Power-off circuit of electric vehicle charger and electric vehicle

Abstract

The utility model provides a power-off circuit of an electric vehicle charger and an electric vehicle. The power-off circuit comprises a normally-open relay, a point contact switch, a relay driving circuit, a first voltage output circuit, a single-chip microcomputer and a display screen. When the normally open relay is disconnected, the charger is completely powered off; when the point contact switch is pressed for the first time, the single-chip microcomputer outputs a high level, and the first voltage output circuit outputs a first voltage to the relay driving circuit. The relay driving circuit drives the normally open relay to start, so that the main contact of the normally open relay is closed; when the point contact switch is loosened, the normally open relay is kept in a closed state, and the charger works normally; after the point contact switch is pressed again, the single chip microcomputer controls the display screen to display the charging duration and the reservation duration; when timing time is up or charging is completed, the single-chip microcomputer outputs low level, the relay driving circuit stops outputting, the main contact of the normally open relay is disconnected, and the charger is completely powered off. After the circuit reaches the timing time or charging is completed, the charger is completely powered off, and safety is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicle control, in particular to a power-off circuit of an electric vehicle charger and an electric vehicle. Background Art

[0002] In recent years, due to the frequent occurrence of electric vehicle fires, consumers have paid more attention to the safe use of electric vehicles.

[0003] The highest proportion of electric vehicle fires is spontaneous combustion during charging. The existing chargers in the industry will automatically stop outputting after being fully charged, but the single-ended flyback circuit, single-chip microcomputer, etc. are still working normally. Spontaneous combustion caused by failure of the charger protection circuit and overcharging also accounts for a considerable proportion, which in turn poses a safety hazard. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a power-off circuit for an electric vehicle charger and an electric vehicle. When the circuit reaches a timing time or charging is completed, the charger will be completely powered off, thereby ensuring safety and improving user experience.

[0005] In a first aspect, an embodiment of the utility model provides a power-off circuit for an electric vehicle charger, the circuit comprising: a normally open relay, a touch switch, a relay drive circuit, a first voltage output circuit, a single chip microcomputer and a display screen;

[0006] When the normally open relay is disconnected, the charger is completely powered off;

[0007] The first voltage output circuit, the relay drive circuit, the normally open relay, the touch switch and the single chip microcomputer are connected in sequence, and the relay drive circuit and the display screen are connected to the single chip microcomputer respectively;

[0008] When the touch switch is pressed for the first time, the single chip microcomputer outputs a high level, and the first voltage output circuit outputs a first voltage to the relay drive circuit; the relay drive circuit drives the normally open relay to start, so that the main contact of the normally open relay is closed; when the touch switch is released, the normally open relay maintains a closed state, and the charger works normally;

[0009] When the touch switch is pressed again, the single chip microcomputer controls the display screen to display the charging time and the reservation time;

[0010] When the timing time is reached or charging is completed, the single chip microcomputer outputs a low level, the relay drive circuit stops outputting, the main contact of the normally open relay is disconnected, and the charger is completely powered off.

[0011] Furthermore, the positive electrode of the normally open relay is connected to the output end of the relay drive circuit, and the negative electrode of the normally open relay is connected to the ground wire.

[0012] Furthermore, the touch switch includes a first group of switches and a second group of switches, the first group of switches is connected to the main contacts of the normally open relay, and the second group of switches is connected to the ground wire and the single chip microcomputer.

[0013] Further, the circuit also includes a second voltage output circuit;

[0014] The second voltage output circuit is used to output a second voltage and output the second voltage to the single chip microcomputer.

[0015] Furthermore, the circuit also includes a rectifier bridge;

[0016] The rectifier bridge is used to rectify the household industrial frequency alternating current received by the charger into the first direct current.

[0017] Furthermore, the circuit also includes a single-ended flyback circuit;

[0018] The single-ended flyback circuit is used to convert the first direct current into alternating current.

[0019] Furthermore, the circuit also includes a transformer and a rectifier circuit;

[0020] The transformer is used to transform the AC power, and the primary secondary terminal is rectified into a second DC power through the rectifier circuit to charge the battery; the secondary secondary terminal is rectified into a first voltage and a second voltage.

[0021] Furthermore, the first voltage is 12V, and the second voltage is 5V.

[0022] Furthermore, the display screen is arranged on the shell of the charger.

[0023] In a second aspect, an embodiment of the utility model provides an electric vehicle, including the power-off circuit of the electric vehicle charger as described above.

[0024] The embodiment of the utility model provides a power-off circuit of an electric vehicle charger and an electric vehicle, comprising: a normally open relay, a touch switch, a relay driving circuit, a first voltage output circuit, a single chip microcomputer and a display screen; the first voltage output circuit, the relay driving circuit, the normally open relay, the touch switch and the single chip microcomputer are connected in sequence, and the relay driving circuit and the display screen are respectively connected to the single chip microcomputer; when the normally open relay is disconnected, the charger is completely powered off; when the touch switch is pressed for the first time, the single chip microcomputer outputs a high level, and the first voltage output circuit outputs a first voltage to the relay driving circuit; the relay driving circuit drives the normally open relay to start, so that the main contact of the normally open relay is closed; when the touch switch is released, the normally open relay maintains a closed state, and the charger works normally; when the touch switch is pressed again, the single chip microcomputer controls the display screen to display the charging time and the reservation time; when the timing time is reached or the charging is completed, the single chip microcomputer outputs a low level, the relay driving circuit stops outputting, the main contact of the normally open relay is disconnected, and the charger is completely powered off; when the timing time is reached or the charging is completed, the charger will be completely powered off, thereby ensuring safety and improving user experience.

[0025] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model are realized and obtained by the structures specifically pointed out in the description, claims and drawings.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of a power-off circuit of an electric vehicle charger provided in Embodiment 1 of the utility model;

[0029] Figure 2 A schematic diagram of the power-off circuit structure of an electric vehicle charger provided in Embodiment 1 of the utility model;

[0030] Figure 3 This is a schematic diagram of the structure of a relay drive circuit provided in Example 1 of the utility model.

[0031] icon:

[0032] 1-Normally open relay; 2-Tact switch; 3-Relay drive circuit; 4-First voltage output circuit; 5-Single chip microcomputer; 6-Display screen; 7-Second voltage output circuit; 8-Rectifier bridge; 9-Single-ended flyback circuit; 10-Transformer; 11-Rectifier circuit. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] To facilitate understanding of this embodiment, the embodiment of the utility model is described in detail below.

[0035] Embodiment 1:

[0036] Figure 1 This is a schematic diagram of a power-off circuit of an electric vehicle charger provided in Embodiment 1 of the utility model.

[0037] Reference Figure 1 , the circuit includes: a normally open relay 1, a touch switch 2, a relay drive circuit 3, a first voltage output circuit 4, a single chip computer 5 and a display screen 6;

[0038] The first voltage output circuit 4, the relay drive circuit 3, the normally open relay 1, the touch switch 2 and the single-chip microcomputer 5 are connected in sequence, and the relay drive circuit 3 and the display screen 6 are respectively connected to the single-chip microcomputer 5; wherein, referring to Figure 3 The schematic diagram of the relay driving circuit structure is shown in FIG. A normally open relay 1 is added between the charger input terminal and the rectifier bridge;

[0039] When the charger input plug is connected to industrial frequency AC power, the charger is completely powered off because the contacts of the normally open relay 1 are disconnected;

[0040] When the touch switch 2 is pressed for the first time, the single chip computer 5 outputs a high level, and the first voltage output circuit 4 outputs a first voltage to the relay drive circuit 3; the relay drive circuit 3 drives the normally open relay 1 to start, so that the main contact of the normally open relay 1 is closed; when the touch switch 2 is released, the normally open relay 1 maintains a closed state, and the charger works normally;

[0041] Here, when the touch switch 2 is pressed for the first time, the rectifier bridge, the single-ended flyback circuit, the transformer, the rectifier circuit, etc. are started, the single-chip microcomputer 5 works normally, and the CON terminal of the single-chip microcomputer 5 outputs a high level.

[0042] When the touch switch 2 is pressed again, the single chip microcomputer 5 controls the display screen 6 to display the charging time and the reservation time;

[0043] Specifically, after the charger is started, the user can short-press the touch switch 2 again or long-press the touch switch 2 to determine the charging time and the scheduled time, and display them on the display screen 6. For example, the interface after the charger is started is the charging time interface. Short-pressing the touch switch 2 changes the time. Long-pressing the touch switch 2 will enter the next interface of the scheduled time interface. Short-pressing the touch switch 2 adjusts the scheduled charging time. For example, if 8 and 2 are input respectively, the charger will delay charging for 2 hours, and the output will be turned off after charging for 8 hours. If the user does not press the touch switch, the charger will charge immediately with the factory default charging time.

[0044] When the timing time is reached or charging is completed, the single chip microcomputer (CON terminal) 5 outputs a low level, the relay drive circuit 3 stops outputting, the main contact of the normally open relay 1 is disconnected, and the charger is completely powered off.

[0045] In this embodiment, the charger can be physically completely powered off; the charger can use a touch switch to achieve charging reset (needs to be pressed once when powered on) and display operation on the display screen.

[0046] Further, see Figure 2 The positive electrode of the normally open relay 1 is connected to the output end of the relay driving circuit 3, and the negative electrode of the normally open relay 1 is connected to the ground wire. Among them, the positive electrode of the control end of the normally open relay 1 is controlled by the single chip microcomputer 5 to disconnect with the 12V positive electrode.

[0047] Furthermore, the touch switch 2 includes a first set of switches and a second set of switches, the first set of switches is connected to the main contact of the normally open relay, and the second set of switches is connected to the ground wire and the single chip microcomputer. Among them, pins 1 and pins 2 constitute the first set of switches, and pins 3 and pins 4 constitute the second set of switches. When the touch switch is pressed, the single chip microcomputer 5 can identify the pressing state.

[0048] Furthermore, the circuit also includes a second voltage output circuit 7;

[0049] The second voltage output circuit 7 is used to output a second voltage, and output the second voltage to the single chip computer 5 .

[0050] Furthermore, the circuit also includes a rectifier bridge 8;

[0051] The rectifier bridge 8 is used to rectify the household industrial frequency alternating current received by the charger into the first direct current.

[0052] Furthermore, the circuit also includes a single-ended flyback circuit 9;

[0053] The single-ended flyback circuit 9 is used to convert the first direct current into alternating current.

[0054] Furthermore, the circuit also includes a transformer 10 and a rectifier circuit 11;

[0055] The transformer 10 is used to transform the AC power. The primary secondary terminal is rectified into a second DC power through the rectifier circuit 11 and charges the battery. The secondary secondary terminal is rectified into a first voltage and a second voltage.

[0056] Furthermore, the first voltage is 12V and the second voltage is 5V.

[0057] Furthermore, the display screen 6 is arranged on the housing of the charger and can also display the timing time.

[0058] An embodiment of the utility model provides an electric vehicle, comprising the power-off circuit of the electric vehicle charger as described above.

[0059] The embodiment of the utility model provides a power-off circuit of an electric vehicle charger and an electric vehicle, comprising: a normally open relay, a touch switch, a relay driving circuit, a first voltage output circuit, a single chip microcomputer and a display screen; the first voltage output circuit, the relay driving circuit, the normally open relay, the touch switch and the single chip microcomputer are connected in sequence, and the relay driving circuit and the display screen are respectively connected to the single chip microcomputer; when the normally open relay is disconnected, the charger is completely powered off; when the touch switch is pressed for the first time, the single chip microcomputer outputs a high level, and the first voltage output circuit outputs a first voltage to the relay driving circuit; the relay driving circuit drives the normally open relay to start, so that the main contact of the normally open relay is closed; when the touch switch is released, the normally open relay maintains a closed state, and the charger works normally; when the touch switch is pressed again, the single chip microcomputer controls the display screen to display the charging time and the reservation time; when the timing time is reached or the charging is completed, the single chip microcomputer outputs a low level, the relay driving circuit stops outputting, the main contact of the normally open relay is disconnected, and the charger is completely powered off; when the timing time is reached or the charging is completed, the charger will be completely powered off, thereby ensuring safety and improving user experience.

[0060] The computer program product provided in the embodiment of the utility model includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the method described in the previous method embodiment. The specific implementation can be found in the method embodiment, which will not be repeated here.

[0061] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0062] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the utility model can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the utility model. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0064] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0065] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above-mentioned embodiments, ordinary technicians in this field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above-mentioned embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A power-off circuit for an electric vehicle charger, characterized in that: The circuit comprises: a normally open relay, a touch switch, a relay drive circuit, a first voltage output circuit, a single chip microcomputer and a display screen; The first voltage output circuit, the relay drive circuit, the normally open relay, the touch switch and the single chip microcomputer are connected in sequence, and the relay drive circuit and the display screen are connected to the single chip microcomputer respectively; When the normally open relay is disconnected, the charger is completely powered off; When the touch switch is pressed for the first time, the single chip microcomputer outputs a high level, and the first voltage output circuit outputs a first voltage to the relay drive circuit; the relay drive circuit drives the normally open relay to start, so that the main contact of the normally open relay is closed; when the touch switch is released, the normally open relay maintains a closed state, and the charger works normally; When the touch switch is pressed again, the single chip microcomputer controls the display screen to display the charging time and the reservation time; When the timing time is reached or charging is completed, the single chip microcomputer outputs a low level, the relay drive circuit stops outputting, the main contact of the normally open relay is disconnected, and the charger is completely powered off.

2. The power-off circuit of the electric vehicle charger according to claim 1, characterized in that: The positive electrode of the normally open relay is connected to the output end of the relay drive circuit, and the negative electrode of the normally open relay is connected to the ground wire.

3. The power-off circuit of the electric vehicle charger according to claim 1, characterized in that: The touch switch includes a first group of switches and a second group of switches, the first group of switches is connected to the main contacts of the normally open relay, and the second group of switches is connected to the ground wire and the single chip microcomputer.

4. The power-off circuit of the electric vehicle charger according to claim 1, characterized in that: The circuit also includes a second voltage output circuit; The second voltage output circuit is used to output a second voltage and output the second voltage to the single chip microcomputer.

5. The power-off circuit of the electric vehicle charger according to claim 1, characterized in that: The circuit also includes a rectifier bridge; The rectifier bridge is used to rectify the household industrial frequency alternating current received by the charger into the first direct current.

6. The power-off circuit of the electric vehicle charger according to claim 5, characterized in that: The circuit also includes a single-ended flyback circuit; The single-ended flyback circuit is used to convert the first direct current into alternating current.

7. The power-off circuit of the electric vehicle charger according to claim 6, characterized in that: The circuit also includes a transformer and a rectifier circuit; The transformer is used to transform the AC power, and the primary secondary terminal is rectified into a second DC power through the rectifier circuit to charge the battery; the secondary secondary terminal is rectified into a first voltage and a second voltage.

8. The power-off circuit of the electric vehicle charger according to claim 7, characterized in that: The first voltage is 12V, and the second voltage is 5V.

9. The power-off circuit of the electric vehicle charger according to claim 1, characterized in that: The display screen is arranged on the shell of the charger.

10. An electric vehicle, characterized in that: A power-off circuit for an electric vehicle charger comprising any one of claims 1 to 9.

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