A power supply device for a turnout signal power supply module

Abstract

The utility model relates to a power supply device for a turnout signal power supply module, the device comprising a high-frequency transformer (2), an output rectification and filtering unit (3), a main MOS unit, a PWM control circuit unit (9) and an active magnetic reset unit; the primary side of the high-frequency transformer (2) is connected to an input direct current, the secondary side is connected to the output rectification and filtering unit (3), the primary side of the high-frequency transformer (2) is connected to the main MOS unit and the active magnetic reset unit respectively; the input end of the PWM control circuit unit (9) is connected to the output rectification and filtering unit (3), and the output end is connected to the main MOS unit and the active magnetic reset unit. Compared with the prior art, the utility model has the advantages of converting DC24V to DC21V, more stable output current, long service life, etc.

Description

Technical Field

[0001] The utility model relates to the field of rail transit signal control, in particular to a power supply device of a turnout signal module. Background Art

[0002] The turnout signal power supply module ACR150-4DB / KE / L for rail transit signal control has the main function of providing 3.4V14A, 5.1V14A, 12V2A and -12V1A power to the turnout signal system.

[0003] During the actual maintenance process, it was found that the fault mainly occurred in the internal 24V to 21V power board. Part of the power board was damaged, resulting in the inability to provide power to the turnout signal module, so that the turnout could not work normally.

[0004] How to provide a stable power supply to the turnout signal module has become a technical problem that needs to be solved. Utility Model Content

[0005] The purpose of the utility model is to provide a power supply device for a turnout signal module in order to overcome the defects of the prior art.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] According to one aspect of the utility model, a power supply device for a turnout signal power supply module is provided, the device comprising a high-frequency transformer, an output rectifier and filter unit, a main MOS unit, a PWM control circuit unit and an active magnetic reset unit;

[0008] The primary side of the high-frequency transformer is connected to the input direct current, the secondary side is connected to the output rectifier filter unit, and the primary side of the high-frequency transformer is connected to the main MOS unit and the active magnetic reset unit respectively;

[0009] The input end of the PWM control circuit unit is connected to the output rectification and filtering unit, and the output end is connected to the main MOS unit and the active magnetic reset unit.

[0010] Preferably, the device further comprises a filter circuit unit, the input end of the filter circuit unit is the input direct current, and the output end is a high-frequency transformer.

[0011] Preferably, the device further comprises a current sampling circuit unit, the current sampling circuit unit is connected to the main MOS unit, and the output end of the current sampling circuit unit is connected to the PWM control circuit unit.

[0012] Preferably, the device further comprises a first capacitor, which is connected to the high-frequency transformer and the active magnetic reset unit respectively.

[0013] More preferably, the first capacitor is a capacitor with a withstand voltage of at least 500V.

[0014] Preferably, the main MOS unit comprises a power switch tube and a second capacitor connected in parallel, and the power switch tube is a MOS tube.

[0015] Preferably, the active magnetic reset unit comprises an active magnetic reset switch tube and a clamping diode connected in parallel.

[0016] More preferably, the active magnetic reset switch tube is a MOS tube.

[0017] Preferably, the input direct current is a DC24V power supply.

[0018] Preferably, the output direct current of the output rectifying and filtering unit is a DC21V power supply.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] 1. The filter circuit unit of the utility model allows the input 24V voltage to reach the high-frequency transformer more stably, and converts the input DC24V into AC21V through the PWM control circuit and the power switch tube, and then outputs it to the rectifier filter circuit unit to convert the AC21V into DC21V, which is output to the switch signal module for use.

[0021] 2. The clamping diode of the utility model is turned on, so that the voltage of the power switch tube is zero, and zero voltage switching is achieved.

[0022] 3. The active magnetic reset unit and the first capacitor of the utility model cooperate to restore the high-frequency transformer to the initial value of the magnetic flux, making the output current more stable.

[0023] 4. The withstand voltage of the first capacitor of the utility model is at least 500V, so that when the excitation current increases, the first capacitor has a higher withstand voltage, a longer service life, and a more stable operation of the power supply device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of the power supply device in the utility model;

[0025] Figure 2 It is a circuit diagram of the power supply device in the utility model;

[0026] In the accompanying drawings, 1: filter circuit unit, 2: high frequency transformer, 3: output rectifier filter unit, 4: second capacitor, 5: power switch tube, 6: current sampling circuit unit, 7: first capacitor, 8: active magnetic reset switch tube 8, PWM control circuit unit 9, clamping diode 10. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0028] This embodiment relates to a power supply device for a turnout signal module, such as Figure 1 As shown, the device includes a filter circuit unit 1, a high-frequency transformer 2, an output rectification and filtering unit 3, a main MOS unit, a current sampling circuit unit 6, a first capacitor 7, an active magnetic reset unit and a PWM control circuit unit 9.

[0029] The main MOS unit includes a second capacitor 4 and a power switch tube 5 connected in parallel, and the active magnetic reset unit includes an active magnetic reset switch tube 8 and a clamping diode 10 connected in parallel.

[0030] The primary side of the high frequency transformer 2 is connected to the input direct current, and the secondary side is connected to the output rectifier filter unit 3. The primary side of the high frequency transformer 2 is connected to the main MOS unit and the active magnetic reset unit respectively;

[0031] The input of the PWM control circuit unit 9 is the feedback of the output rectification and filtering unit 3, and the PWM is output to the main MOS unit and the active magnetic reset unit;

[0032] The current sampling circuit unit 6 is connected to the main MOS unit, and the output end of the current sampling circuit unit 6 is connected to the PWM control circuit unit 9 .

[0033] The first capacitor 7 is connected to the high frequency transformer 2 and the active magnetic reset unit respectively.

[0034] The input end of the filter circuit unit 1 is the input direct current, and the output end is the high-frequency transformer 2 .

[0035] The filter circuit unit 1 filters the input direct current and sends it to the high-frequency transformer 2, wherein the input direct current is DC24V.

[0036] The PWM control circuit unit 9 and the power switch tube 5 convert the input DC power into AC21V, and then the output rectifier and filter unit 3 converts the AC21V into DC21V, which is output for use by the turnout signal module.

[0037] The PWM control circuit unit 9 performs current sampling and voltage sampling from the current sampling circuit unit 6 and the output rectification and filtering unit 3 respectively, and then outputs a PWM signal to the power switch tube 5 and the active magnetic reset switch tube 8 .

[0038] The PWM of the power switch tube 5 is turned on, and the high-frequency transformer 2 transmits electrical energy from the primary side to the secondary side.

[0039] The PWM control circuit unit 9 controls the active magnetic reset switch tube 8 to turn on, and the excitation current of the high-frequency transformer 2 increases in the reverse direction. The excitation current passes through the first capacitor 7 and the active magnetic reset switch tube 8 to restore the high-frequency transformer 2 to the initial value of the magnetic flux.

[0040] The active magnetic reset switch tube 8 is turned off, and the excitation inductance of the high-frequency transformer 2 resonates with the active magnetic reset switch tube 8 again.

[0041] The clamping diode 10 is turned on, so that the voltage of the power switch tube 5 is zero, thereby achieving zero voltage turn-on.

[0042] The second capacitor 4 is charged through the clamping diode 10 and discharged through the PWM of the power switch tube 5 .

[0043] like Figure 2 The figure shows a circuit diagram of the utility model, where the input direct current Vi is DC24V, Cin is a filter circuit unit, Cc is a first capacitor, S2 and VDc in parallel form an active magnetic reset unit, S1 and Cs in parallel form a main MOS unit, S1 is turned off, the voltage of the second capacitor Cs rises to the input voltage value Vi, and the excitation current rises to the maximum.

[0044] The first capacitor Cc is a 500V 100NF chip capacitor.

[0045] S1 is turned on, and the high-frequency transformer transfers electrical energy from the primary side N1 to the secondary side N2.

[0046] The capacitor Cs resonates with the excitation inductor, and the drain voltage of S1 rises to the sum of the input voltage value Vi and the excitation voltage, while the excitation inductor current decreases.

[0047] Capacitor Cs is charged through clamping diode VDc and discharged through S1.

[0048] S2 is turned on, and the excitation current of the high-frequency transformer increases in the reverse direction. The excitation current passes through capacitor Cc and S2 to restore the high-frequency transformer to the initial value of the magnetic flux.

[0049] like Figure 2 As shown, the rectifier and filter unit includes VD1, VD2, C and RL, which converts the alternating current AC21V into direct current Vo, i.e. DC21V, and outputs it for use by the turnout signal module.

[0050] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A power supply device for a turnout signal power supply module, characterized in that: The device comprises a high-frequency transformer (2), an output rectification and filtering unit (3), a main MOS unit, a PWM control circuit unit (9) and an active magnetic reset unit; The primary side of the high-frequency transformer (2) is connected to the input direct current, and the secondary side is connected to the output rectification and filtering unit (3). The primary side of the high-frequency transformer (2) is respectively connected to the main MOS unit and the active magnetic reset unit; The input end of the PWM control circuit unit (9) is connected to the output rectification and filtering unit (3), and the output end is connected to the main MOS unit and the active magnetic reset unit.

2. A power supply device for a turnout signal power supply module according to claim 1, characterized in that: The device also comprises a filter circuit unit (1), the input end of the filter circuit unit (1) is input direct current, and the output end is a high-frequency transformer (2).

3. The power supply device of a turnout signal power supply module according to claim 1, characterized in that: The device further comprises a current sampling circuit unit (6), wherein the current sampling circuit unit (6) is connected to the main MOS unit, and the output end of the current sampling circuit unit (6) is connected to the PWM control circuit unit (9).

4. The power supply device of a turnout signal power supply module according to claim 1, characterized in that: The device also includes a first capacitor (7), which is connected to the high-frequency transformer (2) and the active magnetic reset unit respectively.

5. A power supply device for a turnout signal power supply module according to claim 4, characterized in that: The first capacitor (7) is a capacitor with a withstand voltage of at least 500V.

6. The power supply device of a turnout signal power supply module according to claim 1, characterized in that: The main MOS unit comprises a power switch tube (5) and a second capacitor (4) connected in parallel, and the power switch tube (5) is a MOS tube.

7. The power supply device of a turnout signal power supply module according to claim 1, characterized in that: The active magnetic reset unit comprises an active magnetic reset switch tube (8) and a clamping diode (10) connected in parallel.

8. The power supply device of the turnout signal power supply module according to claim 7, characterized in that: The active magnetic reset switch tube (8) is a MOS tube.

9. The power supply device of a turnout signal power supply module according to claim 1, characterized in that: The input direct current is a DC24V power supply.

10. The power supply device of a turnout signal power supply module according to claim 1, characterized in that: The output direct current of the output rectifying and filtering unit (3) is a DC21V power supply.

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