CN101847934B - Switching power supply - Google Patents
Switching power supply Download PDFInfo
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- CN101847934B CN101847934B CN2010101701123A CN201010170112A CN101847934B CN 101847934 B CN101847934 B CN 101847934B CN 2010101701123 A CN2010101701123 A CN 2010101701123A CN 201010170112 A CN201010170112 A CN 201010170112A CN 101847934 B CN101847934 B CN 101847934B
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- 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
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Abstract
The invention discloses a switching power supply, which comprises a transformer, a first control circuit and a second control circuit. The first control circuit is coupled with the primary winding of the transformer and comprises a driving circuit, the second control circuit is coupled with the secondary winding of the transformer and comprises a current pulse output circuit, a switching signal detection circuit and a switching-off interval calculating circuit; the first control circuit also comprises an electric signal detection circuit; the switching signal detection circuit detects action signals of a power switching tube; the switching-off interval calculating circuit starts the current pulse output circuit when the interval of two adjacent action signals exceeds a first set time; the current pulse output circuit outputs a time-out control command to the electric signal detection circuit; and the electric signal detection circuit starts the driving circuit, and the driving circuit controls the conduction of the power switching tube. The invention can be applied in the switching power supply system, and can effectively reduce the standby power consumption and improve the accuracy of the system output voltage under light-load and no-load conditions.
Description
Technical field
The present invention relates to the electronic circuit technology field, more particularly, relate to a kind of Switching Power Supply.
Background technology
Switching Power Supply is widely used in a plurality of fields such as charger for mobile phone, power supply adaptor owing to having a plurality of advantages such as small size, high conversion efficiency and large output loading capability.Along with the increasingly stringent of development and the energy-conservation requirement of technology, the Switching Power Supply with super-low standby power consumption is studied widely and is used.
Fig. 1 is the systematic schematic diagram of existing Switching Power Supply.This Switching Power Supply comprises the transformer that the auxiliary winding 107 of transformer primary side winding 105, transformer secondary winding 106 and transformer forms, be coupled to the first control circuit 110 of transformer primary side winding 106, first control circuit 110 comprises drive circuit 111 and feedback control circuit 112.The base stage of power switch pipe 108 connects first control circuit 110, the different name end of the former limit of collector electrode connection transformer winding 105, and emitter is by the first resistance 101 ground connection.Between two outputs of transformer secondary winding 106 and downlink connection the first electric capacity 102 and the second resistance 103.
This Switching Power Supply is sent to energy the output of transformer secondary winding 106 by the turn-on and turn-off of the drive circuit 111 power ratio control switching tubes 108 of first control circuit 110 by transformer primary side winding 105.But when the load variations of output, the output voltage V of this Switching Power Supply
OUTBe difficult to guarantee accurate, stable.
When the output load changes to zero load from underloading, even switching frequency decreases, output voltage V
OUTStill can begin to rise because load can't consume the energy of power switch pipe 108 each switch outputs, make output voltage V
OUTForm upper punch trend in underloading to the unloaded stage, cause output voltage V
OUTNot accurately, stable.
See Fig. 2, Fig. 2 is the output voltage V of existing Switching Power Supply
OUTWith the curve synoptic diagram of output load, as can be seen from Figure 2, in extremely unloaded stage of underloading, output voltage V
OUTThe upper punch phenomenon is obvious.At present, common adjustment means are the resistances that change the second resistance 103, the excess energy of output when the second resistance 103 is mainly used in consuming switch power supply no-load work, and effect is equivalent to load, is called as " illusory load ".But the switching frequency when the too small meeting of the resistance of the second resistance 103 increases zero load can't guarantee lower loss; The resistance of the second resistance 103 is crossed conference and is required switching frequency further to reduce, otherwise output voltage V can increase the weight of switch power supply no-load the time
OUTThe upper punch amplitude, more be unfavorable for output voltage V
OUTAccurately, stable, and reduce switching frequency before to make demands be that the voltage that this frequency must be kept on the electric capacity 109 of first control circuit 110 is not less than certain value, prevent that first control circuit from quitting work.
Summary of the invention
In view of this, the invention provides a kind of Switching Power Supply, this Switching Power Supply can reduce stand-by power consumption effectively, improves the output voltage precision of underloading and unloaded scope.
The invention provides a kind of Switching Power Supply, comprise transformer primary side winding, the auxiliary winding of transformer and transformer secondary winding, be coupled to the first control circuit of described transformer primary side winding, described first control circuit comprises drive circuit; The output of described drive circuit connects the control end of power switch pipe, and a conduction terminal of described power switch pipe connects described transformer primary side winding, and another conduction terminal also comprises by the first grounding through resistance:
Be coupling in the second control circuit of described transformer secondary winding, described second control circuit comprises current impulse output circuit, switching signal testing circuit and the time calculation circuit that holds off interval: described first control circuit also comprises the electrical signal detection circuit;
Described switching signal testing circuit for detection of the actuating signal of described power switch pipe, sends to the described time calculation circuit that holds off interval with the actuating signal that detects;
The described time calculation circuit that holds off interval when being used for surpassing the first setting-up time at the interval of facing mutually twice actuating signal, starts described current impulse output circuit;
Described current impulse output circuit is used for the output overtime control command to described electrical signal detection circuit;
Described electrical signal detection circuit is used for starting described drive circuit, and described drive circuit is controlled described power switch pipe conducting.
Preferably, described second control circuit also comprises the discharge clamp circuit: the described time calculation circuit that holds off interval is judged when the interval of facing mutually twice turn-off time surpasses the first setting-up time, starts described discharge clamp circuit; Described discharge clamp circuit is used for higher limit clamper with the output voltage of described Switching Power Supply at the second setting voltage.
Preferably, described switching signal testing circuit detects at least one times Continuity signal of described power switch pipe, and the described discharge clamp circuit of instruction quits work.
Preferably, described second control circuit also comprises output voltage detecting circuit, for detection of the output voltage of described Switching Power Supply, is lower than the 3rd setting voltage such as output voltage, starts described current impulse output circuit; Described current impulse output circuit output LOW voltage control command arrives described electrical signal detection circuit, the described drive circuit of described electrical signal detection circuit start, and described drive circuit is controlled described power switch pipe conducting.
Preferably, described voltage detecting circuit detects output voltage and is lower than the second setting voltage, and the described discharge clamp circuit of instruction quits work.
Preferably, the Same Name of Ends of described transformer primary side winding is by the second resistance and second capacity earth of series connection.
Preferably, the different name end of the auxiliary winding of described transformer connects the common port of the second resistance and the second electric capacity by the first diode, wherein, the different name end of the auxiliary winding of the anodic bonding transformer of the first diode, negative electrode connects the common port of the second resistance and the second electric capacity.
Preferably, the Same Name of Ends ground connection of the auxiliary winding of described transformer, the different name end is by the 3rd resistance and the 4th grounding through resistance of series connection.
Preferably, connect the first electric capacity between described transformer secondary winding output and the ground.
Preferably, the different name end of described transformer secondary winding connects the anode of the second diode, and the negative electrode of the second diode connects output.
The present invention is applied in the switch power supply system, can effectively reduce stand-by power consumption, improve system's output voltage precision of underloading and unloaded scope, reduce because output voltage undershoot or the upper punch that causes switched in output loading, improve simultaneously the energy conversion efficiency of switch power supply system.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the systematic schematic diagram of existing Switching Power Supply;
Fig. 2 is the output voltage V of existing Switching Power Supply
OUTCurve synoptic diagram with the output load;
Fig. 3 is Switching Power Supply the first embodiment schematic diagram of the present invention;
Fig. 4 is switch power source output voltage V of the present invention
OUTWith output load relationship curve chart;
Fig. 5 is another embodiment schematic diagram of second control circuit of the present invention;
Fig. 6 is the internal logic signal oscillogram of first control circuit of the present invention and the second control.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Referring to Fig. 3, Switching Power Supply the first embodiment of the present invention is shown, this Switching Power Supply comprises transformer primary side winding 205, transformer secondary winding 206, the auxiliary winding 207 of transformer, is coupled to the first control circuit 210 of transformer primary side winding 206.The base stage of power switch pipe 200 connects first control circuit 210, the different name end of the former limit of collector electrode connection transformer winding 205, and emitter is by the first resistance 201 ground connection.
The Same Name of Ends of transformer primary side winding 205 is connected with power supply chip VaC400, and the Same Name of Ends of this transformer primary side winding 205 is the second resistance 208 and the second electric capacity 209 ground connection by connecting also.The Same Name of Ends ground connection of the auxiliary winding 207 of transformer, the different name end is by the 3rd resistance 203 and the 4th resistance 204 ground connection of series connection.The different name end of the auxiliary winding 207 of transformer also connects the common port of the second resistance 208 and the second electric capacity 209 by the first diode 202, wherein, the different name end of the auxiliary winding 207 of the anodic bonding transformer of the first diode 202, negative electrode connects the common port of the second resistance 208 and the second electric capacity 209.
The turn-on and turn-off of the drive circuit 211 power ratio control switching tubes 200 of first control circuit 210, the turn-on and turn-off signal of power ratio control switching tube 200 is sent to transformer secondary winding 206 by transformer primary side winding 205.The actuating signal signal of the switching signal testing circuit 312 detection power switching tubes 200 of second control circuit 310 is sent to the time calculation circuit 313 that holds off interval with this actuating signal.
The blanking time that the time calculation circuit 313 that holds off interval calculates adjacent twice actuating signal is as surpassing the first setting-up time, starting current impulse output circuit 311 blanking time.Current impulse output circuit 311 output overtime control commands make to produce the resonance bell signal on the transformer secondary winding 206, and this resonance bell signal is sent to transformer primary side winding 205.The electrical signal detection circuit 213 of first control circuit 210 detects this resonance bell signal, and notice drive circuit conducting power switch pipe 200 is not less than power switch pipe 108 switching frequencies
Wherein, Tmax is the maximum switch periods of power switch pipe 200, and this switching frequency guarantees Switching Power Supply in the unloaded stage of output, and the voltage that has enough energy to keep on the electric capacity 209 is not less than certain value, guarantees that first control circuit can work.The time T off that holds off interval of the present invention is not more than T
Max-T
On-T
Delay, be not less than F1 to guarantee switching frequency.Wherein Ton is the ON time of power switch pipe, and Tdelay is the transmission delay of inside circuit.
Actuating signal of the present invention can be Continuity signal or cut-off signals.
Referring to Fig. 4, be switch power source output voltage V of the present invention
OUTWith output load relationship curve chart, as can be seen from Figure 4, output voltage V
OUTObviously reduce to unloaded stage upper punch degree in underloading, substantially satisfy switch power source output voltage V
OUTThe requirement of stability.
The present invention is by the longest time that holds off interval of power switch pipe 200 in limiting Switching Power Supply, to guarantee that first control circuit 210 all can obtain to keep the required energy of Switching Power Supply normal operation under any nominal operation state, thereby reduce to greatest extent the switching frequency of Switching Power Supply when zero load, reduce stand-by power consumption.The present invention also can make Switching Power Supply when zero load, guarantees the precision of unloaded and underloading scope output voltage VO UT by second control circuit 310.Simultaneously, the present invention saves Switching Power Supply secondary winding 206 outputs to the resistance (being the second resistance 103 in the background technology) on ground.The present invention is by arranging second control circuit 310 at transformer secondary winding 206, effectively limit switch power tube 108 holds off interval the time, reduced switching frequency, simultaneously the present invention is by the higher limit of limit switch power supply output voltage VO UT when zero load, the excessive drawback of output voltage VO UT upper punch amplitude when effectively avoiding excessive cause unloaded of " illusory load " resistance.More accurate for the output voltage V out that makes Switching Power Supply, the present invention also can be by higher limit and the lower limit of second control circuit 310 limit switch electric power output voltage Vout.
When power switch pipe 200 of the present invention was triode, the control end of power switch pipe 200 and conduction terminal were respectively base stage, collector and emitter.When power switch pipe 200 of the present invention is metal-oxide-semiconductor, the control end of power switch pipe 200 and conduction terminal are respectively grid, source electrode and drain electrode referring to Fig. 5, be another embodiment schematic diagram of second control circuit of the present invention, second control circuit 310 comprises current impulse output circuit 311, switching signal testing circuit 312 and the time calculation circuit 313 that holds off interval, output voltage detecting circuit 314 and discharge clamp circuit 315.
Hold off interval time calculation circuit 313 when surpass the first setting-up time the blanking time of facing mutually twice shutoff, start discharge clamp circuit 315.Discharge clamp circuit 315 with the output voltage limit value clamper of Switching Power Supply at the second setting voltage.Switching signal testing circuit 312 detects the cut-off signals of power switch pipe 200, and instruction discharge clamp circuit 315 quits work again.
The output voltage V out of output voltage detecting circuit 314 sense switch power supplys is lower than the 3rd setting voltage (the 3rd setting voltage is lower than the second setting voltage), starting current impulse output circuit 311 such as output voltage.Current impulse output circuit 311 output voltages are crossed low instruction, make to produce the resonance bell signal on the transformer secondary winding 206, and this resonance bell signal is sent to transformer primary side winding 205.The electrical signal detection circuit 213 of first control circuit 210 detects this resonance bell signal, 200 conductings of notice drive circuit conducting power switch pipe, and the energy of increase output promotes output voltage V out.
The second setting voltage and the 3rd setting voltage are set according to Switching Power Supply characteristic and loading demand, and the second setting voltage and the 3rd setting voltage all satisfy load normal operation demand.
Referring to Fig. 6, the internal logic signal oscillogram of first control circuit of the present invention and the second control is shown.Detect the switching signal switch of power switch pipe 200 when switching signal testing circuit 312 after, start the time calculation circuit 313 that holds off interval, hold off interval time calculation circuit 313 T1 produce the EN signal after the time and by current impulse output circuit 311 by to the 206 output switch current impulses of transformer secondary winding, make and produce resonance bell signal pulse on the transformer secondary winding 206.
Electrical signal detection circuit 213 can be opened power switch pipe 200 after detecting this pulse signal immediately, guarantees that twice time interval between the switch is not more than
In the EN signal valid period, the discharge clamp circuit 315 detect output voltage V out greater than voltage V1 (the second setting voltage) after, by discharge signal discharge switch power source output voltage Vout higher limit is clamped to voltage V1 immediately.
In discharge process, the switch gap time that is consecutively detected one or many power switch pipe 200 when switching signal testing circuit 312 less than T1 (the first setting-up time) after, close the EN signal and allow the discharge clamp circuit quit work.After switch power source output voltage VOUT is lower than voltage V1, also can closes the EN signal and allow the discharge clamp circuit quit work.
When power switch pipe 200 with fixed frequency
During switch, needed input power can guarantee that the supply voltage VCC of first control circuit 210 is not less than voltage V3, and wherein voltage V3 voltage is more than or equal to the minimum voltage value of keeping first control circuit 210 normal operations.
After output voltage detecting circuit 314 detects output voltage V out and is lower than voltage V2 (the 3rd setting voltage), starting current impulse output circuit 311 passes through to the 206 output switch current impulses of transformer secondary winding immediately, make and produce resonance bell signal pulse on the transformer secondary winding 206, first control circuit 210 can be opened power switch pipe 200 after detecting the pulse signal immediately, in time provides energy for output.
The present invention is applied in the switch power supply system, can effectively reduce stand-by power consumption, improve system's output voltage precision of underloading and unloaded scope, reduce because output voltage undershoot or the upper punch that causes switched in output loading, improve simultaneously the energy conversion efficiency of switch power supply system.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, in other embodiments realization.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a Switching Power Supply comprises transformer primary side winding, the auxiliary winding of transformer and transformer secondary winding, is coupled to the first control circuit of described transformer primary side winding, and described first control circuit comprises drive circuit; The output of described drive circuit connects the control end of power switch pipe, and a conduction terminal of described power switch pipe connects described transformer primary side winding, and another conduction terminal characterized by further comprising by the first grounding through resistance:
Be coupling in the second control circuit of described transformer secondary winding, described second control circuit comprises current impulse output circuit, switching signal testing circuit and the time calculation circuit that holds off interval: described first control circuit also comprises the electrical signal detection circuit;
Described switching signal testing circuit for detection of the actuating signal of described power switch pipe, sends to the described time calculation circuit that holds off interval with the actuating signal that detects;
The described time calculation circuit that holds off interval when being used for surpassing the first setting-up time at the interval of facing mutually twice actuating signal, starts described current impulse output circuit;
Described current impulse output circuit is used for the output overtime control command to described electrical signal detection circuit;
Described electrical signal detection circuit is used for starting described drive circuit, and described drive circuit is controlled described power switch pipe conducting.
2. Switching Power Supply as claimed in claim 1 is characterized in that, described second control circuit also comprises the discharge clamp circuit:
The described time calculation circuit that holds off interval is judged when the interval of facing mutually twice turn-off time surpasses the first setting-up time, starts described discharge clamp circuit;
Described discharge clamp circuit is used for higher limit clamper with the output voltage of described Switching Power Supply at the second setting voltage.
3. Switching Power Supply as claimed in claim 2 is characterized in that, described switching signal testing circuit detects at least one times Continuity signal of described power switch pipe, and the described discharge clamp circuit of instruction quits work.
4. Switching Power Supply as claimed in claim 2, it is characterized in that, described second control circuit also comprises output voltage detecting circuit, for detection of the output voltage of described Switching Power Supply, be lower than the 3rd setting voltage such as output voltage, start described current impulse output circuit;
Described current impulse output circuit output LOW voltage control command arrives described electrical signal detection circuit, the described drive circuit of described electrical signal detection circuit start, and described drive circuit is controlled described power switch pipe conducting.
5. Switching Power Supply as claimed in claim 4 is characterized in that, described voltage detecting circuit detects output voltage and is lower than the second setting voltage, and the described discharge clamp circuit of instruction quits work.
6. such as each described Switching Power Supply of claim 1 to 4, it is characterized in that, the Same Name of Ends of described transformer primary side winding is by the second resistance and second capacity earth of series connection.
7. Switching Power Supply as claimed in claim 6, it is characterized in that, the different name end of the auxiliary winding of described transformer connects the common port of the second resistance and the second electric capacity by the first diode, wherein, the different name end of the auxiliary winding of the anodic bonding transformer of the first diode, negative electrode connects the common port of the second resistance and the second electric capacity.
8. such as each described Switching Power Supply of claim 1 to 4, it is characterized in that, the Same Name of Ends ground connection of the auxiliary winding of described transformer, the different name end is by the 3rd resistance and the 4th grounding through resistance of series connection.
9. such as each described Switching Power Supply of claim 1 to 4, it is characterized in that, connect the first electric capacity between described transformer secondary winding output and the ground.
10. such as each described Switching Power Supply of claim 1 to 4, it is characterized in that, the different name end of described transformer secondary winding connects the anode of the second diode, and the negative electrode of the second diode connects output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101701123A CN101847934B (en) | 2010-05-07 | 2010-05-07 | Switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101701123A CN101847934B (en) | 2010-05-07 | 2010-05-07 | Switching power supply |
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| CN101847934A CN101847934A (en) | 2010-09-29 |
| CN101847934B true CN101847934B (en) | 2013-01-23 |
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| CN2010101701123A Active CN101847934B (en) | 2010-05-07 | 2010-05-07 | Switching power supply |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8680431B2 (en) * | 2010-11-15 | 2014-03-25 | Lincoln Global, Inc. | Device and method to control a power source |
| CN102097949B (en) * | 2011-01-07 | 2013-11-27 | 上海新进半导体制造有限公司 | Switching power supply and controlling method thereof |
| CN102736525A (en) * | 2011-04-13 | 2012-10-17 | 保锐科技股份有限公司 | Electronic device and standby power supply control system thereof and standby power supply control method |
| CN102843050B (en) | 2012-07-12 | 2015-07-22 | 上海新进半导体制造有限公司 | Method and circuit for improving system output characteristics of switch power supply |
| US9166486B2 (en) * | 2013-03-08 | 2015-10-20 | Power Integrations, Inc. | Power converter using multiple controllers |
| CN103296895A (en) * | 2013-06-03 | 2013-09-11 | 杭州电子科技大学 | DC-DC voltage switching circuit |
| CN110609483A (en) * | 2015-11-30 | 2019-12-24 | 广州昂宝电子有限公司 | Method for realizing real-time change of state of intelligent equipment and intelligent equipment |
| CN107367700B (en) * | 2016-05-11 | 2020-06-05 | 美芯晟科技（北京）有限公司 | Detection circuit and detection method of LED switching power supply |
| CN113991611B (en) * | 2021-12-03 | 2024-04-12 | 阳光电源股份有限公司 | Switch power supply and protection circuit thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1161597A (en) * | 1996-10-21 | 1997-10-08 | 成都希望电子研究所 | Circuit for avoiding instantaneous short circuit of lower power tube with higher one of dc-to-ac converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009165316A (en) * | 2008-01-10 | 2009-07-23 | Panasonic Corp | Switching power supply and semiconductor used in the switching power supply |
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- 2010-05-07 CN CN2010101701123A patent/CN101847934B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1161597A (en) * | 1996-10-21 | 1997-10-08 | 成都希望电子研究所 | Circuit for avoiding instantaneous short circuit of lower power tube with higher one of dc-to-ac converter |
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Effective date of registration: 20210129 Address after: 1600 Zixing Road, Minhang District, Shanghai Patentee after: BCD (SHANGHAI) MICRO-ELECTRONICS Ltd. Address before: Ojinend house, South Church Street, George Town, British Caymans Patentee before: BCD Semiconductor Manufacturing Ltd. |