CN101873071A - Minimum modulation method of full bridge-Boost DC converter inductive current pulsation - Google Patents
Minimum modulation method of full bridge-Boost DC converter inductive current pulsation Download PDFInfo
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- CN101873071A CN101873071A CN 201010215293 CN201010215293A CN101873071A CN 101873071 A CN101873071 A CN 101873071A CN 201010215293 CN201010215293 CN 201010215293 CN 201010215293 A CN201010215293 A CN 201010215293A CN 101873071 A CN101873071 A CN 101873071A
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Abstract
The invention discloses a minimum modulation strategy suitable for full bridge-Boost DC converter inductive current pulsation, which is used for improving the power density and efficiency of the full bridge-Boost converter. The full bridge-Boost DC converter comprises a full bridge unit and a Boost unit which can be independently controlled. In order to realize high efficiency, the full bridge unit generally adopts phase-shifting control to realize the soft switching of a switching tube thereof. The full bridge unit adopting phase-shifting control is divided into an advanced bridge arm and a lagging bridge arm, wherein the driving control signal of the advanced bridge arm switching tube can obtain a pulse signal composed of dead time thereof after passing through an NOR gate; the pulse width and the amplitude of the pulse signal both satisfy the requirement of the synchronizing signal, i.e. the pulse signal can serve as the synchronizing signal of a Boost unit switching tube so as to ensure that the Boost unit switching tube is put into operation when the advanced bridge arm switching tube of the full bridge unit is cut off, and inductive current pulsation is minimum right now.
Description
Technical field
Involved in the present invention is a kind of modulator approach of transformation of electrical energy device, is specially a kind of modulator approach that makes the DC converter inductive current pulsation minimum.
Background technology
Along with the development of power electronic technology, more and more higher to the requirement of transformation of electrical energy device, wherein the high power density of converting means and high efficiency always are the trend of Development of Power Electronic Technology.The volume of inductance is one of key factor that influences its power density in the converting means, and the size of inductive current pulsation directly influences the size of inductance value in the converting means, finally influences the power density of converting means; On the other hand, the conduction loss of switching tube is determined by the inductive current effective value in the converting means, and the inductive current effective value is made up of inductive current mean value and inductive current pulsation two parts, and promptly the size of inductive current pulsation also influences the efficient of converting means simultaneously.Reduce power density and efficient that inductive current pulsation will help improving converting means.
Two-tube Buck-Boost converter, it has the buck function, can realize the high efficiency of converter in the input voltage range of broad, is applied than the wide input voltage range occasion at combining inverter, fuel cell and communication power supply etc.
Two-tube Buck-Boost converter is also to be simplified by Buck converter and the cascade of Boost converter to form, its structure comprises input source 1A, Buck unit 2A, energy storage inductor 3A, Boost unit 4A, filter capacitor 5A and load 6A, as shown in Figure 1, Buck unit wherein is meant the construction unit after the Buck converter is removed input source, filter circuit and load, it is made up of switching tube and diode, same Boost unit is meant the construction unit after the Boost converter is removed input source, energy storage inductor, filter capacitor and load, and it is made up of switching tube and diode.
For the inductive current pulsation that reduces two-tube Buck-Boost converter with further raising inverter power density and efficient, there have the scholar to propose to be two along modulator approach (X.Ren, X.Ruan, H.Qian, M.Li, Q.Chen. " Three-mode dual-frequency two-edge modulation scheme forfour-switch buck-boost converter; " IEEE Transactions on Power Electronics, vol.24, no.2, pp.499-509,2009), promptly the Buck unit adopts leading edge modulation, the Boost unit adopts the back along modulation, or the edge modulation of employing back, Buck unit, the Boost unit adopts leading edge modulation, can guarantee whole input voltage range internal inductance current pulsation minimum.
Summary of the invention
The objective of the invention is to the problem that exists in the full bridge-Boost converter along modulator approach at two, propose to be applicable to the full bridge-Boost converter, and the inductive current pulsation minimum modulation method that is simple and easy to realize, power density of transform and efficient improved.
A kind of modulator approach that makes the full bridge-Boost DC converter inductive current pulsation minimum, wherein said full bridge-Boost converter is to replace the Buck unit of two-tube Buck-Boost converter and the class isolation type Buck-Boost converter that constitutes with the full-bridge Disconnecting switch unit, this full bridge-Boost transformer configuration comprises that input source, full-bridge Disconnecting switch unit, energy storage inductor, Boost unit, filter capacitor and load form, and wherein the full-bridge Disconnecting switch unit is meant that full-bridge converter removes the construction unit after input source, filter circuit and the load.Because adopt phase shifting control, the full-bridge Disconnecting switch unit specifically comprises the full bridge unit of being made up of switching tube, the resonant inductance L that contains transformer leakage inductance
r, isolating transformer T
r, rectifier bridge unit four parts formed of diode.
The full bridge-Boost converter comprises two unit that can distinguish independent control, i.e. full bridge unit and Boost unit.Efficient for realizing, full bridge unit generally adopts phase shifting control to realize soft switch.For phase shifting control, full bridge unit comprises leading-bridge and lagging leg, the drive control signal of leading-bridge switching tube is through the available pulse signal that is made of its Dead Time after the NOR gate, the pulse duration of this pulse signal and amplitude all satisfy the requirement of synchronizing signal, utilize the synchronizing signal of this pulse signal as the Boost unit, promptly open Boost unit switch pipe, thereby guarantee the converter inductive current pulsation minimum in the moment that the leading-bridge switching tube turn-offs.
The concrete technical scheme that adopts is:
A kind of modulator approach that makes the full bridge-Boost DC converter inductive current pulsation minimum, wherein this full bridge-Boost DC converter is to be replaced the Buck unit in the two-tube Buck-Boost DC converter and formed by the full-bridge Disconnecting switch unit, and this full bridge-Boost converter comprises input source 1, full-bridge Disconnecting switch unit 2, energy storage inductor 3, Boost unit 4, filter capacitor 5 and load 6;
Wherein, described full-bridge Disconnecting switch unit is meant that full-bridge converter removes the construction unit after input source, filter circuit and the load, specifically comprises four switching tube Q
1～Q
4The full bridge unit, the resonant inductance L that form
r, isolating transformer T
rWith four diode D
1～D
4Rectifier bridge unit four parts of forming.For the full bridge unit that adopts phase shifting control, it comprises leading-bridge and lagging leg, it is characterized in that,
When turn-offing described leading-bridge switching tube, open the switching tube of Boost unit, can realize the full bridge-Boost DC converter inductive current pulsation minimum.
As a further improvement on the present invention, obtain the drive control signal of described leading-bridge switching tube, and carry out NOR-operation, the pulse signal that obtains can be realized the described switching tube of opening Boost unit 4 when turn-offing the leading-bridge switching tube as the synchronization pulse of described Boost unit 4 switching tubes.
As a further improvement on the present invention, the pulse duration of described pulse signal equates with the Dead Time of described leading-bridge switching tube.
Modulation strategy of the present invention can guarantee the whole input voltage range internal inductance of full bridge-Boost converter current pulsation minimum, and implementation is very simple.
Description of drawings
Fig. 1. two-tube Buck-Boost transformer configuration schematic diagram.
Fig. 2. full bridge-Boost transformer configuration schematic diagram of the present invention.
Fig. 3. modulator approach hardware circuit of the present invention is specifically implemented schematic diagram.
Fig. 4. the waveform schematic diagram under a kind of working condition of full bridge-Boost converter of application modulator approach of the present invention.
Fig. 5. the waveform schematic diagram under the another kind of working condition of the full bridge-Boost converter of application modulator approach of the present invention.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
A kind of modulator approach that makes the full bridge-Boost DC converter inductive current pulsation minimum, wherein said full bridge-Boost converter is a class isolation type Buck-Boost converter that constitutes with the Buck unit of two-tube Buck-Boost converter among full-bridge Disconnecting switch unit replacement Fig. 1, the application scenario that it mainly is applicable to the input voltage range broad and requires electrical isolation.
This full bridge-Boost transformer configuration comprises that input source 1, full-bridge Disconnecting switch unit 2, energy storage inductor 3, Boost unit 4, filter capacitor 5 and load 6 form, and wherein full-bridge Disconnecting switch unit 2 is meant that full-bridge converter removes the construction unit after input source, filter circuit and the load.Because adopt phase shifting control, the full-bridge Disconnecting switch unit specifically comprises by switching tube Q
1～Q
4The full bridge unit of forming, contain the resonant inductance L of transformer leakage inductance
r, isolating transformer T
r, diode D
1～D
4Rectifier bridge unit four parts of forming, as shown in Figure 2.For the full bridge unit that adopts phase shifting control, it comprises leading-bridge and lagging leg, wherein Q
1And Q
3Be defined as leading-bridge, Q
2And Q
4Be defined as lagging leg.
Below the transmission relation of the described full bridge-Boost DC converter of Fig. 2 is analyzed.
As shown in Figure 2, its inductance L
fBoth end voltage is respectively v
1And v
2, v wherein
1Also be output voltage after the full bridge unit rectification, its mean value is v
1=(d
1-D
Loss) kV
In, d wherein
1Be full bridge unit duty ratio, D
LossBe the full bridge unit duty-cycle loss that resonant inductance causes, k is the turn ratio of transformer secondary to former limit, V
InBe the converter input voltage.Same v
2Also be Boost unit switch pipe drain-source voltage, its mean value is v
1=(1-d
2) V
o, d wherein
2Be Boost unit duty ratio, V
oBe the converter output voltage.Because inductance L
fThe weber area all be zero in each Boost unit switch cycle, promptly
Thereby full bridge-Boost converter input voltage V as can be known
InAnd output voltage V
oBetween the pass be
Different with two-tube Buck-Boost converter is, the transformer leakage inductance of full bridge-Boost converter and resonant inductance will cause the duty-cycle loss of full bridge unit, edge modulation after full bridge unit adopts, the Boost unit adopts leading edge modulation, the effective duty ratio of full bridge unit, i.e. the duty ratio d of output voltage after the full bridge unit rectification
1-D
LossAnd Boost unit duty ratio d
2Relative position owing to duty-cycle loss changes, do not satisfy two requirements along modulator approach, can not guarantee the inductive current pulsation minimum.And when full bridge unit employing leading edge modulation, the Boost unit adopts the back along modulation, and effective duty ratio of full bridge unit and Boost unit duty ratio relative position do not change with duty-cycle loss, satisfied two requirements along modulator approach, inductive current pulsation minimum.For guaranteeing the high efficiency of converter, full bridge unit generally adopts phase shifting control open-minded with the no-voltage that realizes its switching tube, for present phase shifting control chip, as UC3875, UC3879 or UC3895, be the back along modulation,, need to increase complicated peripheral circuit if realize its leading edge modulation.The present invention utilizes the synchronizing signal of the Dead Time of full bridge unit leading-bridge as Boost unit switch pipe, promptly open the switching tube of Boost unit in the moment of turn-offing described leading-bridge switching tube, do not needing to increase under the prerequisite of complex peripheral circuit, just can realize the leading edge modulation of full bridge unit in the full bridge-Boost DC converter and the back edge modulation of Boost unit, the inductive current pulsation minimum.
Provide the concrete enforcement schematic diagram of modulator approach hardware circuit of the present invention below.
Fig. 3 is the specific embodiment of the described full bridge-Boost converter applications of Fig. 2 modulator approach of the present invention, wherein UC3895 is the full bridge unit control chip, be used for realizing the phase shifting control of full bridge unit, UC3525 is a Boost unit controls chip, be used for realizing the Boost unit PWM control.For UC3895, its 14 pin and 13 pin are leading-bridge drive control signal, deliver to Q respectively
1And Q
318 pin and 17 pin are lagging leg drive control signal, deliver to Q respectively
2And Q
4Leading-bridge control signal wherein, promptly the signal of 14 pin and 13 pin can obtain a pulse signal through after the NOR gate, and its pulse duration is the Dead Time of leading-bridge.This pulse promptly can be used as the synchronizing signal of Boost unit, delivers to the SYNC pin of UC3525, i.e. 3 pin, thus guarantee Boost unit switch pipe Q
bAt full bridge unit leading-bridge switching tube Q
1And Q
3Shutoff constantly open-minded, realize the back of the leading edge modulation of full bridge unit and Boost unit, inductive current pulsation minimum, and its implementation is very simple along modulation.Need to prove, equate, be convenient to the optimal design of inductance, so the drive control signal of Boost unit switch pipe is by 11 pin of UC3525 and the signal after 14 pin process or the door for guaranteeing full-bridge Boost converter inductance both end voltage frequency.
Provide the groundwork waveform schematic diagram of the full bridge-Boost converter of using modulator approach of the present invention below.
According to input voltage V
In, the isolating transformer secondary is to the turn ratio k and the output voltage V of former change
oBetween relation, the full bridge-Boost converter comprises kV
In〉=V
oAnd kV
In＜V
oTwo kinds of working conditions are used groundwork waveform schematic diagram under two kinds of working conditions of modulator approach of the present invention respectively shown in Figure 4 and 5.Fig. 4 or Fig. 5, from top to bottom, waveform is respectively full bridge unit leading-bridge switching tube Q
1And Q
3Drive control signal, full bridge unit lagging leg switching tube Q
2And Q
4Drive control signal, leading-bridge switching tube Q
1And Q
3The drive control signal nondisjunction after signal Clock, Boost unit carrier signal V
RAMP, the voltage v after the rectification of full bridge unit secondary
1, Boost unit switch pipe Q
bDrive control signal and inductive current i
LfFrom Fig. 4 and Fig. 5 equally as can be seen, leading-bridge switching tube Q
1And Q
3Signal Clock after the drive control signal nondisjunction is as the carrier wave V of Boost unit
RAMPSynchronizing signal, promptly guarantee Boost unit switch pipe Q
bAt full bridge unit leading-bridge switching tube Q
1Or Q
3The moment of turn-offing is open-minded, and this moment, full bridge unit and Boost unit self all adopted the back along modulation, but from full bridge unit secondary commutating voltage v
1With Boost unit switch pipe Q
bDrive control signal as can be seen, modulation strategy of the present invention has been realized the back along modulation, inductive current pulsation minimum of the leading edge modulation of full bridge unit and Boost unit.
Below to Fig. 4 and kV shown in Figure 5
In〉=V
oAnd kV
In＜V
oUnder two kinds of situations, the size of the inductive current pulsation of full bridge-Boost DC converter is analyzed respectively.
Input/output relation expression formula according to the full bridge-Boost converter
As can be known, work as kV
In〉=V
oThe time, d
1-D
Loss+ d
2＜1, i.e. the switching tube Q of full bridge unit
1And Q
4(or Q
2And Q
3) and Boost unit switch pipe Q
bCertain time T of turn-offing simultaneously that exists
Olp_off=(1-d
1-d
2+ D
Loss) T
s/ 2, T wherein
sBe the full bridge unit switch periods, because the switch periods of Boost unit switch pipe should be equal with the switch periods of output voltage after the full bridge unit rectification, so the Boost unit switch cycle is T
s/ 2.From each Boost unit switch cycle, inductive current is only at T
Olp_offDescend, as shown in Figure 4, inducing current embodied formula and was this moment
F wherein
sBe full bridge unit switching frequency, L
fEnergy storage inductor for the full bridge-Boost converter.
According to the input/output relation expression formula of full bridge-Boost converter, work as kV equally
In＜V
oThe time, d
1-D
Loss+ d
2＞1, full bridge unit switching tube Q
1And Q
4(or Q
2And Q
3) and Boost unit switch pipe Q
bCertain time T that has conducting simultaneously
Olp_on=(d
1+ D
Loss+ d
2-1) T
s/ 2, from each Boost unit switch cycle, inductive current is only at T
Olp_onRise, as shown in Figure 5, inducing current embodied formula and was this moment
Claims (3)
1. modulator approach that makes the full bridge-Boost DC converter inductive current pulsation minimum, wherein this full bridge-Boost DC converter is to be replaced the Buck unit (2A) in the two-tube Buck-Boost DC converter and formed by full-bridge Disconnecting switch unit (2), and this full bridge-Boost converter comprises input source (1), full-bridge Disconnecting switch unit (2), energy storage inductor L
f(3), Boost unit (4) and filter capacitor C
f(5) and load (6); Wherein, described full-bridge Disconnecting switch unit (2) is meant that full-bridge converter removes the construction unit after input source, filter circuit and the load, and it specifically comprises: four switching tube Q
1～Q
4The full bridge unit, the resonant inductance L that form
r, isolating transformer T
rWith four diode D
1～D
4Rectifier bridge unit four parts of forming.Described full bridge unit adopts phase shifting control, and it comprises leading-bridge and lagging leg, it is characterized in that,
When turn-offing described leading-bridge switching tube, open the switching tube of Boost unit (4), can realize the full bridge-Boost DC converter inductive current pulsation minimum.
2. modulator approach according to claim 1, it is characterized in that, obtain the drive control signal of described leading-bridge switching tube, and carry out NOR-operation, the pulse signal that obtains can be realized the described switching tube of opening Boost unit (4) when turn-offing the leading-bridge switching tube as the synchronization pulse of described Boost unit (4) switching tube.
3. modulator approach according to claim 1 and 2 is characterized in that, the pulse duration of described pulse signal equates with the Dead Time of described leading-bridge switching tube.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064706A (en) * | 2011-01-19 | 2011-05-18 | 南京航空航天大学 | Single-primary winding voltage source type multi-input full-bridge converter |
| CN102299632A (en) * | 2011-08-30 | 2011-12-28 | 南京邮电大学 | Buck-boost direct-current converter |
| CN103199707A (en) * | 2013-03-19 | 2013-07-10 | 北京交通大学 | Method for controlling drive pulses of DAB type bidirectional isolation DC-DC converter |
| CN105584472A (en) * | 2014-11-07 | 2016-05-18 | 罗伯特·博世有限公司 | Brake system of vehicle, method of running brake system of vehicle, and production method of producing brake system of vehicle |
| CN109787473A (en) * | 2019-02-19 | 2019-05-21 | 西南交通大学 | A kind of double edge modulation output voltage control methods of boost converter and device |
| CN111030463A (en) * | 2019-12-17 | 2020-04-17 | 华南理工大学 | Frequency stable switching digital method based on inductance-free isolation Buck-Boost circuit |
| CN111884518A (en) * | 2020-07-31 | 2020-11-03 | 广东电网有限责任公司电力科学研究院 | DAB control method, device, equipment and storage medium based on capacitance current ripple |
| US10892683B2 (en) | 2018-10-25 | 2021-01-12 | Samsung Electronics Co., Ltd. | Electronic circuit for estimating intensity of load current based on internal condition of boost converter |
| CN114157125A (en) * | 2021-12-06 | 2022-03-08 | 深圳市迪浦电子有限公司 | Power converter and system |
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| CN102064706A (en) * | 2011-01-19 | 2011-05-18 | 南京航空航天大学 | Single-primary winding voltage source type multi-input full-bridge converter |
| CN102299632A (en) * | 2011-08-30 | 2011-12-28 | 南京邮电大学 | Buck-boost direct-current converter |
| CN103199707A (en) * | 2013-03-19 | 2013-07-10 | 北京交通大学 | Method for controlling drive pulses of DAB type bidirectional isolation DC-DC converter |
| CN105584472A (en) * | 2014-11-07 | 2016-05-18 | 罗伯特·博世有限公司 | Brake system of vehicle, method of running brake system of vehicle, and production method of producing brake system of vehicle |
| CN105584472B (en) * | 2014-11-07 | 2019-12-10 | 罗伯特·博世有限公司 | Vehicle brake system, method for operating a vehicle brake system and method for producing a vehicle brake system |
| US10892683B2 (en) | 2018-10-25 | 2021-01-12 | Samsung Electronics Co., Ltd. | Electronic circuit for estimating intensity of load current based on internal condition of boost converter |
| CN109787473A (en) * | 2019-02-19 | 2019-05-21 | 西南交通大学 | A kind of double edge modulation output voltage control methods of boost converter and device |
| CN109787473B (en) * | 2019-02-19 | 2024-03-29 | 西南交通大学 | Control method and device for dual-edge modulation output voltage of boost converter |
| CN111030463A (en) * | 2019-12-17 | 2020-04-17 | 华南理工大学 | Frequency stable switching digital method based on inductance-free isolation Buck-Boost circuit |
| CN111030463B (en) * | 2019-12-17 | 2021-05-14 | 华南理工大学 | Frequency stable switching digital method based on inductance-free isolation Buck-Boost circuit |
| CN111884518B (en) * | 2020-07-31 | 2021-08-13 | 广东电网有限责任公司电力科学研究院 | DAB control method, device, equipment and storage medium based on capacitance current ripple |
| CN111884518A (en) * | 2020-07-31 | 2020-11-03 | 广东电网有限责任公司电力科学研究院 | DAB control method, device, equipment and storage medium based on capacitance current ripple |
| CN114157125A (en) * | 2021-12-06 | 2022-03-08 | 深圳市迪浦电子有限公司 | Power converter and system |
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