Charging control circuit based on electronic fuse and charging pile equipped with circuit

Abstract

The utility model provides a charging control circuit based on an electronic fuse and a charging pile equipped with the same, comprising a relay whose input end is coupled with an AC power supply and output end is coupled with a charging plug, and the relay is used for switching on or switching off the power supply of the charging plug according to a control signal of a master control module; the input end of the AC-DC module is coupled with an alternating current power supply, and the AC-DC module is used for converting the alternating current power supply into direct current with preset voltage The power input end of the main control module is coupled with the power output end of the electronic fuse, and the main control module is used for controlling the on-off state of the relay based on the monitoring signal output by the electronic fuse; the power input end of the electronic fuse module is coupled with the output end of the AC-DC module, the power output end of the electronic fuse module is coupled with the power input end of the main control module, and the electronic fuse module outputs monitoring signals to the main control module based on a plurality of signal detection modulation circuits coupled with the power input end. The monitoring signals include at least a fault output signal and a current monitoring signal. The charging control circuit can be applied to circuit protection of a charging pile system.

Description

Technical Field

[0001] The utility model relates to the technical field of charging equipment, and in particular to a charging control circuit based on an electronic fuse and a charging pile equipped with the circuit. Background Art

[0002] Charging stations, used for charging electric vehicles and electric bicycles, have complex internal structures and functions, often requiring operation under high voltage and high current conditions. When a circuit malfunction or anomaly occurs, the resulting current increases, potentially damaging important or valuable components within the circuit, potentially burning out the circuit or even causing a fire. Therefore, fuses are essential to protect electronic devices from overcurrent and prevent serious damage caused by internal faults.

[0003] The most common traditional fuse is the discrete blow-type fuse, which primarily provides overload protection. If the fuse is properly placed in the circuit, it will melt itself when the current abnormally rises to a certain level, cutting off the current and protecting the circuit from running safely. However, its disadvantages are very obvious:

[0004] 1) It will take up to 7% additional board space and introduce unnecessary design obstacles.

[0005] 2) They only provide protection once; if they burn out, they must be replaced. Resettable fuses are also available, but high-voltage, high-current resettable fuses are bulky and relatively expensive. They also generate heat at high currents, potentially affecting circuit performance and requiring additional cooling measures.

[0006] 3) Difficulty in fault detection: After a fuse blows, it needs to be manually inspected and replaced. The status of the fuse cannot be directly observed, which may lead to delayed fault detection.

[0007] 4) Precisely match specifications: The fuse specifications must be precisely matched to the circuit requirements, otherwise the protection effect may not be achieved. For example, if the fuse specifications are too large, when the circuit has an overcurrent, the fuse may not melt, causing damage to the equipment.

[0008] 5) Unable to continuously monitor system status. Utility Model Content

[0009] In view of the above background, the purpose of the present invention is to provide a charging control circuit based on a highly integrated IC-type electronic fuse, which is applied to the circuit protection of the charging pile system. It can provide overcurrent, overvoltage, reverse polarity and high-efficiency capacitive load protection functions in one, so as to overcome the defects of the existing discrete fuse type.

[0010] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0011] The utility model provides a charging control circuit based on an electronic fuse, comprising:

[0012] a relay, having an input end coupled to an AC power source, an output end coupled to a charging plug, and a control end coupled to a main control module, for connecting or disconnecting the power supply to the charging plug according to a control signal from the main control module;

[0013] An AC-DC module, having an input coupled to an AC power source and an output coupled to a power input of an electronic fuse, for converting the AC power source into a DC power source of a preset voltage;

[0014] a main control module having a power input terminal coupled to the power output terminal of the electronic fuse, a signal input terminal coupled to at least one signal output terminal of the electronic fuse, and a first signal output terminal coupled to the control terminal of the relay, for controlling the on / off state of the relay based on a monitoring signal output by the electronic fuse;

[0015] And an electronic fuse module, whose power input end is coupled to the output end of the AC-DC module, and whose power output end is coupled to the power input end of the main control module, and outputs a monitoring signal to the main control module based on a plurality of signal detection modulation circuits coupled to the power input end, wherein the monitoring signal includes at least a fault output signal and a current monitoring signal.

[0016] In some embodiments, the second signal output terminal of the main control module is coupled to the load detection port of the electronic fuse module for outputting an electronic fuse operation control signal.

[0017] In some embodiments, the signal detection modulation circuit includes an overcurrent protection circuit, and the overcurrent protection circuit includes an overcurrent protection resistor RILM, one end of which is coupled to the overcurrent threshold port of the electronic fuse module and the other end is grounded.

[0018] In some embodiments, the signal detection modulation circuit also includes a current response time modulation circuit, which includes a modulation capacitor Ct, one end of which is coupled to the overcurrent response time port of the electronic fuse module and the other end is grounded, and is used to modulate the overcurrent response time by adjusting the size of the modulation capacitor Ct.

[0019] In some embodiments, the signal detection modulation circuit includes an undervoltage and overvoltage protection circuit, which includes voltage-dividing resistors R1 and R2 connected in series between the power input terminal of the electronic fuse module and the ground, and the voltage-dividing output terminal between R1 and R2 is coupled to the undervoltage protection port of the electronic fuse module, which is used to adjust the undervoltage and overvoltage thresholds by configuring the resistance values ​​of R1 and R2.

[0020] In some embodiments, the signal detection modulation circuit includes an automatic retry modulation circuit, which includes modulation capacitors Cn and Cd, wherein one end of the modulation capacitor Cn is coupled to the restart number port of the electronic fuse module, and the other end is grounded, for configuring the automatic retry number after the fault shutdown; one end of the modulation capacitor Cd is coupled to the restart delay port of the electronic fuse module, and the other end is grounded, for configuring the automatic retry delay time after the fault shutdown.

[0021] In some embodiments, the electronic fuse-based charging control circuit further includes a protection circuit comprising a TVS diode coupled between a power input terminal of the electronic fuse module and ground.

[0022] In some embodiments, the electronic fuse-based charging control circuit further includes a filter protection circuit, which includes a first filter capacitor Cin coupled between the power input terminal of the electronic fuse module and ground, and a second filter capacitor CL coupled between the power output terminal of the electronic fuse module and ground.

[0023] The present invention also provides a charging pile, comprising a pile body, a charging circuit and a charging plug, wherein the charging circuit is configured with the above-mentioned charging control circuit based on the electronic fuse.

[0024] The beneficial effects of the utility model are:

[0025] The utility model replaces the traditional discrete fusible fuse with an electronic fuse, and designs a charging control circuit for a highly integrated IC-type electronic fuse. Compared with discrete fusible fuses, electronic fuses have many advantages. Electronic fuses can provide resettable outputs and do not need to be replaced after a fault occurs, allowing electronic engineers to flexibly choose the installation location. Since frequent contact is not required, the length of the cable from the power supply to the load can also be effectively shortened. In addition, the electronic fuse improves the melting time-current characteristics and has less variability, which can reduce the cable diameter, reduce weight and cut the production cost of the wiring harness. At the same time, the electronic fuse provides additional functions for the power management system to improve the effectiveness of preventive maintenance and fault diagnosis, which helps to optimize the power consumption of the electronic system, thereby maximizing the working time of the charging pile system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of a circuit module of a charging control circuit based on an electronic fuse in the present invention.

[0027] Figure 2 This is a circuit diagram of an embodiment of a charging control circuit based on an electronic fuse of the present invention. DETAILED DESCRIPTION

[0028] The following describes embodiments of the present invention in more detail with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0029] The single resistor in the circuit diagram shown in the embodiment of the present invention can be replaced by multiple resistors in series or in parallel in actual circuits, and the present invention is not limited thereto. The high-voltage capacitor can also be replaced by multiple high-voltage capacitors in series or in parallel.

[0030] like Figure 1 As shown, the embodiment of the present utility model provides a charging control circuit based on an electronic fuse, comprising:

[0031] a relay, having an input end coupled to an AC power source, an output end coupled to a charging plug, and a control end coupled to a main control module, for connecting or disconnecting the power supply to the charging plug according to a control signal from the main control module;

[0032] An AC-DC module, having an input coupled to an AC power source and an output coupled to a power input of an electronic fuse, for converting the AC power source into a DC power source of a preset voltage;

[0033] a main control module having a power input terminal coupled to the power output terminal of the electronic fuse, a signal input terminal coupled to at least one signal output terminal of the electronic fuse, and a first signal output terminal coupled to the control terminal of the relay, for controlling the on / off state of the relay based on a monitoring signal output by the electronic fuse;

[0034] The electronic fuse module has a power input coupled to the output of the AC-DC module, and a power output coupled to the power input of the main control module. Based on a number of signal detection and modulation circuits coupled to the power input, the module outputs monitoring signals to the main control module. The monitoring signals include at least a fault output signal and a current monitoring signal. This allows users to conveniently and directly read fault status via an external device connected to the main control module, such as a display screen. Furthermore, the module can sample the current operating current in real time, enhancing system monitoring and diagnostic capabilities.

[0035] As a further preferred embodiment, in the above-mentioned charging control circuit, the second signal output terminal of the main control module is coupled to the load detection port of the electronic fuse module for outputting an electronic fuse operation control signal, so that the main control module can actively control the on / off working state of the electronic fuse.

[0036] See attached Figure 2 In one illustrated example, several signal detection modulation circuits coupled to the power input terminal of the electronic fuse module include multiple or all of an overcurrent protection circuit, a current response time modulation circuit, an undervoltage and overvoltage protection circuit, and an automatic retry modulation circuit, which are described one by one below.

[0037] like Figure 2 In this example, the overcurrent protection circuit includes an overcurrent protection resistor, RILM, with one end coupled to the overcurrent threshold port of the electronic fuse module and the other end grounded. The overcurrent threshold can be configured by adjusting the resistance of RILM to ensure a fast trip response (<200ns) to output short-circuit events.

[0038] like Figure 2 In this example, the overcurrent response time modulation circuit includes a modulation capacitor Ct, one end of which is coupled to the overcurrent response time port of the electronic fuse module and the other end is grounded. This circuit is used to modulate the overcurrent response time by adjusting the value of the modulation capacitor Ct. Electronic fuses must have an adjustable overcurrent response time to handle load transient events without tripping. By adjusting the value of capacitor Ct, the overcurrent response can be intelligently managed by distinguishing between transient events and actual faults, allowing the system to operate uninterrupted during line and load transients without compromising the robustness of fault protection.

[0039] like Figure 2 In this example, the undervoltage and overvoltage protection circuit includes resistors R1 and R2 connected in series between the power input and ground of the electronic fuse module. The voltage divider output between R1 and R2 is coupled to the undervoltage protection port of the electronic fuse module. The undervoltage and overvoltage thresholds are adjusted by configuring the resistance values ​​of R1 and R2. When the voltage exceeds or falls below the set threshold, the electronic fuse disconnects the output, achieving lockout.

[0040] like Figure 2 As shown, in this example, the automatic retry modulation circuit includes modulation capacitors Cn and Cd, wherein one end of the modulation capacitor Cn is coupled to the restart number port of the electronic fuse module, and the other end is grounded, for configuring the number of automatic retries after the fault is shut down; one end of the modulation capacitor Cd is coupled to the restart delay port of the electronic fuse module, and the other end is grounded, for configuring the automatic retry delay time after the fault is shut down.

[0041] like Figure 2 As shown, the charging control circuit in this embodiment is also equipped with a protection circuit, which includes a TVS diode coupled between the power input terminal of the electronic fuse module and ground. This TVS diode can provide overvoltage and overcurrent transient protection, thereby increasing the protection limit of the overall system power supply and preventing the electronic fuse from being damaged by peak current during overcurrent faults.

[0042] As a further preferred embodiment, Figure 2 As shown, the charging control circuit in this example is further configured with a filter protection circuit, which includes a first filter capacitor Cin coupled between the power input terminal of the electronic fuse module and the ground, and a second filter capacitor CL coupled between the power output terminal of the electronic fuse module and the ground.

[0043] The present invention also provides a charging pile, comprising a pile body, a charging circuit, and a charging plug. The charging circuit is configured with the aforementioned electronic fuse-based charging control circuit. The specific structure and circuit configuration of the charging pile can be set according to actual conditions and are not specifically limited here.

[0044] It should be noted that in the above embodiment, the core part of the electronic fuse module can use an integrated IC chip, such as TI's TPS25982 chip. The main control module can be set up separately or integrated into the charging pile control system, which is not limited here.

[0045] In an example shown, the main control module may be composed of an MCU, a relay drive circuit, and a user interface displayed on a display screen, so as to adapt to the electronic fuse module to realize corresponding functions.

[0046] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Within the scope of the present invention, the technical features of the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0047] In addition, to simplify the description and discussion, and in order not to make the embodiments of the present invention difficult to understand, known power / ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided figures. In addition, the device can be shown in the form of a block diagram to avoid making the embodiments of the present invention difficult to understand, and this also takes into account the following fact, that is, the details of the implementation of these block diagram devices are highly dependent on the platform on which the embodiments of the present invention are to be implemented (that is, these details should be fully within the scope of understanding of those skilled in the art). Where specific details (e.g., circuits) are set forth to describe exemplary embodiments of the present invention, it will be apparent to those skilled in the art that the embodiments of the present invention can be implemented without these specific details or with changes in these specific details. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0048] The embodiments of the present invention are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A charging control circuit based on an electronic fuse, characterized in that: include: a relay, having an input end coupled to an AC power source, an output end coupled to a charging plug, and a control end coupled to a main control module, for connecting or disconnecting the power supply to the charging plug according to a control signal from the main control module; An AC-DC module, having an input coupled to an AC power source and an output coupled to a power input of an electronic fuse, for converting the AC power source into a DC power source of a preset voltage; a main control module having a power input terminal coupled to the power output terminal of the electronic fuse, a signal input terminal coupled to at least one signal output terminal of the electronic fuse, and a first signal output terminal coupled to the control terminal of the relay, for controlling the on / off state of the relay based on a monitoring signal output by the electronic fuse; And an electronic fuse module, whose power input end is coupled to the output end of the AC-DC module, and whose power output end is coupled to the power input end of the main control module, and outputs a monitoring signal to the main control module based on a plurality of signal detection modulation circuits coupled to the power input end, wherein the monitoring signal includes at least a fault output signal and a current monitoring signal.

2. The charging control circuit based on an electronic fuse according to claim 1, characterized in that: The second signal output terminal of the main control module is coupled to the load detection port of the electronic fuse module for outputting an electronic fuse operation control signal.

3. The charging control circuit based on an electronic fuse according to claim 1, characterized in that: The signal detection modulation circuit includes an overcurrent protection circuit. The overcurrent protection circuit includes an overcurrent protection resistor RILM, one end of which is coupled to the overcurrent threshold port of the electronic fuse module and the other end of which is grounded.

4. The charging control circuit based on an electronic fuse according to claim 3, characterized in that: The signal detection modulation circuit also includes a current response time modulation circuit, which includes a modulation capacitor Ct, one end of which is coupled to the overcurrent response time port of the electronic fuse module and the other end is grounded, and is used to modulate the overcurrent response time by adjusting the size of the modulation capacitor Ct.

5. The charging control circuit based on an electronic fuse according to claim 1, wherein: The signal detection and modulation circuit includes an undervoltage and overvoltage protection circuit, which includes voltage-dividing resistors R1 and R2 connected in series between the power input terminal of the electronic fuse module and ground. The voltage-dividing output terminal between R1 and R2 is coupled to the undervoltage protection port of the electronic fuse module, and is used to adjust the undervoltage and overvoltage thresholds by configuring the resistance values ​​of R1 and R2.

6. The charging control circuit based on an electronic fuse according to claim 1, characterized in that: The signal detection modulation circuit includes an automatic retry modulation circuit, which includes modulation capacitors Cn and Cd, wherein one end of the modulation capacitor Cn is coupled to the restart number port of the electronic fuse module and the other end is grounded, and is used to configure the number of automatic retries after a fault shutdown; One end of the modulation capacitor Cd is coupled to the restart delay port of the electronic fuse module, and the other end is grounded, for configuring the automatic retry delay time after fault shutdown.

7. The charging control circuit based on an electronic fuse according to any one of claims 1 to 6, characterized in that: A protection circuit is also included, and the protection circuit includes a TVS diode coupled between the power input terminal of the electronic fuse module and the ground.

8. The charging control circuit based on an electronic fuse according to claim 7, characterized in that: The electronic fuse module further includes a filter protection circuit, which includes a first filter capacitor Cin coupled between the power input terminal of the electronic fuse module and the ground, and a second filter capacitor CL coupled between the power output terminal of the electronic fuse module and the ground.

9. A charging pile, comprising a pile body, a charging circuit and a charging plug, characterized in that: The charging circuit is configured with a charging control circuit based on an electronic fuse as described in any one of claims 1 to 8.

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