CN107482764B - Uninterrupted power source's structure - Google Patents
Uninterrupted power source's structure Download PDFInfo
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- CN107482764B CN107482764B CN201710945124.0A CN201710945124A CN107482764B CN 107482764 B CN107482764 B CN 107482764B CN 201710945124 A CN201710945124 A CN 201710945124A CN 107482764 B CN107482764 B CN 107482764B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
Abstract
The invention discloses a structure of an uninterruptible power supply, which comprises: the invention relates to a three-phase bridge type full-control rectifier, a first BOOST converter, a second BOOST converter, a three-phase voltage inverter, a storage battery and a BUCK voltage reducer, wherein the input end of the BUCK voltage reducer is connected with the output end of the first BOOST converter through a BUCK circuit breaker, a comparison branch is arranged between the control end of the BUCK circuit breaker and the three-phase bridge type full-control rectifier. The circuit design can be widely applied to uninterruptible power supplies.
Description
Technical Field
The invention relates to the field of power electronics, in particular to a power supply.
Background
In enterprises, most of electric equipment needs continuous electric power to drive, and particularly, sudden power failure in the production process can obstruct the development progress of production; the real-time data of the computer cannot be effectively stored in production, and certain adverse effects are caused to factories. In particular, some machines may have an immeasurable impact on the machine when the machine is shut down without going through normal procedures. For this situation, an uninterruptible power supply has emerged, and existing uninterruptible power supplies include: the three-phase bridge type full-control rectifier, first, second BOOST converter, three-phase voltage inverter, battery, BUCK converter, the output of three-phase bridge type full-control rectifier respectively with BUCK converter's input with first BOOST converter's input is connected, BUCK converter's output with the input of battery is connected, the output of battery passes through second BOOST converter with three-phase voltage inverter's input is connected, first BOOST converter's output with three-phase voltage inverter's input is connected, when the commercial power has the electricity, three-phase bridge type full-control rectifier will three-phase alternating current is converted into direct current, direct current is stepped up through first BOOST converter, and the voltage after the BOOST is passed through three-phase voltage inverter and is contravariant into three-phase alternating current and output for the load, and the voltage after the BOOST is passed through BUCK converter charges the battery, when the commercial power is not had the BOOST, the battery passes through second BOOST converter and is passed through three-phase voltage inverter and output for the load uninterrupted power supply. The stability of the existing uninterruptible power supply to the power grid needs to be required to a certain extent, when the phase voltage of the power grid is too high and unstable, the inverted alternating current can be unstable, and therefore the power supply of a load is affected.
Disclosure of Invention
The invention aims to solve the problem that the existing uninterruptible power supply is easy to generate unstable output due to unstable power grid.
The invention solves the technical problems as follows: a structure of an uninterruptible power supply, comprising: the three-phase bridge type full-control rectifier, first, second BOOST converter, three-phase voltage inverter, battery, BUCK converter, the output of three-phase bridge type full-control rectifier with the input of first BOOST converter is connected, BUCK converter's output with the input of battery is connected, the output of battery through second BOOST converter with the input of three-phase voltage inverter is connected, first BOOST converter's output with the input of three-phase voltage inverter is connected, BUCK converter's input through step-down circuit breaker with the output of first BOOST converter is connected, step-down circuit breaker's control end with be equipped with the comparison branch road between the full-control rectifier of three-phase bridge type, the comparison branch road includes: the voltage measuring module is connected with the output end of the three-phase bridge type full-control rectifier, the output end of the voltage measuring module is connected with the in-phase input end of the comparator, the output end of the comparator is connected with the control end of the step-down circuit breaker, and the comparison branch circuit is used for controlling the on-off of the step-down circuit breaker according to the output voltage of the three-phase bridge type full-control rectifier.
Further, the invention also includes: the input end of the hysteresis controller is connected with the output end of the three-phase voltage inverter, and the output end of the hysteresis controller is connected with the control end of the switching tube of the second BOOST.
Further, the three-phase bridge type full-control rectifier includes: the three-phase bridge type PWM rectifier comprises an inductor, a three-phase bridge type PWM rectifier, a synchronous six-pulse generator and a phase-locked loop, wherein the inductor is connected with the input end of the three-phase bridge type PWM rectifier in series, the output end of the phase-locked loop is connected with the input end of the synchronous six-pulse generator, the output end of the synchronous six-pulse generator is connected with a control port of the three-phase bridge type PWM rectifier, the inductor is used for pumping up mains voltage and filtering mains harmonic waves, the phase-locked loop is used for locking three-phase voltage waveforms of mains supply in phase, and the synchronous six-pulse generator is used for outputting PWM waves.
Further, the inductance value of the inductor is 0.000076H.
The beneficial effects of the invention are as follows: the invention uses the comparison branch to collect and judge the voltage at the output end of the three-phase bridge type full-control rectifier, controls the voltage-reducing circuit-breaking switch to control the opening and closing of the charging loop, and stabilizes the over-high voltage by charging the storage battery, thereby avoiding the unstable output condition caused by the unstable power grid. The circuit design can be widely applied to uninterruptible power supplies.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is evident that the drawings described are only some embodiments of the invention, but not all embodiments, and that other designs and drawings can be obtained from these drawings by a person skilled in the art without inventive effort.
FIG. 1 is a schematic diagram of a circuit topology created by the present invention;
fig. 2 is a schematic circuit topology of a three-phase bridge type fully controlled rectifier.
Detailed Description
The conception, specific structure, and technical effects produced by the present invention will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present invention. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention. In addition, all coupling/connection relationships mentioned herein do not refer to direct connection of the components, but rather, refer to the fact that a more optimal coupling structure may be formed by adding or subtracting coupling aids depending on the particular implementation. The technical features in the invention can be interactively combined on the premise of no contradiction and conflict.
Embodiment 1, referring to fig. 1 and 2, a structure of an uninterruptible power supply includes: the three-phase bridge type full-control rectifier 3, first and second BOOST converters 41 and 42, a three-phase voltage inverter 6, a storage battery 7 and a BUCK converter 5, wherein a positive output end OUT+ of the three-phase bridge type full-control rectifier 3 is connected with a positive input end V+ of the first BOOST converter 41, a negative output end OUT+ of the three-phase bridge type full-control rectifier 3 is connected with a negative input end V+ of the first BOOST converter 41, an output end of the BUCK converter 5 is connected with an input end of the storage battery 7, an output end of the storage battery 7 is connected with an input end of the three-phase voltage inverter 6 through the second BOOST converter 42, an output end OUT+, OUT+ of the first BOOST converter 41 is connected with an input end V+ of the three-phase voltage inverter 6, an input end V+ of the BUCK converter 5 is connected with an output end OUT+ of the first BOOST converter through a step-down circuit breaker K, a control end of the BUCK switch K is connected with an input end OUT+ of the three-phase BOOST converter 7, and the output end OUT+ of the BUCK converter 5 is provided with a full-control branch circuit 1+ and comprises a comparison circuit 1-3: the voltage measuring device comprises a voltage measuring module 13 and a comparator 11, wherein the input end of the voltage measuring module 13 is connected with the output end OUT+ and OUT-of the three-phase bridge type full-control rectifier 3, the output end of the voltage measuring module 13 is connected with the non-inverting input end of the comparator 11, the inverting input end of the comparator 11 is connected with a reference voltage module 12, the reference voltage output by the reference voltage module 12 is 300V, and the output end of the comparator 11 is connected with the control end of the step-down breaking switch K.
When the input ends a, b, c of the three-phase bridge type full-control rectifier 3 are respectively connected with a three-phase ac mains supply, the voltage measurement module 13 always detects the voltage of the output end out+ of the three-phase bridge type full-control rectifier 3, denoted as V1, the voltage V1 is boosted by the first BOOST 41 to obtain a voltage V2, and the voltage V2 is inverted into a voltage V3 by the three-phase voltage inverter 6.
When the commercial power is unstable and thus the rectified voltage V1 is abnormal, the embodiment refers to that the voltage V1 is higher than 300V, the voltage measurement module 13 measures the voltage V1 and outputs the voltage to the in-phase input end of the comparator 11, the comparator 11 outputs a high level to the control end of the BUCK break switch K, the BUCK break switch K is closed, the input end of the BUCK step-down device 5 is communicated with the output end of the first BOOST step-up device 41, the BUCK break switch K, BUCK step-down device 5 and the storage battery 7 form a charging loop, the voltage V2 is pulled down by charging the storage battery 7, or an external load can be understood to be increased, and under the condition that the total power is unchanged, part of power is split, so that the pulling down of the voltage V2 is realized, the input voltage stability of the three-phase voltage inverter 6 is ensured, and finally the stable output voltage of the three-phase voltage inverter 6 is ensured to the load end.
The invention utilizes the comparison branch 1 to collect and judge the voltage at the output end of the three-phase bridge type full-control rectifier 3, controls the voltage-reducing circuit-breaking switch K to control the opening and closing of the charging loop, and utilizes the mode of charging the storage battery 7 to pull down the over-high voltage, thereby avoiding the condition of unstable output caused by unstable power grid. The circuit design can be widely applied to uninterruptible power supplies.
As an optimization, the design of the uninterruptible power supply further comprises: the input end in of the hysteresis controller 8 is connected with the output end of the three-phase voltage inverter 6, and the output end in of the hysteresis controller 8 is connected with the control end g of the switching tube of the second BOOST converter 42. The hysteresis controller 8, the second BOOST booster 42 and the storage battery 7 form a hysteresis control loop 2, when the voltage on the load is too low, namely, the voltage V3 is too low, the hysteresis controller 8 outputs high-low level to control the switching tube of the second BOOST booster 42, the second BOOST booster 42 BOOSTs the voltage of the storage battery 7 into the input end of the three-phase voltage inverter 6, so that the voltage V3 is raised, and finally, the purpose of stabilizing the load voltage is achieved.
As an optimization, the three-phase bridge type full-control rectifier 3 includes: the three-phase bridge type PWM rectifier 36, inductance LA, LB, LC, three-phase bridge type PWM rectifier 36, synchronous six pulse generator 37, phase-locked loop 35, inductance LA, LB, LC respectively with the A, B, C input of three-phase bridge type PWM rectifier 36 concatenates, phase-locked loop 35's output wt with synchronous six pulse generator 37's input wt is connected, synchronous six pulse generator's output P with three-phase bridge type PWM rectifier 36's control port g is connected, voltage measurement module 32, 33, 34 respectively with three-phase bridge type full-control rectifier 3 input port a, b, c is connected for measuring the voltage signal of commercial power A, B, C phase, and export these voltage signal to phase-locked loop 35's output abc through bus module 31, phase-locked loop 35 goes to synchronous six pulse generator 37 through output wt after unifying the phase to three different phase voltage signal, through synchronous six pulse generator 37 exports PWM ripples, this PWM ripples input to three-phase bridge type PWM rectifier 36 to control three-phase bridge type PWM rectifier 36's 3 input port a, and switching tube (6 switching tube) is simple, and the realization cost is reduced, the current rectifier device is realized to the maintenance, the cost is easy and the device is realized to the following the realization.
As an optimization, the inductance value of the inductors LA, LB and LC is 0.000076H, and it is unexpectedly found that the circuit structure has good electromagnetic compatibility when the inductance value of the inductors LA, LB and LC is 0.000076H.
While the preferred embodiments of the present invention have been illustrated and described, the present invention is not limited to the embodiments, and various equivalent modifications and substitutions can be made by one skilled in the art without departing from the spirit of the present invention, and these are intended to be included within the scope of the present invention as defined in the appended claims.
Claims (4)
1. A structure of an uninterruptible power supply, comprising: the three-phase bridge type full-control rectifier, first, second BOOST converter, three-phase voltage inverter, battery, BUCK converter, the output of three-phase bridge type full-control rectifier with the input of first BOOST converter is connected, the output of BUCK converter with the input of battery is connected, the output of battery pass through the second BOOST converter with the input of three-phase voltage inverter is connected, the output of first BOOST converter with the input of three-phase voltage inverter is connected, its characterized in that: the input end of the BUCK step-down device is connected with the output end of the first BOOST step-up device through a step-down circuit breaker, a comparison branch circuit is arranged between the control end of the step-down circuit breaker and the three-phase bridge type full-control rectifier, and the comparison branch circuit comprises: the voltage measuring module is connected with the output end of the three-phase bridge type full-control rectifier, the output end of the voltage measuring module is connected with the in-phase input end of the comparator, the output end of the comparator is connected with the control end of the step-down circuit breaker, and the comparison branch circuit is used for controlling the on-off of the step-down circuit breaker according to the output voltage of the three-phase bridge type full-control rectifier.
2. The structure of an uninterruptible power supply according to claim 1, further comprising: the input end of the hysteresis controller is connected with the output end of the three-phase voltage inverter, and the output end of the hysteresis controller is connected with the control end of the switching tube of the second BOOST.
3. The structure of an uninterruptible power supply according to claim 1 or 2, wherein the three-phase bridge type full-control rectifier includes: the three-phase bridge type PWM rectifier comprises an inductor, a three-phase bridge type PWM rectifier, a synchronous six-pulse generator and a phase-locked loop, wherein the inductor is connected with the input end of the three-phase bridge type PWM rectifier in series, the output end of the phase-locked loop is connected with the input end of the synchronous six-pulse generator, the output end of the synchronous six-pulse generator is connected with a control port of the three-phase bridge type PWM rectifier, the inductor is used for pumping up mains voltage and filtering mains harmonic waves, the phase-locked loop is used for locking three-phase voltage waveforms of mains supply in phase, and the synchronous six-pulse generator is used for outputting PWM waves.
4. A structure of an uninterruptible power supply according to claim 3, wherein the inductance of the inductor is 0.000076H.
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| CN201710945124.0A CN107482764B (en) | 2017-10-12 | 2017-10-12 | Uninterrupted power source's structure |
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| CN201710945124.0A CN107482764B (en) | 2017-10-12 | 2017-10-12 | Uninterrupted power source's structure |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101521392A (en) * | 2008-02-28 | 2009-09-02 | 德观电子(上海)有限公司 | Off-line uninterrupted power supply device |
| CN201937311U (en) * | 2011-02-25 | 2011-08-17 | 天津福海银洋能源科技开发有限公司 | Full-automatic uniterruptable power output (UPS) |
| CN102222965A (en) * | 2011-06-29 | 2011-10-19 | 黄俊嘉 | Hybrid UPS (uninterruptible power supply) |
| CN103326595A (en) * | 2012-03-19 | 2013-09-25 | 上海利思电气有限公司 | Novel three-phase equilibrium reversible PWM rectifying device |
| CN105553288A (en) * | 2015-12-08 | 2016-05-04 | 哈尔滨理大晟源科技开发有限公司 | Control device and method for online uninterruptible power supply |
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2017
- 2017-10-12 CN CN201710945124.0A patent/CN107482764B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101521392A (en) * | 2008-02-28 | 2009-09-02 | 德观电子(上海)有限公司 | Off-line uninterrupted power supply device |
| CN201937311U (en) * | 2011-02-25 | 2011-08-17 | 天津福海银洋能源科技开发有限公司 | Full-automatic uniterruptable power output (UPS) |
| CN102222965A (en) * | 2011-06-29 | 2011-10-19 | 黄俊嘉 | Hybrid UPS (uninterruptible power supply) |
| CN103326595A (en) * | 2012-03-19 | 2013-09-25 | 上海利思电气有限公司 | Novel three-phase equilibrium reversible PWM rectifying device |
| CN105553288A (en) * | 2015-12-08 | 2016-05-04 | 哈尔滨理大晟源科技开发有限公司 | Control device and method for online uninterruptible power supply |
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| CN107482764A (en) | 2017-12-15 |
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