CN102468767A - Power supply circuit - Google Patents
Power supply circuit Download PDFInfo
- Publication number
- CN102468767A CN102468767A CN2010105416015A CN201010541601A CN102468767A CN 102468767 A CN102468767 A CN 102468767A CN 2010105416015 A CN2010105416015 A CN 2010105416015A CN 201010541601 A CN201010541601 A CN 201010541601A CN 102468767 A CN102468767 A CN 102468767A
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- Prior art keywords
- circuit
- output voltage
- order
- voltage
- standby power
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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 power supply circuit, which comprises a first-stage circuit for converting input voltage into direct voltage, and a second stage circuit, wherein the second stage circuit comprises a main power switching circuit for converting the direct voltage into first output voltage, a first standby power switching circuit for converting the direct voltage into second output voltage, a feedback circuit for connecting the main power switching circuit and the first standby power switching circuit to generate a feedback signal according to the first and second output voltage so as to make the first standby power switching circuit adjust the second output voltage according to the feedback signal, a second standby power switching circuit for converting the first output voltage or the second output voltage into a standby power, and a power distribution circuit for outputting the first output voltage or the second output voltage to the second standby power switching circuit.
Description
Technical field
The present invention relates to a kind of power supply circuit, relate in particular to a kind of power supply circuit that standby power is provided.
Background technology
Electronics technology is more and more progressive now; It is complicated that the electronic product internal structure also becomes, and in order to meet the hommization demand more, the inner standing standby power that has of electronic product; To continue supply and the operation of keeping the internal system subelement; For example when indication of time showing, power supply status and start in order to drive system in advance etc., therefore, standby power becomes the indispensable part of electronic product now already.
See also Fig. 1, it provides the circuit block diagram of the power supply circuit of standby power for tradition.As shown in the figure; This power supply circuit 1 is a secondary circuit; It comprises first order circuit 11 and second level circuit 12; Wherein first order circuit 11 comprises electromagnetic interference filter unit (EMI Unit) 111 and power factor correction unit (PFC Unit) 112, converts direct voltage VDC into and exports second level circuit 12 in order to the alternating current VAC with input.Circuit 12 inside in the second level comprise main power source transducer 121 and flyback power converter 122; Wherein main power source transducer 121 frameworks are in when circuit system moves; Converting into direct voltage VDC for example, the operation power supply Vo of 12V voltage uses to be supplied to circuit system; Whether open no matter flyback power converter 122 then is a circuit system, all can convert direct voltage VDC into the for example standby power Vsb of 5V, with the element that drives with standby power in the driving system circuit.Yet though this known technology can provide stable standby power, the conversion usefulness of flyback power converter 122 is not good, with making that the loss of power of whole power supply circuit 1 is excessive.
Therefore, how to develop a kind of power supply circuit that solves above-mentioned known technology defective, real in pressing for the problem of solution at present.
Summary of the invention
Main purpose of the present invention is to provide a kind of power supply circuit, and is not good with the conversion usefulness that solves the direction flyback converter that known power supply circuit comprised, and makes the excessive problem of the loss of power of whole power supply circuit.
Another object of the present invention is to provide a kind of power supply circuit, can reduce the loss of power and reach the effect that promotes operation usefulness.
For reaching above-mentioned purpose, of the present invention one than the broad sense execution mode for a kind of power supply circuit is provided, comprising: first order circuit, in order to convert input voltage into direct voltage; And second level circuit, be connected with first order circuit, comprise at least: main power conversion circuit is connected with first order circuit, in order to direct voltage is converted into first output voltage; The first standby power change-over circuit is connected with first order circuit, in order to direct voltage is converted into second output voltage; Feedback circuit; Be connected with the main power conversion circuit and the first standby power change-over circuit; In order to produce a feedback signal, make the first standby power change-over circuit adjust the magnitude of voltage of second output voltage according to feedback signal according to first output voltage and second output voltage; The second standby power change-over circuit is in order to convert first output voltage or second output voltage into a standby power; And power distribution circuit, be connected with main power conversion circuit, the first standby power change-over circuit and the second standby power change-over circuit, in order to select exporting first output voltage or second output voltage to second standby power change-over circuit.
For reaching above-mentioned purpose, of the present invention another than the broad sense execution mode for a kind of power supply circuit is provided, comprising: first order circuit, in order to convert input voltage into direct voltage; And second level circuit, be connected with first order circuit, comprise at least: main power conversion circuit is connected with first order circuit, in order to direct voltage is converted into first output voltage; The first standby power change-over circuit is connected with first order circuit, in order to direct voltage is converted into second output voltage; Feedback circuit; Be connected with the main power conversion circuit and the first standby power change-over circuit; In order to produce feedback signal to the first a standby power change-over circuit, make the first standby power change-over circuit adjust the magnitude of voltage of second output voltage according to feedback signal according to first output voltage and second output voltage; The second standby power change-over circuit is in order to convert first output voltage or second output voltage into a standby power; And power distribution circuit, be connected with main power conversion circuit, the first standby power change-over circuit and the second standby power change-over circuit, in order to select exporting first output voltage or second output voltage to second standby power change-over circuit.Wherein, when main power conversion circuit was exported first output voltage, the second standby power change-over circuit converted first out-put supply into standby power through power distribution circuit; And when main power conversion circuit stopped to export first output voltage, the second standby power change-over circuit converted second output voltage into standby power through power distribution circuit.
Description of drawings
Fig. 1: it is the known circuit block diagram that the power supply circuit of standby power is provided.
Fig. 2: it is the circuit block diagram of the power supply circuit of preferred embodiment of the present invention.
Description of reference numerals in the above-mentioned accompanying drawing is following:
Power supply circuit: 1,2 power factor correction unit: 112,212
First order circuit: 11,21 main power conversion circuit: 221
Second level circuit: 12,22 first standby power change-over circuits: 222
Main power source transducer: 121 feedback circuits: 223
Flyback power converter: 122 second standby power change-over circuits: 224
Em filtering interference units: 211,111 power distribution circuits: 225
Input voltage: V
InInput current: I
In
Direct voltage: V
DCOperation power supply: V
o
First output voltage: V
o1 second output voltage: V
O2
Standby power: V
SbFirst resistance: R
1
Second resistance: R
2The 3rd resistance: R
3
First diode: D
1Second diode: D
2
The 3rd diode: D
3Electric capacity: C
Feedback signal V
fAlternating current: V
AC
Embodiment
Some exemplary embodiments that embody characteristic of the present invention and advantage will be described in detail in the explanation of back segment.Be understood that the present invention can have various variations on different modes, it does not depart from the scope of the present invention, and explanation wherein and accompanying drawing be used as the usefulness of explanation in itself, but not in order to restriction the present invention.
See also Fig. 2, it is the circuit block diagram of the power supply circuit of preferred embodiment of the present invention.As shown in Figure 2, power supply circuit 2 of the present invention comprises first order circuit 21 and second level circuit 22.First order circuit 21 is in order to input voltage V
InConvert direct voltage V into
DCAnd export second level circuit 22 to.In present embodiment, first order circuit 21 can comprise electromagnetic interference filter unit (EMI Unit) 211 and power factor correction unit (PFC Unit) 212, and wherein power factor correction unit 212 usefulness are so that input current I
InThe approximate input voltage V of CURRENT DISTRIBUTION
InSinusoidal waveform, to increase power factor, electromagnetic interference filter unit 211 is then in order to filtering input voltage V
InHigh-frequency noise so that input current I
InWave mode level and smooth.
Please consult Fig. 2 again; Second level circuit 22 comprises main power conversion circuit 221, the first standby power change-over circuit 222, feedback circuit 223, the second standby power change-over circuit 224 and power distribution circuit 225; Wherein, main power conversion circuit 221 electrically connects with first order circuit 21.When the circuit system (not shown) that is connected with power supply circuit 2 of the present invention moved, main power conversion circuit 221 can be with direct voltage V
DCConvert first output voltage V to
O112V for example, and export circuit system to.The first standby power change-over circuit 222 also electrically connects with first order circuit 21, and with direct voltage V
DCConvert second output voltage V to
O2, for example 12V, and inside is provided with a reference voltage V
Ref(not shown).
The feedback circuit 223 and the first standby power change-over circuit 222 and main power conversion circuit 221 electrically connects, in order to according to first output voltage V
O1And second output voltage V
O2And produce a feedback signal V
f, and then make the first standby power change-over circuit 222 according to this second output voltage V of this feedback signal Vf adjustment
O2Magnitude of voltage.In present embodiment, feedback circuit 223 can comprise first resistance R
1, second resistance R
2And the first diode D
1, and first resistance R wherein
1An end be connected to the output of the first standby power change-over circuit 222, first resistance R
1And second resistance R
2Framework is a bleeder circuit with to first output voltage V
O1And second output voltage V
O2Carry out dividing potential drop, and then export this feedback signal V
f, the first diode D
1Then in order to the restriction sense of current.In some embodiment, feedback circuit 223 more can have the 3rd resistance R
3Reach capacitor C, be connected in the output and the first diode D of main power conversion circuit 221
1Between, in order to work as first output voltage V
O1During variation, delayed feedback signal V
fModulating time.
The second standby power change-over circuit 224 can be in order to this first output voltage V
O1Or this second output voltage V
O2Convert a standby power V into
SbPower distribution circuit 225 is connected with main power conversion circuit 221, the first standby power change-over circuit 222 and the second standby power change-over circuit 224, in present embodiment, can comprise the second diode D
2And the 3rd diode D
3, the second diode D wherein
2Anode tap be connected with main power conversion circuit 221, the second diode D
2Cathode terminal and the 3rd diode D
3Cathode terminal connect and the 3rd diode D
3Anode tap be connected with the first standby power change-over circuit 222, in order to first optionally that magnitude of voltage is the higher relatively output voltage V
O1Or second output voltage V
O2Be passed to the second standby power change-over circuit 224.
Please consult Fig. 2 again, the operation logic of power supply circuit 2 of the present invention below will be described, as input voltage V
InBehind the input first order circuit 21, promptly pass through electromagnetic interference filter unit 211 and power factor correction unit 212 with input voltage V
InConvert direct voltage V into
DCAnd export second level circuit 22 to.When the circuit system that is connected with power supply circuit 2 moved, main power conversion circuit 221 can be with direct voltage V
DCConvert the first required output voltage V of circuit system into
O1, 12V for example, and though the first standby power change-over circuit 222 then circuit system whether move, all can be with direct voltage V
DCConvert second output voltage V into
O2, 12V for example.When circuit system moved, feedback circuit 223 can be according to first output voltage V
O1And second output voltage V
O2Magnitude of voltage and produce feedback signal V
f, the first standby power change-over circuit 222 is according to feedback signal V
fWith reference voltage V
RefAdjust second output voltage V
O2Magnitude of voltage, make feedback signal V
fEqual reference voltage V
Ref, in present embodiment, reference voltage V
RefWith feedback signal V
fPredeterminablely be for example 2.5V, so when circuit system operation and the first higher output voltage V
O1Make the feedback signal V of feedback circuit 223 outputs
fWhen being higher than 2.5V, at this moment, the control circuit (not shown) of the first standby power change-over circuit, 222 inside is in order to make reference voltage V
RefEqual feedback signal V
f, can adjust second output voltage V
O2Magnitude of voltage, also be about to second output voltage V
O2Be adjusted into for example 9V downwards by 12V, thus, first output voltage V
O1Magnitude of voltage will be higher than second output voltage V
O2Magnitude of voltage, so the second diode D of power distribution circuit 225
2Conducting is made first output voltage V
O1Be sent to the second standby power change-over circuit 224, to convert standby power V to
SbOutput.Because the operational efficiency of main power conversion circuit 221 is higher with respect to the first standby power change-over circuit 222, thus when circuit system moves, by main power conversion circuit 221 as standby power V
SbThe source can significantly improve power supply operation usefulness, and second output voltage V
O2Promptly form a non-loaded loop circuit.
And when circuit system does not move, stop direct voltage V like main power conversion circuit 221
DCConvert first output voltage V into
O1Or stop to export first output voltage V
O1So magnitude of voltage is about zero first output voltage V
O1Can make feedback circuit 223 only according to second output voltage V
O2For example 9V produces the feedback signal V that is lower than 2.5V
f, at this moment, the control circuit of the first standby power change-over circuit, 222 inside is in order to make reference voltage V
RefEqual feedback signal V
f, can adjust second output voltage V
O2Magnitude of voltage, make second output voltage V
O2Adjust upward by 9V and to be for example 12V, second output voltage V
O2Magnitude of voltage be higher than first output voltage V
O1Magnitude of voltage, so the 3rd diode D of power distribution circuit 225
3Conducting is made second output voltage V
O2Be sent to the second standby power change-over circuit 224, to convert standby power V to
SbOutput.
In sum; Power supply circuit of the present invention receives first output voltage of main power conversion circuit output and second output voltage of the first standby power change-over circuit through feedback circuit; And produce a feedback signal according to first output voltage and second output voltage; Make the first standby power change-over circuit adjust the magnitude of voltage of second output voltage according to feedback signal; Select to export first output voltage or second output voltage to second standby power change-over circuit through power distribution circuit again; Make when circuit system moves with the source of the good main power conversion circuit of conversion efficiency, to promote the power supply operation usefulness of power supply circuit as standby power.
The present invention must be appointed by those skilled in the art and executes that the craftsman thinks and be to modify as all, yet does not take off as attaching the scope of claim institute desire protection.
Claims (10)
1. power supply circuit comprises:
One first order circuit is in order to convert an input voltage into one direct current voltage; And
One second level circuit is connected with this first order circuit, comprises at least:
One main power conversion circuit is connected with this first order circuit, in order to this direct voltage is converted into one first output voltage;
One first standby power change-over circuit is connected with this first order circuit, in order to this direct voltage is converted into one second output voltage;
One feedback circuit; Be connected with this main power conversion circuit and this first standby power change-over circuit; In order to produce a feedback signal, make the magnitude of voltage of this first standby power change-over circuit according to this this second output voltage of feedback signal adjustment according to this first output voltage and this second output voltage;
One second standby power change-over circuit is in order to convert this first output voltage or this second output voltage into a standby power; And
One power distribution circuit is connected with this main power conversion circuit, this first standby power change-over circuit and this second standby power change-over circuit, in order to select exporting this first output voltage or this second output voltage to this second standby power change-over circuit.
2. power supply circuit as claimed in claim 1, wherein this first order circuit comprises:
One power factor correction unit is used so that the CURRENT DISTRIBUTION of an input current is similar to the sinusoidal waveform of this input voltage; And
One electromagnetic interference filter unit in order to the high-frequency noise of this input voltage of filtering, makes the wave mode of this input current level and smooth.
3. power supply circuit as claimed in claim 1, wherein this first standby power change-over circuit inside is provided with a reference voltage, and this first standby power change-over circuit is adjusted the magnitude of voltage of this second output voltage according to this feedback signal and this reference voltage.
4. power supply circuit as claimed in claim 1, wherein this feedback circuit has one first resistance and one second resistance, in order to this first output voltage and this second output voltage are carried out dividing potential drop.
5. power supply circuit as claimed in claim 4, wherein this feedback circuit has one the 3rd resistance and an electric capacity, when being used to this first output voltage variation, the modulating time that postpones this feedback signal.
6. like claim 4 or 5 described power supply circuits, wherein this feedback circuit has more one first diode, in order to the restriction sense of current.
7. power supply circuit comprises:
One first order circuit is in order to convert an input voltage into one direct current voltage; And
One second level circuit is connected with this first order circuit, comprises at least:
One main power conversion circuit is connected with this first order circuit, in order to this direct voltage is converted into one first output voltage;
One first standby power change-over circuit is connected with this first order circuit, in order to this direct voltage is converted into one second output voltage;
One feedback circuit; Be connected with this main power conversion circuit and this first standby power change-over circuit; In order to produce a feedback signal to this first standby power change-over circuit, make the magnitude of voltage of this first standby power change-over circuit according to this this second output voltage of feedback signal adjustment according to this first output voltage and this second output voltage;
One second standby power change-over circuit is in order to convert this first output voltage or this second output voltage into a standby power; And
One power distribution circuit is connected with this main power conversion circuit, this first standby power change-over circuit and this second standby power change-over circuit, in order to select exporting this first output voltage or this second output voltage to this second standby power change-over circuit;
Wherein, when this this first output voltage of main power conversion circuit output, this second standby power change-over circuit converts this first out-put supply into this standby power through this power distribution circuit; And when this main power conversion circuit stopped to export this first output voltage, this second standby power change-over circuit converted this second output voltage into this standby power through this power distribution circuit.
8. power supply circuit as claimed in claim 7, wherein this first standby power change-over circuit inside is provided with a reference voltage, and this first standby power change-over circuit is adjusted the magnitude of voltage of this second output voltage according to this feedback signal and this reference voltage.
9. power supply circuit as claimed in claim 7, wherein this feedback circuit has one first resistance and one second resistance, in order to this first output voltage and this second output voltage are carried out dividing potential drop.
10. power supply circuit as claimed in claim 9, wherein this feedback circuit more comprises:
One the 3rd resistance and an electric capacity, when being used to this first output voltage variation, the modulating time that postpones this feedback signal; And
One first diode is in order to the restriction sense of current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010541601.5A CN102468767B (en) | 2010-11-08 | 2010-11-08 | Power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010541601.5A CN102468767B (en) | 2010-11-08 | 2010-11-08 | Power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102468767A true CN102468767A (en) | 2012-05-23 |
| CN102468767B CN102468767B (en) | 2015-01-28 |
Family
ID=46072034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010541601.5A Active CN102468767B (en) | 2010-11-08 | 2010-11-08 | Power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102468767B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104980049A (en) * | 2014-04-01 | 2015-10-14 | 群光电能科技股份有限公司 | Power feedback device and power feedback method |
| CN110120740A (en) * | 2018-02-07 | 2019-08-13 | 青岛海信电器股份有限公司 | A kind of DC-DC variable voltage output circuit and terminal installation |
| CN110635678A (en) * | 2018-06-25 | 2019-12-31 | 青岛海信电器股份有限公司 | DC-DC variable voltage output circuit and terminal device |
| CN113630022A (en) * | 2021-08-26 | 2021-11-09 | 深圳市瑞声元科技有限公司 | ATX power supply control circuit and ATX power supply device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6661119B2 (en) * | 2001-12-17 | 2003-12-09 | Cloudshield Technologies, Inc. | System and method for distributed power supply supporting high currents with redundancy |
| EP1376836A2 (en) * | 2002-06-25 | 2004-01-02 | Alcatel Canada Inc. | Quick-start DC-DC converter circuit and method |
| TW200622543A (en) * | 2004-12-29 | 2006-07-01 | Delta Electronics Inc | Power supply device and single photo-coupler control circuit thereof |
| US20080169703A1 (en) * | 2007-01-12 | 2008-07-17 | Lg Electronics Inc. | Apparatus and method for managing power of mobile terminal |
| US20080211312A1 (en) * | 2007-01-29 | 2008-09-04 | Innocom Technology (Shenzhen) Co., Ltd. | Multiplexed direct current regulation output circuit having balance control circuit |
| CN201577034U (en) * | 2009-04-21 | 2010-09-08 | 冠捷投资有限公司 | Distributed power supply |
-
2010
- 2010-11-08 CN CN201010541601.5A patent/CN102468767B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6661119B2 (en) * | 2001-12-17 | 2003-12-09 | Cloudshield Technologies, Inc. | System and method for distributed power supply supporting high currents with redundancy |
| EP1376836A2 (en) * | 2002-06-25 | 2004-01-02 | Alcatel Canada Inc. | Quick-start DC-DC converter circuit and method |
| TW200622543A (en) * | 2004-12-29 | 2006-07-01 | Delta Electronics Inc | Power supply device and single photo-coupler control circuit thereof |
| US20080169703A1 (en) * | 2007-01-12 | 2008-07-17 | Lg Electronics Inc. | Apparatus and method for managing power of mobile terminal |
| US20080211312A1 (en) * | 2007-01-29 | 2008-09-04 | Innocom Technology (Shenzhen) Co., Ltd. | Multiplexed direct current regulation output circuit having balance control circuit |
| CN201577034U (en) * | 2009-04-21 | 2010-09-08 | 冠捷投资有限公司 | Distributed power supply |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104980049A (en) * | 2014-04-01 | 2015-10-14 | 群光电能科技股份有限公司 | Power feedback device and power feedback method |
| CN104980049B (en) * | 2014-04-01 | 2017-08-25 | 群光电能科技股份有限公司 | Electric power feedback device and electric power feedback method |
| CN110120740A (en) * | 2018-02-07 | 2019-08-13 | 青岛海信电器股份有限公司 | A kind of DC-DC variable voltage output circuit and terminal installation |
| CN110635678A (en) * | 2018-06-25 | 2019-12-31 | 青岛海信电器股份有限公司 | DC-DC variable voltage output circuit and terminal device |
| CN113630022A (en) * | 2021-08-26 | 2021-11-09 | 深圳市瑞声元科技有限公司 | ATX power supply control circuit and ATX power supply device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102468767B (en) | 2015-01-28 |
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