Power panel of rail transit vehicle air-conditioning ventilation system control module

Abstract

The invention relates to a power panel for a control module of an air-conditioning ventilation system of a rail transit vehicle, the power panel inputs a DC110V power supply and outputs a DC5.1 V power supply, the power panel comprises a power management chip (2), a transformer (3) and an output detection feedback circuit (4), the output detection feedback circuit (4) is a voltage feedback circuit, and the transformer (3) is connected with the power management chip (2). The input end of the power management chip (2) is connected with an input power supply, the output end of the power management chip (2) is connected to the input end of the transformer (3), and the output end of the transformer (3) is connected to the input end of the power management chip (2) after passing through the output detection feedback circuit (4). Compared with the prior art, the power panel has the advantages of reducing the failure rate of the power panel, reducing the maintenance cost, improving the usability of the vehicle air-conditioning ventilation system, reducing the production cost and the like.

Description

Technical Field

[0001] The present invention relates to the field of control of air-conditioning and ventilation systems for rail transit vehicles, and particularly to a power supply board for a control module of an air-conditioning and ventilation system for rail transit vehicles. Background Art

[0002] For the control module of the air-conditioning and ventilation system of urban rail transit vehicles, its main function is to collect parameters such as vehicle temperature, humidity, dust concentration, and air flow velocity, process the information collected by the sensors, and then forward the information to the main control unit of the train information management system (MPU). The air-conditioning control module FPC20 consists of two circuit boards, namely a power supply board and a CPU board, which are connected by pins.

[0003] The function of the power supply board is to convert the train's DC110V voltage into direct currents of +DC15V, -DC15V, and DC5.1V to supply power to each part of the air-conditioning control module.

[0004] As Figure 2 shown, the existing power supply board includes a filter circuit, a power management chip, a transformer, an output detection and feedback circuit, and a voltage regulator circuit. The input power supply DC110V is connected to the filter circuit, and the filter circuit, the power management chip, and the transformer are connected in sequence. After the transformer steps down the voltage to DC+15V, DC-15V, and DC5.1V respectively, they are output through the corresponding voltage regulator circuits for use by the corresponding circuits of the air-conditioning control module.

[0005] The existing output detection and feedback circuit is a dual-feedback circuit, including a current feedback circuit and a voltage feedback circuit. The current feedback circuit includes an optocoupler U2, D7, and R11, and the voltage feedback circuit includes an optocoupler U3, R8, R10, R12, C19, U6, and R9, which are used to adjust and stabilize the output circuit.

[0006] During actual maintenance, it is found that the faults of the vehicle air-conditioning control module FPC20 mainly occur in the power supply board part. It is found that the output voltage of the power supply DC5.1V is 0.01 - 0.1V lower after long-term use. Because the power supply board has particularly precise requirements for the detected voltage, this causes the power supply board to not be able to supply power normally, resulting in the damage of the air-conditioning in the entire carriage. After analysis and research, it is found that there is aging of components in the power supply board itself, and there will be a voltage fluctuation of 0.01 - 0.1V due to the difference in the parameters of the components themselves. Summary of the Invention

[0007] The purpose of the present invention is to provide a power supply board for a control module of an air-conditioning and ventilation system for rail transit vehicles to overcome the defects existing in the above-mentioned prior art.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] According to one aspect of the invention, a power supply board for a control module of an air-conditioning ventilation system of a rail transit vehicle is provided. The power supply board inputs a power supply of DC110V and outputs a power supply of DC5.1V. The power supply board includes a power management chip and a transformer. The power supply board further includes an output detection feedback circuit, and the output detection feedback circuit is a voltage feedback circuit. The input end of the power management chip is connected to the input power supply, the output end of the power management chip is connected to the input end of the transformer, and the output end of the transformer is connected to the input end of the power management chip through the output detection feedback circuit.

[0010] Preferably, the output of the power supply board further includes a power supply of DC +15V and a power supply of DC -15V.

[0011] Preferably, the voltage of the voltage feedback circuit is adjustable.

[0012] More preferably, the voltage feedback circuit includes an adjustable resistor potentiometer, and the voltage adjustment of the voltage feedback circuit is achieved through the adjustable resistor potentiometer.

[0013] More preferably, the adjustable resistor potentiometer is a 100-ohm adjustable resistor potentiometer.

[0014] Preferably, the voltage feedback circuit includes an optocoupler, and the optocoupler is an optocoupler with the model PC817.

[0015] More preferably, the power supply board further includes a filter circuit. The input end of the filter circuit is connected to the input power supply, and the output end is connected to the input end of the power management chip.

[0016] More preferably, the power supply board further includes a rectifier filter circuit. The input end of the rectifier filter circuit is connected to the output end of the transformer, the output end of the rectifier filter circuit is connected to the input end of the output detection feedback circuit, and the circuit corresponding to DC5.1V of the air-conditioning ventilation system control module.

[0017] More preferably, the power supply board further includes a second voltage regulator. The input end of the second voltage regulator is connected to the transformer, and the output end is connected to the circuit corresponding to DC +15V of the air-conditioning ventilation system control module.

[0018] More preferably, the power supply board further includes a first voltage regulator. The input end of the first voltage regulator is connected to the transformer, and the output end is connected to the corresponding DC -15V circuit of the air-conditioning ventilation system control module.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1) By using a voltage - adjustable feedback circuit to replace the original dual - feedback circuit, the present invention makes the circuit output of the power supply board adjustable at 5.1V more stable, reduces the failure rate of the power supply board, reduces the occurrence of faults in the FPC20 of the vehicle air - conditioning ventilation system as a whole, and at the same time reduces the maintenance cost;

[0021] 2) The present invention improves the voltage - adjustable feedback circuit (the fixed resistor is improved to an adjustable resistor potentiometer, and the optocoupler is changed to an optocoupler with high reverse breakdown voltage), realizing more stable DC5.1V power output and enhancing the availability of the vehicle air - conditioning ventilation system;

[0022] 3) The present invention reduces the components of the current - feedback circuit (four capacitors are improved to two capacitors), reduces the number of capacitors in the rectification and filtering circuit part corresponding to DC5.1V, and reduces the production cost. Brief Description of the Drawings

[0023] Figure 1 It is a schematic diagram of the framework of the power supply board in the present invention;

[0024] Figure 2 It is a schematic diagram of the principle of the existing power supply board;

[0025] Figure 3 It is a schematic diagram of the principle of the improved power supply board in the present invention;

[0026] In the appendix Figure 1 Among them, 1 is the filtering circuit, 2 is the power management chip, 3 is the transformer, 4 is the output detection and feedback circuit, 5 is the rectification and filtering circuit, 6 is the second voltage regulator, and 7 is the first voltage regulator. Detailed Embodiment

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] This embodiment relates to a power supply board of a control module for a rail transit vehicle air - conditioning ventilation system. The function of the power supply board FPC20 is to convert the train DC110V voltage into direct current of + DC15V, - DC15V, and DC5.1V to supply power to each part of the air - conditioning control module.

[0029] Parameters of the power supply board FPC20 product:

[0030] Input: Direct current of DC70V - 160V,

[0031] Output: DC power of +5.1V 2.5A and ±15V 0.3A,

[0032] Operating temperature: -40°C / +85°C,

[0033] No-load power consumption: 12mA.

[0034] As Figure 1 shown, the frame diagram of the power supply board FPC20.

[0035] The power supply board FPC20 includes a filter circuit 1, a power management chip 2, a transformer 3, an output detection and feedback circuit 4, a rectifier and filter circuit 5, a second voltage regulator 6, and a first voltage regulator 7.

[0036] The input power supply DC110V is connected to the filter circuit 1. The filter circuit 1, the power management chip 2, and the transformer 3 are connected in sequence. After the transformer 3 transforms the voltage to DC +15V, DC -15V, and DC5.1V respectively, they are output through the rectifier and filter circuit 5, the second voltage regulator 6, and the first voltage regulator 7. The input end of the output detection and feedback circuit 4 is connected to the output end of the rectifier and filter circuit 5, and the output end of the output detection and feedback circuit 4 is connected to the input end of the power management chip 2.

[0037] After the power supply board is powered on with DC110V, the power management chip 2 needs to control the transformer 3 to perform voltage conversion through the output detection and feedback circuit 4, and transform the voltage to DC 15V, -DC15V, and DC5.1V for output, so as to ensure the operation of each part of the circuit of the vehicle air-conditioning ventilation system control module.

[0038] As Figure 3 shown, the power supply board of the present invention uses the TOP247YN power management chip as the main control. When working, the input DC110V passes through the filter composed of LI and C1, the power management chip U1 and the transformer T1 form a switching circuit, and enters the voltage regulator U4 through the 7th pin of the secondary of the transformer T1 to output DC15V 0.3A. The 5th pin of the secondary of the transformer T1 enters the voltage regulator U5 to output DC -15V 0.3A after filtering. The 10th pin of the secondary of the transformer T1 passes through D4, L2, C5, and D8 for rectification and voltage regulation to output DC5.1V 2.5A.

[0039] In order to ensure that the power supply output is stable at 5.1V, as Figure 3 shown, the output detection and feedback circuit 4 is changed from a dual-feedback circuit to a voltage-adjustable feedback circuit, so as to ensure the stable output of 5.1V voltage by manually adjusting the voltage when the parameters and components age differently after a long service life. The dual-feedback circuit includes a current-adjustable feedback circuit and a voltage-adjustable feedback circuit.

[0040] The voltage feedback circuit includes a variable resistor potentiometer. The voltage of the voltage feedback circuit is adjustable and is achieved through the variable resistor potentiometer to meet the requirements of a strict detection voltage.

[0041] The detailed main improvements of the output detection feedback circuit 4 are as follows:

[0042] 1) Turn off the current feedback part, corresponding to Figure 2 U2, D7, and R11.

[0043] 2) At the same time, improve the voltage feedback circuit part, including:

[0044] 21) Change the resistor R9 (corresponding to R12 before improvement) of the voltage feedback circuit to a variable resistor potentiometer of 100Ω;

[0045] 22) Replace the optocoupler with a higher reverse voltage withstand (corresponding to the optocoupler U3 before improvement). The model of the optocoupler U3 before improvement is EL317, and the reverse voltage withstand is 3750V; the model of the improved optocoupler U6 is PC817, and the reverse voltage withstand is 5000V.

[0046] In addition, improvements have been made to the rectifier filter circuit 5 corresponding to the output of DC5.1V: The original four capacitors in parallel of 470uF: C3, C7, C18, and C5 are replaced with two capacitors in parallel of 1000uF: C3 and C5, making the 5.1V output more stable.

[0047] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A power supply board for a control module of an air-conditioning and ventilation system of a rail transit vehicle. The power supply board inputs a power supply of DC110V and outputs a power supply of DC5.1V. The power supply board includes a power management chip (2) and a transformer (3), and is characterized in that, The power board further comprises an output detection feedback circuit (4), which is a voltage feedback circuit. The input end of the power management chip (2) is connected to the input power supply, the output end of the power management chip (2) is connected to the input end of the transformer (3), and the output end of the transformer (3) is connected to the input end of the power management chip (2) after passing through the output detection feedback circuit (4).

2. The power supply board of the control module of the air-conditioning and ventilation system for rail transit vehicles according to claim 1, characterized in that, The output of the power board also includes a DC+15V power supply and a DC-15V power supply.

3. The power supply board of a control module for an air conditioning and ventilation system of a rail transit vehicle according to claim 1, characterized in that, The voltage of the voltage feedback circuit is adjustable.

4. The power supply board of the control module for the air conditioning and ventilation system of a rail transit vehicle according to claim 3, characterized in that, The voltage feedback circuit includes an adjustable resistor potentiometer, and the voltage adjustment of the voltage feedback circuit is achieved through the adjustable resistor potentiometer.

5. The power board of the rail transit vehicle air conditioning and ventilation system control module according to claim 4, characterized in that: The adjustable resistance potentiometer is a 100 ohm adjustable resistance potentiometer.

6. The power board of the rail transit vehicle air conditioning and ventilation system control module according to claim 1, characterized in that: The voltage feedback circuit includes an optical coupler, and the optical coupler is an optical coupler of model PC817.

7. The power supply board of the control module for the air-conditioning and ventilation system of a rail transit vehicle according to claim 1, characterized in that, The power board further comprises a filter circuit (1), wherein the input end of the filter circuit (1) is connected to the input power supply, and the output end is connected to the input end of the power management chip (2).

8. The power board of the rail transit vehicle air conditioning and ventilation system control module according to claim 1, characterized in that: The power board also includes a rectifier filter circuit (5), the input end of the rectifier filter circuit (5) is connected to the output end of the transformer (3), the output end of the rectifier filter circuit (5) is connected to the input end of the output detection feedback circuit (4), and the circuit corresponding to DC5.1V of the air conditioning and ventilation system control module.

9. The power supply board of the control module for the air-conditioning and ventilation system of a rail transit vehicle according to claim 1, characterized in that, The power board also includes a second voltage stabilizer (6), the input end of which is connected to the transformer (3), and the output end of which is connected to the DC+15V corresponding circuit of the air conditioning and ventilation system control module.

10. The power supply board of the control module of the air conditioning and ventilation system for rail transit vehicles according to claim 1, characterized in that, The power board also includes a first voltage stabilizer (7), the input end of which is connected to the transformer (3), and the output end of which is connected to the corresponding DC-15V circuit of the air conditioning and ventilation system control module.

Images