CN105099185B - Voltage stabilizing control method - Google Patents
Voltage stabilizing control method Download PDFInfo
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- CN105099185B CN105099185B CN201410201637.7A CN201410201637A CN105099185B CN 105099185 B CN105099185 B CN 105099185B CN 201410201637 A CN201410201637 A CN 201410201637A CN 105099185 B CN105099185 B CN 105099185B
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Abstract
Present invention system discloses a kind of voltage stabilizing control method, first, the load voltage in one load of partial pressure, to produce a feedback voltage.Then, feedback voltage and a cycle triangular wave signal with positive and negative voltage are received, and is added this feedback voltage and triangular wave signal, to produce a summation signal.Afterwards, compare summation signal and a target voltage, when summation signal is less than target voltage, produce the control signal that electronic switch can be controlled to carry out switch switching.Finally, this electronic switch receives control signal, and updates load voltage using an input voltage accordingly, to avoid in load instantaneous or stable state, the unstable situation of load voltage occurs.
Description
Technical field
The present invention is, on the control method in a kind of power-supply management system, to especially relate to be used for voltage stabilizing on one kind
Control method.
Background technology
The adjustment system of the supply of electric power of integrated circuit is using coboundary field-effect transistor (high-side FET) with
Border field-effect transistor (low-side FET) is used as the design on control circuit of voltage x current.Electric current is imitated by coboundary
Load is flowed at the junction or node that the source electrode of transistor is connected with the drain electrode of lower boundary field-effect transistor.This load system with
Inductor is concatenated, and is to have capacitor to load and connect with this.When the cycle starts, coboundary field-effect transistor is conducting, lower boundary
Field-effect transistor is cut-off, and electric current system flows to inductor, capacitor and load via the coboundary field-effect transistor of conducting.This
Electric current will rise the stored quantity of electric charge of capacitor.And when load institute across voltage reach target level when, on causing
Boundary field effect transistors switch is cut-off, and lower boundary field-effect transistor switches to conducting, and now electric current will be via capacitor discharge.
Therefore by coboundary field-effect transistor and lower boundary field-effect transistor turn on end interact switching so that output voltage general
Do not changed with rising or falling for inductive current.
Shown in 1st figure, the switching control of conventional art includes comparison controller 10, a coboundary field-effect
Transistor (high-side FET) 12 and a lower boundary field-effect transistor (low-side FET) 14.This coboundary
The drain electrode of effect transistor 12 is electrically connected under input voltage source VIN, and the source electrode system of this coboundary field-effect transistor 12 and this
The drain electrode of border field-effect transistor 14 is electrically connected with.The source electrode of this lower boundary field-effect transistor 14 is attached to earth terminal.And this
The grid of the grid of coboundary field-effect transistor 12 and this lower boundary field-effect transistor 14 does electricity with the comparison controller 10 respectively
Property connection.When enough voltage is acted on transistor gate, corresponding electric current will be produced between drain electrode and source electrode.Through
By the control operation of voltage x current, make the grid of this coboundary field-effect transistor 12 and the grid of this lower boundary field-effect transistor 14
System is by interaction conducting with ending.In addition, an inductor 16 is attached under the source electrode of this coboundary field-effect transistor 12 and this
At the junction that the drain electrode of border field-effect transistor 14 is connected.And a load 18 be serially connected with this inductor 16 and earth terminal it
Between, and this load 18 is that would span across an output voltage Vo.
When this coboundary field-effect transistor 12 and this lower boundary field-effect transistor 14 will turn on the switching with ending,
The grid of transistor is with being that will keep former on or off for a period of time.And output voltage Vo is sampled by bleeder circuit 20
To obtain a feedback voltage F.This feedback voltage F systems are compared via comparison controller 10 with a target voltage T-phase, wherein this mesh
Voltage T is marked as produced by a target voltage generator 22.When this feedback voltage F is equal to this target voltage T, this compares control
Device 10 processed is that will produce triggering signal so that coboundary field-effect transistor 12 is turned on respectively with this lower boundary field-effect transistor 14
With the switching of cut-off.In addition, being to there is a capacitor 24 to load 18 with this and connect.This capacitor 24 is that delay is across into this to bear
The output voltage of load 18 loads 18 electric current with respect to this.So just it will cause output voltage Vo's unstable.
As described above, this known switching control system goes to adjust output current using output voltage Vo ripple.No
It is quite unsuitable for some circuit applications to cross this ripple.Therefore control will be gone by an equivalent series resistance (ESR) 26
Output voltage Vo processed rise and fall.To reach this purpose, this equivalent series resistance 26 need to be large enough that this capacitor
24 act as resistor, make the phase system for being across the output voltage Vo of this load 18 relatively leading by being loaded in this
108 electric current, and then make stable operation.
For example, it must be matched using ceramic capacitor with the equivalent series resistance 26 of about 20 (megohms), but made
It must then be matched with tantalum material capacitor with about 200-600 (megohm) equivalent series resistance 26.However, the meter of matching
Calculate extremely difficult for designer.Due to comparison controller 10 and field-effect transistor 12,14 be for the first producer it is made
Encapsulation is made, and it is as manufactured by the second producer to load 18 with capacitor 24.Therefore, this equivalent series resistance 26 be generally via
First producer is controlled, in addition, the method that can be manufactured with the manufacture system of the capacitor 24 of this collocation of equivalent series resistance 26,
The factor such as material and temperature influences.
Therefore, the present invention is tied up to for above-mentioned puzzlement, it is proposed that a kind of voltage stabilizing control method, to solve known existing skill
The problem that art.
The content of the invention
The main object of the present invention, is to provide a kind of voltage stabilizing control method, and it is to utilize the triangle with positive and negative voltage
Ripple signal produces the control signal that can switch with controlling switch, and then reaches in load steady state or transient change, stablizes defeated
Go out the effect of voltage.
For up to above-mentioned purpose, the present invention provides a kind of voltage stabilizing control method, first, the upper load electricity of one load of partial pressure
Pressure, to produce a feedback voltage.Then, feedback voltage and a cycle triangular wave signal are received, and triangular wave signal has
Positive voltage and negative voltage, and feedback voltage and triangular wave signal are added, to produce a summation signal.Come again, relatively more total Homeway.com
Number and a target voltage, summation signal be less than target voltage when, produce one control signal.Finally, an electronics is utilized
Switch is updated and steady load voltage using an input voltage accordingly with receiving control signal.
Hereby to make each reader more have further understanding and understanding to the architectural feature of the present invention and the effect reached,
Careful assistant is described in detail with preferred embodiment figure and coordinating, and illustrate such as content hereinafter.
In a kind of voltage stabilizing control method of the present invention, comprise the steps of：One load voltage loaded is carried out
Partial pressure, to produce a feedback voltage or feedback voltage；Receive the feedback voltage and a cycle triangular wave signal, and this three
Angle ripple signal has positive voltage and negative voltage, and is added the feedback voltage and the triangular wave signal, to produce a summation signal；
Compare the summation signal and a target voltage, and when the summation signal is less than the target voltage, produce a control signal；
And the control signal is received, and updated accordingly using an input voltage and stablize the load voltage.
The above method, the average value of the triangular wave signal is zero.
The above method, the production method of the triangular wave signal further includes the following steps：Receive a cycle trapezoidal wave news
Number, each trapezoidal wave of the trapezoidal wave signal has an initial voltage, a sample signal and an end according to time order and function
Voltage, the absolute value of the initial voltage is more than the absolute value of the final voltage；And the initial voltage in a upper cycle was captured with being somebody's turn to do
The average value of final voltage, and the sample signal in next cycle is subtracted with the average value, to produce the triangular wave signal.
The above method, the production method of the triangular wave signal further includes the following steps：Receive a cycle trapezoidal wave news
Number, each trapezoidal wave of the trapezoidal wave signal has an initial voltage, a sample signal and an end electricity according to time order and function
Pressure, the absolute value of the initial voltage is more than the absolute value of the final voltage；And captured the final voltage in a upper cycle and next week
The average value of the initial voltage of phase, and the sample signal in next cycle is subtracted with the average value, to produce the triangular wave
Signal.
The above method, the production method of the triangular wave signal further includes the following steps：Receive a cycle first trapezoidal
Ripple signal and a periodically second trapezoidal wave signal, each first trapezoidal wave of the first trapezoidal wave signal have according to time order and function
There are first initial voltage, a sample signal and first final voltage, the absolute value of first initial voltage is more than should
The absolute value of first final voltage, each second trapezoidal wave of the second trapezoidal wave signal has second initial voltage and one
Individual second final voltage, the absolute value of second initial voltage is less than the absolute value of second final voltage, and adjacent two this
Only occurs second trapezoidal wave between one trapezoidal wave；And in adjacent second trapezoidal wave of time order and function and first ladder
In shape ripple, the average value of second initial voltage and second final voltage is captured, and the sample signal is subtracted with the average value, with
Produce the triangular wave signal.
The above method, this controls signal to be high levle signal.
The above method, initial voltage and the final voltage of each and every one each triangular wave of the triangular wave signal are respectively crest voltage
With valley point voltage.
The above method, the load connects a divider, and it is the partial pressure load voltage, to produce the feedback voltage.
Above-mentioned method, the load connects first electronic switch and second electronic switch, second electronic cutting
Ground connection is closed, first electronic switch receives the control signal, and updated using the input voltage according to the control signal and stably
The load voltage.
The above method, the load is connected in parallel with a capacitor.
The above method, second electronic switch connects a triangular wave generator, and it is connected an addition with the divider
Device, the triangular wave generator receives the voltage drop across second electronic switch, is added with producing the triangular wave signal accordingly to this
Musical instruments used in a Buddhist or Taoist mass, the divider transmits the feedback voltage to the adder, and the adder is added the feedback voltage and the triangular wave signal, with
Produce the summation signal.
The above method, the adder is connected a comparison controller, the comparison controller with a target voltage generator
First electronic switch and second electronic switch are connected, the comparison controller receives the target voltage of the target voltage generation
With the summation signal, by its relatively after, produce the control signal and give first electronic switch, and drive second electronic switch.
The above method, when first electronic switch is opens, second electronic switch is closes, and first electronic switch is
During closing, second electronic switch is unlatching.
Brief description of the drawings
With reference to appended accompanying drawing, more fully to describe embodiments of the invention.However, appended accompanying drawing be merely to illustrate and
Illustrate, and be not meant to limit the scope of the invention.
Fig. 1 is the circuit diagram of the switching control of prior art.
Fig. 2 is the circuit diagram of the switching control using first embodiment of the present invention.
Fig. 3 is each signal waveform schematic diagram using first embodiment of the present invention.
Fig. 4 is the circuit diagram of the switching control using second embodiment of the present invention.
Fig. 5 is each signal waveform schematic diagram using second embodiment of the present invention.
Embodiment
The 2nd figure is referred to, the switching control of the present invention includes first electronic switch 28 and second electronics
Switch 30, it is that all by taking field-effect transistor as an example, igbt (Insulated Gate can also be used in addition
Bipolar Transistor, IGBT) or bipolar junction transistors (Bipolar Junction Transistor, BJT) work
It is practiced for demonstration, but not limited to this.First electronic switch 28 connection input voltage source 31, a comparison controller 32 and the
Two electronic switches 30.Second electronic switch 30 is grounded (such as source ground), and connects comparison controller 32.Comparison controller 32 connects
Connect a target voltage generator 34.First electronic switch 28 is connected one through an inductance 36 jointly with the second electronic switch 30
One end of individual load 38, switching node and output loading voltage V that such as inductance 36 may connect between switch 28,30OIt is defeated
Between the one end for going out end or load 38, the other end of load 38 is then grounded.In addition, load 38 is also with an electric capacity 40 and with one
Individual divider 42 is in parallel.Produced as a triangular wave is connected between the source electrode of the field-effect transistor of the second electronic switch 30 and drain electrode
Raw device 44, this triangular wave generator 44 is connected an adder 46 simultaneously with divider 42, and control is compared in the connection of adder 46
Device 32.
This switching control mainly produces control signal (signal is also referred to as signal) C or one using comparison controller 32
Close signal D makes it carry out switch switching to the first electronic switch 28, is cut while also driving the second electronic switch 30 to carry out switch
Change, the control end of such as grid or base stage of the driving switch 28,30 of comparison controller 32.When the first electronic switch 28 receives conduct
It is that an input voltage V is utilized according to control signal C when controlling signal C high levle signal (also known as logic high signal)INMore
Load voltage V in new and steady load 38O.Now, the first electronic switch 28 is opened, and the second electronic switch 30 may turn off,
Therefore, input voltage source 31 will provide an input voltage V through the first electronic switch 28IN, inductance 36 is produced an electricity
Inducing current IL, this inductive current IL38 it can be flowed toward load with electric capacity 40, wherein from inductive current ILThe past load 38 branched away is flowed
Dynamic current definition is output current IO.In addition, when the first electronic switch 28 is received as the low level signal for closing signal D
When (also known as logic low signal), the first electronic switch 28 is closed, and the second electronic switch 30 may turn on, now, and electric current can be from
Electric capacity 40 sequentially by the second electronic switch 30 and inductance 36 and is tapered into.
The first embodiment of the present invention introduced below, please refer to the 3rd figure.First, comparison controller 32 provides conduct
Control signal C high levle signal to the first electronic switch 28, while driving the second electronic switch 30, make the first electronic switch 28
It is separately turned on and closes with the second electronic switch 30, then input voltage source 31 will be defeated through the first electronic switch 28 offer one
Enter voltage VIN, inductance 36 is produced an inductive current IL, this inductive current ILIt can be flowed toward load 38 with electric capacity 40, with negative
Carry and a load voltage V is produced on 38O, so utilizing this load voltage of partial pressure of divider 42 VO, to produce a feedback voltage
(feedback voltage is also referred to as feedback voltage) F.Meanwhile, comparison controller 32 is set according to user, makes the first electronic switch 28 and second
Electronic switch 30 is separately turned on after being continued for some time with closing, such as 1 microsecond (us), into cycle T 1, while comparing control
Device 32 provides the low level signal as closing signal D to the first electronic switch 28, and drives the second electronic switch 30, makes first
Electronic switch 28 is exchanged with the on off state of the second electronic switch 30, due to now inductive current ILCan more and more small, Gu Qibo
Shape is trapezoidal wave as shown in Figure 3.Now, triangular wave generator 44 receives the voltage drop across the second electronic switch 30, that is, makees
The voltage drop V between source electrode and drain electrode for the field-effect transistor of the second electronic switch 30DS, it is also trapezoidal to obtain a cycle
First trapezoidal wave of ripple signal, each trapezoidal wave of this trapezoidal wave signal according to time order and function have an initial voltage, one
Sample signal and a final voltage, the absolute value of initial voltage are more than the absolute value of final voltage.Then, triangular wave generator 44 is picked
Take (or sample, take) initial voltage of this cycle T 1 and the average value of final voltage and stored, while not exporting any
Signal.
Then, at the end of cycle T 1, because triangular wave generator 44 does not export any signal, therefore adder 46 will be returned
Voltage F is awarded to export to comparison controller 32 as a summation signal S.Comparison controller 32 receives and compares this summation signal S
With a target voltage T produced by target voltage generator 34, when detection finds that summation signal S is less than target voltage T, so
Then comparison controller 32 provides the high levle signal as control signal C to the first electronic switch 28, while the electricity of driving second
Sub switch 30, makes the first electronic switch 28 be separately turned on and close with the second electronic switch 30, then input voltage source 31 will be saturating
Cross the first electronic switch 28 and input voltage V is provided againIN, update and the load voltage V in steady load 38O, while divider
42 by this load voltage VOProduce feedback voltage F.Meanwhile, comparison controller 32 is set according to user, makes the first electronic switch
28 and second electronic switch 30 be separately turned on after being continued for some time with closing, such as 1 microsecond (us), into cycle T 2, simultaneously
Comparison controller 32 provides the low level signal as closing signal D to the first electronic switch 28, and drives the second electronic switch
30, exchange the first electronic switch 28 and the on off state of the second electronic switch 30.Now, triangular wave generator 44 receives conduct
The source electrode of the field-effect transistor of second electronic switch 30 and the voltage drop V of drain electrodeDS, to obtain the second of periodic trapezoidal-type waveform signal
Individual trapezoidal wave.Triangular wave generator 44 is in the sample signal of second trapezoidal wave of acquirement, while being stored up using a upper cycle T 1
The average value deposited subtracts the sample signal of this cycle T 2, just can produce a cycle triangular wave signal A first triangular wave,
Each triangle wave system of wherein this triangular wave signal has positive voltage and negative voltage, and triangular wave signal A each triangle
The initial voltage of ripple and final voltage are respectively crest voltage and valley point voltage.In addition, triangular wave generator 44 can equally obtained
During second trapezoidal wave, capture and store the initial voltage of this cycle T 2 and the average value of final voltage.
Then, at the end of cycle T 2, because adder 46 receives first triangular wave and feedback electricity of triangular wave signal
F is pressed, and is added, is exported with producing a summation signal S to comparison controller 32.Comparison controller 32 receives and compares this
Summation signal S and target voltage T, when detection finds that summation signal S is less than target voltage T, so then comparison controller 32 is carried
It is provided as controlling signal C high levle signal to the first electronic switch 28, while driving the second electronic switch 30, makes the first electronics
Switch 28 is separately turned on and closed with the second electronic switch 30, then input voltage source 31 will be through the first electronic switch 28 again
Input voltage V is providedIN, update and the load voltage V in steady load 38O, while divider 42 thereby produces feedback voltage F.
Meanwhile, comparison controller 32 is set according to user, the first electronic switch 28 is separately turned on and is closed with the second electronic switch 30
After continuing for some time, such as 1 microsecond (us), into cycle T 3, while comparison controller 32 is provided as the low of closing signal D
Level signal gives the first electronic switch 28, and drives the second electronic switch 30, makes the first electronic switch 28 and the second electronic switch
30 on off state is exchanged.Now, triangular wave generator 44 receives the source of the field-effect transistor as the second electronic switch 30
Pole and the voltage drop V of drain electrodeDS, to obtain the 3rd trapezoidal wave of periodic trapezoidal-type waveform signal.Triangular wave generator 44 is being obtained
During the sample signal of the 3rd trapezoidal wave, while subtracting the sampling news of this cycle T 3 using the stored average value of a upper cycle T 2
Number, it just can produce periodic triangular ripple signal A second triangular wave with positive voltage and negative voltage.In addition, triangular wave is produced
Raw device 44 can equally be captured when obtaining the 3rd trapezoidal wave and store the initial voltage of this cycle T 3 and being averaged for final voltage
Value.
According to the function mode of the preceding paragraph, the switching control of the present invention can be produced periodically in next cycle T4
The 3rd triangular wave with positive voltage and negative voltage of 4th trapezoidal wave of trapezoidal wave signal and periodic triangular ripple signal,
Even can constantly it be operated down in subsequent cycle, the average value system to this last triangular wave signal is zero.
Above-mentioned triangular wave generator 44 can also not be connected to source electrode as the field-effect transistor of the second electronic switch 30 with
Drain electrode, if but can still produce the triangular wave signal A such as identical sequential in the 3rd figure to adder 46, it need not can calculate trapezoidal
Ripple signal, can still complete to update and steady load voltage VOPurpose.
Below with same circuit, illustrate another function mode.First, comparison controller 32 is provided as control signal
C high levle signal gives the first electronic switch 28, while driving the second electronic switch 30, makes the first electronic switch 28 and the second electricity
Sub switch 30 is separately turned on and closed, then input voltage source 31 will provide an input voltage through the first electronic switch 28
VIN, inductance 36 is produced an inductive current IL, this inductive current ILIt can be flowed toward load 38 with electric capacity 40, with load 38
Produce a load voltage VO, so utilizing this load voltage of partial pressure of divider 42 VO, to produce a feedback voltage F.Meanwhile,
Comparison controller 32 is set according to user, makes the first electronic switch 28 and the second electronic switch 30 be separately turned on continuing one with closing
After the section time, such as 1 microsecond (us), into cycle T 1, while comparison controller 32 is provided as the low level news for closing signal D
Number the first electronic switch 28 is given, and drive the second electronic switch 30, make opening for the first electronic switch 28 and the second electronic switch 30
Off status is exchanged, due to now inductive current ILCan be more and more small, it is trapezoidal wave as shown in Figure 3.Now, triangular wave is produced
Device 44 receives the voltage drop across the second electronic switch 30, i.e., as the second electronic switch 30 field-effect transistor source electrode and leakage
The voltage drop V of interpolarDS, also to obtain first trapezoidal wave of a cycle trapezoidal wave signal, this trapezoidal wave signal it is each
Trapezoidal wave has an initial voltage, a sample signal and a final voltage according to time order and function, and the absolute value of initial voltage is big
In the absolute value of final voltage.Then, the final voltage of this cycle T 1 of the acquisition of triangular wave generator 44 is to store it, while not exporting
Any signal.
Then, at the end of cycle T 1, because triangular wave generator 44 does not export any signal, therefore adder 46 will be returned
Voltage F is awarded to export to comparison controller 32 as a summation signal S.Comparison controller 32 receives and compares this summation signal S
With target voltage T one of produced by target voltage generator 34, when detection finds that summation signal S is less than target voltage T, so connecing
Comparison controller 32 and provide the high levle signal as control signal C to the first electronic switch 28, while driving the second electronics
Switch 30, makes the first electronic switch 28 be separately turned on and close with the second electronic switch 30, then input voltage source 31 will be passed through
First electronic switch 28 provides input voltage V againIN, update and the load voltage V in steady load 38O, while divider 42
Thereby load voltage VOProduce feedback voltage F.Meanwhile, comparison controller 32 is set according to user, make the first electronic switch 28 with
Second electronic switch 30 is separately turned on after being continued for some time with closing, such as 1 microsecond (us), into cycle T 2, is compared simultaneously
Controller 32 provides the low level signal as closing signal D to the first electronic switch 28, and drives the second electronic switch 30, makes
First electronic switch 28 is exchanged with the on off state of the second electronic switch 30.Now, triangular wave generator 44 is received as second
Voltage drop V between the source electrode of the field-effect transistor of electronic switch 30 and drain electrodeDS, to obtain second of periodic trapezoidal-type waveform signal
Trapezoidal wave, and capture the average value of initial voltage and the final voltage in first trapezoidal wave of second trapezoidal wave and stored,
The final voltage of second trapezoidal wave is stored simultaneously.Triangular wave generator 44 is in the sample signal of second trapezoidal wave of acquirement, together
This average value of Shi Liyong subtracts the sample signal of this cycle T 2, just can produce first three of a cycle triangular wave signal A
Each triangle wave system of angle ripple, wherein this triangular wave signal has a positive voltage and negative voltage, and triangular wave signal A each
The initial voltage of triangular wave and final voltage are respectively crest voltage and valley point voltage.
Then, at the end of cycle T 2, because adder 46 receives first triangular wave and feedback electricity of triangular wave signal
F is pressed, and mutually in addition, is exported with producing a summation signal S to comparison controller 32.Comparison controller 32 is received and to compare this total
With signal S and target voltage T, it is found that summation signal S is less than target voltage T, so then comparison controller 32 is provided as control
Signal C processed high levle signal gives the first electronic switch 28, while drive the second electronic switch 30, make the first electronic switch 28 with
Second electronic switch 30 is separately turned on and closed, then input voltage source 31 will provide input again through the first electronic switch 28
Voltage VIN, update and the load voltage V in steady load 38O, while divider 42 thereby produces feedback voltage F.Meanwhile, compare
Controller 32 is set according to user, when making the first electronic switch 28 and the second electronic switch 30 be separately turned on continuing one section with closing
Between after, such as 1 microsecond (us), into cycle T 3, while comparison controller 32 provide as close signal D low level signal to
First electronic switch 28, and the second electronic switch 30 is driven, make the switch shape of the first electronic switch 28 and the second electronic switch 30
State is exchanged.Now, triangular wave generator 44 is received as between the source electrode of the field-effect transistor of the second electronic switch 30 and drain electrode
Voltage drop VDS, to obtain the 3rd trapezoidal wave of periodic trapezoidal-type waveform signal, and capture the initial voltage of the 3rd trapezoidal wave
It is stored with the average value of the final voltage in second trapezoidal wave, while storing the final voltage of the 3rd trapezoidal wave.Triangular wave is produced
Raw device 44 is in the sample signal of the 3rd trapezoidal wave of acquirement, while the sample signal of this cycle T 3 is subtracted using this average value,
Just periodic triangular ripple signal A second triangular wave with positive voltage and negative voltage can be produced.
According to the function mode of the preceding paragraph, the switching control of the present invention can be produced periodically in next cycle T4
The 3rd triangular wave with positive voltage and negative voltage of 4th trapezoidal wave of trapezoidal wave signal and periodic triangular ripple signal,
Even can constantly it be operated down in subsequent cycle, the average value system to this last triangular wave signal is zero.
The second embodiment of the present invention introduced below, please refer to the 4th figure and the 5th figure, wherein the 4th figure and the 2nd figure it
Difference is only that, triangular wave generator is also connected as between the source electrode of the field-effect transistor of the first electronic switch 28 and drain electrode
44.First, comparison controller 32 provides high levle signal as control signal C to the first electronic switch 28, while driving the
Two electronic switches 30, make the first electronic switch 28 be separately turned on and close with the second electronic switch 30, then input voltage source 31 is just
An input voltage V can be provided through the first electronic switch 28IN, inductance 36 is produced an inductive current IL, this inductive current
ILIt can be flowed toward load 38 with electric capacity 40, with one load voltage V of generation in load 38O, so using the partial pressure of divider 42 this
Load voltage VO, to produce a feedback voltage F.Meanwhile, comparison controller 32 is set according to user, makes the first electronic switch 28
It is separately turned on the second electronic switch 30 after being continued for some time with closing, such as 1 microsecond (us), into cycle T 1, while than
There is provided compared with controller 32 as closing signal D low level signal to the first electronic switch 28, and drive the second electronic switch 30,
Exchange the first electronic switch 28 and the on off state of the second electronic switch 30, due to now inductive current ILCan be more and more small,
It is trapezoidal wave therefore its waveform is as shown in Figure 3.Now, triangular wave generator 44 receives the voltage across the second electronic switch 30
Drop, i.e., as the second electronic switch 30 field-effect transistor source electrode and drain between voltage drop VDS, a week can also be obtained
First the first trapezoidal wave of phase property the first trapezoidal wave signal, each first trapezoidal wave of this first trapezoidal wave signal is according to the time
Successively there is first initial voltage, a sample signal and first final voltage, the absolute value of the first initial voltage is big
In the absolute value of the first final voltage.Then, triangular wave generator 44 does not export any signal.
Then, at the end of cycle T 1, because triangular wave generator 44 does not export any signal, therefore adder 46 will be returned
Voltage F is awarded to export to comparison controller 32 as a summation signal S.Comparison controller 32 receives and compares this summation signal S
With target voltage T one of produced by target voltage generator 34, detection finds that summation signal S is less than target voltage T, so then
Comparison controller 32 provides the high levle signal as control signal C to the first electronic switch 28, while driving the second electronic cutting
Close 30, the first electronic switch 28 is separately turned on and is closed with the second electronic switch 30, then input voltage source 31 will pass through or
Input voltage V is provided again by the first electronic switch 28IN, update and the load voltage V in steady load 38O, while partial pressure
Device 42 is by this load voltage VOProduce feedback voltage F.Meanwhile, comparison controller 32 is set according to user, makes the first electronic cutting
The electronic switch 30 of pass 28 and second is separately turned on continuing for some time T1', such as 1 microsecond (us) with closing.In time T1',
Inductive current ILCan be more and more big, therefore its waveform is as shown in Figure 5, is trapezoidal wave.Now, triangular wave generator 44 receive across
The voltage drop of first electronic switch 28, i.e., as the first electronic switch 30 field-effect transistor source electrode and drain electrode between voltage
V dropsSD, also to obtain first the second trapezoidal wave of a cycle the second trapezoidal wave signal, this second trapezoidal wave signal is every
One the second trapezoidal wave has second initial voltage and second final voltage, and the absolute value of the second initial voltage is less than the
The absolute value of two final voltages, and only there is second trapezoidal wave between adjacent two the first trapezoidal waves.Triangular wave generator
44 capture the average value of the second initial voltage of times T1' and the second final voltage, and after being stored, into cycle T 2, simultaneously
Comparison controller 32 provides the low level signal as closing signal D to the first electronic switch 28, and drives the second electronic switch
30, exchange the first electronic switch 28 and the on off state of the second electronic switch 30.Now, triangular wave generator 44 receives conduct
Voltage drop V between the source electrode of the field-effect transistor of second electronic switch 30 and drain electrodeDS, with obtain periodic trapezoidal-type waveform signal it
Second trapezoidal wave.Triangular wave generator 44 is in the sample signal of second trapezoidal wave of acquirement, while being stored up using time T1'
The average value deposited subtracts the sample signal of this cycle T 2, just can produce a cycle triangular wave signal A first triangular wave,
Each triangle wave system of wherein this triangular wave signal has positive voltage and negative voltage, and triangular wave signal A each triangle
The initial voltage of ripple and final voltage are respectively crest voltage and valley point voltage.
Then, at the end of cycle T 2, because adder 46 receives first triangular wave and feedback electricity of triangular wave signal
F is pressed, and mutually in addition, is exported with producing a summation signal S to comparison controller 32.Comparison controller 32 is received and to compare this total
With signal S and target voltage T, it is found that summation signal S is less than target voltage T, so then comparison controller 32 is provided as control
Signal C processed high levle signal gives the first electronic switch 28, while drive the second electronic switch 30, make the first electronic switch 28 with
Second electronic switch 30 is separately turned on and closed, then input voltage source 31 will provide input again through the first electronic switch 28
Voltage VIN, update and the load voltage V in steady load 38O, while divider 42 thereby produces feedback voltage F.Meanwhile, compare
Controller 32 is set according to user, when making the first electronic switch 28 and the second electronic switch 30 be separately turned on continuing one section with closing
Between T2', such as 1 microsecond (us).In time T2', inductive current ILCan be more and more big.Now, triangular wave generator 44 is received
Across the voltage drop of the first electronic switch 28, to obtain second the second trapezoidal wave of a cycle the second trapezoidal wave signal.
Triangular wave generator 44 captures the average value of the second initial voltage and the second final voltage of time T2', and after being stored, entrance
Cycle T 3, while comparison controller 32 is provided as closing signal D low level signal to the first electronic switch 28, and drives the
Two electronic switches 30, exchange the first electronic switch 28 and the on off state of the second electronic switch 30.Now, triangular wave generator
44 receive as the voltage drop V between the source electrode of the field-effect transistor of the second electronic switch 30 and drain electrodeDS, to obtain periodically ladder
3rd trapezoidal wave of shape ripple signal.Triangular wave generator 44 is utilized simultaneously in the sample signal of the 3rd trapezoidal wave of acquirement
Average value stored time T2' subtracts the sample signal of this cycle T 3, and just can produce periodic triangular ripple signal A has just
Second triangular wave of voltage and negative voltage.
According to the function mode of the preceding paragraph, the switching control of the present invention can be produced periodically in next cycle T4
The 3rd triangular wave with positive voltage and negative voltage of 4th trapezoidal wave of trapezoidal wave signal and periodic triangular ripple signal,
Even can constantly it be operated down in subsequent cycle, the average value system to this last triangular wave signal is zero.
When load instantaneous (load transient) changes, for example load 38 from light load be changing into heavy duty when, institute
The output current I neededOCan be more and more high, therefore have electric current and flow to load 38 through electric capacity 40 from ground terminal, therefore load voltage VOMeeting
Rapid drawdown, and then cause feedback voltage F rapid drawdowns.Because triangular wave signal A has positive and negative information simultaneously, and adder 46 can be by three
Angle ripple signal A is added with feedback voltage F, and to produce summation signal S, and comparison controller 32 can be less than target in summation signal S
During voltage T, it is separately turned on the first electronic switch 28 and closes the second electronic switch 30.In other words, in load transient, in load
Voltage VODrop it is too low before, summation signal S will be lower than target voltage T, comparison controller 32 is separately turned on the first electronics
The second electronic switch 30 of switch 28 and closing, makes load voltage VOKeep stable.Even if be supported on stable state, the present invention utilizes upper
Triangular wave signal is stated, also can steady load voltage VO。
In summary, the present invention using have simultaneously the triangular wave signal of positive and negative information as switch electronic switch according to
According to reaching the purpose of steady load voltage.
Symbol description：It is comparison controller 10, coboundary effect crystal 12, lower boundary field-effect transistor 14, inductor 16, negative
Carry 18, bleeder circuit 20, target voltage generator 22, capacitor 24, equivalent series resistance 26, the first electronic switch 28, second
Electronic switch 30, input voltage source 31, comparison controller 32, target voltage generator 34, inductance 36, load 38, electric capacity 40, point
Depressor 42, triangular wave generator 44, adder 46.
Claims (20)
1. a kind of voltage stabilizing control method, it is characterised in that comprise the steps of：
The upper load voltage of the load of partial pressure one, to produce a feedback voltage；
The feedback voltage and a periodic triangular ripple signal are received, and the triangular wave signal has positive voltage and negative voltage, and phase
Plus the feedback voltage and the triangular wave signal, to produce a summation signal；
Compare the summation signal and a target voltage, and when the summation signal is less than the target voltage, produces one and control signal；
And
The control signal is received, and is updated accordingly using an input voltage and stablizes the load voltage；
The production method of the triangular wave signal is comprised the steps of：
Receive a periodic trapezoidal-type waveform signal, each trapezoidal wave of the trapezoidal wave signal according to time order and function have an initial voltage,
One sample signal and a final voltage, the absolute value of the initial voltage are more than the absolute value of the final voltage；And
Captured the initial voltage in upper cycle and the average value of the final voltage, and this of next cycle is subtracted with the average value and take
Sample signal, to produce the triangular wave signal；Or
The production method of the triangular wave signal is comprised the steps of：
Receive a periodic trapezoidal-type waveform signal, each trapezoidal wave of the trapezoidal wave signal according to time order and function have an initial voltage,
One sample signal and a final voltage, the absolute value of the initial voltage are more than the absolute value of the final voltage；And
The average value of the final voltage in a upper cycle and the initial voltage in next cycle was captured, and is subtracted with the average value under this
The sample signal in one cycle, to produce the triangular wave signal.
2. voltage stabilizing control method as claimed in claim 1, it is characterised in that the average value of the triangular wave signal is zero.
3. voltage stabilizing control method as claimed in claim 1, it is characterised in that this controls signal to be high levle signal.
4. voltage stabilizing control method as claimed in claim 1, it is characterised in that each triangular wave of the triangular wave signal is initial
Voltage and final voltage are respectively crest voltage and valley point voltage.
5. voltage stabilizing control method as claimed in claim 1, it is characterised in that the load connects a divider, it is that partial pressure should
Load voltage, to produce the feedback voltage.
6. voltage stabilizing control method as claimed in claim 5, it is characterised in that the load connects one first electronic switch and one the
Two electronic switches, second electronic switch ground connection, first electronic switch receives the control signal, and according to control signal profit
Updated with the input voltage and stablize the load voltage.
7. voltage stabilizing control method as claimed in claim 6, it is characterised in that the load one electric capacity of parallel connection.
8. voltage stabilizing control method as claimed in claim 7, it is characterised in that second electronic switch connects a triangular wave and produced
Device, it is connected an adder with the divider, and the triangular wave generator receives the voltage drop across second electronic switch, with evidence
This produces the triangular wave signal to the adder, and the divider transmits the feedback voltage to the adder, and the adder is added should
Feedback voltage and the triangular wave signal, to produce the summation signal.
9. voltage stabilizing control method as claimed in claim 8, it is characterised in that the adder is connected with a target voltage generator
One comparison controller, the comparison controller connects first electronic switch and second electronic switch, and the comparison controller is received
The target voltage of the target voltage generator generation and the summation signal, by its relatively after, produce the control signal to this
One electronic switch, and drive second electronic switch.
10. voltage stabilizing control method as claimed in claim 9, it is characterised in that when first electronic switch is opens, this second
Electronic switch is closes, when first electronic switch is closes, and second electronic switch is to open.
11. a kind of voltage stabilizing control method, it is characterised in that comprise the steps of：
The upper load voltage of the load of partial pressure one, to produce a feedback voltage；
The feedback voltage and a periodic triangular ripple signal are received, and the triangular wave signal has positive voltage and negative voltage, and phase
Plus the feedback voltage and the triangular wave signal, to produce a summation signal；
Compare the summation signal and a target voltage, and when the summation signal is less than the target voltage, produces one and control signal；
And
The control signal is received, and is updated accordingly using an input voltage and stablizes the load voltage；
The production method of the triangular wave signal is comprised the steps of：
Receive one periodically the first trapezoidal wave signal with one periodicity the second trapezoidal wave signal, the first trapezoidal wave signal it is each
First trapezoidal wave has one first initial voltage, a sample signal and one first final voltage according to time order and function, the first initial electricity
The absolute value of pressure is more than the absolute value of first final voltage, and every one second trapezoidal wave of the second trapezoidal wave signal has one second
Initial voltage and one second final voltage, the absolute value of second initial voltage are less than the absolute value of second final voltage, and in phase
Only there is second trapezoidal wave between adjacent 2 first trapezoidal waves；And
In adjacent second trapezoidal wave of time order and function and first trapezoidal wave, second initial voltage and second end are captured
The average value of voltage, and the sample signal is subtracted with the average value, to produce the triangular wave signal.
12. voltage stabilizing control method as claimed in claim 11, it is characterised in that the average value of the triangular wave signal is zero.
13. voltage stabilizing control method as claimed in claim 11, it is characterised in that this controls signal to be high levle signal.
14. voltage stabilizing control method as claimed in claim 11, it is characterised in that at the beginning of each triangular wave of the triangular wave signal
Beginning voltage and final voltage are respectively crest voltage and valley point voltage.
15. voltage stabilizing control method as claimed in claim 11, it is characterised in that the load connects a divider, and it is partial pressure
The load voltage, to produce the feedback voltage.
16. voltage stabilizing control method as claimed in claim 15, it is characterised in that the load connects one first electronic switch and one
Second electronic switch, second electronic switch ground connection, first electronic switch receives the control signal, and according to the control signal
Updated using the input voltage and stablize the load voltage.
17. voltage stabilizing control method as claimed in claim 16, it is characterised in that the load one electric capacity of parallel connection.
18. voltage stabilizing control method as claimed in claim 17, it is characterised in that second electronic switch connects triangular wave production
Raw device, it is connected an adder with the divider, and the triangular wave generator receives the voltage drop across second electronic switch, with
The triangular wave signal is produced accordingly to the adder, and the divider transmits the feedback voltage to the adder, and the adder is added
The feedback voltage and the triangular wave signal, to produce the summation signal.
19. voltage stabilizing control method as claimed in claim 18, it is characterised in that the adder connects with a target voltage generator
A comparison controller is connect, the comparison controller connects first electronic switch and second electronic switch, the comparison controller connects
Receive the target voltage of the target voltage generator generation and the summation signal, by its relatively after, produce the control signal to should
First electronic switch, and drive second electronic switch.
20. voltage stabilizing control method as claimed in claim 19, it is characterised in that when first electronic switch is opens, this
Two electronic switches is close, when first electronic switch is closes, and second electronic switch is to open.
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| CN101728947A (en) * | 2008-10-29 | 2010-06-09 | 三美电机株式会社 | Dc-dc converter |
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| US7595624B2 (en) * | 2005-11-30 | 2009-09-29 | Texas Instruments Incorporated | Slope compensation for switching regulator |
| WO2009025517A2 (en) * | 2007-08-22 | 2009-02-26 | Silicon Mitus, Inc. | Power factor correction circuit |
| JP5211959B2 (en) * | 2008-09-12 | 2013-06-12 | 株式会社リコー | DC-DC converter |
| TWI410033B (en) * | 2010-04-06 | 2013-09-21 | Anpec Electronics Corp | Current mode buck converter with fixed pwm/pfm boundary |
| US8575911B2 (en) * | 2010-06-28 | 2013-11-05 | Virginia Tech Intellectual Properties, Inc. | Digital hybrid V2 control for buck converters |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101728947A (en) * | 2008-10-29 | 2010-06-09 | 三美电机株式会社 | Dc-dc converter |
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