New energy automobile charger with dual overheat protection and overheat protection method thereof

Abstract

The invention discloses a new energy automobile charger with dual overheat protection and an overheat protection method thereof, the new energy automobile charger comprises a charging plug, a control box and an automobile body connector which are electrically connected through a wiring pipe, the charging plug comprises a plug body, and a live wire, a zero wire and a grounding wire which are connected to the plug body; the upper portion of the plug body is provided with a temperature detection contact piece used for detecting overheating of a power converter connected with the charging plug, the temperature detection contact piece is connected with a temperature control signal connecting line used for being connected with a control box, and the lower portion of the plug body is provided with a thermistor used for detecting the internal temperature of the charging plug and the temperature from the control box to a vehicle body. The thermistor is connected with a thermistor connecting line used for being connected with the control box, and the live wire, the zero wire and the ground wire are all connected with the vehicle body connector through the control box. The charging plug is non-detachable, so that electric leakage can be prevented; dual overheating protection of the power converter and the plug can be realized, and the charging safety of the new energy automobile is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy vehicles, and in particular relates to a new energy vehicle charger with dual overheat protection and an overheat protection method thereof. Background Art

[0002] In recent years, the technology and industrial chain of new energy vehicles have greatly improved, and more and more consumers are paying attention to and purchasing new energy vehicles. This new type of transportation not only reduces environmental pollution, but also offers advantages such as energy saving, emission reduction, and low carbon emissions, becoming a symbol of environmental protection and innovation.

[0003] With continuous breakthroughs in battery technology and improvements in charging infrastructure, electric vehicles' range has been greatly improved, and charging times have been significantly shortened. However, existing charging plugs for new energy vehicles are not injection-molded, making them non-removable and unable to prevent leakage. They lack a mechanism to detect the power converter's temperature, preventing overheating. They also lack internal temperature detection to prevent overloads, and charging safety remains insufficient. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the deficiencies in the above-mentioned prior art and provide a new energy vehicle charger with dual overheat protection, which cannot be disconnected and can prevent leakage; it helps to achieve dual overheat protection of the power converter and the plug, thereby improving the safety of new energy vehicle charging.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: a new energy vehicle charger with dual overheat protection, including a charging plug, a control box and a vehicle body connector electrically connected through a wiring tube, the charging plug including a plug body, a live wire, a neutral wire and a ground wire connected to the plug body; a temperature detection contact piece is provided on the upper part of the plug body for detecting overheating of the power converter connected to the charging plug, and a temperature control signal connection line for connecting to the control box is connected to the temperature detection contact piece; a thermistor is provided on the lower part of the plug body for detecting the internal temperature of the charging plug and the temperature from the control box to the vehicle body, and the thermistor is connected to a thermistor connection line for connecting to the control box, and the live wire, neutral wire and ground wire are all connected to the vehicle body connector through the control box.

[0006] The above-mentioned new energy vehicle charger with dual overheat protection, the plug body includes an integrally formed bracket and a frame, the bracket is arranged in an inverted T shape, the frame is located at the upper end of the bracket and is arranged around the upper end of the bracket in an inverted U shape, the live wire and the neutral wire are connected to both sides of the lower end of the bracket, the ground wire is connected to the upper end of the bracket, and the temperature detection contact piece is embedded in the upper end of the frame.

[0007] In the above-mentioned new energy vehicle charger with double overheat protection, a thermistor mounting groove is provided at the lower part of the frame, and the thermistor is arranged in the thermistor mounting groove and is located below the temperature control signal connecting line and the grounding line.

[0008] In the above-mentioned new energy vehicle charger with dual overheat protection, the thermistor is connected to the ground wire through the thermistor ground wire.

[0009] The above-mentioned new energy vehicle charger with dual overheat protection, the control box is provided with a controller and a temperature sensor connected to the controller input end, the temperature control signal connection line is connected to the temperature sensor, the input end of the controller is connected to a signal conditioning circuit for amplifying, filtering and A / D conversion conditioning the signal output by the thermistor, the thermistor connection line is connected to the signal conditioning circuit, the output end of the controller is connected to a relay for connecting or disconnecting the charging circuit, and the two normally open contacts of the relay are respectively connected to the live wire and the neutral wire.

[0010] In the above-mentioned new energy vehicle charger with double overheat protection, the bracket is a 16A national standard bracket.

[0011] In the above-mentioned new energy vehicle charger with double overheat protection, the frame is a PP frame.

[0012] In the above-mentioned new energy vehicle charger with double overheat protection, the temperature detection contact piece is made of brass.

[0013] In the above-mentioned new energy vehicle charger with double overheat protection, the charging plug is integrally injection-molded in one step and cannot be disassembled.

[0014] The present invention also discloses an overheating protection method for a new energy vehicle charger with dual overheating protection, comprising the following steps:

[0015] Connect the body connector to the charging port on the new energy vehicle;

[0016] Connect the charging plug to the power converter, and then connect the power converter to the socket to draw power and start charging the new energy vehicle;

[0017] During the charging process of new energy vehicles, the temperature detection contact piece transmits the temperature of the power converter it detects to the temperature sensor through the temperature control signal connection line, and then to the controller. The controller compares the temperature T1 of the power converter output by the temperature sensor with the preset upper temperature limit value T2 and temperature safety value T3 of the power converter. When T1 > T2, the controller controls the relay to disconnect the charging circuit and stop charging the new energy vehicle, avoiding overheating of the power converter caused by external current and voltage surges, and ensuring the normal operation of the power converter. After disconnecting the charging circuit, when the temperature drops to T1 < T3, it indicates that the power converter has returned to a safe temperature, and the controller controls the relay to connect the charging circuit and continue charging the new energy vehicle. At the same time, the thermistor transmits the temperature inside the charging plug it detects to the signal conditioning circuit through the thermistor connection line. The signal conditioning circuit amplifies, filters, and performs A / D conversion on the signal output by the thermistor and then transmits it to the controller. The controller compares the temperature T4 inside the charging plug output by the signal conditioning circuit with the preset upper temperature limit value T5 and temperature safety value T6 inside the charging plug 15. When T4 > T5, the controller controls the relay to disconnect the charging circuit and stop charging the new energy vehicle, avoiding excessive temperature inside the plug or excessive body temperature caused by overload, and ensuring electrical safety. After disconnecting the charging circuit, when the temperature drops to T4 < T6, it indicates that the temperature inside the charging plug has returned to a safe temperature, and the controller controls the relay to connect the charging circuit and continue charging the new energy vehicle.

[0018] The present invention has the following advantages compared with the prior art:

[0019] 1. The charging plug of the present invention is integrally injection-molded at one time, achieving non-detachable wiring, preventing electric leakage, and helping to improve the safety of charging new energy vehicles.

[0020] 2. The skeleton of the charging plug of the present invention adopts a PP skeleton, which is high-temperature resistant and flame-retardant, and is used to fix internal parts, improving the safety of charging new energy vehicles.

[0021] 3. The present invention uses a temperature detection contact piece to detect overheating of the power converter caused by external current and voltage surges, and uses a thermistor to detect the temperature when there is an internal open circuit and poor contact, as well as the temperature from the control box to the vehicle body, achieving double overheat protection.

[0022] 4. The temperature detection contact piece of the present invention is made of brass and is embedded and installed on the upper part of the skeleton, having a large contact area with the power converter, which is convenient and reliable.

[0023] The technical solution of the present invention will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 This is a schematic structural diagram of the charging plug of the present invention;

[0026] Figure 3 It is a circuit connection block diagram of the present invention.

[0027] Description of the accompanying drawings:

[0028] 1—Temperature detection contact piece; 2—Frame; 3—Temperature control signal connection line;

[0029] 4—Ground wire; 5—Thermistor ground wire; 6—Thermistor;

[0030] 7—Thermistor connecting wire; 8—Live wire; 9—Neutral wire;

[0031] 10—bracket; 11—temperature sensor; 12—control box;

[0032] 13—Body connector; 14—Wiring tube; 15—Charging plug. DETAILED DESCRIPTION

[0033] Example 1

[0034] like Figure 1 、 Figure 2 and Figure 3 As shown, the new energy vehicle charger with dual overheat protection in this embodiment includes a charging plug 15, a control box 12 and a vehicle body connector 13 electrically connected through a wiring tube 14. The charging plug 15 includes a plug body, a live wire 8, a neutral wire 9 and a ground wire 4 connected to the plug body; a temperature detection contact piece 1 for detecting overheating of the power converter connected to the charging plug is provided on the upper part of the plug body, and a temperature control signal connection line 3 for connecting to the control box 12 is connected to the temperature detection contact piece 1. The lower part of the plug body is provided with a thermistor 6 for detecting the internal temperature of the charging plug and the temperature from the control box 12 to the vehicle body, and the thermistor 6 is connected to a thermistor connection line 7 for connecting to the control box 12. The live wire 8, neutral wire 9 and ground wire 4 are all connected to the vehicle body connector 13 through the control box 12.

[0035] In a specific implementation, the plug end of the charging plug is connected to a power converter, and the power converter is connected to a socket.

[0036] In this embodiment, the plug body includes an integrally formed bracket 10 and a frame 2. The bracket 10 is arranged in an inverted T shape. The frame 2 is located at the upper end of the bracket 10 and is arranged in an inverted U shape around the upper end of the bracket 10. The live wire 8 and the neutral wire 9 are connected to both sides of the lower end of the bracket 10, the grounding wire 4 is connected to the upper end of the bracket 10, and the temperature detection contact piece 1 is embedded in the upper end of the frame 2.

[0037] In this embodiment, a thermistor mounting groove is provided at the lower portion of the frame 2 , and the thermistor 6 is provided in the thermistor mounting groove and is located below the temperature control signal connection line 3 and the grounding line 4 .

[0038] When the charging plug is overloaded or the internal circuit is broken and the contact is poor, the temperature inside the charging plug or the temperature from the control box 12 to the vehicle body rises. The thermistor 6 detects the temperature in real time and transmits it to the control box 12 through the thermistor connection line 7. The control box 12 disconnects the charging according to the temperature detected by the thermistor 6 to prevent overload and ensure power safety.

[0039] In this embodiment, the thermistor 6 is connected to the grounding wire 4 via the thermistor grounding wire 5 to ensure electrical safety.

[0040] In this embodiment, the control box 12 is provided with a controller 16 and a temperature sensor 11 connected to the input end of the controller 16. The temperature control signal connection line 3 is connected to the temperature sensor 11. The input end of the controller 16 is connected to a signal conditioning circuit 17 for amplifying, filtering and A / D conversion conditioning the signal output by the thermistor 6. The thermistor connection line 7 is connected to the signal conditioning circuit 17. The output end of the controller 16 is connected to a relay 18 for connecting or disconnecting the charging circuit. The two normally open contacts of the relay 18 are respectively connected to the live wire 8 and the neutral wire 9.

[0041] In this embodiment, the bracket 10 is a 16A national standard bracket, which is a standard part.

[0042] In this embodiment, the skeleton 2 is a PP skeleton, which is high temperature resistant and flame retardant, and is used to fix internal parts, thereby improving the safety of charging of new energy vehicles.

[0043] In this embodiment, the temperature detection contact piece 1 is made of brass. It serves as the temperature detection contact point for the power converter. The temperature is transmitted to the temperature sensor 11 via the temperature control signal connection line 3, preventing overheating and ensuring normal operation of the power converter. In practice, overheating of the power converter may be caused by external current or voltage surges. The temperature detection contact piece 1 is made of brass and is embedded in the upper portion of the frame 2, providing a large contact area with the power converter and ensuring convenient and reliable operation.

[0044] In this embodiment, the charging plug is integrally injection-molded once to achieve non-disconnectable wiring, which can prevent electric leakage and contribute to improving the safety of new energy vehicle charging.

[0045] Embodiment 2

[0046] The overheat protection method of the new energy vehicle charger with dual overheat protection in this embodiment includes the following steps:

[0047] Connect the vehicle body connector 13 to the charging hole on the new energy vehicle;

[0048] Connect the charging plug 15 to the power converter. The power converter is connected to the socket to draw power and start charging the new energy vehicle;

[0049] During the charging of the new energy vehicle, the temperature detection contact piece 1 transmits the temperature of the power converter detected by it to the temperature sensor 11 through the temperature control signal connection line 3, and then to the controller 16. The controller 16 compares the temperature T1 of the power converter output by the temperature sensor 11 with the preset upper temperature limit value T2 and temperature safety value T3 of the power converter. When T1>T2, the controller 16 controls the relay 18 to disconnect the charging circuit and stop charging the new energy vehicle to avoid overheating of the power converter caused by external current and voltage surges and ensure the normal operation of the power converter; after disconnecting the charging circuit, when the temperature drops to T1<T3, it means that the power converter has returned to a safe temperature, and the controller 16 controls the relay 18 to connect the charging circuit and continue charging the new energy vehicle; at the same time, the thermistor 6 transmits the internal temperature of the charging plug 15 detected by it to the signal conditioning circuit 17 through the thermistor connection line 7. The signal conditioning circuit 17 amplifies, filters and performs A / D conversion on the signal output by the thermistor 6 and then transmits it to the controller 16. The controller 16 compares the internal temperature T4 of the charging plug 15 output by the signal conditioning circuit 17 with the preset upper temperature limit value T5 and temperature safety value T6 of the internal temperature of the charging plug 15. When T4>T5, the controller 16 controls the relay 18 to disconnect the charging circuit and stop charging the new energy vehicle to avoid excessive internal temperature of the plug or excessive vehicle body temperature caused by overload and ensure electrical safety; after disconnecting the charging circuit, when the temperature drops to T4<T6, it means that the internal temperature of the charging plug 15 has returned to a safe temperature, and the controller 16 controls the relay 18 to connect the charging circuit and continue charging the new energy vehicle.

[0050] The above is only a preferred embodiment of the present invention, and does not impose any limitation on the present invention. Any simple modification, change and equivalent structural change made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A new energy vehicle charger with dual overheat protection, characterized by: The invention comprises a charging plug (15), a control box (12) and a vehicle body connector (13) electrically connected through a wiring tube (14); the charging plug (15) comprises a plug body, a live wire (8), a neutral wire (9) and a ground wire (4) connected to the plug body; a temperature detection contact piece (1) for detecting overheating of a power converter connected to the charging plug is provided on the upper part of the plug body; a temperature control signal connection line (3) for connecting to the control box (12) is connected to the temperature detection contact piece (1); a thermistor (6) for detecting the internal temperature of the charging plug and the temperature between the control box (12) and the vehicle body is provided on the lower part of the plug body; a thermistor connection line (7) for connecting to the control box (12) is connected to the thermistor (6); the live wire (8), the neutral wire (9) and the ground wire (4) are all connected to the vehicle body connector (13) through the control box (12).

2. A new energy vehicle charger with dual overheat protection according to claim 1, characterized in that: The plug body comprises an integrally formed bracket (10) and a frame (2); the bracket (10) is arranged in an inverted T-shape; the frame (2) is located at the upper end of the bracket (10) and is arranged in an inverted U-shape around the upper end of the bracket (10); the live wire (8) and the neutral wire (9) are connected to both sides of the lower end of the bracket (10); the ground wire (4) is connected to the upper end of the bracket (10); and the temperature detection contact piece (1) is embedded and installed at the upper end of the frame (2).

3. A new energy vehicle charger with dual overheat protection according to claim 2, characterized in that: A thermistor mounting groove is provided at the lower portion of the skeleton (2), and the thermistor (6) is arranged in the thermistor mounting groove and is located below the temperature control signal connecting line (3) and the grounding line (4).

4. A new energy vehicle charger with dual overheat protection according to claim 3, characterized in that: The thermistor (6) is connected to the grounding wire (4) via the thermistor grounding wire (5).

5. A new energy vehicle charger with dual overheat protection according to claim 1, characterized in that: The control box (12) is provided with a controller (16) and a temperature sensor (11) connected to the input end of the controller (16); the temperature control signal connecting line (3) is connected to the temperature sensor (11); the input end of the controller (16) is connected to a signal conditioning circuit (17) for amplifying, filtering, and A / D conversion conditioning of a signal output by the thermistor (6); the thermistor connecting line (7) is connected to the signal conditioning circuit (17); the output end of the controller (16) is connected to a relay (18) for connecting or disconnecting a charging circuit; the two normally open contacts of the relay (18) are respectively connected to a live wire (8) and a neutral wire (9).

6. A new energy vehicle charger with dual overheat protection according to any one of claims 2 to 5, characterized in that: The bracket (10) is a 16A national standard bracket.

7. A new energy vehicle charger with dual overheat protection according to any one of claims 2 to 5, characterized in that: The skeleton (2) is a PP skeleton.

8. A new energy vehicle charger with dual overheat protection according to any one of claims 2 to 5, characterized in that: The temperature detection contact piece (1) is made of brass.

9. A new energy vehicle charger with dual overheat protection according to any one of claims 2 to 5, characterized in that: The charging plug is integrally injection-molded in one step and cannot be disconnected.

10. An overheat protection method for a new energy vehicle charger with dual overheat protection as claimed in claim 5, characterized in that: The method comprises the following steps: Connect the vehicle body connector (13) to the charging port on the new energy vehicle; Connect the charging plug (15) to the power converter, which is connected to the socket to draw power and start charging the new energy vehicle; During the charging process of a new energy vehicle, the temperature detection contact piece (1) transmits the temperature of the power converter it detects to the temperature sensor (11) through the temperature control signal connection line (3), and then to the controller (16). The controller (16) compares the temperature T1 of the power converter output by the temperature sensor (11) with the preset upper temperature limit value T2 and temperature safety value T3 of the power converter. When T1 > T2, the controller (16) controls the relay (18) to disconnect the charging circuit and stop charging the new energy vehicle, avoiding overheating of the power converter caused by external current and voltage surges and ensuring the normal operation of the power converter. After the charging circuit is disconnected and the temperature drops to T1 < T3, it means that the power converter has returned to a safe temperature, and the controller (16) controls the relay (18) to connect the charging circuit and continue charging the new energy vehicle. At the same time, the thermistor (6) transmits the internal temperature of the charging plug (15) it detects to the signal conditioning circuit (17) through the thermistor connection line (7). The signal conditioning circuit (17) amplifies, filters, and performs A / D conversion on the signal output by the thermistor (6) and then transmits it to the controller (16). The controller (16) compares the internal temperature T4 of the charging plug (15) output by the signal conditioning circuit (17) with the preset upper temperature limit value T5 and temperature safety value T6 of the internal temperature of the charging plug 15. When T4 > T5, the controller (16) controls the relay (18) to disconnect the charging circuit and stop charging the new energy vehicle, avoiding excessive internal temperature of the plug or excessive body temperature caused by overload and ensuring electrical safety. After the charging circuit is disconnected and the temperature drops to T4 < T6, it means that the internal temperature of the charging plug (15) has returned to a safe temperature, and the controller (16) controls the relay (18) to connect the charging circuit and continue charging the new energy vehicle.

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