Charging gun homing detection device and charging pile

Abstract

The utility model discloses a charging gun homing detection device and a charging pile, the charging gun homing detection device is provided with a relay module, an induction circuit and a processing module, the induction circuit is connected with the relay module, the processing module is connected with the relay module, and the induction circuit induces a metal terminal of a charging gun itself. The structure of the charging gun does not need to be changed or a part for detection does not need to be additionally installed on the charging gun, design is simpler and more convenient, and cost is reduced; the induction circuit induces that the metal terminal of the charging gun changes the working state of the relay module, the processing module can achieve homing detection according to the changed working state, whether the charging gun is homed or not is determined, and operation is simple and convenient.

Description

Technical Field

[0001] The utility model relates to the field of charging, in particular to a charging gun return detection device and a charging pile. Background Art

[0002] At present, the technology of new energy electric vehicles is constantly developing, the market share of new energy electric vehicles is constantly increasing, and the supporting installation of charging piles in charging stations, shopping malls, and public parking lots is gradually increasing. When charging is completed, the charging gun needs to be returned to the charging pile to determine whether the charging gun is placed back in the charging pile after charging is completed. Nowadays, the return detection function of the charging gun is generally achieved through mechanical switches, magnetic induction switches, radio frequency identification, etc. However, when using a mechanical switch, it is necessary to open a hole on the charging gun seat to install the switch, and use the return contact of the charging gun to achieve detection, which is prone to contact wear, inadequate installation, etc., resulting in inaccurate detection; when using a magnetic induction switch, it is necessary to install a magnet on the charging gun and a magnetic induction switch device on the charging gun seat, which is complicated to install, and the magnet is used on high-power equipment such as the charging gun, which has the defect of short service life, and requires a customized charging gun, which is costly; when using radio frequency identification, it is necessary to affix an identification code to each gun and install an identifier on the socket, which is cumbersome to install, and requires waterproof, sun-proof, dust-proof, and damage-proof. At the same time, a sensor is installed on the gun, which is easy to be accidentally damaged by the user. Utility Model Content

[0003] The embodiment of the present application provides a charging gun return detection device and a charging pile to solve at least one problem existing in the related art. The technical solution is as follows:

[0004] In a first aspect, an embodiment of the present application provides a charging gun return detection device, comprising:

[0005] Relay module;

[0006] an induction circuit, connected to the relay module, for inducing the metal terminal of the charging gun to change the working state of the relay module;

[0007] A processing module is connected to the relay module and is used for performing homing detection according to the working state.

[0008] In one embodiment, the processing module includes a power supply unit and a processing unit, and the power supply unit is connected to the processing unit, the relay module and the sensing circuit.

[0009] In one implementation, the sensing circuit includes an oscillator and a switch unit; the oscillator is connected to the switch unit, and the switch unit is connected to the relay module and the power supply unit.

[0010] In one implementation, the oscillator includes a first inductor and a first capacitor, the first inductor and the first capacitor are connected in parallel, and the first inductor and the first capacitor are connected to the switch unit.

[0011] In one embodiment, the switching unit includes a first transistor, a second transistor, a first resistor, a second resistor, a third resistor, a second inductor, and a second capacitor; one end of the first resistor is connected to one end of the second capacitor, the collector of the first transistor, and the power supply unit, the other end of the first resistor is connected to the base of the first transistor and one end of the first inductor, the other end of the first inductor is connected to one end of the second inductor and one end of the second resistor, the other end of the second resistor is connected to the emitter of the first transistor, the other end of the second inductor is connected to the other end of the second capacitor and one end of the third resistor, the other end of the third resistor is connected to the base of the second transistor, the emitter of the second transistor is grounded, and the collector of the second transistor is connected to the relay module.

[0012] In one embodiment, the switching unit also includes a first diode, a second diode, a fourth resistor and a fifth resistor; one end of the fourth resistor is connected to the power supply unit, the other end of the fourth resistor is connected to one end of the first resistor and the cathode of the second diode, the anode of the second diode is grounded, one end of the fifth resistor is connected to the base of the second transistor, the other end of the fifth resistor is grounded, the anode of the first diode is connected to the base of the first transistor, and the cathode of the first diode is connected to one end of the first inductor.

[0013] In one embodiment, the induction circuit is arranged inside the box of the charging pile.

[0014] In one embodiment, the induction circuit is arranged on the back side of a charging gun socket for inserting a charging gun.

[0015] In one implementation, the processing module further includes a communication unit, and the communication unit is connected to the power supply unit and the processing unit.

[0016] In a second aspect, an embodiment of the present application provides a charging pile, including the charging gun return detection device.

[0017] The beneficial effects of the above technical solution include at least:

[0018] By setting up a relay module, a sensing circuit and a processing module, the sensing circuit is connected to the relay module, and the processing module is connected to the relay module. By setting the sensing circuit to sense the metal terminals of the charging gun itself, there is no need to change the structure of the charging gun or install additional components for detection on the charging gun. The design is simpler and the cost is reduced. The sensing circuit senses the metal terminals of the charging gun and changes the working state of the relay module. The processing module can implement return detection according to the changed working state to determine whether the charging gun is returned. It is simple and convenient.

[0019] 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

[0020] 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.

[0021] Figure 1 This is a circuit diagram of a charging gun return detection device according to an embodiment of the present application;

[0022] Figure 2 A schematic diagram of a charging pile according to an embodiment of the present application;

[0023] Figure 3 (a) is a schematic diagram of the AC charging gun terminal. Figure 3 (b) is a schematic diagram of the DC charging gun terminal. DETAILED DESCRIPTION

[0024] 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.

[0025] 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 in 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. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] In the related technology, when the charging gun is connected to the electric car, the communication line between the devices performs a handshake operation, the electric car outputs the real-time status of the BMS of the electric car through the communication line, and the charging pile detects the connection status between the charging gun and the electric car through the communication line in order to provide accurate and efficient charging services. When the charging is completed and the user unplugs the charging gun from the electric car, the communication line is disconnected, and the status of each other is no longer interactive. At this time, the charging pile only knows that the charging gun is detached from the electric car, but does not know whether it has returned to its place.

[0027] The utility model is further explained and illustrated below in conjunction with the accompanying drawings and specific embodiments of the specification.

[0028] Reference Figure 1 The embodiment of the present application provides a charging gun return detection device, comprising a relay module 1, a sensing circuit 2 and a processing module. The sensing circuit 2 is connected to the relay module 1 and is used to sense the metal terminal of the charging gun to change the working state of the relay module 1; the processing module is connected to the relay module 1 and is used to perform return detection according to the working state.

[0029] In one embodiment, the processing module includes a power supply unit, a processing unit and a communication unit, wherein the processing unit is connected to the communication unit; the power supply unit is connected to the processing unit, the communication unit, the relay module 1 and the sensing circuit 2, and supplies power to the processing unit, the communication unit, the relay module 1 and the sensing circuit 2. Optionally, the power supply unit may include an access power supply and a power conversion chip, wherein the power conversion chip is connected to the access power supply, and converts the access power supply into a required voltage output, for example, the final output voltage of the power conversion chip of the power supply unit is VCC.

[0030] Reference Figure 1 The induction circuit 2 includes an oscillator and a switch unit, the oscillator is connected to the switch unit, and the switch unit is connected to the relay module 1 and the output voltage VCC of the power supply unit. Optionally, the oscillator includes a first inductor L1 and a first capacitor C1, and the first inductor L1 and the first capacitor C1 are connected in parallel.

[0031] Reference Figure 1 The switch unit includes a first transistor Q1, a second transistor Q2, a first resistor R1, a second resistor R2, a third resistor R3, a second inductor L2, a second capacitor C2, a first diode D1, a second diode D2, a fourth resistor R4 and a fifth resistor R5. One end of the first resistor R1 is connected to one end of the second capacitor C2, the collector of the first transistor Q1, the cathode of the second diode D2 and the other end of the fourth resistor R4, the first resistor R1 is connected to the power supply unit (output voltage VCC) through the fourth resistor R4, the other end of the first resistor R1 is connected to the base of the first transistor Q1 and the anode of the first diode D1, and the first resistor R1 is connected to one end of the first inductor L1 through the first diode D1. The other end of the first inductor L1 is connected to one end of the second inductor L2 and one end of the second resistor R2, the other end of the second resistor R2 is connected to the emitter of the first transistor Q1, the other end of the second inductor L2 is connected to the other end of the second capacitor C2 and one end of the third resistor R3, the other end of the third resistor R3 is connected to the base of the second transistor Q2 and one end of the fifth resistor R5, the emitter of the second transistor Q2, the anode of the second diode D2 and the other end of the fifth resistor R5 are all grounded, and the collector of the second transistor Q2 is connected to the relay module 1.

[0032] like Figure 2 As shown, the induction circuit 2 is arranged inside the box of the charging pile 200. Optionally, a charging gun socket 201 is arranged inside the box. Specifically, the induction circuit 2 can be arranged on the back of the charging gun socket 201, for example, on the inner surface of the charging gun socket 201 on the opposite side of the charging gun 100. Therefore, it is not affected by sunlight and rain, is easy to install, can adapt to the installation of new and old equipment, and has a long service life. Optionally, the relay module, the processing unit, the communication unit and the power supply unit can also be arranged inside the box of the charging pile 200.

[0033] In related technologies, such as Figure 3 (a) The AC charging gun head has several metal terminals, for example: the CC port transmits the connection signal between the charging pile and the electric vehicle, the CP port transmits the communication signal, and the size of the charging current is determined by the duty cycle of the vehicle communication PWM wave. L1 is a single-phase live wire, L2 and L3 are three-phase standby ports, the N terminal is the neutral port, and the PE port is the equipment ground. Figure 3 (b) The DC charging gun head has several metal terminals, for example: CC1 and CC2 are charging connection confirmation terminals, S+ and S- are CAN communication terminals, DC+ and DC- are the positive and negative terminals of the DC power supply, A+ and A- are the positive and negative terminals of the low-voltage auxiliary power supply, and the PE terminal is the equipment ground. Therefore, both the AC charging gun head and the DC charging gun head have metal terminals that can be used for induction circuit induction in their own structures.

[0034] like Figure 1 As shown, the relay module 1 of the embodiment of the present application includes a sixth resistor R6, a third transistor D3, a coil and a switch K1, the normally open end (NO) and the normally closed end (NC) are connected to the processing unit, and the common end COM can be connected to a power line, such as a live wire.

[0035] like Figure 1 , Figure 2 As shown, the specific working process of the embodiment of the present application is described below:

[0036] 1. Assuming that the metal terminal is not close to the first inductor L1 of the oscillator, VCC supplies power to the first inductor L1 and the first capacitor C1 through the first resistor R1 and the first diode D1. The first inductor L1 and the first capacitor C1 will generate high-frequency oscillation. When the LC oscillation waveform is in the positive half cycle, the voltage of the oscillator is positive at the top and negative at the bottom. The base voltage of the first transistor Q1 is high, the base current is large, and the conduction current of the collector and emitter of the first transistor Q1 is large. The current flows into the base current of the second transistor Q2 through the second resistor R2, the second inductor L2, and the third resistor R3. At the same time, the second capacitor C2 is discharged, and the conduction current of the second transistor Q2 is large. The voltage of the electrode is small, the relay module 1 is energized, and the working state of the relay module 1 is closed (the output of the switch K1 is normally open (NO)); when the oscillation waveform of the LC is in the negative half cycle, the voltage of the oscillator is negative at the top and positive at the bottom, the base current of the first transistor Q1 becomes lower, and the conduction current of the first transistor Q1 becomes smaller. The current from VCC charges the second capacitor C2 through the fourth resistor R4, the second capacitor C2, the third resistor R3, and the second transistor Q2. The current passes through the second transistor Q2 to put it in the on state, the relay module 1 remains energized, and the working state of the relay module 1 is closed (the output of the switch K1 is normally open (NO)).

[0037] 2. Assume that the charging gun 100 is inserted into the charging gun socket 201. At this time, the metal terminal of the charging gun 100 is close to the first inductor L1 of the oscillator. Since eddy current phenomenon will be generated on the metal surface, the eddy current phenomenon will react on the first inductor L1, making the inductance smaller, and the LC oscillator stops oscillating. For DC signals, the first inductor L1 and the second inductor L2 are equivalent to short circuits, and the first capacitor C1 and the second capacitor C2 are equivalent to open circuits. The base current of the first transistor Q1 becomes smaller, and most of the current flows to the third resistor R3 and the fifth resistor R5 through the first diode D1 and flows to the ground. Therefore, the base current of the second transistor Q2 is very small, and the second transistor Q2 is in the cut-off state. The power supply of the relay module does not form a loop and is in the power-off state. The working state of the relay module 1 is the disconnected state (the output of the switch K1 is the normally closed state (NC)).

[0038] It should be noted that the processing unit can perform a return detection according to the working state. For example, when the working state of the relay module 1 is a closed state or a disconnected state, the levels of NO and NC will change. For example, when NC is a high level and / or NO is a low level, the processing unit can know that the charging gun 100 has been returned. When N0 is a high level and / or NC is a low level, the processing unit can know that the charging gun 100 has not been returned.

[0039] In the embodiment of the present application, the processing unit can be composed of any one or more processor chips including MCU, FPGA, CPLD, DSP, ARM, etc. Among them, the communication unit can also upload the homing detection result of the processing unit to the server of the charging pile 200, and realize the homing status query and reporting with the server through the communication module, so as to push it to the user or staff through the server, and return the charging gun in time to avoid damage to the charging gun caused by the harsh environment. For example, the server can determine whether the charging gun is in an idle and unhomed state (the charging gun is not homed and the electric car is not connected) according to the homing state of the charging gun and the connection state of the charging gun and the electric vehicle, and then give a prompt to remind the user and the staff to operate, so as to strive to return the charging gun as soon as possible.

[0040] Through the induction circuit 2 of the embodiment of the present application, the principle of non-contact metal eddy current detection is utilized to realize the return detection of the charging pile charging gun. Online automatic and reliable detection is more convenient without the need for manual troubleshooting. The sensitivity is adjustable, the proximity detection distance is adjustable, the installation is easy, the cost is low, and the stability is high.

[0041] like Figure 2 As shown, an embodiment of the present application further provides a charging pile 200, including the above-mentioned charging gun return detection device.

[0042] like Figure 2 As shown, optionally, the charging pile 200 may further include a display screen 202, which is connected to the processing unit and includes but is not limited to displaying the charging time, the return status of the charging gun 100, text content prompting the user to return the charging gun 100, and the like.

[0043] 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 deformations or substitutions without violating the spirit of the utility model. These equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A charging gun return detection device, characterized in that: include: Relay module; an induction circuit, connected to the relay module, for inducing the metal terminal of the charging gun to change the working state of the relay module; A processing module is connected to the relay module and is used for performing homing detection according to the working state.

2. The charging gun return detection device according to claim 1, characterized in that: The processing module includes a power supply unit and a processing unit, and the power supply unit is connected to the processing unit, the relay module and the sensing circuit.

3. The charging gun return detection device according to claim 2, characterized in that: The induction circuit includes an oscillator and a switch unit; the oscillator is connected to the switch unit, and the switch unit is connected to the relay module and the power supply unit.

4. The charging gun return detection device according to claim 3, characterized in that: The oscillator includes a first inductor and a first capacitor, the first inductor and the first capacitor are connected in parallel, and the first inductor and the first capacitor are connected to the switch unit.

5. The charging gun return detection device according to claim 4, characterized in that: The switch unit includes a first transistor, a second transistor, a first resistor, a second resistor, a third resistor, a second inductor, and a second capacitor; one end of the first resistor is connected to one end of the second capacitor, the collector of the first transistor, and the power supply unit, the other end of the first resistor is connected to the base of the first transistor and one end of the first inductor, the other end of the first inductor is connected to one end of the second inductor and one end of the second resistor, the other end of the second resistor is connected to the emitter of the first transistor, the other end of the second inductor is connected to the other end of the second capacitor and one end of the third resistor, the other end of the third resistor is connected to the base of the second transistor, the emitter of the second transistor is grounded, and the collector of the second transistor is connected to the relay module.

6. The charging gun return detection device according to claim 5, characterized in that: The switching unit also includes a first diode, a second diode, a fourth resistor and a fifth resistor; one end of the fourth resistor is connected to the power supply unit, the other end of the fourth resistor is connected to one end of the first resistor and the cathode of the second diode, the anode of the second diode is grounded, one end of the fifth resistor is connected to the base of the second transistor, the other end of the fifth resistor is grounded, the anode of the first diode is connected to the base of the first transistor, and the cathode of the first diode is connected to one end of the first inductor.

7. The charging gun return detection device according to any one of claims 2 to 5, characterized in that: The induction circuit is arranged inside the box of the charging pile.

8. The charging gun return detection device according to claim 6, characterized in that: The induction circuit is arranged on the back side of a charging gun socket for inserting a charging gun.

9. The charging gun return detection device according to any one of claims 2 to 5, characterized in that: The processing module further includes a communication unit, and the communication unit is connected to the power supply unit and the processing unit.

10. A charging pile, characterized in that: It comprises a charging gun return detection device as described in any one of claims 1 to 9.

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