CN104218815A - Current source type three-level AC/AC converter - Google Patents
Current source type three-level AC/AC converter Download PDFInfo
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- CN104218815A CN104218815A CN201410477555.5A CN201410477555A CN104218815A CN 104218815 A CN104218815 A CN 104218815A CN 201410477555 A CN201410477555 A CN 201410477555A CN 104218815 A CN104218815 A CN 104218815A
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Abstract
The invention discloses a current source type three-level AC/AC converter. The current source type three-level AC/AC converter is formed by an input alternating current power supply, a voltage-dividing capacitor, a high-frequency isolation type three-level conversion unit, a frequency converter, an output filter and an output alternating current load which are connected in sequence. According to the converter, on the basis of a traditional AC/AC converter, the two ends of the input alternating current power supply are in parallel connection with two capacitance partial voltages, the front end of the converter can generate three levels including U, U/2 and -Uo/n (n=N2/N1= ), voltage stress of a switch tube is reduced, and output voltage waveform quality is improved. The current source type three-level AC/AC converter has the advantages that voltage stress of a switch device is small, front end voltage spectral characteristics of the output filter are good, the size of the output filter is small, and an alternating current load and alternating current power supply high-frequency electrical isolation can be achieved; and the current source type three-level AC/AC converter can be applied to the application occasions with high voltage and high power and is wide in application prospect.
Description
Technical field
The invention belongs to Technics of Power Electronic Conversion technical field, particularly a kind of current source type three level AC/AC converter.
Background technology
Hand over-hand over (AC-AC) converter technique to be applied power semiconductor device, AC energy is turned a kind of Semiconductor Converting Technology changing the AC energy of required constant voltage constant frequency through variable voltage variable frequency into, also frequency converter is, it is different from common frequency converter, AC rectification is not had to become the link of interchange to direct current another mistake, it is the structure of ac-ac conversion, this technology application widely, comprise AC voltage regulator, AC voltage regulator etc., wherein AC voltage regulator, UPS, has become the terminal equipment of ac power supply system indispensability.Up to now, domestic and international power electronics researcher, for the research of A-A transducer, concentrates on friendship-straight-AC-AC converter and two level friendship-AC-AC converter mostly; Research for many level AC/AC converter is considerably less, and is only confined to the research of non-isolated, low frequency etc.
Traditional AC/AC converter technique comprises Industrial Frequency Transformer, the phased frequency converter of controllable silicon etc.Industrial Frequency Transformer is widely used in industrial and mining enterprises, the field such as scientific research institutions and laboratory in colleges and universities, achieves rate transmitted power of making laughs, the functions such as AC/AC transformer and electrical isolation.But Industrial Frequency Transformer volume is large and heavy, audio noise is large, without voltage stabilizing function, powers time-harmonic wave pollution electrical network phenomenon seriously, can not meet the demand of electric/electronic device miniaturization to nonlinear load.Therefore.Seek high power density, high conversion efficiency, high frequency electrical isolation, noiselessness, network side current waveform can improve, can voltage stabilizing, the research tool of new A C/AC converter with bidirectional power flow be of great significance, its combination property is by much more superior than traditional Industrial Frequency Transformer.And the phased frequency converter output voltage frequency of controllable silicon is generally no more than 1/3rd of input voltage frequency, therefore the phased frequency converter of controllable silicon is used for the powerful dragging of low speed.
If power frequency sinusoidal voltage rectifying and wave-filtering will be inputted, be then reverse into low-frequency ac through high frequency link, just can form AC/DC/AD converter.The circuit topology of the high frequency link AC/DC/AC converter of obvious this AC-DC-AC scheme is complicated, volume weight is large, conversion efficiency is low, harmonic pollution in electric power net is serious, unidirectional power transmission, high in cost of production shortcoming.
AC-DC-AC type of comparing high frequency link AC/DC/AC converter, ac-ac type two level high-frequency link AC/AC converter circuit topology is succinct, two stage power converts, power density is high and conversion efficiency is high, bidirectional power flow, audio-frequency noise are low, network side current waveform improves, and is suitable for middle low power conversion occasion.But two level frequency-conversion link AC/AC converters cannot meet the requirement of large-power occasions.
For many level AC/AC converter, prior art is only confined to non-isolated, low frequency or intermediate frequency isolated AC-DC-AC type three level AC/AC converter and BUCK type non-isolated ac-ac type three level AC/AC converter.
Summary of the invention
The object of the present invention is to provide a kind of current source type three level AC/AC converter, there is circuit topology succinct, high frequency electrical isolation, output filter leading portion voltage spectrum characteristic is good, conversion efficiency and power density high, output waveform quality is high, and reliability is high, is applicable to high-voltage large-capacity AC/AC and converts and electrical isolation occasion.
The technical solution realizing the object of the invention is:
A kind of current source type three level AC/AC converter, is made up of the input ac power connected successively, derided capacitors, high frequency isolation type three level converter unit, frequency converter, output filter and output AC load; Input ac power unit is connected with derided capacitors one end, the derided capacitors other end is connected with high-frequency isolation transformer one end, the high-frequency isolation transformer other end is connected with frequency converter one end, the frequency converter other end is connected with output filter one end, and the output filter other end is connected with output AC load.
Derided capacitors comprises the first derided capacitors and the second derided capacitors; The positive pole of the first derided capacitors is connected with one end of input ac power unit, and the negative pole of the first derided capacitors is connected with the positive pole of the second derided capacitors, and the negative pole of the second derided capacitors is connected with the other end of input ac power.
Described high frequency isolation type three level converter unit comprises the first two-way power switch pipe, the second two-way power switch pipe, the 3rd two-way power switch pipe, the 4th two-way power switch pipe, the 5th two-way power switch pipe, the 6th two-way power switch pipe, the first described bidirectional switch pipe, second two-way power switch pipe, 3rd bidirectional switch pipe, 4th two-way power switch pipe, 5th two-way power switch pipe and the 6th two-way power switch pipe are all form by two single power switch pipe differential concatenations the switch bearing forward, reverse voltage stress and current stress, have two-way blocking-up function, first two-way power switch pipe comprises the first power switch pipe, second power switch pipe, first diode, second diode, second two-way power switch pipe comprises the 3rd power switch pipe, 4th power switch pipe, 3rd diode, 4th diode, 3rd two-way power switch pipe comprises the 5th power switch pipe, 6th power switch pipe, 5th diode, 6th diode, 4th two-way power switch pipe comprises the 7th power switch pipe, 8th power switch pipe, 7th diode, 8th diode, 5th two-way power switch pipe comprises the 9th power switch pipe, tenth power switch pipe, 9th diode, tenth diode, 6th two-way power switch pipe comprises the 11 power switch pipe, 12 power switch pipe, 11 diode, 12 diode.The drain electrode of the first power switch pipe is connected with the positive pole of the first derided capacitors, the source electrode of the first power switch pipe and being connected of the second power switch pipe source electrode, first diode inverse parallel is at the two ends of the first power tube, namely the negative electrode of the first diode is connected with the drain electrode of the first power tube, and the anode of the first diode is connected with the source electrode of the first power switch pipe; The drain electrode of the second power switch pipe is connected with the drain electrode of the drain electrode of the 3rd power switch pipe and the tenth power switch pipe, second diode inverse parallel is at the two ends of the second power tube, namely the negative electrode of the second diode is connected with the drain electrode of the second power tube, and the anode of the second diode is connected with the source electrode of the second power switch pipe; The source electrode of the 3rd power switch pipe is connected with the source electrode of the 4th power switch pipe, 3rd diode inverse parallel is at the two ends of the 3rd power tube, namely the negative electrode of the 3rd diode is connected with the drain electrode of the 3rd power tube, and the anode of the 3rd diode is connected with the source electrode of the 3rd power switch pipe; The drain electrode of the 4th power switch pipe is connected with the non-same polarity of the first former limit winding of high-frequency isolation transformer, 4th diode inverse parallel is at the two ends of the 4th power tube, namely the negative electrode of the 4th diode is connected with the drain electrode of the 4th power tube, and the anode of the 4th diode is connected with the source electrode of the 4th power switch pipe; The source electrode of the 5th power switch pipe is connected with the source electrode of the 6th power switch pipe, the drain electrode of the 5th power switch pipe is connected with the Same Name of Ends of the first former limit winding of high-frequency isolation transformer, 5th diode inverse parallel is at the two ends of the 5th power tube, namely the negative electrode of the 5th diode is connected with the drain electrode of the 5th power tube, and the anode of the 5th diode is connected with the source electrode of the 5th power switch pipe; The drain electrode of the 6th power switch pipe is connected with the drain electrode of the 7th power switch pipe and the drain electrode of the 11 power switch pipe, 6th diode inverse parallel is at the two ends of the 6th power tube, namely the negative electrode of the 6th diode is connected with the drain electrode of the 6th power tube, and the anode of the 6th diode is connected with the source electrode of the 6th power switch pipe; The source electrode of the 7th power switch pipe is connected with the source electrode of the 8th power switch pipe, 7th diode inverse parallel is at the two ends of the 7th power tube, namely the negative electrode of the 7th diode is connected with the drain electrode of the 7th power tube, and the anode of the 7th diode is connected with the source electrode of the 7th power switch pipe; The drain electrode of the 8th power switch pipe is connected with the negative pole of the second derided capacitors, 8th diode inverse parallel is at the two ends of the 8th power tube, namely the negative electrode of the 8th diode is connected with the drain electrode of the 8th power tube, and the anode of the 8th diode is connected with the source electrode of the 8th power switch pipe; The source electrode of the 9th power switch pipe is connected with the source electrode of the tenth power switch pipe, 9th diode inverse parallel is at the two ends of the 9th power tube, namely the negative electrode of the 9th diode is connected with the drain electrode of the 9th power tube, and the anode of the 9th diode is connected with the source electrode of the 9th power switch pipe; Tenth diode inverse parallel is at the two ends of the tenth power tube, and namely the negative electrode of the tenth diode is connected with the drain electrode of the tenth power tube, and the anode of the tenth diode is connected with the source electrode of the tenth power switch pipe; The source electrode of the 11 switching tube is connected with the source electrode of the 12 power switch pipe, 11 diode inverse parallel is at the two ends of the 11 power tube, namely the negative electrode of the 11 diode is connected with the drain electrode of the 11 power tube, and the anode of the 11 diode is connected with the source electrode of the 11 power switch pipe; 12 diode inverse parallel is at the two ends of the 12 power tube, and namely the negative electrode of the 12 diode is connected with the drain electrode of the 12 power tube, and the anode of the 12 diode is connected with the source electrode of the 12 power switch pipe;
Described high-frequency isolation transformer comprises the first former limit winding, the first vice-side winding; The non-same polarity of high-frequency isolation transformer first former limit winding and the source electrode of the second two-way power switch pipe connect together, and the Same Name of Ends of high-frequency isolation transformer first former limit winding and the drain electrode of the 3rd two-way power switch pipe connect together.
Described full wave type frequency converter comprises the 13 power switch pipe, the 14 power switch pipe, the 13 diode, the 14 diode; One end of 13 power switch pipe is connected with the Same Name of Ends of high-frequency isolation transformer first vice-side winding, and one end of the 14 power switch pipe is connected with the non-same polarity of high-frequency isolation transformer first vice-side winding.
Described output filter comprises output filter capacitor; One end of output filter capacitor is connected with one end of the 13 power switch pipe, and the other end of output filter capacitor is connected with one end of the 14 power switch pipe.
One end of described AC load is connected with one end of output filter capacitor, and the other end of AC load is connected with the other end of output filter capacitor.
The present invention compared with prior art, its remarkable advantage:
(1) the structure thinking of three-level topology is applied in the AC/AC circuit of conventional current source.And high-frequency isolation transformer is added between input and AC load, achieve the electrical isolation of input side and load-side, realize the miniaturization of converter, lightweight simultaneously, improve the efficiency of converter.
(2) compared with traditional two level converters, this converter can obtain U, U/2 ,-Uo/n three level in transformer front end, reduce switch tube voltage stress and output filter volume, improve output voltage waveforms simultaneously, be more suitable for high-tension high-power occasion.
(3) circuit topology of the present invention is succinct, decrease power conversion progression, bidirectional power flow, at an output AC high frequency intra-cycle isolating transformer magnetic core by two-way magnetization, the utilance of magnetic core of transformer is high, the advantages such as output filter front voltage spectral characteristic is good, thus improve conversion efficiency and power density, reduction volume and weight.
Accompanying drawing explanation
Fig. 1 is the current source type three level AC/AC converter circuit structural representation of one embodiment of the invention.
Embodiment
The current source type three level AC/AC converter circuit structural representation of the one embodiment of the invention shown in composition graphs 1, wherein, a kind of current source type three level AC/AC converter, is made up of the input ac power unit 1 connected successively, derided capacitors 2, high frequency isolation type three level converter unit 3, high-frequency isolation transformer 4, frequency converter 5, output filter 6 and output AC load 7; Wherein:
Input ac power unit 1 is connected with derided capacitors 2 one end, derided capacitors 2 other end is connected with high frequency isolation type three level converter unit 3 one end, high frequency isolation type three level converter unit 3 other end is connected with high-frequency isolation transformer 4 one end, high-frequency isolation transformer 4 other end is connected with frequency converter 5 one end, frequency converter 5 other end is connected with output filter 6 one end, and output filter 6 other end is connected with output AC load 7.
As shown in Figure 1, described input ac power unit 1 comprises output AC power source U.
Described derided capacitors 2 comprises the first derided capacitors C1 and the second derided capacitors C2.
Described high frequency isolation type three level converter unit 3 comprises the first two-way power switch pipe S1, the second two-way power switch pipe S2, the 3rd two-way power switch pipe S3, the 4th two-way power switch pipe S4, the 5th two-way power switch pipe S5, the 6th two-way power switch pipe S6; Described two-way power switch pipe is all form by two single power switch pipe differential concatenations the switch bearing forward, reverse voltage stress and current stress, has two-way blocking-up function.
First two-way power switch pipe S1 comprises the first power switch tube S 1a, the second power switch tube S 1b, the first diode D1a, diode D1b; Second two-way power switch pipe S2 comprises the 3rd power switch tube S 2a, the 4th power switch tube S 2b, the 3rd diode D2a, tetrode D2b; 3rd two-way power switch pipe S3 comprises the 5th power switch tube S 3a, the 6th power switch tube S 3b, the 5th diode D3a, hexode D3b; 4th two-way power switch pipe S4 comprises the 7th power switch tube S 4a, the 8th power switch tube S 4b, the 7th diode D4a, the 8th diode D4b; 5th two-way power switch pipe S5 comprises the 9th power switch tube S 5a, the tenth power switch tube S 5b, the 9th diode D5a, the tenth diode D5b; 6th two-way power switch pipe S6 comprises the 11 power switch tube S 6a, the 12 power switch tube S 6b, the 11 diode D6a, the 12 diode D6b.
Described high-frequency isolation transformer 4 comprises the first former limit winding L 1, first vice-side winding L2.
Described full wave type frequency converter 5 comprises the 13 switching tube S7a, the 14 power switch tube S 7b, the 13 diode D7a, the 14 diode D7b.
Described output filter 6 comprises output filter capacitor C
f.
Described output AC load 7 comprises AC load R
l.
Shown in composition graphs 1, aforementioned each input ac power unit 1, derided capacitors 2, high frequency isolation type three level converter unit 3, high-frequency isolation transformer 4, frequency converter 5, concrete connection between output filter 6 and output AC load 7 are as follows:
The positive pole of the first derided capacitors C1 is connected with one end of input ac power U, the negative pole of the first derided capacitors C1 is connected with the positive pole of the second derided capacitors C2, the drain electrode of the 9th power switch tube S 5a and the drain electrode of the 11 power switch tube S 6a, and the negative pole of the second derided capacitors C2 is connected with the other end of input ac power U;
The drain electrode of the first power switch tube S 1a is connected with the positive pole of the first derided capacitors C1, the source electrode of the first power switch tube S 1a and being connected of the second power switch tube S 1b source electrode, first diode D1a inverse parallel is at the two ends of the first power tube S1a, namely the negative electrode of the first diode D1a is connected with the drain electrode of the first power tube S1a, and the anode of the first diode D1a is connected with the source electrode of the first power switch tube S 1a;
The drain electrode of the second power switch tube S 1b is connected with the drain electrode of the drain electrode of the 3rd power switch tube S 2a and the tenth power switch tube S 5b.Second diode D1b inverse parallel is at the two ends of the second power tube S1b, and namely the negative electrode of the second diode D1a is connected with the drain electrode of the second power tube S1b, and the anode of the second diode D1b is connected with the source electrode of the second power switch tube S 1b;
The source electrode of the 3rd power switch tube S 2a is connected with the source electrode of the 4th power switch tube S 2b.3rd diode D2a inverse parallel is at the two ends of the 3rd power tube S2a, and namely the negative electrode of the 3rd diode D2a is connected with the drain electrode of the 3rd power tube S2a, and the anode of the 3rd diode D2a is connected with the source electrode of the 3rd power switch tube S 2a;
The drain electrode of the 4th power switch tube S 2b is connected with the non-same polarity of the first former limit winding L 1 of high-frequency isolation transformer.4th diode D2b inverse parallel is at the two ends of the 4th power tube S2b, and namely the negative electrode of the 4th diode D2b is connected with the drain electrode of the 4th power tube S2b, and the anode of the 4th diode D2b is connected with the source electrode of the 4th power switch tube S 2b;
The source electrode of the 5th power switch tube S 3a is connected with the source electrode of the 6th power S3b switching tube, and the drain electrode of the 5th power switch tube S 3a is connected with the Same Name of Ends of the first former limit winding L 1 of high-frequency isolation transformer.5th diode D3a inverse parallel is at the two ends of the 5th power tube S3a, and namely the negative electrode of the 5th diode D3a is connected with the drain electrode of the 5th power tube S3a, and the anode of the 5th diode D3a is connected with the source electrode of the 5th power switch tube S 3a;
The drain electrode of the 6th power switch tube S 3b is connected with the drain electrode of the 7th power S4a switching tube and the drain electrode of the 11 power switch tube S 6a.6th diode D3b inverse parallel is at the two ends of the 6th power tube S3b, and namely the negative electrode of the 6th diode D3b is connected with the drain electrode of the 6th power tube S3b, and the anode of the 6th diode D3b is connected with the source electrode of the 6th power switch tube S 3b;
The source electrode of the 7th power switch tube S 4a is connected with the source electrode of the 8th power switch tube S 4b.7th diode D4a inverse parallel is at the two ends of the 7th power tube S4a, and namely the negative electrode of the 7th diode D4a is connected with the drain electrode of the 7th power tube S4a, and the anode of the 7th diode D4a is connected with the source electrode of the 7th power switch tube S 4a;
The drain electrode of the 8th power switch tube S 4b is connected with the negative pole of the second derided capacitors C2.8th diode D4b inverse parallel is at the two ends of the 8th power tube S4b, and namely the negative electrode of the 8th diode D4b is connected with the drain electrode of the 8th power tube S4b, and the anode of the 8th diode D4b is connected with the source electrode of the 8th power switch tube S 4b;
The source electrode of the 9th power switch tube S 5a is connected with the source electrode of the tenth power switch tube S 5b.9th diode D5a inverse parallel is at the two ends of the 9th power tube S5a, and namely the negative electrode of the 9th diode D5a is connected with the drain electrode of the 9th power tube S5a, and the anode of the 9th diode D5a is connected with the source electrode of the 9th power switch tube S 5a; Tenth diode D5b inverse parallel is at the two ends of the tenth power tube S5b, and namely the negative electrode of the tenth diode D5b is connected with the drain electrode of the tenth power tube S5b, and the anode of the tenth diode D5b is connected with the source electrode of the tenth power switch tube S 5b;
The source electrode of the 11 switching tube S6a is connected with the source electrode of the 12 power switch tube S 6b.11 diode D6a inverse parallel is at the two ends of the 11 power tube S6a, and namely the negative electrode of the 11 diode D6a is connected with the drain electrode of the 11 power tube S6a, and the anode of the 11 diode D6a is connected with the source electrode of the 11 power switch tube S 6a; 12 diode D6b inverse parallel is at the two ends of the 12 power tube S6b, and namely the negative electrode of the 12 diode D6b is connected with the drain electrode of the 12 power tube S6b, and the anode of the 12 diode D6b is connected with the source electrode of the 12 power switch tube S 6b;
The non-same polarity of the first former limit winding L 1 and the source electrode of the 4th power switch tube S 2b of high-frequency isolation transformer 4 connect together, the Same Name of Ends of high-frequency isolation transformer first former limit winding L 1 and the drain electrode of the 5th power switch tube S 3a connect together, the Same Name of Ends of high-frequency isolation transformer first vice-side winding L2 is connected with the drain electrode of the 13 power switch tube S 7a, the non-same polarity of high-frequency isolation transformer first vice-side winding L2 and the drain electrode of the 14 power switch tube S 7b be connected;
The source electrode of the 13 power switch tube S 7a and filter capacitor C
fone end and AC load R
lconnect, the 13 diode D7a inverse parallel is at the two ends of the 13 power tube S7a, and namely the negative electrode of the 13 diode D7a is connected with the drain electrode of the 13 power tube S7a, and the anode of the 13 diode D7a is connected with the source electrode of the 13 power switch tube S 7a;
The source electrode of the 14 power switch tube S 7b and filter capacitor C
fthe other end and AC load R
lthe other end is connected, 14 diode D7b inverse parallel is at the two ends of the 14 power tube S1a, namely the negative electrode of the 14 diode D1a is connected with the drain electrode of the 14 power tube S1a, and the anode of the 14 diode D1a is connected with the source electrode of the 14 power switch tube S 1a;
Output filter capacitor C
fone end and the source electrode of the 13 power switch tube S 7a and AC load R
lone end is connected, output filter capacitor C
fthe other end and the source electrode of the 14 power switch tube S 7b and AC load R
lthe other end is connected;
AC load R
lone end and output filter capacitor C
fone end connect, the other end of AC load and output filter capacitor C
fthe other end connect.
This AC/AC converter can adopt the control mode of pulse modulation (SPWM) copped wave of active-clamp.
When input ac power U is to AC load R
lduring transmitted power, AC-input voltage can obtain two kinds of level (U after derided capacitors dividing potential drop, U/2), input voltage after dividing potential drop is modulated into bipolarity through high frequency isolation type three level converter unit, many level (U, + U/2,-Uo/n) high-frequency pulse voltage, through the isolation of high-frequency isolation transformer, after transmission, frequency converter is demodulated into unipolarity, many level (+Uo, 0,-Uo) low-frequency pulse voltage carry out obtaining after output filtering stable or adjustable sinusoidal voltage Uo through output filter again, this AC/AC converter has four-quadrant operation ability, therefore perception can be with, capacitive, resistive and rectified load, the control circuit of this AC/AC converter can adjust according to the character of AC load, thus obtain stable or adjustable voltage at output.
Below in conjunction with accompanying drawing, the present invention is described in further detail:
By reference to the accompanying drawings 1, current source type three level AC/AC converter of the present invention, input ac power unit 1 wherein, derided capacitors 2, high frequency isolation type three level converter unit 3, high-frequency isolation transformer 4, frequency converter 5, output filter 6 are connected successively with output AC load 7, input AC net side electricity is transformed into stable or adjustable sine electricity by this converter, and reduce power conversion progression, realize high frequency electrical isolation, be applicable to high-power friendship-alternation carry over and close, be i.e. the first derided capacitors C
1, the second derided capacitors C
2series connection is attempted by input DC power U two ends, at the first derided capacitors C
1positive pole can obtain voltage+U, at the second derided capacitors C
2positive pole can obtain voltage+U/2,
Output input voltage after derided capacitors dividing potential drop being converted into the high frequency isolation type three level converter unit of many level output voltage is connected with one end of frequency converter; Described frequency converter is made up of the 13 power switch S7a and the 14 power switch S7b, will through high frequency isolation type three level converter unit, high-frequency isolation transformer, be converted into output voltage; One end of tenth three-dimensional power switch S7a of described frequency converter is connected with the Same Name of Ends of the vice-side winding L2 of high-frequency isolation transformer, the other end of the 13 power switch S7a of frequency converter and output filter capacitor C
fone end and output AC load R
lone end connect, one end of the 14 power switch S7b of frequency converter is connected with the non-same polarity of the vice-side winding L2 of high-frequency isolation transformer, the 14 power switch S of frequency converter
7bthe other end and output filter capacitor C
fthe other end and output AC load R
lthe other end connect, described output filter capacitor C
fform output filter, the high order harmonic component in the output voltage of this frequency converter described in output filter filtering, thus obtain high-quality sinusoidal voltage U in output AC load-side
o.
Claims (3)
1. a current source type three level AC/AC converter, is characterized in that: be made up of the input ac power unit (1) connected successively, derided capacitors (2), high frequency isolation type three level converter unit (3), high-frequency isolation transformer (4), frequency converter (5), output filter (6) and output AC load (7); Wherein:
Input ac power unit (1) is connected with derided capacitors (2) one end, derided capacitors (2) other end is connected with high frequency isolation type three level converter unit (3) one end, high frequency isolation type three level converter unit (3) other end is connected with high-frequency isolation transformer (4) one end, high-frequency isolation transformer (4) other end is connected with frequency converter (5) one end, frequency converter (5) other end is connected with output filter (6) one end, and output filter (6) other end is connected with output AC load (7).
2. current source type three level AC/AC converter according to claim 1, is characterized in that:
Described input ac power unit (1) comprises output AC power source (U);
Described derided capacitors (2) comprises the first derided capacitors (C1) and the second derided capacitors (C2);
Described high frequency isolation type three level converter unit (3) comprises the first two-way power switch pipe (S1), the second two-way power switch pipe (S2), the 3rd two-way power switch pipe (S3), the 4th two-way power switch pipe (S4), the 5th two-way power switch pipe (S5), the 6th two-way power switch pipe (S6); Described two-way power switch pipe is all form by two single power switch pipe differential concatenations the switch bearing forward, reverse voltage stress and current stress, has two-way blocking-up function;
First two-way power switch pipe (S1) comprises the first power switch pipe (S1a), the second power switch pipe (S1b), the first diode (D1a), diode (D1b); Second two-way power switch pipe (S2) comprises the 3rd power switch pipe (S2a), the 4th power switch pipe (S2b), the 3rd diode (D2a), tetrode (D2b); 3rd two-way power switch pipe (S3) comprises the 5th power switch pipe (S3a), the 6th power switch pipe (S3b), the 5th diode (D3a), hexode (D3b); 4th two-way power switch pipe (S4) comprises the 7th power switch pipe (S4a), the 8th power switch pipe (S4b), the 7th diode (D4a), the 8th diode (D4b); 5th two-way power switch pipe (S5) comprises the 9th power switch pipe (S5a), the tenth power switch pipe (S5b), the 9th diode (D5a), the tenth diode (D5b); 6th two-way power switch pipe (S6) comprises the 11 power switch pipe (S6a), the 12 power switch pipe (S6b), the 11 diode (D6a), the 12 diode (D6b);
Described high-frequency isolation transformer (4) comprises the first former limit winding (L1), the first vice-side winding (L2);
Described full wave type frequency converter (5) comprises the 13 switching tube (S7a), the 14 power switch pipe (S7b), the 13 diode (D7a), the 14 diode (D7b);
Described output filter (6) comprises output filter capacitor (C
f);
Described output AC load (7) comprises AC load (R
l).
3. current source type three level AC/AC converter according to claim 2, is characterized in that:
The positive pole of the first derided capacitors (C1) is connected with one end of input ac power (U), the negative pole of the first derided capacitors (C1) is connected with the positive pole of the second derided capacitors (C2), the drain electrode of the 9th power switch pipe (S5a) and the drain electrode of the 11 power switch pipe (S6a), and the negative pole of the second derided capacitors (C2) is connected with the other end of input ac power (U);
The drain electrode of the first power switch pipe (S1a) is connected with the positive pole of the first derided capacitors (C1), the source electrode of the first power switch pipe (S1a) and being connected of the second power switch pipe (S1b) source electrode, first diode (D1a) inverse parallel is at the two ends of the first power tube (S1a), namely the negative electrode of the first diode (D1a) is connected with the drain electrode of the first power tube (S1a), and the anode of the first diode (D1a) is connected with the source electrode of the first power switch pipe (S1a);
The drain electrode of the second power switch pipe (S1b) is connected with the drain electrode of the drain electrode of the 3rd power switch pipe (S2a) and the tenth power switch pipe (S5b).Second diode (D1b) inverse parallel is at the two ends of the second power tube (S1b), namely the negative electrode of the second diode (D1a) is connected with the drain electrode of the second power tube (S1b), and the anode of the second diode (D1b) is connected with the source electrode of the second power switch pipe (S1b);
The source electrode of the 3rd power switch pipe (S2a) is connected with the source electrode of the 4th power switch pipe (S2b).3rd diode (D2a) inverse parallel is at the two ends of the 3rd power tube (S2a), namely the negative electrode of the 3rd diode (D2a) is connected with the drain electrode of the 3rd power tube (S2a), and the anode of the 3rd diode (D2a) is connected with the source electrode of the 3rd power switch pipe (S2a);
The drain electrode of the 4th power switch pipe (S2b) is connected with the non-same polarity on the first former limit winding (L1) of high-frequency isolation transformer.4th diode (D2b) inverse parallel is at the two ends of the 4th power tube (S2b), namely the negative electrode of the 4th diode (D2b) is connected with the drain electrode of the 4th power tube (S2b), and the anode of the 4th diode (D2b) is connected with the source electrode of the 4th power switch pipe (S2b);
The source electrode of the 5th power switch pipe (S3a) is connected with the source electrode of the 6th power (S3b) switching tube, and the drain electrode of the 5th power switch pipe (S3a) is connected with the Same Name of Ends on the first former limit winding (L1) of high-frequency isolation transformer.5th diode (D3a) inverse parallel is at the two ends of the 5th power tube (S3a), namely the negative electrode of the 5th diode (D3a) is connected with the drain electrode of the 5th power tube (S3a), and the anode of the 5th diode (D3a) is connected with the source electrode of the 5th power switch pipe (S3a);
The drain electrode of the 6th power switch pipe (S3b) is connected with the drain electrode of the 7th power (S4a) switching tube and the drain electrode of the 11 power switch pipe (S6a).6th diode (D3b) inverse parallel is at the two ends of the 6th power tube (S3b), namely the negative electrode of the 6th diode (D3b) is connected with the drain electrode of the 6th power tube (S3b), and the anode of the 6th diode (D3b) is connected with the source electrode of the 6th power switch pipe (S3b);
The source electrode of the 7th power switch pipe (S4a) is connected with the source electrode of the 8th power switch pipe (S4b).7th diode (D4a) inverse parallel is at the two ends of the 7th power tube (S4a), namely the negative electrode of the 7th diode (D4a) is connected with the drain electrode of the 7th power tube (S4a), and the anode of the 7th diode (D4a) is connected with the source electrode of the 7th power switch pipe (S4a);
The drain electrode of the 8th power switch pipe (S4b) is connected with the negative pole of the second derided capacitors (C2).8th diode (D4b) inverse parallel is at the two ends of the 8th power tube (S4b), namely the negative electrode of the 8th diode (D4b) is connected with the drain electrode of the 8th power tube (S4b), and the anode of the 8th diode (D4b) is connected with the source electrode of the 8th power switch pipe (S4b);
The source electrode of the 9th power switch pipe (S5a) is connected with the source electrode of the tenth power switch pipe (S5b).9th diode (D5a) inverse parallel is at the two ends of the 9th power tube (S5a), namely the negative electrode of the 9th diode (D5a) is connected with the drain electrode of the 9th power tube (S5a), and the anode of the 9th diode (D5a) is connected with the source electrode of the 9th power switch pipe (S5a); Tenth diode (D5b) inverse parallel is at the two ends of the tenth power tube (S5b), namely the negative electrode of the tenth diode (D5b) is connected with the drain electrode of the tenth power tube (S5b), and the anode of the tenth diode (D5b) is connected with the source electrode of the tenth power switch pipe (S5b);
The source electrode of the 11 switching tube (S6a) is connected with the source electrode of the 12 power switch pipe (S6b).11 diode (D6a) inverse parallel is at the two ends of the 11 power tube (S6a), namely the negative electrode of the 11 diode (D6a) is connected with the drain electrode of the 11 power tube (S6a), and the anode of the 11 diode (D6a) is connected with the source electrode of the 11 power switch pipe (S6a); 12 diode (D6b) inverse parallel is at the two ends of the 12 power tube (S6b), namely the negative electrode of the 12 diode (D6b) is connected with the drain electrode of the 12 power tube (S6b), and the anode of the 12 diode (D6b) is connected with the source electrode of the 12 power switch pipe (S6b);
The non-same polarity on the first former limit winding (L1) of high-frequency isolation transformer (4) and the source electrode of the 4th power switch pipe (S2b) connect together, the Same Name of Ends on high-frequency isolation transformer first former limit winding (L1) and the drain electrode of the 5th power switch pipe (S3a) connect together, the Same Name of Ends of high-frequency isolation transformer first vice-side winding (L2) is connected with the drain electrode of the 13 power switch pipe (S7a), the non-same polarity of high-frequency isolation transformer first vice-side winding (L2) and the drain electrode of the 14 power switch pipe (S7b) be connected;
The source electrode of the 13 power switch pipe (S7a) and filter capacitor (C
f) one end and AC load (R
l) connect, 13 diode (D7a) inverse parallel is at the two ends of the 13 power tube (S7a), namely the negative electrode of the 13 diode (D7a) is connected with the drain electrode of the 13 power tube (S7a), and the anode of the 13 diode (D7a) is connected with the source electrode of the 13 power switch pipe (S7a);
The source electrode of the 14 power switch pipe (S7b) and filter capacitor (C
f) the other end and AC load (R
l) other end is connected, 14 diode (D7b) inverse parallel is at the two ends of the 14 power tube (S1a), namely the negative electrode of the 14 diode (D1a) is connected with the drain electrode of the 14 power tube (S1a), and the anode of the 14 diode (D1a) is connected with the source electrode of the 14 power switch pipe (S1a);
Output filter capacitor (C
f) one end and the source electrode of the 13 power switch pipe (S7a) and AC load (R
l) one end is connected, output filter capacitor (C
f) the other end and the source electrode of the 14 power switch pipe (S7b) and AC load (R
l) other end is connected;
AC load (R
l) one end and output filter capacitor (C
f) one end connect, the other end of AC load and output filter capacitor (C
f) the other end connect.
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| CN201410477555.5A CN104218815A (en) | 2014-09-18 | 2014-09-18 | Current source type three-level AC/AC converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410477555.5A CN104218815A (en) | 2014-09-18 | 2014-09-18 | Current source type three-level AC/AC converter |
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Cited By (1)
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|---|---|---|---|---|
| CN106899203A (en) * | 2017-03-24 | 2017-06-27 | 南京理工大学 | Positive activation type five-electrical level inverter |
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Application publication date: 20141217 |