CN109995234A - Using the Average Current Control device and method of capacitor current feedback - Google Patents
Using the Average Current Control device and method of capacitor current feedback Download PDFInfo
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- CN109995234A CN109995234A CN201910311373.3A CN201910311373A CN109995234A CN 109995234 A CN109995234 A CN 109995234A CN 201910311373 A CN201910311373 A CN 201910311373A CN 109995234 A CN109995234 A CN 109995234A
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- current
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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
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention provides a kind of Average Current Control device and method using capacitor current feedback, the output voltage and reference voltage of detection generate Voltage loop error signal after the effect of Voltage loop error amplifier, the error signal and the inductor current signal of detection are acted on through electric current loop error amplifier generates electric current loop error signal, the capacitance current signal pulse width-modulated device of the electric current loop error signal and detection, drive pulse signal is generated, then output voltage and output electric current are adjusted by driving circuit control switch device.It is characterized in that using capacitor current feedback signal as current inner loop control signal.The invention outstanding advantages are: compared with traditional average ionization ratio, the present invention improves the current transient response speed of switch converters.
Description
Technical field
The present invention relates to switch power supply equipment technical fields, more particularly to a kind of average electricity using capacitor current feedback
Flow control device and method.
Background technique
Continuous with electronic product is popularized, and as the power resources of various electronic equipments, power supply is one particularly significant
Building block.Conventional linear power supply has been unable to satisfy the demand of High performance electronics, especially communication, microelectronics, space flight
Etc. requirement of the high and new technologies industry to power technology it is higher and higher, Switching Power Supply is small in size, light-weight and high-efficient etc. because having
Advantage has obtained the very big concern of academia and engineering circles, and has become a branch the most active in field of power electronics.
However, the function with electronic product is stronger and stronger, to the working performance of Switching Power Supply, especially mapping, propose
Increasingly higher demands.
Switching Power Supply is mainly made of switching power converter and control circuit two parts, wherein switching power converter benefit
The transmitting and transformation of electric energy, control of the control circuit according to target call to control variable are realized with device for power switching.It is common
Switching power converter topological structure have Buck converter, Boost, One Buck-Boost converter body, forward converter,
Flyback converter etc..Control circuit is able to detect the variation of switching power converter control amount (such as inductive current, output voltage),
And the working condition of corresponding pulse signal control switch power inverter device for power switching is generated accordingly, to adjust transmitting
To the energy of load, that realizes switching power converter stablizes output.The structure and working principle of control circuit are by switch power
Control method used by converter determines.For given switch converters topology, using different control methods to system
Stable state accuracy and dynamic property etc. generate different influences.For given application, the topology of switching power converter
Structure is often fixed, and therefore, the design of control circuit largely decides the working performance of Switching Power Supply.
Traditional Average Current Control technology is a kind of common switch converters control method, has current control accuracy
The advantages that height, strong antijamming capability, and be therefore applied in various electronic products.However, traditional Average Current Control technology
The mapping of control switch power inverter is poor.Therefore, it is necessary to be improved to traditional Average Current Control technology.
Capacitor current feedback control is a kind of novel control technology, and the output capacitance electric current of switch converters is used to believe
Number as control signal, has the function of intrinsic load-current feedforward, it can be achieved that quick load response speed.
Summary of the invention
The technical problems to be solved by the present invention are: in order to overcome the shortcomings in the prior art, the present invention provides one kind and adopts
With the Average Current Control device and method of capacitor current feedback, the transient response speed of traditional Average Current Control technology is improved
Degree.
The present invention solves its technical problem technical solution to be taken: a kind of average electricity using capacitor current feedback
Flow control device, including the power circuit and controller for Switching Power Supply, wherein
Power circuit includes sequentially connected input unit, switching device, filter and output device, and input unit connects
It is connected to switching device, filter is transferred to after switching device, output device is entered after the effect of filter device；
Controller includes voltage check device, reference voltage, Voltage loop error amplifier, inductive current sampling device, electricity
Ring error amplifier, capacitance current sampling apparatus, pulse-width modulator and driving circuit are flowed, voltage check device input terminal connects
It connects on an output device, the output end and reference voltage of voltage check device be separately connected Voltage loop error amplifier two are defeated
Enter end；Inductive current sampling device input terminal and capacitance current sampling apparatus input terminal are connected on filter, inductive current
The output end of sampling apparatus and the output end of Voltage loop error amplifier are separately connected two inputs of electric current loop error amplifier
End, the output end of electric current loop error amplifier connect two of pulse-width modulator with the output end of capacitance current sampling apparatus
The output end connection driving circuit of input terminal, pulse-width modulator is connected to switching device after driving circuit, for controlling
The input terminal of the conducting and shutdown of switching device processed, switching device connects input unit.
Voltage check device detects output voltage, carries out error amplification by Voltage loop error amplifier with reference voltage,
Obtain voltage error signal；Inductive current detection device detects inductive current, and the voltage error signal provided with Voltage loop passes through
Electric current loop error amplifier carries out error amplification, obtains electric current loop error signal；Electric current loop error signal and electric capacitance current are examined
The inductive current of device detection is surveyed by pulse-width modulator, generates drive pulse signal, drive pulse signal passes through driving
The work of circuit control main circuit.
A kind of Average Current Control method using capacitor current feedback, including foregoing circuit, further comprising the steps of:
When the input of Switching Power Supply is connected to the voltage V of input unitinWhen, i.e., when Switching Power Supply powers on, by voltage detecting
The output voltage v of device detection output deviceo, and the output voltage v that will testoWith reference voltage VrefIt is put through Voltage loop error
Big device effect generates Voltage loop error signal vcon_v；Meanwhile the inductive current letter of inductive current sampling device acquisition filter
Number RSiL；The inductor current signal R detectedSiLWith Voltage loop error signal vcon_vIt acts on and generating through electric current loop error amplifier
Electric current loop error signal vcon_i；Meanwhile the capacitance current signal R of capacitance current sampling apparatus acquisition filterCiC；Then,
Electric current loop error signal vcon_iWith capacitance current signal RCiCDrive pulse signal is generated by pulse-width modulator, by driving
Dynamic circuit, the turn-on and turn-off of control switch device.To the output voltage and output electric current of regulating switch power inverter.
When sampling capacitance current signal is less than electric current loop error signal, pulse-width modulator exports and keeps high level
Signal, through overdrive circuit, conducting power switch pipe；Conversely, pulse-width modulator exports and keeps low level signal, shutdown
Power switch tube.
The beneficial effects of the present invention are: the present invention improves switching power converter compared with traditional Average Current Control
Current transient response speed when electric current loop error signal mutates.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawings and detailed description.
Fig. 1 is control system realization device structural block diagram of the invention；
Fig. 2 is the electrical block diagram of the embodiment of the present invention；
Fig. 3 is the Buck converter of the embodiment of the present invention and traditional Average Current Control in current controling signal positive transition
Time-domain-simulation waveform diagram；Wherein, (a) current controling signal waveform；(b) transmission of electricity of traditional Average Current Control Buck converter
Inducing current waveform；(c) the inductive current waveform of the method for the present invention control Buck converter.
Fig. 4 is the Buck converter of the embodiment of the present invention and traditional Average Current Control in the negative jump of current controling signal
Time-domain-simulation waveform diagram；Wherein, (d) current controling signal waveform；(e) transmission of electricity of traditional Average Current Control Buck converter
Inducing current waveform；(f) the inductive current waveform of the method for the present invention control Buck converter.
In figure: 1, input unit, 2, switching device, 3, filter, 4, output device, 5, voltage check device, 6, base
Quasi- voltage, 7, Voltage loop error amplifier, 8, inductive current sampling device, 9, electric current loop error amplifier, 10, capacitance current adopts
Sampling device, 11, pulse-width modulator, 12, driving circuit.
Specific embodiment
Presently in connection with attached drawing, the present invention is described in detail.This figure is simplified schematic diagram, is only illustrated in a schematic way
Basic structure of the invention, therefore it only shows the composition relevant to the invention.
As shown in Figure 1, a kind of Average Current Control device using capacitor current feedback of the invention, dotted line frame is outside function
Rate circuit, comprising: input unit 1, switching device 2, filter 3 and output device 4；Connection relationship: input unit 1 is connected to
Switching device 2 is transferred to filter 3 after switching device 2, and output device 4 is entered after the effect of filter device 3.
Wherein, input unit 1 is can to use lithium battery or battery etc. for providing the device of input voltage；Switch
Device 2 can be using field-effect tube, triode etc.；Filter 3 can using the low-pass filter that inductance and capacitor form or
The filter of independent inductance composition；Power resistor, super capacitor, microprocessor or LED etc. can be used in output device 4.
It is controller in dotted line frame, comprising: voltage check device 5, reference voltage 6, Voltage loop error amplifier 7, inductance
Current sampling device 8, electric current loop error amplifier 9, capacitance current sampling apparatus 10, pulse-width modulator 11 and driving circuit
12；Connection relationship: the voltage check device 5 and reference voltage 6 being connected in output 4 are separately connected Voltage loop error amplifier 7
Two input terminals；It is connected to the output end of the inductive current sampling device 8 and Voltage loop error amplifier 7 on filter 3
Two input terminals of electric current loop error amplifier 9 are separately connected, the output end of electric current loop error amplifier 9 is filled with filtering is connected to
Set the output end connection pulse-width modulator 11 of the capacitance current sampling apparatus 10 on 3, the output of pulse-width modulator 11
End connection driving circuit 12, conducting and shutdown after driving circuit 12, for control switch device 2.
Wherein, voltage check device 5 can be using the voltage follower built by operational amplifier；Reference voltage 6 can be with
It is provided by accessory power supply or voltage stabilizing chip provides；Voltage loop error amplifier 7 can be mended using the PI built by operational amplifier
Repay device or PID compensator；Inductive current sampling device 8 and capacitance current sampling apparatus 10 can be used to be built by operational amplifier
Differential amplifier circuit realize；Electric current loop error amplifier 9 can be compensated using the integrator or PI built by operational amplifier
Device；Pulse-width modulator 111 can be made of comparator, clock generator and rest-set flip-flop；Driving circuit 12 can use
The driving chips such as IR2125 or IR2110.
Fig. 2 gives application of the present invention in Buck converter, and input unit 1 is using battery as defeated in the present embodiment
Enter signal, input voltage VinRange can select 10V-20V；Using field-effect tube S as switching device 2, preferably model
IRF540；The low-pass filter constituted using inductance and capacitor is as filter 3；Using power resistor R as output device
The range of 4, power resistor R are 0.5 Ω -10 Ω；It is filled using the voltage follower built by operational amplifier as voltage detecting
Set 5；Reference voltage 6, preferably model 78L05 are provided using voltage stabilizing chip；Made using the PI compensator built by operational amplifier
For Voltage loop error amplifier 7；It is filled using the differential amplifier circuit built by operational amplifier as inductance/capacitance current sample
Set 8 and 10；Using the integrator built by operational amplifier as electric current loop error amplifier 9；Using by comparator, clock hair
The pulse-width modulator that raw device and rest-set flip-flop are constituted is as pulse-width modulator 11；Using integrated drive chips as drive
Dynamic circuit 12, preferably model IR2125.
Its specific course of work and principle are as follows: in sampling instant, the output voltage that will test by voltage check device
voWith reference voltage VrefVoltage loop error signal v is generated through Voltage loop error amplifiercon_v.Meanwhile inductive current detection device
The inductor current signal R that will testSiLWith Voltage loop error signal vcon_vElectric current loop is generated through electric current loop error amplifier to miss
Difference signal vcon_i, the capacitance current signal R of capacitance current detection device acquisition filterCiC.Then, electric current loop error signal
vcon_iWith capacitance current signal RCiCIt is compared by pulse-width modulator, output driving pulse signal.Work as sampling capacitance
Current signal RCiCLess than electric current loop error signal vcon_iWhen, pulse-width modulator exports and keeps high level, opens power
Close pipe conducting；Conversely, pulse-width modulator exports and keep low level, turn off power switch tube, thus regulating switch function
Rate converter steady operation.
Fig. 3 is that the Buck converter controlled respectively traditional Average Current Control and the method for the present invention using PSIM software is existed
Simulation waveform when electric current loop error signal positive transition, simulated conditions: input voltage Vin=15V, output voltage vo=Vref=
5V, inductance L=50 μ H, capacitor C=330 μ F, capacitor equivalent series resistance r=20m Ω, load R=1 Ω, current detecting coefficient
RS=1V/A, switch periods TS=10 μ s, sawtooth period Tsaw=10 μ s, sawtooth wave amplitude Vm=3V.
Fig. 3 component (a), (b), (c) respectively correspond the Buck converter of electric current loop error signal, traditional Average Current Control
Inductive current, the method for the present invention control Buck converter inductive current.Component (a), (b), (c) horizontal axis be the time
(ms), the longitudinal axis of (a) is electric current loop error voltage (V), and (b) and the longitudinal axis of (c) is inductive current (A).In Fig. 3, dividing
Scheme in (a), in 8.5ms, electric current loop error signal is jumped from 5V to 7V；From component (b) as can be seen that traditional average current control
The upper punching of the Buck converter inductive current of system is 2.57A, undershoot 1.26A, and new stable state institute is entered from original stable state
The recovery time needed is about 0.188ms；From component (c) as can be seen that the Buck converter inductance electricity that the method for the present invention controls
The upper punching and undershoot very little of stream, almost nil, it is also very short to enter recovery time required for new stable state from original stable state,
Can almost it ignore.It can thus be seen that when positive transition occurs for electric current loop error signal, the transient response speed of the method for the present invention
Degree is substantially better than traditional Average Current Control technology.
Fig. 4 is that the Buck converter that traditional Average Current Control and the method for the present invention control bears jump in electric current loop error signal
Simulation waveform when change.Component (d), (e), (f) horizontal axis be time (ms), the longitudinal axis (d) is electric current loop error signal
The longitudinal axis of voltage (V), (e) and (f) is inductive current (A).In Fig. 4, in component (a), in 8.5ms, electric current loop error letter
It number jumps from 5V to 3V；From component (b) as can be seen that the undershoot of the Buck converter inductive current of traditional Average Current Control is
2.218A, upper punching is 0.67A, and it is about 0.17ms that recovery time required for new stable state is entered from original stable state；From point
Scheming (c) can be seen that the upper punching and undershoot very little of Buck converter inductive current of the method for the present invention control, almost nil, from
It is also very short that stable state originally enters recovery time required for new stable state, can almost ignore.It can thus be seen that when electricity
When negative jump occurs for stream ring error signal, the transient response speed of the method for the present invention is substantially better than traditional Average Current Control skill
Art.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff
Various changes and amendments can be carried out without departing from the scope of the present invention completely.The technical scope of this invention is not
The content being confined on specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (2)
1. a kind of Average Current Control device using capacitor current feedback, it is characterised in that: including the function for Switching Power Supply
Rate circuit and controller, wherein
Power circuit includes sequentially connected input unit, switching device, filter and output device, and input unit is connected to
Switching device is transferred to filter after switching device, and output device is entered after the effect of filter device；
Controller includes voltage check device, reference voltage, Voltage loop error amplifier, inductive current sampling device, electric current loop
Error amplifier, capacitance current sampling apparatus, pulse-width modulator and driving circuit, voltage check device input terminal are connected to
On output device, the output end and reference voltage of voltage check device are separately connected two inputs of Voltage loop error amplifier
End；Inductive current sampling device input terminal and capacitance current sampling apparatus input terminal are connected on filter, and inductive current is adopted
The output end of sampling device and the output end of Voltage loop error amplifier are separately connected two input terminals of electric current loop error amplifier,
The output end of electric current loop error amplifier two that pulse-width modulator is connected with the output end of capacitance current sampling apparatus are defeated
Enter end, the output end connection driving circuit of pulse-width modulator is connected to switching device after driving circuit, for controlling
The input terminal of the conducting and shutdown of switching device, switching device connects input unit.
2. a kind of Average Current Control method using capacitor current feedback, it is characterised in that: the following steps are included:
When the input of Switching Power Supply is connected to input unit, i.e., when Switching Power Supply powers on, voltage check device detection output dress
The output voltage v seto, and the output voltage v that will testoWith reference voltage VrefVoltage loop is generated through Voltage loop error amplifier
Error signal vcon_v；Meanwhile the inductor current signal R of inductive current sampling device acquisition filterSiL；The inductance detected
Current signal RSiLWith Voltage loop error signal vcon_vElectric current loop error signal v is generated through electric current loop error amplifiercon_i；Together
When, capacitance current sampling apparatus acquires the capacitance current signal R of filterCiC；Then, electric current loop error signal vcon_iAnd electricity
Capacitance current signal RCiCDrive pulse signal is generated by pulse-width modulator, through overdrive circuit, control switch device is led
Logical and shutdown.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910311373.3A CN109995234A (en) | 2019-04-18 | 2019-04-18 | Using the Average Current Control device and method of capacitor current feedback |
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| CN201910311373.3A CN109995234A (en) | 2019-04-18 | 2019-04-18 | Using the Average Current Control device and method of capacitor current feedback |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113002303A (en) * | 2019-12-19 | 2021-06-22 | 联合汽车电子有限公司 | Pre-charging circuit and pre-charging method, bidirectional direct current converter and electric automobile |
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| 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 |
| CN108964055A (en) * | 2018-07-27 | 2018-12-07 | 湖南工业大学 | A kind of voltage feed-forward control control method of capacitor current feedback |
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Application publication date: 20190709 |