Multifunctional protection module for automobile charging pile

Abstract

The invention belongs to the technical field of new energy, and particularly relates to a multifunctional protection module for an automobile charging pile. The module aims to solve the defects of poor safety, high cost, long research and development period and the like of an alternating current charging pile in the prior art, and cost reduction and benefit improvement are realized through integrated design. The module comprises a circuit breaker unit, an electric leakage detection unit, an electric energy metering unit, a system temperature detection unit, a controller unit and a data communication port, and the units are connected through internal circuits to realize real-time data acquisition and processing. The module has multiple protection functions of electric leakage opening protection control, short circuit opening protection, overload opening protection, fault opening protection, over-temperature opening protection, overvoltage and undervoltage opening protection and the like, and charging safety is ensured. According to the implementation of the invention, the safety and reliability of the charging pile are improved, the production and maintenance cost is reduced, the research and development period is shortened, and the user experience is improved.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and more specifically, to a multifunctional protection module for a car charging pile. Background Art

[0002] With the increase in the number of new energy vehicles, the demand for electric vehicle charging piles has also grown rapidly. AC charging piles have become the mainstream charging method on the market due to their small footprint and flexible layout. Currently, AC charging piles are generally designed with an external circuit breaker (RCD) + internal relay. As an independent leakage protection device, the external circuit breaker (RCD) cannot be linked to the charging pile, and the type of RCD (Type A / Type AC / Type B / Type F / Type A+DC6mA) needs to be replaced according to the requirements of different customers or standards; the internal relay used as the charging on-off control has the risk of high current adhesion.

[0003] How to ensure charging safety while reducing costs and shortening the R&D cycle under fierce market competition has become the focus of current charging pile manufacturers and potential users. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a highly integrated and miniaturized solution for the design of AC charging piles for electric vehicles, which can be used in AC charging piles to achieve cost reduction and efficiency improvement for AC charging pile manufacturers.

[0005] To achieve the above object, the present invention provides the following technical solutions: A multifunctional protection module for a car charging pile, comprising: a circuit breaker unit, a leakage detection unit, an electric energy metering unit, a system temperature detection unit, a controller unit and a data communication port; The circuit breaker unit is used to detect leakage and act as an actuator for charging on and off; The leakage detection unit is used to perform leakage detection on the charging line input neutral and live wires; The electric energy metering unit is used to sample the voltage and current of the charging line input neutral and live wires and to calculate and process the sampled voltage and current values ​​to obtain electric energy and power values; The system temperature detection unit is used to detect the system temperature; The controller unit is used to perform calculations and logical judgments on the various data detected, and drive the circuit breaker to disconnect or close the charging pile output; The data communication port is used to exchange data with the charging pile controller, to feed back the device status to the charging pile controller in real time, and to receive control signals and configuration data from the charging pile controller.

[0006] Furthermore, the circuit breaker unit is connected to the leakage detection unit, the electric energy metering unit, the system temperature detection unit and the controller unit through an internal circuit to realize real-time data collection and processing.

[0007] Furthermore, the controller unit is connected to the data communication port through an internal circuit to achieve data interaction with the charging pile controller.

[0008] Furthermore, the system temperature detection unit is connected to the controller unit via NTC to achieve real-time monitoring of the system operating temperature.

[0009] Furthermore, the controller unit has the following protection functions: leakage tripping protection control, short circuit tripping protection function, overload tripping protection function, fault tripping protection function, over-temperature tripping protection function and over- and under-voltage tripping protection function.

[0010] Furthermore, the electric energy metering unit can collect the current and voltage values ​​of the charging circuit in real time through the manganese copper shunt and the high-precision resistor, obtain the electric energy and power values ​​through data calculation and processing, and output the electric energy data through the data communication port.

[0011] Furthermore, the opening and closing control unit adopts an integrated design, which distinguishes between opening and closing operations by controlling the duration of the signal and the control sequence.

[0012] Furthermore, the tripping operation includes protection tripping and remote command tripping, wherein if the protection tripping operation is unsuccessful, it will be repeated until it succeeds or the maximum number of repetitions is reached.

[0013] Furthermore, the closing operation is performed only when a remote closing command is received and the circuit breaker is in an open state and no protection type opening occurs.

[0014] Furthermore, in an automobile charging pile using a multifunctional protection module, a charging pile controller is connected to the multifunctional protection module via a data communication port to achieve remote control and status monitoring of the multifunctional protection module.

[0015] By adopting the above technical solution, the beneficial effects of the present invention are: Integrated design: The present invention integrates the circuit breaker (RCD), voltage and current sampling, leakage detection, energy metering and system temperature detection into one module, thus achieving a highly integrated and miniaturized design, reducing the need for external components and simplifying the structure of the charging pile.

[0016] Reduce costs: The integrated design eliminates external circuit breakers and relays, reduces material costs and installation costs, and helps reduce overall production costs.

[0017] Improved safety: The multifunctional protection module integrates a variety of safety protection mechanisms, including leakage protection, short circuit protection, overload protection, fault protection, over-temperature protection, and over- and under-voltage protection, which improves the safety and reliability of the charging pile.

[0018] Enhanced compatibility: The module integrates multiple leakage protection standards and can switch protection standards through the data communication port to meet the requirements of different customers and standards, thereby improving the compatibility of the equipment.

[0019] Improve system performance: Use circuit breakers (RCD) instead of relays as the on-off control of charging, increase the electrical gap, and improve the system's breaking capacity and safety performance.

[0020] Simplified control logic: The charging pile main controller only needs to perform simple communication interaction functions, which simplifies the control logic and makes the charging pile more reliable.

[0021] Real-time data interaction: The multifunctional protection module exchanges data with the charging pile controller through the data communication port, realizing real-time feedback and remote control of the equipment status, thus improving the response speed and intelligence level of the system.

[0022] Reduce development cycle: Integrate multiple safety protection mechanisms and power metering functions to reduce the workload of secondary development and shorten the customer development cycle.

[0023] Improve system reliability: The equipment status indication and circuit breaker status monitoring functions of the multifunctional protection module can simply and clearly indicate the on and off status of the circuit breaker, and monitor the on and off status of the circuit breaker in real time, thereby improving the reliability of the system.

[0024] Reduce maintenance difficulty: Due to the integration of multiple protection functions, the use of external components is reduced, which reduces the maintenance difficulty and cost of the charging pile.

[0025] Improve user experience: Through remote opening and closing control, users can remotely control the charging pile, which improves the convenience of use and user experience.

[0026] Improve the safety of the whole machine: The design of the integrated control unit for opening and closing avoids the problem of the electromagnetic coil heating up due to long power-on time and affecting its life. It also avoids the accidental closing operation when the switch status monitoring device fails, thus improving the safety of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Provides a system design block diagram for the AC charging piles currently on the market.

[0028] Figure 2 A block diagram of a system design for an AC charging pile using the present invention.

[0029] Figure 3 This is an internal functional block diagram of the present invention.

[0030] Figure 4 This is a block diagram to introduce the multifunctional protection of the present invention.

[0031] Figure 5 This is a functional block diagram of the electric energy metering unit in the present invention.

[0032] Figure 6 This is a functional block diagram of the integrated control unit for opening and closing of a circuit breaker in the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] like Figure 1 As shown, the front end of the traditional charging pile needs to be used with an independent circuit breaker, which has some problems: the charging pile and the circuit breaker cannot be controlled in a coordinated manner, the internal functions of the charging pile are dispersed, the main controller of the charging pile needs to process multiple acquisition signals, and the development and certification cycle is long.

[0036] like Figure 2 As shown, the present invention integrates the circuit breaker (RCD), voltage, current and leakage detection into the multifunctional protection module, eliminating the relay, thus having the following advantages: Advantage 1: It saves relays and reduces the material cost of AC charging piles; Advantage 2: No need to install an external circuit breaker (RCD) independently, which reduces the installation cost of AC charging piles; Advantage 3: It solves the potential safety hazard of relay contacts sticking when the current is high; Advantage 4: Using a circuit breaker (RCD) instead of a relay as the on-off control of charging increases the electrical gap and improves the system's breaking capacity and safety performance; Advantage 5: The system integration is improved. The main controller of the charging pile only needs to perform simple communication interaction functions, making the charging pile more reliable.

[0037] like Figure 3 As shown, it is the internal functional block diagram of the present invention. The multifunctional protection module performs leakage detection on the charging line input neutral and live wires, voltage and current sampling and electric energy calculation, system temperature detection, and calculation and logical judgment on the various data detected; the internal integrated circuit breaker serves as the charging on-off actuator. When the controller of the multifunctional protection module determines that protection is required, it drives the circuit breaker to disconnect the charging pile output. The multifunctional protection module exchanges data with the charging pile controller through the data communication port, feeds back the device status to the charging pile controller in real time, and receives the control signal and configuration data of the charging pile controller.

[0038] The device status indication function of the multifunctional protection module simply and clearly indicates the on / off status of the circuit breaker. The circuit breaker status monitoring function of the multifunctional protection module monitors the on / off status of the circuit breaker in real time and feeds back to the charging pile controller, improving system reliability: The invention integrates the circuit breaker (RCD), voltage, current and leakage detection into a multifunctional protection module, eliminating the relays in the traditional design. This integrated design allows real-time monitoring and control of the circuit breaker status.

[0039] The multifunctional protection module performs leakage detection, voltage and current sampling, energy calculation, system temperature detection, and calculation and logical judgment on the various data detected. These data include but are not limited to current, voltage, leakage and system temperature, which are key parameters for judging the status of the circuit breaker.

[0040] The internally integrated circuit breaker is used as the actuator for charging on and off. When the controller of the multi-function protection module determines that protection is needed, it will drive the circuit breaker to disconnect the charging pile output. This control is based on real-time monitoring data and preset safety thresholds.

[0041] The multifunctional protection module exchanges data with the charging pile controller through the data communication port, feeds back the device status to the charging pile controller in real time, and receives the control signal and configuration data of the charging pile controller. This ensures real-time monitoring and remote control of the circuit breaker status.

[0042] The multifunctional protection module has the function of indicating the device status, which can simply and clearly indicate the on and off status of the circuit breaker. This is achieved through the logic judgment and status indication circuit inside the module.

[0043] The circuit breaker status monitoring function of the multi-function protection module monitors the on-off status of the circuit breaker in real time and feeds back to the charging pile controller, improving system reliability. This is achieved by monitoring the physical status of the circuit breaker (such as the opening and closing status of the contacts) and converting it into an electrical signal, which is then sent to the controller through the data communication port.

[0044] The module adopts an integrated design for the opening and closing control of the circuit breaker, which simplifies the control process, reduces costs, and improves control reliability.

[0045] Through the above method, this invention patent realizes real-time detection and control of the circuit breaker status, ensuring the safety and reliability of the car charging pile.

[0046] like Figure 4 As shown, the present invention integrates multiple safety protection mechanisms and electric energy metering functions, reduces the workload of secondary development, and shortens the customer development cycle: Leakage trip protection control: In the leakage protection function, the high-precision leakage detection circuit detects system leakage through the fluxgate principle. The present invention integrates multiple leakage protection standards such as Type A / Type AC / Type B / Type F / Type A+DC6mA. Customers can switch protection standards through the data communication port to meet the requirements of different customers and standards, thereby improving the compatibility of the equipment. The main controller compares the detected leakage data with the leakage protection standard threshold configured by the system. When the leakage value exceeds the set threshold, the controller drives the circuit breaker to disconnect the charging circuit; Short-circuit protection function: The internal circuit breaker has a mechanical short-circuit protection function. When the charging circuit current exceeds the set threshold, the circuit breaker will disconnect the charging circuit within 3mS.

[0047] Overload trip protection function: The module uses a manganese copper shunt to accurately detect the real-time current value of the charging circuit and compares it with the overload protection threshold set by the system. When the overload protection is triggered, the controller drives the circuit breaker to disconnect the charging circuit; Fault trip protection function: The module will continuously detect the system status every time it is powered on and running. When a system failure occurs, the controller drives the circuit breaker to disconnect the charging circuit; Over-temperature trip protection function: The module collects the system operating temperature through NTC. When the collected temperature exceeds the set threshold or the temperature rise exceeds the threshold, the controller drives the circuit breaker to disconnect the charging circuit; Over-voltage and under-voltage tripping protection function: The module uses a high-precision resistor to detect the real-time voltage value of the charging circuit and compares it with the voltage protection threshold set by the system. When the system voltage is not within the threshold range, the controller drives the circuit breaker to disconnect the charging circuit; Remote opening and closing control: The charging pile controller can perform opening and closing actions by instructing the remote control module, giving the charging pile a subjective protection function and improving its ease of use.

[0048] like Figure 5 As shown, the module has the function of electric energy metering. The main controller collects the current and voltage values ​​of the charging circuit in real time through the manganese copper shunt and high-precision resistors, obtains the electric energy and power values ​​through data calculation and processing, and outputs the electric energy data through the data communication port.

[0049] like Figure 6 As shown in the figure, the module adopts an integrated design for the opening and closing control of the circuit breaker, which is simpler and more effective than the conventional opening and closing with two sets of circuits and mechanisms, reducing the cost of the charging pile and improving the reliability of control. Every time the internal electromagnetic coil of the electric switch in the opening and closing integrated control unit is energized, the moving contact in the electromagnetic coil pushes the electric switch to operate once, and the electric switch state will cycle between opening-closing-opening-closing, where the thrust required for opening is much smaller than the thrust required for closing. Therefore, the controller strictly controls and distinguishes the duration and control sequence of the operation signals of opening and closing, so that the thrust of the opening operation sequence is not enough to push the electric switch to close. This can not only avoid the electromagnetic coil from heating up due to long power-on time and affecting its life, but also avoid the wrong closing operation when the electric switch state monitoring device fails, thereby improving the safety of the whole machine.

[0050] Opening operation: The opening operation is divided into protection opening and remote command opening. When the controller determines that a protection opening action is required or receives a remote opening command, the controller will first determine the on / off state of the current circuit breaker. If the circuit breaker is in a closed state at this time, the controller outputs a control signal to control the IGBT to turn on after optical coupling isolation. The opening control signal lasts for 2mS, the internal electromagnetic coil of the circuit breaker is energized, and the moving contact in the electromagnetic coil pushes the circuit breaker to open.

[0051] For protection-type opening operations, the controller will detect whether the opening is successful after execution. If it is unsuccessful, it will execute the opening operation again. If the opening is still unsuccessful after repeating 5 times, it will no longer be repeated. This can better ensure the safety of the charging pile.

[0052] For the remote command opening operation, each time the remote opening command is received, the controller will only execute the opening operation once. Even if the opening is unsuccessful, it will not be executed again, but wait for the next command.

[0053] Closing operation: When the controller receives a remote closing command, it will first determine the on / off state of the current circuit breaker. If the circuit breaker is in the off state and no protection type tripping occurs, the controller will wait for 10mS after the power passes through zero and then output the control signal to control the IGBT to turn on after optical coupling isolation (the delay of 10mS is to ensure that the voltage is near the peak value when closing, and the thrust of the moving contact is the largest at this time). The closing control signal lasts for 5mS, the internal electromagnetic coil of the switch is energized, and the moving contact in the electromagnetic coil pushes the switch to close. Each time a remote closing command is received, the controller only performs a closing operation. Even if the closing is unsuccessful, it will not be re-executed, but wait for the next command.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A multifunctional protection module for a car charging pile, characterized in that: include: A circuit breaker unit, used to detect leakage and act as an actuator for charging on and off; A leakage detection unit, used to perform leakage detection on the neutral and live wires of the charging line input; An electric energy metering unit is used to sample the voltage and current of the charging line input neutral and live wires and to calculate and process the sampled voltage and current values ​​to obtain electric energy and power values; A system temperature detection unit, used for detecting the system temperature; The controller unit is used to perform calculations and logical judgments on the various data detected, and drive the circuit breaker to disconnect or close the charging pile output; The data communication port is used to exchange data with the charging pile controller, provide real-time feedback of the device status to the charging pile controller, and receive control signals and configuration data from the charging pile controller.

2. The multifunctional protection module according to claim 1, characterized in that: The circuit breaker unit is connected with the leakage detection unit, the electric energy metering unit, the system temperature detection unit and the controller unit through an internal circuit to realize real-time data collection and processing.

3. The multifunctional protection module according to claim 1, characterized in that: The controller unit is connected to the data communication port through an internal circuit to achieve data interaction with the charging pile controller.

4. The multifunctional protection module according to claim 1, characterized in that: The system temperature detection unit is connected to the controller unit via NTC to achieve real-time monitoring of the system operating temperature.

5. The multifunctional protection module according to claim 1, characterized in that: The controller unit has the following protection functions: Leakage trip protection control; Short circuit breaking protection function; Overload trip protection function; Fault trip protection function; Over-temperature trip protection function; Over-voltage and under-voltage tripping protection function.

6. The multifunctional protection module according to claim 1, characterized in that: The electric energy metering unit can collect the current and voltage values ​​of the charging circuit in real time through the manganese copper shunt and the high-precision resistor, obtain the electric energy and power values ​​through data calculation and processing, and output the electric energy data through the data communication port.

7. The multifunctional protection module according to claim 1, characterized in that: The opening and closing control unit adopts an integrated design, and distinguishes the opening and closing operations by controlling the duration of the signal and the control sequence.

8. The multifunctional protection module according to claim 7, characterized in that: The opening operation includes protection opening and remote command opening, wherein if the protection opening operation is unsuccessful, it will be repeated until it succeeds or the maximum number of repetitions is reached.

9. The multifunctional protection module according to claim 8, characterized in that: The closing operation is performed only when a remote closing command is received and the circuit breaker is in an open state and no protection type opening occurs.

10. A car charging pile using the multifunctional protection module according to any one of claims 1 to 9, characterized in that: The charging pile controller is connected to the multifunctional protection module through a data communication port to realize remote control and status monitoring of the multifunctional protection module.

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