CN202121509U - High voltage isolation distributed drive power source - Google Patents
High voltage isolation distributed drive power source Download PDFInfo
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- CN202121509U CN202121509U CN2011201773583U CN201120177358U CN202121509U CN 202121509 U CN202121509 U CN 202121509U CN 2011201773583 U CN2011201773583 U CN 2011201773583U CN 201120177358 U CN201120177358 U CN 201120177358U CN 202121509 U CN202121509 U CN 202121509U
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Abstract
The utility model discloses a high voltage isolation distributed drive power source. The drive power source includes a triangular wave current source generating circuit, a current bus, at least one isolation current transformer, and an output power source unit connecting with a secondary side of the corresponding isolation current transformer. The triangular wave current source includes a detection circuit used to converting current to a voltage signal, a triangular wave current control circuit connecting with an output end of the detection circuit, a drive circuit connecting with an output end of the triangular wave current control circuit, a bridge transfer circuit connecting with an output end of the drive circuit, and a rectifying filtering circuit arranged in an input end of the bridge transfer circuit. The current bus runs through the isolation current transformer and forms a closed loop circuit with the detection circuit and the bridge transfer circuit. The high voltage isolation distributed drive power source in the utility model has advantages of high isolation degree, low distributed capacity, low electromagnetic interference, easy control, high reliability, low cost, small volume, good flexibility in the output power configuration and the like.
Description
Technical field
The utility model relates to a kind of driving power, is specifically related to a kind of high pressure and isolates distributed driving power, belongs to intelligent grid, new forms of energy and energy-saving and cost-reducing technical field.
Background technology
Propelling along with intelligent grid construction, new forms of energy development and the policy of saving energy and reduce the cost; A large amount of electrification electronic technology in various power conversion technologies such as flexible AC transmission technology, alternating frequency conversion technique, the power quality control technology (containing all kinds of dynamic passive compensation technology), and all develop to the high-tension high-power direction.
In the high-tension high-power power electronic equipment, owing to receive the withstand voltage restriction of components and parts, components and parts uses of must connecting, the component number of connecting in some big power conversion units is extremely many.Between the power supply of the drive circuit of the components and parts that series connection is used, also bear high voltage between the power supply of drive circuit and major loop.
The power supply of drive circuit is mainly voltage source parallel operation mode at present; This mode realizes the primary and secondary and secondary isolation of respectively organizing power supply with isolating transformer; When the high-tension high-power power electronic equipment needed up to a hundred groups of driving powers, practice was just very difficult on the engineering.That this mode implements is bulky, cost is high, and bigger shortcoming is that to isolate distributed capacitance big, has limited the high frequencyization of major loop.
For addressing the above problem, current source type distributed power source scheme has been proposed, at present this scheme there are some researchs, the current source mode mainly contains sinusoidal wave two kinds of ac square wave resonant formula in the existing research.
AC square wave current source mode is the direct current that AC power is obtained permanent amplitude after rectification and BUCK conversion, obtains AC square wave current through the bridge-type conversion again.AC square wave current contains bigger harmonic wave, and the harmonic wave amount is about 48%, and the high order harmonic component amount is big, and electromagnetic interference is serious.This scheme volume is big, and reliability is low.
Resonant mode sine-wave current source mode is on the basis in AC square wave current source; Add the resonance link in output stage; Make output current be similar to sine wave, this technology is having greatly improved aspect harmonic wave, electromagnetic interference and the devices switch characteristic, but control is complicated, reliability is low.
The utility model content
To the deficiency that prior art exists, the utility model purpose provides a kind of high-isolation, isolates little, the low electromagnetic interference of distributed capacitance, is easy to control, high reliability, cost is low, volume is little and the out-put supply block configuration flexibly high pressure isolate distributed driving power.
To achieve these goals, the utility model is to realize through following technical scheme:
The utility model comprises and exchanges triangular current source generating circuit, current bus bar, is provided with an isolation current transformer and the out-put supply module that is connected with corresponding isolation Current Transformer Secondary side at least; Exchange the triangular current source generating circuit and comprise that being used for current conversion is the testing circuit of voltage signal, the triangular current control circuit that is connected with the testing circuit output, the drive circuit that is connected with triangular current control circuit output, the bridge conversion circuit that is connected with the drive circuit output and the current rectifying and wave filtering circuit that is arranged on the bridge conversion circuit input; Current bus bar runs through isolates current transformer and forms the closed-loop path with testing circuit and bridge conversion circuit.
Above-mentioned bridge conversion circuit comprises first igbt, second igbt, the 3rd igbt, the 4th igbt and inductance; The first igbt source electrode connects the drain electrode of second igbt, its public termination inductance one end, another termination current bus bar one end of inductance; The 3rd igbt source electrode connects the drain electrode of the 4th igbt, its public termination current bus bar other end; The drain electrode of first igbt is connected its public termination current rectifying and wave filtering circuit one output with the drain electrode of the 3rd igbt; The second igbt source electrode is connected with the 4th igbt source electrode, its public another output of termination current rectifying and wave filtering circuit.
Above-mentioned drive circuit comprises first driver module and second driver module; First driver module connects driving first igbt and second igbt; Second driver module connects driving the 3rd igbt and the 4th igbt.
Above-mentioned triangular current control circuit comprises first comparator, second comparator, first resistance, second resistance, the 3rd resistance and the 4th resistance; First resistance and the series connection of the 3rd resistance, its public termination first comparator first input end, another termination testing circuit output of first resistance, the 3rd resistance other end ground connection; Second resistance and the series connection of the 4th resistance, its public termination first comparator second input, the second resistance other end ground connection, another termination first comparator output terminal of the 4th resistance; First comparator output terminal connects the first driver module input and the second comparator first input end; Second comparator, the second input termination ground connection; Second comparator output terminal connects the second driver module input.The utility model utilized dexterously inductance intrinsic voltage-current characteristic form triangular current output, make control circuit simple, reliable.
What above-mentioned testing circuit adopted is current sensor.
What above-mentioned current bus bar adopted is single-core high-voltage cable.
The utlity model has the isolation height, isolate that distributed capacitance is little, cost is low and advantage such as volume is little; The current source waveform of the utility model is a triangular wave, and the harmonic wave amount is lower than 12%, and is slightly higher than existing resonant mode sine-wave current source harmonic wave amount, but wherein the triple-frequency harmonics amount about more than 11%, seven time high order harmonic component almost do not have, so electromagnetic interference is very little; The utility model has also that loss is little, efficient is high, control is simple and the reliability advantages of higher; The utility model current bus bar passes the isolation current transformer; Isolate current transformer and can be installed in the optional position that current bus bar is passed by, (power electronic equipment comprises a plurality of power electronic device to the quantity of isolation current transformer and out-put supply module according to power electronic equipment.) required insulating power supply quantity configuration, make that the out-put supply block configuration is flexible.
Description of drawings
Specify the utility model below in conjunction with accompanying drawing and embodiment;
Fig. 1 is the structured flowchart of the utility model;
Fig. 2 is the main loop circuit figure of the utility model;
Fig. 3 is the triangular current control circuit of the utility model, the circuit diagram of drive circuit;
Fig. 4 is the bridge conversion circuit drive waveforms figure (first igbt and the 4th igbt) of the utility model;
Fig. 5 is the bridge conversion circuit drive waveforms figure (second igbt and the 3rd igbt) of the utility model;
Fig. 6 is the current waveform figure of the interchange triangular current source generating circuit output of the utility model.
Embodiment
For technological means, character of innovation that the utility model is realized, reach purpose and be easy to understand understanding with effect, below in conjunction with embodiment, further set forth the utility model.
Referring to Fig. 1, the utility model comprises and exchanges triangular current source generating circuit, current bus bar, is provided with one (its quantity is identical with the required insulating power supply quantity of power electronic equipment) isolation current transformer and the out-put supply module that is connected with corresponding isolation Current Transformer Secondary side at least.Magnetic coupling between current bus bar and isolation current transformer.
Power electronic device is electrically connected with corresponding out-put supply module, interconnects between power electronic device, the utility model is as the driving power of power electronic device.
Exchange the triangular current source generating circuit comprise AC220V power supply, accessory power supply (± 12V), to be used for current conversion be the testing circuit LT1 of voltage signal, the triangular current control circuit that is connected with testing circuit LT1 output, the drive circuit that is connected with triangular current control circuit output, the bridge conversion circuit that is connected with the drive circuit output and the current rectifying and wave filtering circuit that is arranged on the bridge conversion circuit input.The AC220V power supply is connected with current rectifying and wave filtering circuit and accessory power supply; Drive circuit, triangular current control circuit and testing circuit LT1 all supply power through accessory power supply.
Current bus bar runs through isolates current transformer and forms the closed-loop path with testing circuit LT1 and bridge conversion circuit.
The utility model is through exchanging the interchange triangular current source that the triangular current source generating circuit is transformed to AC220V power supply (other electric pressures also can) high frequency (more than the 20KHz); The isolation current transformer is passed through current bus bar in this interchange triangular current source; Isolate the Current Transformer Secondary side and current source is converted into the voltage source of voltage stabilizing, can obtain high-isolation, isolate little, the low electromagnetic interference of distributed capacitance, high reliability, cost is low and volume is little driving power through the out-put supply module.
Referring to Fig. 2, current rectifying and wave filtering circuit comprises the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4 and the first capacitor C1.The full-bridge rectification that the AC220V power supply is formed through the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4, the direct voltage V+ that capacitor C1 filtering obtains about 300V.
Bridge conversion circuit comprises the first igbt Q1A, the second igbt Q1B, the 3rd igbt Q1C, the 4th igbt Q1D and inductance L; The first igbt Q1A source electrode E connects second igbt Q1B drain electrode C, its public termination inductance L one end, another termination current bus bar one end of inductance L; The 3rd igbt Q1C source electrode E connects the 4th igbt Q1D drain electrode C, its public termination current bus bar other end; First igbt Q1A drain electrode C is connected its public termination current rectifying and wave filtering circuit positive output end V+ with the 3rd igbt Q1C drain electrode C; The second igbt Q1B source electrode E is connected with the 4th igbt Q1D source electrode E, its public termination current rectifying and wave filtering circuit negative output terminal V-.
Referring to Fig. 3, drive circuit comprises the first driver module U2, the second driver module U3, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9 and the tenth resistance R 10.
The HOB of the first driver module U2 connects the first igbt Q1A grid G; HOE connects the first igbt Q1A source electrode E; LOB connects the second igbt Q1B grid G, and LOE connects the second igbt Q1B source electrode E.Between the HOB and the first igbt Q1A grid G, also be connected with the 7th resistance R 7; Between the LOB and the second igbt Q1B grid G, also be connected with the 8th resistance R 8.
The HOB of the second driver module U3 connects the 3rd igbt Q1C grid G; HOE connects the 3rd igbt Q1C source electrode E; LOB connects the 4th igbt Q1D grid G, and LOE connects the 4th igbt Q1D source electrode E.Between HOB and the 3rd igbt Q1C grid G, also be connected with the 9th resistance R 9; Between LOB and the 4th igbt Q1D grid G, also be connected with the tenth resistance R 10.
Wherein, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9 and the tenth resistance R 10 are used to place restrictions on electric current.
The triangular current control circuit comprises the first comparator U1A, the second comparator U1B, the 5th diode D5, the 6th diode D6, first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5 and the 6th resistance R 6.
First resistance R 1 and 3 series connection of the 3rd resistance R, its public termination first comparator U1A negative input end (the 2nd pin), first resistance R, 1 another termination testing circuit LT1 output Vi, the 3rd resistance R 3 other end ground connection; Second resistance R 2 and 4 series connection of the 4th resistance R, its public termination first comparator U1A positive input terminal (the 3rd pin), second resistance R, 2 other end ground connection, the 4th resistance R 4 another termination first comparator U1A outputs (the 1st pin); The 5th resistance R 5 one terminations first comparator U1A output (the 1st pin), its another termination the 5th diode D5 negative electrode and the first driver module U2 input IN.The second comparator U1B negative input end (the 6th pin) connects the first comparator U1A output (the 1st pin); Second comparator U1B positive input terminal (the 5th pin) ground connection; The 6th resistance R 6 one terminations second comparator U1B output (the 7th pin), its another termination the 6th diode D6 negative electrode and the second driver module U3 input IN.
Wherein, the 5th diode D5 and the 6th diode D6 are used to limit reverse voltage; The 5th resistance R 5 and the 6th resistance R 6 are used to place restrictions on electric current.
In the present embodiment, what testing circuit LT1 adopted is current sensor.
The work engineering of the utility model is following:
Initial condition is set first comparator U1A output output high level "+", the second comparator U1B output output low level "-"; At this moment, the HOB of first driver module U2 output high level, LOB output low level, the HOB output low level of the second driver module U3, LOB export high level; The then first igbt Q1A and the 4th igbt Q1D conducting; The 3rd igbt Q1C and the second igbt Q1B end, and output current is by V+ → first igbt Q1A → inductance L → current bus bar → the 4th igbt Q1D → V-.
Because the existence of inductance L in this loop, electric current can not suddenly change, and output current will rise by 0 gradually.Output current converts voltage signal Vi into by current sensor; Increase Vi rising along with output current; Vi divides the negative input end that is crimped to the first comparator U1A via first resistance R 1,3 series connection of the 3rd resistance R; When voltage after partial reaches the first comparator U1A output; Divide when being crimped to the voltage of the first comparator U1A positive input terminal via second resistance R 2,4 series connection of the 4th resistance R, the first comparator U1A output becomes "-" by "+", and the second comparator U1B output becomes "+" by "-"; This moment, HOB output low level, the LOB of the first driver module U2 exported high level; The HOB output high level of the second driver module U3, LOB output low level, then the first igbt Q1A and the 4th igbt Q1D end, the 3rd igbt Q1C and the second igbt Q1B conducting.
This moment, the inductance L voltage was opposite with preceding state; Because of the inductance L electric current can not suddenly change; Output current is reduced by the fly-wheel diode → V+ among the fly-wheel diode → inductance L → current bus bar among V-→ second igbt Q1B → the 3rd igbt Q1C gradually; When output current was decreased to zero, output current was reverse, and output current is by V+ → the 3rd igbt Q1C → current bus bar → inductance L → second igbt Q1B → V-; Output current will rise by 0 gradually; Current sensor increases the voltage signal Vi negative sense that output current converts into, and when negative sense Vi made the first comparator U1A negative input end voltage be lower than the voltage of positive input terminal, the first comparator U1A output became "+" by "-"; The second comparator U1B output becomes "-" by "+"; This moment, the HOB of the first driver module U2 exported high level, LOB output low level, and the HOB output low level of the second driver module U3, LOB export high level, the first igbt Q1A and the 4th igbt Q1D conducting; The 3rd igbt Q1C and the second igbt Q1B end, and circuit working gets into next cycle.
Can know by above-mentioned analysis, during circuit working, flow through amplitude and frequency the triangular current that exchanges in inductance L and the current bus bar by inductance L inductance value and second resistance R 2, the decision of the 4th resistance R 4 voltage ratios.
Referring to Fig. 4 and Fig. 5; The first igbt Q1A and the 4th igbt Q1D drive simultaneously; The 3rd igbt Q1C and the second igbt Q1B drive simultaneously, and drive signal Q1A-G, Q1D-G and Q1C-G, Q1B-G is as shown in the figure on time domain, staggers.
Referring to Fig. 6, the current waveform that exchanges the output of triangular current source generating circuit for 0 be the center, with Im and-Im is the triangular wave of peak value up and down.
In the present embodiment, what current bus bar adopted is and the single-core high-voltage cable of power electronic device system of living in electric pressure; That the acp chip of the first driver module U2 and the second driver module U3 adopts is IR2111.
More than show and described basic principle of the utility model and the advantage of principal character and the utility model.The technical staff of the industry should understand; The utility model is not restricted to the described embodiments; The principle of describing in the foregoing description and the specification that the utility model just is described; Under the prerequisite that does not break away from the utility model spirit and scope, the utility model also has various changes and modifications, and these variations and improvement all fall in the utility model scope that requires protection.The utility model requires protection range to be defined by appending claims and equivalent thereof.
Claims (6)
1. a high pressure is isolated distributed driving power, it is characterized in that, comprises exchanging triangular current source generating circuit, current bus bar, being provided with an isolation current transformer and the out-put supply module that is connected with corresponding isolation Current Transformer Secondary side at least;
Said interchange triangular current source generating circuit comprises that being used for current conversion is the testing circuit of voltage signal, the triangular current control circuit that is connected with the testing circuit output, the drive circuit that is connected with triangular current control circuit output, the bridge conversion circuit that is connected with the drive circuit output and the current rectifying and wave filtering circuit that is arranged on the bridge conversion circuit input;
Said current bus bar runs through isolates current transformer and forms the closed-loop path with testing circuit and bridge conversion circuit.
2. high pressure according to claim 1 is isolated distributed driving power; It is characterized in that said bridge conversion circuit comprises first igbt, second igbt, the 3rd igbt, the 4th igbt and inductance;
The said first igbt source electrode connects the drain electrode of second igbt, its public termination inductance one end, another termination current bus bar one end of said inductance;
Said the 3rd igbt source electrode connects the drain electrode of the 4th igbt, its public termination current bus bar other end;
Said first igbt drain electrode is connected its public termination current rectifying and wave filtering circuit one output with the drain electrode of the 3rd igbt;
The said second igbt source electrode is connected with the 4th igbt source electrode, its public another output of termination current rectifying and wave filtering circuit.
3. high pressure according to claim 2 is isolated distributed driving power, it is characterized in that, said drive circuit comprises first driver module and second driver module;
Said first driver module connects driving first igbt and second igbt;
Said second driver module connects driving the 3rd igbt and the 4th igbt.
4. high pressure according to claim 3 is isolated distributed driving power, it is characterized in that, said triangular current control circuit comprises first comparator, second comparator, first resistance, second resistance, the 3rd resistance and the 4th resistance;
Said first resistance and the series connection of the 3rd resistance, its public termination first comparator first input end, another termination testing circuit output of said first resistance, said the 3rd resistance other end ground connection;
Said second resistance and the series connection of the 4th resistance, its public termination first comparator second input, the said second resistance other end ground connection, another termination first comparator output terminal of said the 4th resistance;
Said first comparator output terminal connects the first driver module input and the second comparator first input end;
Said second comparator, the second input termination ground connection;
Said second comparator output terminal connects the second driver module input.
5. isolate distributed driving power according to any described high pressure of claim 1 to 4, it is characterized in that, what said testing circuit adopted is current sensor.
6. isolate distributed driving power according to any described high pressure of claim 1 to 4, it is characterized in that, what said current bus bar adopted is single-core high-voltage cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201773583U CN202121509U (en) | 2011-05-30 | 2011-05-30 | High voltage isolation distributed drive power source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201773583U CN202121509U (en) | 2011-05-30 | 2011-05-30 | High voltage isolation distributed drive power source |
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| Publication Number | Publication Date |
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| CN202121509U true CN202121509U (en) | 2012-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011201773583U Expired - Lifetime CN202121509U (en) | 2011-05-30 | 2011-05-30 | High voltage isolation distributed drive power source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102201746A (en) * | 2011-05-30 | 2011-09-28 | 溧阳市恒通电源系统有限公司 | High pressure isolation distributed driving power supply |
-
2011
- 2011-05-30 CN CN2011201773583U patent/CN202121509U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102201746A (en) * | 2011-05-30 | 2011-09-28 | 溧阳市恒通电源系统有限公司 | High pressure isolation distributed driving power supply |
| CN102201746B (en) * | 2011-05-30 | 2013-07-31 | 江苏恒通九州电气有限公司 | High pressure isolation distributed driving power supply |
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| C14 | Grant of patent or utility model | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20120118 Effective date of abandoning: 20130731 |
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| RGAV | Abandon patent right to avoid regrant |