CN107786086A - Constant on-time control Buck converter multiple-pulses cluster hair improves device - Google Patents
Constant on-time control Buck converter multiple-pulses cluster hair improves device Download PDFInfo
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- CN107786086A CN107786086A CN201610762052.1A CN201610762052A CN107786086A CN 107786086 A CN107786086 A CN 107786086A CN 201610762052 A CN201610762052 A CN 201610762052A CN 107786086 A CN107786086 A CN 107786086A
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- circuit
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- electric capacity
- energy storage
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Classifications
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- 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
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
Abstract
The present invention relates to switch power technology field, more particularly to constant on-time control Buck converter multiple-pulses cluster hair improves device, including power circuit and COT controllers, power circuit includes input block, switching device, energy storage inductor, filter circuit and output unit, and COT controllers include output voltage detecting circuit, reference voltage circuit, comparison circuit, RS triggers circuits, conducting timer, drive circuit and RC feedback circuits.The current ripple signal of energy storage inductor is fed back to comparator by the present invention, the output voltage of constant on-time control Buck converter multiple-pulses cluster hair improvement device is set to follow the curent change of energy storage inductor, eliminate using impulse cluster existing for smaller output capacitance ESR find as, so that constant on-time control Buck converters are operated in stable state, solves the application limitation of current COT controls Buck converters.
Description
Technical field
The present invention relates to switch power technology field, more particularly to constant on-time control Buck converter multiple-pulse clusters
Hair improves device.
Background technology
With greatly developing for Power Electronic Technique, the application field of Switching Power Supply is more and more extensive, especially automobile electricity
Requirement more and more higher of the electronic equipment of subdomains to power supply.Traditional pulsewidth modulation (pulse width modulation,
PWM) control technology has the advantages that no steady-state error, switching frequency are fixed, and extensively should have been obtained in switching power converter
With.However, PWM controls usually require error amplifier and corresponding compensation network, and COMPENSATION NETWORK DESIGN is complicated.Constant conduction
Time (constant on-time, COT) control is a kind of based on output voltage ripple and without error amplifier and compensation net
The variable control technology of network, switching frequency.COT controls make the power switch pipe of switch converters be led within a regular time
It is logical, the regulation of control pulse duty factor is realized by controlling the turn-off time, to maintain the stabilization of output voltage.Buck is converted
Device, also referred to as decompression transducer, are the single tube not isolated DC converters that a kind of output voltage is less than input voltage, COT controls
It is generally used in Buck converters, has the advantages that simple in construction, light-load efficiency is high, rapid dynamic response speed.
However, following deficiency using the Buck convertor devices controlled based on constant on-time at present also be present：Using
Requirement of the Buck converters of COT controls to output capacitance is extremely strict, the type and capacitance of output capacitance, especially output electricity
Hold ESR has strong influence to the control performance of whole switch converters, at present using based on constant on-time control
Multiple-pulse cluster be present using low output capacitance ESR and find as unstable in Buck convertor devices.Wherein, output capacitance ESR refers to
The equivalent series resistance of electric capacity, it is the dead resistance having on any one electric capacity.Current constant on-time control
Buck converters need that there is larger output capacitance ESR to realize, some portable sets or mobile terminal, can not load volume compared with
Big electrochemical capacitor, the small volume of ceramic condenser, but the output capacitance ESR of ceramic condenser is very small, can almost ignore, on
Deficiency is stated to limit the integrated of COT control circuits and promote.
The content of the invention
The purpose of the present invention is the defects of overcoming prior art, there is provided one kind reduces constant on-time control Buck conversion
The improvement device that device is relied on output capacitance ESR.
Realizing the technical scheme of the object of the invention is：Constant on-time control Buck converter multiple-pulses cluster hair improves dress
Put, including power circuit and COT controllers, power circuit include input block, switching device, energy storage inductor, filter circuit and
Output unit, COT controllers include output voltage detecting circuit, reference voltage circuit, comparison circuit, RS triggers circuits, conducting
Timer, drive circuit and RC feedback circuits, input block are connected to energy storage inductor, the filtered electricity of energy storage inductor through switching device
Road is connected to output unit, and output unit is by the inverting input of output voltage detecting circuit connection comparison circuit, benchmark electricity
Volt circuit connects the in-phase input end of comparison circuit, the set input of the output end connection RS triggers circuits of comparison circuit, RS
The output end of triggers circuit turns on the defeated of timer by drive circuit connecting switch, the output end connection of RS triggers circuits
Enter end, turn on the RESET input of the output end connection RS triggers circuits of timer, RC feedback circuits are by the ripple on energy storage inductor
Line signal is coupled to the inverting input of comparison circuit.
As the prioritization scheme of the present invention, RC feedback circuits include resistance Rf, electric capacity CfWith electric capacity Cb, resistance RfOne end
Connect the input of energy storage inductor, resistance RfOther end connection electric capacity CfPositive pole, electric capacity CfNegative pole connection energy storage inductor
Output end, resistance RfOther end connection electric capacity CbPositive pole, electric capacity CbNegative pole connection voltage detecting circuit.
As the prioritization scheme of the present invention, electric capacity CbMeet：
Wherein：CbFor electric capacity CbCapacitance, VinThe input voltage value provided for input block, TONFor RS triggers circuits
ON time, VOFor the instantaneous voltage of output unit output, R1 and R2 are the instantaneous voltage for being connected in parallel on output unit output
The divider resistance at both ends.
As the prioritization scheme of the present invention, switching device is switching tube S, and switching tube S drain electrode is connected with input block, opened
The source electrode for closing pipe S is connected with the input of energy storage inductor.
As the prioritization scheme of the present invention, filter circuit includes electric capacity C and resistance r, and electric capacity C and resistance r are connected in series, electricity
Hold the output end of C positive pole connection energy storage inductor.
As the prioritization scheme of the present invention, comparison circuit is comparator.
As the prioritization scheme of the present invention, RS triggers circuits are rest-set flip-flop.
The present invention has positive effect：The current ripple signal of energy storage inductor is fed back to comparator by the present invention, makes perseverance
The output voltage for determining ON time control Buck converter multiple-pulses cluster hair improvement device follows the curent change of energy storage inductor, disappears
Except being found using impulse cluster existing for smaller output capacitance ESR as so that constant on-time control Buck converter work
In stable state, the stable operation intervals of output capacitance ESR are expanded, have reduced inductive current ripple, the present invention solves mesh
The application limitation of preceding COT controls Buck converters.
Brief description of the drawings
In order that present disclosure is easier to be clearly understood, it is right below according to specific embodiment and with reference to accompanying drawing
The present invention is described in further detail.
Fig. 1 is the theory diagram of the present invention；
Fig. 2 is the circuit theory diagrams of the present invention；
Fig. 3 is the current time domain beamformer exported using the Buck convertor devices controlled based on constant on-time；
Fig. 4 is the current voltage x current plane phase path using the Buck convertor devices controlled based on constant on-time
Analogous diagram；
Fig. 5 is the time domain beamformer that the present invention exports；
Fig. 6 is the voltage x current plane phase path analogous diagram of the present invention.
Wherein：1st, input block, 2, switching device, 3, energy storage inductor, 4, filter circuit, 5, output unit, 6, voltage inspection
Slowdown monitoring circuit, 7, reference voltage circuit, 8, comparison circuit, 9, RS triggers circuits, 10, conducting timer, 11, drive circuit, 12, RC
Feedback circuit.
Embodiment
As shown in figure 1, the invention discloses constant on-time control Buck converter multiple-pulses cluster hair to improve device, bag
Include power circuit and COT controllers, power circuit includes input block 1, switching device 2, energy storage inductor 3, filter circuit 4 and defeated
Go out unit 5, COT controllers include output voltage detecting circuit 6, reference voltage circuit 7, comparison circuit 8, RS triggers circuits 9, led
Logical timer 10, drive circuit 11 and RC feedback circuits 12, input block 1 are connected to energy storage inductor 3, energy storage through switching device 2
The filtered circuit 4 of inductance 3 is connected to output unit 5, and output unit 5 connects comparison circuit 8 by output voltage detecting circuit 6
Inverting input, reference voltage circuit 7 connect the in-phase input end of comparison circuit 8, the output end connection RS triggerings of comparison circuit 8
The set input of circuit 9, the output end of RS triggers circuits 9 pass through the connecting switch 2 of drive circuit 11, RS triggers circuits 9
Output end connection conducting timer 10 input, the reset of the output end connection RS triggers circuits 9 of conducting timer 10 is defeated
Enter end, the ripple signal on energy storage inductor 3 is coupled to the inverting input of comparison circuit 8 by RC feedback circuits 12.Wherein, drive
Circuit 11 is mainly used in driving switch device 2, and voltage detecting circuit is mainly for detection of constant on-time control Buck conversion
Device multiple-pulse cluster hair improves the output voltage of device.
As shown in Fig. 2 RC feedback circuits 12 include resistance Rf, electric capacity CfWith electric capacity Cb, resistance RfOne end connection energy storage electricity
The input of sense 3, resistance RfOther end connection electric capacity CfPositive pole, electric capacity CfNegative pole connection energy storage inductor 3 output end,
Resistance RfOther end connection electric capacity CbPositive pole, electric capacity CbNegative pole connection voltage detecting circuit 6.Switching device 2 is switching tube
S, switching tube S drain electrode are connected with input block 1, and switching tube S source electrode is connected with the input of energy storage inductor 3.Filter circuit 4
Including electric capacity C and resistance r, electric capacity C and resistance r are connected in series, the output end of electric capacity C positive pole connection energy storage inductor 3.Compare electric
Road 8 is comparator.RS triggers circuits 9 are rest-set flip-flop.Wherein, inductance L is energy storage inductor 3, VinThere is provided for input block 1 defeated
Enter magnitude of voltage, VOThe instantaneous value of the instantaneous voltage, i.e. Buck converters output voltage that are exported for output unit 5, VrefOn the basis of
The reference voltage value that potential circuit 7 provides.
It by angular frequency is ω that voltage and current during Buck converter steady operations, which is,s=2 π fsFundamental wave sinusoidal component and
The cycle ripple signal of its higher hamonic wave sinusoidal component synthesis, fsFor switching tube S switching frequency, generally, with fundamental wave just
String component is compared, and the amplitude very little of higher hamonic wave sinusoidal component, the influence to circuit branch impedance can be ignored.In order to true
Protecting RC feedback circuits 12 does not influence the voltage and inductive current at inductance L both ends, it is desirable to VB≈Vo, i.e. vCfIt is sufficiently small, meet：
τf=RfCf＞ ＞ TON
Wherein, τfIt is resistance RfWith electric capacity CbTime constant, in order to ensure inductive current iLPass through electric capacity CbAlmost all
Feedback circuit 12 is injected into, needs to meet：
Wherein
C can be drawn through abbreviationbConstraints be：
Wherein：CbFor electric capacity CbCapacitance, VinThe input voltage value provided for input block 1, TONFor RS triggers circuits 9
ON time, VOThe instantaneous voltage exported for output unit 5, R1 and R2 are the voltage wink for being connected in parallel on the output of output unit 5
The divider resistance at duration both ends.
As shown in Fig. 2 VinPositive pole connect with switching tube S drain electrode, VinNegative pole and diode D anode and load R
One end (output negative pole) connect；Switching tube S source electrode connects with diode D negative electrode and inductance L one end, inductance L's
The other end connects with electric capacity C one end and the load R other end (output cathode).The positive pole connection reference voltage of comparator,
The output end of comparator and the set input S-phase of rest-set flip-flop connect, rest-set flip-flop Q ends (output end) by drive circuit 11 with
Switching tube S grid connection, the R ends (input the RESET input) of rest-set flip-flop and Q ends are all connected with conducting timer 10.RC is anti-
Current ripple signal on inductance L is coupled to divider resistance end by current feed circuit 12, and the voltage formed on divider resistance, which is connected to, to be compared
The inverting input of device so that Buck converter output voltage instantaneous values VOFollow inductance L inductive current iLChange, works as Buck
Converter output voltage instantaneous value VOLess than reference voltage VrefWhen, comparator output high level, rest-set flip-flop set, switching tube S
Conducting, output voltage VORise, conducting timer 10 determines switching tube S ON time TON, switching tube S conductings TONAfter time,
Turn on timer 10 and export a burst pulse, reset rest-set flip-flop, switching tube S shut-offs, VODecline；Work as VODrop to VrefWhen,
Switching tube S is turned on again, into next switch periods Ts, the stable output voltage of such iterative cycles maintenance.
Fig. 3 and Fig. 4 is the current time domain waveform exported using the Buck convertor devices controlled based on constant on-time
And voltage x current plane phase path analogous diagram, wherein VSFor switching tube make-and-break signal waveform, ILFor inductive current waveform, Δ VoFor
Output voltage ripple waveform, as seen from the figure, as a result of ceramic condenser, output capacitance ESR is smaller, is unsatisfactory for constant lead
The condition of logical time control Buck converter steady operations, so as to the phenomenon of multiple-pulse cluster hair occur, when causing constant conduction
Between control Buck converters work unstability.
Fig. 5 and Fig. 6 is to improve device using constant on-time of the present invention control Buck converter multiple-pulses cluster hair to export
Time domain waveform and voltage x current plane phase path analogous diagram, due to utilizing ripple injection feedback technique (inductor
Current ripple injection feedback, ICRIF) inductance L ripple current signal is fed back by divider resistance
To the input of comparator, dependence of the constant on-time control Buck converters to output capacitance ESR is reduced, eliminates and adopts
Existing for low output capacitance ESR cluster find as.
Particular embodiments described above, the purpose of the present invention, technical scheme and beneficial effect are carried out further in detail
Describe in detail it is bright, should be understood that the foregoing is only the present invention specific embodiment, be not intended to limit the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements done etc., it should be included in the guarantor of the present invention
Within the scope of shield.
Claims (7)
1. constant on-time control Buck converter multiple-pulses cluster hair improves device, it is characterised in that：Including power circuit and
COT controllers, described power circuit include input block (1), switching device (2), energy storage inductor (3), filter circuit (4) and
Output unit (5), described COT controllers include output voltage detecting circuit (6), reference voltage circuit (7), comparison circuit
(8), RS triggers circuits (9), conducting timer (10), drive circuit (11) and RC feedback circuits (12), described input block
(1) energy storage inductor (3) being connected to through switching device (2), energy storage inductor (3) filtered circuit (4) is connected to output unit (5),
Output unit (5) is by the inverting input of output voltage detecting circuit (6) connection comparison circuit (8), reference voltage circuit (7)
The in-phase input end of comparison circuit (8) is connected, the output end of comparison circuit (8) connects the set input of RS triggers circuits (9),
The output end of RS triggers circuits (9) is connected by drive circuit (11) connecting switch (2), the output end of RS triggers circuits (9)
The input of conducting timer (10) is connect, the output end of conducting timer (10) connects the RESET input of RS triggers circuits (9),
Ripple signal on energy storage inductor (3) is coupled to the inverting input of comparison circuit (8) by RC feedback circuits (12).
2. constant on-time control Buck converter multiple-pulses cluster hair according to claim 1 improves device, its feature
It is：Described RC feedback circuits (12) include resistance Rf, electric capacity CfWith electric capacity Cb, resistance RfOne end connection energy storage inductor (3)
Input, resistance RfOther end connection electric capacity CfPositive pole, electric capacity CfNegative pole connection energy storage inductor (3) output end, electricity
Hinder RfOther end connection electric capacity CbPositive pole, electric capacity CbNegative pole connection voltage detecting circuit (6).
3. constant on-time control Buck converter multiple-pulses cluster hair according to claim 1 improves device, its feature
It is：The electric capacity CbMeet：
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Wherein：CbFor electric capacity CbCapacitance, VinThe input voltage value provided for input block (1), TONFor RS triggers circuits (9)
ON time, VOFor the instantaneous voltage of output unit (5) output, R1 and R2 are the electricity for being connected in parallel on output unit (5) output
Press the divider resistance at instantaneous value both ends.
4. constant on-time control Buck converter multiple-pulses cluster hair according to claim 3 improves device, its feature
It is：Described switching device (2) is switching tube S, and switching tube S drain electrode is connected with input block (1), switching tube S source electrode
It is connected with the input of energy storage inductor (3).
5. constant on-time control Buck converter multiple-pulses cluster hair according to claim 4 improves device, its feature
It is：Described filter circuit (4) includes electric capacity C and resistance r, and described electric capacity C and resistance r are connected in series, electric capacity C positive pole
Connect the output end of energy storage inductor (3).
6. constant on-time control Buck converter multiple-pulses cluster hair according to claim 5 improves device, its feature
It is：Described comparison circuit (8) is comparator.
7. constant on-time control Buck converter multiple-pulses cluster hair according to claim 6 improves device, its feature
It is：Described RS triggers circuits (9) are rest-set flip-flop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610762052.1A CN107786086A (en) | 2016-08-28 | 2016-08-28 | Constant on-time control Buck converter multiple-pulses cluster hair improves device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610762052.1A CN107786086A (en) | 2016-08-28 | 2016-08-28 | Constant on-time control Buck converter multiple-pulses cluster hair improves device |
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| Publication Number | Publication Date |
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| CN107786086A true CN107786086A (en) | 2018-03-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610762052.1A Pending CN107786086A (en) | 2016-08-28 | 2016-08-28 | Constant on-time control Buck converter multiple-pulses cluster hair improves device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109856521A (en) * | 2018-12-27 | 2019-06-07 | 北京京能新能源有限公司 | Device test system and method |
| CN112383223A (en) * | 2020-10-19 | 2021-02-19 | 国网天津市电力公司 | Device for optimizing on-time control by applying simulation time and control method thereof |
| CN114337267A (en) * | 2021-12-28 | 2022-04-12 | Oppo广东移动通信有限公司 | Voltage control circuit and method based on COT (chip on Board) architecture and power supply equipment |
-
2016
- 2016-08-28 CN CN201610762052.1A patent/CN107786086A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109856521A (en) * | 2018-12-27 | 2019-06-07 | 北京京能新能源有限公司 | Device test system and method |
| CN109856521B (en) * | 2018-12-27 | 2022-02-18 | 北京京能新能源有限公司 | Device testing system and method |
| CN112383223A (en) * | 2020-10-19 | 2021-02-19 | 国网天津市电力公司 | Device for optimizing on-time control by applying simulation time and control method thereof |
| CN114337267A (en) * | 2021-12-28 | 2022-04-12 | Oppo广东移动通信有限公司 | Voltage control circuit and method based on COT (chip on Board) architecture and power supply equipment |
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