CN106787730A - A kind of control method of on-off circuit, control circuit and on-off circuit - Google Patents
A kind of control method of on-off circuit, control circuit and on-off circuit Download PDFInfo
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- CN106787730A CN106787730A CN201710079791.5A CN201710079791A CN106787730A CN 106787730 A CN106787730 A CN 106787730A CN 201710079791 A CN201710079791 A CN 201710079791A CN 106787730 A CN106787730 A CN 106787730A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of control method of on-off circuit, control circuit and on-off circuit, the present invention is when switch periods start, the first switch pipe and the 3rd switching tube are turned on, the second switch pipe and the 4th switching tube are turned off, by the first ON time, compare the size of inductive current and instruction current；When the inductive current is less than the instruction current, then the first switch pipe and the 4th switching tube are turned on, and the second switch pipe and the 3rd switching tube are turned off, and until inductive current is more than or equal to instruction current, then this switch periods terminates；When the inductive current is more than or equal to the instruction current, then the first switch pipe and the 4th switching tube are turned off, the second switch pipe and the 3rd switching tube are turned on, until inductive current is less than or equal to instruction current, then this switch periods terminates, the present invention has higher conversion efficiency in the range of input and output voltage wider, and dynamic property is excellent, and reliability is high.
Description
Technical field
The present invention relates to electric and electronic technical field, and in particular to a kind of control method of on-off circuit, control circuit and
On-off circuit.
Background technology
Four switching tube Buck-Boost step-up/step-down circuit topological structures are as shown in Figure 1.The circuit includes Q1, Q2, Q3, Q4 tetra-
Individual power switch pipe, energy storage inductor L and input end capacitor Cin, output capacitor Co.Switching tube Q1 and switching tube Q2 connects,
The common port of switching tube Q1 and switching tube Q2 is first node SW1, and switching tube Q1 is connected to input, and switching tube Q2 is connected to
Ground, input is connected to ground by electric capacity Cin, and switching tube Q3 and switching tube Q4 connects, and switching tube Q3's and switching tube Q4 is public
It is Section Point SW2 to hold, and switching tube Q3 is connected to output end, and switching tube Q4 is connected to ground, and output end is connected to by electric capacity Co
Ground, inductance L is connected between first node SW1 and Section Point SW2.
As input voltage VINThan output voltage VODuring big certain value, this circuit is operated in Buck decompression modes, switching tube Q1,
Q2 is operated in HF switch state, and switching tube Q3 pipes often conducting, switching tube Q4 pipes are often closed；As input voltage VINCompare output voltage
VODuring small certain value, this circuit is operated in Boost boost modes, and switching tube Q3, switching tube Q4 is operated in HF switch state, opens
The often conducting of pipe Q1 pipes is closed, switching tube Q2 pipes are often closed；Work as VINWith VOWhen close, this circuit is operated in Buck-Boost lifting pressing molds
Formula, switching tube Q1, Q2, Q3, Q4 are in HF switch state.
Switching condition and control of the different control strategies for three kinds of mode of operations (Buck, Boost, Buck-Boost)
Method is different, and the condition of work for working in Buck-Boost buck-boost modes is also different.Due to both work of Buck, Boost
The efficiency of pattern is higher, and the operation interval it is desirable to Buck-Boost buck-boost modes is more narrow better.
A kind of existing control method is control circuit sampling input voltage VINWith output voltage VO, according to VINAnd VOElectricity
Three kinds of mode of operations of nip point：
VO≤VINDuring-Vth1, circuit is operated in Buck decompression modes；
VO≥VINDuring+Vth2, circuit is operated in Boost boost modes；
VIN-Vth1<VO<VIN+ Vth2, circuit is operated in Buck-Boost buck-boost modes；
Wherein, Vth1 and Vth2 is voltage threshold.
The control method distinguishes three kinds of mode of operations according to the magnitude relationship of input and output voltage.In order that output voltage is steady
It is fixed, it usually needs the operation interval of Buck-Boost buck-boost modes wider is set, the average efficiency of system is reduced.
Shown in another existing control method such as Fig. 2 (a), control circuit is by sampling resistor R01, R02 sampling output
Voltage VO, the sampled voltage FB for obtaining compared by operational amplifier U00 with internal reference signal Vref, exports thermal compensation signal
Two carrier signals that Vc, thermal compensation signal Vc and clock circuit U01 are produced are input to the input of comparison circuit U02, relatively more electric
Road U02 produces 4 drive signal PWM of pipe.It is saw shown in two carrier signal such as Fig. 2 (b) that clock circuit U01 is produced
Tooth ripple signal, when thermal compensation signal Vc falls at region 1 (grey parts), switching tube Q1, Q4 conducting；When thermal compensation signal Vc Luo areas
During domain 2 (white portion), switching tube Q1, Q3 conducting；When thermal compensation signal Vc falls at region 3 (oblique line portion), switching tube Q2, Q3
Conducting.I.e.
During Vc >=Vc1, circuit is operated in Boost boost modes；
During Vc≤Vc2, circuit is operated in Buck decompression modes；
Vc2<Vc<During Vc1, circuit is operated in Buck-Boost buck-boost modes.
The control method is needed using voltage mode control, and the dynamic response of system is poor.Reason is the change of voltage signal
Change and exist relative to current signal certain delayed, need to enable system by reducing system bandwidth during design control loop
Enough steady operations, such cost is the dynamic property of reduction system.
The content of the invention
In view of this, circuit and opened it is an object of the invention to provide a kind of control method of four switching tubes circuit, control
Powered-down road, is used to solve the problems, such as that system average efficiency is low in the prior art, system dynamic response is poor.
Technical solution of the invention is to provide a kind of control method of on-off circuit, including：First switch pipe,
Two switching tubes, the 3rd switching tube, the 4th switching tube and inductance, the first switch pipe and second switch pipe are connected, first switch
The common port of pipe and second switch pipe is first node, and the first switch pipe is connected to input, the second switch Guan Lian
Ground is connected to, the 3rd switching tube and the 4th switching tube are connected, the common port of the 3rd switching tube and the 4th switching tube is second section
Point, the 3rd switching tube is connected to output end, and the 4th switching tube is connected to ground, the inductance connection in first node and
Between Section Point, it is characterised in that the control method includes：
When switch periods start, the first switch pipe and the 3rd switching tube are turned on, the second switch pipe and
The 4th switching tube shut-off, by the first ON time, compares the size of inductive current and instruction current；
When the inductive current is less than the instruction current, then the first switch pipe and the 4th switching tube are turned on,
The second switch pipe and the 3rd switching tube are turned off, until inductive current is more than or equal to instruction current, then this switch periods
Terminate, into next switch periods；
When the inductive current is more than or equal to the instruction current, then the first switch pipe and the 4th switching tube are closed
Disconnected, the second switch pipe and the 3rd switching tube are turned on, and until inductive current is less than or equal to instruction current, then this switch is all
Phase terminates, into next switch periods.
Used as optional, the instruction current is obtained by output feedback signal and reference signal by after error amplification.
Used as optional, the output feedback signal includes：Output voltage feedback signal, output current feedback signal and output
Power feedback signal.
Used as optional, first ON time is directly proportional to less value in the first ratio and the second ratio；First ratio
It is worth the ratio for output voltage and input voltage, the second ratio is the ratio of input voltage and output voltage.
Another technical solution of the invention is to provide a kind of control circuit of on-off circuit, the on-off circuit bag
Include first switch pipe, second switch pipe, the 3rd switching tube, the 4th switching tube and inductance, the first switch pipe and second switch
Pipe is connected, and the common port of first switch pipe and second switch pipe is first node, and the first switch pipe is connected to input,
The second switch pipe is connected to ground, the 3rd switching tube and the series connection of the 4th switching tube, the 3rd switching tube and the 4th switching tube
Common port be Section Point, the 3rd switching tube is connected to output end, and the 4th switching tube is connected to ground, the inductance
It is connected between first node and Section Point, it is characterised in that the control circuit includes：
First comparison circuit and logic circuit；
Inductor current signal and instruction current are signally attached to the input of the first comparison circuit；First comparison circuit it is defeated
Go out to be signally attached to the input of logic circuit；
When switch periods start, logic circuit controls the first switch pipe and the 3rd switching tube conducting, described
Second switch pipe and the 4th switching tube are turned off, and by the first ON time, the first comparison circuit compares inductive current and refers to
Make the size of electric current；
When the inductive current is less than the instruction current, then logic circuit controls the first switch pipe and the described 4th
Switching tube is turned on, and the second switch pipe and the 3rd switching tube are turned off, until the first comparison circuit detects inductive current
More than or equal to instruction current, then this switch periods terminates, into next switch periods；
When the inductive current is more than or equal to the instruction current, then logic circuit controls the first switch pipe and described
4th switching tube is turned off, and the second switch pipe and the 3rd switching tube are turned on, until the first comparison circuit detects inductance
Electric current is less than or equal to instruction current, then this switch periods terminates, into next switch periods.
Used as optional, the control circuit also includes：First amplifier, error amplifies output feedback signal and reference signal,
Obtain the instruction current.
Used as optional, the control circuit also includes：First turn-on time generation circuit, produces the first ON time, institute
The first ON time is stated to be directly proportional to value small in the first ratio and the second ratio；First ratio is output voltage and input voltage
Ratio, the second ratio is the ratio of input voltage and output voltage.
Used as optional, first turn-on time generation circuit includes：Second comparison circuit, compares input voltage and output
Voltage, exports the first comparison voltage and the second comparison voltage, and voltage higher is the first comparison voltage, and relatively low voltage is the
Two comparison voltages；First division ratio circuit, by the second comparison voltage divided by the first comparison voltage, by after proportion adjustment, obtaining
To first ON time.
Used as optional, first turn-on time generation circuit includes：Second division ratio circuit, by input voltage divided by
Output voltage, by after proportion adjustment, obtaining the very first time, by output voltage divided by input voltage, by after proportion adjustment, obtaining
To the second time；3rd comparison circuit, relatively the very first time and second time, is output as the very first time and institute
The shorter time in the second time is stated, as first ON time.
Another technical solution of the invention is to provide a kind of on-off circuit.
Using circuit structure of the invention and method, compared with prior art, with advantages below：Buck-boost mode works
Interval narrow, system has high conversion efficiency in the range of input and output voltage wider.The present invention uses Controlled in Current Mode and Based, phase
For than voltage mode control, with more preferable dynamic property, including input voltage step response and output loading step response.
The present invention uses Cycle by Cycle current control, can limit the size of current of each switch periods, prevents electric current excessive and damages, because
And there is reliability higher.As input voltage VINWith output voltage VoMagnitude relationship it is different when, circuit can be switched to naturally
Different mode of operation, it is ensured that circuit normal work, meets system requirements.
Brief description of the drawings
Fig. 1 is four switching tube Buck-Boost step-up/step-down circuits of prior art；
Fig. 2 (a) is a kind of control circuit block diagram of four switching tubes Buck-Boost step-up/step-down circuits of prior art；
Fig. 2 (b) is the compensation in a kind of control circuit of four switching tubes Buck-Boost step-up/step-down circuits of prior art
Signal and carrier signal；
Fig. 3 is the flow chart of four switch controlleds method of the invention；
Fig. 4 is stable state waveform of the present invention under Buck decompression modes；
Fig. 5 is stable state waveform of the present invention under Boost boost modes；
Fig. 6 is stable state waveform of the present invention under Buck-Boost buck-boost modes；
Fig. 7 is circuit structure diagram of the invention；
Fig. 8 is the circuit structure diagram of the first turn-on time generation circuit；
Fig. 9 is another circuit structure diagram of the first turn-on time generation circuit；
Specific embodiment
The preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any replacement made in the spirit and scope of the present invention, modification, equivalent method and scheme.
In order that the public has to the present invention thoroughly understanding, it is described in detail in present invention below preferred embodiment specific
Details, and description without these details can also completely understand the present invention for a person skilled in the art.
The present invention is more specifically described by way of example referring to the drawings in the following passage.It should be noted that, accompanying drawing is adopted
Non- accurately ratio is used with the form for more simplifying and, is only used to convenience, lucidly aided in illustrating the embodiment of the present invention
Purpose.
With reference to shown in Fig. 3, the flow chart of four switch controlleds method of the invention is illustrated.The control method is based on figure
1 four switch topologies.Switching tube Q1 in Fig. 1 is first switch pipe, and switching tube Q2 is second switch pipe, and switching tube Q3 is
3rd switching tube, switching tube Q4 is the 4th switching tube.Switching tube Q1 and switching tube Q2 connects, the public affairs of switching tube Q1 and switching tube Q2
End is first node SW1 altogether, and switching tube Q1 is connected to input, and switching tube Q2 is connected to ground, and input is connected by electric capacity Cin
To ground, switching tube Q3 and switching tube Q4 connects, and the common port of switching tube Q3 and switching tube Q4 is Section Point SW2, switching tube Q3
Output end is connected to, switching tube Q4 is connected to ground, and output end is connected to ground by electric capacity Co, and inductance L is connected to first node SW1
And Section Point SW2 between.Technical solution of the invention is to provide a kind of control method of following steps：
Step S001：When switch periods start, first switch pipe and the 3rd switching tube are turned on, second switch pipe and the 4th
Switching tube is turned off.
Step S002：Judge whether to the first ON time, if not to continuing holding first if the first ON time
Switching tube and the 3rd switching tube are turned on, and second switch pipe and the 4th switching tube are turned off.
Step S003：When the first ON time is reached, then compare the size of inductive current and instruction current.
Step S004：After step S003, if inductive current is less than instruction current, first switch pipe and the 4th is opened
Pipe conducting is closed, second switch pipe and the 3rd switching tube are turned off.
Step S005：Judge the size of inductive current and instruction current, when inductive current be more than or equal to instruction current, then this
Switch periods terminate, and into next switch periods, that is, return to step S001, and first switch pipe and the 3rd switching tube are turned on, the
Two switching tubes and the 4th switching tube are turned off.
Step S006：After step S003, if inductive current is more than or equal to instruction current, first switch pipe and the
Four switching tubes are turned off, and second switch pipe and the 3rd switching tube are turned on.
Step S007：Judge the size of inductive current and instruction current, when inductive current is less than instruction current, then this is switched
End cycle, into next switch periods, that is, returns to step S001, and first switch pipe and the 3rd switching tube are turned on, and second opens
Close pipe and the shut-off of the 4th switching tube.
Instruction current is obtained by output feedback signal and reference signal by after error amplification in above-mentioned steps.Feedback signal
Including：Output voltage feedback signal, output current feedback signal and power output feedback signal.When feedback signal is output voltage
It is output Isobarically Control during feedback signal；It is output constant current control when feedback signal is output current feedback signal；Work as feedback
Signal is output constant power control when being power output feedback signal.
As a example by exporting Isobarically Control, working condition of the control method under the conditions of various input and output voltages is illustrated.
Describe for convenience, define UU states for first and third switching tube is turned on, the shut-off of second, four switching tubes；DU states are
Second and third switching tube is turned on, the shut-off of first, fourth switching tube；UD states are turned off for second and third switching tube, and first, fourth switching tube is led
It is logical.
With reference to shown in Fig. 4, as input voltage VINMore than output voltage VO, and when being limited not less than Buck maximum duty cycles,
Circuit works in Buck decompression modes.Under Buck decompression modes, the level low switching high of first node SW1, Section Point SW2
Level Chang Weigao.First switch pipe Q1 and second switch pipe Q2 complementary switch, the 3rd switching tube Q3 are often turned on, the 4th switch
Pipe Q4 is normally-off.Under Buck patterns, toggled in two states of UU and DU.As shown in figure 4, the t=0 moment, in UU shapes
State, now the level of first node SW1 is height, and the level of SW2 is height, and first switch pipe Q1 is turned on, second switch pipe Q2 shut-offs,
3rd switching tube Q3 is turned on, the 4th switching tube Q4 shut-offs.Inductive current iL linear rises.When the first ON time is reached, electricity
Inducing current iL is more than instruction current ic.Therefore, into DU states.Now the level of first node SW1 is low, Section Point SW2
Level for height, first switch pipe Q1 shut-off, second switch pipe Q2 conducting, the 3rd switching tube Q3 conducting, the 4th switching tube Q4 close
It is disconnected.On the other hand, due to Isobarically Control, instruction current ic is relative to keep stabilization.Inductive current iL linear declines, work as inductive current
When iL is equal to instruction current ic, into a next cycle, that is, UU states are again introduced into.
With reference to shown in Fig. 5, as input voltage VINLess than output voltage VO, and when being limited not less than Boost minimum duty cycles,
Circuit works in Boost boost modes.Under Boost boost modes, the level Chang Weigao of first node SW1, Section Point SW2
Level low switching high.Corresponding, first switch pipe Q1 is often turned on, and Q2 is normally-off for second switch pipe, the 3rd switching tube Q3 and
Four switching tube Q4 complementary switch.Under Boost patterns, toggled in two states of UU and UD.As shown in figure 5, the t=0 moment,
State machine is in UU states, and now the level of first node SW1 is height, and the level of Section Point SW2 is height, first switch pipe Q1
Conducting, second switch pipe Q2 shut-offs, the 3rd switching tube Q3 conductings, the 4th switching tube Q4 shut-offs.Inductive current iL linear declines.When
When reaching the first ON time, inductive current iL is less than instruction current ic.Therefore, state machine enters UD states.Now first segment
The level of point SW1 is height, and the level of Section Point SW2 is low, first switch pipe Q1 conductings, second switch pipe Q2 shut-offs, the 3rd
Switching tube Q3 is turned off, the 4th switching tube Q4 conductings.On the other hand, due to Isobarically Control, instruction current ic is relative to keep stabilization.Electricity
Inducing current iL linear rises, when inductive current iL is equal to instruction current ic, into a next cycle, that is, are again introduced into UU shapes
State.
With reference to shown in Fig. 6, as input voltage VINWith output voltage VOWhen close enough, circuit cannot work independently in Buck
Or Boost patterns, now circuit work in Buck-Boost patterns.Under Buck-Boost patterns, the level of first node SW1
Low switching high, the level low switching high of Section Point SW2.It is corresponding, first switch pipe Q1 and second switch pipe Q2 complementary switch,
3rd switching tube Q3 and the 4th switching tube Q4 complementary switch.Under Buck-Boost patterns, state machine is in DD, UD and UU tri-
State is toggled.At the t=0 moment, in UU states, now the level of first node SW1 is height, the electricity of Section Point SW2
It is height to put down, first switch pipe Q1 conductings, second switch pipe Q2 shut-offs, the 3rd switching tube Q3 conductings, the 4th switching tube Q4 shut-offs.When
When reaching the first ON time, inductive current iL is less than instruction current ic, and state machine enters UD states, now first node SW1
Level be height, the level of Section Point SW2 is low, first switch pipe Q1 conductings, second switch pipe Q2 shut-offs, the 3rd switching tube
Q3 is turned off, the 4th switching tube Q4 conductings.When inductive current iL is equal to instruction current ic, UU states are again introduced into.Should be noted
, now the magnitude relationship of iL and ic change.When the first ON time is reached, UU states terminate.When UU states terminate
When, inductive current iL is more than instruction current ic.Therefore, state machine can enter DU states.Now the level of first node SW1 is
Low, the level of Section Point SW2 is height, and first switch pipe Q1 shut-offs, second switch pipe Q2 conductings, the 3rd switching tube Q3 is turned on,
4th switching tube Q4 is turned off.When inductive current iL is equal to instruction current ic, UU states are again introduced into, into a next cycle.
Control method of the invention is applied to input voltage VINWith output voltage VOVarious situations of different sizes.Work as input
Voltage VINWith output voltage VOMagnitude relationship it is different when, circuit can naturally be switched to different mode of operations, it is ensured that circuit is just
Often work, meets system requirements.
The first ON time T in step S002UUIt is directly proportional to less value in the first ratio and the second ratio；Wherein
One ratio is output voltage VOWith input voltage VINRatio, the second ratio be input voltage VINWith output voltage VORatio,
That is TUU∝min(VO/VIN,VIN/VO).Under Buck decompression modes, VO<VIN, then TUU∝VO/VIN.Due to dutycycle D=TUU/TS
=VO/VIN, wherein TS is switch periods, therefore can realize system frequency surely with maintained switch constant period.In Boost liters
Under die pressing type, VIN<VO, then TUU∝VIN/VO, similarly system frequency surely can be realized with maintained switch constant period.First conducting
Time TUUCalculation be not limited only to aforesaid way, it is also possible to have other modes.
With reference to shown in Fig. 7, four switch controlled circuits of the embodiment of the present invention one are illustrated.The control circuit includes first
Comparison circuit U10 and logic circuit U11；Inductor current signal iL and instruction current signal ic are connected to the first comparison circuit U10
Input；The output signal OFF of the first comparison circuit U10 is connected to the input of logic circuit U11；Opened in switch periods
During the beginning, logic circuit U11 control the first switch pipe Q1 and the 3rd switching tube Q3 conducting, the second switch pipe Q2 and
The 4th switching tube Q4 shut-offs, by the first ON time TUU, the first comparison circuit U10 compares inductive current iL and instruction is electric
Flow the size of ic；When the inductive current iL is less than the instruction current ic, then logic circuit U11 controls the first switch pipe
Q1 and the 4th switching tube Q4 are turned on, and the second switch pipe Q2 and the 3rd switching tube Q3 is turned off, and are compared until first
Circuit U 10 detects inductive current iL and is more than or equal to instruction current ic, then this switch periods terminates, into next switch week
Phase；When the inductive current iL is more than or equal to the instruction current ic, then logic circuit U11 control the first switch pipe Q1 and
The 4th switching tube Q4 shut-offs, the second switch pipe Q2 and the 3rd switching tube Q3 is turned on, until the first comparison circuit
U10 detects inductive current iL and is less than or equal to instruction current ic, then this switch periods terminates, into next switch periods.
In embodiment one, the first comparison circuit can use comparator, then inductor current signal iL is connected to comparator
Inverting input；Thermal compensation signal ic is connected to the normal phase input end of comparator.
In embodiment one, also including the first amplifier U12, error amplifies output feedback signal and reference signal, obtains institute
State instruction current ic.Feedback signal can be voltage feedback signal, current feedback signal, power feedback signal, these three feedbacks
Signal corresponds to Isobarically Control, current constant control and power limitation control respectively.By taking Isobarically Control as an example, i.e., feedback signal is Voltage Feedback
Signal, output voltage VOBranch pressure voltage V is obtained by divider resistance R10 and R11FB, it is input to the anti-phase input of the first amplifier U12
End, reference voltage signal VREFIt is input to the normal phase input end of the first amplifier U12.
In embodiment one, the first ON time T that the first turn-on time generation circuit U13 is producedUUWith the first ratio and
Less value is directly proportional in second ratio；Wherein the first ratio is output voltage VOWith input voltage VINRatio, the second ratio
It is input voltage VINWith output voltage VORatio, i.e. TUU∝min(VO/VIN,VIN/VO)。
First turn-on time generation circuit U13 can include comparison circuit U130 using circuit as shown in Figure 8, the circuit
With division ratio circuit U 131.Input voltage VINWith output voltage VOTwo inputs of comparison circuit U130 are connected to, are compared
Circuit U 130 compares two voltages, exports the first comparison voltage and the second comparison voltage, and be connected to division ratio circuit U 131
Input, the first comparison voltage be input two voltages in magnitude of voltage value higher, the second comparison voltage is the two of input
The relatively low value of magnitude of voltage in individual voltage.Division ratio circuit is by the second comparison voltage divided by the first comparison voltage and by certain ratio
Example, obtains the first ON time, and used as the output of division ratio circuit U 131, i.e., the first turn-on time generation circuit U13's is defeated
Go out.
First turn-on time generation circuit U13 can also use circuit as shown in Figure 9, and the circuit is electric including division ratio
Road U132 and comparison circuit U133.Input voltage VINWith output voltage VOIt is connected to two inputs of division ratio circuit U 132
End, division ratio circuit U 132 is by input voltage VINDivided by output voltage VOAnd by certain proportion, obtain the very first time；Will be defeated
Go out voltage VODivided by input voltage VINAnd by certain proportion, obtained for the second time.The very first time and the second time are connected to ratio
Compared with the input of circuit U 133, comparison circuit U133 compares the very first time and the second time, and by the very first time and the second time
In shorter time as comparison circuit U133 output, i.e. the output of the first turn-on time generation circuit U13.
The implementation of the first turn-on time generation circuit U13 is not limited only to mode described above, it is also possible to have its other party
Formula.
In addition, although embodiment is separately illustrated and illustrated above, but it is related to the common technology in part, in this area
Those of ordinary skill apparently, can between the embodiments be replaced and integrate, and be related to one of embodiment that record is not known
Content, then refer to another embodiment on the books.
Embodiments described above, does not constitute the restriction to the technical scheme protection domain.It is any in above-mentioned implementation
Modification, equivalent and improvement made within the spirit and principle of mode etc., should be included in the protection model of the technical scheme
Within enclosing.
Claims (10)
1. a kind of control method of on-off circuit, the on-off circuit includes first switch pipe, second switch pipe, the 3rd switch
Pipe, the 4th switching tube and inductance, the first switch pipe and second switch pipe are connected, the public affairs of first switch pipe and second switch pipe
End is first node altogether, and the first switch pipe is connected to input, and the second switch pipe is connected to ground, the 3rd switch
The common port of pipe and the series connection of the 4th switching tube, the 3rd switching tube and the 4th switching tube is Section Point, and the 3rd switching tube connects
Be connected to output end, the 4th switching tube is connected to ground, the inductance connection between first node and Section Point, its feature
It is that the control method includes：
When switch periods start, the first switch pipe and the 3rd switching tube are turned on, the second switch pipe and described
4th switching tube is turned off, and by the first ON time, compares the size of inductive current and instruction current；
When the inductive current is less than the instruction current, then the first switch pipe and the 4th switching tube are turned on, described
Second switch pipe and the 3rd switching tube are turned off, and until inductive current is more than or equal to instruction current, then this switch periods terminates,
Into next switch periods；
When the inductive current is more than or equal to the instruction current, then the first switch pipe and the 4th switching tube are turned off,
The second switch pipe and the 3rd switching tube are turned on, until inductive current is less than or equal to instruction current, then this switch periods
Terminate, into next switch periods.
2. the control method of on-off circuit according to claim 1, it is characterised in that：The instruction current is by output feedback letter
Number and reference signal by error amplification after obtain.
3. the control method of on-off circuit according to claim 2, it is characterised in that the output feedback signal includes：
Output voltage feedback signal, output current feedback signal and power output feedback signal.
4. the control method of on-off circuit according to claim 1, it is characterised in that：First ON time and the first ratio
Less value is directly proportional in value and the second ratio；First ratio is the ratio of output voltage and input voltage, and the second ratio is defeated
Enter the ratio of voltage and output voltage.
5. a kind of control circuit of on-off circuit, the on-off circuit includes first switch pipe, second switch pipe, the 3rd switch
Pipe, the 4th switching tube and inductance, the first switch pipe and second switch pipe are connected, the public affairs of first switch pipe and second switch pipe
End is first node altogether, and the first switch pipe is connected to input, and the second switch pipe is connected to ground, the 3rd switch
The common port of pipe and the series connection of the 4th switching tube, the 3rd switching tube and the 4th switching tube is Section Point, and the 3rd switching tube connects
Be connected to output end, the 4th switching tube is connected to ground, the inductance connection between first node and Section Point, its feature
It is that the control circuit includes：
First comparison circuit and logic circuit；
Inductor current signal and instruction current are signally attached to the input of the first comparison circuit；The output letter of the first comparison circuit
Number it is connected to the input of logic circuit；
When switch periods start, logic circuit controls the first switch pipe and the 3rd switching tube conducting, described second
Switching tube and the 4th switching tube are turned off, and by the first ON time, the first comparison circuit compares inductive current and instruction electricity
The size of stream；
When the inductive current is less than the instruction current, then logic circuit controls the first switch pipe and the 4th switch
Pipe is turned on, and the second switch pipe and the 3rd switching tube are turned off, and are more than until the first comparison circuit detects inductive current
Equal to instruction current, then this switch periods terminates, into next switch periods；
When the inductive current is more than or equal to the instruction current, then logic circuit controls the first switch pipe and the described 4th
Switching tube is turned off, and the second switch pipe and the 3rd switching tube are turned on, until the first comparison circuit detects inductive current
Less than or equal to instruction current, then this switch periods terminates, into next switch periods.
6. the control circuit of on-off circuit according to claim 5, it is characterised in that the control circuit also includes：
First amplifier, error amplifies output feedback signal and reference signal, obtains the instruction current.
7. the control circuit of on-off circuit according to claim 5, it is characterised in that the control circuit also includes：
First turn-on time generation circuit, produces the first ON time, first ON time and the first ratio and the second ratio
The medium and small value of value is directly proportional；First ratio is the ratio of output voltage and input voltage, and the second ratio is input voltage and output
The ratio of voltage.
8. the control circuit of on-off circuit according to claim 7, it is characterised in that first turn-on time generation circuit
Including：
Second comparison circuit, compares input voltage and output voltage, exports the first comparison voltage and the second comparison voltage, higher
Voltage is the first comparison voltage, and relatively low voltage is the second comparison voltage；
First division ratio circuit, by the second comparison voltage divided by the first comparison voltage, by after proportion adjustment, obtaining described
One ON time.
9. the control circuit of on-off circuit according to claim 7, it is characterised in that first turn-on time generation circuit
Including：
Second division ratio circuit, by input voltage divided by output voltage, by after proportion adjustment, obtaining the very first time, will be defeated
Go out voltage divided by input voltage, by after proportion adjustment, obtaining for the second time；
3rd comparison circuit, relatively the very first time and second time, is output as the very first time and described second
The shorter time in time, as first ON time.
10. a kind of on-off circuit, it is characterised in that：Including controlling circuit as described in claim 5~9 any one.
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| CN201710079791.5A CN106787730B (en) | 2017-02-15 | 2017-02-15 | Control method and control circuit of switching circuit and switching circuit |
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| CN201710079791.5A CN106787730B (en) | 2017-02-15 | 2017-02-15 | Control method and control circuit of switching circuit and switching circuit |
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| CN106787730B CN106787730B (en) | 2023-07-18 |
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| CN112769182A (en) * | 2020-12-31 | 2021-05-07 | 湖北工业大学 | Efficient and rapid active equalization circuit for echelon battery |
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| CN106787730B (en) | 2023-07-18 |
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