CN206099768U - Switch circuit's control circuit and switch circuit device - Google Patents
Switch circuit's control circuit and switch circuit device Download PDFInfo
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- CN206099768U CN206099768U CN201621010017.6U CN201621010017U CN206099768U CN 206099768 U CN206099768 U CN 206099768U CN 201621010017 U CN201621010017 U CN 201621010017U CN 206099768 U CN206099768 U CN 206099768U
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Abstract
The utility model discloses a switch circuit's control circuit and the switch circuit device that corresponds relate to circuit technical field for ensure switch circuit work at DCM, and DCM get into have certain degree of depth after, just begin the exhibition frequently, avoid switch circuit work just beginning exhibition frequently when CCM. This control circuit includes: acquire the module for acquire the very first time, with acquire the comparison module that the module is connected for the size of the more first set time and the very first time, the adjustment module of being connected with module relatively when the very first time is less than the first set time, is adjusted the module and is adjusted into the second set time with cycle that switches on the signal of first switch tube, when the very first time was greater than the first set time, the adjustment module was adjusted into the second set time with second time and first set time sum, in order to realize that the exhibition frequently. The utility model provides a switch circuit's control circuit is used for controlling switch circuit and opens up frequently.
Description
Technical field
The utility model is related to field of circuit technology, and the control circuit of more particularly to a kind of on-off circuit and on-off circuit are filled
Put.
Background technology
At present, on-off circuit (for example, BUCK circuits) is a kind of circuit commonly used in circuit design, as shown in figure 1,
BUCK circuits generally include first switch pipe 1 ', second switch pipe 2 ' and inductance 3 ', wherein, first switch pipe 1 ' can be MOS
Pipe (Metal Oxide Semiconductor Field Effect Transistor, Metal-oxide-semicondutor type field effect
Should manage), second switch pipe 2 ' can be fly-wheel diode, or synchronous rectifier, Vin ' believes for the input of BUCK circuits
Number, Vout ' is the output signal of BUCK circuits, and TON ' is the Continuity signal of first switch pipe 1 '.
Specifically, when the load of on-off circuit is larger, on-off circuit is in CCM (Continuous Conduction
Mode, continuous conduction mode), now can be by way of setting timing circuit, the switch periods for making first switch pipe 1 ' are
Set time T ', so as to realize on-off circuit frequency is determined.In this case, the ripple of the Continuity signal TON ' of first switch pipe 1 '
The waveform of shape, the waveform of the Continuity signal BON ' of second switch pipe 2 ' and inductive current I ' as shown in Fig. 2 wherein, first switch
The cycle of the Continuity signal TON ' of pipe 1 ' is above-mentioned set time T '.When on-off circuit load from large to small when, on-off circuit
DCM (Discontinuous Conduction Mode, discontinuous conduction mode) is gradually switched to from CCM, now first switch pipe
The waveform of the waveform of 1 ' Continuity signal TON ', the waveform of the Continuity signal BON ' of second switch pipe 2 ' and inductive current I ' is as schemed
Shown in 3, wherein, the cycle of the Continuity signal TON ' of first switch pipe 1 ' keeps constant, remains as set time T ', first switch
The ON time of pipe 1 ' shortens.Specifically, when on-off circuit is operated in DCM, within a work period, inductive current I ' exists
Inductive current peak is risen in the ON time (i.e. when TON ' is in high level in Fig. 3) of first switch pipe 1 ', second
0A is dropped in the ON time (when BON ' is in high level in Fig. 3) of switching tube 2 ', and is always maintained at 0A to next work
Before cycle first switch pipe 1 ' is turned on, then repeated the waveform of a upper work period.
However, the utility model people of the application has found, and after on-off circuit enters DCM from CCM, with the reduction of load,
Load current can and then reduce, and the ON time of first switch pipe 1 ' can shorten, and can by the course of work of said switching circuit
Know, the cycle of Continuity signal TON ' of the first switch pipe 1 ' when on-off circuit is in DCM is electric in switch with first switch pipe 1 '
The cycle phase of the Continuity signal signal TON ' when road is in CCM is same, i.e., under the above two mode of operation of on-off circuit, first
The switch periods of switching tube 1 ' keep constant, therefore, by arranging timing circuit to realize when determining frequency of on-off circuit, when the
The ON time of one switching tube 1 ' is foreshortened to after the minimum ON time that first switch pipe 1 ' is allowed, due to first switch pipe 1 '
Continuity signal TON ' dutycycle for first switch pipe 1 ' ON time divided by first switch pipe 1 ' switch periods, so as to
So that the dutycycle of the Continuity signal TON ' of first switch pipe 1 ' can not continue to reduce, cause the load current of on-off circuit without
Method continues to reduce with the reduction of load.
Utility model content
The purpose of this utility model is the control circuit and switch circuit devices for providing a kind of on-off circuit, for guaranteeing
On-off circuit is operated in DCM, and DCM is entered and had after certain depth, just starts spread spectrum, it is to avoid when on-off circuit is operated in CCM just
Start spread spectrum.
To reach above-mentioned purpose, the control circuit of the on-off circuit that the utility model is provided adopts following scheme：
A kind of control circuit of on-off circuit, the on-off circuit for being applied to be in during discontinuous conduction mode is described to open
Powered-down road includes first switch pipe and second switch pipe, and the control circuit includes：Acquisition module, for obtaining the very first time,
The very first time is the trailing edge and adjacent subsequent work of the Continuity signal of the second switch pipe of current operating cycle
Time between the rising edge of the Continuity signal of the first switch pipe in cycle；The comparison mould being connected with the acquisition module
Block, for comparing the size of the first set time and the very first time；The adjusting module being connected with the comparison module, works as institute
When stating the very first time less than first set time, the adjusting module is by the cycle of the Continuity signal of the first switch pipe
It was adjusted to for the second set time；When the very first time first set time is more than, the adjusting module is by described the
Two times were adjusted to second set time with the first set time sum, to realize spread spectrum, wherein, when described second
Between be the same work period the first switch pipe Continuity signal rising edge and the second switch pipe Continuity signal
Trailing edge between time.
Alternatively, the acquisition module includes OR gate, transistor, the first electric capacity and the first current source；Wherein, the OR gate
First input end be connected with the Continuity signal of the first switch pipe, the second input and the second switch of the OR gate
The Continuity signal connection of pipe, the output end of the OR gate is connected with the control end of the transistor；The first end of the transistor
Ground connection, the node being connected with the second end of the transistor is first node；The first node is also electric with described first respectively
The first pole plate connection of stream source and first electric capacity, the second pole plate ground connection of first electric capacity.
Alternatively, the comparison module includes the first potential comparator, the first input end of first potential comparator
It is connected with the first node, the current potential of the second input of first potential comparator is the first reference potential, described the
The output end of one potential comparator is connected with the adjusting module, wherein, first reference potential is described very first time etc.
When first set time, current potential of the first node at the end of the very first time.
Alternatively, the adjusting module includes edge comparator, the first meter of timing is carried out to second set time
The ON time adjustment unit that Shi Danyuan and the cycle to the Continuity signal of the first switch pipe are adjusted；Wherein, it is described
The first input end of edge comparator is connected with the output end of first potential comparator, and the second of the edge comparator is defeated
Enter end to be connected with the output end of first timing unit, the 3rd input and the first switch pipe of the edge comparator
Continuity signal connection, first output end and the second output end of the edge comparator with the ON time adjustment unit
Connection.
Alternatively, first timing unit compares including first switch, the second electric capacity, the second current source and the second current potential
Device；Wherein, the control end of the first switch is connected with the Continuity signal of the first switch pipe, and the first of the first switch
End ground connection, the node being connected with the second end of the first switch is Section Point；The Section Point is also respectively at described
The first input end connection of the first pole plate of two electric capacity, second current source and second potential comparator, described second
The second pole plate ground connection of electric capacity；The current potential of the second input of second potential comparator is the second reference potential, described the
The output end of two potential comparators is connected with the first input end of the edge comparator；Wherein, second reference potential is
The switch periods of the first switch pipe be equal to second set time when, the Section Point in the on-off circuit one
Current potential at the end of the individual work period.
Alternatively, the ON time adjustment unit includes second switch, the 3rd current source, the 3rd switch, the 4th electric current
Source, the 3rd electric capacity and voltage turn electric current device；Wherein, the control end of the second switch is exported with the first of the edge comparator
End connection, the first end of the second switch is connected with the 3rd current source, is connected with the second end of the second switch
Node is the 3rd node；3rd node first end, the first pole of the 3rd electric capacity also respectively with the described 3rd switch
Plate and the voltage turn the input connection of electric current device；The control end of the 3rd switch is defeated with the second of the edge comparator
Go out end connection, the second end of the 3rd switch is connected with the first end of the 4th current source, the of the 4th current source
Two ends are connected with the second pole plate of the 3rd electric capacity；The voltage turns the output end of electric current device and leading for the first switch pipe
The control signal connection of messenger.
Alternatively, second set time is the first switch pipe when on-off circuit is in continuous conduction mode
Switch periods.
The utility model additionally provides a kind of switch circuit devices with the control circuit.
The utility model is compared to the beneficial effect of prior art：
Because the control circuit of on-off circuit provided by the utility model has with upper module, so as to pass through first
Acquisition module obtains the very first time, then the first set time is compared with the size of the very first time by comparison module,
By the period modulation of the Continuity signal of first switch pipe it is the by adjusting module when the very first time being less than for the first set time
Two set times, when the very first time being more than for the first set time, by adjusting module by the second time and the first set time
Sum was adjusted to for the second set time, to realize spread spectrum.Therefore, control circuit provided by the utility model can be by arranging
Rational first set time and the second set time, so that on-off circuit is during spread spectrum, when accurately determining second
Between numerical value, i.e., can accurately determine the rising edge and second switch of the Continuity signal of the first switch pipe of same work period
Time between the trailing edge of the Continuity signal of pipe, so that it is guaranteed that on-off circuit is operated in DCM, and DCM is entered and is had certain depth
Afterwards, spread spectrum is just started, it is to avoid on-off circuit begins to spread spectrum when being operated in CCM.
Description of the drawings
Fig. 1 is the circuit diagram of BUCK circuits of the prior art；
Fig. 2 is working timing figure when on-off circuit of the prior art is operated in CCM；
Fig. 3 is working timing figure when on-off circuit of the prior art is operated in DCM；
Fig. 4 is the inductive current oscillogram before and after the on-off circuit spread spectrum in the utility model embodiment；
Fig. 5 is the module diagram of the control circuit of the on-off circuit in the utility model embodiment；
Fig. 6 is the circuit diagram of the control circuit of the on-off circuit in the utility model embodiment；
Fig. 7 is the working timing figure one of the control circuit of the on-off circuit in the utility model embodiment；
Fig. 8 is the working timing figure two of the control circuit of the on-off circuit in the utility model embodiment；
Fig. 9 is the working timing figure three of the control circuit of the on-off circuit in the utility model embodiment；
Figure 10 is the working timing figure three of the control circuit of the on-off circuit in the utility model embodiment；
Figure 11 is the flow chart of the control method of the on-off circuit in the utility model embodiment.
Description of reference numerals：
1- acquisition modules；2- comparison modules；3- adjusting modules；
31- edges comparator；The timing units of 32- first；33- ON time adjustment units；
331- voltages turn electric current device.
Specific embodiment
Below in conjunction with accompanying drawing, and technical characteristic and advantage of other above-mentioned to the utility model are carried out clearly and completely
Description, it is clear that described embodiment is only section Example of the present utility model, rather than whole embodiments.
Embodiment one
Technical problem in solve background technology, the utility model embodiment is led there is provided a kind of to first switch pipe
The method that messenger carries out spread spectrum, i.e., by way of the cycle of the Continuity signal of proper extension first switch pipe, to reduce
The dutycycle of the Continuity signal of one switching tube, so that the load current of on-off circuit can continue with the reduction of load
Reduce.
Specifically, as shown in figure 4, when inductive current ripple is Δ i, to the Continuity signal of first switch pipe spread spectrum is carried out
The waveform of front inductive current I is B, and the cycle of the Continuity signal of first switch pipe is T；The Continuity signal of first switch pipe is entered
The waveform of the inductive current I after row spread spectrum is C, and the time that the cycle of the Continuity signal of first switch pipe is extended is D.Need
Bright, inductive current ripple Δ i is in a work period of on-off circuit, inductive current peak is minimum with inductive current
The difference of value.
However, the utility model people of the application has found, the above-mentioned Continuity signal to first switch pipe carries out the technology of spread spectrum
Scheme is after inductive current ripple is less than a particular value, just to start spread spectrum, therefore, (for example, the inductance under the conditions of different application
Difference, or input voltage difference, or output voltage difference), if according to above-mentioned technical proposal, may be such that switch electricity
Road begins to spread spectrum in CCM, causes the operating efficiency of on-off circuit relatively low.
To solve the above problems, the utility model embodiment further provides a kind of switch circuit devices, the switch
Circuit arrangement includes on-off circuit and control circuit, and the control circuit is applied to control to be in switch electricity during discontinuous conduction mode
Road, on-off circuit includes first switch pipe and second switch pipe, as shown in figure 5, the control circuit includes：Acquisition module 1, is used for
The very first time is obtained, the very first time is next with adjacent for the trailing edge of the Continuity signal of the second switch pipe of current operating cycle
Time between the rising edge of the Continuity signal of the first switch pipe of work period；The comparison module 2 being connected with acquisition module 1,
For comparing the size of the first set time and the very first time；The adjusting module 3 being connected with comparison module 2 is little when the very first time
When the first set time, the period modulation of the Continuity signal of first switch pipe was the second set time by adjusting module 3；When
When one time was more than for the first set time, the second time and the first set time sum are adjusted to the second fixation by adjusting module 3
Time, to realize spread spectrum, wherein, the second time was the rising edge of the Continuity signal of the first switch pipe of same work period and
Time between the trailing edge of the Continuity signal of two switching tubes.
Preferably, the second set time was the switch periods of first switch pipe when on-off circuit is in continuous conduction mode,
So that on-off circuit from continuous conduction mode when discontinuous conduction mode is entered, the switch periods of first switch pipe will not go out
Existing saltus step so that realize on-off circuit from continuous conduction mode switch to discontinuous conduction mode when seamless connection.
The control circuit of the on-off circuit provided due to the utility model embodiment is had with upper module, so as to first can
Enough the very first time is obtained by acquisition module 1, then entered with the size of the very first time by 2 pairs of the first set times of comparison module
Row compares, when the very first time being less than for the first set time, by adjusting module 3 by the cycle of the Continuity signal of first switch pipe
It was adjusted to for the second set time, when the very first time being more than for the first set time, by adjusting module 3 by the second time and first
Set time sum was adjusted to for the second set time, to realize spread spectrum.Therefore, the control electricity that the utility model embodiment is provided
Road can pass through to arrange rational first set time and the second set time, so that on-off circuit is during spread spectrum, it is accurate
Really determine the numerical value of the second time, i.e., can accurately determine the first switch pipe of same work period Continuity signal it is upper
Time between the trailing edge of the Continuity signal for rising edge and second switch pipe such that it is able to guarantee that on-off circuit is operated in DCM, and
DCM is entered to be had after certain depth, just starts spread spectrum, so as to avoid on-off circuit from beginning to spread spectrum when being operated in CCM.
The particular circuit configurations of above-mentioned acquisition module 1, comparison module 2 and adjusting module 3 are described below.
Specifically, as shown in fig. 6, acquisition module 1 includes OR gate U10, transistor M10, the first electric capacity C10 and the first electric current
Source I10.Wherein, the first input end of OR gate U10 is connected with the Continuity signal TON of first switch pipe, second input of OR gate U10
End is connected with the Continuity signal BON of second switch pipe, and the output end of OR gate U10 is connected with the control end of transistor M10；Transistor
The first end ground connection of M10, the node being connected with second end of transistor M10 is first node CAP1；First node CAP1 also divides
It is not connected with first pole plate of the first current source I10 and the first electric capacity C10, the second pole plate ground connection of the first electric capacity C10.
When the Continuity signal TON of first switch pipe is high level for the Continuity signal BON of high level or second switch pipe
When, i.e., when the conducting of first switch pipe or second switch pipe are turned on, OR gate U10 output high level, now transistor M10 conductings, the
First pole plate of one electric capacity C10 is grounded by transistor M10.When the Continuity signal BON of second switch pipe is reduced to from high level
During low level, i.e., when second switch pipe is turned off, OR gate U10 output low levels, now transistor M10 shut-offs, the first pole of electric capacity
Plate disconnects with ground, and the first current source I10 charges to electric capacity so that the current potential of the first pole plate of electric capacity is raised.Work as next cycle
The rising edge of Continuity signal TON of first switch pipe when occurring again, i.e., when first switch pipe is turned on again, OR gate U10 is defeated
Go out high level, now transistor M10 is turned on again, then repeat the course of work of upper a cycle.In addition, can by foregoing teachings
Know, trailing edge and adjacent subsequent work week of the very first time for the Continuity signal BON of the second switch pipe of current operating cycle
Time between the rising edge of the Continuity signal TON of the first switch pipe of phase, the second time is that the first of same work period opens
Time between the trailing edge of the Continuity signal BON for closing the rising edge and second switch pipe of the Continuity signal TON of pipe, therefore, tool
The course of work for having the acquisition module 1 of foregoing circuit structure can do following summary：Within the second time, the first pole plate one of electric capacity
Directly it is connected to ground；When starting the very first time, the first current source I10 is started to charge up to the first pole plate of electric capacity, in the very first time
At the end of, first pole plate complete charges of the first current source I10 to electric capacity.
Further, as shown in fig. 6, comparison module 2 includes the first potential comparator U11, the first potential comparator U11's
First input end is connected with first node CAP1, and the current potential of second input of the first potential comparator U11 is the first reference electricity
Position Vref1, the output end of the first potential comparator U11 is connected with adjusting module 3, wherein, the first reference potential Vref1 is first
When time is equal to the first set time t1, current potentials of the first node CAP1 at the end of the very first time.Therefore, it is little when the very first time
When the first set time t1, as shown in figure 9, now at the end of the very first time the first pole plate of electric capacity current potential (i.e. first
The current potential of node CAP1) the first reference potential Vref1 is less than, output signal OUT1 of the first potential comparator U11 is constantly in
High level, i.e. output signal OUT1 of the first potential comparator U11 is not in trailing edge；Fix more than first when the very first time
Time t1, as shown in Figure 10, now the current potential of the first pole plate of electric capacity is more than the first reference potential at the end of the very first time
Output signal OUT1 of Vref1, the first potential comparator U11 can be reduced to low level, i.e. the first potential comparator from high level
Output signal OUT1 of U11 occurs trailing edge, wherein, VD is the current potential of the first current source I10.Analyze from more than, energy
It is enough to compare the first set time t1 and first by the way that whether output signal OUT1 of the first potential comparator U11 trailing edge occurs
The size of time.In addition, it is necessary to illustrate, the abscissa of above-mentioned each signal waveform is time t.
Further, as shown in fig. 6, adjusting module 3 includes edge comparator 31, carries out timing to the second set time T
The first timing unit 32 and ON time adjustment unit that cycle of the Continuity signal TON of first switch pipe is adjusted
33.Wherein, the first input end of edge comparator 31 is connected with the output end of the first potential comparator U11, edge comparator 31
The second input be connected with the output end of the first timing unit 32, the 3rd input of edge comparator 31 and first switch pipe
Continuity signal TON connections, first output end UP and the second output end DOWN of edge comparator 31 are adjusted with ON time
Unit 33 connects.
Specifically, as shown in fig. 6, the first timing unit 32 includes first switch K10, the second electric capacity C20, the second current source
I20 and the second potential comparator U20.Wherein, the control end of first switch K10 is connected with the Continuity signal TON of first switch pipe,
The first end ground connection of first switch K10, the node being connected with the second end of first switch K10 is Section Point CAP2；Second section
First pole plates of the point CAP2 also respectively at the second electric capacity C20, the second current source I20 and the second potential comparator U20 it is first defeated
Enter end connection, the second pole plate ground connection of the second electric capacity C20；The current potential of second input of the second potential comparator U20 is second
Reference potential Vref2, the output end of the second potential comparator U20 is connected with the first input end of edge comparator 31；Wherein,
When two reference potential Vref2 are equal to the second set time T for the switch periods of first switch pipe, Section Point CAP2 is in switch electricity
Current potential at the end of one work period on road.
When the rising edge of the Continuity signal TON of first switch pipe occurs, first switch K10 conducting certain hour, this when
Between be considerably shorter than the ON time of first switch pipe, such as 30 nanoseconds, now, first pole plate of the second electric capacity C20 passes through first switch
K10 is connected to ground so as to reset to 0V.Then first switch K10 disconnects, and the first pole plate and the ground of the second electric capacity C20 disconnect, the
Two current source I20 start the first pole plate to the second electric capacity C20 and charge, when the Continuity signal of the first switch pipe of next cycle
When the rising edge of TON occurs, first switch K10 turns on certain hour again, and now the second current source I20 is right in a cycle
The first pole plate complete charge of the second electric capacity C20, then first switch K10 is backed off, and repeats the work of upper a cycle
Process.From the charging process of first pole plate of above-mentioned second electric capacity C20, when the switch periods of first switch pipe are less than second
During set time T, the current potential of first pole plate of the second electric capacity C20 at the end of a cycle charging is less than the second reference potential
Vref2, now the output signal of the second potential comparator U20 be constantly in low level, the i.e. output of the second potential comparator U20
Signal is not in rising edge；When the switch periods of first switch pipe are more than the second set time T, the of the second electric capacity C20
Current potential of one pole plate at the end of a cycle charging is more than the second reference potential Vref2, now the second potential comparator U20
Output signal can rise to high level from low level, i.e. the output signal of the second potential comparator U20 occurs rising edge.
Additionally, as shown in fig. 6, ON time adjustment unit 33 includes that second switch K20, the 3rd current source I30, the 3rd open
Close K30, the 4th current source I40, the 3rd electric capacity C30 and voltage and turn electric current device 331.Wherein, the control end of second switch K20 and side
The first output end UP along comparator 31 connects, and the first end of second switch K20 is connected with the 3rd current source I30, opens with second
The node for closing the second end connection of K20 is the 3rd node CAP3；3rd node CAP3 also respectively with the 3rd switch K30 first
End, first pole plate of the 3rd electric capacity C30 and voltage turn the input connection of electric current device 331；The control end of the 3rd switch K30 and side
The second output end DOWN along comparator 31 connects, and the second end and the first end of the 4th current source I40 of the 3rd switch K30 connect
Connect, second end of the 4th current source I40 is connected with second pole plate of the 3rd electric capacity C30；Voltage turn the output end of electric current device 331 with
The control signal connection of the Continuity signal TON of first switch pipe.
First timing unit 32 starts timing in the rising edge of the Continuity signal TON of first switch pipe, in timing to second
During set time T, the output switching activity of the second potential comparator U20 of the first timing unit 32, if the first potential comparator U11
Trailing edge and the rising edge of the Continuity signal TON of next cycle first switch pipe all do not occur, then edge comparator 31
3rd switch K30 shut-offs, the first output end UP of edge comparator 31 are made second switch K20 conductings one by the second output end DOWN
The section time, then turn off again, so as to increase the electric charge on the 3rd electric capacity C30, improve the 3rd node CAP3 voltages, voltage turns electric current
Device 331 is by a certain percentage converted into the voltage of the 3rd node CAP3 to change output current OUT2 that voltage turns electric current device 331 into, because
This output current OUT2 becomes big, reduces the ON time of first switch pipe, so that the switch periods of first switch pipe reduce,
Switching frequency is uprised；First timing unit 32 when the second set time of timing T is not arrived, under the first potential comparator U11
Drop along or the Continuity signal of first switch pipe of next cycle occur, then the first output end UP of edge comparator 31 is by the
Two switch K20 shut-offs, the second output end DOWN of edge comparator 31 made for the 3rd switch K30 conducting a period of times, then closed again
It is disconnected, so as to the electric charge on the 3rd electric capacity C30 is bled off into a part, the voltage of the 3rd node CAP3 is reduced, voltage turns electric current device 331
The voltage of the 3rd node CAP3 is converted into into by a certain percentage output current OUT2, output current OUT2 reduces, then increase by first
The ON time of switching tube, so that switching frequency step-down.
When the very first time the first set time t1 is less than, if as shown in fig. 7, the switch periods of first switch pipe are more than the
Two set time T, then the first output end UP control second switch K20 conducting a period of times of edge comparator 31, then inciting somebody to action
Second switch K20 is turned off, and the second output end DOWN control the 3rd of edge comparator 31 switchs K30 and is constantly in off state,
In the ON time of second switch K20, the 3rd current source I30 charges to first pole plate of the 3rd electric capacity C30, so that the
The current potential of three node CAP3 is raised, voltage turn electric current device 331 according to rising after the 3rd node CAP3 current potential, according to certain ratio
Example is converted into output current OUT2 that voltage turns electric current device 331, so as to adjust the control letter of the Continuity signal TON of first switch pipe
Number so that the switch periods of first switch pipe shorten, so that the switch periods of first switch pipe and second set time T-phase etc.
Or be close to.If the switch periods of first switch pipe are less than the second set time T, the second output end of edge comparator 31
DOWN controls the 3rd switch K30 conducting a period of times, and then by the 3rd switch K30 shut-offs, the first of edge comparator 31 is defeated
Go out to hold UP control second switch K20 to be constantly in off state, in the ON time of the 3rd switch K30, the 3rd electric capacity C30's
The electric charge of the first pole plate can discharge a part, so that the current potential of the 3rd node CAP3 is reduced, voltage turns electric current device 331
The current potential of the 3rd node CAP3 after according to reduction, is converted into according to a certain percentage output current OUT2 that voltage turns electric current device 331,
So as to adjust the control signal of the Continuity signal TON of first switch pipe so that the switch periods of first switch pipe extend, so that
The switch periods of first switch pipe and the second set time T-phase etc. are close to.
Similarly, when the very first time the first set time t1 is more than, if as shown in figure 8, the second time and the first fixation
Time t1 sum is more than the second set time T, then the current potential for making the 3rd node CAP3 is raised, so that voltage turns electric current device 331
The increase of output current OUT2 so that the second time and the first set time t1 sum and second set time T-phase etc. or
Person is close to.If the second time was less than the second set time T with the first set time t1 sum, the current potential of the 3rd node CAP3 is made
Reduce, so that output current OUT2 that voltage turns electric current device 331 reduces, so that the second time and the first set time t1
Sum and the second set time T-phase etc. are close to.The above-mentioned specific course of work refers to the very first time less than the first fixation
Course of work during time t1, is no longer repeated herein.
Embodiment two
The utility model embodiment provides a kind of control method of on-off circuit, and the control method is applied in interrupted
On-off circuit during conduction mode, on-off circuit includes first switch pipe and second switch pipe, as shown in figure 11, the control method
Including：S1, the acquisition very first time, the very first time is the trailing edge and phase of the Continuity signal of the second switch pipe of current operating cycle
Time between the rising edge of the Continuity signal of the first switch pipe in adjacent subsequent work cycle；S2, compared for the first set time
With the size of the very first time；S3, when the very first time be less than the first set time when, by the cycle of the Continuity signal of first switch pipe
It was adjusted to for the second set time；S4, when the very first time being more than for the first set time, by the second time and the first set time it
Be adjusted to for the second set time, to realize spread spectrum, wherein, the second time was the conducting of the first switch pipe of same work period
Time between the trailing edge of the rising edge of signal and the Continuity signal of second switch pipe.
The control method of the on-off circuit provided due to the utility model embodiment has above step, so as to first can
The very first time is enough obtained, then the first set time was compared with the size of the very first time, when the very first time first is less than
It was the second set time by the period modulation of the Continuity signal of first switch pipe during the set time, when the very first time first is more than
During the set time, the second time and the first set time sum were adjusted to into for the second set time, to realize spread spectrum.Therefore, originally
The control method that utility model embodiment is provided can pass through to arrange rational first set time and the second set time, with
On-off circuit is made during spread spectrum, the numerical value of the second time is accurately determined, i.e., can accurately determine same work week
Time between the trailing edge of the rising edge of the Continuity signal of the first switch pipe of phase and the Continuity signal of second switch pipe, so as to
It is able to ensure that on-off circuit is operated in DCM, and DCM is entered and had after certain depth, just starts spread spectrum, so as to avoid on-off circuit work
Work begins to spread spectrum in CCM.
Specifically, step S3, when the very first time be less than the first set time when, by the week of the Continuity signal of first switch pipe
Phase was adjusted to for the second set time, specifically can include：When the very first time being less than for the first set time, opened by adjusting first
Close pipe ON time with by the period modulation of the Continuity signal of first switch pipe as the second set time.Further, it is also possible to logical
Overregulate turn-off time of first switch pipe with by the period modulation of the Continuity signal of first switch pipe as the second set time, or
Person, by adjust inductive current ripple with by the period modulation of the Continuity signal of first switch pipe as the second set time.
Specifically, step S4, when the very first time being more than for the first set time, by the second time and the first set time it
Be adjusted to for the second set time, to realize spread spectrum, specifically can include：When the very first time being more than for the first set time, lead to
The ON time of first switch pipe is overregulated so that the second time and the first set time sum are adjusted to into the second set time, with
Realize spread spectrum.Further, it is also possible to pass through to adjust turn-off time of first switch pipe with by the second time and the first set time it
Be adjusted to for the second set time, or, by adjusting inductive current ripple with by the second time and the first set time sum
It was adjusted to for the second set time.
Particular embodiments described above, has carried out entering one to the purpose of this utility model, technical scheme and beneficial effect
Step ground is described in detail, it will be appreciated that the foregoing is only specific embodiment of the utility model, is not used to limit this reality
With new protection domain.Particularly point out, to those skilled in the art, it is all it is of the present utility model spirit and principle it
Interior, any modification, equivalent substitution and improvements done etc. should be included within protection domain of the present utility model.
Claims (8)
1. a kind of control circuit of on-off circuit, be applied in discontinuous conduction mode when the on-off circuit, the switch
Circuit includes first switch pipe and second switch pipe, it is characterised in that the control circuit includes：
Acquisition module, for obtaining the very first time, the very first time leads for the second switch pipe of current operating cycle
Between the trailing edge of messenger and the rising edge of the Continuity signal of the first switch pipe in adjacent subsequent work cycle when
Between；
The comparison module being connected with the acquisition module, for comparing the size of the first set time and the very first time；
The adjusting module being connected with the comparison module, when the very first time first set time is less than, the tune
The period modulation of the Continuity signal of the first switch pipe was the second set time by mould preparation block；It is more than institute when the very first time
When stating for the first set time, the second time and the first set time sum are adjusted to described second and are consolidated by the adjusting module
Fix time, to realize spread spectrum, wherein, second time is the Continuity signal of the first switch pipe of same work period
Time between the trailing edge of the Continuity signal of rising edge and the second switch pipe.
2. the control circuit of on-off circuit according to claim 1, it is characterised in that the acquisition module include OR gate,
Transistor, the first electric capacity and the first current source；Wherein,
The first input end of the OR gate is connected with the Continuity signal of the first switch pipe, the second input of the OR gate with
The Continuity signal connection of the second switch pipe, the output end of the OR gate is connected with the control end of the transistor；The crystalline substance
The first end ground connection of body pipe, the node being connected with the second end of the transistor is first node；The first node is also distinguished
It is connected with the first pole plate of first current source and first electric capacity, the second pole plate ground connection of first electric capacity.
3. the control circuit of on-off circuit according to claim 2, it is characterised in that the comparison module includes that first is electric
Bit comparator, the first input end of first potential comparator is connected with the first node, first potential comparator
The second input current potential be the first reference potential, output end and the adjusting module of first potential comparator connect
Connect, wherein, when first reference potential is the very first time to be equal to first set time, the first node is in institute
State the current potential at the end of the very first time.
4. the control circuit of on-off circuit according to claim 3, it is characterised in that the adjusting module includes edge ratio
The first timing unit of timing and the week of the Continuity signal to the first switch pipe are carried out compared with device, to second set time
The ON time adjustment unit that phase is adjusted；Wherein,
The first input end of the edge comparator is connected with the output end of first potential comparator, the edge comparator
The second input be connected with the output end of first timing unit, the 3rd input of the edge comparator and described
The Continuity signal connection of one switching tube, first output end and the second output end of the edge comparator with the ON time
Adjustment unit connects.
5. the control circuit of on-off circuit according to claim 4, it is characterised in that first timing unit includes the
One switch, the second electric capacity, the second current source and the second potential comparator；Wherein,
The control end of the first switch is connected with the Continuity signal of the first switch pipe, the first termination of the first switch
Ground, the node being connected with the second end of the first switch is Section Point；The Section Point is also electric respectively at described second
The first input end connection of the first pole plate, second current source and second potential comparator that hold, second electric capacity
The second pole plate ground connection；The current potential of the second input of second potential comparator is the second reference potential, and described second is electric
The output end of bit comparator is connected with the first input end of the edge comparator；Wherein, second reference potential is described
When the switch periods of first switch pipe are equal to second set time, a work of the Section Point in the on-off circuit
Make current potential during end cycle.
6. the control circuit of on-off circuit according to claim 4, it is characterised in that the ON time adjustment unit bag
Include second switch, the 3rd current source, the 3rd switch, the 4th current source, the 3rd electric capacity and voltage and turn electric current device；Wherein,
The control end of the second switch is connected with the first output end of the edge comparator, the first end of the second switch
It is connected with the 3rd current source, the node being connected with the second end of the second switch is the 3rd node；3rd node
The first end, the first pole plate of the 3rd electric capacity and the voltage that also switch with the described 3rd respectively turn the input of electric current device
Connection；The control end of the 3rd switch is connected with the second output end of the edge comparator, and the second of the 3rd switch
End is connected with the first end of the 4th current source, the second end of the 4th current source and the second pole plate of the 3rd electric capacity
Connection；The voltage turns the output end of electric current device and is connected with the control signal of the Continuity signal of the first switch pipe.
7. the control circuit of on-off circuit according to claim 1, it is characterised in that characterized in that, described second is solid
Fix time for the on-off circuit be in continuous conduction mode when the first switch pipe switch periods.
8. there are the switch circuit devices of the control circuit as described in claim 1～7 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621010017.6U CN206099768U (en) | 2016-08-31 | 2016-08-31 | Switch circuit's control circuit and switch circuit device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621010017.6U CN206099768U (en) | 2016-08-31 | 2016-08-31 | Switch circuit's control circuit and switch circuit device |
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| CN206099768U true CN206099768U (en) | 2017-04-12 |
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| CN201621010017.6U Expired - Fee Related CN206099768U (en) | 2016-08-31 | 2016-08-31 | Switch circuit's control circuit and switch circuit device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106329918A (en) * | 2016-08-31 | 2017-01-11 | 杰华特微电子（张家港）有限公司 | Control method and control circuit of switching circuit, and switching circuit apparatus |
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2016
- 2016-08-31 CN CN201621010017.6U patent/CN206099768U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106329918A (en) * | 2016-08-31 | 2017-01-11 | 杰华特微电子（张家港）有限公司 | Control method and control circuit of switching circuit, and switching circuit apparatus |
| CN106329918B (en) * | 2016-08-31 | 2018-08-28 | 杰华特微电子（张家港）有限公司 | A kind of control method of switching circuit, control circuit and switch circuit devices |
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