CN104022645B - The constant frequency of a kind of switch converters fixes turn-off time control device - Google Patents
The constant frequency of a kind of switch converters fixes turn-off time control device Download PDFInfo
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Abstract
The constant frequency that the invention discloses a kind of switch converters fixes turn-off time control device, including power circuit and control circuit, control circuit includes input and output voltage feedback regulation loop, this loop includes input voltage measurement device, output voltage detection device, subtraction circuit and divider, input is connected to input voltage measurement device, output is connected to output voltage detection device, input voltage measurement device and output voltage detection device are connected to subtraction circuit, input voltage measurement device and subtraction circuit are connected to divider, divider output and rest-set flip-flop output are connected to adjustable shutoff intervalometer, the output of adjustable shutoff intervalometer is connected to the input of rest-set flip-flop.The present invention the most still has higher efficiency, and when load is undergone mutation, controller can quickly respond, and makes Switching Power Supply recover rapidly stable state；The present invention can maintain the constant frequency duty of switch converters all the time, it is simple to the integrated and popularization of control system.
Description
Technical field
The present invention relates to use the Switching Power Supply controlled based on output voltage ripple, particularly to using the fixing turn-off time
The Switching Power Supply controlled and device thereof.
Background technology
Along with greatly developing of Power Electronic Technique, the application of Switching Power Supply is more and more extensive, miscellaneous electricity
Subset is more and more higher to the requirement of power supply.Switching Power Supply can meet the demand of various application scenario, with the choosing of control mode
Take closely related.Under the epoch that Power Electronic Technique is fast-developing, the control technology of switch DC-DC converter also achieves rich
Rich achievement.According to different application scenarios, switch converters can use different control modes, so that Switching Power Supply obtains
Optimal service behaviour.The output of switch converters controls to be to be come by the ON time of control circuit regulation device for power switching
Realize.According to the implementation of dutycycle, the control mode of switch converters mainly has fixed frequency control and variable frequency
Control.Fixed frequency controls namely traditional pulse width modulation (PWM) technology, and it is low that traditional PWM controls technology light-load efficiency,
Dynamic responding speed is slow.Although and variable frequency controls switch converters and has good transient response speed, also overcoming light
Carrying inefficient shortcoming, but the precision of voltage regulation is poor, variable switching frequency brings the biggest difficulty also to the design of wave filter.
Therefore, if the deficiency that can improve variable frequency control switch converters switching frequency variable will expand variable ratio frequency changer control greatly
The range of application of technology processed, is simultaneously also beneficial to the integrated of variable ratio frequency changer control chip and promotes.
Fixing turn-off time (Fixed off time, FOT) control method is a kind of frequency conversion, non-linear modulation method.Its
Operation principle is: when switch converters output voltage instantaneous value vo (t) arrives reference voltage Vref, and comparator output VS is high
Level burst pulse voltage, rest-set flip-flop Q end output VD be low level voltage, switching tube S turn off, vo begins to decline.The shutoff of S
Time is determined by turning off intervalometer, when, after fixing turn-off time TOFF, turning off intervalometer output VR is a high level burst pulse
Voltage, make rest-set flip-flop Q end VD be high level voltage, S transfers conducting state to, and vo rises.When vo rises to Vref, S is again
Turn off, enter the next on-off control cycle.Fixing turn-off time (Fixed off-time, FOT) control technology belongs to pulse
The one of frequency modulation(PFM) (PFM) technology.It is compared with PWM voltage mode control technology, and the precision of voltage regulation is slightly worse, but has faster wink
State response speed and higher light-load efficiency.The simple in construction of FOT controller, it is not necessary to loop compensation, in light load situation
Lower efficiency is high, good stability, therefore fixes turn-off time (FOT) control Technical comparing and is applicable to the driving of middle low power LED power
IC。
But, the currently used switch change-over device controlled based on the fixing turn-off time there is also following deficiency: FOT and controls
Technology belongs to the category of VFC, and the switching frequency of its change influences whether the loss of Switching Power Supply, and is unfavorable for switch electricity
The comprehensive Design of source electromagnetic interface filter, the noise frequency introduced by Switching Power Supply in addition also can change therewith, if not being controlled by,
The serious switching frequency that results even in enters audiorange.Thus greatly limit the integrated of FOT control circuit
With popularization.
Summary of the invention
It is an object of the invention to, by adding input and output voltage Feedback adjusting loop in FOT control method, solve out
Close the problem that power supply operating frequency changes with input and output voltage.
The present invention for solving its technical method is:
The constant frequency of a kind of switch converters fixes turn-off time control device, including power circuit and control circuit, described
Power circuit includes that input, switching device, filter and output, input are connected to switching device, passes after switching device
Being passed to filter, enter output after filtering after the effect of device, described control circuit includes that output voltage detects device, base
Quasi-voltage, comparator, rest-set flip-flop, adjustable shutoff intervalometer and drive circuit, output is connected to output voltage detection device, defeated
Go out voltage check device and reference voltage be all connected to comparator, after be transferred to rest-set flip-flop, then be connected to through overdrive circuit
Switching device.Described control circuit also includes input and output voltage feedback regulation loop, described input and output voltage feedback regulation
Loop includes input voltage measurement device, output voltage detection device, subtraction circuit and divider, and input is connected to input electricity
Pressure detection device, output is connected to output voltage detection device, input voltage measurement device and output voltage detection device and all connects
Being connected to subtraction circuit, be simultaneously entered voltage check device and subtraction circuit is connected to divider, divider output and RS trigger
Device output is connected to adjustable shutoff intervalometer, and the output of adjustable shutoff intervalometer is connected to the input of rest-set flip-flop.
As a further improvement on the present invention, described power circuit specifically includes switching tube S, diode D, electric capacity C, load
R, inductance L, the positive pole of input voltage connects with the drain electrode of switching tube S, negative pole and the anode of diode D, one end of electric capacity C and negative
The one end carrying R connects, with load one end output negative pole of being connected of R, the source electrode of switching tube S and the negative electrode of diode D and inductance L
One end connects, and the other end of inductance L connects with one end of electric capacity C and one end of load R, and the one end being connected with load R is just exporting
Pole.
As a further improvement on the present invention, described control circuit specifically includes comparator, rest-set flip-flop, adjustable pass are concluded
Time device, subtraction circuit, divider, described output cathode is connected with the anode of comparator, and the negative terminal of comparator connects reference voltage,
The outfan of comparator is connected with the S end of rest-set flip-flop, rest-set flip-flopThe grid by drive circuit with switching tube S is held to connect
Connecing, R end and Q end are all connected with adjustable shutoff intervalometer.
As a further improvement on the present invention, the input of described input voltage is connected to input voltage measurement device (5),
Described output cathode is connected to output voltage detection device (7), input voltage measurement device (5) and output voltage detection device
(7) it is connected to subtraction circuit (6), is simultaneously entered voltage check device (5) and subtraction circuit (6) is connected to divider (13),
Divider (13) output is connected to adjustable shutoff intervalometer (14).
Compared with prior art, the invention has the beneficial effects as follows:
One, compared with traditional PWM pulse modulation technology, use the Switching Power Supply of control method of the present invention in light load bar
Still having higher efficiency under part, when load is undergone mutation, controller can quickly respond, and makes Switching Power Supply recover rapidly
Stable state.
Two, fixing another benefit of turn-off time control method based on input and output voltage feedback regulation constant frequency is to begin
Maintain the constant frequency duty of switch converters eventually, it is simple to the integrated and popularization of control system.
Accompanying drawing explanation
The invention will be further described with detailed description of the invention below in conjunction with the accompanying drawings.
Fig. 1 is that the control system of the present invention realizes apparatus structure block diagram.
Fig. 2 is the electrical block diagram of the embodiment of the present invention.
Fig. 3 is the adjustable shutoff timer circuit structural representation of the embodiment of the present invention.
Fig. 4 is the lower output voltage ripple schematic diagram of different input and output voltages combination of the embodiment of the present invention.
Output voltage transient response time domain waveform when Fig. 5 is the switch converters input voltage mutation of the embodiment of the present invention
Figure.
Fig. 6 be the embodiment of the present invention switch converters load current sudden change time output voltage transient response time domain waveform
Figure.
In Fig. 4: (a) is the input voltage waveform of changer；The output voltage ripple of changer when () is for setting 5V output b
Waveform.The output voltage ripple waveform of changer when () is for setting 3.3V output c.
In Fig. 5: (a) is that changer output voltage adjusts waveform；B () is changer input voltage mutation time domain waveform.
In Fig. 6: (a) is changer load current sudden change waveform；B () is that changer output voltage adjusts waveform.
Detailed description of the invention
The invention will be further described with detailed description of the invention below in conjunction with the accompanying drawings.
The present invention controls the ultimate principle of technology according to FOT, is adding input and output voltage detection in turning off intervalometer
Feedback loop, by the input and output voltage of real-time sampling switch converters, turns off intervalometer and the most dynamically adjusts, maintain switch
Frequency-invariant.The concrete technical scheme used is: when switch converters input and output voltage has any one parameter change,
Input and output voltage feedback control loop will detect that corresponding change, and feedback voltage V FB sends controller, controlled electricity to the most at last
Corresponding change, controller change fixing turn-off time, thus maintained switch is there is in stream source output electric current with input and output voltage
Frequency constant.And when load is undergone mutation, owing to CF-FOT controls not change FOT basic control principle, work former
Manage as controlling with FOT, there is quick transient response, the most too much narration equally.
Another object of the present invention is to improve voltage regulation factor, facilitates the integrated popularization of control chip, due to the present invention
Middle constant frequency is fixed the switching frequency of turn-off time control and is only determined by several circuit parameters during converter design, no matter therefore what using
Planting input and output voltage, the filter circuit of its changer can be unified to be designed.Corresponding to CCM under same inventive concept
Turn-off time control switch converters device is fixed based on input and output voltage feedback regulation constant frequency under pattern.This device is defeated by this
Enter 1, switching device 2, filter 3, input and output voltage feedback regulation device 4 and control circuit part composition.Controlling ring
Lu Zhong, the outer shroud error amplifier of low bandwidth controls output voltage vo and is equal to reference voltage V ref, therefore based on input and output electricity
The constant frequency of pressure feedback regulation fixes turn-off time control method so that voltage regulation factor improves a lot；Avoid switch
The shortcoming that frequency changes with input and output voltage, can quickly regulate input voltage and load disturbance thereof the shadow to output voltage
Ring, thus there is excellent transient response characteristic.
In Fig. 1, be control circuit outside dotted line frame, including: output voltage detection device 9, reference voltage 11, comparator 10,
Rest-set flip-flop 12, adjustable shutoff intervalometer 14 and drive circuit 8.It is input and output voltage feedback regulation loop below dotted line frame,
Including: input voltage measurement 5, output voltage detection 7, subtraction circuit 6 and divider 13.Annexation: voltage check device 9
Be all connected to comparator 10 with reference voltage 11, after be transferred to rest-set flip-flop 12, then be connected to switching tube through overdrive circuit 11.
Be power circuit in dotted line frame, including inputting 1, switching device 2, filter 3, export 4.Annexation: input 1 is connected to out
Close device 2, after switching device 2, be transferred to filter 3, after the effect of device 3, enter output 4 after filtering.Dotted line frame
Lower section is input and output voltage feedback control loop, and annexation is: input voltage measurement device 5 and output voltage detection device 7 are all
Being connected to subtraction circuit 6, be simultaneously entered voltage check device 5 and subtraction circuit 6 is connected to divider 13, divider 13 output is even
It is connected to adjustable shutoff intervalometer 14.
Comparison diagram 2, Fig. 3 and Fig. 1, the corresponding relation between each device is respectively as follows: input voltage E correspondence input 1, S
(MOSFET) switching device 2 corresponding with diode D, inductance L, electric capacity C correspondence filter 3, load R correspondence output 4, benchmark electricity
Pressure VrefCorresponding reference voltage 11, comparator correspondence comparator 10, rest-set flip-flop correspondence rest-set flip-flop 12, drive circuit correspondence is driven
Galvanic electricity road 11.
Connection concrete in Fig. 2, Fig. 3 is: the positive pole of input voltage E connects with the drain electrode of switching tube S (MOSFET),
Negative pole connects with one end (output negative pole) of anode, one end of electric capacity C and the load R of diode D；Switching tube S's (MOSFET)
Source electrode connects with the negative electrode of diode D and one end of inductance L, the other end of inductance L and one end of electric capacity C and one end of load R
(output cathode) connects.Outfan is connected with the anode of comparator, and the negative terminal of comparator connects reference voltage, the output of comparator
End be connected with the S end of rest-set flip-flop, rest-set flip-flop Q end pass through drive circuit be connected with the grid of switching tube S (MOSFET), R end
All it is connected with adjustable shutoff intervalometer with Q end.
Being accomplished by of control method
Step 1: switching tube S turns on, output capacitance is charged, by the information of inductive current by power supply E by inductance L charging simultaneously
Feed back to output.
Step 2: output voltage compares with reference voltage, provides control signal to rear class rest-set flip-flop.
The step 3:RS trigger turn-off time is determined by turning off intervalometer, as fixing turn-off time TOFFAfter, turn off timing
Device output VRBe a high level burst pulse voltage, make rest-set flip-flop Q end VDFor high level voltage, S transfers conducting state, v tooOn
Rise.Work as voRise to VrefTime, S turns off again, enters the next on-off control cycle.
Fig. 4, Fig. 5, Fig. 6 show that fixing turn-off time control technology based on input and output voltage feedback regulation constant frequency exists
Application in Buck changer, corresponds respectively to different input and output voltage, input voltage mutation, the application of load current sudden change
Situation.
Concrete work process with principle is: switch converters output voltage instantaneous value voArrive reference voltage VrefTime, than
Relatively device output VSFor high level burst pulse voltage, rest-set flip-flop Q end output VDFor low level voltage, switching tube S turns off, voStart
Decline.The turn-off time of S is determined by turning off intervalometer, as fixing turn-off time TOFFAfter, turn off intervalometer output VRBe one high
Level burst pulse voltage, make rest-set flip-flop Q end VDFor high level voltage, S transfers conducting state, v tooRise.Work as voRise to Vref
Time, S turns off again, enters the next on-off control cycle.While normal work, input and output voltage Feedback adjusting loop
Detect input and output voltage in real time, in order to dynamically adjust the fixing turn-off time, it is ensured that switch converters constant frequency works.
Analysis of simulation result:
Fig. 4, Fig. 5, Fig. 6 are the result using PSIM software that the control method of the present invention carries out time-domain-simulation.In Fig. 4
Component (a), (b), the transverse axis of (c) are time ms, and the longitudinal axis is output voltage V.The transverse axis of Fig. 5, Fig. 6 is time ms, Fig. 5
A () longitudinal axis is output voltage ripple information, unit mV, and Fig. 5 (b) is input voltage transition waveform, unit V.Fig. 6 (a) longitudinal axis is
Load current information, unit A, Fig. 6 (b) is output voltage dynamic response waveform, unit V.As shown in Figure 4, based on input and output
Voltage Feedback regulation constant frequency fixes turn-off time (constant frequency fixed off time, CF-FOT) control
The Buck changer simulation waveform when input and output voltage changes.It can be seen that work as Vref=5 V, Vin =
During 10 V, TOFF = 5 μs、TON=5 μ s, when input voltage increases to 20V, CF-FOT controller is rapidly by TOFFIt is adjusted to
7.5 μ s, TONBeing adjusted to 2.5 μ s, switch periods keeps 10 μ s constant, i.e. switching frequency is maintained at 100 kHz.For input voltage
Sudden change, CF-FOT control Buck changer be showed only as output voltage ripple Δ voChange, its value increases in a leap to 36 from 25 mV
MV, adjust the time about in a switch periods, there is transient response speed faster.And work as Vref=3.3 V, Vin=10
During V, TOFF = 6.7μs、TON=3.3 μ s, and at VinUnder=20V, TOFFAnd TONIt is adjusted to 8.35 μ s and 1.65 μ s respectively,
Switch periods keeps constant, Δ voIncrease in a leap to 26 mV from 22 mV.Also be not difficult to find out from Fig. 5 and Fig. 6, at input voltage mutation and
During the sudden change of its load current, constant frequency is fixed the turn-off time and is controlled can adjust rapidly output voltage to steady statue, has good
Dynamic response performance.
The present invention in addition to can be used for controlling the power inverter in above-described embodiment it can also be used to Boost,
The Switching Power Supply of Buck-boost changer constant power circuit composition.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention.All essences in the present invention
Any amendment, equivalent and the improvement etc. made within god and principle, should be included within the scope of the present invention.
Claims (4)
1. the constant frequency of switch converters fixes a turn-off time control device, including power circuit and control circuit, described merit
Rate circuit includes inputting (1), switching device (2), filter (3) and output (4), and input (1) is connected to switching device (2),
After switching device (2), it is transferred to filter (3), after the effect of device (3), enters output (4), described control after filtering
Circuit processed includes the second output voltage detection device (9), reference voltage (11), comparator (10), rest-set flip-flop (12), adjustable pass
Disconnected intervalometer (14) and drive circuit (8), output (4) is connected to the second output voltage detection device (9), the second output voltage inspection
Survey device (9) and reference voltage (11) be all connected to comparator (10), after be transferred to rest-set flip-flop (12), then through overdrive circuit
(8) switching device (2) it is connected to；It is characterized in that: described control circuit also includes input and output voltage feedback regulation loop, institute
State input and output voltage feedback regulation loop to include input voltage measurement device (5), the first output voltage detection device (7), subtract
Method circuit (6) and divider (13), input (1) is connected to input voltage measurement device (5), and it is defeated that output (4) is connected to first
Go out voltage check device (7), the outfan of input voltage measurement device (5) and the output of the first output voltage detection device (7)
End is connected to the input of subtraction circuit (6), is simultaneously entered the outfan of voltage check device (5) and subtraction circuit (6)
Outfan is connected to that the input of divider (13), divider (13) outfan and rest-set flip-flop (12) outfan be connected to can
Adjusting the input turning off intervalometer (14), the outfan of adjustable shutoff intervalometer (14) is connected to the input of rest-set flip-flop (12)
End.
The constant frequency of switch converters the most according to claim 1 fixes turn-off time control device, it is characterised in that: described
Power circuit specifically includes switching tube S, diode D, electric capacity C, load R, inductance L, the positive pole of input voltage and the leakage of switching tube S
Pole connects, and negative pole connects with one end of anode, one end of electric capacity C and the load R of diode D, and this one end being connected with load R is
Cathode output end, the source electrode of switching tube S connects with the negative electrode of diode D and one end of inductance L, the other end of inductance L and electric capacity C
One end and the other end of load R connect, be cathode output end with this one end of being connected of load R.
The constant frequency of switch converters the most according to claim 2 fixes turn-off time control device, it is characterised in that: described
Cathode output end is connected with the anode of comparator, and the negative terminal of comparator connects reference voltage, and the outfan of comparator triggers with RS
The S end of device is connected, rest-set flip-flopEnd be connected by the grid of drive circuit with switching tube S, R end and Q end all with adjustable pass
Disconnected intervalometer connects.
The constant frequency of switch converters the most according to claim 3 fixes turn-off time control device, it is characterised in that: described
The input of input voltage is connected to input voltage measurement device (5), and described output cathode is connected to the first output voltage detection
Device (7).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102014218000A1 (en) * | 2014-09-09 | 2016-03-10 | BSH Hausgeräte GmbH | Switching device for switching a power supply for an electronic control unit, household appliance and method therefor |
| WO2020077553A1 (en) | 2018-10-17 | 2020-04-23 | Texas Instruments Incorporated | A voltage regulator with an adaptive off-time generator |
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