Train air conditioner board card

Abstract

The utility model discloses a train air conditioner board card which comprises a power supply board card, a power line assembly and a digital board card. The digital board card comprises a power supply input terminal and a control circuit, the output end of the power supply board card is connected with the input end of the power supply input terminal through a power line assembly, and the output end of the power supply input terminal supplies power to the control circuit; the power line assembly comprises a plurality of power lines which are connected in parallel between the output end of the power board card and the input end of the power input terminal. The train air conditioner board card provided by the utility model reduces the offline problem of a digital board card caused by voltage drop when the impedance changes, improves the stability of a vehicle air conditioner, and reduces the offline failure rate.

Description

Technical Field

[0001] The utility model relates to a train air-conditioning board card, belonging to the technical field of train air conditioners. Background Art

[0002] At present, train air-conditioning board cards often adopt digital methods to control relays (abbreviated as digital boards or DO boards), drive external high-power electronic devices such as damper actuators, liquid path solenoid valves, and pneumatic solenoid valves, and at the same time, use electrical isolation components such as control relays to isolate high and low voltages, so as to achieve the effect of weak current controlling strong current. Common air-conditioning board cards are single-wire powered by a power board card for the digital board card. In actual work, there will be continuous vibrations on the train, and at the same time, the power supply lines will also age after long-term operation. Therefore, the power supply lines will have virtual connections due to aging and vibration of the power input terminal pins, which will further lead to an increase in impedance. When the impedance of the power supply end of the digital board card increases (affected by factors such as line aging and pin virtual connection), the opening voltages of multiple relays will have a superimposed reduction effect, and at the same time, the opening currents of multiple relays will increase accordingly. As Figure 1 shown, according to U = IR, in a series circuit, when I increases and R increases, the line and the connector pins will share part of the voltage. The line and the connector pins will share part of the voltage, plus the opening voltage of the relay, which will cause the voltage to be lower than the threshold value, resulting in the digital board card going offline. At present, the main solution to the problem of the digital board of the train air-conditioning controller going offline is through software methods to monitor the voltage of the digital board card. When the voltage is lower than the set threshold value, it will be reset to avoid abnormal offline problems. This method requires an increase in hardware structure costs and additional software algorithm design. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a train air-conditioning board card, which reduces the offline problem caused by the voltage drop when the impedance of the digital board card changes, improves the stability of the vehicle air conditioner, and reduces the offline failure rate.

[0004] To solve the above technical problems, the technical solution of the utility model is:

[0005] A train air-conditioning board card, which includes a power board card, a power cord assembly, and a digital board card;

[0006] The digital board card includes a power input terminal and a control circuit. The output end of the power board card is connected to the input end of the power input terminal through the power cord assembly, and the output end of the power input terminal supplies power to the control circuit;

[0007] The power cord assembly includes multiple power cords, and the multiple power cords are connected in parallel between the output end of the power board card and the input end of the power input terminal.

[0008] Further, the power supply board card includes a power conversion circuit and a power supply output terminal. The input end of the power conversion circuit is connected to the DC110V power supply of the train, the output end of the power conversion circuit is connected to the input end of the power supply output terminal, and the output end of the power supply output terminal is connected to the input end of the power input terminal through a power line assembly.

[0009] Further, the power supply output terminal is a multi-core connector.

[0010] Further, the control circuit includes an MCU module and a relay. The relay is connected to the MCU module, and the output end of the power input terminal supplies power to the MCU module and the relay.

[0011] Further, the power input terminal is a multi-core connector.

[0012] With the above technical solutions, the power supply board card of the present utility model supplies power to the digital board card through multiple parallel power lines to achieve the purpose of reducing the impedance of the power supply line, thereby ensuring that the voltage of the digital board card is higher than the threshold value, keeping the digital board card in an online state, and reducing the problem of the digital board card going offline caused by the increase in impedance due to long-term operation aging and vibration of the line. At the same time, multiple parallel power lines are more stable and reliable in power supply than single-line power supply. Even if one or several power lines fail, the power supply board card can still supply power to the digital board card through other power lines. Description of the Drawings

[0013] Figure 1 It is the impedance equivalent circuit diagram of the power supply board card supplying power to the digital board card by single line in the prior art of the present utility model;

[0014] Figure 2 It is the principle block diagram of a train air-conditioning board card of the present utility model;

[0015] Figure 3 It is the electrical schematic diagram of the power supply board card of the present utility model supplying power to the digital board card through a power line assembly;

[0016] Figure 4 It is the impedance equivalent circuit diagram of the existing power supply board card supplying power to the digital board card by multiple lines in the present utility model. Detailed Embodiments

[0017] In order to make the content of the present utility model be more clearly understood, the following further details the present utility model according to specific embodiments and in conjunction with the drawings.

[0018] As Figure 2 shown, this embodiment provides a train air-conditioning board card, which includes a power supply board card, a power line assembly, and a digital board card. The power supply board card supplies power to the digital board card through the power line assembly.

[0019] As Figure 2 shown, the digital board card of this embodiment includes a power input terminal and a control circuit. The output terminal of the power board card is connected to the input terminal of the power input terminal through a power line assembly. The output terminal of the power input terminal supplies power to the control circuit, and the power input terminal is a multi-core connector. The control circuit includes an MCU module and a relay. The relay is connected to the MCU module. The output terminal of the power input terminal supplies power to the MCU module and the relay. The power supply of the digital board card comes from the power board card. After the digital board card is powered on and works normally, the on / off of the relay is controlled by the MCU module, and the relay is used to control the subsequent high-power electronic devices.

[0020] As Figure 2 shown, the power board card of this embodiment includes a power conversion circuit and a power supply output terminal. The input terminal of the power conversion circuit is connected to the DC110V power supply of the train. The output terminal of the power conversion circuit is connected to the input terminal of the power supply output terminal. The output terminal of the power supply output terminal is connected to the input terminal of the power input terminal through a power line assembly. The power supply output terminal is a multi-core connector. The train usually uses a DC110V power supply. The power board card converts the DC110V power supply into a DC5V power supply for the control circuit on the digital board card.

[0021] As Figure 2 、 3 shown, the power line assembly of this embodiment includes multiple power lines. The multiple power lines are connected in parallel between the output terminal of the power board card and the input terminal of the power input terminal. Two multi-core cable plugs are provided at both ends of the power line assembly. The two multi-core cable plugs are directly connected to the multiple power lines. By plugging the two multi-core cable plugs into the power supply output terminal and the power input terminal respectively, the power supply of the power board card to the digital board card can be completed. Since the power line assembly includes multiple parallel power lines, the line impedance is paralleled. It can be obtained from the Figure 4 equivalent circuit that the total resistance value after the resistors are connected in parallel is always smaller than the resistance value of any resistor, so that the total line impedance becomes smaller after parallel connection.

[0022] In the above specific embodiments, the technical problems solved, technical solutions and beneficial effects of the present invention are further described in detail. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A train air-conditioning board, characterized in that: It includes a power supply board, a power cord assembly and a digital board; The digital board includes a power input terminal and a control circuit. The output end of the power supply board is connected to the input end of the power input terminal through the power cord assembly, and the output end of the power input terminal supplies power to the control circuit; The power cord assembly includes multiple power cords, and the multiple power cords are connected in parallel between the output end of the power supply board and the input end of the power input terminal.

2. The train air-conditioning board card according to claim 1, characterized in that: The power supply board includes a power conversion circuit and a power supply output terminal. The input end of the power conversion circuit is connected to the DC110V power supply of the train, the output end of the power conversion circuit is connected to the input end of the power supply output terminal, and the output end of the power supply output terminal is connected to the input end of the power input terminal through the power cord assembly.

3. The train air-conditioning board card according to claim 2, characterized in that: The power supply output terminal is a multi-core connector.

4. The train air-conditioning board card according to claim 1, characterized in that: The control circuit includes an MCU module and a relay. The relay is connected to the MCU module, and the output end of the power input terminal supplies power to the MCU module and the relay.

5. The train air-conditioning board card according to claim 1, characterized in that: The power input terminal is a multi-core connector.

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