CN103023315A - Boost circuit - Google Patents
Boost circuit Download PDFInfo
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- CN103023315A CN103023315A CN2011102979944A CN201110297994A CN103023315A CN 103023315 A CN103023315 A CN 103023315A CN 2011102979944 A CN2011102979944 A CN 2011102979944A CN 201110297994 A CN201110297994 A CN 201110297994A CN 103023315 A CN103023315 A CN 103023315A
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Abstract
The invention discloses a Boost circuit which comprises a direct current source, a first inductor, a first switching tube, a filtering capacitor, loads, a second inductor, a second switching tube and a third switching tube, wherein the third switching tube is disconnected when the first inductor and the second inductor are charged, and is connected when the filtering capacitor is charged, the positive output end of the direct current source is connected with the negative output end of the direct current source by the first inductor and the first switching tube, the positive output end of the direct current source is connected with the negative output end of the direct current source by the second switching tube and the second inductor, after the third switching tube is connected in series with the filtering capacitor, one end of the third switching tube is connected with the connection point of the first inductor and the first switching tube, and the other end of the third switching tube is connected with the connection point of the second inductor and the second switching tube, and the loads are connected in parallel at the two ends of the filtering capacitor. According to the technical scheme, the Boost circuit is high in gain, high in efficiency, low in cost and simple to control.
Description
Technical field
The present invention relates to DC voltage conversion circuit, relate in particular to a kind of Boost booster circuit.
Background technology
The Boost booster circuit is a kind of DC voltage booster circuit, that is, its output voltage is higher than input voltage.
Fig. 1 is a kind of traditional single-stage Boost booster circuit, and this single-stage Boost booster circuit mainly is comprised of input direct-current source Udc, inductance L 1, switching tube Q1, diode D1, filter capacitor Cout and load Z etc.By conducting and the cut-off of control switch pipe Q1, impel inductance L 1 corresponding energy storage and afterflow.Under the stable state, inductance L 1 can reach counts balance weber, satisfies relational expression between output voltage and the input voltage:
(M is circuit gain; D is the duty ratio of switching tube Q1).Ideally, regulate the size of duty ratio D, can realize the output of any voltage value, but in side circuit, be subjected to line impedance, the impact of the aspect such as device property and power consumption, the gain of traditional B oost booster circuit can only reach about 4 times, can not satisfy the needs of high gain boost.
Fig. 2 is a kind of two-stage Boost booster circuit, and this Boost booster circuit is made of two traditional single-stage Boost circuit series connection, can further improve like this gain of boosting of Boost booster circuit, satisfies relational expression between output voltage and the input voltage:
(M is circuit gain; D1 is the duty ratio of switching tube Q1; D2 is the duty ratio of switching tube Q2).The maximum gain of two-stage Boost circuit series topology is about 16 times, and the gain of circuit is very high.But such two-stage Boost booster circuit has following some deficiency:
(1) boost owing to having carried out two-stage, circuit efficiency also can obviously descend, and (efficient of supposing one-level Boost booster circuit is
, the efficient of two-stage Boost booster circuit is exactly basically so
If
=0.95, then
=0.90);
(2) cost compare is high, two-stage Boost booster circuit is owing to switching tube quantity, inductance (two inductance belong to same levels) quantity are the twices of single-stage Boost booster circuit, and also need the very large capacitor C of use capacity 1 between first order Boost booster circuit and the second level Boost booster circuit, to keep the stable output of first order Boost booster circuit;
(3) control is complicated, and the control target of two-stage Boost booster circuit has two: the output of the first order and the output of the second level, two-stage control intercouples the control strategy slightly complicated.
Summary of the invention
The technical problem to be solved in the present invention is, and is low for the above-mentioned gain of prior art, cost is high, control complicated defective, and a kind of high-gain, low cost, the simple Boost booster circuit of control are provided.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of Boost booster circuit, comprise DC source, the first inductance, the first switching tube, filter capacitor and load, described Boost booster circuit also comprises the second inductance, second switch pipe and being used at the first inductance, end during the second induction charging, and the 3rd switching tube of conducting when filter capacitor charges, wherein, the positive output end of DC source is by the first inductance, the first switching tube connects the negative output terminal of DC source, the positive output end of DC source is also by the second switch pipe, the second inductance connects the negative output terminal of DC source, the 3rd switching tube is with after filter capacitor is connected, one end connects the tie point of the first inductance and the first switching tube, the other end connects the tie point of the second inductance and second switch pipe, and load is connected in parallel on the two ends of filter capacitor.
In Boost booster circuit of the present invention, described the first inductance and the second inductance are the coupling inductance that intercouples.
In Boost booster circuit of the present invention, one end of described the 3rd switching tube connects the tie point of the first inductance, the first switching tube, the other end of the 3rd switching tube connects the positive pole of filter capacitor, and the negative pole of filter capacitor connects the tie point of the second inductance and second switch pipe.
In Boost booster circuit of the present invention, the positive pole of described filter capacitor connects the tie point of the first inductance, the first switching tube, the negative pole of filter capacitor connects an end of described the 3rd switching tube, and the other end of the 3rd switching tube connects the tie point of the second inductance and second switch pipe.
In Boost booster circuit of the present invention, described the 3rd switching tube is diode.
In Boost booster circuit of the present invention, described the 3rd switching tube is metal-oxide-semiconductor or IGBT pipe.
In Boost booster circuit of the present invention, described the first switching tube, second switch pipe are respectively metal-oxide-semiconductor or IGBT pipe.
Implement technical scheme of the present invention, have following beneficial effect:
1, high-gain
With the gain of traditional single-stage Boost booster circuit (
) compare, the gain of the Boost booster circuit among the application (
) be doubled, bring up to 8~9 times of gains (duty ratio D is in 0.8 the situation) by 4~5 times of original gains;
2, high efficiency
Two-stage Boost booster circuit series topology is the two-stage conversion, the power of every one-level conversion all is total power, and this paper puies forward topology and changes for one-level, and two inductance, switching tubes bear respectively general power, can be higher than two-stage Boost booster circuit series topology aspect efficient;
3, cost is low
Compare with two-stage Boost booster circuit series topology, the Boost booster circuit among the application reduces an electric capacity, a diode; And the power grade of employed two inductance of Boost booster circuit among the application is half of used electric inductance power grade in the two-stage Boost booster circuit series topology, and inductance wire diameter and used magnet ring all can be less; Two-stage Boost booster circuit series topology needs two cover voltages, current sampling circuit, two cover switching tube current-limiting protection circuits, and the Boost booster circuit among the application only needs a cover voltage, current sampling circuit, a cover switching tube current-limiting protection circuit.Therefore, the cost of the Boost booster circuit among the application is starkly lower than two-stage Boost booster circuit series topology.
4, control is simple
Two-stage Boost booster circuit series topology need to be controlled simultaneously to first order output voltage, second level output voltage, and there is stronger coupling in two-stage control, causes control algolithm complicated, debug difficulties; Boost booster circuit among the application is just the same to the control of two inductance, switching tube, full symmetric, and therefore control is very simple, and is similar with the control method of traditional single stage Boost booster circuit, and algorithm is ripe.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is a kind of circuit diagram of traditional single-stage Boost booster circuit;
Fig. 2 is a kind of circuit diagram of two-stage Boost booster circuit;
Fig. 3 is the circuit diagram of Boost booster circuit embodiment one of the present invention;
Fig. 4 A is the isoboles of the first state of the Boost booster circuit among Fig. 3;
Fig. 4 B is the isoboles of the second state of the Boost booster circuit among Fig. 3;
Fig. 4 C is the isoboles of the third state of the Boost booster circuit among Fig. 3;
Fig. 5 is the circuit diagram of Boost booster circuit embodiment two of the present invention;
Fig. 6 is the circuit diagram of Boost booster circuit embodiment three of the present invention;
Fig. 7 is the circuit diagram of Boost booster circuit embodiment four of the present invention;
Fig. 8 is the circuit diagram of Boost booster circuit embodiment five of the present invention;
Fig. 9 is the circuit diagram of Boost booster circuit embodiment six of the present invention;
Figure 10 is the circuit diagram of Boost booster circuit embodiment seven of the present invention;
Figure 11 is the circuit diagram of Boost booster circuit embodiment eight of the present invention.
Embodiment
As shown in Figure 3, in the circuit diagram of Boost booster circuit embodiment one of the present invention, this Boost booster circuit comprises DC source Udc, inductance L 1, switching tube Q1, filter capacitor Cout, load Z, inductance L 2, switching tube Q2 and diode D1.Wherein, the positive output end of DC source Udc connects the negative output terminal of DC source Udc by inductance L 1, switching tube Q1, the positive output end of DC source Udc also connects the negative output terminal of DC source Udc by switching tube Q2, inductance L 2, the end of diode D1 connects the tie point of inductance L 1 and switching tube Q1, the other end of diode D1 connects the positive pole of filter capacitor Cout, the negative pole of filter capacitor Cout connects the tie point of inductance L 2 and switching tube Q2, and load Z is connected in parallel on the two ends of filter capacitor Cout.In this embodiment, the preferred metal-oxide-semiconductor of switching tube Q1, Q2 also can be selected the IGBT pipe.
The following describes the operation principle of the Boost booster circuit of this embodiment.This Boost booster circuit has continuous current mode pattern CCM(Continuous current mode) and discontinous mode DCM(Discontinuous current mode).The below specifies respectively this two kinds of working methods:
One, continuous current mode pattern
There is the two states shown in Fig. 4 A and Fig. 4 B in the continuous current mode pattern:
(1). on off state 1: switching tube Q1, Q2 conducting (
)
During t=0, switching tube Q1, Q2 are open-minded, and the direct voltage Vdc of DC source Udc is added in respectively the two ends of inductance L 1, L2, inductance L 1, L2 current flowing storage power, and diode D1 is reversed cut-off, and at this moment, equivalent electric circuit is shown in Fig. 4 A;
Constantly, switching tube Q1, Q2 cut-off, the conducting of diode D1 forward bias, DC source Udc power and the energy that is stored among inductance L 1, the L2 flow to load Z and filter capacitor Cout by diode D1.At this moment, equivalent electric circuit is shown in Fig. 4 B, and the voltage that is added on each inductance is
Under the stable state, inductance L 1, L2 will reach and weber count balance, obtain accordingly circuit gain and be:
(M is circuit gain; D is the duty ratio of switching tube Q1, Q2).
Two, discontinous mode
There are three kinds of states shown in Fig. 4 A, 4B and the 4C in discontinous mode:
(1). on off state 1
Switching tube Q1, Q2 are open-minded, and the direct voltage Vdc of DC source Udc is added in respectively the two ends of inductance L 1, L2, inductance L 1, L2 current flowing storage power, diode D1 is reversed cut-off, and the electric current of inductance L 1, L2 increases from zero to maximum, and at this moment, equivalent electric circuit is shown in Fig. 4 A;
(2). on off state 2
Switching tube Q1, Q2 cut-off, the conducting of diode D1 forward bias, the electric current of inductance L 1, L2 drops to zero from maximum, and equivalent electric circuit is shown in Fig. 4 B;
(3). on off state 3
Switching tube Q1, Q2 are zero by, the electric current of inductance L 1, L2 all, and load Z is by filter capacitor Cout power supply, and its equivalent electric circuit is shown in Fig. 4 C.
By above analysis, the Boost booster circuit of the present embodiment has the following advantages:
1, high-gain
With the gain of traditional single-stage Boost booster circuit (
) compare, the gain of the Boost booster circuit among the application (
) be doubled, bring up to 8~9 times of gains (duty ratio D is in 0.8 the situation) by 4~5 times of original gains;
2, high efficiency
Two-stage Boost booster circuit series topology is the two-stage conversion, the power of every one-level conversion all is total power, and this paper puies forward topology and changes for one-level, and two inductance, switching tubes bear respectively general power, can be higher than two-stage Boost booster circuit series topology aspect efficient;
3, cost is low
Compare with two-stage Boost booster circuit series topology, the Boost booster circuit among the application reduces an electric capacity, a diode; And the power grade of employed two inductance of Boost booster circuit among the application is half of used electric inductance power grade in the two-stage Boost booster circuit series topology, and inductance wire diameter and used magnet ring all can be less; Two-stage Boost booster circuit series topology needs two cover voltages, current sampling circuit, two cover switching tube current-limiting protection circuits, and the Boost booster circuit among the application only needs a cover voltage, current sampling circuit, a cover switching tube current-limiting protection circuit.Therefore, the cost of the Boost booster circuit among the application is starkly lower than two-stage Boost booster circuit series topology.
4, control is simple
Two-stage Boost booster circuit series topology need to be controlled simultaneously to first order output voltage, second level output voltage, and there is stronger coupling in two-stage control, causes control algolithm complicated, debug difficulties; Boost booster circuit among the application is just the same to the control of two inductance, switching tube, full symmetric, and therefore control is very simple, and is similar with the control method of traditional single stage Boost booster circuit, and algorithm is ripe.
To sum up, when topology that this paper carries need to be applied to DC-DC to boost doubly occasion of 4-9, have very large advantage, and this also is the multiple section of boosting that often can use.
Fig. 5 is the circuit diagram of Boost booster circuit embodiment two of the present invention, the circuit diagram of this embodiment is compared with the circuit diagram of embodiment shown in Figure 3, difference only is: inductance L 1 and the coupling inductance of inductance L 2 for intercoupling, the operation principle of the Boost booster circuit of this embodiment is consistent with the operation principle of Fig. 3, does not repeat them here.In addition, because the both end voltage of inductance L 1, inductance L 2 is by mutual clamper, so that the characteristic that inductance L 1, inductance L 2 show is more consistent, the stress index of switching tube Q1, switching tube Q2 also can be more consistent, is beneficial to stable, the reliably working of converter.
Fig. 3 and Fig. 5 only are one embodiment of the present of invention, and the present invention does not limit the link position of diode D1.In another embodiment, as shown in Figure 6, the positive pole of filter capacitor Cout connects the tie point of inductance L 1, switching tube Q1, and the negative pole of filter capacitor Cout connects the end of described diode D1, and the other end of diode D1 connects the tie point of inductance L 2 and switching tube Q2.The operation principle that should be noted that the annexation of other components and parts among this embodiment and this Boost booster circuit can be with reference to embodiment shown in Figure 3.
In another embodiment, on the basis of Boost booster circuit shown in Figure 6, preferably, and as shown in Figure 7, inductance L 1, the coupling inductance of inductance L 2 for intercoupling.
In the above-described embodiments, be used for cut-off when inductance L 1, inductance L 2 charging, and the 3rd switching tube of conducting all describes as an example of diode D1 example when filter capacitor Cout charges, be to be understood that, this is one embodiment of the present of invention, in another embodiment, as shown in Figure 8, the 3rd switching tube also can be selected metal-oxide-semiconductor (perhaps IGBT pipe).In this embodiment, the first end of metal-oxide-semiconductor Q3 connects the tie point of inductance L 1 and switching tube Q1, and the second end of metal-oxide-semiconductor Q3 connects the positive pole of filter capacitor Cout, the negative pole connecting valve pipe Q2 of filter capacitor Cout and the tie point of inductance L 2.In this embodiment, if the switching sequence of metal-oxide-semiconductor Q3 and switching tube Q1, Q2 cooperatively interacts, can also further improve the efficient of this Boost booster circuit; In addition, metal-oxide-semiconductor Q3 can be used as chopping switching tube, and switching tube Q1, Q2 realize energy by the reverse flow of filter capacitor Cout to DC source Udc as rectifying device, and at this moment, this Boost booster circuit develops into powerful BUCK circuit.Therefore, this circuit has developed into the Boost circuit that both can be shifted by DC source Udc energy to filter capacitor Cout, can by filter capacitor Cout to the Buck circuit that DC source Udc shifts energy, can be referred to as the two-way circuit topology again.Certainly, similarly, in another embodiment, as shown in Figure 9, the position of metal-oxide-semiconductor Q3 also is adjustable to the opposite side of filter capacitor Cout, be specially: the positive pole of filter capacitor Cout connects the tie point of inductance L 1, switching tube Q1, and the negative pole of filter capacitor Cout connects the end of metal-oxide-semiconductor Q1, and the other end of metal-oxide-semiconductor Q3 connects the tie point of inductance L 2 and switching tube Q2.
In another embodiment, on the basis of embodiment shown in Figure 8, preferably, as shown in figure 10, inductance L 1, inductance L 2 are coupling inductance.Similarly, on the basis of embodiment shown in Figure 9, preferably, as shown in figure 11, inductance L 1, inductance L 2 be the preferred coupled inductance also.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (7)
1. Boost booster circuit, comprise DC source (Udc), the first inductance (L1), the first switching tube (Q1), filter capacitor (Cout) and load (Z), it is characterized in that, described Boost booster circuit also comprises the second inductance (L2), second switch pipe (Q2) and being used at the first inductance (L1), cut-off during the second inductance (L2) charging, and the 3rd switching tube of conducting when filter capacitor (Cout) charges, wherein, the positive output end of DC source (Udc) is by the first inductance (L1), the first switching tube (Q1) connects the negative output terminal of DC source (Udc), the positive output end of DC source (Udc) is also by second switch pipe (Q2), the second inductance (L2) connects the negative output terminal of DC source (Udc), the 3rd switching tube is with after filter capacitor (Cout) is connected, one end connects the tie point of the first inductance (L1) and the first switching tube (Q1), the other end connects the tie point of the second inductance (L2) and second switch pipe (Q2), and load (Z) is connected in parallel on the two ends of filter capacitor (Cout).
2. Boost booster circuit according to claim 1 is characterized in that, described the first inductance (L1) and the second inductance (L2) coupling inductance for intercoupling.
3. Boost booster circuit according to claim 1, it is characterized in that, one end of described the 3rd switching tube connects the tie point of the first inductance (L1), the first switching tube (Q1), the other end of the 3rd switching tube connects the positive pole of filter capacitor (Cout), and the negative pole of filter capacitor (Cout) connects the tie point of the second inductance (L2) and second switch pipe (Q2).
4. Boost booster circuit according to claim 1, it is characterized in that, the positive pole of described filter capacitor (Cout) connects the tie point of the first inductance (L1), the first switching tube (Q1), the negative pole of filter capacitor (Cout) connects an end of described the 3rd switching tube, and the other end of the 3rd switching tube connects the tie point of the second inductance (L2) and second switch pipe (Q2).
5. each described Boost booster circuit is characterized in that according to claim 1-4, and described the 3rd switching tube is diode.
6. each described Boost booster circuit is characterized in that according to claim 1-4, and described the 3rd switching tube is metal-oxide-semiconductor or IGBT pipe.
7. Boost booster circuit according to claim 1 is characterized in that, described the first switching tube (Q1), second switch pipe (Q2) are respectively metal-oxide-semiconductor or IGBT pipe.
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CN2011102979944A CN103023315A (en) | 2011-09-28 | 2011-09-28 | Boost circuit |
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CN2011102979944A CN103023315A (en) | 2011-09-28 | 2011-09-28 | Boost circuit |
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Cited By (6)
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CN105958833A (en) * | 2016-06-28 | 2016-09-21 | 上海空间电源研究所 | Y-shaped switching power supply |
CN106026657A (en) * | 2016-07-08 | 2016-10-12 | 西华大学 | Non-isolated high-gain DC-DC boost converter |
CN106100324A (en) * | 2016-06-28 | 2016-11-09 | 西华大学 | High-gain DC booster converter based on the positive clamper of diode |
TWI575860B (en) * | 2015-11-18 | 2017-03-21 | 國立臺灣科技大學 | Boost converter |
CN108712076A (en) * | 2018-06-21 | 2018-10-26 | 哈尔滨理工大学 | A kind of fuel cell car DC/DC transformer configurations and its control method |
CN111900877A (en) * | 2020-06-29 | 2020-11-06 | 哈尔滨工程大学 | Soft-switching high-gain direct-current converter based on coupling inductor and boost capacitor |
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CN108712076A (en) * | 2018-06-21 | 2018-10-26 | 哈尔滨理工大学 | A kind of fuel cell car DC/DC transformer configurations and its control method |
CN111900877A (en) * | 2020-06-29 | 2020-11-06 | 哈尔滨工程大学 | Soft-switching high-gain direct-current converter based on coupling inductor and boost capacitor |
CN111900877B (en) * | 2020-06-29 | 2022-04-05 | 哈尔滨工程大学 | Soft-switching high-gain direct-current converter based on coupling inductor and boost capacitor |
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Application publication date: 20130403 |