CN101557167A - Bifrequency control method of switch power supply and device thereof - Google Patents
Bifrequency control method of switch power supply and device thereof Download PDFInfo
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- CN101557167A CN101557167A CNA2009100584187A CN200910058418A CN101557167A CN 101557167 A CN101557167 A CN 101557167A CN A2009100584187 A CNA2009100584187 A CN A2009100584187A CN 200910058418 A CN200910058418 A CN 200910058418A CN 101557167 A CN101557167 A CN 101557167A
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Abstract
The invention discloses a bifrequency control method of switch power supply and a device thereof. A controller combines two groups of pulses with different frequencies to realize control of a switch convertor according to output state of the switch convertor. The invention is applicable to controlling of switch convertors of various topological structures and has the advantages that the control loop is simple and reliable, free of network compensation, fast speed in transient response and low noise in electromagnetic interference (EMI).
Description
Technical field
The present invention relates to the Bifrequency control method and the device thereof of Switching Power Supply.
Background technology
Along with the high speed development of power electronic technology, the relation of power electronic equipment and people's work, life is close day by day, and electronic equipment all be unable to do without reliable power supply.Because Switching Power Supply has the advantage of aspects such as efficient height, volume are little with respect to the conventional linear stabilized voltage power supply, make switch power technology become gradually that people use and the focus of research.The develop rapidly of power electronic device provides a very big development space to Switching Power Supply especially, makes it little towards volume, and is in light weight, the efficient height, and power density is big etc., and direction develops, and causes insider's extensive concern, has a extensive future.The eighties, the computer power supply round Realization Switching Power Supplyization, the power supply that takes the lead in finishing computer is regenerated.The nineties, various electronics, electric equipment field, stored-program control exchange, communication, electron detection device, control appliance etc. all use Switching Power Supply as its power supply widely, have more promoted developing rapidly of switch power technology.Switching Power Supply mainly is made of power inverter and controller two parts.Power inverter is called power circuit again, mainly comprises switching device, device for transformer and current rectifying and wave filtering circuit.Common power inverter topological structure has Buck converter (buck converter), Boost converter (booster converter), Buck-Boost converter (buck-boost converter), forward converter, anti exciting converter etc.Controller can input or output the variation of voltage by the detection power translation circuit, and produces the operating state of respective switch signal controlling power conversion circuit switching device in view of the above, exports with the stable switch power supply thereby regulate the energy that passes to load.The structure of controller and operation principle are determined by the control method that Switching Power Supply adopted.For same power circuit topology, adopt different control methods to exert an influence, thereby the research of control method seem and become more and more important to aspects such as the stable state accuracy of system and dynamic properties.At present, a lot of application scenarios need Switching Power Supply to have good transient response speed, and adopt traditional pulse width modulation (PWM) technology to be difficult to satisfy this requirement; In addition, high frequencyization is the important development trend of Switching Power Supply, and this makes Switching Power Supply miniaturization more, but has also brought comparatively serious electromagnetic interference problem simultaneously, and this is with regard to the appearance of the new control method of exigence.
Traditional voltage-type pulse width modulating technology is the most common a kind of Switching Power Supply modulator approach.Its control thought is: with error amplifier the output voltage and the reference voltage of Switching Power Supply compared the acquisition error signal, by comparator this error signal and fixed frequency sawtooth signal are compared the acquisition pulse width signal again, conducting, shutoff with the control switch device make output voltage reach desired value.When fluctuation appearred in load, because the existence of compensating network, error signal variations was slow relatively, thereby the variation of pulse duration is also comparatively slow, and this makes that the dynamic responding speed of Switching Power Supply is slower.On the other hand, the improper meeting of COMPENSATION NETWORK DESIGN causes system's instability, and its design process is very loaded down with trivial details, thereby has limited the integrated of control circuit to a great extent and promoted.
Pulse frequency modulated (PFM) technology is that the Switching Power Supply modulator approach and the pulse width modulating technology of another common form is different, and it adjusts duty ratio by changing pulse frequency rather than pulse duration, thereby adjusts output voltage values.But this modulator approach is when input voltage or load change, and bigger fluctuation can take place operating frequency, thereby is difficult to the design electromagnetic interface filter.In some application scenario for the electromagnetic interference noise sensitive electronic devices, PFM (pulse width modulation) technology is with inapplicable.
Summary of the invention
The control method that the purpose of this invention is to provide a kind of Switching Power Supply makes it to overcome the above shortcoming of prior art.
The present invention for the method that solves its technology is: according to the output state of switch converters, controller adopts the different pulse of two class frequencys to make up, to realize the control to switch converters.The concrete technical scheme that is adopted has two,: 1. the output voltage values of any one pulse signal ends moment Switching Power Supply feeds back to voltage comparator, and compare: when the output voltage that samples is lower than reference voltage with reference voltage value, pulse selector selects high-frequency impulse as drive signal, and output voltage rises; On the contrary, when the output voltage that samples was higher than reference voltage, pulse selector adopted low-frequency pulse as drive signal, and output voltage descends, thereby realized the bifrequency control of Switching Power Supply.2. at the actuating switch pipe zero hour of any one pulse signal, inductive current rises, detect inductive current simultaneously, when inductive current rises to peak current, switching tube turn-offs, turn-off time, the turn-off time decision work at present pulse of switching tube was low frequency or high-frequency impulse, thereby realizes the bifrequency control of Switching Power Supply by the magnitude relationship decision when the prepulse output voltage zero hour and reference voltage.
Compared with prior art, the invention has the beneficial effects as follows:
One, compares with existing single constant frequency control, the present invention adopts the driving of two groups of constant frequencies (high frequency, low frequency) pulse signal as switching device, the switching signal frequency spectrum is expanded on two operating frequencies, and system produces littler electromagnetic interference noise, helps the design of electromagnetic interface filter;
Two, compare with existing pulse frequency modulated technology, Switching Power Supply of the present invention is when input voltage or load change, the driving of switching device is the combination of two groups of constant frequency pulses all the time, the frequency spectrum that is to say switching signal can not move on frequency axis along with the variation of input voltage or load, thereby has reduced electromagnetic interference noise Filter Design difficulty;
Three, with respect to existing traditional electrical die mould pulse width modulating technology, adopt Switching Power Supply of the present invention when load changing, controller can rapid adjustment high-frequency impulse and the shared ratio of low-frequency pulse, makes Switching Power Supply recover stable state rapidly;
Four, controller is directly compared with reference voltage with output voltage, need not compensating network, has simplified the control loop design, has strengthened the stability of a system, has improved transient response speed.
Another object of the present invention provides the device of the Bifrequency control method of realizing above-mentioned Switching Power Supply.Under same inventive concept, two kinds of concrete implement devices have been proposed corresponding to the Bifrequency control method of realizing Switching Power Supply.1. device is made up of voltage check device, comparator, impulse generator, pulse selector and drive circuit; Wherein: voltage check device, comparator, pulse selector and drive circuit are linked in sequence; The impulse generator that can produce two kinds of different frequency pulses is connected on the pulse selector.2. device is provided with the current ratio that is made of current sensing means and comparator and links to each other with the impulse generator that produces two kinds of different frequency pulses than branch road.Voltage check device detects output voltage, then by comparator control impuls cycle selector, current sensing means detects inductive current, by generating control impuls with pulse period selector acting in conjunction in impulse generator behind the comparator, last control impuls is by the work of drive circuit control main circuit again.
The invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is that control system of the present invention adopts technical scheme implement device structured flowchart 1..
Fig. 2 is the electrical block diagram of the embodiment of the invention one.
Fig. 3 is in the embodiment of the invention one, output voltage and drive signal corresponding relation schematic diagram.
Fig. 4 is in the embodiment of the invention one, the time-domain-simulation oscillogram of Switching Power Supply.
Fig. 5 is Switching Power Supply output voltage time-domain-simulation oscillogram when load changing of the embodiment of the invention one and traditional electrical die mould PWM modulation.
Fig. 6 is the drain electrode of Switching Power Supply power switch pipe and the voltage between source electrodes signal frequency domain simulation waveform figure of the embodiment of the invention one and traditional electrical die mould PWM modulation.
Fig. 7 is that control system of the present invention adopts technical scheme implement device structured flowchart 2..
Fig. 8 adopts technical scheme electrical block diagram 2. for the present invention.
Fig. 9 is a circuit groundwork waveform schematic diagram shown in Figure 8.
Figure 10 is the electrical block diagram of the embodiment of the invention two.
Among Fig. 4: (a) drive signal waveform of exporting for controller; (b) be the converter output voltage waveforms.
Among Fig. 5: (a) be the output voltage waveforms of Switching Power Supply when load changing of traditional electrical die mould PWM modulation; (b) be the output voltage waveforms of Switching Power Supply when load changing of the embodiment of the invention one.
Among Fig. 6: (a) be the leakage of Switching Power Supply power switch pipe, the voltage between source electrodes signal spectrum figure of traditional electrical die mould PWM modulation; (b) be the leakage of Switching Power Supply power switch pipe, the voltage between source electrodes signal spectrum figure of the embodiment of the invention one.
Embodiment
Embodiment one
Adopt technical scheme 1.:
Fig. 1 illustrates, and the specific embodiment of the present invention is: the Bifrequency control method of Switching Power Supply and device thereof, its controller mainly is made up of comparator, impulse generator, pulse selector and drive circuit.Output voltage installs the back after testing and compares with reference voltage, and comparator output is directly used in the work of control impuls selector; Impulse generator produces the pulse of two groups of different frequencies and selects for pulse selector; The output of pulse selector is used for the switching device of control change device behind drive circuit, obtain the regulated output voltage of expecting thus.
Fig. 2, Fig. 3 have provided the application in the Buck converter of bifrequency control technology under working in the discontinuous current pattern.Impulse generator produces two groups and has identical ON time but different pulse signal (the high frequency f of frequency
H, low frequency f
L).Under the discontinuous current pattern, because high-frequency impulse has identical ON time with low-frequency pulse, so in a work period, controller adopts high-frequency impulse work to transmit more energy to output.Thereby, as the output voltage (V that samples
o) be lower than reference voltage (V
Ref) time, pulse selector selects high-frequency impulse as drive signal, and output voltage rises; On the contrary, when the output voltage that samples was higher than reference voltage, pulse selector adopted low-frequency pulse as drive signal, and output voltage descends.After the system stability work, driving pulse is a kind of combination of high-frequency impulse and low-frequency pulse in a big cycle period, and shared separately proportion is determined by power output.Be load when increasing the weight of, controller will be chosen more high-frequency impulse work in cycle period.
In this example, the concrete course of work and principle are: in the finish time of any one pulse signal, logic control circuit is responsible for producing a narrow pulse signal in order to enable sample/hold circuit, and the output voltage that samples is compared with reference voltage immediately.When sampled value during greater than reference voltage, comparator is with output low level, and the expression output voltage has surpassed desired value, and controller will be selected low-frequency pulse work for use, and output voltage is descended; Otherwise controller will select for use high-frequency impulse that output voltage is risen.Logic control circuit also is responsible for the height of the current selected pulse frequency of recording controller, and produces a burst pulse in the finish time of this pulse accordingly and enable sample/hold circuit once more, enters circulation next time.Under steady-working state, output voltage will be near reference voltage one very among a small circle in fluctuation.
Analysis of simulation result:
Fig. 4 carries out the result of time-domain-simulation for adopting Pspice software to control method of the present invention, and the transverse axis of Fig. 4 component (a) and (b) is the time (ms), and the longitudinal axis (a) is drive signal amplitude (V), and the longitudinal axis (b) is output voltage (V).As can be seen, the pulse of drive signal medium and low frequency has occupied major part in Fig. 4, illustrates that load is lighter.Simulated conditions: input voltage V
In=14V, output voltage V
o=V
Ref=6V, inductance L=5.6uH, capacitor C=1000uF, load R=5 Ω, high frequency f
H=56KHz, low frequency f
L=18KHz, fixedly ON time is 6us.
Fig. 5 occurs output voltage dynamic response time-domain-simulation oscillogram under the sudden change situation for adopting traditional electrical die mould PWM modulation and Switching Power Supply of the present invention in load, the respectively corresponding traditional electrical die mould PWM modulation of component (a) and (b) and the present invention, transverse axis is the time (ms), is output voltage (V) in length and breadth.Among Fig. 5, load is changed to 3.2A by the 1.2A step when 12ms, adopts traditional electrical die mould PWM modulation (switching frequency f
s=37KHz), system response time needs 1.6ms, and can produce side-play amount up to 0.3V; And adopt transient response speed of the present invention very fast, and almost there are not response time and side-play amount, system enters stable state immediately.As seen adopt Switching Power Supply of the present invention to have good load dynamic characteristic.
Fig. 6 is for adopting traditional electrical die mould PWM modulation and Switching Power Supply power switch pipe of the present invention drain electrode and voltage between source electrodes signal simulation spectrogram, the respectively corresponding traditional electrical die mould control of component (a) and (b) and the present invention, transverse axis is frequency (KHz), and the longitudinal axis is power switch pipe leakage, the amplitude (V) of voltage between source electrodes signal behind Fourier transform (FFT).As can be seen from Fig. 6, adopt the present invention after, power switch pipe leaks, the voltage between source electrodes signal has littler amplitude at the corresponding frequencies place, thereby system will produce littler electromagnetic interference (EMI) noise, helps the design of electromagnetic interface filter.
Adopt technical scheme 2.:
Fig. 7 illustrates, and the present invention adopts technical scheme embodiment 2. to be: the Bifrequency control method of Switching Power Supply and device thereof, its controller mainly are made up of comparator, pulse period selector, impulse generator and drive circuit.Output voltage installs the back after testing and reference voltage is compared, and output relatively is used for the work of control impuls cycle selector; The detected current signal of current sensing means is compared with peak current, relatively output and pulse period selector acting in conjunction are in pulse generator, the pulse signal that produces is used for the switching device of power controlling converter behind drive circuit, obtain stable output voltage thus.
Fig. 8, Fig. 9 have provided the 2. application in the Buck converter under working in the discontinuous current pattern of bifrequency control technology scheme.The concrete course of work and principle are: in the zero hour of any one pulse signal, a burst pulse enables the sample/hold circuit circuit, the output voltage (V that samples
o) and reference voltage (V
Ref) compare, output relatively is used to select the length of work at present pulse period.f
H', f
L' be and f
H, f
LThe burst pulse of same frequency is in order to enable sample/hold circuit and set rest-set flip-flop.When the output voltage that samples was lower than reference voltage, controller was selected f
H' work, show that the work at present pulse should select high-frequency impulse f for use
HIn order to promote output voltage; Otherwise when output voltage was higher than reference voltage, controller was selected f
L' work, show that the work at present pulse should select low-frequency pulse f for use
LIn order to reduce output voltage.In the zero hour of any one pulse signal, controller has been compared with reference voltage by the voltage that samples and has been determined the length that current period continues, and the set rest-set flip-flop, makes Q end output high level, switching tube S conducting, inductive current (i
L) the linear rising of starting from scratch.Detected inductive current of current sensing means and peak current (I
Peak) relatively, when inductive current rose to peak current, the comparator output level changed and the rest-set flip-flop that resets rapidly, made Q end output low level, switching tube S turn-offs, and inductive current descends, up to the arriving of next pulse signal set rest-set flip-flop once more.Behind the switch converters steady operation, in any one switch periods, inductive current all is with a fixed slope linear rising of starting from scratch, because peak current is changeless, so high-frequency impulse has identical ON time with low-frequency pulse, thereby the work of employing high-frequency impulse can be to the load transfer more energy.Also, make that switching tube just automatically shut down when in a single day inductive current reached peak current, thereby realize the overcurrent protection of circuit automatically just because of the existence of peak current.When load increases the weight of, controller will be selected more high-frequency impulse f for use
HWork; Otherwise controller will be selected more low-frequency pulse f for use
LWork.In a word, to keep output voltage according to the combination that output state is adjusted the high and low frequency pulse automatically constant for the bifrequency controller.
Embodiment two
Figure 10 illustrates, and this example is compared with embodiment one, and power inverter is an anti exciting converter, and control device is identical with embodiment one.Prove by emulation equally, adopt the output voltage stabilization of anti exciting converter of the present invention, rapid dynamic response speed, the electromagnetic interference (EMI) noise is little.
The present invention also can be used for the Switching Power Supply of Boost converter, Buck-boost converter, Cuk converter, forward converter, half-bridge converter, full-bridge converter constant power circuit composition except can be used for controlling two kinds of power inverters in the foregoing description.
Claims (5)
1, the Bifrequency control method of Switching Power Supply is characterized in that, according to the output state of switch converters, controller adopts the different pulse of two class frequencys to make up, to realize the control to switch converters.
2, the Bifrequency control method of Switching Power Supply according to claim 1, it is characterized in that, any one pulse signal ends output voltage values of Switching Power Supply constantly feeds back to voltage comparator, and compare: when the output voltage that samples is lower than reference voltage with reference voltage value, pulse selector selects high-frequency impulse as drive signal, and output voltage rises; On the contrary, when the output voltage that samples was higher than reference voltage, pulse selector adopted low-frequency pulse as drive signal, and output voltage descends, thereby realized the bifrequency control of Switching Power Supply.
3, the Bifrequency control method of Switching Power Supply according to claim 1, it is characterized in that, at the actuating switch pipe zero hour of any one pulse signal, inductive current begins to rise, detect inductive current simultaneously, when inductive current rises to peak current, switching tube turn-offs, turn-off time is by the magnitude relationship decision when the prepulse output voltage zero hour and reference voltage, the turn-off time decision work at present pulse of switching tube is low frequency or high-frequency impulse, thereby realizes the bifrequency control of Switching Power Supply.
4, a kind of device of realizing the Bifrequency control method of the described Switching Power Supply of claim 2 is made up of voltage check device, comparator, impulse generator, pulse selector and drive circuit; It is characterized in that voltage check device, comparator, pulse selector and drive circuit are linked in sequence; The impulse generator that can produce two kinds of different frequency pulses is connected on the pulse selector.
5, a kind of device of realizing the Bifrequency control method of the described Switching Power Supply of claim 3 is characterized in that, is provided with the current ratio that is made of current sensing means and comparator and links to each other with the impulse generator that produces two kinds of different frequency pulses than branch road.
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| JP2765315B2 (en) * | 1991-11-18 | 1998-06-11 | 株式会社日立製作所 | Power conversion device and control device for electric vehicle using the same |
| US5932976A (en) * | 1997-01-14 | 1999-08-03 | Matsushita Electric Works R&D Laboratory, Inc. | Discharge lamp driving |
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| WO2006118056A1 (en) * | 2005-04-27 | 2006-11-09 | Matsushita Electric Industrial Co., Ltd. | Two-point modulation type phase modulating apparatus, polar modulation transmitting apparatus, radio transmitting apparatus, and wireless communication apparatus |
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