CN204068702U - A kind of non-isolation type high-gain DC/DC converter - Google Patents

A kind of non-isolation type high-gain DC/DC converter Download PDF

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Publication number
CN204068702U
CN204068702U CN201420557975.XU CN201420557975U CN204068702U CN 204068702 U CN204068702 U CN 204068702U CN 201420557975 U CN201420557975 U CN 201420557975U CN 204068702 U CN204068702 U CN 204068702U
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China
Prior art keywords
diode
power switch
inductance
electric capacity
converter
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Expired - Fee Related
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CN201420557975.XU
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邾玢鑫
任路路
潘海龙
佘小莉
黄悦华
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China Three Gorges University CTGU
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China Three Gorges University CTGU
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Abstract

A kind of non-isolation type high-gain DC/DC converter, comprises inductance L 1, L 2, power switch S 1, S 2, diode D 1, D 2, D 3, D 4, electric capacity C 1, C 2, C 3, C 4; First inductance L 1one end, the second inductance L 2one end meet input power u simultaneously inpositive pole, the first inductance L 1the other end, the second inductance L 2the other end meet the first power switch S respectively 1drain electrode, the second power switch S 2drain electrode; First power switch S 1source electrode, the second power switch S 2source electrode meet input power u innegative pole; First power switch S 1, the second power switch S 2grid connect respective controller respectively.A kind of non-isolation type high-gain DC/DC of the utility model converter, compared with existing high-gain boost converter, not containing transformer and coupling inductance, EMI characteristic is good, and circuit topology is simple, Control System Design and to realize difficulty all lower.

Description

A kind of non-isolation type high-gain DC/DC converter
Technical field
The utility model relates to a kind of DC-DC converter, is a kind of non-isolation type high-gain DC/DC converter specifically.
Background technology
In the prior art, basic two-phase booster type (Boost) interleaved parallel converter, see the accompanying drawing 1 in Figure of description, comprises two inductance L 1, L 2, two power switch tube S 1, S 2, two output diode D 1, D 2.Wherein, first inductance L 1input and second inductance L 2input connect input power V together inpositive pole, output V inmeet first output diode D 1anode, first diode D 1negative electrode and second diode D 2negative electrode meet converter output terminal V together oUTpositive pole; In the first inductance L 1with first diode D 1the indirect first power switch S of anode 1drain electrode, the first power switch S 1source electrode connects the negative pole of converter; Second inductance L 2output termination second output diode D 2anode, in the second inductance L 2with second diode D 2the indirect second power switch S of anode 2drain electrode, the second power switch source S 2pole connects the negative pole of converter.The gain of this converter input and output voltage is less, and power switch tube S 1, S 2with diode D 1, D 2voltage stress be output voltage, voltage stress is high, and loss is larger.And in the larger occasion of some input and output voltages difference, its input and output boost capability is difficult to meet the demands, as: photovoltaic cell is grid-connected, X-ray machine power supply etc.
At present, realize high-gain conversion and usually have three kinds of modes: 1., by means of transformer: the transformer adding a high frequency in the middle of original DC-DC converter, the object of high gain boost is realized by changing transformer voltage ratio, but program conversion process of energy is complicated, and the energy conversion efficiency of whole system is low.2., utilize switching capacity: needed for this kind of scheme, switching device is many, and control and drive circuit realization complexity.3. utilize coupling inductance: the use of coupling inductance, switching device voltage stress often can be caused too high, and can the impacts such as electromagnetic interference be brought.
Summary of the invention
For prior art above shortcomings, there is boost capability not for solving existing booster converter, the problems such as operating efficiency and power density are not high, the utility model provides a kind of non-isolation type direct-current-DC converter possessing high-gain ability.
The technical scheme that the utility model is taked is:
A kind of non-isolation type high-gain DC/DC converter, comprises inductance L 1, L 2, power switch S 1, S 2, diode D 1, D 2, D 3, D 4, electric capacity C 1, C 2, C 3, C 4; First inductance L 1one end, the second inductance L 2one end meet input power u simultaneously inpositive pole, the first inductance L 1the other end, the second inductance L 2the other end meet the first power switch S respectively 1drain electrode, the second power switch S 2drain electrode; First power switch S 1source electrode, the second power switch S 2source electrode meet input power u innegative pole; First power switch S 1, the second power switch S 2grid connect respective controller respectively; Diode D 1, D 2series connection, diode D 3, D 4series connection, wherein diode D 1negative electrode and diode D 2anode be connected, diode D 3negative electrode and diode D 4anode be connected; Electric capacity C 1, C 2series connection, electric capacity C 3, C 4series connection, wherein electric capacity C 1, C 3be positioned at top, electric capacity C 2, C 4be positioned at below; Electric capacity C 1upper end and diode D 1, D 2the node of series connection is connected, electric capacity C 2upper end and diode D 3, D 4the node of series connection is connected; Electric capacity C 3upper end and diode D 2negative electrode be connected, and as output u opositive pole, electric capacity C 4lower end and diode D 3anode be connected, and as output u onegative pole; First inductance L simultaneously 1the other end also meet diode D 1anode and electric capacity C 3, C 4the node of series connection, the second inductance L 2the other end also meet electric capacity C 1, C 2the node of series connection; Diode D 4negative electrode and input power u innegative pole be connected.
First power switch S 1, the second power switch S 2, its control mode is that each phase power switch adopts Interleaved control strategy, that is: difference 180 between every phase switch drive phase place o.
Compared to existing technology, a kind of non-isolation type high-gain DC/DC of the utility model converter, has following beneficial effect:
1), the utility model utilizes four diodes and four electric capacity composition high gain boost networks, achieves the input and output voltage gain being four times in basic Boost converter.
2), the voltage stress of circuit breaker in middle device is low, and wherein the voltage stress of switching tube is only 1/4th of basic Boost converter.
3), compared with existing high-gain boost converter, not containing transformer and coupling inductance, EMI characteristic is good, and circuit topology is simple, Control System Design and to realize difficulty all lower.
Accompanying drawing explanation
Fig. 1 is the booster type of two-phase described in this background technology (Boost) interleaved parallel converter circuit theory diagrams.
Fig. 2 is the utility model circuit theory diagrams.
Embodiment
As shown in Figure 2, a kind of non-isolation type high-gain DC/DC converter, is made up of low pressure input power and DC/DC booster circuit; This converter comprises two inductance L 1, L 2, two power switch S 1, S 2, four diode D 1, D 2, D 3, D 4with four electric capacity C 1, C 2, C 3, C 4.
First inductance L 1one end, the second inductance L 2one end meet input power u simultaneously inpositive pole, the first inductance L 1the other end, the second inductance L 2the other end meet the first power switch S respectively 1drain electrode, the second power switch S 2drain electrode; First power switch S 1source electrode, the second power switch S 2source electrode meet input power u innegative pole; Two power switch S 1, S 2grid connect respective controller respectively.
Diode D 1, D 2series connection, D 3, D 4series connection, wherein diode D 1negative electrode and diode D 2anode be connected, diode D 3negative electrode and diode D 4anode be connected; Electric capacity C 1, C 2series connection, C 3, C 4series connection, wherein electric capacity C 1, C 3be positioned at top, electric capacity C 2, C 4be positioned at below; Electric capacity C 1upper end and diode D 1, D 2the node of series connection is connected, electric capacity C 2upper end and diode D 3, D 4the node of series connection is connected; Electric capacity C 3upper end and diode D 2negative electrode be connected, and as output u opositive pole, electric capacity C 4lower end and diode D 3anode be connected, and as output u onegative pole;
First inductance L simultaneously 1the other end also meet diode D 1anode and electric capacity C 3, C 4the node of series connection, the second inductance L 2the other end also meet electric capacity C 1, C 2the node of series connection; Diode D 4negative electrode and input power u innegative pole be connected.
Power switch S 1, S 2grid connect respective controller respectively.
Described non-isolation type high-gain DC/DC converter, has the ratio of gains of 4 times compared to traditional Boost converter.This converter input connects power voltage supply module (as photovoltaic cell, fuel cell etc.), and output voltage is controlled high voltage direct current.
According to the difference of power switch state, circuit can be divided into 3 kinds of operating states:
(1), controller controls power switch S 1turn off, power switch S 2conducting, now inductance L 1an electric current part by diode D 1, switch S 2and low pressure input power is to electric capacity C 1charging, another part is by diode D 3, electric capacity C 2, switch S 2and low-tension supply is to electric capacity C 4charging, this process mesolow input power, inductance L 1, electric capacity C 2all be in discharge condition, electric capacity C 1, C 4be in charged state; Now power switch S 2keep opening state, low-tension supply is by power switch S 2to inductance L 2charging; Diode D 2, D 4all turn off.
(2), controller controls power switch S 2turn off, power switch S 1conducting, now inductance L 2an electric current part by diode D 4and low pressure input power is to electric capacity C 2charging, another part is by electric capacity C 1, diode D 2, switch S 1and low-tension supply is to electric capacity C 3charging, this process mesolow input power, inductance L 2, electric capacity C 1all be in discharge condition, electric capacity C 2, C 3be in charged state; Now power switch S 1keep opening state, low-tension supply is by power switch S 1to inductance L 1charging; Diode D 1, D 3all turn off.
(3), the equal conducting of power switch, now low-tension supply is by power switch S 1with power switch S 2respectively to inductance L 1and inductance L 2charging; Diode D 1, D 2, D 3, D 4all turn off.
In above-mentioned three courses of work, by electric capacity C 3, C 4power to the load.
In embodiment of the present utility model, power switch selects the switching device of different voltage stress according to the output voltage in real system, compare traditional scheme and have the low feature of voltage stress.
The power switch that the utility model uses is switching device, the open and close of power switch are under control of the controller, above-mentioned have 4 times to the DC converter of traditional B oost converter boost ability, controlled the duty ratio often phase 180 ° between phase of two-phase power switch by controller, its each phase duty ratio size determines according to input/output relation.
In sum, this circuit topological structure is simple, and boost capability is strong, is applicable to being applied to the larger application scenario of some input and output voltage differences.Diode between Fig. 2 breaker in middle pipe drain-source pole is the body diode that switching tube carries, then this is only the example of a metal-oxide-semiconductor.Also other wholly-controled device can be selected.
Above-mentioned enforcement example of the present utility model is only for the utility model example is described, and is not the restriction to execution mode of the present utility model.For those of ordinary skill in the field, other multi-form change and variations can also be made on the basis of the above description.Here cannot give exhaustive to all execution modes.Every belong to the technical solution of the utility model the apparent change of amplifying out or variation be still in the row of protection range of the present utility model.

Claims (2)

1. a non-isolation type high-gain DC/DC converter, comprises inductance L 1, L 2, power switch S 1, S 2, diode D 1, D 2, D 3, D 4, electric capacity C 1, C 2, C 3, C 4; It is characterized in that, the first inductance L 1one end, the second inductance L 2one end meet input power u simultaneously inpositive pole, the first inductance L 1the other end, the second inductance L 2the other end meet the first power switch S respectively 1drain electrode, the second power switch S 2drain electrode;
First power switch S 1source electrode, the second power switch S 2source electrode meet input power u innegative pole;
First power switch S 1, the second power switch S 2grid connect respective controller respectively;
Diode D 1, D 2series connection, diode D 3, D 4series connection, wherein diode D 1negative electrode and diode D 2anode be connected, diode D 3negative electrode and diode D 4anode be connected;
Electric capacity C 1, C 2series connection, electric capacity C 3, C 4series connection, wherein electric capacity C 1, C 3be positioned at top, electric capacity C 2, C 4be positioned at below; Electric capacity C 1upper end and diode D 1, D 2the node of series connection is connected, electric capacity C 2upper end and diode D 3, D 4the node of series connection is connected; Electric capacity C 3upper end and diode D 2negative electrode be connected, and as output u opositive pole, electric capacity C 4lower end and diode D 3anode be connected, and as output u onegative pole;
First inductance L simultaneously 1the other end also meet diode D 1anode and electric capacity C 3, C 4the node of series connection, the second inductance L 2the other end also meet electric capacity C 1, C 2the node of series connection; Diode D 4negative electrode and input power u innegative pole be connected.
2. a kind of non-isolation type high-gain DC/DC converter according to claim 1, is characterized in that, the first power switch S 1, the second power switch S 2, its control mode is that each phase power switch adopts Interleaved control strategy, that is: difference 180 between every phase switch drive phase place o.
CN201420557975.XU 2014-09-26 2014-09-26 A kind of non-isolation type high-gain DC/DC converter Expired - Fee Related CN204068702U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104218801A (en) * 2014-09-26 2014-12-17 三峡大学 Non-isolated high-gain DC/DC convertor
CN106712499A (en) * 2016-12-13 2017-05-24 西安空间无线电技术研究所 Novel low-electrical-stress single tube control buck-boost converter
EP3503370A1 (en) * 2017-12-20 2019-06-26 Analog Devices Global Unlimited Company Interleaved boost converter with holdup time extension

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104218801A (en) * 2014-09-26 2014-12-17 三峡大学 Non-isolated high-gain DC/DC convertor
CN106712499A (en) * 2016-12-13 2017-05-24 西安空间无线电技术研究所 Novel low-electrical-stress single tube control buck-boost converter
CN106712499B (en) * 2016-12-13 2018-12-21 西安空间无线电技术研究所 A kind of low electric stress one-switch control buck-boost converter
EP3503370A1 (en) * 2017-12-20 2019-06-26 Analog Devices Global Unlimited Company Interleaved boost converter with holdup time extension
US10367411B2 (en) 2017-12-20 2019-07-30 Analog Devices Global Unlimited Company Interleaved boost converter with holdup time extension
TWI702784B (en) * 2017-12-20 2020-08-21 百慕達商亞德諾半導體環球無限公司 Power factor correction device, system configured to provide tolerance to fault condition in an input supply, and method for operating power factor correction device

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