High-voltage pre-charging box protection circuit for vehicle-mounted air conditioner

Abstract

The utility model discloses a high-voltage pre-charging box protection circuit for a vehicle-mounted air conditioner, which comprises a pre-charging box and a protection circuit arranged in the pre-charging box, and the protection circuit comprises a direct-current contactor I, a pre-charging resistor R, a direct-current contactor II, a capacitor II, a capacitor I, a high-voltage fuse II and a high-voltage fuse I, one end of the pre-charging resistor R is connected with an A2-port of the first direct-current contactor and one end of the first high-voltage fuse, the other end of the pre-charging resistor R is connected with an A2-port of the second direct-current contactor and one end of the second high-voltage fuse, a temperature protection switch is arranged on the surface of the pre-charging resistor R, and one end of the temperature protection switch is connected with the negative electrode of the controller. One end of the capacitor I is connected with one end of the high-voltage fuse II and one end of the capacitor II; a temperature protection switch is additionally arranged on the upper surface of the pre-charging resistor, and a direct-current contactor with a contact working state feedback function is adopted and used for protecting the working temperature of the pre-charging resistor not to exceed a safety value.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning pre-charging protection circuits, in particular to a high-voltage pre-charging box protection circuit for a vehicle-mounted air-conditioner. Background Art

[0002] At present, in actual application of high-voltage pre-charging boxes for vehicle air conditioners, the pre-charging resistor has no temperature protection and the DC contactor has no contact action status judgment. This can easily cause the pre-charging resistor to overheat and fail to protect when the pre-charging resistor fails or the DC contactor contacts fail to close or release as required, causing internal fire and damage to the high-voltage pre-charging box. This can damage the air-conditioning system and the vehicle, causing personal and property losses. Chinese patent application No. 201720909474.7 discloses a high-voltage integrated power supply, including a high-voltage distribution box and an overcurrent protection circuit arranged inside the high-voltage distribution box. The two terminals of the pre-charging resistor are connected to the contacts of the DC contactor. The pre-charging resistor has no temperature protection and lacks the above-mentioned defects. Therefore, a protection circuit for a high-voltage pre-charging box for a vehicle air conditioner is proposed to solve the above problems. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the existing defects and provide a high-voltage pre-charging box protection circuit for a vehicle air conditioner, add a temperature protection switch on the upper surface of the pre-charging resistor, and adopt a DC contactor with contact working status feedback to protect the working temperature of the pre-charging resistor from exceeding a safe value. When the pre-charging resistor in the high-voltage pre-charging box overheats, the entire air-conditioning system stops working, thereby preventing serious accidents, and can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-voltage pre-charging box protection circuit for a vehicle air conditioner, comprising a pre-charging box and a protection circuit arranged in the pre-charging box, the protection circuit comprising a DC contactor 1, a pre-charging resistor R, a DC contactor 2, a capacitor 2, a capacitor 1, a high-voltage fuse 2 and a high-voltage fuse 1, one end of the pre-charging resistor R is respectively connected to the A2-port of the DC contactor 1 and one end of the high-voltage fuse 1, the other end of the pre-charging resistor R is respectively connected to the A2-port of the DC contactor 2 and one end of the high-voltage fuse 2, a temperature protection switch is arranged on the surface of the pre-charging resistor R, one end of the temperature protection switch is connected to the negative pole of the controller, and the other end is connected to the pre-charging resistor temperature protection switch, one end of the capacitor 1 is connected to one end of the high-voltage fuse 2 and one end of the capacitor 2, the other end of the capacitor 1 is connected to the high-voltage negative pole of the whole vehicle, one end of the capacitor 2 is connected to one end of the high-voltage fuse 2 and one end of the capacitor 1, and the other end of the capacitor 2 is connected to the high-voltage negative pole of the whole vehicle.

[0005] Furthermore, the A1+ port of DC contactor one is connected to the positive pole of the high-voltage input of the whole vehicle and the A1+ port of DC contactor two respectively, the A2- port of DC contactor one is connected to the high-voltage fuse one and one end of the pre-charging resistor R respectively, the c1 port of DC contactor one is connected to the negative pole of the controller, and the c2 port of DC contactor one is connected to the contact status judgment of the main DC contactor.

[0006] Furthermore, the A1+ port of DC contactor 2 is respectively connected to the positive pole of the high-voltage input of the whole vehicle and the A1+ port of DC contactor 1, the A2- port of DC contactor 2 is respectively connected to the high-voltage fuse 2 and one end of the pre-charging resistor R, the C1 port of DC contactor 2 is connected to the negative pole of the controller, and the C2 port of DC contactor 2 is connected to the contact status judgment of the compressor DC contactor.

[0007] Furthermore, one end of the high-voltage fuse is respectively connected to the A2-port of the DC contactor and one end of the pre-charging resistor R, and the other end of the high-voltage fuse is respectively connected to the liquid PTC high-voltage positive electrode and the DC-DC power supply high-voltage positive electrode.

[0008] Furthermore, one end of the high-voltage fuse 2 is respectively connected to the A2-port of the DC contactor 2 and one end of the pre-charging resistor R, and the other end of the high-voltage fuse 2 is respectively connected to the first end of the capacitor 1, the first end of the capacitor 2, and the high-voltage positive electrode of the compressor.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] The circuit structure is simple in design and the scope of modification is small. On the basis of the traditional circuit, a temperature protection switch is added to the upper surface of the pre-charging resistor, and a DC contactor with a contact working status feedback function is used to protect the working temperature of the pre-charging resistor from exceeding a safe value. When the pre-charging resistor in the high-voltage pre-charging box overheats, the entire air-conditioning system stops working; thereby effectively solving the problem that the pre-charging resistor cannot be protected when it overheats, causing internal fire and damage to the high-voltage pre-charging box. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the circuit principle structure of the utility model;

[0012] Figure 2 This is a schematic diagram of the structure of the pre-filled box of the utility model.

[0013] In the figure: 1 DC contactor 1, 2 pre-charging resistor R, 3 DC contactor 2, 4 capacitor 2, 5 capacitor 1, 6 high-voltage fuse 2, 7 temperature protection switch, 8 high-voltage fuse 1, 9 pre-charging box. DETAILED DESCRIPTION

[0014] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply 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 understood as a limitation on the present invention.

[0015] See also Figure 1-2 The utility model provides a technical solution: a high-voltage pre-charging box protection circuit for a vehicle air conditioner, comprising a pre-charging box 9 and a protection circuit arranged in the pre-charging box 9, the protection circuit comprising a DC contactor 1, a pre-charging resistor R2, a DC contactor 23, a capacitor 24, a capacitor 15, a high-voltage fuse 26 and a high-voltage fuse 18, one end of the pre-charging resistor R2 is respectively connected to the A2-port of the DC contactor 1 and one end of the high-voltage fuse 18, the other end of the pre-charging resistor R2 is respectively connected to the A2-port of the DC contactor 23 and one end of the high-voltage fuse 26, a temperature protection switch 7 is arranged on the surface of the pre-charging resistor R2, the temperature protection switch 7 is connected to the pre-charging resistor R2 through a thermally conductive adhesive, one end of the temperature protection switch 7 is connected to the negative electrode of the controller, and the other end is connected to the pre-charging resistor temperature protection switch, wherein the temperature protection switch 7 protects the pre-charging resistor R2, when the temperature of the pre-charging resistor R2 exceeds 100°C, the temperature The protection switch 7 is disconnected, and the air-conditioning controller determines that the pre-charging resistor R2 is overheated, and will cut off the high-voltage power supply of the high-voltage pre-charging box 9 to ensure that its operating temperature does not exceed 100°C, thereby protecting itself and nearby devices. The DC contactor and the compressor DC contactor's c1, c2 contact state feedback switch feedbacks the real-time working state of the DC contactor contacts, which is used by the air-conditioning controller to determine whether the working state of the DC contactor meets the requirements of the control logic, to prevent the air-conditioning controller from starting the compressor when the compressor DC contactor is not normally attracted, causing the pre-charging resistor to continue working in the pre-charging state, and the risk of fire and damage caused by overheating of the pre-charging resistor. One end of the capacitor 5 is connected to one end of the high-voltage fuse 26 and one end of the capacitor 24, and the other end of the capacitor 5 is connected to the high-voltage negative pole of the whole vehicle. One end of the capacitor 24 is connected to one end of the high-voltage fuse 26 and one end of the capacitor 15, and the other end of the capacitor 24 is connected to the high-voltage negative pole of the whole vehicle.

[0016] The A1+ port of DC contactor 1 is connected to the positive pole of the high-voltage input of the whole vehicle and the A1+ port of DC contactor 23 respectively, the A2- port of DC contactor 1 is connected to the high-voltage fuse 8 and one end of the pre-charging resistor R2 respectively, the C1 port of DC contactor 1 is connected to the negative pole of the controller, and the C2 port of DC contactor 1 is connected to the contact status judgment of the main DC contactor.

[0017] The A1+ port of DC contactor 23 is connected to the positive pole of the high-voltage input of the whole vehicle and the A1+ port of DC contactor 1 respectively, the A2- port of DC contactor 23 is connected to the high-voltage fuse 26 and one end of the pre-charging resistor R2 respectively, the C1 port of DC contactor 23 is connected to the negative pole of the controller, and the C2 port of DC contactor 23 is connected to the contact status judgment of the compressor DC contactor.

[0018] One end of the high-voltage fuse 8 is respectively connected to the A2-port of the DC contactor 1 and one end of the pre-charging resistor R2, and the other end of the high-voltage fuse 8 is respectively connected to the liquid PTC high-voltage positive electrode and the DC-DC power supply high-voltage positive electrode; respectively connected to the A2-port of the DC contactor 23 and one end of the pre-charging resistor R2, and the other end of the high-voltage fuse 26 is respectively connected to one end of the capacitor 15, one end of the capacitor 24, and the compressor high-voltage positive electrode.

[0019] The protection circuit installs a temperature protection switch 7 on the surface of the pre-charging resistor R2. The temperature protection switch 7 uses R25A-10003-105H, and its temperature protection value is disconnection at 100°C and recovery at 80°C. The DC contactor and the compressor DC contactor use LEV100-24HD, which has a contact state feedback function.

[0020] The basic principles, main features and advantages of the present invention are shown and described above. Without departing from the spirit and scope of the present invention, the present invention may also be subject to various changes and improvements, which are all within the scope of the present invention to be protected.

Claims

1. A high-voltage pre-filling box protection circuit for a vehicle air conditioner, comprising a pre-filling box (9) and a protection circuit arranged in the pre-filling box (9), characterized in that: The protection circuit comprises a DC contactor 1 (1), a pre-charging resistor R (2), a DC contactor 2 (3), a capacitor 2 (4), a capacitor 1 (5), a high-voltage fuse 2 (6) and a high-voltage fuse 1 (8). One end of the pre-charging resistor R (2) is connected to the A2-port of the DC contactor 1 (1) and one end of the high-voltage fuse 1 (8) respectively, and the other end of the pre-charging resistor R (2) is connected to the A2-port of the DC contactor 2 (3) and one end of the high-voltage fuse 2 (6) respectively. A temperature protection switch (7) is arranged on the surface of the pre-charging resistor R (2). One end of the temperature protection switch (7) is connected to the negative pole of the controller, and the other end is connected to the pre-charging resistor temperature protection switch. One end of the capacitor 1 (5) is connected to one end of the high-voltage fuse 2 (6) and one end of the capacitor 2 (4). The other end of the capacitor 1 (5) is connected to the high-voltage negative pole of the whole vehicle. One end of the capacitor 2 (4) is connected to one end of the high-voltage fuse 2 (6) and one end of the capacitor 1 (5). The other end of the capacitor 2 (4) is connected to the high-voltage negative pole of the whole vehicle.

2. A high voltage pre-filling box protection circuit for a vehicle air conditioner according to claim 1, characterized in that: The A1+ port of the DC contactor 1 (1) is connected to the positive pole of the high voltage input of the vehicle and the A1+ port of the DC contactor 2 (3), respectively; the A2- port of the DC contactor 1 (1) is connected to the high voltage fuse 1 (8) and one end of the pre-charging resistor R (2), respectively; the C1 port of the DC contactor 1 (1) is connected to the negative pole of the controller; and the C2 port of the DC contactor 1 (1) is connected to the contact state judgment of the main DC contactor.

3. A high voltage pre-filling box protection circuit for a vehicle air conditioner according to claim 1, characterized in that: The A1+ port of the DC contactor 2 (3) is connected to the positive pole of the high voltage input of the vehicle and the A1+ port of the DC contactor 1 (1), respectively; the A2- port of the DC contactor 2 (3) is connected to the high voltage fuse 2 (6) and one end of the pre-charge resistor R (2), respectively; the C1 port of the DC contactor 2 (3) is connected to the negative pole of the controller; and the C2 port of the DC contactor 2 (3) is connected to the contact state judgment of the compressor DC contactor.

4. A high voltage pre-charge box protection circuit for a vehicle air conditioner according to claim 1, characterized in that: One end of the high-voltage fuse 1 (8) is connected to the A2-port of the DC contactor 1 (1) and one end of the pre-charging resistor R (2), respectively, and the other end of the high-voltage fuse 1 (8) is connected to the liquid PTC high-voltage positive electrode and the DC-DC power supply high-voltage positive electrode, respectively.

5. The high-voltage pre-charge box protection circuit for a vehicle air conditioner according to claim 1 is characterized in that: One end of the high-voltage fuse 2 (6) is respectively connected to the A2-port of the DC contactor 2 (3) and one end of the pre-charging resistor R (2), and the other end of the high-voltage fuse 2 (6) is respectively connected to one end of the capacitor 1 (5), one end of the capacitor 2 (4), and the high-voltage positive electrode of the compressor.

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