CN217388560U - Bidirectional transformation structure suitable for split-phase power grid - Google Patents
Bidirectional transformation structure suitable for split-phase power grid Download PDFInfo
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Abstract
The utility model provides a two-way transform structure suitable for phase splitting electric wire netting, including direct current bus filter circuit, direct current side switch circuit, clamp circuit, inverter circuit, auxiliary switch spare, first output power line, second output power line, third output power line, direct current bus filter circuit and direct current side switch circuit, clamp circuit connects, clamp circuit and direct current side switch circuit, inverter circuit connects, auxiliary switch spare is in direct current bus filter circuit and clamp circuit junction, inverter circuit is connected with first live wire through first output power line, inverter circuit passes through the second output power line and is connected with the second live wire, auxiliary switch spare passes through the third output power line and is connected with the zero line. The utility model discloses the dc-to-ac converter of application this structure can be applicable to single-phase electric wire netting and phase splitting electric wire netting simultaneously to can control the output current and the phase difference of each looks when it is connected with the phase splitting electric wire netting.
Description
Technical Field
The utility model relates to a power electronic converter technical field especially relates to a two-way transform structure suitable for phase splitting electric wire netting.
Background
The inverter is a converter which converts direct current electric energy (batteries and storage batteries) into constant-frequency constant-voltage or frequency-modulation voltage-regulation alternating current (generally 220V,50Hz sine wave). Since the inverter provided according to the single-phase grid system can only output one of the voltage levels of 120V or 240V, and cannot simultaneously output two voltage levels, that is, a plurality of household appliances with different voltage levels cannot be simultaneously supplied with power.
At present, a common mode is to connect a power frequency isolation transformer or an autotransformer to an off-grid output port of an inverter for phase splitting, in this mode, the inverter only outputs 240V of one voltage grade in an off-grid operation mode, and the power frequency isolation transformer or the autotransformer performs phase splitting on the output voltage, so that two voltages of 120V and 240V can be obtained. However, in this common method, because a power frequency isolation transformer or an autotransformer is used, the size of the inverter itself is increased, the overall weight of the device is heavy, and the energy consumption of the additional transformer itself causes the overall efficiency of the system to be correspondingly reduced.
Another mode that realizes the phase splitting at present is to adopt the mode of connecting the electron phase splitter in order to replace power frequency isolation transformer or autotransformer, however, it is by the switch tube to connect the electron phase splitter, the loop that energy storage equipment such as inductance and electric capacity constitutes, for playing the phase splitting effect, it can be seen as having increased one-level power conversion return circuit on former system, owing to increased more components and parts again, extra energy loss has also been produced at the transform in-process naturally, and further increased equipment cost, make the system configuration process more loaded down with trivial details.
SUMMERY OF THE UTILITY MODEL
In order to overcome the deficiencies of the prior art, the utility model aims to provide a two-way transform structure suitable for split phase electric wire netting, the dc-to-ac converter of application this structure can be applicable to single-phase electric wire netting and split phase electric wire netting simultaneously to output current and phase difference that can control each looks when it is connected with the split phase electric wire netting.
The utility model provides a two-way transform structure suitable for phase splitting electric wire netting, including direct current bus filter circuit, direct current side switch circuit, clamp circuit, inverter circuit, auxiliary switch spare, first output power line, second output power line, third output power line, direct current bus filter circuit with direct current side switch circuit clamp circuit connects, clamp circuit with direct current side switch circuit inverter circuit connects, auxiliary switch spare is in direct current bus filter circuit with the clamp circuit junction, inverter circuit passes through first output power line is connected with first live wire, inverter circuit passes through second output power line is connected with the second live wire, auxiliary switch spare passes through third output power line is connected with the zero line.
Further, the dc bus filter circuit includes a first filter capacitor and a second filter capacitor, the first filter capacitor and the second filter capacitor are connected in series, the first filter capacitor and the second filter capacitor are connected to the dc side switch circuit, and the clamp circuit is connected to a connection between the first filter capacitor and the second filter capacitor.
Further, the dc-side switch circuit includes a first switch tube and a second switch tube, the first switch tube is connected between the first filter capacitor and the clamp circuit, and the second switch tube is connected between the second filter capacitor and the clamp circuit.
Further, the clamping circuit comprises a first clamping diode and a second clamping diode, wherein the negative pole of the first clamping diode is connected with the first switch tube, the positive pole of the first clamping diode is connected with the negative pole of the second clamping diode, the positive pole of the second clamping diode is connected with the second switch tube, and the joint of the first clamping diode and the second clamping diode is connected with the joint of the first filter capacitor and the second filter capacitor.
Furthermore, the inverter circuit includes a first bridge arm circuit and a second bridge arm circuit, the first bridge arm circuit includes a third switch tube, a fourth switch tube and a first inductor, the second bridge arm circuit includes a fifth switch tube, a sixth switch tube and a second inductor, the third switch tube is connected in series with the fourth switch tube, the first inductor is connected between the third switch tube and the fourth switch tube, the fifth switch tube is connected in series with the sixth switch tube, and the second inductor is connected between the fifth switch tube and the sixth switch tube.
Further, the first switch tube and the second switch tube are MOS tubes, a drain of the first switch tube is connected to the first filter capacitor, a source of the first switch tube is connected to a cathode of the first clamping diode, a source of the second switch tube is connected to the second filter capacitor, and a drain of the second switch tube is connected to an anode of the second clamping diode.
Further, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube all adopt MOS tubes, the drain electrode of the third switch tube with the negative pole of the first clamping diode is connected, the source electrode of the third switch tube with the drain electrode of the fourth switch tube is connected, the source electrode of the fourth switch tube with the positive pole of the second clamping diode is connected, the drain electrode of the fifth switch tube with the drain electrode of the third switch tube is connected, the source electrode of the fifth switch tube with the drain electrode of the sixth switch tube is connected, the source electrode of the sixth switch tube with the source electrode of the fourth switch tube is connected.
Compared with the prior art, the beneficial effects of the utility model reside in that:
1. three output power wires are configured, in the transformation structure, the output power wires are connected with a zero line of a split-phase power grid, and a current loop is provided for the zero line inside the transformation structure, so that the zero line of the split-phase power grid can be used for sampling by a sampling circuit, and current passes through the zero line at the same time, and the technical problems that when an inverter is connected with the split-phase power grid in the prior art, different currents cannot be output to two phases of the split-phase power grid when the inverter is connected with the split-phase power grid, and the voltage and the phase of a first live wire to the zero line and the voltage and the phase of a second live wire to the zero line cannot be controlled respectively when the inverter is disconnected from the grid are solved;
2. based on the reasons, the three output power lines are respectively connected with the first live wire, the second live wire and the zero line of the split-phase power grid, and the conversion structure provides a power loop for the zero line of the split-phase power grid, so that the inverter can output different powers for two phases of the split-phase power grid during grid connection, namely, each phase can be controlled to output, and independent reverse flow prevention for each phase can be realized;
3. when the inverter is in an off-grid running state, the voltage between a first live wire, a second live wire and a zero wire of the split-phase power grid is controlled to be 120V, the phase difference between the first live wire and the zero wire and the phase difference between the second live wire and the zero wire are controlled to be 180 degrees, and the voltage between the first live wire and the second live wire is 240V, so that two voltage levels of 120V and 240V are output simultaneously, and the technical problem that different levels of voltage cannot be output simultaneously when the inverter designed based on a single-phase power grid is connected with the split-phase power grid in the prior art is solved;
4. the method of realizing different levels of voltage output by additionally arranging a transformer phase splitter or externally connecting an electronic phase splitter under the prior art is replaced, so that the overall complexity of the system is reduced, the use of system components is reduced, and the workload of system configuration and installation and the system operation cost are obviously reduced;
5. based on the advantages, the inverter designed based on the single-phase power grid in the prior art can be suitable for the single-phase power grid and the split-phase power grid; and moreover, an auxiliary switching element is introduced, and the switching of the operation mode of the inverter conversion structure is completed by controlling the on and off of the switching element, so that the loss of system energy in the conversion process is reduced.
The above description is only an outline of the technical solution of the present invention, and in order to make the technical means of the present invention more clearly understood and to be implemented in accordance with the content of the specification, the following detailed description will be given of preferred embodiments of the present invention in conjunction with the accompanying drawings. The following examples and the accompanying drawings illustrate specific embodiments of the present invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:
fig. 1 is a circuit diagram of the bidirectional conversion structure suitable for the split-phase power grid of the present invention;
fig. 2 is a schematic diagram of the connection between the bidirectional conversion structure and the single-phase power grid suitable for the split-phase power grid of the present invention;
fig. 3 is the utility model discloses a two-way transform structure and phase splitting electric wire netting connection schematic diagram suitable for phase splitting electric wire netting:
fig. 4 is a schematic diagram of driving signals of the first to sixth switching tubes in the bidirectional conversion structure suitable for the split-phase power grid shown in fig. 3:
fig. 5 is a schematic diagram of an equivalent circuit structure of the bidirectional transformation structure suitable for the split-phase power grid shown in fig. 3, when the voltage of the split-phase power grid is in a positive half cycle during grid connection or when the voltage of the output L1-L2 is in a positive half cycle during off-grid, the control unit controls the bidirectional transformation structure to be in a state 1;
fig. 6 is a schematic structural diagram of an equivalent circuit of the bidirectional transformation structure suitable for the split-phase power grid shown in fig. 3, when the voltage of the split-phase power grid is in a positive half cycle during grid connection or when the voltage of the output L1-L2 is in a positive half cycle during off-grid, the control unit controls the bidirectional transformation structure to be in a state 2;
fig. 7 is a schematic diagram of an equivalent circuit structure of the bidirectional transformation structure suitable for the split-phase power grid shown in fig. 3, when the voltage of the split-phase power grid is in a positive half cycle during grid connection or when the voltage of the output L1-L2 is in a positive half cycle during off-grid, the control unit controls the bidirectional transformation structure to be in a state 3;
fig. 8 is a schematic diagram of an equivalent circuit structure of the bidirectional conversion structure suitable for the split-phase power grid shown in fig. 3, when the voltage of the split-phase power grid is in a positive half cycle during grid connection or the voltage of the output L1-L2 is in a positive half cycle during grid disconnection, and the control unit controls the bidirectional conversion structure to be in a state 4;
fig. 9 is a schematic structural diagram of an equivalent circuit of the bidirectional transformation structure suitable for the split-phase power grid shown in fig. 3, when the voltage of the split-phase power grid is in a negative half cycle during grid connection or when the voltage of the output L1-L2 is in a negative half cycle during off-grid, the control unit controls the bidirectional transformation structure to be in a state 5;
fig. 10 is a schematic diagram of an equivalent circuit structure of the bidirectional transformation structure suitable for the split-phase power grid shown in fig. 3, when the voltage of the split-phase power grid is in a negative half cycle during grid connection or when the voltage of the output L1-L2 is in a negative half cycle during off-grid, the control unit controls the bidirectional transformation structure to be in a state 6;
fig. 11 is a schematic structural diagram of an equivalent circuit of the bidirectional transformation structure suitable for the split-phase power grid shown in fig. 3, when the voltage of the split-phase power grid is in a negative half cycle when the grid is connected or the output voltage L1-L2 is in a negative half cycle when the grid is disconnected, the control unit controls the bidirectional transformation structure to be in a state 7;
fig. 12 is a schematic diagram of an equivalent circuit structure of the bidirectional conversion structure suitable for the split-phase power grid shown in fig. 3, when the voltage of the split-phase power grid is in a negative half cycle during grid connection or the voltage of the output L1-L2 is in a negative half cycle during grid disconnection, and the control unit controls the bidirectional conversion structure to be in a state 8.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.
A bidirectional conversion structure suitable for a split-phase power grid is disclosed, as shown in figures 1-3, and comprises a direct current bus filter circuit, a direct current side switch circuit, a clamping circuit, an inverter circuit, an auxiliary switch element, a first output power line, a second output power line and a third output power line, wherein the direct current bus filter circuit is connected with the direct current side switch circuit and the clamping circuit, the clamping circuit is connected with the direct current side switch circuit and the inverter circuit, the auxiliary switch element is connected at the joint of the direct current bus filter circuit and the clamping circuit, the inverter circuit is connected with a first live wire L1 through a first output power line 10, the inverter circuit is connected with a second live wire L2 through a second output power line 20, and the auxiliary switch element is connected with a zero line N through a third output power line 30. The auxiliary switch component is used for switching the structure under a single-phase power grid operation mode and a split-phase power grid operation mode. When the transformation structure works, the control unit controls the on-off of the auxiliary switch piece, so that the transformation structure is in a single-phase power grid operation mode or a split-phase power grid operation mode.
As shown in fig. 1-3, the dc bus filter circuit includes a first filter capacitor C1 and a second filter capacitor C2, the first filter capacitor and the second filter capacitor are connected in series, the first filter capacitor and the second filter capacitor are connected to the dc side switch circuit, and the clamp circuit is connected to a connection between the first filter capacitor and the second filter capacitor. The theoretical voltage value of the first filter capacitor C1 and the second filter capacitor C2 is one half of the dc bus voltage, and for convenience of description, in this embodiment, the voltages of the first filter capacitor C1 and the second filter capacitor C2 are both positive and negative.
The direct current side switch circuit comprises a first switch tube S1 and a second switch tube S2, wherein the first switch tube is connected between the first filter capacitor and the clamping circuit, and the second switch tube is connected between the second filter capacitor and the clamping circuit.
The clamping circuit comprises a first clamping diode D1 and a second clamping diode D2, wherein the cathode of the first clamping diode is connected with a first switch tube, the anode of the first clamping diode is connected with the cathode of the second clamping diode, the anode of the second clamping diode is connected with a second switch tube, and the joint of the first clamping diode and the second clamping diode is connected with the joint of a first filter capacitor and a second filter capacitor.
The inverter circuit comprises a first bridge arm circuit and a second bridge arm circuit, the first bridge arm circuit comprises a third switching tube S3, a fourth switching tube S4 and a first inductor La, the second bridge arm circuit comprises a fifth switching tube S5, a sixth switching tube S6 and a second inductor Lb, the third switching tube and the fourth switching tube are connected in series, the first inductor is connected between the third switching tube and the fourth switching tube, the fifth switching tube and the sixth switching tube are connected in series, and the second inductor is connected between the fifth switching tube and the sixth switching tube. When the transformation structure is in a split-phase power grid operation mode, the transformation structure controls the output current and the phase difference of each phase of the transformation structure when the transformation structure is connected to the grid and controls the voltage and the phase difference of the output power line when the transformation structure is disconnected from the grid by controlling the on and off of the switching tube.
In an embodiment, the first switch tube and the second switch tube are MOS tubes, a drain of the first switch tube is connected to the first filter capacitor, a source of the first switch tube is connected to a cathode of the first clamping diode, a source of the second switch tube is connected to the second filter capacitor, and a drain of the second switch tube is connected to an anode of the second clamping diode.
In an embodiment, the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube are all MOS tubes, a drain of the third switching tube is connected with a cathode of the first clamping diode, a source of the third switching tube is connected with a drain of the fourth switching tube, a source of the fourth switching tube is connected with an anode of the second clamping diode, a drain of the fifth switching tube is connected with a drain of the third switching tube, a source of the fifth switching tube is connected with a drain of the sixth switching tube, and a source of the sixth switching tube is connected with a source of the fourth switching tube.
As shown in fig. 4, according to the bidirectional conversion structure of the present split-phase power grid, to satisfy different output currents of each phase, the switching sequence of 6 switching tubes is configured, and there are 8 operating states in total.
As shown in fig. 5, in state 1, the driving signal of the PWM controller is G1 high, G2 high, G3 high, G4 low, G5 low, and G6 high, and corresponding to the corresponding switch tube, the first switch tube S1 is turned on, the second switch tube S2 is turned on, the third switch tube S3 is turned on, the fourth switch tube S4 is turned off, the fifth switch tube S5 is turned off, and the sixth switch tube S6 is turned on. As shown in fig. 5, a solid arrow in the figure shows the flowing direction of the energy flowing through the first inductor La, and an open arrow shows the flowing direction of the energy flowing through the second inductor Lb, when the transforming architecture is in this state, the energy of the first bridge arm flows from the positive electrode of the first filter capacitor C1, through S1 → La → L1 → N → T, and returns to the negative electrode of the first filter capacitor C1; meanwhile, the energy of the second arm flows from the positive electrode of the filter capacitor C2, through T → N → L2 → Lb → S6 and returns to the negative electrode of the filter capacitor C2.
As shown in fig. 6, in state 2, the driving signal of the PWM controller is G1 high, G2 low, G3 high, G4 low, G5 low, and G6 high, and corresponding to the corresponding switch tube, the first switch tube S1 is turned on, the second switch tube S2 is turned off, the third switch tube S3 is turned on, the fourth switch tube S4 is turned off, the fifth switch tube S5 is turned off, and the sixth switch tube S6 is turned on. As shown in fig. 6, the solid arrows in the figure show the flowing direction of the energy flowing through the first inductor La, the hollow arrows show the flowing direction of the energy flowing through the second inductor Lb, and when the transforming architecture is in this state, the energy of the first bridge arm flows from the positive electrode of the first filter capacitor C1, through S1 → La → L1 → N → T, and returns to the negative electrode of the first filter capacitor C1; meanwhile, the energy of the second bridge arm flows from the left end of the second filter inductance Lb, through S6 → D2 → T → N → L2, and returns to the right end of the second filter inductance Lb.
As shown in fig. 7, in state 3, the driving signal of the PWM controller is G1 low, G2 high, G3 high, G4 low, G5 low, and G6 high, and corresponding to the corresponding switch tube, the first switch tube S1 is turned off, the second switch tube S2 is turned on, the third switch tube S3 is turned on, the fourth switch tube S4 is turned off, the fifth switch tube S5 is turned off, and the sixth switch tube S6 is turned on. As shown in fig. 7, the solid arrows in the figure show the flowing direction of the energy flowing through the first inductor La, the hollow arrows show the flowing direction of the energy flowing through the second inductor Lb, and when the shift structure is in this state, the energy of the first bridge arm flows from the right end of the first filter inductor La, and flows through L1 → N → T → D1 → S3 to return to the left end of the first filter inductor La; meanwhile, the energy of the second arm flows from the positive pole of the second filter capacitor C2, through T → N → L2 → Lb → S6, and returns to the negative pole of the second filter capacitor.
As shown in fig. 8, in state 4, the driving signal of the PWM controller is G1 low, G2 low, G3 high, G4 low, G5 low, and G6 high, and corresponding to the corresponding switch tube, the first switch tube S1 is turned off, the second switch tube S2 is turned off, the third switch tube S3 is turned on, the fourth switch tube S4 is turned off, the fifth switch tube S5 is turned off, and the sixth switch tube S6 is turned on. As shown in fig. 8, the solid arrows in the figure show the flowing direction of the energy flowing through the first inductor La, the hollow arrows show the flowing direction of the energy flowing through the second inductor Lb, and when the transforming architecture is in this state, the energy of the first bridge arm flows from the right end of the first filter inductor La, flows through L1 → N → T → D1 → S3 and returns to the left end of the first filter inductor La; meanwhile, the energy of the second leg flows through S6 → D2 → T → N → L2 from the left end of the second filter inductance Lb.
As shown in fig. 9, in state 5, the driving signal of the PWM controller is G1 high, G2 high, G3 low, G4 high, G5 high, and G6 low, and corresponding to the corresponding switch tube, the first switch tube S1 is turned on, the second switch tube S2 is turned on, the third switch tube S3 is turned off, the fourth switch tube S4 is turned on, the fifth switch tube S5 is turned on, and the sixth switch tube S6 is turned off. As shown in fig. 9, the solid arrows in the figure show the flowing direction of the energy flowing through the first inductor La, the hollow arrows show the flowing direction of the energy flowing through the second inductor Lb, and when the conversion architecture is in this state, the energy of the first bridge arm flows from the positive electrode of the second filter capacitor C2, through T → N → L1 → La → S4 and returns to the negative electrode of the second filter capacitor C2; meanwhile, the energy of the second leg flows from the positive electrode of the first filter capacitor C1, through S1 → S5 → Lb → L2 → N → T, and returns to the negative electrode of the first filter capacitor C1.
As shown in fig. 10, in state 6, the driving signal of the PWM controller is G1 low, G2 high, G3 low, G4 high, G5 high, and G6 low, and corresponding to the corresponding switch tube, the first switch tube S1 is turned off, the second switch tube S2 is turned on, the third switch tube S3 is turned off, the fourth switch tube S4 is turned on, the fifth switch tube S5 is turned on, and the sixth switch tube S6 is turned off. As shown in fig. 10, the solid arrows in the figure show the flowing direction of the energy flowing through the first inductor La, the hollow arrows show the flowing direction of the energy flowing through the second inductor Lb, and when the conversion architecture is in this state, the energy of the first bridge arm flows from the positive pole of the filter inductor C2, flows through T → N → L1 → La → S4, and returns to the negative pole of the second filter capacitor C2; meanwhile, the energy of the second leg flows from the right end of the second filter inductance Lb, through L2 → N → T → D1 → S5, and returns to the left end of the second filter inductance Lb.
As shown in fig. 11, in state 7, the driving signal of the PWM controller is G1 high, G2 low, G3 low, G4 high, G5 high, and G6 low, and corresponding to the corresponding switch tube, the first switch tube S1 is turned on, the second switch tube S2 is turned off, the third switch tube S3 is turned off, the fourth switch tube S4 is turned on, the fifth switch tube S5 is turned on, and the sixth switch tube S6 is turned off. As shown in fig. 11, the solid arrows in the figure show the flowing direction of the energy flowing through the first inductor La, the hollow arrows show the flowing direction of the energy flowing through the second inductor Lb, and when the shift structure is in this state, the energy of the first bridge arm flows from the left end of the first filter inductor La to the right end of the first filter inductor La through S4 → D2 → T → N → L1; meanwhile, the energy of the second arm flows from the positive electrode of the first smoothing capacitor C1, through S1 → S5 → Lb → L2 → N → T, and returns to the negative electrode of the first smoothing capacitor C1.
As shown in fig. 12, in state 8, the driving signal of the PWM controller is G1 low, G2 low, G3 low, G4 high, G5 high, and G6 low, and corresponding to the corresponding switch tube, the first switch tube S1 is turned off, the second switch tube S2 is turned off, the third switch tube S3 is turned off, the fourth switch tube S4 is turned on, the fifth switch tube S5 is turned on, and the sixth switch tube S6 is turned off. The solid arrows in fig. 12 show the flowing direction of the energy flowing through the first inductor La, the hollow arrows show the flowing direction of the energy flowing through the second inductor Lb, and when the conversion structure is in this state, the energy of the first bridge arm flows from the left end of the first filter inductor La, through S4 → D2 → T → N → L1 and returns to the right end of the first filter inductor La; meanwhile, the energy of the second leg flows from the right end of the second filter inductance Lb, through L2 → N → T → D1 → S5, and returns to the left end of the second filter inductance Lb.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way; the utility model can be smoothly implemented by the ordinary technicians in the industry according to the drawings and the above description; however, those skilled in the art should understand that changes, modifications and variations made by the above-described technology can be made without departing from the scope of the present invention, and all such changes, modifications and variations are equivalent embodiments of the present invention; meanwhile, any changes, modifications, evolutions, etc. of equivalent changes made to the above embodiments according to the essential technology of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (7)
1. The utility model provides a two-way transform structure suitable for split-phase electric wire netting which characterized in that: including direct current bus filter circuit, direct current side switch circuit, clamp circuit, inverter circuit, auxiliary switch spare, first output power line, second output power line, third output power line, direct current bus filter circuit with direct current side switch circuit clamp circuit connects, clamp circuit with direct current side switch circuit inverter circuit connects, auxiliary switch spare connects direct current bus filter circuit with the clamp circuit junction, inverter circuit passes through first output power line is connected with first live wire, inverter circuit passes through second output power line is connected with the second live wire, auxiliary switch spare passes through third output power line is connected with the zero line.
2. A bidirectional transformation structure suitable for an isolated phase power grid according to claim 1, wherein: the direct-current bus filter circuit comprises a first filter capacitor and a second filter capacitor, the first filter capacitor and the second filter capacitor are connected in series, the first filter capacitor and the second filter capacitor are connected with the direct-current side switch circuit, and the clamping circuit is connected to the joint of the first filter capacitor and the second filter capacitor.
3. A bidirectional transformation structure suitable for an isolated phase power grid according to claim 2, wherein: the direct-current side switching circuit comprises a first switching tube and a second switching tube, wherein the first switching tube is connected between the first filter capacitor and the clamping circuit, and the second switching tube is connected between the second filter capacitor and the clamping circuit.
4. A bidirectional transformation structure suitable for a split-phase power grid according to claim 3, wherein: the clamping circuit comprises a first clamping diode and a second clamping diode, the negative pole of the first clamping diode is connected with the first switch tube, the positive pole of the first clamping diode is connected with the negative pole of the second clamping diode, the positive pole of the second clamping diode is connected with the second switch tube, and the joint of the first clamping diode and the second clamping diode is connected with the joint of the first filter capacitor and the second filter capacitor.
5. A bidirectional transformation structure suitable for a split-phase power grid according to claim 4, wherein: the inverter circuit comprises a first bridge arm circuit and a second bridge arm circuit, the first bridge arm circuit comprises a third switching tube, a fourth switching tube and a first inductor, the second bridge arm circuit comprises a fifth switching tube, a sixth switching tube and a second inductor, the third switching tube is connected with the fourth switching tube in series, the first inductor is connected between the third switching tube and the fourth switching tube, the fifth switching tube is connected with the sixth switching tube in series, and the second inductor is connected between the fifth switching tube and the sixth switching tube.
6. A bidirectional transformation structure suitable for a split-phase power grid according to claim 4, wherein: the first switch tube and the second switch tube adopt MOS tubes, the drain electrode of the first switch tube is connected with the first filter capacitor, the source electrode of the first switch tube is connected with the cathode of the first clamping diode, the source electrode of the second switch tube is connected with the second filter capacitor, and the drain electrode of the second switch tube is connected with the anode of the second clamping diode.
7. A bidirectional transformation structure suitable for an isolated phase power grid according to claim 5, wherein: the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube are all MOS tubes, the drain electrode of the third switching tube is connected with the negative electrode of the first clamping diode, the source electrode of the third switching tube is connected with the drain electrode of the fourth switching tube, the source electrode of the fourth switching tube is connected with the positive electrode of the second clamping diode, the drain electrode of the fifth switching tube is connected with the drain electrode of the third switching tube, the source electrode of the fifth switching tube is connected with the drain electrode of the sixth switching tube, and the source electrode of the sixth switching tube is connected with the source electrode of the fourth switching tube.
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| WO2024187974A1 (en) * | 2023-03-14 | 2024-09-19 | 杭州禾迈电力电子股份有限公司 | Dc/ac circuit and inverter device |
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