CN102214999A - Voltage-equalizing control circuit and control method of interleaved series direct current (DC) / DC converter - Google Patents
Voltage-equalizing control circuit and control method of interleaved series direct current (DC) / DC converter Download PDFInfo
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- CN102214999A CN102214999A CN2011101567171A CN201110156717A CN102214999A CN 102214999 A CN102214999 A CN 102214999A CN 2011101567171 A CN2011101567171 A CN 2011101567171A CN 201110156717 A CN201110156717 A CN 201110156717A CN 102214999 A CN102214999 A CN 102214999A
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Abstract
The invention discloses a voltage-equalizing control circuit and a control method of an interleaved series direct current (DC) / DC converter. The circuit and the method are high in stability. The voltage-equalizing control circuit of the interleaved series DC/DC converter comprises an input DC voltage, a plurality of DC/DC modules, a filtering circuit, a load and a control circuit, wherein the DC/DC modules comprise switch circuits; the control circuit comprises a comparison circuit, a signal processing circuit and a driving circuit; a voltage difference signal which is obtained by inputting an output voltage signal of each DC/DC module into the comparison circuit is processed by the signal processing circuit and then input into the driving circuit; a driving signal which is output by the driving circuit is connected to a control electrode of a corresponding switch pipe in the switch circuit; and the control on an output voltage is realized by controlling the on and off time of an external pipe in the switch circuit.
Description
Technical field
The present invention relates to a kind of interleaved series DC/DC converter voltage-equalizing control circuit and control method.
Background technology
At present, the DC/DC converter of high pressure input high voltage-small current output type is widely applied to a plurality of fields such as electric automobile charging station, data center.In order to realize the output of big voltage, generally take the mode of interleaved series 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 interleaved series, because the otherness of parameter, make the voltage 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 voltage of interleaved series module realize that all pressure is to improve a problem that must solve of interleaved series DC/DC converter stability.Summary of the invention
Problem to be solved by this invention is the defective that overcomes above-mentioned prior art, provides a kind of stability high interleaved series DC/DC converter voltage-equalizing control circuit and control method.
Technical scheme of the present invention is: a kind of interleaved series DC/DC converter voltage-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 output voltage signal of described first module and second module is imported the pressure difference 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.
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.
The control method that the present invention relates to is based on above-mentioned voltage-equalizing control circuit, and its controlled step comprises: the output voltage of first module of sampling
U 1Output voltage with second module
U 2The input comparison circuit compares, after its pressure reduction △ U 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 voltage of each module.
Concrete, when
U 2＞
U 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
U 2When
U 2＜
U 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
U 1
The invention has the beneficial effects as follows: the present invention realizes control to output voltage by the time of the turn-on and turn-off of control tri-level circuit outer tube, thereby reach the purpose of all pressing, mentality of designing is simple, and only need the outer tube of tri-level circuit controlled and just can reach all the effect of pressing, not needing on hardware structure increases more peripheral circuit, is high voltage-equalizing control circuit of a kind of good stability and reliability and control method.
Description of drawings
Fig. 1 is input crisscross parallel output series connection three level DC/DC transposer block schematic diagrames of the present invention;
Fig. 2 exports the schematic diagram of series connection three level DC/DC converter pressure equalizing control methods for the input crisscross parallel that adopts Fig. 1;
Fig. 3 is applied to the schematic diagram of interleaved series three level DC/DC converters that tri-level half-bridge is the input crisscross parallel output tandem compound of topography module for the method that adopts Fig. 2;
Fig. 4 is the control circuit schematic diagram at Fig. 3;
Fig. 5 is applied to the schematic diagram of interleaved series three level DC/DC converters that three level full-bridges are the input crisscross parallel output tandem compound of topography module for the method that adopts Fig. 2;
Fig. 6 is the schematic diagram at the control circuit of Fig. 5.
Main designation in the above-mentioned accompanying drawing:
U InThe high-voltage DC power supply of expression input;
U oThe low-voltage dc power supply of expression output;
C fBe filter capacitor;
U 1Output voltage for DC/DC module 1;
U 2Output voltage for DC/DC module 2; △ U is
U 2With
U 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 present invention 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 voltage frequency spectrum and littler output voltage 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 voltage of two DC/DC modules of sampling
U 1With
U 2Both difference △ U 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 the adjusting to DC/DC module output voltage, reach the purpose that voltage is all pressed, and then improve the reliability and stability of system.Be appreciated that the present invention also can expand to a plurality of DC/DC modules.
Be described in further detail below in conjunction with drawings and the specific embodiments.
The input crisscross parallel that Fig. 1 is a topography module for isolated form three level DC/DC converters of the present invention is exported the block diagram of the interleaved series three level DC/DC converters of tandem compound, among the figure
U InThe high-voltage DC power supply of expression input,
U oThe low-voltage dc power supply of expression output,
C fBe filter capacitor,
U 1Be the output voltage of DC/DC module 1,
U 2Be the output voltage of DC/DC module 2, take the combined converter of the input crisscross parallel output series connection of 2 DC/DC modules as shown in Figure 1 the high-voltage DC power supply of input can be transformed to the DC power supply that is fit to the load needs.As shown in Figure 2, when converter is operated in normal load, with the output voltage of DC/DC module 1 and DC/DC module 2
U 1With
U 2Compare, its difference △ U 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 adjusting to the module output voltage, reaches the purpose of all pressing.When
U 2 U 1The time, △ U 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 voltage of reduction DC/DC module 2
U 2, realize Pressure and Control; When
U 2＜
U 1The time, △ U 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 voltage of reduction DC/DC module 1
U 1, realize Pressure and Control.Because the switching frequency of two modules is identical, the amplitude of variation of two output voltage is less relatively, thereby makes the output voltage of two modules
U 1With
U 2Change lessly, and then all press effect fine.
Fig. 3 is applied to the schematic diagram of interleaved series three level DC/DC converters that tri-level half-bridge is the input crisscross parallel output tandem compound of topography module for the method that adopts Fig. 2, the identical tri-level half-bridge topological structure that all adopts of DC/DC module 1, two DC/DC modules with DC/DC module 2 structures have identical frequency and 90 ° the phase place of staggering to realize interleaved series.With wherein DC/DC module 1 is example, it comprises bleeder circuit, clamp circuit, switching circuit, resonant circuit, isolating transformer T1 and rectification circuit, described bleeder circuit comprises dividing potential drop capacitor C 1 and dividing potential drop capacitor C 2, be connected in parallel on the input of the DC/DC module 1 that the input direct voltage two ends become after 2 series connection of dividing potential drop capacitor C 1 and dividing potential drop capacitor C, described clamp circuit comprises diode D1 and diode D2, the positive pole of diode D1 is connected with the negative pole of diode D2 and is connected with ground wire with the series connection point of dividing potential drop capacitor C 1 and dividing potential drop capacitor C 2, described switching circuit is by switching tube S1, switching tube S2, switching tube S3, switching tube S4 is in series, S1 and S4 are outer tube, and S2 and S3 are interior pipe; Similarly 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.Described switching circuit is in parallel with bleeder circuit, switching tube S1 is connected the negative pole of diode D1 with the series connection point of switching tube S2, switching tube S3 is connected the positive pole of diode D2 with the series connection point of switching tube S4, described resonant circuit comprises resonant capacitance C11, resonant capacitance C12, resonant inductance Ls1 and magnetizing inductance Lm1, it is in parallel after resonant capacitance C11 connects with resonant capacitance C12 with described switching circuit, the end of resonant inductance Ls1 connects the series connection point of switching tube S2 and switching tube S3, the other end of resonant inductance Ls1 connects the end of magnetizing inductance Lm1, the other end of magnetizing inductance Lm1 connects the series connection point of resonant capacitance C11 and resonant capacitance C12, described rectification circuit is by four rectifier diode D11, D12, D13, D14 forms bridge rectifier, elementary and the described magnetizing inductance Lm1 of described isolating transformer T1 is in parallel, the ac input end of the secondary connection bridge rectifier of described isolating transformer T1, the dc output end of this bridge rectifier connects filter capacitor
C fWith load R.
Fig. 4 is the control section circuit diagram of Fig. 3, the output voltage of DC/DC module 1
U 1Output voltage with DC/DC module 2
U 2Difference △ U by signal processing, after drive circuit amplifies signal, S1 and S4 or S5 and S8 are controlled; When
U 2 U 1The time, △ U 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
U 2, realize Pressure and Control; When
U 2＜
U 1The time, △ U 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
U 1, realize Pressure and Control.
Fig. 5 is applied to the schematic diagram of interleaved series three level DC/DC converters that three level full-bridges are the input crisscross parallel output tandem compound 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 interleaved series, 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 voltage of DC/DC module 1
U 1Output voltage with DC/DC module 2
U 2Difference △ U by signal processing, after drive circuit amplifies, S11, S14, S15 and S18 or S21, S24, S25 and S28 are controlled; When
U 2 U 1The time, △ U 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
U 2, realize Pressure and Control; When
U 2＜
U 1The time, △ U 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
U 1, realize Pressure and Control.
Claims (9)
1. interleaved series DC/DC converter voltage-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 output voltage signal of described first module and second module is imported the pressure difference 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 voltage-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 voltage-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 voltage-equalizing control circuit according to claim 3, it is characterized in that: the switching tube (S1, S4) in described first module in the switching circuit is an outer tube, switching tube (S2, S3) is interior pipe, and the drive signal of described drive circuit connects the control utmost point of described outer tube.
5. interleaved series DC/DC converter voltage-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.
6. interleaved series DC/DC converter voltage-equalizing control circuit according to claim 5, it is characterized in that: the switching tube (S11, S14, S15, S18) in described first module in the switching circuit is an outer tube, switching tube (S12, S13, S16, S17) is interior pipe, and the drive signal of described drive circuit connects the control utmost point of described outer tube.
7. according to each described interleaved series DC/DC converter voltage-equalizing control circuit of claim 1 to 6, it is characterized in that: described signal processing circuit is realized by DSP or singlechip control chip.
8. one kind is utilized the described voltage-equalizing control circuit of claim 1 to realize that described interleaved series DC/DC converter all presses the control method of output, it is characterized in that controlled step comprises: the output voltage of first module of sampling
U 1Output voltage with second module
U 2The input comparison circuit compares, after its pressure reduction △ U 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 voltage of each module.
9. control method according to claim 8 is characterized in that, when
U 2＞
U 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
U 2When
U 2＜
U 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
U 1
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| CN102624056A (en) * | 2012-03-29 | 2012-08-01 | 青岛易特优电子有限公司 | Charge-discharge control device for electric automobile capacitor |
| CN102638164A (en) * | 2012-05-03 | 2012-08-15 | 无锡联动太阳能科技有限公司 | High boost circuit, solar inverter and solar cell system |
| CN103248239A (en) * | 2012-02-09 | 2013-08-14 | 国际商业机器公司 | Integrated transformers |
| CN103441693A (en) * | 2013-08-13 | 2013-12-11 | 华北电力大学（保定） | Grid-connected photovoltaic power generation micro inverter and control method thereof |
| CN105553271A (en) * | 2016-03-04 | 2016-05-04 | 盐城工学院 | Control method of three-phase DC converter |
| CN105576985A (en) * | 2016-03-04 | 2016-05-11 | 盐城工学院 | Control method of DC-DC converter |
| CN105656313A (en) * | 2016-03-04 | 2016-06-08 | 盐城工学院 | Control method of three-phase direct current-direct current converter |
| CN106160457A (en) * | 2015-04-17 | 2016-11-23 | 台达电子工业股份有限公司 | DC converter and How It Works thereof |
| CN106411133A (en) * | 2016-06-28 | 2017-02-15 | 东文高压电源（天津）股份有限公司 | Efficient high-power quasi double-tube parallel driving high-voltage power supply circuit |
| CN106452091A (en) * | 2016-12-02 | 2017-02-22 | 中国船舶重工集团公司第七〇九研究所 | Tri-level double-end active bridge DC (Direct Current) conversion device and control method |
| CN110323667A (en) * | 2019-05-06 | 2019-10-11 | 北京雷动智创科技有限公司 | A kind of superpower laser drive electric power unit |
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| CN103248239B (en) * | 2012-02-09 | 2016-03-02 | 国际商业机器公司 | Integrated transformer |
| CN102624056A (en) * | 2012-03-29 | 2012-08-01 | 青岛易特优电子有限公司 | Charge-discharge control device for electric automobile capacitor |
| CN102638164A (en) * | 2012-05-03 | 2012-08-15 | 无锡联动太阳能科技有限公司 | High boost circuit, solar inverter and solar cell system |
| CN102638164B (en) * | 2012-05-03 | 2015-01-21 | 无锡联动太阳能科技有限公司 | High boost circuit, solar inverter and solar cell system |
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| CN103441693B (en) * | 2013-08-13 | 2015-07-22 | 华北电力大学（保定） | Grid-connected photovoltaic power generation micro inverter and control method thereof |
| CN106160457A (en) * | 2015-04-17 | 2016-11-23 | 台达电子工业股份有限公司 | DC converter and How It Works thereof |
| CN106160457B (en) * | 2015-04-17 | 2019-03-29 | 台达电子工业股份有限公司 | DC converter and its operation method |
| CN105576985A (en) * | 2016-03-04 | 2016-05-11 | 盐城工学院 | Control method of DC-DC converter |
| CN105656313A (en) * | 2016-03-04 | 2016-06-08 | 盐城工学院 | Control method of three-phase direct current-direct current converter |
| CN105576985B (en) * | 2016-03-04 | 2018-05-25 | 盐城工学院 | A kind of control method of straight convertor |
| CN105553271B (en) * | 2016-03-04 | 2018-06-05 | 盐城工学院 | A kind of control method of three-phase dc converter |
| CN105656313B (en) * | 2016-03-04 | 2018-06-05 | 盐城工学院 | A kind of control method of three-phase straight convertor |
| CN105553271A (en) * | 2016-03-04 | 2016-05-04 | 盐城工学院 | Control method of three-phase DC converter |
| CN106411133A (en) * | 2016-06-28 | 2017-02-15 | 东文高压电源（天津）股份有限公司 | Efficient high-power quasi double-tube parallel driving high-voltage power supply circuit |
| CN106452091A (en) * | 2016-12-02 | 2017-02-22 | 中国船舶重工集团公司第七〇九研究所 | Tri-level double-end active bridge DC (Direct Current) conversion device and control method |
| CN106452091B (en) * | 2016-12-02 | 2018-10-26 | 中国船舶重工集团公司第七一九研究所 | Three level double-end active bridge DC converters of one kind and control method |
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Application publication date: 20111012 |