CN108521221A - It is a kind of based on exponential convergence to the current-sharing control method of DC-DC types Buck converters in parallel - Google Patents
It is a kind of based on exponential convergence to the current-sharing control method of DC-DC types Buck converters in parallel Download PDFInfo
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- CN108521221A CN108521221A CN201810442392.5A CN201810442392A CN108521221A CN 108521221 A CN108521221 A CN 108521221A CN 201810442392 A CN201810442392 A CN 201810442392A CN 108521221 A CN108521221 A CN 108521221A
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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
- H02M3/158—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 including plural semiconductor devices as final control devices for a single load
- H02M3/1584—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 including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of based on exponential convergence to the current-sharing control method of DC DC types Buck converters in parallel, obtains the voltage derivative of the inductive current derivative and converter output terminal of each Buck branch road in parallelThe tracking error of voltage is defined, dynamical equation is obtained；The function of load and time is obtained according to the response curve of the output voltage and inductive current of the resistance change of DC DC type Buck converters load according to the value for the duty ratio for controlling switch in each branch of equalizing controller of the determining gain of parameter based on exponential convergence.The advantages of invention, is：Exponential convergence equalizing controller in the present invention realizes faster rate of convergence and better load disturbance rejection ability.The robustness of system is improved, and improves the sharing control speed and precision of DC DC types Buck changer systems in parallel.
Description
Technical field
The present invention relates to power electronics control technology fields, especially a kind of to be based on exponential convergence to Buck converters in parallel
The novel current-sharing control method of circuit.
Background technology
DC-DC types Buck transformation systems in parallel have large capacity, high efficiency, high reliability and inexpensive advantage, therefore
The extensive use in high-power load system.However, in practice, the parameter of each Buck converter is not necessarily identical
, thus different inductive currents is will produce, this influences whether the service life of Buck converters.Therefore, for DC-DC types in parallel
For Buck transformation systems, maximum challenge is exactly the design of equalizing controller.
For many years, control field produces much about the control strategy flowed.Droop control, Backstepping sharing control
Technology, two close cycles sharing control technology, thermal stress sharing control.It is noted that most of sharing control is all Linear Control.So
And parallel connection DC-DC type Buck converters are nonlinear Control object, Linear Control can not reach very high accuracy and quickly
Convergence.In recent years, many nonlinear Controls, such as chaos controlling, sliding formwork control, the control based on exponential convergence are also applied to
This, achieves prodigious achievement, but be all used for single DC-DC types Buck converters.All pertinent literatures and patent have been consulted,
I be first by exponential convergence for multiple, in DC-DC types Buck transformation systems in parallel.Relative to conventional method, it is based on
The control of exponential convergence has faster rate of convergence and better load disturbance rejection ability.
Invention content
In order to overcome the above-mentioned prior art, for this purpose, the present invention provides a kind of equalizing controller based on exponential convergence
Buck transformation systems and its control method.
To achieve the above object, the present invention uses following technical scheme：
It is a kind of based on exponential convergence to the current-sharing control method of DC-DC types Buck converters in parallel, DC-DC types Buck in parallel
Converter includes the Buck branches of a item parallel connections, and every Buck branch road includes controlled switch S, diode D, inductance L, controlled to open
The anode of the input terminal and input power that close S connects, the cathode connection of one end and diode D of output end and inductance, inductance
The other end is connected by the anode of the cathode and diode of resistance R and input power, and the both ends shunt capacitance C of resistance R, a items are simultaneously
The Buck branches of connection share the capacitance C for being connected in parallel on output end and resistance R, every Buck branch in parallel correspond to corresponding inductance L
With control switch S；Equalizing controller controls switch S respectively1, S2..., SaDuty ratio, equalizing controller obtain it is desired defeated
Go out voltage value UdWith the current value of the road inductance of every Buck, input power, output voltage U in Buck circuits in parallelc, special
Sign is, includes the following steps：
S1, obtain each Buck branch road in parallel inductive current derivative and converter output terminal voltage derivative
Expression formula,
Wherein μ1, μ2..., μaIt is corresponding Buck branch road control switch S1, S2..., SaDuty ratio, μ1, μ2...,
μa∈ (0,1), E are the voltage of the input power of Buck converters, L1,L2,...,LaIt is the electricity of Buck branch in parallel road respectively
Sense, C is the resistance that capacitance, R are in Buck converters in Buck converters, UcFor the voltage value at the both ends resistance R；
S2, the tracking error for defining voltage, X1=Ud-Uc, obtain dynamical equation
It is defined as follows formula：
X2,iThe differential term for indicating the voltage of i-th Buck converter, by adjusting this control gain；
X3,iIndicate that the electric current of i-th Buck circuit cooperates with sum of the deviations item；By adjusting this so that electric current reaches equal
Flow effect；
S3, according to the step S2 parameter obtained and input voltage E, inductance value, capacitance, variation load resistance R, it is expected
Output voltage values Ud, equalizing controller gain parameter K1、K2、K3, obtain and controlled in each branch of finite time equalizing controller
The value of the duty ratio of switch, i.e.,
The gain parameter of equalizing controller is just K1、K2、K3＞ 0；
It is S4, bent according to the response of the output voltage and inductive current of the resistance change of DC-DC type Buck converters load
Line obtains the function of load and time.
The advantage of the invention is that：
(1) equalizing controller based on exponential convergence in the present invention realizes faster rate of convergence and preferably bears
Carry interference rejection capability.The robustness of system is improved, and improves DC-DC types Buck transformation system sharing controls in parallel
Speed and precision.
(2) inductance L in each DC-DC types Buck branchesaElectric current respectively as the input value of equalizing controller, reach
The purpose that whole system flows.
Description of the drawings
Fig. 1 is a kind of functional block diagram of the Buck transformation systems of the equalizing controller based on exponential convergence of the present invention.
Fig. 2 is the Buck transformation systems and traditional PID control of a kind of equalizing controller based on exponential convergence of the present invention
Buck transformation system output voltages restrain Contrast on effect lab diagram.
Fig. 3 is the Buck transformation systems and traditional PID control of a kind of equalizing controller based on exponential convergence of the present invention
Buck transformation systems inductive current flows Contrast on effect lab diagram.
Fig. 4 is the Buck transformation systems and traditional PI D of the equalizing controller based on exponential convergence under conditions of load sudden change
The Buck transformation system output voltages of control restrain Contrast on effect lab diagram.
Fig. 5 is the Buck transformation systems and traditional PI D of the equalizing controller based on exponential convergence under conditions of load sudden change
The Buck transformation systems inductive current of control flows Contrast on effect lab diagram.
Fig. 6 is the schematic diagram of parallel connection Buck circuits.
Specific implementation mode
It is a kind of based on exponential convergence to the current-sharing control method of DC-DC types Buck converters in parallel, as shown in figures 1 to 6,
Converter includes equalizing control circuit and parallel connection DC-DC type Buck converters, and the parallel connection DC-DC type Buck converters include negative
Resistance R, the capacitance C in parallel with load resistance, power supply E are carried, if the anode of power supply E passes through main line DC-DC type Buck branch in parallel
Lu Houyu capacitances C is connected with one end of load resistance R, and the cathode of power supply E is connect with the other end of capacitance C and load resistance R；
Include controllable switch S per DC-DC types Buck branches all the waya, diode Da, inductance La, the controllable switch Sa's
Input terminal is connect with the anode of power supply E, output end and diode DaCathode and inductance LaOne end connection, controlled end with flow
The appointed output terminal of controller connects, the diode DaAnode be connected to ground, inductance LaThe other end as DC-DC types
The output end of Buck branches is connect with one end of capacitance C and load resistance R, inductance L in every DC-DC types Buck branches all the waya's
Electric current, the both ends load resistance R pressure difference Uc, desired output voltage UdRespectively as the input value of equalizing controller.
In this embodiment, DC-DC types Buck converters include the DC-DC type Buck branches of a item parallel connections.First DC-
DC type Buck branches include controllable switch S1, diode D1, inductance L1, second DC-DC type Buck branch includes controllable switch
S2, diode D2, inductance L2, a articles DC-DC type Buck branch includes controllable switch Sa, diode Da, inductance La。
Equalizing controller controls switch S respectively1, S2..., SaDuty ratio, it is electric that equalizing controller obtains desired output
Pressure value UdWith the current value of the road inductance of every Buck, input power, output voltage U in Buck circuits in parallelc。
Using the control method of the Buck converters of the above-mentioned equalizing controller based on exponential convergence, include the following steps：
S1, obtain each Buck branch road in parallel inductive current derivative and converter output terminal voltage derivative
Expression formula,
Wherein μ1, μ2..., μaIt is corresponding Buck branch road control switch S1, S2..., SaDuty ratio, μ1, μ2...,
μa∈ (0,1), E are the input voltage of Buck converters, L1, L2..., LaIt is the inductance of Buck branch in parallel road respectively, C is
Capacitance, R are the resistance in Buck converters, U in Buck converterscFor the voltage value at the both ends resistance R；
S2, the tracking error for defining voltage, X1=Ud-Uc, wherein UdFor reference voltage, dynamical equation is obtained
It is defined as follows formula：
Annotation：Define X2,iPractical significance herein can regard the differential term of the voltage of i-th of circuit as.In controller
In, by adjusting this control gain, realize more preferable voltage-tracing effect.
Annotation：Define X3,iPractical significance be each circuit electric current collaboration sum of the deviations item.By adjusting this, make
Electric current reaches and flows effect.
S3, according to the step S2 parameter obtained and input voltage E, inductance value, capacitance, variation load resistance R, it is expected
Output voltage values Ud, equalizing controller gain parameter K1、K2、K3, obtain and controlled in each branch of finite time equalizing controller
The value of the duty ratio of switch, i.e.,
For following a=2, DC-DC types Buck converter circuits in parallel are made of two DC-DC type Buck converters.Its
In, two transducer element values are respectively：Input voltage E=16V, inductance L1=L2=100 μ H, capacitance C=1000 μ F,
Load resistance R=5 Ω, desired output voltage Ud=20V.
Sharing control implement body gain parameter based on exponential convergence is：
K1=3.0, K2=0.01, K3=0.02
Other parameters remain unchanged, and obtain the output voltage of the resistance change loaded with DC-DC type Buck converters
With the response curve of inductive current, in order to embody the technique effect of the present invention, under identical Parameter Conditions, traditional PID is controlled
The control gain of device processed is：kp=1, ki=10, kd=1.
It obtains such as Fig. 2, the DC-DC type Buck converter circuits and biography of the equalizing controller based on exponential convergence shown in 3
The DC-DC type Buck converter circuit output voltages convergence Contrast on effect lab diagram of system PID control, inductive current flow effect pair
Compare lab diagram；Fig. 4, under conditions of load sudden change shown in 5, the DC-DC types Buck of the equalizing controller based on exponential convergence becomes
Converter circuit and the DC-DC type Buck converter circuit output voltages of traditional PID control restrain Contrast on effect lab diagram.
Obtain the function of load and time.The specific variation of load is as follows：
The above results show relative to traditional controller, the equalizing controller based on exponential convergence in the present invention, effectively
The rate of convergence of voltage and current is improved, there is stronger anti-interference rejection ability, improve the robustness of system, and carry
The high speed and precision of DC-DC types Buck transformation system sharing controls in parallel.
The preferred embodiment that these are only the invention is not intended to limit the invention creation, all in the present invention
All any modification, equivalent and improvement etc., should be included in the guarantor of the invention made by within the spirit and principle of creation
Within the scope of shield.
Claims (1)
1. it is a kind of based on exponential convergence to the current-sharing control method of DC-DC types Buck converters in parallel, DC-DC types Buck in parallel becomes
Parallel operation includes the Buck branches of a item parallel connections, and every Buck branch road includes controlled switch S, diode D, inductance L, controlled switch S
Input terminal and the anode of input power connect, the connection of the cathode of one end and diode D of output end and inductance, inductance it is another
End is connected by the anode of the cathode and diode of resistance R and input power, the both ends shunt capacitance C of resistance R, a item parallel connections
Buck branches share the capacitance C for being connected in parallel on output end and resistance R, every Buck branch in parallel correspond to corresponding inductance L and control
Make switch S；Equalizing controller controls switch S respectively1, S2..., SaDuty ratio, it is electric that equalizing controller obtains desired output
Pressure value UdWith the current value of the road inductance of every Buck, input power, output voltage U in Buck circuits in parallelc, feature exists
In including the following steps：
S1, obtain each Buck branch road in parallel inductive current derivative and converter output terminal voltage derivativeExpression
Formula,
Wherein μ1, μ2..., μaIt is corresponding Buck branch road control switch S1, S2..., SaDuty ratio, μ1, μ2..., μa∈
(0,1), E are the voltage of the input power of Buck converters, L1,L2,...,LaIt is the inductance of Buck branch in parallel road respectively, C is
Capacitance, R are the resistance in Buck converters, U in Buck converterscFor the voltage value at the both ends resistance R；
S2, the tracking error for defining voltage, X1=Ud-Uc, obtain dynamical equation
It is defined as follows formula：
X2,iThe differential term for indicating the voltage of i-th Buck converter, by adjusting this control gain；
X3,iIndicate that the electric current of i-th Buck circuit cooperates with sum of the deviations item；By adjusting this so that electric current reaches stream effect
Fruit；
S3, according to the step S2 parameter obtained and input voltage E, inductance value, capacitance, variation load resistance R, desired defeated
Go out voltage value Ud, equalizing controller gain parameter K1、K2、K3, obtain and control switch in each branch of finite time equalizing controller
Duty ratio value, i.e.,
The gain parameter of equalizing controller is just K1、K2、K3＞ 0；
S4, according to DC-DC type Buck converters load resistance change output voltage and inductive current response curve, obtain
It must load and the function of time.
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| CN201810442392.5A CN108521221B (en) | 2018-05-10 | 2018-05-10 | It is a kind of based on exponential convergence to the current-sharing control method of DC-DC type Buck converter in parallel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117792094A (en) * | 2024-02-28 | 2024-03-29 | 西安为光能源科技有限公司 | Input-parallel-output-parallel non-isolated converter circulating current suppression circuit and method |
| CN117856625A (en) * | 2024-03-07 | 2024-04-09 | 西安为光能源科技有限公司 | IPOP non-isolated PET topological structure for inhibiting circulation and control method thereof |
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| US6346798B1 (en) * | 1999-06-07 | 2002-02-12 | Stmicroelectronics S.R.L. | Single wire current sharing control technique for the parallel/redundant operation of a plurality of PWM converters |
| US6414469B1 (en) * | 1998-12-03 | 2002-07-02 | Virginia Tech Intellectual Properties, Inc. | Current sensing and current sharing |
| CN1581654A (en) * | 2003-08-05 | 2005-02-16 | 沛亨半导体股份有限公司 | Voltage-dropping DC-to-DC power supply converter and power supply converting method |
| CN105576972A (en) * | 2016-01-26 | 2016-05-11 | 江苏大学 | Chattering-free sliding mode control method for buck converter |
| CN105871210A (en) * | 2016-04-14 | 2016-08-17 | 上海电力学院 | Finite time passive control method for Buck converter |
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2018
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Patent Citations (5)
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| US6414469B1 (en) * | 1998-12-03 | 2002-07-02 | Virginia Tech Intellectual Properties, Inc. | Current sensing and current sharing |
| US6346798B1 (en) * | 1999-06-07 | 2002-02-12 | Stmicroelectronics S.R.L. | Single wire current sharing control technique for the parallel/redundant operation of a plurality of PWM converters |
| CN1581654A (en) * | 2003-08-05 | 2005-02-16 | 沛亨半导体股份有限公司 | Voltage-dropping DC-to-DC power supply converter and power supply converting method |
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| CN105871210A (en) * | 2016-04-14 | 2016-08-17 | 上海电力学院 | Finite time passive control method for Buck converter |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117792094A (en) * | 2024-02-28 | 2024-03-29 | 西安为光能源科技有限公司 | Input-parallel-output-parallel non-isolated converter circulating current suppression circuit and method |
| CN117792094B (en) * | 2024-02-28 | 2024-04-30 | 西安为光能源科技有限公司 | Circulating current inhibition method for input-parallel output-parallel non-isolated converter |
| CN117856625A (en) * | 2024-03-07 | 2024-04-09 | 西安为光能源科技有限公司 | IPOP non-isolated PET topological structure for inhibiting circulation and control method thereof |
| CN117856625B (en) * | 2024-03-07 | 2024-05-10 | 西安为光能源科技有限公司 | IPOP non-isolated PET topological structure for inhibiting circulation and control method thereof |
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