CN101673957B - Parallel uninterrupted power supply circuit - Google Patents
Parallel uninterrupted power supply circuit Download PDFInfo
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- CN101673957B CN101673957B CN2008102118591A CN200810211859A CN101673957B CN 101673957 B CN101673957 B CN 101673957B CN 2008102118591 A CN2008102118591 A CN 2008102118591A CN 200810211859 A CN200810211859 A CN 200810211859A CN 101673957 B CN101673957 B CN 101673957B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention discloses a parallel uninterrupted power supply circuit, which comprises a neutral line, a battery, a plurality of PFC boost converters, a rectifier bridge, a switch bridge, a control switch and an inverter, wherein the battery is provided with a positive pole and a negative pole; each PFC boost converter comprises a power factor correction circuit; the power factor correction circuit comprises an inductor which is provided with a first end and a second end; the first end is coupled to the positive pole; the rectifier bridge comprises a first shunt diode and a second shunt diode which are coupled to a first central point and is provided with a first end and a second end, wherein the first central point is coupled to the second end of the inductor, and the second end is coupled to the negative pole; the switch bridge comprises an upper switch and a lower switch which are coupled to a second central point and is provided with a first end and a second end, wherein the first end is coupled to the first end of the rectifier bridge; and the second end is coupled to the second end of the rectifier bridge; and the control switch is coupled to the neutral line of the second central point.
Description
Technical field
The invention discloses a kind of parallel uninterrupted power supply (uninterrupted power supply:UPS) circuit, relate in particular to and a kind of a plurality of uninterrupted power supplys are parallel to same battery pack and make these a plurality of uninterrupted power supplys can reach the circuit of current-sharing to each other.
Background technology
Uninterrupted power supply is applied to the key equipment electric power system, and Fig. 1 is typical online (online) ups system circuit diagram.Wherein this ups system comprises that a power factor correction (PFC) booster converter (comprises silicon control rectifying tube SCR1-SCR2, inductance L 1-L2, switch S 1-S2; Diode D1-D2 and capacitor C 1-C2), an inverter (comprising switches Si 1-Si2, inductance L i and output capacitance Co), controller (not shown) and battery pack (it comprises battery, silicon control rectifying tube SCR3-SCR4 and the fuse F2 with anodal and negative pole); This ups system also comprises input electromagnetic interface filter, fuse F1 and F3, inductance L f and the silicon control rectifying tube SCR5-SCR8 etc. of three inputs such as have the bypass alternating current (bypass AC), the normal alternating current (normal AC) and the neutral line (neutral) in addition.When exchanging (AC) or direct current (DC) pattern, wherein the PFC booster converter transforms to alternating current (AC) or direct current (DC) on the positive negative bus (bus), stable voltage is provided for the inverter of back one-level.
Rectification circuit in the PFC booster converter as shown in Figure 1 is connected the battery front end usually, and is made up of two rectifier switchs, please refer to two silicon control rectifying tube SCR1-SCR2 among Fig. 1.Input ac voltage needs to convert stable voltage into through a circuit of power factor correction (PFC circuit) after by the rectification circuit rectification to be exported, and then by the inverter output AC voltage.From efficient and the withstand voltage consideration of switch, traditional circuit of power factor correction is selected three-level PFC circuit usually for use, and it comprises to (boost) circuit that boosts in 1 power supply of positive bus capacitor C, gives the following booster circuit of negative bus capacitor C 2 power supplies.
Traditional on line type UPS for example shown in Figure 1 is when work, and in the time of in operating in the DC pattern, itself and AC pattern are shared three-level PFC circuit, and its concrete course of work please refer to Fig. 2 (a)-(b).When this tradition on line type UPS is operated in the DC mode of operation, the flow direction of electric current when Fig. 2 (a) is presented at the positive half cycle of DC pattern.The less dashed path in Fig. 2 (a) center is represented the electric current to inductance L 1, L2 charging.The bigger dashed path in the peripheral place of Fig. 2 (a) is represented the electric current of inductance afterflow to the C1 charging.Fig. 2 (b) shows the flow direction of electric current when this tradition on line type UPS is operated in DC pattern negative half period.Less dashed path is represented the electric current to inductance L 1, L2 charging in Fig. 2 (b) center.The bigger dashed path in the peripheral place of Fig. 2 (b) is represented the electric current of inductance afterflow to the C2 charging.Shown in Fig. 2 (c), when in positive half cycle, giving capacitor C 1 power supply that connects the bus-bar anode, following switch S 2 is switched on usually, and last switch S 1 is carried out pulse width modulation (PWM) copped wave; When giving capacitor C 2 power supplies that connect the bus-bar negative terminal, last switch S 1 general open, following switch S 2 is carried out PWM copped wave.Shown in Fig. 2 (d), the input of ups system comprises I/L and neutral line I/N, and from the angle of reliability, the neutral line will connect whole UPS always, up to the load end of output, links to each other with one of two terminals (O/L and O/N) of load.Above-mentioned traditional on line type UPS is in battery mode the time, because the positive and negative terminal of battery all will be connected to the neutral line with L2 through inductance L 1, voltage jump can take place so power at the neutral line when being pressed in switch, causes very big electromagnetic interference (EMI).In order to solve the EMI problem, please see that in Fig. 2 (d) two bypass diodes (DP and DN) are connected two inductance (L1 and L2) before after series connection, the mid point of two bypass diodes (DP and DN) is coupled to neutral line I/N simultaneously.So, switch S 1 or S2 one of them inductance when carrying out HF switch lost efficacy, and the EMI problem is greatly improved.Hence one can see that, and when traditional on line type UPS operated in the battery mode, the inductance of pfc circuit made its utilance have only 50% also with the work frequency alternation.
On the other hand, when the UPS parallel operation of many this type is arranged, when the client generally can hope in battery mode; All power models are all shared a battery pack, and this can bring a lot of benefits, as saving distribution; Be convenient to safeguard that the overall system reliability also can correspondingly improve etc.But the UPS of this traditional framework can't realize sharing many parallel connections of battery pack, and a plurality of UPS modules as shown in Figure 1 are shared a neutral line and can be caused two blocks current uneven and out of control after parallel connection.Positive half period in the DC pattern; Shown in Fig. 2 (a); When the inductance L 2 of two different UPS modules through the neutral line and be connected the neutral line and battery negative terminal between the time; Electric current will flow back to battery through the parallel circuits of two inductance L 2 after flowing through the L1 arrival neutral line, can be controlled by switch S 1 separately though flow through the electric current of the inductance L 1 of two UPS modules, in two inductance L 2; Each inductance is shared the concrete parameter how many electric currents depend on two inductance L 2 fully, and can't control current-sharing between the two with switch.In 2 (b), two inductance L 1 are shared the parameter that also depends on inductance L 1 through the electric current of the parallel circuits of neutral line formation equally.The parameter of inductance L 1 and L2 is relevant with manufacturing processing technic, material etc., and it is basic identical to be difficult to reach parameter.And magnetic element such as inductance is all by raw mineral materials manufacturings such as copper, iron, and along with expanding economy, its cost can be increasingly high.So, the electric current that flows through inductance in each UPS module is difficult to by independent control the input power of every UPS not waited, and causes the not current-sharing of inductive current concussion and switch, and a plurality of UPS modules of single battery group parallel connection also can't realize.
So find a method to make a plurality of UPS modules be parallel to a battery pack, reduce cost simultaneously, reduce volume and reduce EMI, be that industry is wanted the target that realizes always.
Summary of the invention
Therefore, the inventor through careful consideration, finally invents out the application " parallel uninterrupted power supply circuit " in view of the shortcoming of known technology.
The application's main purpose is to provide a kind of parallel uninterrupted power supply circuit; This circuit can be parallel to a battery pack with a plurality of UPS modules; And make each intermodule of UPS reach current-sharing, and and than traditional framework, can the deperm use of element of this circuit; And then the utmost point reduces the volume of UPS power module significantly and reduces EMI; Simultaneously because in each UPS module, all reduce by an inductance and increase a switch, thereby reduce its manufacturing cost relatively, and and then reduce the total cost of this parallel uninterrupted power supply circuit.
The application's another main purpose is to provide a kind of parallel uninterrupted power supply circuit, comprising: the neutral line; Battery, it has positive pole and negative pole, wherein should receive first direct voltage by positive pole; First power factor correction (PFC) booster converter; And the 2nd PFC booster converter.First power factor correcting step-up converter comprises first pfc circuit, and first pfc circuit is used to export the second and the 3rd direct voltage and comprises: first inductance, and it has first end and second end, and wherein this first end is coupled in this positive pole; First rectifier bridge, it comprises first and second bypass diodes that are coupled to first mid point, and has first and second ends, wherein this first mid point is coupled to this second end of this first inductance, and this second end of this first rectifier bridge is coupled to this negative pole; The first switch bridge, it comprise be coupled to second mid point first on switch and first time switch, and have first and second ends, wherein this first end is coupled to this first end of this first rectifier bridge, and this second end is coupled to this second end of this first rectifier bridge; First control switch, it has first, second and control end, and wherein this first end is coupled to this second mid point, and this second end is coupled to this neutral line; And first inverter, its receive this second with the 3rd direct voltage, and export first alternating voltage.The 2nd PFC booster converter comprises second circuit of power factor correction, and second circuit of power factor correction is used to export the 4th and the 5th direct voltage and comprises: second inductance, and it has first end and second end, and wherein this first end is coupled to this positive pole; Second rectifier bridge, it comprises third and fourth bypass diode that is coupled to the 3rd mid point, and has first and second ends, wherein the 3rd mid point is coupled to this second end of this second inductance, and this second end of this second rectifier bridge is coupled to this negative pole; The second switch bridge, it comprise be coupled to the 4th mid point second on switch and second time switch, and have first and second ends, wherein this first end is coupled to this first end of this second rectifier bridge, and this second end is coupled to this second end of this second rectifier bridge; Second control switch, it has first, second and control end, and wherein this first end is coupled to the 4th mid point, and this second end is coupled to this neutral line; And second inverter, its receive the 4th with the 5th direct voltage, and export this first alternating voltage.
According to above-mentioned conception; This circuit further comprises rectification circuit and has first end and the output capacitance of second end; Wherein this rectification circuit receives second alternating voltage, and exports this first direct voltage, this first with this second inverter respectively have first and second inputs and output; Respectively this first input end is coupled to the anode of direct current bus-bar; Respectively this second input is coupled to the negative terminal of direct current bus-bar, and respectively this output is coupled to this first end of this output capacitance, and this neutral line is coupled to this second end of this output capacitance.
According to above-mentioned conception; This first pfc circuit further comprises electric capacity on the diode on first, first, first time diode and first time electric capacity; Equal tool anode of each this diode and negative electrode; Each this electric capacity all has first and second ends; This on first this anode of diode be coupled to this first end of this first switch bridge, this on first this negative electrode of diode be coupled to this first end of this electric capacity on first and this first input end of this first inverter, this negative electrode of this first time diode is coupled to this second end of this first switch bridge; This anode of this first time diode is coupled to this second end of this first time electric capacity and this second input of this first inverter, and this second end of this electric capacity on first and this first end of this first time electric capacity all are coupled to this neutral line.
According to above-mentioned conception; This second pfc circuit further comprises electric capacity on the diode on second, second, second time diode and second time electric capacity; Each this diode all has anode and negative electrode; Each this electric capacity all has first and second ends; This on second this anode of diode be coupled to this first end of this second switch bridge, this on second this negative electrode of diode be coupled to this first end of this electric capacity on second and this first input end of this second inverter, this negative electrode of this second time diode is coupled to this second end of this second switch bridge; This anode of this second time diode is coupled to this second end of this second time electric capacity and this second input of this second inverter, and this second end of this electric capacity on second and this first end of this second time electric capacity all are coupled to this neutral line.
According to above-mentioned conception; This first pfc circuit further comprises electric capacity on the diode on first, first, the 3rd control switch and first time electric capacity; Equal tool anode of each this diode and negative electrode; Each this electric capacity all has first and second ends; The 3rd control switch has first, second and control end; This on first this anode of diode be coupled to this first end of this first switch bridge, this on first this negative electrode of diode be coupled to this first end of this electric capacity on first and this first input end of this first inverter, this second end of the 3rd control switch is coupled to this second end of this first switch bridge; This first end of the 3rd control switch is coupled to this second end of this first time electric capacity and this second input of this first inverter, and this second end of this electric capacity on first and this first end of this first time electric capacity all are coupled to this neutral line.
According to above-mentioned conception, the 3rd control switch is the IGBT with reverse parallel connection diode.
According to above-mentioned conception; This second pfc circuit further comprises electric capacity on the diode on second, second, the 4th control switch and second time electric capacity; Each this diode all has anode and negative electrode; Each this electric capacity all has first and second ends; The 4th control switch has first, second and control end; This on second this anode of diode be coupled to this first end of this second switch bridge, this on second this negative electrode of diode be coupled to this first end of this electric capacity on second and this first input end of this second inverter, this second end of the 4th control switch is coupled to this second end of this second switch bridge; This first end of the 4th control switch is coupled to this second end of this second time electric capacity and this second input of this second inverter, and this second end of this electric capacity on second and this first end of this second time electric capacity all are coupled to this neutral line.
According to above-mentioned conception, the 4th control switch is the IGBT with reverse parallel connection diode.
According to above-mentioned conception; This on first switch and this first time switch respectively have first, second and control end; This first end of this switch on first all is coupled to this second mid point with this second end of this first time switch; This on first this second end of switch be coupled to this first end of this first switch bridge, and this first end of this first time switch is coupled to this second end of this first switch bridge.
According to above-mentioned conception; This on second switch and this second time switch respectively have first, second and control end; This first end of this switch on second all is coupled to the 4th mid point with this second end of this second time switch; This on second this second end of switch be coupled to this first end of this second switch bridge, and this first end of this second time switch is coupled to this second end of this second switch bridge.
According to above-mentioned conception; Each this diode all has anode and negative electrode; This anode of this first bypass diode is coupled to this negative electrode and this first mid point of this second bypass diode; This negative electrode of this first bypass diode is coupled to this first end of this first rectifier bridge, and this anode of this second bypass diode is coupled to this second end of this first rectifier bridge.
According to above-mentioned conception; Each this diode all has anode and negative electrode; This anode of the 3rd bypass diode is coupled to this negative electrode and the 3rd mid point of the 4th bypass diode; This negative electrode of the 3rd bypass diode is coupled to this first end of this second rectifier bridge, and this anode of the 4th bypass diode is coupled to this second end of this second rectifier bridge.
According to above-mentioned conception; This first with this second control switch be IGBT with reverse parallel connection diode; This circuit can run on the DC mode with positive half cycle and negative half period or have the AC mode of positive half cycle and negative half period; And when this positive half cycle of this positive half cycle that is positioned at this DC mode and this AC mode; This first all is switched on this second control switch; And when this negative half period of this negative half period of this DC mode and this AC mode, this first all is turned off with this second control switch, this moment this first control switch this reverse parallel connection diode of this reverse parallel connection diode and this second control switch be used to prevent respectively this first with the refluence of first and second electric currents of this second control switch; And bear first and second revers voltages respectively, make this first and this second circuit of power factor correction between can reach current-sharing.
Next main purpose of this case is to provide a kind of parallel uninterrupted power supply circuit, comprises the neutral line; Battery, it has positive pole and negative pole, wherein should receive first direct voltage by positive pole; And a plurality of power factor correcting step-up converters.Each this PFC booster converter comprises pfc circuit, and pfc circuit is used to export the second and the 3rd direct voltage and comprises: inductance, and it has first end and second end, and this first end is coupled to this positive pole; Rectifier bridge, it comprises first and second bypass diodes that are coupled to first mid point, and has first and second ends, wherein this first mid point is coupled to this second end of this inductance, and this second end of this rectifier bridge is coupled to this negative pole; The switch bridge, it comprises the last switch and following switch that is coupled to second mid point, and has first and second ends, wherein this first end is coupled to this first end of this rectifier bridge, and this second end is coupled to this second end of this rectifier bridge; Control switch, it has first, second and control end, and wherein this first end is coupled to this second mid point, and this second end is coupled to this neutral line; And inverter, its receive this second with the 3rd direct voltage, and export first alternating voltage.
According to above-mentioned conception; This circuit further comprises rectification circuit and has first end and the output capacitance of second end; Wherein this rectification circuit receives second alternating voltage, and exports this first direct voltage, and each this inverter has first and second inputs and output; Respectively this first input end is coupled to the anode of direct current bus-bar; Respectively this second input is coupled to the negative terminal of direct current bus-bar, and respectively this output is coupled to this first end of this output capacitance, and this neutral line is coupled to this second end of this output capacitance.
According to above-mentioned conception; Each this pfc circuit further comprises diode, goes up electric capacity, following diode and following electric capacity; Each this diode all has anode and negative electrode; Each this electric capacity all has first and second ends; This anode that should go up diode is coupled to this first end of this switch bridge, and this negative electrode of diode is coupled to this first end of electric capacity on this and this first input end of this inverter on this, and this negative electrode of this time diode is coupled to this second end of this switch bridge; This anode of this time diode is coupled to this second end of this time electric capacity and this second input of this inverter, and this goes up this second end of electric capacity and this first end of this time electric capacity all is coupled to this neutral line.
According to above-mentioned conception; Each this pfc circuit further comprises diode, goes up electric capacity, electromagnetic interference (EMI) control switch and following electric capacity; Each this diode all has anode and negative electrode; Each this electric capacity all has first and second ends, and this EMI control switch has first, second and control end, and this anode of diode is coupled to this first end of this switch bridge on this; This negative electrode that should go up diode is coupled to this first end of electric capacity on this and this first input end of this inverter; This second end of this EMI control switch is coupled to this second end of this switch bridge, and this first end of this EMI control switch is coupled to this second end of this time electric capacity and this second input of this inverter, and this goes up this second end of electric capacity and this first end of this time electric capacity all is coupled to this neutral line.
According to above-mentioned conception; Should go up switch and this time switch and respectively have first, second and control end; Should go up this first end of switch and this second end of this time switch and all be coupled to this second mid point; This second end that should go up switch is coupled to this first end of this switch bridge, and this first end of this time switch is coupled to this second end of this switch bridge.
According to above-mentioned conception; Each this diode all has anode and negative electrode; This anode of this first bypass diode is coupled to this negative electrode and this first mid point of this second bypass diode; This negative electrode of this first bypass diode is coupled to this first end of this rectifier bridge, and this anode of this second bypass diode is coupled to this second end of this rectifier bridge.
According to above-mentioned conception; This control switch is the IGBT with reverse parallel connection diode, and this circuit can run on the DC mode with positive half cycle and negative half period or have the AC mode of positive half cycle and negative half period, and when this positive half cycle of this positive half cycle that is positioned at this DC mode and this AC mode; This control switch is switched on; And when this negative half period of this negative half period of this DC mode and this AC mode, this control switch is turned off, and this moment, this reverse parallel connection diode of this control switch was used to prevent the refluence of the electric current of this control switch; And bear revers voltage, make each this circuit of power factor correction can reach current-sharing each other.
Another main purpose of this case is to provide a kind of uninterrupted power supply circuit, comprising: the neutral line; Battery, it has positive pole and negative pole, wherein should receive first direct voltage by positive pole; And first power factor correcting step-up converter.The one PFC booster converter comprises first pfc circuit, and first pfc circuit is used to export the second and the 3rd direct voltage and comprises: first inductance, and it has first end and second end, and wherein this first end is coupled to this positive pole; First rectifier bridge, it comprises first and second bypass diodes that are coupled to first mid point, and has first and second ends, wherein this first mid point is coupled to this second end of this first inductance, and this second end of this first rectifier bridge is coupled to this negative pole; The first switch bridge, it comprise be coupled to second mid point first on switch and first time switch, and have first and second ends, wherein this first end is coupled to this first end of this first rectifier bridge, and this second end is coupled to this second end of this first rectifier bridge; First control switch, it has first, second and control end, and wherein this first end is coupled to this second mid point, and this second end is coupled to this neutral line; And first inverter, its receive this second with the 3rd direct voltage, and export first alternating voltage.
According to above-mentioned conception, this circuit further comprises second power factor correcting step-up converter.
For let above-mentioned purpose of the present invention, feature and advantage can be more obvious and understandable, the special preferred embodiment of lifting of hereinafter also cooperates appended diagram to carry out detailed explanation, as follows:
Description of drawings
Fig. 1: it shows the circuit diagram of known on line type UPS system;
Fig. 2 (a): it shows the flow direction of on line type UPS system electric current when the positive half cycle of DC pattern as shown in Figure 1;
Fig. 2 (b): it shows the flow direction of on line type UPS system electric current when DC pattern negative half period as shown in Figure 1;
Fig. 2 (c): it shows that on line type UPS system as shown in Figure 1 its output voltage when the positive and negative half cycle of DC pattern reaches the oscillogram of the drive signal of switch down with last switch;
Fig. 2 (d): it shows the circuit diagram of another known on line type UPS system;
Fig. 3: it shows the circuit diagram according to the on line type UPS system of first preferred embodiment of the present invention's conception;
Fig. 4: it shows the circuit diagram according to the online parallel UPS system of second preferred embodiment of the present invention's conception;
Fig. 5: it shows that the oscillogram that high frequency saltus step EMI disturbs appears in online parallel UPS system as shown in Figure 4 when inductance discharges and recharges;
Fig. 6: it shows the circuit diagram according to the online parallel UPS system of the 3rd preferred embodiment of the present invention's conception; And
Fig. 7: it shows the circuit diagram according to the online parallel UPS system of the 4th preferred embodiment of the present invention's conception.
Embodiment
Circuit according to first preferred embodiment of the present invention conception please be seen Fig. 3, in Fig. 3, has only an inductance, that is, inductance L p is used for carrying out the PFC Active PFC, and is connected before rectifier bridge DP and the DN, and after the battery.When the AC pattern, be that the positive half cycle or the negative half period of input voltage all carries out conversion with this inductance L p.After AC cuts off; System gets into DC (battery) mode of operation; Before the anode of this battery pack is connected to PFC inductance L p through silicon control rectifying tube SCR3; When the DC pattern, the AC switch turn-offs, and battery pack transfers energy to direct current bus-bar anode/negative terminal through shared pfc circuit and comes to inverter power supply.The battery pack negative pole is connected to the following switch S 2 of PFC through a silicon control rectifying tube SCR4.
In order to make many ups systems can parallel running when the work of shared battery pack; Require no matter to be battery pack give the capacitances to supply power that is connected to direct current bus-bar anode or to the capacitances to supply power that is connected to direct current bus-bar negative terminal; The UPS module of every parallel connection can independently be controlled it from sharing the electric current that battery extracts; That is to say, can independently control its input current, but do not make it produce the problems such as not current-sharing and current oscillation between power model because share the circuit of battery to connect.The method that adopts among the present invention is between the neutral line and PFC switch, to add the IGBT (shown in the S3 among Fig. 3) with inverse parallel secondary body D3, makes the battery pack negative terminal and the neutral line have controlled decoupling zero switch S 3.Circuit of the present invention is identical with the working method of prior art among Fig. 2; But because inductance has only a Lp; And be positioned at before the rectifier bridge; So when two UPS modules parallel connections of second preferred embodiment according to the present invention's conception as shown in Figure 4, only have the situation of the inductance parallel connection of two UPS modules at the negative half-cycle of DC pattern.The concrete course of work please be seen the electric current road warp of Fig. 2 (b), or the drive signal in negative half period period among 2 (c).Interim when the negative half period of DC pattern; S1 is long logical, and S2 makes the PWM switch, and the input inductance in two UPS modules among Fig. 4 is actually through neutral line N parallel connection; In order to solve current unevenness and the problem out of control that parallel connection brings, way is to prevent parallel connection the most completely.S3 among Fig. 4 and reverse parallel connection diode D3 thereof can realize this function.Wherein S3 is long logical at the positive half cycle of AC mode and DC pattern; When the negative half period of inductance parallel connection occurring, turn-off decoupling zero switch S 3; Prevent the refluence of electric current and bear withstand voltage by S3 diode connected in parallel D3; Like this, two inductance just can not be coupled to together, and the electric current that flows through inductance L p has also just only been controlled by the switch of S2.When aforementioned DC pattern owing to share between battery operated and the parallelly connected power model that brings of inverter can't current-sharing problem, also obtained solution.
Circuit (like Fig. 3) according to first preferred embodiment of the present invention conception; In the induction charging stage of DC pattern negative half period S1 and the equal conducting of S2; Electric current flows through S1, S2 and SCR4 gets back to battery negative terminal; Because decoupling zero this moment switch S 3 is turn-offed, (neutral line voltage 0, negative bus voltage normally-400V) will bear also dividing potential drop by the diode D3 and the D2 of two not conductings to the last voltage of C2.So the cathode terminal voltage of D2 is-200V.But in the inductive discharge stage, electric current flows through the path of D3, C2 and D2, and the D2 conducting is so the voltage of D2 cathode terminal equals-400V.The EMI interference source that from-200 to-400 high frequency saltus step so just occurred is shown in the oscillogram of the output voltage V o of the output capacitance Co of Fig. 5.In order further to improve effect of the present invention; The circuit of the 3rd preferred embodiment according to the present invention's conception as shown in Figure 6 on original D2 parallel connection a switch S 4;, so no matter to be in aforesaid induction charging or discharge regime, to keep D2 cathode terminal voltage to be-400V only at the negative half period conducting S4 of DC pattern.In Fig. 6, because D1 has been the diode that can bear high pressure 800V, so; In the circuit of the 4th preferred embodiment of conceiving according to the present invention as shown in Figure 7, can the anode of D1 directly be received PFC inductance L p, replace DP with silicon control rectifying tube SCR9 simultaneously; The anode of SCR9 is coupled to the anode of D1; And the negative electrode of SCR9 is coupled to the negative electrode of S1, thereby can reduce the on-state loss of some SCR9, and the various operating states of system are unaffected.
The present invention is through reducing the utilance that an inductance has improved inductance; And the price of an inductance will be far above the price of the control of being added (decoupling zero) switch S 3, so the present invention has also reduced cost.The present invention makes a plurality of UPS modules can share the problem that a Battery pack is not worried current-sharing through adding a decoupling zero switch S 3, has solved the EMI problem through adding a control switch S4 simultaneously.At last, the present invention also can replace DP with silicon control rectifying tube SCR9 through the anode of D1 is directly received PFC inductance L p simultaneously, saves the on-state loss of some SCR9.The present invention has accomplished original function on the basis that reduces cost, and can realize a plurality of module parallel connections.
In sum, the invention discloses a kind of parallel uninterrupted power supply circuit, this circuit can be parallel to a battery pack with a plurality of UPS modules; And make each intermodule of UPS reach current-sharing; And than traditional framework, can the deperm use of element of this circuit, and then the utmost point volume that reduces the UPS power module significantly with reduce EMI; Simultaneously because all reduce by an inductance and increase a switch in each UPS module; Thereby reduce its manufacturing cost relatively, and and then reduce the overall cost of this parallel uninterrupted power supply circuit, thereby its progressive and novelty are arranged really.
Therefore, though describe the application in detail through the foregoing description, those skilled in the art can carry out various variations and change, and does not break away from the scope of liking the claim protection enclosed.
Claims (13)
1. uninterrupted power supply circuit comprises:
The neutral line;
Battery, it has positive pole and negative pole, wherein said anodal first direct voltage that receives;
First power factor correcting step-up converter, it comprises:
First circuit of power factor correction, it is used to export second direct voltage and the 3rd direct voltage, and comprises:
First inductance, it has first end and second end, and wherein said first end is coupled to said positive pole;
First rectifier bridge; It comprises first bypass diode and second bypass diode that is coupled to first mid point; And have first end and second end, wherein said first mid point is coupled to said second end of said first inductance, and said second end of said first rectifier bridge is coupled to said negative pole;
The first switch bridge; It comprises be coupled to second mid point first on switch and first time switch; And have first end and second end; Said first end of the wherein said first switch bridge is coupled to said first end of said first rectifier bridge, and said second end of the said first switch bridge is coupled to said second end of said first rectifier bridge;
First control switch, it has first end, second end and control end, and wherein said first end is coupled to said second mid point, and said second end is coupled to the said neutral line; And
First inverter has the first input end and second input, and it receives said second direct voltage and said the 3rd direct voltage, and exports first alternating voltage,
Wherein said first circuit of power factor correction also comprises diode on first, first time diode; Each said diode all has anode and negative electrode; The said anode of diode is coupled to said first end of the said first switch bridge on said first; The said negative electrode of diode is coupled to the said first input end of said first inverter on said first; The said negative electrode of said first time diode is coupled to said second end of the said first switch bridge, and the said anode of said first time diode is coupled to said second input of said first inverter.
2. uninterrupted power supply circuit as claimed in claim 1; Further comprise rectification circuit, have anode and negative terminal in order to the first direct current bus-bar of exporting said second direct voltage and said the 3rd direct voltage respectively, have anode and negative terminal in order to the second direct current bus-bar of exporting the 4th direct voltage and the 5th direct voltage respectively, output capacitance and second power factor correcting step-up converter with first end and second end, it comprises:
Second circuit of power factor correction, it is used to export said the 4th direct voltage and said the 5th direct voltage, and comprises:
Second inductance, it has first end and second end, and wherein said first end is coupled to said positive pole;
Second rectifier bridge; It comprises the 3rd bypass diode and the 4th bypass diode that is coupled to the 3rd mid point; And have first end and second end, wherein said the 3rd mid point is coupled to said second end of said second inductance, and said second end of said second rectifier bridge is coupled to said negative pole;
The second switch bridge; It comprises be coupled to the 4th mid point second on switch and second time switch; And have first end and second end; Said first end of wherein said second switch bridge is coupled to said first end of said second rectifier bridge, and said second end of said second switch bridge is coupled to said second end of said second rectifier bridge;
Second control switch, it has first end, second end and control end, and wherein said first end is coupled to said the 4th mid point, and said second end is coupled to the said neutral line; And
Second inverter has the first input end and second input, and it receives said the 4th direct voltage and said the 5th direct voltage, and exports said first alternating voltage,
Wherein said second circuit of power factor correction also comprises diode on second, second time diode; Each said diode all has anode and negative electrode; The said anode of diode is coupled to said first end of said second switch bridge on said second; The said negative electrode of diode is coupled to the said first input end of said second inverter on said second; The said negative electrode of said second time diode is coupled to said second end of said second switch bridge; And the said anode of said second time diode is coupled to said second input of said second inverter; Said rectification circuit receives second alternating voltage, and exports said first direct voltage, and said first inverter and said second inverter respectively have output; The said first input end of said first inverter and said second input are coupled to the said anode and the said negative terminal of the said first direct current bus-bar respectively; The said first input end of said second inverter and said second input are coupled to the said anode and the said negative terminal of the said second direct current bus-bar respectively, and each said output is coupled to said first end of said output capacitance, and the said neutral line is coupled to said second end of said output capacitance.
3. uninterrupted power supply circuit as claimed in claim 2, wherein:
Said first circuit of power factor correction further comprises electric capacity and first time electric capacity on first; Each said electric capacity all has first end and second end; The said negative electrode of diode is coupled to said first end of electric capacity on said first on said first; The said anode of said first time diode is coupled to said second end of said first time electric capacity, and said second end of electric capacity and said first end of said first time electric capacity all are coupled to the said neutral line on said first; And
Said second circuit of power factor correction further comprises electric capacity and second time electric capacity on second; Each said electric capacity all has first end and second end; The said negative electrode of diode is coupled to said first end of electric capacity on said second on said second; The said anode of said second time diode is coupled to said second end of said second time electric capacity, and said second end of electric capacity and said first end of said second time electric capacity all are coupled to the said neutral line on said second.
4. uninterrupted power supply circuit as claimed in claim 3; Wherein said first circuit of power factor correction further comprises the 3rd control switch with said first time diode; Said the 3rd control switch has first end, second end and control end; Said second end of said the 3rd control switch is coupled to said second end of the said first switch bridge, and said first end of said the 3rd control switch is coupled to said second end of said first time electric capacity and said second input of said first inverter.
5. uninterrupted power supply circuit as claimed in claim 4, wherein:
Said second circuit of power factor correction further comprises the 4th control switch with said second time diode; Said the 4th control switch has first end, second end and control end; Said second end of said the 4th control switch is coupled to said second end of said second switch bridge, and said first end of said the 4th control switch is coupled to said second end of said second time electric capacity and said second input of said second inverter.
6. uninterrupted power supply circuit as claimed in claim 2, wherein:
Switch and said first time switch respectively have first end, second end and control end on said first; Said second end of said first end of switch and said first time switch all is coupled to said second mid point on said first; Said second end of switch is coupled to said first end of the said first switch bridge on said first, and said first end of said first time switch is coupled to said second end of the said first switch bridge; And/or
Switch and said second time switch respectively have first end, second end and control end on said second; Said second end of said first end of switch and said second time switch all is coupled to said the 4th mid point on said second; Said second end of switch is coupled to said first end of said second switch bridge on said second, and said first end of said second time switch is coupled to said second end of said second switch bridge.
7. uninterrupted power supply circuit as claimed in claim 2; Wherein: the said anode of said first bypass diode is coupled to the said negative electrode and said first mid point of said second bypass diode; The said negative electrode of said first bypass diode is coupled to said first end of said first rectifier bridge, and the said anode of said second bypass diode is coupled to said second end of said first rectifier bridge; Or
The said anode of said the 3rd bypass diode is coupled to the said negative electrode and said the 3rd mid point of said the 4th bypass diode; The said negative electrode of said the 3rd bypass diode is coupled to said first end of said second rectifier bridge, and the said anode of said the 4th bypass diode is coupled to said second end of said second rectifier bridge.
8. uninterrupted power supply circuit as claimed in claim 2; Wherein said first control switch and said second control switch are the IGBT with reverse parallel connection diode; Said uninterrupted power supply circuit can run on the DC mode with positive half cycle and negative half period or have the AC mode of positive half cycle and negative half period; And when the said positive half cycle of said positive half cycle that is positioned at said DC mode and said AC mode, said first control switch and said second control switch all are switched on; And when the said negative half period of the said negative half period of said DC mode and said AC mode; Said first control switch and said second control switch all are turned off; This moment, the said reverse parallel connection diode of said reverse parallel connection diode and said second control switch of said first control switch was used to prevent respectively the refluence of first electric current and second electric current of said first control switch and said second control switch; And bear first revers voltage and second revers voltage respectively, make between said first circuit of power factor correction and said second circuit of power factor correction to reach current-sharing.
9. uninterrupted power supply circuit comprises:
The neutral line;
Battery, it has positive pole and negative pole, wherein said anodal first direct voltage that receives;
A plurality of power factor correcting step-up converters, each said power factor correcting step-up converter comprises:
Circuit of power factor correction, it is used to export the second and the 3rd direct voltage, and comprises:
Inductance, it has first end and second end, and said first end is coupled to said positive pole;
Rectifier bridge; It comprises first bypass diode and second bypass diode that is coupled to first mid point; And have first end and second end, wherein said first mid point is coupled to said second end of said inductance, and said second end of said rectifier bridge is coupled to said negative pole;
The switch bridge; It comprises the last switch and following switch that is coupled to second mid point; And have first end and second end, said first end of wherein said switch bridge is coupled to said first end of said rectifier bridge, and said second end of said switch bridge is coupled to said second end of said rectifier bridge;
Control switch, it has first end, second end and control end, and wherein said first end is coupled to said second mid point, and said second end is coupled to the said neutral line; And
Inverter has the first input end and second input, and it receives said second direct voltage and said the 3rd direct voltage, and exports first alternating voltage,
Wherein each said circuit of power factor correction also comprises diode, following diode; Each said diode all has anode and negative electrode; The said said anode of going up diode is coupled to said first end of said switch bridge; The said said negative electrode of going up diode is coupled to the said first input end of said inverter, and the said said negative electrode of diode down is coupled to said second end of said switch bridge, and the said said anode of diode down is coupled to said second input of said inverter.
10. uninterrupted power supply circuit as claimed in claim 9; Further comprise rectification circuit, a plurality ofly respectively have the direct current bus-bar of anode and negative terminal and have first end and the output capacitance of second end; Wherein said rectification circuit receives second alternating voltage, and exports said first direct voltage, and each said inverter has output; Each said first input end is coupled to the said anode of each corresponding direct current bus-bar; Each said second input is coupled to the said negative terminal of each corresponding direct current bus-bar, and each said output is coupled to said first end of said output capacitance, and the said neutral line is coupled to said second end of said output capacitance.
11. uninterrupted power supply circuit as claimed in claim 10, wherein:
Each said circuit of power factor correction further comprises electric capacity and following electric capacity; Each said electric capacity all has first end and second end; The said said negative electrode of going up diode is coupled to said said first end of going up electric capacity; The said said anode of diode down is coupled to said said second end of electric capacity down, and said said second end and said said first end of electric capacity down of going up electric capacity all is coupled to the said neutral line; Or
Each said circuit of power factor correction further comprises electric capacity, has said the electromagnetic interference control switch and the following electric capacity of diode down; Each said electric capacity all has first end and second end; Said electromagnetic interference control switch has first end, second end and control end; The said said negative electrode of going up diode is coupled to said said first end of going up electric capacity; Said second end of said electromagnetic interference control switch is coupled to said second end of said switch bridge; Said first end of said electromagnetic interference control switch is coupled to said said second end of electric capacity down and said second input of said inverter, and said said second end and said said first end of electric capacity down of going up electric capacity all is coupled to the said neutral line.
12. uninterrupted power supply circuit as claimed in claim 9, wherein:
Said upward switch and said switch down respectively have first end, second end and control end; Said said first end and said said second end of switch down of going up switch all is coupled to said second mid point; Said said second end of going up switch is coupled to said first end of said switch bridge, and said said first end of switch down is coupled to said second end of said switch bridge; And/or
The said anode of said first bypass diode is coupled to the said negative electrode and said first mid point of said second bypass diode; The said negative electrode of said first bypass diode is coupled to said first end of said rectifier bridge, and the said anode of said second bypass diode is coupled to said second end of said rectifier bridge.
13. uninterrupted power supply circuit as claimed in claim 9; Wherein said control switch is the IGBT with reverse parallel connection diode; Said uninterrupted power supply circuit can run on the DC mode with positive half cycle and negative half period or have the AC mode of positive half cycle and negative half period; And when the said positive half cycle of said positive half cycle that is positioned at said DC mode and said AC mode, said control switch is switched on; And when the said negative half period of the said negative half period of said DC mode and said AC mode; Said control switch is turned off; This moment, the said reverse parallel connection diode of said control switch was used to prevent the refluence of the electric current of said control switch; And bear revers voltage, make each said circuit of power factor correction can reach current-sharing each other.
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| CN2008102118591A CN101673957B (en) | 2008-09-11 | 2008-09-11 | Parallel uninterrupted power supply circuit |
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| CN2008102118591A CN101673957B (en) | 2008-09-11 | 2008-09-11 | Parallel uninterrupted power supply circuit |
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