CN108039818A - Pulse-sequence control device, Switching Power Supply and pulse sequence control method - Google Patents
Pulse-sequence control device, Switching Power Supply and pulse sequence control method Download PDFInfo
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- CN108039818A CN108039818A CN201711405504.1A CN201711405504A CN108039818A CN 108039818 A CN108039818 A CN 108039818A CN 201711405504 A CN201711405504 A CN 201711405504A CN 108039818 A CN108039818 A CN 108039818A
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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
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention provides a kind of pulse-sequence control device, Switching Power Supply and pulse sequence control method, the control device includes partial pressure unit, pulse selection unit, impulse generating unit and driving unit, wherein：The input terminal of the partial pressure unit is connected to the output terminal of the DC voltage converter, and the partial pressure unit includes shunt capacitance；The impulse generating unit, for producing the first control pulse and the second control pulse that frequency is identical, duty cycle is different；The pulse selection unit, for the output voltage according to partial pressure unit, selects the input of the first control pulse or the second control pulse as the driving unit；The driving unit, for being turned on according to input signal driving switch pipe.The present invention corrects the output voltage phase of DC voltage converter by shunt capacitance, it is alternatively that the foundation of the first control pulse or the second control pulse, so as to correct the low-frequency oscillation because caused by output voltage lags inductive current.
Description
Technical field
The present invention relates to field of switch power, more specifically to a kind of pulse-sequence control device, Switching Power Supply and
Pulse sequence control method.
Background technology
With the fast development of Power Electronic Technique and the popularization of portable electric appts, to Switching Power Supply performance and cost
Requirement it is higher and higher.Switching Power Supply generally uses pulse width modulation (Pulse Width Modulation, PWM) controlling party
Case, and above-mentioned PWM control programs need to design suitable error amplifier and its compensation network, add Control System Design
Complexity, constrains the raising of the stabilization and instantaneous performance of Switching Power Supply.
Pulse train (Pulse Train, PT) control program is a kind of novel switched power supply control skill occurred in recent years
Art, it controls pulse and low according to the working condition of Switching Power Supply, in each switch periods initial time from default high power
The effective control signal of selecting switch pipe in Power Control pulse：When switch power source output voltage is less than reference voltage, selection is high
Power Control pulse, so as to increase the energy that converter is absorbed from input terminal, forces output voltage as effective control signal
Rise；Conversely, selection low-power controls pulse as effective control signal, so as to reduce the energy that converter is absorbed from input terminal
Amount, forces output voltage to decline.Relative to PWM control programs, PT control programs be by adjusting two groups of predeterminated frequencies it is identical, account for
The empty adjusting realized than different high and low power pulse combined sequences to output voltage, have circuit realize it is simple, be not required to compensate
The advantages of controlling network, fast response time, suitable for the more demanding switch power supply system of cost performance.
PT control programs are in discontinuous current mode conduction mode (Discontinuous Conduction Mode, DCM)
Switch converters are successfully applied.In dcm mode, each switch periods start/stop time inductive energy storage is zero, conversion
The energy of input is all delivered to output terminal in one switch periods of device.Therefore, output voltage during high power control impulse action
Rise, output voltage declines when low-power controls impulse action.
In order to widen the power bracket of converter, PT control programs can be generalized to continuous current mode conduction mode
In the switch converters (hereinafter referred to as CCM converters) of (Continuous Conduction Mode, CCM), but switch periods
Start/stop time inductive energy storage is no longer equal, and when thus causing the high power pulse to act on, inductive current rises, but cannot be guaranteed output
Voltage rises immediately；Conversely, during low powder pulsed effect, inductive current declines, but cannot be guaranteed that output voltage declines immediately.Cause
, there is the hysteresis quality adjusted using the output voltage of the CCM converters of PT control programs and thus triggered low-frequency oscillation to show in this
As having seriously affected the working performance of switch converters.
For the low-frequency oscillation behavior of the CCM converters using PT control programs, mainly it is unfolded at present in terms of two.One side
The mechanism that face is produced from low-frequency oscillation, by proposing that new control method is inherently eliminated low-frequency oscillation, such as：
(1) controlled using double mode (dual-mode PT/PWM), make to work in pwm pattern during converter stable state,
Ensure the precision of output voltage during converter stable state；PT control models are worked in during transient state, ensure converter transient response performance,
But program control process is complicated.
(2) controlled using valley point current type pulse train (VCM-PT), make the change of inductive energy storage in a switch periods
Amount is zero, has been inherently eliminated the low-frequency oscillation of CCM converters, but also limit CCM inverter power scopes at the same time.
(3) the defects of being directed to VCM-PT control technologies proposes more valley point current type pulse train (MVC-PT) controlling parties
Method, CCM inverter power scopes have been widened by increasing default load current reference value and valley point current quantity, but controller is answered
Miscellaneous, of high cost, poor robustness.
(4) for MVC-PT control technologies there are the problem of propose slide valley point current type pulse train (SVC-PT) control
Method processed, simplifies control circuit and design, has saved circuit cost, avoids excessive preset value to circuit precision and stability
Influence, while improve inverter power scope and realize that minimum ripple exports, but converter design is complex.
On the other hand, by improving control mode or main circuit circuit parameter power oscillation damping behavior, such as：
(1) CCM Buck converters are controlled to pass through conjunction there are low-frequency oscillation for current mode pulse train (CM-PT)
Reason design control parameter limits the bearing power adjustable extent of switch converters to avoid low-frequency oscillation.
(2) capacitance current Pulse skip modulation (CC-PSM) method is used, capacitance current peak value is limited, can be had
Effect suppresses CCM Buck converters in low output filter capacitor equivalent series resistance (Equivalent Series
Resistance, ESR) when low-frequency oscillation behavior, but the method is frequency control, adds the difficulty of filtering.
(3) by increasing ESR values come power oscillation damping, but larger ESR values are by with the output voltage that can not ignore
Ripple and power attenuation.
(4) capacitance current type pulse train (CC-PT) control technology is used, low frequency is suppressed by limiting capacitance current peak
Oscillatory occurences, but as bearing power change pulse combined sequence is constantly changing, so as to cause larger output voltage ripple.
(5) feedback (ICRIF) branch is injected by inductive current ripple information superposition to output terminal by inductive current ripple,
And then solve the hysteresis quality of output voltage adjusting, so that the low-frequency oscillation of CCM converters is inhibited, but due to introducing
ICRIF branches, add complex circuit designs degree.
The content of the invention
The technical problem to be solved in the present invention is, shakes for the above-mentioned CCM converters for using PT to control to eliminate low frequency
Swing and cause the problem of power attenuation is big, circuit is complicated, there is provided a kind of pulse-sequence control device, Switching Power Supply and pulse train
Control method.
The technical solution that the present invention solves above-mentioned technical problem is to provide a kind of pulse-sequence control device, for controlling
The output of DC voltage converter, and the DC voltage converter includes switching tube, the control device include partial pressure unit,
Pulse selection unit, impulse generating unit and driving unit, wherein：The input terminal of the partial pressure unit is connected to the direct current
The output terminal of voltage changer, and the partial pressure unit includes the phase of the output voltage for correcting the DC voltage converter
The shunt capacitance of position；The impulse generating unit, for producing the first control pulse and second that frequency is identical, duty cycle is different
Pulse is controlled, and the duty cycle of the first control pulse is more than the duty cycle of the described second control pulse；The pulse choice
Unit, for the output voltage according to the partial pressure unit, selects the first control pulse or the second control pulse to make
For the input of the driving unit；The driving unit, for driving the switching tube to turn on according to input signal.
In pulse-sequence control device of the present invention, the partial pressure unit further includes first resistor, second resistance,
And the first resistor and second resistance are connected in series in the positive output terminal and negative output terminal of the DC voltage converter
Between；The shunt capacitance is connected in parallel with the first resistor, and the tie point of the first resistor and second resistance is formed
The output terminal of the partial pressure unit.
In pulse-sequence control device of the present invention, the pulse selection unit includes comparator and selection electricity
Road；Wherein：The comparator, for by the output voltage of the partial pressure unit compared with reference voltage, and according to comparing
As a result the selection circuit selection first control pulse or the second control pulse are made as the defeated of the driving unit
Enter.
In pulse-sequence control device of the present invention, the comparator is small in the output voltage of the partial pressure unit
When the reference voltage, make the selection circuit selection the first control pulse as the defeated of the driving unit
Enter；The comparator makes the selection circuit selection institute when the output voltage of the partial pressure unit is more than the reference voltage
State input of the second control pulse as the driving unit.
In pulse-sequence control device of the present invention, the pulse selection unit includes sample circuit, described to take
Sample is electrically connected between the partial pressure unit and the comparator, and the sample circuit is only in the starting of each switch periods
Moment sends the output signal of the partial pressure unit to the comparator.
The present invention also provides a kind of Switching Power Supply, including DC voltage converter, the Switching Power Supply further includes as above institute
The pulse-sequence control device stated.
In Switching Power Supply of the present invention, the DC voltage converter is buck converter.
The present invention also provides a kind of pulse sequence control method, for controlling the output of DC voltage converter, and it is described
DC voltage converter includes switching tube, comprises the following steps：
Produce the first control pulse and the second control pulse that frequency is identical, duty cycle is different, and the first control arteries and veins
The duty cycle of punching is more than the duty cycle of the described second control pulse；
According to the output voltage of the DC voltage converter after shunt capacitance corrects phase, first control is selected
Pulse processed or the second control pulse, the shunt capacitance are located at point for the output terminal for being connected to the DC voltage converter
Press unit；
According to switching tube conducting described in the first control pulse of selection or the second control pulsed drive.
In pulse sequence control method of the present invention, the partial pressure unit, which further includes, is connected in series in the direct current
First resistor and second resistance between the positive output terminal and negative output terminal of voltage changer, and the shunt capacitance and institute
First resistor is stated to be connected in parallel；The output voltage of the DC voltage converter after shunt capacitance corrects phase is the
The voltage of one resistance and the tie point of second resistance.
It is described according to described straight after shunt capacitance corrects phase in pulse sequence control method of the present invention
The output voltage of current-to-voltage converter, selects the first control pulse or the second control pulse to include：
Sample the voltage of the tie point of the first resistor and second resistance；
The voltage obtained will be sampled compared with reference voltage, and be less than or equal to institute in the voltage that the sampling obtains
When stating reference voltage, the first control pulse is selected, when the voltage that the sampling obtains is more than the reference voltage, selection
The second control pulse.
Pulse-sequence control device, Switching Power Supply and the pulse sequence control method of the present invention, by being rectified through shunt capacitance
The output voltage of the DC voltage converter after positive phase, it is alternatively that high power control pulse (the i.e. first control pulse)
With the foundation of low-power control pulse (the i.e. second control pulse), cause so as to correct because output voltage lags inductive current
Low-frequency oscillation.
Brief description of the drawings
Fig. 1 is the schematic diagram of pulse-sequence control device embodiment of the present invention；
Fig. 2 is the circuit topology schematic diagram of pulse-sequence control device embodiment of the present invention；
Fig. 3 is that the circuit topology of the selection circuit embodiment of pulse selection unit in pulse-sequence control device of the present invention shows
It is intended to；
Fig. 4 is the advanced correction curve figure of DC voltage converter output voltage phase；
Fig. 5 (a), (b), (c), (d) are respectively output power when being 5W, use shunt capacitance and use capacitance for
The output voltage phase rail for the DC voltage converter that the shunt capacitance of 0.2uF, 0.3uF, 0.4uF are corrected into line output voltage
Mark；
Fig. 6 (a), (b), (c), (d) are respectively output power when being 10W, use shunt capacitance and use capacitance for
The output voltage phase rail for the DC voltage converter that the shunt capacitance of 0.2uF, 0.3uF, 0.4uF are corrected into line output voltage
Mark；
Fig. 7 is the schematic diagram of pulse sequence control method embodiment of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Figure 1, being the schematic diagram of pulse-sequence control device embodiment of the present invention, which uses
It is above-mentioned in the output voltage control for realizing pulse train control type DC voltage converter (hereinafter referred to as DC voltage converter)
DC voltage converter includes switching tube.The pulse-sequence control device of the present embodiment includes partial pressure unit 1, pulse selection unit
2nd, impulse generating unit 3 and driving unit 4, wherein：The input terminal of partial pressure unit 1 is connected to the output of DC voltage converter
End, and the partial pressure unit 1 includes the shunt capacitance of the phase of the output voltage for correcting DC voltage converter；Pulse generation
Unit 3 can be made of numeral or analog circuit, for producing the first control pulse and the second control that frequency is identical, duty cycle is different
Pulse processed, and the duty cycle of the first control pulse is more than the duty cycle of the described second control pulse；The input of pulse selection unit 2
End is connected to the output terminal of partial pressure unit 1, and according to the first control pulse of the output voltage of partial pressure unit 1 selection or the second control
Input of the pulse as driving unit 4；Driving unit 4 can be specifically made of isolating chip, driving chip and driving power, its is defeated
Outlet is connected to the control terminal of switching tube in DC voltage converter, and the control pulse (first that pulse selection unit is selected
Control pulse or the second control pulse) drive signal with driving switch pipe ability is converted into, to drive DC voltage conversion
The switching tube of device is turned on by setting means, so as to fulfill the output voltage control of DC voltage converter.
Above-mentioned pulse-sequence control device, by increasing shunt capacitance in partial pressure unit 1, can effectively correct direct current
Buckling parallel operation output voltage lags the defects of inductive current, and then suppresses outlet side voltage low-frequency oscillation behavior.And above-mentioned arteries and veins
Rush sequence control device and voltage control is realized based on output voltage ripple, compared to pulse width modulation there is circuit to realize letter
List, be not required to the features such as compensation control network, fast response time.
As shown in Fig. 2, above-mentioned partial pressure unit 1 specifically may include first resistor R1, second resistance R2 and shunt capacitance
Cdi, and first resistor R1 and second resistance R2 are connected in series in DC voltage converter (such as can use buck converter 5)
Positive output terminal+and negative output terminal-between；Shunt capacitance CdiIt is connected in parallel with first resistor R1, and first resistor R1 and
The tie point of two resistance R2 forms the output terminal of partial pressure unit 1.
Above-mentioned buck converter 5 includes switching tube S, inductance L, sustained diode and output filter capacitor C, and above-mentioned
Switching tube S, inductance L and load R are connected in series between the positive and negative anodes of power supply Vin, and output filter capacitor C is then with loading R
It is connected in parallel.
Pulse selection unit 2 specifically may include comparator 21 and selection circuit 22.One input terminal of comparator 21 connects
The output terminal of partial pressure unit 1 is connected to obtain sampled voltage vsampling(i.e. the output voltage of partial pressure unit 1), another input terminal
It is connected to reference voltage Vref, which will produce corresponding output after two input terminal voltages.Selection circuit 22 is then
According to the input of the first control pulse of output selection or the second control pulse of comparator 21 as driving unit 4.
Especially, above-mentioned pulse selection unit 2 may also include sample circuit 23, which is connected to partial pressure unit
Between 1 and comparator 2, and the sample circuit 23 only each switch periods initial time by the output signal of partial pressure unit 1
Comparator 21 (being sampled in the initial time of each switch periods) is sent to, so as to improve control accuracy.
Specifically, can be by d type flip flop DFF and door AN1 and door AN2 and OR gate OR groups with reference to Fig. 3, above-mentioned selection circuit 22
Into its connection mode is：The D ends of d type flip flop DFF are connected with 21 output terminal of comparator, Q ends and an input terminal with door AN1
It is connected, the non-ends of Q are connected with an input terminal with door AN2；With door AN1, AN2 output terminal respectively at OR gate OR input terminal phase
Even；The output terminal of OR gate OR is connected with the input terminal of driving unit 4；The second control pulse P that impulse generating unit 3 exportsLPoint
Do not hold with the clk (Clock, clock signal) of d type flip flop DFF, be connected with another input terminal of door AN2, impulse generating unit 3 is defeated
The the first control pulse P gone outHIt is connected with another input terminal with door AN1.
Above-mentioned pulse-sequence control device, in output voltage (the i.e. sampled voltage of each switch periods sampling partial pressure unit
vsampling), and with reference voltage VrefCompare, work as vsampling≤VrefWhen, first control pulse of the selection of pulse selection unit 2 PH,
The energy that increase DC voltage converter is absorbed from input terminal, forces its output voltage to rise；Conversely, pulse selection unit 2 selects
Select the second control pulse PL, the energy that DC voltage converter is absorbed from input terminal is reduced, forces the reduction of its output voltage.Due to
The energy and the energy of consumption that DC voltage converter inputs in each switch periods are uneven, so as to cause pulse choice list
Member 2 constantly switches between first, second control pulse, and when steady-state operation can form the pulse train circulation of a steady ordered
Cycle.The cycle period is by μHA the first control pulse P with higher-wattageHAnd μLA the second control with lower-wattage
Pulse PLComposition, input energy and output energy reach dynamic equilibrium in pulse cycle, so as to maintain output voltage
It is constant.The mode of the selection control pulse of pulse selection unit 2 can be expressed by following formula：
Wherein DHFor the first control pulse PHDuty cycle, DLFor the second control pulse PLDuty cycle.
Therefore the first of the DC voltage converter of pulse train control controls pulse, the second control pulse and step-up ratio
Relation is as follows
In formula (2), Dav is the average duty ratio for the drive signal that driving unit 4 exports.
When DC voltage converter steady operation, each device bears the separately available following formula of voltage in partial pressure unit 1
(3)-(5) represent, Section 1 represents steady-state component wherein on the right of equal sign, and Section 2 represents transient component：
Wherein v0For the voltage at first resistor R1 and second resistance the R2 both ends of series connection, vCdiFor shunt capacitance CdiBoth ends
Voltage, vR2For the voltage at second resistance R2 both ends.
It can be obtained by Kirchhoff's second law：
vCdi+vR2=vo (6)
Formula (4) both sides are averaged and can be obtained：
VCdi+VR2=Vo (7)
It can be obtained by formula (3)-(7)：
So as to sampled voltage vsampling(i.e. the output voltage of partial pressure unit 1) is：
And tradition does not use shunt capacitance CdiWhen corresponding two divider resistances the voltage of tie point be
Understood according to formula (9) and formula (10), in increase shunt capacitance CdiFront and rear sampled voltage steady-state component is identical, is shown
Voltage stabilizing output can be achieved in DC voltage converter；Compared with formula (10), formula (9) one more,It is shunt capacitance both ends
Transient voltage component, it lags behind the output voltage transient component of DC voltage converterPhase angle be θ (0<θ<90 °),
Therefore,It is ahead of output voltage transient componentPhase angle be θ (0<θ<90°).
Therefore, shunt capacitance C is increaseddiThere is certain phase correction ability to sampled voltage afterwards, can effectively realize to arteries and veins
The low-frequency oscillation for rushing the DC voltage converter of sequence control is suppressed.
, can be based on artificial circuit to the DC voltage converter shown in Fig. 2 in order to verify the correctness of above-mentioned theory analysis
And pulse-sequence control device carries out simulation analysis.Wherein the parameter of counter element is supply voltage vin=15.0V, with reference to electricity
Press Vref=2.5V, the switching frequency f=50.0kHz of DC voltage converter, inductance L=500uH, filter capacitor C=690uF,
The duty cycle D of first control pulseHThe duty cycle D of=0.4, second control pulseL=0.2, resistance R=5.0 Ω and 2.5 Ω,
One resistance R1=100k Ω, second resistance R2=100k Ω, shunt capacitance Cdi=0.2nF, 0.3nF and 0.4nF.
As shown in figure 4, it is the advanced correction curve figure of DC voltage converter output voltage phase.Can from the figure
Go out：(1) the shunt capacitance C of different capacitancesdiLeading phase adjusting can be played, maximum leading phase is about 20 °；(2) with side
Road capacitance CdiCapacitance increase, maximum leading phase angle toward low frequency end move；(3) on the left of maximum leading phase, with side
Road capacitance CdiCapacitance increase, leading phase angle become larger；(4) on the right side of maximum leading phase, with shunt capacitance CdiCapacitance increases
Add, leading phase angle reduces.Therefore, shunt capacitance C is introduced in partial pressure unit 1diTo the sampled voltage of pulse selection unit 2
Phase has advanced correcting.
As Fig. 5 (a) is output power be 5W when, not using shunt capacitance DC voltage converter output voltage phase
Position track；Fig. 5 (b) is output power when being 5W, uses capacitance as 0.2uF shunt capacitances CdiInto the direct current of line output voltage correction
The phase locus of the output voltage of voltage changer；Fig. 5 (c) is output power when being 5W, uses capacitance as 0.3uF shunt capacitances
CdiInto the phase locus of the output voltage of the DC voltage converter of line output voltage correction；Fig. 5 (d) is that output power is 5W
When, capacitance is used as 0.4uF shunt capacitances CdiInto the phase of the output voltage of the DC voltage converter of line output voltage correction
Track.
As Fig. 6 (a) is output power be 10W when, not using shunt capacitance DC voltage converter output voltage
Phase locus；Fig. 6 (b) is output power when being 10W, uses capacitance as 0.2uF shunt capacitances CdiInto line output voltage correction
The phase locus of the output voltage of DC voltage converter；Fig. 6 (c) is output power when being 10W, use capacitance for 0.3uF by
Road capacitance CdiInto the phase locus of the output voltage of the DC voltage converter of line output voltage correction；Fig. 6 (d) is output power
For 10W when, use capacitance as 0.4uF shunt capacitances CdiThe output voltage for the DC voltage converter corrected into line output voltage
Phase locus.
It was found from Fig. 5 (a), 6 (a), not using shunt capacitance DC voltage converter output voltage cannot and
When adjust, generate low-frequency oscillation.Output voltage undulating value is respectively 0.42V, 0.13V；Power device peak-peak electricity
Stream is respectively 1.9A, 2.6A.And employ after shunt capacitance corrects output voltage, the output electricity of DC voltage converter
Press oscillation amplitude very little or there is no low-frequency oscillation.From Fig. 5 (b), 5 (c), 5 (d), load resistance is 5.0 Ω
When, the output voltage undulating value of DC voltage converter is respectively 17mV, 8mV and 7mV, and power device peak inrush current is distinguished
For 1.3A, 1.2A and 1.2A.Similarly, from Fig. 6 (b), 6 (c), 6 (d), when load resistance is 2.5 Ω, direct current buckling
The output voltage undulating value of parallel operation is respectively 24mV, 16mV and 18mV, and power device peak inrush current is respectively 2.3A, 2.2A
And 2.3A.
From above simulation result, tradition does not use the DC voltage converter of shunt capacitance with the increasing of bearing power
Low-frequency oscillation amplitude is added to reduce, but cannot fundamentally power oscillation damping phenomenon；And shunt capacitance is used to output electricity
After pressure correction, DC voltage converter can effectively suppress output voltage low-frequency oscillation behavior, and not as bearing power changes
And change.
The present invention also provides a kind of Switching Power Supply, which includes DC voltage converter and above-mentioned pulse sequence
Row control device.The Switching Power Supply controls output voltage by pulse train, is realized compared to pulse width modulation with circuit
Simply, the features such as being not required to compensation control network, fast response time.DC voltage converter in above-mentioned Switching Power Supply specifically can be
With decompression (Buck) converter.
As shown in fig. 7, the present invention also provides a kind of pulse sequence control method, for controlling the defeated of DC voltage converter
Go out, and above-mentioned DC voltage converter includes switching tube, this method comprises the following steps：
Step S71：Produce the first control pulse and the second control pulse that frequency is identical, duty cycle is different, and above-mentioned the
The duty cycle of one control pulse is more than the duty cycle of the second control pulse.
Step S72：According to the output voltage of the DC voltage converter after shunt capacitance corrects phase, selection the
One control pulse or the second control pulse, above-mentioned shunt capacitance are located at point for the output terminal for being connected to DC voltage converter
Press unit.
Above-mentioned partial pressure unit further include the positive output terminal for being connected in series in DC voltage converter and negative output terminal it
Between first resistor and second resistance, and shunt capacitance is connected in parallel with the first resistor；After shunt capacitance corrects phase
The DC voltage converter output voltage for the tie point of first resistor and second resistance voltage.
The step can specifically select the first control pulse and second to control pulse in the following manner：The electricity of sampling first first
The voltage (can specifically be sampled in the initial time of each switch periods) of the tie point of resistance and second resistance；Then will sampling
The voltage of acquisition selects first compared with reference voltage, and when the voltage that sampling obtains is less than or equal to reference voltage
Pulse is controlled, when the voltage that sampling obtains is more than the reference voltage, selects the second control pulse.
Step S73：Led according to switching tube described in the first control pulse of selection or the second control pulsed drive
It is logical.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
Subject to.
Claims (10)
- A kind of 1. pulse-sequence control device, for controlling the output of DC voltage converter, and the DC voltage converter Including switching tube, it is characterised in that the control device include partial pressure unit, pulse selection unit, impulse generating unit and Driving unit, wherein：The input terminal of the partial pressure unit is connected to the output terminal of the DC voltage converter, and the partial pressure Unit includes being used to correct the shunt capacitance of the phase of the output voltage of the DC voltage converter；The pulse generation list Member, for producing the first control pulse and the second control pulse that frequency is identical, duty cycle is different, and the first control pulse Duty cycle be more than described second control pulse duty cycle；The pulse selection unit, for according to the partial pressure unit Output voltage, selects the input of the first control pulse or the second control pulse as the driving unit；The drive Moving cell, for driving the switching tube to turn on according to input signal.
- 2. pulse-sequence control device according to claim 1, it is characterised in that the partial pressure unit further includes the first electricity Resistance, second resistance, and the first resistor and second resistance are connected in series in the positive output terminal of the DC voltage converter Between negative output terminal；The shunt capacitance is connected in parallel with the first resistor, and the first resistor and second resistance Tie point form the output terminal of the partial pressure unit.
- 3. pulse-sequence control device according to claim 2, it is characterised in that the pulse selection unit includes comparing Device and selection circuit；Wherein：The comparator, for the output voltage of the partial pressure unit to be compared with reference voltage Compared with, and according to comparative result makes the selection circuit selection first control pulse or the second control pulse is used as The input of driving unit.
- 4. pulse-sequence control device according to claim 3, it is characterised in that the comparator is in the partial pressure unit Output voltage when being less than or equal to the reference voltage, make described in the selection circuit selection the first control pulse is used as The input of driving unit；The comparator makes the choosing when the output voltage of the partial pressure unit is more than the reference voltage Select input of circuit selection the second control pulse as the driving unit.
- 5. pulse-sequence control device according to claim 4, it is characterised in that the pulse selection unit includes sampling Circuit, the sample circuit are connected between the partial pressure unit and the comparator, and the sample circuit is only opened each The initial time for closing the cycle sends the output signal of the partial pressure unit to the comparator.
- 6. a kind of Switching Power Supply, including DC voltage converter, it is characterised in that the Switching Power Supply is further included such as claim Pulse-sequence control device any one of 1-5.
- 7. Switching Power Supply according to claim 6, it is characterised in that the DC voltage converter is buck converter.
- A kind of 8. pulse sequence control method, for controlling the output of DC voltage converter, and the DC voltage converter Including switching tube, it is characterised in that the described method comprises the following steps：The the first control pulse and the second control pulse that frequency is identical, duty cycle is different are produced, and described first controls pulse Duty cycle is more than the duty cycle of the described second control pulse；According to the output voltage of the DC voltage converter after shunt capacitance corrects phase, the first control arteries and veins is selected Punching or the second control pulse, the shunt capacitance are located at the partial pressure list for the output terminal for being connected to the DC voltage converter Member；According to switching tube conducting described in the first control pulse of selection or the second control pulsed drive.
- 9. pulse sequence control method according to claim 8, it is characterised in that the partial pressure unit further includes series connection and connects The first resistor and second resistance being connected between the positive output terminal of the DC voltage converter and negative output terminal, and it is described Shunt capacitance is connected in parallel with the first resistor；The DC voltage converter after shunt capacitance corrects phase Output voltage is first resistor and the voltage of the tie point of second resistance.
- 10. pulse sequence control method according to claim 9, it is characterised in that described to be corrected according to through shunt capacitance The output voltage of the DC voltage converter after phase, selects the first control pulse or the second control pulse bag Include：Sample the voltage of the tie point of the first resistor and second resistance；The voltage obtained will be sampled compared with reference voltage, and be less than or equal to the ginseng in the voltage that the sampling obtains When examining voltage, the first control pulse is selected, when the voltage that the sampling obtains is more than the reference voltage, described in selection Second control pulse.
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| CN112290793A (en) * | 2020-10-20 | 2021-01-29 | 中国矿业大学 | Pulse sequence control DC-DC conversion device suitable for micro-grid |
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