A kind of topology circuit, on-board charger and electric device

Abstract

The application discloses a kind of topological circuit, vehicle charger and electric equipment, it is related to electric vehicle technical field, it is to realize the power output of wider voltage when charging.The topological circuit includes: first bridge arm circuit, second bridge arm circuit, transformer and energy storage circuit;First bridge arm circuit is used to receive direct current;Second bridge arm circuit is electrically connected with first bridge arm circuit by transformer;The input end of second bridge arm circuit receives direct current from the output of first bridge arm circuit;Energy storage circuit is connected with second bridge arm circuit, and energy storage circuit is used to store direct current, and charge battery pack;Energy storage circuit includes: first subcircuit and second subcircuit;In the case where second bridge arm circuit is alternately conducted, first subcircuit and second subcircuit alternately store direct current.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle technology, and in particular to a topology circuit, an on-board charger, and an electrical device. Background Technology

[0002] With the rise of the new energy vehicle industry, the industry has entered a new stage of large-scale development. Currently, high-voltage power batteries or low-voltage batteries have become the most important energy-providing components, making it crucial to charge these batteries via onboard chargers.

[0003] Existing vehicle chargers, through power factor correction circuits and resonant converters, can only meet the output requirements of a narrow voltage range and cannot achieve an output range of a wider voltage range. Summary of the Invention

[0004] The purpose of this invention is to provide a topology circuit, an on-board charger, and an electrical device that aims to achieve a wider voltage power output during charging.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a topology circuit, comprising: a first bridge arm circuit, a second bridge arm circuit, a transformer, and an energy storage circuit; the first bridge arm circuit is used to receive direct current; the second bridge arm circuit is electrically connected to the first bridge arm circuit through the transformer; the input terminal of the second bridge arm circuit receives direct current output from the first bridge arm circuit; the energy storage circuit is connected to the second bridge arm circuit, and the energy storage circuit is used to store direct current and charge a battery pack; the energy storage circuit comprises: a first sub-circuit and a second sub-circuit; when the second bridge arm circuit is alternately turned on, the first sub-circuit and the second sub-circuit alternately store direct current.

[0007] Based on the above scheme, some embodiments of this application provide a topology circuit that increases the output voltage by alternately storing electrical energy for the energy storage circuit. First, direct current is transmitted to a transformer via a first bridge arm circuit, and then transmitted to a second bridge arm circuit via the transformer. The second bridge arm circuit stores direct current for the first sub-circuit of the energy storage circuit. Then, by switching the on / off states of the first and second bridge arm circuits, direct current is stored for the second sub-circuit of the energy storage circuit. In this way, the amount of charge stored in the energy storage circuit is further increased, meeting the requirements for a wide voltage range.

[0008] In some embodiments, the first terminal of the energy storage circuit is electrically connected to the first output terminal of the second bridge arm circuit, and the second terminal of the energy storage circuit is electrically connected to the second output terminal of the second bridge arm circuit; when the first terminal of the energy storage circuit is connected to the second bridge arm circuit, the first sub-circuit stores DC power; when the second terminal of the energy storage circuit is connected to the second bridge arm circuit, the second sub-circuit stores DC power.

[0009] In some embodiments, the first sub-circuit includes: a first capacitor;

[0010] The first terminal of the first capacitor is the first terminal of the energy storage circuit; the second terminal of the first capacitor is the third terminal of the energy storage circuit.

[0011] In some embodiments, the second sub-circuit includes: a second capacitor; a first terminal of the second capacitor is electrically connected to a second terminal of the first capacitor, and the second terminal of the second capacitor is a second terminal of the energy storage circuit.

[0012] In some embodiments, the second bridge arm circuit includes: a first bridge arm and a second bridge arm; a first end of the first bridge arm is a first output terminal of the second bridge arm circuit, and a second end of the first bridge arm is a second output terminal of the second bridge arm circuit; a third end of the first bridge arm is electrically connected to a first output terminal of a transformer; a first end of the second bridge arm is a first output terminal of the second bridge arm circuit, and a second end of the second bridge arm is a second output terminal of the second bridge arm circuit; a third end of the second bridge arm is electrically connected to a second output terminal of the transformer and also electrically connected to a first terminal of a switching circuit; wherein, the connection point between the upper and lower bridge arms of the first bridge arm is the third end of the first bridge arm; the connection point between the upper and lower bridge arms of the second bridge arm is the third end of the second bridge arm.

[0013] In some embodiments, the topology circuit further includes: a switching circuit; the switching circuit is connected between the third end of the second bridge arm and the third end of the energy storage circuit; when the second bridge arm circuit is alternately turned on, the switching circuit is used to control the first sub-circuit and the second sub-circuit of the energy storage circuit to alternately store DC power.

[0014] In some embodiments, the switching circuit includes: a first relay; a first terminal of the first relay is a first terminal of the switching circuit, and a second terminal of the first relay is a second terminal of the switching circuit.

[0015] In some embodiments, when the upper arm of the first bridge arm is turned on and the first relay is closed, the first capacitor is used to store direct current; or, when the lower arm of the first bridge arm is turned on and the first relay is closed, the second capacitor is used to store direct current.

[0016] In some embodiments, when the upper arm of the first bridge arm and the lower arm of the second bridge arm are turned on and the first relay is turned off, both the first capacitor and the second capacitor are used to store direct current.

[0017] In some embodiments, the switching circuit further includes: a first switching transistor and a second switching transistor; the first terminal of the first switching transistor is the first terminal of the switching circuit, the second terminal of the first switching transistor is electrically connected to the second terminal of the second switching transistor, and the first terminal of the second switching transistor is the second terminal of the switching circuit.

[0018] In some embodiments, when the upper bridge arm of the first bridge arm is turned on and the first and second switching transistors are turned on, the first capacitor is used to store direct current; or, when the lower bridge arm of the first bridge arm is turned on and the first and second switching transistors are turned on, the second capacitor is used to store direct current.

[0019] In some embodiments, when the upper arm of the first bridge arm and the lower arm of the second bridge arm are turned on, and the first and second switching transistors are turned off, both the first and second capacitors are used to store DC current.

[0020] In some embodiments, the first bridge arm circuit includes: a third bridge arm and a fourth bridge arm; a first end of the third bridge arm is electrically connected to a first end of the voltage conversion circuit, and a second end of the third bridge arm is electrically connected to a second end of the voltage conversion circuit; a third end of the third bridge arm is electrically connected to a first input end of the transformer; a first end of the fourth bridge arm is electrically connected to a first end of the voltage conversion circuit, and a second end of the fourth bridge arm is electrically connected to a second end of the voltage conversion circuit; a third end of the fourth bridge arm is electrically connected to a second input end of the transformer; wherein, the connection end between the upper and lower bridge arms of the third bridge arm is the third end of the third bridge arm; the connection end between the upper and lower bridge arms of the fourth bridge arm is the third end of the fourth bridge arm.

[0021] In some embodiments, when the upper arm of the third bridge arm, the lower arm of the fourth bridge arm, and the upper arm of the first bridge arm are turned on, and the switching circuit is turned on, the first capacitor is used to store direct current; or, when the lower arm of the third bridge arm, the upper arm of the fourth bridge arm, and the lower arm of the first bridge arm are turned on, and the switching circuit is turned on, the second capacitor is used to store direct current.

[0022] In some embodiments, when the upper arm of the third bridge arm, the lower arm of the fourth bridge arm, the upper arm of the first bridge arm, and the lower arm of the second bridge arm are turned on, and the switching circuit is turned off, both the first capacitor and the second capacitor are used to store DC current.

[0023] In some embodiments, the topology circuit further includes: a third switch; the first terminal of the third switch is electrically connected to the first terminal of the second bridge arm circuit, and the first terminal of the third switch is electrically connected to the first terminal of the energy storage circuit.

[0024] In some embodiments, the topology circuit further includes: a fourth switch; the first terminal of the fourth switch is electrically connected to the second terminal of the second bridge arm circuit, and the second terminal of the fourth switch is electrically connected to the second terminal of the energy storage circuit.

[0025] In some embodiments, the topology further includes: a first inductor; the first inductor is connected between the third end of the third bridge arm and the first input end of the transformer.

[0026] In some embodiments, the topology circuit further includes a third capacitor connected between the third terminal of the fourth bridge arm and the second input terminal of the transformer.

[0027] Secondly, this application provides an on-board charger, including the topology circuit provided in any of the above embodiments.

[0028] The beneficial effects of the second aspect and its possible embodiments can be referred to the first aspect, and will not be repeated here.

[0029] In some embodiments, the first terminal of the voltage conversion circuit is electrically connected to the first terminal of the topology circuit, the second terminal of the voltage conversion circuit is electrically connected to the second terminal of the topology circuit, the third terminal of the voltage conversion circuit is electrically connected to the first terminal of the AC power supply, and the fourth terminal of the voltage conversion circuit is electrically connected to the second terminal of the AC power supply; wherein, the voltage conversion circuit is used to convert the AC power output from the AC power supply into DC power and transmit the DC power to the first bridge arm circuit.

[0030] In some embodiments, the voltage conversion circuit includes: a fifth bridge arm, a sixth bridge arm, and a seventh bridge arm; the first end of the fifth bridge arm, the first end of the sixth bridge arm, and the first end of the seventh bridge arm are all first ends of the voltage conversion circuit; the second end of the fifth bridge arm, the second end of the sixth bridge arm, and the second end of the seventh bridge arm are all second ends of the voltage conversion circuit; wherein, the connection end of the upper and lower bridge arms of the fifth bridge arm is the third end of the voltage conversion circuit; the connection end of the upper and lower bridge arms of the sixth bridge arm is the third end of the voltage conversion circuit; and the connection end of the upper and lower bridge arms of the seventh bridge arm is the fourth end of the voltage conversion circuit.

[0031] In some embodiments, the vehicle charger further includes: a fourth capacitor; a first terminal of the fourth capacitor is electrically connected to a first terminal of the voltage conversion circuit, and a second terminal of the fourth capacitor is electrically connected to a second terminal of the voltage conversion circuit.

[0032] Thirdly, this application provides an electrical device including the topology circuit provided in any of the above embodiments; and / or, a vehicle charger provided in any of the embodiments.

[0033] The beneficial effects of the third aspect and its possible embodiments can be referred to the first aspect, and will not be repeated here. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1This is a schematic diagram of an existing circuit topology.

[0036] Figure 2 A schematic diagram of a topology circuit provided in an embodiment of this application;

[0037] Figure 3 A schematic diagram of another topology circuit provided in an embodiment of this application;

[0038] Figure 4 A schematic diagram of yet another topology circuit provided in an embodiment of this application;

[0039] Figure 5 A schematic diagram of a switching circuit provided in an embodiment of this application;

[0040] Figure 6 A schematic diagram of another topology circuit provided in an embodiment of this application;

[0041] Figure 7 A schematic diagram of another topology circuit provided in an embodiment of this application;

[0042] Figure 8 A schematic diagram of another topology circuit provided in an embodiment of this application;

[0043] Figure 9 A schematic diagram of a vehicle charger provided in an embodiment of this application;

[0044] Figure 10 This is a schematic diagram of an electrical device provided in an embodiment of this application.

[0045] Reference numerals: 1. First bridge arm circuit; 11. Third bridge arm; 12. Fourth bridge arm; 2. Second bridge arm circuit; 21. First bridge arm; 22. Second bridge arm; 3. Transformer; 4. Energy storage circuit; 41. First sub-circuit; 42. Second sub-circuit; 5. Switching circuit; 61. Fifth bridge arm; 62. Sixth bridge arm; 63. Seventh bridge arm; M1. First switching transistor; M2. Second switching transistor; M3. Third switching transistor; M4. Fourth switching transistor; L1. First inductor; K1. First relay; C1. First capacitor; C2. Second capacitor; C3. Third capacitor; C4. Fourth capacitor; 100. Topology circuit; 150. Voltage conversion circuit; 160. Battery pack; 200. On-board charger; 300. Electrical equipment. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0047] In the description of the invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or relative positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Unless otherwise specified, the above-mentioned orientational descriptions can be flexibly set in practical applications, provided that the relative positional relationships shown in the accompanying drawings are satisfied.

[0048] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a communication between the internal components of two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] In embodiments of the invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0051] In embodiments of the present invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in embodiments of the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0052] With the rise of the new energy vehicle industry, the industry has entered a new stage of large-scale development. Currently, high-voltage power batteries or low-voltage batteries have become the most important energy-providing components, making it crucial to charge these batteries via on-board chargers.

[0053] Existing vehicle chargers, through power factor correction circuits and resonant converters, can only meet the output requirements of a narrow voltage range and cannot achieve a wider voltage range output.

[0054] Reference Figure 1 Power factor correction (PFC) circuits are typically used to convert AC input to DC bus voltage while improving the power factor and reducing harmonics. A common PFC topology is the boost type, which outputs a relatively stable high-voltage DC, such as around 400V. This may limit the output voltage range because PFC is usually designed to maintain a fixed bus voltage, rather than an adjustable one.

[0055] Resonant converters (LLCs) are commonly used in DC-DC conversion, providing isolation and high efficiency. The advantage of LLCs lies in achieving high efficiency over a narrow input voltage range by adjusting the output voltage through switching frequency. However, their adjustment range is limited because when the input voltage varies too much, the LLC may fail to regulate effectively, leading to unstable output voltage or decreased efficiency. If the output voltage of a PFC is fixed, the LLC can only operate within a limited input range, resulting in a limited final output range. Furthermore, the design parameters of the LLC itself, such as the characteristics of the resonant cavity, may be optimized for a specific input voltage range and cannot adapt to very wide variations.

[0056] PFC typically converts AC to high-voltage DC, such as 400V, while LLC, due to its gain characteristics, can only be adjusted within a limited range when isolating and regulating voltage. For example, if the LLC's gain range is 0.8 to 1.2, then when the input is 400V, the output may be between 320V and 480V. However, if a wider output range, such as 100V to 600V, is required, such a structure cannot be achieved.

[0057] Based on this, embodiments of this application provide a topology circuit. For example... Figure 2 As shown, the topology circuit 100 includes: a first bridge arm circuit 1, a second bridge arm circuit 2, a transformer 3, and an energy storage circuit 4.

[0058] The first bridge arm circuit 1 is used to receive DC power; the second bridge arm circuit 2 is electrically connected to the first bridge arm circuit 1 through the transformer 3; the input terminal of the second bridge arm circuit 2 receives the DC power output from the first bridge arm circuit 1.

[0059] The energy storage circuit 4 is connected to the second bridge arm circuit 2. The energy storage circuit 4 is used to store DC power and charge the battery pack.

[0060] The energy storage circuit 4 includes: a first sub-circuit 41 and a second sub-circuit 42.

[0061] When the second bridge arm circuit 2 is alternately turned on, the first sub-circuit 41 and the second sub-circuit 42 alternately store DC current.

[0062] The first and second ends of the transformer are electrically connected to the first bridge arm circuit 1, and the third and fourth ends of the transformer are electrically connected to the first input terminal 201 and the second input terminal 202 of the second bridge arm circuit 2, respectively.

[0063] In other words, the first bridge arm circuit 1 transmits DC power to the transformer 3, and then through the transformer 3 to the second bridge arm circuit 2. The second bridge arm circuit 2 stores DC power for the first sub-circuit 41 in the energy storage circuit 4. Then, by switching the on and off of the first bridge arm circuit 1 and the second bridge arm circuit 2, DC power is stored for the second sub-circuit 42 in the energy storage circuit 4. In this way, the amount of DC power that can be stored will be larger than if it were all directly stored in the energy storage circuit 4, thus enabling the energy storage circuit 4 to store more DC power.

[0064] For example, the DC power received by the first bridge arm circuit 1 is 400V, while the battery pack requires a voltage of 650V. The DC power received by the first bridge arm circuit 1 is transmitted to the second bridge arm circuit 2 via the transformer 3. The gain range is generally 0.8 to 1.2. So when the input DC power is 400V, the output DC power may be in the range of 320V to 480V, and the stored DC power is also 320V to 480V. When the energy storage circuit 4 and the second bridge arm circuit 2 are alternately turned on, the DC power of 320V to 480V can be stored in the first sub-circuit 41 first, and then by switching the first bridge arm circuit 1 and the second bridge arm circuit 2 on and off, the DC power of 320V to 480V can be stored in the second sub-circuit 42. In this way, the voltage range is expanded to 640V to 960V, which meets the 650V requirement.

[0065] It should be noted that separate energy storage is also used to reduce the voltage rating of the transistors in the second bridge arm circuit, which can reduce costs and eliminate the need for transistors with higher voltage ratings.

[0066] Meanwhile, the first bridge arm circuit 1 can directly transmit DC power to the transformer 3, and then through the transformer 3 to the second bridge arm circuit 2. The second bridge arm circuit 2 directly stores DC power for all circuits (the first sub-circuit and the second sub-circuit) in the energy storage circuit 4; it is suitable for situations where the required voltage is relatively small.

[0067] For example, the DC power received by the first bridge arm circuit 1 is 400V, and the voltage required by the battery pack is 350V. The DC power received by the first bridge arm circuit 1 is transmitted to the second bridge arm circuit 2 via the transformer 3. The gain range is generally 0.8 to 1.2. So when the input DC power is 400V, the output DC power may be in the range of 320V to 480V, which meets the 350V requirement.

[0068] The specific process is as follows: the first bridge arm circuit 1 converts DC power into AC power and transmits the AC power to the transformer 3. The transformer 3 then transmits the AC power to the second bridge arm circuit 2, which in turn converts the AC power into DC power. This DC power can be the same as or different from the DC power received by the first bridge arm circuit 1.

[0069] Based on the above scheme, some embodiments of this application provide a topology circuit 100 that increases the output voltage by alternately storing electrical energy for the energy storage circuit. First, DC power is transmitted to transformer 3 through the first bridge arm circuit 1, and then transmitted to the second bridge arm circuit 2 through transformer 3. The second bridge arm circuit 2 stores DC power for the first sub-circuit 41 in the energy storage circuit 4. Then, by switching the on and off of the first bridge arm circuit 1 and the second bridge arm circuit 2, DC power is stored for the second sub-circuit 42 in the energy storage circuit 4. In this way, the amount of charge stored in the energy storage circuit 4 will be further increased, meeting the requirements of a wide voltage range.

[0070] like Figure 2 and Figure 3 As shown, the first end of the energy storage circuit 4 is electrically connected to the first output terminal 203 of the second bridge arm circuit 2, and the second end of the energy storage circuit 4 is electrically connected to the second output terminal 204 of the second bridge arm circuit 2.

[0071] When the first terminal 401 of the energy storage circuit 4 is connected to the second bridge arm circuit 2, the first sub-circuit 41 stores DC power; when the second terminal 402 of the energy storage circuit 4 is connected to the second bridge arm circuit 2, the second sub-circuit 42 stores DC power.

[0072] like Figure 2 As shown, in some embodiments, the first sub-circuit 41 includes a first capacitor C1.

[0073] The first terminal of the first capacitor C1 is the first terminal 401 of the energy storage circuit 4; the second terminal of the first capacitor C1 is the third terminal 403 of the energy storage circuit 4.

[0074] The second sub-circuit 42 includes: a second capacitor C2.

[0075] The first terminal of the second capacitor C2 is electrically connected to the second terminal of the first capacitor C1, and the second terminal of the second capacitor C2 is the second terminal 402 of the energy storage circuit 4.

[0076] Reference Figure 2 The topology circuit 100 also includes: a switching circuit 5.

[0077] The switching circuit 5 is connected between the third end of the second bridge arm 22 and the third end 403 of the energy storage circuit 4; when the second bridge arm circuit is alternately turned on, the switching circuit is used to control the first sub-circuit 41 and the second sub-circuit 42 of the energy storage circuit to alternately store DC power.

[0078] When the switching circuit 5 is on, the first bridge arm circuit 1 transmits DC power to the transformer 3, and then through the transformer 3 to the second bridge arm circuit 2. The second bridge arm circuit 2 stores DC power for the first capacitor C1 in the energy storage circuit 4. Then, by switching the first bridge arm circuit 1 and the second bridge arm circuit 2 on and off, DC power is stored for the second capacitor C2 in the energy storage circuit 4. In this way, the amount of DC power that can be stored will be larger than that of a single capacitor, thus enabling the energy storage circuit 4 to store more DC power.

[0079] like Figure 2 As shown, in some embodiments, the second bridge arm circuit 2 includes: a first bridge arm 21 and a second bridge arm 22.

[0080] The first end of the first bridge arm 21 is the first output terminal 203 of the second bridge arm circuit 2, and the second end of the first bridge arm 21 is the second output terminal 204 of the second bridge arm circuit 2.

[0081] The third end of the first bridge arm 21 is electrically connected to the first output end of the transformer 3; the first end of the second bridge arm 22 is the first output end of the second bridge arm circuit 2, and the second end of the second bridge arm 22 is the second output end of the second bridge arm circuit 2; the third end of the second bridge arm 22 is electrically connected to the second output end of the transformer 3, and is also electrically connected to the first end 501 of the switch circuit 5.

[0082] The connection end between the upper and lower bridge arms of the first bridge arm 21 is the third end of the first bridge arm 21; the connection end between the upper and lower bridge arms of the second bridge arm 22 is the third end of the second bridge arm 22.

[0083] In some embodiments, the upper and lower arms of the first bridge arm 21 are both MOSFETs, and the upper and lower arms of the second bridge arm 22 are also both MOSFETs.

[0084] When the switching circuit 5 is on, the first bridge arm circuit 1 transmits DC power to the transformer 3, and then through the transformer 3 to the second bridge arm circuit 2. The second bridge arm circuit 2 stores DC power for the first capacitor C1 in the energy storage circuit 4. Then, by switching the on and off of the first bridge arm circuit 1 and the second bridge arm circuit 2, DC power is stored for the second capacitor C2 in the energy storage circuit 4. In this way, the amount of DC power that could be stored is increased compared to a single capacitor, allowing the energy storage circuit 4 to store more DC power. Furthermore, separate energy storage allows the upper and lower bridge arms of the first bridge arm 21 and the upper and lower bridge arms of the second bridge arm 22 to use lower voltage MOSFETs instead of high voltage MOSFETs, thereby further reducing costs.

[0085] like Figure 2 As shown, in some embodiments, the switching circuit 5 includes a first relay K1.

[0086] The first terminal of the first relay K1 is the first terminal 501 of the switching circuit 5, and the second terminal of the first relay K1 is the second terminal 502 of the switching circuit 5.

[0087] Reference Figure 2 and Figure 3 In some embodiments, when the upper bridge arm of the first bridge arm 21 is turned on and the first relay K1 is closed, the first capacitor C1 is used to store DC power; or, when the lower bridge arm of the first bridge arm 21 is turned on and the first relay K1 is closed, the second capacitor C2 is used to store DC power.

[0088] In other words, when the first relay K1 is closed, the first bridge arm circuit 1 transmits DC power to the transformer 3, and then through the transformer 3 to the second bridge arm circuit 2. The upper bridge arm of the first bridge arm 21 in the second bridge arm circuit 2 is turned on, and the second bridge arm circuit 2 stores DC power for the first capacitor C1 in the energy storage circuit 4. Then, by switching the on and off of the first bridge arm circuit 1 and the second bridge arm circuit 2, the lower bridge arm of the first bridge arm 21 in the second bridge arm circuit 2 is turned on, storing DC power for the second capacitor C2 in the energy storage circuit 4. In this way, the amount of DC power that can be stored will be larger than that of the existing technology with only one capacitor, thus enabling the energy storage circuit 4 to store more DC power.

[0089] Reference Figure 4 In some embodiments, when the upper arm of the first bridge arm 21 and the lower arm of the second bridge arm 22 are turned on and the first relay K1 is turned off, the first capacitor C1 and the second capacitor C2 are both used to store DC power.

[0090] When the first relay K1 is disconnected, the first bridge arm circuit 1 transmits DC power to the transformer 3, and then through the transformer 3 to the second bridge arm circuit 2. The upper bridge arm of the first bridge arm 21 and the lower bridge arm of the second bridge arm 22 in the second bridge arm circuit 2 are turned on, so as to store DC power for the first capacitor C1 and the second capacitor C2 in the energy storage circuit 4.

[0091] Reference Figure 5 In some embodiments, the switching circuit 5 further includes a first switching transistor M1 and a second switching transistor M2.

[0092] The first terminal of the first switching transistor M1 is the first terminal 501 of the switching circuit 5. The second terminal of the first switching transistor M1 is electrically connected to the second terminal of the second switching transistor M2. The first terminal of the second switching transistor M2 is the second terminal 502 of the switching circuit 5.

[0093] In some embodiments, when the upper bridge arm of the first bridge arm 21 is turned on and the first switch M1 and the second switch M2 are turned on, the first capacitor C1 is used to store DC power; or, when the lower bridge arm of the first bridge arm 21 is turned on and the first switch M1 and the second switch M2 are turned on, the second capacitor C2 is used to store DC power.

[0094] In other words, when the first switch M1 and the second switch M2 are closed, the first bridge arm circuit 1 transmits DC power to the transformer 3, and then through the transformer 3 to the second bridge arm circuit 2. The upper bridge arm of the first bridge arm 21 in the second bridge arm circuit 2 is turned on, and the second bridge arm circuit 2 stores DC power for the first capacitor C1 in the energy storage circuit 4. Then, by switching the first bridge arm circuit 1 and the second bridge arm circuit 2 on and off, the lower bridge arm of the first bridge arm 21 in the second bridge arm circuit 2 is turned on, storing DC power for the second capacitor C2 in the energy storage circuit 4. In this way, the amount of DC power that can be stored will be larger than that of the existing technology with only one capacitor, thus enabling the energy storage circuit 4 to store more DC power.

[0095] Among them, the first switch M1 and the second switch M2 are smaller in size, which further improves the integration of the vehicle charger.

[0096] In some embodiments, the first switch M1 and the second switch M2 are both MOSFETs.

[0097] Reference Figure 6 In some embodiments, when the upper arm of the first bridge arm 21 and the lower arm of the second bridge arm 22 are turned on, and the first switch M1 and the second switch M2 are turned off, the first capacitor C1 and the second capacitor C2 are both used to store DC power.

[0098] When the first switch M1 and the second switch M2 are disconnected, the first bridge arm circuit 1 transmits DC power to the transformer 3, and then through the transformer 3 to the second bridge arm circuit 2. The upper bridge arm of the first bridge arm 21 and the lower bridge arm of the second bridge arm 22 in the second bridge arm circuit 2 are turned on, so as to store DC power for the first capacitor C1 and the second capacitor C2 in the energy storage circuit 4.

[0099] Reference Figure 2 In some embodiments, the first bridge arm circuit 1 includes a third bridge arm 11 and a fourth bridge arm 12.

[0100] The first end of the third bridge arm 11 is electrically connected to the first end of the voltage conversion circuit 150, and the second end of the third bridge arm 11 is electrically connected to the second end of the voltage conversion circuit 150; the third end of the third bridge arm 11 is electrically connected to the first input end of the transformer 3; the first end of the fourth bridge arm 12 is electrically connected to the first end of the voltage conversion circuit 150, and the second end of the fourth bridge arm 12 is electrically connected to the second end of the voltage conversion circuit 150; the third end of the fourth bridge arm 12 is electrically connected to the second input end of the transformer 3; wherein, the connection end between the upper and lower bridge arms of the third bridge arm 11 is the third end of the third bridge arm 11; the connection end between the upper and lower bridge arms of the fourth bridge arm 12 is the third end of the fourth bridge arm 12.

[0101] Reference Figure 3 In some embodiments, when the upper arm of the third bridge arm 11, the lower arm of the fourth bridge arm 12, and the upper arm of the first bridge arm 21 are turned on, and the switching circuit 5 is turned on, the first capacitor C1 is used to store DC power; or, when the lower arm of the third bridge arm 11, the upper arm of the fourth bridge arm 12, and the lower arm of the first bridge arm 21 are turned on, and the switching circuit 5 is turned on, the second capacitor C2 is used to store DC power.

[0102] In other words, when the switching circuit 5 is on (the first switching transistor M1 and the second switching transistor M2 are closed, or the first relay K1 is closed), the upper arm of the third arm 11 and the lower arm of the fourth arm 12 of the first bridge arm circuit 1 are on. The first bridge arm circuit 1 transmits DC power to the transformer 3, and then through the transformer 3 to the second bridge arm circuit 2. The upper arm of the first arm 21 in the second bridge arm circuit 2 is on, and the second bridge arm circuit 2 stores DC power for the first capacitor C1 in the energy storage circuit 4. Then, by switching the on and off of the first bridge arm circuit 1 and the second bridge arm circuit 2, the lower arm of the third arm 11 and the upper arm of the fourth arm 12 in the first bridge arm circuit 1 are on, and the lower arm of the first arm 21 in the second bridge arm circuit 2 is on, storing DC power for the second capacitor C2 in the energy storage circuit 4. In this way, the amount of DC power that can be stored will be larger than that of the existing technology with only one capacitor, thus enabling the energy storage circuit 4 to store more DC power.

[0103] In some embodiments, when the upper arm of the third bridge arm 11, the lower arm of the fourth bridge arm 12, the upper arm of the first bridge arm 21, and the lower arm of the second bridge arm 22 are conducting and the switching circuit 5 is disconnected, the first capacitor C1 and the second capacitor C2 are both used to store DC power.

[0104] like Figure 7 and Figure 8 As shown, in some embodiments, the topology circuit 100 further includes: a third switch M3; the first end of the third switch M3 is electrically connected to the first end of the second bridge arm circuit 2, and the first end of the third switch M3 is electrically connected to the first end of the energy storage circuit 4.

[0105] In some embodiments, the topology circuit 100 further includes: a fourth switch M4; the first end of the fourth switch M4 is electrically connected to the second end of the second bridge arm circuit 2, and the second end of the fourth switch M4 is electrically connected to the second end of the energy storage circuit 4.

[0106] Among them, the third switch M3 and the fourth switch M4 play the role of voltage divider, which allows the devices in the upper and lower bridge arms of the second bridge arm circuit 2 to be replaced with MOSFETs with lower voltage ratings, thereby reducing costs.

[0107] like Figure 7 As shown, in some embodiments, the topology circuit 100 further includes: a first inductor L1; the first inductor L1 is connected between the third end of the third bridge arm 11 and the first input end of the transformer 3.

[0108] In some embodiments, the topology circuit 100 further includes a third capacitor C3.

[0109] The third capacitor C3 is connected between the third terminal of the fourth bridge arm 12 and the second input terminal of the transformer 3.

[0110] like Figure 9 As shown, this application provides an on-board charger 200, including a topology circuit 100 and a voltage conversion circuit 150.

[0111] The first terminal of the voltage conversion circuit 150 is electrically connected to the first terminal of the topology circuit 100, the second terminal of the voltage conversion circuit 150 is electrically connected to the second terminal of the topology circuit 100, the third terminal of the voltage conversion circuit 150 is electrically connected to the first terminal of the AC power supply, and the fourth terminal of the voltage conversion circuit 150 is electrically connected to the second terminal of the AC power supply.

[0112] The voltage conversion circuit 150 is used to convert the AC power output from the AC power source into DC power and transmit the DC power to the first bridge arm circuit 1.

[0113] In some embodiments, the voltage conversion circuit 150 includes a fifth bridge arm 61, a sixth bridge arm 62, and a seventh bridge arm 63.

[0114] The first end of the fifth bridge arm 61, the first end of the sixth bridge arm 62, and the first end of the seventh bridge arm 63 are all the first ends of the voltage conversion circuit 150; the second ends of the fifth bridge arm 61, the second ends of the sixth bridge arm 62, and the second ends of the seventh bridge arm 63 are all the second ends of the voltage conversion circuit 150; wherein, the connection end between the upper and lower bridge arms of the fifth bridge arm 61 is the third end of the voltage conversion circuit 150; the connection end between the upper and lower bridge arms of the sixth bridge arm 62 is the third end of the voltage conversion circuit 150; and the connection end between the upper and lower bridge arms of the seventh bridge arm 63 is the fourth end of the voltage conversion circuit 150.

[0115] In some embodiments, the vehicle charger 200 further includes a fourth capacitor C4.

[0116] The first terminal of the fourth capacitor C4 is electrically connected to the first terminal of the voltage conversion circuit 150, and the second terminal of the fourth capacitor C4 is electrically connected to the second terminal of the voltage conversion circuit 150.

[0117] The fourth capacitor C4 serves as an energy storage device, allowing the DC power obtained from the voltage conversion circuit 150 to be stored in the fourth capacitor C4.

[0118] like Figure 10 As shown, this application provides an electrical device 300, including the topology circuit 100 provided in any of the above embodiments; and / or, the vehicle charger 200 provided in any of the embodiments.

[0119] In some embodiments, the electrical equipment 300 is a vehicle.

[0120] The on-board charger 200 in the tram increases the output voltage by adding a switching circuit 5. First, DC power is transmitted to transformer 3 through the first bridge arm circuit 1, and then to the second bridge arm circuit 2 through transformer 3. The second bridge arm circuit 2 stores DC power for a part of the energy storage circuit 4. Then, by switching the on and off of the first bridge arm circuit 1 and the second bridge arm circuit 2, DC power is stored for another part of the energy storage circuit 4. In this way, the amount of charge stored in the energy storage circuit 4 will be further increased to meet the wide voltage requirements.

[0121] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0122] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A topology circuit (100), characterized in that, include: The first bridge arm circuit (1) is used to receive DC power; The second bridge arm circuit (2) is electrically connected to the first bridge arm circuit (1) through a transformer (3); the input terminal of the second bridge arm circuit (2) receives DC power output from the first bridge arm circuit (1); Energy storage circuit (4), which is connected to the second bridge arm circuit (2), is used to store the DC power and charge the battery pack; The energy storage circuit (4) includes a first sub-circuit (41) and a second sub-circuit (42); when the second bridge arm circuit (2) is alternately turned on, the first sub-circuit (41) and the second sub-circuit (42) alternately store the DC power.

2. The topology circuit (100) according to claim 1, characterized in that, The first end of the energy storage circuit (4) is electrically connected to the first output end (203) of the second bridge arm circuit (2), and the second end of the energy storage circuit (4) is electrically connected to the second output end (204) of the second bridge arm circuit (2). When the first terminal (401) of the energy storage circuit (4) is connected to the second bridge arm circuit (2), the first sub-circuit (41) stores the DC power. When the second terminal (402) of the energy storage circuit (4) is connected to the second bridge arm circuit (2), the second sub-circuit (42) stores the DC power.

3. The topology circuit (100) according to claim 2, characterized in that, The first sub-circuit (41) includes: a first capacitor (C1); The first terminal of the first capacitor (C1) is the first terminal (401) of the energy storage circuit (4); the second terminal of the first capacitor (C1) is the third terminal (403) of the energy storage circuit (4).

4. The topology circuit (100) according to claim 3, characterized in that, The second sub-circuit (42) includes: a second capacitor (C2); The first end of the second capacitor (C2) is electrically connected to the second end of the first capacitor (C1), and the second end of the second capacitor (C2) is the second end (402) of the energy storage circuit (4).

5. The topology circuit (100) according to claim 4, characterized in that, The second bridge arm circuit (2) includes: a first bridge arm (21) and a second bridge arm (22); The first end of the first bridge arm (21) is the first output terminal (203) of the second bridge arm circuit (2), and the second end of the first bridge arm (21) is the second output terminal (204) of the second bridge arm circuit (2); the third end of the first bridge arm (21) is electrically connected to the first output terminal of the transformer (3); The first end of the second bridge arm (22) is the first output terminal (203) of the second bridge arm circuit (2), and the second end of the second bridge arm (22) is the second output terminal (204) of the second bridge arm circuit (2); the third end of the second bridge arm (22) is electrically connected to the second output terminal of the transformer (3); Wherein, the connection end of the upper bridge arm and the lower bridge arm of the first bridge arm (21) is the third end of the first bridge arm (21); the connection end of the upper bridge arm and the lower bridge arm of the second bridge arm (22) is the third end of the second bridge arm (22).

6. The topology circuit (100) according to claim 5, characterized in that, The topology circuit (100) further includes: a switching circuit (5); the switching circuit (5) is connected between the third end of the second bridge arm (22) and the third end (403) of the energy storage circuit (4); When the second bridge arm circuit (2) is alternately turned on, the switching circuit (5) is used to control the first sub-circuit (41) and the second sub-circuit (42) of the energy storage circuit (4) to alternately store the DC power.

7. The topology circuit (100) according to claim 6, characterized in that, The switching circuit (5) includes: a first relay (K1); The first terminal of the first relay (K1) is the first terminal (501) of the switching circuit (5), and the second terminal of the first relay (K1) is the second terminal (502) of the switching circuit (5).

8. The topology circuit (100) according to claim 7, characterized in that, When the upper arm of the first bridge arm (21) is turned on and the first relay (K1) is closed, the first capacitor (C1) is used to store the DC current; or, When the lower arm of the first bridge arm (21) is turned on and the first relay (K1) is closed, the second capacitor (C2) is used to store the DC current.

9. The topology circuit (100) according to claim 7, characterized in that, When the upper arm of the first bridge arm (21) and the lower arm of the second bridge arm (22) are turned on, and the first relay (K1) is turned off, both the first capacitor (C1) and the second capacitor (C2) are used to store the DC current.

10. The topology circuit (100) according to claim 6, characterized in that, The switching circuit (5) further includes: a first switching transistor (M1) and a second switching transistor (M2); The first terminal of the first switch transistor (M1) is the first terminal (501) of the switch circuit (5), the second terminal of the first switch transistor (M1) is electrically connected to the second terminal of the second switch transistor (M2), and the first terminal of the second switch transistor (M2) is the second terminal (502) of the switch circuit (5).

11. The topology circuit (100) according to claim 10, characterized in that, When the upper arm of the first bridge arm (21) is turned on, and the first switch (M1) and the second switch (M2) are turned on, the first capacitor (C1) is used to store the DC current; or, When the lower arm of the first bridge arm (21) is turned on, and the first switch (M1) and the second switch (M2) are turned on, the second capacitor (C2) is used to store the DC current.

12. The topology circuit (100) according to claim 10, characterized in that, When the upper arm of the first bridge arm (21) and the lower arm of the second bridge arm (22) are turned on, and the first switch (M1) and the second switch (M2) are turned off, the first capacitor (C1) and the second capacitor (C2) are both used to store the DC current.

13. The topology circuit (100) according to claim 6, characterized in that, The first bridge arm circuit (1) includes: a third bridge arm (11) and a fourth bridge arm (12); The first end of the third bridge arm (11) is used to be electrically connected to the first end of the voltage conversion circuit (150), and the second end of the third bridge arm (11) is used to be electrically connected to the second end of the voltage conversion circuit (150); the third end of the third bridge arm (11) is electrically connected to the first input end of the transformer (3); The first end of the fourth bridge arm (12) is used to be electrically connected to the first end of the voltage conversion circuit (150), the second end of the fourth bridge arm (12) is used to be electrically connected to the second end of the voltage conversion circuit (150), and the third end of the fourth bridge arm (12) is electrically connected to the second input end of the transformer (3). Wherein, the connection end of the upper bridge arm and the lower bridge arm of the third bridge arm (11) is the third end of the third bridge arm (11); the connection end of the upper bridge arm and the lower bridge arm of the fourth bridge arm (12) is the third end of the fourth bridge arm (12).

14. The topology circuit (100) according to claim 13, characterized in that, When the upper arm of the third bridge arm (11), the lower arm of the fourth bridge arm (12), and the upper arm of the first bridge arm (21) are turned on, and the switching circuit (5) is turned on, the first capacitor (C1) is used to store the DC current; or, When the lower arm of the third bridge arm (11), the upper arm of the fourth bridge arm (12), and the lower arm of the first bridge arm (21) are turned on, and the switching circuit (5) is turned on, the second capacitor (C2) is used to store the DC current.

15. The topology circuit (100) according to claim 13, characterized in that, When the upper arm of the third bridge arm (11), the lower arm of the fourth bridge arm (12), the upper arm of the first bridge arm (21), and the lower arm of the second bridge arm (22) are turned on, and the switching circuit (5) is turned off, the first capacitor (C1) and the second capacitor (C2) are both used to store the DC current.

16. The topology circuit (100) according to any one of claims 1 to 15, characterized in that, The topology circuit (100) also includes: a third switching transistor (M3); The first end of the third switch (M3) is electrically connected to the first end of the second bridge arm circuit (2), and the first end of the third switch (M3) is electrically connected to the first end of the energy storage circuit (4).

17. The topology circuit (100) according to claim 16, characterized in that, The topology circuit (100) also includes: a fourth switching transistor (M4); The first end of the fourth switch (M4) is electrically connected to the second end of the second bridge arm circuit (2), and the second end of the fourth switch (M4) is electrically connected to the second end of the energy storage circuit (4).

18. The topology circuit (100) according to claim 11, characterized in that, The topology circuit (100) further includes: a first inductor (L1); The first inductor (L1) is connected between the third end of the third bridge arm (11) and the first input end of the transformer (3).

19. The topology circuit (100) according to claim 18, characterized in that, The topology circuit (100) also includes: a third capacitor (C3); The third capacitor (C3) is connected between the third end of the fourth bridge arm (12) and the second input end of the transformer (3).

20. A vehicle charger (200), characterized in that, include: The topology circuit (100) and voltage conversion circuit (150) as described in any one of claims 1 to 18.

21. The vehicle charger (200) according to claim 20, characterized in that, The first terminal of the voltage conversion circuit (150) is electrically connected to the first terminal of the topology circuit (100); the second terminal of the voltage conversion circuit (150) is electrically connected to the second terminal of the topology circuit (100); the third terminal of the voltage conversion circuit (150) is electrically connected to the first terminal of the AC power supply; and the fourth terminal of the voltage conversion circuit (150) is electrically connected to the second terminal of the AC power supply. The voltage conversion circuit (150) is used to convert the AC power output from the AC power source into DC power and transmit the DC power to the first bridge arm circuit (1).

22. The vehicle charger (200) according to claim 21, characterized in that, The voltage conversion circuit (150) includes: a fifth bridge arm (61), a sixth bridge arm (62), and a seventh bridge arm (63); The first end of the fifth bridge arm (61), the first end of the sixth bridge arm (62), and the first end of the seventh bridge arm (63) are all the first ends of the voltage conversion circuit (150); The second end of the fifth bridge arm (61), the second end of the sixth bridge arm (62), and the second end of the seventh bridge arm (63) are all the second ends of the voltage conversion circuit (150); The upper and lower bridge arms of the fifth bridge arm (61) are connected to the third terminal of the voltage conversion circuit (150); the upper and lower bridge arms of the sixth bridge arm (62) are connected to the third terminal of the voltage conversion circuit (150); and the upper and lower bridge arms of the seventh bridge arm (63) are connected to the fourth terminal of the voltage conversion circuit (150).

23. The vehicle charger (200) according to any one of claims 20 to 22, characterized in that, The vehicle charger (200) also includes: a fourth capacitor (C4); The first terminal of the fourth capacitor (C4) is electrically connected to the first terminal of the voltage conversion circuit (150), and the second terminal of the fourth capacitor (C4) is electrically connected to the second terminal of the voltage conversion circuit (150).

24. An electrical appliance (300), characterized in that, The topology circuit (100) includes any one of claims 1 to 19; and / or, any one of claims 20 to 23, the vehicle charger (200).

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