CN216774617U

CN216774617U - High-gain Buck-Boost direct current converter

Info

Publication number: CN216774617U
Application number: CN202122994204.XU
Authority: CN
Inventors: 陈景文; 郑乃文
Original assignee: Shaanxi University of Science and Technology
Current assignee: Shaanxi University of Science and Technology
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-06-17
Anticipated expiration: 2031-11-30

Abstract

The utility model belongs to the technical field of bidirectional direct-current power supplies, and discloses a high-gain Buck-Boost direct-current converter which comprises a first switch tube, a second switch tube, a first diode, a second diode, a third diode, a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth inductor, a sixth inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor and a first direct-current source; the third inductor and the fourth inductor are coupled inductors, the fifth inductor is a magnetizing inductor of the third inductor, and the sixth inductor is a leakage inductor of the third inductor. Realize high gain step-up and step-down function through neotype inductive coupling structure, this converter has low electric current ripple, simple control mode, and input and output port have positive output voltage, power device low voltage stress altogether. And the control of a switching tube in the boost conversion circuit is realized through the DSP chip and the PWM controller, the technology is mature, the realization is convenient, the structure is simple, and the cost is reduced.

Description

High-gain Buck-Boost direct current converter

Technical Field

The utility model belongs to the technical field of bidirectional direct-current power supplies, and relates to a high-gain Buck-Boost direct-current converter.

Background

The development of renewable energy, electric vehicles and uninterruptible power supplies has been one of the most attractive topics in the power electronics field over the past decades, with DC-DC bi-directional converters being a key component for its applications. However, since the dc voltage level on the renewable energy source side, the electric vehicle side, and the uninterruptible power supply side is low, it is necessary to realize this by a bidirectional converter that steps up and down.

The existing buck-boost bidirectional converter has the following defects: 1. the voltage gain is low; 2. the use of a coupled inductor can improve gain, but can increase current ripple; 3. the high-voltage gain structure has the condition that input and output are not in common or negative voltage is output; 4. the voltage stress of the power device is large. Therefore, in recent years, researchers at home and abroad have been working on new structures capable of realizing high voltage gain and high efficiency and better operation characteristics.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects that the existing Boost converter is low in voltage gain, a coupling inductor structure increases current ripples, a high-voltage gain structure has the defects of input and output non-common ground or output negative voltage and large voltage stress of a power device, and provides a high-gain Buck-Boost direct current converter.

The utility model is realized by the following technical scheme:

a high-gain Buck-Boost direct current converter is characterized by comprising a first switch tube, a second switch tube, a first diode, a second diode, a third diode, a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth inductor, a sixth inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor and a first direct current source;

the third inductor and the fourth inductor are coupled inductors, the fifth inductor is a magnetizing inductor of the third inductor, and the sixth inductor is a leakage inductor of the third inductor;

the positive electrode of the first direct current source is respectively connected with one end of the first inductor and one end of the second inductor,

the other end of the first inductor is respectively connected with the drain electrode of the first switch tube and the anode of the first capacitor,

the other end of the second inductor is respectively connected with the drain electrode of the second switch tube and the anode of the second capacitor,

the negative electrode of the first capacitor is respectively connected with the source electrode of the second switch tube and the positive electrode of the first diode,

the negative electrode of the second capacitor is respectively connected with the positive electrode of the second diode, one end of the third inductor and one end of the fifth inductor, the other end of the third inductor is respectively connected with one end of the fifth inductor and one end of the sixth inductor,

the cathode of the second diode is respectively connected with one end of a fourth inductor, the cathode of a fourth capacitor and the anode of a third capacitor, the other end of the fourth inductor is connected with the anode of a third diode, the cathode of the third diode is respectively connected with the anode of the fourth capacitor and one end of a first resistor,

and the first direct current source cathode, the first switch tube source electrode, the first diode cathode, the other end of the sixth inductor and the third capacitor cathode are sequentially connected and connected to the other end of the first resistor.

Further, the first direct current source voltage value is 25V.

Further, the first switch tube and the second switch tube are both N-channel power MOSFET switch tubes with the model number of IRFB 4227.

Further, the first diode adopts a fast recovery diode of MUR410, the second diode adopts a fast recovery diode of MUR420, and the third diode adopts a fast recovery diode of MUR 440.

Furthermore, the magnetic core of the first inductor adopts an inductor with the inductance value of 600uH in the type of T184-52, and the magnetic core of the second inductor adopts an inductor with the inductance value of 900uH in the type of T184-5.

Furthermore, the magnetic cores of the third inductor, the fourth inductor, the fifth inductor and the sixth inductor are all inductors of EE42, and the inductance values are 23uH, 37uH, 200uH and 1uH respectively.

Furthermore, the first capacitor, the second capacitor, the third capacitor and the fourth capacitor are all 100uF capacitors with withstand voltage value of 160V.

Further, the device also comprises a voltage sensor, a DSP chip and a PWM controller;

the voltage sensor measuring end is connected to two ends of the first resistor, the output end is sequentially connected with the DSP chip and the PWM controller, and the PWM controller is provided with two output ends which are respectively connected with the grid electrode of the first switch tube and the grid electrode of the second switch tube.

Compared with the prior art, the utility model has the following beneficial technical effects:

the utility model provides a high-gain Buck-Boost direct current converter which comprises a first switch tube, a second switch tube, a first diode, a second diode, a third diode, a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth inductor, a sixth inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor and a first direct current source, wherein the first switch tube is connected with the first switch tube; the third inductor and the fourth inductor are coupled inductors, the fifth inductor is a magnetizing inductor of the third inductor, and the sixth inductor is a leakage inductor of the third inductor. Realize high gain step-up and step-down function through neotype inductive coupling structure, this converter has low electric current ripple, simple control mode, and input and output port have positive output voltage, power device low voltage stress altogether. And the control of a switching tube in the boost conversion circuit is realized through the DSP chip and the PWM controller, the technology is mature, the realization is convenient, the structure is simple, and the cost is reduced.

Drawings

FIG. 1 is a circuit topology diagram of an embodiment of the present invention;

FIG. 2 is a schematic diagram illustrating a first operating state according to an embodiment of the present invention;

FIG. 3 is a diagram illustrating a second operating state according to the embodiment of the present invention;

fig. 4 is a schematic diagram of a third operating state according to the embodiment of the present invention.

Detailed Description

The present invention will now be described in further detail with reference to the attached drawings, which are illustrative, but not limiting, of the present invention.

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the utility model described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, article, or apparatus.

The utility model provides a high-gain Buck-Boost direct current converter, which comprises a first switching tube S as shown in figure 1₁A second switch tube S₂A first diode D₁A second diode D₂A third diode D₃A first inductor L₁A second inductor L₂A third inductor L₃A fourth inductor L₄A fifth inductor L₅A sixth inductor L₆A first capacitor C₁A second capacitor C₂A third capacitor C₃A fourth capacitor C₄A first resistor R₁And a first DC source V_in；

The third inductor L₃And a fourth inductance L₄Mutually coupled inductors, a fifth inductor L₅Is a third inductance L₃The magnetizing inductance of (1), the sixth inductance L₆Is a third inductance L₃The leakage inductance of (a);

the first DC source V_inPositive electrode, first inductance L₁One terminal and a second inductor L₂One end is connected; the first inductor L₁The other end of the first switch tube S₁Drain electrode and first capacitor C₁The positive electrodes are connected; the second inductor L₂The other end of the first switch tube S₂Drain electrode and second capacitor C₂Positive electrode connected to a first capacitor C₁Negative pole, second switch tube S₂Source and first diode D₁Positive electrode connected to a second capacitor C₂Cathode, second diode D₂Positive electrode, third inductance L₃One terminal and a fifth inductor L₅One end of the third inductor L is connected₃The other end of the inductor L₅The other end and a sixth inductor L₆One end connected to a second diode D₂Negative pole, fourth inductance L₄One terminal, a fourth capacitor C₄Negative pole and third capacitor C₃Positive pole connected, fourth inductance L₄The other end and a third diode D₃Anode connected, a third diode D₃Negative electrode, fourth capacitor C₄Positive electrode and first resistor R₁One end is connected with a first direct current source V_inNegative electrode, first switch tube S₁Source electrode, first diode D₁Negative pole, sixth inductance L₆The other end and a third capacitor C₃Negative electrode and first resistor R₁The other ends are connected.

In a preferred embodiment of the present invention, the first DC source V_inThe voltage value is 25V;

first switch tube S₁And a second switching tube S₂N-channel power MOSFET switching tubes with the model number of IRFB4227 are adopted;

first diode D₁A fast recovery diode with the model MUR410 and a second diode D are adopted₂A fast recovery diode with the model of MUR420 and a third diode D are adopted₃A fast recovery diode of the type MUR440 is used.

In another preferred embodiment of the present invention, the first inductor L₁The model of the magnetic core adopts T184-52, and the inductance value is 600 uH;

the second inductor L₂The magnetic core model adopts T184-5, the inductance value is 900uH,

the third inductor L₃A fourth inductor L₄A fifth inductor L₅And a sixth inductance L₆The types of the magnetic cores are all EE42, and the inductance values are 23uH, 37uH, 200uH and 1uH respectively;

in another preferred embodiment of the present invention, the first capacitor C₁A second capacitor C₂A third capacitor C₃And a fourth capacitance C₄The pressure resistance value was 160V and the capacity was 100 uF.

Another preferred embodiment of the utility model is that the utility model further comprises a voltage sensor, a DSP chip and a PWM controller;

the measuring end of the voltage sensor is connected with a first resistor R₁Two ends, the output end is connected with the DSP chip and the PWM controller in sequence, the PWM controller is provided with two output ends which are respectively connected with the first switch tube S₁Grid and second switch tube S₂A gate electrode of (1).

The principle and the working process of the utility model are as follows:

the high-gain Buck-Boost direct current converter provided by the utility model has the following three working modes.

The first mode of operation: as shown in fig. 2, the first switch tube S₁And a second switching tube S₂Are all turned on, the first diode D₁A second diode D₂A third diode D₃All are reversely biased to be truncated. A first DC source V_inFor the first inductance L₁Charging is carried out, the first direct current source V_inAnd a first capacitor C₁Are jointly a second inductance L₂Charging is carried out, the first capacitor C₁And a second capacitor C₂At the same time to the fifth inductance L₅Charging, third capacitor C₃And a fourth capacitance C₄At the same time being the first resistance R₁Supplying power to maintain the first resistor R₁The voltage at the two ends is stable.

The second working mode is as follows: as shown in fig. 3, the first switch tube S₁And a second switching tube S₂Are all turned off, the first twoPolar tube D₁A second diode D₂A third diode D₃Are all conducted in the forward direction. A first DC source V_inAnd a first inductance L₁Simultaneously to the first capacitor C₁Charging is carried out by a first DC source V_inAnd a second inductance L₂While for the second capacitor C₂And a third capacitance C₃Charging is carried out, and the fifth inductor L₅Passing energy through its coupled inductance primary side L₃To the secondary side L₄Is a fourth capacitor C₄And a first resistor R₁Supplying power to maintain the first resistor R₁The voltage at the two ends is stable.

A third operating mode: as shown in fig. 4, the first switch tube S₁And a second switching tube S₂Are all turned off, the first diode D₁A third diode D₃Forward conduction, second diode D₂Reverse bias is cut off.

In this mode, the first DC source V_inAnd a first inductance L₁Simultaneously to the first capacitor C₁Charging is carried out, the first direct current source V_inAnd a second inductance L₂While for the second capacitor C₂Charging is carried out, and the fifth inductor L₅Passing energy through its coupled inductance primary side L₃To the secondary side L₄Is a fourth capacitor C₄And a first resistor R₁Supplying power to maintain the first resistor R₁The voltage at the two ends is stable.

The converter has low current ripple and simple control mode in use, the input and output ports are grounded and have positive output voltage, and the power device has low voltage stress. And the control of a switching tube in the boost conversion circuit is realized through the DSP chip and the PWM controller, the technology is mature, the realization is convenient, the structure is simple, and the cost is reduced.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-gain Buck-Boost direct current converter is characterized by comprising a first switch tube, a second switch tube, a first diode, a second diode, a third diode, a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth inductor, a sixth inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor and a first direct current source;

2. A high-gain Buck-Boost dc converter according to claim 1, wherein said first dc source voltage has a value of 25V.

3. The high-gain Buck-Boost direct-current converter according to claim 1, wherein said first and second switching tubes are N-channel power MOSFET switching tubes of type IRFB 4227.

4. The high-gain Buck-Boost direct-current converter according to claim 1, wherein said first diode is a fast recovery diode of MUR410, said second diode is a fast recovery diode of MUR420, and said third diode is a fast recovery diode of MUR 440.

5. The high-gain Buck-Boost direct-current converter according to claim 1, wherein a magnetic core of the first inductor is an inductor with an inductance value of 600uH, and a magnetic core of the second inductor is an inductor with an inductance value of 900uH, wherein the type of T184-52 is adopted.

6. The high-gain Buck-Boost direct-current converter according to claim 1, wherein the magnetic cores of the third inductor, the fourth inductor, the fifth inductor and the sixth inductor are all EE42 inductors, and the inductance values are 23uH, 37uH, 200uH and 1uH respectively.

7. The high-gain Buck-Boost direct-current converter according to claim 1, wherein the first capacitor, the second capacitor, the third capacitor and the fourth capacitor are all capacitors with a withstand voltage of 160V and a capacity of 100 uF.

8. The high-gain Buck-Boost direct-current converter according to claim 1, further comprising a voltage sensor, a DSP chip and a PWM controller;