Detection equipment for electric bicycle charger

Abstract

The utility model discloses a detection device for an electric bicycle charger, which belongs to the field of electric bicycle detection and comprises a relay K3 for realizing short circuit / charging conversion, and when short circuit detection is carried out, a relay K4 is connected between two normally open ends of the relay K3; a relay K6 and a relay K5 are matched to realize switching of a reverse connection / charging switching detection state; a charging current transformer and a reverse connection current transformer are arranged between the relay K3 and the relay K6, so that the detection precision is ensured; according to the equipment, through cooperation of the relays, switching among a charging detection state, a short circuit detection state and a reverse connection detection state is realized, a reverse connection and short circuit test environment does not need to be rebuilt, the phenomena of repeated and disordered wiring are effectively avoided, the time period is shortened, and the detection efficiency is improved; the equipment is simple in structure and principle and convenient to implement, operate and maintain, and has good popularization and application value.

Description

Technical Field

[0001] The utility model belongs to the field of electric bicycle detection, and particularly relates to a detection device for an electric bicycle charger. Background Technique

[0002] As a key device for the energy source of an electric bicycle, the performance and safety of the charger are directly related to the normal use of the electric bicycle and the personal safety of users. Through strict detection, it can be ensured that the charger has stable voltage and current output, preventing battery damage caused by voltage fluctuations or excessive current, and even preventing safety accidents such as fires. At the same time, detection also helps to discover and eliminate potential design defects or production problems, thereby ensuring the reliability and durability of the electric bicycle charger and providing a safer and more convenient charging experience for users.

[0003] Currently, with the promulgation and implementation of new standards, when conducting abnormal working tests on electric chargers, using conventional detection measures, it is necessary to separately build reverse connection and short - circuit test environments, and there are often problems such as repetition and random wiring, resulting in a long time cycle and low detection efficiency. Moreover, when using existing detection measures for testing, once the charger undergoes a short - circuit, a large current will be generated, lacking self - protection functions and posing a great safety hazard.

[0004] It can be seen that for the detection of electric bicycle chargers, using existing detection measures, due to the need to separately build reverse connection and short - circuit test environments, there are often problems such as repetition and random wiring, resulting in a long time cycle and low detection efficiency. Content of the Utility Model

[0005] In order to overcome the above - mentioned technical defects, the utility model provides a detection device for an electric bicycle charger, which can solve the technical problems of existing detection measures, such as the need to separately build misconnection and short - circuit test environments, often resulting in repetition and random wiring problems, leading to a long time cycle and low detection efficiency.

[0006] In order to achieve the above - mentioned purpose, the utility model adopts the following technical content:

[0007] A detection device for an electric bicycle charger includes a relay K3, a relay K4, a relay K5, and a relay K6;

[0008] When in the charging detection state, the output end of the charger to be tested, the first normally - closed end of the relay K3, the normally - closed end of the relay K6, the first normally - closed end of the relay K5, and the positive pole of the battery are connected in sequence; a charging current transformer is connected between the first normally - closed end of the relay K3 and the normally - closed end of the relay K6;

[0009] The negative electrode of the battery, the second normally closed terminal of the relay K3, and the second normally closed terminal of the relay K5 are connected in sequence, and the second normally closed terminal of the relay K5 is grounded;

[0010] When in the short-circuit detection state, the output terminal of the charger under test, the first normally open terminal of the relay K3, the relay K4, the second normally open terminal of the relay K3, and the negative electrode of the battery are connected in sequence;

[0011] When in the reverse connection detection state, the output terminal of the charger under test, the first normally closed terminal of the relay K3, the normally open terminal of the relay K6, and the first normally open terminal of the relay K5 are connected in sequence, and the first normally open terminal of the relay K5 is grounded;

[0012] The negative electrode of the battery, the second normally closed terminal of the relay K3, the second normally open terminal of the relay K5, and the positive electrode of the battery are connected in sequence; An anti-reverse current transformer is connected between the first normally closed terminal of the relay K3 and the normally open terminal of the relay K6.

[0013] Further, a protection relay K2 is connected between the relay K3 and the negative electrode of the battery.

[0014] Further, the model of the protection relay K2 is Relay-SPST relay.

[0015] Further, the protection relay K2 is controlled through a controller.

[0016] Further, the relay K3, the relay K4, the relay K5, and the relay K6 are respectively electrically connected to the controller.

[0017] Further, the model of the controller is the PLC industrial control board ZK2N-24.

[0018] Further, the controller is connected to an industrial control liquid crystal screen.

[0019] Further, a charger input switching circuit is further included, and the charger input switching circuit includes relays K7, K8, and K9;

[0020] One ends of the normally open feet of the relays K7, K8, and K9 are connected in parallel to the first normally closed terminal of the relay K3; The other ends of the normally open feet of the relays K7, K8, and K9 are respectively connected to the input positive electrodes of three chargers.

[0021] Further, a battery input switching circuit is further included, and the battery input switching circuit includes relays K10, K11, and K12;

[0022] One end of the normally open pins of the relay K10, the relay K11, and the relay K12 is connected in parallel to the battery output terminal; the other ends of the normally open pins of the relay K10, the relay K11, and the relay K12 are respectively connected to the input positive electrodes corresponding to the three types of batteries.

[0023] Further, the relay K7, the relay K8, the relay K9, the relay K10, the relay K11, and the relay K12 are all electrically connected to the controller.

[0024] Compared with the prior art, the present utility model has the following beneficial effects:

[0025] The present utility model provides a detection device for an electric bicycle charger. This detection device includes a relay K3 for realizing short - circuit / charging conversion. When performing short - circuit detection, a relay K4 is connected between the two normally open terminals of the relay K3; the cooperation between the relay K6 and the relay K5 realizes the switching of the reverse - connection / charging detection state; and a charging current transformer and a reverse - connection current transformer are arranged between the relay K3 and the relay K6 to ensure the detection accuracy. Through the cooperation of multiple relays, this device realizes the switching of the charging detection state, the short - circuit detection state, and the reverse - connection detection state, without the need to rebuild the reverse - connection and short - circuit test environments, effectively avoiding the phenomena of repeated and messy wiring, shortening the time cycle, and improving the detection efficiency. The structure and principle of this device are simple, facilitating implementation and operation and maintenance, and having good popularization and application value.

[0026] Preferably, in the present utility model, a protection relay K2 is connected between the relay K3 and the battery negative electrode. Under normal circumstances, the protection relay K2 is in a normally closed state. When an emergency occurs, by releasing the protection relay K2, the AC input circuit of the charger is disconnected, and further the DC output circuit of the charger is disconnected, entering an emergency stop state. In this way, this device provides a protection mechanism. When the charger has a short - circuit and generates a large current, the device realizes the self - protection function, cuts off the voltage, and improves the safety performance.

[0027] Further preferably, in the present utility model, the model of the protection relay K2 is a Relay - SPST relay. The Relay - SPST relay has good performance, ensuring the stability and reliability of the device operation.

[0028] Further preferably, in the present utility model, the protection relay K2 is controlled by the controller, which can realize automatic protection and enhance the automation and intelligence of the device.

[0029] Preferably, in the present utility model, all relays are electrically connected to the controller, enabling the device to realize automatic control and detection, improving the detection efficiency and accuracy, and reducing the risk of manual operation.

[0030] Preferably, in the present utility model, the model of the controller is the PLC industrial control board ZK2N-24, which ensures the stability and reliability of the controller and provides strong support for the automatic control of the device.

[0031] Preferably, in the present utility model, the industrial control liquid crystal screen connected to the controller makes the display of the detection result more intuitive.

[0032] Preferably, in the present utility model, the setting of the charger input switching circuit enables the device to be compatible with chargers of multiple models, improving the versatility and practicality of the device.

[0033] Further preferably, in the present utility model, the setting of the battery input switching circuit enables the device to be applicable to batteries of multiple models, expanding the applicable range of the device and improving the flexibility of the device.

[0034] Further preferably, in the present utility model, all the relays of the switching circuits are electrically connected to the controller, enabling the device to achieve automatic switching control and improving the automation level and operation efficiency of the device. Description of the Drawings

[0035] Figure 1 It is the electrical schematic diagram of a detection device for an electric bicycle charger provided by an embodiment of the present utility model;

[0036] Figure 2 It is the schematic diagram of the battery input switching circuit of a detection device for an electric bicycle charger provided by an embodiment of the present utility model;

[0037] Figure 3 It is the schematic diagram of the controller terminals of a detection device for an electric bicycle charger provided by an embodiment of the present utility model;

[0038] Figure 4 It is the liquid crystal display interface diagram provided by an embodiment of the present utility model. Detailed Embodiments

[0039] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer, the following specific embodiments are used to further elaborate on the present utility model in detail. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Components of the embodiments of the present utility model described and illustrated in the drawings herein can be arranged and designed in a variety of different configurations.

[0041] Therefore, the detailed description of the embodiments of the present utility model provided in the drawings below is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0042] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0043] In the description of the embodiments of the present utility model, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, it is only for the convenience of describing the present utility model 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 should not be construed as a limitation of the present utility model. In addition, terms such as "first", "second", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0044] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0045] In the description of the embodiments of the present utility model, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "coupled" are to be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0046] The present utility model will be further described in detail below with reference to the accompanying drawings:

[0047] Embodiment

[0048] As mentioned in the background art, when using conventional detection measures, it is necessary to separately set up reverse connection and short - circuit test environments, and problems such as repetition and random wiring often occur, resulting in a long time cycle and low detection efficiency. Moreover, when using existing detection measures for testing, once the charger is short - circuited, a large current will be generated, lacking self - protection functions and posing a great safety hazard.

[0049] To further understand the content of this technical solution, the technical problems are described in more detail:

[0050] With the promulgation and implementation of the new standard GB 42295 - 2022, it is necessary to conduct abnormal working tests on electric bicycle chargers, specifically including reverse connection and short - circuit tests. However, current test measures or test equipment require a long time to set up the test environment, not only with a long test cycle, but also unable to accurately measure time and current, and at the same time, safety cannot be guaranteed. Existing test aids no longer meet the test requirements of the new standard.

[0051] Regarding reverse connection (also called wrong connection), the usual operation method is as follows:

[0052] First, connect the input end of the charger to the 220V power supply, and connect the output end to the load to make the charger work normally, displaying the normal output working voltage and current values of the charger. Subsequently, reverse - connect the positive and negative poles of the output end of the charger to the load and keep it for 10 minutes, then detect whether the current value is less than 5 mA and make a judgment and response. Finally, after the reverse connection ends, connect the charger to the load normally to work and display the output voltage value and current value of the charger.

[0053] Regarding short - circuit, the usual operation method is as follows:

[0054] First, make the charger in a normal working state, displaying the output voltage value and current value of the charger. Subsequently, short - circuit the positive and negative poles of the output end of the charger for 15S and then withdraw. After the short - circuit ends, connect the load to the charger normally to make it work normally and display its output voltage value and current value.

[0055] To solve the above problems, this embodiment provides a detection device for an electric bicycle charger. Using this device can make the detection operation convenient and fast, solve the problems of repetition and random wiring, and shorten the inspection time; during the detection process, the time, current, and voltage required during the test can be displayed in real - time; improve the accuracy, convenience, and safety of the test process.

[0056] Such as Figure 1As shown in the figure, this embodiment provides a detection device for an electric bicycle charger, that is, a detection circuit for abnormal operation of an electric bicycle charger, including: a charger input switching circuit, a battery input switching circuit, a short-circuit / charging conversion relay, a reverse connection / charging conversion relay, a short-circuit test relay, a charging current transformer, a reverse connection current transformer, and a controller; here, the detection device also includes a housing, a power supply, and corresponding function buttons.

[0057] As Figure 3 shown in the figure, in this embodiment, the controller uses a PLC industrial control board ZK2N-24 (hereinafter referred to as PLC), and here, other compatible models can also be used.

[0058] As Figure 2 shown in the figure, the battery input switching circuit includes relays K10, K11, and K12; among them, one ends of the normally open pins of relays K10, K11, and K12 are connected in parallel to the battery output terminal, and the other ends of the normally open pins are respectively connected to the input positive electrodes of three types of batteries.

[0059] The charger input switching circuit includes relays K7, K8, and K9; among them, one ends of the normally open pins of relays K7, K8, and K9 are connected in parallel to the first normally closed terminal of relay K3, and the other ends of the normally open pins are respectively connected to the input positive electrodes of three types of chargers.

[0060] Among them, the coil terminals of relays K10 and K7 are connected to Y5 of the PLC; the coil terminals of relays K11 and K8 are connected to Y6 of the PLC; the coil terminals of relays K12 and K8 are connected to Y5 of the PLC, and the coil terminals of relays K11 and K8 are connected to Y7 of the PLC.

[0061] In this embodiment, a protection circuit composed of a protection relay K2 is also provided; one end of the normally open terminal of the protection relay K2 is connected to the battery negative electrode (i.e., grounded); the other end is connected to the second normally closed terminal of relay K3; the coil terminal of the protection relay K2 is controlled by Y1 of the PLC.

[0062] In this embodiment, the short-circuit / charging conversion relay is relay K3, the short-circuit test relay is relay K4, and relays K6 and K5 cooperate to form a reverse connection / charging conversion relay; the normally open terminal of relay K3 is connected to relay K4, and relay K4 realizes the short-circuit simulation function; the coil of relay K3 is connected to the PLC control terminal Y2, and the coil of relay K4 is connected to the PLC control terminal Y4.

[0063] Relay K6 is connected to the first normally closed terminal of relay K3 and the first normally closed terminal of relay K5 to realize the split collection of charging current and reverse connection current; the coil terminal of relay K6 is controlled by the PLC control terminal Y10.

[0064] The second normally-closed terminal of relay K5 is connected to the second normally-closed terminal of relay K3, and the first normally-closed terminal is connected to relay K6, completing the switching of the battery reverse connection path. The coil terminal of relay K5 is controlled by the PLC control terminal Y3.

[0065] A charging current transformer is connected between the first normally-closed terminal of relay K3 and the normally-closed terminal of relay K6; a reverse connection current transformer is connected between the first normally-closed terminal of relay K3 and the normally-open terminal of relay K6.

[0066] In this embodiment, the charging current transformer uses the JLK17 model transformer of Wuhan Jingliang Electronics Co., Ltd.

[0067] In this embodiment, the reverse connection current transformer uses the JLC26 model transformer of Wuhan Jingliang Electronics Co., Ltd.

[0068] In this embodiment, the PLC is also connected to an industrial control liquid crystal display screen for displaying the detected current values and voltage values in each detection state.

[0069] In this embodiment, the specific control of the PLC is as follows:

[0070] The charger input switching circuit consists of three relays, namely the PLC and relays K7, K8, and K9. Among them, the PLC control port Y5 controls relay K7, the PLC control port Y6 controls relay K8, and the PLC control port Y7 controls relay K9 to achieve the conversion of the charger input path;

[0071] The battery input switching circuit consists of three relays, namely the PLC and relays K10, K11, and K12. Among them, the PLC control port Y5 controls relay K10, the PLC control port Y6 controls relay K11, and the PLC control port Y7 controls relay K12 to achieve the synchronous conversion of the battery input path and the charger input path.

[0072] The control short-circuit / charging conversion circuit consists of three relays, namely the PLC, relay K3, short-circuit test relay K4, and control protection relay K2. Among them, the PLC control port Y2 controls relay K3, the PLC control port Y4 controls relay K4, and the PLC control port Y1 controls relay K2. The control protection relay K2 is normally closed by default. The PLC control port Y2 controls relay K3 to pull in, and the PLC control port Y4 controls relay K4 to pull in with a time delay to achieve the short-circuit test state.

[0073] The reverse connection / charging conversion relay circuit consists of four relays: a PLC, relay K3, battery reverse connection relay K5, current path switching relay K6, and control protection relay K2. Among them, the PLC control port Y2 controls relay K3, the PLC control port Y3 controls relay K5, the PLC control port Y10 controls relay K6, and the PLC control port Y1 controls the control protection relay K2 to be energized. The PLC control port Y2 controls relay K3 to be in the released state, the PLC control port Y3 controls relay K5 to be in the released state, and the PLC control port Y10 controls relay K6 to be in the released state, thus realizing the normal charging test state.

[0074] The reverse connection / charging conversion relay circuit consists of four relays: a PLC, relay K3, battery reverse connection relay K5, current path switching relay K6, and control protection relay K2. Among them, the PLC control port Y2 controls relay K3, the PLC control port Y3 controls relay K5, the PLC control port Y10 controls relay K6, and the PLC control port Y1 controls the control protection relay K2 to be energized. The PLC control port Y2 controls relay K3 to be in the released state, the PLC control port Y3 controls relay K5 to be energized, and the PLC control port Y10 controls relay K6 to be in the released state. If the current is within the safe range, the PLC control port Y10 controls relay K6 to be energized to realize reverse connection small current detection, and at this time the circuit enters the reverse connection test state.

[0075] The emergency stop circuit consists of the PLC control port Y1 controlling the protection relay K2. When an emergency is triggered, Y1 controls relay K2 to be in the released state, disconnecting the test circuit.

[0076] This embodiment provides a detection device for an electric bicycle charger, and the specific working principle is as follows:

[0077] When conducting the test, first connect the charger to be tested. Select the power path according to the charger's connection port, control the relay K2 to close, the relay K3 to be in the released position, the relay K5 to be in the released position, and the relay K6 to be in the released position. The detection device enters the normal charging state to complete the detection of the charging voltage and current. Charge for 30 seconds. If there is no voltage or current during this period, the test instrument will prompt a fault through the liquid crystal screen and the test will terminate. If normal, proceed to the next step and enter the reverse connection test stage. At this time, the relay K5 closes, and the battery enters the reverse connection state. At this time, the current in the battery circuit is tested through a galvanometer (reverse connection current transformer). If it is greater than 5 mA, the detection device will prompt that the reverse connection current test is abnormal and the test will terminate. If the current is normal, after a 15-minute delay, the relay K5 releases, and the battery switches to the normal connection state. At this time, the charging state current and voltage are detected. If there is no voltage or current, the test instrument will prompt a fault through the liquid crystal screen and the test will terminate. If the charging voltage and charging current are normal, proceed to the short-circuit test process. At the start of the short-circuit test, the relay K3 pulls in and the relay K4 pulls in, and the charger output enters the short-circuit state. At this time, the charger current is collected through a DC current transformer. If the current is 0, it means the charger has entered the protection state. If there is abnormal current, the test instrument will prompt a fault through the liquid crystal screen and the test will terminate. If the test is normal, the relay K4 releases and the relay K3 pulls in, and the battery switches to the normal connection state. At this time, if the charging current and voltage are normal after detecting the charging state after the short circuit, the test ends. If the current and voltage are abnormal, it will prompt that the test is abnormal and the test will terminate.

[0078] As Figure 4 shown, the above liquid crystal touch screen is a general industrial control touch liquid crystal screen, and the display screen can display the charger test voltage, charger test current, charger reverse connection test current, test type, and test result.

[0079] During the detection process, if an emergency occurs, such as the charger malfunctioning and smoking, etc., the emergency stop button can be pressed. After the emergency stop button is pressed, the relay K2 releases, then the charger AC input circuit is disconnected, and the charger DC output circuit is disconnected, entering the emergency stop state.

[0080] The above embodiments are only one of the implementation manners that can realize the technical solution of the present invention. The scope of protection required by the present invention is not limited only by this embodiment, but also includes any changes, substitutions, and other implementation manners that are easily conceivable by any person skilled in the art within the technical scope disclosed by the present invention.

Claims

1. A detection device for an electric bicycle charger, characterized in that It includes relay K3, relay K4, relay K5 and relay K6; When in the charging detection state, the output terminal of the charger under test, the first normally closed terminal of the relay K3, the normally closed terminal of the relay K6, the first normally closed terminal of the relay K5, and the battery positive electrode are connected in sequence; a charging current transformer is connected between the first normally closed terminal of the relay K3 and the normally closed terminal of the relay K6; The battery negative electrode, the second normally closed terminal of the relay K3, and the second normally closed terminal of the relay K5 are connected in sequence, and the second normally closed terminal of the relay K5 is grounded; When in the short-circuit detection state, the output terminal of the charger under test, the first normally open terminal of the relay K3, the relay K4, the second normally open terminal of the relay K3, and the battery negative electrode are connected in sequence; When in the reverse connection detection state, the output terminal of the charger under test, the first normally closed terminal of the relay K3, the normally open terminal of the relay K6, and the first normally open terminal of the relay K5 are connected in sequence, and the first normally open terminal of the relay K5 is grounded; The battery negative electrode, the second normally closed terminal of the relay K3, the second normally open terminal of the relay K5, and the battery positive electrode are connected in sequence; a reverse connection current transformer is connected between the first normally closed terminal of the relay K3 and the normally open terminal of the relay K6.

2. The detection device for an electric bicycle charger according to claim 1, characterized in that, A protection relay K2 is connected between the relay K3 and the battery negative electrode.

3. The detection device for an electric bicycle charger according to claim 2, wherein, The model of the protection relay K2 is Relay-SPST relay.

4. The detection device for an electric bicycle charger according to claim 2, wherein The protection relay K2 is controlled through a controller.

5. The detection device for an electric bicycle charger according to claim 1, characterized in that, The relay K3, the relay K4, the relay K5 and the relay K6 are respectively electrically connected to the controller.

6. The detection device for an electric bicycle charger according to claim 5, characterized in that, The model of the controller is PLC industrial control board ZK2N-24.

7. The detection device for an electric bicycle charger according to claim 5, characterized in that, The controller is connected to an industrial control liquid crystal display screen.

8. The detection device for an electric bicycle charger according to claim 1, characterized in that, It further includes a charger input switching circuit, and the charger input switching circuit includes relay K7, relay K8 and relay K9; One end of the normally open feet of the relay K7, the relay K8 and the relay K9 is connected in parallel to the first normally closed terminal of the relay K3; the other ends of the normally open feet of the relay K7, the relay K8 and the relay K9 are respectively connected to the input positive electrodes of three chargers.

9. The detection device for an electric bicycle charger according to claim 8, characterized in that, It further includes a battery input switching circuit, and the battery input switching circuit includes relay K10, relay K11 and relay K12; One end of the normally open feet of the relay K10, the relay K11 and the relay K12 is connected in parallel to the battery output terminal; the other ends of the normally open feet of the relay K10, the relay K11 and the relay K12 are respectively connected to the input positive electrodes corresponding to three batteries.

10. The detection device for an electric bicycle charger according to claim 9, wherein, The relay K7, the relay K8, the relay K9, the relay K10, the relay K11 and the relay K12 are all electrically connected to the controller.

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