Ventilation emergency inversion power supply equipment for rail transit vehicle

Abstract

The utility model relates to a rail transit vehicle ventilation emergency inversion power supply device comprising a detection circuit comprising a bridge rectifier circuit, a first voltage division circuit, a comparator and an optocoupler, the input end of the bridge rectifier circuit is connected to a vehicle main loop power supply through a fuse, and the output end is connected to the first voltage division circuit; the voltage division output end of the first voltage division circuit is connected to one of the inverted input ends of the comparator, the positive phase input end of the comparator is connected to the first direct-current reference power supply module, the power supply input end is connected to the positive electrode of the first direct-current power supply, and the output end is connected to the negative electrode of the input end of the optocoupler. The anode of the input end of the optocoupler is connected to the anode of the first direct-current power supply; the input end of the signal processing circuit is connected to the output end of the optocoupler, and the output end is connected to the controller; the output end of the controller is connected to a coil of the main relay, and a contact of the main relay is arranged between the standby power supply and the inverter. Compared with the prior art, the device has the advantages of stability, reliability and the like.

Description

Technical Field

[0001] The utility model relates to an emergency ventilation system for rail transit vehicles, in particular to an emergency inverter power supply device for ventilation of rail transit vehicles. Background Technique

[0002] In rail AC vehicles, the air conditioning system is an important part of maintaining the comfort of the passenger compartment. Generally, the air conditioning system is powered by the vehicle main circuit power supply AC 380V. When the vehicle main circuit power supply AC 380V fails, in order to maintain a certain degree of comfort, in the prior art, an inverter for emergency ventilation is usually set up to invert the DC 110V of the train battery into three-phase alternating current for the ventilator of the air conditioning unit to work under frequency reduction and voltage reduction. The return air valve of the air conditioning unit is fully closed, and the fresh air valve is fully opened. The air conditioning unit operates with all fresh air to provide fresh air inside the vehicle, increase the oxygen content inside the carriage, and reduce the carbon dioxide content.

[0003] However, in the actual application process, in the prior art, there is a problem of high failure rate, resulting in the abnormal operation of the emergency ventilation inverter. Content of the Utility Model

[0004] The purpose of the utility model is to provide an emergency inverter power supply device for ventilation of rail transit vehicles. By adding a fuse between the vehicle main circuit power supply and the bridge rectifier circuit, the problem that the emergency ventilation inverter in the prior art is easily damaged can be solved by protecting the rectifier bridge and the subsequent circuit.

[0005] The purpose of the utility model can be realized by the following technical solutions:

[0006] An emergency inverter power supply device for ventilation of rail transit vehicles, comprising:

[0007] A detection circuit, including a bridge rectifier circuit, a first voltage division circuit, a comparator and an optocoupler. The input end of the bridge rectifier circuit is connected to the vehicle main circuit power supply through a fuse, and the output end is connected to the first voltage division circuit. One of the voltage division output ends of the first voltage division circuit is connected to the inverting input end of the comparator. The non-inverting input end of the comparator is connected to the first DC reference power supply module, the power input end is connected to the positive pole of the first DC power supply, and the output end is connected to the negative pole of the input end of the optocoupler. The positive pole of the input end of the optocoupler is connected to the positive pole of the first DC power supply;

[0008] A signal processing circuit, with the input end connected to the output end of the optocoupler and the output end connected to the controller;

[0009] A controller, a main relay and an inverter. The output end of the controller is connected to the coil of the main relay, and the contact of the main relay is arranged between the standby power supply and the inverter.

[0010] There are 2 detection circuits provided in total. The signal processing circuit is an OR logic circuit. The two input ends of the OR logic circuit are respectively connected to the output ends of the optocouplers of the two detection circuits, and the output end is connected to the controller.

[0011] The device further includes a synchronous relay and two AC contactors. The synchronous relay includes three groups of contacts. The output end of the controller is connected in series with the coil of the synchronous relay. The normally open end of the first group of contacts of the synchronous relay is connected in series with the coil of one of the AC contactors, the normally open end of the second group of contacts is connected in series with the coil of the other AC contactor, and the normally open end of the third group of contacts is connected in series with the coil of the main relay. The normally closed ends of the two AC contactors are respectively arranged between the fuses in the two detection circuits and the vehicle main circuit power supply.

[0012] The first DC reference power supply module includes a second voltage dividing circuit. The voltage dividing output end of the second voltage dividing circuit is connected to the positive-phase input end of the comparator.

[0013] The second voltage dividing circuit is composed of two fixed-value resistors with equal resistance values connected in series.

[0014] The detection circuit further includes a first discharge resistor and a first discharge diode. The negative pole of the input end of the optocoupler is further connected to the voltage dividing output end of the second voltage dividing circuit through the first discharge resistor and the first discharge diode in sequence.

[0015] A first current limiting resistor is further provided between the positive pole of the input end of the optocoupler and the first DC power supply.

[0016] The detection circuit further includes a filter capacitor. The filter capacitor is arranged at the output end of the bridge rectifier circuit.

[0017] The fuse has a withstand voltage of 500V and a maximum current of 2A.

[0018] The fuse is a ceramic fuse tube.

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

[0020] 1. A fuse is added between the vehicle main circuit power supply and the bridge rectifier circuit, so as to solve the problem that the emergency ventilation inverter is easily damaged in the prior art by protecting the rectifier bridge and the subsequent circuit.

[0021] 2. By configuring two detection circuits and cooperating with OR logic, when there are fluctuations, only one detection circuit needs to output a signal, and then the emergency power supply scheme can be switched, improving stability.

[0022] 3. By means of a synchronous relay and an AC contactor, when switching to emergency power supply, the AC power supply can be disconnected simultaneously, thus effectively protecting the detection circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the present utility model;

[0024] Figure 2 is a schematic circuit principle diagram of the control part;

[0025] Figure 3 is a schematic circuit principle diagram of the detection part;

[0026] Among them: 1. Detection circuit, 2. Backup power supply, 3. Inverter, U2 and U3 are optocouplers, U5 is a controller, K1 is a main relay, K2 is a synchronous relay, KM1 and KM2 are AC contactors, U6 is an OR logic circuit, VCC1 is a first DC power supply, VCC2 is a second DC power supply, and R1 to R3 are current-limiting resistors. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present utility model, and the detailed implementation manners and specific operation processes are given, but the protection scope of the present utility model is not limited to the following embodiments.

[0028] A ventilation emergency inverter power supply device for rail transit vehicles, as Figures 1 to 3 shown, includes:

[0029] The detection circuit 1 includes a bridge rectifier circuit, a first voltage division circuit, a comparator and an optocoupler. The input end of the bridge rectifier circuit is connected to the vehicle main circuit power supply through a fuse, the output end is connected to the first voltage division circuit, one of the voltage division output ends of the first voltage division circuit is connected to the inverting input end of the comparator, the non-inverting input end of the comparator is connected to the first DC reference power supply module, the power input end is connected to the positive pole of the first DC power supply VCC1, and the output end is connected to the negative pole of the input end of the optocoupler. The positive pole of the input end of the optocoupler is connected to the positive pole of the first DC power supply VCC1;

[0030] The signal processing circuit has its input end connected to the output end of the optocoupler and its output end connected to the controller U5;

[0031] The controller U5, the main relay K1 and the inverter 3. The output end of the controller U5 is connected to the coil of the main relay K1, and the contact of the main relay K1 is arranged between the backup power supply 2 and the inverter 3.

[0032] Add a fuse between the main circuit power supply of the vehicle and the bridge rectifier circuit, so as to solve the problem that the emergency ventilation inverter 3 is easily damaged in the prior art by protecting the rectifier bridge and the subsequent circuit.

[0033] In this embodiment, there are 2 detection circuits 1 in total. The signal processing circuit is an OR logic circuit U6. The two input terminals of the OR logic circuit U6 are respectively connected to the output terminals of the optocouplers of the two detection circuits 1, and the output terminal is connected to the controller U5. By configuring two detection circuits 1 and cooperating with the OR logic, when there is a fluctuation, only one detection circuit 1 needs to output a signal, and then the emergency power supply scheme can be switched, improving the stability.

[0034] In addition, in this embodiment, the first DC reference power supply module includes a second voltage dividing circuit. The voltage dividing output terminal of the second voltage dividing circuit is connected to the positive phase input terminal of the comparator, and the second voltage dividing circuit is composed of two fixed resistors with equal resistance values connected in series.

[0035] The detection circuit 1 further includes a first discharge resistor and a first discharge diode. The negative electrode of the input terminal of the optocoupler is also sequentially connected to the voltage dividing output terminal of the second voltage dividing circuit through the first discharge resistor and the first discharge diode.

[0036] In addition, a first current limiting resistor is also provided between the positive electrode of the input terminal of the optocoupler and the first DC power supply VCC1. Generally, the detection circuit 1 further includes a filter capacitor, and the filter capacitor is provided at the output terminal of the bridge rectifier circuit.

[0037] The fuse has a withstand voltage of 500V and a maximum current of 2A, and the material is a ceramic fuse tube.

[0038] Such as Figure 3As shown, in this embodiment, the comparator uses LM393, which integrates two comparators. Among them, pin 2 is the inverting input terminal of the first comparator, pin 3 is the non-inverting input terminal of the first comparator, pins 6 and 5 are the inverting input terminal and the non-inverting input terminal of the second comparator respectively, pin 8 is the positive power supply terminal, pin 4 is the negative power supply terminal, pin 1 is the output terminal of the first comparator, and pin 7 is the output terminal of the second comparator. When the vehicle main circuit power supply works normally, after being rectified by the bridge rectifier circuit, the output voltage is divided and used as the input of the inverting input terminal of the comparator. Since the input of the non-inverting input terminal of the comparator is a voltage less than 5V, at this time, because the input voltage of the inverting input terminal is greater than the input voltage of the non-inverting input terminal, and since LM393 is a comparator with open-drain output or open-collector (OC) output, when the output is not activated, the output pin is floating (i.e., in a high-impedance state, not directly connected to the power supply or ground). When the voltage of pin 2 is greater than the voltage of pin 3, the condition of the comparator is not met. Therefore, pin 1 (output 1) will not be activated but is in a floating state. However, since pin 8 (Vcc) is connected to the positive pole of the first DC power supply VCC1, and pin 1 is an open-drain output, usually a pull-up resistor is used to connect pin 1 to the positive pole of the first DC power supply VCC1, and the output is 5V. At this time, the output of the optocoupler is at a low level, and both optocouplers are at a low level. At this time, the main relay K1 does not work. When any one of the detection circuits 1 is abnormal, the output of the corresponding comparator is 0. At this time, the output of the optocoupler is at a high level, that is, it triggers the controller U5 to act.

[0039] In this embodiment, as Figure 2 shown, the device further includes a synchronous relay K2 and two AC contactors. The synchronous relay K2 includes three groups of contacts. The output terminal of the controller U5 is connected in series with the coil of the synchronous relay K2. The normally open end of the first group of contacts of the synchronous relay K2 is connected in series with the coil of one of the AC contactors, the normally open end of the second group of contacts is connected in series with the coil of the other AC contactor, and the normally open end of the third group of contacts is connected in series with the coil of the main relay K1. The normally closed ends of the two AC contactors are respectively arranged between the fuses in the two detection circuits 1 and the vehicle main circuit power supply.

[0040] Through the synchronous relay K2 and the AC contactors, it can be realized that when switching to emergency power supply, the AC power supply is disconnected at the same time, so that the detection circuit 1 can be effectively protected.

[0041] When the input terminal of the controller U5 receives a high level, the output terminal of the controller U5 outputs a high level. At this time, the coil of the synchronous relay K2 is turned on, and the three groups of contacts are simultaneously attracted. The coils of the two AC contactors and the main relay K1 are simultaneously turned on, so as to disconnect the connection between the two detection circuits 1 and the vehicle main circuit power supply, and conduct the connection between the backup power supply 2 and the inverter 3. Figure 2 The voltage of the second DC power supply VCC2 in

Claims

1. A rail transit vehicle ventilation emergency inverter power supply device, characterized in that: include: A detection circuit, comprising a bridge rectifier circuit, a first voltage divider circuit, a comparator and an optocoupler, wherein the input end of the bridge rectifier circuit is connected to the vehicle main circuit power supply through a fuse, the output end is connected to the first voltage divider circuit, the voltage divider output end of the first voltage divider circuit is connected to one of the inverting input ends of the comparator, the non-inverting input end of the comparator is connected to a first DC reference power supply module, the power supply input end is connected to the positive electrode of the first DC power supply, the output end is connected to the negative electrode of the input end of the optocoupler, and the positive electrode of the input end of the optocoupler is connected to the positive electrode of the first DC power supply; A signal processing circuit, the input end of which is connected to the output end of the optical coupler, and the output end of which is connected to the controller; A controller, a main relay and an inverter, wherein the output end of the controller is connected to the coil of the main relay, and the contact of the main relay is arranged between the backup power supply and the inverter.

2. The rail transit vehicle ventilation emergency inverter power supply equipment according to claim 1, characterized in that: There are two detection circuits in total. The signal processing circuit is an OR logic circuit. The two input ends of the OR logic circuit are respectively connected to the output ends of the optocouplers of the two detection circuits, and the output end is connected to the controller.

3. The rail transit vehicle ventilation emergency inverter power supply equipment according to claim 2, characterized in that: The device also includes a synchronous relay and two AC contactors, the synchronous relay includes three groups of contacts, the output end of the controller is connected in series with the coil of the synchronous relay, the normally open end of the first group of contacts of the synchronous relay is connected in series with the coil of one of the AC contactors, the normally open end of the second group of contacts is connected in series with the coil of the other AC contactor, the normally open end of the third group of contacts is connected in series with the coil of the main relay, and the normally closed ends of the two AC contactors are respectively arranged between the fuses in the two detection circuits and the vehicle main circuit power supply.

4. The rail transit vehicle ventilation emergency inverter power supply equipment according to claim 1, characterized in that: The first DC reference power supply module includes a second voltage divider circuit, and a voltage divider output terminal of the second voltage divider circuit is connected to the non-inverting input terminal of the comparator.

5. The rail transit vehicle ventilation emergency inverter power supply equipment according to claim 4, characterized in that: The second voltage-dividing circuit is composed of two fixed resistors with equal resistance connected in series.

6. The rail transit vehicle ventilation emergency inverter power supply equipment according to claim 4, characterized in that: The detection circuit also includes a first discharge resistor and a first discharge diode, and the negative electrode of the input end of the optocoupler is also connected to the voltage divider output end of the second voltage divider circuit through the first discharge resistor and the first discharge diode in sequence.

7. The rail transit vehicle ventilation emergency inverter power supply equipment according to claim 1, characterized in that: A first current limiting resistor is also provided between the positive electrode of the input end of the optical coupler and the first DC power supply.

8. The rail transit vehicle ventilation emergency inverter power supply equipment according to claim 1, characterized in that: The detection circuit also includes a filter capacitor, which is arranged at the output end of the bridge rectifier circuit.

9. The rail transit vehicle ventilation emergency inverter power supply equipment according to claim 1, characterized in that: The fuse has a withstand voltage of 500V and a maximum current of 2A.

10. The rail transit vehicle ventilation emergency inverter power supply equipment according to claim 1, characterized in that: The fuse is a ceramic fuse tube.

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