A charging protection circuit and a charging pile

Abstract

The utility model discloses a charging protection circuit and a charging pile. The utility model provides a power module, a relay module connected to the power module and used for connecting a charging vehicle, and a charging monitoring module including a main control module, an alarm module and a leakage current detection module. The main control module is connected to the power module, the relay module, the alarm module and the leakage current detection module. The alarm module and the relay module are connected to the power module. The leakage current detection module is arranged on a connection line connecting the relay module and the charging vehicle. When the leakage current detection module detects a leakage current, the main control module controls the relay module to be disconnected, thereby disconnecting the power module to stop charging the charging vehicle, which is beneficial to avoiding the occurrence of safety accidents and improving safety.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a charging protection circuit and a charging pile. Background Art

[0002] At present, with the development of new energy technology, new energy vehicles are gradually entering people's daily lives. New energy vehicles include electric cars, electric bicycles, etc. The daily driving of new energy vehicles depends on batteries, and the batteries need to be charged at regular intervals.

[0003] However, there are many potential risks in the vehicle charging process. If there are no effective charging protection measures, it is easy to cause damage to the charging pile or even cause safety accidents such as fire. Therefore, how to effectively monitor the charging process of the vehicle is crucial to safety. Utility Model Content

[0004] The embodiment of the present application provides a charging protection circuit and a charging pile to solve at least one problem existing in the related art. The technical solution is as follows:

[0005] In a first aspect, an embodiment of the present application provides a charging protection circuit, including:

[0006] Power module;

[0007] A relay module, connected to the power module and used to connect to a charging vehicle;

[0008] The charging monitoring module includes a main control module, an alarm module and a leakage current detection module; the main control module is connected to the power module, the relay module, the alarm module and the leakage current detection module, the alarm module and the relay module are connected to the power module, and the leakage current detection module is arranged on the connection line connecting the relay module and the charging vehicle.

[0009] In one implementation, the leakage current detection module is a current transformer, and the leakage current detection module is arranged on the live wire and the neutral wire of the connection line.

[0010] In one embodiment, the charging monitoring module also includes a current acquisition module, which is connected to the main control module, and the current acquisition module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, an operational amplifier, a first capacitor, a second capacitor and an inductor; one end of the first resistor is connected to the power supply module, the other end of the first resistor is connected to one end of the second resistor and the non-inverting input end of the operational amplifier, the other end of the second resistor is grounded, one end of the third resistor is connected to one end of the inductor, the other end of the inductor is grounded, the other end of the third resistor is connected to the inverting input end of the operational amplifier and one end of the fourth resistor, the other end of the fourth resistor is connected to the output end of the operational amplifier and one end of the fifth resistor, the first capacitor is connected in parallel with the fourth resistor, the other end of the fifth resistor is connected to one end of the second capacitor and the main control module, and the other end of the second capacitor is grounded.

[0011] In one embodiment, the charging monitoring module also includes a temperature detection module, which is connected to the main control module, and the temperature detection module includes a sixth resistor, a seventh resistor, an NTC thermistor and a bidirectional transient suppression diode; one end of the sixth resistor is connected to one end of the NTC thermistor, the other end of the sixth resistor is connected to the power module, one end of the seventh resistor and one end of the bidirectional transient suppression diode, the other end of the NTC thermistor and the other end of the bidirectional transient suppression diode are all grounded, and the other end of the seventh resistor is connected to the main control module.

[0012] In one embodiment, the alarm module includes an LCD display unit, the LCD display unit includes a driver chip and an LCD display screen, and the driver chip is connected to the main control module and the LCD display screen.

[0013] In one implementation, the alarm module includes a voice unit, the voice unit includes a voice chip and a speaker, and the voice chip is connected to the main control module and the speaker.

[0014] In one embodiment, the charging monitoring module further includes a communication module, wherein the communication module is connected to the power module and the main control module, and the communication module is used to connect to a server.

[0015] In one embodiment, the charging monitoring module further includes a touch button module, and the touch button module is connected to the main control module.

[0016] In one embodiment, the charging monitoring module further includes a fuse, and the fuse is connected to the connection line.

[0017] In a second aspect, an embodiment of the present application provides a charging pile, including the charging protection circuit.

[0018] The beneficial effects of the above technical solution include at least:

[0019] By setting a power module, a relay module connected to the power module and used to connect to a charging vehicle, and a charging monitoring module including a main control module, an alarm module and a leakage current detection module, the main control module is connected to the power module, the relay module, the alarm module and the leakage current detection module, the alarm module and the relay module are connected to the power module, and the leakage current detection module is arranged on a connection line connecting the relay module and the charging vehicle. When the leakage current detection module detects a leakage current, the main control module controls the relay module to disconnect, thereby disconnecting the power module to stop charging the charging vehicle, which is beneficial to avoiding the occurrence of safety accidents and improving safety.

[0020] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0022] Figure 1 This is a block diagram of a charging protection circuit according to an embodiment of the present application;

[0023] Figure 2 This is a circuit diagram of a current acquisition module according to an embodiment of the present application;

[0024] Figure 3 This is a circuit diagram of the temperature detection module of an embodiment of the present application;

[0025] Figure 4 This is a circuit diagram of a relay module according to an embodiment of the present application;

[0026] Figure 5 This is a block diagram of a charging pile according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0028] The terms "first", "second", "third", etc. in the specification and claims of this application and the drawings are only used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. Reference to "embodiments" herein means that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase at various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0029] The utility model is further explained and illustrated below in conjunction with the accompanying drawings and specific embodiments of the specification.

[0030] Reference Figure 1 An embodiment of the present application provides a charging protection circuit, including a power module, a relay module and a charging monitoring module, wherein the relay module is connected to the power module and is used to connect to a charging vehicle.

[0031] Reference Figure 1 Optionally, the charging monitoring module includes a main control module, an alarm module and a leakage current detection module. The main control module is connected to the power module, the relay module, the alarm module and the leakage current detection module. The alarm module is connected to the power module; the leakage current detection module is arranged on the connection line connecting the relay module and the charging vehicle, and is used to detect the leakage current of the connection line.

[0032] In the embodiment of the present application, the leakage current detection module is a current transformer, and the leakage current detection module is arranged on the live wire and the neutral wire of the connection line, so that the live wire and the neutral wire of the connection line pass through the current transformer to realize leakage current detection; the main control module obtains the leakage current detection result of the current transformer in real time. If the live wire current is not equal to the neutral wire current, or is not equal and is greater than a certain threshold value (for example, greater than 30mA), it indicates leakage, which is equivalent to detecting leakage current. At this time, the main control module controls the relay module to disconnect, thereby disconnecting the power supply of the power supply module to the charging vehicle, stopping the charging of the charging vehicle, and realizing leakage current protection, which is conducive to avoiding the occurrence of safety accidents and improving safety.

[0033] Reference Figure 1In the embodiment of the present application, the charging monitoring module also includes a current acquisition module, a temperature detection module, a voltage detection module, a communication module, a touch button module and a fuse.

[0034] Reference Figure 1 It should be noted that the relay module, the leakage current detection module, the current acquisition module, and the fuse can form a charging branch, which can charge a charging vehicle. In some embodiments, there can be multiple charging branches, which are jointly controlled by the main control module. The control principle of each charging branch is the same, so this application takes one of the charging branches as an example for explanation, and no further description is given. Optionally, the charging vehicle is an electric bicycle, and in other embodiments it can also be an electric car.

[0035] Reference Figure 1 and Figure 2 In the embodiment of the present application, the current acquisition module is connected to the above-mentioned connection line and the main control module, and the current acquisition module includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, an operational amplifier U1, a first capacitor C1, a second capacitor C2 and an inductor L1; one end of the first resistor R1 is connected to the power supply module, the other end of the first resistor R1 is connected to one end of the second resistor R2 and the in-phase input end of the operational amplifier U1, the other end of the second resistor R2 is grounded, one end of the third resistor R3 is connected to one end of the inductor L1, the other end of the inductor L1 is grounded, the other end of the third resistor R3 is connected to the inverting input end of the operational amplifier U1 and one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to the output end of the operational amplifier U1 and one end of the fifth resistor R5, the first capacitor C1 is connected in parallel with the fourth resistor R4, the other end of the fifth resistor R5 is connected to one end of the second capacitor C2 and the AD interface of the main control module, and the other end of the second capacitor C2 is grounded. It should be noted that when the AD interface of the main control module detects that the load current exceeds a certain set value, such as 5A, the main control module controls the relay module to disconnect, thereby disconnecting the power supply of the power module to the charging vehicle, stopping charging the charging vehicle, and realizing load current protection (overcurrent protection).

[0036] In an embodiment of the present application, the voltage detection module can use an existing voltage detection circuit or a voltage detection chip to detect the voltage on the connection line. The main control module obtains the voltage detected by the voltage detection module, and calculates the power in combination with the load current detected by the voltage detection module. When the power is less than a threshold value (for example, 30W) and the duration reaches a certain set time threshold (for example, 30 minutes), it is determined that the battery of the charging vehicle is fully charged and is in a floating charge state. At this time, the main control module controls the relay module to disconnect, thereby realizing floating charge protection, thereby disconnecting the power supply of the power module to the charging vehicle.

[0037] Reference Figure 1 and Figure 3 In the embodiment of the present application, the temperature detection module is connected to the main control module, and the temperature detection module includes a sixth resistor R6, a seventh resistor R7, an NTC thermistor R and a bidirectional transient suppression diode T; one end of the sixth resistor R6 is connected to one end of the NTC thermistor R, the other end of the sixth resistor R6 is connected to the power module, one end of the seventh resistor R7 and one end of the bidirectional transient suppression diode T, the other end of the NTC thermistor R and the other end of the bidirectional transient suppression diode T are grounded, and the other end of the seventh resistor R7 is connected to the ADC1 interface of the main control module. Optionally, the size of the NTC thermistor R is 10K, and the thermal index is 3435; the charging protection circuit can be set on the circuit board, so the temperature detection module can detect the temperature of the circuit board, that is, the temperature of the overall charging protection circuit. It should be noted that when the ADC1 interface of the main control module samples a temperature higher than 80°C, the main control module will control the relay module to disconnect, thereby disconnecting the power module to stop charging the charging vehicle and achieve over-temperature protection.

[0038] Reference Figure 1 In the embodiment of the present application, the alarm module includes an LCD display unit and a voice unit, and other embodiments may include one of the LCD display unit and the voice unit. Optionally, the LCD display unit includes a driver chip and an LCD display screen, the driver chip is connected to the main control module and the LCD display screen, and the model of the driver chip includes but is not limited to HT1621. Among them, the voice unit includes a voice chip and a speaker, the voice chip is connected to the main control module and the speaker, and the model of the voice chip includes but is not limited to NV040C.

[0039] In an embodiment of the present application, the communication module is connected to the power module and the main control module, the communication module is used to connect to the server, and the communication module can be a 4G or 5G full network access module.

[0040] Reference Figure 1 It should be noted that when the main control module implements any of the functions of leakage current protection, overcurrent protection, overtemperature protection and floating charge protection, the main control module will control the LCD display unit and the voice unit to remind the user, such as displaying a warning message on the LCD display and playing the warning message through the speaker. At the same time, the warning information can also be uploaded to the server through the communication module, so that the server can display the warning information on the mini program, web page or public account, so that the user can remotely understand the warning information on the terminal, and the maintenance personnel can also view the warning information on the terminal and perform timely maintenance, which is convenient, fast and more humane.

[0041] Reference Figure 1In the embodiment of the present application, a touch button module is connected to the main control module. The touch button module may include 12 capacitive touch buttons. The touch button module may be operated by users, such as selecting charging time, payment method, etc. It may also be used by maintenance personnel to set relevant thresholds such as temperature, leakage current, load current, power, time, etc., without specific limitation.

[0042] Reference Figure 1 In the embodiment of the present application, the fuse is connected to the connection line. By setting the fuse, the safety is further improved on the basis of the relay module.

[0043] In the embodiment of the present application, the power supply module includes surge protection components, rectifier components, filter components, switch components, transformers and other components to provide different power supply voltages for different modules and circuits. The power supply voltage includes but is not limited to V IN1, VI N2, +3.3V, and VC for charging the charging vehicle, VC = 220VAC.

[0044] Reference Figure 1 and Figure 4 In the embodiment of the present application, the relay module includes a transistor Q, a relay unit K1, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a diode D, and a light emitting diode LD. Among them, one end of the ninth resistor R9 is connected to the control interface D0 of the main control module, the common terminal COM of the relay unit K1 is used to connect to the charging vehicle, and the normally open terminal NO is used to connect to the power module. The connection line can be, for example, a line between the normally open terminal NO and the common terminal COM.

[0045] The working principle is explained below: when the main control module detects at least one of the following conditions: leakage current, load current exceeds the set threshold value such as 5A, the battery is fully charged and in a floating charge state, and the temperature is higher than 80°C, the main control module controls the control interface D0 to output a high level, the transistor turns on Q, and the coil of the relay unit K1 is energized. At this time, the switch of the relay unit K1 changes from connecting to the normally open terminal NO to connecting to the normally closed terminal NC. At this time, the common terminal COM is disconnected from the normally open terminal NO of the VC (VC=220VAC) provided by the power module, thereby disconnecting the relay module and stopping the power supply to the charging vehicle, thereby achieving the purpose of improving safety.

[0046] In the embodiment of the present application, the main control module can be composed of any one or more processor chips including MCU, FPGA, CPLD, DSP, ARM, etc. For example, the embodiment of the present application takes the STM32F103VET6 chip as an example, which has a 12-bit AD sampling circuit and a serial communication interface. In addition, the embodiment of the present application does not involve the improvement of the control method performed by the main control module. The threshold comparison and control-related methods and processes mentioned in the embodiment of the present application are all based on the data processing level of the prior art. The embodiment of the present application does not involve the method and any software improvements.

[0047] In the embodiment of the present application, multiple functional detections including leakage current, overcurrent, overtemperature, and floating charge status detection are integrated, which can effectively improve the safety of the charging vehicle during charging, reduce or avoid the occurrence of fire, and help avoid battery overcharging and overheating, thereby increasing the battery life of the charging vehicle.

[0048] like Figure 5 As shown, in an embodiment of the present application, a charging pile is also provided, including the above-mentioned charging protection circuit.

[0049] The above is a specific description of the preferred implementation of the utility model, but the utility model is not limited to the implementation method. Technical personnel familiar with the field can also make various equivalent modifications or substitutions without violating the spirit of the utility model, and all are included in the scope defined by the claims of this application.

Claims

1. A charging protection circuit, characterized in that: include: Power module; A relay module, connected to the power module and used to connect to a charging vehicle; The charging monitoring module includes a main control module, an alarm module and a leakage current detection module; the main control module is connected to the power module, the relay module, the alarm module and the leakage current detection module, the alarm module and the relay module are connected to the power module, and the leakage current detection module is arranged on the connection line connecting the relay module and the charging vehicle.

2. The charging protection circuit according to claim 1, characterized in that: The leakage current detection module is a current transformer, and the leakage current detection module is arranged on the live wire and the neutral wire of the connection line.

3. The charging protection circuit according to claim 1, characterized in that: The charging monitoring module also includes a current acquisition module, which is connected to the main control module. The current acquisition module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, an operational amplifier, a first capacitor, a second capacitor and an inductor; one end of the first resistor is connected to the power supply module, the other end of the first resistor is connected to one end of the second resistor and the non-inverting input end of the operational amplifier, the other end of the second resistor is grounded, one end of the third resistor is connected to one end of the inductor, the other end of the inductor is grounded, the other end of the third resistor is connected to the inverting input end of the operational amplifier and one end of the fourth resistor, the other end of the fourth resistor is connected to the output end of the operational amplifier and one end of the fifth resistor, the first capacitor is connected in parallel with the fourth resistor, the other end of the fifth resistor is connected to one end of the second capacitor and the main control module, and the other end of the second capacitor is grounded.

4. The charging protection circuit according to claim 1, characterized in that: The charging monitoring module also includes a temperature detection module, which is connected to the main control module. The temperature detection module includes a sixth resistor, a seventh resistor, an NTC thermistor and a bidirectional transient suppression diode; one end of the sixth resistor is connected to one end of the NTC thermistor, the other end of the sixth resistor is connected to the power module, one end of the seventh resistor and one end of the bidirectional transient suppression diode, the other end of the NTC thermistor and the other end of the bidirectional transient suppression diode are all grounded, and the other end of the seventh resistor is connected to the main control module.

5. The charging protection circuit according to any one of claims 1 to 4, characterized in that: The alarm module includes an LCD display unit, and the LCD display unit includes a driving chip and an LCD display screen. The driving chip is connected to the main control module and the LCD display screen.

6. The charging protection circuit according to any one of claims 1 to 4, characterized in that: The alarm module includes a voice unit, and the voice unit includes a voice chip and a speaker. The voice chip is connected to the main control module and the speaker.

7. The charging protection circuit according to any one of claims 1 to 4, characterized in that: The charging monitoring module also includes a communication module, which is connected to the power module and the main control module, and is used to connect to a server.

8. The charging protection circuit according to any one of claims 1 to 4, characterized in that: The charging monitoring module also includes a touch button module, and the touch button module is connected to the main control module.

9. The charging protection circuit according to any one of claims 1 to 4, characterized in that: The charging monitoring module also includes a fuse, which is connected to the connection line.

10. A charging pile, characterized in that: Comprising a charging protection circuit as described in any one of claims 1-9.

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