CN205811853U - A kind of switch converters non-linear modulation voltage mode control device - Google Patents
A kind of switch converters non-linear modulation voltage mode control device Download PDFInfo
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- CN205811853U CN205811853U CN201620721608.8U CN201620721608U CN205811853U CN 205811853 U CN205811853 U CN 205811853U CN 201620721608 U CN201620721608 U CN 201620721608U CN 205811853 U CN205811853 U CN 205811853U
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Abstract
The utility model discloses a kind of switch converters non-linear modulation voltage mode control device, by detection input voltage and output voltage, carrier signal in non-linear modulation circuit and control signal are carried out computing and conversion, produce pulse signal, thus control the turn-on and turn-off of converter switches pipe.This utility model is applicable to Buck changer, Boost, Buck Boost, Buck2The switch converters such as changer, forward converter, anti exciting converter.With one circle control, peak value comparison method and V2The switch converters controlled is compared, and the advantage using switch converters of the present utility model is: simple in construction, and steady-state behaviour is good, and input transient response and load transient response speed are fast etc..
Description
Technical field
This utility model relates to power electronic equipment, the control method of a kind of switch converters and device thereof.
Background technology
In recent years, power electronic devices technology and electric electronic current change technology development, as the important neck of power electronics
The switch power technology in territory becomes application and the focus of research.Increasing application scenario requires that switch converters has faster
Input response speed, load response speed and stable state accuracy, such as: the power supply of microprocessor and power-supply management system.Cause
This, improve input response speed, load response speed and stable state accuracy and more and more paid close attention to by academia and industrial quarters.Pin
To same switch converters, use different control methods that changer can be made to have different transient states and steady-state behaviour.
Control based on pulse width modulation (pulse width modulation, PWM) is that most commonly seen switch becomes
Parallel operation control method, such as traditional voltage mode control, peak value comparison method and Average Current Control etc..Above-mentioned based on PWM technology
Conventional voltage type control core thought be: the output voltage of switch transformer is obtained error with reference voltage after comparing
Signal, then error signal is generated after error amplifier compensates modulated signal, and by modulated signal and fixed frequency and amplitude
Sawtooth waveforms compare acquisition pulse signal, pulse signal controls the turn-on and turn-off of switching tube after driver.Traditional
Although voltage mode control simple in construction, but the input response speed of its control system and load response speed are slower.
Pulse frequency modulated (pulse frequency modulation, PFM) technology is a kind of raising changer transient state
The method of response speed, but its control system is complex, steady-state behaviour is poor.Additionally, control technology based on PFM belongs to change
Frequency controls, and switching frequency changes with circuit parameter and changes, and there is the problems such as filter network design complexity.
Utility model content
The purpose of this utility model is to provide a kind of switch converters non-linear modulation voltage mode control device, and is allowed to
There is input response speed and load response speed, higher stable state accuracy, and simple in construction faster, it is adaptable to multiple open up
Flutter the changer of structure.
This utility model realizes its utility model purpose and be the technical scheme is that a kind of non-linear tune of switch converters
Voltage mode control device processed, mainly by the first voltage detecting circuit VS1, the second voltage detecting circuit VS2, error amplifier EA,
Triangular wave generator TSG, non-linear modulation circuit MCC and drive circuit DR composition；Testing circuit VS1 and VS2 and power circuit
TD is connected, and the outfan of the first voltage detecting circuit VS1 is connected with error amplifier EA input；The output of error amplifier EA
End, the outfan of the first voltage detecting circuit VS1, the outfan of the second voltage detecting circuit VS2 and triangular wave generator TSG's
Outfan is connected with four inputs of non-linear modulation circuit MCC respectively；Non-linear modulation circuit MCC outfan and driving electricity
The input of road DR is connected, and the outfan of drive circuit DR is connected with power circuit TD.
Further, described non-linear modulation circuit MCC is made up of, specifically non-linear arithmetic circuit NC and comparator CMP
Composition form is: signal Vin、Vsaw、VOSAnd VeIt is connected with four inputs of non-linear arithmetic circuit NC, non-linear arithmetic circuit
The signal V of NC outputSAnd VCBeing connected with two inputs of comparator CMP, the output end signal of comparator CMP is control letter
Number VP。
As above the switch converters non-linear modulation voltage mode control method of device is such that by detection output voltage
Value, obtains signal VOS；By detection input voltage value, obtain signal Vin；By VOSWith voltage reference value VrefFeeding error is amplified
Device produces signal Ve；Carrier signal V is generated by triangular wave generatorsaw；By VOS、Vin、VeAnd VsawFeeding non-linear modulation electricity
Road generates signal VP, control the turn-on and turn-off of converter switches pipe.
Compared with prior art, the beneficial effects of the utility model are:
One, compared with existing peak value comparison method switch converters, use switch converters of the present utility model defeated
When entering voltage jump, transient response speed is faster；And use switch converters of the present utility model in the dutycycle controlling pulse
Time bigger, subharmonic oscillation phenomenon will not be produced.
Two, compared with existing one circle control switch converters, use switch converters of the present utility model in input
When voltage or load jump, transient response speed is faster；When the dutycycle that switch converters controls pulse is bigger, use this
The switch converters of utility model will not produce reducing frequency phenomenon.
Three and existing V2Control switch converters to compare, use switch converters of the present utility model at load jump
Time, transient response speed is faster；And output capacitance equivalent series resistance (the Equivalent Series when switch converters
Resistance, ESR) value less time, do not have wild effect.
With detailed description of the invention, this utility model is described in further detail below in conjunction with the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present utility model.
Fig. 2 is the schematic diagram of the non-linear arithmetic circuit NC of this utility model embodiment one.
Fig. 3 is the schematic block circuit diagram of this utility model embodiment one.
Control signal V when Fig. 4 is input voltage saltus step in this utility model embodiment oneC, carrier signal VSAnd signal VP
Between relation schematic diagram.Wherein, (a) is this utility model embodiment one control signal VC, carrier wave when input voltage reduces
Relation schematic diagram between signal VS and signal VP；B () is that this utility model embodiment one controls when input voltage increases
Relation schematic diagram between signal VC, carrier signal VS and signal VP.
Control signal V when Fig. 5 is load jump in this utility model embodiment oneC, carrier signal VSAnd signal VPBetween
Relation schematic diagram.Wherein, (a) control signal VC that is this utility model embodiment one when load reduces, carrier signal VS with
And the relation schematic diagram between signal VP；B () is this utility model embodiment one control signal VC, carrier wave letter when load increases
Relation schematic diagram number between VS and signal VP.
Fig. 6 is that this utility model embodiment one Buck changer with peak value comparison method and one circle control is at input electricity
The time-domain-simulation comparison of wave shape figure of output voltage during pressure saltus step.Wherein, (a) be this utility model embodiment one input voltage by
30V step is to the time-domain-simulation comparison of wave shape figure of output voltage during 25V；B () is that this utility model embodiment one is at input voltage
By the time-domain-simulation comparison of wave shape figure of output voltage during 30V step to 35V.
Fig. 7 is this utility model embodiment one and one circle control and V2The Buck changer controlled is defeated when load jump
Go out the time-domain-simulation comparison of wave shape figure of voltage.Wherein, (a) is that this utility model embodiment one is when load is by 1A step to 0.5A
The time-domain-simulation comparison of wave shape figure of output voltage；B () is that this utility model embodiment one is defeated when load is by 1A step to 1.5A
Go out the time-domain-simulation comparison of wave shape figure of voltage.
Fig. 8 is this utility model embodiment one and peak value comparison method, one circle control and V2The Buck changer controlled
The stable state time-domain-simulation comparison of wave shape figure of output voltage.Wherein, (a) is this utility model embodiment one and peak value comparison method
Buck changer stable state time-domain-simulation comparison of wave shape figure of output voltage when input voltage is 15V with one circle control；(b)
For this utility model embodiment one and V2The Buck changer stable state time-domain-simulation ripple of output voltage when ESR=5m Ω controlled
Shape comparison diagram.
Fig. 9 is the schematic diagram of the non-linear arithmetic circuit NC of this utility model embodiment two.
Figure 10 is the schematic block circuit diagram of this utility model embodiment two.
Detailed description of the invention:
As it is shown in figure 1, this utility model mainly comprises by power circuit TD, the first voltage detecting circuit VS1, the second voltage
Testing circuit VS2, error amplifier EA, triangular wave generator TSG, non-linear modulation circuit MCC and drive circuit DR composition.The
The outfan of one voltage detecting circuit VS1 is connected with the input of error amplifier EA；The outfan of error amplifier EA, first
The outfan of voltage detecting circuit VS1, the outfan of the second voltage detecting circuit VS2 and the outfan of triangular wave generator TSG
It is connected with four inputs of non-linear modulation circuit MCC respectively；The outfan of MCC is connected with the input of drive circuit DR,
The outfan of drive circuit DR is connected with power circuit TD.
Embodiment one:
Non-linear modulation circuit MCC described in the utility model is made up of non-linear arithmetic circuit NC and comparator CMP, tool
Body composition form is: signal Vin、Vsaw、VOSAnd VeIt is connected with four inputs of non-linear arithmetic circuit NC, nonlinear operation electricity
The signal V of road NC outputSAnd VCBeing connected with two inputs of comparator CMP, the output end signal of comparator CMP is control
Signal VP.As in figure 2 it is shown, non-linear arithmetic circuit NC is made up of the first multiplier MUXA and the second multiplier MUXB, concrete group
One-tenth form is: detection signal VinWith triangular signal VsawIt is connected with two inputs of the first multiplier MUXA, the first multiplier
The outfan of MUXA is signal VS, detect signal VOSWith error signal VeTwo input phases with the second multiplier MUXB
Even, the outfan of the second multiplier MUXB is signal VC。
TD is as a example by Buck changer, and the schematic block circuit diagram of this utility model embodiment one is as shown in Figure 3.
Operation principle of the present utility model is: in each switch periods, and the first voltage detecting circuit VS1 is used for detecting
The output voltage of Buck changer obtains signal VOS；By VOSWith voltage reference value VrefSend into error amplifier EA and produce signal Ve,
Second voltage detecting circuit VS2 obtains signal V for the input voltage detecting Buck changerin, triangular wave generator TSG is used for
Produce signal Vsaw.First multiplier MUXA is by signal VinWith signal VsawBe multiplied generation carrier signal VS；Second multiplier MUXB
By signal VeWith signal VOSBe multiplied generation control signal VC；Control signal VCWith comparator CMP "+" be connected, carrier signal VSWith
The "-" of comparator CMP is connected, control signal VCWith carrier signal VSMake comparisons generation signal VP, signal VPVia drive circuit DR
Control the turn-on and turn-off of Buck converter switches pipe.In Fig. 4, control signal when (a) and (b) is input voltage reduction and increase
VC, carrier signal VSAnd signal VPBetween relation schematic diagram；In Fig. 5, (a) and (b) controls letter when reducing for load and increase
Number VC, carrier signal VSAnd signal VPBetween relation schematic diagram.
With PSIM simulation software, method of the present utility model being carried out time-domain-simulation analysis, result is as follows:
Fig. 6 is that the Buck changer using this utility model and one circle control, peak value comparison method is jumped at input voltage
The time-domain-simulation oscillogram of output voltage during change, figure (a) reduces with (b) corresponding input voltage respectively and input voltage increases.Figure
In (a), the input voltage V when 10msinBy 30V step to 25V, the Buck using one circle control and peak current mode to control becomes
Parallel operation enters stable state respectively through about 1.31ms and 1.66ms, and uses the Buck changer of this utility model control method to pass through
About 100 μ s enter stable state.In figure (b), the input voltage V when 20msinBy 30V step to 35V, use one circle control and peak value
The Buck changer that electric current controls enters stable state respectively through about 1.24ms and 1.63ms, and uses this utility model control method
Buck changer through about 100 μ s enter stable states.From figure (a) and (b) it can be seen that output voltage V of the present utility modelO's
Overshoot is less than one circle control and the Buck changer output voltage V of peak value comparison methodOOvershoot.As fully visible, adopt
With Buck changer of the present utility model at input voltage VinOutput voltage V during sudden changeOOvershoot little, regulating time is short, surely
State property can be good.The simulation parameter of Fig. 6 is: input voltage Vin=30V, inductance L=250 μ H, voltage reference value Vref=10V, output
Electric capacity C=470 μ F, output capacitance ESR=50m Ω, load R=10 Ω, and switching frequency is 50kHz, the ratio in error amplifier
Example FACTOR P=1, timeconstantτi=0.0005s.
Fig. 7 is for using this utility model and V2Control, the Buck changer of one circle control exports electricity when load jump
The time-domain-simulation comparison of wave shape figure of pressure, figure (a) load the most corresponding with (b) reduces and load increases.In figure (a), when 10ms
Output electric current IOBy 1A step to 0.5A, use V2Control and the Buck changer of one circle control respectively through about 220us and
260us enters stable state, and uses the Buck changer of this utility model control method to enter stable state through about 50 μ s.In figure (b),
Electric current I is exported when 20msOBy 1A step to 1.5A, use V2Control the Buck changer with one circle control respectively through about
260us and 280us enters stable state, and uses the Buck changer of this utility model control method to enter stable state through about 50 μ s.
From figure (a) and (b) it can also be seen that output voltage V of the present utility modelOOvershoot less than V2Control and one circle control
Buck changer output voltage VOOvershoot.As fully visible, use Buck changer of the present utility model when load changing
Output voltage VOOvershoot little, regulating time is short, and stable state accuracy is high.The simulation parameter of Fig. 7 is: input voltage Vin=25V, electricity
Sense L=250 μ H, voltage reference value Vref=10V, output capacitance C=470 μ F, output capacitance ESR=50m Ω, load R=10
Ω, switching frequency is 50kHz, the proportionality coefficient P=15 in error amplifier, timeconstantτi=0.0005s.
Fig. 8 is this utility model embodiment one and one circle control, peak value comparison method and V2The Buck changer controlled
The stable state time-domain-simulation comparison of wave shape figure of output voltage.In figure (a), as input voltage VinFor 15V, due to the control of switching tube
Pulse duration is bigger, and the Buck changer of peak value comparison method produces subharmonic oscillation phenomenon, and the Buck of one circle control becomes
Parallel operation produces reducing frequency phenomenon；Use Buck changer of the present utility model will not produce wild effect.In figure (b), work as output
Electric capacity ESR=5m Ω, with V2The Buck changer controlled is compared, and uses Buck changer of the present utility model not have shakiness
Determine phenomenon.
Embodiment two:
Embodiment is basically identical with the principle of embodiment one, and difference is: as it is shown in figure 9, nonlinear operation is electric
Road NC is made up of the 3rd multiplier MUXC and divider DIV, and particular make-up form is: signal VOSWith signal VeWith the 3rd multiplier
Two inputs of MUXC are connected, and the outfan of the 3rd multiplier MUXC is as the end that removes of divider DIV, detection signal VinAs
Divider DIV is removed end, and the outfan of divider DIV is signal VC, triangular signal VsawIt is signal VS, circuit theory
Block diagram is as shown in Figure 10.
Claims (2)
1. a switch converters non-linear modulation voltage mode control device, it is characterised in that mainly by the first voltage detecting electricity
Road VS1, the second voltage detecting circuit VS2, error amplifier EA, triangular wave generator TSG, non-linear modulation circuit MCC and drive
Galvanic electricity road DR forms；Testing circuit VS1 with VS2 is connected with power circuit TD, the outfan of the first voltage detecting circuit VS1 and mistake
Difference amplifier EA input is connected；The outfan of error amplifier EA, the outfan of the first voltage detecting circuit VS1, the second electricity
The outfan of pressure testing circuit VS2 and the outfan of triangular wave generator TSG are defeated with four of non-linear modulation circuit MCC respectively
Enter end to be connected；Non-linear modulation circuit MCC outfan is connected with the input of drive circuit DR, the outfan of drive circuit DR with
Power circuit TD is connected.
Switch converters non-linear modulation voltage mode control device the most according to claim 1, it is characterised in that: described non-
Linear modulation circuit MCC is made up of non-linear arithmetic circuit NC and comparator CMP, and particular make-up form is: signal Vin、Vsaw、
VOSAnd VeIt is connected with four inputs of non-linear arithmetic circuit NC, the signal V of non-linear arithmetic circuit NC outputSAnd VCWith than
Two inputs of relatively device CMP are connected, and the output end signal of comparator CMP is control signal VP。
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| CN106067733A (en) * | 2016-07-08 | 2016-11-02 | 西南交通大学 | A kind of switch converters non-linear modulation voltage mode control device and method |
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