CN108768170B - Method for controlling operation mode of Buck-Boost converter through duty ratio bias - Google Patents

Method for controlling operation mode of Buck-Boost converter through duty ratio bias Download PDF

Info

Publication number
CN108768170B
CN108768170B CN201810589269.6A CN201810589269A CN108768170B CN 108768170 B CN108768170 B CN 108768170B CN 201810589269 A CN201810589269 A CN 201810589269A CN 108768170 B CN108768170 B CN 108768170B
Authority
CN
China
Prior art keywords
buck
tube
voltage
boost converter
duty ratio
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201810589269.6A
Other languages
Chinese (zh)
Other versions
CN108768170A (en
Inventor
游江
范巍岩
廖梦岩
程连斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Harbin Engineering University
Original Assignee
Harbin Engineering University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Harbin Engineering University filed Critical Harbin Engineering University
Priority to CN201810589269.6A priority Critical patent/CN108768170B/en
Publication of CN108768170A publication Critical patent/CN108768170A/en
Application granted granted Critical
Publication of CN108768170B publication Critical patent/CN108768170B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H02M3/1582—Buck-boost converters

Abstract

The invention belongs to the technical field of power electronics, and particularly relates to a method for controlling the operation mode of a Buck-Boost converter through duty ratio bias. Defining the minimum and maximum duty ratios allowed by the work of two switching tubes of the Buck-Boost converter as dminAnd dmax(ii) a Determining a duty ratio bias signal c of the Buck-Boost converter which can be in single-tube Buck step-down operation in the input voltage variation range according to the variation range of the input side direct-current power supply voltage and the expected output voltage value1(ii) a Determining a duty ratio bias signal c of the Buck-Boost converter which can be in single-tube Boost operation in the input voltage variation range according to the variation range of the input side direct-current power supply voltage and an expected output voltage value2(ii) a The method can ensure that only one tube of the double tubes of the Buck-Boost converter is in a chopping state after a control system reaches a steady state, so that the converter can obtain higher efficiency compared with the double-tube single-mode operation.

Description

Method for controlling operation mode of Buck-Boost converter through duty ratio bias
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a method for controlling the operation mode of a Buck-Boost converter through duty ratio bias.
Background
The double-tube Buck-Boost converter has the input and output voltage homopolarity and the Buck-Boost characteristic, and is suitable for the preceding stage direct current conversion of a two-stage converter with wide input voltage. From the control mode, there are two main types: one mode is a single mode, that is, a Buck-Boost converter with two tubes is subjected to unified modeling and controlled by a unified duty ratio (and driving signals of the two tubes can be synchronous and have a certain phase difference). However, this operation mode has a problem that the inductor current ripple is relatively large or the average value of the inductor current is high. The other mode is a dual-mode operation mode, namely, the Buck-Boost converter can respectively operate in a Buck mode (a voltage reduction mode) and a Boost mode (a voltage boosting mode) according to the magnitude of the input direct-current voltage. In the conventional application scheme, the mode in which the system operates is generally determined by the magnitude of the input voltage detected by the control system, and the problem of how to realize smooth switching between the two modes in the vehicle is solved.
In summary, the problems of relatively large inductive current ripple, high average value of inductive current, low working efficiency of double-tube, and the like exist in the prior art.
Disclosure of Invention
The invention provides a method for controlling the operation mode of a Buck-Boost converter through duty ratio bias, which can ensure that the Buck-Boost converter is in a single-tube voltage reduction or single-tube voltage increase working mode within an allowed input voltage variation range. The converter can be made to achieve higher efficiency relative to a dual-tube mode of operation.
A method of controlling the operating mode of a Buck-Boost converter by duty cycle biasing, comprising the steps of:
defining the minimum and maximum duty ratios allowed by the work of two switching tubes of the Buck-Boost converter as dminAnd dmax；
Determining a duty ratio bias signal c of the Buck-Boost converter which can be in single-tube Buck step-down operation in the input voltage variation range according to the variation range of the input side direct-current power supply voltage and the expected output voltage value1；
Determining a duty ratio bias signal c of the Buck-Boost converter which can be in single-tube Boost operation in the input voltage variation range according to the variation range of the input side direct-current power supply voltage and an expected output voltage value2；
According to two bias signals c obtained under the condition of meeting the single-tube Buck and single-tube Boost1、c2Taking the maximum value as a duty ratio bias signal c of the Buck-Boost converter;
generating a train of sawtooth carriers CW in a control system in accordance with an output voltage command vo*With the actual voltage v detected by the voltage sensor VSoThe difference is fed to a voltage regulator GvCalculating to obtain a duty ratio control signal d;
applying a positive bias c to the control signal d to obtain d1D + c. To control signalSign d applying a negative bias c to obtain d2＝d-c；
Using sawtooth carriers CW for d1And d2Modulating to obtain respectively-driven switch tubes S1And S2The pulse signal of (2).
The minimum duty ratio and the maximum duty ratio which are allowed by the work of two switching tubes of the Buck-Boost converter are defined to be d respectivelyminAnd dmaxThe method comprises the following steps:
Figure BDA0001690148150000021
wherein d is1Is S1Duty ratio of the tube, d2Is S2Duty cycle of the tube. When the actual duty cycle of the tube is greater than dmaxThe tube is in a full conduction state, and the duty ratio is 1; when the actual duty cycle of the tube is less than dminThe tube will be in a fully off state with a duty cycle of 0.
And determining a duty ratio bias signal c of the Buck-Boost converter which can be in single-tube Buck step-down operation in the input voltage variation range according to the variation range of the input side direct-current power supply voltage and the expected output voltage value1The method comprises the following steps:
if the Buck-Boost converter is in a single-tube Buck mode, S is1Chopping wave, S2Off, then in its inductor current iLIn the continuous case have
Figure BDA0001690148150000022
The following two inequalities can be obtained according to the above equation set
Figure BDA0001690148150000023
Figure BDA0001690148150000024
Controller output needs to be satisfied
d＜min(0.5,dmin+c1,dmax-c1)
Figure BDA0001690148150000025
Wherein v isoFor the actual voltage, v, detected by the voltage sensor VSinmaxD is the output voltage command vo*And the actual voltage v detected by the voltage sensor VSoDifference of difference, dmaxAt maximum duty cycle, dminIs the minimum duty cycle, c1The method is a duty ratio bias signal which can be used for a single-tube Buck step-down operation of the Buck-Boost converter in an input voltage variation range.
And determining a duty ratio bias signal c of the Buck-Boost converter which can be in single-tube Boost operation in the input voltage variation range according to the variation range of the input side direct-current power supply voltage and the expected output voltage value2The method comprises the following steps:
if the Buck-Boost converter is in a single-tube Boost mode, namely S2Chopping wave, S1On conduction, then in its inductive current iLIn the continuous case have
Figure BDA0001690148150000031
The following two inequalities can be obtained according to the above equation set
Figure BDA0001690148150000032
Figure BDA0001690148150000033
Controller output needs to be satisfied
d＞max(0.5,dmin+c2,dmax-c2)
Figure BDA0001690148150000034
Wherein v isoFor the actual voltage, v, detected by the voltage sensor VSinminD is the output voltage command vo*And the actual voltage v detected by the voltage sensor VSoDifference of difference, dmaxAt maximum duty cycle, dminIs the minimum duty cycle, c2The method is a duty ratio bias signal which can be used for a Buck-Boost converter in a single-tube Boost operation in an input voltage variation range.
The method for taking the maximum value of two bias signals obtained under the condition of meeting the single-tube Buck and single-tube Boost as the duty ratio bias signal c of the Buck-Boost converter comprises the following steps:
duty cycle bias signal of
Figure BDA0001690148150000035
Taking c as
Figure BDA0001690148150000036
Wherein c is c1And c2Maximum value between, vinminIs the minimum voltage value, v, of its front-end DC power supplyoFor the actual voltage detected by the voltage sensor VS, dmaxAt maximum duty cycle, dminIs the minimum duty cycle.
The invention has the beneficial effects that:
the method can ensure that only one tube of the double tubes of the Buck-Boost converter is in a chopping state after a control system reaches a steady state, so that the converter can obtain higher efficiency compared with the double-tube single-mode operation.
Drawings
Fig. 1 is a flow chart of a method for controlling the operating mode of a Buck-Boost converter by duty cycle biasing.
Fig. 2 is a main circuit diagram of the Buck-Boost converter.
FIG. 3 is a schematic diagram of control strategy of duty ratios of two switching tubes of the Buck-Boost converter.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Fig. 2 shows a main circuit of a Buck-Boost converter as described in the patent. The voltage of the front end DC power supply is vinThe output current of the DC power supply is iinA capacitor C connected in parallel at both ends of the DC power supply1For stabilizing the output of the dc power supply. Capacitor C1One end connected with the positive pole of the direct current power supply is connected with a switch tube S1Called Buck tube, the other end of which is connected with a diode D1Such as indicated by point a in figure 1. D1The other end of the second switch is connected with the negative electrode of the direct current power supply. The point A is connected to one end of an inductor L, and the other end of the inductor L, i.e. the point B in FIG. 1, is connected to a switching tube S2The other end of the Boost tube is connected with the negative electrode of the direct current power supply. Point B is connected with a diode D2Anode of (D)2Cathode of (2) is connected with a capacitor C2One end of (A), C2The other end of the second switch is connected with the negative electrode of the direct current power supply. Capacitor C2Namely the output filter capacitor of the Buck-Boost converter.
Fig. 3 shows a duty ratio control strategy (taking voltage single closed-loop control as an example) for two transistors of the Buck-Boost converter. Output voltage command vo*With the actual voltage v detected by the voltage sensor VSoThe difference is fed to a voltage regulator GvCalculating to obtain a control signal d, adding a bias signal c to d to obtain a duty ratio control signal d1D + c; meanwhile, subtracting a bias signal c from d to obtain a duty ratio control signal d2D-c; using high-frequency sawtooth carriers CW to respectively pair d1And d2Modulation is performed. Will be paired with d1Modulating the resulting pulse signal for driving S1Pipe, will be to d2Modulating the resulting pulse signal for driving S2A tube. If d is1Magnitude of S higher than carrier CW1Is always in the on state, S2Chopping, wherein the converter is in a boost conversion state; if d is2Values below 0, S2Is always in the off state, S1Chopping is carried out, and the converter is in a buck conversion state.
The invention provides a duty ratio bias design method for realizing dual-mode operation of a Buck-Boost converter by applying reasonable duty ratio bias. The method is used for a double-tube Buck-Boost converter, the same offset (c) is added to and subtracted from a duty ratio control signal (d) output by a controller respectively, and the obtained actual duty ratio signal (d) is used1D + c) for driving Buck tubes, (d) will be2D-c) is used for driving the Boost tube. And duty ratio signal d1And d2With a 180 phase shift. The patent provides a design method of duty ratio bias c in a specific input voltage change range, so as to ensure that the Buck-Boost converter can work in a single-tube Buck (voltage reduction) mode or a single-tube Boost (voltage boosting) mode in a self-adaptive mode according to the change of input voltage. Because the single-tube working mode is always adopted, the efficiency of the whole converter is obviously improved compared with the double-tube working mode.
A design method for controlling the operation mode of a Buck-Boost converter through duty ratio bias is characterized by comprising the following steps:
(1) by adding and subtracting the same offset (c) to and from the duty cycle control signal (d) output by the Buck-Boost converter controller, respectively, and applying the actual duty cycle signal (d) obtained1D + c) for driving Buck tubes, (d) will be2D-c) is used for driving the Boost tube. Therefore, under the condition of ensuring that the offset c is reasonably set, the Buck-Boost converter can realize the conversion according to the input voltage, and the Buck-Boost converter can adaptively operate in a single-tube Buck mode or a single-tube Boost mode.
(2) The patent provides a design method of duty ratio offset c in a specific input voltage variation range, which can ensure that only one tube of a double-tube of a Buck-Boost converter is in a chopping state after a control system reaches a steady state, so that the converter can obtain higher efficiency compared with double-tube single-mode operation.
The invention belongs to the technical field of power electronics, and particularly relates to a design method for controlling an operation mode of a Buck-Boost converter through duty ratio bias.
The double-tube Buck-Boost converter has the input and output voltage homopolarity and the Buck-Boost characteristic, and is suitable for the preceding stage direct current conversion of a two-stage converter with wide input voltage. From the control mode, there are two main types: one mode is a single mode, that is, a Buck-Boost converter with two tubes is subjected to unified modeling and controlled by a unified duty ratio (and driving signals of the two tubes can be synchronous and have a certain phase difference). However, this operation mode has a problem that the inductor current ripple is relatively large or the average value of the inductor current is high. The other mode is a dual-mode operation mode, namely, the Buck-Boost converter can respectively operate in a Buck mode (a voltage reduction mode) and a Boost mode (a voltage boosting mode) according to the magnitude of the input direct-current voltage. In the conventional application scheme, the mode in which the system operates is generally determined by the magnitude of the input voltage detected by the control system, and the problem of how to realize smooth switching between the two modes in the vehicle is solved. The method provided by the patent can improve the problems of dual-mode operation to a certain extent.
The invention provides a design method for controlling an operation mode of a Buck-Boost converter through duty ratio bias, which specifically comprises the following steps:
the duty ratio bias design method for controlling the operation mode of the Buck-Boost converter by reasonably setting the duty ratio bias can ensure that the Buck-Boost converter is in a single-tube voltage reduction or single-tube voltage increase working mode within an allowed input voltage variation range. The converter can be made to achieve higher efficiency relative to a dual-tube mode of operation.
The main contributions and characteristics of the invention are:
(1) the same offset (c) is added and subtracted in a duty ratio control signal (d) output by the Buck-Boost converter controller, the obtained actual duty ratio signal (d1 ═ d + c) is used for driving the Buck tube, and (d2 ═ d-c) is used for driving the Boost tube. Therefore, under the condition of ensuring that the offset c is reasonably set, the Buck-Boost converter can realize the conversion according to the input voltage, and the Buck-Boost converter can adaptively operate in a single-tube Buck mode or a single-tube Boost mode.
(2) The patent provides a design method of duty ratio offset c in a specific input voltage variation range, which can ensure that only one tube of a double-tube of a Buck-Boost converter is in a chopping state after a control system reaches a steady state, so that the converter can obtain higher efficiency compared with double-tube single-mode operation.
The object of the invention is achieved by combining the attached figure 1:
fig. 2 shows a main circuit of a Buck-Boost converter as described in the patent. The voltage of the front-end direct-current power supply is vin, the output current of the direct-current power supply is iin, and the capacitors C1 connected in parallel at two ends of the direct-current power supply are used for stabilizing the output of the direct-current power supply. One end of the capacitor C1 connected to the positive electrode of the dc power supply is connected to a switching tube S1, which is called a Buck tube, and the other end of the Buck tube is connected to the cathode of a diode D1, as indicated by point a in fig. 1. The other end of D1 is connected to the negative electrode of the dc power supply. The point a is connected to one end of an inductor L, and the other end of the inductor L, i.e., the point B in fig. 1, is connected to a switching tube S2, which is called a Boost tube, and the other end of the Boost tube is connected to the negative electrode of the dc power supply. The point B is connected with the anode of a diode D2, the cathode of D2 is connected with one end of a capacitor C2, and the other end of C2 is connected with the cathode of a direct current power supply. The capacitor C2 is the output filter capacitor of the Buck-Boost converter.
Fig. 3 shows a duty ratio control strategy (taking voltage single closed-loop control as an example) for two transistors of the Buck-Boost converter. The difference between the output voltage command vo and the actual voltage vo detected by the voltage sensor VS is fed to the voltage regulator Gv to be calculated to obtain a control signal d, and one offset signal c is added to d to obtain a duty ratio control signal d1 ═ d + c; meanwhile, subtracting an offset signal c from d to obtain a duty ratio control signal d2 ═ d-c; d1 and d2 are modulated with high frequency sawtooth carriers CW, respectively. The pulse signal obtained by modulating d1 is used to drive the S1 tube, and the pulse signal obtained by modulating d2 is used to drive the S2 tube.
If the value of d1 is higher than the amplitude of the carrier wave CW, S1 is always in a conducting state, S2 performs chopping, and the converter is in a boosting conversion state; if the value of d2 is lower than 0, S2 is always in an off state, S1 is chopped, and the converter is in a buck conversion state.
Fig. 1 is a main circuit of the Buck-Boost converter disclosed in the patent.
Fig. 2 is a control strategy of duty ratios of two switching tubes of the Buck-Boost converter.
The execution flow of the design method for controlling the operation mode of the Buck-Boost converter through duty ratio bias is described as follows.
(1) Defining the maximum and minimum duty ratios allowed by the work of two switching tubes of the Buck-Boost converter as dminAnd dmaxAnd satisfy
Figure BDA0001690148150000061
Wherein d is1Is S1Duty ratio of the tube, d2Is S2Duty cycle of the tube. When the actual duty cycle of the tube is greater than dmaxThe tube will be in all conducting state and the duty ratio is 1; when the actual duty cycle of the tube is less than dminThe tube will be in a fully off state and the duty cycle is 0.
(2) And determining a duty ratio bias signal c of the Buck-Boost converter which can be in single-tube Buck step-down operation in the input voltage variation range according to the variation range of the input side direct-current power supply voltage and the expected output voltage value. The process is as follows:
according to fig. 1, if the Buck-Boost converter is in the single-tube Buck mode (S)1Chopping wave, S2Off), then at its inductor current iLIn the continuous case have
Figure BDA0001690148150000071
Two inequality equation sets (2) and (3) can be obtained according to (1)
Figure BDA0001690148150000072
Figure BDA0001690148150000073
The controller output is satisfied at the moment according to (2)
d＜min(0.5,dmin+c,dmax-c) (4)
According to (3), a
Figure BDA0001690148150000074
(3) And determining a duty ratio bias signal c of the Buck-Boost converter which can be in Boost operation in the input voltage variation range according to the variation range of the input side direct current power supply voltage and the expected output voltage value. The process is as follows:
according to the attached figure 1, if the Buck-Boost converter is in a single-tube Boost mode (S)2Chopping wave, S1Always on) then in its inductor current iLIn the continuous case have
Figure BDA0001690148150000075
From (6), two inequality equation sets (7) and (8) can be obtained
Figure BDA0001690148150000076
Figure BDA0001690148150000077
According to (7), the controller output at the moment is obtained to meet the requirement
d＞max(0.5,dmin+c,dmax-c) (9)
According to (8), the
Figure BDA0001690148150000078
(4) The simultaneous (5) and (10) obtaining a duty cycle bias signal of
Figure BDA0001690148150000081
Generally, c is taken as
Figure BDA0001690148150000082
(5) A sawtooth carrier CW is generated in the control system.
(6) Calculating voltage control deviation according to the output voltage detected by the voltage sensor, and sending the calculated voltage control deviation to the voltage controller GvAnd calculating to obtain a control signal d.
(7) Applying a positive bias c to the control signal d to obtain d1D + c. Applying a negative bias c to the control signal d to obtain d2＝d-c。
(8) Using sawtooth carriers CW for d1And d2Modulating to obtain respectively-driven switch tubes S1And S2The pulse signal of (2).
And if the expected control effect is not achieved, returning to the corresponding design steps in (1) to (8) until a satisfactory actual result is obtained.

Claims (5)

1. A method of controlling the operating mode of a Buck-Boost converter by duty cycle biasing, comprising the steps of:
(1) defining the minimum duty ratio d allowed by the work of two switching tubes of the Buck-Boost converterminAnd a maximum duty cycle dmax；
(2) Determining a duty ratio bias signal c of the Buck-Boost converter which can be in single-tube Buck step-down operation in the input voltage variation range according to the variation range of the input side direct-current power supply voltage and the expected output voltage value1；
(3) Determining a duty ratio bias signal c of the Buck-Boost converter which can be in single-tube Boost operation in the input voltage variation range according to the variation range of the input side direct-current power supply voltage and an expected output voltage value2；
(4) According to two bias signals c obtained under the condition of meeting the single-tube Buck and single-tube Boost1、c2Taking the maximum value as the duty ratio bias of the Buck-Boost converterA signal c;
(5) generating a train of sawtooth carriers CW in a control system in accordance with an output voltage command vo*With the actual voltage v detected by the voltage sensor VSoThe difference is fed to a voltage regulator GvCalculating to obtain a duty ratio control signal d;
(6) applying a positive bias c to the control signal d to obtain d1D + c, by applying a negative bias c to the control signal d2＝d-c；
(7) Using sawtooth carriers CW for d1And d2Modulating to obtain respectively-driven switch tubes S1And S2The pulse signal of (2).
2. The method according to claim 1, wherein the minimum duty cycle and the maximum duty cycle allowed by the operation of two switching tubes of the Buck-Boost converter are respectively defined as dminAnd dmaxThe method comprises the following steps:
Figure FDA0002293650340000011
wherein d is1Is S1Duty ratio of the tube, d2Is S2Duty cycle of the tube, when the actual duty cycle of the tube is greater than dmaxThe tube is in a full conduction state, and the duty ratio is 1; when the actual duty cycle of the tube is less than dminThe tube will be in a fully off state with a duty cycle of 0.
3. The method according to claim 1, characterized in that the duty ratio bias signal c for determining that the Buck-Boost converter can be in single-tube Buck step-down operation in the input voltage variation range is determined according to the variation range of the input side direct current power supply voltage and the expected output voltage value1The method comprises the following steps:
if the Buck-Boost converter is in a single-tube Buck mode, S is1Chopping wave, S2Off, then in its inductor current iLIn the continuous case have
Figure FDA0002293650340000012
The following two inequality equation sets can be obtained according to the inequality equation set
Figure FDA0002293650340000013
Figure FDA0002293650340000021
Controller output needs to be satisfied
d＜min(0.5,dmin+c1,dmax-c1)
Figure FDA0002293650340000022
Wherein v isoFor the actual voltage, v, detected by the voltage sensor VSinmaxIs the maximum voltage of the front end DC power supply, d is the output voltage command vo*With the actual voltage v detected by the voltage sensor VSoThe difference is fed to a voltage regulator GvDuty ratio control signal obtained by calculation, dmaxAt maximum duty cycle, dminIs the minimum duty cycle, c1The method is a duty ratio bias signal which can be used for a single-tube Buck step-down operation of the Buck-Boost converter in an input voltage variation range.
4. The method according to claim 1, characterized in that the duty ratio bias signal c for determining that the Buck-Boost converter can be in single-tube Boost operation in the input voltage variation range is determined according to the variation range of the input side direct current power supply voltage and the expected output voltage value2The method comprises the following steps:
if the Buck-Boost converter is in a single-tube Boost mode, namely S2Chopping wave, S1On conduction, then in its inductive current iLIn the continuous case have
Figure FDA0002293650340000023
The following two inequality equation sets can be obtained according to the inequality equation set
Figure FDA0002293650340000024
Figure FDA0002293650340000025
Controller output needs to be satisfied
d＞max(0.5,dmin+c2,dmax-c2)
Figure FDA0002293650340000026
Wherein v isoFor the actual voltage, v, detected by the voltage sensor VSinminIs the minimum voltage of the front end DC power supply, d is the command according to the output voltage
Figure FDA0002293650340000027
With the actual voltage v detected by the voltage sensor VSoThe difference is fed to a voltage regulator GvDuty ratio control signal obtained by calculation, dmaxAt maximum duty cycle, dminIs the minimum duty cycle, c2The method is a duty ratio bias signal which can be used for a Buck-Boost converter in a single-tube Boost operation in an input voltage variation range.
5. The method according to claim 1, wherein the taking the maximum value of two bias signals obtained under the condition that the single-tube Buck and the single-tube Boost are satisfied as a duty ratio bias signal c of the Buck-Boost converter comprises the following steps:
duty cycle bias signal of
Figure FDA0002293650340000031
Taking c as
Figure FDA0002293650340000032
Wherein c is c1And c2Maximum value between, vinminIs the minimum voltage value, v, of its front-end DC power supplyoFor the actual voltage detected by the voltage sensor VS, dmaxAt maximum duty cycle, dminIs the minimum duty cycle.
CN201810589269.6A 2018-06-08 2018-06-08 Method for controlling operation mode of Buck-Boost converter through duty ratio bias Active CN108768170B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810589269.6A CN108768170B (en) 2018-06-08 2018-06-08 Method for controlling operation mode of Buck-Boost converter through duty ratio bias

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810589269.6A CN108768170B (en) 2018-06-08 2018-06-08 Method for controlling operation mode of Buck-Boost converter through duty ratio bias

Publications (2)

Publication Number Publication Date
CN108768170A CN108768170A (en) 2018-11-06
CN108768170B true CN108768170B (en) 2020-04-07

Family

ID=64000717

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810589269.6A Active CN108768170B (en) 2018-06-08 2018-06-08 Method for controlling operation mode of Buck-Boost converter through duty ratio bias

Country Status (1)

Country Link
CN (1) CN108768170B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110429847B (en) * 2019-08-19 2021-05-04 西安爱科赛博电气股份有限公司 Method and circuit for generating driving signals of switching tubes of double Buck inverters
CN111092549B (en) * 2019-11-27 2021-11-16 南京航空航天大学 Three-mode frequency conversion soft switching control method of four-tube Buck-Boost converter
CN116526848B (en) * 2023-06-30 2024-02-20 广东高斯宝电气技术有限公司 Control method for seamless switching of four-switch Buck-Boost converter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102136797A (en) * 2010-09-08 2011-07-27 上海岩芯电子科技有限公司 Modulating method for noninverting Buck-Boost power inverter
CN103036431A (en) * 2012-11-28 2013-04-10 南京信息工程大学 Cascade type buck-boost converter input side current control method
CN103066842A (en) * 2012-12-14 2013-04-24 南京航空航天大学 Non-reverse polarity Buck-Boost converter combination modulation method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5728433B2 (en) * 2012-06-11 2015-06-03 株式会社東芝 DC-DC conversion circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102136797A (en) * 2010-09-08 2011-07-27 上海岩芯电子科技有限公司 Modulating method for noninverting Buck-Boost power inverter
CN103036431A (en) * 2012-11-28 2013-04-10 南京信息工程大学 Cascade type buck-boost converter input side current control method
CN103066842A (en) * 2012-12-14 2013-04-24 南京航空航天大学 Non-reverse polarity Buck-Boost converter combination modulation method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
A High-Efficiency Linear RF Power Amplifier With a Power-Tracking Dynamically Adaptive Buck-Boost Supply;Biranchinath Sahu 等;《IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》;20040131;第52卷(第1期);第112-120页 *
双输入Buck变换器的交错双沿调制方法;李艳 等;《电工技术学报》;20090430;第24卷(第4期);第139-146页 *

Also Published As

Publication number Publication date
CN108768170A (en) 2018-11-06

Similar Documents

Publication Publication Date Title
CN111092549B (en) Three-mode frequency conversion soft switching control method of four-tube Buck-Boost converter
CN101674016B (en) Power supply device and current sharing control method
CN108768170B (en) Method for controlling operation mode of Buck-Boost converter through duty ratio bias
CN110112913B (en) Direct current converter model prediction control method based on Fal function filter
CN103872920A (en) Leakage inductance current slope direct control method of isolation type two-way three-level converter
TW201725837A (en) Dual-constant-time buck-boost switching regulator and control circuit and method thereof
CN112865532B (en) Control circuit of four-switch buck-boost converter
CN110380613B (en) PWM (pulse-width modulation) plus phase shift control method for realizing ZVS (zero voltage switching) of four-tube converter
CN109980918B (en) Reverse coupling high-gain boosting Cuk circuit and fuzzy control method thereof
CN108696125B (en) Buck-Boost converter control method with duty ratio bias
CN101702587A (en) Control circuit capable of increasing power factor and revising load response
CN109494989B (en) Low-power voltage compensation combined DC/DC converter circuit and working method thereof
CN110912405A (en) Four-switch buck-boost converter based on voltage mode control
CN115642805A (en) ZVS-based six-switch buck-boost converter
WO2015154563A1 (en) Conversion circuit for direct-current switch power supply
CN111245231A (en) Boost mode constant voltage control method and circuit of soft switch bidirectional direct current converter
CN101071991A (en) Switch power for reducing output ripple
CN112994190A (en) Control method and control device of photovoltaic charging module
CN115425851B (en) Control method of LLC resonant converter
CN115693632B (en) Control method for DC micro-grid power oscillation suppression device
CN106533210A (en) Single-phase buck-boost AC-DC converter and control method thereof
Mukherjee et al. Automotive LED driver based on resonant DC-DC converter with wide input and output voltage ranges
CN115811229A (en) Four-switch Buck-Boost bidirectional control method
CN111865064A (en) CRM (customer relationship management) buck-boost converter controlled by segmented fixed conduction time
CN110943616B (en) Buck/Boost circuit soft switch PWM-PFM control system and control method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant