CN206878703U - Switching Power Supply and its control circuit - Google Patents
Switching Power Supply and its control circuit Download PDFInfo
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- CN206878703U CN206878703U CN201720583589.1U CN201720583589U CN206878703U CN 206878703 U CN206878703 U CN 206878703U CN 201720583589 U CN201720583589 U CN 201720583589U CN 206878703 U CN206878703 U CN 206878703U
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Abstract
The utility model discloses a kind of Switching Power Supply and its control circuit, the control circuit includes：First logic unit, the input of first logic unit receive clock signal, and the output end of first logic unit produces the inversion signal of the clock signal；Set signal generating module, for producing set signal according to the inversion signal of the clock signal, the inversion signal of the clock signal, comparison signal, Continuity signal and switching signal；And module occurs for switching signal, for producing the switching signal according to the inversion signal of the set signal and the clock signal, with the conducting of controlling switch pipe.It can control across the cycle output of switching signal when Switching Power Supply works in light condition, be exported with reducing energy unnecessary under light condition.
Description
Technical field
It the utility model is related to electron electric power technical field, more particularly to a kind of Switching Power Supply and its control circuit.
Background technology
Switching Power Supply is the turn-on and turn-off using switching signal controlling switch pipe, by the charging to energy-storage travelling wave tube and is put
Electricity maintains the power circuit of stable output.In Switching Power Supply, control circuit produces switching signal, with the conducting of controlling switch pipe
And shut-off.
In the prior art, when Switching Power Supply is operated in Asynchronous Mode, with the continuous reduction of load, switching tube is led
The logical time can be shorter and shorter, i.e. the turn-off time of switching tube can increasingly be grown, and it is also fewer and fewer to be delivered to the energy of output end, but
Only allow electric current one-way conduction due to working in the Switching Power Supply under Asynchronous Mode, cause the energy for being delivered to output end can only
For just.If in the case where load is very light, each clock cycle still continues to transmit positive energy to output end, then output
Energy, which is built up, may result in output voltage rise, cause unnecessary energy loss.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of cycle-skipping that switching signal can be achieved under the conditions of underloading
The Switching Power Supply and its control circuit of phase output.
According to first aspect of the present utility model, there is provided a kind of control circuit for Switching Power Supply, including：First patrols
Volume unit, the input of first logic unit receive clock signal, described in the output end of first logic unit produces
The inversion signal of clock signal；Set signal generating module, for the anti-phase letter according to the clock signal, the clock signal
Number, the inversion signal of comparison signal, Continuity signal and switching signal produce set signal；And module occurs for switching signal,
For producing the switching signal according to the inversion signal of the set signal and the clock signal, with leading for controlling switch pipe
It is logical.
Preferably, the set signal generating module includes：First trigger, the input of first trigger receive
The Continuity signal, the clock end of first trigger receive the inversion signal of the clock signal, first trigger
The first output end produce jump signal, the second output end of first trigger produces the anti-phase letter of the jump signal
Number；Second trigger, the input of second trigger receive the jump signal, the clock termination of second trigger
Receive the clock signal, the output end output sampled signal of second trigger；3rd trigger, the 3rd trigger
Input receives the comparison signal, and the clock end of the 3rd trigger receives the clock signal；Second logic unit, institute
The first input end for stating the second logic unit receives the jump signal, and the second input of second logic unit receives institute
State the inversion signal of switching signal, the output end of second logic unit be connected to second trigger reset terminal and
The reset terminal of 3rd trigger；And the 3rd logic unit, described in the first input end of the 3rd logic unit receives
Sampled signal, the second input of the 3rd logic unit are connected to the output end of the 3rd trigger.
Preferably, the set signal generating module also includes the 4th logic unit, and the first of the 4th logic unit
Input receives the jump signal, and the second input of the 4th logic unit receives the sampled signal；5th logic
Unit, the first input end of the 5th logic unit receive the comparison signal, the second input of the 5th logic unit
End is connected to the output end of the 4th logic unit；6th logic unit, the first input end of the 6th logic unit connect
The clock signal is received, the second input of the 6th logic unit is connected to the second output end of first trigger；
7th logic unit, the first input end of the 7th logic unit is connected to the output end of the 5th logic unit, described
Second input of the 7th logic unit is connected to the output end of the 3rd logic unit, the output of the 7th logic unit
End exports new comparison signal；8th logic unit, the first input end of the 8th logic unit are connected to the 6th logic
The output end of unit, the second input of the 8th logic unit receive the new comparison signal, the 8th logic unit
Output end produce set signal.
Preferably, module, which occurs, for the switching signal includes：4th trigger, the first input end of the 4th trigger
Receiving the set signal, the second input of the 4th trigger receives the inversion signal of the clock signal, and described the
First output end of four triggers exports the switching signal, the second output end output switch letter of the 4th trigger
Number inversion signal.
Preferably, first logic unit is NOT gate, it is described second, third, the 5th and the 6th logic unit be with
Door, the 4th logic unit is NAND gate, and the seven, the 8th logic unit is OR gate.
Preferably, the described first to the 3rd trigger is d type flip flop, and the 4th trigger is rest-set flip-flop, and described
The reset terminal low level of second trigger and the 3rd trigger is effective.
According to second aspect of the present utility model, there is provided a kind of Switching Power Supply, including main circuit；It is and hereinbefore any
Control circuit described in, wherein, the main circuit includes switching tube, the control circuit control the conducting of the switching tube with
Shut-off.
Preferably, it is anti-to include booster type topology, buck topology, buck-boost type topological sum for the circuit types of the main circuit
Swash type topology.
Compared to prior art, the control circuit of the offer of the utility model embodiment can be in Switching Power Supply underload
Across the cycle output of controlling switch signal, reduce unnecessary energy output under the conditions of underloading.
Brief description of the drawings
By the description to the utility model embodiment referring to the drawings, of the present utility model above-mentioned and other mesh
, feature and advantage will be apparent from.
Fig. 1 shows the structure chart for the Switching Power Supply that the utility model first embodiment provides.
Fig. 2 shows the structure chart of the control circuit used in the Switching Power Supply that the utility model first embodiment provides.
Fig. 3 shows the circuit diagram of control circuit shown in Fig. 2.
Fig. 4 shows the working waveform figure under the working condition of control circuit first shown in Fig. 3.
Fig. 5 shows the working waveform figure under the working condition of control circuit second described in Fig. 3.
Embodiment
The utility model is more fully described hereinafter with reference to accompanying drawing.In various figures, identical element is using similar
Reference represent.For the sake of clarity, the various pieces in accompanying drawing are not necessarily to scale.In addition, may in figure
Some known parts are not shown.
Many specific details of the present utility model are describe hereinafter, to be more clearly understood that the utility model.
But just as the skilled person will understand, it can not realize that this practicality is new according to these specific details
Type.
Fig. 1 shows the structure chart for the Switching Power Supply that the utility model first embodiment provides.
As shown in figure 1, the Switching Power Supply 100 that the utility model first embodiment provides is, for example, booster type (BOOST), open
Powered-down source 100 has reception DC input voitage Vin input and for providing the defeated of VD Vout for load
Go out end.The main circuit of Switching Power Supply 100 includes electric capacity Cin and Cout, resistance RF1 and RF2, switching tube M1, diode D1, inductance
L1 and comparator U1.The control circuit 110 of Switching Power Supply 100 provides switching signal Vg for switching tube M1.
In the main circuit of Switching Power Supply 100, electric capacity Cin is connected between input and ground, for inputting electricity to direct current
Pressure Vin is filtered.Electric capacity Cout is connected between output end and ground, for providing VD Vout.Inductance L1 and
Switching tube M1 is connected in series between input and ground.Switching tube M1 has first end, the second end and control terminal.Switching tube M1's
Control terminal receives switching signal Vg, and electric current flow to the second end from first end in the on-state.Diode D1 anode connects
Inductance L1 and switching tube M1 intermediate node are connected on, diode D1 negative electrode is connected to output end.Resistance RF1 and RF2 are series at
Between output end and ground, comparator U1 in-phase input end is connected to resistance RF1 and RF2 intermediate node, and comparator U1's is anti-
Phase input receives reference voltage Vref, comparator U1 output end output comparison signal compout, comparison signal compout
For characterizing output voltage Vout and reference voltage Vref relation.
The control circuit 110 of Switching Power Supply 100 connects the input and output end and switching tube for transporting to main circuit respectively
M1 control terminal.
During switching tube M1 conducting, inductance L1 and switching tube M1 intermediate node is grounded via switching tube M1, two poles
Pipe D1 reversely ends.DC input voitage Vin gives inductance L1 chargings, and inductive current IL flows through inductance L1 and linearly increasing.Two poles
Pipe D1 prevents electric capacity Cout from being discharged via switching tube M1, so as to maintain the VD Vout at electric capacity Cout both ends.
During switching tube M1 shut-off, due to inductance L1 electric current retention performance, inductive current IL continues flow through inductance
L1, inductive current IL linearly reduce.The reversing at inductance L1 both ends so that diode D1 forward conductions.Inductive current IL gives
Electric capacity Cout is charged, and VD Vout is produced at electric capacity Cout both ends.Now, the direct current output at electric capacity Cout both ends
Voltage Vout is higher than DC input voitage Vin.
Fig. 2 shows the structure chart of the control circuit used in the Switching Power Supply that the utility model first embodiment provides.
As shown in Fig. 2 the control circuit 110 used in the Switching Power Supply that the utility model first embodiment provides is including non-
Module 112 occurs for door NOT, set signal generating module 111 and switching signal.
NOT gate NOT receives clock signal clk, and exports clock signal clk inversion signal；Set signal generating module
111 according to clock signal clk, clock signal clk inversion signal, the inversion signal vgb of switching signal, Continuity signal ton
And comparison signal compout produces set signal set；Switching signal occurs module 112 and believed according to set signal set and clock
Number clk inversion signal produces the switching signal vg and inversion signal vgb of the switching signal.
Fig. 3 shows the circuit diagram of control circuit shown in Fig. 2.
As shown in figure 3, the control circuit 110 used in the Switching Power Supply 100 that the utility model first embodiment provides is wrapped
Include NOT gate NOT, set signal generating module 111 and switching signal and module 112 occurs.
NOT gate NOT receives clock signal clk, and exports clock signal clk inversion signal.
Set signal generating module 111 includes first to the 3rd trigger DFF1, DFF2, DFF3, NAND gate NAND, first
To the 4th and door AND1, AND2, AND3, AND4 and the first to the second OR gate OR1, OR2.First trigger DFF1 input
The clock end for receiving Continuity signal ton, the first trigger DFF1 receives clock signal clk inversion signal, the first trigger
The second output end that DFF1 the first output end produces jump signal skip, the first trigger DFF1 produces jump signal skip's
Inversion signal；When the clock end that second trigger DFF2 input receives jump signal skip, the second trigger DFF2 receives
Clock signal clk, the second trigger DFF2 output end produce sampled signal skip_sample；3rd trigger DFF3 input
The clock end that end receives comparison signal compout, the 3rd trigger DFF3 receives clock signal clk；First and the of door AND1
One input receives jump signal skip, and first and door AND1 the second input receives switching signal vg inversion signal vgb,
First and door AND1 output end is connected to the second trigger DEE2 reset terminal and the 3rd trigger DFF3 reset terminal；With
NOT gate NAND first input end receives jump signal skip, and NAND gate NAND the second input receives sampled signal skip_
sample；The second input that second and door AND2 first input end receives comparison signal compout, second and door AND2 connects
It is connected to NAND gate NAND output end；3rd and door AND3 first input end receives clock signal clk, and the 3rd with door AND3's
Second input receives jump signal skip inversion signal；4th and door AND4 first input end receives sampled signal
Skip_sample, the 4th and door AND4 the second input are connected to the 3rd trigger DFF3 output end；First OR gate OR1
First input end be connected to the output end of the 3rd and door AND3, the first OR gate OR1 the second input is connected to the 4th and door
AND4 output end, the first OR gate OR1 output end produce new comparison signal new_compout；The first of second OR gate OR2 is defeated
Enter end and be connected to the 3rd output end with door AND3, the second OR gate OR2 the second input is connected to the first OR gate OR1 output
End, the second OR gate OR2 output end produce set signal set, wherein, the first to the 3rd trigger DFF3 is edging trigger
D type flip flop, and the second trigger DFF2 and the 3rd trigger DFF3 reset terminal is that low level is effective.
Module 112, which occurs, for switching signal includes the 4th trigger DFF4, and the 4th trigger DFF4 first input end receives
Set signal set, the 4th trigger DFF4 the second input receive clock signal clk inversion signal, the 4th trigger
The second output end that DFF4 the first output end produces switching signal vg, the 4th trigger DFF4 produces the anti-phase of switching signal vg
Signal vgb, wherein, the 4th trigger DFF4 is rest-set flip-flop.
Fig. 4 shows the working waveform figure under the working condition of control circuit first shown in Fig. 3.
As shown in figure 4, in the N clock cycle, in moment t0, clock signal clk is low level by high level saltus step, conducting
Signal ton is high level, and for the first trigger DFF1, clock signal clk trailing edge samples the Continuity signal of high level
Ton, illustrate the light load of current switch power supply, now jump signal skip is high level by low transition, sampled signal
Skip_sample and new comparison signal new_compout continues to keep low level, and switching signal vg is low electricity by high level saltus step
Flat, energy-storage travelling wave tube starts to discharge.
T1 at the time of within this cycle, comparison signal compout are high level by low transition, show to switch electricity this moment
The load in source is still not light enough, the condition still not up to across the cycle, and now control circuit is operated in the first working condition, jump signal
Skip continues to keep high level, and sampled signal skip_sample and new comparison signal new_compout continue to keep low level,
Switching signal is high level by low transition, and energy-storage travelling wave tube starts to charge up.
Fig. 5 shows the working waveform figure under the working condition of control circuit second shown in Fig. 3.
As shown in figure 5, in the N clock cycle, in moment t0, clock signal clk is low level by high level saltus step, conducting
Signal ton is high level, and for the first trigger DFF1, clock signal clk trailing edge samples the Continuity signal of high level
Ton, illustrates the light load of current switch power supply, and jump signal skip is high level by low transition, sampled signal skip_
Sample and new comparison signal new_compout continues to keep low level, and switching signal vg is low level by high level saltus step,
Energy-storage travelling wave tube starts to discharge.
Until this clock cycle terminates by moment t0, comparison signal compout remains low level, shows this moment
The load of Switching Power Supply is light enough, and now control circuit is operated in the second working condition, and switching signal vg is ensuing
Continue to keep low level in several clock cycle.Until moment t1, clock signal clk is high level by low transition, conducting
Signal ton is high level by low transition, and comparison signal compout is high level, jump signal skip and sampled signal
Skip_sample continues to keep high level, and new comparison signal new_compout is high level by low transition, switching signal
Vg is high level by high level saltus step, starts next switch periods, and energy-storage travelling wave tube starts to charge up.
Relative to prior art, the control circuit of the offer of the utility model embodiment can be in Switching Power Supply underload
Across the cycle output of controlling switch signal, reduce unnecessary energy output under the conditions of underloading.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply and deposited between these entities or operation
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability includes, so that process, method, article or equipment including a series of elements not only will including those
Element, but also the other element including being not expressly set out, or it is this process, method, article or equipment also to include
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Other identical element also be present in process, method, article or equipment including the key element.
According to embodiment of the present utility model as described above, these embodiments do not have all details of detailed descriptionthe,
Also it is only described specific embodiment not limit the utility model.Obviously, as described above, many modification and change can be made
Change.This specification is chosen and specifically describes these embodiments, is to preferably explain that principle of the present utility model and reality should
With so that skilled artisan can repairing using the utility model and on the basis of the utility model well
Change use.
Claims (8)
- A kind of 1. control circuit for Switching Power Supply, it is characterised in that including：First logic unit, the input of first logic unit receive clock signal, the output of first logic unit End produces the inversion signal of the clock signal；Set signal generating module, for according to the clock signal, the inversion signal of the clock signal, comparison signal, lead Messenger and the inversion signal of switching signal produce set signal；AndModule occurs for switching signal, for carrying out set operation according to the set signal, according to the anti-phase of the clock signal Signal carries out reset operation, so as to produce the switching signal, with the conducting of controlling switch pipe,Wherein, the set signal generating module judges light condition according to the comparison signal, and when judging underloading, it is right Set signal carries out hop cycle.
- 2. control circuit according to claim 1, it is characterised in that the set signal generating module includes：First trigger, the input of first trigger receive the Continuity signal, the clock end of first trigger The inversion signal of the clock signal is received, the first output end of first trigger produces jump signal, and described first touches The second output end for sending out device produces the inversion signal of the jump signal；Second trigger, the input of second trigger receive the jump signal, the clock end of second trigger Receive the clock signal, the output end output sampled signal of second trigger；3rd trigger, the input of the 3rd trigger receive the comparison signal, the clock end of the 3rd trigger Receive the clock signal；Second logic unit, the first input end of second logic unit receive the jump signal, the second logic list Second input of member receives the inversion signal of the switching signal, and the output end of second logic unit is connected to described the The reset terminal of the reset terminal of two triggers and the 3rd trigger；And3rd logic unit, the first input end of the 3rd logic unit receive the sampled signal, the 3rd logic list Second input of member is connected to the output end of the 3rd trigger.
- 3. control circuit according to claim 2, it is characterised in that the set signal generating module also includes：4th logic unit, the first input end of the 4th logic unit receive the jump signal, the 4th logic list Second input of member receives the sampled signal；5th logic unit, the first input end of the 5th logic unit receive the comparison signal, the 5th logic list Second input of member is connected to the output end of the 4th logic unit；6th logic unit, the first input end of the 6th logic unit receive the clock signal, the 6th logic list Second input of member is connected to the second output end of first trigger；7th logic unit, the first input end of the 7th logic unit are connected to the output end of the 5th logic unit, Second input of the 7th logic unit is connected to the output end of the 3rd logic unit, the 7th logic unit Output end exports new comparison signal；And8th logic unit, the first input end of the 8th logic unit are connected to the output end of the 6th logic unit, Second input of the 8th logic unit receives the new comparison signal, and the output end of the 8th logic unit, which produces, puts Position signal.
- 4. control circuit according to claim 3, it is characterised in that module, which occurs, for the switching signal includes：4th trigger, the first input end of the 4th trigger receive the set signal, and the of the 4th trigger Two inputs receive the inversion signal of the clock signal, the first output end output switch letter of the 4th trigger Number, the second output end of the 4th trigger exports the inversion signal of the switching signal.
- 5. control circuit according to claim 3, it is characterised in that first logic unit is NOT gate, described second, Three, the 5th and the 6th logic unit is is NAND gate with door, the 4th logic unit, the seven, the 8th logic list Member is OR gate.
- 6. control circuit according to claim 4, it is characterised in that the described first to the 3rd trigger is d type flip flop, institute It is rest-set flip-flop to state the 4th trigger, and the reset terminal low level of second trigger and the 3rd trigger is effective.
- A kind of 7. Switching Power Supply, it is characterised in that including：Main circuit；AndAccording to the control circuit any one of claim 1-6,Wherein, the main circuit includes switching tube, and the control circuit controls the turn-on and turn-off of the switching tube.
- 8. Switching Power Supply according to claim 7, it is characterised in that the circuit types of the main circuit is opened up including booster type Flutter, buck topology, buck-boost type topological sum flyback topology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720583589.1U CN206878703U (en) | 2017-05-23 | 2017-05-23 | Switching Power Supply and its control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720583589.1U CN206878703U (en) | 2017-05-23 | 2017-05-23 | Switching Power Supply and its control circuit |
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| Publication Number | Publication Date |
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| CN206878703U true CN206878703U (en) | 2018-01-12 |
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| CN201720583589.1U Active CN206878703U (en) | 2017-05-23 | 2017-05-23 | Switching Power Supply and its control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107040136A (en) * | 2017-05-23 | 2017-08-11 | 北京集创北方科技股份有限公司 | Switching Power Supply and its control circuit |
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2017
- 2017-05-23 CN CN201720583589.1U patent/CN206878703U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107040136A (en) * | 2017-05-23 | 2017-08-11 | 北京集创北方科技股份有限公司 | Switching Power Supply and its control circuit |
| CN107040136B (en) * | 2017-05-23 | 2023-07-25 | 北京集创北方科技股份有限公司 | Switching power supply and control circuit thereof |
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