CN102158090A - Boost converter with built-in transformer and voltage-doubling unit of switching capacitor - Google Patents

Boost converter with built-in transformer and voltage-doubling unit of switching capacitor Download PDF

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Publication number
CN102158090A
CN102158090A CN2011100525010A CN201110052501A CN102158090A CN 102158090 A CN102158090 A CN 102158090A CN 2011100525010 A CN2011100525010 A CN 2011100525010A CN 201110052501 A CN201110052501 A CN 201110052501A CN 102158090 A CN102158090 A CN 102158090A
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China
Prior art keywords
transformer
built
diode
clamping
capacitance
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CN2011100525010A
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Chinese (zh)
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何湘宁
李武华
荣强
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Zhejiang University ZJU
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Zhejiang University ZJU
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Priority to CN2011100525010A priority Critical patent/CN102158090A/en
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Abstract

The invention discloses a Boost converter with a built-in transformer and a voltage-doubling unit of a switching capacitor, which comprises a power switching tube, an input filtering inductor, a blocking capacitor, a clamping diode, a clamping capacitor, a fly-wheel diode, the switching capacitor, an output diode, an output capacitor and a built-in transformer with two windings. The leakage inductance of the built-in transformer is utilized for realizing zero-current switching-on of the power switching tube and eliminating the backward recovery problem of the output diode and the clamping diode, a passive clamping circuit comprising the clamping diode and the clamping capacitor is utilized for realizing soft switching-off of the power switching tube and non-loss transfer of leakage inductance energy, the leakage inductance and resonance of the blocking capacitor are utilized for eliminating the backward recovery problem of the fly-wheel diode, the voltage-doubling unit comprising the built-in transformer and the blocking capacitor is utilized for realizing high-gain output of the converter and reducing the voltage stress of a power device, an additional power switch is not required, no energy loss elements exist in a circuit, and the structure is simple.

Description

The Boost converter of the multiplication of voltage unit of built-in transformer and switching capacity
Technical field
The present invention relates to a kind of DC-DC converter.Be the Boost converter of the multiplication of voltage unit of built-in transformer and switching capacity specifically.
Background technology
Conventional booster type (Boost) DC-DC converter is simple in structure, be widely used, but the power switch of this converter works in the hard switching state, switching loss is bigger, the voltage stress of power switch pipe is bigger, and the reverse-recovery problems of output diode is serious, and under the application scenario of high-gain, need high duty cycle of switching, this point is difficult to be realized.In recent years, studied the high-gain Boost converter that some adopt the tandem tap capacitor cells in succession, the high-gain conversion could be realized in need connect a plurality of switching capacities unit of this method, and circuit is complexity, it is serious that fly-wheel diode oppositely recovers, and output current ripple is big.
Summary of the invention
The purpose of this invention is to provide the output voltage gain height, the input current ripple is little, and output current ripple is little, and is simple in structure, and the diode direction is recovered the Boost converter of the multiplication of voltage unit of little built-in transformer of problem and switching capacity.
Technical solution of the present invention is: the Boost converter of the multiplication of voltage unit of built-in transformer and switching capacity, comprise a power switch pipe, an input filter inductance, a capacitance, a clamping diode, a clamping capacitance, a fly-wheel diode, a switching capacity, an output diode, an output capacitance and a built-in transformer, built-in transformer has two windings, one end of input filter inductance links to each other with the anode of power supply, one end of one end of the source electrode of the input other end of filter inductance and power switch pipe and the anode of clamping diode and capacitance and second winding of built-in transformer links to each other, the other end of capacitance links to each other with an end of first winding of built-in transformer, the negative electrode of clamping diode links to each other with an end of clamping capacitance and the anode of fly-wheel diode, the other end of second winding of built-in transformer links to each other with an end of switching capacity, the other end of switching capacity links to each other with the anode of the negative electrode of fly-wheel diode and output diode, the negative electrode of output diode links to each other with an end of output capacitance, and the other end of first winding of the drain electrode of power switch pipe and built-in transformer links to each other with the negative terminal of the other end of clamping capacitance and power supply and the other end of output capacitance.The link of the link of first winding of above-mentioned built-in transformer and an end of capacitance and second winding of built-in transformer and switching capacity is the end of the same name of built-in transformer.
During work, utilize the leakage inductance of built-in transformer to realize the zero current turning-on of power switch pipe and the soft shutoff of output diode and clamping diode; When power switch pipe turn-offs, because the existence of clamping diode and clamping capacitance has realized that the soft clamping of power switch pipe turn-offs; When power switch pipe was opened, the resonance of built-in transformer leakage inductance and capacitance had been realized the soft shutoff of fly-wheel diode.Utilize the high-gain output of first, second winding realization converter of built-in transformer, utilize switching capacity further to improve the voltage gain of converter and the voltage stress of reduction power device, simultaneously, each switch periods clamping capacitance is collected the leakage inductance energy of built-in transformer, and finally transfer to load, realized the harmless operation of passive clamp circuit.
The Boost converter of the multiplication of voltage unit of built-in transformer of the present invention and switching capacity, utilize the input filter inductance to reduce the ripple of input current, utilize the leakage inductance of built-in transformer to realize the zero current turning-on of power switch pipe and the soft shutoff of output diode and clamping diode, the passive clamp circuit that utilizes clamping diode and clamping capacitance to form has been realized the soft shutoff of power switch pipe and the harmless transfer of leakage inductance energy, clamping diode is not connected on the loop of power circuit, can reduce conduction loss, utilize first of built-in transformer, second winding is realized the high-gain output of converter, utilize switching capacity further to improve the voltage gain of converter and the voltage stress of reduction power device, need not extra power switch and inductance element, attachment element is few, simple in structure, control is convenient, noenergy losser in the circuit, improved the efficient of converter, in the commutation course, the overshoot of switching device no-voltage.
Description of drawings
Fig. 1 is the circuit diagram of Boost converter of the multiplication of voltage unit of built-in transformer and switching capacity;
Fig. 2 is Fig. 1 converter course of work oscillogram.
Embodiment
Referring to Fig. 1, the Boost converter of the multiplication of voltage unit of built-in transformer of the present invention and switching capacity comprises two power switch pipes S, an input filter inductance L f , a capacitance C b , a clamping diode D M1 , a clamping capacitance C M1 , a fly-wheel diode D M2 , a switching capacity C M2 , an output diode D o , an output capacitance C o With a built-in transformer, built-in transformer has two windings L a , L b , the input filter inductance L f An end and power supply V In Anode link to each other the input filter inductance L f The other end and power switch pipe SSource electrode and clamping diode D M1 Anode and capacitance C b An end and second winding of built-in transformer L b An end link to each other capacitance C b The other end and first winding of built-in transformer L a An end link to each other clamping diode D M1 Negative electrode and clamping capacitance C M1 An end and fly-wheel diode D M2 Anode link to each other second winding of built-in transformer L b The other end and switching capacity C M2 An end link to each other switching capacity C M2 The other end and fly-wheel diode D M2 Negative electrode and output diode D o Anode link to each other output diode D o Negative electrode and output capacitance C o An end link to each other power switch pipe SDrain electrode and first winding of built-in transformer L a The other end and clamping capacitance C M1 The other end and power supply V In Negative terminal and output capacitance C o The other end link to each other.First winding of above-mentioned built-in transformer L a With capacitance C b The link of an end and second winding of built-in transformer L b With switching capacity C M2 Link be the end of the same name of built-in transformer.
The passive-clamp Boost converter of the multiplication of voltage unit of built-in transformer and switching capacity exists five kinds of courses of work, i.e. fly-wheel diodes D M2 Turn off process; Power switch pipe STurn-off and clamping diode D M1 And output diode D o The change of current between opening; Clamping diode D M1 Turn off process; Power switch pipe STurn on process; Output diode D o Shutoff, fly-wheel diode D M2 Opening process.Commutation course is analyzed as follows
Fly-wheel diode D M2 Turn off process:
Before the change of current, circuit is in power switch pipe SConducting, clamping diode D M1 Turn-off fly-wheel diode D M2 Conducting, output diode D o Turn-off built-in transformer leakage inductance and capacitance C b The operating state of resonance.When resonance current resonance arrives zero, fly-wheel diode D M2 Turn-off, flow through filter inductance L f Electric current rise so that less slope is linear, store energy is at filter inductance L f On.
Power switch pipe STurn-off and clamping diode D M1 And output diode D o The change of current between opening:
Power switch pipe SDuring shutoff, power switch pipe SLast voltage rises rapidly, clamping diode D M1 The voltage at two ends is dropped rapidly to zero, clamping diode D M1 Open-minded, because clamping capacitance C M1 Effect, power switch pipe SThe voltage at two ends is certain voltage value by clamp, has realized power switch pipe SSoft clamping turn-off.Simultaneously, built-in transformer first winding L a With second winding L b The voltage at two ends rises rapidly, output diode D o The voltage at two ends quickly falls to zero, output diode D o Conducting is stored in filter inductance L f And switching capacity C M2 Last energy to capacitance C b And load transfer.
Clamping diode D M1 Turn off process:
Output diode D o After opening, flow through capacitance C b And switching capacity C M2 Electric current rise with certain slope, and flow through clamping diode D M1 Electric current descend with certain slope from certain value, when flowing through clamping diode D M1 Electric current when dropping to zero, clamping diode D M1 Turn-off.Circuit ingoing power switching tube STurn-off clamping diode D M1 , fly-wheel diode D M2 Turn-off and output diode D o The operating state of conducting is stored in filter inductance L f And switching capacity C M2 Last energy continue to capacitance C b And load transfer.
Power switch pipe STurn on process:
Power switch pipe SGate signal provide power switch pipe SElectric current rise from zero so that certain slope is linear, realized power switch pipe SZero current turning-on, output diode D o Electric current descend so that certain slope is linear, work as output diode D o Electric current when dropping to zero, output diode D o Turn-off, realized output diode D o Turn-off and power switch pipe SThe change of current between opening has reduced output diode D o Reverse recovery current, reduced output diode D o The reverse recovery loss that causes.Flow through filter inductance L f Electric current rise so that less slope is linear, store energy is at filter inductance L f On.
Output diode D o Shutoff, fly-wheel diode D M2 Opening process:
Output diode D o Have no progeny in the pass, the leakage inductance of built-in transformer and capacitance C b The beginning resonant process.Energy is from capacitance C b And clamping capacitance C M1 To switching capacity C M2 Shift.And flow through filter inductance L f Electric current continue to rise so that less slope is linear, store energy is at filter inductance L f On.
Fig. 2 is the portion waveshape figure in the circuit working process among Fig. 1, among the figure i Lf Be the input filter inductance L f In current waveform, i S Be power switch pipe SIn current waveform, v Cb Be capacitance C b Voltage waveform, i Lk Be the current waveform of built-in transformer leakage inductance, i Dm1 , v Dm1 Be respectively diode D M1 Electric current, voltage waveform, i Dm2 , v Dm2 The difference fly-wheel diode D M2 Electric current, voltage waveform, i Do Be output diode D o Current waveform; Among the figure t 0 Extremely t 5 Represent the time point in the switch periods, t 0 ~ t 1 It in time fly-wheel diode D M2 Turn off process, t 1 ~ t 2 It in time power switch pipe STurn-off and clamping diode D M1 And output diode D o Commutation course between opening, t 2 ~ t 3 It in time clamping diode D M1 Turn off process, t 3 ~ t 4 It in time power switch pipe STurn on process, t 4 ~ t 5 It in time output diode D o Shutoff, fly-wheel diode D M2 Opening process.

Claims (1)

1. the Boost converter of the multiplication of voltage unit of built-in transformer and switching capacity, comprise a power switch pipe (S), an input filter inductance (Lf), a capacitance (Cb), a clamping diode (Dm1), a clamping capacitance (Cm1), a fly-wheel diode (Dm2), a switching capacity (Cm2), an output diode (Do), an output capacitance (Co) and a built-in transformer, built-in transformer has two winding (La, Lb), one end of input filter inductance (Lf) links to each other with the anode of power supply (Vin), one end of second winding (Lb) of the anode of the other end of input filter inductance (Lf) and the source electrode of power switch pipe (S) and clamping diode (Dm1) and an end of capacitance (Cb) and built-in transformer links to each other, the other end of capacitance (Cb) links to each other with an end of first winding (La) of built-in transformer, the negative electrode of clamping diode (Dm1) links to each other with an end of clamping capacitance (Cm1) and the anode of fly-wheel diode (Dm2), the other end of second winding (Lb) of built-in transformer links to each other with an end of switching capacity (Cm2), the other end of switching capacity (Cm2) links to each other with the negative electrode of fly-wheel diode (Dm2) and the anode of output diode (Do), the negative electrode of output diode (Do) links to each other with an end of output capacitance (Co), the other end of first winding (La) of the drain electrode of power switch pipe (S) and built-in transformer links to each other with the negative terminal of the other end of clamping capacitance (Cm1) and power supply (Vin) and the other end of output capacitance (Co), and first winding (La) of above-mentioned built-in transformer is the end of the same name of built-in transformer with second winding (Lb) of the link of capacitance (Cb) and built-in transformer and the link of switching capacity (Cm2).
CN2011100525010A 2011-03-04 2011-03-04 Boost converter with built-in transformer and voltage-doubling unit of switching capacitor Pending CN102158090A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103618444A (en) * 2013-11-15 2014-03-05 南京航空航天大学 Three-winding coupling inductance ZVS/ZCS double-tube boost converter
CN103746564A (en) * 2013-12-30 2014-04-23 杭州科为达电气有限公司 High-gain active lossless clamping converter including built-in transformer and voltage-multiplying structure
CN104283419A (en) * 2014-07-29 2015-01-14 华南理工大学 Secondary type high-gain boosting converter with switched capacitors and coupled inductor
CN107070211A (en) * 2017-03-22 2017-08-18 华南理工大学 A kind of multi input high-gain Z source converters based on voltage doubling unit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1499703A (en) * 2002-11-08 2004-05-26 杭州千岛湖恒源电气有限公司 Soft switching circuit without absorption loss
JP2010115099A (en) * 2008-11-05 2010-05-20 Rintaro Miyake Boost chopper circuit
CN101867297A (en) * 2010-07-02 2010-10-20 杭州浙大太阳电气有限公司 Single-phase soft-switching and high-gain boost converter for distributed photovoltaic power generation
CN201699584U (en) * 2010-06-22 2011-01-05 上海寅稞电子科技有限公司 High efficiency step-up converter for solar distributed power generation
CN201985757U (en) * 2011-03-04 2011-09-21 浙江大学 Boost converter of voltage doubling unit of built-in transformer and switched capacitor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1499703A (en) * 2002-11-08 2004-05-26 杭州千岛湖恒源电气有限公司 Soft switching circuit without absorption loss
JP2010115099A (en) * 2008-11-05 2010-05-20 Rintaro Miyake Boost chopper circuit
CN201699584U (en) * 2010-06-22 2011-01-05 上海寅稞电子科技有限公司 High efficiency step-up converter for solar distributed power generation
CN101867297A (en) * 2010-07-02 2010-10-20 杭州浙大太阳电气有限公司 Single-phase soft-switching and high-gain boost converter for distributed photovoltaic power generation
CN201985757U (en) * 2011-03-04 2011-09-21 浙江大学 Boost converter of voltage doubling unit of built-in transformer and switched capacitor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103618444A (en) * 2013-11-15 2014-03-05 南京航空航天大学 Three-winding coupling inductance ZVS/ZCS double-tube boost converter
CN103618444B (en) * 2013-11-15 2017-01-04 南京航空航天大学 The two-tube booster converter of three winding coupling inductance ZVS/ZCS
CN103746564A (en) * 2013-12-30 2014-04-23 杭州科为达电气有限公司 High-gain active lossless clamping converter including built-in transformer and voltage-multiplying structure
CN104283419A (en) * 2014-07-29 2015-01-14 华南理工大学 Secondary type high-gain boosting converter with switched capacitors and coupled inductor
CN107070211A (en) * 2017-03-22 2017-08-18 华南理工大学 A kind of multi input high-gain Z source converters based on voltage doubling unit

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Application publication date: 20110817