CN107070216A - 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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- CN107070216A CN107070216A CN201710240190.8A CN201710240190A CN107070216A CN 107070216 A CN107070216 A CN 107070216A CN 201710240190 A CN201710240190 A CN 201710240190A CN 107070216 A CN107070216 A CN 107070216A
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1203—Circuits independent of the type of conversion
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- 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
-
- 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)
- Electronic Switches (AREA)
- Amplifiers (AREA)
- Inverter Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of control method of on-off circuit, control circuit and on-off circuit.The on-off circuit includes first switch pipe, second switch pipe, the 3rd switching tube, the 4th switching tube and inductance, when switch periods start, first switch pipe and the conducting of the 3rd switching tube, second switch pipe and the shut-off of the 4th switching tube, when inductive current is more than first threshold, then first switch pipe and the 4th switching tube are turned off, second switch pipe and the conducting of the 3rd switching tube, until inductive current is less than or equal to Second Threshold, then this switch periods terminates；When inductive current is less than the 4th threshold value, then first switch pipe and the conducting of the 4th switching tube, second switch pipe and the 3rd switching tube are turned off, and until inductive current is more than or equal to the 3rd threshold value, then this switch periods terminates.The present invention has higher conversion efficiency in the range of wider input and output voltage, 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
Four power switch pipes, energy storage inductor L and input end capacitor Cin, output capacitor Co.Switching tube Q1 and switching tube Q2 strings
Connection, switching tube Q1 and switching tube Q2 common port are first node SW1, and switching tube Q1 is connected to input, switching tube Q2 connections
To ground, input is connected to ground, switching tube Q3 and switching tube Q4 series connection by electric capacity Cin, switching tube Q3 and switching tube Q4's
Common port is Section Point SW2, and switching tube Q3 is connected to output end, and switching tube Q4 is connected to ground, and output end is connected by electric capacity Co
Ground is connected to, 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 are operated in HF switch state, and the normal conducting of switching tube Q3 pipes, switching tube Q4 pipes are often closed；As input voltage VINThan 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 shape
State, the normal conducting of switching tube Q1 pipes, switching tube Q2 pipes are normal to close；Work as VINWith VOWhen close, this circuit is operated in Buck-Boost
Buck-boost mode, 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 processed is different, and the condition of work for working in Buck-Boost buck-boost modes is also different.Due to both works of Buck, Boost
The efficiency of operation mode is higher, more narrow better it is desirable to the operation interval of Buck-Boost buck-boost modes.
A kind of existing control method is control circuit sampling input voltage VINWith output voltage VO, according to VINAnd VO's
Voltage distinguishes three kinds of mode of operations：
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
It is stable, it usually needs the operation interval of wider Buck-Boost buck-boost modes is set, the average efficiency of system is reduced.
Shown in another existing control method such as Fig. 2 (a), control circuit is sampled by sampling resistor R01, R02 and exported
Voltage VO, obtained sampled voltage FB 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 comparison circuit U02 input, relatively more electric
Road U02 produces the drive signal PWM of 4 pipes.Shown in two carrier signal such as Fig. 2 (b) that clock circuit U01 is produced, for saw
Tooth ripple signal, when thermal compensation signal Vc falls at region 1 (grey parts), switching tube Q1, Q4 conducting；When thermal compensation signal Vc falls
During region 2 (white portion), switching tube Q1, Q3 conducting；When thermal compensation signal Vc falls at region 3 (oblique line portion), switching tube
Q2, Q3 are turned on.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 there is necessarily delayed relative to current signal, need to cause system by reducing system bandwidth during design control loop
Can steady operation, 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, to solve the problem of system average efficiency in the prior art is low, system dynamic response is poor.
The technical solution of the present 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, first switch pipe and second switch the pipe series connection, 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, and the inductance connection is in first node
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 conducting, the second switch pipe and
The 4th switching tube shut-off,
When the inductive current is more than first threshold, then the first switch pipe and the 4th switching tube shut-off, described
Second switch pipe and the 3rd switching tube conducting, until inductive current is less than or equal to Second Threshold, then this switch periods knot
Beam, into next switch periods；
When the inductive current is less than the 4th threshold value, then the first switch pipe and the 4th switching tube conducting, described
Second switch pipe and the 3rd switching tube shut-off, until the inductive current is more than or equal to the 3rd threshold value, then this is switched
End cycle, into next switch periods, wherein, the first threshold is more than or equal to the Second Threshold, the 3rd threshold
Value is more than or equal to the 4th threshold value.
It is described in the first threshold, the Second Threshold, the 3rd threshold value and the 4th threshold value as optional
Second Threshold is equal to the 3rd threshold value；Or the first threshold is equal to the Second Threshold and is equal to the 3rd threshold value；Or institute
State Second Threshold and be equal to the 4th threshold value equal to the 3rd threshold value.
As optional, the first threshold, the Second Threshold, the 3rd threshold value and the 4th threshold value are by instructing
Electric current is obtained.
As optional, the instruction current is obtained by output feedback signal and reference signal after error is amplified.
As optional, the output feedback signal includes：
Output voltage feedback signal or output current feedback signal or power output feedback signal.
As optional, the Second Threshold and the 3rd threshold value are equal to the instruction current, and the first threshold is institute
State instruction current and difference current sum；4th threshold value is that the instruction current subtracts the difference current.
As optional, the switch periods were more than for first scheduled time, then reduced the difference current；The switch week
Phase is less than first scheduled time, then improves the difference current；The switch periods are equal to first scheduled time,
Then the difference current is constant.
It is used as optional, the first switch pipe and the 3rd switching tube conducting, the second switch pipe and the described 4th
Switching tube is turned off, and the state duration reached for second scheduled time,
When the inductive current is more than 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 conducting, until inductive current is less than or equal to instruction current, then this switch periods
Terminate, into next switch periods；
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 shut-off, until the inductive current be more than or equal to the instruction current, then this
Switch periods terminate, into next switch periods.
Another technical solution of the present 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 4th the switching tube series connection, 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 electricity
Sense is connected between first node and Section Point, it is characterised in that the control circuit includes：
Inductive current controls circuit；
Inductor current signal, first threshold, Second Threshold, the 3rd threshold value and the 4th threshold value are connected to the inductive current
Control the input of circuit, the inductive current control circuit output switching signal；
When switch periods start, the inductive current control circuit controls the first switch pipe and the described 3rd to open
Pipe conducting, the second switch pipe and the 4th switching tube shut-off are closed,
When inductive current control electric circuit inspection to the inductive current more than first threshold, then the inductive current
Circuit is controlled to control the first switch pipe and the 4th switching tube shut-off, the second switch pipe and the 3rd switch
Pipe is turned on, and until the inductive current controls electric circuit inspection to be less than or equal to Second Threshold to the inductive current, then this switch is all
Phase terminates, into next switch periods；
When inductive current control electric circuit inspection to the inductive current less than the 4th threshold value, then the inductive current
Circuit is controlled to control the first switch pipe and the 4th switching tube conducting, the second switch pipe and the 3rd switch
Pipe is turned off, and until the inductive current controls electric circuit inspection to be more than or equal to the 3rd threshold value to the inductive current, then this is opened
End cycle is closed, into next switch periods, wherein, the first threshold is more than or equal to the Second Threshold, the described 3rd
Threshold value is more than or equal to the 4th threshold value.
As optional, the Second Threshold is equal to the 3rd threshold value and is equal to instruction current.
It is described to control circuit also to include as optional：
First amplifier, error amplification output feedback signal and reference signal, obtain the instruction current.
It is described to control circuit also to include as optional：
Adder, its input connects the instruction current and difference current, and its output end is the first threshold, institute
It is the instruction current and the difference current sum to state first threshold；
Subtracter, its input connects the instruction current and the difference current, and its output end is the 4th threshold
Value, the 4th threshold value is that the instruction current subtracts the difference current.
It is described to control circuit also to include as optional：
Difference current adjusts circuit, and switching signal is connected to its input, and its output end exports the difference current, institute
Switch periods are stated more than first scheduled time, the difference current is reduced；The switch periods are less than the described first pre- timing
Between, improve the difference current；The switch periods are equal to first scheduled time, then the difference current is constant.
The another technical solution of the present invention is to provide a kind of on-off circuit.
Using the circuit structure and method of the present invention, compared with prior art, with advantages below：Buck-boost mode work
Make interval narrow, system has high conversion efficiency in the range of wider input and output voltage.The present invention uses current-mode control
For system, comparison with voltage Schema control, with more preferable dynamic property, including input voltage step response and output loading rank
Jump response.The present invention uses Cycle by Cycle current control, can limit the size of current of each switch periods, prevent electric current excessive
And damage, thus with higher reliability.As input voltage VINWith output voltage VoMagnitude relationship it is different when, circuit can
Naturally different mode of operations are switched to, it is ensured that circuit normal work, meet 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 another flow chart of four switch controlleds method of the invention；
Stable state waveforms of the Fig. 5 for the present invention under Buck decompression modes；
Stable state waveforms of the Fig. 6 for the present invention under Boost boost modes；
Another stable state waveforms of the Fig. 7 for the present invention under Buck decompression modes；
Stable state waveforms of the Fig. 8 for the present invention under Buck-Boost buck-boost modes；
Fig. 9 is circuit structure diagram of the invention；
Figure 10 is a kind of physical circuit schematic diagram of the invention；
Figure 11 is the circuit structure diagram that difference current adjusts circuit；
Figure 12 is the circuit diagram of timing circuit of the present invention.
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 this
A little embodiments.The present invention covers any replacement made in the spirit and scope of the present invention, modification, equivalent method and scheme.
Thoroughly understand in order that the public has to the present invention, tool is described in detail in present invention below preferred embodiment
The details of body, and description without these details can also understand the present invention completely 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
With more simplified form and using non-accurately ratio, only to convenience, the embodiment of the present invention is lucidly aided in illustrating
Purpose.
With reference to shown in Fig. 3, the flow chart of the four switch controlled methods of the present invention is illustrated.The control method is based on
Fig. 1 four switch topologies.Switching tube Q1 in Fig. 1 is first switch pipe, and switching tube Q2 is second switch pipe, switching tube
Q3 is the 3rd switching tube, and switching tube Q4 is the 4th switching tube.Switching tube Q1 and switching tube Q2 series connection, switching tube Q1 and switching tube
Q2 common port is first node SW1, and switching tube Q1 is connected to input, and switching tube Q2 is connected to ground, and input passes through electric capacity
Cin is connected to ground, and switching tube Q3 and switching tube Q4 connect, and switching tube Q3 and switching tube Q4 common port are Section Point SW2,
Switching tube Q3 is connected to output end, and switching tube Q4 is connected to ground, and output end is connected to ground by electric capacity Co, and inductance L is connected to the
Between one node SW1 and Section Point SW2.The technical solution of the present invention is to provide a kind of controlling party of following steps
Method：
Step S001：When switch periods start, first switch pipe and the conducting of the 3rd switching tube, second switch pipe and the
Four switching tubes are turned off.
Step S002：Judge whether inductive current is more than first threshold, if greater than first threshold, then into step
S004, otherwise continues to keep first switch pipe and the conducting of the 3rd switching tube, second switch pipe and the shut-off of the 4th switching tube, and
Into step S003.
Step S003：Judge whether inductive current is less than the 4th threshold value, if less than the 4th threshold value, then into step
S006, otherwise continues to keep first switch pipe and the conducting of the 3rd switching tube, second switch pipe and the shut-off of the 4th switching tube, and
Into step S002.
Step S004：After step S002, then first switch pipe and the shut-off of the 4th switching tube, second switch pipe and the
Three switching tubes are turned on.
Step S005：Judge the size of inductive current and Second Threshold, when inductive current is less than Second Threshold, then this is opened
End cycle is closed, into next switch periods, that is, step S001, first switch pipe and the conducting of the 3rd switching tube, second is returned to
Switching tube and the shut-off of the 4th switching tube.
Step S006：After step S003, first switch pipe and the conducting of the 4th switching tube, second switch pipe and the 3rd
Switching tube is turned off.
Step S007：Judge the size of inductive current and the 3rd threshold value, when inductive current be more than or equal to the 3rd threshold value, then
This switch periods terminates, into next switch periods, that is, returns to step S001, first switch pipe and the conducting of the 3rd switching tube,
Second switch pipe and the shut-off of the 4th switching tube.
, can be all unequal in first threshold, Second Threshold, the 3rd threshold value and the 4th threshold value, can also Second Threshold etc.
In the 3rd threshold value；Or first threshold is equal to the 3rd threshold value described in institute's Second Threshold；Or Second Threshold is equal to the 3rd threshold value and is equal to the
Four threshold values.
First threshold, Second Threshold, the 3rd threshold value and the 4th threshold value are obtained by instruction current.
In one embodiment, Second Threshold is equal to the 3rd threshold value and is equal to instruction current.Instruction current is by output feedback letter
Number and reference signal obtained after error is amplified.Feedback signal includes：Output voltage feedback signal or output current feedback letter
Number or power output feedback signal.It is output Isobarically Control when feedback signal is output voltage feedback signal；Work as feedback signal
It is output constant current control during for output current feedback signal；It is the permanent work(of output when feedback signal is power output feedback signal
Rate is controlled.
In one embodiment, first threshold is instruction current ic and difference current Δ i sums；4th threshold value is instruction
Electric current ic subtracts difference current Δ i.
In one embodiment, it can realize that determining frequency works by adjusting difference current Δ i, specific method is：It is described to open
The pass cycle was more than for first scheduled time T, i.e., predetermined switch periods then reduce the difference current Δ i；The switch periods
Less than first scheduled time T, then the difference current Δ i is improved；The switch periods are equal to first scheduled time
T, the then constant Δ i of the difference current.
Describe for convenience, define UU states and turned on for first and third switching tube, the shut-off of second, four switching tubes；DU states
Turned on for second and third switching tube, the shut-off of first, fourth switching tube；UD states turn off for second and third switching tube, first, fourth switch
Pipe is turned on.
In one embodiment, when input and output voltage is close, circuit is in UU states, and inductive current may
Always between first threshold and the 4th threshold value, therefore, UU states can be constantly in, then vibration occurs in inductive current.For
The vibration of inductive current is avoided, following control method is added：
UU state durations reached for second scheduled time, when the inductive current is more than the instruction current, then entered
DU states, until inductive current is less than or equal to instruction current, then this switch periods terminates, and into next switch periods, that is, enters
Enter UU states；When the inductive current be less than the instruction current, then into UD states, until the inductive current be more than etc.
In the instruction current, then this switch periods terminates, into next switch periods, i.e., into UU states.With reference to shown in Fig. 4,
On the rate-determining steps shown in Fig. 3, to add above-mentioned control method.
Step S001：When switch periods start, first switch pipe and the conducting of the 3rd switching tube, second switch pipe and the
Four switching tubes are turned off.
Step S002：Judge whether inductive current is more than first threshold, if greater than first threshold, then into step
S004, otherwise continues to keep first switch pipe and the conducting of the 3rd switching tube, second switch pipe and the shut-off of the 4th switching tube, and
Into step S003.
Step S003：Judge whether inductive current is less than the 4th threshold value, if less than the 4th threshold value, then into step
S006, otherwise continues to keep first switch pipe and the conducting of the 3rd switching tube, second switch pipe and the shut-off of the 4th switching tube, and
Into step S100.
Step S100：Judge first switch pipe and the conducting of the 3rd switching tube, second switch pipe and the shut-off of the 4th switching tube,
Whether the state maintenance time reached for second scheduled time, if being not reaching to for second scheduled time, into step S002,
If reaching for second scheduled time, into step S101.
Step S101：Judge whether inductive current is more than instruction current, if greater than instruction current, then into step
S004, if less than equal to instruction current, then into step S006.
Step S004：After step S002 or step S101, then first switch pipe and the shut-off of the 4th switching tube, second
Switching tube and the conducting of the 3rd switching tube.
Step S005：Judge the size of inductive current and instruction current, when inductive current is less than instruction current, then this is opened
End cycle is closed, into next switch periods, that is, step S001, first switch pipe and the conducting of the 3rd switching tube, second is returned to
Switching tube and the shut-off of the 4th switching tube.
Step S006：After step S003 or step S101, first switch pipe and the conducting of the 4th switching tube, second opens
Close pipe and the shut-off of the 3rd switching tube.
Step S007：Judge the size of inductive current and instruction current, when inductive current be more than or equal to instruction current, then
This switch periods terminates, into next switch periods, that is, returns to step S001, first switch pipe and the conducting of the 3rd switching tube,
Second switch pipe and the shut-off of the 4th switching tube.
Exemplified by exporting Isobarically Control, illustrate working condition of the control method under the conditions of various input and output voltages.
With reference to shown in Fig. 5, as input voltage VINMore than output voltage VO, and UU state durations are predetermined less than second
During the time, circuit works in Buck decompression modes.Under Buck decompression modes, the first node SW1 high low switching of level, the
Two node SW2 level Chang Weigao.First switch pipe Q1 and second switch pipe Q2 complementary switch, the 3rd switching tube Q3 are often turned on,
4th switching tube Q4 is normally-off.Under Buck patterns, toggled in two states of UU and DU.As shown in figure 5, the t=0 moment,
In UU states, now first node SW1 level is height, and SW2 level is height, first switch pipe Q1 conductings, second switch
Pipe Q2 is turned off, the 3rd switching tube Q3 conductings, the 4th switching tube Q4 shut-offs.Inductive current iLLinear rise.As inductive current iLArrive
During up to first threshold, into DU states.Now first node SW1 level is low, and Section Point SW2 level is height, first
Switching tube Q1 is turned off, second switch pipe Q2 conductings, the 3rd switching tube Q3 conductings, the 4th switching tube Q4 shut-offs.On the other hand, by
In Isobarically Control, instruction current ic is relative to keep stable.Inductive current iLLinear decline, as inductive current iLEqual to instruction current
During ic, into a next cycle, that is, UU states are again introduced into.
With reference to shown in Fig. 6, as input voltage VINLess than output voltage VO, and UU state durations are predetermined less than second
During the time, circuit works in Boost boost modes.Under Boost boost modes, first node SW1 level Chang Weigao, the
The two node SW2 high low switching of level.Corresponding, first switch pipe Q1 is often turned on, and second switch pipe Q2 is normally-off, and the 3rd opens
Close pipe Q3 and the 4th switching tube Q4 complementary switch.Under Boost patterns, toggled in two states of UU and UD.Such as Fig. 6 institutes
Show, the t=0 moment, in UU states, now first node SW1 level is height, and Section Point SW2 level is height, first
Switching tube Q1 is turned on, second switch pipe Q2 shut-offs, the 3rd switching tube Q3 conductings, the 4th switching tube Q4 shut-offs.Inductive current iLLine
Property decline.As inductive current iLWhen reaching Second Threshold, into UD states.Now first node SW1 level is height, second
Node SW2 level is low, and first switch pipe Q1 conductings, second switch pipe Q2 shut-offs, the 3rd switching tube Q3 is turned off, and the 4th opens
Close pipe Q4 conductings.On the other hand, due to Isobarically Control, instruction current ic is relative to keep stable.Inductive current iLLinear rise,
As inductive current iLDuring equal to instruction current ic, into a next cycle, that is, UU states are again introduced into.
When input and output voltage is close, when input voltage is more than output voltage, UU state durations reach second and made a reservation for
During the time, inductive current iLMore than instruction current ic, then into DU states, inductive current iLDecline, as inductive current iLDecline
During to instruction current ic, UU states are again introduced into.If input voltage is more than output voltage, inductive current rises, such as Fig. 7
It is shown, continue to operate in Buck states；When input and output voltage is further to UU state durations reach second and made a reservation for
During the time, inductive current iLMore than instruction current ic, then into DU states, inductive current iLDecline, as inductive current iLDecline
During to instruction current ic, UU states are again introduced into, when starting due to comparator in the presence of delay, therefore UU states, inductive current iL
Already less than instruction current ic, when UU state durations reached for second scheduled time, inductive current iLStill less than instruction electricity
Ic is flowed, then into UD states, by the minimum ON time of UD states, inductive current iLMore than instruction current ic, it is again introduced into
UU states, as shown in Figure 8.Therefore, when input and output voltage is close, the control mode can be according to output-input voltage
Size, takes over seamlessly in Buck, Buck-Boost and Boost pattern.And now switching frequency is low, system effectiveness is high.
The control method of the present invention is applied to input voltage VINWith output voltage VOVarious situations of different sizes.When defeated
Enter voltage VINWith output voltage VOMagnitude relationship it is different when, circuit can be switched to different mode of operations naturally, it is ensured that circuit
Normal work, meets system requirements.
With reference to shown in Fig. 9, four switch controlled circuits of the embodiment of the present invention one are illustrated.The control circuit includes electricity
Electrification flow control circuit 201.Inductor current signal iL, first threshold, Second Threshold, the 3rd threshold value and the 4th threshold value be connected to
The inductive current controls the input of circuit 201, the inductive current control circuit output switching signal G1-G4, by driving
Dynamic circuit, difference controlling switch Q1-Q4.When switch periods start, inductive current control circuit 201 control first is opened
Close the switch Q3 pipe conductings of pipe Q1 and the 3rd, the switch Q4 pipe shut-offs of second switch pipe Q2 and the 4th, when inductive current controls circuit
201 detect institute inductive current iLMore than first threshold, then inductive current control circuit 201 control first switch pipe Q1 and the
Four switching tube Q4 are turned off, second switch pipe Q2 and the 3rd switching tube Q3 conductings, until inductive current control circuit 201 is detected
The inductive current iLLess than or equal to Second Threshold, then this switch periods terminates, into next switch periods；When inductance electricity
Flow control circuit 201 detects the inductive current iLLess than the 4th threshold value, then inductive current control circuit 201 control first
Switching tube Q1 and the 4th switching tube Q4 conductings, second switch pipe Q2 and the 3rd switching tube Q3 shut-offs, until inductive current control
Circuit 201 detects inductive current iLMore than or equal to the 3rd threshold value, then this switch periods terminates, into next switch periods.
Wherein, first threshold is more than or equal to Second Threshold, and the 3rd threshold value is more than or equal to the 4th threshold value.
It refer to shown in Figure 10, in one embodiment, Second Threshold is equal to the 3rd threshold value and is equal to instruction current.
In one embodiment, control circuit also includes adder 203 and subtracter 204, adder and subtracter it is defeated
Enter end all link order electric current ic and difference current Δ i, the output end of adder is first threshold, and first threshold is instruction electricity
Flow ic and difference current Δ i sums, i.e. ic+ Δs i；The output end of subtracter is Second Threshold, and Second Threshold is instruction current ic
Subtract difference current Δ i, i.e. ic- Δs i.
In one embodiment, control circuit also includes the first amplifier 202.The error of first amplifier 202 amplification output feedback
Signal FB and reference signal Vref1, obtains instruction current ic.Then it is constant pressure when output feedback signal FB fed-back output voltages
Output, can use divider resistance sampling and outputting voltage；Then it is constant current output when output feedback signal FB feeds back output current,
Sampling resistor sampled output current can be used；Then it is constant power output when output feedback signal FB feedback output powers, can
With sampling and outputting voltage and output current, to obtain power output.
Determine frequency work to realize, control circuit also includes difference current and adjusts circuit 205, and switching signal is connected to it
Input, its output end output difference current Δ i, when switch periods are more than the first scheduled time T, then reduces difference current Δ
i；When switch periods are less than the first scheduled time T, then difference current Δ i is improved；Switch periods are equal to the first scheduled time T, then
Difference current Δ i is constant.
Figure 11 and Figure 12 are refer to, is a kind of implementation that difference current adjusts circuit 205.Difference current regulation electricity
Road 205 includes timing circuit 501, voltage comparator circuit 502 and regulation circuit 503.Switching signal is electric as timing is connected to
Road 501 and the input of voltage comparator circuit 502, the output end of timing circuit 502 are connected to the another of voltage comparator circuit 502
One input, the output end of voltage comparator circuit 502 is connected to the input of regulation circuit 503, adjusts the output difference of circuit 503
It is worth electric current Δ i.
Timing circuit 501, including current source 5011, switch 5013 and electric capacity 5012.Wherein current source 5011 and electric capacity
5012 series connection, switch 5013 and electric capacity 5012 are in parallel.When UU states start, switch 5013 first turns on certain time, the time
Considerably shorter than UU state durations, such as 30ns, the upper voltage amplitude of electric capacity 5012 to 0.Then switch 5013 is turned off, utilized
Current source 5011 charges to electric capacity 5012.The current source 5011 can be fixed current source, or on-fixed electric current
Source.In the present embodiment, by adjusting the size of current source 5011 and electric capacity 5012 so that in the first scheduled time T, electric capacity
5012 can be charged to reference voltage Vref 2 just.When switch periods are long, the time of the shut-off of switch 5013 is longer, until
Next switch occurs, the overlong time that electric capacity 5012 charges, and now voltage comparator circuit 502 is defeated by the voltage of electric capacity 5012
Go out end output timing voltage (i.e. the crest voltage of electric capacity 5012) to be compared with reference voltage Vref 2, when timing voltage is more than
Reference voltage Vref 2, then when showing that next UU states occur, more than the first scheduled time T；When switch periods are too short, switch
The time of 5013 shut-offs is too short, and until next switch periods occur, the time that electric capacity 5012 charges is too short, now voltage ratio
Compared with circuit 502 by the timing voltage (i.e. the crest voltage of electric capacity 5012) and reference voltage of the voltage output end of electric capacity 5012
Vref2 is compared, and when timing voltage is less than reference voltage Vref 2, is then shown when next UU states occur, not to the
One scheduled time T.
When next cycle UU states occur, during more than the first scheduled time T, then the reduction current differential of circuit 503 is adjusted
Δ i, then switch periods shorten；When next cycle UU states occur, during not less than the first scheduled time T, then circuit is adjusted
503 high current difference DELTA i, then switch periods are elongated；When switch periods and first so as to controlling switch circuit are default
Between T-phase etc. or the control of its difference within the specific limits.
In addition, although embodiment is separately illustrated and illustrated above, but it is related to the common technology in part, in ability
Domain those of ordinary skill apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and note is not known
The content of load, 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
Modifications, equivalent substitutions and improvements made within the spirit and principle of mode etc., should be included in the protection model of the technical scheme
Within enclosing.
Claims (14)
1. a kind of control method of on-off circuit, the on-off circuit includes first switch pipe, second switch pipe, the 3rd switch
The public affairs of pipe, the 4th switching tube and inductance, first switch pipe and second switch the pipe series connection, 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
Output end is connected to, the 4th switching tube is connected to ground, and the inductance connection is between first node and Section Point, its feature
It is, the control method includes：
When switch periods start, the first switch pipe and the 3rd switching tube conducting, the second switch pipe and described
4th switching tube is turned off,
When the inductive current is more than first threshold, then the first switch pipe and the 4th switching tube are turned off, and described second
Switching tube and the 3rd switching tube conducting, until inductive current is less than or equal to Second Threshold, then this switch periods terminates, and enters
Next switch periods；
When the inductive current is less than the 4th threshold value, then the first switch pipe and the 4th switching tube are turned on, and described second
Switching tube and the 3rd switching tube shut-off, until the inductive current is more than or equal to the 3rd threshold value, then this switch periods
Terminate, into next switch periods, wherein, the first threshold is more than or equal to the Second Threshold, and the 3rd threshold value is big
In equal to the 4th threshold value.
2. the control method of on-off circuit according to claim 1, it is characterised in that：The first threshold, second threshold
In value, the 3rd threshold value and the 4th threshold value, the Second Threshold is equal to the 3rd threshold value；Or the first threshold etc.
It is equal to the 3rd threshold value in the Second Threshold；Or the Second Threshold is equal to the 3rd threshold value and is equal to the 4th threshold
Value.
3. the control method of on-off circuit according to claim 1, it is characterised in that：The first threshold, second threshold
Value, the 3rd threshold value and the 4th threshold value are obtained by instruction current.
4. the control method of on-off circuit according to claim 3, it is characterised in that：The instruction current is by output feedback letter
Number and reference signal obtained after error is amplified.
5. the control method of on-off circuit according to claim 4, it is characterised in that the output feedback signal includes：
Output voltage feedback signal or output current feedback signal or power output feedback signal.
6. the control method of on-off circuit according to claim 3, it is characterised in that：The Second Threshold and the 3rd threshold
Value is equal to the instruction current, and the first threshold is the instruction current and difference current sum；4th threshold value is institute
State instruction current and subtract the difference current.
7. the control method of on-off circuit according to claim 6, it is characterised in that：The switch periods are more than first and made a reservation for
Time, then reduce the difference current；The switch periods are less than first scheduled time, then improve the difference current；
The switch periods are equal to first scheduled time, then the difference current is constant.
8. the control method of on-off circuit according to claim 6, it is characterised in that：The first switch pipe and the described 3rd
Switching tube is turned on, and the second switch pipe and the 4th switching tube shut-off, the state duration reached for second scheduled time,
When the inductive current is more than the instruction current, then the first switch pipe and the 4th switching tube shut-off, described
Second switch pipe and the 3rd switching tube conducting, until inductive current is less than or equal to instruction current, then this switch periods terminates,
Into next switch periods；
When the inductive current is less than the instruction current, then the first switch pipe and the 4th switching tube conducting, described
Second switch pipe and the 3rd switching tube shut-off, until the inductive current is more than or equal to the instruction current, then this is switched
End cycle, into next switch periods.
9. a kind of control circuit of on-off circuit, the on-off circuit includes first switch pipe, second switch pipe, the 3rd switch
The public affairs of pipe, the 4th switching tube and inductance, first switch pipe and second switch the pipe series connection, 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
Output end is connected to, the 4th switching tube is connected to ground, and the inductance connection is between first node and Section Point, its feature
It is, the control circuit includes：
Inductive current controls circuit；
Inductor current signal, first threshold, Second Threshold, the 3rd threshold value and the 4th threshold value are connected to the inductive current control electricity
The input on road, the inductive current control circuit output switching signal；
When switch periods start, the inductive current control circuit controls the first switch pipe and the 3rd switching tube to lead
It is logical, the second switch pipe and the 4th switching tube shut-off,
When the inductive current controls electric circuit inspection to be more than first threshold to the inductive current, then the inductive current control is electric
Road controls the first switch pipe and the 4th switching tube shut-off, the second switch pipe and the 3rd switching tube conducting,
Until the inductive current controls electric circuit inspection to be less than or equal to Second Threshold to the inductive current, then this switch periods terminates,
Into next switch periods；
When the inductive current controls electric circuit inspection to be less than the 4th threshold value to the inductive current, then the inductive current control is electric
Road controls the first switch pipe and the 4th switching tube conducting, the second switch pipe and the 3rd switching tube shut-off,
Until inductive current control electric circuit inspection to the inductive current more than or equal to the 3rd threshold value, then this switch periods knot
Beam, into next switch periods, wherein, the first threshold is more than or equal to the Second Threshold, and the 3rd threshold value is more than
Equal to the 4th threshold value.
10. the control circuit of on-off circuit according to claim 9, it is characterised in that the Second Threshold is equal to described the
Three threshold values are equal to instruction current.
11. the control circuit of on-off circuit according to claim 10, it is characterised in that the control circuit also includes：
First amplifier, error amplification output feedback signal and reference signal, obtain the instruction current.
12. the control circuit of on-off circuit according to claim 11, it is characterised in that the control circuit also includes：
Adder, its input connects the instruction current and difference current, and its output end is the first threshold, described first
Threshold value is the instruction current and the difference current sum；
Subtracter, its input connects the instruction current and the difference current, and its output end is the 4th threshold value, described
4th threshold value is that the instruction current subtracts the difference current.
13. the control circuit of on-off circuit according to claim 12, it is characterised in that the control circuit also includes：
Difference current adjusts circuit, and switching signal is connected to its input, and its output end exports the difference current, the switch
Cycle was more than for first scheduled time, reduced the difference current；The switch periods are less than first scheduled time, improve institute
State difference current；The switch periods are equal to first scheduled time, then the difference current is constant.
14. a kind of on-off circuit, it is characterised in that：Including controlling circuit as described in claim 9~13 any one.
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| CN2017100797455 | 2017-02-15 | ||
| CN201710079745 | 2017-02-15 |
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| CN201720385728.XU Active CN207459996U (en) | 2017-02-15 | 2017-04-13 | The control circuit and on-off circuit of a kind of on-off circuit |
| CN201710240190.8A Active CN107070216B (en) | 2017-02-15 | 2017-04-13 | Control method and control circuit of switching circuit and switching circuit |
| CN201710347635.2A Active CN107123969B (en) | 2017-02-15 | 2017-05-17 | Output protection circuit and method |
| CN201711444591.1A Pending CN108111019A (en) | 2017-02-15 | 2017-12-27 | A kind of control method of on-off circuit, control circuit and on-off circuit |
| CN201721863654.2U Active CN207732644U (en) | 2017-02-15 | 2017-12-27 | A kind of control circuit and switching circuit of switching circuit |
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| CN201711444591.1A Pending CN108111019A (en) | 2017-02-15 | 2017-12-27 | A kind of control method of on-off circuit, control circuit and on-off circuit |
| CN201721863654.2U Active CN207732644U (en) | 2017-02-15 | 2017-12-27 | A kind of control circuit and switching circuit of switching circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110165916A (en) * | 2019-04-16 | 2019-08-23 | 杰华特微电子（杭州）有限公司 | Control circuit, control method and the wireless charging transmitter using it of switching circuit |
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| CN207459996U (en) * | 2017-02-15 | 2018-06-05 | 杰华特微电子（杭州）有限公司 | The control circuit and on-off circuit of a kind of on-off circuit |
| CN109066579B (en) * | 2018-09-20 | 2020-02-07 | 重庆惠科金渝光电科技有限公司 | Overvoltage protection method and device |
| CN109742943B (en) * | 2019-01-02 | 2021-01-08 | 成都芯源系统有限公司 | Control circuit and control method of buck-boost type switch circuit |
| CN110224599A (en) * | 2019-05-31 | 2019-09-10 | 中北大学 | A kind of multiphase buck-boost alternation parallel DC/DC translation circuit |
| CN110399031A (en) * | 2019-06-28 | 2019-11-01 | 武汉高德红外股份有限公司 | The method and board of power consumption are reduced based on integrated form boost-buck power chip |
| CN111509968B (en) * | 2020-04-28 | 2021-10-19 | 重庆斯微奇电子技术有限公司 | Switching power supply output voltage control circuit |
| CN113364040B (en) * | 2021-07-22 | 2022-09-16 | 山东鲁软数字科技有限公司智慧能源分公司 | Photovoltaic grid-connected automatic voltage stabilization control device and method |
| CN114094826B (en) * | 2021-09-10 | 2022-09-30 | 珠海智融科技股份有限公司 | Method, system, equipment and medium for improving efficiency of buck-boost controller |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107070216B (en) | 2023-06-23 |
| CN207732644U (en) | 2018-08-14 |
| CN108111019A (en) | 2018-06-01 |
| CN207459996U (en) | 2018-06-05 |
| CN107123969B (en) | 2019-11-29 |
| CN107123969A (en) | 2017-09-01 |
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