CN102355128A - High transformation ratio DC (direct current)-DC boost converter - Google Patents

High transformation ratio DC (direct current)-DC boost converter Download PDF

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Publication number
CN102355128A
CN102355128A CN2011103221784A CN201110322178A CN102355128A CN 102355128 A CN102355128 A CN 102355128A CN 2011103221784 A CN2011103221784 A CN 2011103221784A CN 201110322178 A CN201110322178 A CN 201110322178A CN 102355128 A CN102355128 A CN 102355128A
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China
Prior art keywords
diode
anode
voltage
converter
switching tube
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CN2011103221784A
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Chinese (zh)
Inventor
胡雪峰
龚春英
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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Priority to CN2011103221784A priority Critical patent/CN102355128A/en
Publication of CN102355128A publication Critical patent/CN102355128A/en
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Abstract

The invention relates to a high transformation ratio DC (direct current)-DC boost converter topology structure, which has higher boost capacity, belongs to the technical field of power electronics and comprises a DC source input end, a DC output end, two boost inductors L1 and L2, two controllable power switching tubes Q1 and Q2, two intermediate energy storage capacitors C1 and C2, three one-way rectification diodes D1, D2 and D3 and an output filter capacitor C3, wherein the voltages at both ends of the filter capacitor are output voltages, and two ends of the filter capacitor are connected with loads. Compared with the conventional single-phase boost converter or two-phase cross parallel boost converter, the converter disclosed by the invention can realize higher boost transformation ratio of the output voltage to the input voltage, the ripples of the input current and the output voltage can be effectively reduced, and simultaneously the voltage stress of the switching tubes is also effectively reduced, which is conductive to realizing higher power conversion.

Description

Hypermutation compares DC-DC voltage boosting converter
Technical field
The present invention relates to be a kind of hypermutation than DC-DC voltage boosting converter and control method thereof, belong to electric and electronic technical field.
Technical background
DC-DC converter with boost function has obtained extensive use in the industry life, as in grid-connected photovoltaic system, need booster converter that the output voltage of photovoltaic battery array is raise to satisfy the needs of back level combining inverter.Traditional BOOST converter or two parallelly connected BOOST converter that intersects all has boost function; But when the front end input voltage is low; In order to reach higher output voltage; Its switch conduction duty ratio will approach 1; Can reduce the efficient of converter so on the one hand, switching frequency also is difficult for further improving simultaneously.In order to reach the higher no-load voltage ratio of boosting; There is document to propose two BOOST booster converter series connection as front stage converter; Increased the complexity of the sum of series control of system like this; Be unfavorable for the raising of system effectiveness and the improvement of performance; Also there is document to propose to use high frequency transformer to realize boosting inverter; Solve the no-load voltage ratio problem of boosting more greatly, but circuit topological structure is comparatively complicated.Therefore research has the Novel DC-DC converter of the no-load voltage ratio of boosting more greatly, has important theoretical significance and application value.
Summary of the invention
The objective of the invention is to solve the problem that exists in the above-mentioned prior art; A kind of transformerless hypermutation is proposed than DC-DC voltage boosting converter and control method thereof; Circuit topological structure is simple; And control realizes easily; Can effectively reduce simultaneously the ripple of input current and output voltage, improve the performance of converter.The converter of the present invention and traditional two BOOST converter that is in parallel is compared, and has only increased by two intermediate energy storage electric capacity and a diode, can realize above-mentioned good operating characteristic.
High transformation ratio DC-DC converter of the present invention is characterized in that shown in accompanying drawing 1:
1) a kind of hypermutation compares DC-DC voltage boosting converter; Comprise a direct-current input power supplying (Vin); Two boost inductance (L1; L2); Two power switch pipe (Q1; Q2) can be MOSFET or IGBT; Three unidirectional rectifier diode (D1; D2; D3); Two intermediate energy storage electric capacity (C1; C2); An output filter capacitor (C3); Filter capacitor (C3) two ends are output; Filter capacitor (C3) two termination loads; Concrete connected mode is: the positive pole of direct-current input power supplying (Vin) respectively with inductance (L1; L2) connect; The other end of inductance (L1) links to each other with the drain electrode of switching tube (Q1) and the anode of diode (D1) respectively; The other end of inductance (L2) links to each other with the drain electrode of switching tube (Q2) and an end of intermediate energy storage electric capacity (C1) respectively; (C1) the other end is connected to the negative electrode of diode (D1); Anode with diode (D2) links to each other again; The negative electrode of diode (D2) is connected with the anode of diode (D3); Storage capacitor (C2) across is at the anode tap of diode (D1) and cathode terminal (D2); One end of output filter capacitor (C3) is connected to the negative electrode of diode (D3); The other end of filter capacitor (C3) links to each other with the negative pole of direct-current input power supplying (Vin); Draw the load of output termination from the two ends of (C3), the source electrode of switching tube (Q1) and (Q2) is connected with the negative pole of direct-current input power supplying (Vin) simultaneously.
2) converter using switching tube of the present invention (Q1) and (Q2) fully complementary method control, control method is simple, is easy to realize.Compare with two staggered parallelly connected BOOST converters with traditional BOOST converter, converter of the present invention under the situation of same duty cycle, both can realize more the output voltage of hypermutation ratio, can effectively reduce the voltage stress of switching tube again.
3) converter of the present invention also can adopt staggered phase shifting control switching tube (Q1) with (Q2) time, and control method is simple, is easy to realization.Compare with two staggered parallelly connected BOOST converters with traditional BOOST converter, converter of the present invention both can realize more the output voltage of hypermutation ratio, can effectively reduce the voltage stress of switching tube again.
Converter of the present invention has the high no-load voltage ratio of boosting, the control method simple and flexible, and good characteristics such as the voltage stress of switching tube is low are very suitable for photovoltaic generation from now on, and occasions such as fuel cell power generation are used, and have to use preferably and promotion prospect.
Technical scheme
The present invention realizes through following technical scheme:
Shown in accompanying drawing 1; Hypermutation of the present invention compares DC-DC voltage boosting converter; Comprise a direct-current input power supplying (Vin); Two boost inductance (L1; L2); Two power switch pipe (Q1; Q2); Three unidirectional rectifier diode (D1; D2; D3); Two intermediate energy storage electric capacity (C1; C2); An output filter capacitor (C3); Filter capacitor (C3) two ends are output; Filter capacitor (C3) two termination loads; Concrete connected mode is: the positive pole of direct-current input power supplying (Vin) respectively with inductance (L1; L2) connect; The other end of inductance (L1) links to each other with the drain electrode of switching tube (Q1) and the anode of diode (D1) respectively; The other end of inductance (L2) links to each other with the drain electrode of switching tube (Q2) and an end of intermediate energy storage electric capacity (C1) respectively; (C1) the other end is connected to the negative electrode of diode (D1); Anode with diode (D2) links to each other again; The negative electrode of diode (D2) is connected with the anode of diode (D3); One end of output filter capacitor (C3) is connected to the negative electrode of diode (D3); The other end of filter capacitor (C3) links to each other with the negative pole of direct-current input power supplying (Vin); Draw the load of output termination from the two ends of (C3); The source electrode of switching tube (Q1) and (Q2) is connected with the negative pole of direct-current input power supplying (Vin) simultaneously, and storage capacitor (C2) across is at the anode of diode (D1) and negative electrode (D2).
The present invention at continuous state or critical continuous state, and when adopting complementary control method, can be divided into two kinds of operation modes at input inductance (L1), (L2) current work, carries out labor and explanation in the face of two kinds of operation modes of the present invention down:
Operation mode 1 shown in accompanying drawing 2, power switch pipe (Q1) conducting, power switch pipe (Q2) turn-offs, this moment, diode (D1), (D3) ended diode (D2) conducting.Input supply voltage directly is added on the inductance (L1), inductive current i L1Linear increase.Inductance (L2) and input power supply, intermediate energy storage electric capacity (C1), diode (D2), intermediate energy storage electric capacity (C2), the power switch pipe (Q1) through conducting constitute the loop, flow through the current i of inductance (L2) this moment L2Linear reducing, intermediate energy storage electric capacity (C1) discharge, intermediate energy storage electric capacity (C2) charging.
Operation mode 2 is shown in accompanying drawing 3, and power switch pipe (Q1) turn-offs, power switch pipe (Q2) conducting, and diode (D1), (D3) conducting at this moment, diode (D2) ends.Input supply voltage directly is added on the inductance (L2), inductive current i L2Linear increase.Inductance (L1) and input power supply pass through diode (D1) together to intermediate energy storage electric capacity (C1) charging, while inductance (L1) and input power supply, and intermediate energy storage electric capacity (C2) provides ability energy, current i through diode (D3) to output together L1Linear reducing.
Beneficial effect:
Compared with prior art the present invention has following beneficial effect: converter of the present invention has the higher no-load voltage ratio of boosting; Can effectively reduce simultaneously the voltage stress of power switch pipe; The ripple of input current and output voltage also can be effectively controlled, and the realization of control circuit is simple.Converter of the present invention both can be used as general DC-DC converter and had used, and can be used for the independent generating or the grid-connected system of solar-energy photo-voltaic cell and fuel cell again.
Description of drawings
Fig. 1 is the topology diagram of hypermutation of the present invention than DC-DC voltage boosting converter.
Fig. 2 is the equivalent circuit diagram of hypermutation of the present invention than DC-DC voltage boosting converter operation mode 1.
Fig. 3 is the equivalent circuit diagram of hypermutation of the present invention than DC-DC voltage boosting converter operation mode 2.
Fig. 4 is the emulation experiment oscillogram of hypermutation of the present invention each power tube voltage stress during than the DC-DC voltage boosting converter steady operation, VD1 wherein, and VD2, VD3 is corresponding diode D1 respectively, D2, the voltage stress of D3; VQ1, VQ2 is corresponding switching tube Q1 respectively, the voltage stress waveform of Q2.
Fig. 5 is hypermutation of the present invention DC source output current during than the DC-DC voltage boosting converter steady operation; Each inductive current; The emulation experiment oscillogram of input and output voltage; Wherein i is the output current that the input DC source provides; IL1, iL2 flow through inductance L 1, the electric current of L2; Vin, corresponding input voltage of Vo and output voltage.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail: present embodiment provided execution mode and operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
Two input inductances (L1) of present embodiment, (L2) work under the continuous or critical condition at electric current; Converter of the present invention has two kinds of operation modes when adopting complementary control; Two kinds of operation modes in the face of present embodiment carry out labor, further the derive output of converter of the present invention when complementary control method and the no-load voltage ratio of input voltage down.
Below in the explanation, T is the switch periods of switching tube (Q1), (Q2), and Ton is time, the T of switching tube (Q1) conducting in each switch periods OffThe time, the D that in each switch periods, turn-off for switching tube (Q1) are the conducting duty ratio of power switch pipe (Q1), wherein T On=DT, T Off=(1-D) T, T On+ T Off=T and since the power switch pipe (Q1) of converter of the present invention with (Q2) be operated in complete complementary state, so switching tube (Q1) in each switch periods during conducting, switching tube (Q2) turn-offs; When switching tube (Q1) turn-offs in each switch periods, switching tube (Q2) conducting;
Operation mode 1: this mode shown in accompanying drawing 2, power switch pipe (Q1) conducting, power switch pipe (Q2) turn-offs, this moment, diode (D1), (D3) ended diode (D2) conducting.Input supply voltage directly is added on the inductance (L1), inductive current i L1Linear increase.Inductance (L2) and input power supply, intermediate energy storage electric capacity (C1), diode (D2), intermediate energy storage electric capacity (C2), the power switch pipe (Q1) through conducting constitute the loop, the current i of inductance this moment (L2) L2Linear reducing, intermediate energy storage electric capacity (C1) discharge, intermediate energy storage electric capacity (C2) charging.Dynamic characteristic equation under this mode does
L 1 di L 1 dt = V in L 2 di L 2 dt = V in - ( V c 2 - V c 1 ) - - - ( 1 )
(Q1) pipe is through ON time T OnAfter, i L1The linear maximum that is increased to, therefore in power switch pipe (Q1) conduction period, i L1Increment Delta i L1 +For:
Δi L 1 + = V in L 1 DT - - - ( 2 )
Inductance under this mode (L2) and input power supply charge current i together to intermediate energy storage electric capacity (C2) through diode (D2) L2Linear reducing, i L2Reduction Δ i L2 -For:
Δi L 2 - = ( V c 2 - V c 1 - V in ) DT L 2 - - - ( 3 )
Operation mode 2: this mode is shown in accompanying drawing 3, and power switch pipe (Q1) turn-offs, power switch pipe (Q2) conducting, and diode (D1), (D3) conducting at this moment, diode (D2) ends.Input supply voltage directly is added on the inductance (L2), inductive current i L2Linear increase, inductance under this mode (L1) and input power supply charge to intermediate energy storage electric capacity (C1) through diode (D1) together, while inductance (L1) and input power supply, and intermediate energy storage electric capacity (C2) provides energy through diode (D3) to output together.Current i L1Linear reducing, its dynamic characteristic equation is:
L 1 di L 1 dt = V in - V c 1 = V in - ( V o - V c 2 ) L 2 di L 2 dt = V in - - - ( 4 )
Owing to (Q2) and (Q1) be operated in complete complementary state, so (Q2) Guan ON time equals the turn-off time T that (Q1) manages Off, elapsed time T OffAfter, i L2The linear maximum that is increased to, i L1The linear minimum value that is reduced to, therefore in power switch pipe (Q2) conduction period, i L1Reduction Δ i L1 -And i L2Recruitment Δ i L2 +Be respectively:
Δi L 1 - = ( V c 1 - V in ) ( 1 - D ) T L 1 = ( V o - V c 2 - V in ) ( 1 - D ) T L 1 - - - ( 5 )
Δi L 2 + = V in L 2 ( 1 - D ) T - - - ( 6 )
When the circuit cycles steady operation is between mode 1 and mode 2, inductive current i L1With inductive current i L2Variable quantity in each switch periods, satisfy formula (7) and (8):
Δi L1 +=Δi L1 - (7)
Δi L2 +=Δi L2 - (8)
Can release the output voltage of converter of the present invention and the no-load voltage ratio of input voltage is by equation (1-8):
V o V in = 1 + D D ( 1 - D ) , And D<1 (9)
Compare with traditional BOOST; The no-load voltage ratio of boosting of converter of the present invention obviously can be improved; And the power switch pipe voltage stress of converter of the present invention is little, and input current ripple and output voltage ripple also can effectively be reduced, and helps improving the efficient of converter.
In the embodiments of the invention; Input voltage vin=48V; Output voltage V o=320V; Inductance L 1=L2=0.5mH, C1=C2=47uF/400V, power switch pipe Q1; Q2 STY60NM60; Diode D1, D2, D3 RHRG5060, switching frequency fs=20KHz attaches the concrete emulation experiment waveform of Figure 4 and 5 for this embodiment.
The simulation experiment result and theory analysis are in full accord; Feasibility and the validity of hypermutation of the present invention than DC-DC voltage boosting converter and controlling schemes thereof has been described; Hypermutation of the present invention is than the existing higher no-load voltage ratio of boosting of DC-DC voltage boosting converter; Can effectively reduce the voltage stress of switching tube again; Reducing the ripple of input current and output voltage, is a kind of DC-DC voltage boosting converter of superior performance.

Claims (4)

1. a hypermutation is more topological than DC-DC voltage boosting converter; Comprise a direct-current input power supplying (Vin); Two boost inductance (L1; L2); Two power switch pipe (Q1; Q2); Three unidirectional rectifier diode (D1; D2; D3); Two intermediate energy storage electric capacity (C1; C2); An output filter capacitor (C3); Filter capacitor (C3) voltage is (Vo); (C3) two ends connect load; Concrete connected mode is: the positive pole of direct-current input power supplying (Vin) respectively with inductance (L1; L2) connect; The other end of inductance (L1) links to each other with the drain electrode of switching tube (Q1) and the anode of diode (D1) respectively; The other end of inductance (L2) links to each other with the drain electrode of switching tube (Q2) and an end of intermediate energy storage electric capacity (C1) respectively; (C1) the other end is connected to the negative electrode of diode (D1); Anode with diode (D2) links to each other again; The negative electrode of diode (D2) is connected with the anode of diode (D3); One end of output filter capacitor (C3) is connected to the negative electrode of diode (D3); The other end of filter capacitor (C3) links to each other with the negative pole of direct-current input power supplying (Vin); Draw the load of output termination from the two ends of (C3); The source electrode of switching tube (Q1) and (Q2) is connected with the negative pole of direct-current input power supplying (Vin) simultaneously, and storage capacitor (C2) across is at the anode tap of diode (D1) and cathode terminal (D2).
2. converter according to claim 1; It is characterized in that an end of intermediate energy storage electric capacity (C1) is connected to the drain electrode of switching tube (Q2); The other end is connected to the negative electrode of diode (D1) and anode (D2); One end of intermediate energy storage electric capacity (C2) is connected to the drain electrode of the anode and the switching tube (Q1) of diode (D1), and the other end is connected to the negative electrode of diode (D2) and the anode of diode (D3).
3. according to claim 1,2 described converters; The anode that it is characterized in that diode (D1) links to each other with the drain electrode of switching tube (Q1); (D1) negative electrode links to each other with the anode of diode (D2) respectively; Be connected with an end of storage capacitor (C1); The negative electrode of diode (D2) links to each other with the anode of diode (D3) respectively, is connected with an end of storage capacitor (C2).
4 according to claims 1 wherein the transducer, characterized in that: When two complementary control switch, the output voltage and the relationship between the input voltage: and D for the switch (Q1) the conduction duty cycle.
CN2011103221784A 2011-10-21 2011-10-21 High transformation ratio DC (direct current)-DC boost converter Pending CN102355128A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103929058A (en) * 2014-04-24 2014-07-16 安徽工业大学 Two-phase interleaved converter based on coupled inductors
WO2014139206A1 (en) * 2013-03-11 2014-09-18 京东方科技集团股份有限公司 Boost circuit and drive method therefor, backlight module and display device
CN104836433A (en) * 2015-06-08 2015-08-12 国家电网公司 DC-DC boost system, photovoltaic system and cell drive device
CN106533173A (en) * 2016-12-29 2017-03-22 三峡大学 High-gain DC/DC converter with adjustable input phase number

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US20070216390A1 (en) * 2006-03-17 2007-09-20 Yuan Ze University High-efficiency high-voltage difference ratio bi-directional converter

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014139206A1 (en) * 2013-03-11 2014-09-18 京东方科技集团股份有限公司 Boost circuit and drive method therefor, backlight module and display device
CN103929058A (en) * 2014-04-24 2014-07-16 安徽工业大学 Two-phase interleaved converter based on coupled inductors
CN104836433A (en) * 2015-06-08 2015-08-12 国家电网公司 DC-DC boost system, photovoltaic system and cell drive device
CN106533173A (en) * 2016-12-29 2017-03-22 三峡大学 High-gain DC/DC converter with adjustable input phase number
CN106533173B (en) * 2016-12-29 2020-10-23 三峡大学 High-gain DC/DC converter with adjustable input phase number

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