CN107733213A - A kind of high-gain half-bridge impedance network converter - Google Patents

Abstract

The invention discloses a high-gain half-bridge impedance network converter, which includes a DC power supply, a diode, a first capacitor, a second capacitor, a third capacitor, a first switch tube, a second switch tube and a three-winding coupling inductor. Compared with the structure of some power electronic transformers, the structure of the high-gain half-bridge impedance network converter provided by this application determines that it will not have a through phenomenon and has high safety; in addition, this application can change the first switching tube and the second The duty cycle of the two switching tubes, the number of turns of the first inductor, the second inductor and the third inductor are used to adjust the output voltage of the transformer, and obtain an adjustable AC output for buck-boost or DC output with adjustable buck-boost. Wide range, simple control, high efficiency, low cost and small size.

Description

A High-Gain Half-Bridge Impedance Network Converter

technical field

The invention relates to the technical field of variable energy conversion, in particular to a high-gain half-bridge impedance network converter.

Background technique

Due to the low conversion efficiency and large volume of traditional transformers, power electronic transformers have developed rapidly in recent years. However, there are still many technical problems in existing power electronic transformers. Please refer to FIG. 1, which is a schematic structural diagram of a power electronic transformer in the prior art. Power electronic transformers in the prior art usually have the following disadvantages :

1) If the switching tubes on the same bridge arm of the power electronic transformer are turned on alternately due to false triggering, the switching tubes will be damaged or even the power supply will be burned, which will have a great impact on the circuit.

2) Existing power electronic transformers can usually only complete step-down inverters. When boosting is required, an additional step-up circuit must be added to the front stage, or a transformer should be added to the output end to increase the output voltage. Adding a first-stage boost circuit will lead to complex control of the overall circuit and low efficiency, and adding a transformer at the output end will increase the size and cost of the circuit.

3) The power electronic transformer in the prior art cannot realize both controllable AC output and DC output, and its application range is narrow.

Therefore, how to provide a solution to the above technical problems is a problem that those skilled in the art need to solve at present.

Contents of the invention

The purpose of the present invention is to provide a high-gain half-bridge impedance network converter. The structure of the high-gain half-bridge impedance network converter provided by the application determines that it will not have a straight-through phenomenon and has high security; in addition, the application can pass Change the duty cycle of the first switch tube and the second switch tube, the number of turns of the first inductor, the second inductor and the third inductor to adjust the output voltage of the transformer, and obtain an adjustable AC output or buck-boost Adjustable DC output, wide application range, simple control, high efficiency, low cost and small size.

In order to solve the above technical problems, the present invention provides a high-gain half-bridge impedance network converter, including a DC power supply, a diode, a first capacitor, a second capacitor, a third capacitor, a first switch tube, a second switch tube and three A winding coupled inductor, wherein: the anode of the DC power supply is respectively connected to the first end of the first capacitor and the anode of the diode, and the cathode of the diode is connected to the first end of the first inductor of the three-winding coupled inductor. The second end of the first inductance is respectively connected to the first end of the third inductance of the three-winding coupled inductance and the first end of the third capacitor, and the second end of the third inductance is connected to the first end of the third capacitor. The first end of the first switch tube is connected, the second end of the first switch tube is respectively connected to the first end of the second switch tube and the first end of the load, and the second end of the third capacitor The terminal is connected to the first terminal of the second inductance of the three-winding coupled inductance, and the second terminal of the second inductance is respectively connected to the second terminal of the second switching tube, the first terminal of the second capacitor and the first terminal of the second capacitor. The negative pole of the DC power supply is connected, and the second end of the first capacitor is respectively connected to the second end of the second capacitor and the second end of the load; wherein, the first end of the first inductor, The first end of the second inductance and the first end of the third inductance are terminals with the same name;

When the first switch tube is turned on and the second switch tube is turned on or when the first switch tube is turned off and the second switch tube is turned on:

When the first switch tube is turned on and the second switch tube is turned off:

Wherein, V _O is the output voltage of the converter, V _d is the output voltage of the DC power supply, N ₁ , N ₂ , and N ₃ are the first inductance, the second inductance, and the third inductance, respectively. The number of turns of the inductor, D ₁ and D ₂ are the duty ratios of the first switch tube and the second switch tube respectively.

Preferably, the DC power supply is a new energy power supply.

Preferably, the new energy power source is a photovoltaic panel.

Preferably, the DC power supply is an energy storage battery.

Preferably, both the first switch tube and the second switch tube are N-type metal-oxide-semiconductor NMOS, and the drain of the NMOS serves as the first end of the first switch tube and the second switch tube The first terminal of the NMOS is used as the second terminal of the first switching transistor and the second terminal of the second switching transistor.

Preferably, both the first switch tube and the second switch tube are insulated gate bipolar transistors (IGBTs), and the collector of the IGBT serves as the first end of the first switch tube and the second end of the second switch tube. At one end, the emitter of the IGBT serves as the second end of the first switch tube and the second end of the second switch tube.

Preferably, the first inductor, the second inductor and the third inductor share one magnetic core.

Compared with the structure of the existing power electronic transformer, the structure of the high-gain half-bridge impedance network converter provided by the application determines that it will not have a through phenomenon and has high safety; in addition, the application can change the first switching tube and the duty cycle of the second switching tube, the number of turns of the first inductance, the second inductance and the third inductance to adjust the output voltage of the transformer to obtain an adjustable AC output for buck-boost or DC output with adjustable buck-boost , wide application range, simple control, high efficiency, low cost and small size.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the prior art and the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is a schematic structural view of a power electronic transformer in the prior art;

Fig. 2 is the structural representation of a kind of high-gain half-bridge impedance network converter provided by the present invention;

Fig. 3 is the working principle diagram when the high-gain half-bridge impedance network converter provided by the present invention is in mode 1;

Fig. 4 is the working principle diagram when the high-gain half-bridge impedance network converter provided by the present invention is in mode 2;

FIG. 5 is a working principle diagram of the high-gain half-bridge impedance network converter provided by the present invention in mode 3. FIG.

detailed description

The core of the present invention is to provide a high-gain half-bridge impedance network converter. The structure of the high-gain half-bridge impedance network converter provided by the application determines that it will not have a straight-through phenomenon and has high safety; in addition, the application can pass Change the duty cycle of the first switch tube and the second switch tube, the number of turns of the first inductor, the second inductor and the third inductor to adjust the output voltage of the transformer, and obtain an adjustable AC output or buck-boost Adjustable DC output, wide application range, simple control, high efficiency, low cost and small size.

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Fig. 2. Fig. 2 is a schematic structural diagram of a high-gain half-bridge impedance network converter provided by the present invention. The transformer includes a DC power supply V _d , a diode D ₁ , a first capacitor C ₁ , a second capacitor C ₂ , The third capacitor C ₃ , the first switch tube S ₁ , the second switch tube S ₂ and the three-winding coupled inductor, wherein: the anode of the DC power supply V _d is connected to the first end of the first capacitor C ₁ and the anode of the diode D ₁ respectively connected, the cathode of the diode D1 is connected to the _first end of the first inductor L1 of the three-winding coupled inductor, and the second end of the _first inductor L1 is respectively connected to the _first end of the third inductor L3 of the _three -winding coupled inductor and The first end of the _third capacitor C3 is connected, the second end of the _third inductor L3 is connected to the first end of the _first switching tube S1, and the second end of the _first switching tube S1 is respectively connected to the second switching tube S ₂ is connected to the first end of the load, the second end of the _third capacitor C3 is connected to the first end of the second inductance L ₂ of the three-winding coupled inductor, and the second end of the second inductance L ₂ is respectively connected to The second terminal of the _second switching tube S2, the first terminal of the _second capacitor C2 and the negative pole of the DC power supply _Vd are connected, and the second terminal of the first capacitor _C1 is respectively connected to the _second terminal of the second capacitor C2 and the negative pole of the DC power supply Vd. The second end of the load is connected; wherein, the first end of the first inductance L ₁ , the first end of the second inductance L ₂ and the first end of the third inductance L ₃ are terminals with the same name;

When the _first switch S1 is turned on and the _second switch S2 is turned on or when the _first switch S1 is turned off and the _second switch S2 is turned on:

When the _first switch S1 is turned on and the _second switch S2 is turned off:

Among them, V _O is the output voltage of the converter, V _d is the output voltage of the DC power supply V _d , N ₁ , N ₂ , N ₃ are the first inductor L ₁ , the second inductor L ₂ and the third inductor L ₃ respectively. The number of turns, D ₁ and D ₂ are duty ratios of the first switching tube S ₁ and the second switching tube S ₂ respectively.

Specifically, this application couples through DC power supply V _d , diode D ₁ , first capacitor C ₁ , second capacitor C ₂ , third capacitor C ₃ , first switch tube S ₁ , second switch tube S ₂ and three windings. The inductance is used to build the converter hardware circuit, and then according to actual needs, by controlling the on and off of the _first switch tube S1 and the _second switch tube S2, the _first inductor L1, the _second inductor L2 and the _third inductor L3 The number of turns to control the voltage output of the converter. It is not difficult to conclude that the structure of the high-gain half-bridge impedance network converter provided by the present application determines that it does not have a shoot-through phenomenon and has high safety.

Different from the circuit structure of the existing power electronic transformer, it also determines its working process different from the existing power electronic transformer. The working principle of the device is introduced:

Specifically, the high-gain half-bridge impedance network converter provided by the present invention is divided into the following three situations according to the conduction conditions of the first switch tube S1 and the second switch tube S2:

Please refer to FIG. 3 . FIG. 3 is a working schematic diagram of the high-gain half-bridge impedance network converter in mode 1 provided by the present invention.

When the circuit works in mode ₁ , the first switch tube S1 and the _second switch tube S2 are turned on, the diode D1 is subjected to back pressure and cut off, the DC power supply V _d charges the _first capacitor _C1 , the _third capacitor C3 and The second inductance L ₂ of the three-winding coupled inductor charges the third inductance L ₃ of the three-winding coupled inductor, and the second capacitor C ₂ provides energy for the load.

Please refer to FIG. 4 . FIG. 4 is a working schematic diagram of the high-gain half-bridge impedance network converter in mode 2 provided by the present invention.

When the circuit works in mode 2, the _first switch tube S1 is turned on, the _second switch tube S2 is turned off, the diode D1 is forward _- conducting, and the DC power supply V _d and the first capacitor _C1 are connected to the third winding coupled inductor. The first inductor L ₁ , the second inductor L ₂ of the three-winding coupled inductor, the third capacitor C ₃ , the third inductor L ₃ of the three-winding coupled inductor, and the second capacitor C ₂ are charged and provide energy for the load.

Please refer to FIG. 5 . FIG. 5 is a working principle diagram of the high-gain half-bridge impedance network converter in mode 3 provided by the present invention.

When the circuit works in mode 3, the first switch tube S ₁ is turned off, the second switch tube S ₂ is turned on, the diode D ₁ is forward-conducting, and the DC power supply V _d has a direct effect on the first capacitor C ₁ and the third winding coupling inductor. The first inductor L ₁ , the second inductor L ₂ of the three-winding coupled inductor, and the third capacitor C ₃ are charged, and the second capacitor C ₂ provides energy for the load.

According to the analysis of the inductance and capacitance in the above three modes, the voltage of the first inductance L1 of the three-winding coupled inductance and the output voltage of the converter are respectively:

According to the volt-second balance theorem of inductors and the ampere-second balance theorem of capacitors, we can get:

When the transformer is in mode 1 and mode 3:

When the transformer is in mode 2:

It can be seen that the output voltage of the converter is jointly determined by the duty cycle of the _first switching tube S1 and the _second switching tube S2, the number of turns of the _first inductor L1, the _second inductor L2 and the _third inductor L3, according to It is necessary to change the duty cycle of the _first switching tube S1 and the _second switching tube S2, the number of turns of the _first inductance L1, the _second inductance L2 and the _third inductance L3 to obtain the required AC voltage or positive Negative DC power supply V _d .

In addition, in the high-gain half-bridge impedance network converter provided by the present application, the two ends of the _second capacitor C2 and the _third capacitor C3 can also be connected to the load respectively, so as to realize power supply for multiple loads at the same time, which satisfies the needs of industrial development.

To sum up, compared with the structure of the existing power electronic transformer, the structure of the high-gain half-bridge impedance network converter provided by this application determines that it will not have a through phenomenon and has high safety; in addition, this application can be changed by changing the first The duty cycle of the first switching tube and the second switching tube, the number of turns of the first inductance, the second inductance and the third inductance are used to adjust the output voltage of the transformer, so as to obtain an adjustable step-up and step-down AC output or an adjustable step-down step-up DC output, wide application range, simple control, high efficiency, low cost and small size.

On the basis of above-mentioned embodiment:

As a preferred embodiment, the DC power supply V _d is a new energy power supply.

Specifically, the DC power supply V _d here can be the first new energy power supply. As a clean energy, new energy has received strong support from the state. New energy has the advantages of high utilization value, environmental protection, and inexhaustibility. . Certainly, the DC power supply V _d here may also be other types of DC power supplies, which are not specifically limited in this application.

As a preferred embodiment, the new energy source is a photovoltaic panel.

Specifically, photovoltaic panels convert the energy contained in sunlight into electrical energy, which is clean and environmentally friendly without any pollution. Certainly, the new energy power source here may also be other types of new energy power sources, such as wind power panels, which are not specifically limited in this application.

As a preferred embodiment, the DC power supply V _d is an energy storage battery.

Specifically, the energy storage battery here may be a storage battery or a power battery, which is not specifically limited in this application.

As a preferred embodiment, both the _first switch S1 and the _second switch S2 are N-type metal-oxide-semiconductor NMOS, and the drain of the NMOS serves as the first terminal of the first switch S1 and the _first end of the second switch S1. The first terminal of the _second switching transistor S2 and the source of the NMOS serve as the second terminal of the _first switching transistor S1 and the second terminal of the _second switching transistor S2.

As a preferred embodiment, both the _first switching tube S1 and the _second switching tube S2 are insulated gate bipolar transistors IGBT, and the collector of the IGBT serves as the first terminal of the _first switching tube S1 and the second switch The first end of the tube S2 and the emitter of the IGBT serve as the _second end of the _first switching tube S1 and the second end of the _second switching tube S2.

Specifically, in practical applications, if the current in the transformer is very large, the _first switching tube S1 and the _second switching tube S2 here can also be NMOS modules connected in parallel by multiple NMOSs, or multiple IGBTs connected in parallel IGBT modules.

In addition, the first switching tube S ₁ and the second switching tube S ₂ here can also be selected from other types of switching tubes, which are not specifically limited in this application and are determined according to actual conditions.

As a preferred embodiment, the first inductor L ₁ , the second inductor L ₂ and the third inductor L ₃ share a magnetic core.

Specifically, the first inductance L ₁ , the second inductance L ₂ and the third inductance L ₃ in the three-winding coupled inductor provided by the present application can be wound on a magnetic core, which reduces the volume and cost, and the circuit The structure is simple and easy for industrial realization.

It should be noted that in this specification, relative terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations Any such actual relationship or order exists between. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. A high-gain half-bridge impedance network converter is characterized in that it comprises a DC power supply, a diode, a first capacitor, a second capacitor, a third capacitor, a first switching tube, a second switching tube and three winding coupling inductors, Wherein: the anode of the DC power supply is respectively connected to the first end of the first capacitor and the anode of the diode, and the cathode of the diode is connected to the first end of the first inductor of the three-winding coupled inductor, so The second end of the first inductance is respectively connected to the first end of the third inductance of the three-winding coupled inductance and the first end of the third capacitor, and the second end of the third inductance is connected to the first end of the first inductor. The first end of the switch tube is connected, the second end of the first switch tube is connected to the first end of the second switch tube and the first end of the load, and the second end of the third capacitor is connected to the first end of the load. The first end of the second inductor of the three-winding coupled inductor is connected, and the second end of the second inductor is respectively connected to the second end of the second switching tube, the first end of the second capacitor, and the DC power supply. connected to the negative pole of the first capacitor, and the second end of the first capacitor is respectively connected to the second end of the second capacitor and the second end of the load; wherein, the first end of the first inductor, the second The first end of the inductance and the first end of the third inductance are terminals with the same name; When the first switch tube is turned on and the second switch tube is turned on or when the first switch tube is turned off and the second switch tube is turned on: <mrow><msub><mi>V</mi><mi>O</mi></msub><mo>=</mo><mfrac><mrow><mo>-</mo><msub><mi>V</mi><mi>d</mi></msub><msub><mi>D</mi><mn>2</mn></msub><mrow><mo>(</mo><mn>1</mn><mo>-</mo><mfrac><msub><mi>N</mi><mn>2</mn></msub><msub><mi>N</mi><mn>3</mn></msub></mfrac><mo>)</mo></mrow></mrow><mrow><mfrac><msub><mi>N</mi><mn>2</mn></msub><msub><mi>N</mi><mn>3</mn></msub></mfrac><mo>+</mo><mrow><mo>(</mo><msub><mi>D</mi><mn>1</mn></msub><mo>+</mo><msub><mi>D</mi><mn>2</mn></msub><mo>-</mo><mn>2</mn><mo>)</mo></mrow><mo>+</mo><mfrac><msub><mi>N</mi><mn>1</mn></msub><msub><mi>N</mi><mn>3</mn></msub></mfrac><mrow><mo>(</mo><msub><mi>D</mi><mn>1</mn></msub><mo>+</mo><msub><mi>D</mi><mn>2</mn></msub><mo>-</mo><mn>1</mn><mo>)</mo></mrow></mrow></mfrac></mrow> When the first switch tube is turned on and the second switch tube is turned off: <mrow><msub><mi>V</mi><mi>O</mi></msub><mo>=</mo><mfrac><mrow><mo>-</mo><msub><mi>V</mi><mi>d</mi></msub><mrow><mo>(</mo><msub><mi>D</mi><mn>2</mn></msub><mo>-</mo><mn>1</mn><mo>)</mo></mrow><mrow><mo>(</mo><mn>1</mo>mn><mo>-</mo><mfrac><msub><mi>N</mi><mn>2</mn></msub><msub><mi>N</mi><mn>3</mn></msub></mfrac><mo>)</mo></mrow></mrow><mrow><mfrac><msub><mi>N</mi><mn>2</mn></msub><msub><mi>N</mi><mn>3</mn></msub></mfrac><mo>+</mo><mrow><mo>(</mo><msub><mi>D</mi><mn>1</mn></msub><mo>+</mo><msub><mi>D</mi><mn>2</mn></msub><mo>-</mo><mn>2</mn><mo>)</mo></mrow><mo>+</mo><mfrac><msub><mi>N</mi><mn>1</mn></msub><msub><mi>N</mi><mn>3</mn></msub></mfrac><mrow><mo>(</mo><msub><mi>D</mi><mn>1</mn></msub><mo>+</mo><msub><mi>D</mi><mn>2</mn></msub><mo>-</mo><mn>1</mn><mo>)</mo></mrow></mrow></mfrac><mo>;</mo></mrow> Wherein, V _O is the output voltage of the converter, V _d is the output voltage of the DC power supply, N ₁ , N ₂ , and N ₃ are the first inductance, the second inductance, and the third inductance, respectively. The number of turns of the inductor, D ₁ and D ₂ are the duty ratios of the first switch tube and the second switch tube respectively. 2. The high-gain half-bridge impedance network converter according to claim 1, wherein the DC power supply is a new energy power supply. 3. The high-gain half-bridge impedance network converter according to claim 2, wherein the new energy source is a photovoltaic panel. 4. The high-gain half-bridge impedance network converter according to claim 1, wherein the DC power supply is an energy storage battery. 5. The high-gain half-bridge impedance network converter as claimed in claim 1, wherein the first switch tube and the second switch tube are all N-type metal-oxide-semiconductor NMOS, and the drain of NMOS pole as the first end of the first switch tube and the first end of the second switch tube, and the source of the NMOS as the second end of the first switch tube and the second end of the second switch tube . 6. The high-gain half-bridge impedance network converter according to claim 1, wherein the first switching tube and the second switching tube are both insulated gate bipolar transistors (IGBTs), and the collectors of the IGBTs serve as The first end of the first switch tube and the first end of the second switch tube, and the emitter of the IGBT serve as the second end of the first switch tube and the second end of the second switch tube. 7. The high-gain half-bridge impedance network converter according to any one of claims 1-6, wherein the first inductor, the second inductor and the third inductor share one iron core.