CN102832688B - Uninterruptible power supply - Google Patents
Uninterruptible power supply Download PDFInfo
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- CN102832688B CN102832688B CN201110163827.0A CN201110163827A CN102832688B CN 102832688 B CN102832688 B CN 102832688B CN 201110163827 A CN201110163827 A CN 201110163827A CN 102832688 B CN102832688 B CN 102832688B
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Abstract
The invention discloses an uninterruptible power supply which comprises a subunit and a switch tube driving module, wherein the subunit comprises a first bridge arm formed by a first controllable switch and a second controllable switch, a second bridge arm formed by a third controllable switch and a fourth controllable switch, a third bridge arm formed by a fifth controllable switch and a sixth controllable switch, a first inductor, a bus capacitor, a second inductor, a second capacitor, a first switch and a second switch; the uninterruptible power supply also comprises a battery; a positive pole of the battery is coupled with a first end of the second switch, a second end of the second switch is coupled with a first end of the first inductor, and a negative pole of the battery is coupled with a negative pole of the bus capacitor; or the positive pole of the battery is coupled with a positive pole of the bus capacitor, the negative pole of the battery is coupled with the first end of the second switch, and the second end of the second switch is coupled with the first end of the first inductor. Due to the improvement in the hanging connection type of the battery, a circuit can work in a mode of the battery, and the control algorithm of the two controllable switches in the second bridge arm can be simplified.
Description
[technical field]
The present invention relates to power electronic device, particularly relate to a kind of uninterrupted power supply.
[background technology]
As shown in Figure 1, for existing uninterrupted power supply (Uninterruptible Power Supply, be called for short UPS) circuit diagram, in figure, UPS comprises subelement, the first brachium pontis that subelement comprises the first gate-controlled switch Q1, the second gate-controlled switch Q2 is connected to form, the second brachium pontis that 3rd gate-controlled switch Q3, the 4th gate-controlled switch Q4 are connected to form, the 3rd brachium pontis that 5th gate-controlled switch Q5, the 6th gate-controlled switch Q6 are connected to form, first inductance L 1, bus capacitor DC1, the second inductance L 2, second electric capacity C2, the first switch S 1 and second switch S2; The first end of the first switch S 1 is coupled with civil power input, second end of the first switch S 1 is coupled with the first end of the first inductance L 1, second end of the first inductance L 1 is coupled with the mid point of the first brachium pontis, first brachium pontis, the second brachium pontis and the 3rd brachium pontis are connected across positive pole and the negative pole of bus capacitor DC1 respectively, the mid point of the second brachium pontis is coupled to center line N, the mid point of the 3rd brachium pontis is coupled with the first end of the second inductance L 2, second end of the second inductance L 2 is coupled with the first end of the second electric capacity C2, and second end of the second electric capacity C2 is coupled to center line N.Also comprise battery BATTERY in UPS, the positive pole of battery BATTERY is coupled with the first end of the first inductance L 1 by second switch S2, and the negative pole of battery BATTERY is coupled with center line.
In above-mentioned UPS circuit, first inductance L 1, in the body of the first gate-controlled switch Q1, the second gate-controlled switch Q2, the 3rd gate-controlled switch Q3 diode and the 4th gate-controlled switch Q4 body in diode composition power factor correction (Power Factor Correction, be called for short PFC) circuit.3rd gate-controlled switch Q3, the 4th gate-controlled switch Q4, the 5th gate-controlled switch Q5, the 6th gate-controlled switch Q6 and the second inductance L 2, second electric capacity C2 form full bridge inverter.After the power factor correction of pfc circuit, its input current becomes with the input synchronous sine wave of civil power and harmonic content is less, pfc circuit makes AC/DC converter simultaneously, input civil power is converted to the direct voltage at bus capacitor DC1 two ends, and the direct voltage inversion at bus capacitor DC1 two ends is then that high-quality sinusoidal voltage is supplied to load by full bridge inverter.In circuit, the second brachium pontis formed due to the 3rd gate-controlled switch Q3, the 4th gate-controlled switch Q4 is shared by pfc circuit and full bridge inverter, and therefore employ less switching tube in circuit, the cost of circuit is lower.Simultaneously because the rectified current of pfc circuit is contrary with the direction of inverter current in most cases through the gate-controlled switch (Q3 or Q4) of the second brachium pontis of inverter circuit, major part can be offset, so the electric current flowed through in the 3rd gate-controlled switch Q3 and the 4th gate-controlled switch Q4 is little, loss power is thereon just little, and therefore the loss of circuit is also less.
But foregoing circuit, realize normal work, complicated control algolithm is needed to produce the drive singal of each gate-controlled switch to control the operating state of each gate-controlled switch, especially the 3rd gate-controlled switch Q3 of the second brachium pontis and the 4th gate-controlled switch Q4 in circuit, because the second brachium pontis of its composition is shared by pfc circuit and full bridge inverter, the drived control algorithm that two controlled Switch Controller are answered is more complicated.
In addition, existing UPS, except comprising above-mentioned subelement, also comprises switching tube driver module.As shown in Figure 2, for the circuit diagram of switching tube driver module, switching tube driver module comprises front-end filtering module 1, intermediate isolating coupling module 2 and rear end driver module 3, the switching tube drive control signal DRV1 of the input receiving key pipe driver module previous stage output of front-end filtering module 1, filtering process is carried out to it, first output terminals A of front-end filtering module 1 connects the first input end C of intermediate isolating coupling module 2, second output B of front-end filtering module 1, also namely earth terminal connects the second input D of intermediate isolating coupling module 2.First output F of intermediate isolating coupling module 2 connects the input I of rear end driver module 3, and the second output E connects the positive power line V+ of rear end driver module 3, and the 3rd output G connects the negative power line V-of rear end driver module 3.The drive singal output L of rear end driver module 3 connects the control end being positioned at the switching tube (as the second gate-controlled switch Q2, the 4th gate-controlled switch Q4 and the 6th gate-controlled switch Q6) of brachium pontis lower end in UPS subelement, the negative pole of the center line M connection bus electric capacity DC1 of rear end driver module 3.
How switch tube driver module improves, and to reduce the device cost of whole UPS, is also the direction that those skilled in the art make great efforts.
[summary of the invention]
Technical problem to be solved by this invention is: make up above-mentioned the deficiencies in the prior art, proposes a kind of uninterrupted power supply, the drived control algorithm that the 3rd gate-controlled switch Q3 in energy relative simplicity circuit in the second brachium pontis and the 4th gate-controlled switch Q4 is corresponding.
The further technical problem to be solved of the present invention is: make up above-mentioned the deficiencies in the prior art, propose a kind of uninterrupted power supply, by the improvement of switch tube driver module to reduce the device cost of whole UPS.
Technical problem of the present invention is solved by following technical scheme:
A kind of uninterrupted power supply, comprise subelement and switching tube driver module, described subelement comprises the first brachium pontis that the first gate-controlled switch and the second gate-controlled switch are connected to form, the second brachium pontis that 3rd gate-controlled switch and the 4th gate-controlled switch are connected to form, the 3rd brachium pontis that 5th gate-controlled switch and the 6th gate-controlled switch are connected to form, the first inductance, bus capacitor, second inductance, the second electric capacity, the first switch and second switch, the first end of described first switch is coupled with civil power input, second end of described first switch is coupled with the first end of described first inductance, second end of described first inductance is coupled with the mid point of described first brachium pontis, described first brachium pontis, second brachium pontis and the 3rd brachium pontis are connected across positive pole and the negative pole of described bus capacitor respectively, the mid point of described second brachium pontis is coupled to center line, the mid point of described 3rd brachium pontis is coupled with the first end of described second inductance, second end of described second inductance is coupled with the first end of described second electric capacity, second end of described second electric capacity is coupled to center line, it is characterized in that: described uninterrupted power supply also comprises battery, the positive pole of described battery is coupled with the first end of described second switch, and the second end of described second switch is coupled with the first end of described first inductance, the negative pole of described battery and the negative couplings of described bus capacitor, or the positive pole of described battery is coupled with the positive pole of described bus capacitor, the negative pole of described battery is coupled with the first end of described second switch, and the second end of described second switch is coupled with the first end of described first inductance.
In preferred technical scheme,
Described subelement also comprises the first electric capacity, and described first electric capacity first end is coupled with the positive pole of described battery, the negative couplings of the second end and described battery.
Further in preferred technical scheme,
Described subelement also comprises the 3rd inductance, and the mid point of described second brachium pontis is inductively coupled to center line by the described 3rd.
Described switching tube driver module comprises front-end filtering module and rear end driver module, first output of described front-end filtering module connects the input of described rear end driver module, the earth terminal of described front-end filtering module is directly connected with the center line of described rear end driver module, the negative couplings of the bus capacitor (DC1) in the center line of described rear end driver module and described subelement.
The beneficial effect that the present invention is compared with the prior art is:
Uninterrupted power supply of the present invention, by the improvement to battery mounting form, when circuit is worked under battery mode, two gate-controlled switch (Q3 in second brachium pontis, Q4) completely from " release " pfc circuit out, then when circuit is from when working utility mode switches to battery mode, no longer need change two gate-controlled switch (Q3, Q4) control algolithm is burnt to avoid it, gate-controlled switch (Q3 under battery mode, Q4) control algolithm still can adopt the control algolithm under utility mode, gate-controlled switch (Q3, Q4) both comprise control algolithm under utility mode during control algolithm is not existing for another example and also comprise control algolithm two parts content under battery mode, but be reduced to and only comprise this part content of control algolithm under utility mode.Moreover, due under battery mode, two gate-controlled switches (Q3, Q4) completely from " release " pfc circuit out, even if still distinguish the two-part control algolithm of design according to utility mode and battery mode, because under battery mode, two gate-controlled switches (Q3, Q4) only need the work of responsible inverter circuit, control algolithm in then corresponding under two gate-controlled switches (Q3, Q4) battery mode control algolithm hinge structure under battery mode also simplifies a lot, even if by designing two portions control algolithm, control algolithm entirety also can be simplified.Further, uninterrupted power supply of the present invention, the switching tube driver module in UPS, the earth terminal of front-end filtering module is connected altogether with the center line of rear end driver module, can save the use of intermediate isolating coupling module, reduces the device cost of whole UPS.
[accompanying drawing explanation]
Fig. 1 is the circuit diagram of uninterrupted power supply in prior art;
Fig. 2 is the switching tube driver module circuit diagram in prior art in uninterrupted power supply;
Fig. 3 is the circuit diagram of uninterrupted power supply in the specific embodiment of the invention one;
Fig. 4 a inputs current direction figure when positive half cycle exports positive half cycle in pfc circuit during the first inductive energy storage under uninterrupted power supply utility mode in the specific embodiment of the invention one;
Fig. 4 b to input when positive half cycle exports positive half cycle current direction figure when the first inductive energy storage in pfc circuit is transferred to bus capacitor under uninterrupted power supply utility mode in the specific embodiment of the invention one;
Fig. 4 c inputs current direction figure when inverter circuit median generatrix capacitance energy storage when positive half cycle exports positive half cycle is transferred to the second inductance under uninterrupted power supply utility mode in the specific embodiment of the invention one;
Fig. 4 d to input when positive half cycle exports positive half cycle current direction figure when the second inductive energy storage in inverter circuit is transferred to the second electric capacity under uninterrupted power supply utility mode in the specific embodiment of the invention one;
Fig. 5 a is current direction figure when inputting negative half period output negative half period in the specific embodiment of the invention one under uninterrupted power supply utility mode in pfc circuit during the first inductive energy storage;
Fig. 5 b is current direction figure when inputting under uninterrupted power supply utility mode in the specific embodiment of the invention one that when negative half period exports negative half period, in pfc circuit, the first inductive energy storage is transferred to bus capacitor;
Fig. 5 c inputs current direction figure when inverter circuit median generatrix capacitance energy storage when negative half period exports negative half period is transferred to the second inductance under uninterrupted power supply utility mode in the specific embodiment of the invention one;
Fig. 5 d is current direction figure when inputting under uninterrupted power supply utility mode in the specific embodiment of the invention one that when negative half period exports negative half period, in inverter circuit, the second inductive energy storage is transferred to the second electric capacity;
Current direction figure when Fig. 6 a is pfc circuit the first inductive energy storage in prior art under uninterrupted power supply battery mode;
Fig. 6 b is transferred to the current direction figure during bus capacitor when being pfc circuit the first inductive energy storage in prior art under uninterrupted power supply battery mode;
Current direction figure when Fig. 7 a is pfc circuit the first inductive energy storage in the specific embodiment of the invention one under uninterrupted power supply battery mode;
Fig. 7 b is pfc circuit first inductive energy storage in the specific embodiment of the invention one under uninterrupted power supply battery mode current direction figure when being transferred to bus capacitor;
Fig. 8 is the circuit diagram of uninterrupted power supply in the specific embodiment of the invention two;
Current direction figure when Fig. 9 a is pfc circuit the first inductive energy storage in the specific embodiment of the invention two under uninterrupted power supply battery mode;
Fig. 9 b is pfc circuit first inductive energy storage in the specific embodiment of the invention two under uninterrupted power supply battery mode current direction figure when being transferred to bus capacitor;
Figure 10 is the circuit diagram of uninterrupted power supply in the specific embodiment of the invention three;
Figure 11 is the circuit diagram of uninterrupted power supply in the specific embodiment of the invention four;
Figure 12 is the circuit diagram of uninterrupted power supply in the specific embodiment of the invention five;
Figure 13 is the circuit diagram of uninterrupted power supply in the specific embodiment of the invention six;
Figure 14 is the circuit diagram of uninterrupted power supply in the specific embodiment of the invention seven;
Figure 15 is the circuit diagram of uninterrupted power supply in the specific embodiment of the invention eight;
Figure 16 is the circuit diagram of uninterrupted power supply in the specific embodiment of the invention nine;
Figure 17 is the circuit diagram of uninterrupted power supply in the specific embodiment of the invention ten;
Figure 18 is the switching tube driver module circuit diagram in the specific embodiment of the invention 11 in uninterrupted power supply.
[embodiment]
Contrast accompanying drawing below in conjunction with embodiment the present invention is described in further details.
Embodiment one
As shown in Figure 3, be the circuit diagram of uninterrupted power supply in this embodiment, uninterrupted power supply comprises switching tube driver module (not shown), subelement 100 and battery BATTERY.Subelement 100 comprises the first brachium pontis that the first gate-controlled switch Q1 and the second gate-controlled switch Q2 is connected to form, the second brachium pontis that 3rd gate-controlled switch Q3 and the 4th gate-controlled switch Q4 is connected to form, the 3rd brachium pontis that 5th gate-controlled switch Q5 and the 6th gate-controlled switch Q6 is connected to form, first inductance L 1, bus capacitor DC1, second inductance L 2, second electric capacity C2, the first switch S 1 and second switch S2.In subelement 100, the first end of the first switch S 1 is coupled with civil power input, second end of the first switch S 1 is coupled with the first end of the first inductance L 1, second end of the first inductance L 1 is coupled with the mid point of the first brachium pontis, first brachium pontis, the second brachium pontis and the 3rd brachium pontis are connected across positive pole and the negative pole of bus capacitor DC1 respectively, the mid point of the second brachium pontis is coupled to center line N, the mid point of the 3rd brachium pontis is coupled with the first end of the second inductance L 2, second end of the second inductance L 2 is coupled with the first end of the second electric capacity C2, and second end of the second electric capacity C2 is coupled to center line N.The annexation of battery BATTERY and subelement is, the positive pole of battery BATTERY is coupled with the first end of second switch S2, and second end of second switch S2 is coupled with the first end of the first inductance L 1, the negative pole of battery BATTERY and the negative couplings of bus capacitor DC1.Relative to existing UPS circuit, the negative pole of battery BATTERY is no longer articulated on center line, but is directly connected on the negative pole of bus capacitor DC1.
Above-mentioned first gate-controlled switch Q1, the second gate-controlled switch Q2, the 3rd gate-controlled switch Q3, the 4th gate-controlled switch Q4, the 5th gate-controlled switch Q5 and the 6th gate-controlled switch Q6 are the gate-controlled switch of same type, the gate-controlled switch of described same type can be metal oxide semiconductor field effect tube, insulated gate bipolar transistor, power transistor, turn-off thyristor, MOS (Metal-Oxide-Semiconductor, Metal-oxide-semicondutor) control thyristor, static induction transistor, static induction thyristor or integrated gate commutated thyristor etc.
In above-mentioned subelement circuit, in the body of the first inductance L 1, first gate-controlled switch Q1, the second gate-controlled switch Q2, the 3rd gate-controlled switch Q3 diode and the 4th gate-controlled switch Q4 body in diode composition pfc circuit.3rd gate-controlled switch Q3, the 4th gate-controlled switch Q4, the 5th gate-controlled switch Q5, the 6th gate-controlled switch Q6 and the second inductance L 2, second electric capacity C2 form inverter circuit.Circuit structure and the operation principle of pfc circuit and inverter circuit are all identical with existing UPS, do not do repeat specification at this.
When foregoing circuit is as being operated under utility mode, the state of a control of each gate-controlled switch is identical with existing UPS, only does simple description as follows.
When civil power inputs positive half cycle, it is also positive half cycle that circuit exports, then pfc circuit is operated in positive half cycle, and inverter circuit is also operated in positive half cycle, then need to control: the first gate-controlled switch Q1 turns off; The pulse-width signal high frequency chopping that second gate-controlled switch Q2 produces according to PFC controlled quentity controlled variable and carrier wave; 3rd gate-controlled switch Q3 turns off; 4th gate-controlled switch Q4 conducting; The drive singal high frequency chopping that 5th gate-controlled switch Q5 produces according to inversion control amount and carrier wave, the 6th gate-controlled switch Q6 and the 5th gate-controlled switch Q5 complementary duty.In pfc circuit, during the first inductance L 1 energy storage, current circuit is as shown in dotted arrow in Fig. 4 a, in the first inductance L 1 stored energy transfer to current circuit during bus capacitor DC1 as shown in dotted arrow in Fig. 4 b; In inverter circuit, when in bus capacitor DC1, energy storage is released into the second inductance L 2, current circuit is as shown in dotted arrow in Fig. 4 c, and when in the second inductance L 2, energy storage is released into the second electric capacity C2, current circuit is as shown in dotted arrow in Fig. 4 d.
During civil power input negative half period, it is also negative half period that circuit exports, then pfc circuit is operated in negative half period, and inverter circuit is also operated in negative half period, then need to control: the pulse-width signal high frequency chopping that the first gate-controlled switch Q1 produces according to PFC controlled quentity controlled variable and carrier wave; Second gate-controlled switch Q2 turns off; 3rd gate-controlled switch Q3 conducting; 4th gate-controlled switch Q4 turns off; The drive singal high frequency chopping that 6th gate-controlled switch Q6 produces according to inversion control amount and carrier wave, the 5th gate-controlled switch Q5 and the 6th gate-controlled switch Q6 complementary duty.In pfc circuit, during the first inductance L 1 energy storage, current circuit is as shown in dotted arrow in Fig. 5 a, in the first inductance L 1 stored energy transfer to current circuit during bus capacitor DC1 as shown in dotted arrow in Fig. 5 b; In inverter circuit, when in bus capacitor DC1, energy storage is released into the second inductance L 2, current circuit is as shown in dotted arrow in Fig. 5 c, and when in the second inductance L 2, energy storage is released into the second electric capacity C2, current circuit is as shown in dotted arrow in Fig. 5 d.
Foregoing circuit is as under working in battery mode, and the work of each gate-controlled switch of inverter circuit part is still identical with inverter circuit in existing UPS, and in pfc circuit, the work of each gate-controlled switch is then different from pfc circuit in existing UPS.
In existing UPS circuit, under battery mode, in pfc circuit, current direction figure is as shown in Figure 6.Fig. 6 a is existing UPS current direction figure during the first inductance L 1 energy storage in pfc circuit under battery mode.Now, electric current, along battery BATTERY positive pole → second switch S2 → the first inductance L 1 → the second gate-controlled switch Q2 → the 4th gate-controlled switch Q4 → center line N → battery BATTERY negative pole, is the first inductance L 1 energy storage.Fig. 6 b is existing UPS current direction figure when the first inductance L 1 energy storage is released into bus capacitor DC1 in pfc circuit under battery mode.Now, electric current along battery BATTERY positive pole → second switch S2 → the first inductance L 1 → the first gate-controlled switch Q1 → bus capacitor DC1 → the 4th gate-controlled switch Q4 → center line N → battery BATTERY negative pole, for bus capacitor DC1 charges.
And in UPS circuit, under battery mode, in pfc circuit, current direction figure is as shown in Figure 7 in this embodiment.Be UPS circuit current direction figure during the first inductance L 1 energy storage in pfc circuit under battery mode in this embodiment in Fig. 7 a.Now, electric current, along battery BATTERY positive pole → second switch S2 → the first inductance L 1 → the second gate-controlled switch Q2 → battery BATTERY negative pole, is the first inductance L 1 energy storage.Be current direction figure when the first inductance L 1 energy storage in pfc circuit under battery mode is released into bus capacitor DC1 in Fig. 7 b.Now, electric current along battery BATTERY positive pole → second switch S2 → the first inductance L 1 → the first gate-controlled switch Q1 → bus capacitor DC1 → battery BATTERY negative pole, for bus capacitor DC1 charges.
Current circuit in comparison diagram 6 and Fig. 7 is known, when UPS in this embodiment is under battery mode, the participation of two gate-controlled switches (Q3, Q4) in the second brachium pontis is no longer needed in pfc circuit, two gate-controlled switches (Q3, Q4) only need the task born in inverter circuit, like this can drived control algorithm corresponding to relative simplicity the 3rd gate-controlled switch Q3 and the 4th gate-controlled switch Q4.Concrete analysis is:
3rd gate-controlled switch Q3 in existing UPS circuit and the very complicated reason of the 4th gate-controlled switch Q4 control algolithm are analyzed, on the one hand, the second brachium pontis formed due to the 3rd gate-controlled switch Q3, the 4th gate-controlled switch Q4 is shared by pfc circuit and full bridge inverter, two gate-controlled switches are made all " to hold " two duties, to power or directly battery-powered being input as the positive half cycle of civil power, when exporting half cycle positive for inversion, need the 4th gate-controlled switch Q4 takes into account the work in pfc circuit and inverter circuit simultaneously; To power or directly battery-powered being input as civil power negative half period, when exporting as inversion negative half period, need the 3rd gate-controlled switch Q3 to take into account the work of pfc circuit and inverter circuit simultaneously.Therefore, because the 3rd gate-controlled switch Q3, the 4th gate-controlled switch Q4 " hold " " dual identity " of two duties, the control algolithm content that two gate-controlled switches (Q3, Q4) are corresponding is more complicated relative to other gate-controlled switch (Q1, Q2, Q3 and Q4).On the other hand, when needs by circuit from when working utility mode switches to battery mode, burn for avoiding the long-time conducting of the 3rd gate-controlled switch Q3 and the 4th gate-controlled switch Q4, need reset the drived control algorithm of the correspondence of the 3rd gate-controlled switch Q3 and the 4th gate-controlled switch Q4, also namely the control algolithm of the 3rd gate-controlled switch Q3 and the 4th gate-controlled switch Q4 comprises two parts, work during the corresponding utility mode of a part, work during another part correspondence battery mode.Therefore, the control algolithm content of the content of the 3rd gate-controlled switch Q3 and the 4th gate-controlled switch Q4 control algolithm also other gate-controlled switch relative is more.In sum, the control algolithm of the 3rd gate-controlled switch Q3, the 4th gate-controlled switch Q4 is complicated, and comprises two parts content and cause its control algolithm comparatively complicated.By the change of battery mounting form in this embodiment, when making UPS under battery mode, the participation of two gate-controlled switches (Q3, Q4) in the second brachium pontis is no longer needed in pfc circuit, two gate-controlled switches (Q3, Q4) only need the task born in inverter circuit, then control algolithm complexity reduces relatively.Simultaneously, because pfc circuit during battery mode does not relate to the 3rd gate-controlled switch Q3 and the 4th gate-controlled switch Q4, need not for avoiding the long-time conducting of the 3rd gate-controlled switch Q3 and the 4th gate-controlled switch Q4 to burn and resetting control algolithm under such battery mode, still can continue to use the control algolithm under utility mode under battery mode, the content of control algolithm is also reduced relatively.Namely by the change of battery mounting form, and then from drived control algorithm corresponding to algorithm complex and algorithm content aspect relative simplicity the 3rd gate-controlled switch Q3 and the 4th gate-controlled switch Q4.
Embodiment two
As shown in Figure 8, this embodiment is with the difference of execution mode one: the positive pole of battery BATTERY is coupled with the positive pole of bus capacitor DC1, the negative pole of battery BATTERY is coupled with the first end of second switch S2, and second end of second switch S2 is coupled with the first end of the first inductance L 1.The battery mounting of this kind of form, equally also can realize the object of drived control algorithm corresponding to simplification the 3rd gate-controlled switch Q3 and the 4th gate-controlled switch Q4.
As shown in Figure 8, be the circuit diagram of uninterrupted power supply in this embodiment, comprise subelement 100 and battery BATTERY.Subelement 100 comprises the first brachium pontis that the first gate-controlled switch Q1 and the second gate-controlled switch Q2 is connected to form, the second brachium pontis that 3rd gate-controlled switch Q3 and the 4th gate-controlled switch Q4 is connected to form, the 3rd brachium pontis that 5th gate-controlled switch Q5 and the 6th gate-controlled switch Q6 is connected to form, first inductance L 1, bus capacitor DC1, second inductance L 2, second electric capacity C2, the first switch S 1 and second switch S2.In subelement 100, the first end of the first switch S 1 is coupled with civil power input, second end of the first switch S 1 is coupled with the first end of the first inductance L 1, second end of the first inductance L 1 is coupled with the mid point of the first brachium pontis, first brachium pontis, the second brachium pontis and the 3rd brachium pontis are connected across positive pole and the negative pole of bus capacitor DC1 respectively, the mid point of the second brachium pontis is coupled to center line N, the mid point of the 3rd brachium pontis is coupled with the first end of the second inductance L 2, second end of the second inductance L 2 is coupled with the first end of the second electric capacity C2, and second end of the second electric capacity C2 is coupled to center line N.The annexation of battery BATTERY and subelement is, the positive pole of battery BATTERY is coupled with the positive pole of bus capacitor DC1, and the negative pole of battery BATTERY is coupled with the first end of second switch S2, and second end of second switch S2 is coupled with the first end of the first inductance L 1.
In this embodiment, in UPS circuit, under battery mode, in pfc circuit, current direction figure is as shown in Figure 9.Be UPS circuit current direction figure during the first inductance L 1 energy storage in pfc circuit under battery mode in this embodiment in Fig. 9 a.Now, electric current, along battery BATTERY positive pole → the first gate-controlled switch Q1 → the first inductance L 1 → second switch S2 → battery BATTERY negative pole, is the → inductance L 1 energy storage.Be current direction figure when the first inductance L 1 energy storage in pfc circuit under battery mode is released into bus capacitor DC1 in Fig. 9 b.Now, electric current along battery BATTERY positive pole → bus capacitor DC1 → the second gate-controlled switch Q2 → the first inductance L 1 → second switch S2 → battery BATTERY negative pole, for bus capacitor DC1 charges.
From the current direction figure shown in Fig. 9, under this battery mounting form known, when UPS is under battery mode, the participation of two gate-controlled switches (Q3, Q4) in the second brachium pontis is not needed equally in pfc circuit, two gate-controlled switches (Q3, Q4) only need the task born in inverter circuit, so also can with in execution mode one, the drived control algorithm that relative simplicity the 3rd gate-controlled switch Q3 and the 4th gate-controlled switch Q4 is corresponding.
Embodiment three
As shown in Figure 10, this embodiment is with the difference of execution mode one: subelement also comprises the first electric capacity C1, and the first end of the first electric capacity C1 is coupled with the positive pole of battery BATTERY, the negative couplings of the second end and battery BATTERY.
In this embodiment, connect the first electric capacity C1 in the manner described above, can effectively avoid capacitance positions to place the total harmonic distortion (Total Harmonic Distortion of Current is called for short THDi) of the improper UPS input current caused.This is because common electric capacity connection is, the first connection: be connected with the first inductance L 1 first end by the first electric capacity C1 first end, the second end is connected with center line N; Or slightly make improvements and obtain the second connection, be connected with the first inductance L 1 first end by the first electric capacity C1 first end, the second end is connected with bus capacitor negative pole.In above-mentioned two kinds of usual connections, capacitance positions all exists and is improperly easy to cause the THDi index of UPS to be deteriorated.
After accessing the first electric capacity C1 according to the first connection, under battery mode, easily open at the 3rd gate-controlled switch Q3 and form a loop instantaneously, this loop is: bus capacitor DC1 positive pole → the 3rd gate-controlled switch Q3 → center line N → the first electric capacity C1 → second switch S2 → battery BATTERY positive pole → battery BATTERY negative pole → bus capacitor DC1 negative pole.
After accessing the first electric capacity C1 according to the first connection, under battery mode, also easy opening at the 4th gate-controlled switch Q4 forms a loop instantaneously, and this loop is: battery BATTERY positive pole → second switch S2 → the first electric capacity C1 → center line N → the 4th gate-controlled switch Q4 → battery BATTERY negative pole.
After the second connection access the → electric capacity C1, under utility mode, civil power input is from when just half week is to negative half period zero passage, also easy opening at the 3rd gate-controlled switch Q3 forms a loop instantaneously, and this loop is: mains electricity input end → the first electric capacity C1 → bus capacitor DC1 negative pole → bus capacitor DC1 positive pole → the 3rd gate-controlled switch Q3 → center line N.
After accessing the first electric capacity C1 according to the second connection, under utility mode, when civil power input is from negative half period to positive half cycle zero passage, also easy opening at the 4th gate-controlled switch Q4 forms a loop instantaneously.This loop is: center line N → the 4th gate-controlled switch Q4 → the first electric capacity C1 → mains electricity input end.Meanwhile, be now also easy to open at the second gate-controlled switch Q2 form a loop instantaneously, this loop is: the first electric capacity C1 → the first inductance L 1 → the second gate-controlled switch Q2 → the first electric capacity C1.
Form electric current in the loop formed under said circumstances, namely this formation electric current causes the input current waveform of UPS to distort, and causes the THDi index of UPS to be deteriorated.And after accessing the first electric capacity C1 according to the mode in this embodiment, the connection of the first electric capacity C1 cannot form above-mentioned loop, therefore can avoid the formation of electric current and cause the THDi index of UPS to be deteriorated.Although the first electric capacity C1 connection improved in this embodiment and the distinctive points of usual connection less, the technology prejudice of those skilled in the art can be overcome.
Embodiment four
As shown in figure 11, this embodiment is with the difference of execution mode two: subelement also comprises the first electric capacity C1, and the first end of the first electric capacity C1 is coupled with the positive pole of battery BATTERY, the negative couplings of the second end and battery BATTERY.Connect on the basis of battery in embodiment two, then connect the first electric capacity C1 in the manner described above, the first electric capacity C1 can be avoided equally to connect improper formation loop formation electric current and cause the THDi index of UPS to be deteriorated.
Embodiment five
As shown in figure 12, this embodiment is with the difference of execution mode one: the mid point that subelement also comprises the 3rd inductance L 3, second brachium pontis is coupled to center line N by the 3rd inductance L 3.By setting up the 3rd inductance L 3, the coupling of UPS importation and output can be reduced.
Embodiment six
As shown in figure 13, this embodiment is with the difference of execution mode two: the mid point that subelement also comprises the 3rd inductance L 3, second brachium pontis is coupled to center line N by the 3rd inductance L 3.By setting up the 3rd inductance L 3, the coupling of UPS importation and output can be reduced.
Embodiment seven
As an embodiment, as shown in figure 14, this embodiment is with the difference of execution mode one: subelement also comprises the 3rd switch S 3, the positive pole of battery BATTERY is coupled with the first end of second switch S2, second end of second switch S2 is coupled with the first end of the first inductance L 1, and the negative pole of battery BATTERY is by the negative couplings of the 3rd switch S 3 with bus capacitor DC1.
Embodiment eight
As an embodiment, as shown in figure 15, this embodiment is with the difference of execution mode two: subelement also comprises the 3rd switch S 3, the positive pole of battery BATTERY is coupled with the positive pole of bus capacitor DC1 by the 3rd switch S 3, the negative pole of battery BATTERY is coupled with the first end of second switch S2, and second end of second switch S2 is coupled with the first end of the first inductance L 1.
Embodiment nine
As shown in figure 16, this embodiment is with the difference of execution mode one: comprise three subelements, be respectively the first subelement 100, second subelement the 200, three subelement 300.The structure of each subelement is with the subelement in embodiment one.Wherein, the positive pole of battery BATTERY is coupled respectively with the first end of the second switch S12 in the second switch S2 in the first subelement 100, the second subelement 200, the second switch S22 in the 3rd subelement 300, and the negative pole of battery BATTERY is coupled respectively with the negative pole of the bus capacitor DC11 in the bus capacitor DC1 in the first subelement 100, the second subelement 200, the bus capacitor DC21 in the 3rd subelement 300.The UPS that UPS in this embodiment is in 3 execution modes one is connected in parallel, and realizes the application of 3 public battery BATTERY of subelement parallel operation, reduces system cost, can obtain the power output of 3 times simultaneously.
Embodiment ten
As shown in figure 17, this embodiment is with the difference of execution mode one: comprise three subelements, be respectively the first subelement 100, second subelement the 200, three subelement 300.The structure of each subelement is with the subelement in embodiment two.Wherein, the positive pole of battery BATTERY is coupled respectively with the positive pole of the bus capacitor DC11 in the bus capacitor DC1 in the first subelement 100, the second subelement 200, the bus capacitor DC21 in the 3rd subelement 300, and the negative pole of battery BATTERY is coupled respectively with the first end of the second switch S12 in the second switch S2 in the first subelement 100, the second subelement 200, the second switch S22 in the 3rd subelement 300.The UPS that UPS in this embodiment is in 3 execution modes two is connected in parallel, and realizes the application of 3 public battery BATTERY of subelement parallel operation, reduces system cost, can obtain the power output of 3 times simultaneously.
Embodiment 11
UPS in this embodiment makes improvements for switching tube driver module.As shown in figure 18, be the circuit diagram of the switching tube driver module in the UPS in this embodiment.Switching tube driver module comprises front-end filtering module 1 and rear end driver module 3, first output terminals A of front-end filtering module 1 connects the input I of rear end driver module 3, second output B of front-end filtering module 1, also be earth terminal, after being directly connected with the center line M of end driver module 3, be connected to the negative pole of the bus capacitor DC1 in UPS subelement.Also be, the earth terminal of front-end filtering module 1 and the center line M of rear end driver module 3 altogether (negative pole of common bus electric capacity DC1 is as ground end) are connected, therefore can save the use of intermediate isolating coupling module in the switching tube driver module in this embodiment relative to switching tube driver module of the prior art, reduce the device cost of whole UPS.The switching tube driver module in three these embodiments is used to drive the switching tube being positioned at brachium pontis lower end in UPS subelement respectively, i.e. the second gate-controlled switch Q2, the 4th gate-controlled switch Q4 and the 6th gate-controlled switch Q6, the use of 3 isolation coupling modules can be saved, realize low cost.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, make some substituting or obvious modification without departing from the inventive concept of the premise, and performance or purposes identical, all should be considered as belonging to protection scope of the present invention.
Claims (8)
1. a uninterrupted power supply, comprise subelement and switching tube driver module, described subelement comprises the first brachium pontis that the first gate-controlled switch (Q1) and the second gate-controlled switch (Q2) are connected to form, the second brachium pontis that 3rd gate-controlled switch (Q3) and the 4th gate-controlled switch (Q4) are connected to form, the 3rd brachium pontis that 5th gate-controlled switch (Q5) and the 6th gate-controlled switch (Q6) are connected to form, first inductance (L1), bus capacitor (DC1), second inductance (L2), second electric capacity (C2), first switch (S1) and second switch (S2), the first end of described first switch (S1) is coupled with civil power input, second end of described first switch (S1) is coupled with the first end of described first inductance (L1), second end of described first inductance (L1) is coupled with the mid point of described first brachium pontis, described first brachium pontis, second brachium pontis and the 3rd brachium pontis are connected across positive pole and the negative pole of described bus capacitor (DC1) respectively, the mid point of described second brachium pontis is coupled to center line (N), the mid point of described 3rd brachium pontis is coupled with the first end of described second inductance (L2), second end of described second inductance (L2) is coupled with the first end of described second electric capacity (C2), second end of described second electric capacity (C2) is coupled to center line (N), it is characterized in that: described uninterrupted power supply also comprises battery,
The positive pole of described battery is coupled with the first end of described second switch (S2), second end of described second switch (S2) is coupled with the first end of described first inductance (L1), the negative pole of described battery and the negative couplings of described bus capacitor (DC1);
Or,
The positive pole of described battery is coupled with the positive pole of described bus capacitor (DC1), the negative pole of described battery is coupled with the first end of described second switch (S2), and the second end of described second switch (S2) is coupled with the first end of described first inductance (L1);
Described subelement also comprises the first electric capacity (C1), and described first electric capacity (C1) first end is directly connected with the positive pole of described battery, the second end is directly connected with the negative pole of described battery.
2. uninterrupted power supply according to claim 1, is characterized in that: described subelement also comprises the 3rd inductance (L3), and the mid point of described second brachium pontis is coupled to center line (N) by described 3rd inductance (L3).
3. uninterrupted power supply according to claim 1, it is characterized in that: described subelement also comprises the 3rd switch (S3), when the positive pole of described battery is coupled with the first end of described second switch (S2), when second end of described second switch (S2) is coupled with the first end of described first inductance (L1)
The negative pole of described battery is by the negative couplings of described 3rd switch (S3) with described bus capacitor (DC1).
4. uninterrupted power supply according to claim 1, it is characterized in that: described subelement also comprises the 3rd switch (S3), when the negative pole of described battery is coupled with the first end of described second switch (S2), when second end of described second switch (S2) is coupled with the first end of described first inductance (L1)
The positive pole of described battery is coupled with the positive pole of described bus capacitor (DC1) by described 3rd switch (S3).
5. uninterrupted power supply according to claim 1, it is characterized in that: described first gate-controlled switch (Q1), second gate-controlled switch (Q2), 3rd gate-controlled switch (Q3), 4th gate-controlled switch (Q4), the gate-controlled switch that 5th gate-controlled switch (Q5) and the 6th gate-controlled switch (Q6) are same type, the gate-controlled switch of described same type is metal oxide semiconductor field effect tube, insulated gate bipolar transistor, power transistor, turn-off thyristor, MOS controls thyristor, static induction transistor, static induction thyristor or integrated gate commutated thyristor.
6. uninterrupted power supply according to claim 1, it is characterized in that: described uninterrupted power supply comprises at least two described subelements, the positive pole of described battery is coupled respectively with the first end of the second switch (S2) of each subelement, and the negative pole of described battery is coupled respectively with the negative pole of the bus capacitor (DC1) of each subelement.
7. uninterrupted power supply according to claim 1, it is characterized in that: described uninterrupted power supply comprises at least two described subelements, the positive pole of described battery is coupled respectively with the positive pole of the bus capacitor (DC1) of each subelement, and the negative pole of described battery is coupled respectively with the first end of the second switch (S2) of each subelement.
8. uninterrupted power supply according to claim 1, it is characterized in that: described switching tube driver module comprises front-end filtering module and rear end driver module, first output of described front-end filtering module connects the input of described rear end driver module, the earth terminal of described front-end filtering module is directly connected with the center line of described rear end driver module, the negative couplings of the bus capacitor (DC1) in the center line of described rear end driver module and described subelement.
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| EP3503366A1 (en) * | 2017-12-25 | 2019-06-26 | Delta Electronics, Inc. | Uninterruptible power supply apparatus |
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| CN106100087B (en) * | 2016-08-17 | 2018-10-19 | 漳州科华技术有限责任公司 | A kind of charging circuit and its control method |
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| CN106877713B (en) * | 2017-03-30 | 2019-05-17 | 上海交通大学 | A kind of accumulation energy type converter topology with fault ride-through capacity |
| CN109962474B (en) * | 2017-12-25 | 2024-01-23 | 台达电子工业股份有限公司 | Uninterruptible power supply device |
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| CN111478408A (en) * | 2020-05-22 | 2020-07-31 | 广州视源电子科技股份有限公司 | Three-bridge-arm topology device, control method and uninterruptible power supply system |
| CN212210538U (en) * | 2020-05-22 | 2020-12-22 | 广州视源电子科技股份有限公司 | Three-bridge-arm topology device and uninterruptible power supply system |
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