A power distribution device for a vehicle air conditioning system

Abstract

The utility model discloses a kind of vehicle-mounted air conditioning system distribution device, including power supply, main circuit power cable, controller power cable, 1# electric connector, 2# electric connector, several load power cables, controller;Power supply is powered to multiple negative by main circuit power cable, 1# electric connector, several load power cables, power supply is also powered to controller by controller power cable, 2# electric connector.The utility model is provided with double electric connector, double power cable, realizes controller and main circuit power supply independent in function, in addition to satisfying current carrying capacity, reasonably increase the cross-sectional area of wire, in the case where space volume is allowed, the pressure drop on line is maximized.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning power distribution devices, specifically a power distribution device for a vehicle air conditioning system. Background Technology

[0002] Currently, the power supply system for military vehicle air conditioners, except for some high-voltage DC (DC600), is mostly low-voltage DC (DC24V). Meanwhile, traditional power distribution methods generally use a single-circuit, single-cable configuration. However, some air conditioners, due to factors such as power consumption matching with the current capacity and size of individual connectors, adopt a multi-circuit power distribution method. This type of multi-circuit power distribution method mostly involves multiple circuits sharing the power supply, with connectors and cables having consistent capacities.

[0003] The aforementioned power distribution method represents the majority of traditional power distribution methods. While this method currently shows no drawbacks for high-voltage DC-powered vehicle air conditioning systems, it becomes increasingly problematic for low-voltage DC-powered systems. With the increasing variety and size of vehicles, and the lengthening of power distribution paths, the drawbacks of single-circuit, single-cable power supply are becoming apparent. Compared to high-voltage DC air conditioning systems, the current carried in the power cable during the same cooling capacity operation in a low-voltage DC system is hundreds of times greater. At this point, the voltage drop caused by the cable's resistance becomes significant. In a single-circuit, single-cable system operating over long distances, the voltage drop caused by the large current (from motor startup and normal operation) within the cable can interfere with the controller's signal acquisition and power status monitoring, leading to false alarms and affecting the normal operation of the air conditioning system. Utility Model Content

[0004] To address the problems existing in the current power distribution methods, this invention provides a vehicle air conditioning power distribution device to solve the problem of false alarms caused by signal interference in the controllers of the existing technology.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A vehicle air conditioning system power distribution device includes a power supply (1), a main circuit power supply cable (2-1), a controller power supply cable (2-2), a #1 electrical connector (3-1), a #2 electrical connector (3-2), several load power supply cables, and an air conditioning controller (9). The power supply (1) is connected to the input end of the #1 electrical connector (3-1) through the main circuit power supply cable (2-1), and the output end of the #1 electrical connector (3-1) is connected to the power supply ends of several loads through several load power supply cables. The power supply (1) is also connected to the input end of the #2 electrical connector (3-2) through the controller power supply cable (2-2), and the output end of the #2 electrical connector (3-2) is connected to the power supply end of the controller (9) through an output cable.

[0006] Furthermore, each load power supply cable is connected to the contact switch of the electromagnetic relay (5), and the voltage output terminal of the controller (9) is connected to the coil of the electromagnetic relay (5) through the controller signal cable A (7-1).

[0007] Furthermore, the signal input terminal of the controller (9) is also connected to the protection switch (8) and temperature sensor in the air conditioner via the controller signal cable.

[0008] In this invention, a dual-connector ensures strict isolation in the power supply circuit, with one circuit supplying power to the main circuit and the other to the control circuit. The wire diameter of the dual-power cable used in this invention meets both the current capacity requirements and the allowable voltage drop requirements for long-distance power supply. The power supply terminals of the dual-connector are drawn from the same power source, and the power status monitored by the controller is consistent with the power supply status of the air conditioning system.

[0009] This invention features dual electrical connectors and dual power supply cables. One connector draws power from the user's power source via the main circuit power supply cable, and its output supplies power to high-power loads such as fans in the air conditioning system via a load power supply cable and an electromagnetic relay switch. The other connector draws power from the user's power source via the controller power supply cable, and its output supplies power to the air conditioning controller via the controller power supply cable. Besides drawing power from the same user power source, the main circuit power supply loop and the controller power supply loop are isolated by the separation of the electrical connectors and power supply cables, minimizing the interference to the controller caused by the large current drop in the main circuit loop. In addition to meeting the current carrying capacity requirements, the dual power supply cables reasonably increase the conductor cross-sectional area to minimize voltage drop on the lines within the constraints of available space.

[0010] This utility model is equipped with a controller. Based on the return air temperature signal and protection switch signal status of the air conditioning system collected by the controller, the controller drives the electromagnetic relay coil to switch on and off, thereby controlling the on and off of the main circuit power supply circuit and realizing the logical interconnection between the main circuit power supply circuit and the controller power supply circuit, thus realizing the air conditioning function of the air conditioning system.

[0011] This utility model provides a power distribution device for a vehicle air conditioning system, which has the characteristics of simple principle and easy implementation, and is particularly suitable for low-voltage DC air conditioning systems.

[0012] Compared with the prior art, the advantages of this utility model are: 1) Dual electrical connectors and dual power supply cables are provided to enable independent power supply for the controller and the main circuit.

[0013] 2) An electromagnetic relay is installed. After the controller is powered on and working normally, it drives the electromagnetic relay coil to close, and the main circuit power supply circuit is connected to work. This ensures that although the power supply circuit is independent, the air conditioning function is coordinated and unified.

[0014] 3) Dual power supply cables were installed. In addition to meeting the current carrying capacity, the cross-sectional area of ​​the conductors was reasonably increased to minimize the voltage drop on the line within the limits of available space. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of this utility model. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] like Figure 1 As shown, this embodiment discloses a vehicle air conditioning system power distribution device, including a power supply 1, a main circuit power supply cable 2-1, a controller power supply cable 2-2, a #1 electrical connector 3-1, a #2 electrical connector 3-2, two sets of load power supply cables 4-1 and 4-2, an electromagnetic relay 5, a controller signal cable A7-1, a controller signal cable B7-2, and an air conditioning controller 9.

[0018] The input terminal of connector 3-1 (#1) is connected to power supply 1 via main circuit power supply cable 2-1. Connector 3-1 has two output terminals. One output terminal is connected to the power supply terminal of load A via the first set of load power supply cables 4-1, and the other output terminal is connected to the power supply terminal of load B via the second set of load power supply cables 4-2. Electromagnetic relay 5 has two normally open contacts, which are respectively connected to the first set of load power supply cables 4-1 and the second set of load power supply cables 4-2. Power supply 1 supplies power to load A and load B respectively through main circuit power supply cable 2-1, connector 3-1, the two sets of load power supply cables 4-1 and 4-2, and their respective normally open contacts, thus forming the main circuit power supply loop.

[0019] The input terminal of connector 3-2 (#2) is connected to power supply 1 via controller power supply cable 2-2. The output terminal of connector 3-2 (#2) is connected to the power supply terminal of controller 9 via output cable. The voltage output terminal of controller 9 is connected to the coil of electromagnetic relay 5 via controller signal cable A7-1. The signal input terminal of controller 9 is connected to the protection switch 8 and temperature sensor in the air conditioner via controller signal cable B7-2, thus forming the controller power supply circuit. The controller collects temperature and protection signals, monitors the power supply and air conditioning system operating status, drives the main circuit power supply to switch on and off to control the load operation, and realizes the vehicle's air environment regulation function.

[0020] According to ΔU=IR, where R is the internal resistance of the power supply circuit cable, the circuit voltage drop ΔU is directly proportional to both the load current I and the internal resistance R of the power supply circuit cable. Taking a 10kW cooling capacity air conditioner as an example, the main circuit current is approximately 60A, and the control circuit current is approximately 1A, with a current ratio of 60. The cross-sectional area of ​​the main circuit power supply cable is 10 square millimeters, and the cross-sectional area of ​​the controller power supply cable is 1 square millimeter. Data shows that the cable internal resistance ratio is 2 / 19.3, approximately 0.1. From the above data, we can conclude that during normal operation, the voltage drop caused by the cable internal resistance of the main circuit power supply circuit is 6 times that of the controller power supply circuit; the starting current during load startup is approximately 6 times the normal operating current, and the voltage drop during load startup in the main circuit power supply circuit is particularly significant.

[0021] The main circuit power supply circuit and the controller power supply circuit are isolated from each other by the power supply cable through the separation of the electrical connector and the power supply cable. This avoids false alarms caused by the controller's power supply adaptability being inferior to the electrical load due to over- or under-voltage conditions. It also avoids false alarms caused by the signal level rising at the low-level signal terminal of the signal acquisition component due to the internal resistance of the cable. This ensures that the air conditioning system can work normally and orderly whether it is in normal working condition or at the moment of load start-up.

[0022] The preferred embodiments of this utility model have been described in detail above with reference to the accompanying drawings. These embodiments are merely descriptions of preferred embodiments and are not intended to limit the concept and scope of this utility model. The various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. Such combinations, as long as they do not violate the spirit of this utility model, should also be considered as part of this disclosure. To avoid unnecessary repetition, this utility model will not further describe all possible combinations.

[0023] This utility model is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this utility model and without departing from the design idea of ​​this utility model, all modifications and improvements made by those skilled in the art to the technical solution of this utility model should fall within the protection scope of this utility model. The technical content for which protection is sought in this utility model has been fully recorded in the claims.

Claims

1. A power distribution device for a vehicle air conditioning system, characterized in that, Includes a power supply (1), a main circuit power supply cable (2-1), a controller power supply cable (2-2), a #1 electrical connector (3-1), a #2 electrical connector (3-2), several load power supply cables, and an air conditioner controller (9); the power supply (1) is connected to the input end of the #1 electrical connector (3-1) through the main circuit power supply cable (2-1), the output end of the #1 electrical connector (3-1) is connected to the power supply ends of several loads through several load power supply cables, the power supply (1) is also connected to the input end of the #2 electrical connector (3-2) through the controller power supply cable (2-2), and the output end of the #2 electrical connector (3-2) is connected to the power supply end of the controller (9) through the output cable.

2. The vehicle air conditioning system power distribution device according to claim 1, characterized in that, Each load power supply cable is connected to the contact switch of the electromagnetic relay (5), and the voltage output terminal of the controller (9) is connected to the coil of the electromagnetic relay (5) through the controller signal cable A (7-1).

3. The vehicle air conditioning system power distribution device according to claim 1, characterized in that, The signal input terminal of the controller (9) is also connected to the protection switch (8) and temperature sensor in the air conditioner via the controller signal cable.

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