CN114285279A - High-gain boost converter - Google Patents

High-gain boost converter Download PDF

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CN114285279A
CN114285279A CN202111628437.6A CN202111628437A CN114285279A CN 114285279 A CN114285279 A CN 114285279A CN 202111628437 A CN202111628437 A CN 202111628437A CN 114285279 A CN114285279 A CN 114285279A
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diode
inductor
boost converter
switching tube
capacitor
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许杰
马小三
王子豪
孙智博
吴梦杰
毛文龙
吴晨
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Anhui University of Technology AHUT
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Anhui University of Technology AHUT
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Abstract

The invention discloses a high-gain boost converter, which belongs to the technical field of converters and comprises a direct current input source, three inductors, two capacitors, two switching tubes, five diodes and a load. The invention realizes high voltage gain through charging and discharging of the capacitor and the switch inductor, reduces the use of the capacitor and improves the reliability of the converter; the circuit can work in the whole variation range of the duty ratio, and the driving signals of the two switching tubes are synchronous, so that the control circuit is simpler to realize; the voltage stress of the switching tube is reduced, the switching tube has higher voltage gain under the same duty ratio, the application occasions are wider, and the switching tube has good application value in the field of renewable clean energy; the total number of used devices is less, the structure is simple, the cost performance of the converter is higher, and the use value of the converter is improved.

Description

High-gain boost converter
Technical Field
The invention relates to the technical field of converters, in particular to a high-gain boost converter.
Background
With the reduction of fossil energy and the implementation of a series of environmental governance policies, the development and utilization of novel renewable clean energy sources such as wind energy and solar energy are widely focused and researched, and become a preferred scheme for solving the energy crisis. However, most renewable energy sources have the disadvantage of low output voltage, and cannot meet the requirements of direct grid connection and equipment power supply. In order to satisfy these energy sources, it is necessary to boost and convert the low output voltage, and therefore, the high-gain DC/DC boost converter becomes an essential part of the renewable energy system.
The basic Boost converter is widely used due to its boosting capability and simple structure, and it is difficult to realize a high voltage gain in practical use, though it realizes a high voltage output by adjusting the duty ratio. Converter topologies with transformers can achieve high voltage levels, but the leakage inductance present makes them less efficient. Therefore, non-isolated boost converters are becoming more and more popular with researchers.
Chinese patent application publication No. CN106549573A, published as: on 29/3/2017, the application discloses a high-boost dc converter with a switched inductor, which includes a dc input source Vin, 4 inductors, 5 capacitors, 12 diodes, and 2 switching tubes. The high voltage gain is realized through the charging and discharging of the capacitor and the switch inductor, the voltage stress of the switch tube is also reduced, the ripple wave of the output direct current voltage is reduced, and the cost performance of the direct current converter circuit is improved. The converter has the disadvantages that more devices are needed by the circuit, so that the application cost of the converter is increased virtually, and the reliability of the converter is reduced due to the more capacitor devices. To this end, a high gain boost converter is proposed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to improve the voltage gain, reduce the voltage stress of the switch tube, reduce the using quantity of the capacitor devices, improve the reliability of the converter and provide the high-gain boost converter.
The invention solves the technical problems by the following technical scheme, and the invention comprises a direct current input source, three inductors (a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth inductor, a sixth inductor, a fifth diode, a sixth diode and a load; the second diode, the third diode and the fourth diode form a switch inductance unit together with a second inductor and a third inductor, and the sizes of the second inductor and the third inductor are equal; the anode of the direct current input source is connected with one end of the first inductor, one end of the second inductor and the anode of the third diode respectively; the other end of the first inductor is respectively connected with the drain electrode of the first switching tube and one end of the second capacitor; the source electrode of the first switching tube is connected with the negative electrode of the direct current input source; the other end of the second inductor is connected with the anode of the second diode and the anode of the fourth diode respectively; the cathode of the third diode is respectively connected with the cathode of the fourth diode and one end of the third inductor; the cathode of the second diode is respectively connected with the other end of the third inductor, the drain electrode of the second switching tube and the anode of the fifth diode; the source electrode of the second switch tube is respectively connected with the other end of the second capacitor and the anode of the first diode; the cathode of the fifth diode is respectively connected with one end of the first capacitor and one end of the load; the other end of the first capacitor, the other end of the load and the cathode of the first diode are sequentially connected with the cathode of the direct current input source.
Furthermore, the driving signals of the first switch tube and the second switch tube are synchronous, and the duty ratio range is 0-1.
Further, the voltage gains of the high-gain boost converter are all as follows when the duty ratio is changed within the range of 0< D < 1:
Figure BDA0003440522850000021
wherein M represents a voltage gain of the high-gain boost converter when it is varied within a range of duty ratio 0< D < 1.
Furthermore, when the high-gain boost converter changes in the range of the space ratio 0< D <1, the voltage stress of the first switching tube and the voltage stress of the second switching tube are respectively:
Figure BDA0003440522850000022
Figure BDA0003440522850000023
wherein the content of the first and second substances,
Figure BDA0003440522850000024
indicating high gain boost converter is at duty ratio 0<D<1 voltage stress of the first switching tube when the voltage stress is changed in the range of 1,
Figure BDA0003440522850000025
indicating high gain boost converter is at duty ratio 0<D<1 voltage stress of the second switching tube in the range ofinRepresenting a dc input source.
Furthermore, the voltage stress of the first to fifth diodes when the high-gain boost converter is changed in the range of the duty ratio 0< D <1 is respectively as follows:
Figure BDA0003440522850000026
Figure BDA0003440522850000027
Figure BDA0003440522850000028
Figure BDA0003440522850000029
wherein the content of the first and second substances,
Figure BDA00034405228500000210
respectively indicate that the high-gain boost converter is in an air ratio of 0<D<1, voltage stress of the first to fifth diodes when the voltage stress changes within a range of 1; vinRepresenting a dc input source.
Compared with the prior art, the invention has the following advantages: the high-gain boost converter realizes high voltage gain through charging and discharging of the capacitor and the switch inductor, reduces the use of the capacitor and improves the reliability of the converter; the circuit can work in the whole variation range of the duty ratio, and the driving signals of the two switching tubes are synchronous, so that the control circuit is simpler to realize; the voltage stress of the switching tube is reduced, the switching tube has higher voltage gain under the same duty ratio, the application occasions are wider, and the switching tube has good application value in the field of renewable clean energy; the total number of used devices is less, the structure is simple, the cost performance of the converter is higher, the use value of the converter is improved, and the converter is worthy of being popularized and used.
Drawings
FIG. 1 is a block diagram of the topology of a high gain boost converter of the present invention;
FIG. 2 shows a switching tube S1And a switching tube S2Drive signal V ofgsA drawing;
FIG. 3 is an equivalent circuit diagram of a first operating mode of a high-gain boost converter of the present invention;
fig. 4 is an equivalent circuit diagram of a second operation mode of the high-gain boost converter according to the present invention.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example one
As shown in FIG. 1, a high gain boost converter includes a DC input source VinThree inductors L1～L3Two capacitors C1And CoTwo switching tubes S1And S2Five diodes D1～D5And a load R, a diode D2～D4And an inductance L2And L3Form a switch inductor unit, and an inductor L2And L3Equal in size; the DC input source VinRespectively with the inductor L1One end of (1), an inductance L2And a diode D3The anode of the anode is connected; the inductance L1The other end of the first and second switch tubes are respectively connected with a switch tube S1Drain electrode and capacitor C1One end of the two ends are connected; the switch tube S1Source and dc input source VinThe negative electrodes are connected; the inductance L2The other end of the diode D is respectively connected with the diode D2And diode D4The anode of the anode is connected; the diode D3Respectively with a diode D4Cathode and inductor L3One end of the two ends are connected; the diode D2Respectively with the inductor L3Another end of (1), a switching tube S2And diode D5The anode of the anode is connected; the switch tube S2Respectively with a capacitor C1Another terminal of (1) and a diode D1The anode of the anode is connected; diode D5Respectively with a capacitor CoIs connected with one end of a load R; capacitor CoThe other end of the load R, and a diode D1The cathode is connected with a direct current input source V in sequenceinAre connected with each other. In the embodiment, the driving signals of the switch tube S1 and the switch tube S2 are synchronous, and the duty ratio range is 0-1.
FIG. 2 shows a switching tube S1And a switching tube S2Drive signal V ofgsIn the present embodiment, the switch tube S1And a switching tube S2Simultaneously on or simultaneously off. One period TsDivided into switch on periods TonAnd a switch off period ToffOn time period T of the switchonIs t0-t1And DT is expressed by duty ratio DsSwitch off time period ToffIs t1-t2And a duty cycle D, if expressed, is (1-D) Ts。
Example two
The high-gain boost converter has two working modes, and the detailed analysis is as follows:
working mode one [ t ]0-t1]：
As shown in fig. 3, the switching tube S1And S2In this mode, the diode D is in a conducting state1、D4And D0Are all switched off by bearing reverse bias voltage, and a direct current input source VinTo the inductance L1Charging is carried out, wherein, the direct current is input into the source VinInductor L1And a switching tube S1Forming a loop; inductor L2And L3Diode D2And D3Forward conducting and parallel running, capacitor C1And a DC input source VinTo the inductance L2And L3Charging is carried out, and a capacitor CoForming a loop with the load R, energy being transferred from the capacitor CoTransfer to load R, capacitance C1And a capacitor CoAre all in a discharge state.
Working mode two [ t ]1-t2]：
As shown in fig. 4, the switching tube S1And S2In the off state, inductance L1In a discharge state, a capacitor C1In a charged state, resulting in a diode D1Conducting in the forward direction; inductor L2And L3Are all in a discharge state, diode D4And D0Forward conduction, and turn off diode D2And D3Inductance L2And L3Switched from parallel mode to series mode by diode D4, together with capacitor CoCharging and energy supply of a load R.
EXAMPLE III
Voltage gain calculation
In order to simplify the analysis, the high-gain boost converter in the present embodiment has the same structure and the same operation mode as those in the first embodiment, and in the following analysis, it is assumed that all devices are ideal devices, and two operation modes of the converter are analyzed.
Definition VinIn order to average the input voltage, the voltage is,
Figure BDA0003440522850000041
are respectively an inductance L1、L2、L3Voltage across, VoIn order to average the output voltage of the voltage,
Figure BDA0003440522850000042
are respectively a pass capacitance C1、CoThe current of (2).
When the converter operates in the mode one shown in fig. 3, the dc input source VinTo the inductance L1Charging is carried out, and a capacitor C1And a DC input source VinTo the inductance L2And L3Charging:
Figure BDA0003440522850000043
Figure BDA0003440522850000044
the current flowing through the capacitor in this mode can be expressed as:
Figure BDA0003440522850000045
Figure BDA0003440522850000046
when the converter operates in the second mode as shown in fig. 4, the inductors in the circuit are all in the discharge state, and the capacitors in the circuit are all in the charge state, then:
Figure BDA0003440522850000047
Figure BDA0003440522850000048
the current flowing through the capacitor in this mode can be expressed as:
Figure BDA0003440522850000049
Figure BDA00034405228500000410
according to the volt-second balance principle, the voltage across the inductor should be 0, so that:
DTsVin+(1-D)Ts(Vin-VC1)＝0 (9)
2DTs(Vin+VC1)+(1-D)Ts(Vin-Vo)＝0 (10)
the capacitance C is obtained from (9)1The voltages on are:
Figure BDA0003440522850000051
the voltage gain of the converter obtained from (10) and (11) is:
Figure BDA0003440522850000052
example four
Voltage stress of switching devices
In the high-gain boost converter of the present embodiment, the switching tube S can be derived according to the analysis of the second and third embodiments1And a switching tube S2Voltage stress of (2):
Figure BDA0003440522850000053
Figure BDA0003440522850000054
diode D1～D5The voltage stress of (a) is:
Figure BDA0003440522850000055
Figure BDA0003440522850000056
Figure BDA0003440522850000057
Figure BDA0003440522850000058
as can be seen from the voltage stress formula, only the diode D5Has a voltage stress slightly higher than the output voltage VoSwitching tube S2Voltage stress of is output voltage VoAnd the voltage stress of other switching devices is much smaller, which is beneficial to the model selection of the switching devices.
In summary, the high-gain boost converter of the above embodiment realizes high voltage gain through charging and discharging of the capacitor and the switch inductor, and reduces the use of the capacitor, thereby improving the reliability of the converter; the circuit can work in the whole variation range of the duty ratio, and the driving signals of the two switching tubes are synchronous, so that the control circuit is simpler to realize; the voltage stress of the switching tube is reduced, the switching tube has higher voltage gain under the same duty ratio, the application occasions are wider, and the switching tube has good application value in the field of renewable clean energy; the total number of used devices is less, the structure is simple, the cost performance of the converter is higher, the use value of the converter is improved, and the converter is worthy of being popularized and used.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (5)

1. A high gain boost converter, comprising: the direct current input source, the first inductor, the second inductor, the third inductor, the first capacitor, the second capacitor, the first switch tube, the second switch tube, the first diode, the second diode, the fifth diode and the load; the second diode, the third diode and the fourth diode form a switch inductance unit together with a second inductor and a third inductor, and the sizes of the second inductor and the third inductor are equal; the anode of the direct current input source is connected with one end of the first inductor, one end of the second inductor and the anode of the third diode respectively; the other end of the first inductor is respectively connected with the drain electrode of the first switching tube and one end of the second capacitor; the source electrode of the first switching tube is connected with the negative electrode of the direct current input source; the other end of the second inductor is connected with the anode of the second diode and the anode of the fourth diode respectively; the cathode of the third diode is respectively connected with the cathode of the fourth diode and one end of the third inductor; the cathode of the second diode is respectively connected with the other end of the third inductor, the drain electrode of the second switching tube and the anode of the fifth diode; the source electrode of the second switch tube is respectively connected with the other end of the second capacitor and the anode of the first diode; the cathode of the fifth diode is respectively connected with one end of the first capacitor and one end of the load; the other end of the first capacitor, the other end of the load and the cathode of the first diode are sequentially connected with the cathode of the direct current input source.
2. A high gain boost converter according to claim 1, wherein: the driving signals of the first switching tube and the second switching tube are synchronous, and the duty ratio range is 0-1.
3. A high gain boost converter according to claim 2, wherein: when the high-gain boost converter changes in the range of the space ratio 0< D <1, the voltage gains are all as follows:
Figure FDA0003440522840000011
wherein M represents a voltage gain of the high-gain boost converter when it is varied within a range of duty ratio 0< D < 1.
4. A high gain boost converter according to claim 3, wherein: when the high-gain boost converter changes in the range of the space ratio 0< D <1, the voltage stress of the first switching tube and the voltage stress of the second switching tube are respectively as follows:
Figure FDA0003440522840000012
Figure FDA0003440522840000013
wherein the content of the first and second substances,
Figure FDA0003440522840000014
indicating high gain boost converter is at duty ratio 0<D<1 voltage stress of the first switching tube when the voltage stress is changed in the range of 1,
Figure FDA0003440522840000015
indicating high gain boost converter is at duty ratio 0<D<1 voltage stress of the second switching tube in the range ofinRepresenting a dc input source.
5. A high gain boost converter according to claim 4, wherein: when the high-gain boost converter changes in the range of the space ratio 0< D <1, the voltage stress of the first diode to the voltage stress of the fifth diode are respectively as follows:
Figure FDA0003440522840000016
Figure FDA0003440522840000017
Figure FDA0003440522840000021
Figure FDA0003440522840000022
wherein the content of the first and second substances,
Figure FDA0003440522840000023
respectively indicate that the high-gain boost converter is in an air ratio of 0<D<1, voltage stress of the first to fifth diodes when the voltage stress changes within a range of 1; vinRepresenting a dc input source.
CN202111628437.6A 2021-12-28 2021-12-28 High-gain boost converter Withdrawn CN114285279A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116827126A (en) * 2023-03-23 2023-09-29 广东工业大学 High-gain boost converter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116827126A (en) * 2023-03-23 2023-09-29 广东工业大学 High-gain boost converter
CN116827126B (en) * 2023-03-23 2023-11-28 广东工业大学 High-gain boost converter

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