CN213547385U - Single-phase AC/DC converter - Google Patents
Single-phase AC/DC converter Download PDFInfo
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- CN213547385U CN213547385U CN202021584572.6U CN202021584572U CN213547385U CN 213547385 U CN213547385 U CN 213547385U CN 202021584572 U CN202021584572 U CN 202021584572U CN 213547385 U CN213547385 U CN 213547385U
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Abstract
The utility model discloses a single crossing DC conversion device, include: the device comprises a filter circuit, an AC/DC circuit, a DC/DC circuit, an LLC circuit, a full-wave rectification circuit, a first controller and a second controller; the filter circuit is respectively connected with a single-phase alternating current power grid and the AC/DC circuit; the output end of the AC/DC circuit is connected with the input end of the DC/DC circuit; the output end of the DC/DC circuit is connected with the input end of the LLC circuit; the output end of the LLC circuit is connected with the input end of the full-wave rectification circuit; the output end of the full-wave rectifying circuit is connected with a load; the first controller is connected with the second controller, and the first controller is connected with the control end of the AC/DC circuit and is used for controlling the AC/DC circuit to carry out rectification or inversion; the second controller is connected with the DC/DC circuit, the LLC circuit and the full-wave rectification circuit and is used for controlling the three circuits to carry out voltage boosting or voltage reduction. The single-phase direct current conversion device can realize bidirectional work of rectification and inversion grid connection, and improves the power utilization rate and efficiency.
Description
Technical Field
The utility model relates to a current transformation technical field especially relates to a single-phase crossing DC conversion device.
Background
The alternating current-direct current conversion is widely applied to links such as inverters of energy storage systems, hybrid power supply grid-off and grid-connected inverters, lithium battery factory formation capacity grading, aging detection and the like. However, the current ac/dc conversion device has the problems of low power utilization rate, low efficiency and the like.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that exists among the prior art, the utility model provides a single-phase direct current conversion device aims at improving single-phase alternating current direct current conversion device's power utilization and efficiency.
The embodiment of the utility model provides a single crossing DC conversion device, include: the device comprises a filter circuit, an AC/DC circuit, a DC/DC circuit, an LLC circuit, a full-wave rectification circuit, a first controller and a second controller;
the input end of the filter circuit is connected to a single-phase alternating current power grid, the first output end of the filter circuit is connected with the first input end of the AC/DC circuit, and the second output end of the filter circuit is connected with the second input end of the AC/DC circuit;
the output end of the AC/DC circuit is connected with the input end of the DC/DC circuit;
the output end of the DC/DC circuit is connected with the input end of the LLC circuit;
the output end of the LLC circuit is connected with the input end of the full-wave rectification circuit;
the output end of the full-wave rectifying circuit is connected with a load;
the first controller is connected with the second controller, and the first controller is connected with the control end of the AC/DC circuit and is used for controlling the AC/DC circuit to carry out rectification or inversion;
the second controller is connected with the DC/DC circuit, the LLC circuit and the full-wave rectification circuit and is used for controlling the DC/DC circuit, the LLC circuit and the full-wave rectification circuit to perform voltage boosting or voltage reduction.
In some embodiments, the full-wave rectification circuit includes a first transformer, a second transformer, a third transformer, and a rectification circuit.
In some embodiments, the first controller and the second controller each comprise a digital signal processor, DSP.
In some embodiments, the LLC circuit is a three-phase LLC circuit, wherein the three-phase LLC is phase-staggered by 120 °.
In some embodiments, the filter circuit comprises: the inductor comprises a first capacitor, a first inductor, a second capacitor, a second inductor and a third inductor;
the first end of the first capacitor is connected with the first pin of the first inductor in a common mode and is connected with the live wire of the single-phase alternating current power grid, the second end of the first capacitor is connected with the third pin of the first inductor in a common mode and is connected with the zero wire of the single-phase alternating current power grid, the second pin of the first inductor, the first end of the second capacitor and the first end of the second inductor are connected in a common mode, the fourth pin of the first inductor, the second end of the second capacitor and the first end of the third inductor are connected in a common mode, the second end of the second inductor serves as the first output end of the filter circuit and is connected with the first input end of the AC/DC circuit, and the second end of the third inductor serves as the second output end of the filter circuit and is connected with the second input end of the AC/DC circuit.
In some embodiments, the AC/DC circuit comprises: the electrolytic capacitor comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube and an electrolytic capacitor;
the emitter of the first switch tube and the collector of the third switch tube are connected in common, the first input end of the AC/DC circuit is connected with the first output end of the filter circuit, the emitter of the second switch tube and the collector of the fourth switch tube are connected in common, the second input end of the AC/DC circuit is connected with the second output end of the filter circuit, the collector of the first switch tube, the collector of the second switch tube and the first end of the electrolytic capacitor are connected in common, and the emitter of the third switch tube, the emitter of the fourth switch tube and the second end of the electrolytic capacitor are connected in common.
In some embodiments, the DC/DC circuit comprises: a third capacitor, a fifth switch tube, a sixth switch tube, a fourth inductor and a fourth capacitor;
the first end of the third capacitor is connected with the drain electrode of the fifth switch tube, the second end of the third capacitor, the source electrode of the sixth switch tube and the second end of the fourth capacitor are connected in common, the source electrode of the fifth switch tube, the first end of the fourth inductor and the drain electrode of the sixth switch tube are connected in common, and the second end of the fourth inductor is connected with the first end of the fourth capacitor.
In some embodiments, the LLC circuit includes: a fifth capacitor, a seventh switch tube, an eighth switch tube, a ninth switch tube, a tenth switch tube, an eleventh switch tube, a twelfth switch tube, a sixth capacitor, a seventh capacitor, an eighth capacitor, a fifth inductor, a sixth inductor and a seventh inductor;
the first end of the fifth capacitor, the drain electrode of the seventh switch tube, the drain electrode of the eighth switch tube and the drain electrode of the ninth switch tube are connected in common, the second end of the fifth capacitor, the source electrode of the tenth switching tube, the source electrode of the eleventh switching tube and the source electrode of the twelfth switching tube are connected in common, the source electrode of the seventh switch tube, the drain electrode of the tenth switch tube and the first end of the eighth capacitor are connected in common, a second end of the eighth capacitor is connected with a first end of the seventh inductor, a source of the eighth switch tube, a drain of the eleventh switch tube and a first end of the seventh capacitor are connected in common, the second end of the seventh capacitor is connected with the first end of the sixth inductor, the source electrode of the ninth switching tube, the drain electrode of the twelfth switching tube and the first end of the sixth capacitor are connected in common, and the second end of the sixth capacitor is connected with the first end of the fifth inductor. In some embodiments, the full wave rectification circuit comprises: the transformer comprises a first transformer primary side, a first transformer secondary side first winding, a first transformer secondary side second winding, a second transformer primary side, a second transformer secondary side first winding, a second transformer secondary side second winding, a third transformer primary side, a third transformer secondary side first winding, a third transformer secondary side second winding, a thirteenth switching tube, a fourteenth switching tube, a fifteenth switching tube, a sixteenth switching tube, a seventeenth switching tube, an eighteenth switching tube and a ninth capacitor;
the first end of the primary side of the first transformer is connected with the second end of the fifth inductor, the first end of the primary side of the second transformer is connected with the second end of the sixth inductor, the first end of the primary side of the third transformer is connected with the second end of the seventh inductor, and the second end of the primary side of the first transformer, the second end of the primary side of the second transformer and the second end of the primary side of the third transformer are connected together;
the first end of the first secondary winding of the first transformer is connected with the drain electrode of the thirteenth switching tube, the first end of the first secondary winding of the second transformer is connected with the drain electrode of the fourteenth switching tube, the first end of the first secondary winding of the third transformer is connected with the drain electrode of the fifteenth switching tube, and the source electrode of the thirteenth switching tube, the source electrode of the fourteenth switching tube and the source electrode of the fifteenth switching tube are connected in common;
the second end of the first transformer secondary side first winding, the second end of the second transformer secondary side first winding, the second end of the third transformer secondary side first winding, the first end of the ninth capacitor and the first end of the first transformer secondary side second winding are connected in common;
the second end of the secondary side second winding of the first transformer is connected with the drain electrode of the sixteenth capacitor, the second end of the secondary side second winding of the second transformer is connected with the drain electrode of the seventeenth capacitor, the second end of the secondary side second winding of the third transformer is connected with the drain electrode of the eighteenth capacitor, and the source electrode of the sixteenth capacitor, the source electrode of the seventeenth capacitor, the source electrode of the eighteenth capacitor and the second end of the ninth capacitor are connected in common.
In some embodiments, hardware fault signal communication is provided between the first controller and the second controller.
The embodiment of the utility model provides a pair of single-phase crossing DC conversion device, include: the device comprises a filter circuit, an AC/DC circuit, a DC/DC circuit, an LLC circuit, a full-wave rectification circuit, a first controller and a second controller; the input end of the filter circuit is connected to a single-phase alternating current power grid, the first output end of the filter circuit is connected with the first input end of the AC/DC circuit, and the second output end of the filter circuit is connected with the second input end of the AC/DC circuit; the output end of the AC/DC circuit is connected with the input end of the DC/DC circuit; the output end of the DC/DC circuit is connected with the input end of the LLC circuit; the output end of the LLC circuit is connected with the input end of the full-wave rectification circuit; the output end of the full-wave rectifying circuit is connected with a load; the first controller is connected with the second controller, and the first controller is connected with the control end of the AC/DC circuit and is used for controlling the AC/DC circuit to carry out rectification or inversion; the second controller is connected with the DC/DC circuit, the LLC circuit and the full-wave rectification circuit and is used for controlling the DC/DC circuit, the LLC circuit and the full-wave rectification circuit to perform voltage boosting or voltage reduction. The single-phase AC-DC conversion device can realize bidirectional work of rectification and inversion grid connection, and improve the power utilization rate and efficiency of the single-phase AC-DC conversion device.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention, but do not constitute a limitation of the embodiments of the invention. In the drawings:
fig. 1 is a schematic structural diagram of a single-phase ac/dc converter according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a filter circuit of a single-phase ac/dc converter according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an AC/DC circuit of a single-phase AC/DC converter according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a DC/DC circuit of a single-phase ac/DC converter according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an LLC circuit of a single-phase ac/dc converter according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a full-wave rectification circuit of a single-phase ac/dc converter according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a schematic structural diagram of a single-phase ac-dc converter according to an embodiment of the present invention, as shown in fig. 1, the single-phase ac-dc converter includes: the device comprises a filter circuit, an AC/DC circuit, a DC/DC circuit, an LLC circuit, a full-wave rectification circuit, a first controller and a second controller; the input end of the filter circuit is connected to a single-phase alternating current power grid, the first output end of the filter circuit is connected with the first input end of the AC/DC circuit, and the second output end of the filter circuit is connected with the second input end of the AC/DC circuit; the output end of the AC/DC circuit is connected with the input end of the DC/DC circuit; the output end of the DC/DC circuit is connected with the input end of the LLC circuit; the output end of the LLC circuit is connected with the input end of the full-wave rectification circuit; the output end of the full-wave rectifying circuit is connected with a load; the first controller is connected with the second controller, and the first controller is connected with the control end of the AC/DC circuit and is used for controlling the AC/DC circuit to carry out rectification or inversion; the second controller is connected with the DC/DC circuit, the LLC circuit and the full-wave rectification circuit and is used for controlling the DC/DC circuit, the LLC circuit and the full-wave rectification circuit to perform voltage boosting or voltage reduction.
Specifically, the filter circuit is used for filtering out ripples in the power grid. The AC/DC circuit is used for converting alternating current into direct current or converting direct current into alternating current, and particularly converting the alternating current into the direct current in a charging mode; in the discharge mode, the direct current is converted into alternating current. The DC/DC circuit, the LLC circuit and the full-wave rectification circuit are used for achieving the purpose of boosting or reducing voltage of the circuit, and specifically, the voltage reduction function is achieved in a charging mode; and under the discharge mode, a boosting function is realized.
The load comprises an energy storage battery, a battery detection device, a battery formation device, a battery capacity grading device and the like.
The first controller applies first driving waves to the AC/DC circuit, and achieves the purpose of outputting direct current with a specific voltage value or outputting single-phase alternating current by controlling the connection or disconnection of each switching tube in the AC/DC circuit.
The second controller applies driving waves to the DC/DC circuit, the LLC circuit and the full-wave rectification circuit, and achieves the purpose of outputting direct current with a specific voltage value by controlling the connection or disconnection of each switching tube in the DC/DC circuit, the LLC circuit and the full-wave rectification circuit.
The embodiment of the utility model provides a pair of single-phase direct current conversion device can realize rectification and contravariant and are incorporated into the power networks two-way work, improves single-phase alternating current direct current conversion device's power utilization and efficiency, and within 5% of input current total harmonic distortion, power factor 0.99, the full load efficiency of charge-discharge all reaches more than 90%, reaches more than 93% at the utmost. In some embodiments, the full-wave rectification circuit includes a first transformer, a second transformer, a third transformer, and a rectification circuit.
In some embodiments, the first controller and the second controller each comprise a digital signal processor, DSP.
In some embodiments, the LLC circuit is a three-phase LLC circuit, wherein the three-phase LLC is phase-staggered by 120 °.
Fig. 2 is a schematic diagram of a filter circuit of a single-phase ac/dc converter according to an embodiment of the present invention, as shown in fig. 2, in some embodiments, the filter circuit includes: a first capacitor C1, a first inductor L1, a second capacitor C2, a second inductor L2 and a third inductor L3; the first end of the first capacitor C1 is connected with the first pin of the first inductor L1 in a common mode and is connected with the live wire of the single-phase alternating current power grid, the second end of the first capacitor C1 is connected with the third pin of the first inductor L1 in a common mode, and is connected with the zero line of the single-phase alternating current network, the second pin of the first inductor L1, the first end of the second capacitor C2 and the first end of the second inductor L2 are connected together, the fourth pin of the first inductor L1, the second terminal of the second capacitor C2 and the first terminal of the third inductor L3 are connected in common, a second terminal of the second inductor L2 is connected as a first output terminal of the filter circuit to the first input terminal of the AC/DC circuit, a second terminal of the third inductor L3 is connected as the second output terminal of the filter circuit to the second input terminal of the AC/DC circuit.
Fig. 3 is a schematic diagram of an AC/DC circuit of a single-phase AC/DC conversion device according to an embodiment of the present invention, as shown in fig. 3, in some embodiments, the AC/DC circuit includes: a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4 and an electrolytic capacitor EC 1; an emitter of the first switching tube Q1 and a collector of the third switching tube Q3 are commonly connected and connected as the first input terminal of the AC/DC circuit to the first output terminal of the filter circuit, an emitter of the second switching tube Q2 and a collector of the fourth switching tube Q4 are commonly connected and connected as the second input terminal of the AC/DC circuit to the second output terminal of the filter circuit, a collector of the first switching tube Q1, a collector of the second switching tube Q2 and a first terminal of the electrolytic capacitor EC1 are commonly connected, and an emitter of the third switching tube Q3, an emitter of the fourth switching tube Q4 and a second terminal of the electrolytic capacitor EC1 are commonly connected.
Fig. 4 is a schematic diagram of a DC/DC circuit of a single-phase ac/DC conversion device according to an embodiment of the present invention, as shown in fig. 4, in some embodiments, the DC/DC circuit includes: a third capacitor C3, a fifth switch tube Q5, a sixth switch tube Q6, a fourth inductor L4, and a fourth capacitor C4; a first end of the third capacitor C3 is connected to a drain of the fifth switch tube Q5, a second end of the third capacitor C3, a source of the sixth switch tube Q6 and a second end of the fourth capacitor C4 are connected in common, a source of the fifth switch tube Q5, a first end of the fourth inductor L4 and a drain of the sixth switch tube Q6 are connected in common, and a second end of the fourth inductor L4 is connected to a first end of the fourth capacitor C4.
Fig. 5 is a schematic diagram of an LLC circuit of a single-phase ac/dc converter according to an embodiment of the present invention, as shown in fig. 5, in some embodiments, the LLC circuit includes: a fifth capacitor C5, a seventh switch tube Q7, an eighth switch tube Q8, a ninth switch tube Q9, a tenth switch tube Q10, an eleventh switch tube Q11, a twelfth switch tube Q12, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a fifth inductor L5, a sixth inductor L6 and a seventh inductor L7; a first end of the fifth capacitor C5, a drain of the seventh switch Q7, a drain of the eighth switch Q8 and a drain of the ninth switch Q9 are commonly connected, a second end of the fifth capacitor C5, a source of the tenth switch Q10, a source of the eleventh switch Q11 and a source of the twelfth switch Q12 are commonly connected, a source of the seventh switch Q7, a drain of the tenth switch Q10 and a first end of the eighth capacitor C8 are commonly connected, a second end of the eighth capacitor C8 is connected to a first end of the seventh inductor L7, a source of the eighth switch Q8, a drain of the eleventh switch Q11 and a first end of the seventh capacitor C7 are commonly connected, a second end of the seventh capacitor C7 is connected to a first end of the sixth inductor L6, a drain of the ninth switch Q9, a drain of the ninth switch Q12 and a drain of the ninth switch Q6 are commonly connected, a second terminal of the sixth capacitor C6 is connected to the first terminal of the fifth inductor L5. The embodiment of the utility model provides a LLC topology can realize that ZVS is soft to be opened, is favorable to reducing the loss. The three-phase LLC realizes low output ripple through 120 degrees of phase interleaving, and the utilization rate of devices is high.
Fig. 6 is a schematic diagram of a full-wave rectification circuit of a single-phase ac/dc conversion device according to an embodiment of the present invention, as shown in fig. 6, in some embodiments, the full-wave rectification circuit includes: a primary side of a first transformer T1, a primary side of a first transformer T1, a secondary side first winding of a first transformer T1, a secondary side second winding of a second transformer T2, a primary side of a second transformer T2, a secondary side first winding of a second transformer T2, a secondary side second winding of a second transformer T2, a primary side of a third transformer T3, a secondary side first winding of a third transformer T3, a secondary side second winding of a third transformer T3, a thirteenth switching tube Q13, a fourteenth switching tube Q14, a fifteenth switching tube Q15, a sixteenth switching tube Q16, a seventeenth switching tube Q17, an eighteenth switching tube Q18 and a ninth capacitor C9; a first end of a primary side of the first transformer T1 is connected to a second end of the fifth inductor L5, a first end of a primary side of the second transformer T2 is connected to a second end of the sixth inductor L6, a first end of a primary side of the third transformer T3 is connected to a second end of the seventh inductor L7, and a second end of a primary side of the first transformer T1, a second end of a primary side of the second transformer T2 and a second end of a primary side of the third transformer T3 are connected in common; a first end of a secondary side first winding of the first transformer T1 is connected to a drain of the thirteenth switching tube Q13, a first end of a secondary side first winding of the second transformer T2 is connected to a drain of the fourteenth switching tube Q14, a first end of a secondary side first winding of the third transformer T3 is connected to a drain of the fifteenth switching tube Q15, and a source of the thirteenth switching tube Q13, a source of the fourteenth switching tube Q14, and a source of the fifteenth switching tube Q15 are connected in common; a second end of the secondary side first winding of the first transformer T1, a second end of the secondary side first winding of the second transformer T2, a second end of the secondary side first winding of the third transformer T3, a first end of the ninth capacitor C9, a first end of the secondary side second winding of the first transformer T1, and a first end of the secondary side second winding of the second transformer T2 and a first end of the secondary side second winding of the third transformer T3 are connected in common; the second end of the secondary side second winding of the first transformer T1 is connected to the drain of the sixteenth switching tube Q16, the second end of the secondary side second winding of the second transformer T2 is connected to the drain of the seventeenth switching tube Q17, the second end of the secondary side second winding of the third transformer T3 is connected to the drain of the eighteenth switching tube Q18, and the source of the sixteenth switching tube Q16, the source of the seventeenth switching tube Q17, the source of the eighteenth switching tube Q18 and the second end of the ninth capacitor C9 are connected in common.
In some embodiments, hardware fault signal communication is provided between the first controller and the second controller.
Specifically, the first controller and the second controller are connected, specifically, information communication connection may be achieved through a CAN bus, a hardware fault signal is set between the first controller and the second controller, and when at least one circuit in the single-phase ac/dc converter fails, the first controller or the second controller sends a fault instruction to the other side to protect devices of each circuit from being damaged.
The embodiment of the utility model provides a pair of single-phase AC/DC conversion device can realize rectification and contravariant and be incorporated into the power networks bidirectional operation, improves single-phase AC/DC conversion device's power utilization and efficiency.
It will be understood by those skilled in the art that all or part of the steps of implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk, an optical disk, or the like.
The above describes in detail optional implementation manners of embodiments of the present invention with reference to the accompanying drawings, however, the embodiments of the present invention are not limited to the details in the above implementation manners, and in the technical concept scope of the embodiments of the present invention, it is possible to perform various simple modifications on the technical solutions of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not separately describe various possible combinations.
In addition, various different implementation manners of the embodiments of the present invention can be combined arbitrarily, and as long as it does not violate the idea of the embodiments of the present invention, it should be considered as the disclosure of the embodiments of the present invention.
Claims (10)
1. A single-phase dc converter, comprising: the device comprises a filter circuit, an AC/DC circuit, a DC/DC circuit, an LLC circuit, a full-wave rectification circuit, a first controller and a second controller;
the input end of the filter circuit is connected to a single-phase alternating current power grid, the first output end of the filter circuit is connected with the first input end of the AC/DC circuit, and the second output end of the filter circuit is connected with the second input end of the AC/DC circuit;
the output end of the AC/DC circuit is connected with the input end of the DC/DC circuit;
the output end of the DC/DC circuit is connected with the input end of the LLC circuit;
the output end of the LLC circuit is connected with the input end of the full-wave rectification circuit;
the output end of the full-wave rectifying circuit is connected with a load;
the first controller is connected with the second controller, and the first controller is connected with the control end of the AC/DC circuit and is used for controlling the AC/DC circuit to carry out rectification or inversion;
the second controller is connected with the DC/DC circuit, the LLC circuit and the full-wave rectification circuit and is used for controlling the DC/DC circuit, the LLC circuit and the full-wave rectification circuit to perform voltage boosting or voltage reduction.
2. The single-phase ac dc conversion device according to claim 1, wherein the full-wave rectification circuit includes a first transformer, a second transformer, a third transformer, and a rectification circuit.
3. The single-phase direct current conversion device according to claim 1, wherein the first controller and the second controller each include a Digital Signal Processor (DSP).
4. A single-phase dc conversion arrangement according to claim 1, wherein said LLC circuit is a three-phase LLC circuit, wherein the three-phase LLC circuits are phase-staggered by 120 °.
5. The single-phase dc conversion device according to claim 1, wherein the filter circuit comprises: the inductor comprises a first capacitor, a first inductor, a second capacitor, a second inductor and a third inductor;
the first end of the first capacitor is connected with the first pin of the first inductor in a common mode and is connected with the live wire of the single-phase alternating current power grid, the second end of the first capacitor is connected with the third pin of the first inductor in a common mode and is connected with the zero wire of the single-phase alternating current power grid, the second pin of the first inductor, the first end of the second capacitor and the first end of the second inductor are connected in a common mode, the fourth pin of the first inductor, the second end of the second capacitor and the first end of the third inductor are connected in a common mode, the second end of the second inductor serves as the first output end of the filter circuit and is connected with the first input end of the AC/DC circuit, and the second end of the third inductor serves as the second output end of the filter circuit and is connected with the second input end of the AC/DC circuit.
6. The single-phase direct current conversion device according to claim 1, wherein the AC/DC circuit includes: the electrolytic capacitor comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube and an electrolytic capacitor;
the emitter of the first switch tube and the collector of the third switch tube are connected in common, the first input end of the AC/DC circuit is connected with the first output end of the filter circuit, the emitter of the second switch tube and the collector of the fourth switch tube are connected in common, the second input end of the AC/DC circuit is connected with the second output end of the filter circuit, the collector of the first switch tube, the collector of the second switch tube and the first end of the electrolytic capacitor are connected in common, and the emitter of the third switch tube, the emitter of the fourth switch tube and the second end of the electrolytic capacitor are connected in common.
7. The single-phase direct current conversion device according to claim 1, wherein the DC/DC circuit includes: a third capacitor, a fifth switch tube, a sixth switch tube, a fourth inductor and a fourth capacitor;
the first end of the third capacitor is connected with the drain electrode of the fifth switch tube, the second end of the third capacitor, the source electrode of the sixth switch tube and the second end of the fourth capacitor are connected in common, the source electrode of the fifth switch tube, the first end of the fourth inductor and the drain electrode of the sixth switch tube are connected in common, and the second end of the fourth inductor is connected with the first end of the fourth capacitor.
8. The single-phase direct current conversion device according to claim 2, wherein the LLC circuit comprises: a fifth capacitor, a seventh switch tube, an eighth switch tube, a ninth switch tube, a tenth switch tube, an eleventh switch tube, a twelfth switch tube, a sixth capacitor, a seventh capacitor, an eighth capacitor, a fifth inductor, a sixth inductor and a seventh inductor;
the first end of the fifth capacitor, the drain electrode of the seventh switch tube, the drain electrode of the eighth switch tube and the drain electrode of the ninth switch tube are connected in common, the second end of the fifth capacitor, the source electrode of the tenth switching tube, the source electrode of the eleventh switching tube and the source electrode of the twelfth switching tube are connected in common, the source electrode of the seventh switch tube, the drain electrode of the tenth switch tube and the first end of the eighth capacitor are connected in common, a second end of the eighth capacitor is connected with a first end of the seventh inductor, a source of the eighth switch tube, a drain of the eleventh switch tube and a first end of the seventh capacitor are connected in common, the second end of the seventh capacitor is connected with the first end of the sixth inductor, the source electrode of the ninth switching tube, the drain electrode of the twelfth switching tube and the first end of the sixth capacitor are connected in common, and the second end of the sixth capacitor is connected with the first end of the fifth inductor.
9. The single-phase ac/dc converter according to claim 8, wherein the full-wave rectification circuit comprises: the transformer comprises a first transformer primary side, a first transformer secondary side first winding, a first transformer secondary side second winding, a second transformer primary side, a second transformer secondary side first winding, a second transformer secondary side second winding, a third transformer primary side, a third transformer secondary side first winding, a third transformer secondary side second winding, a thirteenth switching tube, a fourteenth switching tube, a fifteenth switching tube, a sixteenth switching tube, a seventeenth switching tube, an eighteenth switching tube and a ninth capacitor;
the first end of the primary side of the first transformer is connected with the second end of the fifth inductor, the first end of the primary side of the second transformer is connected with the second end of the sixth inductor, the first end of the primary side of the third transformer is connected with the second end of the seventh inductor, and the second end of the primary side of the first transformer, the second end of the primary side of the second transformer and the second end of the primary side of the third transformer are connected together;
the first end of the first secondary winding of the first transformer is connected with the drain electrode of the thirteenth switching tube, the first end of the first secondary winding of the second transformer is connected with the drain electrode of the fourteenth switching tube, the first end of the first secondary winding of the third transformer is connected with the drain electrode of the fifteenth switching tube, and the source electrode of the thirteenth switching tube, the source electrode of the fourteenth switching tube and the source electrode of the fifteenth switching tube are connected in common;
the second end of the first transformer secondary side first winding, the second end of the second transformer secondary side first winding, the second end of the third transformer secondary side first winding, the first end of the ninth capacitor and the first end of the first transformer secondary side second winding are connected in common;
the second end of the secondary second winding of the first transformer is connected with the drain electrode of a sixteenth capacitor, the second end of the secondary second winding of the second transformer is connected with the drain electrode of a seventeenth capacitor, the second end of the secondary second winding of the third transformer is connected with the drain electrode of an eighteenth capacitor, and the source electrode of the sixteenth capacitor, the source electrode of the seventeenth capacitor, the source electrode of the eighteenth capacitor and the second end of the ninth capacitor are connected in common.
10. The single-phase direct current conversion device according to claim 1, wherein hardware fault signal communication is provided between the first controller and the second controller.
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