CN101673957A - Parallel uninterrupted power supply circuit - Google Patents
Parallel uninterrupted power supply circuit Download PDFInfo
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- CN101673957A CN101673957A CN200810211859A CN200810211859A CN101673957A CN 101673957 A CN101673957 A CN 101673957A CN 200810211859 A CN200810211859 A CN 200810211859A CN 200810211859 A CN200810211859 A CN 200810211859A CN 101673957 A CN101673957 A CN 101673957A
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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
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- 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
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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 diodewhich 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 firstend 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 ofly 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, the inductance L f of three inputs such as have the bypass alternating current (bypass AC), the normal alternating current (normal AC) and the neutral line (neutral) and silicon control rectifying tube SCR5-SCR8 etc. 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 after by the rectification circuit rectification to be converted to stable voltage output by a circuit of power factor correction (PFC circuit), and then by the inverter output AC voltage.For 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.Represent electric current in the less dashed path in Fig. 2 (b) center to inductance L 1, L2 charging.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 giving capacitor C 1 power supply that connects the bus-bar anode in positive half cycle, 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 is opened usually, and 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 by inductance L 1 and L2, 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 wish 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 are as shown in Figure 1 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 by 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, though flowing through the electric current of the inductance L 1 of two UPS modules can be controlled by switch S 1 separately, but 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 between the two current-sharing with switch.In 2 (b), two inductance L 1 are shared the parameter that also depends on inductance L 1 by 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 more and more higher.So, the electric current that flows through inductance in each UPS module is difficult to independently be controlled, and the input power of every UPS is not waited, and causes the not current-sharing of inductive current concussion and switch, and single battery group a plurality of UPS modules in parallel 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 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 and the 3rd direct voltage, and export first alternating voltage.The 2nd PFC booster converter comprises second circuit of power factor correction, second circuit of power factor correction be used to export this second and the 3rd direct voltage and comprising: second inductance, it has first end and second end, 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 this second and the 3rd 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 export this first direct voltage, this first and 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, 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 diode on first, electric capacity on 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 diode on second, electric capacity on 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 diode on first, electric capacity on 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 diode on second, electric capacity on 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 and this second end of this first time switch all are coupled to this second mid point, 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 and this second end of this second time switch all are coupled to the 4th mid point, 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 and 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 and this second control switch all be switched on, and when this negative half period of this negative half period of this DC mode and this AC mode, this first and this second control switch all be turned off, this moment this reverse parallel connection diode of this first control switch and this second control switch this reverse parallel connection diode be used to prevent respectively this first and 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 last switch and the 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 export this first direct voltage, 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, 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, last 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, 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 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, last 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, this EMI control switch has first, second and control end, this anode that should go up diode is coupled to this first end of this switch bridge, 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, 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, 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, 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 and 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 allow above-mentioned purpose of the present invention, feature and advantage can be more obvious and understandable, preferred embodiment cited below particularly also cooperates appended diagram to be described in detail, and is 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 its output voltage when the positive and negative half cycle of DC pattern as shown in Figure 1 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 see Figure 3, has only an inductance in Fig. 3, that is, inductance L 1 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 1.After AC cuts off, system enters DC (battery) mode of operation, before the anode of this battery pack is connected to PFC inductance L p by 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 by shared pfc circuit and comes to inverter power supply.The battery pack negative pole is connected to the following switch S 2 of PFC by 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 not make it produce problems such as not current-sharing between power model and current oscillation because share the circuit of battery to connect.The method that adopts among the present invention is to add the IGBT (shown in the S3 among Fig. 3) with inverse parallel secondary body D3 between the neutral line and PFC switch, 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 according to second preferred embodiment of the present invention conception as shown in Figure 4 are in parallel, 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 see Figure the electric current road warp of 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 by 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 inverter power model that brings in parallel can't current-sharing problem, also obtained solution.
Circuit (as 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 voltage on the 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, as shown in Figure 6 according to the circuit of the 3rd preferred embodiment of the present invention conception switch S 4 in parallel on original D2,, 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 circuit as shown in Figure 7 according to the 4th preferred embodiment of the present invention conception, the anode of D1 directly can 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 by 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 by adding a decoupling zero switch S 3, has solved the EMI problem by adding a control switch S4 simultaneously.At last, the present invention also can replace DP with silicon control rectifying tube SCR9 simultaneously by the anode of D1 is directly received PFC inductance L p, saves the on-state loss of some SCR9.The present invention has finished 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 reduces the volume of UPS power module significantly and reduces 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 by the foregoing description, those skilled in the art can carry out various variations and change, and does not break away from the scope as the claims protection.
Claims (15)
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 described 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 described second end of described first inductance, and described second end of described first rectifier bridge is coupled to described negative pole;
The first switch bridge, it comprise be coupled to second mid point first on switch and first time switch, and have first end and second end, described first end of the wherein said first switch bridge is coupled to described first end of described first rectifier bridge, and described second end of the described first switch bridge is coupled to described second end of described first rectifier bridge;
First control switch, it has first end, second end and control end, and wherein said first end is coupled to described second mid point, and described second end is coupled to the described neutral line; And
First inverter, it receives described second direct voltage and described the 3rd direct voltage, and exports first alternating voltage; And
Second power factor correcting step-up converter, it comprises:
Second circuit of power factor correction, it is used to export described second direct voltage and described the 3rd direct voltage, and comprises:
Second inductance, it has first end and second end, and wherein said first end is coupled to described 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 described second end of described second inductance, and described second end of described second rectifier bridge is coupled to described 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 end and second end, described first end of wherein said second switch bridge is coupled to described first end of described second rectifier bridge, and described second end of described second switch bridge is coupled to described second end of described second rectifier bridge;
Second control switch, it has first end, second end and control end, and wherein said first end is coupled to described the 4th mid point, and described second end is coupled to the described neutral line; And
Second inverter, it receives described second direct voltage and described the 3rd direct voltage, and exports described first alternating voltage.
2. circuit as claimed in claim 1, further comprise rectification circuit and have first end and the output capacitance of second end, wherein said rectification circuit receives second alternating voltage, and export described first direct voltage, described first inverter and described second inverter respectively have first input end and second input and output, each described first input end is coupled to the anode of direct current bus-bar, each described second input is coupled to the negative terminal of direct current bus-bar, each described output is coupled to described first end of described output capacitance, and the described neutral line is coupled to described second end of described output capacitance.
3. circuit as claimed in claim 2, wherein:
Described first circuit of power factor correction further comprises diode on first, electric capacity on first, first time diode and first time electric capacity, each described diode all has anode and negative electrode, each described electric capacity all has first end and second end, the described anode of diode is coupled to described first end of the described first switch bridge on described first, the described negative electrode of diode is coupled to described first end of electric capacity on described first and the described first input end of described first inverter on described first, the described negative electrode of described first time diode is coupled to described second end of the described first switch bridge, the described anode of described first time diode is coupled to described second end of described first time electric capacity and described second input of described first inverter, and described second end of electric capacity and described first end of described first time electric capacity all are coupled to the described neutral line on described first; And
Described second circuit of power factor correction further comprises diode on second, electric capacity on second, second time diode and second time electric capacity, each described diode all has anode and negative electrode, each described electric capacity all has first end and second end, the described anode of diode is coupled to described first end of described second switch bridge on described second, the described negative electrode of diode is coupled to described first end of electric capacity on described second and the described first input end of described second inverter on described second, the described negative electrode of described second time diode is coupled to described second end of described second switch bridge, the described anode of described second time diode is coupled to described second end of described second time electric capacity and described second input of described second inverter, and described second end of electric capacity and described first end of described second time electric capacity all are coupled to the described neutral line on described second.
4. circuit as claimed in claim 2, wherein said first pfc circuit further comprises diode on first, electric capacity on first, the 3rd control switch and first time electric capacity, each described diode all has anode and negative electrode, each described electric capacity all has first end and second end, described the 3rd control switch has first end, second end and control end, the described anode of diode is coupled to described first end of the described first switch bridge on described first, the described negative electrode of diode is coupled to described first end of electric capacity on described first and the described first input end of described first inverter on described first, described second end of described the 3rd control switch is coupled to described second end of the described first switch bridge, described first end of described the 3rd control switch is coupled to described second end of described first time electric capacity and described second input of described first inverter, and described second end of electric capacity and described first end of described first time electric capacity all are coupled to the described neutral line on described first.
5. circuit as claimed in claim 4, wherein:
Described the 3rd control switch is the IGBT with reverse parallel connection diode; Or
Described second pfc circuit further comprises diode on second, electric capacity on second, the 4th control switch and second time electric capacity, each described diode all has anode and negative electrode, each described electric capacity all has first and second ends, described the 4th control switch has first end, second end and control end, the described anode of diode is coupled to described first end of described second switch bridge on described second, the described negative electrode of diode is coupled to described first end of electric capacity on described second and the described first input end of described second inverter on described second, described second end of described the 4th control switch is coupled to described second end of described second switch bridge, described first end of described the 4th control switch is coupled to described second end of described second time electric capacity and described second input of described second inverter, and described first end of described second end of electric capacity and described second time electric capacity all is coupled to the described neutral line on described second, and wherein said the 4th control switch is the IGBT with reverse parallel connection diode.
6. circuit as claimed in claim 1, wherein:
Switch and described first time switch respectively have first end, second end and control end on described first, described second end of described first end of switch and described first time switch all is coupled to described second mid point on described first, described second end of switch is coupled to described first end of the described first switch bridge on described first, and described first end of described first time switch is coupled to described second end of the described first switch bridge; And/or
Switch and described second time switch respectively have first end, second end and control end on described second, described second end of described first end of switch and described second time switch all is coupled to described the 4th mid point on described second, described second end of switch is coupled to described first end of described second switch bridge on described second, and described first end of described second time switch is coupled to described second end of described second switch bridge.
7. as 1 described circuit of claim the, wherein: each described diode all has anode and negative electrode, the described anode of described first bypass diode is coupled to the described negative electrode and described first mid point of described second bypass diode, the described negative electrode of described first bypass diode is coupled to described first end of described first rectifier bridge, and the described anode of described second bypass diode is coupled to described second end of described first rectifier bridge; Or
Each described diode all has anode and negative electrode, the described anode of described the 3rd bypass diode is coupled to the described negative electrode and described the 3rd mid point of described the 4th bypass diode, the described negative electrode of described the 3rd bypass diode is coupled to described first end of described second rectifier bridge, and the described anode of described the 4th bypass diode is coupled to described second end of described second rectifier bridge.
8. circuit as claimed in claim 1, wherein said first control switch and described second control switch are the IGBT with reverse parallel connection diode, described 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 described positive half cycle of described positive half cycle that is positioned at described DC mode and described AC mode, described first control switch and described second control switch all are switched on; And when the described negative half period of the described negative half period of described DC mode and described AC mode, described first control switch and described second control switch all are turned off, this moment, the described reverse parallel connection diode of the described reverse parallel connection diode of described first control switch and described second control switch was used to prevent respectively the refluence of first electric current and second electric current of described first control switch and described second control switch, and bear first revers voltage and second revers voltage respectively, make between described first pfc circuit and described second pfc circuit 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 described 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 described first end is coupled to described 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 described second end of described inductance, and described second end of described rectifier bridge is coupled to described negative pole;
The switch bridge, it comprises last switch and the following switch that is coupled to second mid point, and have first end and second end, described first end of wherein said switch bridge is coupled to described first end of described rectifier bridge, and described second end of described switch bridge is coupled to described second end of described rectifier bridge;
Control switch, it has first end, second end and control end, and wherein said first end is coupled to described second mid point, and described second end is coupled to the described neutral line; And
Inverter, it receives described second direct voltage and described the 3rd direct voltage, and exports first alternating voltage.
10. circuit as claimed in claim 9, further comprise rectification circuit and have first end and the output capacitance of second end, wherein said rectification circuit receives second alternating voltage, and export described first direct voltage, each described inverter has first input end and second input and output, each described first input end is coupled to the anode of direct current bus-bar, each described second input is coupled to the negative terminal of direct current bus-bar, each described output is coupled to described first end of described output capacitance, and the described neutral line is coupled to described second end of described output capacitance.
11. as 10 described circuit of claim the, wherein:
Each described circuit of power factor correction further comprises diode, last electric capacity, following diode and following electric capacity, each described diode all has anode and negative electrode, each described electric capacity all has first end and second end, the described described anode of going up diode is coupled to described first end of described switch bridge, the described described negative electrode of going up diode is coupled to described described first end of electric capacity and the described first input end of described inverter gone up, the described described negative electrode of diode down is coupled to described second end of described switch bridge, the described described anode of diode down is coupled to described described second end of electric capacity down and described second input of described inverter, and described described second end and described described first end of electric capacity down of going up electric capacity all is coupled to the described neutral line; Or
Each described pfc circuit further comprises diode, last electric capacity, electromagnetic interference control switch and following electric capacity, each described diode all has anode and negative electrode, each described electric capacity all has first end and second end, described electromagnetic interference control switch has first end, second end and control end, the described described anode of going up diode is coupled to described first end of described switch bridge, the described described negative electrode of going up diode is coupled to described described first end of electric capacity and the described first input end of described inverter gone up, described second end of described electromagnetic interference control switch is coupled to described second end of described switch bridge, described first end of described electromagnetic interference control switch is coupled to described described second end of electric capacity down and described second input of described inverter, and described described second end and described described first end of electric capacity down of going up electric capacity all is coupled to the described neutral line.
12. circuit as claimed in claim 9, wherein:
Described upward switch and described switch down respectively have first end, second end and control end, described described first end and described described second end of switch down of going up switch all is coupled to described second mid point, described described second end of going up switch is coupled to described first end of described switch bridge, and described described first end of switch down is coupled to described second end of described switch bridge; And/or
Each described diode all has anode and negative electrode, the described anode of described first bypass diode is coupled to the described negative electrode and described first mid point of described second bypass diode, the described negative electrode of described first bypass diode is coupled to described first end of described rectifier bridge, and the described anode of described second bypass diode is coupled to described second end of described rectifier bridge.
13. circuit as claimed in claim 9, wherein said control switch is the IGBT with reverse parallel connection diode, described 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 described positive half cycle of described positive half cycle that is positioned at described DC mode and described AC mode, described control switch is switched on; And when the described negative half period of the described negative half period of described DC mode and described AC mode, described control switch is turned off, this moment, the described reverse parallel connection diode of described control switch was used to prevent the refluence of the electric current of described control switch, and bear revers voltage, make each described circuit of power factor correction can reach current-sharing each other.
14. a 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 described 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 described second end of described first inductance, and described second end of described first rectifier bridge is coupled to described negative pole;
The first switch bridge, it comprise be coupled to second mid point first on switch and first time switch, and have first end and second end, described first end of the wherein said first switch bridge is coupled to described first end of described first rectifier bridge, and described second end of the described first switch bridge is coupled to described second end of described first rectifier bridge;
First control switch, it has first end, second end and control end, and wherein said first end is coupled to described second mid point, and described second end is coupled to the described neutral line; And
First inverter, it receives described second direct voltage and described the 3rd direct voltage, and exports first alternating voltage.
15. circuit as claimed in claim 14 further comprises second power factor correcting step-up converter, wherein said second power factor correcting step-up converter is second power factor correcting step-up converter as claimed in claim 1.
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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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