CN103199703B - A kind of control circuit of voltage-type regulator and control method thereof - Google Patents
A kind of control circuit of voltage-type regulator and control method thereof Download PDFInfo
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- CN103199703B CN103199703B CN201310115707.2A CN201310115707A CN103199703B CN 103199703 B CN103199703 B CN 103199703B CN 201310115707 A CN201310115707 A CN 201310115707A CN 103199703 B CN103199703 B CN 103199703B
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Abstract
The present invention relates to a kind of control circuit and control method thereof of voltage-type regulator.Control method according to the voltage-type regulator of one embodiment of the invention will characterize the feedback signal of output voltage and superpose with the synchronous ripple signal of duty ratio, to produce the first voltage signal; By comparing, to produce corresponding comparison signal of the first voltage signal and a upper limit reference voltage and a lower limit reference voltage; When the first operating state, by the on off state of the master power switch pipe of voltage-type regulator described in Time constant signal controlling; When the second operating state, controlled the on off state of described master power switch pipe by described comparison signal.
Description
Technical field
The present invention relates to field of switch power, in particular, relate to a kind of can the control circuit of voltage-type regulator of Time constant control model of Automatic adjusument and control method thereof.
Background technology
Voltage regulator, such as direct current-direct current voltage converter, provide stable voltage source in order to give dissimilar electronic equipment.Battery management for some lower powered equipment (such as 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 carries out filtering process to produce a VD to this high-frequency input voltage signal.Voltage-type regulator generally includes a switch, an input dc power potential source (as battery) is alternately coupled and decoupling zero in load (as integrated circuit); An output filtering device, generally include an inductance and an electric capacity, it is connected between input voltage source and load, in order to carry out filtering process to the output of switch, and then provides a VD; Control device (such as pulse width regulator (PWM), frequency pulse adjuster etc.) in order to control switch to obtain the VD of a relative constancy.
In prior art, voltage-type regulator can adopt multiple control modes, such as voltage mode control or current control mode or Time constant control model.With reference to figure 1, be depicted as a kind of theory diagram adopting the control circuit of the voltage-type regulator of constant on-time control model adopting prior art.In this implementation, output voltage V
outthrough divider resistance R
fb1with resistance R
fb2after carrying out dividing potential drop, obtain feedback signal V
fB.The 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 and door 103 input.The output signal of minimum turn-off time generating circuit 102 is received 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 circuit for generating 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 drive singal.
Its detailed operation is as follows: as feedback signal V
fBdrop to reference voltage V
reftime, 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, be then high level with the output signal of door 103, with set rest-set flip-flop 105, the output signal of output Q is high level.By logic and driver circuitry 106, by master power switch pipe Q1 conducting, and synchronizing power switching tube Q2 is turned off, thus feedback signal V
fBstart to rise.After the conducting state duration of master power switch pipe Q1 arrives the Time constant that 104 timing of constant on-time circuit for generating produce, master power switch pipe Q1 is turned off, then now feedback signal V
fBstart to decline, until again drop to reference voltage V
ref.Go round and begin again, by this constant on-time control model, control output voltage V
outmaintain substantially constant.
But, adopt this control mode, as output voltage V
outwith input voltage V
inclosely, or during approximately equal, now wish that the conducting duty ratio of master power switch pipe Q1 close to 1, namely can be in full-gear.But the length of Time constant produced due to constant on-time circuit for generating 104 and the existence of minimum turn-off time, make the conducting duty ratio of master power switch pipe Q1 cannot as far as possible close to 1.Therefore, when this situation, system cannot normally work, and cannot obtain stable output voltage.On the other hand, when the output loading generation saltus step of voltage-type regulator, due to the existence of constant on-time, make the transient response speed of load very slow.Such as, when output loading increases suddenly, now there is sudden change from low to high in output current, and because constant on-time is fixing, therefore, control circuit cannot turn off master power switch pipe in time, 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 regulator, slow to solve transient response speed in prior art, and the problem such as input voltage and the approximately equalised job stability of output voltage.
According to the control method of a kind of voltage-type regulator of the present invention, in order to control the state of a voltage-type regulator, to produce a constant output voltage at the output of described voltage-type regulator, comprise the following steps:
To sample described output voltage, to produce the feedback signal characterizing described output voltage;
According to the duty ratio of the master power switch pipe of described voltage-type regulator, generate one and the synchronous ripple signal of described duty ratio;
Described feedback signal and described ripple signal are superposed, to produce the first voltage signal;
According to input voltage and the described output voltage of described voltage-type regulator, produce a Time constant signal;
Described first voltage signal is compared with a upper limit reference voltage and a lower limit reference voltage, to produce corresponding comparison signal respectively;
When the first operating state, the on off state of the master power switch pipe of voltage-type regulator described in described Time constant signal controlling;
When the second operating state, described comparison signal controls the on off state of described master power switch pipe.
Further, the generating step of described ripple signal comprises:
The node voltage of described voltage-type regulator of sampling;
Filtering is carried out to described node voltage, to obtain the first filtering voltage;
Filtering is carried out to described first filtering voltage, to obtain the second filtering voltage;
Described first filtering voltage and described second filtering voltage are carried out difference operation, to obtain a difference voltage;
Described difference voltage is multiplied with a proportionality coefficient, to obtain described ripple signal.
Further, the rate-determining steps of described master power switch pipe comprises:
In each switch periods, when described first voltage signal is less than described lower limit reference voltage, master power switch pipe described in conducting;
When the first operating state, when the ON time of described master power switch pipe arrives a constant on-time of described Time constant characterization, turn off described master power switch pipe;
When the 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 direct proportionality of described constant on-time and described output voltage and described input voltage.
Further, the rate-determining steps of described master power switch pipe comprises:
In each switch periods, when described first voltage signal is greater than described upper limit reference voltage, turn off described master power switch pipe;
When the first operating state, when the turn-off time of described master power switch pipe arrives a constant off-time of described Time constant characterization, master power switch pipe described in conducting;
When the 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, master power switch pipe described in conducting.
Preferably, the ratio direct proportionality of described constant off-time and the difference between described input voltage and described output voltage and described input voltage.
According to the control circuit of a kind of voltage-type regulator of the present invention, in order to control a voltage-type regulator, to produce a constant output voltage at the output of described voltage-type regulator, comprise, first control circuit, Time constant circuit for generating, second control circuit, wherein
Described first control circuit, in order to compare the first voltage signal and the first reference voltage that receive, produces the first control signal;
The duty ratio same-phase of the master power switch pipe in described first voltage signal and described voltage-type regulator;
Described Time constant circuit for generating is in order to produce a Time constant signal according to the input voltage of described output voltage and described voltage-type regulator;
Described second control circuit, in order to compare described first voltage signal and the second reference voltage that receive, produces the second control signal;
When the first operating state, described Time constant signal and described second control signal control the on off state of the master power switch pipe of described voltage-type regulator;
When the second operating state, described first control signal and described second control signal control the on off state of described master power switch pipe.
Further, also comprise ripple signal circuit for generating, described ripple signal circuit for generating receives the node voltage of described voltage-type regulator, to produce described ripple signal according to this; Described ripple signal superposes with the feedback signal characterizing described output voltage, to produce described first voltage signal.
Further, also comprise a logical circuit, described logical circuit receives described first control signal, and described Time constant signal and described second control signal, to produce control signal to control the on off state of described master power switch pipe.
Preferably, in each switch periods, when described first voltage signal is less than described second reference voltage, start master power switch pipe described in conducting.
Preferably, when the first operating state, described in described Time constant signal controlling, the ON time of master power switch pipe is a steady state value, the ratio direct proportionality of described ON time and described output voltage and described input voltage; After described ON time, turn off described master power switch pipe.
Preferably, when the 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 is greater than described second reference voltage, start to turn off described master power switch pipe.
Preferably, when the first operating state, the turn-off time of master power switch pipe described in described Time constant signal controlling is a steady state value, the ratio direct proportionality of described turn-off time and the difference between described input voltage and described output voltage and described input voltage; After the described turn-off time, master power switch pipe described in conducting.
Preferably, when the second operating state, when described first voltage signal drops to described first reference voltage, master power switch pipe described in conducting.
According to control circuit and the control method thereof of the voltage-type regulator of the embodiment of the present invention, the synchronous ripple signal of duty ratio of superposition one and master power switch pipe in the feedback signal characterizing output voltage.By setting upper limit reference voltage and lower limit reference voltage value between numerical values recited relation, and a Time constant information relevant to input voltage and output voltage, when normal operating conditions, control master power switch pipe with Time constant work pattern, and the operating frequency of ME for maintenance type adjuster is fixing; And when abnormal operation, such as, when output voltage is close to input voltage, system is no longer with Time constant work pattern, but determined by the magnitude relationship between the upper limit reference voltage set or lower limit reference voltage value, thus reduce the operating frequency of voltage-type regulator, make system still can maintain constant output voltage in such cases.
Accompanying drawing explanation
Figure 1 shows that a kind of theory diagram adopting the control circuit of the voltage-type regulator of constant on-time control model adopting prior art;
Figure 2 shows that the theory diagram of the control circuit of the voltage-type regulator according to first embodiment of the invention;
Fig. 3 A is depicted as the theory diagram of the ripple signal circuit for generating according to one embodiment of the invention;
Fig. 3 B is depicted as the working waveform figure of the ripple signal circuit for generating shown in Fig. 3 A;
Fig. 4 A is depicted as the theory diagram of the control circuit of the voltage-type regulator according to second embodiment of the invention;
Fig. 4 B is depicted as the working waveform figure of control circuit when the first operating state of the voltage-type regulator shown in Fig. 4 A;
Fig. 4 C is depicted as the working waveform figure of control circuit when the second operating state of the voltage-type regulator shown in Fig. 4 A;
Figure 5 shows that the workflow diagram of the control method of the voltage-type regulator according to one embodiment of the invention;
Figure 6 shows that according to a kind of production method flow chart with the synchronous ripple signal of master power switch pipe duty ratio that obtains of the present invention.
Embodiment
Below in conjunction with accompanying drawing, several preferred embodiment of the present invention is described in detail, but the present invention is not restricted to these embodiments.The present invention contain any make on marrow of the present invention and scope substitute, amendment, equivalent method and scheme.To have the present invention to make the public and understand thoroughly, 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 completely for a person skilled in the art.
With reference to figure 2, be depicted as the theory diagram of the control circuit of the voltage-type regulator according to first embodiment of the invention.In this embodiment, master power switch pipe Q1, synchronizing power switching tube Q2, inductance L
0with electric capacity C
0form a voltage-dropping type power stage circuit.
Control circuit 200 comprises first control circuit 201, Time constant circuit for generating 202, second control circuit 203 and logical circuit 204; Wherein,
First control circuit 201 is in order to compare the first voltage signal V received
triawith the first reference voltage V
ref1, produce the first control signal S1.
First voltage signal V
triaby feedback signal V
fBwith a ripple signal V
ripplesuperposition produces; Here, ripple signal V
ripplewith the duty ratio same-phase of the master power switch pipe Q1 in voltage-type regulator.
The input voltage V that Time constant circuit for generating 202 receives in order to basis
in, output voltage V
outand control signal S
ctrlproduce a Time constant signal S
t.
Second control circuit 203 is in order to compare the first voltage signal V received
triawith the second reference voltage V
ref2, to produce the second control signal S2.
Logical circuit 204 receives the first control signal S1, Time constant signal S
twith the second control signal S2, with when the different operating state of voltage-type regulator, produce corresponding control signal S
ctrlcontrol the on off state of master power switch pipe Q1.
When the first operating state, when namely voltage-type regulator is in normal operating conditions, logical circuit 204 is according to Time constant signal S
tthe on off state of master power switch pipe Q1 is controlled with the second control signal S2.Voltage-type regulator is with Time constant work pattern, and operating frequency remains constant.
When the second operating state, namely the output voltage of voltage-type regulator and input voltage very close to time, logical circuit 204 controls the on off state of master power switch pipe Q1 according to the first control signal S1 and the second control signal S2.Voltage-type regulator is no longer with Time constant work pattern, and operating frequency is reduced, and to ensure that now voltage-type regulator normally works, output voltage remains constant.
Here, ripple signal V
ripplecan be obtained by multiple different implementation.Fig. 3 lists a kind of specific embodiment.With reference to figure 3A, ripple signal circuit for generating 300 comprises the first filter circuit be made up of resistance R1 and electric capacity C1 be connected in series and the second filter circuit be made up of resistance R2 and electric capacity C2.First filter circuit and the second filter circuit are the filter circuit with higher time constant.Concrete, the node voltage V of the first filter circuit receiver voltage type adjuster
lX, due to 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
lXcarry out after filtering through the first filter circuit, generate the first average voltage V of 13 jiao of waveform shape at the points of common connection place of resistance R1 and electric capacity C1
ave1.Then, the first average voltage V
ave1carry out filtering through the 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 R2 and electric capacity C2
ave2, as shown in Figure 3 B.Second average voltage V
ave2peak-to-peak value be less than the first average voltage V
ave1.By the first average voltage V
ave1with the second average voltage V
ave2carry out subtraction, and carry out certain scale operation, thus obtain ripple signal V
ripple.
According to the ripple signal V of the embodiment of the present invention
ripplewith the duty ratio same-phase of the master power switch pipe Q1 in voltage-type regulator, and there is no DC component, when the conducting of master power switch pipe, there is the rate of rise, when the conducting of synchronizing power switching tube, there is descending slope.
Below in conjunction with specific embodiment, describe the specific implementation of each circuit structure of the control circuit according to voltage-type regulator of the present invention in detail.
With reference to figure 4A, be depicted as the theory diagram of the control circuit of the voltage-type regulator according to 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 the first voltage signal V be formed by stacking
tria, inverting input receives upper limit reference voltage V
rEF_H(the first reference voltage).
Time constant circuit for generating comprises ramp generator 406, comparator 403 and holding circuit 407.The inverting input of comparator 403 receives one and output voltage V
outthe reference voltage V of proportional relation
rEF1, in-phase input end receives the ramp signal V that ramp generator 406 exports
ramp.The output signal of comparator 403 is carried out sampling through holding circuit 407 and is kept.A kind of specific implementation of ramp generator 406 is as follows: current source I
cHG, charging capacitor C
cHGwith gate-controlled switch Q
tbetween the in-phase input end being connected in comparator 403 each other in parallel and ground.Wherein, current source I
cHGelectric current and input voltage V
indirect proportionality, gate-controlled switch Q
ton off state contrary with the on off state of master power switch pipe Q1.
Second control circuit comprises comparator 401, and its in-phase input end receives lower limit reference voltage V
rEF_L(the second reference voltage), inverting input receives the first voltage signal V
tria.
Logical circuit comprises and door 404 and rest-set flip-flop 405.The first control signal S1 and Time constant signal S is received 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 Time constant signal S
tmiddle effective time, longer signal controlled the shutoff operation of master power switch pipe Q1, utilized the second control signal S2 to control the conducting operation of master power switch pipe Q1, to ensure that voltage-type regulator is applicable to all input voltages and the occasion of output voltage.Here, upper limit reference voltage V
rEF_Hwith lower limit reference voltage V
rEF_Lnumerical value carry out relative set according to the circuit parameter of voltage-type regulator.
The working waveform figure of the control circuit of the voltage-type regulator shown in Fig. 4 A is depicted as to describe its operation principle in detail below in conjunction with Fig. 4 B.
At moment t
0, the first voltage signal V
triadrop to lower limit reference voltage V
rEF_L, the second control signal S2 that comparator 401 exports becomes high level, by set end S, and the output signal S that triggered RS flip-flop 405, Q is held
ctrlbecome high level, thus the output signal T of logic and driver circuitry 106
gbecome high level, master power switch pipe Q1 starts conducting.First voltage signal V
triastart to rise.
Gate-controlled switch Q in ramp generator 406
tnow be in off state, current source I
cHGelectric current to electric capacity C
cHGcharge, electric capacity C
cHGthe voltage at two ends, i.e. ramp signal V
rampcontinue to rise.As ramp signal V
ramprise to reference voltage V
rEF1time, at moment t
2, the Time constant signal S that comparator 403 exports
tbecome high level, through holding circuit 407, Time constant signal S
tduration of high level be moment t
2(moment t is terminated to this switch periods current
4).Holding circuit 407 can be obtained by the implementation such as timing circuit or rest-set flip-flop, and no longer illustrating at this is described.
Master power switch pipe Q1 is in conducting state time interval, the first voltage signal V
triacontinue to rise.As the first voltage signal V
triabe greater than upper limit reference voltage V
rEF_Htime, the first control signal S1 that comparator 402 exports starts to become high level.
Due to the effect with door 404, only has the first control signal S1 and Time constant signal S
twhen being high level, rest-set flip-flop 405 is just reset simultaneously, the drive singal 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 has certain difference (such as output voltage is 3.3V, and input voltage is 5V), the first voltage signal V
triawith the duty ratio same-phase of master power switch pipe Q1.In a switch periods T, at ramp signal V
ramprise to reference voltage V
rEF1(i.e. moment t before
2before), the first voltage signal V
triabe greater than upper limit reference voltage V
rEF_H(i.e. moment t
1), therefore, when this operating state, the off state of master power switch pipe Q1 is by Time constant signal S
tcontrol, the ON time t of master power switch pipe Q1
onmaintain constant, the length of ON time is ramp voltage V
ramprise to reference voltage V
rEF1time.Then, the first voltage signal V
triastart to decline, until again drop to lower limit reference voltage V
rEF_Ltime (moment t
4), master power switch pipe Q1 is switched on again, goes round and begins again, and master power switch pipe Q1 is with constant on-time work pattern.
Below describe ON time t in detail
onnumerical value arrange a kind of implementation.
Current source I is set
cHGthe numerical value of electric current and input voltage V
indirect proportionality, proportionality coefficient is k1; Reference voltage V is set
rEF1numerical value and output voltage V
outdirect proportionality, proportionate relationship is k2; Here electric capacity C is supposed
cHGcapacitance be C
1, then ON time t
onfollowing formula (1) can be passed through calculate:
According to the operation principle of voltage-dropping type topological structure, above formula (1) can be converted to following formula (2),
Due to ON time t
onmaintain constant, output voltage V
outwith input voltage V
inratio maintain constant, namely duty ratio D maintain constant, therefore, now the switch periods T of voltage-type regulator is a steady state value, and operating frequency is a fixed value, and what achieve voltage-type regulator determines frequency work.Reduce this and bring facility to the design of EMI filtering circuit, decrease circuit cost; And to the interference reduction of other circuit, the stability of whole voltage-type regulator is strengthened.
As input voltage V
inwith output voltage V
outduring very little the or approximately equal of difference (such as output voltage is 3.3V, and input voltage is 3.8V), in order to maintain the normal work of system, now voltage-type regulator is no longer with constant on-time mode of operation.With reference to the working waveform figure of the control circuit of the voltage-type regulator shown in figure 4C, its operation principle is described as follows.
At moment t
0, the first voltage signal V
triadrop to lower limit reference voltage V
rEF_L, the second control signal S2 that comparator 401 exports becomes high level, by set end S, and triggered RS flip-flop 405, output signal T
gbecome high level, master power switch pipe Q1 starts conducting.First voltage signal V
triastart to rise.
Now, ramp signal V
rampcontinue to rise.As ramp signal V
ramprise to reference voltage V
rEF1time, at moment t
1, Time constant signal S
tbecome high level, Time constant signal S
tduration of high level be moment t
1(moment t is terminated to this switch periods current
3).
Master power switch pipe Q1 is in conducting state time interval, the first voltage signal V
triacontinue to rise.Due to 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 that comparator 402 exports starts to become high level.
In a switch periods T, at constant on-time t
onafter end, the first voltage signal V
triajust rise to upper limit reference voltage V
rEF_H.Therefore, 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
triastart to decline, until again drop to lower limit reference voltage V
rEF_Ltime (moment t3), master power switch pipe Q1 is switched on again, to maintain the normal work of system.
Visible, when this operating state, the switch periods of voltage-type regulator is elongated, and corresponding operating frequency reduces.
What more than describe the voltage-type regulator of constant on-time control mode in detail realizes principle.Similar, for the voltage-type regulator of constant off-time control mode, in each switch periods, when described first voltage signal is greater than described second reference voltage (as a upper limit reference voltage), start to turn off master power switch pipe.When normal operating conditions, after a constant off-time, master power switch pipe described in conducting.The ratio direct proportionality of described constant off-time and the difference between input voltage and output voltage and input voltage.When the second operating state, when the first voltage signal drops to described first reference voltage (as a upper limit reference voltage), master power switch pipe described in conducting.
Below in conjunction with specific embodiment, describe the operation principle of the control method according to voltage-type regulator of the present invention in detail.
With reference to figure 5, be depicted as the flow chart of the control method of the voltage-type regulator according to one embodiment of the invention, it is in order to control the state of a voltage-type regulator, to produce a constant output voltage at the output of described voltage-type regulator, comprises the following steps:
S501: the output voltage of sampled voltage type adjuster, to produce the feedback signal characterizing described output voltage;
S502: according to the duty ratio of the master power switch pipe of described voltage-type regulator, generates one and the synchronous ripple signal of described duty ratio;
S503: described feedback signal and described ripple signal are superposed, to produce the first voltage signal;
S504: according to input voltage and the described output voltage of described voltage-type regulator, produce a Time constant signal;
S505: described first voltage signal is compared with a upper limit reference voltage and a lower limit reference voltage, to produce corresponding comparison signal respectively;
S506: when the first operating state, the on off state of the master power switch pipe of voltage-type regulator described in described Time constant signal controlling;
S507: when the second operating state, described comparison signal controls the on off state of described master power switch pipe.
Wherein, ripple signal can be obtained by multiple implementation method.Fig. 6 lists a kind of production method flow chart with the synchronous ripple signal of duty ratio that obtains, and concrete comprises the following steps:
S601: the node voltage of sampled voltage type adjuster;
S602: carry out filtering to described node voltage, to obtain the first filtering voltage;
S603: carry out filtering to described first filtering voltage, to obtain the second filtering voltage;
S604: described first filtering voltage and described second filtering voltage are carried out difference operation, to obtain a difference voltage;
S605: described difference voltage be multiplied with a proportionality coefficient, to obtain described ripple signal.
According in the constant on-time control method of one embodiment of the invention, the rate-determining steps of the master power switch pipe of voltage-type regulator comprises:
In each switch periods, when described first voltage signal is less than described lower limit reference voltage, master power switch pipe described in conducting;
When the first operating state, such as input voltage V
inspecific output voltage V
outheight, both numerical value has certain difference (such as 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 Time constant characterization, turns off described master power switch pipe;
When the second operating state, such as, as input voltage V
inwith output voltage V
outduring very little the or approximately equal of difference (such as output voltage is 3.3V, and input voltage is 3.8V), in order to maintain the normal work of system, now voltage-type regulator is no longer with constant on-time mode of operation.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 regulator of the embodiment of the present invention, according to the magnitude relationship between input voltage and output voltage, select corresponding cut-off signals implementation.Wherein, the ratio direct proportionality of described constant on-time and described output voltage and described input voltage, thus when constant on-time control model, the switch periods T of ME for maintenance type adjuster is a steady state value, operating frequency is a fixed value, and what achieve voltage-type regulator determines frequency work.Reduce this and bring facility to the design of EMI filtering circuit, decrease circuit cost; And to the interference reduction of other circuit, the stability of whole voltage-type regulator is strengthened.
According in the constant off-time control method of another embodiment of the present invention, the rate-determining steps of the master power switch pipe of voltage-type regulator comprises:
In each switch periods, when described first voltage signal is greater than described upper limit reference voltage, turn off described master power switch pipe;
When the first operating state, when the turn-off time of described power switch pipe arrives a constant off-time of described Time constant characterization, master power switch pipe described in conducting;
When the 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, master power switch pipe described in conducting.
Wherein, the ratio direct proportionality of described constant off-time and the difference between described input voltage and described output voltage and described input voltage, it is constant to maintain system operating frequency.
It should be noted that; the device function that between each embodiment of the present invention, title is identical is also identical; the structure of each circuit comprises but is not limited to above disclosed form; as long as the function of the interlock circuit described in the embodiment of the present invention can be realized; therefore; the relevant improvement that those skilled in the art do on the basis of circuit disclosed in the embodiment of the present invention, also within the protection range of the embodiment of the present invention.
In addition, also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
According to embodiments of the invention as described above, these embodiments do not have all details of detailed descriptionthe, do not limit the specific embodiment that this invention is only described yet.Obviously, according to above description, can make many modifications and variations.This specification is chosen and is specifically described these embodiments, is to explain principle of the present invention and practical application better, thus makes art technical staff that the present invention and the amendment on basis of the present invention can be utilized well to use.The present invention is only subject to the restriction of claims and four corner and equivalent.
Claims (15)
1. a control method for voltage-type regulator, in order to control the state of a voltage-type regulator, to produce a constant output voltage at the output of described voltage-type regulator, is characterized in that, comprise the following steps:
To sample described output voltage, to produce the feedback signal characterizing described output voltage;
According to the duty ratio of the master power switch pipe of described voltage-type regulator, generate one and the synchronous ripple signal of described duty ratio;
Described feedback signal and described ripple signal are superposed, to produce the first voltage signal;
According to input voltage and the described output voltage of described voltage-type regulator, produce a Time constant signal;
Described first voltage signal is compared with a upper limit reference voltage and a lower limit reference voltage, respectively to produce the first control signal and the second control signal respectively;
When the first operating state, the on off state of the master power switch pipe of described voltage-type regulator is controlled according to described Time constant signal and described second control signal, to make described voltage-type regulator with Time constant work pattern, and operating frequency remains constant;
When the second operating state, control the on off state of described master power switch pipe according to described first control signal and described second control signal, to reduce described operating frequency, and ensure that described output voltage remains constant.
2. the control method of voltage-type regulator according to claim 1, is characterized in that, the generating step of described ripple signal comprises:
The node voltage of described voltage-type regulator of sampling;
Filtering is carried out to described node voltage, to obtain the first filtering voltage;
Filtering is carried out to described first filtering voltage, to obtain the second filtering voltage;
Described first filtering voltage and described second filtering voltage are carried out difference operation, to obtain a difference voltage;
Described difference voltage is multiplied with a proportionality coefficient, to obtain described ripple signal.
3. the control method of voltage-type regulator according to claim 1, is characterized in that, the rate-determining steps of described master power switch pipe comprises:
In each switch periods, when described first voltage signal is less than described lower limit reference voltage, master power switch pipe described in conducting;
When the first operating state, when the ON time of described master power switch pipe arrives a constant on-time of described Time constant characterization, turn off described master power switch pipe;
When the 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 regulator according to claim 3, is characterized in that, the ratio direct proportionality of described constant on-time and described output voltage and described input voltage.
5. the control method of voltage-type regulator according to claim 1, is characterized in that, the rate-determining steps of described master power switch pipe comprises:
In each switch periods, when described first voltage signal is greater than described upper limit reference voltage, turn off described master power switch pipe;
When the first operating state, when the turn-off time of described master power switch pipe arrives a constant off-time of described Time constant characterization, master power switch pipe described in conducting;
When the 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, master power switch pipe described in conducting.
6. the control method of voltage-type regulator according to claim 5, is characterized in that, the ratio direct proportionality of described constant off-time and the difference between described input voltage and described output voltage and described input voltage.
7. a control circuit for voltage-type regulator, in order to control a voltage-type regulator, to produce a constant output voltage at the output of described voltage-type regulator, it is characterized in that, comprise, first control circuit, Time constant circuit for generating, second control circuit, wherein
Described first control circuit, in order to compare the first voltage signal and the first reference voltage that receive, produces the first control signal;
The duty ratio same-phase of the master power switch pipe in described first voltage signal and described voltage-type regulator;
Described Time constant circuit for generating is in order to produce a Time constant signal according to the input voltage of described output voltage and described voltage-type regulator;
Described second control circuit, in order to compare described first voltage signal and the second reference voltage that receive, produces the second control signal;
When the first operating state, described Time constant signal and described second control signal control the on off state of the master power switch pipe of described voltage-type regulator;
When the second operating state, described first control signal and described second control signal control the on off state of described master power switch pipe.
8. the control circuit of voltage-type regulator according to claim 7, is characterized in that, also comprises ripple signal circuit for generating, and described ripple signal circuit for generating receives the node voltage of described voltage-type regulator, to produce described ripple signal; Described ripple signal superposes with the feedback signal characterizing described output voltage, to produce described first voltage signal.
9. the control circuit of voltage-type regulator according to claim 7, it is characterized in that, also comprise a logical circuit, described logical circuit receives described first control signal, described Time constant signal and described second control signal, to produce control signal to control the on off state of described master power switch pipe.
10. the control circuit of voltage-type regulator according to claim 7, is characterized in that, in each switch periods, when described first voltage signal is less than described second reference voltage, starts master power switch pipe described in conducting.
The control circuit of 11. voltage-type regulator according to claim 10, it is characterized in that, when the first operating state, described in described Time constant signal controlling, the ON time of master power switch pipe is a steady state value, the ratio direct proportionality of described ON time and described output voltage and described input voltage; After described ON time, turn off described master power switch pipe.
The control circuit of 12. voltage-type regulator according to claim 10, is characterized in that, when the second operating state, when described first voltage signal rises to described first reference voltage, turns off described master power switch pipe.
The control circuit of 13. voltage-type regulator according to claim 7, is characterized in that, in each switch periods, when described first voltage signal is greater than described second reference voltage, starts to turn off described master power switch pipe.
The control circuit of 14. voltage-type regulator according to claim 13, it is characterized in that, when the first operating state, the turn-off time of master power switch pipe described in described Time constant signal controlling is a steady state value, the ratio direct proportionality of described turn-off time and the difference between described input voltage and described output voltage and described input voltage; After the described turn-off time, master power switch pipe described in conducting.
The control circuit of 15. voltage-type regulator according to claim 13, is characterized in that, when the second operating state, when described first voltage signal drops to described first reference voltage, and master power switch pipe described in 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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| 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 |
| CN104079167A (en) * | 2014-07-07 | 2014-10-01 | 矽力杰半导体技术(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 |
| JP6592374B2 (en) * | 2016-02-23 | 2019-10-16 | エイブリック株式会社 | Switching regulator |
| CN107394998B (en) * | 2017-06-12 | 2020-04-17 | 矽力杰半导体技术(杭州)有限公司 | Control circuit, control method and switching power supply |
| US10523039B2 (en) * | 2017-08-11 | 2019-12-31 | Lion Semiconductor Inc. | Systems for battery charging using a wireless charging signal |
| 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 |
| CN108880237B (en) * | 2018-07-12 | 2020-10-30 | 矽力杰半导体技术(杭州)有限公司 | Switching time generation circuit of switching converter and switching time control method |
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| JPH02501884A (en) * | 1987-10-15 | 1990-06-21 | アスコム ハスレル エージー | Method and apparatus for preventing harmful effects of switching regulators (back cells) due to transient conditions |
| CN101783586B (en) * | 2009-01-19 | 2013-06-19 | 成都芯源系统有限公司 | Control circuit for constant on-time converting circuit and method thereof |
| TWI411213B (en) * | 2011-02-24 | 2013-10-01 | Richtek Technology Corp | Control circuit and method for a ripple regulator |
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