CN102170237B - High-voltage variable frequency power source - Google Patents
High-voltage variable frequency power source Download PDFInfo
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- CN102170237B CN102170237B CN 201110104413 CN201110104413A CN102170237B CN 102170237 B CN102170237 B CN 102170237B CN 201110104413 CN201110104413 CN 201110104413 CN 201110104413 A CN201110104413 A CN 201110104413A CN 102170237 B CN102170237 B CN 102170237B
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Abstract
The invention provides a high-voltage variable frequency power source, comprising power transformers (PTs) and linear variable frequency units in one-to-one correspondence, wherein each PT is used for independently supplying power for the linear variable frequency unit corresponding to the PT; each linear variable frequency unit is provided with a front output end and a back output end; and the output ends between the adjacent linear variable frequency units are connected in series in an end-to-end mode. The high-voltage variable frequency power source also comprises central processing units (CPUs) which are respectively connected with each linear variable frequency unit and used for carrying out communication control on the linear variable frequency units. By using the high-voltage variable frequency power source, a low-frequency voltage below a power frequency can be output and the size of the output voltage is not restricted.
Description
Technical field
The present invention relates to instrument field, in particular to a kind of high-pressure frequency-conversion power supply.
Background technology
The high-pressure frequency-conversion power supply of high accuracy, high stable is a global problem always.At present, the high-pressure frequency-conversion power supply generally adopts the mode of the external step-up transformer of low-voltage variable frequency power supply to realize.The low-voltage variable frequency power supply is divided into simulation variable frequency power supply and two kinds of forms of digital frequency conversion power supply, the power output plumber of simulation variable frequency power supply does to regulate output voltage at linear condition by the impedance of adjusting power tube, and its power output pipe of digital frequency conversion power supply is operated on off state and recently regulates output voltage by the duty of adjusting power tube.Degree of regulation height, the stability of simulation variable frequency power supply are good, and the distortion of output AC voltage is little, but efficient is low.The efficient of digital frequency conversion power supply is very high, but the output waveform distortion is big, and precision and stability all are difficult to accomplish very high.Because therefore the withstand voltage restriction of power output pipe no matter be that simulation variable frequency power supply or digital frequency conversion power supply all can not be realized very high-tension output.
In the correlation technique, can a plurality of power output pipes be together in series improve withstand voltage.Yet, if the power tube of series connection has only two to three to realize than being easier to, but when the power tube of connecting during more than three, the inconsistency of power tube has just demonstrated fully out, usually cause the power tube unbalanced-voltage-division of series connection, thereby influenced the reliability of system greatly.And the isolation drive of the power tube of series connection can't realize too much, so can not rely on unconfined series connection power tube to export high voltage arbitrarily.
Adopt the scheme of external step-up transformer, though can get the voltage lifting very highly, because the frequency characteristic of step-up transformer, limited the frequency of output voltage.Especially when the low-frequency voltage of output below the 50Hz step-up transformer be easy to saturated, so can't pass through step-up transformer output low frequency high voltage.And along with power electronic equipment especially frequency conversion equipment uses in a large number, urgent to the low frequency high voltage requirements of 0～50Hz.Market presses for can be at the power supply of the following scope output of frequency conversion scope especially power frequency high precision high stability degree ac high voltage.
Summary of the invention
Not high enough at correlation technique mesohigh variable frequency power supply output voltage, output frequency is the wide problems such as the following low-frequency voltage of power frequency of especially can not exporting inadequately, the invention provides a kind of high-pressure frequency-conversion power supply, one of to address the above problem at least.
According to the present invention, provide a kind of high-pressure frequency-conversion power supply.
High-pressure frequency-conversion power supply according to the present invention comprises: power transformer and linear converter unit one to one, wherein, each power transformer is used to the linear converter unit corresponding with it independently-powered, each linear converter unit all has two outputs of head and the tail, and the output between each linear converter unit is the head and the tail polyphone successively; CPU is connected with each linear converter unit respectively, is used for linear converter unit is communicated control.
By the present invention, adopting power transformer T1～Tn is that n linear converter unit C1～Cn isolates power supply respectively, and output A1, B1～An, the Bn of n linear converter unit joined end to end successively.It is not high enough to have solved correlation technique mesohigh variable frequency power supply output voltage, and output frequency is wide inadequately especially can not export problem such as the following low-frequency voltage of power frequency, and then can export the following low-frequency voltage of power frequency, and output voltage is big or small unrestricted.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not constitute improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the circuit theory diagrams according to the high-pressure frequency-conversion power supply of the embodiment of the invention;
Fig. 2 is the structured flowchart of CPU according to the preferred embodiment of the invention;
Fig. 3 is the structured flowchart of linear converter unit according to the preferred embodiment of the invention;
Fig. 4 is the circuit theory diagrams of the high-pressure frequency-conversion power supply of the example according to the present invention.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Fig. 1 is the circuit theory diagrams according to the high-pressure frequency-conversion power supply of the embodiment of the invention.As shown in Figure 1, this high-pressure frequency-conversion power supply comprises: power transformer T1, T2, T3...Tn and linear converter unit C1, C2, C3...Cn are (wherein one to one, the corresponding linear converter unit C1 of power transformer T1, the corresponding linear converter unit C2 of power transformer T2, the corresponding linear converter unit C3 of power transformer T3, ..., the corresponding linear converter unit Cn of power transformer Tn); And CPU D.
Wherein, each power transformer is used to the linear converter unit corresponding with it independently-powered (for example, the linear converter unit C1 power supply of power transformer T1 correspondence, the linear converter unit C2 power supply of power transformer T2 correspondence, ..., the linear converter unit Cn power supply of power transformer Tn correspondence), each linear converter unit (for example all has two outputs of head and the tail, the first output terminals A 1 of linear converter unit C1, tail output B1; The first output terminals A 2 of linear converter unit C2, tail output B2; ...; The first output terminals A n of linear converter unit Cn, tail output Bn), output between each linear converter unit head and the tail successively (is for example contacted, the tail output B1 of linear converter unit C1 and the first output terminals A of linear converter unit C2 2 polyphones, the tail output B2 of linear converter unit C2 and the first output terminals A of linear converter unit C3 3 polyphones, by that analogy, until the tail output B (n-1) of linear converter unit C (n-1) and the first output terminals A n polyphone of linear converter unit Cn).
Above-mentioned CPU D is connected with each linear converter unit respectively, is used for linear converter unit C1, C2, C3...Cn are communicated control.
In the correlation technique, a plurality of power output pipes be together in series improve withstand voltage, when the power tube of series connection during more than three, the inconsistency of power tube has just demonstrated fully out, usually cause the power tube unbalanced-voltage-division of series connection, thereby influenced the reliability of system greatly, so can not rely on unconfined series connection power tube to export high voltage arbitrarily.Adopt the scheme of external step-up transformer, though can get the voltage lifting very highly, because the frequency characteristic of step-up transformer, limited the frequency of output voltage.In high-pressure frequency-conversion power supply as shown in Figure 1, output A1, B1～An, the Bn of n linear converter unit are joined end to end successively, it is not high enough to have solved correlation technique mesohigh variable frequency power supply output voltage, output frequency is the wide problems such as the following low-frequency voltage of power frequency of especially can not exporting inadequately, and then can export the following low-frequency voltage of power frequency, and output voltage is big or small unrestricted.
Preferably, each power transformer is isolated mutually.In specific implementation process, usually adopting the higher power transformer of isolation is that linear converter unit is independently-powered one to one with it, so be isolated from each other between the output of each linear converter unit, output A1, B1～An, the Bn with n linear converter unit joins end to end then.CPU D links to each other by optical fiber group F and n linear converter unit, and n linear converter unit carried out Communication Control, and amplitude, frequency and the phase information of same sinusoid fiducial signal sent to the individual linear converter unit of n.So with the sinusoidal voltage of equal value, n linear converter unit back that joins end to end is the linear superposition of each unit output in the total output of A1Bn to the linear converter unit output of n with frequently.
By above-mentioned processing, the output voltage size of above-mentioned high frequency variable frequency power supply is unrestricted, and the output signal frequency scope is wideer, especially can export the following low frequency frequency of power frequency, stable output signal is good, precision is high, distortion is little, and it is easy to maintenance to adopt cellular construction to produce.
Preferably, above-mentioned CPU D can be connected with each linear converter unit C1, C2, C3...Cn respectively by the optical fiber group.
Wherein, above-mentioned optical fiber group comprises a plurality of optical fiber, and CPU is connected with each linear converter unit C1, C2, C3...Cn by in a plurality of optical fiber at least one.
In preferred implementation process, CPU D is connected with each linear converter unit by two optical fiber respectively.Wherein, an optical fiber is used for transferring to a linear converter unit from the signal of CPU D, and another optical fiber is used for transferring to CPU D from the signal of this linearity converter unit.Specifically can be referring to Fig. 4.
Preferably, as shown in Figure 2, CPU D may further include: microprocessor 20, be used for obtaining the predetermined sinusoidal signal message, and wherein, sinusoidal signal information comprises: amplitude information, frequency information, phase information; The first optical fiber transceiver module 22 is connected with microprocessor, be used for the predetermined sinusoidal signal message is sent to each linear converter unit by the optical fiber group, and the information that will come from each linear converter unit feeds back to microprocessor by the optical fiber group.
Preferably, microprocessor D1 can be for single-chip microcomputer or digital signal processor general little process chip such as (Digital Signal Processor abbreviate DSP as), as long as possess basic calculating and serial communication function.
Preferably, as shown in Figure 2, above-mentioned CPU D can also comprise: Subscriber Interface Module SIM 24, be connected with microprocessor, and be used for receiving the above-mentioned predetermined sinusoidal signal message of user's input; And display module 26, be connected with microprocessor, be used for showing above-mentioned predetermined sinusoidal signal message.
Preferably, as shown in Figure 3, each linear converter unit all can comprise: power conversion module 30, be connected with power transformer, and the output generation direct voltage that is used for according to power transformer is the power supply of linear power amplification module; The second optical fiber transceiver module 32 is used for coming from the predetermined sinusoidal signal message of CPU by optical fiber winding receipts, and is sent to the numerical frequency synthesis module; Numerical frequency synthesis module 34 is connected with the second optical fiber transceiver module, is used for the predetermined sinusoidal signal message is converted to the sinusoidal signal corresponding with this sinusoidal signal information; Linear power amplification module 36 is connected with numerical frequency synthesis module 34, for the sinusoidal signal of correspondence being amplified and exporting.
Below in conjunction with Fig. 4 above-mentioned preferred implementation is described.
Fig. 4 is the circuit theory diagrams of the high-pressure frequency-conversion power supply of the example according to the present invention.As shown in Figure 4, T1～Tn represents to have the higher power transformer of dielectric strength, and C1～Cn represents the identical linear converter unit of internal circuit configuration, and A1, B1, A2, B2～An, Bn are the two poles of the earth output of each linear converter unit, wherein, be that example describes with n=10 among Fig. 4.CPU D can be made of microprocessor 20, optical fiber transceiver module 22, display module 26, Subscriber Interface Module SIM 24 etc., and universal serial bus transmitting terminal TXD and the receiving terminal RXD of microprocessor 20 are connected optical fiber sending module DT1～DT10 and optic fiber transceiver module DR1～DR10 respectively.Linear converter unit is connected to CPU D by optical fiber group F, and each linear converter unit is connected to CPU D by at least one optical fiber.In this example, each linear converter unit is connected to CPU D by two optical fiber, is respectively F11, F12～F101, F102.
In this example, linear converter unit C1 is by power conversion module 30, and part such as numerical frequency synthesis module 34, linear power amplification module 36 and optical fiber transceiver module 32 (may further include: optic fiber transceiver module UR1 and optical fiber sending module UT1) constitutes.The internal circuit configuration of other linear converter units (C2, C3...C10) can be identical with linear converter unit C1, certainly, in specific implementation process, also can adopt other circuit structures with linear frequency conversion function.
High-pressure frequency-conversion power supply shown in Figure 4 is obtained by 10 identical linear converter unit C1～C10 output head and the tail series connection of structure.Therefore this high-pressure frequency-conversion power supply can be exported ten times of voltages of linear converter unit output voltage.By Subscriber Interface Module SIM, the user can import the information such as frequency, amplitude and phase place of predetermined output voltages to microprocessor 20, and can show relevant informations by display module 26.
In specific implementation process, microprocessor 20 can adopt general-purpose microprocessor chips such as single-chip microcomputer or DSP, as long as possess basic calculating and serial communication function.Universal serial bus transmitting terminal TXD and the receiving terminal RXD of microprocessor 20 are connected optical fiber sending module DT1～DT10 and optic fiber transceiver module DR1～DR10 respectively, send frequency, amplitude and the phase information of same output voltage to each linear converter unit by optical fiber group F.
Because linear converter unit structure is identical, below only illustrate with linear converter unit C1: the T1 isolating transformer is input as AC220V, and the output double winding is connected to power conversion module V1, the direct voltage of generation ± 100V.The direct voltage of ± 100V is linear power amplification module 36 (for example, the high-voltage high-speed power operational amplifier PA78 of APEX company) power supply.The input signal of linear power amplification module 36 is produced by numerical frequency synthesis module 34 (for example, the AD9854 of AD company).Numerical frequency synthesis module 34 is connected on optical-fibre communications bus F11, the F12 by optical fiber transceiver module 32 (UR1, UT1).Link to each other with CPU D by fiber buss F11, F12.CPU D is needing frequency, amplitude and the phase information of output voltage to pass to numerical frequency synthesis module 34 by fiber buss F11, F12, numerical frequency synthesis module 34 changes into analog signal with the digital information that receives, this analog signal is the sinusoidal signal of said frequencies information, amplitude information and phase information correspondence, and linear power amplification module 36 further amplifies output with this sinusoidal signal again.So linear converter unit C1 just can export 0～100V with the sinusoidal voltage of interior assigned frequency and phase place.Linear converter unit C1 to C10 is connected from beginning to end, and namely exportable 0～1000V is with the sinusoidal voltage of interior assigned frequency and phase place, and the distortion factor of output sinusoidal voltage is very low, and load capacity is also very strong.
From above description, as can be seen, the present invention has realized following technique effect: the structure of having simplified the high-pressure frequency-conversion power supply, only need the linear converter unit of simple series connection respective number just can export high voltage arbitrarily, almost there is not the ceiling voltage restriction, improve reliability of products greatly, reduced the production maintenance cost.Because variable frequency power supply output does not have transformer or filter, but Linear Power Amplifier output so output waveform quality better, distortion are low, wide frequency range, can be exported the following ULF of power frequency 50Hz, response is fast, load capacity is strong, is easy to realize the frequency conversion output of high precision high stability.Be well worth doing at aspects such as frequency conversion test, frequency conversion meterings.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, carried out by calculation element thereby they can be stored in the storage device, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a high-pressure frequency-conversion power supply is characterized in that, comprising:
Power transformer and linear converter unit one to one, wherein, each described power transformer is used to the linear converter unit corresponding with it independently-powered, each described linear converter unit all has two outputs of head and the tail, wherein the tail output of the first output of first linear converter unit and last linear converter unit has constituted the output of high-pressure frequency-conversion power supply, and all the other outputs between each described linear converter unit are the head and the tail polyphone successively;
CPU is connected with each described linear converter unit respectively, is used for described linear converter unit is communicated control;
Wherein, described CPU is connected with each described linear converter unit respectively by the optical fiber group;
Described CPU comprises: microprocessor, be used for obtaining the predetermined sinusoidal signal message, and wherein, described sinusoidal signal information comprises: amplitude information, frequency information, phase information; The first optical fiber transceiver module, be connected with described microprocessor, be used for described predetermined sinusoidal signal message is sent to each described linear converter unit by described optical fiber group, and the information that will come from each described linear converter unit feeds back to described microprocessor by described optical fiber group;
Each described linear converter unit includes: the power conversion module, be connected with described power transformer, and the output generation direct voltage that is used for according to described power transformer is the power supply of linear power amplification module; The second optical fiber transceiver module is used for coming from the described predetermined sinusoidal signal message of described CPU by described optical fiber winding receipts, and is sent to the numerical frequency synthesis module; Described numerical frequency synthesis module is connected with the described second optical fiber transceiver module, is used for described predetermined sinusoidal signal message is converted to the sinusoidal signal corresponding with this sinusoidal signal information; Described linear power amplification module is connected with described numerical frequency synthesis module, for the sinusoidal signal of described correspondence being amplified and exporting.
2. high-pressure frequency-conversion power supply according to claim 1 is characterized in that, each described power transformer is isolated mutually.
3. high-pressure frequency-conversion power supply according to claim 1 is characterized in that, described optical fiber group comprises a plurality of optical fiber, and described CPU is connected with each described linear converter unit by in described a plurality of optical fiber at least one.
4. high-pressure frequency-conversion power supply according to claim 3 is characterized in that, described CPU is connected by the described linear converter unit of two optical fiber and each.
5. high-pressure frequency-conversion power supply according to claim 1 is characterized in that, described microprocessor is single-chip microcomputer or digital signal processor DSP.
6. high-pressure frequency-conversion power supply according to claim 1 is characterized in that, described CPU also comprises:
Subscriber Interface Module SIM is connected with described microprocessor, is used for receiving the described predetermined sinusoidal signal message of user's input;
Display module is connected with described microprocessor, is used for showing described predetermined sinusoidal signal message.
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| CN 201110104413 CN102170237B (en) | 2011-04-25 | 2011-04-25 | High-voltage variable frequency power source |
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| CN104374963A (en) * | 2014-11-04 | 2015-02-25 | 国网河南省电力公司电力科学研究院 | Variable-frequency power source device for high voltage tests |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2666031Y (en) * | 2003-11-26 | 2004-12-22 | 山东风光电子有限责任公司 | Five-levels bidirectional inverted middle and high voltage frequency conversion power supply device |
| US7219673B2 (en) * | 2004-08-25 | 2007-05-22 | Curtiss-Wright Electro-Mechanical Corporation | Transformerless multi-level power converter |
| CN202043046U (en) * | 2011-04-25 | 2011-11-16 | 湖南银河电气有限公司 | High-voltage variable frequency power source |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2666031Y (en) * | 2003-11-26 | 2004-12-22 | 山东风光电子有限责任公司 | Five-levels bidirectional inverted middle and high voltage frequency conversion power supply device |
| US7219673B2 (en) * | 2004-08-25 | 2007-05-22 | Curtiss-Wright Electro-Mechanical Corporation | Transformerless multi-level power converter |
| CN202043046U (en) * | 2011-04-25 | 2011-11-16 | 湖南银河电气有限公司 | High-voltage variable frequency power source |
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