CN106300972B - A kind of control method of switching circuit, control circuit and switch circuit devices - Google Patents
A kind of control method of switching circuit, control circuit and switch circuit devices Download PDFInfo
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- CN106300972B CN106300972B CN201610777865.8A CN201610777865A CN106300972B CN 106300972 B CN106300972 B CN 106300972B CN 201610777865 A CN201610777865 A CN 201610777865A CN 106300972 B CN106300972 B CN 106300972B
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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 a kind of control method of switching circuit, control circuit and switch circuit devices, present invention timing since being begun to turn on first switch tube, terminate conducting as the period 1 to same the second power tube of period, judges whether the period 1 reached for the first predetermined time；It was more than the first predetermined time when the period 1, then reduces the bound difference of instruction inductive current, and according to the upper limit value of instruction inductive current, the switching frequency of lower limit value and sampling inductive current adjustment switching circuit；When the period 1 being not up to for the first predetermined time, then improve the bound difference of instruction inductive current, and according to the upper limit value of instruction inductive current, the switching frequency of lower limit value and sampling inductive current adjustment switching circuit, to which the period 1 of control switch circuit is equal with the first preset time or its difference controls in a certain range, that realizes switching circuit determines frequency.
Description
Technical field
The present invention relates to field of circuit technology more particularly to a kind of control methods of switching circuit, control circuit and switch
Circuit device.
Background technique
In the switching circuit of current switch power supply, output voltage is controlled by the on, off of control switch pipe.Institute
Stating switching circuit includes BUCK (decompression) circuit, BOOST (boosting) circuit etc..Wherein, Fig. 1 is the BUCK (decompression) circuit；
Fig. 2 is the BOOST (boosting) circuit.As shown in Figure 1, the BUCK circuit includes first switch tube M00, the second power tube
D00 and inductance L00, wherein first switch tube M00 is metal-oxide-semiconductor, and the second power tube D00 is freewheeling diode, and Vin is BUCK electricity
The input voltage on road, Vout are the output voltage of BUCK circuit, are controlled by drive control circuit to first switch tube M00
System, in other embodiments, the second power tube D00 may be devices, by drive control circuit to the
One switching tube, devices are controlled.As shown in Fig. 2, the BOOST circuit generally include first switch tube M01,
Second power tube D01 and inductance L01, wherein first switch tube M01 is metal-oxide-semiconductor, and the second power tube D01 is freewheeling diode,
Vin is the input voltage of BOOST circuit, and Vout is the output voltage of BOOST circuit, by drive control circuit to first switch
Pipe M01 is controlled, and in other embodiments, the second power tube D01 may be devices, passes through driving
Control circuit controls first switch tube, devices.
Wherein by taking BUCK circuit as an example, when first switch tube M00 is connected, inductive current rises；First switch tube M00 is closed
It is disconnected, when freewheeling diode (or devices) is connected, inductive current decline.Fig. 3 is that first switch tube is led in switching circuit
The waveform diagram of messenger TON and inductive current, as shown in Figure 3a and Figure 3b shows, the minimum of inductive current are greater than 0, then switching circuit
Work is at continuous conduction mode (CCM), and when the minimum of inductive current is 0, then circuit works at discontinuous conduction mode (DCM),
Wherein, when inductive current is 0, main metal-oxide-semiconductor and freewheeling diode are turned off.
In the certain applications of switching circuit, it is desirable to keep the period 1 T of first switch tube and the second power tube as far as possible
It is invariable, to prevent switching circuit work from having an impact in other working frequencies to other load circuits.
Summary of the invention
The purpose of the present invention is to provide a kind of control method of switching circuit and control circuits, for stablizing first switch
It the period 1 of pipe and the second power tube, avoids having an impact other load circuits.
In order to achieve the above objectives, the present invention provides a kind of control method of switching circuit, the switching circuit includes the
One switching tube and the second power tube, switching circuit are converted input voltage by the conducting of the first switch tube with shutdown defeated
To drive load, the control method includes: voltage out
The timing since being begun to turn on first switch tube terminates conducting as first week to same the second power tube of period
Phase, judge whether the period 1 reached for the first predetermined time；
It was more than the first predetermined time when the period 1, then reduces the bound difference of instruction inductive current, and according to instruction
Upper limit value, lower limit value and the sampling inductive current of inductive current adjust the switching frequency of switching circuit；
When the period 1 being not up to for the first predetermined time, then improve instruction inductive current bound difference, and according to
Instruct the upper limit value of inductive current, the switching frequency of lower limit value and sampling inductive current adjustment switching circuit.
Optionally, the period 1 is more than that the judgment step of the first predetermined time specifically includes: using timing circuit into
Row timing, when same the second power tube of period terminates conducting, the timing voltage of timing circuit is greater than the first predeterminated voltage, then
Show that the period 1 alreadyd exceed for the first predetermined time；The judgment step that the period 1 was not up to for the first predetermined time is specific
It include: to carry out timing using timing circuit, when same the second power tube of period 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 the first predetermined time.
Optionally, it is opened according to the upper limit value of instruction inductive current, lower limit value with sampling inductive current adjustment switching circuit
The method for closing frequency includes: that will sample inductive current to be compared with the upper limit value of inductive current, lower limit value is instructed, when sampling electricity
Inducing current reaches the upper limit value of instruction inductive current, and the switching signal of first switch tube jumps, so that inductive current reduces,
When sampling inductive current reaches the lower limit value of instruction inductive current, the switching signal of first switch tube is jumped, so that inductance
Electric current increases again.
The embodiment of the invention also provides a kind of control circuit of switching circuit, the switching circuit includes first switch
Pipe, switching circuit by the conducting of the first switch tube and shutdown convert input voltage into output voltage to drive and load,
The control circuit includes:
Continuity signal timing circuit obtains the switching signal of first switch tube, counts since being begun to turn on first switch tube
When, terminate conducting as the period 1 to same the second power tube of period, judges whether the period 1 reaches the first pre- timing
Between, export judging result；
Inductive current adjustment circuit is instructed, from switching circuit acquisition instruction inductive current, according to Continuity signal timing circuit
Judging result adjustment instruction inductive current then reduce instruction inductive current when the period 1 being more than the first predetermined time
Bound difference；When the period 1 being not up to for the first predetermined time, then the bound difference of instruction inductive current is improved；
Switch tube driving circuit, from switching circuit obtain sampling inductive current, according to instruction inductive current upper limit value, under
The switching frequency of limit value and sampling inductive current adjustment switching circuit.
Optionally, the Continuity signal timing circuit includes timing circuit and voltage comparator circuit；
Wherein, same the second function of period is arrived in timing circuit timing since being begun to turn on the first switch tube
When rate pipe terminates conducting, timing voltage is exported；
The voltage comparator circuit compares the timing voltage with the first reference voltage, when timing voltage is greater than second
Reference voltage then shows that when the period 1 be more than the first predetermined time；When timing voltage is less than the second reference voltage, then show to work as
Period 1 was not up to for the first predetermined time, exported judging result.
Optionally, described instruction inductive current adjustment circuit includes: that electric current bound difference adjusts circuit, current regulation
Device, output voltage feed circuit；
The feedback input end of the output voltage feed circuit is connected with the load outputs of switching circuit, obtains and switchs
The upper limit or lower limit of the corresponding instruction inductive current of the inductive current of circuit, and as instruction inductive current adjustment circuit
The first output end；
The input terminal that the electric current bound difference adjusts circuit is connected with the output end of Continuity signal timing circuit, passes through
Obtain the bound difference of the judging result regulating command inductive current of Continuity signal timing circuit；
Two input terminals of the current regulator are poor with the output end of output voltage feed circuit, electric current bound respectively
The output end that value adjusts circuit is connected, and the output end of the current regulator is as instructing the second defeated of inductive current adjustment circuit
Outlet utilizes the corresponding lower limit value of the current regulator regulating command inductive current or upper limit value.
Optionally, the current regulator be adder or subtracter, when the current regulator be adder when, it is described
Output voltage feed circuit obtains the lower limit value of instruction inductive current corresponding with the inductive current of switching circuit, utilizes addition
Instruction inductive current is adjusted in device, the upper limit value of acquisition instruction inductive current；When the current regulator is subtracter,
The output voltage feed circuit obtains the upper limit value of instruction inductive current corresponding with the inductive current of switching circuit, utilizes
Instruction inductive current is adjusted in subtracter, the lower limit value of acquisition instruction inductive current.
Optionally, the switch tube driving circuit and the first output end of instruction inductive current adjustment circuit, the second output
End is connected, and the upper limit value and lower limit value of acquisition instruction inductive current, the switch tube driving circuit are also connected with switching circuit, obtain
The corresponding sampling inductive current of the inductive current of switching circuit is taken, according to upper limit value, lower limit value and the sampling of instruction inductive current
Inductive current adjusts the switching signal of the first switch tube of switching circuit.
Optionally, inductive current will be sampled to be compared with the upper limit value of inductive current, lower limit value is instructed, when sampling inductance
Electric current reaches the upper limit value of instruction inductive current, and the switching signal of first switch tube jumps, so that inductive current reduces, when
Sampling inductive current reaches the lower limit value of instruction inductive current, and the switching signal of first switch tube jumps, so that inductance is electric
Stream increases again, by adjusting the switching signal of first switch tube come the switching frequency of regulating switch circuit.
The embodiment of the invention also provides a kind of switch circuit devices with the control circuit.
The present invention is compared to the beneficial effect of the prior art:
Present invention timing since being begun to turn on first switch tube terminates that conduct is connected to same the second power tube of period
Period 1, judge whether the period 1 reaches the first predetermined time, output judging result, and control circuit from switching circuit
Output end obtains instruction inductive current, according to the judging result adjustment instruction inductive current, and utilizes instruction electricity adjusted
The upper lower limit value of inducing current is compared with sampling inductive current, the switch time of first switch tube is adjusted, thus control switch
The period 1 of circuit is equal with the first preset time or its difference controls in a certain range, realizes fixed frequency.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, embodiment will be described below
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without creative efforts, can also be attached according to these
Figure obtains other attached drawings.
Fig. 1 is the circuit diagram of BUCK circuit in the prior art；
Fig. 2 is the circuit diagram of BOOST circuit in the prior art；
Fig. 3 a is the timing diagram that BUCK circuit in the prior art works in continuous conduction mode；
Fig. 3 b is the timing diagram that BUCK circuit in the prior art works in discontinuous conduction mode；
Fig. 4 is the electrical block diagram of the control circuit of the switching circuit of first embodiment of the invention；
Fig. 5 is the electrical block diagram of the control circuit of the switching 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 that the electric current bound difference of the embodiment of the present invention adjusts the electrical block diagram of circuit；
Fig. 8 is the timing diagram of the control circuit of the switching circuit of the embodiment of the present invention；
Fig. 9 is the flow diagram of the control method of the switching circuit of the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
Embodiment one
The embodiment of the present invention provides firstly a kind of switch circuit devices, the switch circuit devices include control circuit and
Switching circuit, the control circuit are connected with switching circuit, period 1 and the first preset time for control switch circuit
The control of equal or its difference in a certain range, at continuous conduction mode (CCM), open for first switch tube by the period 1
Conducting of beginning starts timing, terminates the sum of time of conducting to same the second power tube of period, while being equal to adjacent twice first
Time between switching tube Continuity signal rising edge/failing edge；At discontinuous conduction mode (DCM), the period 1 is the
One switching tube begins to turn on beginning timing, terminates the sum of the time of conducting to same the second power tube of period, as inductance electricity
Flow ascent stage and decline stage total time, the total time be less than the adjacent Continuity signal of first switch tube twice rising edge/
Time between failing edge.And in embodiments of the present invention, the same period is from the upper of the switching signal of first switch tube
It rises along the failing edge for arriving switching signal, and then the second power tube correspond under the rising edge of switching signal to correspondence switching signal
Drop is along the corresponding period.
In the present embodiment, referring to FIG. 4, the switching circuit by taking BUCK circuit as an example to control circuit and switching circuit
Circuit connecting relation be illustrated.In other embodiments, those skilled in the art can be easy to for BUCK circuit being substituted for
Other switching circuits, this will not be repeated here.
The switching circuit includes: first switch tube M00, the second power tube D00 and inductance L00, wherein first switch tube
M00 can be metal-oxide-semiconductor or other controlled tr tubes, and the second power tube D00 is freewheeling diode, and Vin is the input of switching circuit
Voltage, Vout are the output voltage of switching circuit, are controlled by drive control circuit first switch tube M00, at other
In embodiment, the second power tube D00 may be devices, by drive control circuit to first switch tube
M00, devices are controlled.
Referring to FIG. 4, the control circuit of the switching circuit includes instruction inductive current adjustment circuit 10, Continuity signal meter
When circuit 20, switch tube driving circuit 30.
Described instruction inductive current adjustment circuit 10 includes: output voltage feed circuit 11, the adjusting of electric current bound difference
Circuit U 05, current regulator.
The output voltage feed circuit 11 includes the first divider resistance R01, the second divider resistance R02, operational amplifier
U00, first voltage turn current circuit U01, and the load outputs of switching circuit pass through the partial pressure electricity of the first divider resistance R01 and second
Partial pressure end between resistance R02 is connected with the first input end of amplifier U00, the first ginseng of the second input terminal connection of the amplifier U00
Examine voltage Vref1, the voltage V of the output end of the amplifier U00CTurn current circuit U01 by first voltage, obtains instruction inductance electricity
The lower limit value of stream.Described instruction inductive current lower limit value can be the value less than 0.
The output voltage feed circuit 11 obtains load electricity using the first divider resistance R01 and the second divider resistance R02
The feedback voltage V of pressureFBAfterwards, by feedback voltage VFBWith the first reference voltage Vref1It is compared, and output voltage is passed through first
The lower limit value for being converted to instruction inductive current of Voltage-current conversion circuit U01, by adjusting the upper limit value of instruction inductive current
And lower limit value, so that the period 1 of switching circuit changes, load voltage changes, while obtaining new feedback electricity
Press VFB, further progress compares output comparison signal, until feedback voltage VFBEqual to the first reference voltage Vref1。
The electric current bound difference adjusts circuit U 05 and is connected with the output end of Continuity signal timing circuit 20, and acquisition is led
The judging result that messenger timing circuit 20 exports, according to when same the second power tube of period terminates conducting, if reach
First predetermined time, the bound difference of adjustment instruction inductive current.
In the present embodiment, please also refer to Fig. 4, Fig. 7 and Fig. 8, the electric current bound difference adjusts the tool of circuit U 05
Body circuit includes: the second current source I40, third current source I41, the first control switch K40, the second control switch K41, the second electricity
Hold C40, second voltage turns current circuit U40, the control terminal of the first control switch K40 and the electricity of Continuity signal timing circuit
Pressure ratio is connected compared with the UP signal output end of circuit U 03, the control terminal and Continuity signal timing circuit of the second control switch K41
The DOWN signal output end of 20 voltage comparator circuit U03 is connected, the second current source I40, the first control switch K40 series connection
The first series circuit is formed, it is in parallel with the second capacitor C40 after the third current source I41, the second control switch K41 series connection to be formed
It is electric that second parallel circuit, first series circuit and the connection of the second parallel circuit in series and tie point and second voltage turn electric current
The input terminal of road U40 is connected, and the output end that the second voltage turns current circuit U40 adjusts circuit as electric current bound difference
The output end of U05.
When Continuity signal timing circuit is judged to make a reservation for when same the second power tube of period terminates conducting more than first
When the time, the UP output signal of voltage comparator circuit U03 turns off the first control switch K40, and DOWN output signal makes the second control
Switch K41 conducting a period of time is made, is then turned off again, so that the charge on the second capacitor C40 is bled off a part, reduces connection
Tie point voltage V2 is converted into the bound difference of instruction inductive current by point voltage V2, Voltage-current conversion circuit by a certain percentage
Δ i instructs the bound difference DELTA i of inductive current to reduce.
When Continuity signal timing circuit 20 judges that same the second power tube of period terminates conducting, not up to first is pre-
When fixing time, then the DOWN output signal of voltage comparator circuit U03 turns off the second control switch K41, and UP output signal makes
It one control switch K40 conducting a period of time, then turns off again, to increase the charge on the second capacitor C40, improves tie point electricity
V2 is pressed, tie point voltage V2 is converted into the bound difference DELTA i of instruction inductive current by Voltage-current conversion circuit by a certain percentage,
The bound difference DELTA i of inductive current is instructed to increase.
In the present embodiment, referring to FIG. 4, the current regulator be adder U02, the adder U02 respectively with
First voltage turns current circuit U01 and is connected with electric current bound difference adjusting circuit U 05, and first voltage is turned current circuit U01
The lower limit value of the instruction inductive current of generation instructs the upper of inductive current plus what electric current bound difference adjusting circuit U 05 generated
Lower limit difference DELTA i, the upper limit value of output order inductive current, the output end and switch tube driving circuit 30 of the adder U02
Inductive current control circuit U06 be connected.
In other embodiments, referring to FIG. 5, the current regulator can also be subtracter U12, the subtracter
U12 turns current circuit U01 with first voltage respectively and electric current bound difference adjusts circuit U 05 and is connected, and first voltage is turned electricity
The upper limit value for the instruction inductive current that current circuit U01 is generated subtracts electric current bound difference and adjusts the instruction electricity that circuit U 05 generates
The bound difference DELTA i of inducing current, the lower limit value of output order inductive current, the output end and switching tube of the subtracter U12
The inductive current control circuit U06 of driving circuit 30 is connected.
After the Continuity signal timing circuit 20 obtains the switching signal of first switch tube M00, from first switch tube M00's
Beginning timing is begun to turn on, judges that same the second power tube of period D00 terminates to be connected, if reached for the first predetermined time, it is defeated
Judging result out.
The Continuity signal timing circuit 10 includes timing circuit U04 and voltage comparator circuit U03, wherein timing circuit
One end of U04 and the control terminal of first switch tube M00 couple (not shown), obtain the switching signal of the first switch tube, institute
Timing circuit U04 timing since being begun to turn on the first switch tube is stated, when same the second power tube of period terminates to be connected
When, export timing voltage.
The voltage comparator circuit U03 is by the timing voltage and the second reference voltage Vref2It compares, when timing voltage
Greater than the second reference voltage Vref2, then show when same the second power tube of period terminates conducting, more than the first predetermined time
T；When timing voltage is less than the second reference voltage Vref2, then show not reach when same the second power tube of period terminates conducting
To the first predetermined time T, judging result is exported.
Specifically, referring to FIG. 6, the electrical block diagram of the timing circuit U04 for the embodiment of the present invention, the timing
Circuit U 04 includes: the first current source I20, the first charging capacitor C20 and the first charge switch pipe K20, first current source
I20 is fixed current source or on-fixed current source, and the first charging capacitor C20 connects with the first current source I20, and described the
One charging capacitor C20 is in parallel with the first charge switch pipe K20, is opened by the switching signal of first switch tube M00 the first charging
It closes pipe K20 to be controlled, output end of the voltage output end of the first charging capacitor C20 as timing circuit U04.In this reality
It applies in example, by adjusting the size of the first current source I20 and the first charging capacitor C20, so that in the first predetermined time T, first
Charging capacitor C20 can be charged to the second reference voltage V justref2.When the Continuity signal of first switch tube M00 is too long, first
The time of charge switch pipe K20 shutdown is longer, and until same the second power tube of period terminates to be connected, the first charging is electric at this time
Hold the overlong time of C20 charging, the voltage output end of the first charging capacitor C20 is exported timing by voltage comparator circuit U03 at this time
Voltage (i.e. the crest voltage of the first charging capacitor C20) and the first reference voltage Vref1It is compared, when timing voltage is greater than the
One reference voltage Vref1, then show, more than the first predetermined time T, to show when same the second power tube of period terminates conducting
The period 1 of switching circuit has been more than the first predetermined time T, needs to reduce the period 1, exports judging result；It opens when first
The Continuity signal for closing pipe M00 is too short, and the time of the first charge switch pipe K20 shutdown is too short, until same the second power of period
Pipe terminates to be connected, and the time of the first charging capacitor C20 charging at this time is too short, and voltage comparator circuit U03 is electric by the first charging at this time
Hold the timing voltage (i.e. the crest voltage of the first charging capacitor C20) and the first reference voltage V of the voltage output end of C20ref1Into
Row compares, when timing voltage is greater than the first reference voltage Vref1, then show when same the second power tube of period terminates conducting,
Not up to the first predetermined time T shows that the period 1 of switching circuit has been not up to the first predetermined time T, needs to improve first
Period exports judging result.
The switch tube driving circuit 30 is adjusted according to the instruction inductive current that instruction inductive current adjustment circuit 20 exports
The turn-on time of the first switch tube of switching circuit, when the bound difference of instruction inductive current reduces, according to instruction inductance electricity
Upper limit value, lower limit value and the sampling inductive current of stream, then the turn-on time of first switch tube reduces, so that switching frequency is got higher；
When the bound difference raising of instruction inductive current, according to the upper limit value of instruction inductive current, lower limit value and inductive current is sampled,
Then the turn-on time of first switch tube increases, so that switching frequency is lower.
In the present embodiment, Fig. 4 or Fig. 5 is please referred to, the switch tube driving circuit 30 includes inductive current control circuit
U06 and driving circuit U07, the inductive current control circuit U06 and the first output end of instruction inductive current adjustment circuit, the
Two output ends be connected, the upper limit value and lower limit value of acquisition instruction inductive current, the inductive current control circuit U06 also with switch
Circuit is connected, and obtains the corresponding sampling inductive current of inductive current of switching circuit, the sampling inductive current both can be split
The inductive current on powered-down road directly samples acquisition, can also be indirect to the electric current by sampling first switch tube and the second power tube
It obtains, according to the upper limit value of instruction inductive current, lower limit value and sampling inductive current, generates driving control signal, the driving
It controls signal and driving capability is reinforced to drive first switch tube by driving circuit U07.
In other embodiments, the inductive current control circuit is connected with switching circuit, obtains the inductance of switching circuit
The corresponding voltage of the corresponding sampling inductive current of electric current, when the bound difference of instruction inductive current reduces, according to instruction inductance
The upper limit value of electric current, lower limit value voltage corresponding with sampling inductive current, then the turn-on time of first switch tube reduces, so that opening
Frequency is closed to get higher；When the bound difference raising of instruction inductive current, according to the upper limit value of instruction inductive current, lower limit value and adopt
The corresponding voltage of sample inductive current, then the turn-on time of first switch tube increases, so that switching frequency is lower.
Wherein, according to the upper limit value of instruction inductive current, lower limit value and sampling inductive current opening come regulating switch circuit
The concrete mode for closing frequency includes: that will sample inductive current to be compared with the instruction upper limit value of inductive current, lower limit value, when adopting
Sample inductive current reaches the upper limit value of instruction inductive current, and the switching signal of first switch tube jumps, so that inductive current
It reduces, when sampling inductive current reaches the lower limit value of instruction inductive current, the switching signal of first switch tube is jumped, so that
Inductive current increases again, by adjusting the switching signal of first switch tube come the switching frequency of regulating switch circuit.It is corresponding
, the bound difference of inductive current is bigger, and the corresponding turn-on time of first switch tube or turn-off time are also longer, switching circuit
Switching frequency it is smaller；The bound difference of inductive current is smaller, the corresponding turn-on time of first switch tube or turn-off time
Smaller, the switching frequency of switching circuit is bigger.
In other embodiments, when the second power tube of switching circuit is devices, the switching tube driving is electric
Road is connected with the first output end of instruction inductive current adjustment circuit, second output terminal, the upper limit value of acquisition instruction inductive current
And lower limit value, the switch tube driving circuit are also connected with switching circuit, obtain the corresponding sampling of inductive current of switching circuit
Inductive current, according to the upper limit value of instruction inductive current, the first switch of lower limit value and sampling inductive current adjustment switching circuit
Pipe and devices switching signal, by the turn-on and turn-off time of first switch tube as far as possible with the first preset time
Unanimously.
Wherein, according to the upper limit value of instruction inductive current, lower limit value and sampling inductive current opening come regulating switch circuit
The concrete mode for closing frequency includes: that will sample inductive current to be compared with the instruction upper limit value of inductive current, lower limit value, when adopting
Sample inductive current reaches the upper limit value of instruction inductive current, and the switching signal of first switch tube and devices is jumped
Become so that inductive current reduce, when sampling inductive current reach instruction inductive current lower limit value, first switch tube with it is synchronous whole
The switching signal of stream metal-oxide-semiconductor jumps, so that inductive current increases again, by adjusting first switch tube and synchronous rectification
The switching signal of metal-oxide-semiconductor carrys out the switching frequency of regulating switch circuit.
Embodiment two
The embodiment of the invention also provides a kind of control method of switching circuit, the switching circuit includes first switch
Pipe, switching circuit by the conducting of the first switch tube and shutdown convert input voltage into output voltage to drive and load,
Referring to FIG. 9, the control method includes:
Step S101, the timing since being begun to turn on first switch tube terminate to be connected to same the second power tube of period
As the period 1, judge whether the period 1 reached for the first predetermined time；
Step S102 was more than the first predetermined time when the period 1, then reduced the bound difference of instruction inductive current, and
According to the upper limit value of instruction inductive current, the switching frequency of lower limit value and sampling inductive current adjustment switching circuit；
Step S103, when the period 1 being not up to for the first predetermined time, then the bound for improving instruction inductive current is poor
Value, and according to the upper limit value of instruction inductive current, the switching frequency of lower limit value and sampling inductive current adjustment switching circuit.
Specifically, in the present embodiment, please refer to by being described to the control method by taking the circuit of Fig. 4 as an example,
But the control method of switching circuit of the invention is not limited to specific control circuit.
Step S101 is executed, the timing since being begun to turn on first switch tube terminates to same the second power tube of period
Conducting is used as the period 1, judges whether the period 1 reached for the first predetermined time.
In the present embodiment, beginning timing is begun to turn in first switch tube using timing circuit U04, judges the same week
The time that the second power tube of phase terminates conducting is the period 1, judges whether the period 1 reaches the first predetermined time T.
Fig. 6 and Fig. 7 are please referred to, when the Continuity signal of first switch tube occurs, the first charge switch pipe K20 is first connected one
It fixes time, which is considerably shorter than first switch tube turn-on time, such as 30ns, in order to answer the upper voltage of the first charging capacitor C20
Position is to 0.Then the first charge switch pipe is disconnected, is charged using the first current source I20 to the first charging capacitor C20.Described
One current source I20 can be fixed current source, or on-fixed current source.In the present embodiment, by adjusting the first electricity
The size of stream source I20 and the first charging capacitor C20, so that the first charging capacitor C20 can be filled just in the first predetermined time T
Electricity is to the first reference voltage Vref1.When the Continuity signal of first switch tube M00 is too long, the first charge switch pipe K20 shutdown when
Between it is longer, until same the second power tube of period terminates to be connected, the overlong time of the first charging capacitor C20 charging, at this time
Voltage comparator circuit U03 by the voltage output end of the first charging capacitor C20 output timing voltage (i.e. the first charging capacitor C20's
Crest voltage) and the first reference voltage Vref1It is compared, when timing voltage is greater than the first reference voltage Vref1, then show first
Period is more than the first predetermined time T；When the Continuity signal of first switch tube M00 is too short, the first charge switch pipe K20 shutdown when
Between it is too short, until same the second power tube of period terminates to be connected, the time of the first charging capacitor C20 charging is too short, electric at this time
Pressure ratio is compared with circuit U 03 by timing voltage (the i.e. peak value of the first charging capacitor C20 of the voltage output end of the first charging capacitor C20
Voltage) and the first reference voltage Vref1It is compared, when timing voltage is less than the first reference voltage Vref1, then show the period 1
Not up to the first predetermined time T.
Step S102 is executed, was more than the first predetermined time when the period 1, then the bound for reducing instruction inductive current is poor
Value, and according to the upper limit value of instruction inductive current, the switching frequency of lower limit value and sampling inductive current adjustment switching circuit.
In the present embodiment, when the period 1 being more than the first predetermined time, judging result, electric current bound difference are issued
It adjusts circuit and electric current bound difference is adjusted according to judging result, and utilize adder or subtracter acquisition instruction inductive current
Upper limit value and lower limit value, switch tube driving circuit 30 utilize the upper limit value of instruction inductive current, lower limit value and sampling inductive current
The switching signal of regulating switch pipe reduces the turn-on time of first switch tube Continuity signal, so that the switch of first switch tube is believed
Number period shorten, switching frequency is got higher, the period 1 so as to control switch circuit it is equal with the first preset time or
Its difference controls in a certain range.
It is compared specifically, inductive current will be sampled with the upper limit value of inductive current, lower limit value is instructed, when sampling inductance
Electric current reaches the upper limit value of instruction inductive current, and the switching signal of first switch tube jumps, so that inductive current reduces, when
Sampling inductive current reaches the lower limit value of instruction inductive current, and the switching signal of first switch tube jumps, so that inductance is electric
Stream increases again, by adjusting the switching signal of first switch tube come the switching frequency of regulating switch circuit.
When the switching circuit includes first switch tube and devices, according to the upper limit value of instruction inductive current,
The method of the switching frequency of lower limit value and sampling inductive current adjustment switching circuit includes: by sampling inductive current and instruction inductance
The upper limit value of electric current, lower limit value are compared, when sampling inductive current reaches the upper limit value of instruction inductive current, first switch tube
It is jumped with the switching signal of devices, so that inductive current reduces, when sampling inductive current reaches instruction inductance
The switching signal of the lower limit value of electric current, first switch tube and devices jumps, so that inductive current rises again
Height, by adjusting the switching signal of first switch tube and devices come the switching frequency of regulating switch circuit.
Step S103 is executed, when the period 1 being not up to for the first predetermined time, then improves the upper and lower of instruction inductive current
Difference is limited, and according to the upper limit value of instruction inductive current, the switching frequency of lower limit value and sampling inductive current adjustment switching circuit.
In the present embodiment, when the period 1 being not up to for the first predetermined time, judging result is issued, electric current bound is poor
Value adjusts circuit and adjusts electric current bound difference according to judging result, and utilizes adder or subtracter acquisition instruction inductive current
Upper limit value and lower limit value, switch tube driving circuit 30 using instruction inductive current upper limit value, lower limit value and switching circuit obtain
The switching signal of the sampling inductive current regulating switch pipe taken, improves the turn-on time of first switch tube Continuity signal, so that the
The period of the switching signal of one switching tube is elongated, and switching frequency is lower, so as to the period 1 and the of control switch circuit
One preset time is equal or its difference controls in a certain range.
It is compared specifically, inductive current will be sampled with the upper limit value of inductive current, lower limit value is instructed, when sampling inductance
Electric current reaches the upper limit value of instruction inductive current, and the switching signal of first switch tube jumps, so that inductive current reduces, when
Sampling inductive current reaches the lower limit value of instruction inductive current, and the switching signal of first switch tube jumps, so that inductance is electric
Stream increases again, by adjusting the switching signal of first switch tube come the switching frequency of regulating switch circuit.
When the switching circuit includes first switch tube and devices, according to the upper limit value of instruction inductive current,
The method of the switching frequency of lower limit value and sampling inductive current adjustment switching circuit includes: by sampling inductive current and instruction inductance
The upper limit value of electric current, lower limit value are compared, when sampling inductive current reaches the upper limit value of instruction inductive current, first switch tube
It is jumped with the switching signal of devices, so that inductive current reduces, when sampling inductive current reaches instruction inductance
The switching signal of the lower limit value of electric current, first switch tube and devices jumps, so that inductive current rises again
Height, by adjusting the switching signal of first switch tube and devices come the switching frequency of regulating switch circuit.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of control method of switching circuit, the switching circuit includes first switch tube and the second power tube, switching circuit
Output voltage is converted input voltage by the conducting and shutdown of the first switch tube to drive load, which is characterized in that
The control method includes:
The timing since being begun to turn on first switch tube terminates conducting to same the second power tube of period and is used as the period 1,
Judge whether the period 1 reached for the first predetermined time；
Instruction inductive current upper limit value or lower limit value are obtained according to output voltage and reference voltage difference, according to instruction inductance electricity
Stream upper limit value and instruction inductive current bound difference obtain instruction inductive current lower limit value, alternatively, according to instruction inductive current
Lower limit value and instruction inductive current bound difference obtain instruction inductive current upper limit value；
It was more than the first predetermined time when the period 1, then reduces the bound difference of instruction inductive current, and according to adjusted
Instruct the upper limit value of inductive current, the switching frequency of lower limit value and sampling inductive current adjustment switching circuit；
When the period 1 being not up to for the first predetermined time, then the bound difference of instruction inductive current is improved, and according to adjustment
Upper limit value, lower limit value and the sampling inductive current of instruction inductive current afterwards adjust the switching frequency of switching circuit.
2. the control method of switching circuit as described in claim 1, which is characterized in that the period 1 is more than first predetermined
The judgment step of time specifically includes: timing is carried out using timing circuit, when same the second power tube of period terminates conducting,
The timing voltage of timing circuit is greater than the first predeterminated voltage, then shows that the period 1 alreadyd exceed for the first predetermined time；Described
The judgment step that one period was not up to for the first predetermined time specifically includes: timing is carried out using timing circuit, when the same period
When second power tube terminates conducting, the timing voltage of timing circuit then shows that the period 1 is not up to less than the first predeterminated voltage
First predetermined time.
3. the control method of switching circuit as described in claim 1, which is characterized in that according to instruction inductive current adjusted
Upper limit value, the method for switching frequency of lower limit value and sampling inductive current adjustment switching circuit include: that will sample inductive current
It is compared with the instruction upper limit value of inductive current, lower limit value, when sampling inductive current reaches the upper limit value of instruction inductive current,
The switching signal of first switch tube jumps, so that inductive current reduces, when sampling inductive current reaches instruction inductive current
Lower limit value, the switching signal of first switch tube jumps, so that inductive current increases again.
4. a kind of control circuit of switching circuit, the switching circuit includes first switch tube, and switching circuit passes through described first
The conducting and shutdown of switching tube convert input voltage into output voltage to drive load, which is characterized in that the control circuit
Include:
Continuity signal timing circuit obtains the switching signal of first switch tube, and the timing since being begun to turn on first switch tube is arrived
Same the second power tube of period terminates conducting as the period 1, judges whether the period 1 reached for the first predetermined time, defeated
Judging result out；
Instruct inductive current adjustment circuit, according to output voltage and reference voltage difference obtain instruction inductive current upper limit value or
Lower limit value obtains instruction inductive current lower limit value according to instruction inductive current upper limit value and instruction inductive current bound difference,
Alternatively, obtaining instruction inductive current upper limit value according to instruction inductive current lower limit value and instruction inductive current bound difference；From
Switching circuit acquisition instruction inductive current, according to the judging result adjustment instruction inductive current of Continuity signal timing circuit, when
When one period was more than the first predetermined time, then the bound difference of instruction inductive current is reduced；First is not up to when the period 1
When the predetermined time, then the bound difference of instruction inductive current is improved；
Switch tube driving circuit obtains sampling inductive current from switching circuit, according to the upper limit of instruction inductive current adjusted
The switching frequency of value, lower limit value and sampling inductive current adjustment switching circuit.
5. the control circuit of switching circuit according to claim 4, which is characterized in that the Continuity signal timing circuit packet
Include timing circuit and voltage comparator circuit；
Wherein, same the second power tube of period is arrived in timing circuit timing since being begun to turn on the first switch tube
When terminating conducting, timing voltage is exported；
The voltage comparator circuit compares the timing voltage with the second reference voltage, when timing voltage is greater than the second reference
Voltage then shows that when the period 1 be more than the first predetermined time；When timing voltage is less than the second reference voltage, then show when first
Period was not up to for the first predetermined time, exported judging result.
6. the control circuit of switching circuit according to claim 4, which is characterized in that described instruction inductive current adjustment electricity
Road includes: that electric current bound difference adjusts circuit, current regulator, output voltage feed circuit；
The feedback input end of the output voltage feed circuit is connected with the load outputs of switching circuit, acquisition and switching circuit
The corresponding instruction inductive current of inductive current upper limit or lower limit, and the as instruction inductive current adjustment circuit
One output end；
The input terminal that the electric current bound difference adjusts circuit is connected with the output end of Continuity signal timing circuit, passes through acquisition
The bound difference of the judging result regulating command inductive current of Continuity signal timing circuit；
Two input terminals of the current regulator respectively with the output end of output voltage feed circuit, electric current bound difference tune
The output end on economize on electricity road is connected, second output of the output end of the current regulator as instruction inductive current adjustment circuit
End, utilizes the corresponding lower limit value of the current regulator regulating command inductive current or upper limit value.
7. the control circuit of switching circuit according to claim 6, which is characterized in that the current regulator is adder
Or subtracter, when the current regulator is adder, the output voltage feed circuit obtains the inductance with switching circuit
The lower limit value of the corresponding instruction inductive current of electric current is adjusted instruction inductive current using adder, acquisition instruction electricity
The upper limit value of inducing current；When the current regulator is subtracter, the output voltage feed circuit obtains and switching circuit
Inductive current it is corresponding instruction inductive current upper limit value, using subtracter to instruction inductive current be adjusted, obtain
Instruct the lower limit value of inductive current.
8. the control circuit of switching circuit according to claim 6 or 7, which is characterized in that the switch tube driving circuit
Be connected with instruction the first output end of inductive current adjustment circuit, second output terminal, the upper limit value of acquisition instruction inductive current with
Lower limit value, the switch tube driving circuit are also connected with switching circuit, obtain the corresponding sampling electricity of inductive current of switching circuit
Inducing current, according to the upper limit value of instruction inductive current, the first switch tube of lower limit value and sampling inductive current adjustment switching circuit
Switching signal.
9. the control circuit of switching circuit according to claim 8, which is characterized in that by sampling inductive current and instruction electricity
The upper limit value of inducing current, lower limit value are compared, when sampling inductive current reaches the upper limit value of instruction inductive current, first switch
The switching signal of pipe jumps so that inductive current reduce, when sampling inductive current reach instruction inductive current lower limit value,
The switching signal of first switch tube jumps, so that inductive current increases again, the switch by adjusting first switch tube is believed
Number carry out the switching frequency of regulating switch circuit.
10. a kind of switch circuit devices with the 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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| 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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| CN109217661B (en) * | 2017-06-29 | 2020-10-16 | 中车株洲电力机车研究所有限公司 | Method and apparatus for controlling switching frequency of chopper circuit |
| CN107276412B (en) * | 2017-07-14 | 2023-10-27 | 杰华特微电子股份有限公司 | Control method and control circuit of switching circuit and switching circuit |
| CN108539966A (en) * | 2017-12-27 | 2018-09-14 | 杰华特微电子（杭州）有限公司 | A kind of control method for frequency, control circuit and switching circuit |
| CN114189131A (en) * | 2021-08-13 | 2022-03-15 | 杰华特微电子股份有限公司 | Control method and control circuit of switching power supply and switching power supply |
| US11742750B2 (en) | 2021-10-11 | 2023-08-29 | Halo Microelectronics International | Boost converter apparatus and control method |
| CN113972839B (en) * | 2021-12-27 | 2022-03-11 | 广东希荻微电子股份有限公司 | Control method and controller of boost converter and power conversion device |
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| JP2004152627A (en) * | 2002-10-30 | 2004-05-27 | Nippon Dainatekku Kk | Current control method and current control device to implement above |
| JP5133846B2 (en) * | 2008-10-29 | 2013-01-30 | 株式会社東海理化電機製作所 | Load drive device |
| CN102412712A (en) * | 2011-11-29 | 2012-04-11 | 杭州矽力杰半导体技术有限公司 | Compensation control circuit and method for direct current converter |
| CN102946129B (en) * | 2012-11-30 | 2015-02-04 | 成都芯源系统有限公司 | Battery charging circuit and control circuit and control method thereof |
| CN103326546B (en) * | 2013-06-14 | 2015-10-14 | 西南交通大学 | Fixing turn-off time peak current mode pulse sequence control method and device thereof |
| CN103595228A (en) * | 2013-11-20 | 2014-02-19 | 西安永电电气有限责任公司 | Digital control method and system for IGBT |
| CN206041804U (en) * | 2016-08-31 | 2017-03-22 | 杰华特微电子（张家港）有限公司 | Switch circuit's control circuit and switch circuit device |
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