CN101667790B - High power DA conversion circuit - Google Patents
High power DA conversion circuit Download PDFInfo
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- CN101667790B CN101667790B CN2009101530466A CN200910153046A CN101667790B CN 101667790 B CN101667790 B CN 101667790B CN 2009101530466 A CN2009101530466 A CN 2009101530466A CN 200910153046 A CN200910153046 A CN 200910153046A CN 101667790 B CN101667790 B CN 101667790B
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Abstract
A high power DA conversion circuit comprises a waveform generator and a changeable gain amplifier with the peripheries are connected sequentially, the changeable gain amplifier is also sequentially connected with an A/D conversion module, a delay driving module and a D/A conversion module, one or a plurality of independent DC power supply is correspondingly connected with the input end of the D/A conversion module, the output end of the D/A conversion module constitutes the output end of multilevel step wave. The invention applies D/A conversion technology in weak current control technology in high power conversion inverted power supply, can obtain more level number of step wave under less independent DC power supply number, and the circuit self has automatic voltage stabilization function, dispenses with PWM modulation and voltage regulation technology, simplifies the circuit, reduces the overall technical difficulty, has simple control, low switching frequency, trace switching loss of components, and can output complex waveform with small harmonic wave content and high circuit conversion efficiency.
Description
Technical field: the present invention relates to a kind of power transfer technology of power electronics, particularly high power conversion inverter circuit.
Background technology: the development and application in middle high-power electric system of single-phase at present, three phase frequency changing power and multi-electrical level inverter is rapid, but above conversion contravariant equipment is a core with PWM modulation voltage-regulating technique still now, and what utilize PWM technology inversion output is the square wave of change in duty cycle, has harmonic content height, motor harmonic noise and disturbs big shortcoming.Now the multi-level inverse conversion technology that is output as staircase waveform is arranged also, have that the output waveform distortion is little, harmonic content is low, the switching device operating frequency is low and advantage such as loss is low, and the level number of staircase waveform is many more, advantage is obvious more.Present multi-level inverse conversion technology ubiquity circuit structure complexity, the problem that switching device is many increases the staircase waveform level number of exporting if desired, must roll up the independent DC power supply number simultaneously, for making circuit control be unlikely to too complicated, generally can only be controlled to be 3-5 level.And using has the switching tube that directly is connected on both ends of power in a large number in the more cascaded inverter, and self does not have voltage stabilizing function, also need increase the PWM voltage-regulating system, complicated more.
DA switch technology in the light current control technology can only need less power supply number, can obtain more level number, the type of DA conversion mainly contains voltage output type, current-output type, take advantage of calculation type etc. several, but their circuit structure has determined these several circuit can only be used for the little current applications of small voltage.
Summary of the invention: at the deficiencies in the prior art, it is reasonable to the invention provides a kind of circuit structure, the more high power DA conversion circuit of staircase waveform level number of inversion output.
The present invention includes and be located at waveform generator and the variable gain amplifier that periphery is connected successively, variable gain amplifier also connects A/D modular converter, time-delay driver module and D/A modular converter successively, the then corresponding input that connects the D/A modular converter of one or more independent DC power supplies, the output of D/A modular converter then constitutes many level staircase waveform output.
The present invention is applied to the D/A switch technology in the light current control technology in the high power conversion inverter, under less independent DC power supply number, can obtain more staircase waveform level number, solve the situation that level number in the conventional multi-level inverse conversion topological method too much is difficult to increase because of power supply number and derailing switch number of packages.And circuit self possesses the automatic voltage regulation function, removed PWM modulation voltage-regulating technique, simplified circuit, reduced whole technical difficulty, control is simple, and switching frequency is low, and the devices switch loss is very little, can export complicated waveform, harmonic content is very little, circuit conversion efficient height.
General D/A modular converter is made up of many switch power spare and conducting power spares to the difference corresponding matching, the quantity of its logarithm and independent DC power supply is identical, and the on off state of the every pair of switch power spare and conducting power spare is opposite, and the circuit structure of D/A modular converter also can be adjusted variation certainly.
Output at the D/A modular converter generally is connected with the LC filter, can filter harmonic wave like this, obtains the more waveform of standard.Between the output of LC filter and variable gain amplifier, also can be connected with the amplitude detection feedback module, the amplitude information of output can feed back to variable gain amplifier, change the wave-shape amplitude of input A/D conversion, promptly change the data of A/D conversion output, also just changed input D/A data converted.
Further specify the present invention below in conjunction with drawings and Examples.
Description of drawings: Fig. 1 is a circuit block diagram of the present invention;
Fig. 2 is the circuit connecting line figure of the D/A modular converter of embodiment 1;
Fig. 3 is two D/A conversion connection diagrams of embodiment 1;
Fig. 4 is that the circuit of embodiment 2 connects block diagram;
Fig. 5 is the circuit connecting line figure of the D/A modular converter of embodiment 3.
Embodiment 1: present embodiment is single-phase variable frequency power supply, as shown in Figure 1, comprise the waveform generator, variable gain amplifier, A/D modular converter and the time-delay driver module that are located at periphery and are connected successively, the time-delay driver module connects the D/A modular converter, the then corresponding input that connects the D/A modular converter of one or more independent DC power supplies, the output of D/A modular converter also is connected with the LC filter, is connected with the amplitude detection feedback module between the output of LC filter and variable gain amplifier.
During work, waveform generator produces waveform, generally be sinusoidal wave, amplify through variable gain amplifier, signal is again through the conversion of A/D modular converter, and the signal of conversion can make spike reduce through the time-delay driver module, import many level of D/A modular converter conversion output step signal then, filter harmonic wave output through the LC filter again.The amplitude detection feedback module makes the amplitude information of output feed back to variable gain amplifier, changes the wave-shape amplitude of input A/D conversion, carries out from voltage stabilizing.
As shown in Figure 2, present embodiment adopts four independent DC power supplies (V1 to V4), independent DC power supply can be a plurality of independently storage batterys, also can be that a storage battery obtains a plurality of DC power supply via the DC-DC converter, perhaps can also produce many group independent DC power supplies respectively by a plurality of DC-DC converters with a storage battery.Form respectively by the switch power spare (S11 to S14) and the conducting power spare (S21 to S24) of corresponding matching by four pairs for the D/A modular converter, and the on off state of switch power spare S11 and conducting power spare S21 is opposite, the on off state of switch power spare S12 and conducting power spare S22 is opposite, by that analogy.Also be parallel with corresponding electric capacity (C1 to C4) on each independent DC power supply, inductance L 1 and capacitor C 5 are formed the LC filter, and 6 of capacitor C are jumbo partiting dc capacitor, connect load RL.As can be seen, the level number of D/A conversion inversion is 2
NIndividual, N is a D/A conversion figure place, i.e. independent DC power supply number, and present embodiment is 4.The power of high-order power supply is 3 times of a low power approximately as calculated, increases a D/A conversion so, as long as increase the power supply that relative power is very little, and the level number of exporting staircase waveform doubles.
If utilize two D/A conversion syndetons as shown in Figure 3, partiting dc capacitor C6 can remove, and is output as two alternating current stacks that the voltage equal phase is opposite, and the voltage transitions level down is at half so.
Embodiment 2: present embodiment is a three phase frequency changing power, and as shown in Figure 4, the flip-flop voltage of U, V, W three-phase D/A conversion output equates that the requirement of three phase mains work is just satisfied in this method of attachment.
Embodiment 3: present embodiment is a multi-electrical level inverter, as shown in Figure 5, adopt N independent DC power supply (V1 to Vn), the D/A modular converter is made up of many switch power spare (S11 to S1n) and conducting power spares (S21 to S2n) to the difference corresponding matching, logarithm is identical with the independent DC power supply number, and the on off state of the every couple of switch power spare S1n and conducting power spare S2n is opposite.What the D/A of present embodiment changed is the waveform of half-wave, and switch S 31, S32, S33 and S34 cooperate and form polarity switching, and the waveform signal after the power D/A conversion is synthesized complete sine wave by the half cycle conversion.The staircase waveform level number of output is 2
N+1-1, the level number of output is a lot, and harmonic wave is considerably less, the circuit efficiency height.
Claims (4)
1. high power DA conversion circuit, comprise and be located at waveform generator and the variable gain amplifier that periphery is connected successively, it is characterized by: variable gain amplifier also connects A/D modular converter, time-delay driver module and D/A modular converter successively, the then corresponding input that connects the D/A modular converter of one or more independent DC power supplies, the output of D/A modular converter then constitutes many level staircase waveform output.
2. high power DA conversion circuit according to claim 1, it is characterized by: the D/A modular converter is made up of many switch power spare and conducting power spares to the difference corresponding matching, the quantity of its logarithm and independent DC power supply is identical, and it is opposite to form the on off state of every pair switch power spare and conducting power spare.
3. high power DA conversion circuit according to claim 1 and 2 is characterized by: the output of D/A modular converter is connected with the LC filter.
4. high power DA conversion circuit according to claim 3 is characterized by: be connected with the amplitude detection feedback module between the output of LC filter and variable gain amplifier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101530466A CN101667790B (en) | 2009-09-25 | 2009-09-25 | High power DA conversion circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101530466A CN101667790B (en) | 2009-09-25 | 2009-09-25 | High power DA conversion circuit |
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| CN101667790A CN101667790A (en) | 2010-03-10 |
| CN101667790B true CN101667790B (en) | 2011-05-25 |
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| CN2009101530466A Expired - Fee Related CN101667790B (en) | 2009-09-25 | 2009-09-25 | High power DA conversion circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103078541B (en) * | 2013-01-17 | 2016-01-13 | 哈尔滨工业大学 | The Five-level voltage source inverter simplified |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201312267Y (en) * | 2008-10-31 | 2009-09-16 | 厦门拓宝科技有限公司 | Single-pole SPWM inverter power-source circuit |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201312267Y (en) * | 2008-10-31 | 2009-09-16 | 厦门拓宝科技有限公司 | Single-pole SPWM inverter power-source circuit |
Non-Patent Citations (1)
| Title |
|---|
| 夏守行.数字式三相变频器的设计.《浙江工贸职业技术学院学报》.2007,第7卷(第3期),38-42. * |
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