CN105278601B - Current source for manostat and its manostat - Google Patents
Current source for manostat and its manostat Download PDFInfo
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- CN105278601B CN105278601B CN201410347409.0A CN201410347409A CN105278601B CN 105278601 B CN105278601 B CN 105278601B CN 201410347409 A CN201410347409 A CN 201410347409A CN 105278601 B CN105278601 B CN 105278601B
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Abstract
The invention discloses a kind of current source and manostat, described current source is used for quick adjustment one output current, and it includes certain current generating module, is coupled to a control node, flow through described control node for producing a rated current, to determine a voltage of described control node；One electric capacity, is coupled to an outfan of described current source；One curent change detecting module, is coupled between described control node and described electric capacity, for when the described outfan of described current source receives instantaneous electric current change, producing a change by the described voltage that described electric capacity makes described control node；And a transconcluctance amplifier, it is coupled between described control node and described outfan, for when the described voltage of described control node produces described change, accordingly changing the size of the described output current of described outfan.
Description
Technical field
The present invention relates to a kind of current source for manostat and its manostat, more particularly, to one kind can quickly adjust voltage stabilizing
The current source of the output current of device and its manostat.
Background technology
Manostat (voltage regulator) typically locks the output electricity that it to be produced using feedback circuit
Pressure, and the outfan in manostat arranges the voltage stabilizing ability that electric capacity of voltage regulation carrys out auxiliary stabilizer.Wherein, the setting of electric capacity of voltage regulation,
When the demand current of the load mainly being driven in manostat produces rapid change, the electric charge that it is prestored is converted into driving
Electric current is provided to load, to maintain the degree of stability of the output voltage of the outfan of manostat.In other words, if manostat energy to be made
Enough bear the change of wilderness demand electric current it is necessary to use large-sized electric capacity of voltage regulation, thus increased the cost of manostat, and drop
The low reaction rate of manostat.
Therefore, industry gradually develops the various manostat not requiring the use of electric capacity of voltage regulation, and these manostat often have
Complicated circuit for detecting, for detecting the dynamic change of load end output voltage, and the change according to the output voltage being detected
Change the driving current dynamically to adjust manostat.A kind of common mode is using N-type metal-oxide half field effect transistor (N-type
Metal oxide semiconductor field-effect transistor, NMOS) replace p-type MOSFET crystal
Pipe (P-type metal oxide semiconductor field-effect transistor, PMOS) conduct supplies electric crystal
Pipe.However, the output voltage adjusting range of N-type metal-oxide half field effect transistor is less, and on the demand current of load end is rapid
When rising, the grid-source voltage (Vgs) of N-type metal-oxide half field effect transistor can be significantly increased, and causes source voltage rapid decrease,
It is unable to reach stable output voltage.Therefore, U.S. Patent Publication No. US 2009/0212753A1 and United States Patent (USP) certificate number US
7,105,033 teach another kind of circuit structure respectively, and its key concept is all to compare output voltage and ginseng using comparator
Examine voltage, when output voltage is affected by load extraction immediate current and drops to certain level, to open electricity in a flash
Stream source is supplying the current needs of moment, and compares output voltage and another reference voltage using another comparator, with output
Electric current is excessive to be caused to close this immediate current source when output voltage is too high.However, the manostat of this type generally require more complicated
Circuit design, thus improve circuit cost and extra electrical source consumption, and immediate current source must produce in output voltage
More apparent decline is just opened later, and the effect of its regulated output voltage is limited.Further, since the circuit of this type has two groups of ratios
Compared with device, and it is controlled using two groups of control loops, be easier to stability problem.
With the progress of technique, the density of digital circuit is more and more high, and feature is more and more strong, produced immediate current
Also more and more big.Therefore, the response speed of the existing manostat not including electric capacity of voltage regulation is limited, has not been inconsistent demand.Even bag
Include the manostat of electric capacity of voltage regulation, in the case that load end demand current is more and more big, its voltage regulation result is more susceptible to chip
The impact of the spurious impedance of outside or inside circuit and reduce.In consideration of it, prior art has improved necessity in fact.
Content of the invention
Therefore, the main object of the present invention is to provide a kind of current source and manostat that can quickly adjust output current
(voltage regulator), when load end needs a large amount of immediate current, quickly to adjust the size of output current, and then
Reach the effect of regulated output voltage, avoid output voltage to be supported electric current and drag down simultaneously and cause circuit malfunction.
The present invention discloses a kind of current source, and for quick adjustment one first output current, described current source includes certain electricity
Stream generation module, is coupled to a control node, flows through described control node for producing a rated current, to determine described control
One voltage of node；One electric capacity, is coupled to an outfan of described current source；One curent change detecting module, is coupled to described
Between control node and described electric capacity, for when the described outfan of described current source receives instantaneous electric current change, leading to
Crossing described electric capacity makes the described voltage of described control node produce a change；And a transconcluctance amplifier, it is coupled to described control
Between node and described outfan, for when the described voltage of described control node produces described change, accordingly changing
The size of described first output current of described outfan.
Invention additionally discloses a kind of manostat, including a buffer, a current source and a voltage stabilizing amplifier.Described buffer
It is coupled between an outfan of described manostat and a fast reaction control end, for producing an output current.Described electric current
Source is coupled to described buffer, and described current source includes certain current generating module, is coupled to a control node, for producing one
Rated current flows through described control node, to determine a voltage of described control node；One electric capacity, is coupled to described manostat
Described outfan；One curent change detecting module, is coupled between described control node and described electric capacity, in described voltage stabilizing
When the described outfan of device receives instantaneous electric current change, produced by the described voltage that described electric capacity makes described control node
One change；And a transconcluctance amplifier, it is coupled between described control node and described fast reaction control end, for described
When the described voltage of control node produces described change, produce a corresponding output signal in described fast reaction control end,
To control described buffer to change the size of described output current.Described voltage stabilizing amplifier is coupled to the described defeated of described manostat
Go out between end and described fast reaction control end, for locking a steady state voltage of described outfan, and determine described quickly anti-
Answer a bias of control end.
Brief description
Fig. 1 is the schematic diagram of the embodiment of the present invention one current source.
Fig. 2 is a kind of schematic diagram of embodiment of current source.
Fig. 3 is the schematic diagram of the another embodiment of current source.
Fig. 4 is the schematic diagram of the another embodiment of current source.
Fig. 5 is the schematic diagram of the embodiment of the present invention one manostat.
Fig. 6 is a kind of schematic diagram of embodiment of manostat of Fig. 5.
Fig. 7 is the schematic diagram of another manostat of the embodiment of the present invention.
Fig. 8 is a kind of schematic diagram of embodiment of manostat of Fig. 7.
Fig. 9 is the schematic diagram of another manostat of the embodiment of the present invention.
Figure 10 is a kind of schematic diagram of embodiment of manostat of Fig. 9.
Wherein, description of reference numerals is as follows：
10 current sources
102 determine current generating module
104 curent change detecting modules
106 transconcluctance amplifiers
C1, CMP1, CMN1, CMP2, CMN2 electric capacity
R1, RDCP, RDCN resistance
N_CTRL, N_CTRL1, N_CTRL2 control node
N_OUT outfan
IOUT output current
MP1, MP2, MP3, MP3 ', MP4, p-type metal-oxide half field effect transistor
MP5
MN1, MN2, MN3, MN3 ', MN4, N-type metal-oxide half field effect transistor
MN5、MN0
NDP1, NDN1, NDP4, NDN4 node
50th, 70,90 manostat
500th, 700,900 voltage stabilizing amplifier
502nd, 702,902 amplifier
504th, 506,704,706,904,906 divider resistance
Vref reference voltage
VOUT output voltage
708th, 908 buffer
710 transfer resistances
N_FAST fast reaction control end
V_FAST control voltage
Specific embodiment
Refer to Fig. 1, Fig. 1 is the schematic diagram of the embodiment of the present invention one current source 10.As shown in figure 1, current source 10 includes
Certain current generating module 102, an electric capacity C1, a curent change detecting module 104 and a transconcluctance amplifier 106.Determine electric current to produce
Raw module 102 is coupled to control node N_CTRL, flows through control node N_CTRL for producing a rated current, to determine to control
The voltage of node N_CTRL processed.The main purpose of rated current is used to adjust the bias of control node N_CTRL, is avoiding
In the case of many power consumptions, rated current may be set to less electric current.Electric capacity C1 is coupled to an outfan N_OUT of current source 10
And curent change detecting module 104 between.Curent change detecting module 104 be then coupled to control node N_CTRL and electric capacity C1 it
Between, it can make control node N_ when the outfan N_OUT of current source 10 receives instantaneous electric current change by electric capacity C1
The voltage of CTRL produces corresponding change.Transconcluctance amplifier 106 be coupled to control node N_CTRL and outfan N_OUT it
Between, when the voltage of control node N_CTRL changes, transconcluctance amplifier 106 can be according to the voltage of control node N_CTRL
Change, accordingly changes the size of output current IO UT of outfan N_OUT.In one embodiment, current source 10 also includes
One resistance R1, resistance R1 are coupled to control node N_CTRL and determine between current generating module 102, may be used to avoid determining electric current product
Raw module 102 produces the change in voltage that another immediate current offsets control node N_CTRL.
Specifically, current source 10 can be used to provide the electric current needed for chip system, therefore in system any need power
Circuit all can be considered the load of current source 10.When changing load current moment, electric capacity C1 meeting immediate response, make control
The voltage of node N_CTRL produces change.Then, transconcluctance amplifier 106 can be defeated according to the voltage swing of control node N_CTRL
Go out corresponding output current IO UT.For example, when load transients need a large amount of electric current, can any from Circuits System deposit
Extract electric current in the parasitic capacitance of electric charge, therefore also can extract electric current from electric capacity C1, cause to be coupled to the control node of electric capacity C1
The voltage of N_CTRL declines.When the voltage that transconcluctance amplifier 106 detects control node N_CTRL declines, output electricity can be lifted
The size of stream IOUT is so that output current IO UT meets the load current demand of moment, and then avoids output voltage to be supported electricity
Stream drags down and causes circuit malfunction.On the other hand, when the demand current instantaneous reduction of load end, due to output current IO UT relatively
Greatly, superfluous electric current can be risen by the voltage that electric capacity C1 causes control node N_CTRL.When transconcluctance amplifier 106 detects control
When the voltage of node N_CTRL processed rises, the size of output current IO UT, or even the output current that surplus can be extracted can be reduced
IOUT, causes circuit malfunction to avoid output voltage excessively to rise or produces harmful effect.
It should be noted that in existing current source or voltage regulator circuit, DC loop and ac circuit are typically construction
In same feedback circuit, if be intended to the response speed in motor current source and improve loop bandwidth, often sacrifice circuit is steady
Qualitative.On the other hand, under the consideration of stability, its response speed will necessarily be therefore limited.In comparison, according to Fig. 1's
Circuit structure, determine current generating module 102 and resistance R1 can construction DC loop, electric capacity C1, curent change detecting module 104 and
Transconcluctance amplifier 106 can construction ac circuit (small-signal loop).In the case, DC loop and ac circuit are to separate
's.Therefore, if being intended to the response speed in motor current source it is only necessary to the bandwidth of lifting ac circuit is without adjustment DC loop,
DC loop is made to can reach higher stability.
Refer to Fig. 2, Fig. 2 is a kind of schematic diagram of embodiment of current source 10.As shown in Fig. 2 the electricity of current source 10
Line structure may include p-type metal-oxide half field effect transistor (P-type metal oxide semiconductor field-effect
Transistor, PMOS) MP1, MP2 and MP3, N-type metal-oxide half field effect transistor (N-type metal oxide
Semiconductor field-effect transistor, NMOS) MN1, MN2 and MN3, electric capacity CMP1 and CMN1 and resistance
RDCP.In the circuit structure of Fig. 2, p-type metal-oxide half field effect transistor MP1 and MP3 is with current mirror (current mirror) shape
Formula configures, and N-type metal-oxide half field effect transistor MN1 and MN3 is then respectively intended to sink to (sink) p-type metal-oxide half field effect transistor
The electric current of MP1 and MP3.P-type metal-oxide half field effect transistor MP2 and N-type metal-oxide half field effect transistor MN2 is coupled to transistor MP1
And between MN1, control node N_CTRL1 is then located between transistor MP2 and MN2, to control control by transistor MP2 and MN2
The voltage swing of node N_CTRL1 processed.Electric capacity CMP1 is coupled between outfan N_OUT and node NDP1, wherein, outfan N_
OUT is located between transistor MP3 and MN3, and node NDP1 is located between transistor MP1 and MP2.Electric capacity CMN1 is coupled to outfan
Between N_OUT and node NDN1, wherein, node NDN1 is located between transistor MN1 and MN2.Electric capacity CMP1 and CMN1 is visual
A part of electric capacity C1 for Fig. 1.Resistance RDCP is coupled between grid and control node N_CTRL1 of transistor MP1, and it can
It is considered as a part of the resistance R1 of Fig. 1.
The current mirror being formed according to transistor MP1 and MP3, under stable state, output current IO UT (passes through transistor
The electric current of MP3) size can be substantially equal to the size of the rated current by transistor MP1 and control node N_CTRL1.When negative
When carrying the moment a large amount of electric current of extraction, the charge extraction that load can store from electric capacity CMP1 and CMN1 via outfan N_OUT, make
Become the voltage rapid decrease of node NDP1 and NDN1, the voltage decline of node NDP1 can cause transistor MP2 to close rapidly, and saves
The voltage decline of point NDN1 can cause to be significantly increased by the electric current of transistor MN2, and this electric current can cause control node N_CTRL1
Voltage quick and significantly decline, make transistor MP3 export a large amount of electric currents.By above-mentioned running, transistor MP3 can moment
There is provided load required a large amount of electric currents.It should be noted that existing between the grid of transistor MP1 and control node N_CTRL1
Resistance RDCP, it is intended that when the voltage rapid decrease of control node N_CTRL1, resistance RDCP can avoid transistor MP1
Grid voltage rapid decrease therewith, and cause transistor MP1 to make control node N_CTRL1 quickly through a large amount of electric currents
Voltage quickly gos up (change in voltage offsetting control node N_CTRL1).In other words, resistance RDCP can reduce transistor
The response speed of MP1 is so that the voltage of control node N_CTRL1 exports enough electric currents to meet load need in outfan N_OUT
Go up again after asking.
In addition to meeting rapidly load end demand current, the current source of the present invention also can be when output current be excessive, soon
The path sinking to excess current is provided fastly.Refer to Fig. 3, Fig. 3 is the schematic diagram of the another embodiment of current source 10.As
Shown in Fig. 3, the circuit structure of current source 10 may include p-type metal-oxide half field effect transistor MP3 ', MP4 and MP5, N-type MOS field
Effect transistor MN3 ', MN4 and MN5, electric capacity CMP2 and CMN2 and resistance RDCN.In the circuit structure of Fig. 3, N-type MOS field
Effect transistor MN3 ' and MN4 is configured with current mirror form, and p-type metal-oxide half field effect transistor MP3 ' and MP4 is then respectively as N-type
The current source (source) of metal-oxide half field effect transistor MN3 ' and MN4.P-type metal-oxide half field effect transistor MP5 and N-type gold oxygen half
Field-effect transistor MN5 is coupled between transistor MP4 and MN4, control node N_CTRL2 then be located at transistor MP5 and MN5 it
Between, to control the voltage swing of control node N_CTRL2 by transistor MP5 and MN5.Electric capacity CMP2 is coupled to outfan N_
Between OUT and node NDP4, wherein, outfan N_OUT is located between transistor MP3 ' and MN3 ', and node NDP4 is located at transistor
Between MP4 and MP5.Electric capacity CMN2 is coupled between outfan N_OUT and node NDN4, and wherein, node NDN4 is located at transistor
Between MN4 and MN5.Electric capacity CMP2 and CMN2 can be considered a part of the electric capacity C1 of Fig. 1.Resistance RDCN is coupled to transistor
Between the grid of MN4 and control node N_CTRL2, it can be considered a part of the resistance R1 of Fig. 1.
The current mirror being formed according to transistor MN3 ' and MN4, under stable state, output current IO UT (passes through crystal
The electric current of pipe MN3 ') size can be substantially equal to the size of the rated current by transistor MN4 and control node N_CTRL2.
When the demand current instantaneous reduction of load, superfluous electric current can pour in electric capacity CMP2 and CMN2 via outfan N_OUT, makes
Become the voltage rapid increase of node NDP4 and NDN4, the voltage rising of node NDN4 can cause transistor MN5 to close rapidly, and saves
The voltage rising of point NDP4 can cause to be significantly increased by the electric current of transistor MP5, and this electric current can cause control node N_CTRL2
Voltage quick and significantly rise, make transistor MN3 ' sink to a large amount of electric currents.By above-mentioned running, transistor MN3 ' can wink
Between formed and can sink to the path of a large amount of electric currents.It should be noted that between the grid of transistor MN4 and control node N_CTRL2
There is resistance RDCN, it is intended that when the voltage rapid increase of control node N_CTRL2, resistance RDCN can avoid crystal
The grid voltage of pipe MN4 rapid increase therewith, and cause transistor MN4 to make control node N_ quickly through a large amount of electric currents
The voltage of CTRL2 quickly returns fall (offsetting the change in voltage of control node N_CTRL2).In other words, resistance RDCN can reduce
The response speed of transistor MN4 is so that the voltage of control node N_CTRL2 has sunk to crystalline substance in the excess current of outfan N_OUT
Body pipe MN3 ' returns fall later again.
It should be noted that current source 10 also can be provided simultaneously with quickly providing a large amount of electric currents and quickly sink to a large amount of electric currents
Function.Refer to Fig. 4, Fig. 4 is the schematic diagram of the another embodiment of current source 10.The circuit structure of Fig. 4 can be considered Fig. 2
And the combination of the circuit structure of Fig. 3, therefore function identical assembly and signal all represent with same-sign.Wherein, the crystal of Fig. 4
The function of pipe MP3 and MN3 and function mode are identical with transistor MP3 and MN3 of Fig. 2 respectively, are also same as the transistor of Fig. 3
MP3 ' and MN3 '.Detailed Operation mode with regard to the circuit structure of Fig. 4 refers to the above-mentioned explanation being relevant to Fig. 2 and Fig. 3, here
Do not repeat.
The current source 10 of the present invention can be applicable to various types of manostat, for system requirements, stably to export one
To load end, in the case, the outfan of current source 10 may also be coupled to amplifier, divider resistance and other phase to rated voltage
Close assembly, to form the framework of manostat.Refer to Fig. 5, Fig. 5 is the schematic diagram of the embodiment of the present invention one manostat 50.As Fig. 5
Shown, manostat 50 includes current source 10 and a voltage stabilizing amplifier 500.Voltage stabilizing amplifier 500 can be used to lock manostat 50 defeated
Go out output voltage VO UT at end, it includes an amplifier 502 and divider resistance 504,506.The outfan of amplifier 502 couples
To the outfan of current source 10, using the outfan as manostat 50, for providing output voltage VO UT to load.Divider resistance
504th, 506 a feedback circuit can be formed, with according to a reference voltage Vref, by the steady state output voltage of manostat 50 outfan
VOUT is locked in a predetermined value.When the demand current of load end is fixing (under stable state), the value of output voltage VO UT be by
Voltage stabilizing amplifier 500 controls, and current source 10 does not affect the value of output voltage VO UT；When the demand current generation of load end is rapid
During change, then it is quickly to provide a large amount of electric currents by current source 10 or sink to a large amount of electric currents.
Refer to Fig. 6, Fig. 6 is a kind of schematic diagram of embodiment of manostat 50.As shown in fig. 6, current source 10 adopts
Circuit structure depicted in Fig. 4, and arrange in pairs or groups amplifier 502 in voltage stabilizing amplifier 500 and divider resistance 504,506 steady to realize
The circuit structure of depressor 50.Detailed Operation mode with regard to the circuit structure of Fig. 6 refers to above-mentioned be relevant to Fig. 2, Fig. 3 and Fig. 5
Explanation, will not be described here.
In one embodiment, current source 10 can not direct output current, but the electric current outputting it is turned by an impedance
It is changed to fast-changing output voltage, and then controls a buffer output current, and lifted by the thrust of buffer to negative
Carry the speed for induced current.Refer to Fig. 7, Fig. 7 is the schematic diagram of another manostat of the embodiment of the present invention 70.As shown in fig. 7, it is steady
Depressor 70 includes current source 10, a voltage stabilizing amplifier 700, a buffer 708 and a transfer resistance 710.Voltage stabilizing amplifier 700 can
It is used for locking output voltage VO UT of manostat 70 outfan, it includes an amplifier 702 and divider resistance 704,706.Put
The outfan of big device 702 is coupled to the outfan of buffer 708, using the outfan as manostat 70, for providing output electricity
Pressure VOUT is to load.Divider resistance 704,706 can form a feedback circuit, with according to a reference voltage Vref, by manostat 70
The steady state output voltage VOUT of outfan is locked in a predetermined value.Current source 10 can be carried out fast reaction institute by transfer resistance 710
The immediate current of output is converted to voltage, and produces quick change in voltage in fast reaction control end N_FAST.Quickly anti-
Answer control end N_FAST and then control buffer 708 to output current to load.(the stable state when the demand current of load end is fixing
Under), the value of output voltage VO UT is to be controlled by voltage stabilizing amplifier 700, and current source 10 and buffer 708 do not affect output electricity
The value of pressure VOUT；When the demand current of load end occurs rapid change, then it is by current source 10 and fast reaction control end
N_FAST controls buffer 708 quickly to provide a large amount of electric currents.
Refer to Fig. 8, Fig. 8 is a kind of schematic diagram of embodiment of manostat 70.As shown in figure 8, current source 10 adopts
Circuit structure depicted in Fig. 4 but connected mode are slightly different, and buffer 708 can be a N-type metal-oxide half field effect transistor MN0,
And arrange in pairs or groups amplifier 702 in voltage stabilizing amplifier 700 and divider resistance 704,706 and transfer resistance 710 are realizing manostat
70 circuit structure.One end of electric capacity CMP1, CMP2, CMN1 and CMN2 in current source 10 is coupled to the output of manostat 70
End, the other end is respectively coupled to node NDP1, NDP4, NDN1 and NDN4.The drain electrode of transistor MP3 and MN3 is then coupled to quickly
Reaction controlling end N_FAST.The grid of N-type metal-oxide half field effect transistor MN0 is coupled to fast reaction control end N_FAST, drain electrode
It is coupled to power source supply end, and source electrode is coupled to the outfan of manostat 70.In fig. 8, transfer resistance 710 is schematically shown as an electricity
Resistance, but in other embodiments, transfer resistance 710 also can be by connecting into the transistor (diode- of diode-connected
Connected transistor) realize, quickly anti-to be converted to, by its equivalent resistance, the electric current that current source 10 is exported
Answer control voltage V_FAST of control end N_FAST, and not limited to this.
Specifically, when the load transients of manostat 70 extract a large amount of electric current, by the fast reaction of current source 10, brilliant
Body pipe MP3 can export a large amount of electric currents moment.This electric current can flow to transfer resistance 710 via fast reaction control end N_FAST, makes
Obtain the control voltage V_FAST rapid increase of fast reaction control end N_FAST, and then control N-type metal-oxide half field effect transistor MN0
Moment exports a large amount of electric currents to loading, with the required electric current of quick offer load.Compared to by the direct output current of current source 10
To the mode of load, manostat 70 can lift, by the stronger buffer of thrust 708, the ability promoting load, can carry further
Rise the speed of output current.On the other hand, when declining the demand current moment of load, by the fast reaction of current source 10,
Transistor MN3 can sink to a large amount of electric currents moment.This electric current can be electric via fast reaction control end N_FAST from transfer resistance 710
Stream source 10 absorbs the control voltage V_FAST rapid decrease so that fast reaction control end N_FAST, and then controlling transistor MN0
Moment closes, and is reduced the size of output current or is stopped supply output current with rapid.
It should be noted that the running of fast reaction control end N_FAST controlling transistor MN0 to be made reaches optimization, quickly
Control voltage V_FAST of reaction controlling end N_FAST should be locked in a particular level under stable state.It is preferred that control voltage
V_FAST may be set to add a critical voltage (threshold of transistor MN0 equal or close to output voltage VO UT
Voltage size).In other words, control voltage V_FAST is about roughly equal to make transistor MN0 between unlatching and closing
Marginal value.Therefore, in a steady-state condition, control voltage V_FAST is located exactly at and can open N-type metal-oxide half field effect transistor MN0's
Level is so that transistor MN0 exports a small amount of electric current.When load transients extract a large amount of electric current, control voltage V_FAST only needs to
Somewhat lifting can export a large amount of electric currents controlling transistor MN0 moment.When output current is excessive, control voltage V_FAST is also only
Need somewhat to decline and can controlling transistor MN0 close.In the case, manostat 70 and current source 10 are to load transients electric current
The reaction of change can reach the fastest.If the level that control voltage V_FAST sets is too low, when load transients extract a large amount of electric current,
Control voltage V_FAST begin to ramp up to transistor MN0 open before have a bit of time transistor MN0 cannot output current；
On the other hand, if the level of control voltage V_FAST setting is too high, in addition to steady-state current possibility is excessive, when current source 10 is detectd
Measure output current excessive when, control voltage V_FAST drop to closing transistor MN0 before have a bit of time transistor
MN0 still may proceed to output current.
In manostat 70 circuit structure of Fig. 8, the steady state voltage of control voltage V_FAST is in stable state by current source 10
The resistance of the rated current under state and transfer resistance 710 determines.Due to technologic skew, no matter transfer resistance 710 passes through
Any type of resistance or connecting into the transistor of diode-connected to realize, all can there is a certain degree of mistake in its resistance
Difference, rated current there is also error simultaneously, causes the accuracy of the steady state voltage of control voltage V_FAST relatively low.Therefore, exist
In one embodiment, also voltage stabilizing amplifier can be coupled to fast reaction control end N_FAST, be existed with locking control voltage V_FAST
Bias under steady-state conditions.
Refer to Fig. 9, Fig. 9 is the schematic diagram of another manostat of the embodiment of the present invention 90.As shown in figure 9, manostat 90 wraps
Include current source 10, a voltage stabilizing amplifier 900 and a buffer 908.Voltage stabilizing amplifier 900 can be used to lock manostat 90 outfan
Output voltage VO UT, it includes an amplifier 902 and divider resistance 904,906.The outfan of amplifier 902 is coupled to one
Fast reaction control end N_FAST, 904,906 outfans being coupled to buffer 908 of divider resistance, using as manostat 90
Outfan, for provide output voltage VO UT to load.Divider resistance 904,906 can form a feedback circuit, with according to one
Reference voltage Vref, the steady state output voltage VOUT of manostat 90 outfan is locked in a predetermined value.Demand when load end
When electric current is fixing (under stable state), the value of output voltage VO UT is to be controlled by voltage stabilizing amplifier 900, and current source 10 does not affect
The value of output voltage VO UT；When the demand current of load end occurs rapid change, then it is by current source 10 and fast reaction
Control end N_FAST controls buffer 908 quickly to provide a large amount of electric currents.
Manostat 90 is with the Main Differences of manostat 70, and in manostat 70, the outfan of amplifier 702 is coupled to
The outfan of manostat 70, and in manostat 90, the outfan of amplifier 902 is then coupled to fast reaction control end N_
FAST, for controlling the bias (i.e. control voltage V_FAST under stable state) of fast reaction control end N_FAST.In this situation
Under, voltage stabilizing amplifier 900 can by the bias voltage control of fast reaction control end N_FAST in preferably level so that control voltage V_
FAST is equal or close to the size that output voltage VO UT adds the critical voltage of transistor MN0.Additionally, amplifier 902 etc.
Effect output impedance provides fast reaction control end N_FAST to the equivalent resistance of earth terminal, and therefore manostat 90 is not required to include again
Transfer resistance.
Refer to Figure 10, Figure 10 is a kind of schematic diagram of embodiment of manostat 90.As shown in Figure 10, current source 10 is adopted
With the circuit structure depicted in Fig. 4, its connected mode is same as the current source 10 of Fig. 8, and buffer 908 can be a N-type gold oxygen half
Field-effect transistor MN0, and arrange in pairs or groups amplifier 902 in voltage stabilizing amplifier 900 and divider resistance 904,906 are realizing manostat 90
Circuit structure.In Fig. 10, the function mode of N-type metal-oxide half field effect transistor MN0 and effect are same as the N-type gold oxygen of Fig. 8
Half field effect transistor MN0, is therefore represented with same-sign.Because manostat 90 does not include transfer resistance, amplifier 902 equivalent
Output impedance provides the function of being same as transfer resistance.Specifically, when the load transients of manostat 90 extract a large amount of electric currents
When, by the fast reaction of current source 10, transistor MP3 can export a large amount of electric currents moment.This electric current can be via fast reaction control
End N_FAST processed flow to the equivalent output impedance of amplifier 902 so that control voltage V_ of fast reaction control end N_FAST
FAST rapid increase, and then control N-type metal-oxide half field effect transistor MN0 moment to export a large amount of electric currents to loading, provided with quick
The required electric current of load.On the other hand, when declining the demand current moment of load, by the fast reaction of current source 10, brilliant
Body pipe MN3 can sink to a large amount of electric currents moment.This electric current can be from the equivalent output impedance of amplifier 902 via fast reaction control end
N_FAST is absorbed the control voltage V_FAST rapid decrease so that fast reaction control end N_FAST by current source 10, and then controls
Transistor MN0 moment processed closes, and is reduced the size of output current or is stopped supply output current with rapid.
Existing current source and manostat are (as U.S. Patent Publication No. US 2009/0212753A1 and United States Patent (USP) certificate number
US 7,105,033) all output voltage must be detected, to produce wilderness demand electric current in load transients and to detect defeated
When going out voltage and dropping to a certain degree, open instantaneous electric current source to supply the current needs of load end.Compared to existing electric current
Source is to adjust output current according to change in voltage, and the present invention is to adjust output current according to load current, therefore reacts speed
Degree is very fast.Specifically, due to the change of output voltage be loading demand electric current change caused by result, therefore, compared to
The change of detecting output voltage, directly adjusts output current according to load current and can reach response speed faster.Ideal state
Under, when circuit response speed is enough fast, change without waiting for output voltage, you can cause to export in the change of output current
Voltage provides load required electric current before producing fluctuation.Consequently, it is possible to the ripple that output voltage produces because load current changes
Move and will reduce to minimum so that manostat reaches optimal voltage regulation result.
It should be noted that the current source of the present invention can rapidly produce output when wilderness demand electric current in load
Electric current provides and gives load so that the fluctuation that output voltage produces because load current changes reduces to minimum, and then makes manostat
Voltage regulation result reaches optimization.Those skilled in the art can ought be modified according to this or be changed, and not limited to this.For example,
The realization of current source 10 according to system requirements, using the circuit structure shown in Fig. 2, Fig. 3 or Fig. 4, or can be tied using other circuit
Structure is exporting rapid-action electric current.Additionally, the implementation of manostat is also not necessarily limited to above-mentioned manostat 50,70 and 90.This
Bright current source can arrange in pairs or groups various different structures mu balanced circuit to realize different types of manostat, and not limited to this.
For example, for reaching more preferable stability, also can be anti-phase in the outfan of manostat 90 and amplifier 902
A miller compensation (Miller compensation) electric capacity is configured between output stage.Miller compensation electric capacity can be used to improve voltage stabilizing
The stability in the loop that amplifier 900 and buffer 908 are formed, reduces the bandwidth in described loop simultaneously, and then reduces voltage stabilizing
The response speed of amplifier 900.As described above, when the demand current of load occurs rapid change, being to be produced by current source 10
Fast reaction, and control voltage V_FAST of fast reaction control end N_FAST is adjusted by the output current of current source 10, with
Buffer 908 is controlled quickly to provide a large amount of electric currents.Therefore, the response speed reducing voltage stabilizing amplifier 900 can avoid voltage stabilizing to amplify
Device 900 is in short-term interior impact control voltage V_FAST so as to control buffer 908 quickly to provide the effect of electric current to be subject to shadow
Ring.
In sum, the current source of the present invention can quickly produce output current when increasing the demand current moment of load
Load is given in offer, also can be in the demand current instantaneous reduction of load, and the quick size reducing output current or offer are sunk to greatly
The path of amount electric current.Current source can directly export immediate current to load end, and also can control buffer provides the output electricity of moment
Stream, to lift the speed that load is supplied with induced current.Manostat using above-mentioned current source can be fast according to the demand current of load
Speed produces output current to avoid output voltage to produce big ups and downs, reaches optimal voltage regulation result whereby, avoids exporting simultaneously
Voltage is supported electric current and drags down and causes circuit malfunction.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of current source, for quick adjustment one first output current, described current source includes：
Certain current generating module, is coupled to a control node, flows through described control node for producing a rated current, with certainly
One voltage of fixed described control node；
One electric capacity, is coupled to an outfan of described current source；
One curent change detecting module, is coupled between described control node and described electric capacity, for the institute in described current source
When stating outfan and receiving instantaneous electric current change, a change is produced by the described voltage that described electric capacity makes described control node
Change；And
One transconcluctance amplifier, is coupled between described control node and described outfan, for described in described control node
When voltage produces described change, accordingly change the size of described first output current of described outfan.
2. current source as claimed in claim 1 is it is characterised in that also include：
One resistance, be coupled to described control node and described determine between current generating module, for avoid described determine electric current produce
Module produces the described change that another immediate current offsets the described voltage of described control node.
3. current source as claimed in claim 1 is it is characterised in that the described outfan of described current source is coupled to a buffering
Device, to control described buffer to export one second output current.
4. current source as claimed in claim 3 is it is characterised in that described buffer is a N-type metal-oxide half field effect transistor, its
One drain electrode is coupled to a power source supply end, a source electrode is coupled to described electric capacity and a grid is coupled to described outfan, described
Current source, according to a load change of the described source electrode of described N-type metal-oxide half field effect transistor, controls described N-type MOSFET
Transistor exports described second output current.
5. current source as claimed in claim 1 is it is characterised in that described determine current generating module and include a current mirror, with
Under stable state, the size of described first output current is controlled to be equal to the size of described rated current.
6. a kind of manostat, including：
One buffer, is coupled between an outfan of described manostat and a fast reaction control end, for producing an output
Electric current；
One current source, is coupled to described buffer, and described current source includes：
Certain current generating module, is coupled to a control node, flows through described control node for producing a rated current, with certainly
One voltage of fixed described control node；
One electric capacity, is coupled to the described outfan of described manostat；
One curent change detecting module, is coupled between described control node and described electric capacity, for the institute in described manostat
When stating outfan and receiving instantaneous electric current change, a change is produced by the described voltage that described electric capacity makes described control node
Change；And
One transconcluctance amplifier, is coupled between described control node and described fast reaction control end, for controlling section described
When the described voltage of point produces described change, produce a corresponding output signal in described fast reaction control end, to control
Described buffer changes the size of described output current；And
One voltage stabilizing amplifier, is coupled between the described outfan of described manostat and described fast reaction control end, for locking
One output voltage of fixed described outfan, and determine a bias of described fast reaction control end.
7. manostat as claimed in claim 6 is it is characterised in that described current source also includes：
One resistance, be coupled to described control node and described determine between current generating module, for avoid described determine electric current produce
Module produces the described change that another immediate current offsets the described voltage of described control node.
8. manostat as claimed in claim 6 is it is characterised in that described buffer is a N-type metal-oxide half field effect transistor, institute
The drain electrode stating N-type metal-oxide half field effect transistor is coupled to a power source supply end, a source electrode is coupled to the described of described manostat
Outfan and a grid are coupled to described fast reaction control end.
9. manostat as claimed in claim 8 is it is characterised in that described fast reaction control end is coupled to described voltage stabilizing amplification
One outfan of device, is equal or close to described output voltage with the described bias controlling described fast reaction control end and adds institute
State the size of a critical voltage of N-type metal-oxide half field effect transistor.
10. manostat as claimed in claim 6 is it is characterised in that also include：
One miller compensation electric capacity, is coupled to the anti-phase output in the described outfan and described voltage stabilizing amplifier of described manostat
Between level, for improving the stability in the loop that described voltage stabilizing amplifier is formed with described buffer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410347409.0A CN105278601B (en) | 2014-07-21 | 2014-07-21 | Current source for manostat and its manostat |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410347409.0A CN105278601B (en) | 2014-07-21 | 2014-07-21 | Current source for manostat and its manostat |
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| CN105278601A CN105278601A (en) | 2016-01-27 |
| CN105278601B true CN105278601B (en) | 2017-03-01 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6054901A (en) * | 1997-10-02 | 2000-04-25 | Motorola, Inc. | Low noise preamplifier |
| CN1208702C (en) * | 2003-03-06 | 2005-06-29 | 威盛电子股份有限公司 | Voltage stabilizing circuit with current mirror to compensate current and prevent initial overcurrent and its contol method |
| US7714553B2 (en) * | 2008-02-21 | 2010-05-11 | Mediatek Inc. | Voltage regulator having fast response to abrupt load transients |
| CN102841624B (en) * | 2011-06-24 | 2015-09-16 | 联咏科技股份有限公司 | Rapid reaction current source |
| US8710811B2 (en) * | 2012-01-03 | 2014-04-29 | Nan Ya Technology Corporation | Voltage regulator with improved voltage regulator response and reduced voltage drop |
| CN103838286B (en) * | 2012-11-20 | 2015-11-25 | 遵义师范学院 | The low pressure difference linear voltage regulator of a kind of fast transient response, high stability |
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