CN116961426A - Control method and system of double-tube buck-boost converter - Google Patents
Control method and system of double-tube buck-boost converter Download PDFInfo
- Publication number
- CN116961426A CN116961426A CN202310943226.4A CN202310943226A CN116961426A CN 116961426 A CN116961426 A CN 116961426A CN 202310943226 A CN202310943226 A CN 202310943226A CN 116961426 A CN116961426 A CN 116961426A
- Authority
- CN
- China
- Prior art keywords
- current
- thre
- double
- boost converter
- dynamic
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- AYFVYJQAPQTCCC-GBXIJSLDSA-N L-threonine Chemical compound C[C@@H](O)[C@H](N)C(O)=O AYFVYJQAPQTCCC-GBXIJSLDSA-N 0.000 claims abstract description 90
- 230000000052 comparative effect Effects 0.000 claims abstract description 7
- 238000005070 sampling Methods 0.000 claims description 35
- 230000000737 periodic effect Effects 0.000 claims description 26
- 230000001939 inductive effect Effects 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 abstract description 12
- 238000010586 diagram Methods 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
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
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/327—Means for protecting converters other than automatic disconnection against abnormal temperatures
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The application discloses a control method of a double-tube buck-boost converter, which sets a dynamic switching demarcation current I THRE Collecting the ambient temperature t of the double-tube buck-boost converter, and dynamically switching the demarcation current I according to the ambient temperature THRE Updated judgment current SI by dynamic adjustment of (a) THRE Collecting inductance current of a double-tube buck-boost converter and obtaining comparative inductance current I k By comparing inductor current I k And determining the current SI THRE And comparing to obtain a judging signal to control a switching tube of the double-tube buck-boost converter. The application can dynamically update and compare according to the ambient temperature to realize the control of the converter, meet the adjustment requirement of adapting to the temperature difference, and ensure the normal operation of the system under the conditions of extremely cold and high temperature. The system cost is controlled, the requirement of accurately judging the working state of the circuit can be met without introducing an external circuit, synchronous rectification control is realized, and the system operation is stable and efficient.
Description
Technical Field
The application relates to a control method and a control system of a double-tube buck-boost converter, and belongs to the technical field of synchronous rectification control.
Background
In the application of charge and discharge control of an energy storage battery, a buck-boost circuit based on a double tube is a power topology of the main stream of a high-voltage energy storage system in the market at present. As shown in fig. 1, which is a circuit diagram of a double-tube buck-BOOST converter, taking a BOOST state as an example, when the inductor current is larger and the double-tube operates in a CCM mode, the double-tube operates in a synchronous rectification mode, the Q2 tube is turned on in a freewheel phase, and the freewheel current passes through the Q2 tube instead of passing through the body diode of the Q1 tube, and because the conduction voltage drop of the body diode is larger, the conversion efficiency of the system can be remarkably improved; when the current is small and the CDM mode is operated, the synchronous rectification mode is opened by mistake, so that the current is reversed, and risks such as damage to components and the like are caused. Therefore, how to judge whether to turn on synchronous rectification is the key of safe, stable and efficient operation of the buck-boost converter based on the double tube.
In the traditional mode, the voltage or current of a switching tube is generally detected through a hardware circuit to control, the voltage or current is measured to judge the switching control, the hardware circuit is high in setting cost, meanwhile, the judging standard is fixed, the converter is arranged in the inverter, the inverter is generally affected by a large temperature difference, the lowest working temperature is generally-25 ℃, when the environment temperature is lower than-25 ℃, the electrolytic capacitor in the machine is reduced due to the annual increase of electrolyte, the conductivity is reduced, and the capacitance is reduced. When the capacitance of the electrolytic capacitor of the system is reduced, control decoupling of DC-DC and DC-AC can be affected, and the system is unstable.
Disclosure of Invention
The application aims to solve the defects of the prior art, and provides a control method and a control system of a double-tube buck-boost converter, aiming at the problems that the traditional additional circuit judging system is high in cost and cannot realize dynamic adjustment.
In order to achieve the above purpose, the technical scheme adopted by the application is as follows:
a control method of a double-tube buck-boost converter,
setting dynamic switching demarcation current I THRE ，
Collecting the ambient temperature t of the double-tube buck-boost converter, and dynamically switching the demarcation current I according to the ambient temperature THRE Updated judgment current SI by dynamic adjustment of (a) THRE ，
Inductance of acquisition double-tube buck-boost converterCurrent and obtain comparative inductor current I k By comparing inductor current I k And determining the current SI THRE And comparing to obtain a judging signal to control a switching tube of the double-tube buck-boost converter.
Preferably, the reference temperature T and the dynamic variable current DeltaI are set STEP ，
SI when the ambient temperature is higher than the reference temperature THRE ＝I THRE －ΔI STEP ，
SI when the ambient temperature is higher than the reference temperature THRE ＝I THRE +ΔI STEP 。
Preferably, a floating variable equation is established in terms of the reference temperature: ΔI STEP ＝Iva*(t-T)*δ ∣t-T∣ ，
Judging the current SI THRE ＝I THRE +ΔI STEP Where Iva is the variable current, delta ∣t-T∣ Is the adjustment coefficient corresponding to the temperature difference.
Preferably, the judgment current SI is set THRE The threshold interval of (2) is I MAX ～I MIN Wherein I MAX For maximum inductor current value during full operation of the double-tube buck-boost converter, I MIN Is 0.
Preferably, the inductor current is periodically collected to obtain the maximum current I in a single periodic sample N With maximum current I N The last non-0 current I thereafter M Calculating a drop current difference I Delta ，I Delta ＝(I N -I M ) /(M-N), where N is I N The number of bits in the periodic sampling, M being I M The number of bits in the periodic sampling is,
calculating and comparing inductor current I k ，I k ＝I end －I Delta Wherein I end For the last sample current in the periodic samples.
The application also provides a control system of the double-tube buck-boost converter, which comprises:
a dynamic operation unit for setting dynamic switching demarcation current I THRE ，
The temperature sampling module is used for collecting the ambient temperature t of the double-tube buck-boost converter, the temperature sampling module is communicated with the dynamic operation unit,
the dynamic operation unit comprises an updating dynamic module, and the updating dynamic module is used for dynamically switching the demarcation current I according to the ambient temperature THRE Updated judgment current SI by dynamic adjustment of (a) THRE ，
The current sampling module is used for collecting the inductance current of the double-tube buck-boost converter and obtaining a comparison inductance current I k The current adoption module is communicated and connected with the dynamic operation unit,
the dynamic operation unit comprises a comparison module and a driving module, wherein the comparison module is used for comparing the inductive current I k And determining the current SI THRE And comparing to obtain a judging signal, wherein the driving module is used for controlling a switching tube of the double-tube buck-boost converter according to the judging signal.
Preferably, the update dynamic module is provided with a dynamic variable part and an operation part, wherein the dynamic variable part is used for setting the reference temperature T and the dynamic variable current delta I STEP ，
The arithmetic unit is used for SI THRE The calculation is performed such that,
SI when the ambient temperature is higher than the reference temperature THRE ＝I THRE －ΔI STEP ，
SI when the ambient temperature is higher than the reference temperature THRE ＝I THRE +ΔI STEP 。
Preferably, the dynamic variable part is provided with a variable model, and the variable model is used for establishing a floating variable formula according to the reference temperature: ΔI STEP ＝Iva*(t-T)*δ ∣t-T∣ ，
The arithmetic unit is used for performing SI according to the variable model THRE The calculation is performed such that,
judging the current SI THRE ＝I THRE +ΔI STEP Where Iva is the variable current, delta ∣t-T∣ Is the adjustment coefficient corresponding to the temperature difference.
Preferably, a judgment current threshold control part is arranged in the update dynamic module,
the judgment current threshold control part is used for setting the judgment current SI THRE The threshold interval of (2), the threshold interval is I MAX ～I MIN Wherein I MAX For maximum inductor current value during full operation of the double-tube buck-boost converter, I MIN Is 0.
Preferably, the current sampling module comprises a periodic acquisition part and a current calculation part,
the periodic acquisition part is used for periodically acquiring the inductance current,
the current calculation part is used for calculating and obtaining comparative inductance current I k Obtaining maximum current I in a single period sample N With maximum current I N The last non-0 current I thereafter M Calculating a drop current difference I Delta ，I Delta ＝(I N -I M ) /(M-N), where N is I N The number of bits in the periodic sampling, M being I M The number of bits in the periodic sampling is,
calculating and comparing inductor current I k ，I k ＝I end －I Delta Wherein I end For the last sample current in the periodic samples.
The beneficial effects of the application are mainly as follows:
1. the control of the converter can be realized by dynamic updating and comparison according to the ambient temperature, the adjustment requirement of the adaptive temperature difference is met, and the normal operation of the system is ensured under the conditions of extremely cold and high temperature.
2. The system cost is controlled, the requirement of accurately judging the working state of the circuit can be met without introducing an external circuit, synchronous rectification control is realized, and the system operation is stable and efficient.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
fig. 1 is a circuit diagram of a prior art dual-transistor buck-boost converter.
Fig. 2 is a flow chart of a control method of the double-tube buck-boost converter of the present application.
Fig. 3 is a schematic diagram of a flow of judging current dynamic update in the control method of the dual-tube buck-boost converter.
Fig. 4 is a graph of a judgment current dynamic update in the control method of the double-tube buck-boost converter of the present application.
Fig. 5 is a schematic diagram of current sampling in the control method of the dual-transistor buck-boost converter of the present application.
Fig. 6 is a schematic structural diagram of a control system of the dual-tube buck-boost converter of the present application.
Fig. 7 is a schematic diagram of a dual-transistor driving in BOOST mode in the control system of the dual-transistor buck-BOOST converter of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the present application are shown in the drawings. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
The application provides a control method of a double-tube buck-boost converter, as shown in figure 2, a dynamic switching demarcation current I is set THRE Collecting the ambient temperature t of the double-tube buck-boost converter, and dynamically switching the demarcation current I according to the ambient temperature THRE Updated judgment current SI by dynamic adjustment of (a) THRE Double tube of collectionInductor current of buck-boost converter and obtaining comparative inductor current I k By comparing inductor current I k And determining the current SI THRE And comparing to obtain a judging signal to control a switching tube of the double-tube buck-boost converter.
The specific implementation process and principle description:
first, a dynamic switching demarcation current I is set THRE Then dynamically switching the demarcation current I according to the collected ambient temperature t of the double-tube buck-boost converter THRE Is updated to obtain the judgment current SI THRE 。
Then the inductance current of the double-tube buck-boost converter is acquired and a comparison inductance current I is obtained k By comparing inductor current I k And determining the current SI THRE Comparing to obtain judging signal, I k Not higher than the judgment current SI THRE Then the switch tube is controlled to open synchronous rectification, I k Higher than the judgment current SI THRE The switching tube is controlled to turn off synchronous rectification.
It should be noted that, the dual-tube buck-boost converter generally outputs a control signal through a PWM driving module, the PWM driving module calculates a duty ratio and a judgment signal of a switching tube, and outputs the control output to the driving tube through an and gate mode, thereby meeting the synchronous rectification control requirement.
Example 1
Setting a reference temperature T and a dynamic variable current delta I STEP SI when the ambient temperature is higher than the reference temperature THRE ＝I THRE －ΔI STEP SI when the ambient temperature is higher than the reference temperature THRE ＝I THRE +ΔI STEP 。
As shown in fig. 3, after the start of operation, an ambient temperature T is acquired, and the ambient temperature T is compared with a reference temperature T to perform SI THRE Calculation and then I k And determining the current SI THRE The comparison takes control output.
Typically, the reference temperature T is 20 ℃ + -5 ℃.
Example two
Establishing a floating variable formula according to a reference temperature: ΔI STEP ＝Iva*(t-T)*δ ∣t-T∣ Judging the current SI THRE ＝I THRE +ΔI STEP Where Iva is the variable current, delta ∣t-T∣ Is the adjustment coefficient corresponding to the temperature difference.
As shown in fig. 4, for the adjustment curve, the variable current Iva is the fixed data set, the positive and negative calculations are obtained from the calculation value of (T-T), and the adjustment coefficient corresponding to the temperature difference is used for the bidirectional incremental operation, referring to fig. 4, the environment temperature 30 ℃ and the environment temperature 40 ℃ are according to delta ∣t-T∣ Is adjusted to satisfy curvature control with ambient temperature change so that SI THRE The dynamic change of (c) is more accurate.
Setting a judgment current SI THRE The threshold interval of (2) is I MAX ～I MIN Wherein I MAX For maximum inductor current value during full operation of the double-tube buck-boost converter, I MIN Is 0.
I.e. SI THRE There is a variable range which cannot exceed the I of the circuit itself MAX When its calculation exceeds I MAX At the time of the SI THRE ＝I MAX 。
In a particular embodiment, the inductor current is periodically sampled to obtain the maximum current I in a single periodic sample N With maximum current I N The last non-0 current I thereafter M Calculating a drop current difference I Delta ，I Delta ＝(I N -I M ) /(M-N), where N is I N The number of bits in the periodic sampling, M being I M The bit times in the periodic sampling are used for calculating and comparing the inductance current I k ，I k ＝I end －I Delta Wherein I end For the last sample current in the periodic samples.
Specifically, the acquisition ADC module has 16 paths of sampling channels, namely channels 0 to 15. Each even sampling channel (channel 0, channel 2, channel 4, … …) is configured for inductor current sampling. In each PWM period, the inductance electricity can be sampled for 8 times on averageStreams, respectively denoted as I 1 、I 2 ...I 7 . The entire sampling timing is shown in fig. 4.
In each PWM interrupt, the current sampling process and mode determination are as shown in fig. 5. Taking the BOOST mode of operation as an example, the BUCK mode of operation is similar.
At inductor current I 1 、I 2 ...I 7 Find maximum current I N The method comprises the steps of carrying out a first treatment on the surface of the At I N After that, the final non-0 current is I M The method comprises the steps of carrying out a first treatment on the surface of the Calculating a step-down current difference I Delta ＝(I N -I M ) /(M-N); calculating and comparing inductor current I k ，I k ＝I end －I Delta If I k Not higher than SI THRE Is used for turning on the synchronous rectification function; if I k Higher than SI THRE To turn on the synchronous rectification function.
A control system for a double-tube buck-boost converter, as shown in fig. 6, the system comprising: a dynamic operation unit for setting dynamic switching demarcation current I THRE The temperature sampling module is used for collecting the ambient temperature t of the double-tube buck-boost converter, the temperature sampling module is communicated with the dynamic operation unit, the dynamic operation unit comprises an updating dynamic module, and the updating dynamic module is used for dynamically switching the demarcation current I according to the ambient temperature THRE Updated judgment current SI by dynamic adjustment of (a) THRE The current sampling module is used for collecting the inductance current of the double-tube buck-boost converter and obtaining a comparison inductance current I k The current utilization module is communicated with the dynamic operation unit, the dynamic operation unit comprises a comparison module and a driving module, and the comparison module is used for comparing the inductance current I k And determining the current SI THRE And comparing to obtain a judging signal, wherein the driving module is used for controlling a switching tube of the double-tube buck-boost converter according to the judging signal.
Specifically, the general dynamic operation unit is arranged in the controller DSP, and the controller DSP is provided with a PWM driving module which is communicated with the switching tube driving circuit.
The temperature sampling module can collect temperature through the temperature sampling circuit,the current sampling module can sample inductance current through the current sampling circuit. The update dynamic module judges the current SI according to the acquired temperature information THRE After the comparison module judges, the PWM driving module executes the switching signal of the switching tube to the switching tube driving circuit.
As shown in fig. 7, the driving of the dual-tube driving schematic diagram in the BOOST mode is realized through the internal comparator and the and gate, so that the comparison and judgment of the driving execution is satisfied.
In a specific embodiment, a dynamic variable part and an operation part are arranged in the updating dynamic module, and the dynamic variable part is used for setting the reference temperature T and the dynamic variable current delta I STEP The arithmetic unit is used for SI THRE Calculating, when the ambient temperature is higher than the reference temperature, SI THRE ＝I THRE －ΔI STEP SI when the ambient temperature is higher than the reference temperature THRE ＝I THRE +ΔI STEP 。
In this embodiment, the arithmetic unit is generally used to perform the arithmetic of the fixation judgment.
In a specific embodiment, the dynamic variable part is provided with a variable model, and the variable model is used for establishing a floating variable formula according to the reference temperature: ΔI STEP ＝Iva*(t-T)*δ ∣t-T∣ The operation unit is used for performing SI according to the variable model THRE Calculating and judging current SI THRE ＝I THRE +ΔI STEP Where Iva is the variable current, delta ∣t-T∣ Is the adjustment coefficient corresponding to the temperature difference.
Namely, accurately judging the current dynamic update through the variable model.
In a specific embodiment, the update dynamic module is provided with a judgment current threshold control part for setting the judgment current SI THRE The threshold interval of (2), the threshold interval is I MAX ～I MIN Wherein I MAX For maximum inductor current value during full operation of the double-tube buck-boost converter, I MIN Is 0.
In one embodiment, the current sampling module comprises a periodic acquisition part and a ammeterA calculating part, a periodic acquisition part for periodically acquiring the inductance current, and a current calculating part for calculating and obtaining the comparative inductance current I k Obtaining maximum current I in a single period sample N With maximum current I N The last non-0 current I thereafter M Calculating a drop current difference I Delta ，I Delta ＝(I N -I M ) /(M-N), where N is I N The number of bits in the periodic sampling, M being I M The bit times in the periodic sampling are used for calculating and comparing the inductance current I k ，I k ＝I end －I Delta Wherein I end For the last sample current in the periodic samples.
Through the above description, the control method and the control system of the double-tube buck-boost converter can realize the control of the converter by dynamically updating and comparing according to the ambient temperature, meet the adjustment requirement of adapting to the temperature difference, and ensure the normal operation of the system under extremely cold and high temperature conditions. The system cost is controlled, the requirement of accurately judging the working state of the circuit can be met without introducing an external circuit, synchronous rectification control is realized, and the system operation is stable and efficient.
The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus/apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus/apparatus.
Thus far, the technical solution of the present application has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present application is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present application, and such modifications and substitutions will fall within the scope of the present application.
Claims (10)
1. The control method of the double-tube buck-boost converter is characterized by comprising the following steps of:
setting dynamic switching demarcation current I THRE ，
Collecting the ambient temperature t of the double-tube buck-boost converter, and dynamically switching the demarcation current I according to the ambient temperature THRE Updated judgment current SI by dynamic adjustment of (a) THRE ，
Collecting inductance current of double-tube buck-boost converter and obtaining comparative inductance current I k By comparing inductor current I k And determining the current SI THRE And comparing to obtain a judging signal to control a switching tube of the double-tube buck-boost converter.
2. The control method of the double-tube buck-boost converter according to claim 1, wherein:
setting a reference temperature T and a dynamic variable current delta I STEP ，
SI when the ambient temperature is higher than the reference temperature THRE ＝I THRE －ΔI STEP ，
SI when the ambient temperature is higher than the reference temperature THRE ＝I THRE +ΔI STEP 。
3. The control method of the double-tube buck-boost converter according to claim 2, wherein:
establishing a floating variable formula according to a reference temperature: ΔI STEP ＝Iva*(t-T)*δ ∣t-T∣ ，
Judging the current SI THRE ＝I THRE +ΔI STEP Where Iva is the variable current, delta ∣t-T∣ Is the adjustment coefficient corresponding to the temperature difference.
4. The control method of the double-tube buck-boost converter according to claim 2, wherein:
setting a judgment current SI THRE The threshold interval of (2) is I MAX ～I MIN Wherein I MAX For maximum inductor current value during full operation of the double-tube buck-boost converter, I MIN Is 0.
5. The control method of the double-tube buck-boost converter according to claim 1, wherein:
periodically collecting inductance current to obtain maximum current I in single period sampling N With maximum current I N The last non-0 current I thereafter M Calculating a drop current difference I Delta ，I Delta ＝(I N -I M ) /(M-N), where N is I N The number of bits in the periodic sampling, M being I M The number of bits in the periodic sampling is,
calculating and comparing inductor current I k ，I k ＝I end －I Delta Wherein I end For the last sample current in the periodic samples.
6. A control system for a dual-tube buck-boost converter, comprising:
a dynamic operation unit for setting dynamic switching demarcation current I THRE ，
The temperature sampling module is used for collecting the ambient temperature t of the double-tube buck-boost converter, the temperature sampling module is communicated with the dynamic operation unit,
the dynamic operation unit comprises an updating dynamic module, and the updating dynamic module is used for dynamically switching the demarcation current I according to the ambient temperature THRE Updated judgment current SI by dynamic adjustment of (a) THRE ，
The current sampling module is used for collecting the inductance current of the double-tube buck-boost converter and obtaining a comparison inductance current I k The current adoption module is communicated and connected with the dynamic operation unit,
the dynamic operation unit comprises a comparison module and a driving module, wherein the comparison module is used for comparing the inductive current I k And determining the current SI THRE And comparing to obtain a judging signal, wherein the driving module is used for controlling a switching tube of the double-tube buck-boost converter according to the judging signal.
7. According to claim 6, a control system of a double-tube buck-boost converter is characterized in that:
the dynamic updating module is internally provided with a dynamic variable part and an operation part, wherein the dynamic variable part is used for setting a reference temperature T and a dynamic variable current delta I STEP ，
The arithmetic unit is used for SI THRE The calculation is performed such that,
SI when the ambient temperature is higher than the reference temperature THRE ＝I THRE －ΔI STEP ，
SI when the ambient temperature is higher than the reference temperature THRE ＝I THRE +ΔI STEP 。
8. The control system of the double-tube buck-boost converter according to claim 7, wherein:
the dynamic variable part is provided with a variable model which is used for establishing a floating variable formula according to the reference temperature: ΔI STEP ＝Iva*(t-T)*δ ∣t-T∣ ，
The arithmetic unit is used for performing SI according to the variable model THRE The calculation is performed such that,
judging the current SI THRE ＝I THRE +ΔI STEP Where Iva is the variable current, delta ∣t-T∣ Is the adjustment coefficient corresponding to the temperature difference.
9. The control system of the double-tube buck-boost converter according to claim 7, wherein:
a judgment current threshold control part is arranged in the update dynamic module,
the judgment current threshold control part is used for setting the judgment current SI THRE The threshold interval of (2), the threshold interval is I MAX ～I MIN Wherein I MAX For maximum inductor current value during full operation of the double-tube buck-boost converter, I MIN Is 0.
10. According to claim 6, a control system of a double-tube buck-boost converter is characterized in that:
the current sampling module comprises a periodic acquisition part and a current calculation part,
the periodic acquisition part is used for periodically acquiring the inductance current,
the current calculation part is used for calculating and obtaining comparative inductance current I k Obtaining maximum current I in a single period sample N With maximum current I N The last non-0 current I thereafter M Calculating a drop current difference I Delta ，I Delta ＝(I N -I M ) /(M-N), where N is I N The number of bits in the periodic sampling, M being I M The number of bits in the periodic sampling is,
calculating and comparing inductor current I k ，I k ＝I end －I Delta Wherein I end For the last sample current in the periodic samples.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310943226.4A CN116961426A (en) | 2023-07-28 | 2023-07-28 | Control method and system of double-tube buck-boost converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310943226.4A CN116961426A (en) | 2023-07-28 | 2023-07-28 | Control method and system of double-tube buck-boost converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116961426A true CN116961426A (en) | 2023-10-27 |
Family
ID=88448858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310943226.4A Pending CN116961426A (en) | 2023-07-28 | 2023-07-28 | Control method and system of double-tube buck-boost converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116961426A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105141133A (en) * | 2015-10-26 | 2015-12-09 | 南京信息工程大学 | MIT model reference adaptive control method for double-tube type booster and buck converter |
| CN111740583A (en) * | 2020-06-08 | 2020-10-02 | 南京航空航天大学 | Modal switching method and circuit for single-cycle control in hybrid conduction mode |
| CN113572359A (en) * | 2021-08-16 | 2021-10-29 | 上海电力大学 | Bidirectional buck-boost converter control method based on reduced-order active disturbance rejection strategy |
| CN116345906A (en) * | 2023-03-28 | 2023-06-27 | 苏州海鹏科技有限公司 | Control method based on bidirectional direct current converter circuit |
-
2023
- 2023-07-28 CN CN202310943226.4A patent/CN116961426A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105141133A (en) * | 2015-10-26 | 2015-12-09 | 南京信息工程大学 | MIT model reference adaptive control method for double-tube type booster and buck converter |
| CN111740583A (en) * | 2020-06-08 | 2020-10-02 | 南京航空航天大学 | Modal switching method and circuit for single-cycle control in hybrid conduction mode |
| CN113572359A (en) * | 2021-08-16 | 2021-10-29 | 上海电力大学 | Bidirectional buck-boost converter control method based on reduced-order active disturbance rejection strategy |
| CN116345906A (en) * | 2023-03-28 | 2023-06-27 | 苏州海鹏科技有限公司 | Control method based on bidirectional direct current converter circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102904444B (en) | DC/DC (direct-current/direct-current) conversion and control system based on proton exchange membrane fuel cell | |
| WO2019129270A1 (en) | Method for improving dynamic performance of synchronous rectifier primary-side feedback flyback power supply | |
| CN101197544A (en) | Wide region input and continuously adjustable non-bridge Buck-Boost PFC converter | |
| CN103840529B (en) | The solar charging/discharging control system controlled based on ARM and control method | |
| US20150188350A1 (en) | Power Storage and Supply System | |
| CN103312165A (en) | High-frequency multiphase interleaved conversion device and control method | |
| CN115189578A (en) | Isolated bidirectional charger CLLC converter control device and method | |
| CN109450254A (en) | A kind of control method of the intermittent mode of 2 stage converter | |
| CN114448249A (en) | Full-digital soft switching control circuit of four-switch buck-boost bidirectional converter | |
| CN114583952A (en) | Bidirectional direct current converter for energy storage system and control method thereof | |
| CN104702108A (en) | Critical continuous boost converter employing constant-frequency control | |
| CN104753350A (en) | Method used for prediction convergence control of inductive current in booster circuit | |
| Norouzi et al. | Stability analysis of variable frequency control method of soft switching for boost converter with wide bandgap semiconductors | |
| CN116961426A (en) | Control method and system of double-tube buck-boost converter | |
| CN219287377U (en) | Bidirectional DC conversion circuit and corresponding device | |
| CN108365761B (en) | DC constant voltage output converter | |
| CN108377099B (en) | Two-stage input boost DC constant voltage output converter | |
| CN114678943B (en) | Photovoltaic power generation energy storage circuit, control method and control system | |
| CN103547042B (en) | Based on the constant current driver circuit for LED of power factor correction | |
| CN204089592U (en) | A kind of novel wind-solar complementary step-up/step-down dc-dc converter | |
| CN115664169A (en) | Quasi-peak current control method for bidirectional four-switch Buck-Boost | |
| CN102761240B (en) | Power factor corrector realized in an intelligent embedded way and control method thereof | |
| CN112600432B (en) | Control method for predicting charge of LLC resonant converter | |
| CN114844322A (en) | Control method of DC-DC converter and control chip module thereof | |
| CN210111678U (en) | MPPT solar energy collecting circuit and solar energy equipment |
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 |