CN102684513A - Uninterruptible power supply and rectifying circuit of uninterruptible power supply - Google Patents
Uninterruptible power supply and rectifying circuit of uninterruptible power supply Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to an uninterruptible power supply and a rectifying circuit of the uninterruptible power supply. The rectifying circuit comprises a semiconductor control rectifier (SCR), a transformer, a high-frequency rectifier and a rectifying controller, wherein the input end of the SCR is connected with a power supply, the primary edge of the transformer is connected with the power supply and the input end of the SCR, the input end of the high-frequency rectifier is connected with the secondary edge of the transformer, the output end of the high-frequency rectifier is connected in series with the output end of the SCR so that the direct current voltage is output through the serial connection between the SCR and the high-frequency rectifier, the rectifying controller calculates the harmonic current of the total input end according to the detected current flowing into the total input end of the SCR and the transformer, or calculates the harmonic current flowing into the SCR according to the detected current of the input end flowing into the SCR, and in addition, the high-frequency rectifier is controlled to generate the harmonic current opposite to the calculated harmonic current according to the calculated harmonic current. When the technical scheme of the invention is implemented, the harmonic current of the total input end can be reduced or even eliminated, and the power factor value is improved, so the current of the total input end approximates to the sine wave current.
Description
Technical field
The present invention relates to power electronic technology, more particularly, relate to a kind of uninterrupted power supply (ups) Unity and rectification circuit thereof.
Background technology
Along with people's is to the increase day by day of data protection demand, and UPS (Uninterruptible Power Supply, uninterrupted power supply) has obtained use more and more widely.At present; High power UPS often adopts SCR (Silicon Controlled Rectifier; Controllable silicon) rectifier; This SCR rectifier arrives the needed voltage of storage battery with the input voltage that changes through the phase shift slicing adjustment back voltage stabilizing of full-bridge SCR rectifier, and accumulators provides the charging voltage that needs.The SCR rectifier is because it is simple, and reliable, cost is low, has obtained using widely for a long time.
Fig. 1 is the circuit diagram of a kind of UPS of prior art, and this UPS comprises three-phase alternating current input source Source, switch CB1, inductance L 1, full-bridge SCR rectifier SCR1, capacitor C 1, switch CB2, storage battery Battery, inverter INV1, inductance L out, ac filter electric capacity Filter Cap2.The alternating voltage that three-phase voltage source Source is exported is sent to inductance L 1 through switch CB1; Through the direct voltage of voltage stabilizing behind the full-bridge SCR rectifier SCR1 to hope; Capacitor C 1 is a flat wave capacitor, and the two ends of storage battery Battery are connected on the dc bus through the CB2 switch.Inverter INV1 goes out alternating voltage with the direct voltage inversion again, and this alternating voltage obtains alternating voltage through three pole reactor Lout and three-phase alternating current filter capacitor Filter Cap2 filtering at output.
But, because SCR pipe self makes the harmonic current that flows into full-bridge SCR rectifier big; Power factor is low; There are serious disturbance in electrical network and other equipment, and the misoperation of the equipment that the harmonic current of high frequency not only causes linking to each other with this UPS also causes harmonic loss.
In the today that requires environmental protection, need to mix other passive or active filter and reduce harmonic current to the input of SCR rectifier, so not only volume is big, Heavy Weight, and increased cost.
The method that another kind reduces harmonic current is to use IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) rectifier to replace the SCR rectifier, proofreaies and correct to realize PF (Power Factor, power factor).But, do making cost increase like this, efficient reduces.
Summary of the invention
The technical problem that the present invention will solve is; The defective that harmonic current is big, input power factor is low to the above-mentioned inflow SCR rectifier of prior art provides a kind of rectification circuit, can reduce to exchange the harmonic current of input source; Improve input power factor, and reduce cost.
According to an aspect of the present invention, a kind of rectification circuit that is used for the alternating voltage of power supply output is converted into direct voltage is provided, this rectification circuit comprises: its input connects the SCR rectifier of said power supply; Its former limit connects the transformer of the input of said power supply and said SCR rectifier; Hf rectifier, its input connects the secondary of said transformer, with and output be connected in series the output of said SCR rectifier so that export said direct voltage through the series connection of said SCR rectifier and said hf rectifier; And commutation controller; Its electric current sum according to the former limit of the electric current of the input of the inflow SCR rectifier that is detected and inflow transformer is calculated the harmonic current that flows into rectification circuit; Perhaps the electric current according to the input of the inflow SCR rectifier that is detected calculates the harmonic current that flows into the SCR rectifier, and produces and the opposite harmonic current of harmonic current that is calculated according to the harmonic current control hf rectifier that is calculated.
The present invention also constructs a kind of UPS, comprises according to rectification circuit of the present invention, storage battery and inverter, and the direct voltage of said rectification circuit output is a charge in batteries, and said inverter is an alternating current with the direct voltage inversion of rectification circuit output.
The technical scheme of embodiment of the present invention; Commutation controller calculates the harmonic current of total input according to the electric current of total input of the inflow rectification circuit that is detected; Perhaps the electric current according to the input that flows into the SCR rectifier calculates the harmonic current that flows into the SCR rectifier; And according to the opposite harmonic current of harmonic current that the harmonic current control hf rectifier that is calculated produces and calculated, be zero after harmonic current that is produced and the harmonic current addition of being calculated, so just reduce even eliminate the harmonic current of total input; Improved power factor value, thereby made the electric current of total input be sine-wave current haply.And owing to come output dc voltage through be connected in series hf rectifier and SCR rectifier, so hf rectifier is not the full power conversion, makes its volume and cost all lower.
In addition, through making the idle component of hf rectifier compensation input, can make the electric current of total input be essentially sine-wave current.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Fig. 1 is the circuit diagram of a kind of UPS of prior art;
Fig. 2 is the logic diagram of UPS embodiment one of the present invention;
Fig. 3 is the logic diagram of UPS embodiment two of the present invention;
Fig. 4 is the circuit diagram of UPS embodiment three of the present invention;
Fig. 5 is the logic diagram of commutation controller according to an embodiment of the invention.
Embodiment
As shown in Figure 2, in the logic diagram of UPS embodiment one of the present invention, this UPS comprises rectification circuit, storage battery and inverter; Just often such as the power supply of three-phase alternating current input source; Rectification circuit is a direct voltage with the ac voltage rectifier of power supply output, and this direct voltage is a charge in batteries, simultaneously; Inverter is an alternating current with the direct voltage inversion of rectification circuit output, to give the load (not shown) power supply of this UPS.Stress the rectification circuit of this UPS below.
In the rectification circuit of this UPS; Include: SCR rectifier, transformer, hf rectifier and commutation controller; The output of power supply connects the former limit of the input and the transformer of SCR rectifier respectively; The secondary of transformer connects the input of said hf rectifier, SCR rectifier and hf rectifier series connection back output dc voltage.Commutation controller connects power supply and hf rectifier; The electric current sum (being also referred to as the electric current of total input) on the input of this commutation controller detection inflow SCR rectifier and the former limit of transformer; Calculate the harmonic current of total input according to the electric current of the total input that is detected; For example, can calculate harmonic current through Fourier transform.About the computational methods of harmonic current, those skilled in the art can select according to actual needs, and its details repeats no more.After calculating harmonic current; Harmonic current control hf rectifier according to being calculated produces and the opposite harmonic current of harmonic current that is calculated; Be specially: this commutation controller is the harmonic current that the calculates controlled signal in back of negating, and controls the break-make of the switching tube of hf rectifier through the driving pulse of output after this control signal modulation, and hf rectifier is produced and the opposite harmonic current of harmonic current that is calculated; Like this; Just reducing even eliminate the harmonic current of total input, improved power factor value, is near sinusoidal ripple electric current thereby make the electric current of total input.
In addition, the harmonic current that significantly produced of the issuable harmonic current of transformer generally less than the SCR rectifier.Therefore; This commutation controller can only detect the electric current of the input that flows into the SCR rectifier; Calculate the harmonic current that flows into the SCR rectifier according to the electric current that is detected, and produce and the opposite harmonic current of harmonic current that is calculated according to the harmonic current control hf rectifier that is calculated.
In the present embodiment; Hf rectifier is connected in parallel on the input of SCR rectifier; Harmonic current compensation function through hf rectifier has realized that the PF of total input proofreaies and correct; Make low characteristics of simple and reliable cost according to the existing SCR rectifier of the rectification circuit of present embodiment, reduce even eliminated the harmonic current of total input again, improved power factor value.
And owing to come output dc voltage through be connected in series hf rectifier and SCR rectifier, so hf rectifier is not the full power conversion, for example has only 20% rated power usually, makes its volume and cost all lower.
Should be noted that when power supply is the interchange input source of three-phase mentioned SCR rectifier, hf rectifier, the transformer of the application is three-phase.
Preferably, SCR rectifier and hf rectifier are respectively full-bridge SCR rectifier and full-bridge high-frequency rectifier.The full-bridge high-frequency rectifier can adopt full-bridge IGBT rectifier or full-bridge MOS rectifier, and full-bridge IGBT rectifier or full-bridge MOS rectifier are complete at a high speed control device.
Preferably, transformer is a step-down transformer, and like this, transformer has not only played buffer action, makes the voltage stress of hf rectifier reduce greatly simultaneously, and therefore, hf rectifier can be selected low withstand voltage, low-loss, speed is high, price is low device for use.When the secondary voltage of transformer enough hangs down, also correspondingly reduced conduction voltage drop, the full-bridge MOS rectifier that hf rectifier can select for use metal-oxide-semiconductor to make up in addition, also can select for use reduced size to reach other device than light weight, like inductance, electric capacity etc.
In volume figure of UPS embodiment two of the present invention shown in Figure 3, this UPS comprises rectification circuit, storage battery and inverter, such as the power supply of three-phase alternating current input source just often; Rectification circuit converts the alternating voltage of power supply output into direct voltage; This direct voltage is a charge in batteries, and simultaneously, inverter is an alternating current with the direct voltage inversion of rectification circuit output; To give the load (not shown) power supply of this UPS, stress the rectification circuit of this UPS below.
In the rectification circuit of this UPS; Include: SCR rectifier, transformer, hf rectifier and commutation controller; The output of power supply connects the former limit of the input and the transformer of SCR rectifier respectively; The secondary of transformer connects the input of said hf rectifier, SCR rectifier and hf rectifier series connection back output dc voltage.Commutation controller connects power supply, SCR rectifier and hf rectifier.Compare the UPS among the embodiment one, different is the UPS of present embodiment: commutation controller also comes stable DC output voltage U dc through the output voltage of regulating the SCR rectifier except realizing the harmonic current compensation through the control hf rectifier.In the present embodiment; The output voltage of hf rectifier is predetermined direct voltage; This commutation controller detects the direct voltage Udc that is exported after SCR rectifier and the hf rectifier series connection; And regulate the output voltage of SCR rectifier according to the direct voltage Udc that detected, making direct voltage Udc is desired voltage values.Specifically can be: this commutation controller sends driving pulse according to the direct voltage Udc that is detected, and with the break-make that the SCR that controls the SCR rectifier manages, making direct voltage Udc is desired voltage values.For example; This rectifier controller comprises the current/voltage dual-loop control circuit; Its input current according to direct voltage Udc that is detected and SCR rectifier produces control signal; Utilize this control signal to come pulse signals to modulate then, the pulse duration of modulated pulse signal for example is to obtain driving pulse.Be not limited to content disclosed herein, those skilled in the art can select other to generate the method for driving pulse according to actual needs.
In another embodiment, commutation controller also comes stable DC output voltage U dc through the output voltage of regulating hf rectifier except the output voltage of regulating the SCR rectifier.Particularly; The direct voltage Udc that this commutation controller detection SCR rectifier and hf rectifier series connection back are exported and the output voltage U dc1 of SCR rectifier; And according to the voltage U dc that is detected and Udc1 control SCR rectifier and hf rectifier, the direct voltage Udc that the series connection back is exported is a desired voltage values, and specifically can be: this commutation controller sends two groups of driving pulses according to voltage U dc that is detected and Udc1; Wherein, The break-make of the SCR pipe of first group of driving pulse control SCR rectifier makes the SCR rectifier export first direct voltage, the break-make of the switching tube of second group of driving pulse control hf rectifier (for example IGBT pipe); Make hf rectifier export second direct voltage; Because SCR rectifier and hf rectifier series connection, thus be direct voltage Udc after this first direct voltage and the second direct voltage addition, and this direct voltage Udc can reach desired voltage values.Generally, the SCR of SCR rectifier pipe makes the power factor of input higher for full conducting, and the harmonic current of total input is less.
Among this embodiment, through the voltage-regulation function harmonic electric current compensation function of hf rectifier, can realize the PF correction of total input and the quick adjustment of dc voltage stability, thereby improve the performance of rectification circuit, for example, improve system response time.
Fig. 4 is the circuit diagram of UPS embodiment three of the present invention; In this UPS; The three-phase alternating current of three-phase alternating current input source Source output is divided into two-way behind switch CB1; One the tunnel converts direct voltage Udc1 into, the direct voltage Udc1 filtering that capacitor C 1 is exported for full-bridge SCR rectifier SCR1 successively after the rectification of inductance L 1 filtering, full-bridge SCR rectifier SCR1; Another road is output dc voltage Udc2 after transformer T1 isolation and step-down, ac filter electric capacity Filter Cap1 filtering, inductance L 2 filtering, full-bridge IGBT rectifier IGBT1 rectification, and capacitor C 2 is the direct voltage Udc2 filtering of full-bridge IGBT rectifier IGBT1 output.Because full-bridge SCR rectifier SCR1 and full-bridge IGBT rectifier IGBT1 series connection are so be the direct voltage Udc of the total output of this rectification circuit, i.e. Udc=Udc1+Udc2 after direct voltage Udc1 and the Udc2 addition.The direct voltage Udc that is exported provides charging voltage through switch CB2 accumulators Battery, and preferably, direct voltage Udc carries out equal floating charge to storage battery Battery, and promptly direct voltage Udc accumulators Battery provides equal float charge voltage.Simultaneously, inverter INV1 alternating voltage with the direct voltage Udc inversion of being exported, and the 3rd inductance L out and ac filter electric capacity Filter Cap2 are the alternating voltage filtering of being exported.
Commutation controller U1 detects direct voltage Udc and Udc1; After calculating, send two group of 6 road driving pulse Drver1, Driver2 and come to control respectively SCR pipe and the break-make of the IGBT among the IGBT rectifier IGBT1 among the SCR rectifier SCR1; Particularly; Driving pulse Driver1 drives full-bridge SCR rectifier SCR1 and makes its output dc voltage Udc1, and driving pulse Driver2 drives full-bridge IGBT rectifier IGBT1 and makes its output dc voltage Udc2.The SCR pipe is basic for expiring conducting under the normal condition; Make the power factor (PF) of total input higher; The harmonic current of total input is less; Commutation controller U1 major control driving pulse Driver2 regulates the output dc voltage Udc2 of full-bridge IGBT rectifier, make direct voltage Udc1 and direct voltage Udc2's and be desired voltage values.Owing to adopt jointly controlling of full-bridge SCR rectifier SCR1 and full-bridge IGBT rectifier IGBT1; Can make control simple efficient; Full-bridge SCR rectifier SCR1 adopts at a slow speed and regulates, and keeps the direct voltage Udc of total output roughly stable, simultaneously; Adopt full-bridge IGBT rectifier IGBT1 can realize quick adjustment, thereby realize that quickly and efficiently direct voltage Udc reaches desired voltage values.
Simultaneously, full-bridge IGBT rectifier IGBT1 also is equivalent to a harmonic filter.The electric current of the input of electric current or the SCR rectifier SCR1 of commutation controller U1 through detecting total input; Calculate the harmonic current of the input of total input or SCR rectifier SCR1; Control full-bridge IGBT rectifier IGBT1 then and send opposite harmonic current; After the harmonic current addition of the input of this harmonic current and total input or SCR rectifier SCR1, just obtain near sinusoidal ripple electric current, thereby obtain higher power factor (PF) value and less harmonic current.
In addition; If the output voltage of three-phase alternating current input source is higher, the driving pulse Driver1 that commutation controller is exported makes direct voltage Udc1 be controlled in a lower value through phase shifting control; At this moment; The harmonic current of total input is bigger, still compensates the harmonic wave that full-bridge SCR rectifier is produced by full-bridge IGBT rectifier IGBT1, and regulates the size of direct voltage Udc2.
Preferably; When adopting inductance L 2 to carry out filtering in the above-described embodiments; The mode of the inductance series connection that also available a plurality of filtering parameters are less realizes filtering; These a plurality of inductance can be connected through the mode of hot plug between the input of secondary and full-bridge high-frequency rectifier of transformer, can improve the reliability of system like this, make that the cost of production and maintenance of UPS is lower.
Likewise; When adopting ac filter electric capacity Filter Cap2 to carry out filtering in the above-described embodiments; Also can select for use the mode of the less ac filter electric capacity parallel connection of a plurality of filtering parameters to realize filtering; These a plurality of ac filter electric capacity can be connected the secondary of transformer through the mode of hot plug, to improve the reliability of system, make that the cost of production and maintenance of UPS is lower.
Fig. 5 is the logic diagram of commutation controller according to an embodiment of the invention.As shown in Figure 5, this commutation controller comprises that analog to digital conversion circuit, SCR Drive and Control Circuit (first control circuit), IGBT Drive and Control Circuit (second control circuit) and first and second pulse-modulated signals produce circuit.The operation principle of commutation controller is described below in conjunction with Fig. 4.
This commutation controller detects AC side input voltage and the output voltage U dc1 of SCR rectifier (SCR1 among Fig. 4) and the electric current of its input of rectification circuit; The analog signal that detects is carried out analog-to-digital conversion through analog to digital conversion circuit, is sent to the SCR Drive and Control Circuit then.The SCR Drive and Control Circuit for example comprises the voltage and current double closed-loop control circuit; The value of wherein digitized output voltage U dc1 and setting is carried out PID (Proportion Integral Differential; PID) regulates; The signal that obtains carries out the PID adjusting as the given input of electric current loop and the electric current of digitized SCR rectifier input, and signal that obtains then and digitized AC side input voltage carry out the synchronous control signal (first control signal) that is used to regulate output voltage U dc1 with generation.The control signal that generates is fed to first pulse-modulated signal and produces circuit.First pulse-modulated signal produces circuit and modulates through utilizing this control signal pulse signals, and the SCR driving pulse Driver1 that is used to drive the SCR rectifier is exported in for example pulse width modulation.
In addition; Commutation controller also detects the output voltage U dc2 of IGBT rectifier (IGBT1 among Fig. 4) and the electric current of its input; The analog signal that detects is carried out analog-to-digital conversion through analog to digital conversion circuit, and the electric current with above-mentioned digitized AC side input voltage and digitized SCR rectifier input is fed to the IGBT Drive and Control Circuit then.The IGBT Drive and Control Circuit is made up of two parts: the harmonic wave control signal generating unit; It is reference with digitized AC side input voltage; Calculate the harmonic current that flows into the SCR rectifier according to the galvanometer of digitized SCR rectifier input, be used for second control signal of harmonic current compensation in the back output conduct of negating; With the voltage control signal generation unit; It is similar to the SCR Drive and Control Circuit; For example can comprise IGBT voltage and current double closed-loop control circuit, generate the 3rd control signal that is used to regulate output voltage U dc2 according to digitized output voltage U dc2 and digitized IGBT rectifier input electric current.Through the phase place that the input current that makes the IGBT rectifier is followed the tracks of the AC side input voltage, can control the input power factor of IGBT rectifier.The second and the 3rd control signal is sent to second pulse-modulated signal produces circuit; Second pulse-modulated signal produces circuit and modulates through utilizing these two control signal pulse signals; The IGBT driving pulse Driver2 that is used to drive the IGBT rectifier is exported in for example pulse width modulation.
In one embodiment, the harmonic wave control signal generating unit can also be calculated the idle component of the fundametal compoment of this electric current according to the galvanometer of digitized SCR rectifier input, then it is joined in second control signal, with compensating power.
Each embodiment that more than describes relates to uninterrupted power supply.It will be appreciated by those skilled in the art that rectification circuit according to the present invention is not limited to the rectification circuit that adopts among the UPS, it can be applied to fields such as motor frequency change speed regulator, mains lighting supply, Switching Power Supply.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (14)
1. rectification circuit that is used for the alternating voltage of power supply output is converted into direct voltage, this rectification circuit comprises:
Its input connects the controllable silicon SCR rectifier of said power supply;
Its former limit connects the transformer of the input of said power supply and said SCR rectifier;
Hf rectifier, its input connects the secondary of said transformer, with and output be connected in series the output of said SCR rectifier so that export said direct voltage through the series connection of said SCR rectifier and said hf rectifier; With
Commutation controller; Its electric current sum according to the former limit of the electric current of the input of the inflow SCR rectifier that is detected and inflow transformer is calculated the harmonic current that flows into said rectification circuit; Perhaps the electric current according to the input of the inflow SCR rectifier that is detected calculates the harmonic current that flows into said SCR rectifier, and produces and the opposite harmonic current of harmonic current that is calculated according to the harmonic current control hf rectifier that is calculated.
2. rectification circuit according to claim 1; Wherein said commutation controller detects said direct voltage; And according to the direct voltage control SCR rectifier that is detected, the direct voltage that said SCR rectifier and said hf rectifier series connection back is exported is a desired voltage values.
3. rectification circuit according to claim 2; Wherein said commutation controller also detects the output voltage of said SCR rectifier; And control said SCR rectifier and said hf rectifier according to the output voltage of direct voltage that is detected and said SCR rectifier, the direct voltage that said SCR rectifier and said hf rectifier series connection back is exported is a desired voltage values.
4. rectification circuit according to claim 3, the electric current sum on the electric current of the electric current of the input of wherein said commutation controller detection inflow SCR rectifier and the input of inflow SCR rectifier and the former limit of inflow transformer, said commutation controller comprises:
First control circuit, it produces first control signal that is used to regulate this output voltage according to the output voltage of the SCR rectifier that is detected and the electric current of the input that flows into the SCR rectifier;
First pulse-modulated signal produces circuit, and it generates first drive signal that is used to drive the SCR rectifier according to first control signal;
Second control circuit; Its electric current according to the input of the inflow SCR rectifier that is detected produces second control signal that is used for harmonic current compensation; And according to the output voltage of the direct voltage that is detected, SCR rectifier, flow into electric current and the electric current sum on former limit of electric current and inflow transformer that flows into the input of SCR rectifier of the input of SCR rectifier, produce the 3rd control signal of the output voltage that is used to regulate hf rectifier; And
Second pulse-modulated signal produces circuit, and it generates second drive signal that is used to drive hf rectifier according to the second and the 3rd control signal.
5. according to the described rectification circuit of one of claim 1-4, wherein said hf rectifier is full-bridge insulated gate bipolar transistor IGBT rectifier or full-bridge metal oxide semiconductor transistor MOS rectifier.
6. according to the described rectification circuit of one of claim 1-4, wherein said transformer is a step-down transformer.
7. according to the described rectification circuit of one of claim 1-4, wherein said rectification circuit also comprises inductance, and said inductance is connected between the input of secondary and hf rectifier of transformer.
8. rectification circuit according to claim 7, wherein said inductance are a plurality of inductance, and said a plurality of inductance are connected in series, and the mode through hot plug is connected between the input of secondary and hf rectifier of transformer.
9. according to the described rectification circuit of one of claim 1-4, wherein said rectification circuit also comprises the ac filter electric capacity of the secondary that is connected said transformer.
10. rectification circuit according to claim 9, wherein said ac filter electric capacity are a plurality of ac filter electric capacity, and said a plurality of ac filter electric capacity are connected in parallel, and are connected the secondary of said transformer through the mode of hot plug.
11. according to the described rectification circuit of one of claim 1-4; Wherein said rectification circuit also comprises first electric capacity and second electric capacity; Said first electric capacity is connected between two outputs of SCR rectifier, and said second electric capacity is connected between two outputs of hf rectifier.
12. uninterrupted power supply; Comprise according to the described rectification circuit of one of claim 1-11, storage battery and inverter; The direct voltage of said rectification circuit output is a charge in batteries, and said inverter is an alternating current with the direct voltage inversion of rectification circuit output.
13. uninterrupted power supply according to claim 12, wherein, said direct voltage carries out equal floating charge to said storage battery.
14. uninterrupted power supply according to claim 12, wherein, said commutation controller reduces the direct voltage of SCR rectifier output through phase shifting control.
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| CN104202886A (en) * | 2014-09-19 | 2014-12-10 | 英飞特电子（杭州）股份有限公司 | Thyristor holding current compensation circuit |
| CN104377947A (en) * | 2014-12-11 | 2015-02-25 | 北京乐普四方方圆科技股份有限公司 | Frequency converter harmonic wave elimination method and frequency converter harmonic wave elimination device |
| CN106452067A (en) * | 2016-10-08 | 2017-02-22 | 中国科学院光电研究院 | Balloon-borne power converter for tethered balloon |
| CN111756268A (en) * | 2019-03-27 | 2020-10-09 | 大连新大路电气传动技术有限责任公司 | Large-capacity reversible DC power supply with fast transition of output voltage |
| CN114559851A (en) * | 2022-03-08 | 2022-05-31 | 深圳易能时代科技有限公司 | Charging method and system for improving current density |
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| CN104202886A (en) * | 2014-09-19 | 2014-12-10 | 英飞特电子（杭州）股份有限公司 | Thyristor holding current compensation circuit |
| CN104202886B (en) * | 2014-09-19 | 2016-07-27 | 英飞特电子（杭州）股份有限公司 | A kind of controllable silicon maintains current compensation circuit |
| CN104377947A (en) * | 2014-12-11 | 2015-02-25 | 北京乐普四方方圆科技股份有限公司 | Frequency converter harmonic wave elimination method and frequency converter harmonic wave elimination device |
| CN106452067A (en) * | 2016-10-08 | 2017-02-22 | 中国科学院光电研究院 | Balloon-borne power converter for tethered balloon |
| CN106452067B (en) * | 2016-10-08 | 2019-03-15 | 中国科学院光电研究院 | A ball-on-board power converter for tethered balloons |
| CN111756268A (en) * | 2019-03-27 | 2020-10-09 | 大连新大路电气传动技术有限责任公司 | Large-capacity reversible DC power supply with fast transition of output voltage |
| CN114559851A (en) * | 2022-03-08 | 2022-05-31 | 深圳易能时代科技有限公司 | Charging method and system for improving current density |
| CN114559851B (en) * | 2022-03-08 | 2023-07-07 | 深圳易能时代科技有限公司 | Charging method and system for improving current density |
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| CN102684513B (en) | 2016-02-03 |
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