CN103414342A - Fixed-frequency constant on-off time control method of dynamic voltage regulating switch converter - Google Patents
Fixed-frequency constant on-off time control method of dynamic voltage regulating switch converter Download PDFInfo
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Abstract
The invention discloses a fixed-frequency constant on-off time control method of a dynamic voltage regulating switch converter and a device thereof. According to an output voltage and an output voltage reference, a comparison signal is generated, and is combined with a timing signal generated by an on-off timer so as to control an RS trigger; the RS trigger produces a control signal to control a switch converter; the arranged on-off timer is controlled by an input voltage and the output reference voltage, so that on-off time of the on-off timer automatically changes with the input voltage and the output reference voltage; and a switch frequency maintains constant. According to the invention, the advantages of fast transient response speed and good stability, and the advantage that the switch frequency does not change with the input voltage, the output reference voltage, and the load current are realized.
Description
Technical field
The present invention relates to switch power supply equipment, especially dynamic electric voltage by-pass cock converter determines the constant make-and-break time control technology of frequency and implement device thereof.
Background technology
Along with the high speed development of power electronic technology, power electronic equipment and people's work, the relation of life are day by day close, and electronic equipment all be unable to do without reliable power supply.Volume is little, efficiency is high and lightweight advantage owing to having for Switching Power Supply, in a plurality of fields, replaced linear power supply, switch power technology has become the most active branch of field of power electronics, and has caused power technology researcher's great attention.Along with the development that science and technology is maked rapid progress, from strength to strength, its demand to power supply is also more and more higher for the function of electronic product.Under the prerequisite that guarantees electronic product performance and function, in order to reduce the power consumption of electronic product, need to be according to its operating voltage of operation mode dynamic adjustments of electronic product.
Switching Power Supply mainly is comprised of switch converters and control device two parts.Converter is called again power circuit, has mainly comprised the switching device of on-off action, device for transformer and current rectifying and wave filtering circuit.Common power inverter topological structure has Buck converter, Boost converter, Buck-Boost converter, forward converter, anti exciting converter etc.Controller can input or output the variation of voltage by the detection power converter, and produces accordingly the operating state of respective switch signal controlling power inverter switching device, passes to the output of the energy of load with the stable switch converter thereby regulate.The structure of controller and operation principle are determined by the control method that switch converters adopts.For a certain converter topology, adopt different control methods to exert an influence to aspects such as systematic steady state precision and dynamic properties, so seeming, control method becomes more and more important.
Tradition pulse width modulation (PWM) technology is a kind of common switch converters control method, its thought is: with error amplifier, output voltage and the reference voltage of switch converters compared to rear acquisition error amplification signal, with the sawtooth signal of fixed frequency, compare acquisition pulse width modulation signal again, through conducting, the shutoff of overdrive circuit power ratio control contactor pipe, thereby adjust output voltage.The advantage of this control is that frequency is constant, is convenient to the design of output filter; But work as input voltage fluctuation, or the load current sudden change, or the reference voltage sudden change, existence due to error amplifier, error signal variations is relatively slow, thereby the variation of pulse duration is also comparatively slow, and this makes the transient response speed of switch converters slower.
Traditional pulse frequency modulated (PFM) technology is another common switch converters modulator approach, comprise that constant on-time (COT) is controlled and the constant turn-off time (CFT) is controlled, by changing pulse frequency, change the driving signal, conducting, the shutoff of power ratio control contactor pipe, thus output voltage adjusted.The advantage of this control is there is no error amplifier, and its transient response speed is relatively very fast; But this when being controlled at input voltage, output reference voltage and changing, larger variation can occur in switching frequency, thereby is difficult to the design output filter.
Summary of the invention
The control technology that the purpose of this invention is to provide a kind of dynamic electric voltage by-pass cock converter---fixed frequently constant make-and-break time is controlled.The advantage of the comprehensive PWM of this control technology and PFM control method, while adopting this control technology, switching frequency is constant, does not need error amplifier and compensating network thereof, and transient response speed is fast.
The present invention is for solving its technical problem, and the technical scheme adopted is:
Dynamic electric voltage by-pass cock converter determine the constant make-and-break time control method of frequency, the on-off timing device produces timing signal according to input voltage and output reference voltage, with the comparison signal acting in conjunction relatively produced by output voltage and output reference voltage in rest-set flip-flop, produce and drive signal, the power switch pipe of control switch converter, the output voltage of by-pass cock converter.
The inventive method compared with prior art, the invention has the beneficial effects as follows:
One, with traditional electrical die mould PWM, control and compare, controller does not have error amplifier and compensating network thereof, and control loop design is simple, and during the output reference voltage sudden change, the present invention has transient response speed quickly.
Two, with traditional electrical die mould PWM, control and compare, when input voltage, load current sudden change, the present invention has transient response speed quickly, less voltage overshoot and the less voltage amount of falling and better steady-state behaviour.
Three, with traditional electrical die mould COT, control and to compare, when output reference voltage reduced, the present invention had less output voltage ripple and faster transient response speed, and switching frequency and output reference voltage have nothing to do.
Four, with traditional electrical die mould COT, control and compare, when input voltage increased, the present invention had less output voltage ripple, and switching frequency is not subjected to the impact of input voltage fluctuation.
Another object of the present invention is to provide a kind of dynamic electric voltage by-pass cock converter device of the constant make-and-break time control technology of frequency surely of realizing.Its concrete structure adopts:
The device of fixed constant make-and-break time control technology frequently is by input voltage checkout gear, output voltage checkout gear, output reference voltage checkout gear, comparator, trigger, on-off timing device, and drive circuit forms; Wherein: output voltage checkout gear, comparator, input of rest-set flip-flop are linked in sequence; Input voltage checkout gear output, output reference voltage checkout gear output and output of rest-set flip-flop are connected with on-off timing device input, and on-off timing device output is connected with another input of rest-set flip-flop; Another output of rest-set flip-flop and drive circuit are linked in sequence.
In reality is implemented, adopt method of the present invention, according to the difference setting to the on-off timing device, can select constant on-time pattern (scheme 1) and constant turn-off time pattern (scheme 2), its corresponding input signal is the respective combination of input voltage and output reference voltage, when main circuit was the Buck converter, constant on-time pattern and the corresponding circuit structure diagram of constant turn-off time pattern were respectively Fig. 2 and Figure 10, contrasting this two figure can see: on-off timing device internal circuit configuration is basically identical, and difference is the input signal of on-off timing device; The signal that constant on-time shown in Figure 2 is controlled the current controlled source input of Buck converter is input voltage, and the signal of voltage controlled source input is output reference voltage; The signal that the constant turn-off time shown in Figure 10 is controlled the current controlled source input of Buck converter is input voltage, and the signal of voltage controlled source input is the poor of input voltage and output voltage.
Fig. 1 is control system implement device structured flowchart of the present invention.
Fig. 2 is that the embodiment of the present invention one adopts technical scheme electrical block diagram 1..
Fig. 3 is the embodiment of the present invention one output steady state voltage simulation waveform figure.
Fig. 4 is that the embodiment of the present invention one and traditional electrical die mould COT control the Buck converter transient response simulation waveform figure when input voltage fluctuation with identical main circuit parameter.
Fig. 5 is that the embodiment of the present invention one and traditional electrical die mould PWM control the Buck converter transient response simulation waveform figure when input voltage fluctuation with identical main circuit parameter.
Fig. 6 is that the embodiment of the present invention one and traditional electrical die mould COT control the Buck converter transient response simulation waveform figure when output reference voltage suddenlys change with identical main circuit parameter.
Fig. 7 is that the embodiment of the present invention one and traditional electrical die mould PWM control the Buck converter transient response simulation waveform figure when output reference voltage suddenlys change with identical main circuit parameter.
Fig. 8 is for being Buck converter transient response simulation waveform figure when load current suddenlys change that the embodiment of the present invention one and traditional electrical die mould COT control have identical main circuit parameter.
Fig. 9 is for being Buck converter transient response simulation waveform figure when load current suddenlys change that the embodiment of the present invention one and traditional electrical die mould PWM control have identical main circuit parameter.
Figure 10 is that control system embodiment mono-of the present invention adopts technical scheme electrical block diagram 2..
Figure 11 is that the embodiment of the present invention two adopts technical scheme electrical block diagram 1..
In Fig. 3: (a) be the converter output voltage waveforms; (b) drive signal waveform of exporting for controller.
In Fig. 4: (a) be output reference voltage; (b) be that dynamic electric voltage of the present invention is regulated the output voltage waveforms of Buck converter when output reference voltage suddenlys change; (c) be that traditional electrical die mould COT controls the output voltage waveforms of dynamic electric voltage adjusting Buck converter when output reference voltage suddenlys change.
In Fig. 5: (d) be output reference voltage; (e) be that dynamic electric voltage of the present invention is regulated the output voltage waveforms of Buck converter when output reference voltage suddenlys change; (f) be that traditional electrical die mould PWM controls the output voltage waveforms of dynamic electric voltage adjusting Buck converter when output reference voltage suddenlys change.
In Fig. 6: be (a) that input voltage (b) is the output voltage waveforms of dynamic electric voltage by-pass cock converter of the present invention when input voltage mutation; (c) be that traditional electrical die mould COT controls the output voltage waveforms of dynamic electric voltage by-pass cock converter when input voltage mutation.
In Fig. 7: (d) be input voltage waveform; (e) be the output voltage waveforms of dynamic electric voltage by-pass cock converter of the present invention when input voltage mutation; (f) be that traditional electrical die mould PWM controls the output voltage waveforms of dynamic electric voltage adjusting Buck converter when input voltage mutation.
In Fig. 8: (a) be load current; (b) be the output voltage waveforms of dynamic electric voltage by-pass cock converter of the present invention when load current suddenlys change; (c) be that traditional electrical die mould COT controls the output voltage waveforms of dynamic electric voltage by-pass cock converter when load current suddenlys change.
In Fig. 9: (d) be load current; (e) be the output voltage waveforms of dynamic electric voltage by-pass cock converter of the present invention when load current suddenlys change; (f) be that traditional electrical die mould PWM controls the output voltage waveforms of dynamic electric voltage adjusting Buck converter when load current suddenlys change.
Embodiment
Below by concrete example, also by reference to the accompanying drawings the present invention is done to further detailed description.
Embodiment mono-,
Fig. 1 illustrates, the specific embodiment of the present invention is: dynamic electric voltage by-pass cock converter is the constant make-and-break time control device of frequency surely, dynamic electric voltage by-pass cock converter is the device of the constant make-and-break time control technology of frequency surely, its controller is mainly by input voltage checkout gear, output voltage checkout gear, output reference voltage checkout gear, comparator, trigger, on-off timing device, and drive circuit forms.Output voltage installs afterwards after testing and reference voltage relatively produces comparison signal; Input voltage and output reference voltage after testing after, with the rest-set flip-flop acting in conjunction, in the on-off timing device, produce timing signal; Comparison signal and timing signal acting in conjunction are in rest-set flip-flop, and the output of rest-set flip-flop acts on the switching device of control change device after output driving circuit, obtain thus the regulated output voltage of expecting value.
1. technical scheme adopts the constant on-time pattern:
Fig. 2 has provided dynamic electric voltage and has regulated the Buck converter circuit structure diagram of frequency constant on-time control device surely.
The course of work that it is concrete and principle are: when output voltage is down to output reference voltage, rest-set flip-flop set, the conducting of master power switch pipe, in the on-off timing device, switching tube disconnects, timing capacitor terminal voltage linear rising of starting from scratch, when rising to the timer threshold voltage, rest-set flip-flop resets, and power switch pipe turn-offs, and output voltage descends, timer switch pipe closure, timer capacitance voltage reduce to zero; When output voltage drops to output reference voltage, enter next switch periods.
Analysis of simulation result:
Fig. 3 is for adopting PSIM software control method of the present invention to be carried out to the result of emulation, and the transverse axis of Fig. 3 component (a) and (b) is the time (ms), and the longitudinal axis (a) is for driving signal amplitude (V), and the longitudinal axis (b) is stable state output voltage (V).As can be seen from Figure 3, switch periods is 10 μ s, output voltage Wen Bowei 0.065V.Simulated conditions: input voltage vin=3V, output voltage V o=Vref=1V, inductance L=10 μ H, capacitor C=60 μ F, capacitor equivalent series resistance ESR=100m Ω, load R=0.5 Ω, frequency f=100kHz.
Fig. 4 is the present invention and adopts traditional electrical die mould COT control Buck converter the output voltage Dynamic Response Simulation oscillogram in the sudden change situation to occur at output reference voltage, the component (a) and (b) are with (c) corresponding output reference voltage, output voltage of the present invention and traditional electrical die mould COT control output voltage respectively, transverse axis is the time (ms), is reference and output voltage (V) in length and breadth.In Fig. 4, when 5ms output reference voltage by the 1V step, be changed to 0.25V and when the 5.2ms output reference voltage by the 0.25V step, be changed to 1V, it is the same fast that transient response speed of the present invention and traditional electrical die mould COT control transient response speed; But the present invention is before and after output reference voltage changes, and switching frequency remains unchanged, and traditional electrical die mould COT control switch frequency change is obvious, and output reference voltage is while reducing, and output voltage ripple of the present invention is less.
Fig. 5 is the present invention and adopts traditional electrical die mould PWM control Buck converter the output voltage Dynamic Response Simulation oscillogram in the sudden change situation to occur at output reference voltage, component (d), (e) and (f) corresponding output reference voltage, output voltage of the present invention, traditional electrical die mould PWM control output voltage respectively, transverse axis is the time (ms), is reference and output voltage (V) in length and breadth.In Fig. 5, when 12ms output reference voltage by the 1V step, be changed to 0.25V and when the 14ms output reference voltage by the 0.25V step, be changed to 1V, response speed of the present invention is more faster than the transient response speed that traditional electrical die mould PWM controls.
Fig. 6 is the present invention and adopts traditional electrical die mould COT to control the Buck converter at the input voltage emersion wave output voltage transient response simulation waveform figure under condition emotionally, the component (a) and (b) are with (c) corresponding input voltage fluctuation, output voltage of the present invention and traditional electrical die mould COT control output voltage respectively, transverse axis is the time (ms), is reference and output voltage (V) in length and breadth.In Fig. 6, when 3ms input voltage 3V step be changed to 8V and when 3.15ms input voltage by the 8V step, be changed to 3V, it is faster that transient response speed of the present invention is controlled transient response speed than traditional electrical die mould COT; When input voltage increased, output voltage ripple of the present invention was controlled little than traditional electrical die mould COT; No matter how input voltage changes, and switching frequency of the present invention remains unchanged, and the switching frequency that traditional electrical die mould COT controls changes.Visible employing switching frequency of the present invention and input voltage are also irrelevant.
Fig. 7 is the present invention and adopts traditional electrical die mould PWM to control the Buck converter at the input voltage emersion wave output voltage transient response simulation waveform figure under condition emotionally, component (d), (e) and (f) corresponding input voltage fluctuation, output voltage of the present invention and traditional electrical die mould PWM control output voltage respectively, transverse axis is the time (ms), is reference and output voltage (V) in length and breadth.In Fig. 7, when 21ms input voltage 3V step be changed to 8V and when 26ms input voltage by the 8V step, be changed to 3V, transient response speed of the present invention is more a lot of soon than the transient response speed that traditional electrical die mould PWM controls, output voltage has less voltage overshoot and the less voltage amount of falling, and stability is better.
Fig. 8 is the present invention and adopts traditional electrical die mould COT control Buck converter the output voltage Dynamic Response Simulation oscillogram in the sudden change situation to occur at load current, component (a) and (b) and (c) respectively corresponding load current sudden change, output voltage of the present invention and traditional electrical die mould COT control output voltage, transverse axis is the time (ms), is reference and output voltage (V) in length and breadth.In Fig. 8, when 7ms load by the 0.5A step, be changed to 2.5A and when the 7.1ms load by the 2.5A step, be changed to 0.5A, illustrate that the present invention has traditional electrical die mould COT and controls transient response speed fast.
Fig. 9 is the present invention and adopts traditional electrical die mould PWM control Buck converter the output voltage Dynamic Response Simulation oscillogram in the sudden change situation to occur at load current, component (d), (e) and (f) respectively corresponding load current sudden change, output voltage of the present invention and traditional electrical die mould PWM control output voltage, transverse axis is the time (ms), is reference and output voltage (V) in length and breadth.In Fig. 9, when 7ms load by the 0.5A step, be changed to 2.5A and when the 7.1ms load by the 2.5A step, be changed to 0.5A, with traditional electrical die mould PWM, control and compare, the present invention has extraordinary dynamic response characteristic, less voltage overshoot and the less voltage amount of falling.
2. technical scheme adopts constant turn-off time pattern:
Figure 10 has provided the present invention of dynamic electric voltage adjusting Buck converter and has adopted technical scheme circuit structure diagram 2..The course of work that it is concrete and principle are: when output voltage rises to output reference voltage, rest-set flip-flop resets, and the master power switch pipe turn-offs, and output voltage descends, turn-offing switching tube in timer disconnects, timing capacitor terminal voltage linear rising of starting from scratch, when rising to the timer threshold voltage, rest-set flip-flop set, the power switch pipe conducting, output voltage rises, timer switch pipe closure, and the timer capacitance voltage reduces to zero; When output voltage rises to output reference voltage, enter next switch periods.
Embodiment bis-
Figure 11 illustrates, this example is compared with embodiment mono-, power inverter is the Boost converter, adopt 1. constant on-time pattern of technical scheme, control device and embodiment mono-are roughly the same,, now the controlled current source input signal of on-off timing device is output reference voltage, the controlled voltage source input signal is the poor of output reference voltage and input voltage.By emulation, prove equally, adopt output voltage stabilization of the present invention, rapid dynamic response speed, switching frequency is constant.
The present invention, also can be for the Switching Power Supply of Buck-Boost converter constant power the electric circuit constitute except can be used for controlling Buck converter in above-described embodiment, Boost converter.
Claims (2)
1. dynamic electric voltage by-pass cock converter determines the constant make-and-break time control method of frequency, it is characterized in that, the on-off timing device produces timing signal according to input voltage and output reference voltage, with the comparison signal acting in conjunction relatively produced by output voltage and output reference voltage in rest-set flip-flop, produce and drive signal, the power switch pipe of control switch converter, the output voltage of by-pass cock converter.
2. realize the device of determining the constant make-and-break time control method of frequency of dynamic electric voltage by-pass cock converter claimed in claim 1, by input voltage checkout gear, output voltage checkout gear, output reference voltage checkout gear, comparator, trigger, on-off timing device, and drive circuit forms; It is characterized in that, output voltage checkout gear, comparator, input of rest-set flip-flop are linked in sequence; Input voltage checkout gear output, output reference voltage checkout gear output and output of rest-set flip-flop are connected with on-off timing device input, and on-off timing device output is connected with another input of rest-set flip-flop; Another output of rest-set flip-flop and drive circuit are linked in sequence.
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Cited By (8)
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| CN104022645A (en) * | 2014-06-12 | 2014-09-03 | 常州大学 | Constant-frequency fixed turning-off time control device of switching converter |
| CN104052266A (en) * | 2014-06-15 | 2014-09-17 | 西南交通大学 | Capacitance current type constant connecting time control technology and device thereof |
| US9374001B1 (en) | 2015-02-03 | 2016-06-21 | General Electric Company | Improving load transient response by adjusting reference current in isolated power converters |
| CN105720807A (en) * | 2014-12-03 | 2016-06-29 | 万国半导体(开曼)股份有限公司 | Method and apparatus for detecting input voltage and discharging retention voltage |
| CN108880237A (en) * | 2018-07-12 | 2018-11-23 | 矽力杰半导体技术(杭州)有限公司 | The switch time generation circuit and switch time control method of switch converters |
| CN110445396A (en) * | 2019-08-15 | 2019-11-12 | 晶艺半导体有限公司 | Switch power supply system and control method with active false load |
| CN111245233A (en) * | 2020-02-20 | 2020-06-05 | 重庆邮电大学 | Self-adaptive turn-off time generation circuit for buck switching power supply |
| CN111769738A (en) * | 2019-04-02 | 2020-10-13 | 中国电力科学研究院有限公司 | Direct current chopper circuit control system, method and device |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104022645A (en) * | 2014-06-12 | 2014-09-03 | 常州大学 | Constant-frequency fixed turning-off time control device of switching converter |
| CN104022645B (en) * | 2014-06-12 | 2016-08-17 | 常州大学 | The constant frequency of a kind of switch converters fixes turn-off time control device |
| CN104052266A (en) * | 2014-06-15 | 2014-09-17 | 西南交通大学 | Capacitance current type constant connecting time control technology and device thereof |
| CN105720807A (en) * | 2014-12-03 | 2016-06-29 | 万国半导体(开曼)股份有限公司 | Method and apparatus for detecting input voltage and discharging retention voltage |
| CN105720807B (en) * | 2014-12-03 | 2018-05-29 | 万国半导体(开曼)股份有限公司 | It is detained the method and device of voltage for detecting input voltage and releasing |
| US9374001B1 (en) | 2015-02-03 | 2016-06-21 | General Electric Company | Improving load transient response by adjusting reference current in isolated power converters |
| CN108880237A (en) * | 2018-07-12 | 2018-11-23 | 矽力杰半导体技术(杭州)有限公司 | The switch time generation circuit and switch time control method of switch converters |
| CN111769738A (en) * | 2019-04-02 | 2020-10-13 | 中国电力科学研究院有限公司 | Direct current chopper circuit control system, method and device |
| CN111769738B (en) * | 2019-04-02 | 2022-04-29 | 中国电力科学研究院有限公司 | Direct current chopper circuit control system, method and device |
| CN110445396A (en) * | 2019-08-15 | 2019-11-12 | 晶艺半导体有限公司 | Switch power supply system and control method with active false load |
| CN111245233A (en) * | 2020-02-20 | 2020-06-05 | 重庆邮电大学 | Self-adaptive turn-off time generation circuit for buck switching power supply |
| CN111245233B (en) * | 2020-02-20 | 2023-07-21 | 重庆邮电大学 | Self-adaptive turn-off time generation circuit for buck switching power supply |
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Application publication date: 20131127 |