CN114070071B - Efficient bidirectional DC-DC converter - Google Patents
Efficient bidirectional DC-DC converter Download PDFInfo
- Publication number
- CN114070071B CN114070071B CN202111536718.9A CN202111536718A CN114070071B CN 114070071 B CN114070071 B CN 114070071B CN 202111536718 A CN202111536718 A CN 202111536718A CN 114070071 B CN114070071 B CN 114070071B
- Authority
- CN
- China
- Prior art keywords
- circuit
- converter
- inductor
- external
- resonant circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 76
- 239000003990 capacitor Substances 0.000 claims abstract description 70
- 238000004804 winding Methods 0.000 claims abstract description 27
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
Abstract
The invention discloses a high-efficiency bidirectional DC-DC converter, which comprises an inverter circuit, a resonant circuit, a selection circuit, a transformer and a rectification circuit, wherein the resonant circuit comprises a first inductor, a second inductor and a first capacitor, one end of the second inductor is connected with one end of the first capacitor and one end of the first inductor, the other ends of the second inductor and the first capacitor are used as first connecting ends of the resonant circuit, the other ends of the second inductor and the other ends of the first inductor are used as second connecting ends of the resonant circuit, the selection circuit is connected with the resonant circuit, the first connecting ends are connected with the inverter circuit in a first state, the second connecting ends are connected with a primary winding of the transformer, the second connecting ends are connected with the inverter circuit in a second state, the first connecting ends are connected with the transformer, a secondary winding of the transformer is connected with an input side of the rectification circuit, and an output side of the rectification circuit and an input side of the inverter circuit are respectively used as a second external connecting end and a first external connecting end of the high-efficiency bidirectional DC-DC converter.
Description
Technical Field
The invention relates to the technical field of power supply conversion, in particular to a high-efficiency bidirectional DC-DC converter.
Background
The DC-DC converter is a direct current/direct current converter capable of adjusting energy to be transmitted bidirectionally according to requirements, and is mainly applied to occasions such as an energy storage system, a vehicle-mounted power supply system, a feedback charge-discharge system, a hybrid energy electric vehicle and the like.
In the traditional LLC resonant DC-DC converter, the ZVS conduction of the primary side switching tube and the ZCS conduction of the rectifying side diode can be realized no matter the forward and reverse operation, but when the energy flows reversely, the circuit characteristic is not LLC resonant characteristic but is degenerated into LC resonant characteristic, the maximum voltage gain of the LC resonance becomes 1, the voltage gain in the reverse operation is greatly reduced, the output voltage range is greatly narrowed, and the converter is not suitable for the state of the bidirectional flow of the energy in a wide range, and the application scene is limited.
Disclosure of Invention
The invention aims to solve the technical problem of providing the efficient bidirectional DC-DC converter which has small loss during forward and reverse operation and can improve the output voltage range.
In order to solve the technical problems, the invention provides a high-efficiency bidirectional DC-DC converter, which comprises an inverter circuit, a resonant circuit, a selection circuit, a transformer and a rectification circuit, wherein the resonant circuit comprises a first inductor, a second inductor and a first capacitor, one end of the second inductor is connected with one end of the first capacitor and one end of the first inductor, the other end of the second inductor and the other end of the first capacitor are used as first connection ends of the resonant circuit, the other end of the second inductor and the other end of the first inductor are used as second connection ends of the resonant circuit, the selection circuit is connected with the resonant circuit, so that the first connection ends of the resonant circuit are connected with the inverter circuit when the high-efficiency bidirectional DC-DC converter works in a first state, the second connection ends are connected with primary windings of the transformer, the second connection ends of the resonant circuit are connected with the inverter circuit when the second state, the secondary windings of the transformer are connected with the input sides of the rectification circuit, the output sides of the rectification circuit and the input sides of the inverter circuit are respectively used as second connection ends of the high-efficiency DC-DC converter and the first connection ends, and the second connection ends are externally connected with the second connection ends when the high-efficiency bidirectional DC-DC converter works in a second state, and the external connection ends are externally connected with the first connection ends, and the second connection ends are externally connected with the second connection ends.
The further technical scheme is as follows: the selection circuit comprises a first selection switch and a second selection switch, wherein the common end and the normally closed end of the first selection switch are connected between the inverter circuit and the resonance circuit, the common end and the normally closed end of the second selection switch are connected between the transformer and the resonance circuit, the Chang Biduan and the normally open end of the second selection switch are respectively connected with the normally open end and the normally closed end of the first selection switch, the common ends of the first selection switch and the second selection switch are both connected with the normally closed end of the first selection switch in a first state, and the common ends of the first selection switch and the second selection switch are both connected with the normally open end of the second selection switch in a second state so that the first connection end of the resonance circuit is connected with the inverter circuit when the efficient bidirectional DC-DC converter works in the first state, the second connection end of the resonance circuit is connected with the primary winding of the transformer, and the second connection end of the resonance circuit is connected with the inverter circuit in the second state.
The further technical scheme is as follows: the inverter circuit comprises two switching tubes, wherein the two switching tubes are connected in series to form a bridge arm, two ends of the bridge arm are used as first external connection ends of the efficient bidirectional DC-DC converter, and the first connection end/the second connection end is connected to the midpoint and the bottommost end of the bridge arm; and the resonant circuit further comprises a second capacitor, and the second capacitor is connected between the common terminal of the first selection switch and the inverter circuit or between the second inductor and the inverter circuit.
The further technical scheme is as follows: the inverter circuit comprises two switching tubes, the two switching tubes are connected in series to form a bridge arm, two ends of the bridge arm are used as first external connection ends of the efficient bidirectional DC-DC converter, and the first connection end/the second connection end is connected to the uppermost end and the midpoint of the bridge arm; and the resonant circuit further comprises a second capacitor, and the second capacitor is connected between the common terminal of the first selection switch and the inverter circuit or between the second inductor and the inverter circuit.
The further technical scheme is as follows: the inverter circuit comprises four switching tubes, each two switching tubes are connected in series to form a bridge arm, two ends of each two bridge arms are used as first external connection ends of the efficient bidirectional DC-DC converter after being connected in parallel, and the first connection ends/the second connection ends are connected to midpoints of the two bridge arms.
The further technical scheme is as follows: the inverter circuit comprises two capacitors and two switching tubes, wherein the two capacitors and the two switching tubes are respectively connected in series to form a bridge arm, two ends of the two bridge arms after being connected in parallel serve as first external connection ends of the bidirectional converter, and the first connection ends/the second connection ends are connected to midpoints of the two bridge arms.
The further technical scheme is as follows: the rectification circuit comprises four switching tubes, each two switching tubes are connected in series to form a bridge arm, two ends of each two bridge arms are used as second external connection ends of the efficient bidirectional DC-DC converter after being connected in parallel, and the homonymous end and the heteronymous end of the secondary winding of the transformer are respectively connected to the midpoints of the two bridge arms.
The further technical scheme is as follows: the high-efficiency bidirectional DC-DC converter further comprises a first filter capacitor and a second filter capacitor, wherein two ends of the first filter capacitor are connected to the input side of the inverter circuit, and two ends of the second filter capacitor are connected to the output side of the rectifying circuit.
In order to solve the technical problems, the invention further provides a high-efficiency bidirectional DC-DC converter, which comprises an inverter circuit, a resonant circuit, a selection circuit, a transformer and a rectification circuit, wherein the resonant circuit comprises a first inductor, a second inductor and a first capacitor, two ends of the first capacitor are respectively connected with one ends of the first inductor and the second inductor, the other ends of the first inductor and the second inductor are used as first connecting ends of the resonant circuit, two ends of the second inductor are used as second connecting ends of the resonant circuit, the selection circuit is connected with the resonant circuit, so that the first connecting ends of the resonant circuit are connected with the inverter circuit when the high-efficiency bidirectional DC-DC converter works in a first state, the second connecting ends are connected with a primary winding of the transformer, the second connecting ends of the resonant circuit are connected with the inverter circuit when the second state, the first connecting ends of the primary winding of the transformer are connected with an input side of the rectification circuit, and the output side of the rectification circuit and the input side of the inverter circuit are respectively used as second connecting ends of the resonant circuit, the selection circuit is connected with the first external end and the second external end of the high-efficiency bidirectional DC-DC converter, and the second external power is connected with the second external end when the first external end and the second end of the high-efficiency bidirectional DC-DC converter is connected with the first external end, and the second external end, and the external end is connected with the external end.
In order to solve the technical problems, the invention also provides a high-efficiency bidirectional DC-DC converter, which comprises an inverter circuit, a resonant circuit, a selection circuit, a transformer and a rectifying circuit, wherein the resonant circuit comprises a first inductor, a second inductor and a first capacitor, two ends of the second inductor are respectively connected with one end of the first capacitor and one end of the first inductor, the other ends of the first capacitor and the first inductor are used as a first connecting end of the resonant circuit, two ends of the second inductor are used as a second connecting end of the resonant circuit, the selection circuit is connected with the resonant circuit, so that the first connecting end of the resonant circuit is connected with the inverter circuit when the high-efficiency bidirectional DC-DC converter works in a first state, the second connecting end is connected with the primary winding of the transformer, the second connecting end of the resonant circuit is connected with the inverter circuit in the second state, the first connecting end is connected with the primary winding of the transformer, the secondary winding of the transformer is connected with the input side of the rectifying circuit, the output side of the rectifying circuit and the input side of the inverter circuit are respectively used as the second external end and the first external end of the efficient bidirectional DC-DC converter, in the first state, electric power is transmitted from the first external end to the second external end, and in the second state, electric power is transmitted from the second external end to the first external end.
Compared with the prior art, the equivalent circuits of the resonant circuit in the high-efficiency bidirectional DC-DC converter are multi-element resonant circuits when energy flows forward and backward, soft switching is realized when the resonant circuit works forward and backward, the loss is small, and the problem that the reverse gain of the traditional LLC resonant circuit is small is solved, namely, the high-efficiency bidirectional DC-DC converter can boost when energy flows backward, the output voltage range of the converter can be effectively improved, and the output of a wide voltage range is realized.
Drawings
Fig. 1 is a circuit schematic of a first embodiment of the high efficiency bi-directional DC-DC converter of the present invention.
Fig. 2 is a circuit schematic of a second embodiment of the high efficiency bi-directional DC-DC converter of the present invention.
Fig. 3 is a circuit schematic of a third embodiment of the high efficiency bi-directional DC-DC converter of the present invention.
Fig. 4 is a circuit schematic of a fourth embodiment of the high efficiency bi-directional DC-DC converter of the present invention.
Fig. 5 is a circuit schematic of a fifth embodiment of the high efficiency bi-directional DC-DC converter of the present invention.
Detailed Description
The present invention will be further described with reference to the drawings and examples below in order to more clearly understand the objects, technical solutions and advantages of the present invention to those skilled in the art.
Referring to fig. 1, fig. 1 is a circuit schematic of a first embodiment of a high efficiency bi-directional DC-DC converter 10 according to the present invention. In the embodiment shown in the drawings, the efficient bidirectional DC-DC converter 10 comprises an inverter circuit 11, a resonant circuit 12, a selection circuit, a transformer T1 and a rectifying circuit 14, wherein the resonant circuit 12 comprises a first inductor L1, a second inductor L2 and a first capacitor C1, one end of the second inductor L2 is connected to the first capacitor C1 and one end of the first inductor L1, the other end of the second inductor L2 and the first capacitor C1 are used as a first connection end of the resonant circuit 12, the other end of the second inductor L2 and the other end of the first inductor L1 are used as a second connection end of the resonant circuit 12, the selection circuit is connected to the resonant circuit 12, so that the first connection end of the resonant circuit 12 is connected to the inverter circuit 11, the second connection end is connected to the primary winding of the transformer T1 when the efficient bidirectional DC-DC converter 10 is operated in the first state, in the second state, the first connection end of the resonant circuit 12 is connected to the primary winding of the transformer T1, the second connection end is connected to the inverter circuit 11, the secondary winding of the transformer T1 is connected to the input side of the rectifying circuit 14, the output side of the rectifying circuit 14 and the input side of the inverter circuit 11 are respectively used as the first external connection end and the second external connection end of the efficient bidirectional DC-DC converter 10 to connect a load and a power supply, in the first state, electric power is transmitted from the first external connection end to the second external connection end, in the second state, electric power is transmitted from the second external connection end to the first external connection end, that is, the working state of the efficient bidirectional DC-DC converter 10 is the first state when energy flows forward, and the working state of the efficient bidirectional DC-DC converter 10 is the second state when energy flows backward. Preferably, the inductance of the first inductor L1 and the second inductor L2 is the same.
In this embodiment, when energy flows in the forward direction, the first external connection end of the efficient bidirectional DC-DC converter 10 is used as a DC input end, and can be externally connected with a power supply, and the second external connection end is used as a DC output end, and can be externally connected with a load; when energy flows reversely, the second external terminal of the efficient bidirectional DC-DC converter 10 is used as a DC input terminal, and the first external terminal is used as a DC output terminal. The equivalent circuits of the resonant circuit 12 in the high-efficiency bidirectional DC-DC converter 10 are multi-element resonant circuits when energy flows forward and backward, soft switching can be realized when the resonant circuits work forward and backward, the loss is smaller, the gain is the same, the problem that the reverse gain of the traditional LLC resonant circuit is smaller is solved, namely, the resonant circuits can be boosted when energy flows backward, the output voltage range of the converter can be effectively increased, the output of a wide voltage range is realized, and the high-efficiency bidirectional DC-DC converter is applicable to a high-power circuit.
Specifically, in this embodiment, the selection circuit includes a first selection switch S1 and a second selection switch S2, where the common terminal and the normally-closed terminal of the first selection switch S1 are connected between the inverter circuit 11 and the resonance circuit 12, the common terminal and the normally-closed terminal of the second selection switch S2 are connected between the transformer T1 and the resonance circuit 11, and the normally-closed terminal and the normally-open terminal of the second selection switch S2 are respectively connected to the normally-open terminal and the normally-closed terminal of the first selection switch S1, the common terminal of the first selection switch S1 and the common terminal of the second selection switch S2 are both connected to the normally-closed terminal thereof in the first state, and the common terminal of the first selection switch S1 and the common terminal of the second selection switch S2 are both connected to the normally-open terminal thereof in the second state, so that the first connection terminal of the resonance circuit 12 is connected to the inverter circuit 11 when the high-efficiency bidirectional DC-DC converter 10 is operated in the first state, the second connection terminal is connected to the primary winding of the transformer T1, and the second connection terminal of the resonance circuit 12 is connected to the primary winding of the high-efficiency bidirectional DC-DC converter 10 when the high-DC converter is enabled to flow in the first state.
In some embodiments, the inverter circuit 11 is in a full-bridge structure, and includes a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, and a fourth switching tube Q4, where each two switching tubes are connected in series to form a bridge arm, two ends of each two bridge arms are used as first external terminals of the high-efficiency bidirectional DC-DC converter 10 after the two bridge arms are connected in parallel, specifically, when the high-efficiency bidirectional DC-DC converter 10 is operated in a first state, a midpoint of a bridge arm formed by connecting the first switching tube Q1 and the second switching tube Q2 in series is connected with the first capacitor C1 through a selection circuit, a midpoint of a bridge arm formed by connecting the third switching tube Q3 and the fourth switching tube Q4 in series is connected with the second inductor L2, and in a second state, a midpoint of a bridge arm formed by connecting the first switching tube Q1 and the second switching tube Q2 in series is connected with the midpoint of a bridge arm formed by connecting the third switching tube Q3 and the fourth switching tube Q4 in series is connected with the first inductor L1 and the second inductor L2 respectively.
In the embodiment shown in the drawings, the rectifying circuit 14 includes a fifth switching tube Q5, a sixth switching tube Q6, a seventh switching tube Q7, and an eighth switching tube Q8, where each two switching tubes are connected in series to form a bridge arm, and two ends of each two bridge arms are used as second external ends of the high-efficiency bidirectional DC-DC converter 10 after being connected in parallel, where a midpoint of a bridge arm formed by connecting the fifth switching tube Q5 and the sixth switching tube Q6 in series and a midpoint of a bridge arm formed by connecting the seventh switching tube Q7 and the eighth switching tube Q8 in series are connected with a homonymous end and a heteronymous end of the secondary winding of the transformer T1 respectively. Based on this design, the rectifying circuit 14 can rectify the voltage waveform periodically output from the transformer T1 to generate the operating voltage required by the load when energy flows in the forward direction. Preferably, the switching tubes are selected from MOS, IGBT or other controllable power switching tubes to achieve better circuit performance, and in some embodiments, a diode may be further connected in parallel to each switching tube, and if the switching tube is selected from MOS, a diode is connected in parallel between the drain and the source, and if the switching tube is selected from IGBT, a diode is connected in parallel between the emitter and the collector.
Further, the efficient bidirectional DC-DC converter 10 further includes a first filter capacitor C3 and a second filter capacitor C4, where two ends of the first filter capacitor C3 are connected to the input side of the inverter circuit 11, and two ends of the second filter capacitor C4 are connected to the output side of the rectifier circuit 14.
In this embodiment, during forward energy transmission, the switching frequencies of the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4 are controlled to realize wide-range voltage output of the efficient bidirectional DC-DC converter 10, and the two switching tubes on each bridge arm are complementarily turned on, so that a circuit soft switch can be realized; when energy is reversely transmitted, the equivalent circuit of the resonant circuit 12 is also a multi-element resonant circuit, so that the switching frequency of the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7 and the eighth switching tube Q8 can be controlled to realize the same wide-range voltage output as that in the forward transmission, and the two switching tubes on each bridge arm are complementarily conducted, so that the circuit soft switching can be realized.
Referring to fig. 2, fig. 2 is a circuit schematic diagram of a second embodiment of the efficient bidirectional DC-DC converter 10 according to the present invention, which is different from the first embodiment in the specific structure of the inverter circuit 11, and the other circuit structures are the same or similar. In this embodiment, the inverter circuit 11 includes two capacitors and two switching tubes, where the two capacitors and the two switching tubes are respectively connected in series to form a bridge arm, each two switching tubes are connected in series to form a bridge arm, two ends of the two bridge arms after being connected in parallel are used as a first external connection end of the high-efficiency bidirectional DC-DC converter 10, specifically, the inverter circuit includes a first switching tube Q1, a second switching tube Q2, a fifth capacitor C5 and a sixth capacitor C6, the first connection end/the second connection end is connected to a midpoint of the two bridge arms, that is, when the high-efficiency bidirectional DC-DC converter 10 works in a first state, through a selection circuit, the first connection end, that is, the second inductor L2 is connected to a midpoint of the bridge arm formed by connecting the fifth capacitor C5 and the sixth capacitor C6 in series, and the first capacitor C1 is connected to a midpoint of the bridge arm formed by connecting the first switching tube Q1 and the second switching tube Q2 in series; in the second state, the second connection end is connected to the middle point of the two bridge arms through the selection circuit. The resonant circuits 12 in the efficient bidirectional DC-DC converter 10 in this embodiment are the same in the forward and reverse energy circulation, and are three-element resonant circuits, so that the loss is small, the output voltage range of the converter 10 can be effectively increased, and the output of a wide voltage range can be realized.
Referring to fig. 3, fig. 3 is a schematic circuit diagram of a third embodiment of the efficient bidirectional DC-DC converter 10 according to the present invention, which is different from the first embodiment in the specific structure of the resonant circuit 12, and the rest of the circuit structures are the same or similar. In this embodiment, the resonant circuit 12 includes a first capacitor C1, a first inductor L1, and a second inductor L2, two ends of the first capacitor C1 are respectively connected to one ends of the first inductor L1 and the second inductor L2, the other ends of the first inductor L1 and the second inductor L2 are used as a first connection end of the resonant circuit 12, and two ends of the second inductor L2 are used as a second connection end of the resonant circuit 12. It can be understood that in some other embodiments, two capacitors may be used to replace two series connection structures in the inverter circuit 11, so that the resonant circuits in the efficient bidirectional DC-DC converter 10 of the present embodiment are the same in equivalent circuit when energy flows forward and backward, and are three-element resonant circuits, so that the loss is small, the gain is the same, the output voltage range of the converter 10 can be effectively increased, and the output of a wide voltage range can be realized.
Referring to fig. 4, fig. 4 is a circuit schematic diagram of a fourth embodiment of the efficient bidirectional DC-DC converter 10 of the present invention, which is different from the first embodiment in that the specific structure of the inverter circuit 11 and the resonance circuit 12 is different, and the rest of the circuit structures are the same or similar. In this embodiment, the resonant circuit 12 includes a first inductor L1, a second inductor L2, and a first capacitor C1, one end of the second inductor L2 is connected to one ends of the first capacitor C1 and the first inductor L1, the other ends of the second inductor L2 and the first capacitor C1 are used as first connection ends of the resonant circuit 12, the other ends of the second inductor L2 and the other ends of the first inductor L1 are used as second connection ends of the resonant circuit 12, the inverter circuit 11 is a half-bridge inverter circuit, the half-bridge inverter circuit includes a first switching tube Q1 and a second switching tube Q2, the first switching tube Q1 and the second switching tube Q2 are connected in series to form a bridge arm, two ends of the bridge arm are used as first external connection ends of the high-efficiency bidirectional DC-DC converter 10, and the first connection ends/the second connection ends are connected to the uppermost ends and the middle points of the high-efficiency bidirectional DC-DC converter 10, that is, when the high-efficiency bidirectional DC-DC converter 10 works in the first state, the first inductor C1 and the second inductor L2 are respectively connected to the uppermost ends and the second connection ends of the first inductor L2 through a selection circuit, respectively. It will be appreciated that in some other embodiments, the first/second connection may also be connected to the midpoint and lowermost ends of the bridge arms, as well as achieve a wide voltage range output. Preferably, in this embodiment, the resonant circuit 12 further includes a second capacitor C2, and the second capacitor C2 is connected between the common terminal of the first selection switch S1 and the inverter circuit 11, and in some other embodiments, the second capacitor C2 may be connected between the second inductor L2 and the inverter circuit 11. It can be seen that the present embodiment can also effectively increase the output voltage range of the converter 10, and realize wide voltage range output.
Referring to fig. 5, fig. 5 is a circuit schematic diagram of a fifth embodiment of the efficient bidirectional DC-DC converter 10 according to the present invention, wherein the specific structure of the resonant circuit 12 and the connection manner with the inverter circuit 11 are different from those of the fourth embodiment, and the other circuit structures are the same or similar. In this embodiment, the resonant circuit 12 includes a first inductor L1, a second inductor L2, and a first capacitor C1, two ends of the second inductor L2 are respectively connected to one end of the first capacitor C1 and one end of the first inductor L1, the other ends of the first capacitor C1 and the first inductor L1 are used as first connection ends of the resonant circuit 12, two ends of the second inductor L2 are used as second connection ends of the resonant circuit 12, and the first connection ends/the second connection ends are connected to a midpoint and a bottommost end of a bridge arm, that is, when the efficient bidirectional DC-DC converter 10 works in a first state, the first capacitor C1 and the first inductor L1 are respectively connected to the midpoint and the bottommost end of the bridge arm through a selection circuit, and when in a second state, two ends of the second inductor L2 are respectively connected to the midpoint and the bottommost end of the bridge arm through a selection circuit. Preferably, in this embodiment, the resonant circuit 12 further includes a second capacitor C2, and the second capacitor C2 is connected between the common terminal of the first selection switch S1 and the inverter circuit 11, and in some other embodiments, the second capacitor C2 may be connected between the first inductor L1 and the inverter circuit 11.
In summary, the equivalent circuits of the resonant circuits in the high-efficiency bidirectional DC-DC converter are multi-element resonant circuits when the energy flows forward and backward, soft switching is realized when the resonant circuits work forward and backward, the loss is smaller, the gain is the same, and the problem that the reverse gain of the traditional LLC resonant circuit is smaller is solved, namely, the high-efficiency bidirectional DC-DC converter can boost when the energy flows backward, the output voltage range of the converter can be effectively improved, and the output of a wide voltage range is realized.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Various equivalent changes and modifications can be made by those skilled in the art based on the above embodiments, and all equivalent changes or modifications made within the scope of the claims shall fall within the scope of the present invention.
Claims (10)
1. A high-efficiency bidirectional DC-DC converter is characterized in that: the high-efficiency bidirectional DC-DC converter comprises an inverter circuit, a resonant circuit, a selection circuit, a transformer and a rectifying circuit, wherein the resonant circuit comprises a first inductor, a second inductor and a first capacitor, one end of the second inductor is connected with one end of the first capacitor and one end of the first inductor, the other end of the second inductor and the other end of the first capacitor are used as a first connecting end of the resonant circuit, the other end of the second inductor and the other end of the first inductor are used as a second connecting end of the resonant circuit, the selection circuit is connected with the resonant circuit so that the first connecting end of the resonant circuit is connected with the inverter circuit when the high-efficiency bidirectional DC-DC converter works in a first state, the second connecting end is connected with the primary winding of the transformer, the second connecting end of the resonant circuit is connected with the inverter circuit in the second state, the first connecting end is connected with the primary winding of the transformer, the secondary winding of the transformer is connected with the input side of the rectifying circuit, the output side of the rectifying circuit and the input side of the inverter circuit are respectively used as the second external end and the first external end of the efficient bidirectional DC-DC converter, in the first state, electric power is transmitted from the first external end to the second external end, and in the second state, electric power is transmitted from the second external end to the first external end.
2. The efficient bi-directional DC-DC converter of claim 1 wherein: the selection circuit comprises a first selection switch and a second selection switch, wherein the common end and the normally closed end of the first selection switch are connected between the inverter circuit and the resonance circuit, the common end and the normally closed end of the second selection switch are connected between the transformer and the resonance circuit, the Chang Biduan and the normally open end of the second selection switch are respectively connected with the normally open end and the normally closed end of the first selection switch, the common ends of the first selection switch and the second selection switch are both connected with the normally closed end of the first selection switch in a first state, and the common ends of the first selection switch and the second selection switch are both connected with the normally open end of the second selection switch in a second state so that the first connection end of the resonance circuit is connected with the inverter circuit when the efficient bidirectional DC-DC converter works in the first state, the second connection end of the resonance circuit is connected with the primary winding of the transformer, and the second connection end of the resonance circuit is connected with the inverter circuit in the second state.
3. The efficient bi-directional DC-DC converter of claim 2 wherein: the inverter circuit comprises two switching tubes, wherein the two switching tubes are connected in series to form a bridge arm, two ends of the bridge arm are used as first external connection ends of the efficient bidirectional DC-DC converter, and the first connection end/the second connection end is connected to the midpoint and the bottommost end of the bridge arm; and the resonant circuit further comprises a second capacitor, and the second capacitor is connected between the common terminal of the first selection switch and the inverter circuit or between the second inductor and the inverter circuit.
4. The efficient bi-directional DC-DC converter of claim 2 wherein: the inverter circuit comprises two switching tubes, the two switching tubes are connected in series to form a bridge arm, two ends of the bridge arm are used as first external connection ends of the efficient bidirectional DC-DC converter, and the first connection end/the second connection end is connected to the uppermost end and the midpoint of the bridge arm; and the resonant circuit further comprises a second capacitor, and the second capacitor is connected between the common terminal of the first selection switch and the inverter circuit or between the second inductor and the inverter circuit.
5. The efficient bi-directional DC-DC converter of claim 1 wherein: the inverter circuit comprises four switching tubes, each two switching tubes are connected in series to form a bridge arm, two ends of each two bridge arms are used as first external connection ends of the efficient bidirectional DC-DC converter after being connected in parallel, and the first connection ends/the second connection ends are connected to midpoints of the two bridge arms.
6. The efficient bi-directional DC-DC converter of claim 1 wherein: the inverter circuit comprises two capacitors and two switching tubes, wherein the two capacitors and the two switching tubes are respectively connected in series to form a bridge arm, two ends of the two bridge arms after being connected in parallel serve as first external connection ends of the bidirectional converter, and the first connection ends/the second connection ends are connected to midpoints of the two bridge arms.
7. The efficient bi-directional DC-DC converter of claim 1 wherein: the rectification circuit comprises four switching tubes, each two switching tubes are connected in series to form a bridge arm, two ends of each two bridge arms are used as second external connection ends of the efficient bidirectional DC-DC converter after being connected in parallel, and the homonymous end and the heteronymous end of the secondary winding of the transformer are respectively connected to the midpoints of the two bridge arms.
8. The efficient bi-directional DC-DC converter of claim 1 wherein: the high-efficiency bidirectional DC-DC converter further comprises a first filter capacitor and a second filter capacitor, wherein two ends of the first filter capacitor are connected to the input side of the inverter circuit, and two ends of the second filter capacitor are connected to the output side of the rectifying circuit.
9. A high-efficiency bidirectional DC-DC converter is characterized in that: the high-efficiency bidirectional DC-DC converter comprises an inverter circuit, a resonant circuit, a selection circuit, a transformer and a rectifying circuit, wherein the resonant circuit comprises a first inductor, a second inductor and a first capacitor, two ends of the first capacitor are respectively connected with one ends of the first inductor and the second inductor, the other ends of the first inductor and the second inductor are used as first connecting ends of the resonant circuit, two ends of the second inductor are used as second connecting ends of the resonant circuit, the selection circuit is connected with the resonant circuit, when the high-efficiency bidirectional DC-DC converter works in a first state, the first connecting ends of the resonant circuit are connected with the inverter circuit, the second connecting ends are connected with primary windings of the transformer, when the resonant circuit works in a second state, the second connecting ends of the resonant circuit are connected with the inverter circuit, the first connecting ends are connected with primary windings of the transformer, the secondary windings of the transformer are connected with the input side of the rectifying circuit, the output side of the rectifying circuit and the input side of the inverter circuit are respectively used as second external ends and first ends of the high-efficiency bidirectional DC-DC converter, when the high-efficiency bidirectional DC-DC converter works in a first state, the first external power is transmitted from the first external connection end to the first external connection end, and the second external connection end is connected with the first external connection end when the first external connection end is in a first state, and the external connection state.
10. A high-efficiency bidirectional DC-DC converter is characterized in that: the high-efficiency bidirectional DC-DC converter comprises an inverter circuit, a resonant circuit, a selection circuit, a transformer and a rectifying circuit, wherein the resonant circuit comprises a first inductor, a second inductor and a first capacitor, two ends of the second inductor are respectively connected with one end of the first capacitor and one end of the first inductor, the other ends of the first capacitor and the first inductor are used as first connecting ends of the resonant circuit, two ends of the second inductor are used as second connecting ends of the resonant circuit, the selection circuit is connected with the resonant circuit, so that the first connecting ends of the resonant circuit are connected with the inverter circuit when the high-efficiency bidirectional DC-DC converter works in a first state, the second connecting ends of the resonant circuit are connected with the primary winding of the transformer, the second connecting ends of the resonant circuit are connected with the inverter circuit when the resonant circuit works in a second state, the secondary winding of the transformer is connected with the input side of the rectifying circuit, the output side of the rectifying circuit and the input side of the inverter circuit are respectively used as a second external end and a first end of the high-efficiency bidirectional DC-DC converter, and the first external power is transmitted from the first external end to the second external end when the first external end is connected with the first external end, and the second external end is connected with the first external end when the first external end is in a state, and the second power is transmitted from the first external end to the external end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111536718.9A CN114070071B (en) | 2021-12-15 | Efficient bidirectional DC-DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111536718.9A CN114070071B (en) | 2021-12-15 | Efficient bidirectional DC-DC converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114070071A CN114070071A (en) | 2022-02-18 |
| CN114070071B true CN114070071B (en) | 2024-06-07 |
Family
ID=
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206992959U (en) * | 2017-05-17 | 2018-02-09 | 苏州汇川联合动力系统有限公司 | Two-way resonance converter |
| WO2018036315A1 (en) * | 2016-08-23 | 2018-03-01 | 中兴通讯股份有限公司 | Resonant converter and current processing method |
| CN108736733A (en) * | 2018-05-31 | 2018-11-02 | 湖北工业大学 | Two-way DC/DC converters and its control method is isolated in a kind of variable turns ratio |
| CN112688572A (en) * | 2020-12-31 | 2021-04-20 | 王艳萍 | Bidirectional DC-DC converter |
| CN112688573A (en) * | 2020-12-31 | 2021-04-20 | 王艳萍 | High-frequency isolation bidirectional converter |
| CN112688571A (en) * | 2020-12-31 | 2021-04-20 | 王艳萍 | Bidirectional converter |
| CN113037092A (en) * | 2021-03-15 | 2021-06-25 | 天津理工大学 | Three-port bidirectional DC-DC converter and control method thereof |
| CN113162431A (en) * | 2021-04-29 | 2021-07-23 | 深圳深源技术能源有限公司 | High-efficiency bidirectional converter |
| CN217508598U (en) * | 2021-12-15 | 2022-09-27 | 深圳深源技术能源有限公司 | High-efficiency bidirectional DC-DC converter |
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018036315A1 (en) * | 2016-08-23 | 2018-03-01 | 中兴通讯股份有限公司 | Resonant converter and current processing method |
| CN206992959U (en) * | 2017-05-17 | 2018-02-09 | 苏州汇川联合动力系统有限公司 | Two-way resonance converter |
| CN108736733A (en) * | 2018-05-31 | 2018-11-02 | 湖北工业大学 | Two-way DC/DC converters and its control method is isolated in a kind of variable turns ratio |
| CN112688572A (en) * | 2020-12-31 | 2021-04-20 | 王艳萍 | Bidirectional DC-DC converter |
| CN112688573A (en) * | 2020-12-31 | 2021-04-20 | 王艳萍 | High-frequency isolation bidirectional converter |
| CN112688571A (en) * | 2020-12-31 | 2021-04-20 | 王艳萍 | Bidirectional converter |
| CN113037092A (en) * | 2021-03-15 | 2021-06-25 | 天津理工大学 | Three-port bidirectional DC-DC converter and control method thereof |
| CN113162431A (en) * | 2021-04-29 | 2021-07-23 | 深圳深源技术能源有限公司 | High-efficiency bidirectional converter |
| CN217508598U (en) * | 2021-12-15 | 2022-09-27 | 深圳深源技术能源有限公司 | High-efficiency bidirectional DC-DC converter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11496054B2 (en) | High-gain quasi-resonant DC-DC converter based on voltage doubling rectifier circuit | |
| CN216794863U (en) | High-frequency isolation bidirectional DC-DC converter | |
| CN112688571A (en) | Bidirectional converter | |
| CN112688573A (en) | High-frequency isolation bidirectional converter | |
| CN114884365A (en) | Three-phase converter | |
| CN214045456U (en) | High-frequency isolation bidirectional DC-DC converter | |
| WO2024051320A1 (en) | Wide-range efficient isolated bidirectional converter | |
| CN216794864U (en) | Bidirectional DC-DC converter | |
| CN218549756U (en) | Wide-range efficient isolation bidirectional converter | |
| CN216794865U (en) | High-efficiency bidirectional converter | |
| WO2024051317A1 (en) | Three-phase-interleaving extended-range efficient-isolation bidirectional converter | |
| CN111181411B (en) | Variable/fixed bus voltage ultra-wide gain range bidirectional dc/dc converter | |
| CN215222024U (en) | High-efficiency bidirectional converter | |
| CN114070070A (en) | High-efficiency bidirectional converter | |
| CN114070068A (en) | Bidirectional DC-DC converter | |
| CN218549757U (en) | Three-phase staggered wide-range efficient isolation bidirectional converter | |
| CN114070071B (en) | Efficient bidirectional DC-DC converter | |
| CN113162431A (en) | High-efficiency bidirectional converter | |
| CN114884366A (en) | High-frequency isolation bidirectional converter | |
| EP4040661A1 (en) | Soft-switching power converter | |
| CN114900048A (en) | Three-phase bidirectional DC-DC converter | |
| CN217508598U (en) | High-efficiency bidirectional DC-DC converter | |
| CN214045458U (en) | Bidirectional converter | |
| CN216794862U (en) | Bidirectional converter | |
| CN217508600U (en) | High-frequency isolation bidirectional converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |