CN109768703A - A kind of frequency conversion Average Current Control device and method based on output voltage feedback - Google Patents

A kind of frequency conversion Average Current Control device and method based on output voltage feedback Download PDF

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Publication number
CN109768703A
CN109768703A CN201910170199.5A CN201910170199A CN109768703A CN 109768703 A CN109768703 A CN 109768703A CN 201910170199 A CN201910170199 A CN 201910170199A CN 109768703 A CN109768703 A CN 109768703A
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voltage
output
loop error
electric current
current
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CN109768703B (en
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张希
包伯成
吴靖
吴志敏
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Changzhou University
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Changzhou University
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Abstract

The present invention provides a kind of frequency conversion Average Current Control device and method based on output voltage 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, electric current loop error signal and the output voltage of detection are through conversion modulator, drive pulse signal is generated, adjusts output voltage and output electric current using driving circuit control switch device.It is characterized in that increasing an output voltage control loop on the basis of traditional Average Current Control.The invention outstanding advantages are: compared with traditional average ionization ratio, the present invention improves the current transient response speed and light-load efficiency of Switching Power Supply.

Description

A kind of frequency conversion Average Current Control device and method based on output voltage feedback
Technical field
The present invention relates to switch power supply equipment technical fields, flat more particularly to a kind of frequency conversion based on output voltage feedback Equal current control device and method.
Background technique
With the fast development of electronic information technology, various electronic products have obtained extensively in people's lives, production Use.Normal, the efficient operation of these electronic products be unable to do without reliable power supply.Relative to conventional linear power supply, switch electricity Source is small in size, light-weight and high-efficient because having the characteristics that, has obtained the very big concern of academia and engineering circles, and become electricity A branch the most active in power electronic field.However, the function with electronic product is stronger and stronger, to Switching Power Supply Working performance, especially mapping proposes 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 switching power converter topology, using different control methods pair The stable state accuracy of system and dynamic property etc. generate different influences.For given application, switching power converter Topological 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 switching power converter control method, has current control essence The advantages that degree height, strong antijamming capability, therefore be applied in various electronic products.However, based on traditional Average Current Control Switching power converter mapping it is poor.Further, since switching frequency is fixed, when switching power converter works light When load, the specific gravity of total losses shared by switching loss is larger, causes underloading power lower.Therefore, it is necessary to traditional average current Control technology improves.
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 a kind of base In the frequency conversion Average Current Control device and method of output voltage feedback, the transient response speed of traditional Average Current Control is improved Degree and light-load efficiency.
The present invention solves its technical problem technical solution to be taken: a kind of frequency conversion based on output voltage feedback is flat Equal current 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, current sampling device, electric current loop Error amplifier, conversion modulator and driving circuit, voltage check device input terminal connect on an output device, voltage detecting dress The output end and reference voltage set are separately connected two input terminals of Voltage loop error amplifier;Current sampling device input terminal connects It connects on filter, the output end of current sampling device and the output end of Voltage loop error amplifier are separately connected electric current loop mistake Two input terminals of poor amplifier, the output end of electric current loop error amplifier connect frequency conversion tune with the output end of voltage check device The output end connection driving circuit of device processed, conversion modulator is connected to switching device after driving circuit, is used for control switch The input terminal of the conducting and shutdown of device, 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;Current detection means detects electric current, and the voltage error signal provided with Voltage loop is missed by electric current loop Poor amplifier carries out error amplification, obtains electric current loop error signal signal;Electric current loop error signal and voltage check device detect Output voltage by conversion modulator, generate drive pulse signal, drive pulse signal controls main circuit by driving circuit Work.
A kind of frequency conversion Average Current Control method based on output voltage feedback, including foregoing circuit, further include following step It is rapid:
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 current signal R of current sampling device acquisition filterSiL, and The current signal R that will testSiLWith Voltage loop error signal vcon_vIt is acted on through electric current loop error amplifier and generates electric current loop mistake Difference signal vcon_i;Then, electric current loop error signal vcon_iDrive pulse signal is generated by conversion modulator with output voltage, Through overdrive circuit, the conducting and shutdown of control switch device, thus the output voltage of regulating switch power inverter and output Electric current.
When output voltage is less than electric current loop error signal, conversion modulator exports and keeps high level signal, by driving Dynamic circuit, conducting power switch pipe;Conversely, conversion modulator exports and keeps low level signal, switch-off power switching 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 and light-load efficiency when electric current loop error signal mutates.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
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 electric current loop error signal positive transition When time-domain-simulation waveform diagram;Wherein, (a) electric current loop error signal waveform;(b) traditional Average Current Control Buck converter Inductive current waveform;(c) the inductive current waveform of the method for the present invention control Buck converter.
Fig. 4 is that the Buck converter of the embodiment of the present invention and traditional Average Current Control bears jump in electric current loop error signal When time-domain-simulation waveform diagram;Wherein, (d) electric current loop error signal waveform;(e) traditional Average Current Control Buck converter Inductive current waveform;(f) the inductive current waveform of the method for the present invention control Buck converter.
Fig. 5 be the Buck converter of the embodiment of the present invention and traditional Average Current Control with load reduction when time-domain-simulation Waveform diagram, wherein the inductive current waveform and load current waveform of the Buck converter of (a) tradition Average Current Control;(b) it passes The drive pulse signal waveform of the Buck converter for Average Current Control of uniting;(c) the Buck converter of the method for the present invention control Inductive current waveform and load current waveform;(d) the drive pulse signal waveform of the Buck converter of the method for the present invention control.
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, current sampling device, 9, electric current loop error amplifier, 10, conversion modulator, 11, 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 frequency conversion Average Current Control device based on output voltage feedback of the invention, outside dotted line frame For power circuit, comprising: input unit 1, switching device 2, filter 3 and output device 4;Connection relationship: input unit 1 connects It is connected to switching device 2, filter 3 is transferred to after switching device 2, output dress is entered after the effect of filter device 3 Set 4.
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, electric current Sampling apparatus 8, electric current loop error amplifier 9, conversion modulator 10 and driving circuit 11;Connection relationship: it is connected in output 4 Voltage check device 5 and reference voltage 6 are separately connected two input terminals of Voltage loop error amplifier 7;It is connected to filter 3 On current sampling device 8 and Voltage loop error amplifier 7 output end be separately connected two of electric current loop error amplifier 9 it is defeated Enter end, the output end of electric current loop error amplifier 9 connects conversion modulator 10, frequency conversion tune with the output end of voltage check device 5 The output end of device 10 processed connects driving circuit 11, conducting and shutdown after driving circuit 11, 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;Current sampling device 8 can be realized using the differential amplifier circuit built by operational amplifier;Electric current Ring error amplifier 9 can be using the integrator or PI compensator built by operational amplifier;Conversion modulator 10 can by than It is constituted compared with device, conducting timer and rest-set flip-flop;Driving circuit 11 can be using 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;Using the differential amplifier circuit built by operational amplifier as current sampling device 8;Using The integrator built by operational amplifier is as electric current loop error amplifier 9;It is triggered using by comparator, conducting timer and RS The conversion modulator that device is constituted is as conversion modulator 10;Using integrated drive chips as driving circuit 11, 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 current detection means will be examined The current signal R measuredSiLWith Voltage loop error signal vcon_vElectric current loop error signal is generated through electric current loop error amplifier vcon_i.Then, electric current loop error signal and output voltage are compared by conversion modulator, output driving pulse signal.When Output voltage voLess than electric current loop error signal vcon_iWhen, conversion modulator exports and keeps high level, is that power switch tube is led It is logical;Conversely, conversion modulator exports and keep low level, turn off power switch tube, so that regulating switch power inverter is steady Fixed work.
Analysis of simulation result:
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, fixed turn-on time TON=3.3 μ s, sawtooth period T=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.
Fig. 5 is that converter works in DCM, that is, is worked in light condition, traditional Average Current Control and side of the present invention The simulation waveform that the Buck converter of method control reduces with load current, in addition to loading R=16 Ω, other simulated conditions phases Together.Fig. 5 component (a), (b), (c), (d) respectively correspond inductive current and the load of the Buck converter of traditional Average Current Control The Buck converter that electric current, the drive pulse signal of the Buck converter of traditional Average Current Control, the method for the present invention control The drive pulse signal for the Buck converter that inductive current and load current, the method for the present invention control.Component (a), (b), (c) and (d) horizontal axis is time (ms), and the longitudinal axis of (a) and (c) is that the longitudinal axis of electric current (A), (b) and (d) is drive pulse signal electricity It presses (V).In Fig. 5, load current drops to 0.0125A from 0.3125A, from component (a) and (b) as can be seen that in light condition Under, the switch periods of the Buck converter of traditional Average Current Control are not influenced by load current variation;From component (c) and (d) as can be seen that under light condition, switch periods the subtracting with load current of the Buck converter of the method for the present invention control Small and increase, thus the switching loss under reducing light condition.Due in light condition, converter function shared by switching loss The specific gravity of rate loss is larger, and the power loss of converter can be reduced by reducing switching loss, to improve light-load efficiency.Thus may be used See, relative to traditional Average Current Control technology, the method for the present invention can effectively improve the light-load efficiency of switching power converter.
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 frequency conversion Average Current Control device based on output voltage feedback, it is characterised in that: including being used for Switching Power Supply Power 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, current sampling device, electric current loop error Amplifier, conversion modulator and driving circuit, voltage check device input terminal connect on an output device, voltage check device Output end and reference voltage are separately connected two input terminals of Voltage loop error amplifier;Current sampling device input terminal is connected to On filter, the output end of current sampling device and the output end of Voltage loop error amplifier are separately connected electric current loop error and put Two input terminals of big device, the output end of electric current loop error amplifier connect conversion modulator with the output end of voltage check device Two input terminals, conversion modulator output end connection driving circuit be connected to switching device after driving circuit, be used for The input terminal of the conducting and shutdown of control switch device, switching device connects input unit.
2. a kind of frequency conversion Average Current Control method based on output voltage 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 current signal R of current sampling device acquisition filterSiL;The current signal R detectedSiL With Voltage loop error signal vcon_vElectric current loop error signal v is generated through electric current loop error amplifiercon_i;Then, electric current loop error Signal vcon_iWith output voltage voDrive pulse signal is generated by conversion modulator, through overdrive circuit, control switch device Turn-on and turn-off.
CN201910170199.5A 2019-03-07 2019-03-07 Variable-frequency average current control device and method based on output voltage feedback Active CN109768703B (en)

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CN111722073A (en) * 2020-06-01 2020-09-29 上海交通大学 MMC sub-module capacitor ESR value online monitoring method and device
CN111799989A (en) * 2020-07-15 2020-10-20 电子科技大学 Overcurrent detection circuit applied to current mode COT control Buck converter

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CN111799989A (en) * 2020-07-15 2020-10-20 电子科技大学 Overcurrent detection circuit applied to current mode COT control Buck converter
CN111799989B (en) * 2020-07-15 2021-06-08 电子科技大学 Overcurrent detection circuit applied to current mode COT control Buck converter

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