CN108063609A - A kind of frequency control circuit, control method and on-off circuit - Google Patents
A kind of frequency control circuit, control method and on-off circuit Download PDFInfo
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- CN108063609A CN108063609A CN201711455176.6A CN201711455176A CN108063609A CN 108063609 A CN108063609 A CN 108063609A CN 201711455176 A CN201711455176 A CN 201711455176A CN 108063609 A CN108063609 A CN 108063609A
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- 230000001360 synchronised effect Effects 0.000 claims abstract description 76
- 230000001939 inductive effect Effects 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 6
- 101100218965 Arabidopsis thaliana BON2 gene Proteins 0.000 description 12
- 230000000694 effects Effects 0.000 description 4
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- 238000010586 diagram Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/06—Modifications for ensuring a fully conducting state
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
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- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of for the frequency control circuit of Switching Power Supply, control method and on-off circuit, the Switching Power Supply includes switching power circuit, and the switching power circuit includes main power tube and synchronous rectifier.Under discontinuous mode, the main power tube and the synchronous rectifier are turned off, and when timing is to the first time, and thermal compensation signal is never more than first threshold, the synchronous rectifier conducting, and the main power tube is held off；When the thermal compensation signal is more than the first threshold, then the main power tube conducting, the synchronous rectifier turn off.When loading gently to a certain extent, the fixed-frequency control under discontinuous mode can be realized.
Description
Technical field
The present invention relates to power electronics fields, and in particular to a kind of frequency control circuit, control method and switch electricity
Road.
Background technology
In Switching Power Supply, main power tube, rectifying tube and inductance are included.When main power tube turns on, rectifying tube turns off, inductance
Electric current rises；When rectifying tube turns on, main power tube shut-off, inductive current declines.The size of inductive current average value is with load
Variation and change, when load lightens, inductive current drops to 0, into discontinuous mode.Refering to what is shown in Fig. 1, it is inductive current
iL, the oscillogram of main power tube control signal TON and rectifying tube Continuity signal BON.Main power tube control signal TON is height, whole
Flow tube Continuity signal BON is low, and main power tube conducting, rectifying tube turns off, and inductive current rises；Main power tube control signal TON
To be low, rectifying tube Continuity signal BON is height, and main power tube turns off, and rectifying tube conducting, inductive current declines；When under inductive current
Drop to 0, main power tube control signal TON is low, and rectifying tube Continuity signal BON is also to be low, then main power tube and synchronous rectifier
It is turned off.Load is lighter, then the time of main power tube and rectifying tube shut-off is longer, and switch periods are longer, and switching frequency is lower.Cause
This, on-off circuit enters after discontinuous mode, and switching frequency can change with the variation of load.Switching frequency is too low, can produce
Raw audio disturbances generate interference to other systems.Therefore, it is desirable under discontinuous mode, the switching frequency can also be controlled to be
Fixed frequency.
The content of the invention
In view of this, it is an object of the invention to provide a kind of frequency control circuit, control method and on-off circuit, to
It solves on-off circuit in the prior art to enter after discontinuous mode, switching frequency can change with the variation of load.Switch frequency
Rate is too low, can generate audio disturbances or other systems are led to the problem of with interference.
The technical solution of the present invention is to provide a kind of frequency control circuit for Switching Power Supply, the switch electricity
Source includes switching power circuit, and the switching power circuit includes main power tube and synchronous rectifier, described under discontinuous mode
Main power tube and the synchronous rectifier are turned off, and when timing is to the first time, and thermal compensation signal is never more than
First threshold, the synchronous rectifier conducting, the main power tube are held off；When the thermal compensation signal is more than first threshold
Value, then the main power tube conducting, the synchronous rectifier shut-off.
As optional, the timing or from the main work(since being turned off the main power tube and the synchronous rectifier
The conducting of rate pipe starts timing.
As optional, including timing circuit and logic control circuit,
When the timing circuit timing is to first time, the output of the timing circuit becomes effective from invalid, described
Synchronous rectifier turns on, the main power tube shut-off；
The logic control circuit thermal compensation signal and the first threshold, when the thermal compensation signal is more than first
During threshold value, the main power tube conducting, the synchronous rectifier shut-off.
As optional, operational amplifier is further included, the operational amplifier receives reference signal and switching power circuit
Feedback signal, and operation amplifier is carried out to the reference signal and the feedback signal, the thermal compensation signal is obtained, it is described anti-
Feedback signal is feedback voltage, feedback current or the feedback power of the switching power circuit.
As optional, timing, when timing is to constant turn-on time, the main work(are carried out to the main power tube ON time
Rate pipe turns off, the synchronous rectifier conducting.
As optional, reception inductance sample rate current, when the inductance sample rate current is more than the thermal compensation signal, the master
Power tube turns off, the synchronous rectifier conducting.
The another technical solution of the present invention is to provide a kind of control method for frequency for Switching Power Supply, the switch
Power supply includes switching power circuit, and the switching power circuit includes main power tube and synchronous rectifier, under discontinuous mode, institute
It states main power tube and the synchronous rectifier is turned off, when timing is to the first time, and thermal compensation signal is never big
In first threshold, the synchronous rectifier conducting, the main power tube is held off；When the thermal compensation signal is more than described first
Threshold value, then the main power tube conducting, the synchronous rectifier shut-off.
As optional, the timing or from the main work(since being turned off the main power tube and the synchronous rectifier
The conducting of rate pipe starts timing.
As optional, operation amplifier is carried out to the reference signal and the feedback signal, obtains the thermal compensation signal, institute
State feedback voltage, feedback current or the feedback power that feedback signal is the switching power circuit.
As optional, timing, when timing is to constant turn-on time, the main work(are carried out to the main power tube ON time
Rate pipe turns off, the synchronous rectifier conducting.
As optional, inductive current is sampled, when inductance sample rate current is more than the thermal compensation signal, the main work(
Rate pipe turns off, the synchronous rectifier conducting.
The another technical solution of the present invention is to provide a kind of on-off circuit.
Circuit structure using the present invention and method compared with prior art, have the following advantages：When load is gently to certain
Degree can realize the fixed-frequency control under discontinuous mode.
Description of the drawings
Fig. 1 is inductive current i of the switching power circuit under discontinuous mode in the prior artL, main power tube control signal
The oscillogram of TON and synchronous rectifier control signal BON；
Fig. 2 is inductive current i of the switching power circuit of the present invention under discontinuous modeL, main power tube control signal TON,
The oscillogram of synchronous rectifier control signal BON and timing circuit output signal BON2
Fig. 3 is the schematic diagram of frequency control circuit 100 of the present invention, driving circuit 200 and switching power circuit 300；
Fig. 4 is a kind of embodiment of timing circuit 110 of the present invention.
Specific embodiment
The preferred embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any replacement made in the spirit and scope of the present invention, modification, equivalent method and scheme.
In order to which the public is made to have thorough understanding to the present invention, it is described in detail in present invention below preferred embodiment specific
Details, and description without these details can also understand the present invention completely for a person skilled in the art.
More specifically description is of the invention by way of example referring to the drawings in the following passage.It should be noted that attached drawing is adopted
With more simplified form and using non-accurate ratio, only to convenience, the embodiment of the present invention is lucidly aided in illustrating
Purpose.
The present invention provides a kind of frequency control circuit 100, and the Switching Power Supply includes switching power circuit 300, described to open
Closing power circuit 300 includes main power tube and synchronous rectifier, under discontinuous mode, the main power tube and the synchronous rectification
Pipe is turned off, and when timing is to the first time T1, and thermal compensation signal COMP is never more than first threshold V1, described same
Rectifying tube conducting is walked, the main power tube is held off；When the thermal compensation signal COMP be more than the first threshold V1, then it is described
Main power tube turns on, the synchronous rectifier shut-off.
Refering to what is shown in Fig. 2, it is inductive current iL, main power tube control signal TON, synchronous rectifier control signal BON
Oscillogram, for when timing is to the first time T1, and the thermal compensation signal COMP is never more than the first threshold
V1, then synchronous rectifier control signal BON is height, and main power tube control signal TON remains low, synchronous rectifier conducting, main
Power tube is held off.Until the thermal compensation signal COMP is more than the first threshold V1, synchronous rectifier control signal BON is
Low, main power tube control signal TON is height, and synchronous rectifier turns off, main power tube conducting.
In discontinuous mode, when the load, synchronous rectifier conducting before main power tube turns on, in discontinuous mode
Under, make switching frequency close to fixed frequency.The frequency control circuit is simple, easy to implement, and it is good to determine yupin effect.
Since being turned off the main power tube and the synchronous rectifier timing or from the main power tube conducting open
Beginning timing.
When the timing since being turned off the main power tube and the synchronous rectifier, then the main power tube and described same
The time that step rectifying tube is turned off is first time T1.
Refering to what is shown in Fig. 3, the frequency control circuit 100 under discontinuous mode, including timing circuit 110 and logic control circuit
120, when 110 timing of timing circuit is to first time T1, the output BON2 of the timing circuit 110 becomes having from invalid
Effect, the synchronous rectifier conducting, the main power tube shut-off；
The logic control circuit 120 thermal compensation signal COMP and first threshold V1, when the compensation letter
When number COMP is more than first threshold V1, the main power tube conducting, the synchronous rectifier shut-off.
With continued reference to shown in Fig. 3, by exemplified by the timing since being turned off the main power tube and the synchronous rectifier
It illustrates, when main power tube control signal TON is effective, the main power tube conducting；The main power tube control signal TON without
During effect, the main power tube shut-off；When synchronous rectifier control signal BON is effective, the synchronous rectifier conducting；The synchronization
When rectifying tube control signal BON is invalid, the synchronous rectifier shut-off,
It should be noted that it is effective with control signal here, exemplified by switching tube conducting.Can also be control signal without
Effect, switching tube conducting.
Driving circuit 200 receives main power tube control signal TON and synchronous rectifier control signal BON.Main power tube control
When signal TON processed is effective, driving circuit 200 drives main power tube conducting；When the main power tube control signal TON is invalid, drive
Dynamic circuit 200 turns off the main power tube；When synchronous rectifier control signal BON is effective, driving circuit 200 drives described same
Walk rectifying tube conducting；When the synchronous rectifier control signal BON is invalid, driving circuit 200 controls the synchronous rectifier to close
It is disconnected.
The timing circuit 110 receives the main power tube control signal TON and the synchronous rectifier control signal
BON, when the main power tube control signal TON is effective or the synchronous rectifier control signal BON is effective, the timing electricity
Road output BON2 is invalid, and the timing circuit 110 is controlled from the main power tube control signal TON and the synchronous rectifier
Signal BON starts timing when invalid, and when timing is to first time T1, output BON2 becomes effective from invalid, with reference to figure 2
It is shown, it is the waveform of BON2, the logic control circuit 120 receives the output signal BON2 of the timing circuit 110 and described
Thermal compensation signal COMP exports main power tube control signal TON and synchronous rectifier control signal BON,
When the timing circuit 110 output signal BON2 from it is invalid become effective when, synchronous rectifier control letter
Number BON is effective, and the main power tube control signal TON is invalid；120 thermal compensation signal of logic control circuit
The COMP and first threshold V1, when the thermal compensation signal COMP be more than first threshold when V1, the main power tube control signal
TON is effective, and the synchronous rectifier control signal BON is invalid.
Refering to what is shown in Fig. 4, being one embodiment of timing circuit 110, timing circuit 110 includes OR gate 111, switch
K111, current source I111, capacitance C111 and comparator 112.
It is illustrated by working as since being turned off the main power tube and the synchronous rectifier exemplified by timing, main power tube
Control signal TON and synchronous rectifier control signal BON is connected to two input terminals of OR gate 111, the output terminal control of OR gate 111
System switch K111.When the output of OR gate 111 is high, switch K111 conductings when the output of OR gate 111 is low, switch K111
Shut-off.It is in parallel to switch K111 and capacitance C111.One end of current source I111 is connected with capacitance C111, and common port, which is connected to, to be compared
The positive input terminal of device 112.The negative input end receiving voltage V111 of comparator 112.The output of comparator 112 is timing circuit
110 output BON2.
Main power tube control signal TON or synchronous rectifier control signal BON is height, then the output of OR gate 111 is height, is opened
K111 conductings are closed, by the voltage amplitude of capacitance C111 to 0, the output signal BON2 of comparator 112 is low.When main power tube controls
Signal TON and synchronous rectifier control signal BON all for it is low when, current source I111 charges to capacitance C111, when the electricity that charges
When pressure reaches voltage V111, then comparator 112 exports BON2 and is become higher by low.The time that I111 charges to capacitance C111, V111/
I111 is first time T1.
Logic control circuit 120 further includes latch cicuit.Latch cicuit locks the output signal BON2 of timing circuit
It deposits.
When the timing since turning on the main power tube of timing circuit 110, on the basis of Fig. 4, the split control for hanging K111
Signal processed is modified.A kind of method of modification is：When main power tube turns on, control switch K111 is turned off, then timing circuit
110 start timing, and when the output BON2 of timing circuit is high, control switch K111 conductings reset timing circuit 110.
Timing circuit 110 is not limited to above example, it is possibility to have various realization methods, such as using digital meter when side
Formula.
Refering to what is shown in Fig. 3, frequency control circuit 100, further includes operational amplifier 130, the operational amplifier 130 receives
The feedback signal FB of reference signal VREF and switching power circuit, and to the reference signal VREF and the feedback signal FB
Operation amplifier is carried out, obtains the thermal compensation signal COMP, feedback signal FB is not limited to the feedback voltage in Fig. 3, the feedback letter
Number can be the switching power circuit feedback current or feedback power.
In the case where perseverance turns on control model, timing is carried out to the main power tube ON time, when timing to constant turn-on time
When, the main power tube shut-off, the synchronous rectifier conducting.
The logic control circuit 120 carries out timing to the main power tube ON time, when timing to constant turn-on time
When, the main power tube control signal TON is from effectively becoming to be invalid, and the synchronous rectifier control signal BON is from invalid change
To be effective.
Under Peak Current-Mode Controlled Circuit, inductance sample rate current is received, when the inductance sample rate current is more than the compensation
During signal, the main power tube shut-off, the synchronous rectifier conducting.
The logic control circuit 120 receives inductance sample rate current, believes when the inductance sample rate current is more than the compensation
During number COMP, the main power tube control signal TON from effectively becoming to be invalid, the synchronous rectifier control signal BON from
It is invalid to become effective.
A kind of fixed-frequency control method for Switching Power Supply, the Switching Power Supply include driving circuit and switch power electricity
Road, the switching power circuit includes main power tube and synchronous rectifier, under discontinuous mode, the main power tube and described same
Step rectifying tube is turned off, and when timing is to the first time, and thermal compensation signal is never more than first threshold, the synchronization
Rectifying tube turns on, and the main power tube is held off；When the thermal compensation signal is more than the first threshold, the then main power tube
Conducting, the synchronous rectifier shut-off.
Since being turned off the main power tube and the synchronous rectifier timing or from the main power tube conducting open
Beginning timing.
Operation amplifier is carried out to the reference signal and the feedback signal, obtains the thermal compensation signal, the feedback letter
Number be the switching power circuit feedback voltage, feedback current or feedback power.
Timing is carried out to the main power tube ON time, when timing is to constant turn-on time, the main power tube shut-off,
The synchronous rectifier conducting.
Inductive current is sampled, when inductance sample rate current is more than the thermal compensation signal, the main power tube shut-off,
The synchronous rectifier conducting.
The present invention also provides a kind of on-off circuits, include the frequency control circuit.On-off circuit can be that BUCK drops
Volt circuit, BOOST booster circuits, BUCKBOOST step-up/step-down circuits etc..
In addition, although embodiment is separately illustrated and is illustrated above, it is related to the common technology in part, in this field
Those of ordinary skill apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and record is not known
Content, then can refer to another embodiment on the books.
Embodiments described above does not form the restriction to the technical solution protection domain.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements made within the spirit and principle of mode etc., should be included in the protection model of the technical solution
Within enclosing.
Claims (12)
1. a kind of frequency control circuit for Switching Power Supply, the Switching Power Supply includes switching power circuit, the switch work(
Rate circuit includes main power tube and synchronous rectifier, it is characterised in that：Under discontinuous mode, the main power tube with it is described synchronous
Rectifying tube is turned off, and when timing is to the first time, and thermal compensation signal is never more than first threshold, and the synchronization is whole
Flow tube turns on, and the main power tube is held off；When the thermal compensation signal is more than the first threshold, then the main power tube is led
It is logical, the synchronous rectifier shut-off.
2. frequency control circuit according to claim 1, which is characterized in that from the main power tube and the synchronous rectification
Pipe is turned off starting timing or the timing since turning on the main power tube.
3. frequency control circuit according to claim 1, which is characterized in that including timing circuit and logic control circuit,
When the timing circuit timing is to first time, the output of the timing circuit becomes effective from invalid, the synchronization
Rectifying tube turns on, the main power tube shut-off；
The logic control circuit thermal compensation signal and the first threshold, when the thermal compensation signal is more than first threshold
When, the main power tube conducting, the synchronous rectifier shut-off.
4. the frequency control circuit according to Claims 2 or 3, which is characterized in that further include operational amplifier, the computing
Amplifier receives the feedback signal of reference signal and switching power circuit, and to the reference signal and the feedback signal into
Row operation amplifier, obtains the thermal compensation signal, and the feedback signal is feedback voltage, the feedback current of the switching power circuit
Or feedback power.
5. according to the frequency control circuit described in claim 1-3 any one, which is characterized in that the main power tube is turned on
Time carries out timing, when timing is to constant turn-on time, the main power tube shut-off, and the synchronous rectifier conducting.
6. according to the frequency control circuit described in claim 1-3 any one, which is characterized in that inductance sample rate current is received,
When the inductance sample rate current is more than the thermal compensation signal, the main power tube shut-off, the synchronous rectifier conducting.
7. a kind of control method for frequency for Switching Power Supply, the Switching Power Supply includes switching power circuit, the switch work(
Rate circuit includes main power tube and synchronous rectifier, it is characterised in that：Under discontinuous mode, the main power tube with it is described synchronous
Rectifying tube is turned off, and when timing is to the first time, and thermal compensation signal is never more than first threshold, and the synchronization is whole
Flow tube turns on, and the main power tube is held off；When the thermal compensation signal is more than the first threshold, then the main power tube is led
It is logical, the synchronous rectifier shut-off.
8. control method for frequency according to claim 7, which is characterized in that from the main power tube and the synchronous rectification
Pipe is turned off starting timing or the timing since turning on the main power tube.
9. the control method for frequency according to claim 7 or 8, which is characterized in that the reference signal and the feedback
Signal carries out operation amplifier, obtains the thermal compensation signal, the feedback signal for the switching power circuit feedback voltage, anti-
Supply current or feedback power.
10. the control method for frequency according to claim 7 or 8, which is characterized in that the main power tube ON time into
Row timing, when timing is to constant turn-on time, the main power tube shut-off, the synchronous rectifier conducting.
11. the control method for frequency according to claim 7 or 8, which is characterized in that sampled to inductive current, work as electricity
When feeling sample rate current more than the thermal compensation signal, the main power tube shut-off, the synchronous rectifier conducting.
12. a kind of on-off circuit, it is characterised in that：Including the frequency control circuit as described in claim 1~6 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711455176.6A CN108063609B (en) | 2017-12-27 | 2017-12-27 | Frequency control circuit, control method and switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711455176.6A CN108063609B (en) | 2017-12-27 | 2017-12-27 | Frequency control circuit, control method and switching circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108063609A true CN108063609A (en) | 2018-05-22 |
| CN108063609B CN108063609B (en) | 2024-01-23 |
Family
ID=62140560
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711455176.6A Active CN108063609B (en) | 2017-12-27 | 2017-12-27 | Frequency control circuit, control method and switching circuit |
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| Country | Link |
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| CN (1) | CN108063609B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111107691A (en) * | 2018-10-25 | 2020-05-05 | 深圳市必易微电子有限公司 | Solid-state lighting device driving module, switching power supply circuit and dimming method |
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| Publication number | Publication date |
|---|---|
| CN108063609B (en) | 2024-01-23 |
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