CN203368351U - BOOST-BUCK-BOOST bridgeless convertor - Google Patents
BOOST-BUCK-BOOST bridgeless convertor Download PDFInfo
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- CN203368351U CN203368351U CN 201320353983 CN201320353983U CN203368351U CN 203368351 U CN203368351 U CN 203368351U CN 201320353983 CN201320353983 CN 201320353983 CN 201320353983 U CN201320353983 U CN 201320353983U CN 203368351 U CN203368351 U CN 203368351U
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- diode
- boost
- inductance
- buck
- load
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Abstract
The utility model discloses a BOOST-BUCK-BOOST bridgeless convertor which comprises an input alternating current power supply, a first switch tube, a second switch tube, an inductor, a first diode, a second diode, a third diode, a capacitor and a load. A source electrode of the first switch tube is connected with an anode of the second diode and one end of the input alternating current power supply respectively. A drain electrode of the first switch tube is connected with one end of the load, one end of the capacitor, one end of the inductor and a drain electrode of the second switch tube respectively. The other end of the inductor is connected with a cathode of the second diode and a cathode of the first diode respectively. An anode of the third diode is connected with the other end of the load and the other end of the capacitor respectively. A cathode of the third diode is connected with a source electrode of the second switch tube, an anode of the first diode and the other end of the input alternating current power supply respectively. The BOOST-BUCK-BOOST bridgeless convertor is simple in structure, high in efficiency, easy in control circuit realization, high in power density, high in circuit reliability and low in cost.
Description
Technical field
The utility model relates to AC/DC converter field, is specifically related to a kind of BOOST-BUCK-BOOST without the bridging parallel operation.
Background technology
AC/DC converter commonly used mainly contains single step arrangement and the large class of two-layer configuration two at present, and wherein single step arrangement is generally the converter without bridge AC/DC, and two-layer configuration generally consists of diode rectifier circuit and DC/DC converter.Existingly without bridge AC/DC converter, have the large and strong defect of electromagnetic interference of common mode current, and the two-layer configuration transducer effciency is lower.
The utility model content
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, proposes a kind of BOOST-BUCK-BOOST without the bridging parallel operation.
The utility model adopts following technical scheme:
A kind of BOOST-BUCK-BOOST is without the bridging parallel operation, comprise input ac power, the first switching tube S1, second switch pipe S2, inductance L, the first diode D1, the second diode D2, the 3rd diode D3, capacitor C and load, the source electrode of described the first switching tube S1 respectively with the anode of the second diode D2, one end of input ac power connects, the drain electrode of the first switching tube S1 respectively with an end of load, one end of capacitor C, one end of inductance L, the drain electrode of second switch pipe S2 connects, the other end of inductance L respectively with the negative electrode of the second diode D2, the negative electrode of the first diode D1 connects, the anode of the 3rd diode D3 respectively with the other end of load, the other end of capacitor C connects, the negative electrode of the 3rd diode D3 respectively with the source electrode of second switch pipe S2, the anode of the first diode D1, the other end of input ac power connects.
Form BOOST circuit link by described second switch pipe S2, inductance L and the second diode D2, form BUCK-BOOST circuit link by described the first switching tube S1, inductance L and the first diode D1, by described load, capacitor C and the 3rd diode D3, form the output circuit link.
When described BUCK-BOOST circuit link and the alternation of BOOST circuit link, the sense of current of inductance L is constant.
Compared with prior art, the advantage the utlity model has is:
BOOST circuit link and BUCK-BOOST circuit link are integrated to formation, and BUCK-BOOST circuit link and BOOST circuit link share inductance L, and the sense of current that flows through inductance L during two kinds of circuit alternations is constant, has not only reduced the volume of circuit, and reduced the di/dt in the circuit, in addition, the utility model is simple in structure, and efficiency is high, control circuit is easily realized, power density is high, and circuit reliability is high, and cost is low.
The accompanying drawing explanation
Fig. 1 is that a kind of BOOST-BUCK-BOOST of the present utility model is without bridging parallel operation structure chart;
Fig. 2 is the utility model embodiment input current i in the input voltage one-period under discontinous mode
inwith inductive current i
loscillogram;
Fig. 3 is the utility model embodiment input current i in the input voltage one-period under the continuous current mode pattern
inwith inductive current i
loscillogram;
Fig. 4 a～Fig. 4 e is respectively process chart of the present utility model, and wherein Fig. 4 a is switching tube S2 conducting, equivalent circuit diagram when switching tube S1 turn-offs; Fig. 4 b is that switching tube S1 and switching tube S2 all turn-off and diode D2 conducting, equivalent circuit diagram when diode D1 disconnects; Fig. 4 c is the equivalent circuit diagrams of all semiconductor device while all turn-offing; Fig. 4 d is switching tube S1 conducting, equivalent circuit diagram when switching tube S2 turn-offs; Fig. 4 e is that switching tube S1 and switching tube S2 all turn-off and diode D1 conducting, equivalent circuit diagram when diode D2 disconnects.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited to this.
Embodiment
As shown in Figure 1, a kind of BOOST-BUCK-BOOST, without the bridging parallel operation, comprises BOOST circuit link, BUCK-BOOST circuit link and output circuit link.Described BOOST circuit link consists of second switch pipe S2, inductance L and the second diode D2, described BUCK-BOOST circuit link consists of the first switching tube S1, inductance L and the first diode D1, and described output circuit link consists of load, capacitor C and the 3rd diode D3.
At the positive half cycle of input voltage, circuit working is in the BOOST pattern, at the input voltage negative half period, circuit working is in the BUCK-BOOST pattern, BUCK-BOOST circuit link and BOOST circuit link share inductance L, and the sense of current that flows through inductance L during two kinds of circuit alternations is constant, reduced the di/dt in the circuit.The 3rd diode D3 in the output circuit link flows into the output circuit link in the other direction for blocking the input voltage positive half cycle current.
Physical circuit connects: the source electrode of described the first switching tube S1 respectively with the anode of the second diode D2, one end of input ac power connects, the drain electrode of the first switching tube S1 respectively with an end of load, one end of capacitor C, one end of inductance L, the drain electrode of second switch pipe S2 connects, the other end of inductance L respectively with the negative electrode of the second diode D2, the negative electrode of the first diode D1 connects, the anode of the 3rd diode D3 respectively with the other end of load, the other end of capacitor C connects, the negative electrode of the 3rd diode D3 respectively with the source electrode of second switch pipe S2, the anode of the first diode D1, the other end of input ac power connects.
The utility model is operated in respectively discontinous mode and continuous current mode pattern, realizes in described Fig. 4 a～Fig. 4 e that part means in running order part, equivalent circuit diagram when side circuit figure means work, and detailed process is as follows:
(1) discontinous mode:
At first consider that converter is operated in the situation of the positive half cycle of input voltage;
At the positive half cycle of input voltage, the first switching tube S1 closes always, and the first diode D1 bears the reverse voltage cut-off always, second switch pipe S2, the second diode D2 and the 3rd diode D3 work, now circuit working is in the BOOST pattern, as shown in Fig. 4 a, Fig. 4 b, Fig. 4 c.
When second switch pipe S2 conducting, the converter equivalent circuit diagram is as shown in Fig. 4 a.Now, power supply charges to inductance L, and in inductance L, electric current starts to rise, and the output circuit link is by short circuit, and capacitor C releases energy to load.When second switch pipe S2 disconnects, the converter equivalent circuit diagram as shown in Figure 4 b.Now, power supply and inductance power to the load simultaneously, and to the capacitor C charging, the capacitor C energy storage, in inductance, electric current starts to descend.When in inductance, electric current drops to zero, the converter equivalent circuit diagram is as shown in Fig. 4 c, and now all semiconductor device are not all worked, and capacitor C releases energy to load.
Input current i in this process
inwith inductive current i
loscillogram as in Fig. 2
shown in time period.
When converter is operated in the input voltage negative half period;
At the input voltage negative half period, second switch pipe S2 closes always, and the second diode D2 bears the reverse voltage cut-off always, the first switching tube S1, the first diode D1 and the 3rd diode D3 work, now circuit working is in the BUCK-BOOST pattern, as shown in Fig. 4 d, Fig. 4 e, Fig. 4 c.
When the first switching tube S1 conducting, the converter equivalent circuit diagram is as shown in Fig. 4 d.Now, power supply charges to inductance L, and in inductance L, electric current starts to rise, and the output circuit link is by short circuit, and capacitor C releases energy to load, and the 3rd diode D3 hinders electric current and flows into the output circuit link in the other direction.When the first switching tube S1 disconnects, the converter equivalent circuit diagram is as shown in Fig. 4 e.Now, inductance, by the first diode D1 afterflow, powers to the load simultaneously and charges to capacitor C, the capacitor C energy storage, and in inductance, electric current starts to descend.When in inductance, electric current drops to zero, the converter equivalent circuit diagram is as shown in Fig. 4 c, and now all semiconductor device are not all worked, and capacitor C releases energy to load.
Input current i in this process
inwith inductive current i
loscillogram as in Fig. 2
shown in time period.
(2) converter is operated in the continuous current mode pattern;
When transformer is operated in the positive half cycle of input voltage: the first switching tube S1 closes always, the first diode D1 bears the reverse voltage cut-off always, second switch pipe S2, the second diode D2 and the 3rd diode D3 work, now circuit working is in the BOOST pattern, as shown in Fig. 4 a, Fig. 4 b.
When second switch pipe S2 conducting, the converter equivalent circuit diagram is as shown in Fig. 4 a.Now, power supply is to induction charging, and in inductance, electric current starts to rise, and the output circuit link is by short circuit, and capacitor C releases energy to load.When second switch pipe S2 disconnects, the converter equivalent circuit diagram as shown in Figure 4 b.Now, power supply and inductance power to the load simultaneously, and to the capacitor C charging, the capacitor C energy storage, in inductance, electric current starts to descend.
Input current i in this process
inwith inductive current i
loscillogram as in Fig. 3
shown in time period.
When transformer is operated in the input voltage negative half period:
Second switch pipe S2 closes always, and the second diode D2 bears the reverse voltage cut-off always.The first switching tube S1, the first diode D1 and the 3rd diode D3 work, now circuit working is in the BUCK-BOOST pattern, as shown in Fig. 4 d, Fig. 4 e.
When the first switching tube S1 conducting, the converter equivalent circuit diagram is as shown in Fig. 4 d.Now, power supply is to induction charging, and in inductance, electric current starts to rise, and the output circuit link is by short circuit, and capacitor C releases energy to load, and the 3rd diode D3 hinders electric current and flows into the output circuit link in the other direction.When the first switching tube S1 disconnects, the converter equivalent circuit diagram is as shown in Fig. 4 e.Now, inductance, by the first diode D1 afterflow, powers to the load simultaneously and charges to capacitor C, the capacitor C energy storage, and in inductance, electric current starts to descend.
Input current i in this process
inwith inductive current i
loscillogram as in Fig. 3
shown in time period.
Above-described embodiment is preferably execution mode of the utility model; but execution mode of the present utility model is not limited by the examples; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection range of the present utility model.
Claims (2)
1. a BOOST-BUCK-BOOST, without the bridging parallel operation, is characterized in that, comprises input ac power, the first switching tube (S1), second switch pipe (S2), inductance (L), the first diode (D1), the second diode (D2), the 3rd diode (D3), electric capacity (C) and load, the source electrode of described the first switching tube (S1) respectively with the anode of the second diode (D2), one end of input ac power connects, the drain electrode of the first switching tube (S1) respectively with an end of load, one end of electric capacity (C), one end of inductance (L), the drain electrode of second switch pipe (S2) connects, the other end of inductance (L) respectively with the negative electrode of the second diode (D2), the negative electrode of the first diode (D1) connects, the anode of the 3rd diode (D3) respectively with the other end of load, the other end of electric capacity (C) connects, the negative electrode of the 3rd diode (D3) respectively with the source electrode of second switch pipe (S2), the anode of the first diode (D1), the other end of input ac power connects.
2. a kind of BOOST-BUCK-BOOST according to claim 1 is without the bridging parallel operation, it is characterized in that, form BOOST circuit link by described second switch pipe (S2), inductance (L) and the second diode (D2), form BUCK-BOOST circuit link by described the first switching tube (S1), inductance (L) and the first diode (D1), by described load, electric capacity (C) and the 3rd diode (D3), form the output circuit link.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320353983 CN203368351U (en) | 2013-06-19 | 2013-06-19 | BOOST-BUCK-BOOST bridgeless convertor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320353983 CN203368351U (en) | 2013-06-19 | 2013-06-19 | BOOST-BUCK-BOOST bridgeless convertor |
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| Publication Number | Publication Date |
|---|---|
| CN203368351U true CN203368351U (en) | 2013-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320353983 Expired - Fee Related CN203368351U (en) | 2013-06-19 | 2013-06-19 | BOOST-BUCK-BOOST bridgeless convertor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337973A (en) * | 2013-06-19 | 2013-10-02 | 华南理工大学 | BOOST-BUCK-BOOST bridgeless convertor |
| CN105529924A (en) * | 2016-01-31 | 2016-04-27 | 华南理工大学 | Quasi Z-source buck DC-DC conversion circuit |
-
2013
- 2013-06-19 CN CN 201320353983 patent/CN203368351U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337973A (en) * | 2013-06-19 | 2013-10-02 | 华南理工大学 | BOOST-BUCK-BOOST bridgeless convertor |
| CN103337973B (en) * | 2013-06-19 | 2016-01-06 | 华南理工大学 | A kind of BOOST-BUCK-BOOST is without bridging parallel operation |
| CN105529924A (en) * | 2016-01-31 | 2016-04-27 | 华南理工大学 | Quasi Z-source buck DC-DC conversion circuit |
| CN105529924B (en) * | 2016-01-31 | 2018-06-22 | 华南理工大学 | A kind of quasi- Z sources buck DC-DC translation circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131225 Termination date: 20170619 |