CN201781416U - Power converter capable of reducing standby loss - Google Patents
Power converter capable of reducing standby loss Download PDFInfo
- Publication number
- CN201781416U CN201781416U CN2009201788469U CN200920178846U CN201781416U CN 201781416 U CN201781416 U CN 201781416U CN 2009201788469 U CN2009201788469 U CN 2009201788469U CN 200920178846 U CN200920178846 U CN 200920178846U CN 201781416 U CN201781416 U CN 201781416U
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- China
- Prior art keywords
- voltage
- power supply
- electric
- changeover device
- controlled switch
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- 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.)
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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
A power converter capable of reducing standby loss is characterized in that a first electrical control switch, a current detection and conversion unit, a power controller and a voltage detection and control unit are arranged on the primary side of a first transformer, and a synchronous rectification circuit, two MOSFETs (Metal-Oxide-Semiconductor Field Effect Transistor) and an oscillating circuit are arranged on the secondary side of the first transformer. When the power converter is in practical operation, the current detection and conversion unit outputs an AC voltage signal to the power controller and outputs a DC voltage signal to the voltage detection and control unit, and the voltage detection and control unit compares the DC voltage signal with a reference voltage, so that the synchronous rectification circuit can be closed when no load, and body diodes of the two MOSFETs are utilized for rectification. Therefore, the power converter can reduce the power loss when no load, and has the effect of energy conservation.
Description
Technical field
The utility model is relevant with the technology of power source conversion, is meant a kind of power supply changeover device that reduces idling consumption especially.
Background technology
Existing direct current has power loss to direct current transducer (DC/DC converter) in the process of carrying out power source conversion, the loss of this power has reduced the efficient of conversion.
Yet direct current increases in the requirement of power density day by day to direct current transducer, in order to improve its conversion efficiency, present widely used mode be secondary side at transformer with power MOSFET transistor (power MOSFET) as the synchronous rectification switch element.Efficient when this kind mode can improve heavy duty really, but because increased power loss when driving, so the loss on the power is still arranged when no-load, the efficient when having caused no-load is lower.
U.S. US7,443, No. 146 patents have promptly disclosed the technology of carrying out rectification with MOSFET at secondary side, and it has the above-mentioned disappearance that still has the loss on the power when no-load.
Summary of the invention
Main purpose of the present utility model is to provide a kind of power supply changeover device that reduces idling consumption, and the power loss of its transducer capable of reducing power source under the no-load pattern has effect of saving energy.
In order to reach aforementioned purpose, according to a kind of power supply changeover device that reduces idling consumption provided by the utility model, include: a direct current power supply has a positive terminal and a negative pole end; One first transformer has a primary side and a secondary side;
Wherein, an end of this primary side is connected in the positive terminal of this DC power supply, and this primary side has: one first electric-controlled switch has a control end, and is connected in the other end of this primary side; One current sense and converting unit, be connected in the negative pole end of this first electric-controlled switch and this DC power supply, the power supply that detecting is transmitted through this first electric-controlled switch by this primary side, and be converted to an alternating voltage signal and a direct current voltage signal, and respectively by an AC signal end and direct current signal end output; One power controller is connected in the control end of this AC signal end and this first electric-controlled switch; One detecting voltage and control unit are connected in this dc signal end, detect the voltage of this dc signal end, and this detecting voltage and control unit have a voltage output end;
The secondary side of this first transformer has: a synchronous rectification circuit has a voltage controling end and is connected in this voltage output end; Two MOSFET (metal-oxide half field effect transistor) are connected in this circuit of synchronous rectification, and these two MOSFET have an internal body diodes (Body Diode) respectively; And an oscillation circuit, an end ground connection, the other end is connected in an end of this secondary side, and this oscillation circuit is in order to being connected in a load, this oscillation circuit and have and feedback end and be connected in this power controller.
By the foregoing circuit structure, can reach the power loss when reducing no-load by the change-over circuit of this current sense and converting unit and detecting voltage and control unit, and then have effect of saving energy.
Description of drawings
Fig. 1 is the circuit diagram of the utility model first preferred embodiment.
Fig. 2 is the circuit structure diagram of the utility model first preferred embodiment.
Fig. 3 is the circuit structure diagram of the utility model second preferred embodiment.
Fig. 4 is the circuit structure diagram of the utility model the 3rd preferred embodiment.
Embodiment
In order to describe structure of the present utility model and characteristics place in detail, lift following preferred embodiment now and cooperate graphic explanation as after, wherein:
To shown in Figure 2, a kind of power supply changeover device 10 that reduces idling consumption that the utility model first preferred embodiment is provided is mainly by a direct current power supply 11, one first transformer T as Fig. 1
1, one first electric-controlled switch Q
1, the synchronous rectification circuit of a current sense and converting unit 26, a power controller 31, a detecting voltage and control unit 36, one 41, two MOSFET (metal-oxide half field effect transistor) Q
2, Q
3, and an oscillation circuit 51 form, wherein:
This DC power supply 11 has a positive terminal 12 and a negative pole end 13.
This first transformer T
1, have a primary side N
1An and secondary side N
2
Wherein, this primary side N
1An end be connected in the positive terminal 12 of this DC power supply 11 and this primary side N
1Have: this first electric-controlled switch Q
1, this current sense and converting unit 26, this power controller 31 and this detecting voltage and control unit 36:
This first electric-controlled switch Q
1, have a control end G and be connected in this primary side N
1The other end.This first electric-controlled switch Q
1Be a MOSFET, its control end is grid G, and is connected in this primary side N with its drain D
1, source S then is connected in this current sense and converting unit 26.
This current sense and converting unit 26 have one second transformer T
2And two divider resistance R
1, R
s, the second transformer T
2Primary side N
1An end be connected in this first electric-controlled switch Q
1, the other end then is connected in the negative pole end 13 of this DC power supply 11; This two divider resistance R
1, R
sBe in series, and be parallel to this second transformer T with this tandem compound
2Secondary side N
2This second transformer T
2Secondary side N
2Also has a diode D
1, a resistance R
2, an and capacitor C
1Be in series.This current sense and converting unit 26 detectings are by this first transformer T
1Primary side N
1Through this first electric-controlled switch Q
1The power supply that is transmitted, and be converted to an alternating voltage signal and a direct current voltage signal, and respectively by an AC signal end V
aAn and direct current signal end V
dOutput.Wherein, this two divider resistance R
1, R
sThe node that is connected is this AC signal end V
a, and this resistance R
2With this capacitor C
1The node that connects is this dc signal end V
d
This power controller 31 is a PWM (pulse width modulation) control IC, is connected in this AC signal end V
aAnd this first electric-controlled switch Q
1Control end G.
This detecting voltage and control unit 36 have a comparator 37, and this comparator 37 is connected in this dc signal end V
dAnd has a reference voltage end V
RefBe connected in a reference voltage, the output of this comparator 37 is promptly as a voltage output end 371.This detecting voltage and control unit 36 are this dc signal end of detecting V
dVoltage.
This first transformer T
1Secondary side N
2Have: this circuit of synchronous rectification 41, this two MOSFET Q
2, Q
3, and this oscillation circuit 51.
This circuit of synchronous rectification 41 has a voltage controling end 42 and be connected in this voltage output end 371, and this circuit of synchronous rectification 41 also is connected in power controller 31.
These two MOSFET Q
2, Q
3, be connected and ground connection with source S each other, and this two MOSFET Q
2, Q
3Grid G all be connected in this circuit of synchronous rectification 41, this two MOSFET Q
2, Q
3Drain D then be connected to this secondary side N
2Two ends, this two MOSFET Q
2, Q
3Has an internal body diodes (Body Diode) D respectively
n
These oscillation circuit 51, one end ground connection, the other end is connected in the end of this secondary side N2, and this oscillation circuit 51 is in order to be connected in a load R
o, this oscillation circuit 51 and have and feedback end FB and be connected in this power controller 31.This oscillation circuit 51 is by an inductance L and a capacitor C
oBe in series form this load R
oBe parallel to this capacitor C
o, and this inductance L and this capacitor C
oThe node that connects is promptly feedback as this and is held FB.
The mode of operation of this first embodiment is described as follows:
At this first transformer T
1Primary side N
1Part:
Control this first electric-controlled switch Q by this power controller 31
1Conducting, and this primary side N
1Power supply promptly enter the second transformer T of this current sense and converting unit 26
2Primary side N
1, after transformation, in this second transformer T
2Secondary side N
2Produce power supply, via this AC signal end V
aExport an alternating voltage signal to this power controller 31; And via this diode D
1Rectification, and by this dc signal end V
dExport a direct current voltage signal this comparator 37 to this detecting voltage and control unit 36.
When normal rectification work when heavily loaded pattern (or), this dc signal end V
dThe voltage of direct voltage signal be higher than this reference voltage end V
RefReference voltage, so this circuit of synchronous rectification 41 promptly drives this two MOSFET Q
2, Q
3Carry out work.
When entering the no-load pattern, this dc signal end V
dThe voltage of direct voltage signal drop to and be lower than this reference voltage end V
RefReference voltage the time, the position standard of the voltage output end 371 of this comparator 37 is low, and then this circuit of synchronous rectification 41 is closed this two MOSFET Q
2, Q
3Promptly close, utilize its internal body diodes (Body Diode) D and transfer to
nCarry out rectification, because this moment need not be again to this two MOSFET Q
2, Q
3Drive the energy loss when therefore not driving, the power loss in the time of no-load can being reduced whereby.
Please consult table one and table two again.Table one shows, does not use the current sense of this case and the circuit of converting unit 26 and detecting voltage and control unit 36, has still driven MOSFET Q when no-load
2, Q
3Carry out rectification, it is at 36V
InPower dissipation is still at 5.904W (watt) when (input voltage).And in table two, used the current sense of this case and the circuit of converting unit 26 and detecting voltage and control unit 36, when no-load, used MOSFETQ
2, Q
3Internal body diodes Dn carry out rectification, it is at 36V
InPower dissipation significantly is reduced to 0.864W (watt) when (input voltage).The energy that this shows consume has reduced significantly.
Table one
Table two
Please consult Fig. 3 again, the utility model second preferred embodiment provided a kind of power supply changeover device 60 that reduces idling consumption, take off first embodiment before mainly generally being same as, difference is:
This detecting voltage and control unit 36 except this comparator 37, have more an optical coupling switch 61 and one second electric-controlled switch Q
Set, be a transistor in the present embodiment.The output of this comparator 37 is connected in this optical coupling switch 61.This second electric-controlled switch Q
SetHave a control end B and be connected in this optical coupling switch 61, and have two link E, C is respectively as this voltage output end 371 and ground connection.
Among this second embodiment, utilize this optical coupling switch 61 and this second electric-controlled switch Q
SetAn independently signal controlling mechanism is provided, provides comparatively stable signal to this circuit of synchronous rectification 41.
These all the other structures of second embodiment and mode of operation all generally are same as first embodiment, hold and do not give unnecessary details.
Please consult Fig. 4 again, a kind of power supply changeover device 70 that reduces idling consumption that the utility model the 3rd preferred embodiment is provided is taken off second embodiment before mainly generally being same as, and difference is:
More include one and stablize capacitor C
3, its two ends are connected to the voltage output end 371 of this detecting voltage and control unit 36, in order to stablize the voltage of the signal that this voltage output end 371 exported.The voltage of the signal of output is stablized, made more stable the control of this circuit of synchronous rectification 41.
All the other structures and the mode of operation of this 3rd embodiment all generally are same as second embodiment, hold and do not give unnecessary details.By above-mentioned three embodiment as can be known, the utility model attainable effect be: the power loss of transducer capable of reducing power source under the no-load pattern, and then have effect of saving energy.
Claims (10)
1. the power supply changeover device that can reduce idling consumption is characterized in that, includes:
One direct current power supply has a positive terminal and a negative pole end;
One first transformer has a primary side and a secondary side;
Wherein, an end of this primary side is connected in the positive terminal of this DC power supply, and this primary side has:
One first electric-controlled switch has a control end, and is connected in the other end of this primary side;
One current sense and converting unit, be connected in the negative pole end of this first electric-controlled switch and this DC power supply, the power supply that detecting is transmitted through this first electric-controlled switch by this primary side, and be converted to an alternating voltage signal and a direct current voltage signal, and respectively by an AC signal end and direct current signal end output;
One power controller is connected in the control end of this AC signal end and this first electric-controlled switch;
One detecting voltage and control unit are connected in this dc signal end, detect the voltage of this dc signal end, and this detecting voltage and control unit have a voltage output end;
The secondary side of this first transformer has:
One synchronous rectification circuit has a voltage controling end and is connected in this voltage output end;
Two MOSFET are connected in this circuit of synchronous rectification, and these two MOSFET have an internal body diodes respectively; And
One oscillation circuit, an end ground connection, the other end is connected in an end of this secondary side, and this oscillation circuit is in order to being connected in a load, this oscillation circuit and have and feedback end and be connected in this power controller.
2. the power supply changeover device that reduces idling consumption according to claim 1, it is characterized in that: these two MOSFET, be connected and ground connection with source electrode each other, and the grid of this two MOSFET all is connected in this circuit of synchronous rectification, one drain electrode among these two MOSFET is connected in an end of this secondary side, and the drain electrode of another among these two MOSFET is connected in the other end of this secondary side.
3. the power supply changeover device that reduces idling consumption according to claim 1, it is characterized in that: this first electric-controlled switch is a MOSFET, its control end is grid, and this grid is connected in an end of this primary side with draining, and source electrode then is connected in this current sense and converting unit.
4. the power supply changeover device that reduces idling consumption according to claim 1 is characterized in that: this power controller is a PWM control IC.
5. the power supply changeover device that reduces idling consumption according to claim 1, it is characterized in that: this oscillation circuit by an inductance and an electric capacity be in series the institute form, this load is parallel to this electric capacity, and the node that this inductance is connected with this electric capacity is promptly as this back coupling end.
6. the power supply changeover device that reduces idling consumption according to claim 1, it is characterized in that: this current sense and converting unit have one second transformer and two divider resistances, one end of the primary side of this second transformer is connected in this first electric-controlled switch, and the other end then is connected in the negative pole end of this DC power supply; These two divider resistances are in series, and are parallel to the secondary side of this second transformer with this tandem compound, and the node that this two divider resistance is connected is promptly as this AC signal end; In addition, the secondary side of this second transformer also has a diode, a resistance and an electric capacity and is in series, and the node that this resistance is connected with this electric capacity is promptly as this dc signal end.
7. the power supply changeover device that reduces idling consumption according to claim 1, it is characterized in that: this detecting voltage and control unit, has a comparator, this comparator is connected in this dc signal end and has a reference voltage end and is connected in a reference voltage, the output of this comparator is promptly as this voltage output end, and this circuit of synchronous rectification is connected in this power controller.
8. the power supply changeover device that reduces idling consumption according to claim 1, it is characterized in that: this detecting voltage and control unit, have a comparator and an optical coupling switch and one second electric-controlled switch, this comparator is connected in this dc signal end and has a reference voltage end and is connected in a reference voltage, and the output of this comparator is connected in this optical coupling switch; This second electric-controlled switch has a control end and is connected in this optical coupling switch, and has two links respectively as this voltage output end and ground connection.
9. the power supply changeover device that reduces idling consumption according to claim 8 is characterized in that: this second electric-controlled switch of this detecting voltage and control unit is a transistor.
10. the power supply changeover device that reduces idling consumption according to claim 8 is characterized in that: more include one and stablize electric capacity, its two ends are connected to this voltage output end and ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201788469U CN201781416U (en) | 2009-09-08 | 2009-09-08 | Power converter capable of reducing standby loss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201788469U CN201781416U (en) | 2009-09-08 | 2009-09-08 | Power converter capable of reducing standby loss |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201781416U true CN201781416U (en) | 2011-03-30 |
Family
ID=43794618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201788469U Expired - Fee Related CN201781416U (en) | 2009-09-08 | 2009-09-08 | Power converter capable of reducing standby loss |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201781416U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102969912A (en) * | 2012-10-23 | 2013-03-13 | 矽力杰半导体技术(杭州)有限公司 | Control and drive circuit and method |
| CN103872885A (en) * | 2014-03-18 | 2014-06-18 | 深圳市华星光电技术有限公司 | Standby power consumption control circuit and method |
| CN104917390A (en) * | 2015-05-16 | 2015-09-16 | 常德立欣电子科技股份有限公司 | Special switching transformer for computer |
| TWI580162B (en) * | 2015-05-25 | 2017-04-21 | 立錡科技股份有限公司 | Power converter and control circuit and standby power saving method thereof |
| WO2017128773A1 (en) * | 2016-01-29 | 2017-08-03 | 南通米兰特电气有限公司 | Hibernation control method and structure for control transformer |
| CN107134922A (en) * | 2017-07-05 | 2017-09-05 | 郑州万用电子科技有限公司 | A kind of change-over circuit of instrument power supply |
| CN111830424A (en) * | 2019-03-29 | 2020-10-27 | 捷拓科技股份有限公司 | Load state detection device |
-
2009
- 2009-09-08 CN CN2009201788469U patent/CN201781416U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102969912A (en) * | 2012-10-23 | 2013-03-13 | 矽力杰半导体技术(杭州)有限公司 | Control and drive circuit and method |
| CN102969912B (en) * | 2012-10-23 | 2014-08-13 | 矽力杰半导体技术(杭州)有限公司 | Control and drive circuit and method |
| CN103872885A (en) * | 2014-03-18 | 2014-06-18 | 深圳市华星光电技术有限公司 | Standby power consumption control circuit and method |
| CN103872885B (en) * | 2014-03-18 | 2016-04-06 | 深圳市华星光电技术有限公司 | A kind of standby power consumption control circuit and method |
| CN104917390A (en) * | 2015-05-16 | 2015-09-16 | 常德立欣电子科技股份有限公司 | Special switching transformer for computer |
| TWI580162B (en) * | 2015-05-25 | 2017-04-21 | 立錡科技股份有限公司 | Power converter and control circuit and standby power saving method thereof |
| WO2017128773A1 (en) * | 2016-01-29 | 2017-08-03 | 南通米兰特电气有限公司 | Hibernation control method and structure for control transformer |
| CN107134922A (en) * | 2017-07-05 | 2017-09-05 | 郑州万用电子科技有限公司 | A kind of change-over circuit of instrument power supply |
| CN107134922B (en) * | 2017-07-05 | 2023-10-31 | 郑州工业应用技术学院 | Conversion circuit of power supply for instrument |
| CN111830424A (en) * | 2019-03-29 | 2020-10-27 | 捷拓科技股份有限公司 | Load state detection device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110330 Termination date: 20180908 |
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| CF01 | Termination of patent right due to non-payment of annual fee |