CN106452042B - Suitable for analog control system downconverter SS (soft start) control circuit and control method - Google Patents
Suitable for analog control system downconverter SS (soft start) control circuit and control method Download PDFInfo
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- CN106452042B CN106452042B CN201611014994.8A CN201611014994A CN106452042B CN 106452042 B CN106452042 B CN 106452042B CN 201611014994 A CN201611014994 A CN 201611014994A CN 106452042 B CN106452042 B CN 106452042B
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
Abstract
The invention discloses analog control system downconverter SS (soft start) control circuit and control method is suitable for, synchronous rectification Buck converter is a kind of common bidirectional DC-DC converter circuit topology, and the two-way flow of energy may be implemented in it.Battery charging and discharging occasion, the soft start-up scheme being slowly unfolded using traditional duty ratio or after start completion inductive current in specified steady operation when being lightly loaded discontinuous mode, biggish starting current spike can be brought.The present invention is by utilizing the existing closed loop PID regulator of converter, and making duty ratio, closed loop is preset at given duty ratio before activation.Starting moment avoids big rush of current with preset duty ratio closed-loop start-up, while the quick dynamic response of start-up course may be implemented, to accelerate start-up course.Rush of current when starting can be significantly reduced in the present invention, can also be compatible with the application of the multiplex cut phase starting control suitable for cell load, voltage-source type load, resistive load and converter.
Description
Technical field
The present invention relates to analog control system downconverter SS (soft start) control circuit and control method is suitable for, belong to electric power
Electronic converter technical field.
Background technique
Synchronous rectification Bi-directional Buck converter applied to battery charging and discharging occasion is a kind of common topology, is in tradition
On the basis of Buck converter, rectifier diode is changed into synchronous rectifier, can reduce the loss of diode drop bring, also
The two-way flow of energy may be implemented simultaneously.Converter output terminal is cell type load, compared to traditional resistive load, is had
Following feature and difference: 1. when converter starts, and the output end voltage of resistive load is zero, and cell type load end is existing
For cell voltage as support, output voltage is simultaneously non-zero；2. in the Bi-directional Buck converter of synchronous rectification, the energy of converter
With two-way flow, ohmic load is dissipativeness load, and cell load is energy storage load, and cell load can be used as power supply
To input side feedback energy.Therefore, features described above, the soft start based on the synchronous rectification Buck converter under cell load are compared
There is larger difference compared to resistive load.On the other hand, the power management scheme of power inverter usually may be selected digital control
System and analog controller part and system two ways.Control algolithm is neatly realized relative to based on digital control chip
And soft-start method, analog controller part, the control achievable control method of chip are limited to by the characteristic of device itself, but made
It is still widely used for the higher controller of cost performance in various power management occasions.In the applied field based on numerical control system
It closes, analog controller part is still the part that can not lack in system.Synchronous rectification currently based on analog controller part is two-way
The soft start-up scheme of Buck converter mainly include the following types:
(1) main switch driving duty ratio, which is started from scratch, becomes larger to steady-state value, and synchronous rectifier is driven to be responsible for
Complementation；
This method be resistive type load under common soft start-up scheme, when apply cell type load under, auxiliary switch
Pipe has compared with big space rate on startup, and the energy of battery side can make inductance be quickly reversed saturation by synchronous rectifier, reversely
Rush of current is very big to burn switching device.
(2) main switch driving duty ratio, which is started from scratch, becomes larger to steady-state value, and the driving of synchronous rectifier is temporarily sealed
It closes, complementary output after delay；
This method can be applied under cell type load or resistive load, auxiliary tube reverse impact electricity when solving starting
Flow larger problem.But this method applies the validity under cell type load to have certain condition.When light load,
Inductive current enters discontinuous mode, and input and output no longer meet Vin=DVoRelationship, wherein D be supervisor duty ratio, VinIt is defeated
Enter Source side voltage, VoFor battery side voltage.The main switch duty ratio very little of complementary output is driven after synchronous rectifier delay
When, it may appear that and situation identical in method (1).Therefore this method is not suitable for being started in the case where load is smaller.In addition, entire
Start-up course needs to increase constant time lag, reduces dynamic response performance when system starting.
(3) main switch driving duty ratio, which is started from scratch, becomes larger to steady-state value, and the driving of synchronous rectifier is also from zero
It is complementary with supervisor when starting to become larger to stable state；
This method can be adapted for cell type load and resistive load.Since auxiliary tube also uses after complementation again from zero
The duty ratio of the drive form of expansion, synchronous rectifier can start from scratch, possible under discontinuous mode described in method (2)
Rush of current can be suppressed.But the starting time that this method needs is longer, is needed in realization using delay circuit, it is same to drop
Dynamic response performance when low system starting.The size of inrush current and the bandwidth of control loop also have certain relationship.
In other some typical cases, converter soft start also plays important role.Such as in multiplex
In Buck converter applications, generally for the efficiency for improving underloading, number of phases dynamic can be used and control.Converter when overloaded,
All phases are devoted oneself to work；When converter load lightens, do not work partially mutually shielding.This will reduce converter at light load
Switching loss improves the efficiency of complete machine.When converter load become weight when, the phase or several phases newly to put into operation need to its into
The control of row soft start.New investment mutually be incorporated to it is original worked be in parallel work when, exist identical as under the conditions of cell load
Problem.Since voltage has been established in converter two sides, new investment mutually need and the fashionable starting current spike for inhibiting moment in parallel.
And since the variation of load is that in real time, therefore, it is desirable to newly put into, mutually in soft start, dynamic response can be sufficiently fast, avoid
Load becomes again to the excessive bring pressure of the instantaneous power of original work phase.Therefore, under these application backgrounds, quickly dynamic is rung
It answers, the meaning of the converter soft start-up scheme of low inrush current becomes particularly significant.
Summary of the invention
It is suitable for analog control system downconverter soft starting control electric the technical problems to be solved by the present invention are: providing
Road and control method reduce the current start impact under cell type load.
The present invention uses following technical scheme to solve above-mentioned technical problem:
Suitable for analog control system downconverter SS (soft start) control circuit, including duty ratio reference generating circuit, simulation
Gating switch, PID error compensation network, duty ratio generator, duty ratio low-pass filter, first and door, second and door, reverse phase
Device, wherein simulation gating switch includes the first to the second analog switch, and there are two input terminals, an output for each analog switch
End, duty ratio generator includes comparator, triangular wave oscillator；The input of first analog switch terminates reference signal, benchmark letter
It number include reference voltage, duty ratio reference signal, the first analog switch gates one of them, and duty ratio reference signal passes through duty
It is generated than reference generating circuit；The input of second simulation aperture terminates sampled signal, and sampled signal includes feedback signal sampling electricity
Pressure and duty ratio filtering feedback voltage, the second analog switch gate one of them, and feedback signal sampled voltage is adopting for converter
Sample signal；The non-inverting input terminal of PID error compensation network is the output of the first analog switch, and reverse input end is that the second simulation is opened
The output of pass；One input of comparator is the output of PID error compensation network, another input is that triangular wave oscillator generates
Triangle wave voltage signal, output duty cycle signal；The input of duty ratio low-pass filter is duty cycle signals, is exported as duty
Than filtering feedback voltage；First with one of door input is duty cycle signals, another input is start and stop signal；Second and door
One input be duty cycle signals reverse phase, another input be start and stop signal；First with the output of door is converter the
The driving signal d of one switching tube1；Second is the driving signal d of converter second switch with the output of door2；Driving signal d1、
d2The switching tube work of driving transducer after drive amplification.
As a kind of preferred embodiment of control circuit of the present invention, the sampled signal of the converter is converter input side
Sampled voltage, the sampled voltage of converter outlet side, sampled voltage, the converter input side electric current of inductive current are adopted in converter
The sampled voltage of sample voltage, converter outlet side electric current.
As a kind of preferred embodiment of control circuit of the present invention, the duty ratio reference generating circuit is made of divider,
The input of divider is the voltage sample v of converter input side1sWith the sampled voltage v of converter outlet side2s, the increasing of divider
Benefit is K, and the output of duty ratio reference generating circuit is duty ratio reference signal DREF, duty ratio reference signal DREFExpression formula be
DREF=K*v2s/v1s。
As a kind of preferred embodiment of control circuit of the present invention, the duty ratio reference generating circuit is amplified by summation operation
Device is constituted, and the input of sum operational amplifier is the voltage sample v of converter input side1sWith the sampled voltage of converter outlet side
v2s, sum operational amplifier is to v1sAnd v2sGain be respectively K1And K2, the output of duty ratio reference generating circuit is duty ratio
Reference signal DREF, duty ratio reference signal DREFExpression formula be DREF=K1*v1s+K2*v2s。
As a kind of preferred embodiment of control circuit of the present invention, the duty ratio reference generating circuit is by function generator structure
At the input of function generator is the voltage sample v of converter input side1s, converter outlet side sampled voltage v2s, transformation
The current feedback i of devicef, the Voltage Feedback v of converterf, the gain of function generator is K3, duty ratio reference generating circuit it is defeated
It is out duty ratio reference signal DREF, duty ratio reference signal DREFExpression formula be DREF=K3*f(V1s, V2s, if, vf)。
Suitable for analog control system downconverter soft start control method, when start and stop signal is logic low 0, the first mould
Quasi- switching gate duty ratio reference signal DREFPass through, the second analog switch gates duty ratio filtering feedback voltage dfedPass through, accounts for
Sky is than reference signal DREFWith duty ratio filtering feedback voltage dfedError amount through PID error compensation network adjustment after export duty
Than signal D, after duty cycle signals D reaches stable state, soft start is ready；When start and stop signal is logically high 1, the first simulation is opened
Close gating reference voltage VREFPass through, the second analog switch gates feedback signal sampled voltage vfedPass through, reference voltage VREFWith it is anti-
Feedback signal sampled voltage vrefError amount after the adjustment of PID error compensation network output duty cycle signal D, duty cycle signals D arrive
When up to stable state, converter is completed soft start and is simultaneously worked normally.
The invention adopts the above technical scheme compared with prior art, has following technical effect that
1, since PID regulator usually contains integral element, for analog regulator, compensator is defeated before activation
The phenomenon that being easy to appear saturation out, this is because usually containing integrating capacitor in adjuster, benchmark and feedback do not enter into closed loop
Stable state necessarily makes the unidirectional integral of adjuster bias to amplifier saturation.For analog controller, the saturation of compensator is difficult
Inhibit, and is not easy to be reset.Since adjuster during shutdown is to participate in duty ratio closed loop in the present invention, starting
When the phenomenon that being not in saturation.It will stabilise at the output of stable state set by duty ratio DREF。
2, present invention starting control circuit has been multiplexed the PID regulator of converter compensation loop, also has in structure very big
Simplify.
3, during shutdown present invention starting control circuit be switched on it is preset prepared a duty ratio close to stable state, and by
Shielding does not export.In starting moment, preset duty ratio is determined according to the working condition of circuit, for Buck root
The inductance of moment or so voltage can to start just according to the preset duty ratio of input and output voltage relationship close to balance, therefore
Very big inductive current impact will not be introduced.Such design also helps the start-up course for accelerating converter and reduces to enter and adjusts
Save the time of device stable state.
4, the present invention is suitable for soft start, multiplex dynamic cut phase soft start under the shutdown of converter.Simultaneously, when examining
When worry load is ohmic load, the present invention is equally applicable.Since under ohmic load, the control of output voltage zero, duty ratio is advised
Rule still meets DREF=V2/V1, only its value is approximately zero.Therefore, the present invention is that compatible battery load, a voltage-source type are negative
Carry the soft start-up scheme with ohmic load.
5, the present invention is to the converter under different control targets or control structure, such as current-mode control, voltage mode control
Converter, or control target be current source, voltage source, or control target be inductive current, the side V1 voltage, the side V2 voltage
Etc. situations, control circuit of the present invention is applicable, almost the influence of uncontrolled target selection.
Detailed description of the invention
Fig. 1 is proposed by the present invention suitable for analog control system downconverter SS (soft start) control circuit schematic diagram.
Fig. 2 is the power inverter main circuit diagram suitable for SS (soft start) control circuit of the present invention.
Fig. 3 is the duty ratio reference generating circuit 1 that preset duty cycle reference signal is generated in the present invention.
Fig. 4 is the duty ratio reference generating circuit 2 that preset duty cycle reference signal is generated in the present invention.
Fig. 5 is the duty ratio reference generating circuit 3 that preset duty cycle reference signal is generated in the present invention.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
In common case, cell type load is to can be used as a kind of typical case of voltage-source type load, is synchronized whole
Stream Bi-directional Buck converter also can be used as a kind of canonical topology of reversible transducer application, and analysis below will not distinguish especially change
Whether parallel operation works in two-way mode.
As shown in Figure 1, the major function for several parts that control circuit includes is as follows:
Simulate gating switch: the signal for selected input to output, the output for simulating gating switch is error compensation net
The input of network, it gates and send to the feedback signal of error compensation network and reference signal.At least two groups of gating switch of simulation, often
Group needs to gate one of two signals, blocks the transmission of another signal in every group.
PID error compensation network: error compensation network is the adjuster of compensation system dynamic characteristic, generally by operation amplifier
Device and several impedances composition.The zero pole point for configuring compensation network can be usually used to contain with the dynamic property defect of correction system
Ratio, integral, differentiation element composition, can generally be made of resistance-capacitance network.The output of error compensation network is duty ratio generator
Input signal.
Duty ratio generator: the output signal of error quadrilateral and the output triangle wave of triangular wave oscillator are for generating
Pwm signal.The signal opens shutdown to switching power converters control switch by amplification driving output for duty cycle signals,
Control converter transimission power and adjustment output voltage.
Duty ratio low-pass filter: duty ratio filter network is used to for the sampling output of duty ratio square-wave signal being filtered into smooth
Direct current signal become the input of wherein one group of simulation gating switch as duty ratio feedback signal.If assuming, duty ratio is effective
Output high level output is VH, low level VL, duty ratio D and filtered value d can be pushed away to obtainfedTheir relationship are as follows: dfed=
D·(VH-VL)。
Duty ratio reference generating circuit: voltage, current relationship of the duty ratio reference generating circuit according to controlled converter,
Duty ratio benchmark can be generated according to certain method.It can for duty ratio reference generating circuit 1, duty ratio reference generating circuit 2,
The one of which of duty ratio reference generating circuit 3, but it is not limited to these three forms.
It is illustrated in figure 2 type switching power inverter functionality structural schematic diagram.Wherein Switching Power Supply code converter can be non-
Isolated form topology includes voltage-dropping type Buck topology, boosting Boost type topology, buck Buck-Boost topology, isolated form topology
Include normal shock Forward topology, flyback Flyback converter topology, half-bridge Half-bridge topology, full-bridge Full-bridge
Topology.
In conjunction with Fig. 1, the control that Switching Power Supply code converter uses can be the control of univoltage ring, single electric current ring average current control
System, single electric current ring peak value comparison method, the bicyclic Average Current Control of voltage and current, the bicyclic peak value comparison method of voltage and current.
In conjunction with Fig. 2, the difference of target, Voltage Feedback v are controlled according to inverter power supply managementfIt can be in converter output
Voltage V1Side sampling feedback, voltage V2Side sampling feedback, current feedback ifIt can be inductor current feedback sampling feedback, I2Electricity
Flow sampling feedback, I1Current feedback sampling.Here, v1sFor V1Side voltage sampling signal, v2sFor V2Side voltage sampling signal.
In conjunction with Fig. 1, VREFSignal is the control reference voltage of convertor controls target in Fig. 2, vfedFor converter in Fig. 2
Control feedback signal vf、ifSelect one.DREFReference signal is controlled for duty；dfedFeedback signal is controlled for duty, it is duty ratio
The filtered output smoothing average value of square wave.
In conjunction with Fig. 1 and Fig. 2, by taking Buck quasi-converter as an example, duty ratio reference generating circuit can be duty in Fig. 3 in Fig. 1
Than reference generating circuit 1.According to the input and output voltage relationship of Buck quasi-converter, the expression formula of stable state duty ratio are as follows: DSTEADY
=V2/V1.Therefore the duty ratio reference voltage D of duty ratio reference generating circuit 1REFIt can be with are as follows: DREF=K*v2s/v1s.By the formula
Know reference voltage DREFComputing circuit generation can be made of a divider and a proportional amplifier, be also possible to one
A controller with calculation function generates.
For Buck class and Boost quasi-converter, according to the relationship D of input and output voltage and stable state duty ratioSTEADY=
V2/V1, duty ratio reference signal D in Fig. 1REFCan also duty ratio reference generating circuit 2 as shown in Figure 4 as simplifying circuit,
So that there is no division arithmetic and divider in system.Duty ratio reference generating circuit 2 can pass through several adders and scale operation
Device carrys out the division arithmetic in approximation circuit, reduces the realization scale and cost of circuit.The expression formula of duty ratio benchmark are as follows: DREF=
K1*v1s+K2*v2s。
For general main circuit topology, can be generated by duty ratio reference circuit 3 as shown in Figure 5.It is generalized to ordinary circumstance
When lower, preset duty cycle benchmark DREFThe relationship of the sampling quantity of stable state duty ratio and main circuit when can be according to soft start determines,
Duty ratio benchmark is generated by function generator.The input of function generator can be the voltage sample v in Fig. 21s, voltage sample
v2s, current feedback if, Voltage Feedback vfDeng.DREFIt can be the functional relation of above-mentioned variable: DREF=K3*f(v1s,v2s,if,vf)。
Fig. 1 is combined by taking Buck converter as an example below, the specific implementation of this patent schematic circuit is illustrated:
(1) when in shutdown state, start and stop machine control signal low level respectively with logical AND gate 1, with 2 phase of door and screen
Cover output drive signal d1、d2, while start and stop machine control signal low level has gated duty ratio filtering output as closed loop feedback
dfed, also gated duty ratio reference signal DREFAs a reference value.Duty ratio reference generating circuit is according to sampling and outputting voltage v2s
With input voltage v1sGenerate the value D of output duty cycle closed loopREF, SS (soft start) control circuit would operate in duty ratio closed loop mode.It is soft
Start control circuit to adjust using the closed loop of compensator, the duty ratio D for generating the output valve of compensator and triangular wave knot exists
Value after low-pass filtering will follow given value D after closed-loop stabilizationREF.Due to corresponding between duty ratio pulsewidth and filtering average value
Relationship is equivalent to and passes through DREFControl the pulsewidth of duty ratio.
(2) when converter is switched on, start stop signal provides the starting-up signal of high level, releases the duty with door 1 and door 2
Than shielding.Analog switch is by gated current closed-loop reference IREFI is fed back with current closed-loopfedAs the input signal of adjuster, together
When cancel switch pipe duty ratio shielded signal.In booting moment, due to having preset stable state duty ratio under cut-off condition, electricity
Sense left and right sides voltage more balances, therefore booting will not have very big rush of current.After starting-up signal arrives, the electricity of gating
Stream sampling and feed back input ifedThe duty ratio preset in current closed-loop mode, closed-loop speed by stable state so that controller works
Accelerate.At this point, if given current control benchmark VREFChange according to ramp signal, is also beneficial to closed loop output according to oblique
Slope signal carries out soft start, and starting speed can be by VREFPace of change determine.After start completion, VREFIt is changed to steady-state value.
By above-mentioned analysis, the control mode of preset duty cycle of the present invention solves the Buck converter of synchronous rectification form
Soft start problem under cell load.It should be pointed out that the thinking of " duty ratio closed loop " provided by the invention should not limit to and this
The relevant topologies such as Buck, Boost described in text or physical circuit way of realization as defined herein, other are with similar skill
Art route and circuit implementation should also be as belonging within protection scope as described herein.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all
According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention
Within.
Claims (6)
1. being suitable for analog control system downconverter SS (soft start) control circuit, which is characterized in that generated including duty ratio benchmark
Circuit, simulation gating switch, PID error compensation network, duty ratio generator, duty ratio low-pass filter, first and door, second
With door, phase inverter, wherein simulation gating switch include the first to the second analog switch, each analog switch there are two input terminal,
One output end, duty ratio generator include comparator, triangular wave oscillator；The input termination benchmark letter of first analog switch
Number, reference signal includes reference voltage, duty ratio reference signal, when start and stop signal is logic low, the choosing of the first analog switch
Logical duty ratio reference signal passes through, and when start and stop signal is logically high, the first analog switch gating reference voltage passes through, duty
It is generated than reference signal by duty ratio reference generating circuit；The input of second analog switch terminates sampled signal, sampled signal
Including feedback signal sampled voltage and duty ratio filtering feedback voltage, when start and stop signal is logic low, the second analog switch
Gating duty ratio filtering feedback voltage passes through, and when start and stop signal is logically high, the second analog switch gating feedback signal is adopted
Sample voltage passes through, and feedback signal sampled voltage is the sampled signal of converter；The non-inverting input terminal of PID error compensation network is the
The output of one analog switch, reverse input end are the output of the second analog switch；One input of comparator is PID error compensation
The output of network, another input are the triangle wave voltage signal that triangular wave oscillator generates, output duty cycle signal；Duty ratio
The input of low-pass filter is duty cycle signals, is exported as duty ratio filtering feedback voltage；First with one of door input to account for
Sky is start and stop signal than signal, another input；Second is the reverse phase of duty cycle signals with one of door input, another is defeated
Enter for start and stop signal；First is the driving signal d of converter first switch tube with the output of door1；Second is with the output of door
The driving signal d of converter second switch2；Driving signal d1、d2The switch plumber of driving transducer after drive amplification
Make.
2. being suitable for analog control system downconverter SS (soft start) control circuit according to claim 1, which is characterized in that institute
The sampled signal of converter is stated as electricity in the sampled voltage of converter input side, the sampled voltage of converter outlet side, converter
The sampled voltage of inducing current.
3. being suitable for analog control system downconverter SS (soft start) control circuit according to claim 2, which is characterized in that institute
It states duty ratio reference generating circuit to be made of divider, the input of divider is the voltage sample v of converter input side1sAnd transformation
The sampled voltage v of device outlet side2s, the gain of divider is K, and the output of duty ratio reference generating circuit is duty ratio reference signal
DREF, duty ratio reference signal DREFExpression formula be DREF=K*v2s/v1s。
4. being suitable for analog control system downconverter SS (soft start) control circuit according to claim 2, which is characterized in that institute
It states duty ratio reference generating circuit to be made of sum operational amplifier, the input of sum operational amplifier is converter input side
Voltage sample v1sWith the sampled voltage v of converter outlet side2s, sum operational amplifier is to v1sAnd v2sGain be respectively K1With
K2, the output of duty ratio reference generating circuit is duty ratio reference signal DREF, duty ratio reference signal DREFExpression formula be DREF
=K1*v1s+K2*v2s。
5. being suitable for analog control system downconverter SS (soft start) control circuit according to claim 2, which is characterized in that institute
It states duty ratio reference generating circuit to be made of function generator, the input of function generator is the voltage sample of converter input side
v1s, converter outlet side sampled voltage v2s, converter current feedback if, the Voltage Feedback v of converterf, function generator
Gain be K3, the output of duty ratio reference generating circuit is duty ratio reference signal DREF, duty ratio reference signal DREFTable
It is D up to formulaREF=K3*f(V1s, V2s, if, vf)。
6. being suitable for analog control system downconverter soft start control method, it is applied to be suitable for simulation described in claim 1
Control system downconverter SS (soft start) control circuit, which is characterized in that when start and stop signal is logic low 0, the first analog switch
Gate duty ratio reference signal DREFPass through, the second analog switch gates duty ratio filtering feedback voltage dfedPass through, duty ratio base
Calibration signal DREFWith duty ratio filtering feedback voltage dfedError amount through PID error compensation network adjustment after output duty cycle signal
After D, duty cycle signals D reach stable state, soft start is ready；When start and stop signal is logically high 1, the first analog switch gating
Reference voltage VREFPass through, the second analog switch gates feedback signal sampled voltage vfedPass through, reference voltage VREFAnd feedback signal
Sampled voltage vfedError amount after the adjustment of PID error compensation network output duty cycle signal D, duty cycle signals D reach stable state
When, converter is completed soft start and is worked normally.
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| CN108199580A (en) * | 2018-02-11 | 2018-06-22 | 常州博能新能源有限公司 | Bidirectional DC/DC device and its control method |
| CN110429819B (en) * | 2019-08-30 | 2021-09-07 | 四川长虹电器股份有限公司 | Feedforward duty ratio control method of bidirectional DC-DC converter |
| CN111786550B (en) * | 2020-07-29 | 2022-04-05 | 四川长虹电器股份有限公司 | Method for realizing soft start of bidirectional converter |
| CN111917304B (en) * | 2020-08-10 | 2022-05-10 | 北京新雷能科技股份有限公司 | Digital power supply |
| CN112069758B (en) * | 2020-08-18 | 2024-03-29 | 西安理工大学 | LLC converter soft start parameter optimization method based on simplified numerical model |
| CN114221535B (en) * | 2021-12-21 | 2023-12-19 | 阳光电源股份有限公司 | Vehicle-mounted charger, DCDC converter and control method |
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| CN104242623A (en) * | 2014-09-05 | 2014-12-24 | 中南民族大学 | Quick start method and quick start control circuit of switching power supply |
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