CN206023567U - Switching Power Supply modulation circuit and Switching Power Supply - Google Patents
Switching Power Supply modulation circuit and Switching Power Supply Download PDFInfo
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- CN206023567U CN206023567U CN201620986762.8U CN201620986762U CN206023567U CN 206023567 U CN206023567 U CN 206023567U CN 201620986762 U CN201620986762 U CN 201620986762U CN 206023567 U CN206023567 U CN 206023567U
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- power supply
- switching power
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- modulation circuit
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Abstract
This utility model provides a kind of Switching Power Supply modulation circuit, including：Square wave generation circuit and asynchronous reset circuit；Wherein, the asynchronous reset circuit is all connected with the output feedback end of side's wave generation circuit and Switching Power Supply, voltage swing for the output feedback end according to the Switching Power Supply produces reset signal, and the reset signal is sent to side's wave generation circuit；Side's wave generation circuit is used for receiving the reset signal, produces pulse signal according to the reset signal and exports the pulse signal.The Switching Power Supply modulation circuit that this utility model is provided eliminates the period element of original modulated signal, dutycycle element, and circuit structure is greatly simplified；Feedback signal can fall too low load regulation the voltage compression of whole threshold fluctuations section into a certain fixed voltage value；Additionally, the Switching Power Supply modulation circuit that this utility model is provided is in little loaded work piece, efficiency will not also be decreased obviously.
Description
Technical field
This utility model is related to switch power technology field, and in particular to a kind of Switching Power Supply modulation circuit and a kind of switch
Power supply.
Background technology
Switching Power Supply (switching regulator) typically has three kinds of basic modulation schemes：Pulse width modulation (PWM), pulse frequency
Modulation (PFM), pulse density modulated (PDM).
1) pulse width modulation, i.e. pulsewidth modulation.Be characterized in switching signal cycle be steady state value, by adjust pulse
Width is changing dutycycle.This scheme is applied most universal in Switching Power Supply.
2) pulse frequency modulated, i.e. pulse frequency modulation.Be characterized in switching signal pulse width be steady state value, by adjust
Signal period changes dutycycle.
3) the close modulation of pulse density modulated, i.e. arteries and veins.Be characterized in switching signal pulse width be steady state value, by adjust
Number of pulses is realizing voltage stabilizing purpose.
Switching Power Supply by one or two the combination in above-mentioned three kinds basic modulation schemes come regulating switch element, and
A complete degeneration factor is constituted with the feedback signal of output stage, the purpose of voltage stabilizing is realized.
But above-mentioned three kinds of modulation schemes implement the circuit (such as triangular wave or sawtooth generator) for being required for complexity；?
In feedback signal, some threshold value is that this also causes output voltage to have certain threshold value ripple as linear regulation response signal
Dynamic, make load regulation higher；The response speed of PWM and PFM is also limited by the signal period, and feedback signal needs to wait after reaching
Next cycle just responds；Little when loading in PWM scheme, when dutycycle is less, increase can the switch this consumption ratio of switch element,
Have a strong impact on efficiency.
Utility model content
For above-mentioned defect of the prior art, this utility model provides a kind of Switching Power Supply modulation circuit and corresponding one
Switching Power Supply is planted, to solve the above problems.
In a first aspect, this utility model provides a kind of Switching Power Supply modulation circuit, it is characterised in that include：Square wave occurs
Circuit and asynchronous reset circuit；Wherein,
The asynchronous reset circuit is all connected with the output feedback end of side's wave generation circuit and Switching Power Supply, for root
Reset signal is produced according to the voltage swing of the output feedback end of the Switching Power Supply, and the reset signal is sent to the side
Wave generation circuit；
Side's wave generation circuit be used for receive the reset signal, according to the reset signal produce pulse signal and
Export the pulse signal.
Optionally, side's wave generation circuit is realized using multi-resonant oscillating circuit.
Optionally, when the multi-resonant oscillating circuit adopts 555, base chip is realized.
Optionally, when the asynchronous reset circuit adopts described 555, base chip and audion are realized.
Optionally, the base stage of the audion is connected with the output feedback end of the Switching Power Supply, the collection of the audion
Electrode is connected with the forced resetting pin of base chip when described 555, the emitter stage of the audion and base chip when described 555
Output pin connects.
Optionally, when the asynchronous reset circuit adopts described 555, base chip and triode type photoelectrical coupler are realized.
Optionally, the input anode of the triode type photoelectrical coupler is connected with the output feedback end of the Switching Power Supply
Connect, the input negative electrode of the triode type photoelectrical coupler connects output feedback signal ground, the triode type photoelectrical coupler
Colelctor electrode be connected with the forced resetting pin of base chip when described 555, when the emitter stage of the photoelectrical coupler is with described 555
The output pin connection of base chip.
Optionally, described 555 when base chip be using TTL techniques 555 when base chip.
Optionally, described 555 when base chip be using CMOS technology 555 when base chip.
Second aspect, this utility model provide a kind of Switching Power Supply, including：Described in any one that this utility model is provided
Switching Power Supply modulation circuit.
Compared with prior art, this utility model has advantages below：
A kind of Switching Power Supply modulation circuit that this utility model is provided, including：Square wave generation circuit and asynchronous reset circuit；
Wherein, the asynchronous reset circuit is all connected with the output feedback end of side's wave generation circuit and Switching Power Supply, for basis
The voltage swing of the output feedback end of the Switching Power Supply produces reset signal, and the reset signal is sent to the square wave
Generation circuit；Side's wave generation circuit be used for receive the reset signal, according to the reset signal produce pulse signal with
And export the pulse signal.The Switching Power Supply modulation circuit that this utility model is provided, based on brand-new collection switch electricity
The voltage signal of the output feedback end in source is used as feedback signal, and then the modulation mechanism being modulated in response to feedback signal, can
To substitute above-mentioned three kinds basic modulation schemes of the prior art.The Switching Power Supply modulation circuit that this utility model is provided is saved
Period element, the dutycycle element of original modulated signal, circuit structure has been gone to greatly simplify；Feedback signal can be whole threshold value
The voltage compression of fluctuation section falls too low load regulation into a certain fixed voltage value；Additionally, this utility model is provided
The Switching Power Supply modulation circuit in little loaded work piece, efficiency will not also be decreased obviously.
A kind of Switching Power Supply that this utility model is provided, employs above-mentioned Switching Power Supply modulation circuit, with above-mentioned switch electricity
Source modulation circuit is conceived based on identical utility model, with identical beneficial effect.
Description of the drawings
In order to be illustrated more clearly that this utility model specific embodiment or technical scheme of the prior art, below will be right
Needed for specific embodiment or description of the prior art, accompanying drawing to be used is briefly described.In all of the figs, similar
Element or part are typically identified by similar reference.In accompanying drawing, each element or part might not be according to actual ratios
Draw.
Fig. 1 shows a kind of structural representation of Switching Power Supply modulation circuit that this utility model first embodiment is provided
Figure；
Fig. 2 shows a kind of circuit diagram of Switching Power Supply modulation circuit that this utility model second embodiment is provided；
Fig. 3 shows a kind of circuit diagram of Switching Power Supply modulation circuit that this utility model 3rd embodiment is provided.
Specific embodiment
The embodiment of technical solutions of the utility model is described in detail below in conjunction with accompanying drawing.Following examples are only
For the technical solution of the utility model is described clearly, example is therefore intended only as, and this reality can not be limited with this
With new protection domain.
It should be noted that unless otherwise stated, technical term used in this application or scientific terminology should be this reality
The ordinary meaning understood with new one of ordinary skill in the art.
Fig. 1 is refer to, a kind of structure of its Switching Power Supply modulation circuit provided by this utility model first embodiment
Schematic diagram, the Switching Power Supply modulation circuit, including：Square wave generation circuit 101 and asynchronous reset circuit 102；Wherein,
The asynchronous reset circuit 102 is connected with the output feedback end 103 of side's wave generation circuit 101 and Switching Power Supply
Connect, the voltage swing for the output feedback end 103 according to the Switching Power Supply produces reset signal, and by the reset signal
Send to side's wave generation circuit 101；
Side's wave generation circuit 101 is used for receiving the reset signal, produces pulse signal according to the reset signal
And export the pulse signal.
In this utility model embodiment, side's wave generation circuit 101 for example be able to can be utilized by numerous embodiments
Hysteresis comparator builds simple square wave generation circuit, it would however also be possible to employ more complicated multi-resonant oscillating circuit realizes which is at this
Within the protection domain of utility model.
This utility model embodiment preferably uses multi-resonant oscillating circuit as square wave generation circuit, in the specific implementation,
When can adopt 555, base chip realizes that base chip is also referred to as 555 time base circuits, 555 integrated circuits or 555 intervalometers when 555.
When 555, base chip is currently widely used in various electronic products, when 555 due to reliable operation, easy to use, cheap
Base chip internal has tens components and parts, has potentiometer, comparator, basic R-S flip-flop, discharge tube and buffer etc., electricity
Road is more complicated, is the mixture of analog circuit and digital circuit, can produce accurate time delay and concussion.
When typical 555, base chip is the encapsulation of 8 feet, and Dual-In-Line type, wherein 6 feet claim threshold value end (TH), are upper comparators
Input；2 feet claim triggering end (TR), are the inputs of lower comparator；3 feet are outfan (Vo), and it has O and 1 two states, by defeated
Enter the added level in end to determine；7 feet are discharge end (DIS), and it is the output of internal discharge pipe, have hanging and two kinds of shapes of ground connection
State, and the Determines by input；4 feet are reset terminal (MR), can make to be output as low level when adding low level；5 feet are
Control voltage end (Vc), can change upper and lower triggering level value with it；8 feet are power ends, and 1 foot is ground terminal.
In this utility model embodiment, base chip and audion when the asynchronous reset circuit 102 can adopt described 555
Realize, specifically, the base stage of the audion can be connected with the output feedback end 103 of the Switching Power Supply, three pole
The colelctor electrode of pipe is connected with the forced resetting pin of base chip when described 555, the emitter stage of the audion and base when described 555
The output pin connection of chip, so as to utilize base chip and the audion when described 555 to constitute asynchronous reset circuit 102.
In order to realize this utility model Switching Power Supply modulation circuit input for providing and the electric isolution for exporting, in this reality
In one embodiment with new offer, above-mentioned audion, the asynchronous reset can be replaced with triode type photoelectrical coupler
When circuit 102 adopts described 555, base chip and triode type photoelectrical coupler are realized.Specifically, can be by the triode type
The input anode of photoelectrical coupler is connected with the output feedback end 103 of the Switching Power Supply, the triode type photoelectric coupling
The input negative electrode of device connects output feedback signal ground, the colelctor electrode of the triode type photoelectrical coupler and base core when described 555
The forced resetting pin connection of piece, the emitter stage of the photoelectrical coupler are connected with the output pin of base chip when described 555.
(base when ambipolar 555 of base chip when base chip can be divided into 555 using TTL techniques according to producing principle when 555
Chip) and using CMOS technology 555 when base chip (base chip during CMOS-type 555), this utility model embodiment can basis
Actual demand selects to use, and for example, using base chip when ambipolar 555, is not required between reset terminal pin 4 and chip power supply voltage
Series resistor is wanted, can further simplify circuit；Using base chip during CMOS-type 555, further can reduce modulating power consumption.
The principle of the Switching Power Supply modulation circuit that this utility model embodiment is provided is modulated for impulse response, its principle
For：
Set：
Pulse retention time ton(a certain steady state value, according to actual set)
Delay time t after end-of-pulsingoff(a certain steady state value, according to actual set)
Waiting time twait(changing value changed within 0～∞ times)
tonIn time, modulated signal output high level (positive logic)；toffAnd twaitIn time, modulated signal exports low electricity
Flat (positive logic).
One of pulse retention time tonFollowed by delay time t after an end-of-pulsingoff, referred to as one response
Unit tresponse, it is denoted as trsp(trsp=ton+toff).
Whole modulation output is by response units trspWith waiting time twaitConstitute, trspAnd twaitBetween can not mutually overlap (with
Itself can not overlap).
In twaitIn time, the moment monitors the feedback signal of output voltage, when feedback signal is less than a certain setting value, stands
Terminate twaitPattern, while carry out response units trsp；One response units trspThe waiting time is immediately switched to after end
twaitPattern.Circulate this step.
Note：As two adjacent trspBetween twaitVery little (twait→ 0), it is considered as trspArrive trspBetween direct switching
(twait=0).
Data analysiss are carried out with ideal element.
Definition：
Topological inductance L
Topological input capacitance Cin
Topological output capacitance Cout
Topological charging and discharging circuit internal resistance R0
Electric current I in topological inductanceL
When just having started to induction charging, inductance last time remaining electric current IL′
When inductance just externally discharges, inductance last time remaining electric current IL″
Topological input voltage Uin
Topological output voltage Uout
Induction charging voltage UL
Retention time t after switch element unlatchingon
Retention time t after switch element closingoff
U wherein in tandem type topological structureL=Uin-Uout, U in parallel connection type topological structureL=Uin.
The various topological structure of Switching Power Supply can be seen as ULTo L (some adopt transformator, but analysis principle is similar,
Tired stating is not done here) single order charges, then the cyclic process for the energy in L being discharged into output stage.For tandem type topological structure,
Due to each, the change in voltage very little of output stage electric capacity, i.e. Δ U shorter to the induction charging timeLVary less, this conclusion
Set up.
During to induction charging：
Due to t in practical applicationon＜ ＜ τ, can regard t ason→0(IL' which is affected to ignore)：
Calculate：
A part (the mistakes of the L to C discharge currents in the LC parallel connection concussion cycles that L and C is constituted during to inductive discharge, can be regarded as
Zero moment), in topological circuit wherein in parallelUC=Uout-Uin, C=C in series topology circuitout,UC=Uout：
In due to practical applicationAndT can be regarded asoff→0：
Calculate：
Inductance is discharged：
IL=0, (IL=0)
Can be drawn by the charge formula and electric discharge formula of inductance：
Inductive current increases with charging interval direct ratio, reduces (till being reduced to 0) with discharge time direct ratio.
Start-up time with certain response impulse as zero moment, next pulse arrive before Switching Power Supply prime backward
The energy of level transmission is with time t (t >=trsp) be:
In tandem type topological structure:
In parallel connection type topological structure:
Herein
Switching Power Supply in normal work is considered as input stage and output step voltage is constant, and energy is a from input stage
Process of the part to output stage transmission.The correspondingly each transmission energy of each response units of the impulse response modulation principle.
Switching Power Supply carries the impulse response modulation scheme, one response units process of analysis and multiple continuous response units
Process, effectively can work.
Consider that the internal resistance of switching component, switch such as consume at the factor, inductive current be difficult to increase excessive, after opening every time
Retention time is difficult too short, t in response unitsonAnd toffReasonable value, Switching Power Supply should be selected to be operated in continuous mode and Fei Lian
Discontinuous Conduction mode.
In each response units of the modulation scheme, all at least one discharge time that fixes, effectively limits inductive current
The upper limit.When little load or zero load, in the modulation scheme, adjacent two response units interval can respond increase, and pulse width is not
Become, be effectively guaranteed efficiency.
The impulse response modulation scheme has the following advantages：Period element, the dutycycle element of original modulated signal is eliminated,
Only with feedback response pattern；Feedback is without waiting for next periodic response simultaneously；Electricity of the feedback signal whole threshold fluctuations section
It is compressed into a certain fixed voltage value；The information of signal only has two kinds, and one kind is that output voltage meets or exceeds preset value, needs
Treat, another kind is that output voltage does not reach preset value, needs response impulse；Pulse width is constant.
The Switching Power Supply modulation circuit that this utility model embodiment is provided is based on above-mentioned impulse response modulation scheme, tool
There is identical beneficial effect.
Fig. 2 is refer to, a kind of circuit of its Switching Power Supply modulation circuit provided by this utility model second embodiment
Figure, when the Switching Power Supply modulation circuit provided by this utility model second embodiment adopts 555, base chip is realized, in Fig. 2,
VDD is chip power supply voltage；Uout is switch power source output voltage；Uout-GND is Switching Power Supply output ground；PRM is rung for pulse
The output (pulse signal of as Switching Power Supply modulation circuit final output, switch element can be directly driven) that should be modulated, other
Each components and parts symbol is electronic circuit technology field general symbol(s), and concrete annexation refer to shown in accompanying drawing.
In the utility model embodiment, high level is only dependent upon R1C1, and low level is only dependent upon R2C2.
The a resistance additionally, diode between 2 and 3 pins can be connected again, reduces the rise time of output signal, but its
Resistance selection should ensure that pulse width is consistent with continuous impulse width first after resetting.
Fig. 3 is refer to, a kind of circuit of its Switching Power Supply modulation circuit provided by this utility model 3rd embodiment
Figure, when the Switching Power Supply modulation circuit provided by this utility model 3rd embodiment adopts 555, base chip is realized, and is adopted
Triode type photoelectrical coupler is electrically insulated, and in Fig. 3, VDD is chip power supply voltage；Uout is Switching Power Supply output electricity
Pressure；Uout-GND is Switching Power Supply output feedback signal ground；PRM is output (the as Switching Power Supply modulation of impulse response modulation
The pulse signal of circuit final output, can directly drive switch element), other each components and parts symbols are electronic circuit technology field
General symbol(s), concrete annexation are refer to shown in accompanying drawing.
In the utility model embodiment, high level is only dependent upon R1C1, and low level is only dependent upon R2C2.
The a resistance additionally, diode between 2 and 3 pins can be connected again, reduces the rise time of output signal, but its
Resistance selection should ensure that pulse width is consistent with continuous impulse width first after resetting.
This utility model also provides a kind of Switching Power Supply, including：Switch electricity described in any one that this utility model is provided
Source modulation circuit.Due to the Switching Power Supply modulation electricity that the Switching Power Supply that this utility model is provided is provided using this utility model
Road, therefore, the embodiment that refer to above-mentioned Switching Power Supply modulation power source is understood that here is omitted, the Switching Power Supply
Conceived based on identical utility model with above-mentioned Switching Power Supply modulation circuit, with identical beneficial effect.
In description of the present utility model, a large amount of details are illustrated.It is to be appreciated, however, that reality of the present utility model
Apply example to put into practice in the case where there is no these details.In some instances, known method, knot are not been shown in detail
Structure and technology, so as not to obscure the understanding of this description.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy described with reference to the embodiment or example
Point is contained at least one embodiment of the present utility model or example.In this manual, the schematic table to above-mentioned term
State.And, the specific features of description, structure, material or feature can be with
Combined in any one or more embodiments or example in an appropriate manner.Additionally, in the case of not conflicting, this area
Technical staff the feature of the different embodiments or example described in this specification and different embodiment or example can be entered
Row is combined and is combined.
Finally it should be noted that：Various embodiments above is only in order to illustrating the technical solution of the utility model, rather than which is limited
System；Although being described in detail to this utility model with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：Which still can be modified to the technical scheme described in foregoing embodiments, or to which part or whole
Technical characteristic carries out equivalent；And these modifications or replacement, do not make the essence of appropriate technical solution depart from this practicality new
The scope of each embodiment technical scheme of type, which all should be covered in the middle of the scope of claim of the present utility model and description.
Claims (10)
1. a kind of Switching Power Supply modulation circuit, it is characterised in that include：Square wave generation circuit and asynchronous reset circuit；Wherein,
The asynchronous reset circuit is all connected with the output feedback end of side's wave generation circuit and Switching Power Supply, for according to institute
The voltage swing for stating the output feedback end of Switching Power Supply produces reset signal, and the reset signal is sent to the square wave
Raw circuit；
Side's wave generation circuit is used for receiving the reset signal, produces pulse signal and output according to the reset signal
The pulse signal.
2. Switching Power Supply modulation circuit according to claim 1, it is characterised in that side's wave generation circuit adopts multi resonant
Oscillating circuit is realized.
3. Switching Power Supply modulation circuit according to claim 2, it is characterised in that the multi-resonant oscillating circuit adopts 555
When base chip realize.
4. Switching Power Supply modulation circuit according to claim 3, it is characterised in that the asynchronous reset circuit is using described
When 555, base chip and audion are realized.
5. Switching Power Supply modulation circuit according to claim 4, it is characterised in that the base stage of the audion is opened with described
The output feedback end connection in powered-down source, the colelctor electrode of the audion are connected with the forced resetting pin of base chip when described 555,
The emitter stage of the audion is connected with the output pin of base chip when described 555.
6. Switching Power Supply modulation circuit according to claim 3, it is characterised in that the asynchronous reset circuit is using described
When 555, base chip and triode type photoelectrical coupler are realized.
7. Switching Power Supply modulation circuit according to claim 6, it is characterised in that the triode type photoelectrical coupler
Input anode is connected with the output feedback end of the Switching Power Supply, and the input negative electrode of the triode type photoelectrical coupler connects
Output feedback signal ground, the forced resetting pin of the colelctor electrode of the triode type photoelectrical coupler and base chip when described 555
Connection, the emitter stage of the photoelectrical coupler are connected with the output pin of base chip when described 555.
8. Switching Power Supply modulation circuit according to claim 3, it is characterised in that base chip is to adopt TTL when described 555
Technique 555 when base chip.
9. Switching Power Supply modulation circuit according to claim 3, it is characterised in that base chip is employing when described 555
CMOS technology 555 when base chip.
10. a kind of Switching Power Supply, it is characterised in that include：Switching Power Supply described in claim 1 to any one of claim 9
Modulation circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620986762.8U CN206023567U (en) | 2016-08-30 | 2016-08-30 | Switching Power Supply modulation circuit and Switching Power Supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620986762.8U CN206023567U (en) | 2016-08-30 | 2016-08-30 | Switching Power Supply modulation circuit and Switching Power Supply |
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| Publication Number | Publication Date |
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| CN206023567U true CN206023567U (en) | 2017-03-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300927A (en) * | 2016-08-30 | 2017-01-04 | 宋宇敬 | Switching Power Supply modulation circuit and Switching Power Supply |
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- 2016-08-30 CN CN201620986762.8U patent/CN206023567U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300927A (en) * | 2016-08-30 | 2017-01-04 | 宋宇敬 | Switching Power Supply modulation circuit and Switching Power Supply |
| CN106300927B (en) * | 2016-08-30 | 2019-05-10 | 宋宇敬 | Switching Power Supply modulation circuit and Switching Power Supply |
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Granted publication date: 20170315 Termination date: 20170830 |