CN103944390A - Switching power supply and control method thereof - Google Patents
Switching power supply and control method thereof Download PDFInfo
- Publication number
- CN103944390A CN103944390A CN201310025827.3A CN201310025827A CN103944390A CN 103944390 A CN103944390 A CN 103944390A CN 201310025827 A CN201310025827 A CN 201310025827A CN 103944390 A CN103944390 A CN 103944390A
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- CN
- China
- Prior art keywords
- power supply
- switching
- switching power
- switching transistor
- transistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000004065 semiconductor Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 11
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000001276 controlling effect Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
-
- 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
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a switching power supply, which comprises a transformer, a switching transistor group and a controller, wherein the primary coil of the transformer inputs initial voltage and the secondary coil outputs load voltage; the switching transistor group comprises a plurality of parallel switching transistors, and the plurality of parallel switching transistors are serially connected with the primary coil of the transformer; and the controller is used for outputting control signals to each switching transistor of the switching tube group, the number of the switching transistors in control of and in participation in operation of the switching power supply is increased when loads are increased, and the number of the switching transistors in control of and in participation in operation of the switching power supply is decreased when loads are reduced. The invention also provides a control method of the switching power supply. The switching power supply and the control method are small in loss in conditions of various loads, and high conversion efficiency is provided.
Description
Technical field
The present invention relates to switch power technology field, particularly relate to the control method of a kind of Switching Power Supply and a kind of Switching Power Supply.
Background technology
Switching Power Supply is to utilize modern power electronics technology, and the time ratio that control switch pipe turns on and off maintains a kind of power supply of regulated output voltage.Switching Power Supply is generally made up of pulse width modulation (PWM) control chip and switching tube (normally MOSFET).
More and more higher to the energy consumption standard of Switching Power Supply in the world, " committee's regulations (EC) No1275/2008 that for example European Commission announces, with regard to family expenses and the Eco-Design requirement of doing the standby of shared electron electric equipment and shutdown mode power consumption, carry out European Parliament and the instruction 2005/32/EC of council " mandatory requirement is at the product of input EU market in 2013, shutdown mode or standby/restart pattern power consumption must not exceed 0.5W, must not exceed 1W and have the product standby of Presentation Function or restart pattern power consumption.
For the laws and regulations of energy of reply high standard, reduce the energy consumption of Switching Power Supply, need to make in all sorts of ways and improve the conversion efficiency of Switching Power Supply.But traditional not high problem of method ubiquity conversion efficiency.Some methods can improve the conversion efficiency in the time of high capacity, and conversion efficiency is still lower in the time of zero load or underloading, or contrary, cause its adaptability wideless.
Summary of the invention
Based on this, be necessary to provide a kind of and can improve conversion efficiency and the wider Switching Power Supply of adaptability.
A kind of control method of Switching Power Supply is also provided in addition.
A kind of Switching Power Supply, comprising: transformer, its primary coil input initial voltage, secondary coil output loading voltage; Switching tube group, comprises multiple switching transistors parallel with one another, and the switching transistor of described multiple parallel connections and the primary coil of described transformer are connected; Controller, for outputting a control signal to each switching transistor of described switching tube group, and in the time that load increases, increase the quantity of the switching transistor of control and participate in Switching Power Supply work, in the time that reducing, load reduces the quantity of the switching transistor of control and participate in Switching Power Supply work.
In an embodiment, described switching transistor is metal-oxide-semiconductor therein.
In an embodiment, the initial voltage of described input is the direct current through over commutation therein.
In an embodiment, the control signal of described controller output comprises to be controlled the intermittent pulse-width signal of opening of described switching transistor and controls the pick-off signal that described switching transistor cuts out therein.
A control method for Switching Power Supply, based on above-mentioned Switching Power Supply, comprises the steps: to output a control signal to each switching transistor of described switching tube group; Detect the loading condition of described secondary coil one side; In the time of the increasing of load, increase the quantity of the switching transistor that participates in Switching Power Supply work, in the time that load reduces, reduce the quantity of the switching transistor of participation Switching Power Supply work.
In an embodiment, described switching transistor is metal-oxide-semiconductor therein.
In an embodiment, the initial voltage of described input is the direct current through over commutation therein.
In an embodiment, described control signal comprises to be controlled the intermittent pulse-width signal of opening of described switching transistor and controls the pick-off signal that described switching transistor cuts out therein.
Above-mentioned Switching Power Supply and control method thereof are adjusted the transistorized quantity of switch according to loading condition, all have less loss in the situation that of various load, thereby also have higher conversion efficiency.
Brief description of the drawings
Fig. 1 is the switching power circuit schematic diagram of an embodiment;
Fig. 2 is the control method flow chart of the Switching Power Supply of an embodiment.
Embodiment
As shown in Figure 1, be the switching power circuit schematic diagram of an embodiment.This Switching Power Supply 10 comprises transformer T, switching tube group 100 and controller 200.The primary coil Lf input initial voltage Vin of transformer T, the initial voltage Vin of input can be the direct current through over commutation.Secondary coil Ls output loading voltage Vout.Switching Power Supply 10 in Fig. 1 also comprises that other are the device of realizing switch power source function, and its connected mode is this area routine techniques, is not repeated herein.
In the present embodiment, switching tube group 100 comprises multiple switching transistor S1 ~ Sn parallel with one another, and the switching transistor S1 ~ Sn of described multiple parallel connections and the primary coil Lf of transformer T connect.In a preferred embodiment, described switching transistor is metal-oxide-semiconductor, and concrete parallel way is that the source electrode of all metal-oxide-semiconductors interconnects, draining also interconnects.The grid of metal-oxide-semiconductor is connected with controller 200.
Controller 200 is for outputting a control signal to each switching transistor of described switching tube group 100, and along with increasing of load increases the quantity of the switching transistor of control and participate in Switching Power Supply work gradually.
For example, when load is 0(zero load) time, only control switch S1;
When load is 10%(underloading) time, control switch S1 simultaneously, S2 and S3(determine according to conversion efficiency demand);
……
When load is that 100%(is fully loaded) time, control switch S1 ~ Sn simultaneously.
The control signal that controller 200 is exported comprises to be controlled intermittent pulse-width modulation (PWM) signal of opening of described switching transistor and controls the pick-off signal that described switching transistor cuts out.Wherein pwm signal control switch transistor is intermittent opens, and recently adjusts the load voltage of output by adjusting the duty of pwm signal.Pick-off signal, for turn-offing controlled switching transistor, makes it not participate in controlling primary coil Lf.
Above-mentioned Switching Power Supply, in the time of zero load, for example, participates in controlling primary coil Lf with a switching transistor (S1), can minimize switching loss;
When underloading, participate in controlling primary coil Lf according to the multiple switching transistors of how many uses of load, make the summation minimum of switching loss and conduction loss;
Full load, uses whole switching transistors to participate in controlling primary coil Lf, makes conduction loss minimum.Switching Power Supply has higher conversion efficiency all the time like this.
As shown in Figure 2, be the control method flow chart of the Switching Power Supply of an embodiment.The Switching Power Supply 10 of the method based on above-described embodiment, comprises the steps:
S101: each switching transistor that outputs a control signal to switching tube group.According to initial condition output control signal, for example, start only control switch transistor S1 most and participate in controlling primary coil Lf.In a preferred embodiment, described switching transistor is metal-oxide-semiconductor.Initial voltage is the direct current through over commutation.
S102: the loading condition that detects described secondary coil one side.Loading condition comprises zero load, fully loaded and situation between unloaded and fully loaded.Concrete, can detect load ratio, for example 10% etc.
S103: increase the quantity of the switching transistor that participates in Switching Power Supply work in the time of the increasing of load, reduce the quantity of the switching transistor of participation Switching Power Supply work in the time that load reduces.
For example, when load is 0(zero load) time, only control switch transistor S1;
When load is 10%(underloading) time, control switch transistor S1 simultaneously, S2 and S3(determine according to conversion efficiency demand);
……
When load is that 100%(is fully loaded) time, control switch transistor S1 ~ Sn simultaneously.
The control signal that controller 200 is exported comprises to be controlled intermittent pulse-width modulation (PWM) signal of opening of described switching transistor and controls the pick-off signal that described switching transistor cuts out.Wherein pwm signal control switch transistor is intermittent opens, and recently adjusts the load voltage of output by adjusting the duty of pwm signal.Pick-off signal, for turn-offing controlled switching transistor, makes it not participate in controlling primary coil Lf.
The control method of above-mentioned Switching Power Supply, in the time of zero load, for example, participates in controlling primary coil Lf with a switching transistor (S1), can minimize switching loss;
When underloading, participate in controlling primary coil Lf according to the multiple switching transistors of how many uses of load, make the summation minimum of switching loss and conduction loss;
Full load, uses whole switching transistors to participate in controlling primary coil Lf, makes conduction loss minimum.Switching Power Supply has higher conversion efficiency all the time like this.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (8)
1. a Switching Power Supply, comprising:
Transformer, its primary coil input initial voltage, secondary coil output loading voltage;
Switching tube group, comprises multiple switching transistors parallel with one another, and the switching transistor of described multiple parallel connections and the primary coil of described transformer are connected;
Controller, for outputting a control signal to each switching transistor of described switching tube group, and in the time that load increases, increase the quantity of the switching transistor of control and participate in Switching Power Supply work, in the time that reducing, load reduces the quantity of the switching transistor of control and participate in Switching Power Supply work.
2. Switching Power Supply according to claim 1, is characterized in that, described switching transistor is metal-oxide-semiconductor.
3. Switching Power Supply according to claim 1, is characterized in that, the initial voltage of described input is the direct current through over commutation.
4. Switching Power Supply according to claim 1, is characterized in that, the control signal of described controller output comprises to be controlled the intermittent pulse-width signal of opening of described switching transistor and controls the pick-off signal that described switching transistor cuts out.
5. a control method for Switching Power Supply, based on Switching Power Supply as claimed in claim 1, is characterized in that, comprises the steps:
Output a control signal to each switching transistor of described switching tube group;
Detect the loading condition of described secondary coil one side;
In the time of the increasing of load, increase the quantity of the switching transistor that participates in Switching Power Supply work, in the time that load reduces, reduce the quantity of the switching transistor of participation Switching Power Supply work.
6. the control method of Switching Power Supply according to claim 5, is characterized in that, described switching transistor is metal-oxide-semiconductor.
7. the control method of Switching Power Supply according to claim 5, is characterized in that, the initial voltage of described input is the direct current through over commutation.
8. the control method of Switching Power Supply according to claim 5, is characterized in that, described control signal comprises to be controlled the intermittent pulse-width signal of opening of described switching transistor and controls the pick-off signal that described switching transistor cuts out.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310025827.3A CN103944390A (en) | 2013-01-23 | 2013-01-23 | Switching power supply and control method thereof |
| PCT/CN2013/091158 WO2014114177A1 (en) | 2013-01-23 | 2013-12-31 | Switching power supply and control method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310025827.3A CN103944390A (en) | 2013-01-23 | 2013-01-23 | Switching power supply and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103944390A true CN103944390A (en) | 2014-07-23 |
Family
ID=51191921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310025827.3A Pending CN103944390A (en) | 2013-01-23 | 2013-01-23 | Switching power supply and control method thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103944390A (en) |
| WO (1) | WO2014114177A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109768696A (en) * | 2018-11-23 | 2019-05-17 | 西安电子科技大学 | Variable on-resistance switching circuit for boost converters for thermoelectric energy harvesting |
| CN115940661A (en) * | 2023-03-14 | 2023-04-07 | 苏州锴威特半导体股份有限公司 | MOSFET (Metal-oxide-semiconductor field Effect transistor) stepped driving control circuit and control method for isolating converter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1674423A (en) * | 2004-03-26 | 2005-09-28 | 三星电子株式会社 | DC-DC converter and control method thereof |
| CN101459383A (en) * | 2007-12-14 | 2009-06-17 | 雅达电子国际有限公司 | Switching power converter with reduced switching losses |
| JP2009278836A (en) * | 2008-05-16 | 2009-11-26 | Kyocera Mita Corp | Switching power circuit and image forming apparatus |
| CN102097924A (en) * | 2011-02-11 | 2011-06-15 | 华为技术有限公司 | Drive control circuit for shunt-wound synchronous rectification tubes and switching power supply |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005033888A (en) * | 2003-07-10 | 2005-02-03 | Seiko Instruments Inc | Switching regulator control circuit |
| CN101383560A (en) * | 2007-09-05 | 2009-03-11 | 财团法人工业技术研究院 | DC voltage converter |
| CN101562929B (en) * | 2009-05-15 | 2012-12-12 | 广州金升阳科技有限公司 | Isolated driving power for high-power light emitting diode |
-
2013
- 2013-01-23 CN CN201310025827.3A patent/CN103944390A/en active Pending
- 2013-12-31 WO PCT/CN2013/091158 patent/WO2014114177A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1674423A (en) * | 2004-03-26 | 2005-09-28 | 三星电子株式会社 | DC-DC converter and control method thereof |
| CN101459383A (en) * | 2007-12-14 | 2009-06-17 | 雅达电子国际有限公司 | Switching power converter with reduced switching losses |
| JP2009278836A (en) * | 2008-05-16 | 2009-11-26 | Kyocera Mita Corp | Switching power circuit and image forming apparatus |
| CN102097924A (en) * | 2011-02-11 | 2011-06-15 | 华为技术有限公司 | Drive control circuit for shunt-wound synchronous rectification tubes and switching power supply |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109768696A (en) * | 2018-11-23 | 2019-05-17 | 西安电子科技大学 | Variable on-resistance switching circuit for boost converters for thermoelectric energy harvesting |
| CN115940661A (en) * | 2023-03-14 | 2023-04-07 | 苏州锴威特半导体股份有限公司 | MOSFET (Metal-oxide-semiconductor field Effect transistor) stepped driving control circuit and control method for isolating converter |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2014114177A1 (en) | 2014-07-31 |
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Application publication date: 20140723 |