CN103199703A - Control circuit of voltage-type regulator and control method of same - Google Patents
Control circuit of voltage-type regulator and control method of same Download PDFInfo
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- CN103199703A CN103199703A CN2013101157072A CN201310115707A CN103199703A CN 103199703 A CN103199703 A CN 103199703A CN 2013101157072 A CN2013101157072 A CN 2013101157072A CN 201310115707 A CN201310115707 A CN 201310115707A CN 103199703 A CN103199703 A CN 103199703A
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Abstract
The invention relates to a control circuit of a voltage-type regulator and a control method of the same. According to the control method of the voltage-type regulator, feedback signals of represented output voltage and ripple wave signals which are the same with a duty ratio in phase position are overlaid mutually, so that first voltage signals are generated; through comparison between the first voltage signals and an upper limit reference voltage and comparison between the first voltage signals and a lower limit reference voltage, corresponding comparison signals are generated; under a first working condition, an on-off state of a main power switch tube of the voltage-type regulator is controlled by constant time signals; and under a second working condition, theon-off state of the main power switch tube is controlled by the comparison signals.
Description
Technical field
The present invention relates to field of switch power, in particular, relate to a kind of control circuit and control method thereof of voltage-type adjuster of constant time control model of can self adaptation regulating.
Background technology
Voltage regulator, for example the DC-to-DC electric pressure converter provides stable voltage source in order to give dissimilar electronic equipments.Battery management for some lower powered equipment (for example portable computer, Portable mobile phone etc.) especially needs high efficiency DC-to-DC converter.Switching voltage type adjuster converts input voltage to a high-frequency voltage signal, then this high frequency input voltage signal is carried out filtering and handles to produce a direct current output voltage.The voltage-type adjuster generally includes a switch, an input dc power potential source (as battery) alternately is coupled and decoupling zero to load (as integrated circuit); An output filter generally includes an inductance and an electric capacity, and it is connected between input voltage source and the load, handles in order to the output of switch is carried out filtering, and then a direct current output voltage is provided; A control device (for example pulse width regulator (PWM), frequency pulse adjuster etc.) in order to control switch to obtain a constant relatively VD.
In the prior art, the voltage-type adjuster can adopt multiple control modes, for example voltage mode control or current control mode or constant time control model.With reference to figure 1, be depicted as the theory diagram of control circuit that adopt prior art a kind of adopts the voltage-type adjuster of constant ON time control model.In this implementation, output voltage V
OutThrough divider resistance R
Fb1And resistance R
Fb2After carrying out dividing potential drop, obtain feedback signal V
FBThe inverting input receiving feedback signals V of comparator 101
FB, in-phase input end receives reference voltage V
Ref, the output of comparator 101 is connected to an input with door 103.Receive the output signal of minimum turn-off time generating circuit 102 with another input of door 103.The set end S of rest-set flip-flop 105 receives the output signal with door 103, reset terminal receives the output signal of constant ON time generation circuit 104, the output signal of output Q inputs to logic and driver circuitry 106, drives master power switch pipe Q1 and synchronizing power switching tube Q2 respectively to produce corresponding driving signal.
Its detailed operation process is as follows: as feedback signal V
FBDrop to reference voltage V
RefThe time, the output signal of comparator 101 is high level, if the output signal of minimum turn-off time generating circuit 102 is similarly high level, then the output signal with door 103 is high level, and with set rest-set flip-flop 105, the output signal of output Q is high level.By logic and driver circuitry 106, with master power switch pipe Q1 conducting, and with synchronizing power switching tube Q2 shutoff, thereby feedback signal V
FBBegin to rise.After the conducting state duration of master power switch pipe Q1 arrived the constant time that 104 timing of constant ON time generation circuit produce, master power switch pipe Q1 was turned off, then this moment feedback signal V
FBBegin to descend, until dropping to reference voltage V again
RefGo round and begin again, by this constant ON time control model, the control output voltage V
OutKeep substantially constant.
But, adopt this control mode, work as output voltage V
OutWith input voltage V
InVery approaching, perhaps during approximately equal, wish that the conducting duty ratio of master power switch pipe Q1 can namely be in full-gear close to 1 this moment.But because length and the existence of minimum turn-off time of the constant time that constant ON time generation circuit 104 produces make that the conducting duty ratio of master power switch pipe Q1 can't be as far as possible close to 1.Therefore, when this situation, system can't operate as normal, can't obtain stable output voltage.On the other hand, when the output loading generation saltus step of voltage-type adjuster, because the existence of constant ON time makes very slow to the transient response speed of load.For example, when output loading increased suddenly, this moment, sudden change from low to high took place in output current, because constant ON time is fixed, therefore, control circuit can't in time turn-off the master power switch pipe, causes transient response speed very slow.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of control circuit and control method thereof of novel voltage-type adjuster, slow to solve in the prior art transient response speed, and problems such as input voltage and the approximately equalised job stability of output voltage.
Control method according to a kind of voltage-type adjuster of the present invention in order to control the state of a voltage-type adjuster, produces a constant output voltage with the output at described voltage-type adjuster, may further comprise the steps:
The described output voltage of sampling is to produce the feedback signal that characterizes described output voltage;
According to the duty ratio of the master power switch pipe of described voltage-type adjuster, generate one with the synchronous ripple signal of described duty ratio;
Described feedback signal and described ripple signal are superposeed, to produce first voltage signal;
Input voltage and described output voltage according to described voltage-type adjuster produce a constant time signal;
Described first voltage signal is compared with a upper limit reference voltage and a lower limit reference voltage respectively, to produce corresponding comparison signal;
When first operating state, described constant time signal is controlled the on off state of the master power switch pipe of described voltage-type adjuster;
When second operating state, described comparison signal is controlled the on off state of described master power switch pipe.
Further, the generation step of described ripple signal comprises:
The sample node voltage of described voltage-type adjuster;
Described node voltage is carried out filtering, to obtain first filtering voltage;
Described first filtering voltage is carried out filtering, to obtain second filtering voltage;
Described first filtering voltage and described second filtering voltage are carried out the difference computing, to obtain a difference voltage;
Described difference voltage and a proportionality coefficient are multiplied each other, to obtain described ripple signal.
Further, the control step of described master power switch pipe comprises:
In each switch periods, when described first voltage signal during less than described lower limit reference voltage, the described master power switch pipe of conducting;
When first operating state, when the ON time of described master power switch pipe arrives a constant ON time of described constant time signal sign, turn-off described master power switch pipe;
When second operating state, according to the comparative result of described first voltage signal and described upper limit reference voltage, when described first voltage signal rises to described upper limit reference voltage, turn-off described master power switch pipe.
Preferably, the ratio relation in direct ratio of described constant ON time and described output voltage and described input voltage.
Further, the control step of described master power switch pipe comprises:
In each switch periods, when described first voltage signal during greater than described upper limit reference voltage, turn-off described master power switch pipe;
When first operating state, during constant turn-off time of arriving that described constant time signal characterizes when the turn-off time of described master power switch pipe, the described master power switch pipe of conducting;
When second operating state, according to the comparative result of described first voltage signal and described lower limit reference voltage, when described first voltage signal drops to described lower limit reference voltage, the described master power switch pipe of conducting.
Preferably, the ratio relation in direct ratio of the difference between described constant turn-off time and described input voltage and the described output voltage and described input voltage.
Control circuit according to a kind of voltage-type adjuster of the present invention in order to control a voltage-type adjuster, produces a constant output voltage with the output at described voltage-type adjuster, comprise first control circuit, constant time generating circuit, second control circuit, wherein
First voltage signal and first reference voltage of described first control circuit in order to relatively to receive produces first control signal;
The duty ratio same-phase of the master power switch pipe in described first voltage signal and the described voltage-type adjuster;
Described constant time generating circuit produces a constant time signal in order to the input voltage according to described output voltage and described voltage-type adjuster;
Described first voltage signal and second reference voltage of described second control circuit in order to relatively to receive produces second control signal;
When first operating state, described constant time signal and described second control signal are controlled the on off state of the master power switch pipe of described voltage-type adjuster;
When second operating state, described first control signal and described second control signal are controlled the on off state of described master power switch pipe.
Further, also comprise the ripple signal generating circuit, described ripple signal generating circuit receives the node voltage of described voltage-type adjuster, to produce described ripple signal according to this; Described ripple signal and the feedback signal stack that characterizes described output voltage are to produce described first voltage signal.
Further, also comprise a logical circuit, described logical circuit receives described first control signal, and described constant time signal and described second control signal are controlled the on off state of described master power switch pipe to produce control signal.
Preferably, in each switch periods, when described first voltage signal during less than described second reference voltage, the described master power switch pipe of beginning conducting.
Preferably, when first operating state, the ON time that described constant time signal is controlled described master power switch pipe is a steady state value, the ratio relation in direct ratio of described ON time and described output voltage and described input voltage; Through after the described ON time, turn-off described master power switch pipe.
Preferably, when second operating state, when described first voltage signal rises to described first reference voltage, turn-off described master power switch pipe.
Preferably, in each switch periods, when described first voltage signal during greater than described second reference voltage, begin to turn-off described master power switch pipe.
Preferably, when first operating state, the turn-off time that described constant time signal is controlled described master power switch pipe is a steady state value, the ratio relation in direct ratio of the difference between described turn-off time and described input voltage and the described output voltage and described input voltage; Through after the described turn-off time, the described master power switch pipe of conducting.
Preferably, when second operating state, when described first voltage signal drops to described first reference voltage, the described master power switch pipe of conducting.
According to control circuit and the control method thereof of the voltage-type adjuster of the embodiment of the invention, at the duty ratio synchronous ripple signal of the feedback signal stack one that characterizes output voltage with the master power switch pipe.By and upper limit reference voltage and the relation of the numerical values recited between the lower limit reference voltage value set, an and constant temporal information relevant with input voltage and output voltage, when normal operating conditions, control master power switch pipe is with constant temporal mode work, and the operating frequency of keeping the voltage-type adjuster is for fixing; And when the abnormal work state, when for example output voltage is close to input voltage, system is no longer with constant temporal mode work, but determined by the upper limit reference voltage of setting or the magnitude relationship between the lower limit reference voltage value, thereby reduced the operating frequency of voltage-type adjuster, the system that makes still can keep constant output voltage in such cases.
Description of drawings
Figure 1 shows that adopt prior art a kind of adopts the theory diagram of control circuit of the voltage-type adjuster of constant ON time control model;
Figure 2 shows that the theory diagram according to the control circuit of the voltage-type adjuster of first embodiment of the invention;
Fig. 3 A is depicted as the theory diagram according to the ripple signal generating circuit of one embodiment of the invention;
Fig. 3 B is depicted as the working waveform figure of the ripple signal generating circuit shown in Fig. 3 A;
Fig. 4 A is depicted as the theory diagram according to the control circuit of the voltage-type adjuster of second embodiment of the invention;
Fig. 4 B is depicted as the working waveform figure of control circuit when first operating state of the voltage-type adjuster shown in Fig. 4 A;
Fig. 4 C is depicted as the working waveform figure of control circuit when second operating state of the voltage-type adjuster shown in Fig. 4 A;
Figure 5 shows that the workflow diagram according to the control method of the voltage-type adjuster of one embodiment of the invention;
Figure 6 shows that according to the production method flow chart of a kind of acquisition of the present invention with the synchronous ripple signal of master power switch pipe duty ratio.
Embodiment
Below in conjunction with accompanying drawing several preferred embodiments of the present invention is described in detail, but the present invention is not restricted to these embodiment.The present invention is contained any in substituting of making of marrow of the present invention and scope, modification, equivalent method and scheme.Understand for the public is had completely the present invention, in the following preferred embodiment of the present invention, describe concrete details in detail, and do not have the description of these details also can understand the present invention fully for a person skilled in the art.
With reference to figure 2, be depicted as the theory diagram according to the control circuit of the voltage-type adjuster of first embodiment of the invention.In this embodiment, master power switch pipe Q1, synchronizing power switching tube Q2, inductance L
0And capacitor C
0Form a voltage-dropping type power stage circuit.
The first voltage signal V of first control circuit 201 in order to relatively to receive
TriaWith first reference voltage V
Ref1, produce the first control signal S1.
The first voltage signal V
TriaBy feedback signal V
FBWith a ripple signal V
RippleStack produces; Here, ripple signal V
RippleDuty ratio same-phase with master power switch pipe Q1 in the voltage-type adjuster.
The input voltage V that constant time generating circuit 202 receives in order to basis
In, output voltage V
OutAnd control signal S
CtrlProduce a constant time signal S
T
The first voltage signal V of second control circuit 203 in order to relatively to receive
TriaWith second reference voltage V
Ref2, to produce the second control signal S2.
When first operating state, when namely the voltage-type adjuster was in normal operating conditions, logical circuit 204 was according to constant time signal S
TControl the on off state of master power switch pipe Q1 with the second control signal S2.The voltage-type adjuster is with constant temporal mode work, and operating frequency is kept constant.
When second operating state, namely the output voltage of voltage-type adjuster and input voltage very near the time, logical circuit 204 is controlled the on off state of master power switch pipe Q1 according to the first control signal S1 and the second control signal S2.The voltage-type adjuster is no longer with constant temporal mode work, and operating frequency is reduced, and to guarantee voltage-type adjuster operate as normal this moment, output voltage is kept constant.
Here, ripple signal V
RippleCan obtain by multiple different implementation.Fig. 3 has enumerated a kind of specific embodiment.With reference to figure 3A, ripple signal generating circuit 300 comprises first filter circuit of being made up of resistance R 1 and capacitor C 1 that is connected in series and second filter circuit of being made up of resistance R 2 and capacitor C 2.First filter circuit and second filter circuit are the filter circuit with higher time constant.Concrete, first filter circuit receives the node voltage V of voltage-type adjuster
LX, because master power switch pipe Q1 and synchronizing power switching tube Q2 alternate conduction, therefore, node voltage V
LXIt is a square wave voltage signal.Node voltage V
LXAfter carrying out filtering through first filter circuit, generate the first average voltage V of 13 jiao of waveform shape at the points of common connection place of resistance R 1 and capacitor C 1
Ave1Then, the first average voltage V
Ave1Carry out filtering through second filter circuit again, generate the second average voltage V of 13 jiao of waveform shape at the points of common connection place of resistance R 2 and capacitor C 2
Ave2, shown in Fig. 3 B.The second average voltage V
Ave2Peak-to-peak value less than the first average voltage V
Ave1With the first average voltage V
Ave1With the second average voltage V
Ave2Carry out subtraction, and carry out certain scale operation, thereby obtain ripple signal V
Ripple
Ripple signal V according to the embodiment of the invention
RippleWith the duty ratio same-phase of master power switch pipe Q1 in the voltage-type adjuster, and do not have DC component, when the conducting of master power switch pipe, have the rate of rise, when the conducting of synchronizing power switching tube, have descending slope.
Below in conjunction with specific embodiment, detailed description is according to the specific implementation of each circuit structure of the control circuit of voltage-type adjuster of the present invention.
With reference to figure 4A, be depicted as the theory diagram according to the control circuit of the voltage-type adjuster of second embodiment of the invention.
In this embodiment, first control circuit comprises comparator 402, and its in-phase input end receives ripple signal V
RippleWith feedback signal V
FBThe first voltage signal V that is formed by stacking
Tria, inverting input receives upper limit reference voltage V
REF_H(first reference voltage).
Constant time generating circuit comprises ramp signal generation circuit 406, comparator 403 and holding circuit 407.Inverting input reception one and the output voltage V of comparator 403
OutThe reference voltage V of proportional relation
REF1, in-phase input end receives the ramp signal V of ramp signal generation circuit 406 outputs
RampThe output signal of comparator 403 is through holding circuit 407 maintenance of sampling.A kind of specific implementation of ramp signal generation circuit 406 is as follows: current source I
CHG, charging capacitor C
CHGWith gate-controlled switch Q
TBe connected in parallel each other between the in-phase input end and ground of comparator 403.Wherein, current source I
CHGElectric current and input voltage V
InRelation in direct ratio, gate-controlled switch Q
TOn off state opposite with the on off state of master power switch pipe Q1.
Second control circuit comprises comparator 401, and its in-phase input end receives the lower limit reference voltage V
REF_L(second reference voltage), inverting input receive the first voltage signal V
Tria
Logical circuit comprises and door 404 and rest-set flip-flop 405.Receive the first control signal S1 and constant time signal S respectively with two inputs of door 404
T, output is connected to the reset terminal of rest-set flip-flop 405.In a switch periods, select the first control signal S1 and constant time signal S
TMiddle effective time, long signal was controlled the shutoff operation of master power switch pipe Q1, and the conducting that utilizes the second control signal S2 to control master power switch pipe Q1 is operated, and was applicable to the occasion of all input voltage and output voltage with assurance voltage-type adjuster.Here, upper limit reference voltage V
REF_HWith the lower limit reference voltage V
REF_LNumerical value carry out relative set according to the circuit parameter of voltage-type adjuster and get final product.
The working waveform figure that is depicted as the control circuit of the voltage-type adjuster shown in Fig. 4 A below in conjunction with Fig. 4 B describes its operation principle in detail.
At moment t
0, the first voltage signal V
TriaDrop to the lower limit reference voltage V
REF_L, the second control signal S2 of comparator 401 outputs becomes high level, by set end S, triggers rest-set flip-flop 405, the output signal S of Q end
CtrlBecome high level, thus the output signal T of logic and driver circuitry 106
GBecome high level, master power switch pipe Q1 begins conducting.The first voltage signal V
TriaBegin to rise.
Gate-controlled switch Q in the ramp signal generation circuit 406
TBe in off state, current source I this moment
CHGElectric current to capacitor C
CHGCharge capacitor C
CHGThe voltage at two ends, i.e. ramp signal V
RampContinue to rise.As ramp signal V
RampRise to reference voltage V
REF1The time, at moment t
2, the constant time signal S of comparator 403 outputs
TBecome high level, through holding circuit 407, constant time signal S
TDuration of high level be t constantly
2To current this switch periods end (moment t
4).Holding circuit 407 can obtain by implementations such as timing circuit or rest-set flip-flops, describes no longer for example at this.
Master power switch pipe Q1 is in the conducting state time interval, the first voltage signal V
TriaContinue to rise.As the first voltage signal V
TriaGreater than upper limit reference voltage V
REF_HThe time, the first control signal S1 of comparator 402 outputs begins to become high level.
Owing to the effect of door 404, have only the first control signal S1 and constant time signal S
TWhen being high level simultaneously, rest-set flip-flop 405 just is reset, the driving signal T of master power switch pipe Q1
GJust become low level, since turn-off master power switch pipe Q1.When normal operating conditions, input voltage V
InSpecific output voltage V
OutHeight, both numerical value have certain difference (for example output voltage is 3.3V, and input voltage is 5V), the first voltage signal V
TriaDuty ratio same-phase with master power switch pipe Q1.In a switch periods T, at ramp signal V
RampRise to reference voltage V
REF1(i.e. t constantly before
2Before), the first voltage signal V
TriaGreater than upper limit reference voltage V
REF_H(i.e. t constantly
1), therefore, when this operating state, the off state of master power switch pipe Q1 is by constant time signal S
TControl the ON time t of master power switch pipe Q1
OnKeep constantly, the length of ON time is ramp voltage V
RampRise to reference voltage V
REF1Time.Then, the first voltage signal V
TriaBegin to descend, until dropping to the lower limit reference voltage V again
REF_LThe time (t constantly
4), master power switch pipe Q1 is switched on again, goes round and begins again, and master power switch pipe Q1 works with constant ON time pattern.
Below describe ON time t in detail
OnA kind of implementation of arranging of numerical value.
Current source I is set
CHGNumerical value and the input voltage V of electric current
InRelation in direct ratio, proportionality coefficient are k1; Reference voltage V is set
REF1Numerical value and output voltage V
OutRelation in direct ratio, proportionate relationship are k2; Here suppose capacitor C
CHGCapacitance be C
1, ON time t then
OnCan calculate by following formula (1):
According to the operation principle of voltage-dropping type topological structure, following formula (1) can be converted to following formula (2),
Because ON time t
OnKeep constant, output voltage V
OutWith input voltage V
InRatio keep constantly, namely duty ratio D keeps constantly, therefore, this moment, the switch periods T of voltage-type adjuster was a steady state value, operating frequency is a fixed value, has realized the frequency work of deciding of voltage-type adjuster.Reduce this and brought facility for the design of EMI filtering circuit, reduced circuit cost; And to the interference reduction of other circuit, make the stability of whole voltage-type adjuster strengthen.
As input voltage V
InWith output voltage V
OutDuring very little the or approximately equal of difference (for example output voltage is 3.3V, and input voltage is 3.8V), in order to keep the operate as normal of system, this moment, the voltage-type adjuster was no longer with constant ON time mode of operation work.With reference to the working waveform figure of the control circuit of the voltage-type adjuster shown in the figure 4C, its operation principle is described as follows.
At moment t
0, the first voltage signal V
TriaDrop to the lower limit reference voltage V
REF_L, the second control signal S2 of comparator 401 outputs becomes high level, by set end S, triggers rest-set flip-flop 405, output signal T
GBecome high level, master power switch pipe Q1 begins conducting.The first voltage signal V
TriaBegin to rise.
At this moment, ramp signal V
RampContinue to rise.As ramp signal V
RampRise to reference voltage V
REF1The time, at moment t
1, constant time signal S
TBecome high level, constant time signal S
TDuration of high level be t constantly
1To current this switch periods end (moment t
3).
Master power switch pipe Q1 is in the conducting state time interval, the first voltage signal V
TriaContinue to rise.Because input voltage V
InWith output voltage V
OutDifference is very little, so the first voltage signal V
TriaClimbing speed is very slow, until moment t
2, the first voltage signal V
TriaRise to upper limit reference voltage V
REF_H, the first control signal S1 of comparator 402 outputs begins to become high level.
In a switch periods T, at constant ON time t
OnAfter the end, the first voltage signal V
TriaJust rise to upper limit reference voltage V
REF_HTherefore, when this operating state, the off state of master power switch pipe Q1 is controlled by the first control signal S1.Then, the first voltage signal V
TriaBegin to descend, until dropping to the lower limit reference voltage V again
REF_LThe time (constantly t3), master power switch pipe Q1 is switched on again, to keep the operate as normal of system.
As seen, when this operating state, the switch periods of voltage-type adjuster is elongated, and corresponding operating frequency reduces.
More than describe the realization principle of the voltage-type adjuster of constant ON time control mode in detail.Similarly, for the voltage-type adjuster of constant turn-off time control mode, in each switch periods, when described first voltage signal during greater than described second reference voltage (as a upper limit reference voltage), begin to turn-off the master power switch pipe.When normal operating conditions, after a constant turn-off time, the described master power switch pipe of conducting.The ratio relation in direct ratio of the difference between described constant turn-off time and input voltage and the output voltage and input voltage.When second operating state, when first voltage signal drops to described first reference voltage (as a upper limit reference voltage), the described master power switch pipe of conducting.
Below in conjunction with specific embodiment, describe the operation principle according to the control method of voltage-type adjuster of the present invention in detail.
With reference to figure 5, be depicted as the flow chart according to the control method of the voltage-type adjuster of one embodiment of the invention, it produces a constant output voltage in order to control the state of a voltage-type adjuster with the output at described voltage-type adjuster, may further comprise the steps:
S501: the output voltage of sampled voltage type adjuster, to produce the feedback signal that characterizes described output voltage;
S502: according to the duty ratio of the master power switch pipe of described voltage-type adjuster, generate one with the synchronous ripple signal of described duty ratio;
S503: described feedback signal and described ripple signal are superposeed, to produce first voltage signal;
S504: input voltage and described output voltage according to described voltage-type adjuster produce a constant time signal;
S505: described first voltage signal is compared with a upper limit reference voltage and a lower limit reference voltage respectively, to produce corresponding comparison signal;
S506: when first operating state, described constant time signal is controlled the on off state of the master power switch pipe of described voltage-type adjuster;
S507: when second operating state, described comparison signal is controlled the on off state of described master power switch pipe.
Wherein, the ripple signal can obtain by multiple implementation method.Fig. 6 has enumerated the production method flow chart of a kind of acquisition and the synchronous ripple signal of duty ratio, and concrete may further comprise the steps:
S601: the node voltage of sampled voltage type adjuster;
S602: described node voltage is carried out filtering, to obtain first filtering voltage;
S603: described first filtering voltage is carried out filtering, to obtain second filtering voltage;
S604: described first filtering voltage and described second filtering voltage are carried out the difference computing, to obtain a difference voltage;
S605: described difference voltage and a proportionality coefficient are multiplied each other, to obtain described ripple signal.
In the constant ON time control method according to one embodiment of the invention, the control step of the master power switch pipe of voltage-type adjuster comprises:
In each switch periods, when described first voltage signal during less than described lower limit reference voltage, the described master power switch pipe of conducting;
When first operating state, input voltage V for example
InSpecific output voltage V
OutHeight, both numerical value have certain difference (for example output voltage is 3.3V, and input voltage is 5V), when the ON time of described power switch pipe arrives a constant ON time of described constant time signal sign, turn-off described master power switch pipe;
When second operating state, for example as input voltage V
InWith output voltage V
OutDuring very little the or approximately equal of difference (for example output voltage is 3.3V, and input voltage is 3.8V), in order to keep the operate as normal of system, this moment, the voltage-type adjuster was no longer with constant ON time mode of operation work.But according to the comparative result of described first voltage signal and described upper limit reference voltage, when described first voltage signal rises to described upper limit reference voltage, turn-off described master power switch pipe.
According to the control method of the voltage-type adjuster of the embodiment of the invention, according to the magnitude relationship between input voltage and the output voltage, select corresponding cut-off signals implementation.Wherein, the ratio relation in direct ratio of described constant ON time and described output voltage and described input voltage, thereby when constant ON time control model, the switch periods T that keeps the voltage-type adjuster is a steady state value, operating frequency is a fixed value, has realized the frequency work of deciding of voltage-type adjuster.Reduce this and brought facility for the design of EMI filtering circuit, reduced circuit cost; And to the interference reduction of other circuit, make the stability of whole voltage-type adjuster strengthen.
In the constant turn-off time control method according to another embodiment of the present invention, the control step of the master power switch pipe of voltage-type adjuster comprises:
In each switch periods, when described first voltage signal during greater than described upper limit reference voltage, turn-off described master power switch pipe;
When first operating state, during constant turn-off time of arriving that described constant time signal characterizes when the turn-off time of described power switch pipe, the described master power switch pipe of conducting;
When second operating state, according to the comparative result of described first voltage signal and described lower limit reference voltage, when described first voltage signal drops to described lower limit reference voltage, the described master power switch pipe of conducting.
Wherein, the ratio relation in direct ratio of the difference between described constant turn-off time and described input voltage and the described output voltage and described input voltage, it is constant to keep the system works frequency.
Need to prove; the device function that title is identical between each embodiment of the present invention is also identical; the structure of each circuit comprises but is not limited to above disclosed form; as long as can realize the function of the described interlock circuit of the embodiment of the invention; therefore; the relevant improvement that those skilled in the art do on the basis of the disclosed circuit of the embodiment of the invention is also within the protection range of the embodiment of the invention.
In addition, also need to prove, in this article, relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint and have the relation of any this reality or in proper order between these entities or the operation.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or also be included as the intrinsic key element of this process, method, article or equipment.Do not having under the situation of more restrictions, the key element that is limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
As indicated above according to embodiments of the invention, these embodiment do not have all details of detailed descriptionthe, do not limit this invention yet and only are described specific embodiment.Obviously, according to above description, can make many modifications and variations.These embodiment are chosen and specifically described to this specification, is in order to explain principle of the present invention and practical application better, thereby the technical field technical staff can utilize the present invention and the modification on basis of the present invention to use well under making.The present invention only is subjected to the restriction of claims and four corner and equivalent.
Claims (15)
1. the control method of a voltage-type adjuster in order to control the state of a voltage-type adjuster, produces a constant output voltage with the output at described voltage-type adjuster, it is characterized in that, may further comprise the steps:
The described output voltage of sampling is to produce the feedback signal that characterizes described output voltage;
According to the duty ratio of the master power switch pipe of described voltage-type adjuster, generate one with the synchronous ripple signal of described duty ratio;
Described feedback signal and described ripple signal are superposeed, to produce first voltage signal;
Input voltage and described output voltage according to described voltage-type adjuster produce a constant time signal;
Described first voltage signal is compared with a upper limit reference voltage and a lower limit reference voltage respectively, to produce corresponding comparison signal;
When first operating state, described constant time signal is controlled the on off state of the master power switch pipe of described voltage-type adjuster;
When second operating state, described comparison signal is controlled the on off state of described master power switch pipe.
2. the control method of voltage-type adjuster according to claim 1 is characterized in that, the generation step of described ripple signal comprises:
The sample node voltage of described voltage-type adjuster;
Described node voltage is carried out filtering, to obtain first filtering voltage;
Described first filtering voltage is carried out filtering, to obtain second filtering voltage;
Described first filtering voltage and described second filtering voltage are carried out the difference computing, to obtain a difference voltage;
Described difference voltage and a proportionality coefficient are multiplied each other, to obtain described ripple signal.
3. the control method of voltage-type adjuster according to claim 1 is characterized in that, the control step of described master power switch pipe comprises:
In each switch periods, when described first voltage signal during less than described lower limit reference voltage, the described master power switch pipe of conducting;
When first operating state, when the ON time of described master power switch pipe arrives a constant ON time of described constant time signal sign, turn-off described master power switch pipe;
When second operating state, according to the comparative result of described first voltage signal and described upper limit reference voltage, when described first voltage signal rises to described upper limit reference voltage, turn-off described master power switch pipe.
4. the control method of voltage-type adjuster according to claim 3 is characterized in that, the ratio relation in direct ratio of described constant ON time and described output voltage and described input voltage.
5. the control method of voltage-type adjuster according to claim 1 is characterized in that, the control step of described master power switch pipe comprises:
In each switch periods, when described first voltage signal during greater than described upper limit reference voltage, turn-off described master power switch pipe;
When first operating state, during constant turn-off time of arriving that described constant time signal characterizes when the turn-off time of described master power switch pipe, the described master power switch pipe of conducting;
When second operating state, according to the comparative result of described first voltage signal and described lower limit reference voltage, when described first voltage signal drops to described lower limit reference voltage, the described master power switch pipe of conducting.
6. the control method of voltage-type adjuster according to claim 5 is characterized in that, the ratio relation in direct ratio of the difference between described constant turn-off time and described input voltage and the described output voltage and described input voltage.
7. the control circuit of a voltage-type adjuster in order to control a voltage-type adjuster, produces a constant output voltage with the output at described voltage-type adjuster, it is characterized in that, comprise, first control circuit, constant time generating circuit, second control circuit, wherein
First voltage signal and first reference voltage of described first control circuit in order to relatively to receive produces first control signal;
The duty ratio same-phase of the master power switch pipe in described first voltage signal and the described voltage-type adjuster;
Described constant time generating circuit produces a constant time signal in order to the input voltage according to described output voltage and described voltage-type adjuster;
Described first voltage signal and second reference voltage of described second control circuit in order to relatively to receive produces second control signal;
When first operating state, described constant time signal and described second control signal are controlled the on off state of the master power switch pipe of described voltage-type adjuster;
When second operating state, described first control signal and described second control signal are controlled the on off state of described master power switch pipe.
8. the control circuit of voltage-type adjuster according to claim 7 is characterized in that, also comprises the ripple signal generating circuit, and described ripple signal generating circuit receives the node voltage of described voltage-type adjuster, to produce described ripple signal according to this; Described ripple signal and the feedback signal stack that characterizes described output voltage are to produce described first voltage signal.
9. the control circuit of voltage-type adjuster according to claim 7, it is characterized in that, also comprise a logical circuit, described logical circuit receives described first control signal, described constant time signal and described second control signal are controlled the on off state of described master power switch pipe to produce control signal.
10. the control circuit of voltage-type adjuster according to claim 7 is characterized in that, in each switch periods, and when described first voltage signal during less than described second reference voltage, the described master power switch pipe of beginning conducting.
11. the control circuit of voltage-type adjuster according to claim 10, it is characterized in that, when first operating state, the ON time that described constant time signal is controlled described master power switch pipe is a steady state value, the ratio relation in direct ratio of described ON time and described output voltage and described input voltage; Through after the described ON time, turn-off described master power switch pipe.
12. the control circuit of voltage-type adjuster according to claim 10 is characterized in that, when second operating state, when described first voltage signal rises to described first reference voltage, turn-offs described master power switch pipe.
13. the control circuit of voltage-type adjuster according to claim 7 is characterized in that, in each switch periods, when described first voltage signal during greater than described second reference voltage, begins to turn-off described master power switch pipe.
14. the control circuit of voltage-type adjuster according to claim 13, it is characterized in that, when first operating state, the turn-off time that described constant time signal is controlled described master power switch pipe is a steady state value, the ratio relation in direct ratio of the difference between described turn-off time and described input voltage and the described output voltage and described input voltage; Through after the described turn-off time, the described master power switch pipe of conducting.
15. the control circuit of voltage-type adjuster according to claim 13 is characterized in that, when second operating state, and when described first voltage signal drops to described first reference voltage, the described master power switch pipe of conducting.
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| CN201310115707.2A CN103199703B (en) | 2013-04-03 | 2013-04-03 | A kind of control circuit of voltage-type regulator and control method thereof |
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| CN103580456A (en) * | 2013-11-26 | 2014-02-12 | 矽力杰半导体技术(杭州)有限公司 | Switching power supply control method and circuit as well as switching power supply with switching power supply control circuit |
| CN107104594A (en) * | 2016-02-23 | 2017-08-29 | 精工半导体有限公司 | Switching regulaor |
| CN107394998A (en) * | 2017-06-12 | 2017-11-24 | 矽力杰半导体技术(杭州)有限公司 | Control circuit, control method and switching power supply |
| CN104319998B (en) * | 2014-09-29 | 2017-12-05 | 矽力杰半导体技术(杭州)有限公司 | A kind of switching power source control circuit, Switching Power Supply and control method |
| CN108880237A (en) * | 2018-07-12 | 2018-11-23 | 矽力杰半导体技术(杭州)有限公司 | The switch time generation circuit and switch time control method of switch converters |
| CN109004812A (en) * | 2018-07-03 | 2018-12-14 | 矽力杰半导体技术(杭州)有限公司 | Switch converters and its control circuit and control method |
| TWI675537B (en) * | 2014-07-07 | 2019-10-21 | 大陸商矽力杰半導體技術（杭州）有限公司 | Control circuit, switching power supply and control method |
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| CN103580456B (en) * | 2013-11-26 | 2016-04-20 | 矽力杰半导体技术(杭州)有限公司 | Switching Power Supply control method and control circuit and the Switching Power Supply with this control circuit |
| CN103580456A (en) * | 2013-11-26 | 2014-02-12 | 矽力杰半导体技术(杭州)有限公司 | Switching power supply control method and circuit as well as switching power supply with switching power supply control circuit |
| TWI675537B (en) * | 2014-07-07 | 2019-10-21 | 大陸商矽力杰半導體技術（杭州）有限公司 | Control circuit, switching power supply and control method |
| CN104319998B (en) * | 2014-09-29 | 2017-12-05 | 矽力杰半导体技术(杭州)有限公司 | A kind of switching power source control circuit, Switching Power Supply and control method |
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| CN107394998A (en) * | 2017-06-12 | 2017-11-24 | 矽力杰半导体技术(杭州)有限公司 | Control circuit, control method and switching power supply |
| CN111194514B (en) * | 2017-08-11 | 2021-06-04 | 莱恩半导体股份有限公司 | System for charging battery using wireless charging signal |
| CN111194514A (en) * | 2017-08-11 | 2020-05-22 | 莱恩半导体股份有限公司 | System for charging battery using wireless charging signal |
| CN109004812A (en) * | 2018-07-03 | 2018-12-14 | 矽力杰半导体技术(杭州)有限公司 | Switch converters and its control circuit and control method |
| US10826380B2 (en) | 2018-07-03 | 2020-11-03 | Silergy Semiconductor Technology (Hangzhou) Ltd | Switching converter, circuit and method for controlling the same |
| CN109004812B (en) * | 2018-07-03 | 2020-09-15 | 矽力杰半导体技术(杭州)有限公司 | Switch converter and control circuit and control method thereof |
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Address after: 310051 No. 6 Lianhui Street, Xixing Street, Binjiang District, Hangzhou City, Zhejiang Province Patentee after: Silergy Semiconductor Technology (Hangzhou ) Co., Ltd. Address before: 310012 Wensanlu Road, Hangzhou Province, No. 90 East Software Park, science and technology building A1501 Patentee before: Silergy Semiconductor Technology (Hangzhou ) Co., Ltd. |