Charging module and charging system

Abstract

The utility model discloses a charging module and a charging system, and relates to the technical field of charging. The charging module comprises an AC conversion circuit and at least one set of DC conversion circuit connected with the AC conversion circuit. The DC conversion circuit comprises an output electrolysis module, an anti-reverse module and a discharge absorption module. The discharge absorption module comprises a first discharge unit, a second discharge unit, a discharge switch unit and an absorption unit, the first discharge unit and the second discharge unit are connected in series and then connected between the first node and the second node in parallel, and one end of the absorption unit is connected between the reverse prevention module and the load; the other end of the absorption unit is connected between the first discharge unit and the second discharge unit, and the discharge switch unit is connected between the second discharge unit and a second node; the first discharge unit and the second discharge unit are both composed of resistors, and the absorption unit is composed of capacitors. Therefore, the discharge resistor is shared as the absorption resistor, and the cost of the charging module is reduced.

Description

Technical Field

[0001] This application relates to the field of charging technology, and in particular to a charging module and a charging system. Background Technology

[0002] In the charging module, due to the switching of battery load, the switching action may cause oscillation and voltage spikes on the anti-reverse diode. Excessive voltage spikes may cause the anti-reverse diode to fail, thereby affecting the safety performance of the charging pile. Therefore, absorbing output surges and suppressing circuit oscillations are key technologies to ensure the safe and stable operation of the system.

[0003] The existing solution is to introduce a separate RC snubber circuit in the charging module to absorb voltage spikes on the anti-reverse diode and suppress oscillations. However, the introduction of additional components will significantly increase the system cost. Utility Model Content

[0004] The main objective of this application is to provide a charging module and charging system that allows the discharge resistor to be used as the absorption resistor, thereby reducing the cost of the charging module.

[0005] To achieve the above objectives, this application provides a charging module, including an AC conversion circuit and at least one set of DC conversion circuits connected to the AC conversion circuit, wherein the DC conversion circuit includes an output electrolysis module, an anti-reverse module, and a discharge absorption module.

[0006] One end of the anti-reverse module is connected to one end of the output electrolysis module to form a first node, the other end of the anti-reverse module is connected to the load, and the other end of the output electrolysis module is connected to the load to form a second node;

[0007] The discharge absorption module includes a first discharge unit, a second discharge unit, a discharge switch unit, and an absorption unit. The first discharge unit and the second discharge unit are connected in series and then in parallel between the first node and the second node. One end of the absorption unit is connected between the anti-reverse module and the load, and the other end of the absorption unit is connected between the first discharge unit and the second discharge unit. The discharge switch unit is connected between the second discharge unit and the second node. The first discharge unit and the second discharge unit are both composed of resistors, and the absorption unit is composed of capacitors.

[0008] Optionally, the first discharge unit includes a first resistor, and the second discharge unit includes a second resistor; one end of the first resistor is connected to the first node, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is connected to the discharge switch unit.

[0009] Optionally, the absorption unit includes a first capacitor; one end of the first capacitor is connected between the anti-reverse module and the load, and the other end of the first capacitor is connected between the first resistor and the second resistor.

[0010] Optionally, the discharge switch unit includes a switch transistor; the two ends of the switch transistor are respectively connected to the second discharge unit and the second node.

[0011] Optionally, the output electrolysis module includes a second capacitor, a third capacitor, and a first inductor; one end of the second capacitor is connected to one end of the primary coil of the first inductor, the other end of the second capacitor is connected to one end of the third capacitor, the other end of the third capacitor is connected to the other end of the primary coil of the first inductor, and the secondary side of the first inductor is connected between the first node and the second node.

[0012] Optionally, the anti-reverse module includes at least one anti-reverse diode; when the anti-reverse module includes one anti-reverse diode, the anode of the anti-reverse diode is connected to the first node, and the cathode of the anti-reverse diode is connected to the load; when the anti-reverse module includes two anti-reverse diodes, the anode of one anti-reverse diode is connected to the first node, the cathode of the anti-reverse diode is connected to the anode of the other anti-reverse diode, and the cathode of the other anti-reverse diode is connected to the load.

[0013] Optionally, the DC conversion circuit further includes a first transformer, a second transformer, a first rectifier unit, and a second rectifier unit; the primary side of the first transformer is connected to the AC conversion circuit, the secondary side of the first transformer is connected to the first rectifier unit, the first output terminal of the first rectifier unit is connected to one end of the second capacitor, and the second output terminal of the first rectifier unit is connected between the second capacitor and the third capacitor; the primary side of the second transformer is connected to the AC conversion circuit, the secondary side of the second transformer is connected to the second rectifier unit, the first output terminal of the second rectifier unit is connected between the second capacitor and the third capacitor, and the second output terminal of the second rectifier unit is connected to one end of the third capacitor.

[0014] Optionally, the first rectifier unit includes a first diode, a second diode, a third diode, and a fourth diode; the anode of the first diode is connected to the cathode of the second diode to serve as one input terminal of the first rectifier unit, the anode of the third diode is connected to the cathode of the fourth diode to serve as another input terminal of the first rectifier unit, the cathode of the first diode is connected to the cathode of the third diode to serve as a first output terminal of the first rectifier unit, and the anode of the second diode is connected to the anode of the fourth diode to serve as a second output terminal of the first rectifier unit; the second rectifier unit includes a fifth diode, a sixth diode, a seventh diode, and an eighth diode; the anode of the fifth diode is connected to the cathode of the sixth diode to serve as one input terminal of the second rectifier unit, the anode of the seventh diode is connected to the cathode of the eighth diode to serve as another input terminal of the second rectifier unit, the cathode of the fifth diode is connected to the cathode of the seventh diode to serve as a first output terminal of the second rectifier unit, and the anode of the sixth diode is connected to the anode of the eighth diode to serve as a second output terminal of the second rectifier unit.

[0015] Optionally, the DC conversion circuit further includes a switching module, which includes a first switching unit and a second switching unit; the first switching unit is connected in parallel between the first output terminal of the first rectifier unit and the first output terminal of the second rectifier unit; the second switching unit is connected in parallel between the second output terminal of the first rectifier unit and the second output terminal of the second rectifier unit.

[0016] In addition, to achieve the above objectives, this application also provides a charging system including at least one charging module as described above.

[0017] The charging module of this application comprises a first discharge unit and a second discharge unit, both of which are resistors used for discharging. These resistors are a common component of any charging module. The absorption unit comprises a capacitor used for absorbing voltage spikes. By connecting one end of the absorption unit between the first and second discharge units, the resistors used for discharging in both units can also be used as absorption resistors to absorb voltage spikes from the anti-reverse diode. By using the discharge resistors as absorption resistors, the charging module does not need to add resistors for absorbing voltage spikes, thus effectively reducing the cost of the charging module while ensuring the safety of the anti-reverse diode and improving the stability and reliability of the charging module. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an example charging module of this application;

[0019] Figure 2 This is a schematic diagram of the structure of a charging module, which is another example of this application;

[0020] Figure 3 This is one of the structural schematic diagrams of the charging module according to an embodiment of this application;

[0021] Figure 4 This is a second schematic diagram of the structure of the charging module according to an embodiment of this application;

[0022] Figure 5 This is the third schematic diagram of the charging module in this application embodiment;

[0023] Figure 6 This is the fourth structural schematic diagram of the charging module according to an embodiment of this application;

[0024] Figure 7 This is the fifth schematic diagram of the charging module in the embodiments of this application;

[0025] In the diagram, 100 is the AC conversion circuit; 200 is the DC conversion circuit; 210 is the output electrolysis module; 220 is the anti-reverse module; 230 is the discharge absorption module; 231 is the first discharge unit; 232 is the second discharge unit; 233 is the discharge switch unit; 234 is the absorption unit; and 240 is the switch module.

[0026] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] In the field of electric vehicle charging equipment, especially DC charging equipment, ensuring the stability and safety of power transmission is crucial. During the operation of the charging equipment, when the contactor between the load and the DC conversion circuit of the charging module closes, high-frequency oscillations and voltage spikes are easily generated across the anti-reverse diode of the charging module at the moment of closure. Excessive oscillations and voltage spikes may cause the anti-reverse diode to fail, thereby threatening the safety of the charging equipment. Therefore, in existing charging modules, an RC absorption circuit is usually added to suppress oscillations and absorb voltage spikes.

[0029] Figure 1 This is a schematic diagram of the structure of an example charging module of this application. For example... Figure 1As shown, the output side of a charging module typically consists of a separate discharge circuit and an absorption circuit. The discharge circuit comprises multiple discharge resistors R1-1 and a switch S1-1, with the resistors R1-1 connected in series and parallel. When the charging module stops operating, the battery load voltage remains unchanged. At this time, the voltage of the electrolytic capacitor C1-1 on the bus needs to be released to near 0V. Due to the reverse-current protection function of the anti-reverse diode D1-1, the voltage of the external battery load will not affect the discharge of the electrolytic capacitor C1-1. However, the switching action of the battery load can cause high-frequency oscillations and voltage spikes on the anti-reverse diode D1-1. These high-frequency oscillations and voltage spikes may cause the anti-reverse diode D1-1 to fail, thus disabling the reverse protection function and potentially endangering the safety of the charging module. Therefore, as... Figure 1 As shown, an RC absorption circuit consisting of an absorption capacitor C1-2 and an absorption resistor R1-2 is usually added across the anti-reverse diode D1-1, but the introduction of RC increases the cost.

[0030] Figure 2 This is a schematic diagram of the structure of a charging module, as shown in another example of this application. Figure 2 As shown, in an existing charging module, the discharge circuit and RC absorption circuit are integrated, sharing the discharge resistor and absorption resistor to reduce costs. However, this solution has significant drawbacks: First, the switching transistor Q2-1 must be floating, requiring the drive circuit to use an isolated design, increasing drive costs. Second, the parasitic body diode of the switching transistor Q2-1 introduces parasitic effects—if the switching transistor Q2-1 is not closed, the electrolytic capacitor C2-2 is usually large and effectively short-circuited. In this case, the discharge resistor R2-1 is equivalent to a body diode in parallel, which reduces the effectiveness of absorbing voltage spikes. If the switching transistor Q2-1 is closed, the absorption capacitor C2-1 is approximately directly connected in parallel across the anti-reverse diode D2-1, relying solely on the absorption capacitor C2-1 for absorption without a damping resistor, making it difficult to effectively suppress oscillations. Therefore, while the existing integrated solution aims to save costs, it sacrifices performance reliability due to compromises in circuit structure.

[0031] Based on this, this application provides a charging module and charging system. On the basis of the original charging module circuit, by shorting the absorption capacitor between multiple discharge resistors, a composite circuit composed of discharge resistors and absorption capacitors is formed. This composite circuit can not only suppress oscillations, but also achieve discharge absorption and absorption of voltage spikes. Therefore, without affecting other functions of the charging module and ensuring the damping suppression effect of the discharge resistors, the cost of the charging module can be effectively reduced.

[0032] Figure 3 This is one of the structural schematic diagrams of the charging module according to an embodiment of this application. For example... Figure 3As shown, the charging module may include an AC conversion circuit 100 and at least one set of DC conversion circuits 200 connected to the AC conversion circuit 100. The DC conversion circuit 200 includes an output electrolysis module 210, an anti-reverse module 220, and a discharge absorption module 230.

[0033] The anti-reverse module 220 is connected at one end to one end of the output electrolysis module 210 to form a first node N1, and the other end of the anti-reverse module 220 is connected to the load. The other end of the output electrolysis module 210 is also connected to the load to form a second node N2. The discharge absorption module 230 includes a first discharge unit 231, a second discharge unit 232, a discharge switch unit 233, and an absorption unit 234. The first discharge unit 231 and the second discharge unit 232 are connected in series and then in parallel between the first node N1 and the second node N2. One end of the absorption unit 234 is connected between the anti-reverse module 220 and the load, and the other end of the absorption unit 234 is connected between the first discharge unit 231 and the second discharge unit 232. The discharge switch unit 233 is connected between the second discharge unit 232 and the second node N2. The first discharge unit 231 and the second discharge unit 232 are both composed of resistors, and the absorption unit 234 is composed of capacitors.

[0034] First, it should be noted that the circuit structure of the charging module is usually composed of a front-end PFC (i.e., the AC conversion circuit 100 in this embodiment) and a DC / DC conversion (i.e., the DC conversion circuit 200 in this embodiment). The AC conversion circuit 100 rectifies the input AC power into DC power; it further uses a large-capacity electrolytic capacitor for voltage regulation and filtering output. The DC conversion circuit 200 converts the output through two or more LLC resonant cavities, and at the output end, it achieves a wide range of output from low voltage 50V to high voltage 1000V through a series and parallel combination of switches.

[0035] In this embodiment, the output electrolytic module 210 in the DC-DC converter circuit 200 can be composed of multiple large-capacity electrolytic capacitors. The output electrolytic module 210 can regulate and filter the DC power output from the preceding AC-DC converter circuit 100, and then output the regulated and filtered DC power to the load. The reverse polarity protection module 220 can be located on the output side of the DC-DC converter circuit 200, specifically between the output electrolytic module 210 and the load. Its main purpose is to prevent direct high-voltage connection from the subsequent load, which could damage or disable the output electrolytic module 210. The reverse polarity protection module 220 can be composed of multiple reverse polarity protection diodes Dx.

[0036] Specifically, one end of the anti-reverse module 220 can be connected to one end of the output electrolysis module 210 to form a first node N1, the other end of the anti-reverse module 220 can be connected to the positive terminal of the load, and the other end of the output electrolysis module 210 can be connected to the negative terminal of the load to form a second node N2. It should be noted that in the scenario where the charging station is charging an electric vehicle, the load can be the battery in the electric vehicle to be charged.

[0037] In this embodiment, the discharge absorption module 230 is mainly used to discharge the electrolytic capacitor in the output electrolytic module 210, absorb voltage spikes on the anti-reverse module 220, and suppress oscillations. Specifically, the discharge absorption module 230 may include a first discharge unit 231, a second discharge unit 232, a discharge switch unit 233, and an absorption unit 234. The first discharge unit 231 and the second discharge unit 232 are mainly composed of resistors, which are the resistors used to realize the discharge function in conventional charging modules. The first discharge unit 231 and the second discharge unit 232 can be formed by connecting the resistors in series and parallel.

[0038] It should be noted that the equivalent resistance of the first discharge unit 231 and the equivalent resistance of the second discharge unit 232 can be the same or different. However, the equivalent resistance of the first discharge unit 231 and the equivalent resistance of the second discharge unit 232 can be set to be larger, resulting in better absorption.

[0039] Furthermore, one end of the absorption unit 234 can be connected between the anti-reverse module 220 and the load, and the other end can be connected between the first discharge unit 231 and the second discharge unit 232. The absorption unit 234 can be composed of a capacitor, which is the absorption capacitor of the RC absorption circuit in the conventional charging module. The absorption unit 234 can be formed by connecting the capacitors in series and parallel.

[0040] Discharge switch unit 233 is connected between the second discharge unit 232 and the second node N2. Discharge switch unit 233 is used to turn the discharge function of discharge absorption module 230 on and off. Specifically, when the charging module stops, discharge switch unit 233 can be closed first to discharge the electrolytic capacitor in output electrolytic module 210. When the electrolytic capacitor discharges to near or reach 0V, the electrolytic capacitor discharge process ends. If the discharge process ends but discharge switch unit 233 remains closed, the resistors in the first discharge unit 231 and the second discharge unit 232 act as absorption resistors and form an RC circuit with the capacitor in absorption unit 234, which is connected in parallel across the anti-reverse module 220 to absorb voltage spikes for anti-reverse module 220. It should be noted that when the discharge process ends and the discharge switch unit 233 remains closed, since the capacitance of the electrolytic capacitor is much larger than the capacitance of the capacitor in the absorption unit 234, the branch where the output electrolytic module 210 is located is equivalent to a short circuit, and the first discharge unit 231 and the second discharge unit 232 are equivalent to being connected in parallel and then in series with the absorption unit 234.

[0041] When the discharge switch unit 233 is in the open state, the branch where the output electrolysis module 210 is located is equivalent to a short circuit. The first discharge unit 231 is equivalent to being connected in series with the absorption unit 234 and then connected in parallel across the anti-reverse module 220. The resistor in the first discharge unit 231 continues to act as an absorption resistor, and the resistor in the first discharge unit 231 still has a damping absorption effect, thereby achieving the purpose of suppressing oscillation.

[0042] Therefore, the resistors in the first discharge unit 231 and the second discharge unit 232 can be used for both discharge absorption and absorption of voltage spikes on the anti-reverse module 220. Furthermore, regardless of the state of the discharge switch unit 233, the resistor in the first discharge unit 231 can provide damping absorption and suppress oscillations. This saves on absorption resistors and reduces the cost of the charging module.

[0043] It is worth mentioning that, since the discharge absorption module 230 provided in this embodiment is located on the output side of the DC conversion circuit 200, the topology of the AC conversion circuit 100 and other modules in the DC conversion circuit 200 will not affect the absorption protection function and absorption effect of the discharge absorption module 230. Therefore, the discharge absorption module 230 provided in this embodiment can be used in any charging module topology.

[0044] Furthermore, it should be noted that the charging module in this embodiment may include multiple DC conversion circuits 200, and the structure of each DC conversion circuit 200 may be the same or different. The more DC conversion circuits 200 the charging module has, the higher its working efficiency, flexibility, and stability.

[0045] Each DC conversion circuit 200 is connected to the AC conversion circuit 100 and the load. Each DC conversion circuit 200 may have multiple rectifier bridges (i.e., the first rectifier unit and the second rectifier unit described in subsequent embodiments). In this embodiment, the number of rectifier bridges in each DC conversion circuit 200 can be set according to requirements. Each rectifier bridge is connected to the output electrolysis module 210. The rectifier bridge is used to rectify the AC power output by the AC conversion circuit 100 and output fluctuating DC power.

[0046] The following sections will provide a detailed introduction to each module in the DC conversion circuit 200.

[0047] Figure 4 This is a second structural schematic diagram of the charging module according to an embodiment of this application. Figure 4 As shown, in some embodiments, the first discharge unit 231 includes a first resistor R1, and the second discharge unit 232 includes a second resistor R2. One end of the first resistor R1 is connected to the first node N1, the other end of the first resistor R1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to the discharge switch unit 233.

[0048] In this embodiment, the first discharge unit 231 may include a first resistor R1, and the second discharge unit 232 may include a second resistor R2. The resistance values ​​of the first resistor R1 and the second resistor R2 may be the same or similar, and the first resistor R1 and the second resistor R2 need to withstand the corresponding peak impulse voltage and instantaneous power when selected.

[0049] It should be noted that the inclusion of a resistor in both the first discharge unit 231 and the second discharge unit 232 is only one embodiment. The first discharge unit 231 and the second discharge unit 232 may also include multiple resistors, which are arranged in series and parallel in the circuit. If the first discharge unit 231 and the second discharge unit 232 include multiple resistors, the specifications and requirements for the resistors of the first discharge unit 231 and the second discharge unit 232 are consistent with the requirements for the first resistor R1 and the second resistor R2, and will not be elaborated further here.

[0050] Continue to refer to Figure 4 In some embodiments, the absorption unit 234 includes a first capacitor C1. One end of the first capacitor C1 is connected between the anti-reverse module 220 and the load, and the other end of the first capacitor C1 is connected between a first resistor R1 and a second resistor R2.

[0051] It should be noted that the first capacitor C1 can be a commercially available film capacitor, ceramic capacitor, etc., the capacitance of which is usually much smaller than that of an electrolytic capacitor. Furthermore, the inclusion of one capacitor in the absorption unit 234 is only one embodiment; the absorption unit 234 can also include multiple capacitors, arranged in series and parallel in the circuit. If the absorption unit 234 includes multiple capacitors, the specifications and other requirements of each capacitor in the absorption unit 234 are the same as those of the first capacitor C1, and will not be repeated here.

[0052] Continue to refer to Figure 4 In some embodiments, the discharge switch unit 233 includes a switch transistor S1; the two ends of the switch transistor S1 are respectively connected to the second discharge unit 232 and the second node N2. Specifically, one end of the switch transistor S1 can be connected to the second resistor R2, and the other end of the switch transistor S1 can be connected to the second node N2. The switch transistor S1 is closed and opened by a drive circuit.

[0053] It should be noted that the switching transistor S1 can be a MOSFET, IGBT, or other switching transistors; no specific limitation is made to the switching transistor S1 here.

[0054] In this embodiment, the first resistor R1 and the second resistor R2 are both resistors used for discharging in a conventional charging module. In this embodiment, one end of the first capacitor C1, which is used to absorb voltage spikes, is directly connected between the first resistor R1 and the second resistor R2 to form a composite circuit with a shared resistor.

[0055] Taking the first resistor R1, the second resistor R2, the first capacitor C1, and the switching transistor S1 as examples, the working principle of the discharge absorption module 230 is as follows: After the charging module stops operating, the switching transistor S1 can be closed first, so that the first resistor R1 and the second resistor R2 are connected in parallel across the output electrolytic module 210. The electrolytic capacitor in the output electrolytic module 210 can discharge to the first resistor R1 and the second resistor R2, making its voltage approximately 0V. During the discharge process, since the capacitance of the first capacitor C1 is much smaller than that of the electrolytic capacitor in the output electrolytic module 210, the first capacitor C1 will not divide the voltage of the electrolytic capacitor. When the discharge ends and the switching transistor S1 remains closed, since the capacitance of the electrolytic capacitor is much larger than that of the first capacitor C1, the branch where the output electrolytic module 210 is located can be considered as equivalent to a short circuit. The first resistor R1 and the second resistor R2 are equivalent to a parallel structure, and are connected in series with the first capacitor C1 and then in parallel across the anti-reverse module 220. When the contactor K1-1 between the DC converter circuit 200 and the load closes, a large current voltage pulse enters the DC converter circuit 200. At this moment, the first resistor R1 and the second resistor R2 act as absorption resistors, working together with the first capacitor C1 to absorb the current and voltage spikes of the anti-reverse module 220.

[0056] When the switch S1 is in the off state, the first resistor R1 continues to act as an absorption resistor, connected in series with the first capacitor C1 and then in parallel across the anti-reverse module 220 to absorb current and voltage spikes in the anti-reverse module 220. Simultaneously, the first resistor R1 still functions as a damping absorption resistor. By converting electrical energy into heat energy, the first resistor R1 dissipates energy, thus providing a damping effect and suppressing oscillations and transient responses in the circuit.

[0057] Figure 5 This is the third structural schematic diagram of the charging module according to an embodiment of this application. Figure 5 As shown, in some embodiments, the output electrolysis module 210 includes a second capacitor C2, a third capacitor C3, and a first inductor L1.

[0058] In this configuration, one end of the second capacitor C2 is connected to one end of the primary coil of the first inductor L1, the other end of the second capacitor C2 is connected to one end of the third capacitor C3, the other end of the third capacitor C3 is connected to the other end of the primary coil of the first inductor L1, and the secondary side of the first inductor L1 is connected between the first node N1 and the second node N2.

[0059] It should be noted that the number of electrolytic capacitors in the output electrolytic module 210 can be set according to actual needs, or determined according to the number of rectifier bridges in the DC conversion circuit 200. For example, one set of rectifier bridges can correspond to one electrolytic capacitor. This embodiment takes the DC conversion circuit 200 including two sets of rectifier bridges and the output electrolytic module 210 including two electrolytic capacitors as an example to describe the structure of the DC conversion circuit 200 in detail.

[0060] In this embodiment, both the second capacitor C2 and the third capacitor C3 can be electrolytic capacitors, and the first inductor L1 is a common-mode inductor. Each electrolytic capacitor is used to filter out high-frequency noise in the output voltage of the corresponding rectifier bridge. Specifically, the second capacitor C2 and the third capacitor C3 can be connected in parallel on the output side of the two rectifier bridges. One end of the second capacitor C2 can be connected to one end of the primary winding of the first inductor L1, and the other end of the second capacitor C2 can be connected to one end of the third capacitor C3. The other end of the third capacitor C3 can be connected to the other end of the primary winding of the first inductor L1. The secondary side of the first inductor L1 is connected between the first node N1 and the second node N2.

[0061] The common-mode inductor (i.e., the first inductor L1) is placed after the electrolytic capacitor. Its main function is to suppress common-mode noise, thereby improving the electromagnetic compatibility and stability of the circuit.

[0062] It should be noted that the connection method and setting position of the output electrolysis module 210 and the anti-reverse module 220 can be adjusted according to actual needs. This is just an example. For example, the first inductor L1 can also be placed between the anti-reverse module 220 and the load.

[0063] In this embodiment, the anti-reverse module 220 includes at least one anti-reverse diode Dx. The anti-reverse module 220 can have various topologies. Two examples are given below to illustrate two topologies of the anti-reverse module 220. Other structures can be set according to requirements.

[0064] Figure 6 This is the fourth structural schematic diagram of the charging module according to an embodiment of this application. Figure 6 As shown, in some embodiments, when the anti-reverse module 220 includes an anti-reverse diode Dx, the anode of the anti-reverse diode Dx is connected to the first node N1, and the cathode of the anti-reverse diode Dx is connected to the load.

[0065] Specifically, if the anti-reverse module 220 includes only one anti-reverse diode Dx, the anode of the anti-reverse diode Dx can be connected to the first node N1, and the cathode of the anti-reverse diode Dx can be connected to the positive terminal of the load. Thus, the anti-reverse diode Dx can prevent the high voltage of the downstream load from being directly connected, causing the output electrolytic capacitor to burst.

[0066] Figure 7 This is the fifth schematic diagram of the charging module in an embodiment of this application. Figure 7 As shown, in some embodiments, when the anti-reverse module 220 includes two anti-reverse diodes Dx, the anode of one anti-reverse diode Dx is connected to the first node N1, the cathode of the anti-reverse diode Dx is connected to the anode of the other anti-reverse diode Dx, and the cathode of the other anti-reverse diode Dx is connected to the load.

[0067] Specifically, if the anti-reverse module 220 includes only two anti-reverse diodes Dx, the anode of one anti-reverse diode Dx is connected to the first node N1, the cathode of this anti-reverse diode Dx is connected to the anode of the other anti-reverse diode Dx, and the cathode of the other anti-reverse diode Dx is connected to the positive terminal of the load. Thus, by connecting the two anti-reverse diodes Dx in series, the voltage withstand capability of the anti-reverse module 220 can be increased, better preventing the output electrolytic capacitor from bursting due to direct high voltage input from the downstream load.

[0068] Continue to refer to Figure 6 In some embodiments, the DC conversion circuit 200 further includes a first transformer T1, a second transformer T2, a first rectifier unit, and a second rectifier unit.

[0069] In this circuit, the primary winding of the first transformer T1 is connected to the AC conversion circuit 100, and the secondary winding of the first transformer T1 is connected to the first rectifier unit. The first output terminal S1 of the first rectifier unit is connected to one end of the second capacitor C2, and the second output terminal S2 of the first rectifier unit is connected between the second capacitor C2 and the third capacitor C3. Similarly, the primary winding of the second transformer T2 is connected to the AC conversion circuit 100, and the secondary winding of the second transformer T2 is connected to the second rectifier unit. The first output terminal X1 of the second rectifier unit is connected between the second capacitor C2 and the third capacitor C3, and the second output terminal X2 of the second rectifier unit is connected to one end of the third capacitor C3.

[0070] It should be noted that the first rectifier unit and the second rectifier unit are the rectifier bridges in the above embodiments.

[0071] Taking a DC-DC converter circuit 200 comprising two rectifier bridges (a first rectifier unit and a second rectifier unit) as an example, the primary windings of both the first transformer T1 and the second transformer T2 are connected to the AC-DC converter circuit 100. The secondary winding of the first transformer T1 is connected to the first rectifier unit, and the secondary winding of the second transformer T2 is connected to the second rectifier unit. Both the first and second rectifier units include two output terminals. The first output terminal S1 of the first rectifier unit is connected to the second capacitor C2, and the second output terminal S2 of the first rectifier unit is connected between the second capacitor C2 and the third capacitor C3. The first output terminal X1 of the second rectifier unit is connected between the second capacitor C2 and the third capacitor C3, and the second output terminal X2 of the second rectifier unit is connected to one end of the third capacitor C3. That is, the second capacitor C2 is connected in parallel between the first output terminal S1 and the second output terminal of the first rectifier unit, and the third capacitor C3 is connected in parallel between the first output terminal X1 and the second output terminal of the second rectifier unit.

[0072] Continue to refer to Figure 6 In some embodiments, the first rectifier unit includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4.

[0073] In this configuration, the anode of the first diode D1 is connected to the cathode of the second diode D2 to serve as one input terminal of the first rectifier unit; the anode of the third diode D3 is connected to the cathode of the fourth diode D4 to serve as another input terminal of the first rectifier unit; the cathode of the first diode D1 is connected to the cathode of the third diode D3 to serve as the first output terminal S1 of the first rectifier unit; and the anode of the second diode D2 is connected to the anode of the fourth diode D4 to serve as the second output terminal S2 of the first rectifier unit.

[0074] The second rectifier unit includes the fifth diode D5, the sixth diode D6, the seventh diode D7, and the eighth diode D8.

[0075] The anode of the fifth diode D5 is connected to the cathode of the sixth diode D6 and serves as one input terminal of the second rectifier unit. The anode of the seventh diode D7 is connected to the cathode of the eighth diode D8 and serves as the other input terminal of the second rectifier unit. The cathode of the fifth diode D5 is connected to the cathode of the seventh diode D7 and serves as the first output terminal X1 of the second rectifier unit. The anode of the sixth diode D6 is connected to the anode of the eighth diode D8 and serves as the second output terminal X2 of the second rectifier unit.

[0076] Specifically, one end of the secondary winding of the first transformer T1 is connected between the first diode D1 and the second diode D2, serving as one input terminal of the first rectifier unit; the other end of the secondary winding of the first transformer T1 is connected between the third diode D3 and the fourth diode D4, serving as another input terminal of the first rectifier unit. One end of the secondary winding of the second transformer T2 is connected between the fifth diode D5 and the sixth diode D6, serving as one input terminal of the second rectifier unit; the other end of the secondary winding of the second transformer T2 is connected between the seventh diode D7 and the eighth diode D8, serving as another input terminal of the second rectifier unit.

[0077] In some embodiments, the DC conversion circuit 200 further includes a switching module 240, which includes a first switching unit and a second switching unit.

[0078] The first switching unit is connected in parallel between the first output terminal S1 of the first rectifier unit and the first output terminal X1 of the second rectifier unit. The second switching unit is connected in parallel between the second output terminal S2 of the first rectifier unit and the second output terminal X2 of the second rectifier unit.

[0079] Specifically, the first switching unit is located between the first rectifier unit and the second capacitor C2, and is connected in parallel between the first output terminal S1 of the first rectifier unit and the first output terminal X1 of the second rectifier unit. The second switching unit is located between the second rectifier unit and the third capacitor C3, and is connected in parallel between the second output terminal S2 of the first rectifier unit and the second output terminal X2 of the second rectifier unit. By closing, closing, and switching the first and second switching units, different power outputs can be provided to the load.

[0080] In this embodiment, the switch module 240 can be disposed between the output electrolysis module 210 and the transformer-rectifier module, or between the output electrolysis module 210 and the reverse protection module 220. The structure of the switch module 240 can be a combination of multiple relays. The switch module 240 will be described in detail below through two examples.

[0081] Continue to refer to Figure 6As an example, the switch module 240 may include a first switch unit, a second switch unit, and a third switch unit, wherein the first switch unit includes a first relay K1, the second switch unit includes a second relay K2, and the third switch unit includes a third relay K3 and a fourth relay K4.

[0082] Specifically, one end of the first relay K1 is connected to the first output terminal S1 of the first rectifier unit, and the other end of the first relay K1 is connected to the first output terminal X1 of the second rectifier unit. One end of the second relay K2 is connected to the second output terminal S2 of the first rectifier unit, and the other end of the second relay K2 is connected to the second output terminal X2 of the second rectifier unit. One end of the third relay K3 is connected to the second output terminal S2 of the first rectifier unit, and the other end of the third relay K3 is connected between the second capacitor C2 and the third capacitor C3. One end of the fourth relay K4 is connected to the first output terminal X1 of the second rectifier unit, and the other end of the fourth relay K4 is connected between the second capacitor C2 and the third capacitor C3.

[0083] Continue to refer to Figure 7 As another example, the switch module 240 may include a first switch unit, a second switch unit, and a third switch unit, wherein the first switch unit includes a first relay K1, the second switch unit includes a second relay K2, and the third switch unit may include a third relay K3.

[0084] In this configuration, one end of the first relay K1 is connected to the first output terminal S1 of the first rectifier unit, and the other end of the first relay K1 is connected to the first output terminal X1 of the second rectifier unit. One end of the second relay K2 is connected to the second output terminal S2 of the first rectifier unit, and the other end of the second relay K2 is connected to the second output terminal X2 of the second rectifier unit. One end of the third relay K3 is connected to the second output terminal S2 of the first rectifier unit, and the other end of the third relay K3 is connected to the first output terminal X1 of the second rectifier unit. Simultaneously, the two ends of the third relay K3 are also connected between the second capacitor C2 and the third capacitor C3.

[0085] Therefore, without changing the original common-ground non-isolated drive, by shorting the first capacitor C1 between multiple series-connected discharge resistors, both a discharge effect and absorption resistors can be used to absorb voltage spikes applied by the anti-reverse module 220. Simultaneously, the closing and opening of the switch S1 do not affect the absorption effect, and the first resistor R1 still provides damping absorption. Thus, while ensuring the damping suppression effect of the discharge resistors, the cost of the charging module can be effectively reduced, and the reliability of the charging module can be improved.

[0086] Based on the above embodiments, this application also provides a charging system, which may include multiple charging modules as described above.

[0087] It should be noted that for details not disclosed in the charging system of this embodiment, please refer to the details disclosed in the embodiments of the charging module in this specification, which will not be repeated here.

[0088] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A charging module, characterized in that, It includes an AC conversion circuit and at least one set of DC conversion circuits connected to the AC conversion circuit, wherein the DC conversion circuit includes an output electrolysis module, an anti-reverse module, and a discharge absorption module; One end of the anti-reverse module is connected to one end of the output electrolysis module to form a first node, the other end of the anti-reverse module is connected to the load, and the other end of the output electrolysis module is connected to the load to form a second node; The discharge absorption module includes a first discharge unit, a second discharge unit, a discharge switch unit, and an absorption unit. The first discharge unit and the second discharge unit are connected in series and then in parallel between the first node and the second node. One end of the absorption unit is connected between the anti-reverse module and the load, and the other end of the absorption unit is connected between the first discharge unit and the second discharge unit. The discharge switch unit is connected between the second discharge unit and the second node. The first discharge unit and the second discharge unit are both composed of resistors, and the absorption unit is composed of capacitors.

2. The charging module according to claim 1, characterized in that, The first discharge unit includes a first resistor, and the second discharge unit includes a second resistor; One end of the first resistor is connected to the first node, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is connected to the discharge switch unit.

3. The charging module according to claim 2, characterized in that, The absorption unit includes a first capacitor; One end of the first capacitor is connected between the anti-reverse module and the load, and the other end of the first capacitor is connected between the first resistor and the second resistor.

4. The charging module according to any one of claims 1 to 3, characterized in that, The discharge switch unit includes a switching transistor; The two ends of the switching transistor are respectively connected to the second discharge unit and the second node.

5. The charging module according to any one of claims 1 to 3, characterized in that, The output electrolysis module includes a second capacitor, a third capacitor, and a first inductor; One end of the second capacitor is connected to one end of the primary coil of the first inductor, the other end of the second capacitor is connected to one end of the third capacitor, the other end of the third capacitor is connected to the other end of the primary coil of the first inductor, and the secondary side of the first inductor is connected between the first node and the second node.

6. The charging module according to any one of claims 1 to 3, characterized in that, The anti-reverse module includes at least one anti-reverse diode; When the anti-reverse module includes one anti-reverse diode, the anode of the anti-reverse diode is connected to the first node, and the cathode of the anti-reverse diode is connected to the load; In the case where the anti-reverse module includes two anti-reverse diodes, the anode of one anti-reverse diode is connected to the first node, the cathode of the anti-reverse diode is connected to the anode of the other anti-reverse diode, and the cathode of the other anti-reverse diode is connected to the load.

7. The charging module according to claim 5, characterized in that, The DC conversion circuit further includes a first transformer, a second transformer, a first rectifier unit, and a second rectifier unit; The primary side of the first transformer is connected to the AC conversion circuit, the secondary side of the first transformer is connected to the first rectifier unit, the first output terminal of the first rectifier unit is connected to one end of the second capacitor, and the second output terminal of the first rectifier unit is connected between the second capacitor and the third capacitor. The primary side of the second transformer is connected to the AC conversion circuit, the secondary side of the second transformer is connected to the second rectifier unit, the first output terminal of the second rectifier unit is connected between the second capacitor and the third capacitor, and the second output terminal of the second rectifier unit is connected to one end of the third capacitor.

8. The charging module according to claim 7, characterized in that, The first rectifier unit includes a first diode, a second diode, a third diode, and a fourth diode; The anode of the first diode is connected to the cathode of the second diode to serve as one input terminal of the first rectifier unit. The anode of the third diode is connected to the cathode of the fourth diode to serve as another input terminal of the first rectifier unit. The cathode of the first diode is connected to the cathode of the third diode to serve as the first output terminal of the first rectifier unit. The anode of the second diode is connected to the anode of the fourth diode to serve as the second output terminal of the first rectifier unit. The second rectifier unit includes a fifth diode, a sixth diode, a seventh diode, and an eighth diode; The anode of the fifth diode is connected to the cathode of the sixth diode and serves as one input terminal of the second rectifier unit. The anode of the seventh diode is connected to the cathode of the eighth diode and serves as another input terminal of the second rectifier unit. The cathode of the fifth diode is connected to the cathode of the seventh diode and serves as the first output terminal of the second rectifier unit. The anode of the sixth diode is connected to the anode of the eighth diode and serves as the second output terminal of the second rectifier unit.

9. The charging module according to claim 7, characterized in that, The DC conversion circuit further includes a switching module, which includes a first switching unit and a second switching unit. The first switching unit is connected in parallel between the first output terminal of the first rectifier unit and the first output terminal of the second rectifier unit; The second switching unit is connected in parallel between the second output terminal of the first rectifier unit and the second output terminal of the second rectifier unit.

10. A charging system, characterized in that, It includes at least one charging module as described in any one of claims 1 to 9.

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