Charging circuit, charging device and charging system

Abstract

The invention provides a charging circuit, charging equipment and a charging system, the charging circuit comprises a phase-shifting transformer, the phase-shifting transformer is provided with a plurality of groups of secondary windings, each group of secondary windings comprises a plurality of phase-shifting secondary windings, and each phase-shifting secondary winding is used for outputting an AC voltage signal to enable each group of secondary windings to output a plurality of AC voltage signals; and each group of secondary windings is electrically connected with at least one alternating current-direct current conversion circuit in the alternating current-direct current conversion circuits, and each alternating current-direct current conversion circuit is electrically connected with a plurality of phase-shifting secondary windings of one group of secondary windings in the phase-shifting transformer. The charging gun heads of the charging circuit meet the electrical isolation requirement through the phase-shifting transformer, a direct-current isolation circuit and a power factor correction circuit do not need to be arranged, components of the charging circuit can be reduced, and the power conversion efficiency of the charging circuit can be improved.

Description

Technical Field

[0001] The present application relates to the field of charging technology, and in particular to a charging circuit, a charging device and a charging system. Background Art

[0002] At present, electric vehicle charging and swapping stations need to convert AC power into DC power in order to facilitate DC charging of replacement batteries or electric vehicles. For example, the traditional charging system needs to step down the voltage to 380V AC voltage signal through an industrial frequency transformer, and then convert the 380V AC voltage signal into a DC voltage signal through an AC conversion module.

[0003] However, in order to make the power factor of the power supply system close to 1, the AC conversion module must be equipped with a power factor correction circuit (such as a PFC circuit). At the same time, since voltage isolation needs to be achieved between different charging guns, the AC conversion module must also be equipped with a DC isolation circuit. This will lead to an increase in the components of the charging equipment and an increase in manufacturing costs, and it will be difficult to improve the power conversion efficiency of the charging equipment. Summary of the invention

[0004] The present application provides a charging circuit, a charging device and a charging system, aiming to solve the technical problem that the current charging circuit uses an industrial frequency transformer, which leads to increased manufacturing costs.

[0005] In a first aspect, the present application provides a charging circuit, comprising:

[0006] A phase-shifting transformer, wherein the phase-shifting transformer has multiple groups of secondary windings, each group of secondary windings includes multiple phase-shifting secondary windings, and each phase-shifting secondary winding is used to output an AC voltage signal, so that each group of secondary windings outputs multiple AC voltage signals;

[0007] A plurality of AC-DC conversion circuits, each group of secondary windings being electrically connected to at least one of the plurality of AC-DC conversion circuits, each AC-DC conversion circuit being electrically connected to a plurality of phase-shifted secondary windings of a group of secondary windings in a phase-shifting transformer, each AC-DC conversion circuit being used to convert a plurality of AC voltage signals corresponding to each AC-DC conversion circuit into a first DC voltage signal;

[0008] The phases of the AC voltage signals output by at least two phase-shifted secondary windings in each group of secondary windings are not equal.

[0009] In some embodiments, each AC-DC conversion circuit includes a plurality of sub-conversion circuits, and the plurality of sub-conversion circuits correspond one-to-one to a plurality of phase-shifted secondary windings in a group of secondary windings corresponding to each AC-DC conversion circuit;

[0010] Each sub-conversion circuit is used to convert the AC voltage signal output by the phase-shifted secondary winding corresponding to each sub-conversion circuit into a second DC voltage signal.

[0011] In some embodiments, each sub-conversion circuit includes a rectifier circuit;

[0012] The rectifier circuit is used to convert the AC voltage signal received by the rectifier circuit into a third DC voltage signal.

[0013] In some embodiments, each sub-conversion circuit further includes a filtering circuit;

[0014] The input end of the filter circuit is electrically connected to the input end of the sub-conversion circuit corresponding to the filter circuit, and the filter circuit is used to filter the AC voltage signal received by the sub-conversion circuit corresponding to the filter circuit.

[0015] In some embodiments, each sub-conversion circuit further includes a voltage changing circuit;

[0016] An input end of the voltage changing circuit is electrically connected to an output end of the rectifying circuit, and the voltage changing circuit is used to step up or step down the third DC voltage signal.

[0017] In some embodiments, the voltage changing circuit includes a first inductor, a first diode, and a first switch;

[0018] One end of the first inductor is electrically connected to the first output end of the rectifier circuit, and the other end of the first inductor is electrically connected to the anode of the first diode;

[0019] The first end of the first switch is connected to a first node between the first inductor and the first diode, and the second end of the first switch is electrically connected to the second output end of the rectifier circuit.

[0020] In some embodiments, the voltage changing circuit further includes a second inductor, a second diode, and a second switch;

[0021] One end of the second inductor is electrically connected to the first output end of the rectifier circuit, and the other end of the second inductor is electrically connected to the anode of the second diode, and the cathode of the second diode is electrically connected to the cathode of the first diode;

[0022] A first end of the second switch is connected to a second node between the second inductor and the second diode, and a second end of the second switch is electrically connected to a second output end of the rectifier circuit.

[0023] In some embodiments, the voltage changing circuit includes a third inductor, a third diode, and a third switch;

[0024] A first end of the third switch is electrically connected to the first output end of the rectifier circuit, and a second end of the third switch is electrically connected to one end of the third inductor;

[0025] An anode of the third diode is electrically connected to the second output terminal of the rectifier circuit, and a cathode of the third diode is connected to a third node between the third switch and the third inductor.

[0026] In some embodiments, the voltage changing circuit includes a fourth inductor, a fourth diode, and a fourth switch;

[0027] A first end of the fourth switch is electrically connected to the first output end of the rectifier circuit, a second end of the fourth switch is electrically connected to one end of the fourth inductor, and the other end of the fourth inductor is electrically connected to the other end of the third inductor;

[0028] An anode of the fourth diode is electrically connected to the second output end of the rectifier circuit, and a cathode of the fourth diode is connected to a fourth node between the fourth switch and the fourth inductor.

[0029] In some embodiments, output terminals of multiple sub-conversion circuits of each AC-DC conversion circuit are connected in series or in parallel to generate a first DC voltage signal from multiple second DC voltage signals output by the multiple sub-conversion circuits.

[0030] In some embodiments, each AC-DC conversion circuit further includes a voltage regulating circuit;

[0031] The voltage regulating circuit is electrically connected to output ends of a plurality of sub-conversion circuits of the AC-DC conversion circuit corresponding to the voltage regulating circuit, and the voltage regulating circuit is used for adjusting the voltage of the first DC voltage signal.

[0032] In some embodiments, the multiple AC voltage signals output by at least two groups of secondary windings among the multiple groups of secondary windings correspond to each other one by one and have equal phases.

[0033] In some embodiments, the charging circuit further includes a plurality of switching circuits;

[0034] The plurality of switching circuits correspond to the plurality of AC-DC conversion circuits one by one, and each switching circuit includes a first switching switch and a second switching switch;

[0035] The first end of the first switching switch is electrically connected to the output end of the AC-DC conversion circuit corresponding to the first switching switch, and the first switching switch is used to turn on the power supply line of the charging circuit to provide electric energy to the first charging object; the first end of the second switching switch is electrically connected to the output end of the AC-DC conversion circuit corresponding to the second switching switch, and the second switching switch is used to turn on the power supply line of the charging circuit to provide electric energy to the second charging object.

[0036] In some embodiments, each set of secondary windings includes a first charging output terminal, and the first charging output terminal is used to connect to a second charging object to provide electrical energy to the second charging object;

[0037] The second ends of the plurality of second switching switches corresponding to each group of secondary windings are connected in parallel and electrically connected to the same first charging output end.

[0038] In some embodiments, at least two groups of secondary windings among the multiple groups of secondary windings correspond to the same second charging output terminal, and the second charging output terminal is used to connect to a second charging object and provide electrical energy to the second charging object;

[0039] The second ends of the plurality of second switching switches corresponding to at least two groups of secondary windings are connected in parallel and electrically connected to the same second charging output end.

[0040] In a second aspect, the present application provides a charging system, comprising the charging circuit as described in the first aspect.

[0041] In a third aspect, the present application provides a charging device, comprising the charging circuit as described in the first aspect.

[0042] The present application uses a phase-shifting transformer to step down the AC voltage signal. Since the phase-shifting transformer can not only isolate and step down the voltage, but also suppress the input current harmonics, there is no need to set up a power factor correction circuit in the charging circuit. At the same time, since the phase-shifting transformer has multiple groups of secondary windings, and each group of secondary windings includes multiple phase-shifted secondary windings, the AC-DC conversion circuit can be used to convert the multiple AC voltage signals output by the corresponding secondary windings into DC voltage signals, so that each group of secondary windings is electrically isolated and suspended from the ground. Therefore, each group of secondary windings can be corresponded to a charging gun, so that the charging gun heads of the charging circuit meet the charging standard requirements of electrical isolation and suspension from the ground, and thus the charging circuit does not need to be provided with a DC isolation circuit, ultimately achieving the purpose of reducing the components of the charging circuit and improving the power conversion efficiency of the charging circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 is a circuit structure diagram of a charging circuit provided in an embodiment of the present application;

[0045] Figure 2 is a circuit structure diagram of another charging circuit provided in an embodiment of the present application;

[0046] Figure 3 is a circuit structure diagram of another charging circuit provided in an embodiment of the present application;

[0047] Figure 4 is a circuit structure diagram of another charging circuit provided in an embodiment of the present application;

[0048] Figure 5 1 is a schematic diagram of a circuit structure of an AC-DC conversion circuit provided in an embodiment of the present application;

[0049] Figure 6 is a schematic diagram of a circuit structure of a sub-conversion circuit provided in an embodiment of the present application;

[0050] Figure 7 is a circuit structure diagram of another sub-conversion circuit provided in an embodiment of the present application;

[0051] Figure 8 is a circuit structure diagram of another sub-conversion circuit provided in an embodiment of the present application;

[0052] Fig. 9 is a circuit structure diagram of another sub-conversion circuit provided in an embodiment of the present application;

[0053] Fig.10 It is a circuit diagram of a charging circuit connected to a charging object provided in an embodiment of the present application;

[0054] Fig.11 It is a circuit diagram of another charging circuit provided in an embodiment of the present application connected to a charging object.

[0055] Among them, a phase-shifting transformer 10, a secondary winding 11, a phase-shifting secondary winding 111, an AC-DC conversion circuit 20, a sub-conversion circuit 21, a filter circuit 211, a rectifier circuit 212, a voltage change circuit 213, a voltage regulation circuit 22, an output filter circuit 23, a switching circuit 30, a first charging object 40, and a second charging object 50;

[0056] A first inductor L1, a first diode D1, a first switch S1, a second inductor L2, a second diode D2, a second switch S2, a third inductor L3, a third diode D3, a third switch S3, a fourth inductor L4, a fourth diode D4, a fourth switch S4, a first switching switch S01, and a second switching switch S02;

[0057] The first node M1, the second node M2, the third node M3, and the fourth node M4. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0059] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0060] In this application, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is given to enable any person skilled in the art to implement and use the invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the invention can be implemented without using these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the invention with unnecessary details. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in this application.

[0061] The embodiments of the present application provide a charging circuit, a charging device, and a charging system, which are described in detail below.

[0062] First, see Figure 1 , Figure 1 A circuit structure schematic diagram of a charging circuit in an embodiment of the present application is shown, wherein the charging circuit comprises:

[0063] A phase-shifting transformer 10, the phase-shifting transformer 10 has a plurality of secondary windings 11, each of which includes a plurality of phase-shifting secondary windings 111, each of which is used to output an AC voltage signal, so that each of which outputs a plurality of AC voltage signals.

[0064] A plurality of AC-DC conversion circuits 20, each group of secondary windings 11 is electrically connected to at least one AC-DC conversion circuit 20 among the plurality of AC-DC conversion circuits 20, each AC-DC conversion circuit 20 is electrically connected to a plurality of phase-shifted secondary windings 111 of a group of secondary windings 11 in the phase-shifting transformer 10, and the AC-DC conversion circuit 20 is used to convert a plurality of AC voltage signals corresponding to each AC-DC conversion circuit 20 into a first DC voltage signal;

[0065] The phases of the AC voltage signals output by at least two phase-shifted secondary windings 111 in each group of secondary windings 11 are not equal.

[0066] Specifically, the phase-shifting transformer 10 has a primary winding and a secondary winding, the primary winding is used to access the AC input voltage (such as a grid voltage signal), and the secondary winding generates an AC output voltage that is isolated from the AC input voltage and stepped down. Among them, the secondary winding is equally divided into multiple groups of secondary windings 11, each group of secondary windings 11 can correspond to a charging object / charging interface (such as a charging gun), and since each group of secondary windings 11 is isolated from each other, the requirement of electrical isolation between charging interfaces can be met. Each group of secondary windings 11 can correspond to a charging object / charging interface, or at least two groups of secondary windings 11 can correspond to the same charging object / charging interface.

[0067] Exemplarily, the phase-shifting transformer 10 may be a direct phase-shifting transformer, an indirect phase-shifting transformer, an asymmetric phase-shifting transformer 10 or a symmetric phase-shifting transformer.

[0068] More specifically, each set of secondary windings 11 includes a plurality of phase-shifted secondary windings 111, each phase-shifted secondary winding 111 is used to output an AC voltage signal, and the phases of the AC voltage signals output by at least two phase-shifted secondary windings 111 in each set of secondary windings 11 are not equal. Figure 1 As shown, the phase-shifting transformer 10 has two sets of secondary windings 11 , each set of secondary windings 11 includes four phase-shifting secondary windings 111 , and the phases of the AC voltage signals output by the four phase-shifting secondary windings 111 are shifted by 0°, 15°, 30° and -15° respectively.

[0069] It can be understood that the number of secondary windings 11 of the phase-shifting transformer 10 can also be more groups to adapt to a larger number of charging guns; or, the number of phase-shifted secondary windings 111 of each group of secondary windings 11 can also be 2, 3, 4, 5 or other numbers, and the phases of the AC voltage signals output by the multiple phase-shifted secondary windings 111 are respectively offset by other different angles, and the phases of the AC voltage signals output by the multiple phase-shifted secondary windings 111 in each group of secondary windings 11 can be set according to actual conditions, such as 10°, 20°, 30°, etc. The phase difference between the AC voltage signals output by the multiple phase-shifted secondary windings 111 in each group of secondary windings 11 can be set according to actual conditions, such as 5°, 10°, 15°, 12°, 30°, 60°, 120°, 45°, etc.

[0070] The AC-DC conversion circuit 20 is used to convert multiple AC voltage signals output by each group of secondary windings of the phase-shifting transformer 10 into a first DC voltage signal to provide DC power to a charging object (such as a battery or an electric vehicle). Generally, the AC-DC conversion circuit 20 may include a rectifier, a filter, a voltage regulator, and a voltage stabilization circuit to convert the AC voltage signal into a DC voltage signal. For example, the AC voltage signal may be rectified by half-wave rectification, full-wave rectification, or bridge rectification.

[0071] In the embodiment of the present application, the present application steps down the AC voltage signal through the phase-shifting transformer 10. Since the phase-shifting transformer 10 can not only play the role of isolation and voltage reduction, but also play the role of input current harmonic suppression, there is no need to set a power factor correction circuit (PFC circuit) in the charging circuit; at the same time, since the phase-shifting transformer 10 has multiple groups of secondary windings 11, and each group of secondary windings 11 includes multiple phase-shifted secondary windings 111, each group of secondary windings 11 can correspond to at least one AC-DC conversion circuit 20, and one AC-DC conversion circuit 20 corresponds to a group of secondary windings 11. 1. The AC-DC conversion circuit 20 can be used to convert multiple AC voltage signals output by the corresponding secondary windings 11 into DC voltage signals, so that each group of secondary windings 11 is electrically isolated and suspended from the ground. Each group of secondary windings 11 corresponds to a charging gun or at least two groups of secondary windings 11 correspond to a charging gun, so that the charging gun heads of the charging circuit meet the charging standard requirements of electrical isolation and suspension from the ground, and thus the charging circuit does not need to be provided with a DC isolation circuit, and finally the purpose of reducing the components of the charging circuit and facilitating the improvement of the power conversion efficiency of the charging circuit is achieved.

[0072] In some embodiments of the present application, see Figure 1, wherein the multiple AC voltage signals outputted by at least two groups of secondary windings 11 in the multiple groups of secondary windings 11 correspond one-to-one and have equal phases, so that the AC input voltage signals corresponding to each charging object / charging interface are consistent, avoiding the phenomenon that the AC input voltage signals are inconsistent and cause incompatibility with the charging object / charging interface. Exemplarily, the multiple AC voltage signals outputted by any two groups of secondary windings 11 in the multiple groups of secondary windings 11 correspond one-to-one and have equal phases, for example, each group of secondary windings 11 includes four phase-shifted secondary windings 111, and the phases of the AC voltage signals outputted by the four phase-shifted secondary windings 111 of each group of secondary windings 11 are offset by the same 0°, 15°, 30° and -15° respectively.

[0073] In some embodiments of the present application, see Figure 2 , Figure 2 A circuit structure schematic diagram of another charging circuit in an embodiment of the present application is shown, wherein each AC-DC conversion circuit 20 includes multiple sub-conversion circuits 21; the multiple sub-conversion circuits 21 correspond one-to-one to multiple phase-shifted secondary windings 111 in a group of secondary windings 11 corresponding to each AC-DC conversion circuit 20; each sub-conversion circuit 21 is used to convert the AC voltage signal output by the phase-shifted secondary winding 111 corresponding to each sub-conversion circuit into a second DC voltage signal.

[0074] It should be noted that, since each sub-conversion circuit 21 can convert the AC voltage signal output by its corresponding phase-shifted secondary winding 111 into a DC voltage signal, multiple AC-DC conversion circuits 20 can output a first DC voltage signal composed of multiple second DC voltage signals. When the output ends of multiple sub-conversion circuits in an AC-DC conversion circuit 20 are connected in parallel, the current of the first DC voltage signal is N times the current of the second DC voltage signal (N is the number of sub-conversion circuits 21 in each AC-DC conversion circuit 20), which can increase the charging current and charging rate; and when the output ends of multiple sub-conversion circuits 21 in an AC-DC conversion circuit 20 are connected in series, the voltage of the first DC voltage signal is N times the voltage of the second DC voltage signal, which can increase the charging voltage to meet the high-voltage charging requirements.

[0075] For example, see Figure 2The positive output ends of the multiple sub-conversion circuits 21 in the same AC-DC conversion circuit 20 are electrically connected to each other, and the negative output ends of the multiple sub-conversion circuits 21 in the same AC-DC conversion circuit 20 are electrically connected to each other, so that the output ends of the multiple sub-conversion circuits 21 in the same AC-DC conversion circuit 20 are connected in parallel. When charging the charging object, the multiple sub-conversion circuits 21 can provide charging current, thereby balancing the power of each sub-conversion circuit 21, and avoiding the problem of excessive power of a single sub-conversion circuit 21 while increasing the charging current, thereby achieving current sharing and avoiding the phenomenon that a single sub-conversion circuit is damaged due to excessive power.

[0076] For example, see Figure 3 , Figure 3 A circuit structure schematic diagram of another charging circuit in an embodiment of the present application is shown, wherein the positive output terminals and negative output terminals of multiple sub-conversion circuits 21 are connected in sequence in an arrangement order, so that the output terminals of the multiple sub-conversion circuits 21 are connected in series. When charging the charging object, the output charging voltage can be increased to meet the high-voltage charging requirements (for example, the charging voltage requirement of an electric car is relatively high).

[0077] It can be understood that switches can be provided between the sub-conversion circuits 21, and the series connection state or the parallel connection state of the sub-conversion circuits 21 can be switched by the switches to meet the charging current or charging voltage requirements of the charging object.

[0078] In some embodiments of the present application, see Figure 4 , Figure 4 A circuit structure diagram of another charging circuit in an embodiment of the present application is shown, wherein each sub-conversion circuit 21 includes a rectifier circuit 212; the rectifier circuit 212 is used to convert the AC voltage signal received by the rectifier circuit 212 into a third DC voltage signal. Specifically, the rectifier circuit 212, as the core circuit of the sub-conversion circuit 21, is mainly used to convert the AC signal into a DC signal, so that the sub-conversion circuit 21 finally outputs a DC voltage signal and charges the charging object. Exemplarily, the rectifier circuit 212 may include a rectifier circuit such as a half-wave rectifier circuit, a full-wave rectifier circuit, or a single-phase bridge rectifier circuit.

[0079] In some embodiments of the present application, the sub-conversion circuit 21 may also pre-process the AC voltage signal, and then provide the processed AC voltage signal to the rectifier circuit 212. For example, continue to refer to Figure 4, each sub-conversion circuit 21 includes a filter circuit 211; the input end of the filter circuit 211 is electrically connected to the input end of the sub-conversion circuit 21 corresponding to the filter circuit 211, and the filter circuit 211 is used to filter the AC voltage signal received by the sub-conversion circuit 21 corresponding to the filter circuit 211, so as to prevent the low-frequency or high-frequency component of the AC voltage signal from affecting the AC-DC conversion effect of the rectifier circuit 212. The filter circuit 211 includes a capacitor and / or an inductor. Exemplarily, the filter circuit 211 may include a filter circuit composed of a filter inductor and a filter capacitor to filter out electromagnetic interference through the filter inductor and the filter capacitor.

[0080] In some embodiments of the present application, the sub-conversion circuit 21 may also process the third DC voltage signal output by the rectifier circuit 212 to generate a second DC voltage signal. Figure 4 Each sub-conversion circuit 21 further includes a voltage changing circuit 213, the input end of the voltage changing circuit 213 is electrically connected to the output end of the rectifier circuit 212, and the voltage changing circuit 213 is used to boost or buck the third DC voltage signal, so as to obtain a boosted or bucked second DC voltage signal. Exemplarily, the voltage changing circuit 213 may include a boost circuit and / or a Buck circuit, so as to adjust the magnitude of the third DC output voltage through the boost circuit and / or the Buck circuit, so that the second DC output voltage meets the requirements.

[0081] It can be understood that the sub-conversion circuit 21 may also include other modules, for example, Figure 5 , Figure 5 A circuit structure diagram of an AC-DC conversion circuit 20 in an embodiment of the present application is shown. The AC-DC conversion circuit 20 may also include a voltage regulating circuit 22 and / or an output filter circuit 23. The voltage regulating circuit 22 is electrically connected to the output ends of multiple sub-conversion circuits 21 in the same AC-DC conversion circuit 20 corresponding to the voltage regulating circuit 22, so as to further adjust the voltage of the DC voltage signal output by the multiple sub-conversion circuits 21 and filter out the noise in the DC voltage signal output by the multiple sub-conversion circuits 21 through the output filter circuit 23. Exemplarily, the voltage regulating circuit 22 may include a boost circuit and / or a buck circuit, and the output filter circuit 23 may include a filter circuit composed of at least one of a resistor / inductor and a capacitor.

[0082] In some embodiments of the present application, see Figure 6 , Figure 6The circuit structure diagram of a sub-conversion circuit 21 in an embodiment of the present application is shown, wherein the voltage changing circuit 213 includes a first inductor L1, a first diode D1 and a first switch S1; one end of the first inductor L1 is electrically connected to the first output end of the rectifier circuit 212, and the other end is electrically connected to the positive electrode of the first diode D1; the first end of the first switch S1 is connected to the first node M1 between the first inductor L1 and the first diode D1, and the second end of the first switch S1 is electrically connected to the second output end of the rectifier circuit 212. Specifically, when the first switch S1 is closed, the first inductor L1 is excited to store energy, and after the first switch S1 is opened, the energy stored in the first inductor L1 is released, so that the current output by the first inductor L1 is greater than the input current. When charging the corresponding capacitor, the voltage across the capacitor will increase due to the increase in current, thereby achieving the purpose of boosting the third DC voltage signal.

[0083] Further, in some embodiments of the present application, continue to refer to Figure 7 , Figure 7 A circuit structure schematic diagram of another sub-conversion circuit in an embodiment of the present application is shown, wherein the voltage changing circuit 213 also includes a second inductor L2, a second diode D2 and a second switch S2; one end of the second inductor L2 is electrically connected to the first output end of the rectifier circuit 212, and the other end is electrically connected to the positive electrode of the second diode D2, and the negative electrode of the second diode D2 is electrically connected to the negative electrode of the first diode D1; the first end of the second switch S2 is connected to the second node M2 ​​between the second inductor L2 and the second diode D2, and the second end of the second switch S2 is electrically connected to the second output end of the rectifier circuit 212.

[0084] It should be noted that when the second switch S2 is closed, the second inductor L2 is excited to store energy, and after the second switch S2 is opened, the energy stored in the second inductor L2 is released, so that the current output by the second inductor L2 is necessarily greater than the input current. When charging the corresponding capacitor, the voltage across the capacitor will increase due to the increase in current, thereby achieving the purpose of boosting the third DC voltage signal. At the same time, since the second inductor L2 and the second diode D2 form a branch in parallel with the first inductor L1 and the first diode D1, when the inductance values ​​of the first inductor L1 and the second inductor L2 are different, the first switch S1 and the second switch S2 are controlled to open and close, so that the purpose of boosting the third DC voltage signal with different amplitudes can be achieved, which is conducive to improving the flexibility of changing the voltage of the DC voltage signal.

[0085] It can be understood that the first switch S1 and the second switch S2 can also be controlled to open and close at the same time, so as to simultaneously control the output current of the first inductor L1 and the second inductor L2 to increase and increase the voltage across the capacitor. Alternatively, the voltage changing circuit 213 can also be a boost circuit composed of at least three boost module circuits connected in parallel, and the boost module circuit can include Figure 6 The boost circuit is composed of the first inductor L1, the first diode D1 and the first switch S1.

[0086] In some embodiments of the present application, see Figure 8 , Figure 8 A circuit structure diagram of another sub-conversion circuit in an embodiment of the present application is shown, wherein the voltage changing circuit 213 includes a third inductor L3, a third diode D3 and a third switch S3; the first end of the third switch S3 is electrically connected to the first output end of the rectifier circuit 212, and the second end of the third switch S3 is electrically connected to one end of the third inductor L3; the positive electrode of the third diode D3 is electrically connected to the second output end of the rectifier circuit 212, and the negative electrode of the third diode D3 is connected to the third node M3 between the third switch S3 and the third inductor L3. Specifically, when the third switch S3 is closed, the third inductor L3 is excited to store energy, and after the third switch S3 is disconnected, the polarity of the third inductor L3 is deflected, and the capacitor connected in parallel at both ends of the positive and negative electrodes of the rectifier circuit 212 is passed through the third diode D3 to the third inductor L3, so that the voltage at both ends of the capacitor is reduced, thereby achieving the purpose of reducing the voltage of the third DC voltage signal.

[0087] Further, in some embodiments of the present application, continue to refer to Fig. 9 , Fig. 9 A circuit structure schematic diagram of another sub-conversion circuit in an embodiment of the present application is shown, wherein the voltage changing circuit 213 includes a fourth inductor L4, a fourth diode D4 and a fourth switch S4; a first end of the fourth switch S4 is electrically connected to the first output end of the rectifier circuit 212, a second end of the fourth switch S4 is electrically connected to one end of the fourth inductor L4, and the other end of the fourth inductor L4 is electrically connected to the other end of the third inductor L3; an anode of the fourth diode D4 is electrically connected to the second output end of the rectifier circuit 212, and a cathode of the fourth diode D4 is connected to a fourth node M4 between the fourth switch S4 and the fourth inductor L4.

[0088] It should be noted that when the fourth switch S4 is closed, the fourth inductor L4 is excited to store energy, and after the fourth switch S4 is disconnected, the polarity of the fourth inductor L4 is deflected, and the capacitor connected in parallel to the positive and negative ends of the rectifier circuit 212 is passed through the fourth diode D4 to the fourth inductor L4, so that the voltage across the capacitor is reduced, thereby achieving the purpose of reducing the voltage of the third DC voltage signal. At the same time, since the fourth inductor L4 and the fourth switch S4 form a branch connected in parallel with the third inductor L3 and the third switch S3, when the inductance values ​​of the third inductor L3 and the fourth inductor L4 are different, the third switch S3 and the fourth switch S4 are controlled to open and close, so that the third DC voltage signal can be reduced by different amplitudes, which is conducive to improving the flexibility of changing the voltage of the DC voltage signal.

[0089] It is worth noting that the first switch S1, the second switch S2, the third switch S3 and the fourth switch S4 can be MOS tubes, triodes or IGBT tubes, and are not limited to the NMOS tubes shown in the figure. Alternatively, the voltage changing circuit 213 can also be a step-down circuit composed of at least three step-down module circuits connected in parallel, and the step-down module circuit can include Figure 8 The step-down circuit is composed of the third inductor L3, the third diode D3 and the third switch S3.

[0090] In some embodiments of the present application, see Figure 1 , wherein the charging circuit further includes a plurality of switching circuits 30; the plurality of switching circuits 30 correspond one-to-one to the plurality of AC-DC conversion circuits 20, and each switching circuit 30 includes a first switching switch S01 and a second switching switch S02; a first end of the first switching switch S01 is electrically connected to an output end of the AC-DC conversion circuit 20 corresponding to the first switching switch S01, and the first switching switch S01 is used to conduct a power supply line of the charging circuit to provide electric energy to the first charging object 40; a first end of the second switching switch S02 is electrically connected to an output end of the AC-DC conversion circuit 20 corresponding to the second switching switch S02, and the second switching switch S02 is used to conduct a power supply line of the charging circuit to provide electric energy to the second charging object 50.

[0091] Each AC-DC conversion circuit 20 corresponds to a first switching switch S01.

[0092] For example, the first charging object 40 may refer to a battery pack to be charged, and the second charging object 50 may refer to an electric vehicle. When the charging circuit does not have a corresponding electric vehicle to charge, the first switching switch S01 may be controlled to close to charge the battery pack to be charged, so as to avoid the phenomenon of peak power consumption caused by the charging circuit charging the electric vehicle and the battery pack to be charged at the same time; on the contrary, when the charging station charges the electric vehicle, the first switching switch S01 may be disconnected, and the second switching switch S02 may be controlled to close, so as to increase the charging speed of the charging vehicle and ensure the user experience.

[0093] It is understandable that the first switching switch S01 and the second switching switch S02 can also be controlled to be closed at the same time, so that the charging circuit can charge the electric vehicle and the battery pack to be charged at the same time, for example, charging the electric vehicle and the battery to be charged at the same time at night; or, the first charging object 40 and the second charging object 50 can also refer to other power-consuming objects such as battery vehicles, electric scooters, and electric tricycles. The second charging object 50 can also be an electric tool vehicle, such as a battery-powered forklift, truck, etc.

[0094] In some embodiments of the present application, each set of secondary windings 11 includes a first charging output terminal, which is used to connect to a second charging object 50 and provide electrical energy to the second charging object 50; the second ends of the plurality of second switching switches S02 corresponding to each set of secondary windings 11 are connected in parallel and electrically connected to the same first charging output terminal. Fig.10 , Fig.10 A circuit schematic diagram of a charging circuit connected to a charging object in an embodiment of the present application is shown. The first charging output end of each set of secondary windings 11 is connected to multiple AC-DC conversion circuits 20; the first switching switch S01 corresponding to each AC-DC conversion circuit 20 is used to connect the first charging object 40, and the multiple second switching switches S02 corresponding to each set of secondary windings 11 are used to connect the same second charging object 50. The first charging output end can be a charging gun, or other forms of circuit output ports.

[0095] That is to say, in the above embodiment, the DC voltage signal output by each AC-DC conversion circuit 20 is only used to charge one first charging object 40, while the DC voltage signals output by the multiple AC-DC conversion circuits 20 corresponding to each group of secondary windings 11 are used to charge the same second charging object 50. Relatively speaking, the charging current provided by the first charging output end of each group of secondary windings 11 to the second charging object 50 will be approximately N times that of the first charging object 40, where N is the number of the multiple AC-DC conversion circuits 20 corresponding to each group of secondary windings 11. Therefore, by connecting the multiple second switching switches S02 corresponding to each group of secondary windings 11 to the same second charging object 50, the charging rate of the second charging object 50 (such as an electric car) can be improved.

[0096] It should be noted that the first switching switch S01 (or the second switching switch S02) may refer to a switch, for example, a single switch connected to the positive output terminal or the negative output terminal of the AC-DC conversion circuit 20. The first switching switch S01 (or the second switching switch S02) may also refer to multiple switches, for example, two switches simultaneously arranged on the power supply lines corresponding to the positive output terminal and the negative output terminal of the AC-DC conversion circuit 20, so that the charging object (the first charging object 40 or the second charging object 50) is disconnected from the positive output terminal and the negative output terminal of the AC-DC conversion circuit 20 through the two switches at the same time; at the same time, when the second switching switch S02 refers to two switches simultaneously arranged on the power supply lines corresponding to the positive output terminal and the negative output terminal of the AC-DC conversion circuit 20, the connection of the second switching switch S02 with the second charging object 50 means that the second switching switch S02 connected to the positive output terminal of the AC-DC conversion circuit 20 is connected to the positive charging terminal (positive input terminal) of the charging object, and the second switching switch S02 connected to the negative output terminal of the AC-DC conversion circuit 20 is connected to the negative charging terminal (negative input terminal) of the charging object.

[0097] In some embodiments of the present application, at least two of the multiple groups of secondary windings 11 correspond to the same second charging output terminal, and the second charging output terminal is used to connect to the second charging object 50 to provide power to the second charging object 50; the second ends of the multiple second switching switches S02 corresponding to the at least two groups of secondary windings 11 are connected in parallel and electrically connected to the same second charging output terminal. Fig.11 , Fig.11 A circuit schematic diagram of another charging circuit connected to a charging object in an embodiment of the present application is shown, wherein a plurality of second switching switches S02 corresponding to at least one group of secondary windings 11 are connected to the negative electrode of an AC-DC conversion circuit 20 corresponding to another group of secondary windings 11. The second charging output terminal may be a charging gun, or other forms of circuit output ports.

[0098] That is to say, at this time, the multiple AC-DC conversion circuits 20 corresponding to different secondary windings 11 are connected in series through some second switching switches S02, and the AC-DC conversion circuits 20 corresponding to multiple groups of secondary windings 11 charge the same second charging object 50 at the same time. Fig.11 As shown, the four AC-DC conversion circuits 20 corresponding to the two groups of secondary windings 11 charge the same second charging object 50 at the same time, wherein the two AC-DC conversion circuits 20 corresponding to each group of secondary windings 11 are in parallel, thereby increasing the charging current of the second charging object 50; and the two AC-DC conversion circuits 20 corresponding to the two groups of secondary windings 11 are in series, thereby increasing the charging voltage of the second charging object 50, so as to simultaneously increase the charging voltage and charging current of the second charging object 50, and further increase the charging rate of the second charging object 50.

[0099] It is worth noting that the above content about the charging circuit is intended to clearly illustrate the implementation verification process of the present application. Under the guidance of the present application, those skilled in the art can also make equivalent modified designs. For example, each sub-conversion circuit 21 is provided with a corresponding voltage regulating circuit 22 and an output filter circuit 23.

[0100] Furthermore, in order to better implement the charging circuit in the embodiment of the present application, on the basis of the charging circuit, the present application also provides a charging system, and the charging system includes the charging circuit as in any of the above embodiments. Since the charging system in the embodiment of the present application is provided with the charging circuit of the above embodiment, it has all the beneficial effects of the above charging circuit, which will not be described in detail here.

[0101] Furthermore, in order to better implement the charging circuit in the embodiment of the present application, on the basis of the charging circuit, the present application also provides a charging device, and the charging device includes a charging circuit as in any of the above embodiments. Since the charging device in the embodiment of the present application is provided with the charging circuit of the above embodiment, it has all the beneficial effects of the above charging circuit, which will not be described in detail here.

[0102] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the detailed description of other embodiments above, and will not be repeated here.

[0103] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0104] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0105] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more embodiments of the invention, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0106] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0107] Each patent, patent application, patent application publication, and other materials, such as articles, books, specifications, publications, documents, etc., cited in this application is hereby incorporated by reference in its entirety, except for application history documents that are inconsistent with or conflicting with the content of this application, and documents that limit the broadest scope of the claims of this application (currently or later attached to this application). It should be noted that if the descriptions, definitions, and / or use of terms in the accompanying materials of this application are inconsistent or conflicting with the content described in this application, the descriptions, definitions, and / or use of terms in this application shall prevail.

[0108] The above is a detailed introduction to a charging circuit, a charging device and a charging system provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A charging circuit, characterized in that: include: A phase-shifting transformer, wherein the phase-shifting transformer has a plurality of groups of secondary windings, each group of the secondary windings includes a plurality of phase-shifting secondary windings, and each of the phase-shifting secondary windings is used to output an AC voltage signal, so that each group of the secondary windings outputs a plurality of AC voltage signals; A plurality of AC-DC conversion circuits, each group of the secondary windings being electrically connected to at least one of the plurality of the AC-DC conversion circuits, each of the AC-DC conversion circuits being electrically connected to a plurality of phase-shifted secondary windings of a group of secondary windings in the phase-shifting transformer, each of the AC-DC conversion circuits being used to convert a plurality of the AC voltage signals corresponding to each of the AC-DC conversion circuits into a first DC voltage signal; Among them, the phases of the AC voltage signals output by at least two phase-shifted secondary windings in each group of secondary windings are not equal.

2. The charging circuit according to claim 1, characterized in that: Each of the AC-DC conversion circuits comprises a plurality of sub-conversion circuits, and the plurality of sub-conversion circuits correspond one-to-one to a plurality of phase-shifted secondary windings in a group of secondary windings corresponding to each of the AC-DC conversion circuits; Each of the sub-conversion circuits is used to convert the AC voltage signal output by the phase-shifted secondary winding corresponding to each of the sub-conversion circuits into a second DC voltage signal.

3. The charging circuit according to claim 2, characterized in that: Each of the sub-conversion circuits includes a rectifier circuit; The rectifier circuit is used to convert the AC voltage signal received by the rectifier circuit into a third DC voltage signal.

4. The charging circuit according to claim 3, characterized in that: Each of the sub-conversion circuits also includes a filtering circuit; The input end of the filter circuit is electrically connected to the input end of the sub-conversion circuit corresponding to the filter circuit, and the filter circuit is used to filter the AC voltage signal received by the sub-conversion circuit corresponding to the filter circuit.

5. The charging circuit according to claim 4, characterized in that: Each of the sub-conversion circuits also includes a voltage changing circuit; The input end of the voltage changing circuit is electrically connected to the output end of the rectifier circuit, and the voltage changing circuit is used to step up or step down the third DC voltage signal.

6. The charging circuit according to claim 5, characterized in that: The voltage changing circuit includes a first inductor, a first diode and a first switch; One end of the first inductor is electrically connected to the first output end of the rectifier circuit, and the other end is electrically connected to the anode of the first diode; A first end of the first switch is connected to a first node between the first inductor and the first diode, and a second end of the first switch is electrically connected to a second output end of the rectifier circuit.

7. The charging circuit according to claim 6, characterized in that: The voltage changing circuit further includes a second inductor, a second diode and a second switch; One end of the second inductor is electrically connected to the first output end of the rectifier circuit, and the other end of the second inductor is electrically connected to the anode of the second diode, and the cathode of the second diode is electrically connected to the cathode of the first diode; A first end of the second switch is connected to a second node between the second inductor and the second diode, and a second end of the second switch is electrically connected to a second output end of the rectifier circuit.

8. The charging circuit according to claim 5, characterized in that: The voltage changing circuit includes a third inductor, a third diode and a third switch; The first end of the third switch is electrically connected to the first output end of the rectifier circuit, and the second end of the third switch is electrically connected to one end of the third inductor; An anode of the third diode is electrically connected to the second output end of the rectifier circuit, and a cathode of the third diode is connected to a third node between the third switch and the third inductor.

9. The charging circuit according to claim 8, characterized in that: The voltage changing circuit includes a fourth inductor, a fourth diode and a fourth switch; A first end of the fourth switch is electrically connected to the first output end of the rectifier circuit, a second end of the fourth switch is electrically connected to one end of the fourth inductor, and the other end of the fourth inductor is electrically connected to the other end of the third inductor; An anode of the fourth diode is electrically connected to the second output end of the rectifier circuit, and a cathode of the fourth diode is connected to a fourth node between the fourth switch and the fourth inductor.

10. The charging circuit according to claim 2, characterized in that: The output ends of the multiple sub-conversion circuits of each of the AC-DC conversion circuits are connected in series or in parallel to generate the first DC voltage signal from the multiple second DC voltage signals output by the multiple sub-conversion circuits.

11. The charging circuit according to claim 10, characterized in that: Each of the AC-DC conversion circuits also includes a voltage regulating circuit; The voltage regulating circuit is electrically connected to output ends of a plurality of sub-conversion circuits of an AC-DC conversion circuit corresponding to the voltage regulating circuit, and the voltage regulating circuit is used to adjust the voltage of the first DC voltage signal.

12. The charging circuit according to claim 1, characterized in that: The multiple AC voltage signals output by at least two groups of secondary windings among the multiple groups of secondary windings correspond to each other one by one and have equal phases.

13. The charging circuit according to claim 1, characterized in that: The charging circuit also includes a plurality of switching circuits; The plurality of switching circuits correspond to the plurality of AC-DC conversion circuits one by one, and each of the switching circuits includes a first switching switch and a second switching switch; The first end of the first switching switch is electrically connected to the output end of the AC-DC conversion circuit corresponding to the first switching switch, and the first switching switch is used to turn on the power supply line of the charging circuit to provide electric energy to the first charging object; the first end of the second switching switch is electrically connected to the output end of the AC-DC conversion circuit corresponding to the second switching switch, and the second switching switch is used to turn on the power supply line of the charging circuit to provide electric energy to the second charging object.

14. The charging circuit according to claim 13, characterized in that: Each group of the secondary windings comprises a first charging output terminal, wherein the first charging output terminal is used to connect the second charging object to provide electrical energy to the second charging object; The second ends of the plurality of second switching switches corresponding to each group of the secondary windings are connected in parallel and then electrically connected to the same first charging output end.

15. The charging circuit according to claim 13, characterized in that: At least two groups of secondary windings among the multiple groups of secondary windings correspond to the same second charging output end, and the second charging output end is used to connect to the second charging object and provide electrical energy to the second charging object; The second ends of the plurality of second switching switches corresponding to at least two groups of the secondary windings are connected in parallel and electrically connected to the same second charging output end.

16. A charging system, characterized in that: Comprising a charging circuit as claimed in any one of claims 1 to 15.

17. A charging device, characterized in that: Comprising a charging circuit as claimed in any one of claims 1 to 15.

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