CN2580673Y - Three electric level, passive and soft switching type DC transducer circuit - Google Patents
Three electric level, passive and soft switching type DC transducer circuit Download PDFInfo
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- CN2580673Y CN2580673Y CN 02266116 CN02266116U CN2580673Y CN 2580673 Y CN2580673 Y CN 2580673Y CN 02266116 CN02266116 CN 02266116 CN 02266116 U CN02266116 U CN 02266116U CN 2580673 Y CN2580673 Y CN 2580673Y
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Abstract
The utility model relates to a three-level passive and soft switching type DC transducer circuit, which is provided with two full symmetrical units. Each unit comprises a power switch tube, a flywheel diode and a buck or a boost or a buck-boost or a CUK circuit which has an inductor which is shared by a capacitor and a unit which have partial pressure function. An inductor is connected into a contact point of the power switch tube and the flywheel diode of each unit. The power switch tube is connected with a series circuit in parallel, and the series circuit is composed of a first capacitor a first diode. The direction of the first diode and the direction of the power switch are consistent, and the contact of the first diode and the power switch is connected with one end of the inductor. Both ends of the flywheel diode are connected with a series circuit in parallel, and the series circuit is composed of a second capacitor and a second diode. The direction of the second diode and the direction of the flywheel diode are consistent, and the contact of the second capacitor and the flywheel diode is connected with the other end of the inductor. A third diode is connected between the contact of the first capacitor and the first diode and the contact of the second capacitor and the second diode, and the polarities of the three diodes are consistent. The utility model has the advantages of less added component, simple structure and no energy consumption element in the circuit.
Description
Technical field
The present invention relates to DC-DC converter.Relate to three-level passive flexible switch DC converter circuit specifically.
Background technology
Conventional buck, boost, buck-boost and four kinds of three-level DC-DC converters of CUK, have two element circuits of symmetry fully respectively, each element circuit comprises power switch tube S, sustained diode, dividing potential drop effect capacitor C and units shared inductance L are generally hard switching work.In recent years, studied some soft switch circuits in succession, mainly contained two kinds: a kind of is additional active and passive component in converter, realize the soft switch of power device, owing to adopt number of elements many, and need extra detection, so control is complicated, cost height, poor reliability; Another kind is the additional passive buffer circuit that contains resistance, and its energy loss is big, and energy consumption causes the circuit working decrease in efficiency during work on resistance.
Summary of the invention
It is few to the purpose of this invention is to provide add ons quantity, simple in structure, and cost is low, need not extra detection and control, and the three-level passive flexible switch DC-DC converter circuit of noenergy loss.
Technical solution of the present invention is, for having two complete symmetrical cell, and each element circuit includes power switch tube S, sustained diode, the buck of dividing potential drop effect capacitor C and units shared inductance L or boost or buck-boost or cuk converter, insert inductance at the power switch pipe of each unit and the contact place of fly-wheel diode, the series circuit that the power switch pipe parallel connection is made of first electric capacity and first diode, its first diode is consistent with the power switch pipe direction, and both contacts link to each other with inductance one end, the series circuit that constitutes by second electric capacity and second diode in the parallel connection of the two ends of fly-wheel diode, its second diode is consistent with the fly-wheel diode direction, second electric capacity links to each other with the other end of inductance with the contact of fly-wheel diode, between the contact that connects Dian and second electric capacity and second diode of first electric capacity and first diode, insert the 3rd diode, first, second, the polarity of the 3rd these three diodes is consistent.
During work, the resonance between inductance and two electric capacity has realized that the zero current turning-on of switching tube and no-voltage turn-off, and the no-voltage of fly-wheel diode is turn-offed and no-voltage is open-minded.Simultaneously, each switch periods electric capacity is collected these resonant energies, and it transfers to load the most at last, has realized absorbing the harmless operation of circuit.
Three-level passive flexible switch DC-DC converter circuit add ons of the present invention is few, simple in structure, cost is low, need not extra detection and control, noenergy losser in the circuit can improve the efficient of three-level DC-DC converter, and in the commutation course, no-voltage overshoot when power switch pipe turn-offs, no current overshoot when fly-wheel diode is opened.The shunt circuit of power switch pipe and fly-wheel diode is minimum ring in addition, promptly only is made of a diode and an electric capacity, can make the voltage stress when turn-offing be minimum.
Description of drawings
Fig. 1 is the application example of the present invention in the BUCK DC-DC converter;
Fig. 2 is the application example of the present invention in the BOOST DC-DC converter;
Fig. 3 is the application example of the present invention in the BUCK-BOOST DC-DC converter;
Fig. 4 is the application example of the present invention in the CUK DC-DC converter.
Embodiment
Referring to Fig. 1, three-level passive flexible switch DC-DC converter circuit, have two buck element circuits of symmetry fully, each unit comprises power switch tube S, sustained diode, dividing potential drop effect capacitor C and units shared inductance L, L places output, it is characterized in that inserting inductance L s in the power switch tube S of each unit and the contact place of sustained diode, the series circuit that the power switch tube S parallel connection is made of the first capacitor C s and the first diode Ds, Ds is consistent with the power switch tube S direction for its first diode, and both contacts link to each other with inductance L s one end, the series circuit that constitutes by the second capacitor C o and the second diode Dc in the parallel connection of the two ends of sustained diode, Dc is consistent with the sustained diode direction for its second diode, the second capacitor C o links to each other with the other end of inductance L s with the contact of sustained diode, between the contact that meets Dian and the second capacitor C o and the second diode Dc of the first capacitor C s and the first diode Ds, insert the 3rd diode Do, first, second, the 3rd these three diode Ds, Dc, the polarity of Do is consistent.
Referring to Fig. 2, three-level passive flexible switch DC-DC converter circuit, have two boost element circuits of symmetry fully, each unit comprises power switch tube S, sustained diode, dividing potential drop effect capacitor C and units shared inductance L, L places output, it is characterized in that inserting inductance L s in the power switch tube S of each unit and the contact place of sustained diode, the series circuit that the power switch tube S parallel connection is made of the first capacitor C s and the first diode Ds, Ds is consistent with the power switch tube S direction for its first diode, and both contacts link to each other with inductance L s one end, the series circuit that constitutes by the second capacitor C o and the second diode Dc in the parallel connection of the two ends of sustained diode, Dc is consistent with the sustained diode direction for its second diode, the second capacitor C o links to each other with the other end of inductance L s with the contact of sustained diode, between the contact that meets Dian and the second capacitor C o and the second diode Dc of the first capacitor C s and the first diode Ds, insert the 3rd diode Do, first, second, the 3rd these three diode Ds, Dc, the polarity of Do is consistent.
Referring to Fig. 3, three-level passive flexible switch DC-DC converter circuit, have two buck-boost element circuits of symmetry fully, each unit comprises power switch tube S, sustained diode, dividing potential drop effect capacitor C and units shared inductance L, L places between the two unit sustained diode, it is characterized in that inserting inductance L s in the power switch tube S of each unit and the contact place of sustained diode, the series circuit that the power switch tube S parallel connection is made of the first capacitor C s and the first diode Ds, Ds is consistent with the power switch tube S direction for its first diode, and both contacts link to each other with inductance L s one end, the series circuit that constitutes by the second capacitor C o and the second diode Dc in the parallel connection of the two ends of sustained diode, Dc is consistent with the sustained diode direction for its second diode, the second capacitor C o links to each other with the other end of inductance L s with the contact of sustained diode, between the contact that meets Dian and the second capacitor C o and the second diode Dc of the first capacitor C s and the first diode Ds, insert the 3rd diode Do, first, second, the 3rd these three diode Ds, Dc, the polarity of Do is consistent.
Referring to Fig. 4, three-level passive flexible switch DC-DC converter circuit, have two CUK element circuits of symmetry fully, each unit comprises power switch tube S, sustained diode, the inductance L of dividing potential drop effect capacitor C and two units shareds, L places input and output side respectively, it is characterized in that inserting inductance L s in the power switch tube S of each unit and the contact place of sustained diode, the series circuit that the power switch tube S parallel connection is made of the first capacitor C s and the first diode Ds, Ds is consistent with the power switch tube S direction for its first diode, and both contacts link to each other with inductance L s one end, the series circuit that constitutes by the second capacitor C o and the second diode Dc in the parallel connection of the two ends of sustained diode, Dc is consistent with the sustained diode direction for its second diode, the second capacitor C o links to each other with the other end of inductance L s with the contact of sustained diode, between the contact that meets Dian and the second capacitor C o and the second diode Dc of the first capacitor C s and the first diode Ds, insert the 3rd diode Do, first, second, the 3rd these three diode Ds, Dc, the polarity of Do is consistent.
The working condition of three-level passive flexible switch DC-DC converter circuit is an example with Fig. 2 circuit, and it exists two kinds of change of current situations, the i.e. change of current between the power switch pipe of each unit and the fly-wheel diode.Because the symmetry of circuit structure, only the commutation course with a unit is that example is analyzed as follows:
Power switch tube S is open-minded, the commutation course that sustained diode is turn-offed:
Before the change of current, circuit is in the steady-working state of power switch tube S shutoff, sustained diode afterflow.When power switch tube S is opened, because the existence of resonant inductance Ls, the electric current of power switch tube S is started from scratch and is risen so that certain slope is linear, be that power switch tube S has realized zero current turning-on, the current value of sustained diode begins to reduce with identical slope linearity from input current simultaneously, turn-offs until sustained diode.At this moment, the second capacitor C o terminal voltage is zero.The first capacitor C s, the 3rd diode Do, the second capacitor C o, inductance L s begin resonance, and the sustained diode terminal voltage rises from zero resonance, realize that the no-voltage of sustained diode is turn-offed.The first capacitor C s is discharged to zero, the conducting of first diode Ds nature, V
CsBe held constant at zero, inductance L s, the first diode Ds, the 3rd diode Do, the second capacitor C o begin second resonant process, and when the electric current of capacitor C o was reduced to zero, second resonant process finished, and the first diode Ds, the 3rd diode Do turn-off naturally.Afterwards, the voltage on the second capacitor C o and the first capacitor C s all remains unchanged, the steady operational status of circuit ingoing power switching tube S conducting.
Power switch tube S is turn-offed, the commutation course that sustained diode is opened:
Power switch tube S is closed and is had no progeny, and input current charges to the first capacitor C s through the first diode Ds, and the tube voltage of power switch tube S has realized promptly that from liter above freezing the no-voltage of power switch tube S is turn-offed.When the first capacitor C s charges to and equates with last output capacitance terminal voltage, the conducting of the 3rd diode Do, second diode Dc nature, V
CsKeep constant, to the output resonant discharge, current value reduces from input current inductance L s electric current gradually through the first diode Ds, the 3rd diode Do, the second diode Dc, and the second capacitor C o discharges V through the second diode Dc simultaneously
CoReduce.When the second capacitor C o terminal voltage was reduced to zero, the conducting of sustained diode nature had realized that the no-voltage of sustained diode is open-minded.Afterwards, the electric current of Ls continues to reduce through the first diode Ds, the 3rd diode Do, second diode Dc discharge, up to vanishing, the first diode Ds, the 3rd diode Do, the second diode Dc turn-off, commutation course finishes, and circuit is in the stable state of load current by sustained diode output.
Claims (1)
1. three-level passive flexible switch DC converter circuit, have two the symmetrical fully buck unit or the circuit of boost unit or buck-boost unit or CUK unit, each unit comprises power switch pipe (S), fly-wheel diode (D), dividing potential drop effect electric capacity (C) and units shared inductance (L), the contact place that it is characterized in that power switch pipe (S) in each unit and fly-wheel diode (D) inserts inductance (Ls), power switch pipe (S) series circuit that constitutes by first electric capacity (Cs) and first diode (Ds) in parallel, its first diode (Ds) is consistent with power switch pipe (S) direction, and both contacts link to each other with inductance (Ls) end, the series circuit that constitutes by second electric capacity (Co) and second diode (Dc) in the two ends parallel connection of fly-wheel diode (D), its second diode (Dc) is consistent with fly-wheel diode (D) direction, second electric capacity (Co) links to each other with the other end of inductance (Ls) with the contact of fly-wheel diode (D), between the contact that connects Dian and second electric capacity (Co) and second diode (Dc) of first electric capacity (Cs) and first diode (Ds), insert the 3rd diode (Do), first, second, the three or three diode (Ds, Dc, Do) polarity is consistent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02266116 CN2580673Y (en) | 2002-08-05 | 2002-08-05 | Three electric level, passive and soft switching type DC transducer circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02266116 CN2580673Y (en) | 2002-08-05 | 2002-08-05 | Three electric level, passive and soft switching type DC transducer circuit |
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| CN2580673Y true CN2580673Y (en) | 2003-10-15 |
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|---|---|---|---|
| CN 02266116 Expired - Fee Related CN2580673Y (en) | 2002-08-05 | 2002-08-05 | Three electric level, passive and soft switching type DC transducer circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101640498B (en) * | 2009-09-08 | 2011-09-21 | 西安交通大学 | Tri-level zero-current conversion soft switching inverter of active middle voltage clamp |
| CN103944440A (en) * | 2014-04-22 | 2014-07-23 | 吉林大学 | Electrical source emission device and control method with soft chopping wave characteristic |
| CN107863876A (en) * | 2017-11-14 | 2018-03-30 | 大连泰思曼科技有限公司 | Constant current turns constant pressure converter and constant current turns constant-voltage equipment |
| CN112688557A (en) * | 2020-12-07 | 2021-04-20 | 珠海格力电器股份有限公司 | Buffer circuit, Buck circuit, switch converter and air conditioner |
| EP4016828A4 (en) * | 2019-08-15 | 2022-09-28 | Huawei Digital Power Technologies Co., Ltd. | Dc-dc converter circuit |
-
2002
- 2002-08-05 CN CN 02266116 patent/CN2580673Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101640498B (en) * | 2009-09-08 | 2011-09-21 | 西安交通大学 | Tri-level zero-current conversion soft switching inverter of active middle voltage clamp |
| CN103944440A (en) * | 2014-04-22 | 2014-07-23 | 吉林大学 | Electrical source emission device and control method with soft chopping wave characteristic |
| CN103944440B (en) * | 2014-04-22 | 2016-05-25 | 吉林大学 | One has soft copped wave characteristic grounded source emitter and control method |
| CN107863876A (en) * | 2017-11-14 | 2018-03-30 | 大连泰思曼科技有限公司 | Constant current turns constant pressure converter and constant current turns constant-voltage equipment |
| CN107863876B (en) * | 2017-11-14 | 2020-07-07 | 大连泰思曼科技有限公司 | Converter for converting constant current into constant voltage and device for converting constant current into constant voltage |
| EP4016828A4 (en) * | 2019-08-15 | 2022-09-28 | Huawei Digital Power Technologies Co., Ltd. | Dc-dc converter circuit |
| US11894762B2 (en) | 2019-08-15 | 2024-02-06 | Huawei Digital Power Technologies Co., Ltd. | Direct current-direct current conversion circuit |
| CN112688557A (en) * | 2020-12-07 | 2021-04-20 | 珠海格力电器股份有限公司 | Buffer circuit, Buck circuit, switch converter and air conditioner |
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| C14 | Grant of patent or utility model | ||
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |