CN106300972A - The control method of a kind of on-off circuit, control circuit and switch circuit devices - Google Patents
The control method of a kind of on-off circuit, control circuit and switch circuit devices Download PDFInfo
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- CN106300972A CN106300972A CN201610777865.8A CN201610777865A CN106300972A CN 106300972 A CN106300972 A CN 106300972A CN 201610777865 A CN201610777865 A CN 201610777865A CN 106300972 A CN106300972 A CN 106300972A
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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
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
Abstract
The invention discloses the control method of a kind of on-off circuit, control circuit and switch circuit devices, the present invention begins to turn on beginning timing from the first switching tube, conducting is terminated as the period 1, it is judged that whether the period 1 reached for first scheduled time to same cycle the second power tube；When the period 1 is more than first scheduled time, then reduce the bound difference of instruction inductive current, and adjust the switching frequency of on-off circuit according to the instruction higher limit of inductive current, lower limit and sampling inductive current；When the period 1 was not up to for first scheduled time, then improve the bound difference of instruction inductive current, and the switching frequency of on-off circuit is adjusted according to the instruction higher limit of inductive current, lower limit and sampling inductive current, thus period 1 of controlling on-off circuit is equal with the first Preset Time or its difference controls within the specific limits, it is achieved on-off circuit determine frequency.
Description
Technical field
The present invention relates to circuit engineering field, particularly relate to the control method of a kind of on-off circuit, control circuit and switch
Circuit arrangement.
Background technology
In the on-off circuit of current switch power supply, control output voltage by the on, off controlling switching tube.Institute
State on-off circuit and include BUCK (blood pressure lowering) circuit, BOOST (boosting) circuit etc..Wherein, Fig. 1 is described BUCK (blood pressure lowering) circuit；
Fig. 2 is described BOOST (boosting) circuit.As it is shown in figure 1, described BUCK circuit includes the first switching tube M00, the second power tube
D00 and inductance L00, wherein, the first switching tube M00 is metal-oxide-semiconductor, and the second power tube D00 is fly-wheel diode, and Vin is BUCK electricity
The input voltage on road, Vout is the output voltage of BUCK circuit, by driving control circuit to control the first switching tube M00
System, in other embodiments, described second power tube D00 can also be devices, by driving control circuit to the
One switching tube, devices are controlled.As in figure 2 it is shown, described BOOST circuit generally include the first switching tube M01,
Second power tube D01 and inductance L01, wherein, the first switching tube M01 is metal-oxide-semiconductor, and the second power tube D01 is fly-wheel diode,
Vin is the input voltage of BOOST circuit, and Vout is the output voltage of BOOST circuit, by driving control circuit to the first switch
Pipe M01 is controlled, and in other embodiments, described second power tube D01 can also be devices, by driving
First switching tube, devices are controlled by control circuit.
Wherein as a example by BUCK circuit, during the first switching tube M00 conducting, inductive current rises；First switching tube M00 closes
Disconnected, during fly-wheel diode (or devices) conducting, inductive current declines.Fig. 3 is that in on-off circuit, the first switching tube is led
Messenger TON and the oscillogram of inductive current, as shown in Figure 3 a and Figure 3 b shows, the minimum of inductive current is more than 0, then on-off circuit
It is operated in continuous conduction mode (CCM), when the minimum of inductive current is 0, then circuit is operated in discontinuous conduction mode (DCM),
Wherein, when inductive current is 0, main metal-oxide-semiconductor and fly-wheel diode are both off.
In some application of on-off circuit, it is desirable to keep the period 1 T of the first switching tube and the second power tube as far as possible
Invariable, to prevent on-off circuit to be operated in other operating frequencies, other load circuits are produced impact.
Summary of the invention
It is an object of the invention to provide control method and the control circuit of a kind of on-off circuit, be used for stablizing the first switch
Pipe and the period 1 of the second power tube, it is to avoid other load circuits are produced impact.
For reaching above-mentioned purpose, the invention provides the control method of a kind of on-off circuit, described on-off circuit includes
One switching tube and the second power tube, on-off circuit converts input voltage into defeated by the conducting of described first switching tube with shutoff
Going out voltage to drive load, described control method includes:
Begin to turn on beginning timing from the first switching tube, terminate conducting as first week to same cycle the second power tube
Phase, it is judged that whether the period 1 reached for first scheduled time；
When the period 1 is more than first scheduled time, then reduce the bound difference of instruction inductive current, and according to instruction
The higher limit of inductive current, lower limit adjust the switching frequency of on-off circuit with sampling inductive current；
When the period 1 was not up to for first scheduled time, then the bound difference of raising instruction inductive current, and according to
The instruction higher limit of inductive current, lower limit and sampling inductive current adjust the switching frequency of on-off circuit.
Optionally, the described period 1 specifically includes more than the judgement step of first scheduled time: utilize timing circuit to enter
Row timing, when same cycle the second power tube terminates conducting, the timing voltage of timing circuit is more than the first predeterminated voltage, then
Show that the period 1 alreadyd more than for first scheduled time；The judgement step that the described period 1 was not up to for first scheduled time is concrete
Including: utilize timing circuit to carry out timing, when same cycle the second power tube terminates conducting, the timing voltage of timing circuit
Less than the first predeterminated voltage, then show that the period 1 was not up to for first scheduled time.
Optionally, opening of on-off circuit is adjusted according to the instruction higher limit of inductive current, lower limit with sampling inductive current
The method closing frequency includes: compared with the instruction higher limit of inductive current, lower limit by sampling inductive current, when sampling electricity
Inducing current reaches to instruct the higher limit of inductive current, the switching signal generation saltus step of the first switching tube so that inductive current reduces,
When sampling inductive current reaches to instruct the lower limit of inductive current, the switching signal generation saltus step of the first switching tube so that inductance
Electric current raises again.
The embodiment of the present invention additionally provides the control circuit of a kind of on-off circuit, and described on-off circuit includes the first switch
Pipe, on-off circuit converts input voltage into output voltage to drive load by the conducting of described first switching tube and shutoff,
Described control circuit includes:
Continuity signal timing circuit, obtains the switching signal of the first switching tube, begins to turn on from the first switching tube and starts meter
Time, terminate conducting as the period 1 to same cycle the second power tube, it is judged that whether the period 1 reaches the first pre-timing
Between, export judged result；
Instruction inductive current adjusts circuit, obtains instruction inductive current from on-off circuit, according to Continuity signal timing circuit
Judged result adjust instruction inductive current, when the period 1 more than first scheduled time time, then reduce instruction inductive current
Bound difference；When the period 1 was not up to for first scheduled time, then improve the bound difference of instruction inductive current；
Switch tube driving circuit, from on-off circuit obtain sampling inductive current, according to instruction inductive current higher limit, under
Limit value adjusts the switching frequency of on-off circuit with sampling inductive current.
Optionally, described Continuity signal timing circuit includes timing circuit and voltage comparator circuit；
Wherein, described timing circuit begins to turn on beginning timing from described first switching tube, to same cycle the second merit
When rate pipe terminates conducting, export timing voltage；
Described timing voltage and the first reference voltage are compared by described voltage comparator circuit, when timing voltage is more than first
Reference voltage, then show when the period 1 is more than first scheduled time；When timing voltage is less than the first reference voltage, then show to work as
Period 1 was not up to for first scheduled time, exported judged result.
Optionally, described instruction inductive current adjustment circuit includes: electric current bound difference regulation circuit, electric current regulation
Device, output voltage feedback circuit；
The described feedback input end of output voltage feedback circuit is connected with the load outputs of on-off circuit, obtains and switchs
The higher limit of the instruction inductive current that the inductive current of circuit is corresponding or lower limit, and adjust circuit as instruction inductive current
The first outfan；
The input of described electric current bound difference regulation circuit is connected with the outfan of Continuity signal timing circuit, passes through
Obtain the bound difference of the judged result regulating command inductive current of Continuity signal timing circuit；
Two inputs of described rheonome are poor with the outfan of output voltage feedback circuit, electric current bound respectively
The outfan of value regulation circuit is connected, and the outfan of described rheonome is defeated as instruct inductive current adjustment circuit second
Go out end, utilize lower limit or higher limit that described rheonome regulating command inductive current is corresponding.
Optionally, described rheonome is adder or subtractor, when described rheonome is adder, described
Output voltage feedback circuit obtains the lower limit of the instruction inductive current corresponding with the inductive current of on-off circuit, utilizes addition
Instruction inductive current is adjusted by device, obtains the higher limit of instruction inductive current；When described rheonome is subtractor,
Described output voltage feedback circuit obtains the higher limit of the instruction inductive current corresponding with the inductive current of on-off circuit, utilizes
Instruction inductive current is adjusted by subtractor, obtains the lower limit of instruction inductive current.
Optionally, described switch tube driving circuit and instruction inductive current adjust the first outfan of circuit, the second output
End is connected, and obtains higher limit and the lower limit of instruction inductive current, and described switch tube driving circuit is also connected with on-off circuit, obtains
Take the sampling inductive current that the inductive current of on-off circuit is corresponding, according to the instruction higher limit of inductive current, lower limit and sampling
Inductive current adjusts the switching signal of the first switching tube of on-off circuit.
Optionally, sampling inductive current is compared with the instruction higher limit of inductive current, lower limit, when sampling inductance
Electric current reaches to instruct the higher limit of inductive current, the switching signal generation saltus step of the first switching tube so that inductive current reduces, when
Sampling inductive current reaches to instruct the lower limit of inductive current, the switching signal generation saltus step of the first switching tube so that inductance electricity
Stream gravity newly raises, and is regulated the switching frequency of on-off circuit by the switching signal regulating the first switching tube.
The embodiment of the present invention additionally provides a kind of switch circuit devices with described control circuit.
The present invention having the beneficial effects that compared to prior art:
The present invention begins to turn on beginning timing from the first switching tube, terminates to turn on conduct to same cycle the second power tube
Period 1, it is judged that whether the period 1 reached for first scheduled time, export judged result, and control circuit is from on-off circuit
Outfan obtains instruction inductive current, adjusts instruction inductive current according to described judged result, and utilizes the electricity of the instruction after adjustment
The upper lower limit value of inducing current compares with sampling inductive current, adjusts the switch time of the first switching tube, thus controls switch
The period 1 of circuit is equal with the first Preset Time or its difference controls within the specific limits, it is achieved fixed frequency.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, embodiment will be described below
The accompanying drawing used required in is briefly described, it should be apparent that, the accompanying drawing in describing below is only some of the present invention
Embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to attached according to these
Figure obtains other accompanying drawing.
Fig. 1 is the circuit diagram of BUCK circuit of the prior art；
Fig. 2 is the circuit diagram of BOOST circuit of the prior art；
Fig. 3 a is the BUCK circuit of the prior art sequential chart when being operated in continuous conduction mode；
Fig. 3 b is the BUCK circuit of the prior art sequential chart when being operated in discontinuous conduction mode；
Fig. 4 is the electrical block diagram of the control circuit of the on-off circuit of first embodiment of the invention；
Fig. 5 is the electrical block diagram of the control circuit of the on-off circuit of second embodiment of the invention；
Fig. 6 is the electrical block diagram of the timing circuit of the embodiment of the present invention；
Fig. 7 is the electrical block diagram of the electric current bound difference regulation circuit of the embodiment of the present invention；
Fig. 8 is the sequential chart of the control circuit of the on-off circuit of the embodiment of the present invention；
Fig. 9 is the schematic flow sheet of the control method of the on-off circuit of the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is a part of embodiment of the present invention rather than whole embodiments wholely.Based on this
Embodiment in bright, the every other enforcement that those of ordinary skill in the art are obtained under not making creative work premise
Example, broadly falls into the scope of protection of the invention.
Embodiment one
The embodiment of the present invention provide firstly a kind of switch circuit devices, described switch circuit devices include control circuit and
On-off circuit, described control circuit is connected with on-off circuit, for controlling period 1 and first Preset Time of on-off circuit
Equal or its difference controls within the specific limits, and under continuous conduction mode (CCM), the described period 1 is that the first switching tube is opened
Begin to turn on and start timing, terminate the time sum of conducting to same cycle the second power tube, be simultaneously equal to adjacent twice first
Time between switching tube Continuity signal rising edge/trailing edge；Under discontinuous conduction mode (DCM), the described period 1 is
One switching tube begins to turn on beginning timing, terminates the time sum of conducting to same cycle the second power tube, is inductance electricity
Stream ascent stage and the total time of decline stage, described total time less than adjacent twice first switching tube Continuity signal rising edges/
Time between trailing edge.And in embodiments of the present invention, the same cycle is the upper of the switching signal from the first switching tube
Rising along to the trailing edge of switching signal, and then the rising edge of the second power tube correspondence switching signal is under correspondence switching signal
Fall is along the corresponding cycle.
In the present embodiment, refer to Fig. 4, described on-off circuit as a example by BUCK circuit to control circuit and on-off circuit
Circuit connecting relation illustrate.In other embodiments, those skilled in the art can be easy to replace to BUCK circuit
Other on-off circuits, do not repeat at this.
Described on-off circuit includes: the first switching tube M00, the second power tube D00 and inductance L00, wherein, and the first switching tube
M00 can be metal-oxide-semiconductor or other controlled tr tubes, and the second power tube D00 is fly-wheel diode, and Vin is the input of on-off circuit
Voltage, Vout is the output voltage of on-off circuit, by driving control circuit to be controlled, the first switching tube M00 at other
In embodiment, described second power tube D00 can also be devices, by driving control circuit to the first switching tube
M00, devices are controlled.
Refer to Fig. 4, the control circuit of described on-off circuit includes that instructing inductive current adjusts circuit 10, Continuity signal meter
Time circuit 20, switch tube driving circuit 30.
Described instruction inductive current adjusts circuit 10 and includes: output voltage feedback circuit 11, electric current bound difference regulate
Circuit U 05, rheonome.
Described output voltage feedback circuit 11 includes the first divider resistance R01, the second divider resistance R02, operational amplifier
U00, the first Voltage-current conversion circuit U01, the load outputs of on-off circuit is by the first divider resistance R01 and the second dividing potential drop electricity
Dividing potential drop end between resistance R02 is connected with the first input end of amplifier U00, and the second input of described amplifier U00 connects the first ginseng
Examine voltage Vref1, the voltage V of the outfan of described amplifier U00CThrough the first Voltage-current conversion circuit U01, obtain instructing inductance electricity
The lower limit of stream.Described instruction inductive current lower limit can be the value less than 0.
Described output voltage feedback circuit 11 utilizes the first divider resistance R01 and the second divider resistance R02 to obtain load electricity
The feedback voltage V of pressureFBAfter, by feedback voltage VFBWith the first reference voltage Vref1Compare, and by output voltage through first
The lower limit being converted to instruction inductive current of Voltage-current conversion circuit U01, by adjusting the higher limit of instruction inductive current
And lower limit so that on-off circuit period 1 change, load voltage changes, and obtains new feedback electricity simultaneously
Pressure VFB, compare output comparison signal further, until feedback voltage VFBEqual to the first reference voltage Vref1。
Described electric current bound difference regulation circuit U 05 is connected with the outfan of Continuity signal timing circuit 20, and acquisition is led
The judged result of messenger timing circuit 20 output, according to when same cycle the second power tube terminates conducting, if arrive
First scheduled time, adjust the bound difference of instruction inductive current.
In the present embodiment, please also refer to Fig. 4, Fig. 7 and Fig. 8, the tool of described electric current bound difference regulation circuit U 05
Body circuit includes: the second current source I40, the 3rd current source I41, the first control switch K40, the second control switch K41, the second electricity
Holding C40, the second Voltage-current conversion circuit U40, described first controls the electricity controlling end and Continuity signal timing circuit of switch K40
Pressure ratio is connected compared with the UP signal output part of circuit U 03, and described second controls control end and the Continuity signal timing circuit of switch K41
The DOWN signal output part of the voltage comparator circuit U03 of 20 is connected, described second current source I40, the first control switch K40 series connection
Form the first series circuit, formation in parallel with the second electric capacity C40 after described 3rd current source I41, the second control switch K41 series connection
Second parallel circuit, described first series circuit and the connection of the second parallel circuit in series and junction point and the second voltage turn electric current electricity
The input of road U40 is connected, and the outfan of described second Voltage-current conversion circuit U40 regulates circuit as electric current bound difference
The outfan of U05.
When Continuity signal timing circuit judges to terminate conducting when same cycle the second power tube, predetermined more than first
During the time, the UP output signal of voltage comparator circuit U03 controls first switch K40 and turns off, and DOWN output signal makes the second control
System switch K41 turns on a period of time, turns off, thus the electric charge on the second electric capacity C40 bleeds off a part, reduce and connect
Point voltage V2, junction point voltage V2 is converted into the bound difference of instruction inductive current by Voltage-current conversion circuit by a certain percentage
Δ i, bound difference DELTA i of instruction inductive current reduces.
When Continuity signal timing circuit 20 judges that same cycle the second power tube terminates conducting, not up to first is pre-
When fixing time, then the DOWN output signal of voltage comparator circuit U03 controls second switch K41 and turns off, and UP output signal makes the
One controls switch K40 turns on a period of time, turns off, thus increases the electric charge on the second electric capacity C40, improves junction point electricity
Pressure V2, junction point voltage V2 is converted into bound difference DELTA i of instruction inductive current by Voltage-current conversion circuit by a certain percentage,
Bound difference DELTA i of instruction inductive current increases.
In the present embodiment, refer to Fig. 4, described rheonome is adder U02, described adder U02 respectively with
First Voltage-current conversion circuit U01 is connected, by the first Voltage-current conversion circuit U01 with electric current bound difference regulation circuit U 05
The lower limit of the instruction inductive current produced regulates the upper of the instruction inductive current of circuit U 05 generation plus electric current bound difference
Lower limit difference DELTA i, the higher limit of output order inductive current, the outfan of described adder U02 and switch tube driving circuit 30
Inductive current control circuit U06 be connected.
In other embodiments, refer to Fig. 5, described rheonome can also be subtractor U12, described subtractor
U12 regulates circuit U 05 with the first Voltage-current conversion circuit U01 and electric current bound difference respectively and is connected, and the first voltage turns electricity
The higher limit of the instruction inductive current that current circuit U01 produces deducts the instruction electricity that electric current bound difference regulation circuit U 05 produces
Bound difference DELTA i of inducing current, the lower limit of output order inductive current, the outfan of described subtractor U12 and switching tube
Inductive current control circuit U06 of drive circuit 30 is connected.
After described Continuity signal timing circuit 20 obtains the switching signal of the first switching tube M00, from the first switching tube M00's
Begin to turn on beginning timing, it is judged that same cycle the second power tube D00 terminates conducting, if reached for first scheduled time, defeated
Go out judged result.
Described Continuity signal timing circuit 10 includes timing circuit U04 and voltage comparator circuit U03, wherein, timing circuit
One end of U04 couples (not shown) with the control end of the first switching tube M00, obtains the switching signal of described first switching tube, institute
State timing circuit U04 and begin to turn on beginning timing from described first switching tube, when same cycle the second power tube terminates conducting
Time, export timing voltage.
Described voltage comparator circuit U03 is by described timing voltage and the second reference voltage Vref2Compare, when timing voltage
More than the first reference voltage Vref2, then show when same cycle the second power tube terminates conducting, more than first scheduled time
T；When timing voltage is less than the second reference voltage Vref2, then show, when same cycle the second power tube terminates conducting, not reach
To the first scheduled time T, export judged result.
Concrete, refer to Fig. 6, for the electrical block diagram of the timing circuit U04 of the embodiment of the present invention, described timing
Circuit U 04 includes: the first current source I20, the first charging capacitor C20 and the first charge switch pipe K20, described first current source
I20 is fixed current source or on-fixed current source, described first charging capacitor C20 and the first current source I20 series connection, and described the
One charging capacitor C20 and the first charge switch pipe K20 is in parallel, is opened the first charging by the switching signal of the first switching tube M00
Closing pipe K20 to be controlled, the voltage output end of described first charging capacitor C20 is as the outfan of timing circuit U04.In this reality
Execute in example, by adjusting the first current source I20 and the size of the first charging capacitor C20 so that at the first scheduled time T, first
Charging capacitor C20 can be charged to the second reference voltage V justref2.When the Continuity signal of the first switching tube M00 is long, first
The time that charge switch pipe K20 turns off is the longest, until same cycle the second power tube terminates conducting, now the first charged electrical
Holding the overlong time of C20 charging, now the voltage output end of the first charging capacitor C20 is exported timing by voltage comparator circuit U03
Voltage (crest voltage of the i.e. first charging capacitor C20) and the first reference voltage Vref1Compare, when timing voltage is more than the
One reference voltage Vref1, then show, when same cycle the second power tube terminates conducting, more than the first scheduled time T, to show
The period 1 of on-off circuit has exceeded the first scheduled time T, needs to reduce the period 1, exports judged result；When first opens
The Continuity signal closing pipe M00 is too short, and the time that the first charge switch pipe K20 turns off is too short, until same cycle the second power
Pipe terminates conducting, and now the time of the first charging capacitor C20 charging is too short, and now voltage comparator circuit U03 is by the first charged electrical
Hold timing voltage (crest voltage of the i.e. first charging capacitor C20) and the first reference voltage V of the voltage output end of C20ref1Enter
Row compares, when timing voltage is more than the first reference voltage Vref1, then show when same cycle the second power tube terminates conducting,
Not up to the first scheduled time T, shows that the period 1 of on-off circuit has been not up to the first scheduled time T, needs to improve first
In the cycle, export judged result.
The instruction inductive current that described switch tube driving circuit 30 adjusts circuit 20 output according to instruction inductive current adjusts
The ON time of the first switching tube of on-off circuit, when the bound difference of instruction inductive current reduces, according to instruction inductance electricity
The higher limit of stream, lower limit and sampling inductive current, then the ON time of the first switching tube reduces so that switching frequency uprises；
When the bound difference of instruction inductive current improves, according to the instruction higher limit of inductive current, lower limit and sampling inductive current,
Then the ON time of the first switching tube increases so that switching frequency step-down.
In the present embodiment, refer to Fig. 4 or Fig. 5, described switch tube driving circuit 30 includes inductive current control circuit
U06 and drive circuit U07, described inductive current control circuit U06 and instruction inductive current adjust the first outfan of circuit, the
Two outfans are connected, and obtain the instruction higher limit of inductive current and lower limit, described inductive current control circuit U06 also with switch
Circuit is connected, and obtains the sampling inductive current that the inductive current of on-off circuit is corresponding, and described sampling inductive current both can be split
The inductive current closing circuit is directly sampled acquisition, it is also possible to indirect by the electric current of sample the first switching tube and the second power tube
Obtain, according to the instruction higher limit of inductive current, lower limit and sampling inductive current, produce drive control signal, described driving
Control signal strengthens driving force to drive the first switching tube by drive circuit U07.
In other embodiments, described inductive current control circuit is connected with on-off circuit, obtains the inductance of on-off circuit
Sampling voltage corresponding to inductive current that electric current is corresponding, when the bound difference of instruction inductive current reduces, according to instruction inductance
The voltage that the higher limit of electric current, lower limit are corresponding with sampling inductive current, then the ON time of the first switching tube reduces so that open
Pass frequency uprises；When the bound difference of instruction inductive current improves, according to instructing the higher limit of inductive current, lower limit and adopting
The voltage that sample inductive current is corresponding, then the ON time of the first switching tube increases so that switching frequency step-down.
Wherein, opening of on-off circuit is regulated according to the instruction higher limit of inductive current, lower limit and sampling inductive current
The concrete mode closing frequency includes: compared, when adopting with the instruction higher limit of inductive current, lower limit by sampling inductive current
Sample inductive current reaches to instruct the higher limit of inductive current, the switching signal generation saltus step of the first switching tube so that inductive current
Reduce, when sampling inductive current reaches to instruct the lower limit of inductive current, the switching signal generation saltus step of the first switching tube so that
Inductive current raises again, is regulated the switching frequency of on-off circuit by the switching signal regulating the first switching tube.Corresponding
, the bound difference of inductive current is the biggest, and ON time or turn-off time that the first switching tube is corresponding are the longest, on-off circuit
Switching frequency the least；The bound difference of inductive current is the least, and ON time that the first switching tube is corresponding or turn-off time are also
The least, the switching frequency of on-off circuit is the biggest.
In other embodiments, when the second power tube of on-off circuit is devices, described switching tube drives electricity
Road adjusts the first outfan of circuit with instruction inductive current, the second outfan is connected, and obtains the higher limit of instruction inductive current
And lower limit, described switch tube driving circuit is also connected with on-off circuit, obtains the sampling that the inductive current of on-off circuit is corresponding
Inductive current, adjusts the first switch of on-off circuit according to the instruction higher limit of inductive current, lower limit and sampling inductive current
Pipe and the switching signal of devices, by the turn-on and turn-off time of the first switching tube as far as possible with the first Preset Time
Unanimously.
Wherein, opening of on-off circuit is regulated according to the instruction higher limit of inductive current, lower limit and sampling inductive current
The concrete mode closing frequency includes: compared, when adopting with the instruction higher limit of inductive current, lower limit by sampling inductive current
Sample inductive current reaches to instruct the higher limit of inductive current, and the switching signal of the first switching tube and devices is jumped
Change so that inductive current reduces, when sampling inductive current reaches to instruct the lower limit of inductive current, and the first switching tube is whole with synchronization
The switching signal generation saltus step of stream metal-oxide-semiconductor so that inductive current raises again, by regulating the first switching tube and synchronous rectification
The switching signal of metal-oxide-semiconductor regulates the switching frequency of on-off circuit.
Embodiment two
The embodiment of the present invention additionally provides the control method of a kind of on-off circuit, and described on-off circuit includes the first switch
Pipe, on-off circuit converts input voltage into output voltage to drive load by the conducting of described first switching tube and shutoff,
Refer to Fig. 9, described control method includes:
Step S101, begins to turn on beginning timing from the first switching tube, terminates conducting to same cycle the second power tube
As the period 1, it is judged that whether the period 1 reached for first scheduled time；
Step S102, when the period 1 is more than first scheduled time, then reduces the bound difference of instruction inductive current, and
The switching frequency of on-off circuit is adjusted according to the instruction higher limit of inductive current, lower limit and sampling inductive current；
Step S103, when the period 1 was not up to for first scheduled time, then the bound improving instruction inductive current is poor
Value, and the switching frequency of on-off circuit is adjusted according to the instruction higher limit of inductive current, lower limit and sampling inductive current.
Concrete, in the present embodiment, refer to by described control method is described as a example by the circuit of Fig. 4,
But the control method of the on-off circuit of the present invention is not limited to specific control circuit.
Perform step S101, begin to turn on beginning timing from the first switching tube, terminate to same cycle the second power tube
Conducting is as the period 1, it is judged that whether the period 1 reached for first scheduled time.
In the present embodiment, timing circuit U04 is utilized to begin to turn on beginning timing at the first switching tube, it is judged that same week
The time that phase the second power tube terminates to turn on is the period 1, it is judged that whether the period 1 reaches the first scheduled time T.
Refer to Fig. 6 and Fig. 7, when the Continuity signal of the first switching tube occurs, the first charge switch pipe K20 first turns on one
Fixing time, this time is considerably shorter than the first switching tube ON time, such as 30ns, in order to the upper voltage of the first charging capacitor C20 is multiple
Position is to 0.Subsequently the first charge switch pipe is disconnected, utilize the first current source I20 to the first charging capacitor C20 charging.Described
One current source I20 can be fixed current source, it is also possible to for on-fixed current source.In the present embodiment, by adjusting the first electricity
Stream source I20 and the size of the first charging capacitor C20 so that just can be filled at the first scheduled time T, the first charging capacitor C20
Electric to the first reference voltage Vref1.When the Continuity signal of the first switching tube M00 is long, first charge switch pipe K20 turn off time
Between the longest, until same cycle the second power tube terminate conducting, first charging capacitor C20 charging overlong time, now
Voltage comparator circuit U03 the voltage output end of the first charging capacitor C20 is exported timing voltage (the i.e. first charging capacitor C20's
Crest voltage) and the first reference voltage Vref1Compare, when timing voltage is more than the first reference voltage Vref1, then first is shown
Cycle is more than the first scheduled time T；When the Continuity signal of the first switching tube M00 is too short, first charge switch pipe K20 turn off time
Between too short, until same cycle the second power tube terminate conducting, first charging capacitor C20 charging time too short, now electricity
Pressure ratio compared with circuit U 03 by the timing voltage (peak value of the i.e. first charging capacitor C20 of the voltage output end of the first charging capacitor C20
Voltage) and the first reference voltage Vref1Compare, when timing voltage is less than the first reference voltage Vref1, then the period 1 is shown
Not up to the first scheduled time T.
Perform step S102, when the period 1 is more than first scheduled time, then the bound reducing instruction inductive current is poor
Value, and the switching frequency of on-off circuit is adjusted according to the instruction higher limit of inductive current, lower limit and sampling inductive current.
In the present embodiment, when the period 1 more than first scheduled time time, send judged result, electric current bound difference
Regulation circuit regulates electric current bound difference according to judged result, and utilizes adder or subtractor to obtain instruction inductive current
Higher limit and lower limit, switch tube driving circuit 30 utilizes the instruction higher limit of inductive current, lower limit and sampling inductive current
The switching signal of regulation switching tube, reduces the ON time of the first switching tube Continuity signal so that the switch letter of the first switching tube
Number cycle shorten, switching frequency uprises, such that it is able to control on-off circuit period 1 equal with the first Preset Time or
Its difference controls within the specific limits.
Concrete, sampling inductive current is compared with the instruction higher limit of inductive current, lower limit, when sampling inductance
Electric current reaches to instruct the higher limit of inductive current, the switching signal generation saltus step of the first switching tube so that inductive current reduces, when
Sampling inductive current reaches to instruct the lower limit of inductive current, the switching signal generation saltus step of the first switching tube so that inductance electricity
Stream gravity newly raises, and is regulated the switching frequency of on-off circuit by the switching signal regulating the first switching tube.
When described on-off circuit includes the first switching tube and devices, according to instruction inductive current higher limit,
Lower limit includes with the method for the switching frequency that sampling inductive current adjusts on-off circuit: will sampling inductive current and instruction inductance
The higher limit of electric current, lower limit compare, when sampling inductive current reaches to instruct the higher limit of inductive current, the first switching tube
Switching signal generation saltus step with devices so that inductive current reduces, when sampling inductive current reaches to instruct inductance
The lower limit of electric current, the switching signal generation saltus step of the first switching tube and devices so that inductive current rises again
Height, regulates the switching frequency of on-off circuit by the switching signal regulating the first switching tube and devices.
Perform step S103, when the period 1 was not up to for first scheduled time, then improve the upper and lower of instruction inductive current
Limit difference, and the switching frequency of on-off circuit is adjusted according to the instruction higher limit of inductive current, lower limit and sampling inductive current.
In the present embodiment, when the period 1 was not up to for first scheduled time, sending judged result, electric current bound is poor
Value regulation circuit regulates electric current bound difference according to judged result, and utilizes adder or subtractor to obtain instruction inductive current
Higher limit and lower limit, switch tube driving circuit 30 utilizes the instruction higher limit of inductive current, lower limit and on-off circuit to obtain
The switching signal of the sampling inductive current regulation switching tube taken, improves the ON time of the first switching tube Continuity signal so that the
The cycle of the switching signal of one switching tube is elongated, switching frequency step-down, such that it is able to control the period 1 and the of on-off circuit
One Preset Time is equal or its difference controls within the specific limits.
Concrete, sampling inductive current is compared with the instruction higher limit of inductive current, lower limit, when sampling inductance
Electric current reaches to instruct the higher limit of inductive current, the switching signal generation saltus step of the first switching tube so that inductive current reduces, when
Sampling inductive current reaches to instruct the lower limit of inductive current, the switching signal generation saltus step of the first switching tube so that inductance electricity
Stream gravity newly raises, and is regulated the switching frequency of on-off circuit by the switching signal regulating the first switching tube.
When described on-off circuit includes the first switching tube and devices, according to instruction inductive current higher limit,
Lower limit includes with the method for the switching frequency that sampling inductive current adjusts on-off circuit: will sampling inductive current and instruction inductance
The higher limit of electric current, lower limit compare, when sampling inductive current reaches to instruct the higher limit of inductive current, the first switching tube
Switching signal generation saltus step with devices so that inductive current reduces, when sampling inductive current reaches to instruct inductance
The lower limit of electric current, the switching signal generation saltus step of the first switching tube and devices so that inductive current rises again
Height, regulates the switching frequency of on-off circuit by the switching signal regulating the first switching tube and devices.
The above, the only detailed description of the invention of the present invention, but protection scope of the present invention is not limited thereto, and any
Those familiar with the art, in the technical scope that the invention discloses, can readily occur in change or replace, should contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with described scope of the claims.
Claims (10)
1. a control method for on-off circuit, described on-off circuit includes the first switching tube and the second power tube, on-off circuit
Output voltage is converted input voltage into drive load by the conducting of described first switching tube and shutoff, it is characterised in that
Described control method includes:
Begin to turn on beginning timing from the first switching tube, terminate to turn on as the period 1 to same cycle the second power tube,
Judge whether the period 1 reached for first scheduled time；
When the period 1 is more than first scheduled time, then reduce the bound difference of instruction inductive current, and according to instruction inductance
The higher limit of electric current, lower limit adjust the switching frequency of on-off circuit with sampling inductive current；
When the period 1 was not up to for first scheduled time, then improve the bound difference of instruction inductive current, and according to instruction
The higher limit of inductive current, lower limit adjust the switching frequency of on-off circuit with sampling inductive current.
2. the control method of on-off circuit as claimed in claim 1, it is characterised in that the described period 1 is predetermined more than first
The judgement step of time specifically includes: utilize timing circuit to carry out timing, when same cycle the second power tube terminates conducting,
The timing voltage of timing circuit is more than the first predeterminated voltage, then show that the period 1 alreadyd more than for first scheduled time；Described
The judgement step of not up to first scheduled time of one cycle specifically includes: utilize timing circuit to carry out timing, when the same cycle
When second power tube terminates conducting, the timing voltage of timing circuit is less than the first predeterminated voltage, then show that the period 1 is not up to
First scheduled time.
3. the control method of on-off circuit as claimed in claim 1, it is characterised in that according to the upper limit of instruction inductive current
Value, lower limit include with the method for the switching frequency that sampling inductive current adjusts on-off circuit: will sampling inductive current and instruction
The higher limit of inductive current, lower limit compare, when sampling inductive current reaches to instruct the higher limit of inductive current, and first opens
Close the switching signal generation saltus step of pipe so that inductive current reduces, when sampling inductive current reaches to instruct the lower limit of inductive current
Value, the switching signal generation saltus step of the first switching tube so that inductive current raises again.
4. a control circuit for on-off circuit, described on-off circuit includes the first switching tube, and on-off circuit passes through described first
The conducting of switching tube and shutoff convert input voltage into output voltage to drive load, it is characterised in that described control circuit
Including:
Continuity signal timing circuit, obtains the switching signal of the first switching tube, begins to turn on beginning timing from the first switching tube, arrives
Same cycle the second power tube terminates conducting as the period 1, it is judged that whether the period 1 reached for first scheduled time, defeated
Go out judged result；
Instruction inductive current adjusts circuit, obtains instruction inductive current from on-off circuit, according to sentencing of Continuity signal timing circuit
Disconnected result adjusts instruction inductive current, when the period 1 more than first scheduled time time, then reduce the upper and lower of instruction inductive current
Limit difference；When the period 1 was not up to for first scheduled time, then improve the bound difference of instruction inductive current；
Switch tube driving circuit, obtains sampling inductive current from on-off circuit, according to the instruction higher limit of inductive current, lower limit
With the switching frequency that sampling inductive current adjusts on-off circuit.
The control circuit of on-off circuit the most according to claim 4, it is characterised in that described Continuity signal timing circuit bag
Include timing circuit and voltage comparator circuit；
Wherein, described timing circuit begins to turn on beginning timing from described first switching tube, to same cycle the second power tube
When terminating conducting, export timing voltage；
Described timing voltage and the first reference voltage are compared by described voltage comparator circuit, when timing voltage is more than the first reference
Voltage, then show when the period 1 is more than first scheduled time；When timing voltage is less than the first reference voltage, then show when first
Cycle was not up to for first scheduled time, exported judged result.
The control circuit of on-off circuit the most according to claim 4, it is characterised in that described instruction inductive current adjusts electricity
Road includes: electric current bound difference regulation circuit, rheonome, output voltage feedback circuit；
The described feedback input end of output voltage feedback circuit is connected with the load outputs of on-off circuit, obtains and on-off circuit
The corresponding instruction higher limit of inductive current of inductive current or lower limit, and as the of instruction inductive current adjustment circuit
One outfan；
The input of described electric current bound difference regulation circuit is connected with the outfan of Continuity signal timing circuit, by obtaining
The bound difference of the judged result regulating command inductive current of Continuity signal timing circuit；
Two inputs of described rheonome are adjusted with the outfan of output voltage feedback circuit, electric current bound difference respectively
The outfan on economize on electricity road is connected, and the outfan of described rheonome adjusts the second output of circuit as instruction inductive current
End, utilizes lower limit or higher limit that described rheonome regulating command inductive current is corresponding.
The control circuit of on-off circuit the most according to claim 6, it is characterised in that described rheonome is adder
Or subtractor, when described rheonome is adder, described output voltage feedback circuit obtains the inductance with on-off circuit
The lower limit of the instruction inductive current that electric current is corresponding, utilizes adder to be adjusted instruction inductive current, obtains instruction electricity
The higher limit of inducing current；When described rheonome is subtractor, described output voltage feedback circuit obtains and on-off circuit
Inductive current corresponding instruction inductive current higher limit, utilize subtractor to instruction inductive current be adjusted, obtain
The lower limit of instruction inductive current.
8. according to the control circuit of the on-off circuit described in claim 6 or 7, it is characterised in that described switch tube driving circuit
Adjust the first outfan of circuit, the second outfan with instruction inductive current to be connected, obtain the higher limit of instruction inductive current with
Lower limit, described switch tube driving circuit is also connected with on-off circuit, obtains the sampling electricity that the inductive current of on-off circuit is corresponding
Inducing current, adjusts the first switching tube of on-off circuit according to the instruction higher limit of inductive current, lower limit and sampling inductive current
Switching signal.
The control circuit of on-off circuit the most according to claim 8, it is characterised in that will sampling inductive current and instruction electricity
The higher limit of inducing current, lower limit compare, when sampling inductive current reaches to instruct the higher limit of inductive current, the first switch
The switching signal generation saltus step of pipe so that inductive current reduces, when sampling inductive current reaches to instruct the lower limit of inductive current,
The switching signal generation saltus step of the first switching tube so that inductive current raises again, believes by regulating the switch of the first switching tube
Number regulate the switching frequency of on-off circuit.
10. one kind has the switch circuit devices of control circuit as described in claim 4～9 any one.
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| CN201610777865.8A CN106300972B (en) | 2016-08-31 | 2016-08-31 | A kind of control method of switching circuit, control circuit and switch circuit devices |
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| US11742750B2 (en) | 2021-10-11 | 2023-08-29 | Halo Microelectronics International | Boost converter apparatus and control method |
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