CN100578888C - Uninterruptible power supply - Google Patents
Uninterruptible power supply Download PDFInfo
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- CN100578888C CN100578888C CN200710125028A CN200710125028A CN100578888C CN 100578888 C CN100578888 C CN 100578888C CN 200710125028 A CN200710125028 A CN 200710125028A CN 200710125028 A CN200710125028 A CN 200710125028A CN 100578888 C CN100578888 C CN 100578888C
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Abstract
The invention discloses an uninterrupted power supply, which comprises an AC energy input, a DC power supply, a controllable switch, a boosting module and an inverter module, wherein the DC power supply consists of a battery pack; the boosting module includes an inductor, a first and a second switch tubes, a first and a second capacitors, a rectifying tube, a third and a fourth diodes, and a twelfth diode for preventing current from flowing through the first switch tube in negative phase AC state; the input terminal of the inductor is coupled with a live wire and the positive electrode of the DC power supply, and the output terminal is connected with the first terminal of the rectifying tube and coupled with the first terminal of the first switch tube; the third diode is connected with the first terminal of the first switch tube at the first terminal and connected with the negative electrode of the DC power supply through the first capacitor, the second capacitor and the fourth diode at the second terminal; a zero wire is coupled with the second terminal of the first switch tube and the first terminal of the second switch tube and connected between the first and the second capacitors; and the second switch tube as well as the second terminal of the rectifying tube is connected with the negative electrode of the DC power supply. The invention only needs one group of batteries and inductors which is at low cost.
Description
Technical field
The present invention relates to a kind of uninterrupted power supply.
Background technology
As shown in Figure 1, existing uninterrupted power supply (ups) Unity generally all comprises AC energy input, DC power supply, gate-controlled switch, boost module and inversion module, gate-controlled switch is arranged to will be connected on the boost module in AC energy input or the DC power supply selectively, boost module is used for input voltage being boosted and exporting inversion module to, and inversion module is used for the voltage transformation of boost module output is become alternating voltage output.Existing DC power supply comprises two Battery pack V1, V2, and this two Battery pack is responsible for positive and the negative power supply under the battery mode respectively.And boost module comprises two groups of inductance L 1, L2, two switching tube Q1, Q2, two diode D5, D6, capacitor C 1, C2.The conventional inversion module adopts the semi-bridge inversion topology more, comprises power switch pipe Q3, Q4, inductance L 3, capacitor C 3.
The weak point of this uninterrupted power supply is: two Battery packs and two groups of inductance need be set, and this will cause UPS complete machine cost significantly to improve.Because inductance L 1 is not worked when negative in positive phase time work; Inductance L 2 is worked when negative, does not work at positive phase time, and the inductance utilance is low.When the power output of UPS was bigger, Q1, Q2 needed that several pipes are in parallel to be used, can not be in full accord because of the switching time and the characteristic of power tube, and power tube can not be accomplished good current-sharing, this may reduce the reliability of whole system.Exchange in the output system at 220V, busbar voltage need rise to approximately ± 400V, adopts the inversion module of semi-bridge inversion topology, and power switch pipe Q3, Q4 need adopt the pipe of withstand voltage 1200V, the pipe cost height of withstand voltage 1200V; Switching frequency can not be too high after adopting the withstand voltage pipe of 1200V, and the filtering volume is big, the cost height; Inversion module adopts the semi-bridge inversion topology in addition, and inversion module is operated in two level states, and voltage ripple is big, and the filtering volume is big, the cost height; Inversion module, can charge to bus capacitor between 3 afterflow periods in inductance L, makes the voltage fluctuation on the bus capacitor bigger even out of control, and the busbar voltage balanced measure need be provided in addition.For example: during the positive work: during the Q3 conducting, capacitor C 1 gives inductance L 3 chargings; When Q3 turn-offed, inductance L 3 was through C3, C2, D4 discharge, and this discharging current can charge to C2, and during the positive work, bus capacitor C2 is uncontrolled, thereby made the voltage fluctuation on the C2 bigger.
Summary of the invention
The present invention is exactly for prior art needs two Battery packs, two groups of expensive deficiencies that inductance brings, and has proposed a kind of lower-cost uninterrupted power supply.
Technical problem of the present invention is solved by following technical scheme: a kind of uninterrupted power supply, comprise the AC energy input, DC power supply, gate-controlled switch, boost module and inversion module, described gate-controlled switch is arranged to selectively AC energy input or DC power supply is connected on the boost module, described boost module is used for input voltage being boosted and exporting inversion module to, described inversion module is used for the voltage transformation of boost module output is become alternating voltage output, described DC power supply is made of a Battery pack, and described boost module comprises an inductance, first switching tube, the second switch pipe, first electric capacity, second electric capacity, rectifying tube, the 3rd diode, the 4th diode stops electric current to flow through the 12 diode of first switching tube when alternating current negative state with being used for; The live wire of described inductance input and AC energy input and dc power anode coupling, its output link to each other with rectifying tube first end and are coupled with first end of first switching tube; Described the 3rd diode first end links to each other with first switching tube, first end, and described the 3rd diode second end links to each other with dc power cathode through first electric capacity, second electric capacity, the 4th diode; The zero line of the zero line of described AC energy input and second end coupling of first switching tube, the input of described AC energy also and first end of second switch pipe be coupled and be connected between first electric capacity and second electric capacity, second end of described second switch pipe and rectifying tube all links to each other with dc power cathode.
Preferably, described the 12 diode anode links to each other with described rectifying tube first end, and its negative electrode links to each other with first switching tube, first end.
Described the 12 diode anode links to each other with first switching tube, second end, and its negative electrode links to each other with second switch pipe first end.
Described rectifying tube comprises diode or comprises the power field effect transistor of diode in the belt body or comprise the igbt of diode in the belt body.
Described boost module has at least two, crisscross parallel between each boost module.
Described inversion module has at least two, crisscross parallel between each inversion module.
Described inversion module has three, and is in parallel between each inversion module, and each inversion module draws an output respectively, is used to realize the three-phase output of uninterrupted power supply.
Described inversion module is the tri-level inversion topology.
The beneficial effect that the present invention is compared with the prior art is: the present invention only need use a Battery pack and inductance, can realize uninterrupted power supply, and the present invention greatly reduces the cost of uninterrupted power supply.Inversion module of the present invention adopts the tri-level inversion topology, can reduce stresses of parts, reduces the filtering volume, improves overall efficiency, reduces and expects this.In addition, adopt the tri-level inversion circuit, by control, between the afterflow period, freewheel current can not charged to bus capacitor at inductance, compares with half-bridge inversion circuit, does not need other measures to prevent the busbar voltage imbalance.The present invention can increase the power output of UPS by crisscross parallel boost module and inversion module, reduces the busbar voltage ripple.
Description of drawings
Fig. 1 is the prior art constructions schematic diagram;
Fig. 2 is the structural representation of the specific embodiment of the invention one;
Fig. 3 is the current direction schematic diagram of the specific embodiment of the invention one in the phase I;
Fig. 4 is the current direction schematic diagram of the specific embodiment of the invention one in second stage;
Fig. 5 is the current direction schematic diagram of the specific embodiment of the invention one in the phase III;
Fig. 6 is the current direction schematic diagram of the specific embodiment of the invention one in the quadravalence section;
Fig. 7 is the current direction schematic diagram of the specific embodiment of the invention one at five-stage;
Fig. 8 is the current direction schematic diagram of the specific embodiment of the invention one in the 6th stage;
Fig. 9 is the current direction schematic diagram of the specific embodiment of the invention one in the 7th stage;
Figure 10 is the current direction schematic diagram of the specific embodiment of the invention one in the 8th stage;
Figure 11 is the structural representation of the specific embodiment of the invention two;
Figure 12 is the structural representation of the specific embodiment of the invention three;
Figure 13 is the structural representation of the specific embodiment of the invention four;
Figure 14 is the structural representation of the specific embodiment of the invention five;
Figure 15 is the structural representation of the specific embodiment of the invention six.
Embodiment
Also in conjunction with the accompanying drawings the present invention is described in further details below by concrete execution mode.
Embodiment one
As shown in Figure 2, a kind of uninterrupted power supply (ups) Unity, comprise AC energy input, DC power supply, gate-controlled switch, boost module and inversion module, described gate-controlled switch is arranged to will be connected on the boost module in AC energy input or the DC power supply selectively, described boost module is used for the input voltage that AC energy is imported or DC power supply provides being boosted and exporting inversion module to, and described inversion module is used for the voltage transformation of boost module output is become alternating voltage output.Described DC power supply is made of a Battery pack BAT, and described boost module comprises an inductance L 1, the first switching tube Q1, second switch pipe Q2, first capacitor C 1, second capacitor C 2, rectifying tube D11, the 12 diode D12, the 3rd diode D3 and the 4th diode D4.Described rectifying tube is a diode.Described the 12 diode D12 is used for stoping when alternating current negative state electric current to flow through the first switching tube Q1.Described rectifying tube D11 is a diode.Described switching tube can be power field effect pipe, insulated gate bipolar transistor (Insulated Gate Bipolar Transistor is called for short IGBT) or other controllable devices.
Described gate-controlled switch comprises first switch S 1, second switch S2.Described first switch S 1, second switch S2 can be relays, it also can be controllable semiconductor device, by control the opening of first switch S 1, second switch S2, closure can promptly be carried out the switching of civil power mode of operation and battery operated pattern selectively with being connected on the boost module in AC energy input or the DC power supply.
Described inversion module can be the tri-level inversion topology, semi-bridge inversion is topological or other, preferred tri-level inversion topology.Inversion module is the tri-level inversion topology in this embodiment, and this inversion module is connected with center line with positive direct-current bus, negative dc bus.Inversion module comprises the 5th switching tube Q5, the 6th switching tube Q6, the 7th switching tube Q7, the 8th switching tube Q8, the 9th diode D9, the tenth diode D10, the 3rd inductance L 3, the 3rd capacitor C 3.The complementary work of described the 5th switching tube Q5 and the 7th switching tube Q7, the complementary work of the 6th switching tube Q6 and the 8th switching tube Q8.Adopt the inversion module of tri-level inversion topology to compare with existing half-bridge topology, can use the withstand voltage power tube of 600V (MOSFET or IGBT) to the 220VAC output system, can improve switching frequency like this, thereby reduce to export the volume of LC filter, reduce the cost of filter simultaneously.As shown in Figure 2, during positive work: the 6th switching tube Q6 is permanent logical, and during the 5th switching tube Q5 conducting, capacitor C 1 gives inductance L 3 chargings; When the 5th switching tube Q5 turn-offed, the electric current on the inductance L 3 was by the 3rd capacitor C 3, the 9th diode D9, the 6th switching tube Q6 afterflow, and this freewheel current can not charged to bus capacitor, and when therefore adopting the tri-level inversion circuit, the bus capacitor voltage fluctuation is less.
The anodal coupling of the live wire I/P_L of described inductance L 1 input A and AC energy input and DC power supply BAT, inductance L 1 output B links to each other with rectifying tube D11 negative electrode, the 12 diode D12 anode.Described rectifying tube D11 anode links to each other with dc power cathode.Described the 12 diode D12 negative electrode drains with the first switching tube Q1, the 3rd diode D3 anode links to each other.The described first switching tube Q1 source electrode links to each other with zero line N, the second switch pipe Q2 drain electrode of AC energy input.The 3rd diode D3 anode links to each other with second capacitor C 2, the 4th diode D4 anode with first capacitor C 1 successively.The 4th diode D4 negative electrode links to each other with dc power cathode.Described second switch pipe Q2 links to each other with the drain electrode of the first switching tube Q1 source electrode, and second switch pipe Q2 source electrode links to each other with dc power cathode.The zero line N of described AC energy input is connected between the source electrode, second switch pipe Q2 drain electrode of the first switching tube Q1, and the zero line N of AC energy input is also connected between the source electrode of the first switching tube Q1, the second switch pipe Q2 drain electrode coupling of first end and is connected between first capacitor C 1 and second capacitor C 2.The external pulse-width modulation of grid (control end) of described first switching tube Q1 and second switch pipe Q2 (PulseWidth Modulation is called for short PWM) control signal.
The operation principle of above-mentioned uninterrupted power supply is as follows: when UPS is in city's power mode following time, i.e. AC energy input is (this moment first switch S, 1 closure, second switch S2 disconnects) just often, and DC power supply is not worked, and the AC energy input is connected on the boost module.When UPS is in battery mode following time, i.e. during AC energy input unusual (this moment first, switch S 1 disconnected second switch S2 closure), the AC energy input is not worked, DC power supply work, and DC power supply is connected on the boost module.To do labor below.
At electric main positive work state:
Phase I: as shown in Figure 3, the first switching tube Q1 and second switch pipe Q2 are operated in the PWM state.In a switch periods, the first switching tube Q1 closure, second switch pipe Q2 disconnects, and current path is: by the live wire I/P_L of AC energy input flow through first switch S 1, inductance L the 1, the 12 diode D12, the first switching tube Q1, return the zero line N of AC energy input.Be recharged in this process inductance L 1.
Second stage: as shown in Figure 4, the first switching tube Q1 and second switch pipe Q2 disconnect, current path is the live wire I/P_L by AC energy input flow through first switch S 1, inductance L the 1, the 12 diode D12, the 3rd diode D3, first capacitor C 1, returns the zero line N of AC energy input.Electric energy stored makes the voltage of first capacitor C 1 reach the positive direct-current busbar voltage to 1 charging of first capacitor C on the AC energy stack inductance L 1 in this process.
At electric main negative work state:
Phase III: as shown in Figure 5, the first switching tube Q1 disconnects, second switch pipe Q2 closure, and current path is: by the zero line N of AC energy input flow through second switch pipe Q2, rectifying tube D11, inductance L 1, return the live wire I/P_L of AC energy input.Be recharged in this process inductance L 1.
The quadravalence section: as shown in Figure 6, second switch pipe Q2 disconnects, and current path is the zero line N by the AC energy input flow through second capacitor C 2, the 4th diode D4, the first diode D11, inductance L 1, returns the live wire I/P_L of AC energy input.Second switch pipe Q2 is operated in the PWM state in this process, and AC energy is by 2 chargings of 1 pair second capacitor C of inductance L.
At battery positive work state:
Five-stage: as shown in Figure 7, the first switching tube Q1 and second switch pipe Q2 are operated in the PWM state.In a switch periods, the first switching tube Q1, second switch pipe Q2 are closed, current path is: by the anode of DC power supply flow through second switch, inductance L the 1, the 12 diode D12, the first switching tube Q1, second switch pipe Q2, return battery cathode.Be recharged in this process inductance L 1.
The 6th stage: as shown in Figure 8, the first switching tube Q1 disconnects, second switch pipe Q2 closure, current path is: by the anode of DC power supply flow through first switch S 1, inductance L the 1, the 12 diode D12, the 3rd diode D3, first capacitor C 1, second switch pipe Q2, return battery cathode.Electric energy stored makes the voltage of first capacitor C 1 keep the positive direct-current busbar voltage to 1 charging of first capacitor C on the DC power supply stack inductance L 1 in this process.
At battery negative work state:
The 7th stage: as shown in Figure 9, the first switching tube Q1, second switch pipe Q2 are closed, current path is: by the anode of DC power supply flow through second switch, inductance L the 1, the 12 diode D12, the first switching tube Q1, second switch pipe Q2, return battery cathode.Be recharged in this process inductance L 1.
The 8th stage: as shown in figure 10, the first switching tube Q1 closure, second switch pipe Q2 disconnect, current path is: by the anode of DC power supply flow through first switch S 1, inductance L the 1, the 12 diode D12, the first switching tube Q1, second capacitor C 2, the 4th diode D3, return battery cathode.Electric energy stored makes the voltage of first capacitor C 2 keep negative DC bus-bar voltage to 2 chargings of second capacitor C on the DC power supply stack inductance L 1 in this process.
The work of inversion module is by phase-locked realization, and described inversion module is with the positive and negative bus converting direct-current voltage into alternating-current voltage output on first and second electric capacity, and its operating principle repeats no more herein.This embodiment adopts the tri-level inversion topology, can reduce the voltage ripple on the bus capacitor.
Embodiment two
As shown in figure 11, this embodiment is with the difference of embodiment one: changed the position of the 12 diode D12, the 12 diode D12 has been moved between the first switching tube Q1 source electrode and the second switch pipe Q2 drain electrode in this embodiment.That is: the anode of the 12 diode D12 links to each other with the first switching tube Q1 source electrode, and the 12 diode D12 negative electrode links to each other with the zero line N of second switch pipe Q2 drain electrode with the AC energy input.Like this, when first switching tube Q1 shutoff, the 3rd diode D3 conducting, can save a diode losses.
Embodiment three
As shown in figure 12, this embodiment is with the difference of embodiment two: rectifying tube replaces with the power field effect pipe (MOS) of belt body diode or the insulated gate bipolar transistor of belt body diode (Insulated Gate Bipolar Transistor is called for short IGBT).Under city's power mode, diode D11 uses as rectifier diode in the body of described transistor Q11; Under battery mode, the realization of opening, close by control Q11 discharges and recharges inductance L 1, compares with by the break-make of controlling the first switching tube Q1 and second switch pipe Q2 inductance L 1 being discharged and recharged among Figure 11, can save the loss of a metal-oxide-semiconductor again.
Embodiment four
As shown in figure 13, this embodiment is with the difference of embodiment one: boost module has two in this embodiment, crisscross parallel between each boost module.The operation principle of each boost module is all identical with the operation principle of boost module in the embodiment one, but between each boost module in this embodiment with certain phase shifting work.If two boost modules carry out crisscross parallel, the 180 degree phase place operations of then staggering between each boost module; If three boost modules carry out crisscross parallel, the 120 degree operations of then staggering between each boost module, the rest may be inferred.This embodiment can increase power output, and the switching tube in each boost module can only adopt single tube like this, has reduced the power tube integrity problem that uses in parallel.Obviously, this crisscross parallel can expand to 3,4 ... n boost module crisscross parallel.After adopting the crisscross parallel technology, under the condition that the inductance ripple current equates, compare with interlace scheme not, can reduce the total ripple current of input current, thereby reduce the volume of input electromagnetic interface filter, the cost of uninterrupted power supply is also further reduced.
Embodiment five
As shown in figure 14, this embodiment is with the difference of embodiment one: inversion module has two in this embodiment, crisscross parallel between each inversion module.Obviously, also can be ... n inversion module carries out crisscross parallel with 3,4.This embodiment can increase the capacity of power output.
Embodiment six
As shown in figure 15, this embodiment is with the difference of embodiment one: inversion module has three in this embodiment, in parallel between each inversion module, and each inversion module draws an output respectively, is used to realize the three-phase output of uninterrupted power supply.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (9)
1. uninterrupted power supply, comprise the AC energy input, DC power supply, gate-controlled switch, boost module and inversion module, described gate-controlled switch is arranged to selectively AC energy input or DC power supply is connected on the boost module, described boost module is used for input voltage being boosted and exporting inversion module to, described inversion module is used for the voltage transformation of boost module output is become alternating voltage output, it is characterized in that: described DC power supply is made of a Battery pack (BAT), and described boost module comprises an inductance (L1), first switching tube (Q1), second switch pipe (Q2), first electric capacity (C1), second electric capacity (C2), rectifying tube (D11), the 3rd diode (D3), the 4th diode (D4) and be used for when alternating current negative state stoping electric current to flow through the 12 diode (D12) of first switching tube (Q1); The live wire of described inductance (L1) input and AC energy input and dc power anode coupling, its output link to each other with rectifying tube (D11) first end and are coupled with first end of first switching tube (Q1); Described the 3rd diode (D3) first end links to each other with first switching tube (Q1), first end, and described the 3rd diode (D3) second end links to each other with dc power cathode through first electric capacity (C1), second electric capacity (C2), the 4th diode (D4); The zero line of the zero line of described AC energy input and second end coupling of first switching tube (Q1), the input of described AC energy also and first end of second switch pipe (Q2) be coupled and be connected between first electric capacity (C1) and second electric capacity (C2), second end of described second switch pipe (Q2) all links to each other with dc power cathode with second end of rectifying tube (D11).
2. uninterrupted power supply according to claim 1 is characterized in that: described the 12 diode (D12) anode links to each other with described rectifying tube (D11) first end, and its negative electrode links to each other with first switching tube (Q1), first end.
3. uninterrupted power supply according to claim 1 is characterized in that: described the 12 diode (D12) anode links to each other with first switching tube (Q1), second end, and its negative electrode links to each other with second switch pipe (Q2) first end.
4. uninterrupted power supply according to claim 2 is characterized in that: described rectifying tube (D11) comprises diode or comprises the power field effect transistor of diode in the belt body or comprise the igbt of diode in the belt body.
5. uninterrupted power supply according to claim 3 is characterized in that: described rectifying tube (D11) comprises diode or comprises the power field effect transistor of diode in the belt body or comprise the igbt of diode in the belt body.
6. according to the arbitrary described uninterrupted power supply of claim 1-5, it is characterized in that: described boost module has at least two, crisscross parallel between each boost module.
7. according to the arbitrary described uninterrupted power supply of claim 1-5, it is characterized in that: described inversion module has at least two, crisscross parallel between each inversion module.
8. according to the arbitrary described uninterrupted power supply of claim 1-5, it is characterized in that: described inversion module has three, and is in parallel between each inversion module, and each inversion module draws an output respectively, is used to realize the three-phase output of uninterrupted power supply.
9. according to the arbitrary described uninterrupted power supply of claim 1-5, it is characterized in that: described inversion module is the tri-level inversion topology.
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| CN200710125028A CN100578888C (en) | 2007-12-14 | 2007-12-14 | Uninterruptible power supply |
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| CN200710125028A CN100578888C (en) | 2007-12-14 | 2007-12-14 | Uninterruptible power supply |
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| CN100578888C true CN100578888C (en) | 2010-01-06 |
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Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101834461B (en) * | 2009-12-16 | 2012-07-18 | 艾默生网络能源有限公司 | Discharge circuit of UPS (Uninterrupted Power Supply) battery |
| CN102118035B (en) * | 2009-12-30 | 2015-04-29 | 西门子公司 | Grid-connected inverter |
| CN101789617A (en) * | 2010-01-19 | 2010-07-28 | 艾默生网络能源有限公司 | UPS and the control method of generatrix |
| CN101789690B (en) * | 2010-01-26 | 2011-12-14 | 山特电子（深圳）有限公司 | UPS preceding stage electric volt increase station |
| CN103051222A (en) * | 2011-10-13 | 2013-04-17 | 台达电子工业股份有限公司 | Effectively controlled integrated inverter device and operation method thereof |
| CN103208855B (en) * | 2012-01-17 | 2016-06-29 | 华为技术有限公司 | A kind of uninterrupted power source and DC-DC converter |
| CN102843846B (en) * | 2012-07-16 | 2015-04-22 | 绍兴文理学院 | Half-bridge inverting circuit in electrodeless lamp electronic ballast |
| CN103427481A (en) * | 2013-08-21 | 2013-12-04 | 广东易事特电源股份有限公司 | Topological circuit for uninterruptible power supply |
| CN103560553A (en) * | 2013-10-17 | 2014-02-05 | 华为技术有限公司 | Uninterruptible power source circuit and control method thereof |
| CN104660025B (en) * | 2013-11-20 | 2018-07-31 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | The busbar voltage soft-start method of uninterruptible power supply |
| CN103731618B (en) * | 2013-11-27 | 2017-12-12 | 乐视致新电子科技（天津）有限公司 | Display device and its readiness control circuit |
| CN103825454B (en) * | 2013-12-17 | 2016-08-17 | 中国船舶重工集团公司第七一九研究所 | A kind of three level DC converting means and use the transformation of electrical energy method of this device |
| CN107809131A (en) * | 2016-09-06 | 2018-03-16 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | Uninterrupted power source |
| CN110365223B (en) * | 2018-04-08 | 2024-02-13 | 佛山科学技术学院 | Three-phase high-power uninterrupted power supply based on three-level inversion technology |
| CN111478582A (en) * | 2019-01-23 | 2020-07-31 | 日月元科技(深圳)有限公司 | Bidirectional DC-DC converter |
| CN111835075B (en) * | 2019-04-15 | 2022-04-12 | 日月元科技(深圳)有限公司 | Switching circuit capable of realizing common battery and non-common battery architecture |
| CN117792126A (en) * | 2022-09-21 | 2024-03-29 | 维谛技术有限公司 | Uninterruptible power supply rectification converter and control method thereof |
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Address after: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee after: Vitamin Technology Co., Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee before: Aimosheng Network Energy Source Co., Ltd. |
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