CN104348361B - A kind of voltage raising and reducing converter - Google Patents
A kind of voltage raising and reducing converter Download PDFInfo
- Publication number
- CN104348361B CN104348361B CN201410613503.6A CN201410613503A CN104348361B CN 104348361 B CN104348361 B CN 104348361B CN 201410613503 A CN201410613503 A CN 201410613503A CN 104348361 B CN104348361 B CN 104348361B
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- negative pole
- power input
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- 230000000903 blocking effect Effects 0.000 claims abstract description 19
- 238000004146 energy storage Methods 0.000 claims abstract description 8
- 230000001939 inductive effect Effects 0.000 claims abstract description 5
- 230000005611 electricity Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000006837 decompression Effects 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention relates to a kind of voltage raising and reducing converter, including power input node, one inductance, one input capacitance and an output capacitance, the input capacitance is connected between power input node and ground, also include a first switch, one blocking element, output cathode node and output negative pole node, the inductance connection is between power input node and output cathode node, output capacitance is connected between output cathode node and output negative pole node, the first switch is connected between output cathode node and ground, the blocking element is connected between input power input node and output negative pole node, in the inductive energy storage, blocking is from the input node to the loop output negative pole node.The present invention realizes the effect of voltage raising and reducing using less switch, can not only reduce cost, while the conduction loss produced using switch is also reduced, so as to improve energy conversion efficiency.
Description
Technical field
The present invention relates to a kind of voltage boosting-reducing converter.
Background technology
In some applications, it usually needs a kind of electric pressure converter, the boosting to input power and drop can simultaneously be realized
Pressure function.One concrete instance is, three section lithium batteries are connected the power supply to be formed, and when lithium battery is full of, often economize on electricity pressure is 4.2V,
So it is 3~4.2V per batteries voltage range when with constantly electric discharge, its voltage can drop to 3V, three section series connection are then 9~
12.6V, i.e. input supply voltage change between 9V~12.6V；If load is 3 LEDs of series connection, leading per LEDs
The pressure that is powered is 3.5V, then need to be input into the voltage ability driven of 10.5V.Therefore, when supply voltage be 10.5~12.6V it
Between when, it is necessary to converter is operated in decompression mode, supply voltage is dropped into 10.5V；When supply voltage is between 9~10.5V,
Need converter to be operated in boost mode, supply voltage is raised to 10.5V.Such application needs a kind of converter, Ji Nenggong
Make in decompression mode, can also be operated in boost mode, so as to ensure that auxiliary obtains the operating voltage of stabilization.
As shown in figure 1, being a kind of implementation of prior art.Load Load1 is connected to output node VO and ground level
Between, switch S1, inductance L1 and switch S4 be sequentially connected in series between power input node VIN and output node VO, switch S2 and
Switch S3 has one end to be connected to the two ends of inductance L1 respectively, and the other end is all grounded, the control end of described switch S1, S2, S3, S4
It is respectively coupled control signal end DV1, DV2, DV3, DV4.
During work, cut-off by control signal end DV1, DV2, DV3, DV4 controlling switch S1, S2, S3, S4, first
Period, switch S1 and S3 is simultaneously turned on, and energy storage is carried out to inductance L1；In the second period, switch S2 and S4 is simultaneously turned on, inductance L1
Release energy.If the ratio that definition switch S1 and S3 ON times account for whole cycle is dutycycle D, output voltage and input
Voltage is followed：
When dutycycle D is less than 1/2, the input electricity of the output voltage UO less than power input node VIN of output node VO
Pressure UIN, converter is operated in decompression mode；When D is equal to 1/2, the output voltage UO of output node VO is equal to power input section
The input voltage UIN of point VIN；When D is more than 1/2, the output voltage UO of output node VO is defeated more than power input node VIN
Enter voltage UIN, converter is operated in boost mode.
By foregoing description, four switching devices used in existing converter to realize to the energy storage of inductance and
The conversion of release, but multiple switch device but brings the complicated and relatively costly defect of circuit structure.Meanwhile, each switch
All there is conducting resistance in device, electric current flows through switching device and can produce energy loss.Additionally, generally switch S1 and S4 need to be by PMOS
Transistor is constituted, expensive because its conducting resistance is big, also causes that converter has cost higher.
The content of the invention
Instant invention overcomes disadvantages mentioned above, there is provided a kind of simple structure, voltage boosting-reducing converter with low cost.
The technical scheme adopted by the invention to solve the technical problem is that：A kind of voltage boosting-reducing converter, including power supply is defeated
Ingress, inductance, an input capacitance and an output capacitance, the input capacitance are connected to power input node with ground
Between, also including a first switch, blocking element, output cathode node and an output negative pole node, the inductance connection
Between power input node and output cathode node, output capacitance be connected to output cathode node and output negative pole node it
Between, the first switch is connected between output cathode node and ground；The blocking element be connected to power input node with it is defeated
Go out between negative pole node, the blocking element is blocked from the power input node to output negative pole section in the inductive energy storage
Loop between point, turns on when inductance releases energy.
The blocking element can be diode, and the positive pole of the diode connects the output negative pole node, negative pole connection
The power input node.
The blocking element can be second switch, and when first switch is turned on, second switch disconnects；It is disconnected in first switch
When opening, second switch conducting.
When can have an of short duration dead band between the conducting period of the first switch and the conducting period of second switch
Between, in the Dead Time, first switch is simultaneously switched off with second switch.
The diode can use Schottky diode.
The first switch can use nmos pass transistor.
The present invention realizes the effect of voltage boosting-reducing using less switch, can not only reduce cost, while also reducing
The conduction loss produced using switch, so as to improve energy conversion efficiency.Additionally, the blocking element can be led using relatively low
The Schottky diode or switch of logical pressure drop, it is possible to achieve energy conversion efficiency higher.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of prior art；
Fig. 2 is the circuit theory diagrams of embodiment one in the present invention；
Fig. 3 is the circuit theory diagrams of embodiment two in the present invention.
Specific embodiment
The solution of the present invention and principle are illustrated with reference to Figure of description and specific embodiment, to help understanding
Present disclosure.
In the present invention, so-called " blocking element " is defined as：Can have to circuit in a certain period (such as during inductive energy storage)
There is block function, or there is the electronic component of block function to a direction electric current (such as the direction from VIN to VON).
So-called " connection " refers to electric connection.
As shown in Figure 2, it is the circuit theory diagrams of the embodiment of the present invention one.Voltage boosting-reducing in the embodiment of the present invention one
Converter, including power input node VIN, inductance L11, input capacitance C11, output capacitance C12, switch S11, diode D1,
Output cathode node VOP and output negative pole node VON.Wherein input capacitance C11 is connected to power input node VIN with ground
Between, inductance L11 is connected between power input node VIN and output cathode node VOP, and load Load11 is connected to output cathode
Between node VOP and output negative pole node VON, output capacitance C12 is also connected to output cathode node VOP and output negative pole node
Between VON, switch S11 is connected between output cathode node VOP and ground, and power supply is connected to as the diode D1 of blocking element
Between input node VIN and output negative pole node VON, and the positive pole of diode D1 is connected on output negative pole node VON, and negative pole connects electricity
The control end of source input node VIN, the switch S11 is connected to control signal end DV11, DV11 and is output as periodic duty
Than signal, controlling switch S11 is with dutycycle D1 batch (-type) turn-on and turn-off.
The course of work of above-mentioned first embodiment is as follows：In the first stage, switch S11 conductings, inductance L11 carries out energy storage,
Electric current flows through inductance L11 by power input node VIN, then flows into ground, and now diode D1 is in blocking state, blocks from power supply
Loop between input node VIN to output negative pole node VON；Second stage, switch S11 disconnects, and inductance L11 releases energy,
Electric current flows to inductance L11 by power input node VIN, then through overload Load11 and output capacitance C2, flows to diode D1, this
When diode D1 conducting, electric current returns to power input node VIN, the loop that formation releases energy again through the diode D1.
In stability, according to inductive magnetic flux amount conservation principle：
(UIN) × D × Ts+ (UIN- (UIN+UO1)) × (1-D) × Ts=0
Wherein UIN is the magnitude of voltage of power input node VIN, and UO1 is output voltage values, i.e. output cathode node VOP's
The voltage difference between voltage UON between voltage UOP and output negative pole node VON, i.e. UO1=UOP-UON, D lead for switch S11
Logical dutycycle, Ts is switch periods.
Above formula abbreviation is arranged:
When D is less than 1/2, output voltage UO1 is less than input voltage UIN, and converter is operated in decompression mode；When D is equal to
When 1/2, output voltage UO1 is equal to input voltage UIN；When D is more than 1/2, output voltage UO1 is more than input voltage UIN, conversion
Device is operated in boost mode, i.e., identical with the operating voltage conversion effect in background technology.
Due to the present invention only need two power devices, that is, switch S11 and diode D1, so contrast prior art, its into
This is less expensive.In addition, general diode D1 is lower than other power switch costs.In order to improve efficiency, the diode D1 can
To use the less Schottky diode of conduction voltage drop；The switch S11 can also be using the nmos pass transistor structure of source ground
Into, the price of the nmos pass transistor of general identical conducting resistance will be less than the price of PMOS transistor, therefore with lower cost
Advantage.
Fig. 3 is the circuit theory diagrams of embodiments in accordance with the present invention two.Embodiment two compared with embodiment one, circuit structure
Most of identical, difference is that the diode D1 in Fig. 2 is substituted for using switch S22, and the control end for switching S22 is connected to
Control signal end DV22.
The course of work of embodiment two is as follows：In the first stage, switch S21 conductings, switch S22 is disconnected, and inductance L21 is carried out
Energy storage, electric current flows through inductance L21 by power input node VIN, then flows into ground, now switchs S22 and disconnects, i.e., in blocking shape
State, blocks from the loop film input node VIN to output negative pole node VON；Second stage, switch S21 disconnects, switch
S22 is turned on, and inductance releases energy, and electric current flows to inductance L21 by power input node VIN, then through overload Load2 and output electricity
Hold C22, flow direction switch S22, now switch S22 and connect, electric current returns to power input node VIN, shape again through the switch S22
Into the loop for releasing energy.Voltage conversion formula is also identical with embodiment one, repeats no more here.
Wherein, the signal of control signal end DV21 outputs and the signal of control signal end DV22 outputs are not overlapping clock,
I.e. when DV21 is output as high level, DV22 is output as low level；When DV22 is output as high level, DV21 is output as low electricity
It is flat.In order to avoid two switches are simultaneously turned on, deposited between the high level of general DV21 outputs and the high level period of DV22 outputs
In an of short duration Dead Time, in this Dead Time, the output of DV21 and DV22 is simultaneously low level.I.e. so that described
There is an of short duration Dead Time between the conducting period of switch S21 and the conducting period of switch S22, in the Dead Time
Interior, switch S21 is simultaneously switched off with switch S22.
According to above-mentioned analysis it is recognized that while embodiment two employs two poles that a switch S22 instead of in embodiment one
Pipe D1, cost is more slightly higher than embodiment one, but switch S22 can realize the conduction voltage drop lower than diode D1.Ignoring conducting
Loss is ideally, it is possible to achieve energy conversion efficiency higher.
A kind of voltage boosting-reducing converter provided by the present invention is described in detail above, tool used herein
Body example is set forth to principle of the invention and implementation method, and the explanation of above example is only intended to help and understands this hair
Bright method and its core concept；Simultaneously for those of ordinary skill in the art, according to thought of the invention, specific real
Apply and be will change in mode and range of application, in sum, this specification content should not be construed as to limit of the invention
System.
Claims (6)
1. a kind of voltage boosting-reducing converter, including power input node, an inductance, an input capacitance and an output electricity
Hold, the input capacitance is connected between power input node and ground, it is characterised in that：Also include first switch, one
Individual blocking element, output cathode node and output negative pole node, the inductance connection is in power input node and output cathode section
Between point, output capacitance is connected between output cathode node and output negative pole node, and the first switch is being connected to output just
Between pole node and ground；The blocking element is connected between power input node and output negative pole node, the blocking element
In the inductive energy storage, blocking releases energy from the power input node to the loop output negative pole node in the inductance
When turn on.
2. voltage boosting-reducing converter according to claim 1, it is characterised in that：The blocking element is diode, described
The positive pole of diode connects the output negative pole node, and negative pole connects the power input node.
3. voltage boosting-reducing converter according to claim 1, it is characterised in that：The blocking element is second switch, and
When first switch is turned on, second switch disconnects；When first switch disconnects, second switch conducting.
4. voltage boosting-reducing converter according to claim 3, it is characterised in that：The conducting period of the first switch with
There is an of short duration Dead Time, in the Dead Time, first switch and second between the conducting period of second switch
Switch is simultaneously switched off.
5. voltage boosting-reducing converter according to claim 2, it is characterised in that：The diode uses the pole of Schottky two
Pipe.
6. the voltage boosting-reducing converter according to any one of Claims 1 to 5, it is characterised in that：The first switch is adopted
Use nmos pass transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410613503.6A CN104348361B (en) | 2014-11-04 | 2014-11-04 | A kind of voltage raising and reducing converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410613503.6A CN104348361B (en) | 2014-11-04 | 2014-11-04 | A kind of voltage raising and reducing converter |
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| Publication Number | Publication Date |
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| CN104348361A CN104348361A (en) | 2015-02-11 |
| CN104348361B true CN104348361B (en) | 2017-06-06 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734302B (en) | 2015-04-09 | 2017-03-15 | 北京京东方能源科技有限公司 | Power-supplying circuit and method of supplying power to |
| CN104917384A (en) * | 2015-06-29 | 2015-09-16 | 无锡中星微电子有限公司 | Voltage-reducing type converter |
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| CN102983744A (en) * | 2012-12-25 | 2013-03-20 | 深圳市华星光电技术有限公司 | DC/DC module for LCD driving circuit |
| CN103337973A (en) * | 2013-06-19 | 2013-10-02 | 华南理工大学 | BOOST-BUCK-BOOST bridgeless convertor |
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| CN103490621A (en) * | 2013-09-16 | 2014-01-01 | 华南理工大学 | Wide-gain buck-boost converter |
| CN103633833A (en) * | 2013-11-14 | 2014-03-12 | 华南理工大学 | Single-switching-tube converter Boost-Buck-Boost converter |
| CN204145295U (en) * | 2014-11-04 | 2015-02-04 | 无锡中星微电子有限公司 | Voltage boosting-reducing transducer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8274266B2 (en) * | 2009-08-14 | 2012-09-25 | Linear Technology Corporation | Switch mode power supply with dynamic topology |
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2014
- 2014-11-04 CN CN201410613503.6A patent/CN104348361B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001037212A (en) * | 1999-07-14 | 2001-02-09 | Nec Corp | Low voltage input dc-dc converter |
| CN201260128Y (en) * | 2008-08-26 | 2009-06-17 | 扬州中凌高科技发展有限公司 | Power-on shock protection circuit for AC/DC switch power supply |
| CN101771346A (en) * | 2008-12-31 | 2010-07-07 | 聚积科技股份有限公司 | Single-Stage High Power Factor Isolated AC-DC Converter with Leakage Inductive Energy Backfeed |
| JP5358387B2 (en) * | 2009-10-06 | 2013-12-04 | 日立アプライアンス株式会社 | Power supply |
| CN102983744A (en) * | 2012-12-25 | 2013-03-20 | 深圳市华星光电技术有限公司 | DC/DC module for LCD driving circuit |
| CN103337973A (en) * | 2013-06-19 | 2013-10-02 | 华南理工大学 | BOOST-BUCK-BOOST bridgeless convertor |
| CN103490621A (en) * | 2013-09-16 | 2014-01-01 | 华南理工大学 | Wide-gain buck-boost converter |
| CN103633833A (en) * | 2013-11-14 | 2014-03-12 | 华南理工大学 | Single-switching-tube converter Boost-Buck-Boost converter |
| CN204145295U (en) * | 2014-11-04 | 2015-02-04 | 无锡中星微电子有限公司 | Voltage boosting-reducing transducer |
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