CN104868724A - Mixed-mode modulation method for multi-phase staggered bidirectional DC converter - Google Patents
Mixed-mode modulation method for multi-phase staggered bidirectional DC converter Download PDFInfo
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- CN104868724A CN104868724A CN201510246583.0A CN201510246583A CN104868724A CN 104868724 A CN104868724 A CN 104868724A CN 201510246583 A CN201510246583 A CN 201510246583A CN 104868724 A CN104868724 A CN 104868724A
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Abstract
The invention discloses a mixed-mode modulation method for a multi-phase staggered bidirectional DC converter. If the direction of a power flow is from SV1 to SV2, a switching tube Q12 and a switching tube Q22 apply driving square waves with a 180-degree phase shift difference, and then the switching tube Q12 and the switching tube Q22 are closed. If the direction of the power flow is from SV2 to SV1, the switching tube Q12 and the switching tube Q22 apply driving square waves with a 180-degree phase shift difference, and then the switching tube Q12 and the switching tube Q22 are closed. If input power is within the range from half load to full load, the range of the duty ratio of the driving square waves of the switching tube Q12 and the switching tube Q22 is from 0 to 0.5. If the input power is within the range from zero load to half load, the range of the duty ratio of the driving square waves of the switching tube Q12 and the switching tube Q22 is from 0 to 1. An inductance optimization design is that the bidirectional DC converter works at a critical point between continuous connection and interrupted connection during half load. The method integrates the advantages of working modes of continuous connection and interrupted connection of the multi-phase staggered bidirectional DC converter, and enables the working mode to be switched according to the range of output power, so as to improve the full-power range efficiency. Meanwhile, the method reduces inductance when an input current ripple is met, and improves the power density.
Description
Technical field
The present invention relates to two-way DC converter, particularly a kind of mixed-mode modulation method of heterogeneous staggered bi-directional DC converter.
Background technology
As one of the key technology of energy-storage system, distributed power generation and electric automobile, power inverter wants that cube is little, lightweight, stable performance, system are reliable, and has high power density and excellent dynamic control performance.Particularly in the application of large power, electrically electrical automobile, the large power energy storage inductance of two-way DC converter is its critical component, and it accounts for substantial volume and the weight of system, designs big current, powerful energy storage inductor is a difficulty and challenging work.
Two-phase staggered bi-directional DC converter shown in Fig. 1, can reduce the volume and weight of converter, and improve the reliability of system, is the first-selected topological structure of high-power applications.Its particular circuit configurations comprises two two-way DC converters: the converter 1 of inductance L 1, switching tube Q11 and Q12 composition, the converter 2 of inductance L 2, switching tube Q21 and Q22 composition; DC filter capacitor Co.For reducing the volume of converter particularly inductance, need to adopt less inductance value; But the obvious input current ripple of the too little easy generation of inductance, affects the working life of energy-storage battery.Therefore converter inductance value must be optimized.Consider the depth of discharge of energy-storage battery, current transformer will work in wider voltage and power bracket simultaneously, easily loses Sofe Switch characteristic at some operation interval converter, produces obvious reactive power and circulation, reduces power conversion efficiency.Consider and there is multiple-working mode within the scope of middle low power; And the output power range of each mode of operation, Sofe Switch and reactive current distribution etc. also exist obvious difference, cause the different working modes of identical modulation strategy to there is huge difference to the performance of current transformer efficiency optimization, therefore how to determine that the optimum mode of operation under many phase shift modulation strategy becomes another difficult problem urgently to be resolved hurrily.
Summary of the invention
For overcoming the defect of above-mentioned prior art, the invention provides a kind of mixed-mode modulation method of heterogeneous staggered bi-directional DC converter.
Technical scheme of the present invention is:
A mixed-mode modulation method for heterogeneous staggered bi-directional DC converter, described modulator approach comprises step:
(1) first according to poower flow direction, the driving square wave of four switching tubes Q11, Q12, Q21, Q22 is set: if poower flow direction is from VS1 to VS2, switching tube Q12 and Q22 applies PWM and drives square wave, and the driving square wave of switching tube Q22 has 180 ° of phase shifts relative to Q12, switching tube Q11 and Q21 closes by its anti-paralleled diode afterflow; If poower flow direction is from VS2 to VS1, switching tube Q11 and Q21 applies PWM and drives square wave, and the driving square wave of switching tube Q21 has 180 ° of phase shifts relative to Q12, and switching tube Q12 and Q22 closes by its anti-paralleled diode afterflow; Following steps are the situation of poower flow from VS1 to VS2;
(2) if input power range is partly downloaded to fully loaded, two-way DC converter adopts continuous ON operation pattern, and the PWM of switching tube Q12 and Q22 drives the scope of duty cycle square wave to be [0,0.5];
(3) if input power range is from zero load to semi-load, two-way DC converter adopts Discontinuous Conduction mode of operation, and the PWM of switching tube Q12 and Q22 drives the scope of duty cycle square wave to be [0,1];
(4), when inductance value optimal design is two-way DC converter semi-load, the critical point of continuous conducting and Discontinuous Conduction is worked in.
Advantage of the present invention is:
The mixed-mode modulation method of heterogeneous staggered bi-directional DC converter provided by the present invention, combine the continuous ON operation pattern of heterogeneous staggered DC converter and the advantage of Discontinuous Conduction mode of operation, can according to output power range switching working mode to improve total power range efficiency, simultaneously reduce inductance value meeting under input current ripple condition, improve power density.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
The topological structure schematic diagram of the heterogeneous staggered bi-directional DC converter that Fig. 1 controls for the inventive method;
The switch drive sequential chart of continuous ON operation pattern and exemplary operation waveform when Fig. 2 is two-phase staggered bi-directional DC converter of the present invention heavy duty;
The switch drive sequential chart of Discontinuous Conduction mode of operation and exemplary operation waveform when Fig. 3 is two-phase staggered bi-directional DC converter underloading of the present invention.
Embodiment
The topological structure schematic diagram of the heterogeneous staggered bi-directional DC converter that Fig. 1 controls for the inventive method, its particular circuit configurations comprises two two-way DC converters: the converter 1 of inductance L 1, switching tube Q11 and Q12 composition, the converter 2 of inductance L 2, switching tube Q21 and Q22 composition; Inductance L 1 is connected power supply VS1 with L2, and four switching tubes connect DC filter capacitor Co and power supply VS2.
The mixed-mode modulation method of disclosed heterogeneous staggered bi-directional DC converter, described modulator approach comprises step:
(1) first according to poower flow direction, the driving square wave of four switching tubes Q11, Q12, Q21, Q22 is set: if poower flow direction is from VS1 to VS2, switching tube Q12 and Q22 applies PWM and drives square wave, and the driving square wave of switching tube Q22 has 180 ° of phase shifts relative to Q12, switching tube Q11 and Q21 closes by its anti-paralleled diode afterflow; If poower flow direction is from VS2 to VS1, switching tube Q11 and Q21 applies PWM and drives square wave, and the driving square wave of switching tube Q21 has 180 ° of phase shifts relative to Q12, and switching tube Q12 and Q22 closes by its anti-paralleled diode afterflow; Following steps are the situation of poower flow from VS1 to VS2, and the situation of poower flow from VS1 to VS2 is similar with it;
(2) if input power range is partly downloaded to fully loaded, two-way DC converter adopts continuous ON operation pattern, and the PWM of switching tube Q12 and Q22 drives the scope of duty cycle square wave to be [0,0.5]; As shown in Figure 2, be switch drive sequential chart and the exemplary operation waveform of continuous ON operation pattern during two-phase staggered bi-directional DC converter heavy duty of the present invention;
(3) if input power range is from zero load to semi-load, two-way DC converter adopts Discontinuous Conduction mode of operation, and the PWM of switching tube Q12 and Q22 drives the scope of duty cycle square wave to be [0,1]; As shown in Figure 3, be switch drive sequential chart and the exemplary operation waveform of Discontinuous Conduction mode of operation during two-phase staggered bi-directional DC converter underloading of the present invention.
(4), when inductance value optimal design is two-way DC converter semi-load, the critical point of continuous conducting and Discontinuous Conduction is worked in.
The above, be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto.In the technical scope that the present invention discloses, arbitrary change and replacement, all should be encompassed within protection scope of the present invention.The unspecified part of the present invention, belongs to general knowledge as well known to those skilled in the art.
Claims (1)
1. a mixed-mode modulation method for heterogeneous staggered bi-directional DC converter, is characterized in that, described modulator approach comprises step:
(1) first according to poower flow direction, the driving square wave of four switching tubes Q11, Q12, Q21, Q22 of two-way DC converter is set: if poower flow direction is from VS1 to VS2, switching tube Q12 and Q22 applies PWM and drives square wave, and the driving square wave of switching tube Q22 has 180 ° of phase shifts relative to Q12, switching tube Q11 and Q21 closes by its anti-paralleled diode afterflow; If poower flow direction is from VS2 to VS1, switching tube Q11 and Q21 applies PWM and drives square wave, and the driving square wave of switching tube Q21 has 180 ° of phase shifts relative to Q12, and switching tube Q12 and Q22 closes by its anti-paralleled diode afterflow; Following steps are the situation of poower flow from VS1 to VS2;
(2) if input power range is partly downloaded to fully loaded, two-way DC converter adopts continuous ON operation pattern, and the PWM of switching tube Q12 and Q22 drives the scope of duty cycle square wave to be [0,0.5];
(3) if input power range is from zero load to semi-load, two-way DC converter adopts Discontinuous Conduction mode of operation, and the PWM of switching tube Q12 and Q22 drives the scope of duty cycle square wave to be [0,1];
(4), when inductance value optimal design is two-way DC converter semi-load, the critical point of continuous conducting and Discontinuous Conduction is worked in.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510246583.0A CN104868724A (en) | 2015-05-15 | 2015-05-15 | Mixed-mode modulation method for multi-phase staggered bidirectional DC converter |
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| CN201510246583.0A CN104868724A (en) | 2015-05-15 | 2015-05-15 | Mixed-mode modulation method for multi-phase staggered bidirectional DC converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108333531A (en) * | 2018-01-26 | 2018-07-27 | 郑州云海信息技术有限公司 | A kind of multiphase switch power source efficiency debugging apparatus, method and system |
| CN114884360A (en) * | 2022-04-22 | 2022-08-09 | 电子科技大学 | Optimal reactive power bidirectional modulation strategy applicable to wide-range scenes |
-
2015
- 2015-05-15 CN CN201510246583.0A patent/CN104868724A/en active Pending
Non-Patent Citations (2)
| Title |
|---|
| 孙文: "用于电动汽车的交错并联双向DC/DC变换器设计", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
| 戴瑶: "一种单电感多输出（SIMO)的AMOLED驱动电路研究与设计", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108333531A (en) * | 2018-01-26 | 2018-07-27 | 郑州云海信息技术有限公司 | A kind of multiphase switch power source efficiency debugging apparatus, method and system |
| CN114884360A (en) * | 2022-04-22 | 2022-08-09 | 电子科技大学 | Optimal reactive power bidirectional modulation strategy applicable to wide-range scenes |
| CN114884360B (en) * | 2022-04-22 | 2023-04-14 | 电子科技大学 | Optimal reactive power bidirectional modulation strategy applicable to wide-range scene |
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