CN103036431A - Cascade type buck-boost converter input side current control method - Google Patents
Cascade type buck-boost converter input side current control method Download PDFInfo
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- CN103036431A CN103036431A CN2012104957003A CN201210495700A CN103036431A CN 103036431 A CN103036431 A CN 103036431A CN 2012104957003 A CN2012104957003 A CN 2012104957003A CN 201210495700 A CN201210495700 A CN 201210495700A CN 103036431 A CN103036431 A CN 103036431A
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- buck
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- current control
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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
- H02M3/1582—Buck-boost converters
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Abstract
The invention discloses a cascade type buck-boost converter input side current control method and belongs to the technical field of power electronics. The cascade type buck-boost converter input side current control method can complete control based on comparison between an input voltage and an output voltage of a converter. When the input voltage is lower than the output voltage, a switch tube of a boost converter is constantly conducted, and a first current control scheme is utilized to obtain a conduction duty ratio of the switch tube of the boost converter; and when the input voltage is higher than or equal to the output voltage, a switch tube of a buck converter is constantly cut off, and a second current control scheme is utilized to obtain a conduction duty ratio of the buck converter. The two switch tubes of the cascade type boost converter and the cascade type buck converter can be prevented from simultaneously working in a high-frequency state, system consumption is reduced, effective current control technology can be matched with a voltage boosting stage and a voltage reducing stage, and good input and output performances are achieved.
Description
Technical field
The invention discloses cascade type buck-boost converter input side current control method, belong to electric and electronic technical field.
Background technology
Over nearly 20 years, power electronic technology has obtained fast development, all kinds of power electronic equipments are widely applied in fields such as chemical industry, communications, divide from the electric energy transition form, this quasi-converter comprises DC-to-DC (being called for short DC-DC) converter, AC-DC (being called for short AC-DC) converter, and DC-AC (being called for short DC-AC) converter.If divide according to magnitude relationship between input, the output voltage, then comprise booster type (or being called the Boost type), voltage-dropping type (or being called the Buck type) and liter-voltage-dropping type.Wherein, liter-buck converter can dwindle the sampled value difference between input, the output voltage as far as possible, reaches to reduce circuit elements device voltage stress, improves the purpose of system effectiveness, has obtained in recent years various countries scholars' extensive concern.
At present, in having the single-phase invertor of boost function, single-tube comparatively commonly, comprise single tube buck-boost converter, Sepic, and Cuk converter etc., but the switch tube voltage of these converters, current stress, and the indexs such as efficient of converter are all not ideal enough.Given this, can reduce voltage, current stress, and the two-tube cascade connection type liter-buck converter that improves system effectiveness obtains the concern of Chinese scholars, specifically comprised two kinds of Buck+Boost framework and Boost+Buck frameworks.
For two-tube cascade connection type liter-buck converter, two switching tubes have synchronous working and two kinds of patterns of time-sharing work.Under the two switching tube synchronous working patterns, two Voltage loop, double-current ring control program and univoltage ring, double-current ring control program are arranged; Under the two switching tube time-sharing work patterns, one tunnel carrier modulation scheme, two carrier modulation scheme are arranged.Two voltages, double-current ring control program exist the intergrade capacitance voltage must be higher than output voltage, increase the defective of the voltage stress of switching tube, and then there are the problem that designs three loops in univoltage ring, double-current ring control program, and controller's design is difficulty comparatively.Under the two switching tube time-sharing work patterns, boost or the Average Current Control scheme that buck stage all adopts, this Current Control to boost phase is comparatively suitable, but be not good selection in buck stage, therefore, for guaranteeing that control system is stable, have to the hardware circuit parameter is made more multiple constraint, for example increase the filter inductance value.
Summary of the invention
Technical problem to be solved by this invention is the deficiency for the above-mentioned background technology, and cascade type buck-boost converter input side current control method is provided.
The present invention adopts following technical scheme for achieving the above object:
Cascade type buck-boost converter input side current control method according to the comparative result of cascade connection type converter input voltage and output voltage, is selected current control scheme, specifically comprises the steps:
When cascade type buck-boost converter input voltage during less than output voltage, enter step 3;
When the cascade type buck-boost converter input voltage is greater than or equal to output voltage, enter step 4;
Step 3, make all the time conducting of switching tube of buck converter part, the switching tube of booster converter is operated in the high frequency state, utilizes the first current control method to obtain the conducting duty ratio of the switching tube of booster converter part, realizes that input current is to the tracking of reference current;
Described cascade type buck-boost converter input side current control method: the first current control method described in the step 3 is the current control method that is applicable to the boost converter.
Described cascade type buck-boost converter input side current control method: the described the second current control method in the step 4 is the current control method that is applicable to the buck converter.
The present invention adopts technique scheme, has following beneficial effect: not only avoid two switching tubes of cascade type buck-boost converter to be operated in simultaneously the high frequency state, reduce system loss, can also guarantee boost, buck stage all mates more effective Current Control Technology, realizes good input, output performance.
Description of drawings
Fig. 1 is cascade type buck-boost converter input side current control circuit figure.
Fig. 2 is two-tube cascade connection type buck-boost converter topology figure.
Fig. 3 is that two-tube cascade connection type buck-boost converter topology figure equivalence is the circuit diagram of boost converter.
Fig. 4 is that two-tube cascade connection type buck-boost converter topology figure equivalence is the circuit diagram of buck converter.
Fig. 5 is the schematic diagram of the two-tube cascade connection type buck-boost converter input side current methods of control.
Fig. 6 is that two-tube cascade connection type buck-boost converter topology figure equivalence is the control schematic diagram behind the boost converter.
Fig. 7 is that two-tube cascade connection type buck-boost converter topology figure equivalence is the control schematic diagram behind the buck converter.
Fig. 8 is two-tube cascade connection type boost-buck convertor controls figure.
Fig. 9 is that two-tube cascade connection type boost-buck converter topology figure equivalence is the control schematic diagram behind the boost converter.
Figure 10 is that two-tube cascade connection type boost-buck converter topology figure equivalence is the control schematic diagram behind the buck converter.
Figure 11 is cascade connection type boost-buck AC-DC convertor controls figure.
Figure 12 is cascade connection type buck-boost AC-DC convertor controls figure.
Embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to invention:
As shown in Figure 1, (prime is boost to the present invention is directed to cascade connection type boost-buck converter, rear class is the buck converter) and cascade connection type buck-boost converter (prime is buck, and rear class is the boost converter), its input side current tracking reference current controlled.
The below take two-tube cascade connection type buck-boost converter as example illustrates implementation method of the present invention.Two-tube cascade connection type buck-boost converter topology can be considered as the 2 stage converter that prime buck and the cascade of rear class boost converter form as shown in Figure 2.
Employing block diagram is as shown in Figure 5 controlled the method for two-tube cascade connection type buck-boost converter input side electric current, specifically comprises the steps:
As cascade type buck-boost converter input voltage v
InLess than output voltage v
oThe time, enter step 3;
As cascade type buck-boost converter input voltage v
InBe greater than or equal to output voltage v
oThe time, enter step 4.
Step 3, make all the time conducting of switching tube S_bu of buck converter part, switching tube S_bo is operated in the HF switch state in the booster converter, can utilize the Average Current Control method to obtain the conducting duty ratio of the switching tube S_bo of booster converter part, cascade connection type buck-boost converter can equivalence be structure as shown in Figure 3.
For two-tube buck-boost DC-DC converter shown in Figure 2, as input voltage instantaneous value v
InWith output voltage instantaneous value v
oSatisfy v
In＜v
oThe time, for guaranteeing that input current can the track reference electric current, need to allow converter be operated in the boost pattern, the permanent conducting of buck converter this moment switching tube S_bu partly, the switching tube S_bo of booster converter part is operated in the HF switch state, control system as shown in Figure 6, this moment current control scheme 1 can adopt the Average Current Control method: for the converter output voltage control at reference value V
Ref(reference value V
RefBe set by the user), converter output voltage K samples first
vV
o, calculating voltage error amount, and error signal is carried out proportional integral regulate, PI controller output valve and the input voltage sampling value rear reference value i as input current that multiplies each other
* InThe reference value i of input current
* InInput current i with sampling
InAsk poor, and this error signal is carried out the proportional integral computing, the output of current controller is handed over the driving signal that intercepts booster converter switching tube S_bo as modulating wave with carrier wave.
For converter shown in Figure 2, work as v
In〉=v
oThe time, for realizing input current track reference electric current, need to allow converter be operated in the buck pattern, namely need to make permanent shutoff of switching tube S_bo of booster converter part, buck converter switching tube S_bu is operated in the HF switch state, the control system of this moment as shown in Figure 7, current control scheme 2 has adopted the electric charge control method: acquisition stream is crossed the current value of buck converter switching tube S_bu, and to capacitor C
TCharge, when flowing through capacitor C
TThe electricity electric current is greater than input current reference value i
* InThe time, turn-off buck converter switching tube S_bu, simultaneously to capacitor C
TCarry out repid discharge, until next switch periods initial time is again to capacitor C
TCharge.Current control scheme 2 can also adopt that other is applicable to the current control method of boost converter outside the electric charge control method.
The present invention also is applicable to two-tube cascade connection type boost-buck DC-DC converter, corresponding control system schematic diagram as shown in Figure 8, the boost-buck converter can be considered as the 2 stage converter that formed by prime boost and the cascade of rear class buck converter.The switching tube S_bu of buck converter part is in conducting state all the time, and when booster converter switching tube S_bo was in the HF switch state simultaneously, the cascade connection type converter can equivalence be structure as shown in Figure 9; And booster converter S_bo is in off state all the time, and when buck converter S_bu was in the HF switch state simultaneously, the cascade connection type converter can equivalence be structure shown in Figure 10 then.Be not difficult to find that Fig. 9 and two topologys shown in Figure 10 are respectively buck, the boost converter of outlet side, input side increase one-level LC filtering.
Except cascade type buck-boost DC-DC converter, the present invention also is applicable to cascade type buck-boost AC-DC converter.Cascade connection type boost-buck AC-DC convertor controls figure as shown in figure 11; Cascade connection type buck-boostAC-DC convertor controls figure as shown in figure 12.
By with the contrast of existing control method, can sum up the present invention and have following advantage:
(1) in two voltages, double-current ring control program and univoltage ring, double-current ring control program, two switching tubes of liter-buck converter always work in the HF switch state, to cause higher switching loss, affect system effectiveness, and the novel combination control program employing that proposes is here boosted, step-down is controlled at times, do not exist two switching tubes to be operated in simultaneously the situation of high frequency state, reduced switching loss;
(2) for cascade connection type boost-buck converter, when adopting novel combination control this programme, boost phase mid-stage voltage terminal voltage equals output voltage, in buck stage, the terminal voltage of intermediate capacitance is input voltage, and namely intermediate capacitance voltage is always in input voltage, the output voltage larger one.And when adopting two voltages, double-current ring control program and univoltage ring, double-current ring control program, no matter boost or buck stage, intermediate capacitance voltage all must be both greater than the input voltage maximum, also greater than output voltage.Therefore, adopt novel combination control program can reduce the voltage stress of switching tube;
(3) time-sharing work of level converters had avoided two switching tubes all to be operated in the HF switch state before and after a road traditional carrier modulation scheme, two carrier modulation scheme had realized, but boost, buck stage all adopted the Average Current Control technology.The Average Current Control technology is widely applied in the control of booster converter, also obtained good control effect, but this technology then seldom adopts in the control of buck convertor, reason is that the design of current controller is comparatively difficult, cause easily system unstable, and in fact, at the buck convertor control field, more efficiently Current Control Technology, for example the electric charge control program of generally acknowledging arranged.Therefore one tunnel carrier modulation scheme, two carrier modulation scheme are actually Current Control take the boost stage as main, objectively ignore the control program of buck stage control effect.The novel combination control program that the present invention proposes has been considered to boost, the buck stage transformer configuration, and the objective difference of Current Control aspect, has guaranteed that system boosting and buck stage can both match more effective Current Control Technology.
To sum up, novel combination control program in this paper can avoid two switching tubes of cascade type buck-boost converter (DC-DC and AC-DC) to be operated in simultaneously the high frequency state, reduce system loss, can also guarantee boost, buck stage all mates more effective Current Control Technology, realizes good input, output performance.
Claims (3)
1. cascade type buck-boost converter input side current control method is characterized in that the comparative result according to cascade connection type converter input voltage and output voltage, selects current control scheme, specifically comprises the steps:
Step 1 gathers the cascade type buck-boost converter output voltage, tries to achieve the difference of cascade type buck-boost converter output voltage reference value and output voltage sampled value with comparator;
Step 2 utilizes the described difference of step 1 to calculate the input side current reference value, compares input voltage and the output voltage of cascade type buck-boost converter again:
When cascade type buck-boost converter input voltage during less than output voltage, enter step 3;
When the cascade type buck-boost converter input voltage is greater than or equal to output voltage, enter step 4;
Step 3, make all the time conducting of switching tube of buck converter part, the switching tube of booster converter is operated in the high frequency state, utilizes the first current control method to obtain the conducting duty ratio of the switching tube of booster converter part, realizes that input current is to the tracking of reference current;
Step 4, the switching tube of booster converter part is turn-offed all the time, the switching tube of buck converter is operated in the high frequency state, utilizes the second current control method to obtain the switching tube conducting duty ratio of buck converter part, realizes that input current is to the tracking of reference current.
2. cascade type buck-boost converter input side current control method according to claim 1 is characterized in that the first current control method described in the step 3 is the current control method that is applicable to the boost converter.
3. cascade type buck-boost converter input side current control method according to claim 2 is characterized in that the described the second current control method in the step 4 is the current control method that is applicable to the buck converter.
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| CN2012104957003A CN103036431A (en) | 2012-11-28 | 2012-11-28 | Cascade type buck-boost converter input side current control method |
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| CN2012104957003A CN103036431A (en) | 2012-11-28 | 2012-11-28 | Cascade type buck-boost converter input side current control method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104600976A (en) * | 2013-10-31 | 2015-05-06 | 阳光电源股份有限公司 | Control method and control device of bidirectional DC/DC (Direct Current/Direct Current) converter cascade system |
| CN105471262A (en) * | 2014-09-25 | 2016-04-06 | 马克西姆综合产品公司 | Three phases controller for buck-boost regulators |
| CN106877722A (en) * | 2017-04-13 | 2017-06-20 | 盐城工学院 | A kind of highly reliable buck-boost grid-connected inverter |
| CN106972573A (en) * | 2017-04-24 | 2017-07-21 | 深圳市永联科技股份有限公司 | A kind of super capacitor charging system based on battery |
| CN108768170A (en) * | 2018-06-08 | 2018-11-06 | 哈尔滨工程大学 | A method of control One Buck-Boost converter body operational mode is biased by duty ratio |
| CN109120147A (en) * | 2018-09-17 | 2019-01-01 | 北方工业大学 | Buck-Boost circuit and cascade generation method |
| CN113949267A (en) * | 2021-10-19 | 2022-01-18 | 珠海智融科技股份有限公司 | Four-switch BUCKBOOST controller based on average current mode |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104600976A (en) * | 2013-10-31 | 2015-05-06 | 阳光电源股份有限公司 | Control method and control device of bidirectional DC/DC (Direct Current/Direct Current) converter cascade system |
| CN104600976B (en) * | 2013-10-31 | 2017-02-15 | 阳光电源股份有限公司 | Control method and control device of bidirectional DC/DC (Direct Current/Direct Current) converter cascade system |
| CN105471262A (en) * | 2014-09-25 | 2016-04-06 | 马克西姆综合产品公司 | Three phases controller for buck-boost regulators |
| CN105471262B (en) * | 2014-09-25 | 2019-11-08 | 马克西姆综合产品公司 | Three phase controllers for buck-boost regulators |
| CN106877722A (en) * | 2017-04-13 | 2017-06-20 | 盐城工学院 | A kind of highly reliable buck-boost grid-connected inverter |
| CN106972573A (en) * | 2017-04-24 | 2017-07-21 | 深圳市永联科技股份有限公司 | A kind of super capacitor charging system based on battery |
| CN108768170A (en) * | 2018-06-08 | 2018-11-06 | 哈尔滨工程大学 | A method of control One Buck-Boost converter body operational mode is biased by duty ratio |
| CN108768170B (en) * | 2018-06-08 | 2020-04-07 | 哈尔滨工程大学 | Method for controlling operation mode of Buck-Boost converter through duty ratio bias |
| CN109120147A (en) * | 2018-09-17 | 2019-01-01 | 北方工业大学 | Buck-Boost circuit and cascade generation method |
| CN113949267A (en) * | 2021-10-19 | 2022-01-18 | 珠海智融科技股份有限公司 | Four-switch BUCKBOOST controller based on average current mode |
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Application publication date: 20130410 |