CN202094802U - Interleaved series DC/DC converter current sharing control circuit - Google Patents
Interleaved series DC/DC converter current sharing control circuit Download PDFInfo
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- CN202094802U CN202094802U CN201120196241XU CN201120196241U CN202094802U CN 202094802 U CN202094802 U CN 202094802U CN 201120196241X U CN201120196241X U CN 201120196241XU CN 201120196241 U CN201120196241 U CN 201120196241U CN 202094802 U CN202094802 U CN 202094802U
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Abstract
The utility model discloses an interleaved series DC/DC converter current sharing control circuit of high reliability. The interleaved series DC/DC converter current sharing control circuit includes an input direct voltage, a plurality of DC/DC modules, a filter circuit, a load, and a control circuit. The DC/DC module includes a switch circuit, and the control circuit includes a comparison circuit, a signal processing circuit, and a driving circuit. Under the condition that the current sharing control circuit is not added with other hardware circuits, the current sharing control circuit can control an outer tube in the switch circuit after carrying out the signal processing to output currents (I1 and I2) of the DC/DC modules via a CPU (the comparison circuit and the signal processing circuit), thus commendably realizing the balance of a parallel output current. The reliability of the current is excellent, so the interleaved series DC/DC converter current sharing control circuit is especially suitable for the current sharing control of a direct current converter which is input with a high voltage big current and outputs a low voltage big current.
Description
Technical field
The utility model relates to a kind of interleaved series DC/DC converter equalizing control circuit.
Background technology
At present, the DC/DC converter of high voltage input and low-voltage large current output type is widely applied to a plurality of fields such as communication power supply, system alkali metallurgical industry and space power system.In order to realize the output of big electric current, generally take the mode of crisscross parallel to realize, because each module divides equally total power output, thereby make individual module design and system design more simple, the reliability of whole system is improved; Yet, during the operation of module crisscross parallel, because the otherness of parameter, make the electric current of its output impossible just the same, cause some module overload, some module load kicks the beam, and makes the stability of whole system reduce, thereby makes the output current of crisscross parallel module realize that current-sharing is a problem that must solve that improves alternation parallel DC/DC converter stability.
The utility model content
The technical problems to be solved in the utility model is to overcome the deficiencies in the prior art, a kind of alternation parallel DC/DC converter equalizing control circuit is provided, this equalizing control circuit under the situation that does not increase other hardware circuit, by CPU to the output current of DC/DC module (
I 1With
I 2) carry out after the signal processing outer tube in the switching circuit being controlled, realize the equilibrium of output current in parallel well, and current stability is good, be particularly suitable for sharing control to the DC converter of the big electric current of input high voltage output LOW voltage.
The technical solution of the utility model is: a kind of interleaved series DC/DC converter equalizing control circuit, comprise input direct voltage, the DC/DC module, filter circuit, load and control circuit, described DC/DC module comprises first module and second module, the input of the input of described first module and the second module described input direct voltage that is connected in parallel, be connected described filter circuit and load after the output series connection of the output of described first module and second module, described first module and second module all include switching circuit, described control circuit is to the control signal of switching circuit in first module and second module certain angle that staggers, described control circuit comprises comparison circuit, signal processing circuit, drive circuit, the current signal of the output of described first module and second module is imported the difference between current signal described drive circuit of input after described signal processing circuit is handled that obtains behind the described comparison circuit, and the drive signal of described drive circuit output is connected to described switching circuit.
Further, described first module is two three level DC/DC modules that structure is identical with second module, with the outer tube in the switching circuit wherein as control valve.
As a kind of specific embodiment, described three level DC/DC modules are tri-level half-bridge isolated form topological structure; Switching tube S1, S4 in described first module in the switching circuit are outer tube, and switching tube S2, S3 are interior pipe, and the drive signal of described drive circuit connects the control utmost point of described outer tube.
As another kind of specific embodiment, described three level DC/DC modules are three level full-bridge isolated form topological structures; Switching tube S11, S14, S15, S18 in described first module in the switching circuit are outer tube, and switching tube S12, S13, S16, S17 are interior pipe, and the drive signal of described drive circuit connects the control utmost point of described outer tube.
Further, described signal processing circuit is realized by DSP or singlechip control chip.
Further, described first module is identical with the switching frequency of second module.
Further, the outer tube in the switching circuit turn-offs prior to interior pipe in described first module and second module.
Based on above-mentioned equalizing control circuit control method, its controlled step comprises: the output current of first module of sampling
I 1Output current with second module
I 2The output comparison circuit compares, after its electric current difference △ I is handled, through the time of drive circuit amplification with the outer tube turn-on and turn-off in the control switch circuit, to regulate the output current of each module.
Concrete, when
I 2＞
I 1The time, drive circuit is controlled the outer tube of switching circuit in second module, reducing the ON time of outer tube, thereby reduces the output voltage of second module
I 2When
I 2＜
I 1The time, drive circuit is controlled the outer tube of switching circuit in first module, reducing the ON time of outer tube, thereby reduces the output voltage of first module
I 1
The beneficial effects of the utility model are: the utility model is realized control to output current by the time of the turn-on and turn-off of control tri-level circuit outer tube, thereby reach the purpose that realizes current-sharing by self electric current difference, mentality of designing is simple, and only need the outer tube of tri-level circuit is controlled the effect that just can reach current-sharing, not needing on hardware structure increases more peripheral circuit, is high equalizing control circuit of a kind of good stability and reliability and control method.
Description of drawings
Fig. 1 is the input crisscross parallel output-parallel three level DC/DC transposer block schematic diagrames of topography module for the isolated form DC/DC converter that the utility model adopted;
Fig. 2 is the schematic diagram of the input crisscross parallel output-parallel three level DC/DC converter current-sharing control methods of employing Fig. 1;
Fig. 3 is applied to the schematic diagram of crisscross parallel three level DC/DC converters that tri-level half-bridge is the input crisscross parallel output-parallel combination of topography module for the method that adopts Fig. 2;
Fig. 4 is the control section circuit diagram of Fig. 3;
Fig. 5 is applied to the schematic diagram of crisscross parallel three level DC/DC converters that three level full-bridges are the input crisscross parallel output-parallel combination of topography module for the method that adopts Fig. 2;
Fig. 6 is the control section circuit diagram of Fig. 5.
Main designation in the above-mentioned accompanying drawing:
V InThe high-voltage DC power supply of expression input;
V oThe low-voltage dc power supply of expression output;
C fBe filter capacitor;
I 1Output current for DC/DC module 1;
I 2Output current for DC/DC module 2; △ I is
I 2With
I 1Difference; Among Fig. 3, S1 ~ S4 is the switching tube of DC/DC module 1, and S1 and S4 are outer tube, and S2 and S3 are interior pipe; S5 ~ S8 is the switching tube of DC/DC module 2, and S5 and S8 are outer tube, and S6 and S7 are interior pipe; Among Fig. 4, S11 ~ S18 is the switching tube of DC/DC module 1, and S11, S14, S15 and S18 are outer tube, and S12, S13, S16, S17 are interior pipe; S21 ~ S28 is the switching tube of DC/DC module 2, and S21, S24, S25 and S28 are outer tube, and S22, S23, S26, S27 are interior pipe.
Embodiment
The mode that the utility model adopts two identical DC/DC modules of structure to connect by the output of input crisscross parallel is combined into interleaved series DC/DC converter, under the prerequisite that does not increase power device stress and power consumption, obtain higher power output, better output current frequency spectrum and littler output current ripple; On first module basis identical with the switching frequency of second module (being the DC/DC module 1 and DC/DC module 2 in the accompanying drawing), the output current of two DC/DC modules of sampling
I 2With
I 1Both difference △ I by after the signal processing, is amplified through overdrive circuit the outer tube in the switching circuit is carried out the control of turn-on and turn-off time, to realize DC/DC module output current regulating, reach the purpose of electric current current-sharing, and then improve the reliability and stability of system.Be appreciated that the utility model also can expand to a plurality of DC/DC modules.
Be described in further detail below in conjunction with drawings and the specific embodiments.
Fig. 1 is the block diagram of interleaved series three level DC/DC converters of the input crisscross parallel output tandem compound of topography module for isolated form three level DC/DC converters that the utility model adopted, takes the combined converter of the input crisscross parallel output series connection of 2 DC/DC modules as shown in Figure 1 can be with the high-voltage DC power supply of input
V InBe transformed to the DC power supply that is fit to the load needs
V oAs shown in Figure 2, when converter is operated in normal load, with the output current of DC/DC module 1 and DC/DC module 2
I 1With
I 2Compare, its difference △ I amplifies through overdrive circuit after by signal processing again the turn-on and turn-off time of the outer tube of tri-level circuit is controlled, and realizes the module output current regulating is reached the purpose of current-sharing.When
I 2 I 1The time, △ I controls the outer tube of DC/DC module 2 by through drive circuit signal being amplified the back again after the signal processing for just, reducing the ON time of module 2 outer tubes, thus the output current of reduction DC/DC module 2
I 2, realize sharing control; When
I 2＜
I 1The time, △ I controls the outer tube of DC/DC module 1 by through drive circuit signal being amplified the back again after the signal processing for negative, reducing the ON time of module 1 outer tube, thus the output current of reduction DC/DC module 1
I 1, realize sharing control.Because the switching frequency of two modules is identical, the amplitude of variation of two-way output current is less relatively, thereby makes the output voltage of two modules
I 2With
I 1Change lessly, and then the current-sharing effect is fine.
Fig. 3 is applied to the schematic diagram of crisscross parallel three level DC/DC converters that tri-level half-bridge is the input crisscross parallel output-parallel combination of topography module for the method that adopts Fig. 2, DC/DC module 1 and DC/DC module 2 adopt the tri-level half-bridge topological structure, two DC/DC modules have identical frequency and 90 ° the phase place of staggering to realize crisscross parallel, S1 ~ S4 is the switching tube of DC/DC module 1, S1 and S4 are outer tube, and S2 and S3 are interior pipe; S5 ~ S8 is the switching tube of DC/DC module 2, and S5 and S8 are outer tube, and S6 and S7 are interior pipe; Fig. 4 is the control section circuit diagram of Fig. 3, the output current of DC/DC module 1
I 1Output current with DC/DC module 2
I 2Difference △ I by signal processing, after drive circuit amplifies signal, S1 and S4 or S5 and S8 are controlled; When
I 2 I 1The time, △ I is being for just, by through drive circuit signal being amplified the back again after the signal processing outer tube S5 and the S8 of DC/DC module 2 controlled, and reducing the ON time of module 2 outer tubes, thus the output voltage of reduction DC/DC module 2, and then output current
I 2Reduce, realize sharing control; When
I 2＜
I 1The time, △ I is for negative, by through drive circuit signal being amplified the back again after the signal processing outer tube S1 and the S4 of DC/DC module 1 controlled, and reducing the ON time of module 1 outer tube, thus the output voltage of reduction DC/DC module 1, and then output current
I 2Reduce, realize sharing control.
Fig. 5 is applied to the schematic diagram of crisscross parallel three level DC/DC converters that three level full-bridges are the input crisscross parallel output-parallel combination of topography module for the method that adopts Fig. 2; DC/DC module 1 and DC/DC module 2 adopt three level full-bridge topologies, two modules have identical frequency and 90 ° the phase place of staggering to realize crisscross parallel, S11 ~ S18 is the switching tube of DC/DC module 1, wherein S11, S14, S15 and S18 are outer tube, and S12, S13, S16, S17 are interior pipe; S21 ~ S28 is the switching tube of DC/DC module 2, and wherein S21, S24, S25 and S28 are outer tube, and S22, S23, S26, S27 are interior pipe; Fig. 6 is the control section circuit diagram of Fig. 5, the output current of DC/DC module 1
I 1Output current with DC/DC module 2
I 2Difference △ I by signal processing, after drive circuit amplifies, S11, S14, S15 and S18 or S21, S24, S25 and S28 are controlled; When
I 2 I 1The time, △ I is for just, and after signal processing, outer tube S21, the S24, S25 and the S28 that amplify DC/DC module 2 through drive circuit control, and reducing the ON time of module 2 outer tubes, thereby reduce the output voltage of DC/DC module 2, and then make output current
I 2Reduce, realize sharing control; When
I 2＜
I 1The time, △ I is for negative, and after signal processing, outer tube S11, the S14, S15 and the S18 that amplify DC/DC module 1 through drive circuit control, and reducing the ON time of module 1 outer tube, thereby reduce the output voltage of DC/DC module 1, and then make output current
I 1Reduce, realize sharing control.
Claims (8)
1. interleaved series DC/DC converter equalizing control circuit, comprise input direct voltage, the DC/DC module, filter circuit, load and control circuit, described DC/DC module comprises first module and second module, the input of the input of described first module and the second module described input direct voltage that is connected in parallel, be connected described filter circuit and load after the output series connection of the output of described first module and second module, described first module and second module all include switching circuit, described control circuit is to the control signal of switching circuit in first module and second module certain angle that staggers, it is characterized in that: described control circuit comprises comparison circuit, signal processing circuit, drive circuit, the current signal of the output of described first module and second module is imported the difference between current signal described drive circuit of input after described signal processing circuit is handled that obtains behind the described comparison circuit, and the drive signal of described drive circuit output is connected to described switching circuit.
2. interleaved series DC/DC converter equalizing control circuit according to claim 1 is characterized in that: described first module is two three level DC/DC modules that structure is identical with second module.
3. interleaved series DC/DC converter equalizing control circuit according to claim 2 is characterized in that: described three level DC/DC modules are tri-level half-bridge isolated form topological structure.
4. interleaved series DC/DC converter equalizing control circuit according to claim 2 is characterized in that: described three level DC/DC modules are three level full-bridge isolated form topological structures.
5. interleaved series DC/DC converter equalizing control circuit according to claim 1, it is characterized in that: described first module is identical with the switching frequency of second module.
6. interleaved series DC/DC converter equalizing control circuit according to claim 1, it is characterized in that: the outer tube in described first module and second module in the switching circuit is as control valve.
7. interleaved series DC/DC converter equalizing control circuit according to claim 1, it is characterized in that: the outer tube in described first module and second module in the switching circuit turn-offs prior to interior pipe.
8. according to each described interleaved series DC/DC converter equalizing control circuit of claim 1 to 7, it is characterized in that: described signal processing circuit is realized by DSP or singlechip control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120196241XU CN202094802U (en) | 2011-06-13 | 2011-06-13 | Interleaved series DC/DC converter current sharing control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120196241XU CN202094802U (en) | 2011-06-13 | 2011-06-13 | Interleaved series DC/DC converter current sharing control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202094802U true CN202094802U (en) | 2011-12-28 |
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|---|---|---|---|
| CN201120196241XU Expired - Fee Related CN202094802U (en) | 2011-06-13 | 2011-06-13 | Interleaved series DC/DC converter current sharing control circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102215001A (en) * | 2011-06-13 | 2011-10-12 | 珠海泰坦新能源系统有限公司 | Flow-equalizing control circuit and control method of interleaved series direct current (DC) / DC converter |
| CN104935156A (en) * | 2015-06-26 | 2015-09-23 | 长沙广义变流技术有限公司 | Dynamic current sharing control method and circuit |
| CN105871243A (en) * | 2016-05-04 | 2016-08-17 | 深圳市勤为电气有限公司 | Three-phase three-wire energy bidirectional AC-DC converter |
-
2011
- 2011-06-13 CN CN201120196241XU patent/CN202094802U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102215001A (en) * | 2011-06-13 | 2011-10-12 | 珠海泰坦新能源系统有限公司 | Flow-equalizing control circuit and control method of interleaved series direct current (DC) / DC converter |
| CN104935156A (en) * | 2015-06-26 | 2015-09-23 | 长沙广义变流技术有限公司 | Dynamic current sharing control method and circuit |
| CN104935156B (en) * | 2015-06-26 | 2016-03-30 | 长沙广义变流技术有限公司 | A kind of dynamic current equalizing control method and circuit |
| CN105871243A (en) * | 2016-05-04 | 2016-08-17 | 深圳市勤为电气有限公司 | Three-phase three-wire energy bidirectional AC-DC converter |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111228 Termination date: 20140613 |
|
| EXPY | Termination of patent right or utility model |