Discharge circuit, charging module and charging pile

Abstract

This application discloses a discharge circuit, a charging module, and a charging pile. The discharge circuit is installed in the charging module and includes a first voltage branch and a second voltage branch connected in parallel with the output bus of the charging module. The first voltage branch includes a first switch module and a first resistor module, and the second voltage branch includes a second switch module and a second resistor module. The resistance values ​​of the first resistor module and the second resistor module are different. The discharge circuit of this application can select different voltage branches to achieve staged discharge according to different voltages, and can achieve rapid discharge for different voltage ranges at the output of the charging module. It can also improve the safety and reliability of the discharge circuit.

Description

Technical Field

[0001] This application relates to the field of discharge circuit technology, and more particularly to a discharge circuit, a charging module, and a charging pile. Background Technology

[0002] After the charging module finishes charging, the voltage at its output terminal needs to be discharged to prevent electric shock to operators. Related technologies incorporate a discharge circuit within the charging module. How to improve the discharge efficiency of this circuit while ensuring safety is a key technical challenge currently being researched in the industry. Utility Model Content

[0003] This application provides a discharge circuit, a charging module, and a charging pile, which can improve discharge efficiency and enhance the safety and reliability of the discharge circuit during operation, thereby at least partially solving the aforementioned technical problems.

[0004] To achieve the above objectives, according to a first aspect of this application, a discharge circuit is provided, configured in conjunction with a charging module. The charging module includes an output bus, and the discharge circuit includes a first voltage branch and a second voltage branch connected in parallel with the output bus. The first voltage branch includes a first switch module and a first resistor module connected in series, and the second voltage branch includes a second switch module and a second resistor module connected in series. The resistance values ​​of the first resistor module and the second resistor module are different.

[0005] Optionally, the first resistor module includes a plurality of first resistors.

[0006] Optionally, the first resistor may include a first variable resistor.

[0007] Optionally, each of the first resistors in the first resistor module is connected in series and / or in parallel.

[0008] Optionally, the second resistor module includes a plurality of second resistors.

[0009] Optionally, the second resistor includes a second variable resistor.

[0010] Optionally, each of the second resistors in the second resistor module is connected in series and / or in parallel.

[0011] Optionally, the discharge circuit further includes a control module, which is connected to the first switch module of the first voltage branch and the second switch module of the second voltage branch respectively; wherein, the control module is configured to control the conduction state of the first switch module and the second switch module according to the output voltage at both ends of the output bus of the charging module.

[0012] Optionally, when the resistance value of the first resistor module is greater than the resistance value of the second resistor module, the control circuit is configured to: control the first switch module to turn on and control the second switch module to turn off when the output voltage across the output bus of the charging module is greater than a preset voltage value; and control the second switch module to turn on and control the first switch module to turn off when the output voltage across the output bus of the charging module is less than or equal to a preset voltage value.

[0013] According to a second aspect of this application, a charging module is also provided, comprising: an output bus; a capacitor module connected in parallel with the output bus; and a discharge circuit as provided above, the discharge circuit being connected in parallel with the capacitor module for discharging the electrical charge stored in the capacitor module.

[0014] According to a third aspect of this application, a charging pile is also provided, including a discharge circuit as provided above, or a charging module as provided above.

[0015] In summary, the above technical solution includes a discharge circuit in the charging module to discharge the voltage at the output terminal of the charging module. This discharge circuit comprises a first voltage branch and a second voltage branch connected in parallel with the output bus of the charging module. The first voltage branch includes a first switch module and a first resistor module, and the second voltage branch includes a second switch module and a second resistor module. The resistance values ​​of the first and second resistor modules are different. In the discharge circuit of this embodiment, both the first and second voltage branches can discharge through the resistor modules when the switch module is on.

[0016] The discharge circuit of this embodiment includes two voltage branches with different resistance values. Different voltage branches can be selected according to different discharge voltages to achieve staged discharge, enabling rapid discharge at different voltage stages at the charging module output. Furthermore, because the discharge circuit of this embodiment can select voltage branches with different resistance values ​​for discharge based on different discharge voltages at the charging module output, the heat generated during discharge is distributed across different voltage branches, avoiding the safety hazards caused by concentrated heat during discharge. In addition, by using different voltage branches for staged discharge, this embodiment reduces the energy borne by the resistor modules in each voltage branch, improving the safety and reliability of the discharge circuit. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0019] Figure 1 This is a schematic diagram of a discharge circuit provided in an embodiment of this application; Figure 2 This is a circuit diagram of a discharge circuit provided in an embodiment of this application; Figure 3 This is a circuit diagram of another discharge circuit provided in an embodiment of this application; Figure 4 This is a circuit diagram of another discharge circuit provided in an embodiment of this application; Figure 5 This is a schematic diagram illustrating the energy borne by a single resistor in a current-technical discharge circuit. Figure 6 This is a schematic diagram of the energy borne by a single resistor in the discharge circuit provided in the embodiments of this application.

[0020] Explanation of icon numbers: 100, First voltage branch; 200, Second voltage branch; 300, Capacitor module. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0022] The charging pile includes a charging module that converts AC power from the power grid into DC power, which is then output to the load device. To ensure the stability of the DC power output from the charging module, a filter capacitor needs to be connected in parallel between the first output bus DC1 and the second output bus DC2 at the output end of the charging module. After charging is completed, the charge stored in the filter capacitor needs to be discharged to ensure the safety of the charging module. In this embodiment, an active or passive discharge circuit can be set in the charging module to discharge the charge in the filter capacitor at the output end of the charging module. For example, a discharge branch can be formed by connecting a discharge switch and a discharge resistor in series, and then connecting the discharge branch in parallel between the first output bus DC1 and the second output bus DC2. When it is necessary to discharge the charging module, the discharge switch is turned on, causing the charge stored in the filter capacitor to flow through the discharge resistor, where it is dissipated as heat, ultimately reducing the voltage across the filter capacitor to a safe range, thus completing the discharge operation.

[0023] In implementing the embodiments of this application, it was found that after the charging module stops charging, the output voltage has a wide voltage range depending on the load requirements. For example, the output voltage may reach 1000V under some charging conditions, while it may only be 400V under other charging conditions. When discharging the voltage at the output of the charging module from a high voltage of 1000V to a safe voltage (such as 60V), on the one hand, the same discharge resistor needs to continuously withstand high power energy; on the other hand, the current flowing through the discharge resistor under high voltage is also large. The magnitude of the current is directly proportional to the amount of heat generated. Therefore, the discharge resistor generates a high amount of heat when consuming electricity in the form of thermal energy. In summary, the discharge resistor withstands a large amount of power and generates a large amount of heat during the high-voltage stage, which can easily lead to the degradation of the discharge resistor's lifespan and the risk of local overheating in the discharge circuit. Furthermore, during the discharge from a low voltage of 400V to a safe voltage (such as 60V), the discharge current is too small because the discharge resistor is still a high-resistance resistor. This prolongs the discharge time to the tail end of the safe voltage range, thus extending the ineffective energy dissipation time and reducing discharge efficiency. In other words, using a high-resistance discharge resistor for discharge in the low-voltage stage results in a long discharge time and low discharge efficiency.

[0024] In summary, the current discharge circuit of the charging module is not very flexible, which not only affects the discharge efficiency, but may also cause safety problems due to the concentrated heat of the discharge circuit, and also affects the service life of the discharge resistor.

[0025] In view of this, embodiments of this application propose a discharge circuit, a charging module, and a charging pile, which can improve discharge efficiency and enhance the safety and reliability of the discharge circuit during operation.

[0026] Please see Figure 1 , Figure 1This is a schematic diagram of a discharge circuit provided in an embodiment of this application. Figure 1 As shown in the embodiment of this application, the discharge circuit is disposed in a charging module. The charging module includes a first output bus DC1 and a second output bus DC2. The discharge circuit includes a first voltage branch 100 and a second voltage branch 200 connected in parallel between the first output bus DC1 and the second output bus DC2. The first voltage branch 100 includes a first switch module and a first resistor module connected in series, and the second voltage branch 200 includes a second switch module and a second resistor module connected in series, wherein the resistance values ​​of the first resistor module and the second resistor module are different.

[0027] The bleedering circuit bleeds the voltage at the output terminal of the charging module, which in fact bleeds the voltage across the filter capacitor within the charging module. In this embodiment, two parallel voltage branches are set up in the bleedering circuit. Since the resistance value of the resistor module is related to the voltage to be bleeded and the final bleedering time, i.e., the resistance value of the resistor module affects the bleedering effect, different voltage branches can be selected for voltage bleedering according to the required bleedering voltage, i.e., the output voltage at the charging module's output terminal. Specifically, the resistance values ​​of the first resistor module in the first voltage branch 100 and the second resistor module in the second voltage branch 200 are different.

[0028] Understandably, high-resistance resistor modules can withstand high energy power, but have high current impedance, making them suitable for high-voltage discharge; low-resistance resistor modules can withstand low energy, but have low current impedance, resulting in a large discharge current, making them suitable for rapid low-voltage discharge.

[0029] Therefore, in this embodiment of the application, when it is necessary to discharge the output voltage of the charging module output terminal, different resistance values ​​of voltage branches can be selected for discharge operation according to the range of the output voltage to be discharged. This allows for rapid discharge of output voltages in different ranges and also ensures the safety and reliability of the discharge circuit.

[0030] Taking the discharge of 1000V voltage at the output of the charging module as an example, the discharge process can be divided into a high-voltage stage from 1000V to 500V, and a low-voltage stage from 500V to 60V. In this embodiment, depending on the stage of the voltage discharge required, discharge can be performed through voltage branches with different resistance values ​​in the high-voltage and low-voltage stages, achieving rapid discharge at all voltage stages and improving discharge efficiency.

[0031] Meanwhile, because the discharge circuit in this embodiment switches between different voltage branches during the discharge process, the heat generated during discharge can be distributed across different voltage branches, thus dispersing the heat from the resistor module and avoiding safety hazards caused by concentrated heat during discharge. This embodiment also selects different voltage branches for discharge based on the output voltage of the charging module, preventing a single resistor module from continuously bearing instantaneous high power energy, extending the lifespan of the resistor module, and improving the safety and reliability of the discharge circuit.

[0032] In some embodiments, the discharge circuit further includes a control module, which is connected to a first switching module of the first voltage branch 100 and a second switching module of the second voltage branch 200, respectively. The control module is configured to control the conduction state of the first switching module and the second switching module based on the output voltages across the first output bus DC1 and the second output bus DC2.

[0033] This application embodiment also includes a control module, wherein the discharge circuit selectively conducts between the first voltage branch 100 and the second voltage branch 200 according to the control command of the control module. The control module can be the control chip of the charging module, which controls the charging of the charging module and the discharge of the discharge circuit simultaneously.

[0034] Please continue reading. Figure 1 In each voltage branch of this application embodiment, a resistor module and a switch module are connected in series. The resistor module can determine its operating state based on the conduction state of the switch module. That is, when the switch module is on, the resistor module corresponding to that branch is connected to the capacitor of the charging module, and the charge across the capacitor flows through the resistor module to be dissipated. Therefore, the control module can control the discharge of the voltage circuit by controlling the conduction state of the switch module in a voltage branch.

[0035] For example, when the charging module stops charging, the control module obtains the output voltage between the first output bus DC1 and the second output bus DC2. This output voltage is also the capacitor voltage across the filter capacitor connected in parallel at the output terminal of the charging module. Based on the voltage value of the output voltage, the control module determines the conduction state of the first switch module and the second switch module, thereby determining the voltage branch connected to the output terminal of the charging module and the resistor module that performs the discharge operation.

[0036] In this embodiment, the control module selects different voltage branches to perform the discharge operation according to different output voltages, thereby improving the discharge efficiency of the discharge circuit.

[0037] In some embodiments, when the resistance value of the first resistor module is greater than the resistance value of the second resistor module, the control module is configured to: control the first switch module to turn on and control the second switch module to turn off when the output voltage across the first output bus DC1 and the second output bus DC2 is greater than a preset voltage value; and control the second switch module to turn on and control the first switch module to turn off when the output voltage across the first output bus DC1 and the second output bus DC2 is less than or equal to a preset voltage value.

[0038] Please continue reading. Figure 1 The resistance value of the first resistor module in the first voltage branch 100 is different from the resistance value of the second resistor module in the second voltage branch 200. Taking the case where the resistance value of the first resistor module is greater than that of the second resistor module as an example, the resistor module with a larger resistance value can withstand more energy during the discharge operation and is suitable for discharging high voltages; the resistor module with a smaller resistance value can withstand less energy during the discharge operation, but it also has a smaller impedance to the discharge current and is suitable for rapid discharge of low voltages.

[0039] Under the control of the control module, either the first voltage branch 100 or the second voltage branch 200 is connected to the output terminal of the charging module. Specifically, the control module determines the voltage branch to perform the discharge operation based on the output voltage of the charging module. When the output voltage is greater than a preset voltage value, a high-voltage discharge operation is performed, using the first voltage branch 100 with higher resistance. The control module then controls the first switch module of the first voltage branch 100 to turn on and disconnect the second switch module of the second voltage branch 200. When the output voltage is less than or equal to the preset voltage value, a low-voltage discharge operation is performed, using the second voltage branch 200 with lower resistance. The control module then controls the second switch module of the second voltage branch 200 to turn on and disconnect the first switch module of the first voltage branch 100.

[0040] In some implementations, the preset voltage value can be set to 500V, that is, the range where the output voltage is greater than 500V is defined as the high-voltage stage, and the range where the output voltage is less than or equal to 500V is defined as the low-voltage stage. It is understood that the preset voltage value in this application embodiment is not limited, and different preset voltage values ​​can be set according to different application environments in practical applications.

[0041] In some embodiments, the first resistor module includes a plurality of first resistors.

[0042] In this embodiment, when discharging through the first voltage branch 100, since the first voltage branch 100 includes a plurality of first resistors, each first resistor can dissipate heat. Compared with using a single resistor for discharging, this embodiment uses multiple first resistors for discharging, which reduces the risk borne by each first resistor and improves the safety and reliability of the voltage branch.

[0043] In some embodiments, the second resistor module includes a plurality of second resistors.

[0044] Similar to the first voltage branch 100, the second voltage branch 200 in this embodiment may also include multiple second resistors to reduce the risk borne by each second resistor when discharging during the conduction of the second voltage branch 200, thereby improving the safety and reliability of the discharge circuit.

[0045] In some embodiments, each first resistor has the same resistance value, and / or each second resistor has the same resistance value. The resistance value of the resistor in the voltage branch is related to the heat generated by the resistor. When the resistance values ​​of the resistors in the voltage branch are the same, the heat generated by the resistors is also the same, which can balance the heat dissipation of the voltage branch 100 and balance the risk borne by each resistor.

[0046] Please see Figure 2 , Figure 2 This is a circuit diagram of a discharge circuit provided in an embodiment of this application. Figure 2 As shown, the first resistor module of the first voltage branch 100 includes three first resistors, and the second resistor module of the second voltage branch 200 includes three second resistors.

[0047] It's understandable that the more first resistors in the first resistor module, the lower the risk each first resistor bears. However, increasing the number of first resistors leads to an increase in the cost and size of the bleeder circuit. In practical applications, the number of first resistors can be selected based on the application scenario while also considering cost control. The method for setting the number of second resistors in the second resistor module is the same as that for the first resistor module, and will not be repeated here. In some implementations, the resistance value of each first resistor is the same, and the resistance value of each second resistor is the same, to balance heat dissipation and the risk borne by each resistor.

[0048] In some embodiments, the first resistor includes a first variable resistor.

[0049] The resistance of the first variable resistor can be manually adjusted by means of a slider or knob. In this embodiment, the discharge circuit selects different voltage branches for discharge based on different output voltages at the charging module's output terminal, thereby improving the discharge efficiency of the charging module and enhancing the safety of the discharge circuit. To better adapt to different output voltage ranges, a first variable resistor is provided in the first resistor module. When discharging through the first voltage branch 100, the resistance value of the first variable resistor can be adjusted to meet different output voltages. For example, when the output voltage is high, the resistance value of the first variable resistor is increased; when the output voltage is low, the resistance value of the first variable resistor is decreased.

[0050] In some embodiments, the second resistor includes a second variable resistor.

[0051] Similar to the first variable resistor in the first voltage branch 100, in this embodiment, when discharging through the second voltage branch 200, the resistance value of the second variable resistor can be adjusted to meet different output voltages. For example, when the output voltage is high, the resistance value of the second variable resistor is increased; when the output voltage is low, the resistance value of the second variable resistor is decreased.

[0052] It is understood that the embodiments of this application do not limit the resistance value or form of the first or second resistor. In practical applications, different resistors can be selected according to application requirements, as long as the voltage at the output terminal of the charging module can be discharged and the resistance values ​​of the first resistor module and the second resistor module are different.

[0053] In some embodiments, the first resistors in the first resistor module are connected in series and / or in parallel.

[0054] In some embodiments, the second resistors in the second resistor module are connected in series and / or in parallel.

[0055] Please continue reading. Figure 2 , Figure 2 In the first resistor module, all the first resistors are connected in series, and in the second resistor module, all the second resistors are connected in series, which increases the withstand voltage of both the first and second resistor modules. Taking the first resistor module as an example, when all the first resistors are connected in series, the withstand voltage of the first resistor module is the sum of the withstand voltages of each first resistor, which is suitable for discharging operations when the output voltage of the charging module is in a high-voltage stage.

[0056] Please see Figure 3 , Figure 3 This is a circuit diagram of another discharge circuit provided in an embodiment of this application. For example... Figure 3As shown, the first resistors in the first resistor module are connected in parallel, and the second resistors in the second resistor module are also connected in parallel, increasing the redundancy of the first and second resistor modules. Taking the first resistor module as an example again, in... Figure 3 Even if any of the first resistors fails, the first resistor module can still function normally because all the first resistors are connected in parallel. In this case, the withstand voltage of the first resistor module remains the same as the withstand voltage of the first resistor. This resistor module is suitable for discharge operations when the charging module's output voltage is low.

[0057] Please see Figure 4 , Figure 4 This is a circuit diagram of another discharge circuit provided in an embodiment of this application. For example... Figure 4 As shown, the first resistors in the first resistor module are connected in series and parallel, and the second resistors in the second resistor module are also connected in series and parallel. This increases the withstand voltage of both the first and second resistor modules while also adding redundancy. Taking the first resistor module as an example, resistors R3, R4, and R5 in the first resistor module are connected in parallel, and then connected in series with R1 and R2. At this time, the withstand voltage of the first resistor module is the sum of the withstand voltages of resistors R1, R2, and R3. Furthermore, because resistors R3, R4, and R5 are connected in parallel, the first resistor module can still operate normally even if any one of resistors R3, R4, or R5 fails.

[0058] It is understood that the embodiments of this application do not restrict the connection of each resistor in the first resistor module or the second resistor module. In actual applications, the specific connection method can be determined according to the application scenario and requirements. As long as the resistance values ​​of the first resistor module and the second resistor module are different, the different output voltages of the charging module can be discharged.

[0059] In some embodiments, the first switching module includes a first power switch or a first relay, and the second switching module includes a first power switch or a second relay.

[0060] The first voltage branch 100 determines the discharge state based on the conduction state of the first switching module, and the second voltage branch 200 determines the discharge state based on the conduction state of the second switching module. Both power switching transistors and relays can be turned on or off according to the control commands of the control module. Generally, power switching transistors are suitable for switching devices in high-voltage circuits, while relays are suitable for switching devices in low-voltage circuits.

[0061] The discharge circuit and its operation of this application embodiment will be described in detail below through a specific example.

[0062] Please continue reading. Figure 2 , Figure 2The discharge circuit includes a first voltage branch 100 and a second voltage branch 200. The first voltage branch 100 includes a first switch module and a first resistor module. The first switch module includes a power switch transistor MOS1, and the first resistor module includes first resistors R1 to R3 connected in series, each with the same resistance value. The second voltage branch 200 includes a second switch module and a second resistor module. The second switch module includes a power switch transistor MOS2, and the second resistor module includes second resistors R4 to R6 connected in series, each with the same resistance value. The total resistance value of the first resistor module is set to be greater than the total resistance value of the second resistor module.

[0063] Taking the discharge of 1000V voltage between the first output bus DC1 and the second output bus DC2 of the charging module as an example, the preset voltage value between the high voltage stage and the low voltage stage is set to 500V. That is, the high voltage stage from 1000V to 500V is discharged by the first voltage branch 100 with a large total resistance, and the low voltage stage from 500V to the safe voltage of 60V is discharged by the second voltage branch 200 with a small total resistance.

[0064] Assuming the total discharge time of the charging module is 0.2 seconds, the output voltage during the high-voltage phase needs to discharge from V1=1000V to V2=500V within 0.05 seconds, and the output voltage during the low-voltage phase needs to discharge from V2=500V to the safe voltage V within 0.15 seconds. safe =60V, calculate the resistance R of the first voltage branch 100 according to the energy formula. high The resistance R of the second voltage branch 200 low The energy formula can be expressed as: ; ; Where C represents capacitance, t high This indicates that the high-pressure phase discharge time is 0.05 seconds, t low This indicates that the discharge time during the low-pressure phase is 0.15 seconds, and the calculated R... high ≤720, when the first resistor module includes three first resistors, the resistance value of the first resistor is set to 250Ω. The calculated R... low ≤750. Considering the current constraint in the low-voltage stage and to avoid excessive current damaging the switching module, the total resistance of the second resistor module was finally determined to be 300Ω, and the resistance of the second resistor was 100Ω. At this time, according to the energy formula, the discharge time in the low-voltage stage is verified to be about 0.133 seconds, which can meet the discharge requirements of the charging module.

[0065] In this embodiment of the application, the discharge circuit first controls the first voltage branch 100 to quickly discharge the output voltage of the charging module through the high-resistance first resistor module. After the voltage is discharged to 500V, the control module switches the second voltage branch 200 to discharge the output voltage of the charging module through the low-resistance second resistor module.

[0066] This application embodiment utilizes different voltage branches for rapid discharge during the high-voltage phase and a low-resistance voltage branch to increase the discharge current during the low-voltage phase, based on the varying output voltage ranges of the charging module. This shortens the tail time of the discharge operation and improves discharge efficiency. Furthermore, by selecting different voltage branches for discharge based on different output voltages, the heat generated during discharge is distributed across different voltage branches, avoiding the safety hazards associated with concentrated heat during discharge. Additionally, please refer to... Figure 6 , Figure 6 This is a schematic diagram illustrating the energy absorbed by a single resistor in the discharge circuit provided in this application embodiment. For example... Figure 6 As shown, the discharge circuit in this embodiment discharges in stages through different voltage branches, and... Figure 5 Compared to the energy borne by a single resistor in the prior art discharge circuit shown in the diagram, the embodiments of this application can reduce the energy borne by the resistor module in each voltage branch, thereby improving the safety and reliability of the discharge circuit.

[0067] In some embodiments, please continue reading Figure 1 This application embodiment also provides a charging module, including an output terminal, a capacitor module 300 and a discharge circuit provided in the above embodiment. The output terminal bus includes a first output bus DC1 and a second output bus DC2. The capacitor module 300 is connected in parallel between the first output bus DC1 and the second output bus DC2. The discharge circuit is connected in parallel with the capacitor module 300 and is used to discharge the power stored in the capacitor module 300.

[0068] The capacitor module 300 is connected in parallel between the first output bus DC1 and the second output bus DC2 to filter and regulate the output voltage of the charging module, so as to ensure that the charging module outputs a stable output voltage. However, the capacitor voltage of the capacitor module 300 needs to change for a period of time after the charging module stops charging, which results in residual charge in the capacitor module 300 after charging is completed, posing a safety hazard.

[0069] This embodiment of the application uses a discharge circuit to discharge the stored charge in the capacitor module 300 after charging is completed, thereby discharging the output voltage at the output terminal of the charging module. In some implementations, the capacitor module 300 may include one capacitor or multiple capacitors; if the capacitor module 300 includes multiple capacitors, the capacitors are connected in series. In some implementations, the capacitors in the capacitor module 300 are electrolytic capacitors.

[0070] In some embodiments, this application also provides a charging pile, which includes a discharge circuit as provided in the above embodiments, or a charging module as provided in the above embodiments.

[0071] It should be understood that the above-mentioned charging module includes a discharge circuit, and the charging pile includes a discharge circuit or a charging module. For a detailed description of the structure, operation mode and beneficial effects of each discharge circuit module in the charging module or charging pile, please refer to the embodiment of the above-mentioned discharge circuit, which will not be elaborated here.

[0072] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0073] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0074] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0075] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A discharge circuit, disposed in a charging module, the charging module including output buses (DC1, DC2), characterized in that, The discharge circuit includes: a first voltage branch (100) and a second voltage branch (200) connected in parallel with the output bus (DC1, DC2), wherein: The first voltage branch (100) includes a first switch module and a first resistor module connected in series, and the second voltage branch (200) includes a second switch module and a second resistor module connected in series, wherein the resistance values ​​of the first resistor module and the second resistor module are different.

2. The circuit according to claim 1, characterized in that, The first resistor module includes a plurality of first resistors.

3. The circuit according to claim 2, characterized in that, The first resistor includes a first variable resistor.

4. The circuit according to claim 2, characterized in that, The first resistors in the first resistor module are connected in series and / or in parallel.

5. The circuit according to claim 1, characterized in that, The second resistor module includes several second resistors.

6. The circuit according to claim 5, characterized in that, The second resistor includes a second variable resistor.

7. The circuit according to claim 5, characterized in that, The second resistors in the second resistor module are connected in series and / or in parallel.

8. The circuit according to claim 1, characterized in that, The discharge circuit further includes a control module, which is connected to the first switch module of the first voltage branch (100) and the second switch module of the second voltage branch (200). The control module is configured to control the conduction state of the first switch module and the second switch module according to the output voltage at both ends of the output bus (DC1, DC2).

9. The circuit according to claim 8, characterized in that, When the resistance value of the first resistor module is greater than the resistance value of the second resistor module, the control module is configured to: When the output voltage across the output bus (DC1, DC2) is greater than a preset voltage value, the first switch module is turned on and the second switch module is turned off. When the output voltage across the output bus (DC1, DC2) is less than or equal to a preset voltage value, the second switch module is turned on and the first switch module is turned off.

10. A charging module, characterized in that, include: Output buses (DC1, DC2); The capacitor module (300) is connected in parallel with the output bus (DC1, DC2); The discharge circuit as described in any one of claims 1 to 9 is connected in parallel with the capacitor module (300) and is used to discharge the electrical charge stored in the capacitor module (300).

11. A charging pile, characterized in that, The charging pile includes a discharge circuit as described in any one of claims 1 to 9, or a charging module as described in claim 10.

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