CN102237791B - Adaptive slope compensation module and method - Google Patents
Adaptive slope compensation module and method Download PDFInfo
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Abstract
The invention provides an adaptive slope compensation method which is applied to a switched power supply unit. The switched power supply unit is provided with a power switch and an inductor which is coupled with an input power supply; and the power switch controls the inductor to store energies or release the energies so as to generate an output voltage. The adaptive slope compensation method comprises the following steps: detecting an inductive current flowing through the inductor and converting the inductive current into an inductive current detection voltage; detecting the duty cycle of the power switch; detecting the voltage difference of the inductive current detection voltage when the power switch is started; using the voltage difference of the duty cycle and the inductive current detection voltage to generate slope compensation signals; and utilizing the slope compensation signals to adjust the starting or the closing of the power switch. Therefore, although operation conditions of the input power supply or the output voltage are changed, the system can still respond quickly and does not generate sub-harmonic oscillation.
Description
Technical field
The present invention relevant for a kind of adaptability slope-compensation module with and method, more particularly, relevant for a kind of adaptability slope-compensation module that is applicable to switched power supply with and method.
Background technology
In general, the duty ratio of the power switch in the switched power supply (Duty cycle) was above 0.5 o'clock, subharmonic oscillation (sub-harmonic oscillation) may take place, be that switched power supplier may be with half frequency starting oscillation of switching frequency, the common mode that addresses this problem is to utilize slope-compensation (slope-compensation) mechanism.Yet, when general slope-compensation mode changes in the operating condition of the input power supply of switched power supply or output voltage, be easy to generate slope-compensation quantity not sufficient or too much phenomenon, and cause subharmonic oscillation still to exist or the problem that system responses is slack-off.
Summary of the invention
The invention provides a kind of adaptability slope compensation method.This adaptability slope compensation method is applicable to a switched power supply.This switched power supply has a power switch and an inductance is coupled to an input power supply.This power switch is controlled this inductance and is carried out energy storage or release energy, to produce an output voltage.This adaptability slope compensation method includes an inductive current that detects this inductance of flowing through, and be converted to an inductive current detect voltage, detect this power switch a duty ratio, detect this inductive current detect the voltage difference of voltage when this power switch is opened, according to this duty ratio this voltage difference with this inductive current detection voltage, producing this slope compensation, and adjust the opportunity that this power switch is opened or closed according to this slope compensation.
The present invention also provides a kind of adaptability slope-compensation module.This adaptability slope-compensation module is applicable to a switched power supply.This switched power supply has an ON-OFF control circuit, a power switch, an inductance and an inductive current detection circuit.This inductance is coupled to an input power supply.This inductive current detection circuit is in order to the detection electric current of this inductance of flowing through, and is converted to an inductive current and detects voltage.This ON-OFF control circuit control the unlatching of this power switch or close make this inductance carry out energy storage or release can, to produce an output voltage.This adaptability slope-compensation module includes a duty detection circuit, a voltage difference testing circuit and a slope-compensation rate integrating circuit.This duty detection circuit is in order to detect a duty ratio of this power switch.This voltage difference testing circuit detects the voltage difference of voltage in the opening time of this power switch in order to detect this inductive current.This slope-compensation rate integrating circuit compensates slope in order to according to this duty ratio, this voltage difference to calculate one, and this compensation slope of integration, to produce a slope compensation.
Description of drawings
Fig. 1 is the schematic diagram of explanation adaptability slope-compensation module 100 of the present invention.
The slope compensation that Fig. 2, Fig. 3 and Fig. 4 produce for explanation answering property slope-compensation module according to the present invention can make switched power supply that the schematic diagram of the operation principle of subharmonic oscillation does not take place to adjust the opportunity that power switch is opened or closed.
Fig. 5 is for the voltage difference of explanation slope-compensation rate integrating circuit of the present invention according to duty ratio, inductive current detection voltage, to calculate the schematic diagram of the operation principle that compensates slope.
The schematic diagram of the slope compensation that Fig. 6 produces according to the compensation slope for explanation slope-compensation rate integrating circuit.
Fig. 7 is the schematic diagram of an embodiment of explanation voltage difference testing circuit of the present invention.
Fig. 8 is the schematic diagram of an embodiment of duty detection circuit of the present invention.
Fig. 9 is the schematic diagram of an embodiment of slope-compensation rate integrating circuit of the present invention.
[main element label declaration]
| 1、2 | |
| 100 | Adaptability slope- |
| 110 | |
| 111、131 | |
| 120 | The voltage |
| 121 | The voltage |
| 122 | The voltage |
| 123 | |
| 130 | Slope-compensation |
| 132 | Voltage- |
| 133 | With door |
| 135 | |
| 136 | |
| 200 | Switched |
| 210 | ON- |
| 220 | Inductive |
| 1221、134 | One |
| 1222 | Logical circuit |
| C | Control end |
| C 1～C 3 | Electric capacity |
| D | Duty ratio |
| D 1 | Diode |
| i C | The inductive current peak control signal |
| i L | Inductive current |
| i LS | The small-signal disturbance quantity |
| I L0 | Expression inductive current initial value |
| L | Inductance |
| M 1 | The positive half cycle slope of inductive current |
| M 2 | Inductive current negative half period slope |
| M A | The compensation slope |
| Q PW | Power switch |
| R I | Detect resistance |
| S SC | Slope compensation |
| SW 1～SW 3 | Switch |
| T CS | Time difference |
| T S | Pulse width modulation period |
| V CS | Inductive current detects voltage |
| V CS_MAX | Inductive current detects the maximum of voltage |
| V CS_MIN | Inductive current detects the minimum value of voltage |
| V G | The power switch control signal |
| V IN | The input power supply |
| V OUT | Output voltage |
| V REC1 | Recording voltage |
| ΔV CS | Voltage difference |
Embodiment
Please refer to Fig. 1.Fig. 1 is the schematic diagram of explanation adaptability slope-compensation module 100 of the present invention.Adaptability slope-compensation module 100 is applicable to switched power supply 200.Switched power supply 200 operates in continuous conduction mode.Adaptability slope-compensation module 100 of the present invention is applicable to buck power supply unit, boost type power supply unit or step-down/up type power supply unit.For convenience of description, setting switched power supply 200 illustrates as an example for the boost type power supply unit.Switched power supply 200 has an ON-OFF control circuit 210, a power switch Q
PW, a diode D
1, an inductance L and an inductive current detection circuit 220.Inductance L is coupled to input power supply V
INON-OFF control circuit 210 control power switch Q
PWUnlatching or close so that inductance L carry out energy storage or release can, produce output voltage V
OUTInductive current detection circuit 220 detects the electric current of inductance L of flowing through, and is converted to inductive current detection voltage V
CSAdaptability slope-compensation module 100 includes a duty detection circuit 110, a voltage difference testing circuit 120 and a slope-compensation rate integrating circuit 130.Duty detection circuit 110 is in order to detection power switch Q
PWDuty ratio d.Voltage difference testing circuit 120 detects voltage V in order to detect inductive current
CSIn power switch Q
PWOpening time in a voltage difference Δ V
CSSlope-compensation rate integrating circuit 130 is in order to foundation duty ratio d, voltage difference Δ V
CS, to calculate a compensation slope M
A, and integral compensation slope M
A, to produce slope compensation S
SCON-OFF control circuit 210 is according to slope compensation S
SCAdjust power switch Q
PWThe opportunity of opening or closing.So, even the input power supply V of switched power supply 200
INOr output voltage V
OUTOperating condition change, switched power supply 200 still can respond and not take place subharmonic oscillation fast.Below its operation principle will be described further.
Please refer to Fig. 2, Fig. 3 and Fig. 4.The slope compensation S that Fig. 2, Fig. 3 and Fig. 4 produce for explanation adaptability slope-compensation module 100 according to the present invention
SCTo adjust power switch Q
PWOn the opportunity of opening or closing, can make switched power supply that the schematic diagram of the operation principle of subharmonic oscillation does not take place.Fig. 2 is the inductive current i of the inductance L of the switched power supply 200 of flowing through in the ideal
LSchematic diagram.I shown in Figure 2
L(t) expression inductive current waveform, I
L0Expression inductive current initial value, i
CExpression inductive current peak control signal, d are duty ratio, the T of power switch
SExpression power switch Q
PWPulse width modulation period (power switch Q just
PWOpportunity when opening again), M
1The positive half cycle slope of expression inductive current, M
2Expression inductive current negative half period slope, and M wherein
1And M
2Inductance L, input power supply V with switched power supply 200
INAnd output voltage V
OUTRelation, along with the difference of power supply unit 200 kinds, and different relational expressions is arranged, arrangement is as table one:
Among the present invention for convenience of description, with switched power supply 200 be the boost type power supply unit as an example.In Fig. 2, switched power supply 200 operates under the continuous conduction mode, when being in stable state, and inductive current initial value I
L0Can equal power switch Q
PWInductive current i when opening again
L(T
S).In other words, inductive current i
LIn time 0～T
SBetween variable quantity equal zero so the positive half cycle slope of inductive current M
1, inductive current negative half period slope M
2And the relation between the duty ratio d of power switch can be represented by following formula:
M
1·dT
S-M
2·(1-d)T
S＝0→M
2/M
1＝d/(1-d)...(1)；
When considering in fact inductive current i
LHas a small-signal disturbance quantity i
LSThe time, inductive current i shown in Figure 2
LCan become situation as shown in Figure 3.As seen from Figure 3, because inductive current i
LBe subjected to small-signal disturbance quantity i
LSInfluence, so inductive current i
LCan be in advance in time point (dT
S-T
CS) namely rise to peak value, and make ON-OFF control circuit 210 in time point (dT
S-T
CS) namely close power switch Q
PW, T wherein
CSThe expression time difference in advance.This moment inductive current i
LIn power switch Q
PWThe slope that rises during unlatching still equals M
1, therefore in time point (dT
S-T
CS) small-signal disturbance quantity i
LS(dT
S-T
CS) equal the small-signal disturbance quantity i of time point 0
LS(0).As seen from Figure 3, time point (dT
S-T
CS) small-signal disturbance quantity i
LS(dT
S-T
CS) can be expressed as (M
1* T
CS).In other words, the small-signal disturbance quantity i of time point 0
LS(0) can represent by following formula:
i
LS(0)＝M
1×T
CS...(2)；
In like manner, when considering inductive current i
LHas small-signal disturbance quantity i
LSThe time, inductive current i
LIn power switch Q
PWThe slope that descends when closing still equals M
2, therefore in time point (dT
S) small-signal disturbance quantity i
LS(dT
S) equal time point T
SSmall-signal disturbance quantity i
LS(T
S).As seen from Figure 3, time point (dT
S) small-signal disturbance quantity i
LS(dT
S) can be expressed as (M
2* T
CS).In other words, time point T
SSmall-signal disturbance quantity i
LS(T
S) can represent by following formula:
i
LS(T
S)＝M
2×T
CS＝i
LS(0)×(M
2/M
1)...(3)；
So, can learn according to formula (1) and formula (3), in time (N * T
S) time small-signal disturbance quantity i
LS(NT
S) can represent by following formula:
i
LS(NT
S)＝i
LS(0)×[d/(1-d)]
N...(4)；
Therefore, by formula (4) as can be known, when the absolute value of [d/ (1-d)] less than 1 the time, small-signal disturbance quantity i
LS(NT
S) just can restrain.That is to say power switch Q
PWDuty ratio need less than 0.5, switched power supply 200 just can not produce subharmonic oscillation.Please refer to Fig. 4, Fig. 4 is for making the inductive current i of the switched power supply 100 after the slope-compensation by adaptability slope-compensation module 100 of the present invention
LOscillogram.In Fig. 4, by slope-compensation mechanism, in inductive current peak control signal i
CEquivalence adds a negative slope M
ACompensation, then similar aforesaid analysis, the small-signal disturbance quantity i of time point 0
LS(0) can represent by following formula:
i
LS(0)＝(M
1+M
A)×T
CS...(5)；
And inductive current i
LIn power switch Q
PWThe slope that descends when closing still equals M
2, therefore via similar analysis as seen from Figure 4, time point T
SSmall-signal disturbance quantity i
LS(T
S) can represent by following formula:
i
LS(T
S)＝(M
2-M
A)×T
CS...(6)；
So, can be learnt by formula (5) and formula (6), consider that adaptability slope-compensation module 100 of the present invention is done slope-compensation after, in time point (N * T
S) time small-signal disturbance quantity i
LS(NT
S) can represent by following formula:
i
LS(NT
S)＝i
LS(0)×{(1-M
A/M
2)/[(1-d)/d+M
A/M
2]}
N...(7)；
Therefore, by formula (7) as can be known, as long as the compensation slope M that the slope-compensation rate integrating circuit 130 of adaptability slope-compensation module 100 of the present invention produces
ABe taken at 1/2 * M
2≤ M
A≤ M
2Scope in (for example, get compensation slope M
ABe 2/3 * M
2), can avoid switched power supply in power switch Q
PWDuty ratio d greater than 0.5 o'clock, produce the phenomenon of subharmonic oscillation.
In sum, the compensation slope M of adaptability slope-compensation module 100 of the present invention
ACan be by inductive current negative half period slope M
2(or the positive half cycle slope of inductive current M
1) decide.In addition, as shown in Table 1, M
1With M
2Must be converted to import power supply V
IN, output voltage V
OUTAnd the represented relational expression of inductance L.In other words, under the known situation of inductance L, adaptability slope-compensation module 100 of the present invention is as long as detect input power supply V
INOr output voltage V
OUTVariation or can react the signal of its variation, just can calculate compensation slope M
ASo, adaptability slope-compensation module 100 of the present invention can be according to above-mentioned compensation slope M
A, to produce suitable slope-compensation amount (slope compensation S
C).Therefore, even the input power supply V of switched power supply 200
INOr output voltage V
OUTOperating condition change the slope compensation S that ON-OFF control circuit 210 still can adaptability slope-compensation module 100 according to the present invention provides
SC, suitably to adjust power switch Q
PWOpportunity of open and close, keep the response speed of switched power supply 200, and avoid switched power supply 200 to produce the phenomenon of subharmonic oscillations.
Please refer to Fig. 5.Fig. 5 is for illustrating that slope-compensation rate integrating circuit of the present invention is according to duty ratio d, voltage difference Δ V
CS, to calculate compensation slope M
AThe schematic diagram of operation principle.V in Fig. 5
CSExpression inductive current detection circuit 220 is in power switch Q
PWThe ratio that produces during unlatching is in inductive current i
LInductive current detect voltage V
CSBe example with Fig. 1, as power switch Q
PWDuring unlatching, inductive current i
LThe resistance R of flowing through
IDetect voltage V to produce inductive current
CSTherefore inductive current detects voltage V
CS=i
L* R
IAnd i
LIn power switch Q
PWThe slope that rises during unlatching is M
1, so inductive current detects voltage V
CSIn power switch Q
PWThe slope that rises during unlatching equals (M
1* R
I).As seen from Figure 5, detect inductive current according to voltage difference testing circuit 120 and detect voltage V
CSIn power switch Q
PWOpening time in voltage difference Δ V
CSWith the duty detection circuit 110 power switch Q that obtains that detects
PWDuty ratio d, namely can calculate the positive half cycle slope of inductive current M by following formula
1:
M
1＝ΔV
CS/(d×T
S×R
I)...(8)；
So, can further obtain according to formula (1):
M
2＝ΔV
CS/[(1-d)×T
S×R
I]...(9)；
Therefore, in the present invention, because slope-compensation rate integrating circuit 130 is according to duty ratio d, power switch Q
PWPulse width modulation period T
S, and voltage difference Δ V
CS, to calculate inductive current negative half period slope M
2, and set suitable compensation slope M according to this
AEven therefore import power supply V
INOr output voltage V
OUTOperating condition change, slope-compensation rate integrating circuit 130 still can be according to duty ratio d and voltage difference Δ V
CSVariation, and calculate inductive current negative half period slope M under present operating condition
2In other words, slope-compensation rate integrating circuit 130 can be along with the change of operating condition, to set suitable compensation slope M
AFor example, compensation slope M
ACan be set at 2/3 * M
2, so that M
AAt 1/2 * M
2≤ M
A≤ M
2Scope in.Slope-compensation rate integrating circuit 130 further integral compensation slope M of the present invention
A, to produce slope compensation S
SC, as shown in Figure 6.So, ON-OFF control circuit 210 is according to slope compensation S
SCAdjustable power switch Q
PWThe opportunity of opening or closing.In one embodiment, ON-OFF control circuit 210 is according to slope compensation S
SCDetermine inductive current i
LA limit value i
LIM(compensation inductive current peak control signal (i later
C-S
SC)), and compare inductive current i
LWith limit value i
LIM, as inductive current i
LRise to and equal limit value i
LIMThe time, produce a comparison signal S
CMP, make ON-OFF control circuit 210 close power switch Q
PWIn another embodiment, ON-OFF control circuit 210 also can detect voltage V according to inductive current
CS, a charge threshold level V
THWith slope compensation S
SCClose power switch Q
PW, wherein inductive current detects voltage V
CSEqual (i
L* R
I), critical voltage is set at (i
C* R
I), and for convenience, this moment slope compensation S
SCBe basis (M
A* R
I) time integral is got.When inductive current detects voltage V
CSAdd slope compensation S
SCEqual critical voltage V
THThe time, ON-OFF control circuit 210 is closed power switch Q
PWEven above any control mode no matter is input power supply V
INOr output voltage V
OUTOperating condition change, switched power supply still can respond and not take place subharmonic oscillation fast.
Please refer to Fig. 7.Fig. 7 is the schematic diagram of an embodiment of explanation voltage difference testing circuit 120 of the present invention.Voltage difference testing circuit 120 includes a voltage max sample circuit 121, a voltage minimum sample circuit 122, and a subtracter 123.Voltage max sample circuit 121 is used to power switch Q
PWDetect inductive current during unlatching and detect voltage V
CS, detect voltage V with the record inductive current
CSMaximum V
CS_MAXThe structure of voltage max sample circuit 121 and operation principle are the known technology of industry, only are being a kind of embodiment wherein and non-limiting category of the present invention shown in Fig. 7.In Fig. 7, voltage max sample circuit 121 comprises a switch SW
1, and a capacitor C
1Capacitor C
1In order to record a recording voltage V
REC1Switch SW
1Control end C be used for received power switch controlling signal V
G, power switch control signal V wherein
GBe used for controlling power switch Q simultaneously
PWOpen or close.Work as switch SW
1During unlatching, inductive current detects voltage V
CSTo capacitor C
1Switch SW is worked as in charging
1Before closing again, capacitor C
1The voltage VREC1 that records is outputting inductance current detection voltage V
CSMaximum V
CS_MAXThe structure of voltage minimum sample circuit 122 and operation principle also are the known technology of industry.Only be a kind of embodiment wherein at the voltage minimum sample circuit 122 shown in Fig. 7.Voltage minimum sample circuit 122 in Fig. 7 comprises a switch SW
2, a capacitor C
2, an one shots 1221 and a logical circuit (as AND gate) 1222.As power switch control signal V
GDuring for logic high, trigger one shots 1221 in one time of delay T
DELAYAfter, export the delayed pulse signal S of a logic high
DELAY Logical circuit 1222 is in pulse signal S
DELAYBurst length in, go back to logic low after exporting a logic-high signal, make switch SW
2Open a bit of time namely closes at once.Capacitor C
2Can be recorded in switch SW
2Inductive current during unlatching detects voltage V
CSIn other words, voltage minimum sample circuit 122 is in power switch Q
PWDuring unlatching, through one time of delay T
DELAYAfter, the inductive current that records this time point detects voltage V
CSDetect voltage V as inductive current
CSMinimum value V
CS_MIN, wherein time of delay T
DELAYMainly be to avoid because of power switch Q
PWInductive current detects voltage V when opening moment
CSRing (ringing), cause capacitor C
2Be recorded to incorrect voltage.So, voltage difference testing circuit 120 can detect voltage V with inductive current by subtracter 123
CSMaximum V
CS_MAXDetect voltage V with inductive current
CSMinimum value V
CS_MINSubtract each other, with outputting inductance current detection voltage V
CSIn power switch Q
PWOpening time in voltage difference Δ V
CS
Please refer to Fig. 8.Fig. 8 is the schematic diagram of an embodiment of duty detection circuit 110 of the present invention.Duty detection circuit 110 shown in Figure 8 detects input power supply V
INWith output voltage V
OUT, to calculate power switch Q
PWDuty ratio d.Duty detection circuit 110 shown in Figure 8 comprises a division circuit 111, is used for calculating input power supply V
INWith output voltage V
OUTRatio, to obtain power switch Q
PWDuty ratio d.Except duty detection circuit shown in Figure 8 110, but also have many detection power switch Q
PWThe method of duty ratio d.For example, as power switch Q
PWOperator scheme be set at and have a fixing known pulse width modulation period T
SPREThe time, duty detection circuit 110 can first detection power switch Q
PWOpening time T
ON, and according to power switch Q
PWKnown pulse width modulation period T
SPREWith power switch Q
PWOpening time T
ON, to calculate power switch Q
PWDuty ratio d.Because at different power switch Q
PWOperator scheme, but industry all has known circuit detection power switch Q
PWDuty ratio d, so do not repeat them here.
Please refer to Fig. 9.Fig. 9 is the schematic diagram of an embodiment of slope-compensation rate integrating circuit 130 of the present invention.In Fig. 9, slope-compensation rate integrating circuit 130 comprises a division circuit 131, a voltage-current converter circuit 132, a capacitor C
3, a switch SW
3, one and door (AND gate) 133, one one shots 134, a subtraction circuit 135 and a mlultiplying circuit 136.Mlultiplying circuit 136 is with duty ratio d and power switch Q
PWPulse width modulation period T
SMultiply each other, to obtain power switch Q
PWSwitch conduction cycle (d * T
S).Subtraction circuit 135 is used for according to power switch Q
PWSwitch conduction cycle (d * T
S) and pulse width modulation period T
S, to calculate power switch Q
PWSwitch off period [(1-d) * T
S].That is to say that slope-compensation rate integrating circuit 130 can calculate power switch Q according to duty ratio d
PWSwitch off period [(1-d) * T
S].Division circuit 131 be used for according to switch off period [(1-d) * T
S] and voltage difference Δ V
CS, to calculate compensation slope M
AVoltage-current converter circuit 132 and capacitor C
3Form an integrating circuit, be used for integral compensation slope M
A, to produce slope compensation S
SCIn addition, one shots 134 be used for control switch SW with door 133
3In power switch Q
PWDuring unlatching, replacement slope compensation S
SC, the voltage minimum sample circuit 122 shown in the similar Fig. 7 of its operation principle.
In sum, in adaptability slope-compensation module provided by the present invention, can detect inductive current by the voltage difference testing circuit and detect the voltage difference of voltage when power switch is opened, but and pass through the duty ratio of duty detection circuit detection power switch.So, adaptability slope-compensation module of the present invention can calculate the rate of rise or the descending slope of inductive current, and be compensated slope according to this according to the duty ratio of power switch and the voltage difference of inductive current detection voltage.Because the rate of rise of inductive current and the input power supply that descending slope can reflect switched power supply or the variation of output voltage.Therefore, adaptability slope-compensation module of the present invention can produce suitable slope-compensation amount (slope compensation) according to the rate of rise or the resulting compensation slope of descending slope of inductive current.So, even the operating condition of the input power supply of switched power supply or output voltage changes, the slope compensation that the ON-OFF control circuit of switched power supply still can adaptability slope-compensation module according to the present invention provides, with the opportunity of the open and close of suitably adjusting power switch, keep the response speed of switched power supply, and avoid switched power supply to produce the phenomenon of subharmonic oscillation, bring the user bigger convenience.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim scope of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (7)
1. adaptability slope compensation method, be applicable to a switched power supply, this switched power supply has a power switch and an inductance is coupled to an input power supply, this power switch is controlled this inductance and is carried out energy storage or release energy, to produce an output voltage, this adaptability slope compensation method includes:
The detection inductive current of this inductance of flowing through, and be converted to an inductive current and detect voltage;
Detect a duty ratio of this power switch;
Detect this inductive current and detect the voltage difference of voltage when this power switch is opened;
According to this voltage difference of this duty ratio and this inductive current detection voltage, to produce slope compensation; And
Adjust the opportunity that this power switch is opened or closed according to this slope compensation,
Wherein, detecting the method that this inductive current detects this voltage difference of voltage comprises:
Be detected on maximum and the minimum value of this inductive current detection voltage in this power switch opening time; And
Maximum and minimum value according to this inductive current detection voltage determine this voltage difference.
2. adaptability slope compensation method according to claim 1, this duty ratio that wherein detects this power switch includes:
Detect this input power supply and this output voltage, to calculate this duty ratio of this power switch.
3. adaptability slope compensation method according to claim 1, this duty ratio that wherein detects this power switch includes:
Detect an opening time of this power switch; And
According to a known pulse width modulation period and this opening time of this power switch, to calculate this duty ratio of this power switch.
4. adaptability slope compensation method according to claim 1 wherein detects this voltage difference of voltage according to this duty ratio and this inductive current, include to produce this slope compensation:
Calculate a switch off period according to this duty ratio; And
Detect this voltage difference and this switch off period of voltage according to this inductive current, produce this slope compensation with integral way.
5. adaptability slope compensation method according to claim 1, wherein detect the method that this inductive current detects this voltage difference of voltage and comprise:
After this power switch is opened, through a time of delay, detect and record this inductive current and detect voltage as this minimum value.
6. adaptability slope compensation method according to claim 1, wherein adjust the method on the opportunity that this power switch opens or close according to this slope compensation and include:
Determine a limit value of this inductive current according to this slope compensation;
Relatively this inductive current and this limit value, and produce a comparison signal; And
Adjust the opportunity that this power switch is opened or closed according to this comparison signal.
7. adaptability slope-compensation module, be applicable to a switched power supply, this switched power supply has an ON-OFF control circuit, a power switch, an inductance and is coupled to an input power supply, an inductive current detection circuit, in order to the flow through electric current of this inductance of detection, and be converted to an inductive current and detect voltage, this ON-OFF control circuit control the unlatching of this power switch or close make this inductance carry out energy storage or release can, to produce an output voltage, this adaptability slope-compensation module includes:
One duty detection circuit is in order to detect a duty ratio of this power switch;
One voltage difference testing circuit detects the voltage difference of voltage in the opening time of this power switch in order to detect this inductive current; And
One slope-compensation rate integrating circuit in order to according to this duty ratio, this voltage difference, compensates slope to calculate one, and this compensation slope of integration, offers this ON-OFF control circuit to produce a slope compensation;
Wherein, this voltage difference testing circuit includes:
One voltage max sample circuit is used to detect in this power switch opening time this inductive current and detects voltage, to record the maximum that this inductive current detects voltage; And
One voltage minimum sample circuit is used to detect in this power switch opening time this inductive current and detects voltage, to record the minimum value that this inductive current detects voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010167985 CN102237791B (en) | 2010-04-22 | 2010-04-22 | Adaptive slope compensation module and method |
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| KR101234669B1 (en) * | 2011-12-08 | 2013-02-19 | 현대자동차주식회사 | Method for current correction of dc-dc converter a green car |
| CN103294087B (en) * | 2012-03-02 | 2015-01-14 | 株式会社理光 | Periodical analog voltage signal generating circuit |
| US9667156B2 (en) * | 2015-03-06 | 2017-05-30 | Fairchild Semiconductor Corporation | Power supply with line compensation circuit |
| CN104953829B (en) * | 2015-05-21 | 2018-05-04 | 西南交通大学 | A kind of certainly frequency peak current control method applied to BUCK converters |
| CN105897201B (en) * | 2016-03-31 | 2019-01-25 | 宜确半导体（苏州）有限公司 | A kind of GSM radio-frequency power amplifier |
| CN106487205B (en) * | 2016-09-23 | 2019-01-29 | 矽力杰半导体技术(杭州)有限公司 | Parameter identification circuit, method and the power-supply system using it |
| CN108736716B (en) * | 2018-06-22 | 2023-11-28 | 武汉理工大学 | Digital current-imitating controller of DC/DC converter and control method thereof |
| US11722061B2 (en) * | 2021-05-07 | 2023-08-08 | Texas Instruments Incorporated | Valley current mode control for a voltage converter |
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| CN101677208A (en) * | 2008-09-17 | 2010-03-24 | 原景科技股份有限公司 | DC/DC converter and slope compensation circuit thereof |
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| CN101677208A (en) * | 2008-09-17 | 2010-03-24 | 原景科技股份有限公司 | DC/DC converter and slope compensation circuit thereof |
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