Double-live-wire topology circuit and double-live-wire charging and discharging equipment

Abstract

The utility model relates to the technical field of power electronics, and discloses a double-live-wire topology circuit and double-live-wire charging and discharging equipment, a first filtering module in the circuit is used for accessing alternating-current double live wires, and a first conversion circuit comprises a first primary side bridge type module, a first voltage transformation module and a first secondary side bridge type module which are connected in sequence; the second conversion circuit comprises a second primary side bridge type module, a second transformation module and a second secondary side bridge type module which are connected in sequence; the first secondary side bridge type module and the second secondary side bridge type module are connected in parallel for output; the first primary side bridge type module and the second primary side bridge type module are connected in series; a series connection point where the first primary side bridge type module and the second primary side bridge type module are connected in series serves as a middle line point, and the series connection point is further connected to a middle point between the alternating-current double live wires; and the main control module is used for controlling the first conversion circuit and the second conversion circuit to alternately work according to a preset phase dislocation angle according to the working mode of the double-live-wire battery, so that reconstruction of neutral line points is reduced, and the circuit hardware cost is saved.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a dual-live-wire topology circuit and a dual-live-wire charging and discharging device. Background Art

[0002] In the prior art, for power supply products that require high-frequency isolation and high power, in order to achieve high power, multiple DC-DC converters are often used in parallel. For high-power split-term converters, a neutral point (N) needs to be generated through the converter. The existing dual-live circuit solution isolates the battery through an isolated DC-DC converter. However, to generate positive and negative DC bus voltages, it is necessary to add a balanced bridge circuit to divide the total bus voltage into two and generate an intermediate voltage N. The increase in the circuit complexity and cost issues associated with the balanced bridge circuit is a direction that needs further optimization and improvement. Utility Model Content

[0003] In view of this, the embodiments of the present application provide a dual-live-wire topology circuit and a dual-live-wire charging and discharging device, which can effectively solve the problem of high circuit cost, etc.

[0004] In a first aspect, an embodiment of the present application provides a dual live wire topology circuit, including: a first filtering module, a full-bridge DC conversion module, a first conversion circuit and a second conversion circuit;

[0005] The input ends of the first conversion circuit and the second conversion circuit are connected in series and connected to the output end of the full-bridge DC conversion module; the output ends of the first conversion circuit and the second conversion circuit are connected in parallel and used to connect a dual-live battery; the input end of the full-bridge DC conversion module is connected to the first filter module;

[0006] Wherein, the first filter module is used to access the AC dual live wire, and the full-bridge DC conversion module, the first conversion circuit and the second conversion circuit are all connected to the main control module;

[0007] The first conversion circuit comprises a first primary bridge module, a first voltage transformation module and a first secondary bridge module connected in sequence; the second conversion circuit comprises a second primary bridge module, a second voltage transformation module and a second secondary bridge module connected in sequence, the first secondary bridge module and the second secondary bridge module are connected in parallel for output; the first primary bridge module and the second primary bridge module are connected in series;

[0008] Wherein, the connection point of the first primary bridge module and the second primary bridge module in series is used as the neutral point, and the connection point is also connected to the neutral point between the AC double live wires;

[0009] The main control module is used to control the first conversion circuit and the second conversion circuit to work alternately according to a preset phase shift angle according to the working mode of the dual live wire battery.

[0010] In some embodiments, the dual live wire topology circuit also includes: a second filter module and a third filter module; the second filter module is connected in series between the first primary side bridge module and the first transformer module; the third filter module is connected in series between the second primary side bridge module and the second transformer module.

[0011] In some embodiments, the main control module is connected to the first primary bridge module, the first secondary bridge module, the second primary bridge module and the second secondary bridge module respectively;

[0012] The main control module is used for controlling the second conversion circuit and the first conversion circuit to work alternately at a first preset phase-staggered angle when the dual-live-wire battery is in a discharge mode;

[0013] The main control module is used for controlling the second conversion circuit and the first conversion circuit to work alternately at a second preset phase-staggered angle when the dual-live-wire battery is in a charging mode.

[0014] In some embodiments, the full-bridge DC conversion module and the first primary bridge module are also connected to the positive high-voltage DC bus; the full-bridge DC conversion module and the second primary bridge module are also connected to the negative high-voltage DC bus;

[0015] Wherein, in the charging mode, the AC dual live wires supply power to the dual live wire battery; in the discharging mode, the dual live wire battery supplies power to the positive high-voltage DC bus and the negative high-voltage DC bus.

[0016] In some embodiments, the full-bridge DC conversion module includes: a first switch tube, a second switch tube, a third switch tube and a fourth switch tube;

[0017] The first switch tube and the second switch tube are connected in series to form a first bridge arm, the third switch tube and the fourth switch tube are connected in series to form a second bridge arm, and the first bridge arm and the second bridge arm are connected in parallel; the first filter module is connected in series between the first bridge arm and the second bridge arm;

[0018] One end of the first bridge arm and one end of the second bridge arm are both connected to the positive high-voltage DC bus, and the other end of the first bridge arm and the other end of the second bridge arm are both connected to the negative high-voltage DC bus;

[0019] In the charging mode, the main control module outputs a pulse width modulation signal to control the first switch tube and the second switch tube to be turned on synchronously, and controls the third switch tube and the fourth switch tube to be turned on synchronously after being out of phase by the second preset out of phase angle.

[0020] In some embodiments, the first primary bridge module includes: a fifth switch tube, a sixth switch tube, a seventh switch tube and an eighth switch tube;

[0021] The fifth switch tube and the sixth switch tube are connected in series to form a third bridge arm, the seventh switch tube and the eighth switch tube are connected in series to form a fourth bridge arm, and the third bridge arm and the fourth bridge arm are connected in parallel; the first transformer module is connected in series between the third bridge arm and the fourth bridge arm;

[0022] One end of the third bridge arm and one end of the fourth bridge arm are both connected to the positive high-voltage DC bus, and the other end of the third bridge arm and the other end of the fourth bridge arm are both connected to the neutral point.

[0023] In some embodiments, the second primary bridge module includes: a ninth switch tube, a tenth switch tube, an eleventh switch tube and a twelfth switch tube;

[0024] The ninth switch tube and the tenth switch tube are connected in series to form a fifth bridge arm, the eleventh switch tube and the twelfth switch tube are connected in series to form a sixth bridge arm, and the fifth bridge arm and the sixth bridge arm are connected in parallel; the second voltage transformation module is connected in series between the fifth bridge arm and the sixth bridge arm;

[0025] One end of the fifth bridge arm and one end of the sixth bridge arm are both connected to the neutral point, and the other end of the third bridge arm and the other end of the fourth bridge arm are both connected to the negative high-voltage DC bus.

[0026] In some embodiments, the first secondary bridge module includes: a thirteenth switch tube, a fourteenth switch tube, a fifteenth switch tube and a sixteenth switch tube;

[0027] The thirteenth switch tube and the fourteenth switch tube are connected in series to form a seventh bridge arm, and the fifteenth switch tube and the sixteenth switch tube are connected in series to form an eighth bridge arm; the seventh bridge arm and the eighth bridge arm are both connected in parallel to the load; and the first transformer module is connected in series between the seventh bridge arm and the eighth bridge arm.

[0028] In some embodiments, the second secondary bridge module includes: a seventeenth switch tube, an eighteenth switch tube, a nineteenth switch tube and a twentieth switch tube;

[0029] The seventeenth switch tube and the eighteenth switch tube are connected in series to form a ninth bridge arm, and the nineteenth switch tube and the twenty-third switch tube are connected in series to form a tenth bridge arm; the ninth bridge arm and the tenth bridge arm are both connected in parallel to the load; the second transformer module is connected in series between the ninth bridge arm and the tenth bridge arm;

[0030] Wherein, in the discharge mode, when the pulse width modulation signal is in the positive half cycle, the main control module controls the fifth switch tube, the eighth switch tube, the thirteenth switch tube and the sixteenth switch tube to be turned on synchronously, and after the phase is staggered by a first preset phase stagger angle, the ninth switch tube, the twelfth switch tube, the seventeenth switch tube and the twentieth switch tube are controlled to be turned on synchronously;

[0031] In the discharge mode, when the pulse width modulation signal is in a negative half cycle, the main control module controls the sixth switch tube, the seventh switch tube, the fourteenth switch tube and the fifteenth switch tube to be turned on synchronously, and after the phase is staggered by the first preset phase stagger angle, the tenth switch tube, the eleventh switch tube, the eighteenth switch tube and the nineteenth switch tube are controlled to be turned on synchronously;

[0032] In the charging mode, when the pulse width modulation signal is in a positive half cycle, the main control module controls the fifth switch tube, the eighth switch tube, the thirteenth switch tube and the sixteenth switch tube to be turned on synchronously, and after the phase is staggered by a second preset phase stagger angle, the ninth switch tube, the twelfth switch tube, the seventeenth switch tube and the twentieth switch tube are all controlled to be turned on synchronously;

[0033] In the charging mode, when the pulse width modulation signal is in the negative half cycle, the main control module controls the sixth switch tube, the seventh switch tube, the fourteenth switch tube and the fifteenth switch tube to be turned on synchronously, and after being staggered by the second preset phase shift angle, controls the tenth switch tube, the eleventh switch tube, the eighteenth switch tube and the nineteenth switch tube to be turned on synchronously.

[0034] In a second aspect, an embodiment of the present application provides a dual-live-wire charging and discharging device, on which the dual-live-wire topology circuit as described above is provided.

[0035] The present application discloses a dual-live-wire topology circuit and a dual-live-wire charging and discharging device, in which the first filtering module in the circuit is used to access the AC dual-live wires, the first conversion circuit includes a first primary bridge module, a first transformer module and a first secondary bridge module connected in sequence; the second conversion circuit includes a second primary bridge module, a second transformer module and a second secondary bridge module connected in sequence, the first secondary bridge module and the second secondary bridge module are output in parallel; the first primary bridge module is connected in series with the second primary bridge module; the connection point of the first primary bridge module and the second primary bridge module in series serves as a neutral point, and the connection point is also connected to the neutral point between the AC dual-live wires; the main control module is used to control the first conversion circuit and the second conversion circuit to work alternately at a preset phase mismatch angle according to the working mode of the dual-live-wire battery.

[0036] The first primary bridge module is connected in series with the second primary bridge module. The connection point of the first primary bridge module and the second primary bridge module in series is used as the neutral point, and the connection point is also connected to the neutral point between the AC double live wires, thereby reducing the need for a new balanced bridge circuit to generate a neutral point, thereby effectively saving hardware costs and improving the charging and discharging power.

[0037] The embodiments of the present application have the following beneficial effects:

[0038] It can provide high-power charging and discharging circuits to meet the high-power requirements of outdoor energy storage equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A schematic diagram of the structure of a dual live wire topology circuit in an embodiment of the present application is shown;

[0041] Figure 2 A first circuit diagram of a dual live wire topology circuit in an embodiment of the present application is shown;

[0042] Figure 3 A second circuit diagram of a dual live wire topology circuit in an embodiment of the present application is shown.

[0043] Description of main component symbols:

[0044] 1: dual live wire topology circuit; 2: dual live wire battery; 3: AC dual live wire; 10: first filter module; 20: full-bridge DC conversion module; 30: first conversion circuit; 31: first primary side bridge module; 32: first voltage conversion module; 33: first secondary side bridge module; 40: second conversion circuit; 41: second primary side bridge module; 42: second voltage conversion module; 43: second secondary side bridge module; 50: main control module; 60: second filter module; 70: third filter module; T1: first transformer; T2: second transformer; Lr1: first resonant inductor; Lr2: second resonant inductor; Cr1: first resonant capacitor; Cr2: second resonant capacitor; C3: first DC support capacitor; C4: second DC support capacitor. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0046] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0047] Hereinafter, the terms "including", "having" and their cognates that can be used in various embodiments of the present application are intended only to indicate specific features, numbers, steps, operations, elements, components or a combination of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or a combination of the foregoing items or increasing the possibility of one or more features, numbers, steps, operations, elements, components or a combination of the foregoing items. In addition, the terms "first", "second", "third" and the like are only used to distinguish descriptions and cannot be understood as indicating or implying relative importance.

[0048] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meanings as those generally understood by those skilled in the art to which the various embodiments of the present application belong. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meanings as the contextual meanings in the relevant technical field and will not be interpreted as having idealized meanings or overly formal meanings unless clearly defined in the various embodiments of the present application.

[0049] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0050] See also Figure 1 An embodiment of the present application provides a dual-live-wire topology circuit 1, comprising: a first filtering module 10, a full-bridge DC conversion module 20, a first conversion circuit 30 and a second conversion circuit 40.

[0051] The input ends of the first conversion circuit 30 and the second conversion circuit 40 are connected in series, and are connected to the output end of the full-bridge DC conversion module 20 after the series connection; the output ends of the first conversion circuit 30 and the second conversion circuit 40 are connected in parallel and are used to connect the dual-live battery 2; the input end of the full-bridge DC conversion module 20 is connected to the first filter module 10. Among them, the first filter module 10 is used to access the AC dual live wire 3, and the full-bridge DC conversion module 20, the first conversion circuit 30 and the second conversion circuit 40 are all connected to the main control module 50.

[0052] The first conversion circuit 30 includes a first primary bridge module 31, a first transformer module 32 and a first secondary bridge module 33 connected in sequence; the second conversion circuit 40 includes a second primary bridge module 41, a second transformer module 42 and a second secondary bridge module 43 connected in sequence, the first secondary bridge module 33 and the second secondary bridge module 43 are output in parallel; the first primary bridge module 31 and the second primary bridge module 41 are connected in series. The connection point of the first primary bridge module 31 and the second primary bridge module 41 in series is used as the neutral point, and the connection point is also connected to the neutral point between the AC double live wires 3.

[0053] The main control module 50 is used to control the first conversion circuit 30 and the second conversion circuit 40 to work alternately according to a preset phase shift angle according to the working mode of the dual live wire battery 2.

[0054] Among them, the first conversion circuit 30 and the second conversion circuit 40 are independent of each other, the input end of the first conversion circuit 30 is the input end of the first primary bridge module 31, and the input end of the second conversion circuit 40 is the input end of the second primary bridge module 41. The first primary bridge module 31 and the second primary bridge module 41 are connected in series, and the series connection point between the two is used as the neutral point, and the series connection point is also connected to the neutral point between the AC double live wires 3.

[0055] Specifically, the specific implementation process of the dual live wire topology circuit 1 is as follows:

[0056] According to the different working modes (charging mode and discharging mode) of the dual live wire battery 2, the working modes of the AC dual live wire 3 are also different:

[0057] When the dual-live-wire battery 2 is in charging mode, the AC dual-live wire 3 inputs two standard AC mains (e.g., 220V) to the dual-live-wire topology circuit 1. Then, the first filtering module 10 filters the two connected AC mains respectively, and the full-bridge DC conversion module 20 performs voltage conversion on the two AC mains respectively.

[0058] Then, the main control module 50 controls the first conversion circuit 30 to start working first, and one of the AC currents is converted, transformed and rectified by the first conversion circuit 30 to power the dual-live battery 2, that is, one AC current is converted by the voltage of the first primary bridge module 31, transformed by the first transformer module 32 and rectified by the first secondary bridge module 33 to obtain a DC power supply voltage to power the dual-live battery 2.

[0059] The main control module 50 controls the second conversion circuit 40 to start working after the phase is misaligned by a preset phase misalignment angle (for example, 180°). At this time, the other AC power is converted, transformed and rectified by the second conversion circuit 40 to power the dual-live battery 2, that is, the other AC power is converted by the voltage of the second primary bridge module 41, transformed by the second transformer module 42 and rectified by the second secondary bridge module 43 to obtain a DC power supply voltage to power the dual-live battery 2.

[0060] When the dual live wire battery 2 is in the discharge mode, the dual live wire battery 2 provides DC power to the first conversion circuit 30 and the second conversion circuit 40 respectively. Then, the main control module 50 controls the first conversion circuit 30 to start working first, and the first conversion circuit 30 converts, transforms and rectifies the DC power supply voltage, that is, the DC power supply is converted by the voltage of the first secondary bridge module 33, transformed by the first transformer module 32 and rectified by the first primary bridge module 31.

[0061] The main control module 50 controls the second conversion circuit 40 to start working after the phase is shifted by another preset phase shift angle (for example, 90°). At this time, the second conversion circuit 40 converts, transforms and rectifies the DC power supply voltage, that is, the DC power supply is converted by the voltage of the second secondary bridge module 43, transformed by the second transformer module 42 and rectified by the second primary bridge module 41.

[0062] In the present application, by connecting the input ends of the first conversion circuit 30 and the second conversion circuit 40 in series and using the connection point as the neutral point to connect it to the neutral point between the AC double live wires 3, the construction of the neutral point is reduced, thereby effectively reducing the hardware cost.

[0063] In addition, in the present application, the main control module 50 controls the first conversion circuit 30 and the second conversion circuit 40 to work alternately at a preset phase mismatch angle according to the working mode of the dual live wire battery 2, that is, by controlling the second conversion circuit 40 and the first conversion circuit 30 to work alternately at different preset phase mismatch angles (for example, 180° or 90°) according to the different working modes of the dual live wire battery 2, thereby realizing the charging and discharging of the dual live wire battery 2.

[0064] Furthermore, the main control module 50 is connected to the first primary bridge module 31 , the first secondary bridge module 33 , the second primary bridge module 41 and the second secondary bridge module 43 respectively.

[0065] The main control module 50 is used to control the second conversion circuit 40 and the first conversion circuit 30 to work alternately at a first preset phase misalignment angle when the dual live wire battery 2 is in a discharge mode; the main control module 50 is used to control the second conversion circuit 40 and the first conversion circuit 30 to work alternately at a second preset phase misalignment angle when the dual live wire battery 2 is in a charging mode.

[0066] The first preset phase shift angle includes 180°, and the second preset phase shift angle includes 90°.

[0067] Specifically, the main control module 50, such as an MCU, outputs a pulse width modulation signal to the first primary bridge module 31, the first secondary bridge module 33, the second primary bridge module 41, and the second secondary bridge module 43 to control the second conversion circuit 40 and the first conversion circuit 30 to work alternately at a preset phase misalignment angle:

[0068] When the dual live wire battery 2 is in the discharge mode, at this time, the main control module 50 adjusts the output pulse width modulation signal to control the second conversion circuit 40 and the first conversion circuit 30 to work alternately after being staggered by a first preset phase angle (for example, 180°), which is beneficial to offset the ripple on the discharge side (the left circuit of the first conversion circuit 30 and the second conversion circuit 40); and when the dual live wire battery 2 is in the charging mode, the second conversion circuit 40 and the first conversion circuit 30 are controlled to work alternately after being staggered by a second preset phase angle (for example, 90°), which is beneficial to offset the ripple on the charging side (the right circuit of the first conversion circuit 30 and the second conversion circuit 40).

[0069] Furthermore, the full-bridge DC conversion module 20 and the first primary bridge module 31 are also connected to the positive high-voltage DC bus; the full-bridge DC conversion module 20 and the second primary bridge module 41 are also connected to the negative high-voltage DC bus; wherein, in the charging mode, the AC dual live wire 3 supplies power to the dual live wire battery 2; in the discharging mode, the dual live wire battery 2 supplies power to the positive high-voltage DC bus and the negative high-voltage DC bus.

[0070] Specifically, when the dual-live-wire battery 2 is in charging mode, the AC dual-live-wire 3 inputs two AC mains powers, one of which is filtered by the first filter module 10, and then, after voltage conversion by the full-bridge DC conversion module 20, and voltage conversion, transformation and rectification by the first conversion circuit 30, it is used to power the dual-live-wire battery 2.

[0071] In addition, the other AC power is filtered by the first filter module 10, and then, after a preset phase shift angle, the other AC power is voltage-converted by the full-bridge DC conversion module 20, and voltage-converted, transformed and rectified by the second conversion circuit 40 to power the dual-live-wire battery 2.

[0072] However, when the dual live wire battery 2 is in the discharge mode, the dual live wire battery 2 provides DC power to the first conversion circuit 30 and the second conversion circuit 40 respectively, and then the positive DC power is converted, transformed and rectified by the first conversion circuit 30 to supply power to the positive high-voltage DC bus. Moreover, after another preset phase misalignment angle, the negative DC power is converted, transformed and rectified by the second conversion circuit 40 to supply power to the negative high-voltage DC bus.

[0073] In the present application, according to the two working modes of the dual-live-wire battery 2, the dual-live-wire battery 2 is powered by the dual-live-wire battery 2, or the dual-live-wire battery 2 is powered by the positive high-voltage DC bus and the negative high-voltage DC bus, thereby realizing the charging and discharging of the dual-live-wire battery 2 and improving the charging and discharging power.

[0074] For further information, see Figure 2 The first filter module 10 includes two chokes (represented by L1 and L2 in the circuit) and two filter capacitors (represented by C1 and C2 in the circuit). The chokes are used to suppress electromagnetic interference, and can suppress the electromagnetic interference generated by the leakage magnetic flux of the transformer in the first transformation module 32 and the second transformation module 42; and the filter capacitors are used to filter out the AC component, and can filter out the AC component in the output voltage of the transformer, so that the current is more stable.

[0075] Furthermore, the full-bridge DC conversion module 20 includes: a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4.

[0076] The first switch tube Q1 and the second switch tube Q2 are connected in series to form a first bridge arm, the third switch tube Q3 and the fourth switch tube Q4 are connected in series to form a second bridge arm, and the first bridge arm and the second bridge arm are connected in parallel; the first filter module 10 is connected in series between the first bridge arm and the second bridge arm; one end of the first bridge arm and one end of the second bridge arm are both connected to the positive high-voltage DC bus, and the other end of the first bridge arm and the other end of the second bridge arm are both connected to the negative high-voltage DC bus.

[0077] In the charging mode, the main control module 50 outputs a pulse width modulation signal to control the first switch tube Q1 and the second switch tube Q2 to be turned on synchronously, and after being phase-shifted by the second preset phase-shift angle, controls the third switch tube Q3 and the fourth switch tube Q4 to be turned on synchronously.

[0078] In this embodiment, all the switch tubes are field effect tubes (MOS tubes), and in another embodiment of the present application, all the switch tubes can also be triode tubes, and all the switch tubes are controlled by inputting pulse width modulation signals (PWM) through the main control module 50. Among them, the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 constitute a first rectifier bridge.

[0079] Specifically, when the dual-live-wire battery 2 is in the charging mode, the main control module 50 outputs a pulse width modulation signal to control the first switch tube Q1 and the second switch tube Q2 to open synchronously, so that one of the AC dual-live wires 3 is simultaneously transmitted to the dual-live-wire battery 2 through the first switch tube Q1 and the second switch tube Q2.

[0080] Then, after the current pulse width modulation signal is out of phase with the previous pulse width modulation signal by the second preset phase misalignment angle, the main control module 50 controls the third switch tube Q3 and the fourth switch tube Q4 to open synchronously according to the current pulse width modulation signal, so that the other AC power in the AC dual live wire 3 is transmitted to the dual live wire battery 2 through the third switch tube Q3 and the fourth switch tube Q4 at the same time.

[0081] Furthermore, the dual live wire topology circuit 1 also includes: a first DC support capacitor C3 and a second DC support capacitor C4; the first DC support capacitor C3 is connected in series between the medium positive high-voltage DC bus and the neutral point, and the second DC support capacitor C4 is connected in series between the medium negative high-voltage DC bus and the neutral point.

[0082] The DC support capacitor is a DC-Link capacitor or a DC support capacitor. In other embodiments of the present application, the DC support capacitor can be replaced by an electrolytic capacitor and a film capacitor. The DC support capacitor has very high voltage stability and low leakage current characteristics, and is mainly used for filtering and balancing working current in DC power supply circuits.

[0083] Furthermore, the first primary bridge module 31 includes a fifth switch tube Q5, a sixth switch tube Q6, a seventh switch tube Q7 and an eighth switch tube Q8.

[0084] The fifth switch tube Q5 and the sixth switch tube Q6 are connected in series to form a third bridge arm, the seventh switch tube Q7 and the eighth switch tube Q8 are connected in series to form a fourth bridge arm, and the third bridge arm and the fourth bridge arm are connected in parallel; the first transformer module 32 is connected in series between the third bridge arm and the fourth bridge arm; one end of the third bridge arm and one end of the fourth bridge arm are both connected to the positive high-voltage DC bus, and the other end of the third bridge arm and the other end of the fourth bridge arm are both connected to the neutral point.

[0085] Similarly, the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7 and the eighth switch tube Q8 form a second rectifier bridge.

[0086] Specifically, the third bridge arm and the fourth bridge arm are connected in parallel and then connected in series with the second primary bridge module 41 .

[0087] Furthermore, the first conversion circuit 30 includes: a first transformer T1; a primary side of the first transformer T1 is connected in series with a midpoint of the third bridge arm and a midpoint of the fourth bridge arm.

[0088] Furthermore, the first secondary bridge module 33 includes a thirteenth switch tube Q13, a fourteenth switch tube Q14, a fifteenth switch tube Q15 and a sixteenth switch tube Q16.

[0089] The thirteenth switch tube Q13 and the fourteenth switch tube Q14 are connected in series to form the seventh bridge arm, and the fifteenth switch tube Q15 and the sixteenth switch tube Q16 are connected in series to form the eighth bridge arm; the seventh bridge arm and the eighth bridge arm are both connected in parallel with the load; the first transformer module 32 is connected in series between the seventh bridge arm and the eighth bridge arm.

[0090] Specifically, similarly, the thirteenth switch tube Q13, the fourteenth switch tube Q14, the fifteenth switch tube Q15 and the sixteenth switch tube Q16 form a third rectifier bridge. The secondary side of the first transformer T1 is connected in series with the midpoint of the seventh bridge arm and the midpoint of the eighth bridge arm.

[0091] Furthermore, the second primary bridge module 41 includes a ninth switch tube Q9 , a tenth switch tube Q10 , an eleventh switch tube Q11 and a twelfth switch tube Q12 .

[0092] The ninth switch tube Q9 and the tenth switch tube Q10 are connected in series to form the fifth bridge arm, the eleventh switch tube Q11 and the twelfth switch tube Q12 are connected in series to form the sixth bridge arm, and the fifth bridge arm and the sixth bridge arm are connected in parallel; the second transformer module 42 is connected in series between the fifth bridge arm and the sixth bridge arm; one end of the fifth bridge arm and one end of the sixth bridge arm are both connected to the neutral point, and the other end of the third bridge arm and the other end of the fourth bridge arm are both connected to the negative high-voltage DC bus.

[0093] Specifically, similarly, the ninth switch tube Q9, the tenth switch tube Q10, the eleventh switch tube Q11 and the twelfth switch tube Q12 form a fourth rectifier bridge.

[0094] Among them, the second rectifier bridge and the fourth rectifier bridge are connected in series, and the series connection point is used as the neutral point and connected to the neutral point between the AC double live wires 3, thereby avoiding the need to add a balanced bridge circuit in the prior art to construct the neutral point, which leads to an increase in circuit hardware costs.

[0095] Furthermore, the second conversion circuit 40 includes: a second transformer T2; the primary side of the second transformer T2 is connected in series with the midpoint of the fifth bridge arm and the midpoint of the sixth bridge arm.

[0096] Furthermore, the second secondary bridge module 43 includes a seventeenth switch tube Q17 , an eighteenth switch tube Q18 , a nineteenth switch tube Q19 and a twentieth switch tube Q20 .

[0097] The seventeenth switch tube Q17 and the eighteenth switch tube Q18 are connected in series to form a ninth bridge arm, and the nineteenth switch tube Q19 and the twentieth switch tube Q20 are connected in series to form a tenth bridge arm; the ninth bridge arm and the tenth bridge arm are both connected in parallel to the load; the second transformer module 42 is connected in series between the ninth bridge arm and the tenth bridge arm.

[0098] Among them, in the discharge mode, when the pulse width modulation signal is in the positive half cycle, the main control module 50 controls the fifth switch tube Q5, the eighth switch tube Q8, the thirteenth switch tube Q13 and the sixteenth switch tube Q16 to be turned on synchronously, and after the phase is staggered by the first preset phase angle, the ninth switch tube Q9, the twelfth switch tube Q12, the seventeenth switch tube Q17 and the twentieth switch tube Q20 are all controlled to be turned on synchronously.

[0099] In the discharge mode, when the pulse width modulation signal is in the negative half cycle, the main control module 50 controls the sixth switch tube Q6, the seventh switch tube Q7, the fourteenth switch tube Q14 and the fifteenth switch tube Q15 to be turned on synchronously, after the phase is staggered by the first preset phase angle, and controls the tenth switch tube Q10, the eleventh switch tube Q11, the eighteenth switch tube Q18 and the nineteenth switch tube Q19 to be turned on synchronously.

[0100] In the charging mode, when the pulse width modulation signal is in the positive half cycle, the main control module 50 controls the fifth switch tube Q5, the eighth switch tube Q8, the thirteenth switch tube Q13 and the sixteenth switch tube Q16 to be turned on synchronously, and after the phase is staggered by the second preset phase angle, the ninth switch tube Q9, the twelfth switch tube Q12, the seventeenth switch tube Q17 and the twentieth switch tube Q20 are all turned on synchronously.

[0101] In the charging mode, when the pulse width modulation signal is in the negative half cycle, the main control module 50 controls the sixth switch tube Q6, the seventh switch tube Q7, the fourteenth switch tube Q14 and the fifteenth switch tube Q15 to be turned on synchronously, and after the phase is staggered by the second preset phase stagger angle, the tenth switch tube Q10, the eleventh switch tube Q11, the eighteenth switch tube Q18 and the nineteenth switch tube Q19 are controlled to be turned on synchronously.

[0102] Specifically, similarly, the seventeenth switch tube Q17, the eighteenth switch tube Q18, the nineteenth switch tube Q19 and the twentieth switch tube Q20 form a fifth rectifier bridge. The secondary side of the second transformer T2 is connected in series with the midpoint of the ninth bridge arm and the midpoint of the tenth bridge arm.

[0103] The main control module 50 is used to output a pulse width modulation signal to control the major rectifier bridges: when the dual-live battery 2 is in the discharge mode and the pulse width modulation signal is in the positive half cycle, the main control module 50 controls the fifth switch tube Q5, the eighth switch tube Q8, the thirteenth switch tube Q13 and the sixteenth switch tube Q16 to be turned on synchronously, after the phase is staggered by the first preset phase angle, and controls the ninth switch tube Q9, the twelfth switch tube Q12, the seventeenth switch tube Q17 and the twentieth switch tube Q20 to be turned on synchronously, which is conducive to offsetting the ripple on the discharge side (the circuit ripple on the left side of the first transformer T1 and the left side of the second transformer T2).

[0104] Moreover, when the dual live wire battery 2 is in the discharge mode and the pulse width modulation signal is in the negative half cycle, the main control module 50 controls the sixth switch tube Q6, the seventh switch tube Q7, the fourteenth switch tube Q14 and the fifteenth switch tube Q15 to be turned on synchronously, after the phase is staggered by the first preset phase angle, and controls the tenth switch tube Q10, the eleventh switch tube Q11, the eighteenth switch tube Q18 and the nineteenth switch tube Q19 to be turned on synchronously.

[0105] However, when the dual live wire battery 2 is in the charging mode and the pulse width modulation signal is in the positive half cycle, the main control module 50 controls the fifth switch tube Q5, the eighth switch tube Q8, the thirteenth switch tube Q13 and the sixteenth switch tube Q16 to be turned on synchronously, after the phase is staggered by the second preset phase angle, and controls the ninth switch tube Q9, the twelfth switch tube Q12, the seventeenth switch tube Q17 and the twentieth switch tube Q20 to be turned on synchronously, which is beneficial to offset the ripples on the charging side (circuit ripples on the right side of the first transformer T1 and the right side of the second transformer T2).

[0106] Moreover, when the dual live wire battery 2 is in the charging mode and the pulse width modulation signal is in the negative half cycle, the main control module 50 controls the sixth switch tube Q6, the seventh switch tube Q7, the fourteenth switch tube Q14 and the fifteenth switch tube Q15 to be turned on synchronously, and after the phase is staggered by the second preset phase stagger angle, the tenth switch tube Q10, the eleventh switch tube Q11, the eighteenth switch tube Q18 and the nineteenth switch tube Q19 are controlled to be turned on synchronously.

[0107] in, Figure 2 The circuit diagram shown is a circuit diagram of the first filtering module 10 in this embodiment, which is not specifically limited here, and the circuit diagram can be adaptively changed according to the scenario.

[0108] Furthermore, in another embodiment of the present application, the dual live wire topology circuit 1 also includes: a second filter module 60 and a third filter module 70; the second filter module 60 is connected in series between the first primary side bridge module 31 and the first transformer module 32; the third filter module 70 is connected in series between the second primary side bridge module 41 and the second transformer module 42.

[0109] Among them, Figure 3 As shown, the second filtering module 60 includes: a first resonant inductor Lr1 and a first resonant capacitor Cr1; and the third filtering module 70 includes: a second resonant inductor Lr2 and a second resonant capacitor Cr2.

[0110] Specifically, the resonant inductor is used to filter out the harmonics in the AC power supply and improve the stability of the DC voltage, while the resonant capacitor is used to filter out the ripple in the DC voltage and improve the quality of the DC voltage. In addition, the first resonant inductor Lr1 and the first resonant capacitor Cr1, as well as the second resonant inductor Lr2 and the second resonant capacitor Cr2 together constitute a resonant circuit, which can enable the circuit to achieve soft start. During the soft start process, the first inductor and the second inductor can limit the rapid increase of the current, thereby reducing the circuit impact, and the first resonant capacitor Cr1 and the second resonant capacitor Cr2 will absorb the voltage on the DC bus, thereby preventing the DC bus voltage from overshooting. At the same time, the first resonant capacitor Cr1 and the second resonant capacitor Cr2 will also work together with the first inductor and the second inductor to form an LC filter, thereby reducing the loss of the first inductor and the second inductor.

[0111] in, Figure 3 The circuit diagram shown is a circuit diagram of the second filtering module 60 in this embodiment, which is not specifically limited here, and the circuit diagram can be adaptively changed according to the scenario.

[0112] In order to better understand the present invention, the following Figure 2 and Figure 3 The working principle of the dual live wire charging and discharging circuit of the utility model is described in detail:

[0113] Among them, the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 constitute a first rectifier bridge; the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7 and the eighth switch tube Q8 constitute a second rectifier bridge; the thirteenth switch tube Q13, the fourteenth switch tube Q14, the fifteenth switch tube Q15 and the sixteenth switch tube Q16 constitute a third rectifier bridge; the ninth switch tube Q9, the tenth switch tube Q10, the eleventh switch tube Q11 and the twelfth switch tube Q12 constitute a fourth rectifier bridge; the seventeenth switch tube Q17, the eighteenth switch tube Q18, the nineteenth switch tube Q19 and the twentieth switch tube Q20 constitute a fifth rectifier bridge.

[0114] According to the different working modes of the dual live wire battery 2, the main control module 50 controls the different conduction states of the major rectifier bridges to realize charging of the dual live wire battery 2 or discharging of the dual live wire battery 2:

[0115] First, the main control module 50 is used to output a pulse width modulation signal to control each rectifier bridge:

[0116] When the dual live wire battery 2 is in the discharge mode, the main control module 50 controls the first switch tube Q1 and the second switch tube Q2 to be in a synchronously turned-on state all the time; when the pulse width modulation signal is in the positive half cycle, the main control module 50 first controls the fifth switch tube Q5, the eighth switch tube Q8, the thirteenth switch tube Q13 and the sixteenth switch tube Q16 to be turned on synchronously, and after the phase is staggered by 180° (the first preset phase staggered angle), the ninth switch tube Q9, the twelfth switch tube Q12, the seventeenth switch tube Q17 and the twentieth switch tube Q20 are all controlled to be turned on synchronously.

[0117] When the pulse width modulation signal is in the negative half cycle, the main control module 50 first controls the sixth switch tube Q6, the seventh switch tube Q7, the fourteenth switch tube Q14 and the fifteenth switch tube Q15 to be turned on synchronously, and after the phase is staggered by the first preset phase angle, the tenth switch tube Q10, the eleventh switch tube Q11, the eighteenth switch tube Q18 and the nineteenth switch tube Q19 are all turned on synchronously.

[0118] So, if Figure 3 As shown, in the discharge mode, the current in the circuit flows from the dual-live battery 2 to HVDC_BUS+ (positive high-voltage DC bus), AC-N, and HVDC_BUS- (negative high-voltage DC bus), AC-N (neutral point or midpoint), that is, the positive DC power provided by the dual-live battery 2 supplies power to the positive high-voltage DC bus, and the negative DC power supplies power to the negative high-voltage DC bus.

[0119] However, when the dual live wire battery 2 is in the charging mode, the main control module 50 controls the third switch tube Q3 and the fourth switch tube Q4 to be in a synchronously turned-on state all the time; when the pulse width modulation signal is in the positive half cycle, the main control module 50 first controls the fifth switch tube Q5, the eighth switch tube Q8, the thirteenth switch tube Q13 and the sixteenth switch tube Q16 to be turned on synchronously, and after the phase is staggered by 90° (the second preset phase staggered angle), the ninth switch tube Q9, the twelfth switch tube Q12, the seventeenth switch tube Q17 and the twentieth switch tube Q20 are all controlled to be turned on synchronously.

[0120] The fifth switch tube Q5, the eighth switch tube Q8, the thirteenth switch tube Q13 and the sixteenth switch tube Q16 are turned on synchronously, and after being out of phase by 180° (a first preset out of phase angle), the ninth switch tube Q9, the twelfth switch tube Q12, the seventeenth switch tube Q17 and the twentieth switch tube Q20 are controlled to be turned on synchronously.

[0121] When the pulse width modulation signal is in the negative half cycle, the main control module 50 first controls the sixth switch tube Q6, the seventh switch tube Q7, the fourteenth switch tube Q14 and the fifteenth switch tube Q15 to be turned on synchronously, and after the phase is staggered by the second preset phase angle, the tenth switch tube Q10, the eleventh switch tube Q11, the eighteenth switch tube Q18 and the nineteenth switch tube Q19 are all turned on synchronously.

[0122] Then, in the charging mode, the current in the circuit flows from AC-L1 and AC-L2 (collectively referred to as dual live wires) to the dual live wire battery 2 , that is, the two AC lines provided by the AC dual live wire 3 power the dual live wire battery 2 .

[0123] Furthermore, an embodiment of the present application provides a dual-live-wire charging and discharging device, on which the dual-live-wire charging and discharging device is provided with the dual-live-wire topology circuit 1 as described above; since the dual-live-wire charging and discharging circuit is described in detail above, it will not be repeated here.

[0124] In summary, the present application discloses a dual-live-wire topology circuit and a dual-live-wire charging and discharging device, which is connected in series through a first primary bridge module and a second primary bridge module. The connection point of the first primary bridge module and the second primary bridge module in series is used as a neutral point, and the connection point is also connected to the neutral point between the AC dual live wires, thereby reducing the need for a new balanced bridge circuit to generate a neutral point, thereby effectively saving hardware costs and improving charging and discharging power.

[0125] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A dual live wire topology circuit, characterized in that: include: A first filtering module, a full-bridge DC conversion module, a first conversion circuit and a second conversion circuit; The input ends of the first conversion circuit and the second conversion circuit are connected in series and connected to the output end of the full-bridge DC conversion module; the output ends of the first conversion circuit and the second conversion circuit are connected in parallel and used to connect a dual-live battery; the input end of the full-bridge DC conversion module is connected to the first filter module; Wherein, the first filter module is used to access the AC dual live wire, and the full-bridge DC conversion module, the first conversion circuit and the second conversion circuit are all connected to the main control module; The first conversion circuit comprises a first primary bridge module, a first voltage transformation module and a first secondary bridge module connected in sequence; the second conversion circuit comprises a second primary bridge module, a second voltage transformation module and a second secondary bridge module connected in sequence, the first secondary bridge module and the second secondary bridge module are connected in parallel for output; the first primary bridge module and the second primary bridge module are connected in series; Wherein, the connection point of the first primary bridge module and the second primary bridge module in series is used as the neutral point, and the connection point is also connected to the neutral point between the AC double live wires; The main control module is used to control the first conversion circuit and the second conversion circuit to work alternately according to a preset phase shift angle according to the working mode of the dual live wire battery.

2. The dual live wire topology circuit according to claim 1, characterized in that: Also includes: A second filter module and a third filter module; the second filter module is connected in series between the first primary bridge module and the first transformer module; the third filter module is connected in series between the second primary bridge module and the second transformer module.

3. The dual live wire topology circuit according to claim 1, characterized in that: The main control module is respectively connected to the first primary bridge module, the first secondary bridge module, the second primary bridge module and the second secondary bridge module; The main control module is used for controlling the second conversion circuit and the first conversion circuit to work alternately at a first preset phase-staggered angle when the dual-live-wire battery is in a discharge mode; The main control module is used for controlling the second conversion circuit and the first conversion circuit to work alternately at a second preset phase-staggered angle when the dual-live-wire battery is in a charging mode.

4. The dual live wire topology circuit according to claim 3, characterized in that: The full-bridge DC conversion module and the first primary bridge module are also connected to the positive high-voltage DC bus; the full-bridge DC conversion module and the second primary bridge module are also connected to the negative high-voltage DC bus; Wherein, in the charging mode, the AC dual live wires supply power to the dual live wire battery; in the discharging mode, the dual live wire battery supplies power to the positive high-voltage DC bus and the negative high-voltage DC bus.

5. The dual live wire topology circuit according to claim 4, characterized in that: The full-bridge DC conversion module includes: a first switch tube, a second switch tube, a third switch tube and a fourth switch tube; The first switch tube and the second switch tube are connected in series to form a first bridge arm, the third switch tube and the fourth switch tube are connected in series to form a second bridge arm, and the first bridge arm and the second bridge arm are connected in parallel; the first filter module is connected in series between the first bridge arm and the second bridge arm; One end of the first bridge arm and one end of the second bridge arm are both connected to the positive high-voltage DC bus, and the other end of the first bridge arm and the other end of the second bridge arm are both connected to the negative high-voltage DC bus; In the charging mode, the main control module outputs a pulse width modulation signal to control the first switch tube and the second switch tube to be turned on synchronously, and controls the third switch tube and the fourth switch tube to be turned on synchronously after being out of phase by the second preset out of phase angle.

6. The dual live wire topology circuit according to claim 4, characterized in that: The first primary side bridge module includes: a fifth switch tube, a sixth switch tube, a seventh switch tube and an eighth switch tube; The fifth switch tube and the sixth switch tube are connected in series to form a third bridge arm, the seventh switch tube and the eighth switch tube are connected in series to form a fourth bridge arm, and the third bridge arm and the fourth bridge arm are connected in parallel; the first transformer module is connected in series between the third bridge arm and the fourth bridge arm; One end of the third bridge arm and one end of the fourth bridge arm are both connected to the positive high-voltage DC bus, and the other end of the third bridge arm and the other end of the fourth bridge arm are both connected to the neutral point.

7. The dual live wire topology circuit according to claim 6, characterized in that: The second primary side bridge module includes: a ninth switch tube, a tenth switch tube, an eleventh switch tube and a twelfth switch tube; The ninth switch tube and the tenth switch tube are connected in series to form a fifth bridge arm, the eleventh switch tube and the twelfth switch tube are connected in series to form a sixth bridge arm, and the fifth bridge arm and the sixth bridge arm are connected in parallel; the second voltage transformation module is connected in series between the fifth bridge arm and the sixth bridge arm; One end of the fifth bridge arm and one end of the sixth bridge arm are both connected to the neutral point, and the other end of the third bridge arm and the other end of the fourth bridge arm are both connected to the negative high-voltage DC bus.

8. The dual live wire topology circuit according to claim 7, characterized in that: The first secondary side bridge module includes: a thirteenth switch tube, a fourteenth switch tube, a fifteenth switch tube and a sixteenth switch tube; The thirteenth switch tube and the fourteenth switch tube are connected in series to form a seventh bridge arm, and the fifteenth switch tube and the sixteenth switch tube are connected in series to form an eighth bridge arm; the seventh bridge arm and the eighth bridge arm are both connected in parallel to the load; and the first transformer module is connected in series between the seventh bridge arm and the eighth bridge arm.

9. The dual live wire topology circuit according to claim 8, characterized in that: The second secondary side bridge module includes: a seventeenth switch tube, an eighteenth switch tube, a nineteenth switch tube and a twentieth switch tube; The seventeenth switch tube and the eighteenth switch tube are connected in series to form a ninth bridge arm, and the nineteenth switch tube and the twenty-third switch tube are connected in series to form a tenth bridge arm; the ninth bridge arm and the tenth bridge arm are both connected in parallel to the load; the second transformer module is connected in series between the ninth bridge arm and the tenth bridge arm; Wherein, in the discharge mode, when the pulse width modulation signal is in the positive half cycle, the main control module controls the fifth switch tube, the eighth switch tube, the thirteenth switch tube and the sixteenth switch tube to be turned on synchronously, and after the phase is staggered by a first preset phase stagger angle, the ninth switch tube, the twelfth switch tube, the seventeenth switch tube and the twentieth switch tube are controlled to be turned on synchronously; In the discharge mode, when the pulse width modulation signal is in a negative half cycle, the main control module controls the sixth switch tube, the seventh switch tube, the fourteenth switch tube and the fifteenth switch tube to be turned on synchronously, and after the phase is staggered by the first preset phase stagger angle, the tenth switch tube, the eleventh switch tube, the eighteenth switch tube and the nineteenth switch tube are controlled to be turned on synchronously; In the charging mode, when the pulse width modulation signal is in a positive half cycle, the main control module controls the fifth switch tube, the eighth switch tube, the thirteenth switch tube and the sixteenth switch tube to be turned on synchronously, and after the phase is staggered by a second preset phase stagger angle, the ninth switch tube, the twelfth switch tube, the seventeenth switch tube and the twentieth switch tube are all controlled to be turned on synchronously; In the charging mode, when the pulse width modulation signal is in the negative half cycle, the main control module controls the sixth switch tube, the seventh switch tube, the fourteenth switch tube and the fifteenth switch tube to be turned on synchronously, and after being staggered by the second preset phase shift angle, controls the tenth switch tube, the eleventh switch tube, the eighteenth switch tube and the nineteenth switch tube to be turned on synchronously.

10. A dual live wire charging and discharging device, characterized in that: The dual-live-wire charging and discharging device is provided with a dual-live-wire topology circuit as described in any one of claims 1 to 9.

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