CN103856043B - Control circuit and four-switch buck-boost converter - Google Patents
Control circuit and four-switch buck-boost converter Download PDFInfo
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- CN103856043B CN103856043B CN201410096210.5A CN201410096210A CN103856043B CN 103856043 B CN103856043 B CN 103856043B CN 201410096210 A CN201410096210 A CN 201410096210A CN 103856043 B CN103856043 B CN 103856043B
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Abstract
The invention provides a control circuit and a four-switch buck-boost converter. The control circuit is used for the four-switch buck-boost converter. The control circuit comprises a feedback compensating circuit and a control signal generation circuit, wherein the control signal generation circuit is used for generating a first control signal, a second control signal, a third control signal and a fourth control signal, the first control signal and the second control signal control a first power switch and a second power switch to be switched on or switched off alternately, and the third control signal and the fourth control signal control a third power switch and a fourth power switch to be switched on or switched off alternately; the first control signal controls the first power switch to be switched on when a first sampling signal drops to a first compensation signal; when a charging voltage rises to an average voltage, the first control signal controls the first power switch to be switched off; the charging voltage starts to rise when the first power switch and the fourth power switch are switched on simultaneously, and the average voltage changes along with the switching period. The control circuit can control the power switches of the four-switch buck-boost converter to be switched on alternately. Consequently, seamless switching can be achieved and the efficiency of the circuit can be improved.
Description
Technical field
The present invention relates to Power Electronic Technique, and in particular to for four switch control circuits of buck-boost type changers and right
The four switch buck-boost type changers answered.
Background technology
Due to four switch buck-boost type changers（Also referred to as H bridges buck-boost type changer）Achievable same polarity ascending, descending pressure
Function, thus be used widely.Fig. 1 is the schematic diagram of four switch buck-boost type inverter power level circuits, such as Fig. 1 institutes
Show, four switch buck-boost type changers include the first power switch pipe Q1, the second power switch pipe Q2, the 3rd power switch pipe Q3
With the 4th power switch pipe Q4, and output capacitance Co, energy storage inductor L.By the break-make for controlling first to fourth power switch pipe,
Output voltage needed for exportable.
But, existing control mode there is a problem of power switch can not preferably alternate conduction, thus cause conversion
Device is inefficient.
The content of the invention
In view of this, the technical problem to be solved is to provide a kind of control circuit and four switch buck-boost types become
Parallel operation so that four switch buck-boost type changers can improve circuit efficiency with seamless switching.
A kind of first aspect, there is provided control circuit, for four switch buck-boost type changers, the control circuit includes anti-
Feedback compensation circuit and control signal generative circuit；
The feedback compensation circuit is used to compare feedback voltage signal and reference voltage signal, to produce the first thermal compensation signal
With the second thermal compensation signal, second thermal compensation signal is scheduled voltage with the difference of the first thermal compensation signal；
The control signal generative circuit be used for generate the first control signal, the second control signal, the 3rd control signal and
4th control signal, first to fourth control signal controls respectively first to fourth power switch of the changer；
Wherein, first control signal is when the first sampled signal drops to first thermal compensation signal, and control is described
First power switch is turned on, when charging voltage rises to average voltage, control the first power switch shut-off；The charging voltage
Begin to ramp up when simultaneously turning in first power switch and the 4th power switch, the average voltage becomes with switch periods
Change；
3rd control signal controls the 3rd work(when the first sampled signal drops to first thermal compensation signal
Rate switch conduction, when second sampled signal rises to second thermal compensation signal, controls the 3rd power switch and closes
It is disconnected；
Second control signal control second power switch relative to the first power switch alternate conduction and
Shut-off；4th control signal controls the 4th power switch relative to the 3rd power switch alternate conduction and pass
It is disconnected；
First sampled signal and the second sampled signal are used to all or part of sign inductor current value.
Preferably, first sampled signal characterizes the current value through second power switch, second sampling
Current value of the characterization through the 3rd power switch.
Preferably, the scheduled voltage be proportional to power stage circuit output voltage it is absolute with input voltage difference
Value.
Preferably, the control signal generative circuit include first comparator, the second comparator, the first rest-set flip-flop, the
Two rest-set flip-flops, reset signal generative circuit, the first logic drive circuit and the second logic drive circuit；
The first comparator is connected to the set end of first rest-set flip-flop and second rest-set flip-flop, for than
First sampled signal and first thermal compensation signal, in first sampled signal first thermal compensation signal is dropped to
When export set signal；
The reset signal generative circuit is connected to the reset terminal of first rest-set flip-flop, in the charging voltage
The first reset signal is exported when rising to the average voltage；
Second comparator is connected to the reset terminal of second rest-set flip-flop, for relatively more described second sampled signal
With second thermal compensation signal, the reset of output second letter when second sampled signal rises to second thermal compensation signal
Number；
First logic drive circuit is according to the output signal of first rest-set flip-flop output the first control letter
Number and the second control signal；
Second logic drive circuit is according to the output signal of second rest-set flip-flop output the 3rd control letter
Number and the 4th control signal.
Preferably, the reset signal generative circuit includes logic circuit, charging voltage circuit, average voltage circuit and ratio
Compared with output circuit；
The logic circuit exports charging control signal, and the charging control signal is in first power switch and the 4th
State is off when power switch is simultaneously turned on；
The average-voltage signal that the average voltage circuit output changes with switch periods；
The charging voltage circuit exports what is risen with predetermined slope during the charging control signal is off state
The charging voltage signal；
It is described to compare the output circuit charging voltage signal and average-voltage signal, in the charging voltage signal
First reset signal is exported when rising to the average-voltage signal.
Preferably, the average voltage circuit includes the first charge switch, the first current source, charging resistor, filter resistance
And filter capacitor；First current source and first charge switch and the charging resistor be connected in parallel common port and
Between earth terminal, the filter resistance is connected between the common port and the first outfan, and the filter capacitor is connected to institute
State between the first output and ground；
The charging voltage circuit includes the second charge switch, the second current source and charging capacitor；Second current source,
Second charge switch and the charging capacitor are connected in parallel between the second outfan and the earth terminal；
First outfan exports the average-voltage signal；
Second outfan exports the charging voltage signal.
Preferably, it is described to compare output circuit for the 3rd comparator.
Preferably, the output circuit that compares is including the 3rd comparator and minimum time circuit, the minimum time circuit
It is connected with the outfan of the 3rd comparator, first reset signal of the output with the minimal reset time.
Second aspect, there is provided a kind of four switch buck-boost type changer, including power stage circuit and as above described in any one
Control circuit；
The power stage circuit includes that the first power switch, the second power switch, the 3rd power switch, the 4th power are opened
Pass, energy storage inductor and output capacitance；
First power switch is connected to the voltage input end of the power stage circuit and the first of the energy storage inductor
Between end；
Second power switch is connected between the first end of the energy storage inductor and the earth terminal；
3rd power switch is connected between the second end of the energy storage inductor and the earth terminal；
4th power switch is connected to the voltage output end of the power stage circuit and the second of the energy storage inductor
Between end.
The present invention controls the first power switch and the 4th according to charging voltage and the average voltage related to switch periods
The time that power switch is simultaneously turned on, each power switch is controlled by characterizing the sampled signal and thermal compensation signal of inductive current,
So that each power switch of four switch buck-boost type changers can realize seamless switching with alternate conduction, and improve circuit
Efficiency.
Description of the drawings
By referring to the drawings to the description of the embodiment of the present invention, above-mentioned and other purposes of the present invention, feature and
Advantage will be apparent from, in the accompanying drawings：
Fig. 1 is the schematic diagram of four switch buck-boost type inverter power level circuits；
Fig. 2A is the circuit diagram of four switch buck-boost type changers of first embodiment of the invention；
Fig. 2 B are the signal waveforms of first embodiment of the invention；
Fig. 3 is the circuit diagram of the control circuit of four switch buck-boost type changers of second embodiment of the invention；
Fig. 4 is the circuit diagram of the reset signal generative circuit that second embodiment of the invention is adopted；
Fig. 5 is one circuit diagram for preferably comparing output circuit of second embodiment of the invention；
Fig. 6 is the signal waveform schematic diagram of second embodiment of the invention.
Specific embodiment
Below based on embodiment, present invention is described, but the present invention is not restricted to these embodiments.Under
It is detailed to describe some specific detail sections in detailed description of the text to the present invention.Do not have for a person skilled in the art
The description of these detail sections can also completely understand the present invention.In order to avoid obscuring the essence of the present invention, known method, mistake
The not narration in detail of journey, flow process, element and circuit.
Additionally, it should be understood by one skilled in the art that provided herein accompanying drawing is provided to descriptive purpose, and
What accompanying drawing was not necessarily drawn to scale.
It will also be appreciated that in the following description, " circuit " is referred to by least one element or electronic circuit by electric
The galvanic circle that connection or electromagnetism are connected and composed." connect when element or another element of circuit " being connected to " or title element/circuit is claimed
" between two nodes when, it can directly be coupled or be connected to another element or there may be intermediary element, element it
Between connection can be physically, in logic or its combination.Conversely, " connecting when title element " being directly coupled to " or directly
Be connected to " another element when, it is meant that there is no intermediary element in both.
Unless the context clearly requires otherwise, otherwise entire disclosure is similar with " including " in claims, "comprising" etc.
Word should be construed to the implication for including rather than exclusive or exhaustive implication；That is, be " including but not limited to " contains
Justice.
In describing the invention, it is to be understood that term " first ", " second " etc. are not only used for describing purpose, and not
It is understood that to indicate or implying relative importance.Additionally, in describing the invention, unless otherwise stated, the implication of " multiple "
It is two or more.
Fig. 2A is the circuit diagram of four switch buck-boost type changers of first embodiment of the invention.As shown in Figure 2 A,
Four switch buck-boost type changers 20 include power stage circuit 21 and control circuit 22.
Power stage circuit 21 includes the first power switch Q1, the second power switch Q2, the 3rd power switch Q3, the 4th power
Switch Q4, energy storage inductor L and output capacitance Co。
First power switch Q1 is connected between the first end of voltage input end and energy storage inductor L.
Second power switch Q2 is connected between the first end of energy storage inductor L and earth terminal gnd.
3rd power switch Q3 is connected between second end of energy storage inductor L and earth terminal gnd.
4th power switch Q4 is connected between voltage output end and second end of energy storage inductor L.
Output capacitance CoIt is connected between voltage output end and earth terminal gnd.
In a preferred scheme, power stage circuit 21 can also include input capacitance Cin.Those skilled in the art hold
Readily understood input capacitance CinIt is not the necessary parts of power stage circuit.
In the present embodiment, power switch can be any controllable semiconductor switch device, and such as metal-oxide is partly led
Body field-effect transistor（MOSFET）Deng.
Control circuit 22 includes feedback compensation circuit 221 and control signal generative circuit 222.
Feedback compensation circuit 221 is used to compare feedback voltage signal vfbWith reference voltage signal vref, to produce the first compensation
Signal vcWith the second thermal compensation signal vc’.Second thermal compensation signal vc' it is higher than the first thermal compensation signal vc.Second thermal compensation signal vc' and first
Thermal compensation signal vcDifference be scheduled voltage.
Preferably, the scheduled voltage be proportional to power stage circuit output voltage it is absolute with input voltage difference
Value.
Control signal generative circuit 222 is used to generate the first control signal vQ1, the second control signal vQ2, the 3rd control letter
Number vQ3With the 4th control signal vQ4.First control signal vQ1Control the first power switch Q1, the second control signal vQ2Control second
Power switch Q2, the 3rd control signal vQ3Control the 3rd power switch Q3, the 4th control signal vQ4Control the 4th power switch
Q4。
Wherein, the first control signal vQ1With the second control signal vQ2The first power switch Q1 and the second power are controlled respectively
Switch Q2 alternate conductions and shut-off, namely so that both states are contrary.For example, in the first power switch Q1 and the second power
When switch Q2 is nmos pass transistor, the first control signal vQ1With the second control signal vQ2For mutually anti-phase signal.And example
Such as, when the first power switch Q1 and the second power switch Q2 are respectively nmos pass transistor and PMOS transistor, the first control letter
Number vQ1With the second control signal vQ2For identical signal.
3rd control signal vQ3With the 4th control signal vQ4The 3rd power switch Q3 and the 4th power switch Q4 is controlled respectively
Alternate conduction and shut-off, namely so that both states are contrary.For example, in the 3rd power switch Q3 and the 4th power switch Q4
When being nmos pass transistor, the 3rd control signal vQ3With the 4th control signal vQ4For mutually anti-phase signal.Again for example, the
When three power switch Q3 and the 4th power switch Q4 are respectively nmos pass transistor and PMOS transistor, the 3rd control signal vQ3With
Four control signals vQ4For identical signal.
First sampled signal vL_valWith the second sampled signal vL_pkIt is used to all or part of sign inductive current state.
For example, the first sampled signal vL_valCharacterize the current value through the second power switch, the second sampled signal vL_pkTable
Levy the current value through the 3rd power switch.
First sampled signal vL_valThe bulk resistance voltage drop that the second power switch Q2 of detection can be passed through is obtained.Second adopts
Sample signal vL_pkThe bulk resistance voltage drop that the 3rd power switch Q3 of detection can be passed through is obtained.
Fig. 2 B are the signal waveforms of first embodiment of the invention.
As shown in Figure 2 B, in t1To t2Period, the first power switch Q1 and the 3rd power switch Q3 are turned on, inductive current iL
It is linearly increasing, also, inductive current iLFlow through the first power switch Q1 and the 3rd power switch Q3.That is, during this period, pass through
The electric current of the 3rd power switch Q3 is equal to inductive current iL.Second sampled signal vL_pkCharacterize the electricity through the 3rd power switch Q3
Stream, therefore, the second sampled signal vL_pkIn t1To t2Period linear rise.
Simultaneously as the second power switch Q2 shut-offs, current value therethrough is zero.First sampled signal vL_valIt is zero.
In t2To t3Period, the second power switch Q2 and the 3rd power switch Q3 is turned off, therefore, through both electric currents
Value is zero.First sampled signal vL_valWith the second sampled signal vL_pkAlso it is zero.
In t3To t4Period, the second power switch Q2 is turned on and the 3rd power switch Q3 is turned off, therefore, inductive current iLLine
Property reduce, also, inductive current iLFlow through the 4th power switch Q4 and the second power switch Q2.That is, during this period, Jing Guo
The electric current of two power switch Q2 is equal to inductive current iL.First sampled signal vL_valCharacterize the electricity through the second power switch Q2
Stream, therefore, the first sampled signal vL_valIn t3To t4Period linear decline.
First sampled signal vL_valIn t3To t4The waveform of period and inductive current iLIn t3To t4The synchronous waveform of period becomes
Change.
Second sampled signal vL_pkIn t1To t2The waveform of period and inductive current iLIn t1To t2The synchronous waveform of period becomes
Change.
Therefore, based on the first sampled signal vL_valWith the second sampled signal vL_pkThe control for power switch can be realized
System.
First control signal vQ1In the first sampled signal vL_valDrop to the first thermal compensation signal vcWhen control the first power and open
Close Q1 conductings.
Accordingly, when the first power switch Q1 is turned on, the second power switch Q2 shut-offs；In the first power switch Q1 shut-offs
When, the second power switch Q2 conductings.In charging voltage vctRise to average voltage vavgWhen, control the first power switch Q1 shut-offs.
Accordingly, the second control signal vQ2Control the second power switch Q2 to turn on when the first power switch Q1 is turned off, in the first power
Switch Q1 is turned off when turning on.
Charging voltage vctBegin to ramp up when simultaneously turning in the first power switch Q1 and the 4th power switch Q4.Average voltage
vavgWith switch periods TSChange, in TSOne timing, average voltage vavgKeep constant.
3rd control signal vQ3In the first sampled signal vL_valDrop to the first thermal compensation signal vcWhen, the 3rd power of control is opened
Q3 conductings are closed, in the second sampled signal vL_pkRise to the second thermal compensation signal vc' when, control the 3rd power switch Q3 shut-offs.
Accordingly, when the 3rd power switch Q3 is turned on, the 4th power switch Q4 shut-offs；In the 3rd power switch Q3 shut-offs
When, the 4th power switch Q4 conductings.
The present embodiment controls the first power switch and according to charging voltage and the average voltage related to switch periods
The time that four power switch are simultaneously turned on, opened controlling each power with thermal compensation signal by characterizing the sampled signal of inductive current
Close so that each power switch of four switch buck-boost type changers can realize seamless switching with alternate conduction, and improve circuit
Efficiency.
Fig. 3 is the circuit diagram of the control circuit of four switch buck-boost type changers of second embodiment of the invention.Such as
Shown in Fig. 3, control circuit 32 includes feedback compensation circuit 321 and control signal generative circuit 322.
Feedback compensation circuit 321 is used to compare feedback voltage signal vfbWith reference voltage signal vref, to produce the first compensation
Signal vcWith the second thermal compensation signal vc’.Second thermal compensation signal vc' it is higher than the first thermal compensation signal vc.Second thermal compensation signal vc' and first
Thermal compensation signal vcDifference be scheduled voltage.
Preferably, the scheduled voltage be proportional to power stage circuit output voltage it is absolute with input voltage difference
Value.
Specifically, it can include trsanscondutance amplifier Gm, compensating electric capacity CcAnd voltage source.Feedback voltage vfbIt is input to mutual conductance
The inverting input of amplifier Gm, reference voltage signal vrefIt is input to the in-phase input end of trsanscondutance amplifier Gm.Trsanscondutance amplifier
The outfan of Gm exports the first thermal compensation signal v as the first thermal compensation signal outfan of feedback compensation circuit 321c.Voltage source connects
It is connected between the outfan of trsanscondutance amplifier Gm and the second thermal compensation signal outfan, exports the first thermal compensation signal v of ratiocThe predetermined electricity of height
Second thermal compensation signal v of pressure valuec’.Certainly, it should be readily apparent to one skilled in the art that feedback compensation circuit 321 can also adopt it
Its circuit structure is realizing.
Control signal generative circuit 322 is used to generate first to fourth control signal vQ1、vQ2、vQ3、vQ4。
Specifically, it includes first comparator A1, the second comparator A2, the first rest-set flip-flop RS1, the second rest-set flip-flop
RS2, reset signal generative circuit RST, the first logic drive circuit DR1 and the second logic drive circuit DR2.
The outfan of first comparator A1 is connected to the set end of the first rest-set flip-flop RS1 and the second rest-set flip-flop RS2, its
In-phase input end is connected to the first thermal compensation signal outfan of feedback compensation circuit 321, and its inverting input input first is sampled
Signal vL_val.First comparator A1 is used to compare the first sampled signal vL_valWith the first thermal compensation signal vc, in the first sampled signal
vL_valDrop to the first thermal compensation signal vcWhen export set signal vval。
Reset signal generative circuit RST is connected to the reset terminal of the first rest-set flip-flop RS1, in charging voltage vctRise
To average voltage vavgWhen export the first reset signal rst1.
The outfan of the second comparator A2 is connected to the reset terminal of the second rest-set flip-flop RS2, its in-phase input end input the
Two sampled signals vL_pk, its inverting input is connected to the second thermal compensation signal outfan of feedback compensation circuit 321, and it is used to compare
Second sampled signal vL_pkWith the second thermal compensation signal vc', in the second sampled signal vL_pkRise to the second thermal compensation signal
vc' when export the second reset signal vpk。
First logic drive circuit DR1 exports the first control signal according to the output signal of the first rest-set flip-flop RS1
vQ1With the second control signal vQ2。
Second logic drive circuit DR2 exports the 3rd control signal according to the output signal of the second rest-set flip-flop RS2
vQ3With the 4th control signal vQ4。
When the first power switch Q1 and the second power switch Q2 are nmos pass transistor, the first control signal vQ1With second
Control signal vQ2For mutually anti-phase signal, the first driving logic circuit DR1 includes first be connected with the first rest-set flip-flop RS1
Not gate, the first not gate exports the second control signal vQ2, the first rest-set flip-flop RS1 can directly export the first control signal vQ1,
First control signal v can be exported by drive circuitQ1。
When the 3rd power switch Q3 and the 4th power switch Q4 are nmos pass transistor, the 3rd control signal vQ3With the 4th
Control signal vQ4For mutually anti-phase signal, the second driving logic circuit DR2 includes second be connected with the second rest-set flip-flop RS2
Not gate, the second not gate exports the 4th control signal vQ4, the second rest-set flip-flop RS2 can directly export the 3rd control signal vQ3,
3rd control signal v can be exported by drive circuitQ3。
Fig. 4 is the circuit diagram of the reset signal generative circuit that second embodiment of the invention is adopted.Reset signal is given birth to
Include logic circuit NAND, charging voltage circuit CHG, average voltage circuit AVG into circuit RST and compare output circuit OUT.
When logic circuit NAND is the transistor of same type in first to fourth power switch, preferably NAND gate,
Its input is input into the first control signal vQ1With the 4th control signal vQ4, export charging control signal vQ.Therefore, charge control letter
Number vQIn the first control signal vQ1With the 4th control signal vQ4State is off when being conducting state, that is, it is first
Power switch Q1 and four power switch Q4 are off state when simultaneously turning on.
Average voltage circuit AVG exports the average-voltage signal v changed with switch periodsavg。
Charging voltage circuit CHG is in charging control signal vQDuring off state, export with filling that predetermined slope rises
Piezoelectric voltage signal vct。
In a preferred embodiment, average voltage circuit AVG include the first charge switch S1, the first current source I1,
Charging resistor Rt, filter resistance RfWith filter capacitor Cf.First current source I1 and the first charge switch S1 and charging resistor RtAnd
Connection is connected between common port on and earth terminal gnd.Filter resistance RfIt is connected between common port on and the first outfan avg,
Filter capacitor CfIt is connected between the first outfan avg and earth terminal gnd.
First outfan avg exports average-voltage signal vavg。
Charging voltage circuit CHG includes the second charge switch S2, the second current source I2 and charging capacitor Ct；Second current source
I2, the second charge switch S2 and charging capacitor CtIt is connected in parallel between the second outfan ct and earth terminal gnd.
Second outfan ct exports charging voltage signal vct。
Relatively output circuit OUT compares charging voltage signal vctWith average-voltage signal vavg.In charging voltage signal vct
Rise to average-voltage signal vavgWhen export first reset signal rst1.
In a preferred embodiment, it is the 3rd comparator A3 to compare output circuit OUT, and under the premise of here, first answers
Position signal rst1 is pulse signal.
In another preferred embodiment, as shown in figure 5, comparing output circuit OUT including the 3rd comparator A3 and most
Little time circuit mini_on, minimum time circuit mini_on are connected with the outfan of comparator, when output has minimal reset
Between the first reset signal rst1.
Fig. 6 is the signal waveform schematic diagram of second embodiment of the invention.The changer of the present embodiment is illustrated below in conjunction with Fig. 5
Operation principle.In the present embodiment, with high level as conducting state, low level is off state, and is opened with all of power
Close premised on the device for same type to illustrate.Certainly, it should be readily apparent to one skilled in the art that for other side
Consider, it is also possible to low level is set to into conducting state, high level is set to off state.Can with for different switch or
Transistor arranges different instruction level.For be adapted to level definition change and power switch Change of types and to circuit institute
The change made is only the equivalent that those skilled in the art are readily apparent that.
First sampled signal vL_valThe current value through the second power switch Q2 is characterized, it is in t3To t4The waveform of period with
Inductive current iLIn t3To t4The synchronous waveform change of period.
Second sampled signal vL_pkThe current value through the 3rd power switch Q3 is characterized, it is in t1To t2The waveform of period with
Inductive current iLIn t1To t2The synchronous waveform change of period.
Therefore, inductive current i is only shown in figureLChange curve.
In t1Moment, the first sampled signal vL_valDrop to the first thermal compensation signal vc, first comparator A1 output high level,
First rest-set flip-flop RS1 and the second rest-set flip-flop RS2 are set, so as to export high level.First control signal vQ1Switch to height
Level, the 3rd control signal vQ3Switch to high level.Therefore, the first power switch Q1 and the 3rd power switch Q3 are switched to and led
It is logical, meanwhile, the second power switch Q2 and the 4th power switch Q4 switch to shut-off.
In t1To t2Period, the first power switch Q1 and the 3rd power switch Q3 are turned on, meanwhile, the second power switch Q2 and
4th power switch Q4 is held off, inductive current iLIncrease, meanwhile, with inductive current iLSecond sampled signal of synchronous change
vL_pkRise.
In t2Moment, the second sampled signal vL_pkRise to the second thermal compensation signal vc', the second comparator A2 output high level,
Second rest-set flip-flop RS2 is reset, so as to export low level.3rd control signal vQ3Switch to low level, the 4th control signal
vQ4Switch to high level.Therefore, the 3rd power switch Q3 switches to shut-off, the 4th power switch Q4 to switch to conducting.
Simultaneously as the first control signal vQ1With the 4th control signal vQ4It is simultaneously high level, logic circuit NAND is exported
Low level, the first charge switch S1 of control and the second charge switch S2 shut-offs.In average voltage circuit, because the first charging is opened
S1 shut-offs are closed, the first current source I1 starts to charging resistor RtAnd by filter resistance RfWith filter capacitor CfThe circuit of composition is supplied
Electricity.The voltage of the first outfan avg outputs is meansigma methodss of the voltage of common port in whole switch periods, therefore, referred to as
Average voltage vavg.In charging voltage circuit, due to the second charge switch S2 shut-offs, the second current source I2 starts to the electricity that charges
Hold CtCharge, therefore, in charging voltage v of the second outfan ctctStart by zero linear rising.
In t2To t3Period, the first power switch Q1 and the 4th power switch Q4 are turned on.Inductive current iLReduce.
In t3Moment, charging voltage vctRise to average voltage vavg, the 3rd comparator A3 output high level, a RS touch
Send out device RS1 to be reset, so as to export low level.First control signal vQ1Switch to low level, the second control signal vQ2Switch to
High level.Therefore, the first power switch Q1 switches to shut-off, the second power switch Q2 to switch to conducting.
Simultaneously as the first control signal vQ1Low level is switched to, therefore, the logic electricity of reset signal generative circuit RST
Road NAND exports high level so that the first charge switch S1 and the second charge switch S2 is turned off.The voltage vanishing of common port on,
Filter capacitor CfElectric discharge, the average voltage v of the first outfan avg outputsavgRemain slow to decline.And the second outfan ct is exported
Charging voltage vanishing.3rd comparator A3 exports low level.
In t3Moment, reset signal generative circuit meets equation below, i.e.,：
Wherein, TsFor switch periods time, I1And I2The electricity of respectively the first current source I1 and the second current source I2 outputs
Stream.In I1=I2When, can be obtained according to above formula：
TS=Rt·Ct
Thus, in stable state, switch periods TsBe one only with charging resistor RtWith charging capacitor CtRelevant definite value, this
Embodiment can realize quasi- fixed-frequency control by reset signal generative circuit RST.
When the 3rd comparator A3 does not connect minimum time circuit mini_on, the first reset signal rst1 is reset arteries and veins
Punching.
When the 3rd comparator A3 connects minimum time circuit mini_on, minimum time circuit mini_on is according to the 3rd ratio
Compared with the first reset signal that the output of pulse signal of device A3 outputs has the minimal reset time so that the first power switch Q1 is at least
A predetermined minimum time is turned off, meanwhile, the second power switch Q2 at least turns on a predetermined minimum time.
In t3To t4Period, the second power switch Q2 and the 4th power switch Q4 are turned on.Inductive current iLReduce.Therefore, exist
With inductive current i during thisLFirst sampled signal v of synchronous changeL_valDecline.
In t4Moment, the first sampled signal vL_valDrop to the first thermal compensation signal vc.First comparator A1 exports high level,
First rest-set flip-flop RS1 and the second rest-set flip-flop RS2 are set, so as to export high level.First to fourth power switch Q1 is extremely
Q4 returns to t1The state at moment.Start next switch periods.
Thus, each power switch pipe alternate conduction is made, seamless switching is realized, the output voltage needed for producing, and improve
The efficiency of circuit.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for those skilled in the art
For, the present invention can have various changes and change.All any modification, equivalents made within spirit and principles of the present invention
Replace, improve etc., should be included within the scope of the present invention.
Claims (9)
1. a kind of control circuit, for four buck-boost type changers are switched, and the control circuit includes feedback compensation circuit and control
Signal generating circuit processed；
The feedback compensation circuit is used to compare feedback voltage signal and reference voltage signal, to produce the first thermal compensation signal and the
Two thermal compensation signals, second thermal compensation signal is scheduled voltage with the difference of the first thermal compensation signal；
The control signal generative circuit is used to generate the first control signal, the second control signal, the 3rd control signal and the 4th
Control signal, first to fourth control signal controls respectively first to fourth power switch of the changer；
Wherein, first control signal controls described first when the first sampled signal drops to first thermal compensation signal
Power switch is turned on, when charging voltage rises to average voltage, control the first power switch shut-off；The charging voltage is in institute
State the first power switch and the 4th power switch simultaneously turns on period with predetermined slope rising, the average voltage is with switch periods
Change；
3rd control signal controls the 3rd power and opens when the first sampled signal drops to first thermal compensation signal
Conducting is closed, when the second sampled signal rises to second thermal compensation signal, the 3rd power switch shut-off is controlled；
Second control signal controls second power switch relative to the first power switch alternate conduction and shut-off；
4th control signal controls the 4th power switch relative to the 3rd power switch alternate conduction and shut-off；
First sampled signal and the second sampled signal are used to all or part of sign inductor current value.
2. control circuit according to claim 1, it is characterised in that first sampled signal is characterized through described second
The current value of power switch, second sampled signal characterizes the current value through the 3rd power switch.
3. control circuit according to claim 1, it is characterised in that the scheduled voltage is proportional to power stage circuit
The absolute value of output voltage and input voltage difference.
4. control circuit according to claim 1, it is characterised in that the control signal generative circuit compares including first
Device, the second comparator, the first rest-set flip-flop, the second rest-set flip-flop, reset signal generative circuit, the first logic drive circuit and
Two logic drive circuits；
The first comparator is connected to the set end of first rest-set flip-flop and second rest-set flip-flop, for comparing
The first sampled signal and first thermal compensation signal are stated, it is defeated when first sampled signal drops to first thermal compensation signal
Go out set signal；
The reset signal generative circuit is connected to the reset terminal of first rest-set flip-flop, for rising in the charging voltage
The first reset signal is exported during to the average voltage；
Second comparator is connected to the reset terminal of second rest-set flip-flop, for relatively more described second sampled signal and institute
The second thermal compensation signal is stated, when second sampled signal rises to second thermal compensation signal the second reset signal is exported；
First logic drive circuit according to the output signal of first rest-set flip-flop export first control signal and
Second control signal；
Second logic drive circuit according to the output signal of second rest-set flip-flop export the 3rd control signal and
4th control signal.
5. control circuit according to claim 4, it is characterised in that the reset signal generative circuit includes logic electricity
Road, charging voltage circuit, average voltage circuit and compare output circuit；
The logic circuit exports charging control signal, and the charging control signal is in first power switch and the 4th power
Switch is off state when simultaneously turning on；
The average voltage that the average voltage circuit output changes with switch periods；
The charging voltage circuit is exported with described in predetermined slope rising during the charging control signal is off state
Charging voltage；
It is described to compare the output circuit charging voltage and average voltage, rise to the average electricity in the charging voltage
First reset signal is exported during pressure.
6. control circuit according to claim 5, it is characterised in that the average voltage circuit includes that first charges and open
Pass, the first current source, charging resistor, filter resistance and filter capacitor；First current source and first charge switch with
And the charging resistor is connected in parallel between common port and earth terminal, the filter resistance is connected to the common port and first
Between outfan, the filter capacitor is connected between first output and ground；
The charging voltage circuit includes the second charge switch, the second current source and charging capacitor；It is second current source, described
Second charge switch and the charging capacitor are connected in parallel between the second outfan and the earth terminal；
First outfan exports the average voltage；
Second outfan exports the charging voltage.
7. control circuit according to claim 5, it is characterised in that described to compare output circuit for the 3rd comparator.
8. control circuit according to claim 5, it is characterised in that it is described compare output circuit including the 3rd comparator and
Minimum time circuit, the minimum time circuit is connected with the outfan of the 3rd comparator, when output has minimal reset
Between first reset signal.
9. a kind of four buck-boost type changer switched, including power stage circuit and as any one of requiring 1-8 in right
Control circuit；
The power stage circuit includes the first power switch, the second power switch, the 3rd power switch, the 4th power switch, storage
Can inductance and output capacitance；
First power switch be connected to the voltage input end of the power stage circuit and the energy storage inductor first end it
Between；
Second power switch is connected between the first end of the energy storage inductor and earth terminal；
3rd power switch is connected between the second end of the energy storage inductor and the earth terminal；
4th power switch be connected to the voltage output end of the power stage circuit and the energy storage inductor the second end it
Between.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410096210.5A CN103856043B (en) | 2014-03-14 | 2014-03-14 | Control circuit and four-switch buck-boost converter |
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| CN201410096210.5A CN103856043B (en) | 2014-03-14 | 2014-03-14 | Control circuit and four-switch buck-boost converter |
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| CN103856043B true CN103856043B (en) | 2017-04-12 |
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| CN105471264B (en) * | 2015-12-24 | 2018-05-29 | 矽力杰半导体技术(杭州)有限公司 | For the control circuit and control method of four switch buck-boost converters |
| US11264902B2 (en) * | 2016-03-02 | 2022-03-01 | Analog Devices International Unlimited Company | Inductor current based mode control for buck-boost converters |
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| US10135340B1 (en) * | 2017-09-11 | 2018-11-20 | Linear Technology Holding Llc | Pass through regulation of buck-boost regulator |
| CN111488024B (en) * | 2019-01-25 | 2022-04-19 | 添可智能科技有限公司 | Cleaning equipment and power adjusting method |
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| CN110086156B (en) * | 2019-04-30 | 2022-02-25 | 广东美的制冷设备有限公司 | Drive control circuit and air conditioner |
| CN110350773B (en) * | 2019-06-28 | 2020-11-20 | 长安大学 | Current sampling and limiting circuit of four-switch Buck-Boost converter |
| CN111313705B (en) * | 2020-04-02 | 2021-08-17 | 浙江大学 | Control method of switch converter |
| CN112564482B (en) * | 2020-12-08 | 2022-05-20 | 西安特来电智能充电科技有限公司 | Four-switch-tube buck-boost converter control method and device, controller and storage medium |
| CN113422513B (en) * | 2021-08-04 | 2023-01-24 | 上海南芯半导体科技股份有限公司 | Control method of BUCK-BOOST converter |
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