Train MVB repeater power panel

Abstract

The utility model relates to a train MVB repeater power supply board, the power supply board comprises a filter circuit, a power supply management unit and a transformer rectification circuit which are electrically connected in sequence, the input end of the filter circuit is connected with a power supply input end, and the output end of the transformer rectification circuit is connected with a power supply output end; the power panel further comprises an output detection feedback circuit. The output end of the transformer rectification circuit is electrically connected with the input end of an output detection feedback circuit, and the output end of the output detection feedback circuit is electrically connected with the input end of a power management unit; the power management unit comprises a power management chip. Compared with the prior art, the utility model has the advantages of more stable output power supply and the like.

Description

Technical Field

[0001] This utility model relates to a power supply board, and more particularly to a power supply board for a train MVB repeater. Background Technology

[0002] The MVB repeater is part of the Train Communication Network (TCN). The TCN network consists of WTB and MVB. WTB is a twisted-wire train bus, and MVB is a serial data communication bus primarily used for interconnecting devices requiring interoperability and interchangeability. The MVB repeater is a simple network interconnection device, mainly performing physical layer functions. It is responsible for bit-by-bit information transmission between two nodes at the physical layer, performing signal replication, adjustment, and amplification to extend the network length. However, in actual operation, it was found that the MVB repeater power board's function is to convert the train's DC36-110V voltage to DC9.1V and power subsequent circuits. The MVB power board has two power supply paths, one of which lacks DC9.1V output, causing communication nodes to lack linkage and resulting in communication problems.

[0003] How to achieve stable power supply to the MVB repeater power board has become a technical problem that needs to be solved. Utility Model Content

[0004] The purpose of this utility model is to overcome the defects of the existing technology and provide a train MVB repeater power board.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] According to one aspect of the present invention, a power board for a train MVB repeater is provided. The power board includes a filter circuit, a power management unit, and a transformer rectifier circuit that are electrically connected in sequence. The input terminal of the filter circuit is connected to the power input terminal, and the output terminal of the transformer rectifier circuit is connected to the power output terminal.

[0007] The power board also includes an output detection feedback circuit; the output terminal of the transformer rectifier circuit is electrically connected to the input terminal of the output detection feedback circuit, and the output terminal of the output detection feedback circuit is electrically connected to the input terminal of the power management unit.

[0008] The power management unit includes a power management chip U1, a capacitor C3, a diode D3, a diode D4, a capacitor C4, a resistor R1, a resistor R2, and a diode D2. The first and second pins of the power management chip U1 are both connected to one end of the capacitor C3. The third pin is connected in series with the resistor R3 and then connected to the other end of the capacitor C3 and the transformer rectifier circuit. The fourth pin is connected to the output detection feedback circuit. The fifth pin is connected to the series diodes D3 and D4. The seventh pin is connected to the parallel capacitor C4 and the resistor R1. The eighth pin is connected in sequence with the resistor R2 and the diode D2 and then connected to the capacitor C3, the diode D3, the capacitor C4, and the other end of the resistor R1.

[0009] More preferably, the transformer rectifier circuit includes a transformer and rectifier diodes;

[0010] The primary side of the transformer is connected to the output of the filter circuit, and the secondary side is connected to the rectifier tube.

[0011] Preferably, the transformer is a transformer with 1 primary and 2 secondary transformers;

[0012] The transformer rectifier circuit also includes a power supply unit;

[0013] The other side of the transformer is connected to the power supply unit.

[0014] More preferably, the power supply unit includes a detector tube and a capacitor.

[0015] More preferably, the power supply unit is connected to both the power management unit and the output detection feedback circuit.

[0016] More preferably, the maximum rectified output current of the rectifier diode D1 is 2A.

[0017] Preferably, the input terminal of the output detection feedback circuit is connected to the output terminal of the transformer rectifier circuit;

[0018] The output detection feedback circuit includes a Zener diode and an optocoupler. The positive terminal of the Zener diode is connected to the anode of the optocoupler, and the negative terminal is connected to the output terminal of the transformer rectifier circuit.

[0019] The collector of the optocoupler is connected to the transformer rectifier circuit, the emitter is connected to the power management unit, and the cathode is grounded.

[0020] Preferably, the power management chip is a TOP244GN chip.

[0021] Preferably, the power input terminal is DC36-110V.

[0022] Preferably, the power output terminal is DC 9.1V.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] This invention redesigns the power management unit and transformer rectifier circuit, making the output power supply more stable, reducing the failure rate of the MVB repeater, and thus ensuring the stability of train communication. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the power supply board of the MVB repeater in this utility model;

[0026] Figure 2 This is a circuit diagram of the MVB repeater power board in this utility model;

[0027] 1 is the filter circuit, 2 is the power management unit, 3 is the transformer rectifier circuit, and 4 is the output detection feedback circuit. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present utility model.

[0029] This embodiment relates to a train MVB repeater power board, which converts the train's DC36-110V voltage to DC9.1V to power subsequent circuits.

[0030] like Figure 1 The power board includes a filter circuit 1, a power management unit 2, a transformer rectifier circuit 3, and an output detection feedback circuit 4.

[0031] The input DC36-110V passes through filter circuit 1, power management unit 2, and transformer rectifier circuit 3 in sequence to complete voltage conversion, outputting DC9.1V power. The output of transformer rectifier circuit 3 (output DC9.1V power) is fed back to power management unit 2 after passing through output detection feedback circuit 4.

[0032] like Figure 2The filter circuit 1 includes a fuse F1, a parallel varistor R4, capacitors C1 and C2, and an inductor section. The inductor section includes a first inductor, a second inductor, and a third inductor. The first inductor consists of inductors L1 and L2 connected in series, the second inductor consists of inductors L3 and L4 connected in series, and the third inductor is L5. One end of the first inductor is connected to the power input terminal, and the other end is connected to the third inductor. One end of the second inductor is grounded, and the other end is connected to the third inductor.

[0033] Power management unit 2 includes capacitor C3, diodes D3 and D4, capacitor C4, resistor R1, and power management chip U1 (TOP244GN). The output of filter circuit 1 is connected to one end of capacitor C3, diode D3, capacitor C4, and resistor R1 respectively. Diodes D3 and D4 are connected in series to pin 5 of U1. Capacitor C4 and resistor R1 are connected in parallel to pin 7 of U1. Pins 1 and 2 of U1 are connected to one end of capacitor C3. Pin 3 is connected in series with resistor R3 and then to the other end of capacitor C3. Pin 4 is connected to optocoupler PC817 of output detection feedback circuit 4. Pin 8 is connected to resistor R2 and diode D2 and then to the other end of capacitor C3, diode D3, capacitor C4, and resistor R1.

[0034] The transformer rectifier circuit 3 includes transformer T2, rectifier diode D1, and a power supply unit. Transformer T2 is a 1-primary-2-secondary transformer. The primary side is connected to the output of filter circuit 1, the first secondary side is connected to rectifier diode D1, and the second secondary side is connected to the power supply unit. The power supply unit includes detector diode D6 and capacitor C7, which supply power to power management unit 2 and output detection feedback circuit 4, respectively. Rectifier diode D1 uses a B2100B rectifier diode, which maintains its withstand voltage, current, and junction capacitance even under prolonged high-voltage operating conditions, improving the stability of the power supply circuit output and thus reducing MVB repeater failures. The B2100B rectifier diode supports a maximum rectified output current of 2A and has an operating and storage temperature range of -65 ~ +150℃. It is suitable for circuits requiring fast recovery and high efficiency, especially in low-voltage and high-frequency applications.

[0035] The input terminal of the output detection feedback circuit 4 is connected to the output terminal of the transformer rectifier circuit 3 (i.e., the output DC 9.1V). After passing through the Zener diode D5, the voltage enters the anode of the optocoupler PC817, and the cathode of the optocoupler PC817 is grounded. The collector of the optocoupler PC817 is connected to the power supply unit, and the emitter is connected to the fourth pin of U1.

[0036] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A train MVB repeater power board, characterized in that, The power board comprises a filter circuit (1), a power management unit (2) and a transformer rectifier circuit (3) connected in sequence, the input end of the filter circuit (1) is connected with a power input end, and the output end of the transformer rectifier circuit (3) is connected with a power output end; The power board further comprises an output detection feedback circuit (4); the output end of the transformer rectifier circuit (3) is electrically connected with the input end of the output detection feedback circuit (4), and the output end of the output detection feedback circuit (4) is electrically connected with the input end of the power management unit (2); The power management unit (2) comprises a power management chip (U1), a capacitor (C3), a diode (D3), a diode (D4), a capacitor (C4), a resistor (R1), a resistor (R2) and a diode (D2); the first pin and the second pin of the power management chip (U1) are connected with one end of the capacitor (C3), the third pin is connected with the resistor R3 in series and then connected with the other end of the capacitor (C3) and the transformer rectifier circuit (3) respectively, the fourth pin is connected with the output detection feedback circuit (4), the fifth pin is connected with the diode (D3) and the diode (D4) in series, the seventh pin is connected with the capacitor (C4) and the resistor (R1) in parallel, and the eighth pin is connected with the capacitor (C3), the diode (D3), the capacitor (C4) and the other end of the resistor (R1) after being connected with the resistor (R2) and the diode (D2) in sequence.

2. The train MVB repeater power board of claim 1, wherein, The transformer rectifier circuit (3) comprises a transformer (T2) and a rectifier tube (D1); The primary side of the transformer (T2) is connected with the output of the filter circuit (1), and the secondary side is connected with the rectifier tube (D1).

3. The train MVB repeater power board of claim 2, wherein, The transformer (T2) is a transformer with one primary side and two secondary sides. The transformer rectifier circuit (3) further comprises a power supply unit; The other secondary side of the transformer (T2) is connected with the power supply unit.

4. The power supply board of a train MVB repeater according to claim 3, characterized in that, The power supply unit comprises a detector tube (D6) and a capacitor (C7).

5. The power supply board of a train MVB repeater according to claim 3, characterized in that, The power supply unit is connected with the power management unit (2) and the output detection feedback circuit (4) respectively.

6. The train MVB repeater power board of claim 2, wherein, The maximum rectification output current of the rectifier tube (D1) is 2A.

7. The train MVB repeater power board of claim 1, wherein, The input end of the output detection feedback circuit (4) is connected with the output end of the transformer rectifier circuit (3); The output detection feedback circuit (4) comprises a voltage stabilizing diode (D5) and an optocoupler, the anode of the voltage stabilizing diode (D5) is connected with the anode of the optocoupler, and the cathode is connected with the output end of the transformer rectifier circuit (3); The collector of the optocoupler is connected with the transformer rectifier circuit (3), the emitter is connected with the power management unit (2), and the cathode is grounded.

8. The train MVB repeater power board of claim 1, wherein, The power management chip (U1) is a TOP244GN chip.

9. The train MVB repeater power board of claim 1, wherein, The power input end is DC 36-110V.

10. The power supply board of a train MVB repeater according to claim 1, characterized in that, The power output end is DC 9.1V.

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