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 protection module. One end of the anti-reverse module is connected with the positive end of the load to form a first node, the other end of the anti-reverse module is connected with one end of the output electrolysis module, the other end of the output electrolysis module is connected with the negative end of the load to form a second node, and the anti-reverse module is used for preventing high voltage of the load from reversely flowing to the charging module; the protection module is connected between the first node and the second node, and the impedance of the protection module is smaller than that of the anti-reverse module. Therefore, the stability of the anti-reverse diode circuit is improved, and the reliability of the charging module is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging, in particular to a charging module and a charging system. BACKGROUND

[0002] With the rapid development of electric vehicles, the layout of charging infrastructure is expanding, and the reliability and user-friendliness of charging modules, as the core components of charging stations and charging piles, are widely concerned. At present, the charging modules on the market are usually composed of a PFC (power factor correction) part and a DC / DC part. An anti-reverse diode circuit is generally arranged at the output end of the DC / DC part, which is connected with the load through the anti-reverse diode circuit to prevent the high voltage of the load from being directly connected to the DC / DC part, so as to prevent the electrolytic capacitor in the DC / DC part from exploding.

[0003] However, in the actual application process, when the contactor between the load and the DC / DC part is closed, the load line between the load and the DC / DC part is too long, resulting in self-induction of the line, so that the reverse voltage peak applied to the anti-reverse diode circuit is high, which may cause damage to the anti-reverse diode. When the anti-reverse diode circuit is damaged or defective, high voltage may be directly applied to the large-capacity electrolytic capacitor at the output end of the DC / DC part, causing the electrolytic capacitor to be damaged due to overvoltage, and further causing serious faults such as fire and explosion, resulting in secondary failure of the module. Therefore, improving the reliability of the charging module, especially the stability of the anti-reverse diode circuit, has become a problem to be solved at present. CONTENT OF THE UTILITY MODEL

[0004] The main purpose of the present application is to provide a charging module and a charging system to improve the stability of the anti-reverse diode circuit and the reliability of the charging module.

[0005] To achieve the above purpose, the present application provides a charging module, which comprises an AC conversion circuit and at least one group of DC conversion circuits connected with the AC conversion circuit, wherein the DC conversion circuit comprises an output electrolysis module, an anti-reverse module and a protection module.

[0006] One end of the anti-reverse module is connected with the positive end of the load and forms a first node, the other end of the anti-reverse module is connected with one end of the output electrolysis module, the other end of the output electrolysis module is connected with the negative end of the load and forms a second node, and the anti-reverse module is used to prevent high voltage of the load from being backfed to the charging module.

[0007] The protection module is connected between the first node and the second node, and the impedance of the protection module is smaller than that of the anti-reverse module.

[0008] Optionally, the protection module comprises a first diode, a first capacitor and a first resistor; an anode of the first diode is connected with the first node, a cathode of the first diode is connected with one end of the first capacitor, the other end of the first capacitor is connected with the second node; the first resistor is connected in parallel across the first capacitor.

[0009] Optionally, the protection module further comprises a second resistor, one end of the second resistor is connected with the first capacitor, the other end of the second resistor is connected with the second node.

[0010] Optionally, the protection module further comprises a second diode; an anode of the second diode is connected with a cathode of the first diode, a cathode of the second diode is connected with the second node; or, an anode of the second diode is connected with a cathode of the first diode, a cathode of the second diode is connected with one end of the second resistor.

[0011] Optionally, the protection module further comprises a third resistor; one end of the third resistor is connected with the cathode of the first diode, the other end of the third resistor is connected with the second node; or, one end of the third resistor is connected with the cathode of the first diode, the other end of the third resistor is connected with one end of the second resistor.

[0012] Optionally, the DC conversion circuit further comprises a voltage transformation and rectification module, the voltage transformation and rectification module comprises a first end, a second end, a third end and a fourth end; the output electrolysis module comprises a second capacitor, a third capacitor and a first inductor; one end of the second capacitor is connected with the first end of the voltage transformation and rectification module and forms a third node, the other end of the second capacitor is connected with one end of the third capacitor, the other end of the third capacitor is connected with the fourth end of the voltage transformation and rectification module and forms a fourth node; the second end and the third end of the voltage transformation and rectification module are connected between the second capacitor and the third capacitor; a primary side of the first inductor is connected between the third node and the fourth node, a secondary side of the first inductor is connected between the anti-reverse module and the second node.

[0013] Optionally, the anti-reverse module comprises at least one anti-reverse diode; in the case that the anti-reverse module comprises one anti-reverse diode, the anode of the anti-reverse diode is connected with the secondary side of the first inductor, and the cathode of the anti-reverse diode is connected with the first node; in the case that the anti-reverse module comprises two anti-reverse diodes, the two anti-reverse diodes are connected in series between the secondary side of the first inductor and the first node; or, the anode of one anti-reverse diode is connected with the first end of the voltage transformation and rectification module, the anode of the other anti-reverse diode is connected with the third end of the voltage transformation and rectification module, and the cathodes of the two anti-reverse diodes are both connected with the first node.

[0014] Optionally, the voltage transformation and rectification module comprises a first transformer, a second transformer, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode, an eighth diode, a ninth diode and a twelfth diode; the primary side of the first transformer and the primary side of the second transformer are connected with the AC conversion circuit respectively; the anode of the third diode is connected with the cathode of the fourth diode, the anode of the fifth diode is connected with the cathode of the sixth diode, the cathodes of the third diode and the fifth diode are connected to serve as the first end of the voltage transformation and rectification module, the anode of the fourth diode is connected with the anode of the sixth diode to serve as the second end of the voltage transformation and rectification module; the anode of the seventh diode is connected with the cathode of the eighth diode, the anode of the ninth diode is connected with the cathode of the twelfth diode, the cathodes of the seventh diode and the ninth diode are connected to serve as the third end of the voltage transformation and rectification module, the anode of the eighth diode is connected with the anode of the twelfth diode to serve as the fourth end of the voltage transformation and rectification module; one end of the secondary side coil of the first transformer is connected between the third diode and the fourth diode, the other end of the secondary side coil of the first transformer is connected between the fifth diode and the sixth diode, one end of the secondary side coil of the second transformer is connected between the seventh diode and the eighth diode, the other end of the secondary side coil of the second transformer is connected between the ninth diode and the twelfth diode.

[0015] Optionally, the DC conversion circuit further comprises a switching module, and the switching module comprises a first switching unit and a second switching unit; the first switching unit is connected in parallel between the first end and the third end of the voltage transformation and rectification module, and the second switching unit is connected in parallel between the second end and the fourth end of the voltage transformation and rectification module.

[0016] In addition, in order to achieve the above-mentioned purpose, the application further provides a charging system, characterized by comprising at least one charging module as described above.

[0017] The charging module of the application increases the protection module in the DC conversion circuit, the protection module is in parallel with the anti-reverse module and the output electrolysis module, and the impedance of the protection module is smaller than that of the anti-reverse module. When the relay between the load and the charging module is closed, the load will input a reverse voltage to the DC conversion circuit. Since the impedance of the protection module is smaller than that of the anti-reverse module, the reverse current of the protection module will be greater than that of the anti-reverse module, thereby achieving the purpose of absorbing high-voltage peaks, ensuring the safety and stability of the anti-reverse module, and improving the reliability of the charging module. BRIEF DESCRIPTION OF DRAWINGS

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

[0019] Figure 2 is one of the structural schematic diagrams of the charging module of the embodiment of the application;

[0020] Figure 3 is the second structural schematic diagram of the charging module of the embodiment of the application;

[0021] Figure 4 is the third structural schematic diagram of the charging module of the embodiment of the application;

[0022] Figure 5 is the fourth structural schematic diagram of the charging module of the embodiment of the application;

[0023] Figure 6 is the fifth structural schematic diagram of the charging module of the embodiment of the application;

[0024] Figure 7 is the sixth structural schematic diagram of the charging module of the embodiment of the application;

[0025] Figure 8 is the seventh structural schematic diagram of the charging module of the embodiment of the application;

[0026] Figure 9 is the eighth structural schematic diagram of the charging module of the embodiment of the application;

[0027] Figure 10 is the ninth structural schematic diagram of the charging module of the embodiment of the application;

[0028] In the figure, 100, AC conversion circuit; 200, DC conversion circuit; 210, output electrolysis module; 220, anti-reverse module; 230, protection module; 240, voltage conversion and rectification module; 250, switch module.

[0029] The implementation, functional features and advantages of the application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0031] The structural composition of the charging module can be divided into two main parts: a PFC (power factor correction) part and a DC / DC conversion part. In the DC / DC conversion part, the output end is generally designed as an upper and lower two-way output, including a rectifier circuit, a large-capacity electrolytic capacitor circuit, a relay combination circuit and an anti-reverse diode circuit.

[0032] Specifically, the rectifier circuit is responsible for converting the alternating current and voltage from the primary side into fluctuating direct current; the large-capacity electrolytic capacitor is used to filter out high-frequency noise and stabilize the output voltage; the relay combination circuit realizes the series or parallel connection of the high and low two-way output circuits by controlling the opening and closing of the relay, thereby providing a wide range of output voltages to adapt to different load requirements; the anti-reverse diode circuit is to prevent the output electrolytic capacitor from being damaged due to the direct connection of the high voltage of the subsequent load. However, when the anti-reverse diode fails, the electrolytic capacitor may be damaged due to the direct action of the external high voltage on the electrolytic capacitor, and in severe cases, it may even cause a fire or explosion, resulting in the failure of the charging module.

[0033] Figure 1 is a structural schematic diagram of a charging module according to an example of the present application. As shown in Figure 1 Generally, the DC conversion circuit output end of the charging module has an anti-reverse diode circuit, and a parasitic capacitor C1-6 exists at the anti-reverse diode circuit. It should be noted that the parasitic capacitor refers to the capacitive effect that is not intentionally designed but actually exists in an electronic circuit. When the contactor between the load and the DC conversion circuit is closed, the positive end of the load battery outputs a reverse current to the charging module, the reverse current passes through the parasitic capacitor C1-6 of the anti-reverse diode circuit, and then flows into the two electrolytic capacitors through the common-mode inductor. The direction current again passes through the common-mode inductor and returns to the negative end of the load battery.

[0034] In this process, due to the existence of the parasitic capacitor C1-6, the output voltage of the charging module is reduced, and the output current is increased. As a result, the output power of the charging module is reduced, and the charging efficiency is reduced. Figure 1The length of the power supply line between the cathode of the anti-reverse diode and the anode of the anti-reverse diode is usually between tens of meters and dozens of meters, and the positive and negative power supply lines are arranged in a round trip, which generates a large equivalent inductance on the power supply line. In addition, the difference mode component in the common mode inductance also increases the inductance in the circuit, which further increases the equivalent inductance on the power supply line after being superimposed with the original difference mode inductance. In addition, the parasitic inductance effect in the internal wiring path of the PCB, these factors together, when the contactor between the load and the charging module is closed, a huge voltage impact will be brought to the anti-reverse diode. This high-voltage transient impact may cause the anti-reverse diode to fail or be damaged.

[0035] It can be understood that, since the capacitance of the electrolytic capacitor is much larger than the capacitance of the parasitic capacitor C1-6 of the anti-reverse diode, the capacitive reactance of the parasitic capacitor C1-6 is greater than the capacitive reactance of the electrolytic capacitor, and the anti-reverse diode and the electrolytic capacitor are in series connection structure, so when the contactor between the load and the charging module is closed, the voltage division of the anti-reverse diode will be greater, thereby the reverse voltage peak applied to the anti-reverse diode will be high, which will cause the anti-reverse diode to be damaged. The function of the anti-reverse diode is originally to prevent the high voltage of the load from being applied to the electrolytic capacitor with a withstand voltage of 500V or 525V when the high voltage of the load is connected, so as to avoid the electrolytic capacitor from exploding and being damaged; but once the anti-reverse diode is damaged and directly connected, the high voltage of the external battery is directly applied to the electrolytic capacitor, the capacitor explodes, the electrolyte splashes, and even the capacitor catches fire, resulting in poor safety and customer experience of the charging module.

[0036] As shown in Figure 1 , a common anti-reverse diode protection circuit currently is that an RC absorption circuit (i.e. a combination circuit of a resistor and a capacitor) is connected in parallel across the anti-reverse diode, so that the RC absorption circuit absorbs the high voltage peak applied to the anti-reverse diode. However, since the capacitance of the electrolytic capacitor is usually much larger than that of the ordinary capacitor, even if an RC absorption circuit is added, the capacitance of the tile capacitor group in the RC absorption circuit is much smaller than that of the output electrolytic capacitor, resulting in poor voltage peak absorption effect. In addition, another anti-reverse diode protection circuit is that two high-voltage anti-reverse diodes are used in series to increase the withstand voltage of the output anti-reverse diode circuit. However, the cost of high-voltage and high-current diodes is high, which increases the overall cost of the charging module, and at the same time, the efficiency of the entire charging module is also reduced, and in order to dissipate heat for the anti-reverse diode, a larger heat sink needs to be added, thereby occupying the effective space of the charging module.

[0037] Therefore, based on this, the embodiment of the present application provides a charging module and a charging system, by adding the protection module provided in the embodiment to the charging module, the high voltage peak of the anti-reverse module is effectively absorbed, the function of better protecting the anti-reverse module is played, the safety and stability of the anti-reverse module are improved, and the reliability of the charging module is improved.

[0038] Figure 2 is a structural schematic diagram of a charging module of an embodiment of the present application. As shown in the figure, the charging module can include an AC conversion circuit 100 and at least one group of DC conversion circuits 200 connected with the AC conversion circuit 100. The DC conversion circuit 200 can include an output electrolytic module 210, an anti-reverse module 220 and a protection module 230. Figure 2

[0039] One end of the anti-reverse module 220 is connected with the positive end of the load and forms a first node N1, the other end of the anti-reverse module 220 is connected with one end of the output electrolytic module 210, the other end of the output electrolytic module 210 is connected with the negative end of the load and forms a second node N2, and the anti-reverse module 220 is used to prevent high voltage of the load from being back fed to the charging module. The protection module 230 is connected between the first node N1 and the second node N2, and the impedance of the protection module 230 is smaller than that of the anti-reverse module 220.

[0040] First of all, it should be noted that the circuit structure of the charging module is usually composed of a front-stage PFC (i.e. the AC conversion circuit 100 in the embodiment) part and a DC / DC conversion part (i.e. the DC conversion circuit 200 in the embodiment). The AC conversion circuit 100 rectifies the input three-phase mains (i.e. the A phase, B phase and C phase in the figure) into a direct current of about ±420V, with a total voltage of 840V. Further, the direct current is output after being stabilized and filtered by a large-capacity electrolytic capacitor. The DC conversion circuit 200 converts and outputs through two or more LLC resonant cavities, and realizes a wide range output from low voltage 50V to high voltage 1000V through the series and parallel combination of switches at the output end. Figure 2

[0041] In the embodiment, the output electrolytic module 210 in the DC conversion circuit 200 can be composed of a plurality of large-capacity electrolytic capacitors. The output electrolytic module 210 can stabilize and filter the direct current output by the front-stage AC conversion circuit 100, so as to output the stabilized and filtered direct current to the load. The anti-reverse module 220 can be arranged at the output side of the DC conversion circuit 200, specifically between the output electrolytic module 210 and the load, and is mainly used to prevent the high voltage of the rear-stage load from being directly connected, so as to prevent the output electrolytic module 210 from being damaged and disabled. The anti-reverse module 220 can be composed of a plurality of anti-reverse diodes. Further, the protection module 230 is mainly used to protect the anti-reverse module 220 from being disabled due to high voltage spikes. The protection module 230 can be arranged between the anti-reverse module 220 and the load, so as to absorb the electrical energy input from the load side.

[0042] ​​Specifically, the anti-reverse module 220 is connected in series with the output electrolytic module 210 and connected at both ends of the load, one end of the protection module 230 is connected with the first node N1, and the other end of the protection module 230 is connected with the second node N2, at this time, the protection module 230 is equivalent to being connected in parallel with the anti-reverse module 220 and the output electrolytic module 210. In the embodiment, the protection module 230 can be composed of electronic components capable of providing impedance, for example, resistors, capacitors, semiconductor devices, etc.

[0043] It can be understood that because the parasitic capacitance C1-6 of the anti-reverse module 220 has a capacitance value much smaller than that of the electrolytic capacitor in the output electrolytic module 210, the impedance of the parasitic capacitance C1-6 of the anti-reverse module 220 is relatively larger, and therefore, the impedance of the anti-reverse module 220 and the output electrolytic module 210 is mainly determined by the parasitic capacitance C1-6 of the anti-reverse module 220. When any electronic component with an impedance smaller than that of the parasitic capacitance C1-6 is added in the protection module 230, the impedance of the protection module 230 is smaller than that of the series circuit composed of the anti-reverse module 220 and the output electrolytic module 210. When the load K1-1 is closed and a large current voltage pulse enters the charging module, because the impedance of the protection module 230 is smaller, the current flowing into the protection module 230 is relatively larger, thereby better absorbing the voltage and current spikes from the outside, achieving the function of bypassing the voltage and current spikes from the outside, and thus, the function of protecting the anti-reverse module 220 is achieved.

[0044] It is worth mentioning that because the protection module 230 provided in the embodiment is arranged between the anti-reverse module 220 and the load, i.e., at 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 does not affect the absorption function and effect of the protection module 230, and therefore, the protection module 230 provided in the embodiment can be used in any topology of charging module.

[0045] In addition, it also needs to be explained that the charging module in the embodiment can include multiple DC conversion circuits 200, and the structure of each DC conversion circuit 200 can be the same or different. The more the DC conversion circuits 200 of the charging module, the higher the working efficiency, flexibility and stability of the charging module.

[0046] Each DC conversion circuit 200 is connected with the AC conversion circuit 100 and the load, and each DC conversion circuit 200 can have multiple rectifier bridges (i.e., the voltage transformation and rectification module 240 described in subsequent embodiments), and in the embodiment, the number of rectifier bridges in each DC conversion circuit 200 is even, and the number of rectifier bridges is at least two. Each rectifier bridge is connected with the output electrolytic module 210, and the rectifier bridge is used to rectify the alternating current output by the AC conversion circuit 100 and output fluctuating direct current.

[0047] The following sections will provide a detailed introduction to each module in the DC conversion circuit 200.

[0048] Figure 3 This is a second structural schematic diagram of the charging module according to an embodiment of this application. Figure 3 As shown, the protection module 230 includes a first diode D1, a first capacitor C1, and a first resistor R1. The anode of the first diode D1 is connected to the first node N1, the cathode of the first diode D1 is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is connected to the second node N2. The first resistor R1 is connected in parallel across the two ends of the first capacitor C1.

[0049] Specifically, the protection module 230 can be composed of a first diode D1, a first capacitor C1, and a first resistor R1, with the capacitance of the first capacitor C1 being greater than the capacitance of the parasitic capacitance C1-6 of the reverse protection module 220. Since the capacitance of the first capacitor C1 is greater than that of the parasitic capacitance C1-6, and capacitance is inversely proportional to impedance, the impedance of the first capacitor C1 will be less than that of the parasitic capacitance C1-6. Furthermore, the protection module 230 and the reverse protection module 220 are connected in parallel, and the smaller the impedance of the branch, the greater the current shunt. Therefore, when a large current voltage pulse enters the DC-DC converter circuit 200 at the instant K1-1 between the DC-DC converter circuit 200 and the load is closed, the current flowing through the protection module 230 is larger, thus reducing the current flowing through the reverse protection module 220, thereby absorbing the current and voltage spikes of the reverse protection module 220.

[0050] In this embodiment, the purpose of setting the first diode D1 is to prevent the voltage spike absorbed by the first capacitor C1 from being released back into other modules of the DC-DC converter circuit 200 after the first capacitor C1 absorbs the voltage spike input from the load side, thus ensuring the voltage spike absorption function of the protection module 230. The purpose of setting the first resistor R1 is to allow the first capacitor C1 to release electrical energy into the small loop formed by the first capacitor C1 and the first resistor R1 after absorbing the voltage spike, so that the first resistor R1 can dissipate the electrical energy and allow the first capacitor C1 to continue absorbing voltage spikes.

[0051] In addition, refer to Figure 2 and Figure 3, the presence of the first diode D1 also does not increase the risk of increasing the capacitance of the output side X of the DC conversion circuit 200. Specifically, if the first diode D1 is removed, the first capacitor C1 can be equivalent to the output side X capacitor of the DC conversion circuit 200, which will cause the capacitance of the output side X capacitor of the DC conversion circuit 200 to increase. By adding the first diode D1, the first capacitor C1 is isolated from the output side X capacitor of the DC conversion circuit 200, so there is no risk of increasing the capacitance of the output side X capacitor of the DC conversion circuit 200.

[0052] Thus, the topology of the first diode D1, the first capacitor C1, and the first resistor R1 in the protection module 230 can effectively absorb the current and voltage spikes of the anti-reverse module 220, and can internally consume the absorbed voltage spikes. Compared with the existing anti-reverse diode protection circuit, the protection module 230 can better protect the anti-reverse diode and effectively improve the stability and reliability of the charging module.

[0053] Figure 4 is a structural schematic diagram of a charging module according to an embodiment of the present application. As shown in Figure 4 In some embodiments, the protection module 230 further includes a second resistor R2, one end of the second resistor R2 being connected to the first capacitor C1, and the other end of the second resistor R2 being connected to the second node N2.

[0054] The protection module 230 can further include a second resistor R2, which is connected in series with the first capacitor C1 and then connected in parallel with the first resistor R1. In this embodiment, the second resistor R2 not only consumes the electrical energy absorbed by the first capacitor C1 together with the first resistor R1, but also adjusts the absorption capacity and speed of the protection module 230.

[0055] Specifically, since the anti-reverse module 220 also has a certain pressure capacity, the protection module 230 does not need to absorb all the current and voltage of the load side input, but can only absorb part of the current and voltage spikes. At this time, the absorption capacity and speed of the protection module 230 can be adjusted by adjusting the resistance value of the second resistor R2. As an example, if the resistance value of the second resistor R2 is set to be small, the absorption capacity and speed of the protection module 230 for voltage spikes will also be small. If the resistance value of the second resistor R2 is set to be large, the absorption capacity and speed of the protection module 230 for voltage spikes will also be large. It should be noted that the resistance value of the second resistor R2 can be set by the staff according to actual needs, which is not limited here.

[0056] In some embodiments, the protection module 230 further comprises a second diode D2. An anode of the second diode D2 is connected to a cathode of the first diode D1, and a cathode of the second diode D2 is connected to the second node N2; or, an anode of the second diode D2 is connected to a cathode of the first diode D1, and a cathode of the second diode D2 is connected to one end of the second resistor R2.

[0057] In the present embodiment, the second diode D2 can be a transient voltage suppression diode. A transient voltage suppression diode (TVS diode) is a semiconductor device used to protect electronic circuits from damage caused by transient voltages such as surge voltage, electrostatic discharge, etc. By adding a transient voltage suppression diode in the protection module 230, the absorption capacity of the protection module 230 can be further increased, and the first capacitor C1 can also be protected, further improving the reliability and stability of the protection module 230.

[0058] Figure 5 Fig. 4 is a structural schematic diagram of a charging module according to an embodiment of the present application, Figure 6 Fig. 5 is a structural schematic diagram of a charging module according to an embodiment of the present application.

[0059] As shown in Figs. 4 and 5, the second diode D2 can be connected in two ways. One is to connect the second diode D2 in parallel directly across the first capacitor C1, and the other is to connect the second diode D2 in parallel across the first capacitor C1 and the second resistor R2. Figure 5 and Figure 6 As shown in Figs. 4 and 5, the second diode D2 can be connected in two ways. One is to connect the second diode D2 in parallel directly across the first capacitor C1, and the other is to connect the second diode D2 in parallel across the first capacitor C1 and the second resistor R2.

[0060] In some embodiments, the protection module 230 further comprises a third resistor R3. One end of the third resistor R3 is connected to the cathode of the first diode D1, and the other end of the third resistor R3 is connected to the second node N2; or, one end of the third resistor R3 is connected to the cathode of the first diode D1, and the other end of the third resistor R3 is connected to one end of the second resistor R2.

[0061] In the embodiment, the third resistor R3 can be a voltage-dependent resistor, which is mainly used to protect the circuit from transient overvoltage (such as surge voltage, lightning, etc.). By adding a voltage-dependent resistor in the protection module 230, the absorption capacity of the protection module 230 can be further increased, and the first capacitor C1 is protected, further improving the reliability and stability of the protection module 230.

[0062] Similarly, the third resistor R3 has two connection modes, one is to connect the third resistor R3 in parallel across the first capacitor C1, and the other is to connect the third resistor R3 in parallel across the first capacitor C1 and the second resistor R2. Specifically, when the protection module 230 does not have the second resistor R2, the third resistor R3 is directly connected in parallel across the first capacitor C1. When the protection module 230 has the second resistor R2, the third resistor R3 can be connected in parallel across the first capacitor C1, or the third resistor R3 can be connected with one end of the first diode D1 and the other end of the second node N2, that is, the third resistor R3 is connected in parallel across the first capacitor C1 and the second resistor R2. The connection mode of the third resistor R3 can refer to the connection mode of the second diode D2 in Figure 5 or Figure 6 , which will not be described here.

[0063] Figure 7 is a structural schematic diagram of a charging module of an embodiment of the application. As Figure 7 shown, in some embodiments, the DC conversion circuit 200 further includes a voltage transformation and rectification module 240, and the voltage transformation and rectification module 240 includes a first end S1, a second end S2, a third end S3, and a fourth end S4. The output electrolytic module 210 includes a second capacitor C2, a third capacitor C3, and a first inductor L1.

[0064] In the embodiment, the third resistor R3 can be a voltage-dependent resistor, which is mainly used to protect the circuit from transient overvoltage (such as surge voltage, lightning, etc.). By adding a voltage-dependent resistor in the protection module 230, the absorption capacity of the protection module 230 can be further increased, and the first capacitor C1 is protected, further improving the reliability and stability of the protection module 230.

[0065] It should be noted that the second capacitor C2 and the third capacitor C3 can be electrolytic capacitors, and the first inductor L1 is a common mode inductor.

[0066] In the embodiment, the voltage conversion and rectification module 240 can be connected with the AC conversion circuit 100, and the voltage conversion and rectification module 240 can be composed of two groups of transformers and two groups of rectifier bridges, each group of rectifier bridges has two output ends, and therefore, the voltage conversion and rectification module 240 has four connection ends, i.e., a first end S1, a second end S2, a third end S3 and a fourth end S4. Since the voltage conversion and rectification module 240 includes two groups of rectifier bridges, the output electrolytic module 210 can also include only two electrolytic capacitors, each of which is used to filter high-frequency noise in the output voltage of the corresponding rectifier bridge.

[0067] Specifically, the second capacitor C2 of the output electrolytic module 210 can be connected in parallel between the first end S1 and the second end S2 of the voltage conversion and rectification module 240, and the third capacitor C3 can be connected in parallel between the third end S3 and the fourth end S4 of the voltage conversion and rectification module 240. Further, one end of the primary winding of the first inductor L1 can be connected with the third node N3, the other end of the primary winding of the first inductor L1 can be connected with the fourth node N4, one end of the secondary winding of the first inductor L1 can be connected with the anti-reverse module 220, and the other end of the secondary winding of the first inductor L1 can be connected with the second node N2.

[0068] The common-mode inductor (i.e., the first inductor L1) is placed after the electrolytic capacitor, and its main function is to suppress common-mode noise, thereby improving the electromagnetic compatibility and stability of the circuit.

[0069] In the embodiment, the anti-reverse module 220 includes at least one anti-reverse diode Dx. The anti-reverse module 220 can have various topological structures, and three topological structures of the anti-reverse module 220 are introduced below through three examples, and other structures can be set according to requirements.

[0070] Figure 8 is a seventh structural schematic diagram of the charging module of the embodiment. As shown in Figure 8 In some embodiments, in the case where the anti-reverse module 220 includes one anti-reverse diode Dx, the anode of the anti-reverse diode Dx is connected with the secondary winding of the first inductor L1, and the cathode of the anti-reverse diode Dx is connected with the first node N1.

[0071] 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 with one end of the secondary winding of the first inductor L1, and the cathode of the anti-reverse diode Dx can be connected with the first node N1. In this way, the anti-reverse diode Dx can prevent the high voltage of the subsequent load from being directly connected to cause the output electrolytic capacitor to burst.

[0072] Figure 9 is an eighth structural schematic diagram of the charging module of the embodiment. As shown in Figure 9As shown, in some embodiments, in the case that the anti-reverse module 220 includes two anti-reverse diodes Dx, the two anti-reverse diodes Dx are connected in series between the secondary side of the first inductor L1 and the first node N1.

[0073] 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 one end of the secondary side coil of the first inductor L1, 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 first node N1. In this way, by connecting the two anti-reverse diodes Dx in series, the voltage resistance of the anti-reverse module 220 can be increased, and the output electrolytic capacitor can be better protected from high voltage directly entering from the load at the back end.

[0074] Figure 10 is a ninth schematic structural diagram of a charging module according to an embodiment of the present application, Figure 10 The first inductor L1 is not shown. As Figure 10 As shown, in some embodiments, in the case that the anti-reverse module 220 includes two anti-reverse diodes Dx, the anode of one anti-reverse diode Dx is connected to the first end S1 of the voltage transformation and rectification module 240, the anode of the other anti-reverse diode Dx is connected to the third end S3 of the voltage transformation and rectification module 240, and the cathodes of the two anti-reverse diodes Dx are both connected to the first node N1.

[0075] Specifically, if the anti-reverse module 220 includes only two anti-reverse diodes Dx, the structure of the anti-reverse module 220 can also be that the anode of one anti-reverse diode Dx is connected to the first end S1 of the voltage transformation and rectification module 240, the cathode of the anti-reverse diode Dx is connected to the first node N1; the anode of the other anti-reverse diode Dx is connected to the third end S3 of the voltage transformation and rectification module 240, and the cathode of the other anti-reverse diode Dx is connected to the first node N1. In this way, this connection method can also increase the voltage resistance of the anti-reverse module 220, and the output electrolytic capacitor can be better protected from high voltage directly entering from the load at the back end.

[0076] Continuing to refer to Figure 8 Taking one voltage transformation and rectification module 240 as an example, in some embodiments, the voltage transformation and rectification module 240 includes a first transformer T1, a second transformer T2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, a ninth diode D9, and a twelfth diode D10.

[0077] The anode of the third diode D3 is connected with the cathode of the fourth diode D4, the anode of the fifth diode D5 is connected with the cathode of the sixth diode D6, the cathode of the third diode D3 is connected with the cathode of the fifth diode D5 to be the first end S1 of the voltage transformation and rectification module 240, and the anode of the fourth diode D4 is connected with the anode of the sixth diode D6 to be the second end S2 of the voltage transformation and rectification module 240; the anode of the seventh diode D7 is connected with the cathode of the eighth diode D8, the anode of the ninth diode D9 is connected with the cathode of the twelfth diode D10, the cathode of the seventh diode D7 is connected with the cathode of the ninth diode D9 to be the third end S3 of the voltage transformation and rectification module 240, and the anode of the eighth diode D8 is connected with the anode of the twelfth diode D10 to be the fourth end S4 of the voltage transformation and rectification module 240.

[0078] One end of the secondary coil of the first transformer T1 is connected between the third diode D3 and the fourth diode D4, the other end of the secondary coil of the first transformer T1 is connected between the fifth diode D5 and the sixth diode D6, one end of the secondary coil of the second transformer T2 is connected between the seventh diode D7 and the eighth diode D8, and the other end of the secondary coil of the second transformer T2 is connected between the ninth diode D9 and the twelfth diode D10.

[0079] It should be noted that the third diode D3, the fourth diode D4, the fifth diode D5 and the sixth diode D6 can form a rectifier bridge as described above, and the seventh diode D7, the eighth diode D8, the ninth diode D9 and the twelfth diode D10 can also form a rectifier bridge as described above.

[0080] In some embodiments, the DC conversion circuit 200 further comprises a switching module 250, and the switching module 250 comprises a first switching unit and a second switching unit. The first switching unit is connected in parallel between the first end S1 and the third end S3 of the voltage transformation and rectification module 240, and the second switching unit is connected in parallel between the second end S2 and the fourth end S4 of the voltage transformation and rectification module 240.

[0081] In the embodiments of the present application, the switching module 250 can be arranged between the output electrolysis module 210 and the voltage transformation and rectification module 240, or arranged between the output electrolysis module 210 and the anti-reverse module 220. The structure of the switching module 250 can be a combination transformation of multiple relays. The switching module 250 will be described in detail through three examples.

[0082] Continuing to refer to Figure 8As an example, the switch module 250 can include a first switch unit, a second switch unit, and a third switch unit, wherein the first switch unit includes the first relay K1, the second switch unit includes the second relay K2, and the third switch unit includes the third relay K3 and the fourth relay K4.

[0083] wherein one end of the first relay K1 is connected to the first end S1 of the voltage conversion and rectification module 240, and the other end of the first relay K1 is connected to the third end S3 of the voltage conversion and rectification module 240. One end of the second relay K2 is connected to the second end S2 of the voltage conversion and rectification module 240, and the other end of the second relay K2 is connected to the fourth end S4 of the voltage conversion and rectification module 240. One end of the third relay K3 is connected to the second end S2 of the voltage conversion and rectification module 240, 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 third end S3 of the voltage conversion and rectification module 240, and the other end of the fourth relay K4 is connected between the second capacitor C2 and the third capacitor C3.

[0084] Continuing to refer to Figure 9 As another example, the switch module 250 can include a first switch unit, a second switch unit, and a third switch unit, wherein the first switch unit includes the first relay K1, the second switch unit includes the second relay K2, and the third switch unit can include the third relay K3.

[0085] wherein one end of the first relay K1 is connected to the first end S1 of the voltage conversion and rectification module 240, and the other end of the first relay K1 is connected to the third end S3 of the voltage conversion and rectification module 240. One end of the second relay K2 is connected to the second end S2 of the voltage conversion and rectification module 240, and the other end of the second relay K2 is connected to the fourth end S4 of the voltage conversion and rectification module 240. One end of the third relay K3 is connected to the second end S2 of the voltage conversion and rectification module 240, and the other end of the third relay K3 is connected to the third end S3 of the voltage conversion and rectification module 240. Meanwhile, the two ends of the third relay K3 are also connected between the second capacitor C2 and the third capacitor C3.

[0086] Continuing to refer to Figure 10 As yet another example, the switch module 250 can include a first switch unit, a second switch unit, and a third switch unit, wherein the first switch unit includes the first relay K1, and the second switch unit includes the second relay K2.

[0087] The one end of the first relay K1 is connected with the second end S2 of the voltage rectification module 240, and the other end of the first relay K1 is connected with the fourth end S4 of the voltage rectification module 240. The one end of the second relay K2 is connected with the second end S2 of the voltage rectification module 240, and the other end of the second relay K2 is connected with the third end S3 of the voltage rectification module 240. It should be noted that the switch module 250 in the present example can be arranged between the output electrolysis module 210 and the anti-reverse module 220, and at this time the anti-reverse module 220 can include two anti-reverse diodes Dx, and the specific connection structure can be referred to Figure 10 , which will not be repeated here.

[0088] Therefore, when the load K1-1 is closed at the moment, a large current voltage pulse enters the DC conversion circuit 200, and the newly added protection module 230 can well absorb the voltage and current spikes from the outside, and play a role of bypassing the current and voltage spikes from the outside, and such interference will not flow inside the circuit. At the same time, due to the existence of the first diode D1, the voltage spikes absorbed on the first capacitor C1 will not be released again, and finally will be consumed through the first resistor R1 and the second resistor R2 inside the protection module 230, and the first resistor R1 also plays a role of adjusting the absorption speed. The existence of the first diode D1 will not increase the risk of increasing the capacitance of the output end X of the DC conversion circuit 200. The protection module 230 of the present application embodiment can better protect the anti-reverse diode Dx compared with the original RC circuit, ensuring the safety and stability of the anti-reverse module 220, and improving the reliability of the charging module.

[0089] On the basis of the above-mentioned embodiments, the present application embodiment further provides a charging system, which can include a plurality of charging modules as described above.

[0090] It should be noted that the details of the charging system of the present embodiment not disclosed, please refer to the details disclosed in the embodiments of the charging module in the present application, which will not be repeated here.

[0091] The device embodiments described above are only schematic, wherein the units illustrated as separate components can or can not be physically separate, and the components illustrated as units can or can not be physical units, i.e., can be located in one place, or can be distributed on multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the present embodiment scheme. Those skilled in the art can understand and implement without creative labor.

[0092] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the same; although the present application has been described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A charging module, characterized by, The AC conversion circuit and at least one group of DC conversion circuits connected with the AC conversion circuit, the DC conversion circuit comprising an output electrolysis module, an anti-reverse module and a protection module; One end of the anti-reverse module is connected with the positive end of the load to form a first node, and the other end of the anti-reverse module is connected with one end of the output electrolysis module, and the other end of the output electrolysis module is connected with the negative end of the load to form a second node, and the anti-reverse module is used to prevent high voltage of the load from being back-feeding to the charging module; The protection module is connected between the first node and the second node, and the impedance of the protection module is smaller than the impedance of the anti-reverse module.

2. The charging module of claim 1, wherein, The protection module comprises a first diode, a first capacitor and a first resistor; The anode of the first diode is connected with the first node, the cathode of the first diode is connected with one end of the first capacitor, and the other end of the first capacitor is connected with the second node; The first resistor is connected in parallel across the first capacitor.

3. The charging module of claim 2, wherein, The protection module further comprises a second resistor, one end of the second resistor is connected with the first capacitor, and the other end of the second resistor is connected with the second node.

4. The charging module of claim 3, wherein, The protection module further comprises a second diode; The anode of the second diode is connected with the cathode of the first diode, and the cathode of the second diode is connected with the second node; or The anode of the second diode is connected with the cathode of the first diode, and the cathode of the second diode is connected with one end of the second resistor.

5. The charging module of claim 3, wherein, The protection module further comprises a third resistor; One end of the third resistor is connected with the cathode of the first diode, and the other end of the third resistor is connected with the second node; or One end of the third resistor is connected with the cathode of the first diode, and the other end of the third resistor is connected with one end of the second resistor.

6. The charging module of any one of claims 1-5, wherein, The DC conversion circuit further comprises a voltage transformation and rectification module, the voltage transformation and rectification module comprising a first end, a second end, a third end and a fourth end; The output electrolysis module comprises a second capacitor, a third capacitor and a first inductor; One end of the second capacitor is connected with the first end of the voltage transformation and rectification module to form a third node, the other end of the second capacitor is connected with one end of the third capacitor, and the other end of the third capacitor is connected with the fourth end of the voltage transformation and rectification module to form a fourth node; The second end and the third end of the voltage transformation and rectification module are connected between the second capacitor and the third capacitor; The primary side of the first inductor is connected between the third node and the fourth node, and the secondary side of the first inductor is connected between the anti-reverse module and the second node.

7. The charging module of claim 6, wherein, The anti-reverse module comprises at least one anti-reverse diode; In the case that the anti-reverse module comprises one anti-reverse diode, the anode of the anti-reverse diode is connected with the secondary side of the first inductor, and the cathode of the anti-reverse diode is connected with the first node; In the case where the anti-reverse module includes two anti-reverse diodes, the two anti-reverse diodes are connected in series between the secondary side of the first inductor and the first node; or, the anode of one anti-reverse diode is connected to the first end of the voltage transformation and rectification module, the anode of the other anti-reverse diode is connected to the third end of the voltage transformation and rectification module, and the cathodes of the two anti-reverse diodes are both connected to the first node.

8. The charging module of claim 6, wherein, The voltage transformation and rectification module includes a first transformer, a second transformer, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode, an eighth diode, a ninth diode, and a twelfth diode. The primary side of the first transformer and the primary side of the second transformer are both connected to the AC conversion circuit. The anode of the third diode is connected to the cathode of the fourth diode, the anode of the fifth diode is connected to the cathode of the sixth diode, the cathode of the third diode and the cathode of the fifth diode are connected to form the first end of the voltage transformation and rectification module, and the anode of the fourth diode and the anode of the sixth diode are connected to form the second end of the voltage transformation and rectification module. The anode of the seventh diode is connected to the cathode of the eighth diode, the anode of the ninth diode is connected to the cathode of the twelfth diode, the cathode of the seventh diode and the cathode of the ninth diode are connected to form the third end of the voltage transformation and rectification module, and the anode of the eighth diode and the anode of the twelfth diode are connected to form the fourth end of the voltage transformation and rectification module. One end of the secondary side coil of the first transformer is connected between the third diode and the fourth diode, the other end of the secondary side coil of the first transformer is connected between the fifth diode and the sixth diode, one end of the secondary side coil of the second transformer is connected between the seventh diode and the eighth diode, and the other end of the secondary side coil of the second transformer is connected between the ninth diode and the twelfth diode.

9. The charging module of claim 6, wherein, The DC conversion circuit further includes a switching module, and the switching module includes a first switching unit and a second switching unit. The first switching unit is connected in parallel between the first end and the third end of the voltage transformation and rectification module, and the second switching unit is connected in parallel between the second end and the fourth end of the voltage transformation and rectification module.

10. A charging system, characterized by The charging module includes at least one charging module as claimed in any one of claims 1-9.

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