CN1032607A - " comparison-tracking-amplification " formula frequency converter - Google Patents
" comparison-tracking-amplification " formula frequency converter Download PDFInfo
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- CN1032607A CN1032607A CN 87106881 CN87106881A CN1032607A CN 1032607 A CN1032607 A CN 1032607A CN 87106881 CN87106881 CN 87106881 CN 87106881 A CN87106881 A CN 87106881A CN 1032607 A CN1032607 A CN 1032607A
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Abstract
The invention discloses a kind of AC-DC-AC type frequency converter of in AC variable-frequency speed regulation system, using, converter main circuit in this frequency converter disposes the working link of some adaptation high-voltage great-current service requirements again by comparison-tracking self-oscillation power supply and traditional Class B power amplification circuit and constitutes, thereby has obtained the effectiveness of high-efficiency inversion.Such frequency converter can make cage type asynchronous machine obtain the quasi sine supply waveform, and system effectiveness is suitable with the SPWM frequency conversion system.The present invention has also disclosed a representative instance and has executed.
Description
This device belongs to the electric drive field, is the application of Semiconductor Converting Technology in AC variable-frequency speed regulation system.The mode that realizes frequency control at present mainly is divided into two big classes: AC-AC frequency conversion and ac-dc-ac inverter.This device belongs to back one big class.
In the AC frequency conversion electric drive system, following requirement is proposed frequency converter: the 1. efficient height of device own; 2. little to power factor of electric network height, harmonic pollution; 3. output voltage, current waveform As soon as possible Promising Policy load request; 4. circuit is simple, control is convenient.In recent years, all kinds of ac-dc-ac frequency converters but are difficult to topped whole requirement by above-mentioned requirements development rapidly, often satisfy wherein two, three and obtain suitable range of application with outstanding.For example: with common controllable silicon is all kinds of voltage-types, the current-mode converter of main commutation components and the SPWM frequency converter that just develops.The SPWM frequency converter is that than other frequency converter is mainly progressive the inversion efficiency of SPWM type inverter and sinusoidal degree improve a lot, but its supply waveform to cage type asynchronous machine also only is a sinusoidal modulation wave, be not real sine wave, the requirement of this and load also has a certain distance.
Aim of the present invention is: seek the new type inverter scheme in the following AC variable-frequency speed regulation system of 100KVA, this frequency converter has breakthrough than the SPWM frequency converter on the waveform index of output, can make cage type asynchronous machine obtain the supply waveform of quasi sine, and do not fall end system effectiveness substantially, thereby industrial application value improves.
The present invention is illustrated from several aspects.
1. inversion control thought of the present invention:
By aforementioned requirement to the frequency converter performance index, be conceived to the inverter in the frequency converter be developed when efficient to switching mode, SPWM type inverter belongs to this type of, and its waveform index is still undesirable; If be conceived to traditional power amplification circuit, the undistorted high-quality waveform that can obtain amplifying, but circuit efficiency is low, classical power electronics theoretical proof, even Class B power amplification circuit, its efficient can not surpass 78.5% yet, does not therefore have industrial application value in high pressure, large-current electric gas transmission field.The inventor proposes to make switching circuit to combine with traditional Class B power amplification circuit, so just, efficiency index and output waveform index hold concurrently excellent novel inversion control thought and corresponding device thereof-comparison (Compare)-tracking (Track)-amplification (Amplify) formula inverter, i.e. CTA inverter in apparatus of the present invention thereof have been produced.Its in conjunction with schematic diagram shown in figure one.Wherein main circuit is made of comparison-tracking mode self-oscillation power supply (E) and traditional Class B power amplification circuit (F), and two anti-phase half-waves that the former f-f ' end phase difference output is 180 ° are as the latter's power supply; Both are by same sine signal source (7) control, and output produces the undistorted voltage waveform V0 that is exaggerated.Because f-f ' end is not a DC power supply, so back level loss seldom.1. this basic model originates from document, press authors' name in this manual with called after S-K model in figure one frame of broken lines, with the basic circuit called after S-K circuit of document in 1., with the inventor according to the inversion needs with adapt to the high-voltage great-current service requirement and introduce the circuit that forms after other link and be called distortion S-K circuit.Here statement: document 1. the author to use the aim that S-K circuit and the inventor use distortion S-K circuit be diverse, the former amplifies audio signal for efficient, and the latter is for high-efficiency inversion.The reason of latter's high-efficiency inversion is: be added in supply voltage on back level power amplification circuit (F) triode and be the little sawtooth sine wave with sine signal source (7) same frequency, thereby tube voltage drop minimum, avoided adding the such high tube voltage drop situation of DC power supply, shown in figure two,, the efficient of Class B power amplification circuit is no more than 78.5% theoretical forbidden zone thereby having been broken through.
2. frequency converter operation principle of the present invention:
Figure three is an exemplary embodiments of apparatus of the present invention, wherein (A), (B), (C) three inverters are formed the CTA three-phase inverter, (7) can be a common three-phase sinusoidal signal source, present embodiment has adopted the CTA signal source of inventor's design, and the CTA frequency converter is formed in (A), (B), (C), (7).(P) is the diode rectification filter, and (M) is cage type asynchronous machine.
Figure four is the specific of B phase inverter among the figure three.Switch S among the figure four
1, S
' 1, self-oscillation inductance L, L ', sustained diode, D ', self-oscillation capacitor C 2, C
' 2, power amplification triode T1, T
' 1And comparator (3), (3 ') are formed and 1. roughly the same S-K circuit of document; The present invention is according to the high-voltage great-current characteristics with to the specific (special) requirements of signal source, on basic S-K circuit, set up following link: ratio detector (1), (1 '), linear photoconductor is isolated sampler (2), (2 '), switching regulator photoisolator (4), (4 ') and soft starter (8) have constituted distortion S-K circuit with this, and have disposed CTA three-phase sinusoidal signal source (7) for this reason.
In addition, for reducing the ring width of winding characteristic, anti-phase input is adopted in the comparator (3) of this distortion S-K circuit, (3 '), and no regenerative circuit is with the emerging of basic S-K circuit Zhen! 7), (17 ') be the gate circuit of current limit signal control, plays protection switch S
1, S
' 1Effect.
The course of work of figure four (B phase inverter) is as follows:
Non-adjustable direct voltage behind the three-phase diode rectifying and wave-filtering is added on the e-e ' two ends of self-oscillating circuit, and adjustable sinusoidal signal is added on comparator (3), (3 ') Vref end.At Vref end during for sinusoidal wave positive half cycle, the first half work of this circuitry phase and the latter half is not worked.The first half course of work is: the sampled signal that is directly proportional with the f terminal voltage promptly (3) go into terminal voltage (by (1), (2)) less than the amplitude of reference sinusoidal voltage the time, comparator (3) output one positive level makes switch S 1 closure through switching regulator photoisolator (4) and driver (5); Electric current is through L, C2 charging, and the f terminal voltage raises, and the terminal voltage of going into of (3) also raises simultaneously, when it was higher than with reference to the sinusoidal voltage instantaneous value, comparator (3) output one negative level ended switch S 1 through (4), (5), energy on the L is through C2, D afterflow, and f end output voltage descends.Circulation and so forth, in the positive half cycle of reference sinusoidal voltage, S1 replaces break-make, and the f end obtains riding over half waveform (shown in figure five) on the standard sine signal, and its frequency of oscillation is the frequency that the switching frequency of S1 should be higher than sinusoidal reference signal far away.In like manner, when the Vref end is sinusoidal wave negative half period, can obtain f ' end output voltage waveforms.
Vff ' is the output waveform of self-oscillating circuit among the figure five, and to traditional Class B power amplification circuit (F) power supply, then the Class B power amplifier produces the quasi sine waveform V with reference to the undistorted amplification of sinusoidal quantity in load with it
0T1, T
' 1Pipe is operated between the critical saturated and magnifying state, and its cloudy latent part is a tube voltage drop, and traditional Class B power amplifier of consequent pipe loss-rate direct current supply is much smaller.(6), (6 ') are driver for isolating.
A phase, C phase inverter case are identical with B phase inverter.Three symmetrical sinusoidal output voltages are powered to the three-phase cage asynchronous machine, change the velocity setting value and can change frequency of supply and voltage, realize frequency control.Because this device has one by the Quality Initiative of comparing element to switching device, produce and follow reference signal and the output voltage waveforms V0 of undistorted amplification, " comparison-tracking-amplification " the formula frequency converter that hence obtains one's name is called for short the CTA frequency converter.
3. the CTA signal source in the exemplary embodiments of the present invention:
CTA signal source in the present embodiment is to satisfy below the fundamental frequency 50HZ, Vs/fs=const(Vs is the sinusoidal signal voltage magnitude, fs is a signal frequency) and have low-frequency compensation, more than the fundamental frequency 50HZ, the special three-phase sinusoidal signal source of Vs=const under only the tracking that changes of fs requires.Consider many-sided requirements such as performance index such as tuning range, the distortion factor and interference rejection ability, CTA signal source among the embodiment is a core link with the accurate function generator monolithic of 5G8038, dispose other element again, realized by the differentiation of single-phase, the permanent width of cloth, the controlled sinusoidal signal of frequency to three-phase amplitude-frequency tracking sine signal source.
Schematic diagram below in conjunction with figure six CTA signal sources illustrates it:
Signal source A ' with A phase inverter is example mutually, the g pin of accurate function generator 5G8038 monolithic (9) produces the constant amplitude sinusoidal signal, remove " side's point synchronously " of negative half period through capacitance C4a, negative amplitude limit electrical equipment (13), obtain the constant amplitude sinusoidal signal of standard at a ' that goes into to hold of analog multiplier (14).The i pin of 5G8038 monolithic (9) is the voltage-controlled end of frequency, and as the input of function generator (15), " low-frequency compensation " solves by (15) inner off-centre circuit, more than the fundamental frequency 50HZ, and Vs=const, the amplitude limit link inner by (15) solves.(15) be output as three analog multipliers (14), (14 '), (14 ") provide multiplier signal-the have voltage signal of low-frequency compensation and fundamental frequency amplitude limit output characteristic simultaneously, and multiplied result can be in (14), (14 '), (output of 14 ") is met the three-phase sine-wave that frequency control requires.Here a, b, c phase signals waveform should differ 120 ° of electrical degrees.Its implementation is: utilize triangular signal and 2/3 times of " triangle wave height " voltage (16) of the h pin output of signal source A ' phase 5G8038 monolithic (9) to compare at comparator (10), thereby produce a series of square-wave signals, this signal produces the burst pulse of aiming at this square wave rising edge through narrow-pulse generator (11), realizes being added to signal source B ' phase switch S after the level conversion through photoelectronic coupler (12) again
' 2The control utmost point, the charging process of B ' phase 5G8038 monolithic (9 ') can only be begun after A ' charges 120 ° of electrical degrees mutually, thereby sine wave also lags behind 120 °.(11) burst pulse can transfer to very narrow, S
' 2Switching speed is very high, and is little to the charge and discharge process influence.Phase repeats once synchronizing process weekly, avoided accumulated error, just the sinusoidal signal negative half period that produces at the g pin of B ' phase 5G8038 monolithic (9 ') is many " the little side point " of a stack, amplitude limiter circuit (13 ') can remove should " square sharp " and obtain the fiducial mark sinusoidal signal.This process can obtain explanation by the waveform of figure seven.
1. figure seven is the h pin waveform of signal source A ' phase 5G8038 monolithic (9);
2. figure seven is signal source A ' phase comparator (10) output waveform;
3. figure seven is signal source A ' phase narrow-pulse generator output waveform;
4. figure seven is the h pin waveform of signal source B ' phase 5G8038 monolithic (9 ');
5. figure seven is the g pin waveform of signal source B ' phase 5G8038 monolithic (9 ').
Obviously, (10) of signal source A ' phase, (11), (12) have constituted the synchronization control circuit of signal source B ', are understood that the three-phase synchronization principles of this signal source by the three-phase circulation connection of entire circuit.
For distinguishing mutually, as the signal source called after CTA signal source in the CTA frequency converter exemplary embodiments of the present invention with other types of signal sources.This signal source and A mutually, B phase, C phase three-phase inverter constitute the CTA frequency converter can real 100KVA with interior frequency control.Theory analysis and experiment have all proved its high efficiency and high-quality waveform.Its static exercise rate conversion efficiency can reach more than 95%, and only a little less than the SPWM frequency converter, but owing to be high-quality quasi sine power voltage supply, electric efficiency no longer reduces, so system total efficiency will be suitable with the SPWM system total efficiency, and does not have the low-speed torque ripple phenomenon.Obviously, the CTA frequency converter will obtain the wide industrial application in the alternating-current electric transmission field.Attached documents:
①A High-Efficiency Audio Power Amplifier Using a Self-Osciliating Switching Regulator
SEIGOH KASHIWAGI
IEEE Transaction IA NO.4 1985
Claims (2)
1, a kind of AC-DC-AC type frequency converter, it is made up of a three-phase inverter and a three-phase sinusoidal signal source, and feature of the present invention is that each the phase inverter in the three-phase inverter is to be made of following main devices: a comparison-tracking mode self-oscillation power supply, traditional Class B power amplification circuit, ratio detector [1] and [1 '], a linear photoconductor are isolated sampler [2] and [2 '], switching regulator photoisolator [4] and [4 '], soft starter [8].
2, frequency converter according to claim 1 is characterized in that the three-phase sinusoidal signal source is core link work with the accurate function generator monolithic of 5G8038.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87106881 CN1009983B (en) | 1987-10-10 | 1987-10-10 | "comparison-tracking-amplifying" type freq. converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87106881 CN1009983B (en) | 1987-10-10 | 1987-10-10 | "comparison-tracking-amplifying" type freq. converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1032607A true CN1032607A (en) | 1989-04-26 |
| CN1009983B CN1009983B (en) | 1990-10-10 |
Family
ID=4815878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87106881 Expired CN1009983B (en) | 1987-10-10 | 1987-10-10 | "comparison-tracking-amplifying" type freq. converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1009983B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102593961A (en) * | 2012-03-02 | 2012-07-18 | 天津工业大学 | Wireless power supply system for under-deepwater hydrographic survey |
| CN104851425A (en) * | 2015-05-30 | 2015-08-19 | 宁波摩米创新工场电子科技有限公司 | High-definition voice identification system based on symmetric triode amplification circuit |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100411293C (en) * | 2004-12-30 | 2008-08-13 | 山东大学 | Parabola method current tracking pulse width modulation controller |
-
1987
- 1987-10-10 CN CN 87106881 patent/CN1009983B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102593961A (en) * | 2012-03-02 | 2012-07-18 | 天津工业大学 | Wireless power supply system for under-deepwater hydrographic survey |
| CN104851425A (en) * | 2015-05-30 | 2015-08-19 | 宁波摩米创新工场电子科技有限公司 | High-definition voice identification system based on symmetric triode amplification circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1009983B (en) | 1990-10-10 |
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