CN111786553A - Efficient bidirectional four-pipe BUCK-BOOST converter - Google Patents
Efficient bidirectional four-pipe BUCK-BOOST converter Download PDFInfo
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- CN111786553A CN111786553A CN202010767141.1A CN202010767141A CN111786553A CN 111786553 A CN111786553 A CN 111786553A CN 202010767141 A CN202010767141 A CN 202010767141A CN 111786553 A CN111786553 A CN 111786553A
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- tube
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- buck
- switch tube
- boost converter
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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
-
- 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
Abstract
The invention discloses a high-efficiency bidirectional four-tube BUCK-BOOST converter, which comprises a first inductor, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first diode, a second diode, a third diode, a fourth diode and a first relay connected with the first switch tube in parallel; the second relay is connected with the second switch tube in parallel. Compared with the prior art, the invention has the following advantages: in the high-efficiency bidirectional four-tube BUCK-BOOST converter, for a semiconductor device with a conduction requirement, such as a switch tube or a diode, two ends of the semiconductor device are connected with corresponding relays in parallel, when the semiconductor device needs to be conducted, the corresponding relays can be attracted, and because the impedance of the two ends of the relay is reduced after the relay is attracted, the efficiency of the high-efficiency bidirectional four-tube BUCK-BOOST converter is improved, and the high-efficiency bidirectional four-tube BUCK-BOOST converter has fewer used devices, low cost and simple circuit structure.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a high-efficiency bidirectional four-pipe BUCK-BOOST converter.
Background
With the wide application of power electronic technology in social production, the social development further increases the requirements for power density and efficiency of power electronic products or devices, and generally, the schemes for improving the electric energy conversion efficiency are roughly classified into the following two types: 1. power semiconductor devices with lower loss are adopted, such as MOSFET/IGBT tubes with low on-resistance, magnetic cores with low loss and the like; 2. soft switching techniques are used, e.g., moving to full bridge, LLC, etc., resonance techniques. However, the introduction of the scheme 1 causes cost increase, and the introduction of the scheme 2 causes disadvantages such as cost increase, complicated converter structure, and reduced reliability.
Disclosure of Invention
In order to solve the technical problems of high cost, low efficiency, complex structure and the like, the invention provides a high-efficiency bidirectional four-tube BUCK-BOOST converter, which comprises a first inductor, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first diode, a second diode, a third diode and a fourth diode, wherein the positive end of the input voltage of the high-efficiency bidirectional four-tube BUCK-BOOST converter is respectively connected with the first end of the first switch tube and the first end of the first diode, the positive end of the output voltage of the high-efficiency bidirectional four-tube BUCK-BOOST converter is respectively connected with the first end of the second switch tube and the first end of the second diode, the negative end of the input voltage of the high-efficiency bidirectional four-tube BUCK-BOOST converter is respectively connected with the second end of the third switch tube and the second end of the third diode, and the negative end of the output voltage of the high-efficiency bidirectional four-tube BUCK-BOOST converter is respectively connected with the second end of the fourth switch tube and the second end of the fourth switch tube A second terminal of the fourth diode; the first end of the first inductor is respectively connected with the second end of the first switching tube, the second end of the first diode, the first end of the third switching tube and the first end of the third diode; the second end of the first inductor is respectively connected with the second end of the second switching tube, the second end of the second diode, the first end of the fourth switching tube and the first end of the fourth diode; the first relay is connected with the first switch tube in parallel and used for bypassing the first switch tube or the first diode under the condition that the first switch tube or the first diode is conducted; the second relay is connected with the second switch tube in parallel and used for bypassing the second switch tube or the second diode under the condition that the second switch tube or the second diode is conducted. The first relay and the second relay act under a zero-voltage working condition respectively.
As a preferable mode, the present invention further includes a first capacitor and a second capacitor, wherein the first capacitor is respectively connected between the positive terminal and the negative terminal of the input voltage of the high-efficiency bidirectional four-transistor BUCK-BOOST converter; and the second capacitor is respectively connected between the positive end and the negative end of the output voltage of the high-efficiency bidirectional four-tube BUCK-BOOST converter.
The first switching tube, the second switching tube, the third switching tube and the fourth switching tube are MOSFET tubes or IGBT tubes or other controllable semiconductor devices.
Compared with the prior art, the invention has the following advantages: in the high-efficiency bidirectional four-tube BUCK-BOOST converter, for a semiconductor device with a conduction requirement, such as a switch tube or a diode, two ends of the semiconductor device are connected with corresponding relays in parallel, when the semiconductor device needs to be conducted, the corresponding relays can be attracted, and because the impedance of the two ends of the relay is reduced after the relay is attracted, the efficiency of the high-efficiency bidirectional four-tube BUCK-BOOST converter is improved, and the high-efficiency bidirectional four-tube BUCK-BOOST converter has fewer used devices, low cost and simple circuit structure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts;
FIG. 1 is a circuit diagram of an embodiment of a high efficiency bidirectional four-pipe BUCK-BOOST converter of the present invention;
FIG. 2 is a circuit diagram of a first switching tube conduction mode of an embodiment of the high efficiency bi-directional four-tube BUCK-BOOST converter of the present invention operating in a forward BUCK mode;
FIG. 3 is a circuit diagram of a first switching tube off mode of an embodiment of the high efficiency bi-directional four-tube BUCK-BOOST converter of the present invention operating in a forward BUCK mode;
FIG. 4 is a circuit diagram of a fourth switching transistor conducting mode of an embodiment of the high efficiency bidirectional four-transistor BUCK-BOOST converter of the present invention operating in a forward BOOST mode;
FIG. 5 is a circuit diagram of a fourth switching tube off mode of an embodiment of the high efficiency bi-directional four-tube BUCK-BOOST converter of the present invention operating in the forward BOOST mode;
FIG. 6 is a circuit diagram of a second switching tube conduction mode of an embodiment of the high efficiency bi-directional four-tube BUCK-BOOST converter of the present invention operating in a reverse BUCK mode;
FIG. 7 is a circuit diagram of a second switching tube off mode of an embodiment of the high efficiency bi-directional four-tube BUCK-BOOST converter of the present invention operating in a reverse BUCK mode;
FIG. 8 is a circuit diagram of a third switching transistor conducting mode of an embodiment of the high efficiency bi-directional four-transistor BUCK-BOOST converter of the present invention operating in a reverse BOOST mode;
FIG. 9 is a circuit diagram of a third switching transistor OFF mode of an embodiment of the high efficiency bi-directional four-transistor BUCK-BOOST converter of the present invention operating in a reverse BOOST mode;
reference numerals: q1-first switch tube; q2-second switch tube; q3-third switch tube; q4-fourth switching tube; d1 — first diode; d2 — second diode; d3 — third diode; d4 — fourth diode; l1 — first inductance; c1 — first capacitance; c2 second capacitance.
Detailed Description
In order that those skilled in the art will better understand the invention and thus more clearly define the scope of the invention as claimed, it is described in detail below with respect to certain specific embodiments thereof. It should be noted that the following is only a few embodiments of the present invention, and the specific direct description of the related structures is only for the convenience of understanding the present invention, and the specific features do not of course directly limit the scope of the present invention.
Referring to the attached drawings, the invention adopts the following technical scheme that as shown in fig. 1, a high-efficiency bidirectional four-tube BUCK-BOOST converter is used for carrying out voltage reduction or voltage boosting conversion on Vin, the converted voltage is Vo, and the converted voltage can also be subjected to voltage reduction or voltage boosting conversion, and is Vin. The high-efficiency bidirectional four-tube BUCK-BOOST converter of the embodiment comprises a first inductor L1, a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, the positive end of the input voltage of the high-efficiency bidirectional four-tube BUCK-BOOST converter is respectively connected with the drain electrode of the first switch tube Q1 and the cathode of the first diode D1, the positive end of the output voltage of the high-efficiency bidirectional four-tube BUCK-BOOST converter is respectively connected with the drain electrode of the second switch tube Q2 and the cathode electrode of the second diode D2, the negative end of the input voltage of the high-efficiency bidirectional four-tube BUCK-BOOST converter is respectively connected with the source electrode of the third switching tube Q3 and the anode of the third diode D3, the negative end of the output voltage of the high-efficiency bidirectional four-tube BUCK-BOOST converter is respectively connected with the source electrode of a fourth switching tube Q4 and the anode of a fourth diode D4; a first end of the first inductor L1 is connected to the source of the first switch Q1, the anode of the first diode D1, the drain of the third switch Q3 and the cathode of the third diode D3, respectively; a second end of the first inductor L1 is connected to the source of the second switch transistor Q2, the anode of the second diode D2, the drain of the fourth switch transistor Q4, and the cathode of the fourth diode D4, respectively; the circuit also comprises a first relay S1 which is connected with the first switch tube Q1 in parallel and is used for bypassing the first switch tube Q1 (or the first diode D1) under the condition that the first switch tube Q1 or the first diode D1 is conducted; the switch also comprises a second relay S2 which is connected with the second switch tube Q2 in parallel and is used for bypassing the second switch tube Q2 (or the second diode D2) under the condition that the second switch tube Q2 or the second diode D2 is conducted. The first relay S1 and the second relay S2 are operated at a zero voltage condition, respectively.
The high-efficiency bidirectional four-tube BUCK-BOOST converter further comprises a first capacitor C1 and a second capacitor C2, wherein the first capacitor C1 is connected between the positive end and the negative end of the input voltage of the high-efficiency bidirectional four-tube BUCK-BOOST converter respectively; the second capacitor C2 is respectively connected between the positive terminal and the negative terminal of the output voltage of the high-efficiency bidirectional four-tube BUCK-BOOST converter.
The mode of operation of the present invention is described below:
when the high-efficiency bidirectional four-tube BUCK-BOOST converter works in a forward BUCK mode, the fourth switching tube Q4 and the first relay S1 are disconnected, the first switching tube Q1 realizes PWM modulation, the third diode D3 realizes follow current, the second diode D2 has a conduction requirement, and at the moment, the second relay S2 is used for bypassing the second diode D2:
as shown in fig. 2, when the first switch tube Q1 is turned on, a current flows from the positive terminal of the input voltage to the negative terminal of the input voltage through the first switch tube Q1, the first inductor L1, the second relay S2, and the rear stage equivalent load (connected to the output voltage), and the current direction is as shown by the arrow in the figure.
As shown in fig. 3, when the first switching tube Q1 is turned off, the current in the first inductor L1 flows from the second end to the first end of the first inductor L1 through the second relay S2, the rear stage equivalent load and the third diode D3 in sequence, and the current direction is as shown by the arrow in the figure.
When the high-efficiency bidirectional four-tube BUCK-BOOST converter works in a forward BOOST mode, the third diode D3 and the second relay S2 are disconnected, the fourth switching tube Q4 realizes PWM modulation, the second diode D2 realizes follow current, the first switching tube Q1 has a conduction requirement, and at the moment, the first relay S1 is used for bypassing the first switching tube Q1:
as shown in fig. 4, when the fourth switching tube Q4 is turned on, a current flows from the positive terminal of the input voltage to the negative terminal of the input voltage through the first relay S1, the first inductor L1 and the fourth switching tube Q4 in sequence, and the current direction is as indicated by the arrow in the figure.
As shown in fig. 5, when the fourth switching tube Q4 is turned off, the current in the first inductor L1 flows from the second end to the first end of the first inductor L1 through the second diode D2, the rear stage equivalent load and the first relay S1 in sequence, and the current direction is as shown by the arrow in the figure.
When the high-efficiency bidirectional four-tube BUCK-BOOST converter works in a reverse BUCK mode, the third switching tube Q3 and the second relay S2 are disconnected, the second switching tube Q2 realizes PWM modulation, the fourth diode D4 realizes follow current, the first diode D1 has a conduction requirement, and the first relay S1 is used for bypassing the first diode D1:
as shown in fig. 6: when the second switch tube Q2 is turned on, current flows from the positive terminal of the output voltage to the positive terminal of the input voltage through the second switch tube Q2, the first inductor L1 and the first relay S1 in sequence, and the current direction is as indicated by the arrow in the figure.
As shown in fig. 7: when the second switch Q2 is turned off, the current in the first inductor L1 flows from the first end to the second end of the first inductor L1 through the first relay S1, the input power source and the fourth diode D4 in sequence, and the current direction is as indicated by the arrow in the figure.
And fourthly, when the high-efficiency bidirectional four-tube BUCK-BOOST converter works in a reverse BOOST mode, the fourth diode D4 and the first relay S1 are disconnected, the third switch tube Q3 realizes PWM modulation, the first diode D1 realizes follow current, the second switch tube Q2 has a conduction requirement, and at the moment, the second relay S2 is used for bypassing the second switch tube Q2.
As shown in fig. 8, when the third switching tube Q3 is turned on, a current flows from the positive terminal of the output voltage to the negative terminal of the output voltage through the second relay S2, the first inductor L1 and the third switching tube Q3 in this order, and the direction of the current is indicated by an arrow in the figure.
As shown in fig. 9, when the third switching tube Q3 is turned off, the current in the first inductor L1 flows from the first end to the second end of the first inductor L1 through the first diode D1, the input power source and the second relay S2 in sequence, and the current direction is as shown by the arrow in the figure.
In the high-efficiency bidirectional four-tube BUCK-BOOST converter, for a semiconductor device with a conduction requirement, such as a switch tube or a diode, two ends of the semiconductor device are connected with corresponding relays in parallel, when the semiconductor device needs to be conducted, the corresponding relays can be attracted, and because the impedance of the two ends of the relay is reduced after the relay is attracted, the efficiency of the high-efficiency bidirectional four-tube BUCK-BOOS converter is improved. In addition, it should be noted that the lower the contact impedance after the relay is pulled in, the higher the converter efficiency.
It is worth mentioning that, because the relay is switched on and off under the condition of high voltage or large current, contact adhesion may occur, therefore, the first relay S1 and the second relay S2 respectively act under the zero voltage working condition, namely after the semiconductor devices of the bypasses of the first relay S1 and the second relay S2 are respectively switched on, the corresponding relay is pulled in under the condition that the voltages at two ends of the corresponding relay contact are approximately 0, so that the reliability of the relay can be ensured, and the service life of the relay is prolonged.
As shown in fig. 2 and 3, when the second relay S2 is pulled in, it is ensured that the second switch tube Q2 is turned on first because: when the second switch tube Q2 is turned on, the voltage difference between the two ends of the second relay S2 is almost zero, i.e., the voltage of the second diode D2 is negligible, and then the second relay S2 is pulled in. When the second relay S2 is turned off, it is ensured that the second switching tube Q2 is turned off later than the second relay S2.
Similarly, as shown in fig. 4 and 5, when the first relay S1 is closed, it is ensured that the first switching tube Q1 is turned on first, and when the first relay S1 is turned off, it is ensured that the first switching tube Q1 is turned off later than the first relay S1.
Similarly, as shown in fig. 6 and 7, when the first relay S1 is pulled in, it is ensured that the first switch tube Q1 is turned on first because: when the first switch Q1 is turned on, the voltage difference between the two ends of the first relay S1 is almost zero, i.e., the voltage of the first diode D1 is negligible, and then the first relay S1 is pulled in. When the first relay S1 is turned off, it is ensured that the first switching tube Q1 is turned off later than the first relay S1.
Similarly, as shown in fig. 8 and 9, when the second relay S2 is pulled in, the second switch tube Q2 is ensured to be opened first; when the second relay S2 is turned off, it is ensured that the second switching tube Q2 is turned off later than the second relay S2.
The first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 are MOSFET tubes, IGBT tubes or other controllable semiconductor devices.
The above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and variations, modifications, additions and substitutions which may be made by those skilled in the art within the spirit of the present invention are within the scope of the present invention.
Claims (4)
1. A high-efficiency bidirectional four-tube BUCK-BOOST converter comprises a first inductor, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first diode, a second diode, a third diode and a fourth diode, the positive end of the input voltage of the high-efficiency bidirectional four-tube BUCK-BOOST converter is respectively connected with the first end of the first switch tube and the first end of the first diode, the positive end of the output voltage of the high-efficiency bidirectional four-tube BUCK-BOOST converter is respectively connected with the first end of the second switch tube and the first end of the second diode, the negative end of the input voltage of the high-efficiency bidirectional four-tube BUCK-BOOST converter is respectively connected with the second end of the third switching tube and the second end of the third diode, the negative end of the output voltage of the high-efficiency bidirectional four-tube BUCK-BOOST converter is respectively connected with the second end of the fourth switching tube and the second end of the fourth diode; the first end of the first inductor is respectively connected with the second end of the first switching tube, the second end of the first diode, the first end of the third switching tube and the first end of the third diode; the second end of the first inductor is respectively connected with the second end of the second switching tube, the second end of the second diode, the first end of the fourth switching tube and the first end of the fourth diode;
the method is characterized in that: the first relay is connected with the first switch tube in parallel and used for bypassing the first switch tube or the first diode under the condition that the first switch tube or the first diode is conducted;
the second relay is connected with the second switch tube in parallel and used for bypassing the second switch tube or the second diode under the condition that the second switch tube or the second diode is conducted.
2. The high-efficiency bi-directional four-pipe BUCK-BOOST converter as claimed in claim 1, wherein: the first relay and the second relay act under a zero-voltage working condition respectively.
3. The high-efficiency bi-directional four-pipe BUCK-BOOST converter according to claim 1 or 2, wherein: the high-efficiency bidirectional four-tube BUCK-BOOST converter further comprises a first capacitor and a second capacitor, wherein the first capacitor is respectively connected between the positive end and the negative end of the input voltage of the high-efficiency bidirectional four-tube BUCK-BOOST converter; and the second capacitor is respectively connected between the positive end and the negative end of the output voltage of the high-efficiency bidirectional four-tube BUCK-BOOST converter.
4. The high-efficiency bi-directional four-pipe BUCK-BOOST converter as claimed in claim 1, wherein: the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are MOSFET tubes or IGBT tubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010767141.1A CN111786553A (en) | 2020-08-03 | 2020-08-03 | Efficient bidirectional four-pipe BUCK-BOOST converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010767141.1A CN111786553A (en) | 2020-08-03 | 2020-08-03 | Efficient bidirectional four-pipe BUCK-BOOST converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315375A (en) * | 2021-05-10 | 2021-08-27 | 江苏阿诗特能源科技有限公司 | Bidirectional BUCK-BOOST circuit and method based on battery charging and discharging |
| CN116526618A (en) * | 2023-04-28 | 2023-08-01 | 江西星能装备技术发展有限公司 | Control method, device and system of bidirectional charge-discharge circuit |
| CN117240094A (en) * | 2023-11-09 | 2023-12-15 | 宁德时代新能源科技股份有限公司 | Control method, battery system, device, equipment and medium for DC/DC converter |
-
2020
- 2020-08-03 CN CN202010767141.1A patent/CN111786553A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315375A (en) * | 2021-05-10 | 2021-08-27 | 江苏阿诗特能源科技有限公司 | Bidirectional BUCK-BOOST circuit and method based on battery charging and discharging |
| CN116526618A (en) * | 2023-04-28 | 2023-08-01 | 江西星能装备技术发展有限公司 | Control method, device and system of bidirectional charge-discharge circuit |
| CN117240094A (en) * | 2023-11-09 | 2023-12-15 | 宁德时代新能源科技股份有限公司 | Control method, battery system, device, equipment and medium for DC/DC converter |
| CN117240094B (en) * | 2023-11-09 | 2024-04-02 | 宁德时代新能源科技股份有限公司 | Control method, battery system, device, equipment and medium for DC/DC converter |
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