CN100504707C - Transient voltage compensation device and power supply device using same - Google Patents
Transient voltage compensation device and power supply device using same Download PDFInfo
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- CN100504707C CN100504707C CNB2006101520899A CN200610152089A CN100504707C CN 100504707 C CN100504707 C CN 100504707C CN B2006101520899 A CNB2006101520899 A CN B2006101520899A CN 200610152089 A CN200610152089 A CN 200610152089A CN 100504707 C CN100504707 C CN 100504707C
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Abstract
The present relates to a transient voltage compensation device and a power supplier using the device. The power supplier mainly uses an energy transfer circuit to couple between the input end and the output end of a power converter; when the load changes transiently, the present invention can capture the power coupled by the energy transfer circuit to compensate the output of the power supplier, and thereby the output voltage can be stabilized, as well as improving the transient response of the power supplier.
Description
Technical field
The invention relates to a kind of switched power supplier, and when particularly changeing heavy duty by underloading, in order to compensation transient state output voltage conflict ripple (undershoot) down relevant for a kind of load when power supply unit; Or when the load of power supply unit is changeed heavy duty by underloading in order to the device and the power supply unit that uses this device of compensation transient state output voltage upper punch surging (overshoot).
Background technology
Along with the fast development of various information and communication apparatus, the design of high-level efficiency switched power supply has become the knowledge in conjunction with engineering and experience.Switched power supply is used for power transfer in many application, comprise computer, illumination transverter and telecommunication apparatus.Switched power supply with general DC-DC, the switching moment that load is changeed heavy duty by underloading is because the energy of the switched power supply of DC-DC can't in time be supplied, can cause output voltage moment decline, and produce conflict ripple (undershoot) down.Yet in many application, it is defeated that stable voltage goes out, and the problem that voltage instantaneous descends is be suppressed in the permissible range.
US business Ying Daier (Intel) company on the employed power supply of central processing unit, formulated the central processing unit standard (Voltage Regulator Down, VRD).Stipulated that in this standard the output voltage of power supply unit needs to change according to the demand of central processing unit.
Yet, modern central processing unit when heavy-duty service, moving on the power consumption of hectowatt.And central processing unit is when underrun, general about five watts.The core voltage of modern general central processing unit greatly about 1V between the 2V, suppose the core voltage 1V of a central processing unit, when central processing unit supposes that when heavy-duty service the consumption wattage is 100Watt, this moment, power supply unit must be supplied the electric current of 100A, if central processing unit is when underrun, power supply unit only need be supplied for example electric current of 5A.
If when central processing unit changed heavy-duty service into by underrun, the load of power supply unit also changed heavy duty into by underloading, this moment, the voltage of power supply unit can descend moment.Too much when the output voltage moment decline that power supply unit is exported, just can cause central processing unit to enter protection and make computer work as machine because of core voltage descends, what is more, may cause the damage of central processing unit in addition.In addition, concerning a computer user,, be to be accepted by the user if computer is worked as machine when work.If when central processing unit changed underrun into by heavy-duty service, the load of power supply unit also changed underloading into by heavy duty, this moment, the voltage of power supply unit can rise moment.The phenomenon that this kind voltage instantaneous rises improves the excessive power drain that is caused because of core voltage except meeting causes central processing unit, even may cause the damage of central processing unit in addition.
Summary of the invention
Purpose of the present invention is exactly that a kind of transient voltage compensation device and the power supply unit that uses this device are being provided, when the output load of this power supply changeover device is changeed heavy duty by underloading, provide extra compensation energy to load, it is stable that its output voltage is kept, and improves power supply unit transient response.
A further object of the present invention is providing a kind of transient voltage compensation device exactly, and in order to control a power supply changeover device, when this power supply changeover device output load was changeed underloading by heavy duty, it is stable that its output voltage is kept, and improves power supply unit transient response.
Another purpose of the present invention provides a kind of power supply unit that uses transient voltage compensation device, in order to when output load is changeed underloading by heavy duty, reduce output voltage moment rising or decline, further make and improve power supply unit transient response by output voltage stabilization.
A kind of transient voltage compensation device of the present invention connects power supply changeover device, and this power supply changeover device has a power output end, and this transient voltage compensation device comprises first operational amplifier, direct current barrier element, second operational amplifier and energy carry circuit.First operational amplifier couples power output end, and this first operational amplifier has a compensation output terminal; The direct current barrier element has first end and second end, and first end couples the compensation output terminal; Second operational amplifier couples second end, and the reference signal end, and second operational amplifier has the energy control end; Energy carry circuit couples energy control end, this energy carry circuit have power supply provides end and compensation end, and wherein the compensation end couples power output end.
According to the described transient voltage compensation device of preferred embodiment of the present invention, above-mentioned energy carry circuit comprises impedor and on-off element.An impedor end provides end for the power supply of energy carry circuit.The switch control end of on-off element is the control end of energy carry circuit, and switch first end of on-off element couples the impedor other end, and switch second end of on-off element is the compensation end of energy carry circuit.
The present invention proposes a kind of power supply unit, and this power supply unit comprises power supply changeover device, first operational amplifier, switches comparator circuit, direct current barrier element, second operational amplifier and energy carry circuit.Power supply changeover device comprises input end and output terminal.First operational amplifier couples power output end, and first operational amplifier has a compensation output terminal.The direct current barrier element has first end and second end, and first end couples the compensation output terminal.Switch comparator circuit and couple the compensation output terminal and receive the sawtooth signal,, produce pulse width modulation signal with the control power supply changeover device according to the signal of compensation output terminal and the difference of sawtooth signal.Second operational amplifier couples second end, and the reference signal end, and second operational amplifier has an energy control end.Energy carry circuit couples energy control end, energy carry circuit have power supply provides end and compensation end, and wherein the compensation end couples power output end.
According to the described power supply unit of preferred embodiment of the present invention, above-mentioned energy carry circuit comprises impedor and on-off element.An impedor end provides end for the power supply of energy carry circuit.The switch control end of on-off element is the control end of energy carry circuit, and switch first end of on-off element couples the impedor other end, and switch second end of on-off element is the compensation end of energy carry circuit.
An aspect of of the present present invention is coupled between the input end and output terminal of power supply changeover device because of adopting the energy carry circuit.When the seen load of power supply unit was changeed heavy duty by underloading, the alternating component of the voltage that acquisition is exported by power output end was controlled the circuit turn-on between these energy carry circuit two ends, thus output voltage can be when underloading be changeed heavy duty moment descend.Another aspect of the present invention adopts the energy carry circuit to be coupled between power output end and the ground connection.When the seen load of power supply unit is changeed underloading by heavy duty, capture the alternating component of the signal of exporting by power output end, control this energy carry circuit conducting.The excess energy of utilizing the circuitry consumes power supply unit between the energy carry circuit two ends to produce afterwards makes and improves power supply unit transient response by output voltage stabilization.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
Description of drawings
Fig. 1 is the power supply unit circuit diagram that the embodiment of the invention is used transient voltage compensation device.
Fig. 2 is the circuit diagram of the transient voltage compensation device implemented with Fig. 1 embodiment.
Fig. 3 is the operation waveform diagram of the circuit of Fig. 2 embodiment of the present invention.
Fig. 4 is the operation waveform diagram of the circuit of Fig. 2 embodiment of the present invention.
Fig. 5 is the power supply unit circuit diagram of the use transient voltage compensation device of the embodiment of the invention.
Fig. 6 is the operation waveform diagram of the circuit of Fig. 5 embodiment of the present invention.
Fig. 7 is the power supply unit circuit diagram of the use transient voltage compensation device of the embodiment of the invention.
Fig. 8 is the operation waveform diagram of the circuit of Fig. 5 of the present invention and Fig. 7 embodiment.
10,20,50: 11: the first operational amplifiers of the circuit of transient voltage compensation device
21,51: power supply changeover device and control circuit 210,510 thereof: power supply changeover device
202,211,502,511: operational amplifier 212,512: switch comparator circuit
12,201,501: direct current barrier element, electric capacity 203,503: energy carry circuit
V10: power output end A11: compensation output terminal
R12: reference signal end EC12: energy control end
VP14: power supply provides end CS14: the compensation end
Z1: the first impedance circuit Z2: second impedance circuit
M203:MOS electric crystal L203: inductance
D203: diode V
o': the output reference signal
V
Ref: the first reference signal V
Comp: compensating signature
V
Saw: sawtooth signal D: pulse width modulation signal
I
o: output current V
In: input voltage
V
o: output voltage V
Comp, ac: the AC compensation signal
V
Comp, ref, V
Comp, ref2: the second reference signal V
c: energy carry circuit control signal
Q503:BJT electric crystal R203, R503: resistance
Embodiment
Because in the previous power supply unit technology, having output voltage moment of causing power supply unit when heavily loaded underloading transition descends, except causing user not convenient, the easier damage that causes load, so the present invention proposes device and the power supply unit that uses this device in order to compensation transient state under-voltage.Below just cooperate and illustrate the present invention with embodiment.
Fig. 1 is the power supply unit circuit diagram that the embodiment of the invention is used transient voltage compensation device.Please refer to Fig. 1, this power supply unit comprises power supply changeover device 10, first operational amplifier 11, direct current barrier element 12, second operational amplifier 13 and energy carry circuit 14.First operational amplifier 11 couples the power output end V10 of power supply changeover device 10, and this first operational amplifier 11 has a compensation output terminals A 11.Direct current barrier element 12 has first end and second end, and first end couples compensation output terminals A 11.Second operational amplifier 13 couples second end and the reference signal end R12 of direct current barrier element 12, and second operational amplifier has energy control end EC12.Energy carry circuit 14 couples energy control end EC12, this energy carry circuit 14 has power supply provides end VP14 and compensation end CS14, and wherein, compensation end CS14 couples the power output end V10 of power supply changeover device 10.
What deserves to be mentioned is, though in the foregoing description to transient voltage compensation device and use its power supply unit circuit to depict a possible kenel, usually know that the knowledgeable should know but have in the affiliated technical field, each manufacturer for energy carry circuit 14 couple with and the design of circuit all different, therefore application of the present invention is when being not restricted to the possible kenel of this kind.In other words, so long as energy carry circuit 14 is coupled between power supply changeover device 10 output terminals and the offset supply, and when the load instantaneous variation, acquisition has been to have met spiritual place of the present invention just by the output with the offset supply supply of power supply that power conversion circuits coupled.
Next will enumerate several embodiment so that present technique field person can implement the present invention easily.
Fig. 2 is the circuit diagram of the transient voltage compensation device implemented with Fig. 1 embodiment.Please refer to Fig. 2, wherein to cross the circuit that comes be the transient voltage compensation device circuit of the embodiment of the invention to dotted line 20, and dotted line 21 crosses the circuit that comes and is known power supply changeover device and control circuit thereof.The circuit of this embodiment comprises power supply changeover device 210, the first impedance circuit Z1, the second impedance circuit Z2, operational amplifier 211, switches comparator circuit 212, direct current barrier element 201, operational amplifier 202 and energy carry circuit 203.At this embodiment, energy carry circuit 203 comprises electric crystal M203, the resistance R 203 as on-off element, and direct current barrier element 201 is implemented with electric capacity in addition, also supposes input voltage vin specific output voltage Vo height at this.
In above-mentioned Fig. 2 circuit, power supply changeover device and control circuit 21 thereof comprise power supply changeover device 210, operational amplifier 211 and switch comparator circuit 212.Operational amplifier 211 receives the output voltage V o (power output end) and the first reference signal V of power supply changeover device
RefNext, according to the output voltage V o and the first reference signal V
RefDifference, output compensating signature V
Comp(compensation output terminal).Switch comparator circuit 212 and receive compensating signature V
CompAnd sawtooth signal V
Saw, according to compensating signature V
CompAnd sawtooth signal V
SawDifference, produce pulse width modulation signal D with control power supply changeover device 210 (power input).Yet the operation of these assemblies is to belong to know that usually the knowledgeable should know in the art, therefore need not more detailed argumentation.As a same reason, power supply changeover device can be for example variously opened up the servant (forward flyback...) is implemented, and need not more detailed argumentation at this with what voltage-dropping type (buck), buck-boost type (buck-boost) or its were derived.
Fig. 3 is the operation waveform diagram of the circuit of Fig. 2 embodiment of the present invention.Please also refer to Fig. 2 and Fig. 3, when underloading is changeed heavy duty, output current I
oMoment rises, and causes output voltage V
oMoment descends.The operational amplifier 211 of the shared known power supply unit of transient voltage compensation device of the embodiment of the invention (first operational amplifier), this operational amplifier 211 is according to output reference signal V
o' with the first reference signal V
RefOutput compensating signature V
CompUse control power supply changeover device 210, next compensating signature V
CompVia its direct current composition of electric capacity 201 (direct current barrier element) filtering, with AC compensation signal V
Comp, acExport operational amplifier 202 (second operational amplifier) to.
Next, operational amplifier 202 is with AC compensation signal V
Comp, acAnd the second reference signal V
Comp, refThe back output energy carry circuit of making comparisons control signal V
c(energy control end).The gate of electric crystal M203 (switch control end) receives energy carry circuit control signal V
cBack conducting electric crystal M203, the output terminal that the energy of importing is imported power supply changeover device 210 is with the compensation output voltage V
oAnd resistance R 203 is in this embodiment in order to do the action of current limliting, in order to avoid overcompensate makes output voltage too high.Utilize the output voltage V after above-mentioned action is compensated
O2, in the time of so just can compensating because of underloading commentaries on classics heavy duty, output voltage moment decline, and the transient response that improves power supply unit.
Usually know that the knowledgeable should know, operational amplifier 202 in the foregoing description and switching comparator circuit 212 can be implemented it with comparer or with operational amplifier.In addition, on-off element except the N type MOS electric crystal M203 of present embodiment, still available P type MOS electric crystal, P or N type JFET electric crystal and P or N type BJT electric crystal or the like.If use N type electric crystal as on-off element, need high side drive (high side drive) the driving N type electric crystal of use, this high side drive technology is known techniques, need not more detailed argumentation at this.In addition, the linear zone resistance of the also available JFET electric crystal of resistance R 203, MOSFET electric crystal and BJT electric crystal replaces, and therefore the invention is not restricted to this.
Fig. 4 is another operation waveform diagram of the embodiment of the invention.This waveform mainly is with the second reference signal V originally
Comp, refChange the second reference signal V of form of communication into
Comp, ref2, so more can do sth. in advance turn-on switch component (M203), the effect of the output under-voltage when effectively reducing underloading commentaries on classics heavy duty.
Fig. 5 is the power supply unit circuit diagram of the use transient voltage compensation device of the embodiment of the invention, wherein to cross the circuit that comes be the transient voltage compensation device circuit of the embodiment of the invention to dotted line 50, and dotted line 51 crosses the circuit that comes and is known power supply changeover device and control circuit thereof.Please refer to Fig. 5, the circuit of this embodiment comprises power supply changeover device 510, the first impedance circuit Z1, the second impedance circuit Z2, operational amplifier 511, switches comparator circuit 512, direct current barrier element 501, operational amplifier 502 and energy carry circuit 503.At this embodiment, energy carry circuit 503 comprises electric crystal M503, inductance L 503 and the diode D503 as on-off element, and direct current barrier element 501 usefulness electric capacity are implemented in addition.
In above-mentioned Fig. 5 circuit, power supply changeover device and control circuit 51 thereof comprise power supply changeover device 510, operational amplifier 511 and switch comparator circuit 512.Operational amplifier 511 receives the output voltage V o (power output end) and the first reference signal V that power supply changeover device is exported
RefNext, according to the output voltage V o and the first reference signal V
RefDifference, output compensating signature V
Comp(compensation output terminal) switches comparator circuit 512 and receives compensating signature V
CompAnd sawtooth signal V
Saw, according to compensating signature V
CompAnd sawtooth signal V
SawDifference, produce pulse width modulation signal D with control power supply changeover device 510 (power input).Yet the operation of these assemblies is to belong to know that usually the knowledgeable should know in the art, therefore need not more detailed argumentation.As a same reason, power supply changeover device can be for example with voltage-dropping type (buck), booster type (boost), buck-boost type (buck-boost) or its derive various open up to fall forward implement, need not more detailed argumentation at this.
Fig. 6 is the operation waveform diagram of the circuit of Fig. 5 embodiment of the present invention.Please also refer to Fig. 5 and Fig. 6, when underloading is changeed in heavy duty, output current I
oMoment descends, and causes output voltage V
oMoment rises.The operational amplifier 511 of the shared known power supply unit of transient voltage compensation device of the embodiment of the invention (first operational amplifier), this operational amplifier 511 is according to output voltage V
oWith the first reference signal V
RefOutput compensating signature V
CompUse control power supply changeover device 510, next compensating signature V
CompVia its direct current composition of electric capacity 501 (direct current barrier element) filtering, with AC compensation signal V
Comp, acExport operational amplifier 502 (second operational amplifier) to.Operational amplifier 502 is with AC compensation signal V
Comp, acAnd the second reference signal V
Comp, refThe back output energy carry circuit of making comparisons control signal V
c(energy control end).The gate of electric crystal M503 (switch control end) receives energy carry circuit control signal V
cBack conducting electric crystal M503.Next, unnecessary energy is consumed the output voltage V after being compensated by inductance L 503 with diode D503
O2, in the time of so just can compensating because of heavy duty commentaries on classics underloading, output voltage moment rising.
Usually know that the knowledgeable should know, operational amplifier 502 in the foregoing description and switching comparator circuit 512 can be implemented it with comparer or with operational amplifier, so the invention is not restricted to this.
Fig. 7 is the power supply unit circuit diagram of the use transient voltage compensation device of the embodiment of the invention.Be in energy carry circuit 503 different with Fig. 1 embodiment of this embodiment changes into BJT electric crystal Q503 and resistance R 503 enforcements.This embodiment class of operation is like Fig. 1.As a same reason, unnecessary energy is consumed the output voltage V after being compensated by resistance R 503
O2Yet,, know that usually the knowledgeable should know, on-off element can be used JFET electric crystal, MOSFET electric crystal, and in addition, the linear zone resistance of the also available JFET electric crystal of resistance R 503, MOSFET electric crystal and BJT electric crystal replaces, and therefore the invention is not restricted to this.
Fig. 8 is another operation waveform diagram of the embodiment of the invention.This waveform mainly is with the second reference signal V originally
Comp, refChange the second reference signal V of form of communication into
Comp, ref2, so more can do sth. in advance turn-on switch component (M503, Q503), the effect of the output over-voltage when effectively reducing heavy duty commentaries on classics underloading.
In sum, the present invention is coupled between the input end and output terminal of power supply changeover device because of adopting the energy carry circuit.When the seen load of power supply unit is changeed heavy duty by underloading, the alternating component of the voltage that acquisition is exported by power output end, control the circuit turn-on between these energy carry circuit two ends, therefore output voltage can be when underloading not be changeed heavy duty moment descend, make and improve power supply unit transient response by output voltage stabilization.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the claim person of defining.
Claims (13)
1. a transient voltage compensation device connects a power supply changeover device, and this power supply changeover device has a power output end, it is characterized in that this transient voltage compensation device comprises:
One first operational amplifier couples this power output end, and this first operational amplifier has a compensation output terminal;
Flow resistance has one first end and one second end every element always, and this first end couples this compensation output terminal;
One second operational amplifier couples this second end and a reference signal end, and this second operational amplifier has an energy control end; And
One energy carry circuit couples this energy control end, and this energy carry circuit has a power supply provides an end and a compensation end, and wherein this compensation end couples this power output end.
2. transient voltage compensation device as claimed in claim 1, it is characterized in that wherein this energy carry circuit receives the control signal that this energy control end is exported, and this power supply provides end to couple the input end of this power supply changeover device, this compensation end couples this power output end, and according to this control signal determine this power supply of conducting whether that end is provided and should compensation hold between circuit.
3. transient voltage compensation device as claimed in claim 2 is characterized in that wherein this energy carry circuit comprises:
One on-off element comprises a switch control end, a switch first end and a switch second end, and wherein this switch control end connects this energy control end, and this switch second end is this compensation end.
4. transient voltage compensation device as claimed in claim 3 is characterized in that wherein this energy carry circuit comprises:
One impedor, being coupled to this power supply provides between end and this switch first end.
5. transient voltage compensation device as claimed in claim 4 is characterized in that wherein this impedor is a resistance.
6. transient voltage compensation device as claimed in claim 1 is characterized in that more comprising:
One switches comparator circuit, couples this compensation output terminal and receives a sawtooth signal, according to the signal of this compensation output terminal and the difference of this sawtooth signal, produces a pulse width modulation signal to control this power supply changeover device.
7. transient voltage compensation device as claimed in claim 1 is characterized in that wherein this direct current barrier element is a capacitor.
8. transient voltage compensation device as claimed in claim 1 is characterized in that wherein the negative input end of this first operational amplifier couples this power output end, and its positive input terminal receives a reference signal, and its output terminal is this compensation output terminal.
9. transient voltage compensation device as claimed in claim 8 is characterized in that more comprising:
One first impedance circuit, the one end couples this power output end, and its other end couples the negative input end of this first operational amplifier; And
One second impedance circuit, the one end couples the negative input end of this first operational amplifier, and its other end couples the output terminal of this first operational amplifier.
10. transient voltage compensation device as claimed in claim 1, it is characterized in that wherein this energy carry circuit receives a control signal, and this power supply provides end ground connection, this compensation end couples this power output end, and determines this power supply that the conducting state of the circuit between end and this compensation end is provided according to this control signal.
11. transient voltage compensation device as claimed in claim 10 is characterized in that wherein this energy carry circuit comprises:
One on-off element comprises a switch control end, a switch first end and a switch second end, and wherein this switch control end connects this energy control end, and this switch second end is this compensation end.
12. transient voltage compensation device as claimed in claim 11 is characterized in that wherein this energy carry circuit comprises:
One inductance is in parallel with a diode, is coupled between this switch second end and this power output end, and wherein this diode cathode couples this power output end, and its anode couples this switch second end.
13. a power supply unit is characterized in that comprising:
One power supply changeover device comprises a power input and a power output end;
One first operational amplifier couples this power output end, and this first operational amplifier has a compensation output terminal;
Flow resistance has one first end and one second end every element always, and this first end couples this compensation output terminal;
One switches comparator circuit, couples this compensation output terminal and receives a sawtooth signal, according to the signal of this compensation output terminal and the difference of this sawtooth signal, produces a pulse width modulation signal to control this power supply changeover device;
One second operational amplifier couples this second end and a reference signal end, and this second operational amplifier has an energy control end; And
One energy carry circuit couples this energy control end, and this energy carry circuit has a power supply provides an end and a compensation end, and wherein this compensation end couples this power output end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101520899A CN100504707C (en) | 2006-09-11 | 2006-09-11 | Transient voltage compensation device and power supply device using same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101520899A CN100504707C (en) | 2006-09-11 | 2006-09-11 | Transient voltage compensation device and power supply device using same |
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| CN101145063A CN101145063A (en) | 2008-03-19 |
| CN100504707C true CN100504707C (en) | 2009-06-24 |
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| CN102148567B (en) * | 2010-02-10 | 2015-07-08 | 上海华虹宏力半导体制造有限公司 | Voltage generating circuit |
| JP7129847B2 (en) * | 2018-08-10 | 2022-09-02 | エイブリック株式会社 | power supply circuit |
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