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CN113346744A - Three-inductor high-gain Boost converter - Google Patents

Three-inductor high-gain Boost converter Download PDF

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CN113346744A
CN113346744A CN202110706906.5A CN202110706906A CN113346744A CN 113346744 A CN113346744 A CN 113346744A CN 202110706906 A CN202110706906 A CN 202110706906A CN 113346744 A CN113346744 A CN 113346744A
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diode
inductor
capacitor
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cathode
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CN113346744B (en
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秦杨
许兴
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Jiangsu University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators

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Abstract

本发明公开了一种三电感高增益Boost变换器，变换器的直流电源正极与输入滤波电容正极、第一电感一端、第二二极管阳极、第四二极管阳极连接；第一电感另一端与第一二极管阳极、第一电容负极连接；第一二极管阴极与第二电感一端、第二二极管阴极连接；第二电感另一端与第三二极管阳极、第二电容负极连接；第二电容正极与第四二极管阴极、第三电感一端连接；第三电感另一端与第一电容正极、第三二极管阴极、第五二极管阳极、开关管漏极连接；第五二极管阴极与输出滤波电容正极、直流负载一端连接；直流负载另一端与输出滤波电容负极、开关管源极、输入滤波电容负极、输入电源负极相连。

Figure 202110706906

The invention discloses a three-inductance high-gain boost converter. The positive pole of the DC power supply of the converter is connected to the positive pole of the input filter capacitor, one end of the first inductance, the anode of the second diode and the anode of the fourth diode; One end is connected to the anode of the first diode and the cathode of the first capacitor; the cathode of the first diode is connected to one end of the second inductor and the cathode of the second diode; the other end of the second inductor is connected to the anode of the third diode and the cathode of the second diode. The cathode of the capacitor is connected; the anode of the second capacitor is connected to the cathode of the fourth diode and one end of the third inductor; the other end of the third inductor is connected to the anode of the first capacitor, the cathode of the third diode, the anode of the fifth diode, and the leakage of the switch tube. The cathode of the fifth diode is connected to the positive pole of the output filter capacitor and one end of the DC load; the other end of the DC load is connected to the negative pole of the output filter capacitor, the source of the switch tube, the negative pole of the input filter capacitor, and the negative pole of the input power supply.

Figure 202110706906

Description

Three-inductor high-gain Boost converter
Technical Field
The invention belongs to the technical field of DC-DC Boost converters, and particularly relates to a three-inductor high-gain Boost converter.
Background
In recent years, environmental pollution and energy shortage have attracted much attention all over the world. For this reason, pollution-free and renewable energy sources such as solar energy, wind energy, and the like have been rapidly developed. However, the terminal voltage of a renewable energy power generation unit such as a fuel cell, a photovoltaic cell, or the like is low and the range of variation is wide. Therefore, a distributed renewable energy grid-connected power generation system generally adopts a two-stage structure of a direct-current boost converter cascade voltage type inverter. At present, a leakage current suppression strategy of a non-isolated grid-connected inverter is mature day by day, and the electrical safety problem is perfectly solved. Compared with an isolated converter, the non-isolated converter has the advantages of small size, low cost and low loss. Therefore, the adoption of the non-isolated boost converter as the renewable energy interface converter is more advantageous.
The Boost converter is the most widely used non-isolated Boost converter. The input current is continuous, the structure is simple, but the actual voltage gain is influenced by the parasitic parameters of the circuit and has a maximum value, generally lower than 5, and the system efficiency is seriously reduced. For this reason, various non-isolated high-gain Boost converters have been reported in recent years. Boost converters based on coupled inductors can obtain higher voltage gain by changing the winding turn ratio of the coupled inductors, but the conversion efficiency is generally lower because leakage inductance energy is difficult to effectively recover. The Boost converter based on the switch inductor changes the connection mode of the inductor by controlling the turn-off and the turn-on of the switch tube, so that higher voltage gain is obtained; however, the boost capability of the converter is slightly insufficient when the converter is used as a renewable energy interface converter.
Disclosure of Invention
In view of this, the present invention provides a three-inductor high-gain Boost converter, which only uses one switching tube and is simple to control; the voltage gain is 2/(1-D)2The extremely large voltage gain can be obtained under the condition of a small duty ratio; the two input inductors share the input current, so the current stress of the inductors is reduced, and a smaller magnetic core can be selected. Therefore, the high-gain converter has the advantages of low cost, high conversion efficiency and extremely strong boosting capacity, and is particularly suitable for a renewable energy power generation system.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a three-inductor high-gain Boost converter comprises a direct current power supply Uin(ii) a The DC power supply UinThe positive electrodes of the two are respectively connected with an input filter capacitor CinPositive electrode of (1), first inductance L1One end of the second diode D2Anode of (2), fourth diode D4The anode of (1); the first inductor L1Are respectively connected with a first diode D1The anode of (2), the first capacitor C1The negative electrode of (1); the first diode D1Are respectively connected with the second inductors L2One end of the second diode D2Of a cathode(ii) a The second inductor L2Are respectively connected with the third diode D3The anode of (2), the second capacitor C2The negative electrode of (1); the second capacitor C2Respectively connected with the fourth diode D4The cathode of (2), the third inductance L3One end of (a); the third inductor L3Are respectively connected with the first capacitor C1The anode of the third diode D3The cathode of the fifth diode D5The anode of (1), the drain of the switching tube S; the fifth diode D5Are respectively connected with the output filter capacitor CoThe positive electrode of (a), one end of the direct current load R; the other end of the direct current load R is respectively connected with the output filter capacitor CoNegative pole of (1), source electrode of the switching tube S, and the input filter capacitor CinNegative pole of, the input power UinThe negative electrode of (1).
Further, the ideal voltage gain G of the high-gain Boost converter is:
Figure BDA0003131726780000021
wherein D is the duty ratio of the control signal of the switching tube S.
Furthermore, the high-gain Boost converter is realized in one switching period T by adjusting the on and off of the switching tube SsSwitching between the working mode 1 and the working mode 2 in the system.
Further, the working mode 1, t0～t1Stage (2): at t0At any moment, the switching tube S is switched on; first diode D1And a fifth diode D5Off, second diode D2A third diode D3And a fourth diode D4Conducting; at t1At that time, the switching tube S is turned off, and the operation mode 1 is ended. Mode of operation 2, t1～t2Stage (2): t is t1At the moment, the first diode D1And a fifth diode D5On, the second diode D2A third diode D3And a fourth diode D4Turning off; t is t2At the moment, the switching tube S is conducted, the working mode 2 is finished, and the next switching period is started.
Further, in the working mode 1, the first inductor L1Current i ofL1A second inductor L2Current i ofL2A third inductor L3Current i ofL3The average linearity is increased; power supply UinThrough the switch tube S and the first capacitor C1To the first inductor L1Charging; through a switch tube S and a second diode D2And a third diode D3To the second inductance L2Charging; through a switching tube S and a fourth diode D4To the third inductance L3Charging; through a switch tube S and a third diode D3And a fourth diode D4To a second capacitance C2Charging; at the same time, output filter capacitor CoThe dc load R is supplied with power alone. In the working mode 2, the current i of the first inductorL1Current i of the second inductorL2And current i of the third inductorL3A linear decrease; power supply UinA second capacitor C2A first inductor L1A second inductor L2And a third inductor L3Connected in series through a fifth diode D5To the output filter capacitor CoAnd a direct current load R supplies power; at the same time, the second capacitor C2A second inductor L2And a third inductor L3Through a first diode D1To the first capacitor C1And (6) charging.
Advantageous effects
Compared with the prior art, the three-inductor high-gain Boost converter provided by the invention only adopts 1 switching tube, 4 capacitors, 3 inductors and 5 diodes, and has relatively simple structure; the boosting capacity is extremely strong, and the voltage gain is 2/(1-D)2(ii) a And only one switching tube is adopted, so that the control is simpler. In addition, the second inductor L of the non-isolated high-gain DC converter2And a third inductance L3The input current is shared together, so the current stress is reduced, and a smaller magnetic core can be selected; meanwhile, the on-state loss of the diode is reduced. Therefore, the Boost converter with increased gain is suitable forRenewable energy grid-connected power generation system.
Drawings
Fig. 1 is a schematic circuit diagram of a three-inductor high-gain Boost converter according to an embodiment of the present disclosure;
FIGS. 2(a) - (b) show the high-gain Boost converter shown in FIG. 1 during a switching period TsEquivalent diagrams of 2 working modes in the system;
fig. 3 is a diagram of the main operating waveforms of the high-gain Boost converter shown in fig. 1 during one switching period;
FIG. 4 is an equivalent circuit schematic of the average current of the high-gain Boost converter shown in FIG. 1;
fig. 5 is a simulated waveform diagram of the high-gain Boost converter shown in fig. 1.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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.
The invention provides a three-inductor high-gain Boost converter, and the circuit structure is shown in figure 1. The high-gain Boost converter comprises a direct-current power supply UinAn input filter capacitor CinA first inductor L1A second inductor L2A third inductor L3A switch tube S and a first diode D1A second diode D2A third diode D3A fourth diode D4A fifth diode D5A first capacitor C1A second capacitor C2An output filter capacitor CoA direct current load R; DC power supply UinThe positive electrodes of the two are respectively connected with an input filter capacitor CinPositive electrode of (1), first inductance L1One end of the second diode D2Anode of (2), fourth diode D4The anode of (1); first inductance L1Are respectively connected with a first diode D1Anode of, first capacitor C1The negative electrode of (1); first diode D1Are respectively connected with the second inductors L2One end of the second diode D2A cathode of (a); second inductance L2Are respectively connected with a third diode D3Anode of, a second capacitor C2The negative electrode of (1); second capacitor C2Respectively connected with a fourth diode D4Cathode of (2), third inductance L3One end of (a); third inductance L3The other ends of the first and second capacitors are respectively connected with a first capacitor C1Anode of (2), third diode D3Cathode of (2), fifth diode D5The anode of (2) and the drain of the switching tube S; fifth diode D5The cathodes of the two capacitors are respectively connected with an output filter capacitor CoThe positive electrode of (1), one end of a direct current load R; the other end of the DC load R is respectively connected with an output filter capacitor CoNegative pole of (1), source electrode of switching tube S, and input filter capacitor CinNegative pole, input power UinThe negative electrode of (1).
The operation of the high-gain Boost converter shown in fig. 1 is explained below.
To simplify the analysis, the following assumptions were made: switch tube S, first diode D1A second diode D2A third diode D3A fourth diode D4A fifth diode D5An input filter capacitor CinA first capacitor C1A second capacitor C2An output filter capacitor CoA first inductor L1A second inductor L2A third inductor L3All are ideal devices; a first capacitor C1A second capacitor C2An output filter capacitor CoLarge enough that voltage ripple is negligible; first inductance L1A second inductor L2A third inductor L3The current of (2) is continuous; input power supply UinThe negative terminal is a zero potential reference point, and the direct current load R is pure resistance. Based on the above assumptions, after entering the steady state, the operation of the converter in one switching cycle can be divided into 2 modes.
The equivalent circuits of the modes are shown in fig. 2(a) to 2 (b). The main waveforms during one switching cycle are shown in fig. 3.
The following are distinguished:
(1) mode 1, t0～t1Stage (2): at t0At any moment, the switching tube S is switched on; equivalent Circuit As shown in FIG. 2(a), a first diode D1And a fifth diode D5Off, second diode D2A third diode D3And a fourth diode D4And conducting. As shown in fig. 3, the first inductor L1Current i ofL1A second inductor L2Current i ofL2A third inductor L3Current i ofL3All increase linearly. Power supply UinThrough the switch tube S and the first capacitor C1To the first inductor L1Charging; through a switch tube S and a second diode D2And a third diode D3To the second inductance L2Charging; through a switching tube S and a fourth diode D4To the third inductance L3Charging; through a switch tube S and a third diode D3And a fourth diode D4To a second capacitance C2Charging; at the same time, output filter capacitor CoThe dc load R is supplied with power alone. At this time, there are:
Figure BDA0003131726780000041
wherein L is1Is a first inductance L1Inductance value of, L2Is a second inductance L2Inductance value of, L3Is a third inductance L3Inductance value of, UinFor input voltage, UC1Is a first capacitor C1A voltage.
At t1At the moment, the switching tube S is turned off, and the mode 1 is ended;
(2) mode 2, t1～t2Stage (2): t is t1At that time, the equivalent circuit is as shown in FIG. 2(b), the first diode D1And a fifth diode D5On, the second diode D2A third diode D3And a fourth diode D4And (6) turning off. As shown in fig. 3, the current i of the first inductorL1Current of the second inductoriL2And current i of the third inductorL3The linearity decreases. Power supply UinA second capacitor C2A first inductor L1A second inductor L2And a third inductor L3Connected in series through a fifth diode D5To the output filter capacitor CoAnd a direct current load R supplies power; at the same time, the second capacitor C2A second inductor L2And a third inductor L3Through a first diode D1To the first capacitor C1And (6) charging. At this time, there are:
Figure BDA0003131726780000042
wherein, UC2Is a second capacitor C2Voltage, UoIs the output voltage.
t2At the moment, the switching tube S is turned on, the mode 2 ends, and the next switching cycle is entered.
Based on the above working principle, the steady-state characteristics of the high-gain Boost converter of the present invention are analyzed below.
From the volt-second balance of 3 inductances, we can obtain:
Figure BDA0003131726780000051
from FIG. 2(a), the second capacitor C can be seen2The voltage stress of (a) is:
UC2＝Uin (4)
according to equations (3) and (4), the ideal voltage gain G of the high-gain Boost converter of the present invention can be obtained as:
Figure BDA0003131726780000052
a first capacitor C1The voltage stress of (a) is:
Figure BDA0003131726780000053
after the steady state is entered, the average current of the capacitor is zero, so that an equivalent circuit diagram of the average current of the high-gain Boost converter shown in fig. 4 can be obtained, and the following formula can be obtained from fig. 4:
Figure BDA0003131726780000054
in the above formula, IL1Is a first inductance L1Average current value of (1)L2Is a second inductance L2Average current value of (1)L3Is a third inductance L3Average current value of (1)D1Is a first diode D1Average current value of (1)D2Is a second diode D2Average current value of (1)D3Is a third diode D3Average current value of (1)D4Is a fourth diode D4Average current value of (1)D5Is a fifth diode D5Average current value of (1)SIs the average current value, I, of the switching tube SinIs the average value of the input current, IoIs the average value of the output current.
As can be seen from equation (7), the second inductor L of the high-gain Boost converter of the present invention2And a third inductance L3Shared sharing of input current IinTherefore, the current stress is reduced, and a smaller magnetic core can be selected; at the same time, the first diode D1A second diode D2A third diode D3A fourth diode D4And a fifth diode D5The average current value of (a) is smaller, reducing the on-state loss of the diodes in the converter.
The parameter design is carried out on the high-gain Boost converter of the invention as follows:
the design criteria of the converter are: switching frequency fs100kHz, input voltage U in20V, maximum output power Po,max250W, output voltage Uo＝400V。
According to the indexes, the duty ratio D of the high-gain Boost converter obtained by the formula (5) meets the following requirements:
Figure BDA0003131726780000061
the duty cycle D, which can be derived from equation (8), is:
D＝0.684 (9)
it is generally required that the maximum current ripple allowed by the inductor does not exceed 20% of its maximum average current, i.e. the first inductor L1Pulsating quantity of current Δ IL1A first inductor L1Maximum average current I ofL1,maxSatisfies the following conditions: delta IL1≤0.2IL1,maxThen, there are:
Figure BDA0003131726780000062
similarly, the second inductor L2Pulsating quantity of current Δ IL2A third inductor L3Pulsating quantity of current Δ IL3A second inductor L2Maximum average current I ofL2,maxAnd a third inductance L3Maximum average current I ofL3,maxSatisfies the following conditions: delta IL2＝ΔIL3≤0.2IL2,max＝0.2IL3,maxThen, there are:
Figure BDA0003131726780000063
it is generally required that the capacitor voltage does not fluctuate by more than 1% of the average value of the capacitor voltage. Namely: a first capacitor C1Voltage pulsation Δ UC1And a first capacitor C1Voltage UC1Satisfies the following conditions: delta UC1≤0.01UC1Then, there are:
Figure BDA0003131726780000071
similarly, the second capacitor C2Voltage pulsation Δ UC2And a second capacitor C2Voltage UC2Satisfies the following conditions: delta UC2≤0.01UC2Then, there are:
Figure BDA0003131726780000072
similarly, the output filter capacitor CoVoltage pulsation Δ UCoAnd an output filter capacitor CoVoltage UCoSatisfies the following conditions: delta UCo≤0.01UCoThen, there are:
Figure BDA0003131726780000073
based on the above modal analysis, working condition analysis and parameter design of the high-gain Boost converter of the invention, simulation verification is performed as follows:
in order to verify the correctness of theoretical analysis, according to the parameter design, Saber simulation software is used for carrying out simulation verification on the high-gain Boost converter, and specific values are as follows: a first capacitor C147 muF, second capacitance C247 μ F; first inductance L12.5mH, second inductance L20.12 mH; third inductance L30.12 mH; output capacitor Co47 muF, input filter capacitance Cin＝47μF。
FIG. 5 is a simulation waveform of the high-gain Boost converter of the present invention, showing the driving signal u of the switching tube SgsInput voltage uinOutput voltage uoThe simulated waveform of (2). It can be seen that when the input voltage U is appliedin20V, output voltage UoWhen the voltage is 400V, the duty ratio D is approximately equal to 0.684, and the actually measured voltage gain G is equal to Uo/U in20, with the theoretical value G2/(1-D)220 substantially coincide.
The high-gain Boost converter provided by the invention has the following advantages: (1) the Boost capability is extremely strong, and the voltage gain of the high-gain Boost converter is 2/(1-D)2(ii) a (2) Only 1 switch tube, 4 capacitors, 3 inductors and 5 inductors are adoptedThe diode has a relatively simple structure; (3) only one switching tube is provided, and the control circuit is simple; (4) second inductance L2And a third inductance L3Shared sharing of input current IinTherefore, the current stress is reduced, and a smaller magnetic core can be selected.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea, and not to limit it. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall into the protection scope of the present invention.

Claims (4)

1.一种三电感高增益Boost变换器，其特征在于，包括直流电源Uin；所述直流电源Uin的正极分别连接输入滤波电容Cin的正极、第一电感L1的一端、第二二极管D2的阳极、第四二极管D4的阳极；所述第一电感L1的另一端分别连接第一二极管D1的阳极、所述第一电容C1的负极；所述第一二极管D1的阴极分别连接所述第二电感L2的一端、所述第二二极管D2的阴极；所述第二电感L2的另一端分别连接所述第三二极管D3的阳极、所述第二电容C2的负极；所述第二电容C2的正极分别连接所述第四二极管D4的阴极、所述第三电感L3的一端；所述第三电感L3的另一端分别连接所述第一电容C1的正极、所述第三二极管D3的阴极、所述第五二极管D5的阳极、所述开关管S的漏极；所述第五二极管D5的阴极分别连接所述输出滤波电容Co的正极、所述直流负载R的一端；所述直流负载R的另一端分别连接所述输出滤波电容Co的负极、所述开关管S的源极、所述输入滤波电容Cin的负极、所述输入电源Uin的负极。1. a three-inductance high-gain Boost converter, is characterized in that, comprises DC power supply U in ; The positive pole of described DC power supply U in is respectively connected to the positive pole of input filter capacitor C in , one end of the first inductance L 1 , the second The anode of the diode D2 and the anode of the fourth diode D4; the other end of the first inductor L1 is respectively connected to the anode of the first diode D1 and the cathode of the first capacitor C1 ; The cathode of the first diode D1 is respectively connected to one end of the second inductance L2 and the cathode of the second diode D2; the other end of the second inductance L2 is respectively connected to the second inductance L2. The anode of the three diodes D3 and the cathode of the second capacitor C2 ; the anode of the second capacitor C2 is connected to the cathode of the fourth diode D4 and the cathode of the third inductor L3 respectively. one end; the other end of the third inductor L3 is respectively connected to the anode of the first capacitor C1 , the cathode of the third diode D3 , the anode of the fifth diode D5, and the The drain of the switch tube S; the cathode of the fifth diode D5 is respectively connected to the anode of the output filter capacitor C o and one end of the DC load R; the other end of the DC load R is respectively connected to the The negative electrode of the output filter capacitor C o , the source electrode of the switch tube S, the negative electrode of the input filter capacitor C in , and the negative electrode of the input power supply U in . 2.根据权利要求1所述的一种三电感高增益Boost变换器，其特征在于，高增益Boost变换器的理想电压增益G为：
Figure FDA0003131726770000011
其中，D为开关管S的控制信号的占空比。2. a kind of three-inductance high-gain Boost converter according to claim 1, is characterized in that, the ideal voltage gain G of high-gain Boost converter is:
Figure FDA0003131726770000011
Among them, D is the duty ratio of the control signal of the switch S. 3.根据权利要求1或2所述的一种三电感高增益Boost变换器，其特征在于，通过调节开关管S的开通和关断，实现高增益Boost变换器在一个开关周期Ts内的工作模态1和工作模态2的切换；工作模态1，t0～t1阶段：在t0时刻，开通开关管S；第一二极管D1和第五二极管D5关断，第二二极管D2、第三二极管D3和第四二极管D4导通；在t1时刻，开关管S关断，工作模态1结束；工作模态2，t1～t2阶段：t1时刻，第一二极管D1和第五二极管D5导通，第二二极管D2、第三二极管D3和第四二极管D4关断；t2时刻，开关管S导通，工作模态2结束，进入下一个开关周期。3. a kind of three-inductance high-gain Boost converter according to claim 1 and 2, it is characterized in that, by adjusting the opening and shut-off of switch tube S, realize high-gain Boost converter in a switching cycle T s Switching between working mode 1 and working mode 2; working mode 1, t 0 ~ t 1 stage: at time t 0 , the switch S is turned on; the first diode D 1 and the fifth diode D 5 are turned off is turned off, the second diode D 2 , the third diode D 3 and the fourth diode D 4 are turned on; at time t 1 , the switch S is turned off, and the working mode 1 ends; the working mode 2, Stages t 1 to t 2 : at time t 1 , the first diode D 1 and the fifth diode D 5 are turned on, the second diode D 2 , the third diode D 3 and the fourth diode D 4 is turned off; at time t 2 , the switch tube S is turned on, the working mode 2 ends, and the next switching cycle is entered. 4.根据权利要求3所述的一种三电感高增益Boost变换器，其特征在于，在工作模态1时，第一电感L1的电流iL1、第二电感L2的电流iL2、第三电感L3的电流iL3均线性增大；电源Uin通过开关管S和第一电容C1向第一电感L1充电；通过开关管S、第二二极管D2和第三二极管D3向第二电感L2充电；通过开关管S和第四二极管D4向第三电感L3充电；通过开关管S、第三二极管D3和第四二极管D4向第二电容C2充电；同时，输出滤波电容Co单独向直流负载R供电；在工作模态2时，第一电感的电流iL1、第二电感的电流iL2和第三电感的电流iL3线性减小；电源Uin、第二电容C2、第一电感L1、第二电感L2与第三电感L3串联通过第五二极管D5向输出滤波电容Co和直流负载R供电；同时，第二电容C2、第二电感L2与第三电感L3通过第一二极管D1向第一电容C1充电。4 . The three-inductor high-gain boost converter according to claim 3 , wherein in the working mode 1, the current i L1 of the first inductor L 1 , the current i L2 of the second inductor L 2 , The current i L3 of the third inductor L 3 increases linearly; the power supply U in charges the first inductor L 1 through the switch S and the first capacitor C 1 ; through the switch S, the second diode D 2 and the third Diode D3 charges the second inductor L2 ; charges the third inductor L3 through the switch S and the fourth diode D4; charges the third inductor L3 through the switch S, the third diode D3 and the fourth diode The tube D 4 charges the second capacitor C 2 ; at the same time, the output filter capacitor C o supplies power to the DC load R alone; in the working mode 2, the current i L1 of the first inductor, the current i L2 of the second inductor and the third The inductor current i L3 decreases linearly; the power supply U in , the second capacitor C 2 , the first inductor L 1 , the second inductor L 2 and the third inductor L 3 are connected in series to the output filter capacitor C through the fifth diode D 5 o and the DC load R are powered; at the same time, the second capacitor C 2 , the second inductor L 2 and the third inductor L 3 charge the first capacitor C 1 through the first diode D 1 .
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101882869A (en) * 2010-06-21 2010-11-10 华南理工大学 High Gain Boost Converter with LC Switching Network
CN110535339A (en) * 2019-09-09 2019-12-03 南通大学 A kind of quadratic form Boost of low capacitance voltage stress
CN111245223A (en) * 2020-01-15 2020-06-05 广东工业大学 Low-voltage stress boost converter and expanded low-voltage stress boost converter
TWI696349B (en) * 2019-05-31 2020-06-11 遠東科技大學 High voltage gain step-up converter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101882869A (en) * 2010-06-21 2010-11-10 华南理工大学 High Gain Boost Converter with LC Switching Network
TWI696349B (en) * 2019-05-31 2020-06-11 遠東科技大學 High voltage gain step-up converter
CN110535339A (en) * 2019-09-09 2019-12-03 南通大学 A kind of quadratic form Boost of low capacitance voltage stress
CN111245223A (en) * 2020-01-15 2020-06-05 广东工业大学 Low-voltage stress boost converter and expanded low-voltage stress boost converter

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