capacitor, and the 6th switching tube self has or the 6th fly-wheel diode of external reverse parallel connection with it, and the 7th switching tube self has or the 7th fly-wheel diode of external reverse parallel connection with it; Wherein, second end of described the 6th switching tube connects center line, the 3rd end of described the 6th switching tube connects the 3rd end of described the 7th switching tube, second end of described the 7th switching tube connects the 3rd end of described the 3rd switching tube respectively, second end of described the 4th switching tube and first end of described second energy storage inductor, second end of described the 3rd switching tube connects the positive pole of described first filter capacitor, the 3rd end of described the 4th switching tube connects the negative pole of described second filter capacitor, second end of described second energy storage inductor is the output of described UPS module, the positive pole of described the 3rd filter capacitor connects second end of described second energy storage inductor, and the negative pole of described the 3rd filter capacitor connects center line.
11. a ups system comprises at least two UPS modules that battery pack and UPS module or output are in parallel, and it is characterized in that described UPS module is each described UPS module of claim 1-10.
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| CN201110443945.7A CN103187787B (en) | 2011-12-27 | A kind of UPS module and ups system |
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| CN201110443945.7A CN103187787B (en) | 2011-12-27 | A kind of UPS module and ups system |
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| CN103187787A true CN103187787A (en) | 2013-07-03 |
| CN103187787B CN103187787B (en) | 2016-12-14 |
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