CN101741259B - Two-way DC converter - Google Patents
Two-way DC converter Download PDFInfo
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- CN101741259B CN101741259B CN2010101025489A CN201010102548A CN101741259B CN 101741259 B CN101741259 B CN 101741259B CN 2010101025489 A CN2010101025489 A CN 2010101025489A CN 201010102548 A CN201010102548 A CN 201010102548A CN 101741259 B CN101741259 B CN 101741259B
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- diode
- inductance
- switching tube
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- power supply
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Abstract
The invention discloses two two-way DC converters, and belongs to the technical field of power electronics converters. The two two-way DC converters are in a boosting-bucking type and a boosting bucking type respectively. A circuit structure comprises a first power supply and a second power supply (V1 and V2), a first filter capacitor and a second filter capacitor (C1, C2), a first diode and a second diode (D1 and D2), a first switching tube and a second switching tube (Q1 and Q2), a first coupling inductor and a second coupling inductor (Lc1, Lc2) and a filter inductor (L), wherein two coupling inductors are mutually coupled together by sharing an inductance core. Switching tubes converting power in two directions are mutually independent, which avoids the defect that the conversion efficiency is reduced because of reverse recovery of parasitic diodes of the switching tubes when the switching tube of the conventional two-way converter is multiplexed, and improves the reliability of the converter at the same time. When the switching tube in one direction has a fault, the power conversion in other direction cannot be influenced. The converters are particularly suitable for high-voltage and high-power conversion occasions having higher requirements on the conversion efficiency and the reliability.
Description
Technical field
The present invention relates to two kinds of converters, relate in particular to two kinds of two-way DC converters of voltage raising and reducing formula and step-down/up type, belong to the converters technical field.
Background technology
Two-way DC converter is through the bi-cell operation of DC converter; Can realize the transmitted in both directions of energy; On function, being equivalent to two unidirectional DC converters, is typical " dual-use " equipment, needs the mobile occasion of bidirectional energy in uninterrupted power supply power supply, accumulator cell charging and discharging, generation of electricity by new energy and Aero-Space electric power system etc.; Can reduce the volume weight of system significantly, have higher researching value.
Traditional boosting-the buck two-way DC converter is as shown in Figure 1.Switching tube Q
1And Q
2The general switching device that has parasitic body diode that adopts, like MOSFET, when energy during from the high side to low side conversion, Q
1As main switch, Q
2As Q
1Synchronous rectifier, in the Dead Time of switching tube, electric current is from Q
2Parasitic body diode in flow through; When energy from low-pressure side during to the high-pressure side conversion, Q
2As main switch, Q
1As Q
2Synchronous rectifier, in the Dead Time of switching tube, electric current is from Q
1Parasitic body diode in flow through.The switch of general switching tube parasitic body diode and on state characteristic can not show a candle to special-purpose diode; Particularly the QRR of switching tube parasitic body diode is obviously greater than the diode of special use; Cause switching loss very big thus, thereby cause the conversion efficiency of converter to reduce.In order to overcome the reverse loss problem that causes recovered of parasitic body diode, generally take the appropriate design circuit parameter, make that inductive current can both automatic reverse in each switch periods, thus the reverse recovery loss problem of having avoided the parasitic body diode conducting to cause.But in high-power big electric current application scenario, if still adopt such scheme, the switching tube conduction loss that causes thus obviously increases, and still can cause the decline of conversion efficiency.
In order to overcome the problem that the switching tube parasitic body diode causes; Can be through the parasitic body diode of diode blocking swtich pipe; The mode of extra parallelly connected fly-wheel diode again, diode blocking-up formula boost-and the circuit structure of buck two-way DC converter is as shown in Figure 2.When adopting diode blocking-up formula voltage raising and reducing formula two-way DC converter shown in Figure 2, the switching tube diode in series has been introduced conduction loss and has been caused decrease in efficiency on the one hand, and the number of diodes of using on the other hand is multiplied, and has increased cost.
In addition; The use occasion that has requirements at the higher level in reliability to reversible transducer;, the Power Conversion of one of them direction require another direction unaffected when breaking down; Generally take two monotonic transformation devices to be combined into reversible transducer in this case and use, but caused the increase of converter weight and volume owing to the increase of passive devices such as inductance, electric capacity.
Summary of the invention
Technical problem:
The present invention is directed to the defective that two-way DC converter in the background technology exists, and propose two kinds be applicable to high-power conversion occasion, conversion efficiency and the high two-way DC converter of reliability.
Technical scheme:
Of the present invention boosting-buck two-way DC converter; Comprise first and second power supplys; First and second filter capacitors, first and second diodes, first and second switching tubes; First and second coupling inductances and filter inductance; Wherein: the positive output end of first power supply connects an end of first filter capacitor, and the positive output end of second source connects an end of second filter capacitor, and the negative output terminal of first power supply connects the other end of first filter capacitor, the other end of second filter capacitor and the negative output terminal of second source respectively; The drain electrode of first switching tube and the negative electrode of second diode all are connected the positive output end of first power supply; The source electrode of first switching tube connects the negative electrode of first diode and the non-same polarity of first coupling inductance respectively, and the end of the same name of first coupling inductance connects an end of filter inductance and the non-same polarity of second coupling inductance respectively, and the end of the same name of second coupling inductance connects the drain electrode of second switch pipe and the anode of second diode respectively; Filter inductance connects the positive output end of second source, and the anode of first diode connects the source electrode of second switch pipe and the negative output terminal of first and second power supplys respectively.
Step-down/up type two-way DC converter of the present invention; Comprise first and second power supplys; First and second filter capacitors, first and second diodes, first and second switching tubes; First and second coupling inductances and filter inductance; Wherein: the positive output end of first power supply connects an end of first filter capacitor, and the negative output terminal of second source connects an end of second filter capacitor, and the negative output terminal of first power supply connects the other end of first filter capacitor, the other end of second filter capacitor and the positive output end of second source respectively; The drain electrode of first switching tube and the negative electrode of second diode all are connected the positive output end of first power supply; The source electrode of first switching tube connects the negative electrode of first diode and the non-same polarity of first coupling inductance respectively, and the anode of first diode connects the source electrode of second switch pipe and the negative output terminal of second source respectively, and the drain electrode of second switch pipe connects the end of the same name of second coupling inductance and the anode of second diode respectively; The non-same polarity of second coupling inductance connects the end of the same name of first coupling inductance and an end of filter inductance respectively, and the other end of filter inductance connects the negative output terminal of first power supply and the positive output end of second source respectively.
More than first and second coupling inductances in two kinds of two-way DC converters intercouple together through a shared inductance core.
Technique effect:
The present invention boosts-and the buck two-way DC converter is applicable to that an end supply voltage is higher than other end supply voltage and two ends power supply application scenario altogether all the time; The step-down/up type two-way DC converter is applicable to that an end supply voltage can be higher than, is lower than or equals other end supply voltage and the opposite polarity application scenario of two ends supply voltage.Concrete beneficial effect is following:
1) simple in structure, volume and weight is less, and cost is lower;
2) utilize coupling inductance reverse coupled relation, realize that the independence of both direction power circuit is separately carried out;
3) through the switching tube of both direction Power Conversion is separate, the conversion efficiency reduction of having avoided traditional double when the converter switches pipe is multiplexing, to be caused owing to the reverse recovery of switching tube parasitic body diode;
4) when the switching tube fault of one of them direction, the Power Conversion of another direction can be unaffected, improved the reliability and the fault-tolerant ability of converter.
Description of drawings
Fig. 1 is the circuit diagram of traditional voltage raising and reducing formula two-way DC converter.
Fig. 2 is the circuit diagram of diode blocking-up formula voltage raising and reducing formula two-way DC converter.
Fig. 3 boosts-circuit diagram of buck two-way DC converter for the present invention.
Fig. 4 is the circuit diagram of step-down/up type two-way DC converter of the present invention.
Main oscillogram when Fig. 5 is operated in decompression mode for voltage raising and reducing formula two-way DC converter of the present invention.
Fig. 6, Fig. 7 are respectively the present invention and boost-equivalent circuit diagram of different operating mode when the buck two-way DC converter is operated in decompression mode.
Fig. 8 boosts-main oscillogram when the buck two-way DC converter is operated in boost mode for the present invention.
Fig. 9, Figure 10 are respectively the present invention and boost-equivalent electric circuit of different operating mode when the buck two-way DC converter is operated in boost mode.
Designation among Fig. 1～Figure 10: V
1, V
2Be respectively first and second power supplys; C
1, C
2Be respectively first and second filter capacitors; Q
1, Q
2Be respectively first and second switching tubes; D
1, D
2Be respectively first and second diodes; L
C1, L
C2Be respectively first and second coupling inductances; L is a filter inductance; v
GS1, v
GS2Be respectively the drive signal of first, second switching tube; i
LBe the electric current of inductance L, with the direction from the high-pressure side to the low-pressure side for just; v
DS1, v
DS2Be respectively the drain-source voltage of first, second switching tube; v
D1, v
D2Be respectively the voltage between first, second diode cathode and the anode; t
0, t
1, t
2Express time.
Embodiment
Fig. 1 and Fig. 2 are the circuit diagram of two kinds of converters mentioning in the background technology, and related content is referring to the background technology part.
The present invention boosts-and the circuit structure of buck two-way DC converter is as shown in Figure 3.Comprise the first and second power supply V
1, V
2, the first and second filter capacitor C
1, C
2, the first and second diode D
1, D
2, the first and second switching tube Q
1, Q
2, the first and second coupling inductance L
C1, L
C2And filter inductance L, wherein: the first power supply V
1Positive output end connect the first filter capacitor C
1An end, second source V
2Positive output end connect the second filter capacitor C
2An end, the first power supply V
1Negative output terminal connect the first filter capacitor C respectively
1The other end, the second filter capacitor C
2The other end and second source V
2Negative output terminal, the first switching tube Q
1The drain electrode and the second diode D
2Negative electrode all connect the first power supply V
1Positive output end, the first switching tube Q
1Source electrode connect the first diode D respectively
1The negative electrode and the first coupling inductance L
C1Non-same polarity, the first coupling inductance L
C1End of the same name connect an end and the second coupling inductance L of filter inductance L respectively
C2Non-same polarity, the second coupling inductance L
C2End of the same name connect second switch pipe Q respectively
2The drain electrode and the second diode D
2Anode, filter inductance L connects second source V
2Positive output end, the first diode D
1Anode connect second switch pipe Q respectively
2The source electrode and the first and second power supply V
1, V
2Negative output terminal.
The circuit structure of step-down/up type two-way DC converter of the present invention is as shown in Figure 4.Comprise the first and second power supply V
1, V
2, the first and second filter capacitor C
1, C
2, the first and second diode D
1, D
2, the first and second switching tube Q
1, Q
2, the first and second coupling inductance L
C1, L
C2And filter inductance L, wherein: the first power supply V
1Positive output end connect the first filter capacitor C
1An end, second source V
2Negative output terminal connect the second filter capacitor C
2An end, the first power supply V
1Negative output terminal connect the first filter capacitor C respectively
1The other end, the second filter capacitor C
2The other end and second source V
2Positive output end, the first switching tube Q
1The drain electrode and the second diode D
2Negative electrode all connect the first power supply V
1Positive output end, the first switching tube Q
1Source electrode connect the first diode D respectively
1The negative electrode and the first coupling inductance L
C1Non-same polarity, the first diode D
1Anode connect second switch pipe Q respectively
2Source electrode and second source V
2Negative output terminal, second switch pipe Q
2Drain electrode connect the second coupling inductance L respectively
C2The end of the same name and the second diode D
2Anode, the second coupling inductance L
C2Non-same polarity connect the first coupling inductance L respectively
C1End of the same name and the end of filter inductance L, the other end of filter inductance L connects the first power supply V respectively
1Negative output terminal and second source V
2Positive output end.
In the specific implementation, switching tube can select for use MOSFET or IGBT etc. to have the switching device of parasitic body diode, also can select the inverse-impedance type switching device with parasitic body diode for use.Coupling inductance L
C1And L
C2Intercouple together through a shared magnetic core, the volume of this magnetic core can be very little with respect to the volume of filter inductance L, coupling inductance L
C1And L
C2Inductance value also can be very little with respect to the inductance value of filter inductance L; Coupling inductance also can be used as the part of converter filter inductance simultaneously; Therefore the inductance value of filter inductance L can reduce relatively; Corresponding inductance core also can reduce to some extent, so the introducing of coupling inductance can not cause the obvious increase of converter volume weight.
Below with the present invention boost-the buck two-way DC converter is an example, and combines accompanying drawing 5～Figure 10 that the operation principle of two-way DC converter of the present invention is described.
Before analyzing, do following hypothesis: (1) switching tube, diode, inductance, electric capacity all are desirable device; (2) coupling inductance L
C1=L
C2=L
c, and filter inductance L=(n-1) L
c, n gets the real number greater than 1; (3) converter has been operated in stable state.(1) operational modal analysis during decompression mode (from the high side to low side transmission of power):
Mode 1: as shown in Figure 6, t
0Constantly, switching tube Q
1Conducting removes Q
1Outward, other switching tube and diode all turn-off, and are added in inductance L and coupling inductance L
C1Between voltage be V
1-V
2, inductive current is linear to increase diode D
2The voltage at two ends does
Switching tube Q
2Voltage does
Mode 2: as shown in Figure 7, t
1Constantly, switching tube Q
1Turn-off, inductance L is through diode D
1Afterflow, the inductive current linearity reduces, at this moment, switching tube Q
2The voltage at two ends does
Diode D
2The voltage at two ends does
Up to t
2Constantly, switching tube Q
1Conducting.
The groundwork waveform of converter is as shown in Figure 5 during decompression mode.
(2) operational modal analysis during boost mode (from low-pressure side to the high-pressure side transmission of power):
Mode 1: as shown in Figure 9, t
0Constantly, switching tube Q
2Conducting removes Q
2Outward, other switching tube and diode all turn-off, and are added in inductance L and coupling inductance L
C1Between voltage be-V
2, the inductive current negative sense is linear to increase diode D
1The voltage at two ends does
Switching tube Q
1Voltage does
Mode 2: shown in figure 10, t
1Constantly, switching tube Q
2Turn-off, inductance L is through diode D
2Afterflow, inductive current absolute value linearity reduces, at this moment, switching tube Q
1The voltage at two ends does
Diode D
1The voltage at two ends does
Up to t
2Constantly, switching tube Q
2Conducting.
The groundwork waveform of converter is as shown in Figure 8 during boost mode.
Claims (3)
1. a two-way DC converter comprises the first and second power supply (V
1, V
2), the first and second filter capacitor (C
1, C
2), the first power supply (V
1) positive output end connect the first filter capacitor (C
1) an end, second source (V
2) positive output end connect the second filter capacitor (C
2) an end, the first power supply (V
1) negative output terminal connect the first filter capacitor (C respectively
1) the other end, the second filter capacitor (C
2) the other end and second source (V
2) negative output terminal, it is characterized in that: also comprise the first and second diode (D
1, D
2), the first and second switching tube (Q
1, Q
2), the first and second coupling inductance (L
C1, L
C2) and filter inductance (L), the first switching tube (Q
1) the drain electrode and the second diode (D
2) negative electrode all connect the first power supply (V
1) positive output end, the first switching tube (Q
1) source electrode connect the first diode (D respectively
1) the negative electrode and the first coupling inductance (L
C1) non-same polarity, the first coupling inductance (L
C1) end of the same name connect an end and the second coupling inductance (L of filter inductance (L) respectively
C2) non-same polarity, the second coupling inductance (L
C2) end of the same name connect second switch pipe (Q respectively
2) the drain electrode and the second diode (D
2) anode, filter inductance (L) connects second source (V
2) positive output end, the first diode (D
1) anode connect second switch pipe (Q respectively
2) the source electrode and the first and second power supply (V
1, V
2) negative output terminal.
2. a two-way DC converter comprises the first and second power supply (V
1, V
2), the first and second filter capacitor (C
1, C
2), the first power supply (V
1) positive output end connect the first filter capacitor (C
1) an end, second source (V
2) negative output terminal connect the second filter capacitor (C
2) an end, the first power supply (V
1) negative output terminal connect the first filter capacitor (C respectively
1) the other end, the second filter capacitor (C
2) the other end and second source (V
2) positive output end, it is characterized in that: also comprise the first and second diode (D
1, D
2), the first and second switching tube (Q
1, Q
2), the first and second coupling inductance (L
C1, L
C2) and filter inductance (L), the first switching tube (Q
1) the drain electrode and the second diode (D
2) negative electrode all connect the first power supply (V
1) positive output end, the first switching tube (Q
1) source electrode connect the first diode (D respectively
1) the negative electrode and the first coupling inductance (L
C1) non-same polarity, the first diode (D
1) anode connect second switch pipe (Q respectively
2) source electrode and second source (V
2) negative output terminal, second switch pipe (Q
2) drain electrode connect the second coupling inductance (L respectively
C2) the end of the same name and the second diode (D
2) anode, the second coupling inductance (L
C2) non-same polarity connect the first coupling inductance (L respectively
C1) end of the same name and an end of filter inductance (L), the other end of filter inductance (L) connects the first power supply (V respectively
1) negative output terminal and second source (V
2) positive output end.
3. two-way DC converter according to claim 1 and 2 is characterized in that: the said first and second coupling inductance (L
C1, L
C2) intercouple together through a shared inductance core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101025489A CN101741259B (en) | 2010-01-28 | 2010-01-28 | Two-way DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101025489A CN101741259B (en) | 2010-01-28 | 2010-01-28 | Two-way DC converter |
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| Publication Number | Publication Date |
|---|---|
| CN101741259A CN101741259A (en) | 2010-06-16 |
| CN101741259B true CN101741259B (en) | 2012-02-22 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011147266A2 (en) * | 2011-05-16 | 2011-12-01 | 华为技术有限公司 | Subsidiary power source for bidirectional power supply |
| CN103107691A (en) * | 2011-11-14 | 2013-05-15 | 上海英孚特电子技术有限公司 | Simple method for eliminating turn-off loss of diode in metal oxide semiconductor (MOS) switch tube |
| CN103516201A (en) * | 2013-04-15 | 2014-01-15 | 南京航空航天大学 | Low-ripple H-bridge buck-boost direct current converter |
| CN104467415B (en) * | 2014-11-25 | 2017-07-18 | 成都芯源系统有限公司 | Multi-mode switching circuit and control method thereof |
| JP2017221073A (en) * | 2016-06-10 | 2017-12-14 | Ntn株式会社 | Dc/dc converter |
| TWI625922B (en) * | 2017-04-12 | 2018-06-01 | 國立中山大學 | Wide-range voltage conversion ratios dc-dc converter |
| US20200119646A1 (en) * | 2017-06-27 | 2020-04-16 | Huawei Technologies Co., Ltd. | Buck/Boost Chip Control Method, Buck/Boost Chip, and Electronic Device |
| CN109088542A (en) * | 2018-11-05 | 2018-12-25 | 江苏工程职业技术学院 | A kind of combined bidirectional DC transfer circuit |
| CN110011540B (en) * | 2019-04-13 | 2021-04-13 | 西华大学 | Single-inductor two-stage type double-input Tri-BOOST converter and control method |
| CN110739901A (en) * | 2019-10-08 | 2020-01-31 | 郑州大学 | high-reliability brushless direct current motor driving and position-free control system |
| CN112436500B (en) * | 2020-11-13 | 2021-07-20 | 成都通用整流电器研究所 | Direct current microgrid power generation, transmission and distribution system |
| CN112838757B (en) * | 2020-12-30 | 2022-07-15 | 西华大学 | Power factor correction converter of time-division multiplexing transformer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1583459A (en) * | 2004-06-15 | 2005-02-23 | 嘉兴市恒久动力科技有限公司 | Gas and electric mixed power system of light traffic tool |
| CN1734904A (en) * | 2005-08-08 | 2006-02-15 | 南京航空航天大学 | Single switch double output booster converter |
-
2010
- 2010-01-28 CN CN2010101025489A patent/CN101741259B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1583459A (en) * | 2004-06-15 | 2005-02-23 | 嘉兴市恒久动力科技有限公司 | Gas and electric mixed power system of light traffic tool |
| CN1734904A (en) * | 2005-08-08 | 2006-02-15 | 南京航空航天大学 | Single switch double output booster converter |
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