CN101686010B - Double-frequency control method for switch power supply in quasi-continuous operation mode and device therefor - Google Patents
Double-frequency control method for switch power supply in quasi-continuous operation mode and device therefor Download PDFInfo
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- CN101686010B CN101686010B CN2009100584204A CN200910058420A CN101686010B CN 101686010 B CN101686010 B CN 101686010B CN 2009100584204 A CN2009100584204 A CN 2009100584204A CN 200910058420 A CN200910058420 A CN 200910058420A CN 101686010 B CN101686010 B CN 101686010B
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Abstract
The present invention discloses a dual-frequency control method for switch converter in quasi-continuous operation mode and a device therefor. A controller controls the power output of a power converter which operates in inductor current quasi-continues mode; the controller combines two pulses with two different frequencies according to the output state of the power converter, so as to realize the control of the power output of the converter. The drive of a main power switch tube is a combination of two pulses having two different frequencies. The invention can be used for multiple topological structures of switch converters, has the advantages of stable and reliable control, no need of compensation network, large output power scope and fast transient response speed.
Description
Technical field
The present invention relates to quasicontinuous working model switch power supply Bifrequency control method and device thereof.
Background technology
Along with the fast development of power electronic technology and power electronic device, the advantage of Switching Power Supply is more and more obvious, all uses Switching Power Supply as power supply in a lot of applications, has promoted developing rapidly of switch power technology more.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, Boost converter, Buck-Boost converter, forward converter, anti exciting converter etc.Controller is used for the work of power controlling converter, and its structure and operation principle are by control method decision that Switching Power Supply adopted.Because common power inverter topology can satisfy basic need, and 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.
Traditional voltage-type pulse width modulating technology is the most common a kind of Switching Power Supply control method.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, with the switching of control switch device, make output voltage reach desired value.Adopt the Switching Power Supply transient response speed of traditional electrical die mould pulse width modulating technology slower, COMPENSATION NETWORK DESIGN is comparatively loaded down with trivial details in addition.
Summary of the invention
The control method that the purpose of this invention is to provide a kind of Switching Power Supply---work in the Switching Power Supply bifrequency control of inductive current quasi-continuous operation mode.When adopting this control method, controller is reliable and stable, need not compensating network, and output power range is big, and rapid dynamic response speed is applicable to multiple converter topology structure.
The present invention is for solving its technical problem, and the technical scheme that is adopted is: the quasicontinuous working model switch power supply Bifrequency control method, and by the power output of controller power controlling converter, power inverter is operated in the quasi-continuous pattern of inductive current; Controller selects for use the different pulse of two class frequencys to make up according to the output state of power inverter, realizes control to inverter power output with this.
When reality is implemented, generally adopt following two possibilities:
1. detect output voltage in the finish time of any one pulse signal, and compare with reference voltage, comparative result is selected the foundation of low frequency or high-frequency impulse as next working pulse; Detect inductive current simultaneously, when it drops to reference current, the continued flow switch conducting at inductance two ends, inductive current remains unchanged, thereby realizes the bifrequency control of Switching Power Supply based on quasi-continuous pattern.Adopt such structure can make control stabilization reliable, need not compensating network, output power range is big, and transient response speed is fast.
2. at the conducting zero hour of any one pulse signal main switch, inductive current rises, detect inductive current simultaneously, when inductive current rises to peak current, main switch turn-offs, inductive current descends, when inductive current drops to reference current, the continued flow switch conducting at inductance two ends, inductive current remains unchanged, when the magnitude relationship of the prepulse output voltage zero hour and reference voltage decision work at present pulse is high frequency or low-frequency pulse, thereby realize the bifrequency control of quasicontinuous working model switch power supply.It is characterized in that: control stabilization is reliable, need not compensating network, and output power range is big, and transient response speed is fast, and can realize the overcurrent protection of circuit automatically.
Compared with prior art, 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 the shared ratio of rapid adjustment two frequency pulses, make Switching Power Supply recover stable state rapidly, have transient response speed faster;
Another object of the present invention provides the device of the Bifrequency control method of realizing above-mentioned quasicontinuous working model switch power supply.Whole device is made up of power inverter and controller, and the drive circuit in the controller links to each other with switching device in the power inverter; Be provided with continued flow switch between quasi-continuous mode controller in controller and the filter in the power inverter.Corresponding to the two kinds of technical schemes that Bifrequency control method adopted that realize quasicontinuous working model switch power supply, two kinds of devices of realizing the Bifrequency control method of quasicontinuous working model switch power supply are provided accordingly: 1. scheme is made up of the voltage check device, comparator, impulse generator, pulse selector, drive circuit and the quasi-continuous mode controller that are arranged in the controller; Comparator is connected between voltage check device and the pulse selector; Be connected between impulse generator and the drive circuit by the pulse selector of voltage comparator control.Voltage check device detects output voltage, and comparing with reference voltage then is used for the control impuls selector; It is selective that impulse generator generates the different pulse of two class frequencys, and last control impuls is by the work of drive circuit control main circuit; Quasi-continuous mode controller is used to control the continued flow switch at inductance two ends, makes converter be operated in the quasi-continuous pattern of inductive current.2. scheme is made up of voltage check device, current comparator, voltage comparator, pulse period selector, current sensing means, impulse generator, drive circuit and quasi-continuous mode controller; Current comparator is connected between current sensing means and the impulse generator; Voltage comparator is connected between voltage check device and the pulse period selector; Be connected between current comparator and the drive circuit by the impulse generator of voltage comparator control; The pulse period selector is connected between voltage comparator and the impulse generator.Voltage check device detects output voltage, compares with reference voltage then, and comparator output is used for the control impuls cycle selector; Current sensing means detects inductive current, compares with peak current again, and relatively output generates control impuls with pulse period selector acting in conjunction in impulse generator, and last control impuls is by the work of drive circuit control main circuit; Quasi-continuous mode controller is used to control the continued flow switch at inductance two ends, makes converter be operated in the quasi-continuous pattern of inductive current.
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 the groundwork waveform schematic diagram of the embodiment of the invention one circuit.
Fig. 4 is in the embodiment of the invention one, the time-domain-simulation oscillogram of Switching Power Supply.
Fig. 5 is the different control methods of the Buck converter using output voltage simulation waveform figure when load changing with identical main circuit parameter.
Fig. 6 is that control system of the present invention adopts technical scheme implement device structured flowchart 2..
Fig. 7 adopts technical scheme electrical block diagram 2. for the present invention.
Fig. 8 is a circuit groundwork waveform schematic diagram shown in Figure 7.
Fig. 9 is the electrical block diagram of the embodiment of the invention two.
Among Fig. 4: (a) be the drive signal waveform of the main switch of controller output; (b) be the converter inductive current waveform; (c) be the converter output voltage waveforms.
Among Fig. 5: (a) adopt traditional electrical die mould PWM modulation; (b) adopt bifrequency control; (c) adopt 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 quasicontinuous working model switch power supply and device thereof, its controller mainly are made up of comparator, pulse generation circuit, pulse selector, drive circuit and quasi-continuous mode controller.Output voltage installs the back after testing and compares with reference voltage, and comparative result is used for the work of control impuls selector; Pulse generation circuit produces two groups and has identical ON time but the different pulse confession pulse selector selection of frequency; Pulse selector output is used for the main switch of power controlling converter behind drive circuit; Quasi-continuous mode controller is used for controlling continued flow switch and is operated in the quasi-continuous pattern of inductive current to guarantee converter.
Fig. 2 has provided the application of bifrequency control technology in the Buck converter of quasi-continuous operation mode switch converters.Unique difference of the Buck that main circuit is more common is to have increased a continued flow switch pipe SW2 at the inductance two ends, is used for controlling inductive current (i
L), when its conducting, inductive current remains unchanged, so that converter is operated under the quasi-continuous pattern of inductive current.
In this example, the concrete course of work and principle are: in the finish time of each working pulse, logic control circuit is responsible for producing a burst pulse and is used to enable the sampling hold circuit and the rest-set flip-flop that resets, the output voltage (V that samples
o) and reference voltage (V
Ref) compare, the foundation of low frequency or high-frequency impulse work is selected in comparator output as next driving pulse of main switch.When output voltage was lower than reference voltage, controller selected high-frequency impulse work to promote output voltage; Otherwise when output voltage was higher than reference voltage, controller selected low-frequency pulse work to reduce output voltage.During master power switch pipe SW1 conducting, induction charging, inductive current rises; Inductive current descended when SW1 turn-offed, and dropped to the current reference (I of this moment when inductive current
Ref) time, be used to control the rest-set flip-flop set of continued flow switch pipe, continued flow switch SW2 conducting, inductive current remains unchanged.When finish time of prepulse, the burst pulse that logic control circuit the produces rest-set flip-flop that when enabling sampling hold circuit, resets, SW2 turn-offs, the SW1 conducting, inductive current rises once more, enters circulation next time.Current reference value and power output are closely related, and power output is big more, and the current reference value is also big more, obtain the current reference value by real-time detection output current.
Fig. 3 is drive waveforms and the inductive current waveform of switching tube SW1, SW2.Fig. 3 illustrates, and during master power switch pipe SW1 conducting, inductive current is from I
RefThe place begins to rise; SW1 turn-offs then, and inductive current descends.When inductive current drops to I
RefThe time, switching tube SW2 conducting, this moment, inductive current was kept I
RefConstant, up to next working pulse SW1 conducting once more.Because I
RefExistence, power input can be to the load transfer more energy, thereby makes the bifrequency control of quasi-continuous operation mode switch converters can be applied to broader output power range.
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, the transverse axis of Fig. 4 component (a) and (b), (c) is the time (ms), (a) the longitudinal axis is drive signal amplitude (V), and the longitudinal axis (b) is electric current (A), and the longitudinal axis (c) is voltage (V).As seen from Figure 4, converter is operated in the quasi-continuous pattern of inductive current, and the driving of main switch is the combination of two different frequency pulse signals.
Fig. 5 suddenlys change to 33W by 9W when loading on 8ms for adopting (a) traditional electrical die mould PWM modulation, the control of (b) bifrequency, (c) Buck converter output voltage simulation waveform figure when load changing with identical main circuit parameter of the present invention respectively.As can be seen from Figure 5, the converter that adopts traditional electrical die mould PWM modulation is when load changing, and the output voltage fluctuation is bigger, and the adjustment time is longer; Bifrequency control has identical frequency pulse with the present invention, but bifrequency is when being controlled at load changing, owing to do not provide the bearing power of 33W, thereby output voltage is littler much than reference voltage; And adopt converter of the present invention owing to be operated in the quasi-continuous pattern of inductive current, output can transmit more energy to load end, thereby output voltage stabilization during load changing, and as can be seen from the figure, when load changing, adopt converter of the present invention to have very fast transient response speed.
Adopt technical scheme 2.:
Fig. 6 illustrates, the present invention adopts technical scheme embodiment 2. to be: the Bifrequency control method of quasicontinuous working model switch power supply and device thereof, its controller mainly are made up of comparator, pulse period selector, impulse generator, drive circuit and quasi-continuous mode controller.Output voltage installs the back after testing and compares with reference voltage, and the pulse period selector is selected high or low frequency pulse according to comparative result; The current sensor senses inductive current, and compare with peak current, relatively output is used from the control impuls maker with pulse period selector output one; Impulse generator output is used for the main switch of power controlling converter behind drive circuit; Quasi-continuous mode controller is used for controlling continued flow switch and is operated in the quasi-continuous pattern of inductive current to guarantee converter.
Fig. 7, Fig. 8 have provided the 2. application in the Buck converter of bifrequency control technology scheme of quasi-continuous operation mode switch converters.Be with technical scheme difference 1.: the technical scheme 2. driving pulse of main switch only need be selected according to rule no longer as the 1. prior generation of technical scheme, and technical scheme is 2. by configuring inductive current peak (I in advance
Peak) and inductive current fiducial value (I
Ref) produce driving pulse, the concrete course of work and principle are: in the finish time of previous pulse, the zero hour of also promptly working as prepulse, controller produces a burst pulse (NP) and enables sample/hold circuit, and make main switch SW1 conducting and turn-off continued flow switch SW2, the output voltage (V that samples
o) and reference voltage (V
Ref) compare, relatively the output decision work at present pulse period is T
HOr T
Lf
H ', f
L 'For with f
H, f
LThe burst pulse of same frequency is in order to enable sample/hold circuit and to put, reset rest-set flip-flop.If the output voltage that samples the zero hour when prepulse is selected f less than reference voltage
H 'As burst pulse, i.e. work at present pulse is high-frequency impulse f
HWhen the output voltage that samples during, select f greater than reference voltage
L 'As burst pulse, the work at present pulse is low-frequency pulse f
LDuring switching tube SW1 conducting, inductive current (i
L) begin linear the rising from reference current.Detected inductive current of current sensing means and peak current compare, and when inductive current rose to peak current, main switch turn-offed, and inductive current descends.When inductive current drops to reference current, continued flow switch SW2 conducting, inductive current is kept I
RefConstant, up to next working pulse arriving main switch conducting, inductive current begins to rise from reference current value once more.Behind the converter steady operation, in any one frequency pulse, inductive current all is to begin linear the rising with a fixed slope from reference current value, because peak current is changeless, so two frequency pulses have identical ON time, thereby high-frequency impulse can transmit more energy to load end.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 just because of the existence of peak current.
Embodiment two
Fig. 9 illustrates, and this example is compared with embodiment one, and just power inverter has partly made the Buck-Boost converter into, and control device is identical with embodiment one.Prove by emulation equally, adopt the output voltage stabilization of Buck-Boost converter of the present invention, rapid dynamic response speed, output power range is bigger.
The present invention also can be used for the Switching Power Supply of Boost converter, Cuk converter constant power circuit composition except can be used for controlling two kinds of power inverters in the foregoing description.
Claims (2)
1. the quasicontinuous working model switch power supply Bifrequency control method is exported by the power of controller power controlling converter, and it is characterized in that: power inverter is operated in the quasi-continuous pattern of inductive current; Controller selects for use the different pulse of two class frequencys to make up according to the output state of power inverter, realizes control to inverter power output with this; That is: feed back output voltage in the finish time of any one pulse signal and go into comparator, and compare with reference voltage, comparative result is selected the foundation of low frequency or high-frequency impulse as next working pulse; Detect inductor current signal simultaneously and go into current comparator and reference current comparison, when it drops to reference current, the continued flow switch conducting at inductance two ends, inductive current remains unchanged, thereby realizes the bifrequency control of quasicontinuous working model switch power supply.
2. a device of realizing the Bifrequency control method of the described quasicontinuous working model switch power supply of claim 1 is made up of power inverter and controller, it is characterized in that, the drive circuit in the controller links to each other with switching device in the power inverter; Be provided with continued flow switch between quasi-continuous mode controller in controller and the filter in the power inverter; Described controller is made up of the voltage check device, comparator, impulse generator, pulse selector, drive circuit and the quasi-continuous mode controller that are arranged in the controller; Comparator is connected between voltage check device and the pulse selector; Be connected between impulse generator and the drive circuit by the pulse selector of voltage comparator control.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100584204A CN101686010B (en) | 2009-02-25 | 2009-02-25 | Double-frequency control method for switch power supply in quasi-continuous operation mode and device therefor |
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|---|---|---|---|
| CN2009100584204A CN101686010B (en) | 2009-02-25 | 2009-02-25 | Double-frequency control method for switch power supply in quasi-continuous operation mode and device therefor |
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| CN101686010B true CN101686010B (en) | 2011-09-21 |
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| CN103944382B (en) * | 2014-04-03 | 2016-12-07 | 天津大学 | Eliminate the current-mode control method in Buck code converter electric current dead band |
| CN109062303B (en) * | 2018-05-02 | 2020-07-14 | 华中科技大学 | High-stability flat-top pulse high-intensity magnetic field generating device and control method |
| CN110460237B (en) * | 2019-09-11 | 2021-01-29 | 西南交通大学 | Control method and device for PCCM Boost converter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5349523A (en) * | 1993-02-22 | 1994-09-20 | Yokogawa Electric Corporation | Switching power supply |
| CN101242134A (en) * | 2008-03-05 | 2008-08-13 | 许建平 | Switch power control method and its device |
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2009
- 2009-02-25 CN CN2009100584204A patent/CN101686010B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5349523A (en) * | 1993-02-22 | 1994-09-20 | Yokogawa Electric Corporation | Switching power supply |
| CN101242134A (en) * | 2008-03-05 | 2008-08-13 | 许建平 | Switch power control method and its device |
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