Reverse connection prevention pre-charging circuit

Abstract

The invention provides an anti-reverse-connection pre-charging circuit, and relates to the technical field of power supplies, the circuit comprises a high-voltage side anti-reverse-connection pre-charging circuit, and the high-voltage side anti-reverse-connection pre-charging circuit comprises a pre-charging module, a main positive relay, an anti-reverse-connection module, a DC-DC module and a driving module. The pre-charging module is arranged on the first branch circuit, and a power semiconductor switching device is arranged in the pre-charging module and used for controlling on-off of the pre-charging module. The main positive relay is arranged on a second branch circuit connected with the first branch circuit in parallel. The anti-reverse connection module and the DC-DC module are sequentially connected in series to a third branch, and one end of the third branch is connected with an intersection point of one side of the first branch and one side of the second branch; the driving module is arranged on a fourth branch, one end of the fourth branch is connected with the DC-DC module, and the other end of the fourth branch is connected with the power semiconductor switching device. According to the circuit, a power semiconductor switching device is additionally arranged on the high-voltage side, the on and off of the pre-charging module are controlled through the DC-DC module and the driving module, and the high-voltage reverse connection prevention function of the circuit is achieved.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of power supplies, and in particular relates to an anti-reverse connection pre-charging circuit. Background Art

[0002] With the rapid development of the new energy vehicle industry, in order to ensure the stable operation of the high-voltage system, a pre-charging circuit needs to be introduced during the charging process. This circuit limits the current through the pre-charging resistor, thereby effectively controlling the charging current and preventing excessive charging current from damaging the relay, rectifier devices and charging capacitors to be charged.

[0003] The related art pre-charge circuit includes a relay and a current-limiting resistor connected in series, and uses a Zener diode to control the opening and closing of a transistor, thereby achieving the opening and closing control of the relay. Because the power consumption of the Zener diode and transistor is mainly converted into heat, this circuit has significant power consumption and efficiency losses. In addition, the selection of Zener diode parameters increases the design difficulty. This pre-charge circuit is expensive and has relatively low reliability. Summary of the Invention

[0004] The present disclosure provides an anti-reverse connection pre-charging circuit, which aims to at least to some extent solve the technical problem in related technologies of unsatisfactory power consumption and efficiency loss caused by controlling a transistor through a voltage stabilizing diode to realize relay opening and closing control.

[0005] At least one embodiment of the present disclosure provides a reverse connection prevention pre-charging circuit, including a high-voltage side reverse connection prevention pre-charging circuit, the high-voltage side reverse connection prevention pre-charging circuit including:

[0006] A pre-charge module, which is arranged in the first branch and has a built-in power semiconductor switching device, and one end of the first branch is used to connect to an external power supply and the other end is used to connect to a charging capacitor, and the power semiconductor switching device is used to control the on and off of the pre-charge module;

[0007] a main positive relay, the main positive relay being arranged in a second branch connected in parallel with the first branch;

[0008] an anti-reverse connection module and a DC-DC module, wherein the anti-reverse connection module and the DC-DC module are sequentially connected in series in a third branch different from the first branch and the second branch, and one end of the third branch is connected to an intersection of the first branch and the second branch;

[0009] A driving module is provided in a fourth branch different from the first branch, the second branch, and the third branch, and one end of the fourth branch is connected to the output end of the DC-DC module, and the other end is connected to the control end of the power semiconductor switching device.

[0010] At least one embodiment of the present disclosure provides an anti-reverse connection pre-charging circuit further comprising:

[0011] A control module is used to start monitoring whether the anti-reverse polarity pre-charging circuit is in a pre-charging state after receiving a power supply signal from the external power supply, and to obtain the voltage of the charging capacitor when the anti-reverse polarity pre-charging circuit is in the pre-charging state, and to determine the moment when the anti-reverse polarity pre-charging circuit ends pre-charging based on the voltage of the charging capacitor, and to close the main positive relay to short-circuit the pre-charging module when the anti-reverse polarity pre-charging circuit ends pre-charging.

[0012] In the anti-reverse connection pre-charging circuit provided in at least one embodiment of the present disclosure, the pre-charging module includes a MOSFET switch and a pre-charging resistor connected in series, wherein the MOSFET switch serves as the power semiconductor switching device, and the gate of the MOSFET switch serves as the control end of the pre-charging module.

[0013] In the anti-reverse connection pre-charging circuit provided in at least one embodiment of the present disclosure, the pre-charging module includes an IGBT switch and a pre-charging resistor connected in series, wherein the IGBT switch serves as the power semiconductor switching device, and the gate of the IGBT switch serves as the control end of the pre-charging module.

[0014] In the anti-reverse connection pre-charging circuit provided in at least one embodiment of the present disclosure, the anti-reverse connection module includes an anti-reverse connection diode; and

[0015] The anti-reverse polarity pre-charging circuit also integrates the charging capacitor, which is arranged on a fifth branch that is different from the first branch, the second branch, the third branch and the fourth branch. One end of the fifth branch is connected to the other side intersection of the first branch and the second branch, and the other end is connected to the negative pole of the external power supply or is grounded.

[0016] In the anti-reverse connection pre-charging circuit provided in at least one embodiment of the present disclosure, the anti-reverse connection pre-charging circuit further includes:

[0017] Positive input interface, used to connect the positive pole of the external power supply;

[0018] Negative input interface, used to connect the negative pole of the external power supply;

[0019] A positive output interface, used to connect to the positive electrode of the charging capacitor; and

[0020] The negative electrode output interface is used to connect the negative electrode of the charging capacitor.

[0021] In the anti-reverse connection pre-charging circuit provided in at least one embodiment of the present disclosure, the control module executes the following program:

[0022] After receiving the power supply signal from the external power supply, obtaining the connection status of the anti-reverse connection pre-charging circuit;

[0023] When identifying that the wiring state of the anti-reverse connection pre-charging circuit is incorrect, determining that the anti-reverse connection module is not conducting at the current moment, issuing first notification information including that the anti-reverse connection pre-charging circuit is not in a pre-charging state, and continuing to identify the wiring state of the anti-reverse connection pre-charging circuit at the next moment;

[0024] When it is identified that the connection state of the anti-reverse connection pre-charging circuit is correct, it is determined that the anti-reverse connection module is turned on at the current moment, and a second notification message including that the anti-reverse connection pre-charging circuit is in the pre-charging state is issued; and

[0025] When the anti-reverse polarity module is turned on, the voltage of the charging capacitor is monitored, and when the voltage of the charging capacitor reaches the closing voltage of the main positive relay, the main positive relay is controlled to close to short-circuit the first branch where the pre-charging module is located, and a third notification message including the end of pre-charging of the anti-reverse polarity pre-charging circuit is issued.

[0026] In the anti-reverse connection pre-charging circuit provided in at least one embodiment of the present disclosure, the DC-DC module includes:

[0027] an input signal processing submodule, configured to perform a first-level signal processing on the power supply signal of the external power supply to reduce noise of the power supply signal;

[0028] A DC-DC conversion submodule is connected to the output end of the input signal processing submodule and is used to convert the power supply signal after the first stage signal processing into a control signal that can drive the pre-charging module to start;

[0029] The output signal processing submodule is connected to the output end of the DC-DC conversion submodule and is used to perform a second-level signal processing on the converted control signal to enhance the control signal.

[0030] In the anti-reverse connection pre-charging circuit provided in at least one embodiment of the present disclosure, the driving module includes:

[0031] a driver chip, wherein an input terminal of the driver chip is connected to the first output terminal of the DC-DC module, and is configured to receive a control signal output by the DC-DC module and control the pre-charge module to be turned on or off based on the control signal;

[0032] The driving signal processing circuit is connected to the output end of the driving chip and is used for amplifying and shaping the driving signal output by the driving chip.

[0033] At least one embodiment of the present disclosure provides an anti-reverse connection pre-charging circuit further comprising:

[0034] an isolation module, the isolation module being arranged at the input end of the DC-DC module and being used to electrically isolate the power supply signal of the external voltage from the DC-DC module;

[0035] A fault diagnosis module is connected to the driving module and is used to perform fault diagnosis on the driving module and send the fault diagnosis result to the control module so that the control module can issue a corresponding early warning signal.

[0036] Compared with the related art, the anti-reverse connection pre-charging circuit provided by the embodiment of the present disclosure realizes the pre-charging function and anti-reverse connection function on the high-voltage input side of the pre-charging circuit, and has the following technical advantages: no complex circuit structure is used, the circuit integration is high, the circuit design is relatively simple, and it has the characteristics of low cost; a pre-charging module containing a power semiconductor switching device is added to the high-voltage side, and the conduction and disconnection of the pre-charging module are controlled by the DC-DC module and the driver module to realize the high-voltage anti-reverse connection function of the circuit, ensure the reliability of the high-voltage anti-reverse connection, and reduce power consumption and efficiency loss; a charging capacitor is connected to the rear end of the pre-charging module, and a main positive relay is connected in parallel to the pre-charging module. The pre-charging module is used to control the switch of the main positive relay to realize the pre-charging function of this circuit, which has the characteristics of high reliability. The anti-reverse connection pre-charging circuit realizes effective protection against reverse connection of the battery pack, avoids equipment damage and safety hazards caused by misoperation, thereby extending the service life of the battery pack and improving the overall performance of the equipment. In addition, the anti-reverse connection pre-charging circuit disclosed in the present disclosure is flexible in design and can be customized according to different application scenarios. This feature makes the circuit have broad application prospects in many fields such as electric vehicles, solar power generation systems, and uninterruptible power supplies. In summary, the application of the anti-reverse polarity pre-charging circuit provided by at least one embodiment of the present disclosure not only improves the safety and reliability of the equipment, but also makes positive contributions to the technological progress and industrial upgrading of related industries, and solves the technical problem of related technologies in which the power consumption and efficiency loss are not ideal due to the control of the relay opening and closing by controlling the transistor through a voltage-stabilizing diode.

[0037] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0039] Figure 1 A diagram showing the composition of a reverse connection prevention pre-charging circuit according to at least one embodiment of the present disclosure;

[0040] Figure 2 A diagram illustrating the composition of another anti-reverse connection pre-charging circuit provided by at least one embodiment of the present disclosure;

[0041] Figure 3 A diagram illustrating the composition of another anti-reverse connection pre-charging circuit provided in at least one embodiment of the present disclosure;

[0042] Figure 4 A diagram illustrating the composition of another anti-reverse connection pre-charging circuit provided in at least one embodiment of the present disclosure;

[0043] Figure 5 A flow chart of the control principle of the anti-reverse connection pre-charging circuit provided in at least one embodiment of the present disclosure. DETAILED DESCRIPTION

[0044] The present disclosure is further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only used to illustrate the present disclosure and do not limit the scope of the present disclosure. Similarly, the following examples are only some embodiments of the present disclosure and not all embodiments. All other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present disclosure.

[0045] The terms "first," "second," and "third" in the embodiments of the present disclosure are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features defined as "first," "second," and "third" may explicitly or implicitly include at least one of such features.

[0046] In the description of the present disclosure, “a plurality of” means at least two, such as two or three, etc., unless otherwise clearly and specifically defined.

[0047] In the present disclosure, the terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0048] The terms "including," "having," and any variations thereof in the embodiments of the present disclosure are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to the process, method, product, or apparatus.

[0049] The term "DC-DC module" in the embodiments of the present disclosure refers to a DC voltage conversion device that converts a DC voltage of a certain voltage level into a DC voltage of another voltage level.

[0050] The term "MOSFET switch" in the embodiments of the present disclosure refers to a metal-oxide-semiconductor field-effect transistor, a semiconductor switching device.

[0051] The term “IGBT switch” in the embodiments of the present disclosure refers to an insulated gate bipolar transistor.

[0052] Figure 1 The diagram of the composition of a reverse connection prevention pre-charging circuit provided by at least one embodiment of the present disclosure. The reverse connection prevention pre-charging circuit 1 includes a high-voltage side reverse connection prevention pre-charging circuit. Figure 1 As shown, the high-voltage side reverse connection prevention pre-charging circuit may include the following pre-charging module 10 , a main positive relay 20 , an anti-reverse connection module 30 , a DC-DC module 40 and a driving module 50 .

[0053] The pre-charging module 10 is arranged in the first branch, and has a built-in power semiconductor switching device. One end of the first branch is used to connect to the external power supply 00, and the other end is used to connect to the charging capacitor 70 (also called the load capacitor). The power semiconductor switching device is used to control the on and off of the pre-charging module.

[0054] The main positive relay 20 is provided in the second branch connected in parallel with the first branch.

[0055] The anti-reverse connection module 30 and the DC-DC module 40 are sequentially connected in series in a third branch different from the first branch and the second branch, and one end of the third branch is connected to one intersection of the first branch and the second branch.

[0056] The driving module 50 is arranged in a fourth branch which is different from the first branch, the second branch and the third branch, and one end of the fourth branch is connected to the output end of the DC-DC module 40, and the other end is connected to the control end of the power semiconductor switching device (which is also the control end of the pre-charge module 10).

[0057] It should be noted that the high-voltage side refers to the side connected to the external power supply 00 with a high-voltage power supply signal, such as the high-voltage end in the vehicle controller. The design of the high-voltage side anti-reverse pre-charging circuit realizes the anti-reverse pre-charging function of the circuit by adding a pre-charging module 10, a DC-DC module 40 and a driving module 50 containing power semiconductor switching devices on the high-voltage side. The power semiconductor switching device is used to control the on and off of the pre-charging module 10, and the external power supply 00 (high-voltage DC power supply) is reduced to a gate voltage that can drive the power semiconductor switching device to start through the DC-DC module, and an anti-reverse module is added in front of the DC-DC module to realize the anti-reverse function of the pre-charging circuit. This solution fully takes into account the safety and reliability in practical applications.

[0058] During implementation, when the wiring is correct, the DC-DC module 40 works normally, providing the drive module 50 with a suitable low-voltage direct current, and the drive module 50 provides a gate voltage to turn on the power semiconductor switching device. As the charging percentage of the charging capacitor 70 increases, the closing voltage of the main positive relay 20 is reached, and the main positive relay 20 is closed, short-circuiting the pre-charge loop (first branch) to achieve the pre-charge function of the circuit. When the wiring is reversed, due to the unidirectional conductivity of the anti-reverse module 30, the DC-DC module 40 stops working, the power semiconductor switching device loses the gate voltage power supply, and cannot be turned on, thereby achieving the anti-reverse function of the circuit. The dual protection of the power semiconductor switching device and the anti-reverse module 30 increases the anti-reverse reliability of this circuit.

[0059] The anti-reverse connection pre-charging circuit provided by at least one embodiment of the present disclosure is applicable to any existing use scenario that requires an anti-reverse connection pre-charging circuit, and the embodiments of the present disclosure are not limited to this. For example, the anti-reverse connection pre-charging circuit can be applied to scenarios such as electric vehicles, solar power generation systems, and uninterruptible power supplies (UPS). In these scenarios, the pre-charging process of the battery pack is crucial. In electric vehicles, the anti-reverse connection pre-charging circuit can effectively prevent the battery pack from short-circuiting or damaging due to incorrect connection, while ensuring that the battery pack can be pre-charged smoothly before starting to protect the safety of the battery pack and the entire power system. In solar power generation systems, this circuit can also play an important role in preventing system failures caused by incorrect connection of photovoltaic panels. For uninterruptible power supplies, the anti-reverse connection pre-charging circuit ensures that it can quickly switch to battery power supply mode after the mains power is cut off, ensuring the continuity and stability of the power supply. The anti-reverse connection pre-charging circuit disclosed in the present disclosure is flexible in design and can be customized according to the needs of specific application scenarios to meet the specific requirements of different devices for anti-reverse connection and pre-charging functions.

[0060] Compared with the related art, the anti-reverse connection pre-charging circuit provided by at least one embodiment of the present disclosure realizes the pre-charging function and anti-reverse connection function on the high-voltage input side of the pre-charging circuit, and has the following technical advantages: no complex circuit structure is used, the circuit integration is high, the circuit design is relatively simple, and it has the characteristics of low cost; a pre-charging module 10 including a power semiconductor switching device is added on the high-voltage side, and the conduction and disconnection of the pre-charging module 10 are controlled by the DC-DC module 40 and the drive module 50 to realize the high-voltage anti-reverse connection function of the circuit, ensure the reliability of the high-voltage anti-reverse connection, and reduce power consumption and efficiency loss; a charging capacitor 70 is connected to the rear end of the pre-charging module 10, and a main positive relay 20 is connected in parallel to the pre-charging module 10. The pre-charging module 10 is used to control the switch of the main positive relay 20 to realize the pre-charging function of this circuit, which has the characteristics of high reliability. The anti-reverse connection pre-charging circuit realizes effective protection against reverse connection of the load (battery pack), avoids equipment damage and safety hazards caused by misoperation, thereby extending the service life of the battery pack and improving the overall performance of the equipment. In addition, the anti-reverse connection pre-charging circuit disclosed in the present invention is flexible in design and can be customized according to different application scenarios. This feature makes the circuit have broad application prospects in many fields such as electric vehicles, solar power generation systems, and uninterruptible power supplies. In summary, the anti-reverse connection pre-charging circuit provided by at least one embodiment of the present invention not only improves the safety and reliability of the equipment, but also makes positive contributions to the technological progress and industrial upgrading of related industries, and solves the technical problem of unsatisfactory power consumption and efficiency loss in related technologies due to the control of the transistor by the voltage stabilizing diode to realize the opening and closing control of the relay.

[0061] Among them, through the setting of the pre-charging module 10, the charging capacitor 70 can be pre-charged before formal charging, avoiding the impact of instantaneous large current on the entire charging circuit and protecting other components in the circuit.

[0062] The main positive relay 20 ensures that when the correct battery pack (load) connection direction is detected, the relay can be quickly and stably closed to start the charging process. This design not only improves charging efficiency, but also further enhances circuit safety.

[0063] The introduction of the anti-reverse connection module 30 effectively prevents circuit damage or safety accidents caused by reverse connection of the external power supply 00, thereby improving the safety performance of the entire circuit.

[0064] The series connection of the anti-reverse connection module 30 and the DC-DC module 40 not only realizes voltage conversion and stable output, but also provides a stable power supply for subsequent circuits.

[0065] The arrangement of the driver module 50 makes the control of the entire circuit more flexible and reliable. It can control the opening and closing of the pre-charge module 10 as needed, thereby achieving precise control of the entire charging process.

[0066] In summary, the high-voltage side reverse polarity protection pre-charging circuit has the advantages of simple structure, safety, reliability, flexible control, etc., and is suitable for various occasions requiring high-voltage side reverse polarity protection pre-charging.

[0067] Figure 2 A diagram showing another anti-reverse connection pre-charging circuit according to at least one embodiment of the present disclosure. Figure 2 As shown, in Figure 1 On the basis of the anti-reverse polarity pre-charging circuit, the anti-reverse polarity pre-charging circuit further includes a control module 60. The control module 60 is configured to, after receiving a power supply signal from an external power source 00, start monitoring whether the anti-reverse polarity pre-charging circuit is in a pre-charging state, and obtain the voltage of the charging capacitor 70 when the anti-reverse polarity pre-charging circuit is in the pre-charging state, and determine the time when the anti-reverse polarity pre-charging circuit ends pre-charging based on the voltage of the charging capacitor 70.

[0068] Through intelligent adjustments by the control module 60, when the control module 60 detects that the voltage of the charging capacitor 70 has reached a preset threshold, the anti-reverse polarity pre-charging circuit is considered complete. For new energy vehicles, the control module 60 can then send a signal to the engine control unit, instructing it to adjust the gas supply based on the current gas quality. This process not only ensures the safe and reliable operation of the anti-reverse polarity pre-charging circuit, but also further improves engine performance.

[0069] In some embodiments, the anti-reverse connection pre-charge circuit also integrates a charging capacitor 70, which is arranged on a fifth branch different from the first branch, the second branch, the third branch and the fourth branch. One end of the fifth branch is connected to the other side intersection of the first branch and the second branch, and the other end is connected to the negative pole of the external power supply 00 or grounded. The load is arranged on a sixth branch different from the first branch, the second branch, the third branch, the fourth branch and the fifth branch, and the sixth branch is connected in parallel with the fifth branch. Wherein, the introduction of the charging capacitor 70 is intended to store electrical energy and release it when needed to steadily power the load. In the anti-reverse connection pre-charge circuit, the charging capacitor 70 not only plays a role in smoothing DC voltage fluctuations, but also can provide temporary electrical energy support when the power supply is first connected or the voltage drops instantly, ensuring that the normal operation of the load is not affected. The special design of the fifth branch enables the charging capacitor 70 to work independently of other branches, avoids cross interference of the current path, and improves the stability and reliability of the circuit. At the same time, the parallel connection of the sixth branch and the fifth branch ensures that the load receives a continuous and stable power supply during and after the charging capacitor 70 is charged. This design not only optimizes the management and distribution of power, but also further enhances the overall performance and safety of the reverse polarity protection pre-charging circuit.

[0070] Figure 3A diagram showing another anti-reverse connection pre-charging circuit according to at least one embodiment of the present disclosure. Figure 3 As shown, the pre-charge module 10 includes a MOSFET switch 101 and a pre-charge resistor 102 connected in series. The MOSFET switch 101 serves as a power semiconductor switching device, and its gate serves as the control terminal. The addition of the MOSFET switch 101, a DC-DC module, and a driver module 50 for the MOSFET switch 101 on the high-voltage side implements the circuit's reverse polarity protection. A pre-charge resistor 102 and a charging capacitor 70 are added to the rear end of the MOSFET switch 101, and a main positive relay 20 is connected in parallel with the MOSFET switch 101 and the pre-charge resistor 102 to implement the circuit's pre-charge function. Compared to related art, replacing the relay with the MOSFET switch 101 can improve switch response speed and reduce the volume and weight of the pre-charge circuit components. When an external power source 00 is connected, a control signal passes through the gate of the MOSFET switch 101 in the pre-charge module 10, driving the MOSFET switch 101 to conduct. At this point, the external power source 00 pre-charges the charging capacitor 70 via the pre-charge resistor 102. The pre-charge resistor 102 serves to limit the charging current and protect circuit components. Once the voltage of the charging capacitor 70 gradually rises and reaches the preset safety threshold (the closing voltage of the main positive relay 20), the control module 60 detects this state and triggers the subsequent control process. This design not only effectively prevents circuit damage caused by reverse power connection, but also ensures stable circuit startup through the pre-charging process, improving the reliability and safety of the entire system.

[0071] In some embodiments, the pre-charge module 10 includes an IGBT switch 103 and a pre-charge resistor 102 connected in series, wherein the gate of the IGBT switch 103 serves as the control terminal of the pre-charge module 10. Wherein, the MOSFET switch 101 at the high-voltage input terminal is replaced by the IGBT switch 103, and the anti-reverse pre-charge function can still be achieved. When the IGBT switch 103 is used to replace the MOSFET switch 101, the IGBT switch 103 also serves as a power semiconductor switching device. When the external power supply 00 is connected, the control signal passes through the gate of the IGBT switch 103 to drive the IGBT switch 103 to turn on. At this time, the external power supply 00 pre-charges the charging capacitor 70 through the pre-charge resistor 102. The pre-charge resistor 102 still plays the role of limiting the charging current and protecting the circuit elements. As the voltage of the charging capacitor 70 gradually rises, when it reaches the preset safety threshold (i.e., the closing voltage of the main positive relay 20), the control module 60 can also detect this state and trigger the subsequent control process. Although this replacement solution uses different power semiconductor switching devices, it still maintains the core functions and advantages of the anti-reverse polarity pre-charging circuit, ensuring stable startup of the circuit and improving the reliability and safety of the overall system.

[0072] In some embodiments, in order to simplify the circuit layout, the anti-reverse connection module 30 includes an anti-reverse diode 301. As a key circuit component, the anti-reverse connection diode 301 has the main function of preventing the reverse flow of current. When the external power supply 00 is connected with the correct polarity, the anti-reverse connection diode 301 is in a forward conduction state, allowing current to pass smoothly, thereby pre-charging the charging capacitor 70. However, if the external power supply 00 is connected with reverse polarity, the anti-reverse connection diode 301 will be quickly cut off, effectively blocking the reverse current, thereby avoiding the circuit short circuit and component damage that may be caused by the reverse connection of the power supply. This design not only enhances the fault tolerance of the circuit, but also greatly improves the safety of the overall system. In addition, the introduction of the anti-reverse connection diode 301 does not increase the complexity of the circuit. On the contrary, due to its simple and reliable working principle, it makes the entire anti-reverse connection pre-charging circuit more efficient and stable.

[0073] Figure 4 A diagram showing another anti-reverse connection pre-charging circuit according to at least one embodiment of the present disclosure. Figure 4As shown, the anti-reverse connection pre-charging circuit also includes a positive input interface DC1+, a negative input interface DC1-, a positive output interface DC2+ and a negative output interface DC2-. The positive input interface DC1+ (also known as the high-voltage DC positive input) is used to connect the positive pole of the external power supply 00. The negative input interface DC1- (high-voltage DC negative input) is used to connect the negative pole of the external power supply 00. The positive output interface DC2+ is used to connect the positive pole of the charging capacitor 70. The negative output interface DC2- is used to connect the negative pole of the charging capacitor 70. Among them, the positive input interface DC1+ and the negative input interface DC1- constitute the main channels for accessing the external power supply 00, ensuring the correct access of the power supply. The positive output interface DC2+ and the negative output interface DC2- serve as the connection bridge of the charging capacitor 70, stably transmitting the electrical energy of the external power supply 00 to the charging capacitor 70 for pre-charging operation. Such a design not only clarifies the function of each interface, but also improves the usability and reliability of the circuit through a clear interface layout. In actual applications, the user only needs to correctly connect the external power supply 00 and the charging capacitor 70 according to the interface identification to easily realize the anti-reverse connection pre-charging function.

[0074] In some embodiments, in order to effectively manage the anti-reverse connection pre-charging circuit, the control module is configured to execute the following steps S01 to S04.

[0075] Step S01: After receiving a power supply signal from an external power source 00, a connection state of the anti-reverse connection pre-charging circuit is obtained.

[0076] Step S02: When it is identified that the connection state of the anti-reverse connection pre-charging circuit is incorrect, it is determined that the anti-reverse connection module 30 is not conducting at the current moment, and a first notification message including that the anti-reverse connection pre-charging circuit is not in the pre-charging state is issued, and the connection state of the anti-reverse connection pre-charging circuit is continued to be identified at the next moment.

[0077] Step S03: When it is identified that the connection state of the anti-reverse connection pre-charging circuit is correct, it is determined that the anti-reverse connection module 30 is turned on at the current moment, and a second notification message including that the anti-reverse connection pre-charging circuit is in the pre-charging state is issued.

[0078] Step S04: When the anti-reverse polarity module 30 is turned on, the voltage of the charging capacitor 70 is monitored, and when the voltage of the charging capacitor 70 reaches the closing voltage of the main positive relay 20, the main positive relay is controlled to close to short-circuit the first branch where the pre-charging module is located, and a third notification message including the end of pre-charging of the anti-reverse polarity pre-charging circuit is issued.

[0079] Among them, effective management of the anti-reverse connection pre-charging circuit is achieved through steps S01-S04. At the initial stage of power supply access, the wiring status can be quickly judged through the identification of steps S01 and S012 to prevent circuit damage or safety hazards caused by wiring errors. Once the wiring is correct, step S03 immediately issues a pre-charge status notification to prepare for subsequent operations. At the same time, the monitoring and control mechanism of step S04 ensures the safe rise of the voltage of the charging capacitor 70, and automatically completes the switching of the circuit when the closing condition of the main positive relay 20 is reached, and issues a pre-charge end notification. The design of this series of steps not only improves the safety and reliability of the circuit, but also greatly simplifies the operating process and enhances the user experience.

[0080] Figure 5 The flow chart of the control principle of the anti-reverse connection pre-charge circuit provided by at least one embodiment of the present disclosure is as follows. Figure 5 As shown, after receiving the power supply signal, first check the wiring through step S01. If the wiring is incorrect, only step S02 is executed. At this time, the DC-DC module 40 and the drive module 50 do not work due to no power supply, the semiconductor switch device does not conduct without gate drive voltage, and the entire circuit is open to form reverse connection protection. If the wiring is correct, steps S03-S04 are executed. The DC-DC module 40 works normally and provides a suitable low-voltage signal to the drive module 50. The drive module 50 provides a gate voltage to turn on the power semiconductor switch device, and the charging capacitor 70 is charged. When the voltage of the charging capacitor 70 reaches the closing voltage of the main positive relay 20, the main positive relay 20 is closed, and the pre-charging is completed.

[0081] In some embodiments, to improve the accuracy and stability of the control signal, the DC-DC module 40 includes an input signal processing submodule 401, a DC-DC conversion submodule 402, and an output signal processing submodule 403, which are connected in sequence. The input signal processing submodule 401 is used to perform a first-level signal processing on the power supply signal of the external power supply 00 to reduce the noise of the power supply signal. The DC-DC conversion submodule 402 is connected to the output end of the input signal processing submodule 401 and is used to convert the power supply signal that has undergone the first-level signal processing into a control signal that can drive the pre-charge module 10 to start. The output signal processing submodule 403 is connected to the output end of the DC-DC conversion submodule 402 and is used to perform a second-level signal processing on the converted control signal to enhance the control signal. The output signal processing submodule 403 stably outputs the enhanced control signal to the driver module 50, ensuring that the driver module 50 can receive an accurate and stable control signal, thereby precisely controlling the conduction and shutdown of the power semiconductor switching device. For example, the first-level signal processing includes filtering, and the second-level signal processing includes filtering and rectification. This multi-level signal processing design not only improves the accuracy and stability of the control signal, but also effectively reduces the impact of external power supply 00 noise on the circuit, further enhancing the reliability and safety of the anti-reverse pre-charging circuit.

[0082] In some embodiments, in order to improve the accuracy and stability of the control signal, the driving module 50 includes a driving chip 501 and a driving signal processing circuit 502 connected in sequence. The driving chip 501, the input end of the driving chip 501 is connected to the first output end of the DC-DC module 40, for receiving the control signal output by the DC-DC module 40, and controlling the pre-charging module 10 to be turned on or off based on the control signal. The driving signal processing circuit 502 is connected to the output end of the driving chip 501, and is used to amplify and shape the driving signal output by the driving chip 501. Among them, the amplification process can increase the amplitude of the driving signal and ensure that the driving signal has sufficient energy to drive the power semiconductor switching device. The shaping process can optimize the waveform of the driving signal and reduce waveform distortion, thereby improving the stability and reliability of the circuit. Through the processing of the driving signal processing circuit 502, the driving module 50 can output a high-quality driving signal, ensuring that the pre-charging module 10 can accurately and quickly respond to the control signal, and realize efficient and stable operation of the anti-reverse pre-charging circuit.

[0083] In some embodiments, the anti-reverse polarity pre-charging circuit further includes an isolation module 80 and a fault diagnosis module 90. The isolation module 80 is provided at the input end of the DC-DC module 40 and is used to electrically isolate the external voltage supply signal from the DC-DC module 40. The fault diagnosis module 90 is connected to the drive module 50 and is used to perform fault diagnosis on the drive module 50 and send the fault diagnosis results to the control module 60 so that the control module 60 can issue a corresponding warning signal.

[0084] Although the embodiments of the present disclosure have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present disclosure, and such modifications and variations are all within the scope defined by the appended claims.

[0085] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A reverse connection prevention pre-charging circuit, comprising a high-voltage side reverse connection prevention pre-charging circuit, characterized in that, The high-voltage side anti-reverse connection pre-charging circuit comprises: A pre-charge module, which is arranged in the first branch and has a built-in power semiconductor switching device, and one end of the first branch is used to connect to an external power supply and the other end is used to connect to a charging capacitor, and the power semiconductor switching device is used to control the on and off of the pre-charge module; a main positive relay, the main positive relay being arranged in a second branch connected in parallel with the first branch; an anti-reverse connection module and a DC-DC module, wherein the anti-reverse connection module and the DC-DC module are sequentially connected in series in a third branch different from the first branch and the second branch, and one end of the third branch is connected to a side intersection of the first branch and the second branch; and A driving module is provided in a fourth branch different from the first branch, the second branch, and the third branch, and one end of the fourth branch is connected to the output end of the DC-DC module, and the other end is connected to the control end of the power semiconductor switching device.

2. anti-reverse connection precharge circuit according to claim 1, is characterized in that, Also includes: A control module is used to start monitoring whether the anti-reverse polarity pre-charging circuit is in a pre-charging state after receiving a power supply signal from the external power supply, and to obtain the voltage of the charging capacitor when the anti-reverse polarity pre-charging circuit is in the pre-charging state, and to determine the moment when the anti-reverse polarity pre-charging circuit ends pre-charging based on the voltage of the charging capacitor, and to close the main positive relay at the moment when the anti-reverse polarity pre-charging circuit ends pre-charging to short-circuit the pre-charging module.

3. anti-reverse connection precharge circuit according to claim 1, is characterized in that, The pre-charge module includes a MOSFET switch and a pre-charge resistor connected in series, wherein the MOSFET switch serves as the power semiconductor switching device, and the gate of the MOSFET switch serves as the control terminal of the pre-charge module.

4. anti-reverse connection precharge circuit according to claim 1, is characterized in that, The pre-charge module includes an IGBT switch and a pre-charge resistor connected in series, wherein the IGBT switch serves as the power semiconductor switching device, and the gate of the IGBT switch serves as the control terminal of the pre-charge module.

5. anti-reverse connection precharge circuit according to claim 1, is characterized in that, The anti-reverse connection module includes an anti-reverse connection diode; and The anti-reverse polarity pre-charging circuit also integrates the charging capacitor, which is arranged on a fifth branch that is different from the first branch, the second branch, the third branch and the fourth branch. One end of the fifth branch is connected to the other side intersection of the first branch and the second branch, and the other end is connected to the negative pole of the external power supply or is grounded.

6. according to the anti-reverse connection pre-charge circuit described in any one of claim 1-5, it is characterized in that, The anti-reverse connection pre-charging circuit also includes: Positive input interface, used to connect the positive pole of the external power supply; Negative input interface, used to connect the negative pole of the external power supply; A positive output interface, used to connect to the positive electrode of the charging capacitor; and The negative electrode output interface is used to connect the negative electrode of the charging capacitor.

7. anti-reverse connection precharge circuit according to claim 2, is characterized in that, The control module executes the following procedures: After receiving the power supply signal from the external power supply, obtaining the connection status of the anti-reverse connection pre-charging circuit; When identifying that the wiring state of the anti-reverse connection pre-charging circuit is incorrect, determining that the anti-reverse connection module is not conducting at the current moment, issuing first notification information including that the anti-reverse connection pre-charging circuit is not in a pre-charging state, and continuing to identify the wiring state of the anti-reverse connection pre-charging circuit at the next moment; When it is identified that the connection state of the anti-reverse connection pre-charging circuit is correct, it is determined that the anti-reverse connection module is turned on at the current moment, and a second notification information including that the anti-reverse connection pre-charging circuit is in the pre-charging state is issued; as well as, When the anti-reverse polarity module is turned on, the voltage of the charging capacitor is monitored, and when the voltage of the charging capacitor reaches the closing voltage of the main positive relay, the main positive relay is controlled to close to short-circuit the first branch where the pre-charging module is located, and a third notification message including the end of pre-charging of the anti-reverse polarity pre-charging circuit is issued.

8. according to the anti-reverse connection pre-charge circuit described in any one of claim 1-5, it is characterized in that, The DC-DC module includes: an input signal processing submodule, configured to perform a first-level signal processing on the power supply signal of the external power supply to reduce noise of the power supply signal; A DC-DC conversion submodule is connected to the output end of the input signal processing submodule and is used to convert the power supply signal after the first stage signal processing into a control signal that can drive the pre-charge module to start; and The output signal processing submodule is connected to the output end of the DC-DC conversion submodule and is used to perform a second-level signal processing on the converted control signal to enhance the control signal.

9. according to the anti-reverse connection pre-charge circuit described in any one of claim 1-5, it is characterized in that, The driving module includes: a driver chip, wherein the input terminal of the driver chip is connected to the first output terminal of the DC-DC module, and is configured to receive a control signal output by the DC-DC module and control the pre-charge module to be turned on or off based on the control signal; and The driving signal processing circuit is connected to the output end of the driving chip and is used for amplifying and shaping the driving signal output by the driving chip.

10. The anti-reverse connection precharge circuit according to claim 2, wherein Also includes: an isolation module, the isolation module being arranged at the input end of the DC-DC module and being used to electrically isolate the power supply signal of the external voltage from the DC-DC module; A fault diagnosis module is connected to the driving module and is used to perform fault diagnosis on the driving module and send the fault diagnosis result to the control module so that the control module can issue a corresponding early warning signal.

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