CN102130588B - Power supply device - Google Patents
Power supply device Download PDFInfo
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- CN102130588B CN102130588B CN 201010004204 CN201010004204A CN102130588B CN 102130588 B CN102130588 B CN 102130588B CN 201010004204 CN201010004204 CN 201010004204 CN 201010004204 A CN201010004204 A CN 201010004204A CN 102130588 B CN102130588 B CN 102130588B
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Abstract
The invention provides a power supply device. The power supply device comprises two groups of power suppliers which are connected in parallel and used for simultaneously supplying power required by running of an electronic product. The power supply device can output expected direct-current output voltage to the electronic product stably/precisely, and raise main power generated in one group of power suppliers in advance when the other group of power suppliers have overvoltage, thereby avoiding overlarge voltage reduction of the direct-current output voltage.
Description
Technical field
The present invention relates to a kind of power supply device, and be particularly related to and a kind ofly have outside overvoltage compensation and detect the power supply device of Compensation Feedback function with/differential pressure.
Background technology
In the application of some high-order electronic product (for example server, industrial computer), often power supply unit (power supplier) two groups of specifications is identical and that have a negative feedback control function connects together, with this required electric power (electric power) during the supplies electrons product operation while.When wherein one group of power supply unit takes place to lose efficacy because of overvoltage (over voltage), then utilize another group power supply unit to continue supply electric power and use to electronic product.
In actual applications, when one group of power supply unit overvoltage wherein, when perhaps the feedback of two groups of power supply units has deviation, because negative feedback control is, the work period of the control signal that the voltage feedback controller of this group power supply unit inside produces can be carried out corresponding reduction, but under reduction situation to the utmost point, this group power supply unit will lose efficacy.At this moment, because the load aggravation of another group power supply unit is many, excessive voltage drop (voltage drop) takes place in the electric power that probably can cause this group power supply unit to supply.If this electric power drops to the minimum power specification of electronic product suddenly when following, then probably can cause electronic product not have the shutdown of early warning, perhaps can cause electronic system instability very.
Summary of the invention
In view of this, the invention provides a kind of power supply device, it is solved the problem that prior art is addressed.
Other purposes of the present invention and advantage can be further understood from the disclosed technical characterictic of the present invention.
For reaching one of above-mentioned or partly or all purposes or other purposes, power supply device provided by the present invention comprises first group of power supply unit, in order to receiving a direct current input voltage, and produces a direct current output voltage according to this.This first group of power supply unit comprises main power source generation unit, isolating diode, first resistance, voltage feedback controller, and pressure reduction detects the unit.Wherein, the main power source generation unit produces a main power source according to this in order to receive and to change described DC input voitage.Isolating diode connects the main power source generation unit, and its anode is in order to receive described main power source, and its negative electrode is then in order to export described VD.
First end of first resistance connects the anode of isolating diode.Voltage feedback controller connects second end and the main power source generation unit of first resistance, in order to the voltage according to second end of first resistance, provides control signal with control main power source generation unit, thereby regulates described main power source.Pressure reduction detects the unit and connects the negative electrode of isolating diode and second end of first resistance, voltage in order to second end of the voltage of the negative electrode of isolating diode relatively and first resistance, the voltage of controlling second end of first resistance according to this is constantly equal to the voltage of the negative electrode of isolating diode, thereby makes the group power supply unit of winning stably export described VD.
In one embodiment of this invention, power supply device also comprises second group of power supply unit, in order to receiving described DC input voitage, and produces described VD according to this.Wherein, first group with second group of power supply unit the VD system that produces out of the ordinary be supplied to a load to use simultaneously.With this understanding, first group of power supply unit comprises that also overvoltage detects the unit, connect the negative electrode of isolating diode and second end of first resistance, in order to when second group of power supply unit overvoltage, drag down the voltage of second end of first resistance, increase the work period of described control signal according to this, thereby promote described main power source.
Based on as can be known above-mentioned, power supply device proposed by the invention utilizes pressure reduction to detect the unit, voltage with second end of controlling first resistance is constantly equal to the voltage of the negative electrode of isolating diode, uses for load (for example high-order such as server, industrial computer electronic product) thereby make the group power supply unit of winning stably/accurately export desired VD.In addition, power supply device proposed by the invention also utilizes overvoltage to detect the unit, with when second group of power supply unit overvoltage, the main power source that the prior main power source generation unit that promotes first group of power supply unit produces, thereby the VD that the group power supply unit of winning is produced does not cause excessive voltage drop because load aggravates (when namely second group of power supply unit lost efficacy because of overvoltage), and is guaranteed to be not less than the minimum power specification of electronic product.
For above-mentioned feature and advantage of the present invention can be become apparent, a plurality of embodiment cited below particularly, and conjunction with figs. are described in detail below, but above-mentioned general description and following execution mode only are exemplary and illustrative, and it can not limit the scope that institute of the present invention desire is advocated.
Description of drawings
Fig. 1 is the schematic diagram of the power supply device of one embodiment of the invention;
Fig. 2 is the calcspar of first group of power supply unit of one embodiment of the invention;
Fig. 3 is the circuit diagram of first group of power supply unit of one embodiment of the invention;
Fig. 4 is the circuit diagram of first group of power supply unit of another embodiment of the present invention.
Main element symbol description in the accompanying drawing:
The 100-power supply device; First group of power supply unit of 101-;
Second group of power supply unit of 103-; 105-load, server;
201-main power source generation unit; The 203-voltage feedback controller;
205-pressure reduction detects the unit; The 207-overvoltage detects the unit;
The D1-isolating diode; D2, D3-diode;
R1～R4-first resistance to the four resistance; The CP-comparator;
The OP-operational amplifier; The ZD-Zener diode;
T-NPN type bipolar transistor; The L-inductance;
C-electric capacity; The SW-switch;
The CS-control signal; The MP-main power source;
VB, VC-voltage; The Vin-DC input voitage;
The Vout-VD; The GND-earthing potential.
Embodiment
About aforementioned and other technology contents, characteristics and effect of the present invention, in the detailed description of a plurality of embodiment of following conjunction with figs., can clearly present.In addition, showing will be in detail with reference to embodiments of the invention, and the example of described embodiment is described in the accompanying drawings.Moreover all possibility parts use element/member of same numeral to represent identical or similar portions in drawings and the embodiments.
Fig. 1 is the schematic diagram of the power supply device of one embodiment of the invention.Please refer to Fig. 1, power supply device 100 comprises two groups of power supply units with negative feedback control function: first group of power supply unit 101 and second group of power supply unit 103.In the present embodiment, first group of power supply unit 101 and second group of power supply unit 103 connect together, and respectively in order to receive DC input voitage Vin, and produce VD Vout according to this and use (server for example for load 105, but be not restricted to this, below rename as load 105 and be server 105).In other words, first group of power supply unit 101 and second group of power supply unit 103 are electric power required when supplying server 105 runnings simultaneously.
The content that discloses from prior art as can be known, when second group of power supply unit 103 overvoltage, (its reason that causes might be the error of first group of power supply unit 101 and second group of power supply unit 103 internal feedback part when perhaps the feedback of first group of power supply unit 101 and second group of power supply unit 103 had deviation, that is: the error of resistance), because negative feedback control is, the work period of the control signal that the voltage feedback controller (not shown) of second group of power supply unit 103 inside produces can be carried out corresponding reduction, but under reduction situation to the utmost point, second group of power supply unit 103 will lose efficacy.In the present embodiment, though this moment, the load aggravation of first group of power supply unit 101 was many, but excessive voltage drop can't take place in the VD Vout that first group of power supply unit 101 produces, and is maintained more than the minimum power specification of server 105.Thus, present embodiment is namely solved the problem that prior art is addressed.
Clearer, Fig. 2 is the calcspar of first group of power supply unit of one embodiment of the invention, and Fig. 3 is the circuit diagram of first group of power supply unit of one embodiment of the invention.Please merge with reference to Fig. 1～Fig. 3, first group of power supply unit 101 comprises that main power source generation unit 201, isolating diode D1, first resistance R 1, voltage feedback controller 203, pressure reduction detect unit 205, and overvoltage detects unit 207.
In the present embodiment, main power source generation unit 201 is DC-DC transducer (DC-to-DCconverter), for example be buck converter (bulk converter), but be not restricted to this, booster type and the buck converter of all the other isolated forms or non-isolation type all can.Main power source generation unit 201 produces main power source MP in order to receive and conversion DC input voitage Vin with this.
Isolating diode D1 connects main power source generation unit 201, and its anode (anode) is in order to receive main power source MP, and its negative electrode (cathode) is then in order to export VD Vout.First end of first resistance R 1 connects the anode of isolating diode D1.Voltage feedback controller 203 connects second end and the main power source generation unit 201 of first resistance R 1, in order to the voltage VC according to second end of first resistance R 1, provide control signal CS with control main power source generation unit 201, thereby regulate (for example promoting or reduction) main power source MP.
What deserves to be mentioned is earlier at this, in other embodiments of the invention, also can utilize the parasitic diode of mos field effect transistor (hereinafter to be referred as MOSFET) to realize the effect of isolating diode D1.Thus, only need to set up a controlling mechanism in first group of power supply unit 101 gets final product with opening or closing of MOSFET of control more.
Pressure reduction detects unit 205 and connects the negative electrode of isolating diode D1 and second end of first resistance R 1, voltage VC in order to second end of the voltage VB of the negative electrode of isolating diode D1 relatively and first resistance R 1, be constantly equal to the voltage VB of the negative electrode of isolating diode D1 with this voltage VC that controls second end of first resistance R 1, thereby make the group power supply unit 101 of winning stably/accurately export VD Vout.Overvoltage detects unit 207 and connects the negative electrode of isolating diode D1 and second end of first resistance R 1, in order to when second group of power supply unit 103 overvoltage, drag down the voltage VC of second end of first resistance R 1, increase the work period of control signal CS with this, thereby promote main power source MP.
In the present embodiment, main power source generation unit 201 comprises switch SW, diode D2, inductance L, and capacitor C.Wherein, switch SW is utilized MOS transistor to realize, and its first end is in order to receive DC input voitage Vin, and its control end is then in order to receive control signal CS.The anode of diode D2 is connected to earthing potential GND, and the negative electrode of diode D2 then connects second end of switch SW.First end of inductance L connects second end of switch SW, and second end of inductance L then connects first end of first resistance R 1 to produce main power source MP.First end of capacitor C connects second end of inductance L, and second end of capacitor C then is connected to earthing potential GND.
Pressure reduction detects unit 205 and comprises comparator (comparator) CP and second resistance R 2.Wherein, the positive input terminal (+) of comparator C P connects the negative electrode of isolating diode D1, and the negative input end (-) of comparator C P then connects second end of first resistance R 1.First end of second resistance R 2 connects the output of comparator C P, and second end of second resistance R 2 then connects second end of first resistance R 1.
In the present embodiment, during as if second group of power supply unit 103 overvoltage, Zener diode ZD can conducting.In other words, the Zener diode ZD of present embodiment only can be when second group of power supply unit 103 overvoltage and conducting.At this moment, because bipolar npn transistor npn npn T also can conducting, to such an extent as to the voltage VC of second end of first resistance R 1 can be dragged down, thereby increase work period of the control signal CS that voltage feedback controller 203 provides, promote the main power source MP that main power source generation unit 201 is produced with this.
Also because of like this, when second group of power supply unit 103 lost efficacy because of overvoltage, the VD Vout that first group of power supply unit 101 produces can't cause excessive voltage drop (the main power source MP that produces because of main power source generation unit 201 was raised in advance) because of the load aggravation before second group of power supply unit 103 loses efficacy, thereby the VD Vout that the group power supply unit 101 of winning was produced in this moment can also maintain the minimum power specification that is not less than server 105, avoid/prevent server 105 from the shut down event of no early warning taking place with this, perhaps avoid/prevent the system of server 105 from unsettled phenomenon taking place.
On the other hand, use for server 105 in order to make the group power supply unit 101 of winning stably/accurately export VD Vout.When the output current of first group of power supply unit 101 increases (when load increases the weight of), the voltage VB of the negative electrode of isolating diode D1 also can and then descend, but because comparator C P can compare the voltage VC of second end of the voltage VB of negative electrode of isolating diode D1 and first resistance R 1, so when the voltage VB of the negative electrode of isolating diode D1 descends, the output of comparator C P also can drag down the voltage VC of second end of first resistance R 1, cause the voltage VC of second end of first resistance R 1 to be constantly equal to the voltage VB of the negative electrode of isolating diode D1, i.e. VB=VC with this.
Thus, because voltage feedback controller 203 is constantly equal to the voltage VB (being VD Vout) of the negative electrode of isolating diode D1 in order to the reference frame (i.e. the voltage VC of second end of first resistance R 1) of regulating main power source MP, so just stably/accurately exporting desired VD Vout, first group of power supply unit 101 give server 105 uses.In addition, when the voltage VB of the negative electrode of isolating diode D1 is too high, also can be compared device CP and isolates, prevent that with this too high VD Vout from pouring in down a chimney in first group of power supply unit 101.
Based on as can be known above-mentioned, present embodiment utilizes pressure reduction to detect unit 205 and is constantly equal to the voltage VB of the negative electrode of isolating diode D1 with the voltage VC of second end of controlling first resistance R 1, uses for server 105 thereby make the group power supply unit 101 of winning stably/accurately export desired VD Vout.In addition, present embodiment also utilizes overvoltage to detect unit 207, when second group of power supply unit 103 overvoltage, the main power source MP that the prior main power source generation unit 201 that promotes first group of power supply unit 101 produces, thereby making the VD Vout that produces of group power supply unit 101 that wins not because load aggravation (when namely second group of power supply unit 103 lost efficacy because of overvoltage) causes excessive voltage drop, and being guaranteed to be not less than the minimum power specification of server 105.
Fig. 4 is the circuit diagram of first group of power supply unit 101 of another embodiment of the present invention.Please merge with reference to Fig. 3 and Fig. 4, Fig. 4 and Fig. 3 difference only are: it is to utilize operational amplifier (operational amplifier) OP, second resistance R 2 that the pressure reduction of Fig. 4 detects unit 205, and diode D3 realizes.Wherein, the positive input terminal (+) of operational amplifier OP connects the negative electrode of isolating diode D1, and the negative input end (-) of operational amplifier OP then connects second end of first resistance R 1.The output of the first end concatenation operation amplifier OP of second resistance R 2.The anode of diode D3 connects second end of first resistance R 1, and the negative electrode of diode D3 then connects second end of second resistance R 2.
In the present embodiment, because output stage (output stage) structure of operational amplifier OP is different from the output stage structure of comparator C P, must set up diode D3 so the pressure reduction of Fig. 4 detects in the unit 205 more, prevent that with this too high VD Vout from pouring in down a chimney in first group of power supply unit 101.In this, because the overall operation of first group of power supply unit 101 of Fig. 4 is similar to first group of power supply unit 101 of Fig. 3 in fact, so also no longer given unnecessary details at this.
In sum, power supply device proposed by the invention utilizes pressure reduction to detect the unit, voltage with second end of controlling first resistance is constantly equal to the voltage of the negative electrode of isolating diode, uses for load (for example high-order such as server, industrial computer electronic product) thereby make the group power supply unit of winning stably/accurately export desired VD.In addition, power supply device proposed by the invention also utilizes overvoltage to detect the unit, with when second group of power supply unit overvoltage, the main power source that the prior main power source generation unit that promotes first group of power supply unit produces, thereby the VD that the group power supply unit of winning is produced does not cause excessive voltage drop because load aggravates (when namely second group of power supply unit lost efficacy because of overvoltage), and is guaranteed to be not less than the minimum power specification of electronic product.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. power supply device comprises:
One first group of power supply unit in order to receiving a direct current input voltage, and produces a direct current output voltage according to this, and this first group of power supply unit comprises:
One main power source generation unit in order to receive and to change this DC input voitage, produces a main power source according to this;
One isolating diode connects this main power source generation unit, and its anode is in order to receive this main power source, and its negative electrode is then in order to export this VD;
One first resistance, its first end connects the anode of this isolating diode;
One voltage feedback controller connects second end and this main power source generation unit of this first resistance, in order to the voltage according to second end of this first resistance, provides a control signal controlling this main power source generation unit, thereby regulates this main power source; And
One pressure reduction detects the unit, connect the negative electrode of this isolating diode and second end of this first resistance, voltage in order to second end of the voltage of the negative electrode of this isolating diode relatively and this first resistance, the voltage of controlling second end of this first resistance according to this is constantly equal to the voltage of the negative electrode of this isolating diode, thereby makes this first group of power supply unit stably export this VD.
2. power supply device according to claim 1 also comprises:
One second group of power supply unit in order to receiving this DC input voitage, and produces this VD according to this,
Wherein, this first group with this second group of power supply unit this VD of producing respectively be supplied to a load to use simultaneously.
3. power supply device according to claim 2, wherein this first group of power supply unit also comprises:
One overvoltage detects the unit, connect the negative electrode of this isolating diode and second end of this first resistance, in order to when this second group of power supply unit overvoltage, drag down the voltage of second end of this first resistance, increase the work period of this control signal according to this, thereby promote this main power source.
4. power supply device according to claim 3, wherein this pressure reduction detects the unit and comprises:
One comparator, its positive input terminal connects the negative electrode of this isolating diode, and its negative input end then connects second end of this first resistance; And
One second resistance, its first end connects the output of this comparator, and its second end then connects second end of this first resistance.
5. power supply device according to claim 3, wherein this pressure reduction detects the unit and comprises:
One operational amplifier, its positive input terminal connects the negative electrode of this isolating diode, and its negative input end then connects second end of this first resistance;
One second resistance, its first end connects the output of this operational amplifier; And
One first diode, its anode connect second end of this first resistance, and its negative electrode then connects second end of this second resistance.
6. power supply device according to claim 3, wherein this overvoltage detects the unit and comprises:
One Zener diode, its negative electrode connects the negative electrode of this isolating diode;
One the 3rd resistance, its first end connects the anode of this Zener diode;
One bipolar transistor, its base stage connect second end of the 3rd resistance, and its emitter-base bandgap grading then is connected to an earthing potential; And
One the 4th resistance, its first end connects second end of this first resistance, and its second end then connects the collector of this bipolar transistor.
7. power supply device according to claim 6, wherein this bipolar transistor is a bipolar npn transistor npn npn.
8. according to claim 1 a described power supply device, wherein this main power source generation unit comprises:
One switch, its first end is in order to receive this DC input voitage, and its control end is then in order to receive this control signal;
One second diode, its anode is connected to an earthing potential, and its negative electrode then connects second end of this switch;
One inductance, its first end connects second end of this switch, and its second end then connects first end of this first resistance to produce this main power source; And
One electric capacity, its first end connects second end of this inductance, and its second end then is connected to this earthing potential.
9. power supply device according to claim 8, wherein this main power source generation unit is the direct current transducer that always circulates.
10. power supply device according to claim 9, wherein this DC-DC transducer comprises booster type and the buck converter of an isolated form or non-isolation type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010004204 CN102130588B (en) | 2010-01-14 | 2010-01-14 | Power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010004204 CN102130588B (en) | 2010-01-14 | 2010-01-14 | Power supply device |
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| Publication Number | Publication Date |
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| CN102130588A CN102130588A (en) | 2011-07-20 |
| CN102130588B true CN102130588B (en) | 2013-09-18 |
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| CN 201010004204 Active CN102130588B (en) | 2010-01-14 | 2010-01-14 | Power supply device |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2935615Y (en) * | 2006-08-03 | 2007-08-15 | 维用国际股份有限公司 | Power supply device with multi-path constant current output |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001298945A (en) * | 2000-04-17 | 2001-10-26 | Taiyo Yuden Co Ltd | Driving method for power circuit, power circuit, and electronic part for power supply |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2935615Y (en) * | 2006-08-03 | 2007-08-15 | 维用国际股份有限公司 | Power supply device with multi-path constant current output |
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| CN102130588A (en) | 2011-07-20 |
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