CN102684483A - Control circuit of switch-type adjuster and control method thereof - Google Patents
Control circuit of switch-type adjuster and control method thereof Download PDFInfo
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- CN102684483A CN102684483A CN2012101518042A CN201210151804A CN102684483A CN 102684483 A CN102684483 A CN 102684483A CN 2012101518042 A CN2012101518042 A CN 2012101518042A CN 201210151804 A CN201210151804 A CN 201210151804A CN 102684483 A CN102684483 A CN 102684483A
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Abstract
The invention provides a novel control circuit of a switch-type adjuster and a control method thereof. When the load jumping occurs on the switch-type adjuster, the control circuit generates a dynamic control signal to control the state of the switch-type adjuster, so that the output voltage can be quickly restored; and when no load jumping occurs on the switch-type adjuster, the control circuit generates a stable control signal to control the state of the switch-type adjuster so as to maintain the output voltage constant, so that the dynamic response performance of the switch-type adjuster is improved.
Description
Technical field
The present invention relates to electronic technology field, relate in particular to a kind of control circuit and control method thereof of switch type regulator.
Background technology
Switch type regulator is widely used in stable voltage source to various electric systems being provided in the prior art.(like laptop computer, mobile phone etc.) battery management especially needs high efficiency switch type regulator (for example, DC-DC converter) in the low power-supply device.Switch type regulator converts input direct voltage to high-frequency voltage, then high-frequency output voltage is carried out filtering and then converts VD to.Specifically, switch type regulator is made up of power stage circuit and control circuit two parts usually.The function of control circuit is when input voltage, inner parameter and external load change, and regulates the conducting and the turn-off time of the switching system in the power stage circuit, so that the output voltage of switch type regulator or output current maintenance are constant.Therefore, in the design of switch type regulator, the selection of control circuit or control method and design are crucial for the performance of switch type regulator.Adopt different detection signal and Different control circuit to have the Different control effect.
In the prior art, the control mode of switch type regulator has a variety of, and frequency control and VFC are decided in basic comprising.Fixed control frequently is that switch periods is invariable, regulates output voltage, i.e. pulse width modulation (PWM) through the width of switch conduction in the adjustment one-period.VFC has constant ON time, constant turn-off time and sluggishness several kinds of control modes such as relatively to control.
But; When the load generation saltus step of switch type regulator, become heavy duty like load by underloading, perhaps become underloading by heavy duty; For the control mode of existing switch type regulator; Because control circuit needs an error amplifier to amplify the sampled value of main circuit output voltage and the error between the reference voltage level usually, circuit structure is complicated, needs suitable compensating network to guarantee the stability of system; And dynamic response performance is owing to receive the restriction of system bandwidth, and response speed is slower, needs long recovery time.
With reference to figure 1, be depicted as the working waveform figure of a kind of switch type regulator when load generation saltus step that adopts prior art.Thus it is clear that, at t
1Constantly, load moment of switch type regulator becomes heavy duty by underloading, output current I
OutMoment is by I
1Increase to I
2At this moment, still the on off state of switch type regulator is regulated inductive current I for pwm control signal
LSlowly rise output voltage V
OutAfter recovery time, at t through one period long period
2Constantly slowly return to normal value.
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 switch type regulator.
According to the control circuit and the control method of switch type regulator of the present invention, the real-time detection through to output voltage has not only realized the judgement to the load transitional states; And; When the load saltus step takes place; Through the control signal of the stronger dynamic control signal replacement lower state of another regulating effect, control the on off state of said switch type regulator, thereby make the output voltage of switch type regulator can return to desired value fast.
Control circuit according to the switch type regulator of one embodiment of the invention comprises, load saltus step decision circuitry, and Steady-State Control signal generating circuit and dynamic control signal generation circuit, wherein,
Said load saltus step decision circuitry is in order to judge the load transitional states according to the output voltage of detected said switch type regulator and the relation between the first voltage preset value and the second voltage preset value; When the load saltus step takes place, produce a skip signal;
Said Steady-State Control signal generating circuit produces a Steady-State Control signal in order to the desired output voltage according to said output voltage and said switch type regulator;
Said dynamic control signal generation circuit is in order to produce a dynamic control signal according to said output voltage;
When said switch type regulator generation load saltus step, said dynamic control signal is controlled the state of said switch type regulator, so that the fast quick-recovery of said output voltage;
When the load saltus step does not take place in said switch type regulator, the state of the said switch type regulator of said Steady-State Control signal controlling, it is constant to keep said output voltage.
Further; Said load saltus step decision circuitry comprises first comparator and second comparator; Two inputs of said first comparator receive said output voltage and the said first voltage preset value respectively; When said output voltage during less than the said first voltage preset value, the saltus step of said switch type regulator generation reverse load;
Two inputs of said second comparator receive said output voltage and the said second voltage preset value respectively, when said output voltage during greater than the said second voltage preset value, and said switch type regulator generation forward load saltus step.
Further, said dynamic control signal generation circuit comprises the valley decision circuitry, in order to receive said output voltage, when said output voltage arrives valley, to produce a valley signal;
Said dynamic control signal generation circuit also comprises the peak value decision circuitry, in order to receiving said output voltage, to produce a peak signal during to peaking at said output voltage.
Said dynamic control signal generation circuit also comprises a logical circuit, in order to produce said dynamic control signal according to the said skip signal that receives and said valley signal or said peak signal; The effective status interval of said dynamic control signal is initial moment of effective status of the initial moment to said valley signal or said peak signal of the effective status of said skip signal.
Control method according to a kind of switch type regulator of one embodiment of the invention may further comprise the steps:
Step 1: the output voltage that detects said switch type regulator;
Step 2: the load condition of judging said switch type regulator according to the relation between said output voltage and the first voltage preset value and the second voltage preset value; When said switch type regulator generation load saltus step, produce a skip signal;
Step 3-1: when said switch type regulator is in lower state, utilize the state of the said switch type regulator of a Steady-State Control signal controlling, so that the output voltage of said switch type regulator is kept substantially constant;
Step 3-2: when said switch type regulator generation load saltus step, utilize a dynamic control signal to control the state of said switch type regulator, so that the fast quick-recovery of the output voltage of said switch type regulator.
Further, said step 2 may further comprise the steps:
More said output voltage and the said first voltage preset value;
When said output voltage during less than the said first voltage preset value, the saltus step of said switch type regulator generation reverse load;
More said output voltage and the said second voltage preset value;
When said output voltage during greater than the said second voltage preset value, said switch type regulator generation forward load saltus step;
When said output voltage greater than the said first voltage preset value during less than the said second voltage preset value, said switch type regulator is in lower state.
Further, the generation step of dynamic control signal comprises:
Detect said output voltage, and judge whether output voltage arrives valley or peak value;
When said output voltage arrives valley, produce a valley signal;
According to said valley signal and said skip signal, produce said dynamic control signal;
The valid interval of said dynamic control signal is the initial moment of the initial moment of said skip signal effective status to the effective status of said valley signal;
When said output voltage during, produce a peak signal to peaking;
According to said peak signal and said skip signal, produce said dynamic control signal;
The valid interval of said dynamic control signal is the initial moment of the initial moment of said skip signal effective status to the effective status of said peak signal.
Further, the generation step of dynamic control signal also comprises:
Convert said output voltage into digital output voltage;
Compare current digit output voltage and the first voltage preset value and the second voltage preset value;
Judge that whether the current digit output voltage is less than the first voltage pre-set limit;
If the current digit output voltage is less than the first voltage pre-set limit, said dynamic control signal becomes effective status by disarmed state;
Otherwise, continue to detect the current digit output voltage;
Judge that whether the current digit output voltage is greater than the last digit output voltage;
If the current digit output voltage is greater than the last digit output voltage, counter adds one;
If the current digit output voltage is less than last digit output voltage, counter O reset;
Whether the numerical value of judging counter arrives a preset value;
When the numerical value of counter reached a preset value, said dynamic control signal became disarmed state by effective status;
Otherwise, continue relatively current digit output voltage and last digit output voltage;
Judge that whether the current digit output voltage is greater than the second voltage pre-set limit;
If the current digit output voltage is greater than the second voltage pre-set limit, said dynamic control signal becomes effective status by disarmed state;
Otherwise, continue relatively the current digit output voltage and the second voltage pre-set limit;
Compare current digit output voltage and last digit output voltage;
If the current digit output voltage is less than the last digit output voltage, counter adds one;
If the current digit output voltage is greater than last digit output voltage, counter O reset;
Whether the numerical value of judging counter arrives a preset value;
If the numerical value of counter is during greater than a preset value, said dynamic control signal becomes disarmed state by effective status;
Otherwise, the lasting numerical value of judging counter.
Control circuit and control method according to switch type regulator of the present invention; Do not need complicated sample circuit, logic and sequential; Only through detection and judgement to output voltage; And according to the variation tendency and the amplitude of detected output voltage; The switch motion of the switch type regulator when producing the strong dynamic control signal of the more common pwm control signal of a regulating effect and coming the control load saltus step, thus make the output voltage of switch type regulator return to desired value fast, significantly improved the dynamic responding speed of switch type regulator.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is embodiments of the invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to the accompanying drawing that provides.
The working waveform figure of a kind of switch type regulator when the load saltus step takes place for adopting prior art shown in Figure 1;
Shown in Figure 2 is theory diagram according to the control circuit of a kind of switch type regulator of first embodiment of the invention;
Fig. 3 A is depicted as the theory diagram according to the dynamic control signal generation circuit in the control circuit of a kind of switch type regulator of second embodiment of the invention;
Fig. 3 B is depicted as the first state working waveform figure according to the dynamic control signal generation circuit in the control circuit of a kind of switch type regulator of second embodiment of the invention shown in Fig. 3 A;
Fig. 3 C is depicted as the second state working waveform figure according to the dynamic control signal generation circuit in the control circuit of a kind of switch type regulator of second embodiment of the invention shown in Fig. 3 A;
Shown in Figure 4 is theory diagram according to the valley decision circuitry in the dynamic control signal generation circuit of one embodiment of the invention;
Shown in Figure 5 is theory diagram according to the peak value decision circuitry in the dynamic control signal generation circuit of one embodiment of the invention;
Shown in Figure 6 is theory diagram according to the logical circuit in the dynamic control signal generation circuit of one embodiment of the invention;
Shown in Figure 7 is flow chart according to the control method of a kind of switch type regulator of one embodiment of the invention;
Shown in Figure 8 is flow chart according to the production method of the dynamic control signal in the control method of the switch type regulator of the first embodiment of the present invention;
Shown in Figure 9 is flow chart according to the digital production method of the dynamic control signal in the control method of the switch type regulator of embodiments of the invention.
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 contain any on marrow of the present invention and scope, make substitute, modification, equivalent method and scheme.Understand for the public is had completely the present invention, in the following preferred embodiment of the present invention, specified concrete details, and do not had 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 theory diagram according to the control circuit of a kind of switch type regulator of first embodiment of the invention.In this embodiment, adopting the voltage-dropping type topological structures with the power stage circuit of switch type regulator 204 is that example describes, and power stage circuit 204 comprises power switch tube S
0, rectifier diode D
0, outputting inductance L
0With output capacitance C
0, its connected mode is identical with prior art with operation principle, repeats no more at this.The control circuit of foundation switch type regulator of the present invention shown in Figure 2 comprises load saltus step decision circuitry 201, Steady-State Control signal generating circuit 202 and dynamic control signal generation circuit 203; Wherein,
Said load saltus step decision circuitry 201 receives the output voltage V of said power stage circuit 204
OutWhen saltus step took place in the load 205 of switch type regulator, said load saltus step decision circuitry 201 produced a skip signal S
Load
Further, said load saltus step decision circuitry 201 comprises first comparator and second comparator; Two inputs of said first comparator receive the said output voltage and the first voltage preset value respectively, and when said output voltage during less than the said first voltage preset value, the saltus step of said switch type regulator generation reverse load produces the first saltus step sub-signal S
Load1Two inputs of said second comparator receive the said output voltage and the second voltage preset value respectively, and when said output voltage during greater than the said second voltage preset value, said switch type regulator generation forward load saltus step produces the second saltus step sub-signal S
Load2The first saltus step sub-signal S
Load1With the second saltus step sub-signal S
Load2Characterize the different saltus steps of load, both are jointly as skip signal S
LoadWhen said output voltage greater than the first voltage preset value during less than the second voltage preset value, said switch type regulator is in the steady operation state.Here, said first preset value can be chosen as said switching mode converter desired output voltage 90%-95%.Said first preset value can be chosen as said switching mode converter desired output voltage 105%-110%.
Said Steady-State Control signal generating circuit 202 is connected with said load saltus step decision circuitry 201, to receive said skip signal S
Load, output voltage V
OutWith a reference voltage V
RefWhen the load saltus step does not take place in said load 204, i.e. skip signal S
LoadWhen invalid, said Steady-State Control signal generating circuit 202 is according to said output voltage V
OutWith said reference voltage V
Ref, produce a Steady-State Control signal V
Ctrl_sControl the on off state of said power stage circuit 204, to guarantee the output voltage V of said power stage circuit 204
OutWith said reference voltage V
RefEquate.
Said dynamic control signal generation circuit 203 is connected with said load saltus step decision circuitry 201, searches said skip signal S to connect
LoadWith the electric V of output
OutWhen the load saltus steps take place in said load 206, i.e. skip signal S
LoadIn the time of effectively, said dynamic control signal generation circuit 203 is according to said output voltage V
OutProduce a dynamic control signal V
Ctrl_tControl the on off state of said power stage circuit 204, so that the output voltage V of said power stage circuit 204
OutReturn to said reference voltage V fast
RefAt this moment, said Steady-State Control signal V
Ctrl_s Power stage circuit 204 is not regulated control.
The control circuit of switch type regulator shown in Figure 2 can also comprise selects circuit 206, and it receives skip signal S respectively
Load, Steady-State Control signal V
Ctrl_sWith dynamic control signal V
Ctrl_tAs said skip signal S
LoadWhen invalid, Steady-State Control signal V
Ctrl_sBe passed to power stage circuit 204; As said skip signal S
LoadIn the time of effectively, dynamic control signal V
Ctrl_tBe passed to power stage circuit 204.Those skilled in the art can learn that said selection circuit can be the circuit of any suitable form, as comprises by said skip signal S
LoadControl first switch S 1 and by said skip signal S
LoadNon-signal
The second switch S2 of control.Said Steady-State Control signal generating circuit 202 can be pwm control circuit, constant time control circuit or any appropriate control circuit; Said power stage circuit 204 can be voltage-dropping type, booster type, the topological structure of buck-boost type or any suitable form.
It is thus clear that; Adopt the control circuit of switch type regulator according to one embodiment of the invention shown in Figure 2; Through detection and judgement to output voltage; And according to the variation tendency and the amplitude of detected output voltage; The switch motion of the switch type regulator when producing the strong dynamic control signal of the more common pwm control signal of a regulating effect and coming the control load saltus step, thus make the output voltage of switch type regulator return to desired value fast, significantly improved the dynamic responding speed of switch type regulator.
With reference to figure 3A, be depicted as theory diagram according to the dynamic control signal generation circuit of one embodiment of the invention.In this embodiment, said dynamic control signal generation circuit comprises valley decision circuitry 30l, a peak value decision circuitry 302 and a logical circuit 303.Wherein,
Valley decision circuitry 30l comprises first output voltage sampling circuit, 304, the first capacitance voltage holding circuits 305 and first comparison circuit 306;
Peak value decision circuitry 302 comprises second output voltage sampling circuit, 307, the second capacitance voltage holding circuits 308 and second comparison circuit 309.
In the course of the work, the output voltage V of first output voltage sampling circuit, 304 receiving key type adjusters
Out, characterize said output voltage V to obtain one
OutOn the occasion of the first sampled voltage V
SamplelThe first capacitance voltage holding circuit 305 receives the first sampled voltage V then
Sample1With skip signal S
Load(like the first saltus step sub-signal S
Load1), as skip signal S
LoadIn the time of effectively, the said first sampled voltage V
Sample1Electric capacity in the said capacitance voltage holding circuit 305 charges; As said skip signal S
LoadWhen invalid, the electric capacity in the said capacitance voltage holding circuit 305 discharges, and produces the first capacitance voltage V with first end at said electric capacity
C1At skip signal S
LoadIn the effective status interval, the first capacitance voltage V
C1Follow the first sampled voltage V
Sample1Therefore, because electric capacity is to the maintenance effect of voltage, as the first sampled voltage V
Sample1After arriving valley, the first capacitance voltage V
C1Will be greater than the first sampled voltage V
Sample1Thereby, detected the first sampled voltage V
Sample1Valley, i.e. output voltage V
OutValley;
First comparison circuit 306 receives the first capacitance voltage V respectively
C1With the first sampled voltage V
Sample1, arrive the first sampled voltage V
Sample1Valley after, the output of first comparison circuit 306 produces valley signal V through an inverter
Valley
Based on essentially identical operation principle, the output voltage V of second output voltage sampling circuit, 307 receiving key type adjusters
Out, characterize said output voltage V to obtain one
OutThe second sampled voltage V
Sample2The second capacitance voltage holding circuit 308 receives the second sampled voltage V then
Sample1With skip signal S
Load(like the second skip signal S
Load2), as skip signal S
LoadIn the time of effectively, the said second sampled voltage V
Sample2Electric capacity in the said capacitance voltage holding circuit 308 charges; As said skip signal S
LoadWhen invalid, the electric capacity in the capacitance voltage holding circuit 308 discharges, and produces the second capacitance voltage V with first end at said electric capacity
C2At skip signal S
LoadIn the effective status interval, the second capacitance voltage V
C2Follow the first sampled voltage V
Sample2Therefore, because electric capacity is to the maintenance effect of voltage, as the second sampled voltage V
Sample2Behind peaking, the second capacitance voltage V
C2Will be greater than the second sampled voltage V
Sample2Thereby, detected the second sampled voltage V
Sample2Peak value, i.e. output voltage V
OutPeak value;
Second comparison circuit 309 receives the second capacitance voltage V respectively
C2With the second sampled voltage V
Sample2, arrive the second sampled voltage V
Sample2Peak value after, the output of second comparison circuit 306 is as peak signal V
Peak
Below in conjunction with the second state working waveform figure of the dynamic control signal generation circuit in the control circuit of the first state working waveform figure of the dynamic control signal generation circuit in the control circuit of the switch type regulator shown in Fig. 3 B and the switch type regulator shown in Fig. 3 C, specify the operation principle of the switch type regulator that adopts the dynamic control signal generation circuit shown in Fig. 3 A.
In Fig. 3 B, switch type regulator load on t
0Constantly become heavy duty, the reverse load saltus step promptly takes place, output current I by underloading
OutMoment is by I
1Rise to I
2Output voltage V
OutBegin to descend, when at t
1Constantly, output voltage V
OutDrop to the first voltage preset value V
Th1The time, skip signal S
Load(the first saltus step sub-signal S
Load1) become low level by high level, dynamic control signal V
Ctrl_tBecome high level by low level, inductive current I
LBegin to rise; At this moment, Steady-State Control signal V
Ctrl_sBe failure to actuate; Judge output voltage V then
OutWhen arrive valley; At t
2Constantly, output voltage V
OutReach valley, at this moment, valley signal V
ValleyBecome high level by low level; While dynamic control signal V
Ctrl_tBecome low level by high level; Steady-State Control signal V
Ctrl_sBegin action, output voltage V
OutContinue to rise; At t
3Constantly, output voltage V
OutRise to the first voltage preset value V
Th1, skip signal S
LoadBecome high level by low level; While valley signal V
ValleyBecome low level by high level.The operating state of switch type regulator is by dynamically transferring stable state to.
In Fig. 3 C, switch type regulator load on t
4Constantly become underloading, forward load saltus step promptly takes place, output current I by heavy duty
OutMoment is by I
3Drop to I
4Output voltage V
OutBegin to rise, when at t
5Constantly, output voltage V
OutRise to the second voltage preset value V
Th2The time, skip signal S
Load(the first saltus step sub-signal S
Load1) become low level by high level, dynamic control signal V
CtrltBecome high level by low level, inductive current I
LBegin to descend; At this moment, Steady-State Control signal V
Ctrl_sBe failure to actuate; Judge output voltage V then
OutWhen arrive peaking; At t
6Constantly, output voltage V
OutReach peak value, at this moment, peak signal V
PeakBecome high level by low level; While dynamic control signal V
Ctrl_tBecome low level by high level; Steady-State Control signal V
Ctrl_sBegin action, output voltage V
OutContinue to descend; At t
7Constantly, output voltage V
OutDrop to the second voltage preset value V
Th2, skip signal S
LoadBecome high level by low level; While peak signal V
PeakBecome low level by high level.The operating state of switch type regulator is by dynamically transferring stable state to.
Can find out from Fig. 3 B and Fig. 3 C; Adopt control circuit, when the load saltus step takes place, compared to the switch type regulator of prior art according to switch type regulator of the present invention; The maximum rate of change of output voltage will reduce about 30%, and dynamic response time will reduce about 50%; The voltage transformation rate reduce the load saltus step make to take place the time, can not produce overshoot voltage, avoid damaging the circuit elements device, improved the stability of switch type regulator greatly, and the dynamic corresponding performance.
Below in conjunction with specific embodiment, specify implementation according to valley decision circuitry, peak value decision circuitry and logical circuit in the dynamic control signal generation circuit of the present invention.
With reference to figure 4, be depicted as theory diagram according to the peak value decision circuitry in the dynamic control signal generation circuit of one embodiment of the invention.In this embodiment, second output voltage sampling circuit resistor voltage divider circuit that the resistance R that is connected in series 1 and resistance R 2 are formed of serving as reasons, it receives output voltage V
OutPoints of common connection A place with in resistance R 1 and resistance R 2 produces the second sampled voltage V
Sample2
Capacitor C
HoldCharging operations by being connected in series in capacitor C
HoldThe switch S 3 and diode D1 control of first end, the switch motion of switch S 3 is by skip signal S
Load(the second saltus step sub-signal S
Load2) control; With skip signal S
LoadLow level effectively is an example, skip signal S
LoadState through inverter IV1 control switch S3; Capacitor C
HoldCharging operations by the switch S that is connected in parallel with it 4 control; Here, skip signal S
LoadThe state of direct control switch S4;
The in-phase input end of comparator C MP2 is connected to capacitor C
HoldFirst end, inverting input receives the second sampled voltage V
Sample2, the output signal of output is as peak signal V
Peak
Specify the operation principle of the peak value decision circuitry shown in Fig. 4 below in conjunction with the working waveform figure of the foundation dynamic control signal generation of the present invention circuit shown in Fig. 3 C.
In the course of the work, when reverse saltus step takes place in load, i.e. skip signal S
LoadBe low level when effective, switch S 4 is broken off, this moment switch S 3 closures, the second sampled voltage V
Sample2Through diode D1 and 3 pairs of capacitor C of switch S
HoldCharge capacitor C
HoldThe second capacitance voltage V at the first end B point place
C2Follow the second sampled voltage V
Sample2
In output voltage V
OutWhen the peaking, because electric capacity is to the maintenance effect of voltage, and the clamping action of diode, make the second capacitance voltage V at B point place
C2Remain a peak value, and input to the in-phase input end of comparator C MP2; And the input signal V of the inverting input of comparator C MP2
Sample2Follow output voltage, therefore, at time interval t
6-t
7In, the second sampled voltage V
Sample2Less than the second capacitance voltage V
C2, the output signal of comparator C MP2 remains high level in this time interval; As skip signal S
LoadAt t
7When constantly becoming high level, switch S 3 is broken off switch S 4 closures, capacitor C
HoldThrough switch S 4 discharges, the second sampled voltage V
Sample2Greater than the second capacitance voltage V
C2, peak signal V
PeakBecome low level by high level.
Those skilled in the art are according to instruction of the present invention; Based on identical inventive principle; Can learn that peak value decision circuitry of the present invention is not limited to specific embodiment shown in Figure 4, the peak value decision circuitry of any suitable form is all applicable to switch type regulator of the present invention.
With reference to figure 5, be depicted as theory diagram according to the valley decision circuitry in the dynamic control signal generation circuit of one embodiment of the invention.In this embodiment, first output voltage sampling circuit comprises an operational amplification circuit, with the output voltage V with variation on a declining curve
OutConvert the first sampled voltage V of corresponding variation in rising trend into
Sample1Said operational amplification circuit comprises operational amplifier EA1; Resistance R 5 is connected in series in a voltage source V with resistance R 6
Ref1And between the ground, the points of common connection C of resistance R 5 and resistance R 6 is connected to the in-phase input end of operational amplifier EA1; Resistance R 7 is connected in series in output voltage V with resistance R 8
OutAnd between the output of operational amplifier EA1, the points of common connection D of resistance R 7 and resistance R 8 is connected to the inverting input of operational amplifier EA1.
Capacitor C
Hold1Charging operations by being connected in series in capacitor C
Hold1Switch T1 and the diode D2 control of first end, the switch motion of switch T1 is by skip signal S
Load(the first saltus step sub-signal S
Load1) control; With skip signal S
LoadLow level effectively is an example, skip signal S
LoadState through inverter IV2 control switch T1; Capacitor C
Hold1Charging operations by the switch T2 that is connected in parallel with it control; Here, skip signal S
LoadThe state of direct control switch T2;
The in-phase input end of comparator C MP3 is connected to capacitor C
Hold1First end, inverting input receives the first sampled voltage V
Sample1, the output signal of output is with as valley signal V
Valley
Specify the operation principle of the valley decision circuitry shown in Fig. 5 below in conjunction with the working waveform figure of the foundation dynamic control signal generation of the present invention circuit shown in Fig. 3 B.
In the course of the work, when reverse saltus step takes place in load, i.e. skip signal S
LoadBe low level when effective, switch T2 breaks off, and this moment, switch T1 was closed, the first sampled voltage V
Sample1Through diode D2 and switch T1 to capacitor C
Hold1Charge capacitor C
Hold1The first capacitance voltage V at the first end E point place
C1Follow the first sampled voltage V
Sample1
In output voltage V
OutWhen arriving valley, because electric capacity is to the maintenance effect of voltage, and the clamping action of diode, make the first capacitance voltage V at E point place
C1Remain the peak value of a correspondence, and input to the in-phase input end of comparator C MP3; And the input signal V of the inverting input of comparator C MP3
Sample1Follow output voltage, therefore, at time interval t
3-t
4In, the first sampled voltage V
Sample1Less than the first capacitance voltage V
C1, the output signal of comparator C MP3 remains high level in this time interval; As skip signal S
LoadAt t
4When constantly becoming high level, switch T1 breaks off, and switch T2 is closed, capacitor C
Hold1Through switch T2 discharge, the first sampled voltage V
Sample1Greater than the first capacitance voltage V
C1, valley signal V
ValleyBecome low level by high level.
Those skilled in the art are according to instruction of the present invention; Based on identical inventive principle; Can learn that valley decision circuitry of the present invention is not limited to specific embodiment shown in Figure 5, the valley decision circuitry of any suitable form is all applicable to switch type regulator of the present invention.
With reference to figure 6, be depicted as theory diagram according to the logical circuit in the dynamic control signal generation circuit of one embodiment of the invention.In this embodiment, logical circuit comprises skip signal receiving circuit 607, peak value and valley signal receiving circuit 608 and logical circuit 606; Wherein,
Skip signal receiving circuit 607 comprises or door 601, inverter 602 and pulse generation circuit 603; Or two inputs of door 601 receive the first saltus step sub-signal S
Load1With the second saltus step sub-signal S
Load2
Peak value and valley signal receiving circuit 608 comprise or door 604 and pulse generation circuit 605; Or two inputs of door 604 receive peak signal V respectively
PeakWith valley signal V
Valley
Logical circuit comprises a rest-set flip-flop 606, and its set end is connected to pulse generation circuit 603, and reset terminal is connected to pulse generation circuit 605;
Effectively example when being low level with the skip signal; When skip signal is effective; Set end through inverter 602 and pulse generation circuit 603 set rest-set flip-flops 606; Output Q becomes high level by low level, and continues to the initial moment of the effective status of peak signal or valley signal always; Peak signal or valley signal are through pulse generation circuit 605 rest-set flip-flop 606 that resets, and output Q becomes low level by high level, thereby obtain dynamic control signal V at output Q
Ctrl_t
Those skilled in the art based on identical inventive principle, can learn that logical circuit of the present invention is not limited to specific embodiment shown in Figure 6 according to instruction of the present invention, and the logic of any suitable form is all applicable to switch type regulator of the present invention.In this embodiment, peak signal and valley signal common one logical circuit, but equally also can utilize a logical circuit respectively.
And; The control circuit of switch type regulator of the present invention is not limited to above-mentioned logic and sequential relationship; Effective status like skip signal can be high level etc., and those skilled in the art can learn, concern for different logical; Only need accordingly to the peak value decision circuitry, valley decision circuitry and logical circuit are changed accordingly and are got final product.
Below introduced Realization of Analog Circuit mode in detail according to the control circuit of the switch type regulator of inventive principle of the present invention; Those skilled in the art can learn; According to instruction of the present invention, can realize the present invention equally based on the digital circuit implementation of same principle.As the foundation dynamic control signal generation of the present invention circuit that adopts digital circuit to realize can comprise parts such as analog to digital converter and digital processing unit.Analog to digital converter receives output voltage and is converted into digital output voltage, and the processing through digital processing unit produces dynamic control signal then.
Specify control method below in conjunction with specific embodiment according to switch type regulator of the present invention.
With reference to figure 7, be depicted as flow chart according to the control method of the switch type regulator of one embodiment of the invention.In this embodiment, the control method of switch type regulator may further comprise the steps:
S701: the output voltage of sense switch type adjuster;
S702:, judge whether said switch type regulator the load saltus step takes place according to said output voltage and the first voltage preset value and the second voltage preset value; When said switch type regulator generation load saltus step, produce a skip signal;
Its deterministic process can be following steps:
The more said output voltage and the first voltage preset value;
When said output voltage during less than the said first voltage preset value, the saltus step of said switch type regulator generation reverse load;
The more said output voltage and the second voltage preset value;
When said output voltage during greater than the said second voltage preset value, said switch type regulator generation forward load saltus step;
When said output voltage greater than the said first voltage preset value during less than the said second voltage preset value, said switch type regulator is in lower state.
S703-1: when said switch type regulator is in lower state, utilize the state of the said switch type regulator of a Steady-State Control signal controlling, so that the output voltage of said switch type regulator is kept substantially constant;
S703-2: when said switch type regulator generation load saltus step, utilize a dynamic control signal to control the state of said switch type regulator, so that the fast quick-recovery of the output voltage of said switch type regulator.
Wherein, the step of generation Steady-State Control signal comprises:
Produce said Steady-State Control signal according to the error between the desired output voltage of said output voltage and said switch type regulator.
Said Steady-State Control signal can be pwm control signal.
Wherein, the step that produces dynamic control signal is as shown in Figure 8, and it may further comprise the steps:
S801: the output voltage of sense switch type adjuster, and judge whether output voltage reaches valley or peak value;
S802: when said output voltage arrives valley, produce a valley signal;
S803:, produce said dynamic control signal according to said valley signal and said skip signal;
The valid interval of said dynamic control signal is the initial moment of the initial moment of said skip signal effective status to the effective status of said valley signal;
S804:, produce a peak signal when said output voltage during to peaking;
S805:, produce said dynamic control signal according to said peak signal and said skip signal;
The valid interval of said dynamic control signal is the initial moment of the initial moment of said skip signal effective status to the effective status of said peak signal.
Further, the generation step of said dynamic control signal also comprises:
The initial moment at the effective status of said skip signal produces first single pulse signal;
The initial moment at the effective status of said peak signal or valley signal produces second single pulse signal;
The set termination of one rest-set flip-flop is received said first single pulse signal, and reset terminal receives said second single pulse signal, and the output signal of said rest-set flip-flop is as said dynamic control signal.
Further, the generation step of said valley signal comprises:
The said output voltage of sampling, with produce one on the occasion of sampled voltage;
When said skip signal is effective, utilize said sampled voltage that one electric capacity is charged;
When said skip signal was invalid, said electric capacity discharged, and produced a capacitance voltage with first end at said electric capacity;
More said capacitance voltage and said sampled voltage, comparative result is as said valley signal.
Further, the generation step of said peak signal comprises:
The said output voltage of sampling is to produce a sampled voltage;
When said skip signal is effective, utilize said sampled voltage that one electric capacity is charged;
When said skip signal was invalid, said electric capacity discharged, and produced a capacitance voltage with first end at said electric capacity;
More said capacitance voltage and said sampled voltage, comparative result is as said peak signal.
With reference to figure 9, be depicted as Digital Implementation method flow diagram according to the dynamic control signal generation circuit in the switch type regulator of the present invention, it may further comprise the steps:
S901: convert said output voltage into digital output voltage;
S902: compare current digit output voltage and the first voltage preset value and the second voltage preset value;
S903: judge that whether the current digit output voltage is less than the first voltage pre-set limit;
S904: if the current digit output voltage less than the first voltage pre-set limit, said dynamic control signal becomes effective status by disarmed state;
For example can be for becoming low level signal by high level signal;
Otherwise, continue to detect the current digit output voltage;
S905: judge that whether the current digit output voltage is greater than the last digit output voltage;
S906: if the current digit output voltage greater than the last digit output voltage, counter adds one;
S907: if the current digit output voltage is less than last digit output voltage, counter O reset;
S908: whether the numerical value of judging counter arrives a preset value;
S909: when the numerical value of counter reached a preset value, said dynamic control signal became disarmed state by effective status;
For example can become high level signal by low level signal;
Otherwise, continue relatively current digit output voltage and last digit output voltage;
S910: judge that whether the current digit output voltage is greater than the second voltage pre-set limit;
S911: if the current digit output voltage greater than the second voltage pre-set limit, said dynamic control signal becomes effective status by disarmed state;
For example can be for becoming low level signal by high level signal;
Otherwise, continue relatively the current digit output voltage and the second voltage pre-set limit;
S912: compare current digit output voltage and last digit output voltage;
S913: if the current digit output voltage less than the last digit output voltage, counter adds one;
S914: if the current digit output voltage is greater than last digit output voltage, counter O reset;
S915: whether the numerical value of judging counter arrives a preset value;
S916: if the numerical value of counter during greater than a preset value, said dynamic control signal becomes disarmed state by effective status;
For example can be for becoming high level signal by low level signal;
Otherwise, the lasting numerical value of judging counter.
Wherein, said preset value can be 3 or other suitable numerical value, guarantees fully to detect valley or peak value, avoids erroneous detection.
Those skilled in the art can learn, according to instruction of the present invention, can realize the present invention equally based on other suitable digital control methods of basic principle of the present invention.
In sum; More than control circuit and control method according to the switch type regulator of embodiments of the invention have been carried out detailed description, those of ordinary skills can know other technologies or structure and circuit layout, element etc. in view of the above by inference and all can be applicable to said embodiment.The Steady-State Control signal can be pwm control signal or other appropriate control signals, like constant time control signal etc.; Sequential relationship and logical relation can be not limited to embodiments of the invention, and any suitable logical relation all goes for the present invention.Logical circuit or capacitance voltage holding circuit can come to supply respectively peak signal or the utilization of valley signal for two circuit independently, perhaps merge into a single circuit and supply peak signal or valley signal common.
Identical similar part is mutually referring to getting final product between each embodiment in this specification, and each embodiment stresses all is the difference with other embodiment.Can realize the purpose of present embodiment scheme according to the needs selection some or all of module wherein of reality.Those of ordinary skills promptly can understand and implement under the situation of not paying creative work.
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 are merely described specific embodiment.Obviously, according to above description, can do a lot of modifications and variation.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 person skilled can utilize the present invention and the modification on basis of the present invention to use well under making.The present invention only receives the restriction of claims and four corner and equivalent.
Claims (10)
1. the control circuit of a switch type regulator is applied to it is characterized in that in the switch type regulator, comprises load saltus step decision circuitry, Steady-State Control signal generating circuit and dynamic control signal generation circuit, wherein,
Said load saltus step decision circuitry is in order to judge the load transitional states according to the output voltage of detected said switch type regulator and the relation between the first voltage preset value and the second voltage preset value;
When said output voltage less than the said first voltage preset value or when said output voltage during greater than the said second voltage preset value, said switch type regulator generation load saltus step is to produce a skip signal;
Said Steady-State Control signal generating circuit produces a Steady-State Control signal in order to the desired output voltage according to said output voltage and said switch type regulator;
Said dynamic control signal generation circuit is in order to produce a dynamic control signal according to said output voltage;
When said switch type regulator generation load saltus step, said dynamic control signal is controlled the state of said switch type regulator, so that the fast quick-recovery of said output voltage;
When the load saltus step does not take place in said switch type regulator, the state of the said switch type regulator of said Steady-State Control signal controlling, it is constant to keep said output voltage.
2. control circuit according to claim 1 is characterized in that, said dynamic control signal generation circuit comprises the valley decision circuitry, in order to receive said output voltage, when said output voltage arrives valley, to produce a valley signal; Said dynamic control signal generation circuit also comprises the peak value decision circuitry, in order to receiving said output voltage, to produce a peak signal during to peaking at said output voltage.
3. control circuit according to claim 2; It is characterized in that; Said dynamic control signal generation circuit also comprises a logical circuit, in order to produce said dynamic control signal according to the said skip signal that receives and said valley signal or said peak signal; The effective status interval of said dynamic control signal is initial moment of effective status of the initial moment to said valley signal or said peak signal of the effective status of said skip signal.
4. control circuit according to claim 2 is characterized in that, said valley decision circuitry comprises first sample circuit, the first capacitance voltage holding circuit and first comparison circuit; Wherein,
Said first sample circuit is in order to the said output voltage of sampling, and is converted into a positive sampled voltage;
The said first capacitance voltage holding circuit is in order to receive said sampled voltage and said skip signal, and when said skip signal was effective, said sampled voltage charged to the electric capacity in the said capacitance voltage holding circuit; When said skip signal was invalid, the electric capacity in the said capacitance voltage holding circuit discharged, and produced a capacitance voltage with first end at said electric capacity;
Said comparison circuit receives said capacitance voltage and said sampled voltage respectively, and the output of said comparison circuit produces said valley signal through an inverter.
Said peak value decision circuitry comprises second sample circuit, the second capacitance voltage holding circuit and second comparison circuit; Wherein,
Said second sample circuit is in order to the said output voltage of sampling, and is converted into a sampled voltage;
The said second capacitance voltage holding circuit is in order to receive said sampled voltage and said skip signal, and when said skip signal was effective, said sampled voltage charged to the electric capacity in the said capacitance voltage holding circuit; When said skip signal was invalid, the electric capacity in the said capacitance voltage holding circuit discharged, and produced a capacitance voltage with first end at said electric capacity;
Said comparison circuit receives said capacitance voltage and said sampled voltage respectively, and the output of said comparison circuit is as said peak signal.
5. control circuit according to claim 1 is characterized in that, said dynamic control signal generation circuit comprises an analog to digital converter and a digital processing unit, wherein,
Said analog to digital converter is in order to convert the output voltage that receives into one digital output voltage;
Said digital processing unit receives said digital output voltage, with when said digital output voltage arrives valley or peak value, produces said dynamic control signal.
6. control circuit according to claim 1 is characterized in that, said switch type regulator is a voltage-dropping type, and booster type perhaps boosts-the voltage-dropping type topological structure.
7. the control method of a switch type regulator is characterized in that, may further comprise the steps:
Step 1: the output voltage that detects said switch type regulator;
Step 2: the load condition of judging said switch type regulator according to the relation between said output voltage and the first voltage preset value and the second voltage preset value;
When said output voltage during less than the said first voltage preset value, reverse load saltus step takes place in said switch type regulator;
When said output voltage during greater than the said second voltage preset value, the load saltus step of said switch type regulator generation forward;
When said output voltage greater than the said first voltage preset value during less than the said second voltage preset value, said switch type regulator is in lower state;
And, when said switch type regulator generation load saltus step, produce a skip signal;
Step 3-1: when said switch type regulator is in lower state, utilize the state of the said switch type regulator of a Steady-State Control signal controlling, so that the output voltage of said switch type regulator is kept substantially constant;
Step 3-2: when said switch type regulator generation load saltus step, utilize a dynamic control signal to control the state of said switch type regulator, so that the fast quick-recovery of the output voltage of said switch type regulator.
8. control method according to claim 7 is characterized in that, said step 3-2 may further comprise the steps:
Detect said output voltage, and judge whether output voltage arrives valley or peak value;
When said output voltage arrives valley, produce a valley signal;
According to said valley signal and said skip signal, produce said dynamic control signal;
The valid interval of said dynamic control signal is the initial moment of the initial moment of said skip signal effective status to the effective status of said valley signal;
When said output voltage during, produce a peak signal to peaking;
According to said peak signal and said skip signal, produce said dynamic control signal;
The valid interval of said dynamic control signal is the initial moment of the initial moment of said skip signal effective status to the effective status of said peak signal.
9. control method according to claim 7 is characterized in that, the generation step of said valley signal comprises:
The said output voltage of sampling, with produce one on the occasion of sampled voltage;
When said skip signal is effective, utilize said sampled voltage that one electric capacity is charged;
When said skip signal was invalid, said electric capacity discharged, and produced a capacitance voltage with first end at said electric capacity;
More said capacitance voltage and said sampled voltage, comparative result is as said valley signal.
The generation step of said peak signal comprises:
The said output voltage of sampling is to produce a sampled voltage;
When said skip signal is effective, utilize said sampled voltage that one electric capacity is charged;
When said skip signal was invalid, said electric capacity discharged, and produced a capacitance voltage with first end at said electric capacity;
More said capacitance voltage and said sampled voltage, comparative result is as said peak signal.
10. control method according to claim 7 is characterized in that, said step 3-2 may further comprise the steps:
Convert said output voltage into digital output voltage;
Compare current digit output voltage and said first voltage preset value and the said second voltage preset value;
Judge that whether the current digit output voltage is less than the said first voltage pre-set limit;
If the current digit output voltage is less than the said first voltage pre-set limit, said dynamic control signal becomes effective status by disarmed state;
Otherwise, continue to detect the current digit output voltage;
Judge that whether the current digit output voltage is greater than the last digit output voltage;
If the current digit output voltage is greater than the last digit output voltage, counter adds one;
If the current digit output voltage is less than last digit output voltage, counter O reset;
Whether the numerical value of judging counter arrives a preset value;
When the numerical value of counter reached a preset value, said dynamic control signal became disarmed state by effective status;
Otherwise, continue relatively current digit output voltage and last digit output voltage;
Judge that whether the current digit output voltage is greater than the second voltage pre-set limit;
If the current digit output voltage is greater than the second voltage pre-set limit, said dynamic control signal becomes effective status by disarmed state;
Otherwise, continue relatively the current digit output voltage and the second voltage pre-set limit;
Compare current digit output voltage and last digit output voltage;
If the current digit output voltage is less than the last digit output voltage, counter adds one;
If the current digit output voltage is greater than last digit output voltage, counter O reset;
Whether the numerical value of judging counter arrives a preset value;
If the numerical value of counter is during greater than a preset value, said dynamic control signal becomes disarmed state by effective status;
Otherwise, the lasting numerical value of judging counter.
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