Urban rail vehicle-mounted air conditioner compressor frequency converter

Abstract

The utility model belongs to the field of urban rail vehicle-mounted air-conditioning systems, and discloses an urban rail vehicle-mounted air-conditioning compressor frequency converter. Comprising an EMC circuit, a PFCSiC rectifying circuit, a three-phase inverter circuit, an internal sampling circuit, an AC380V input interface, a variable-frequency variable-voltage adjustable power supply output interface, a control interface, an address interface, a communication interface and a temperature sensor interface, after an address is set by using the address interface, a starting signal from an upper-level device is received and runs, the temperature of a compartment sensed by the temperature sensor is collected in real time, and after the PFCSiC rectifying circuit rectifies an AC380V input power supply and corrects a power factor, the AC380V input power supply is inverted and converted into an output alternating current power supply with adjustable voltage and frequency. In conclusion, the current harmonic content of the input end of the executing device compressor can be reduced, the working efficiency of the urban rail air conditioner compressor is improved, the three-phase power supply has the characteristics of safety, stability, controllability and the like, and a controllable and stable three-phase power supply is provided for vehicle-mounted air conditioning equipment.

Description

Technical Field

[0001] The utility model relates to the field of urban rail vehicle-mounted air-conditioning systems, and more specifically, to an urban rail vehicle-mounted air-conditioning compressor inverter. Background Art

[0002] Urban rail vehicles refer to electric vehicles specially used in urban rail transit systems, including subways, light rails, trams, etc. They are public transportation vehicles running on railways, tracks or underground passages for transporting passengers and goods. Urban rail vehicles are usually composed of multiple carriages, with high passenger capacity and fast running speed. Urban rail vehicles are of great significance to urban traffic congestion and environmental protection, and can provide efficient, convenient and environmentally friendly public transportation services.

[0003] In order to ensure the comfort of passengers on urban rail vehicles, air conditioning systems are installed in the carriages. When using a fixed-frequency air conditioning compressor, when the air conditioning system is turned on, the speed of the fixed-frequency air conditioning compressor does not change, and the compartment temperature cannot be adjusted automatically. The compartment temperature can only be adjusted by continuously starting or stopping the air conditioning compressor to start or stop. The time from starting to the set temperature is long, so the temperature difference in the compartment of the urban rail vehicle changes greatly during the start-stop, resulting in a decrease in the working efficiency of the air conditioning system, resulting in relatively large power consumption, which is not in line with the national policy direction of energy conservation and emission reduction, and also affects the service life of the air conditioning unit compressor. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings existing in the prior art, and to propose an urban rail vehicle-mounted air-conditioning compressor inverter to solve the technical problems in the prior art of frequent starting of the air-conditioning compressor, inability to automatically adjust the compressor speed, low efficiency, high energy consumption, and inability to improve passenger comfort.

[0005] To solve the above problems, the utility model adopts the following technical solutions.

[0006] An urban rail vehicle air conditioning compressor inverter, comprising an EMC circuit, a PFC_SiC rectifier circuit and a three-phase inverter circuit, an internal sampling circuit, and an AC380V input interface, a variable frequency and variable voltage adjustable power supply output interface, a control interface, an address interface, a communication interface, and a temperature sensor interface arranged on a housing sealing structure, wherein the PFC_SiC rectifier circuit is controlled by an MCU processor 1, and the three-phase inverter circuit is controlled by an MCU processor 2;

[0007] The input end of the EMC circuit is connected to the input interface, the output end of the EMC circuit is connected to the PFC_SiC rectifier circuit, the output end of the PFC_SiC rectifier circuit is connected to the three-phase inverter circuit, and the output end of the three-phase inverter circuit is connected to the output interface;

[0008] The AC380V input interface is connected to the three-phase AC380V voltage from the outside, the AC380V input interface is used to output an adjustable voltage with variable frequency square wave to drive the compressor, the control interface is connected to the start signal from the upper-level device, the address interface is used to set the local address setting switch, the communication interface is used to communicate with the upper-level device, and the temperature sensor interface is used to collect the temperature sensor of the air-conditioning unit;

[0009] The three-phase AC380V voltage from the outside enters the EMC circuit for filtering, passes through the PFC_Sic rectifier circuit controlled by the MCU processor 1, and then controls the three-phase inverter circuit through the MCU processor 2 to convert the frequency to output a signal with adjustable voltage and adjustable frequency to drive the compressor of the air-conditioning unit.

[0010] As a further description of the above technical solution: the control interface, address interface, communication interface and temperature sensor interface are respectively controlled by the MCU processor 2.

[0011] As a further description of the above technical solution: an input sampling circuit is connected to the output circuit of the EMC circuit.

[0012] As a further description of the above technical solution: a bus voltage sampling module circuit is connected to the output circuit of the PFC_SiC rectifier circuit, and the bus voltage sampling module circuit is used to collect the DC bus voltage value. The bus voltage sampling module circuit includes an isolation amplifier 1 and an inverting amplifier 1.

[0013] As a further description of the above technical solution: the output end of the three-phase inverter circuit is connected to a three-phase output current sampling module circuit, and the three-phase output current sampling module circuit includes an isolation amplifier 2 and an inverting amplifier 2.

[0014] As a further description of the above technical solution: the control interface includes a control interface digital quantity module circuit, the control interface digital quantity module circuit includes a photoelectric coupler, and the photoelectric coupler is used for electrical isolation.

[0015] As a further description of the above technical solution: the temperature sensor interface includes a temperature sensor acquisition module circuit, and the temperature sensor acquisition module circuit includes an acquisition channel, an isolation amplifier 3 and an inverting amplifier 3.

[0016] As a further description of the above technical solution: the communication interface includes a communication circuit, and the communication circuit communication connection connector, a common mode filter, a surge protection circuit and a level conversion chip.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] After the address is set using the address interface, the utility model receives the start signal from the upper-level device (air conditioning system controller) and runs, collects the compartment temperature sensed by the temperature sensor in real time, and the PFC_SiC rectifier circuit rectifies the AC380V input power supply and performs power factor correction, and then inverts and converts it into an output AC power supply with adjustable voltage and frequency. In summary, the utility model can reduce the current harmonic content at the input end of the actuator compressor, improve the working efficiency of the urban rail air conditioning compressor, and has the characteristics of safety, stability, and controllability, providing a controllable and stable three-phase power supply for vehicle-mounted air conditioning equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a principle block diagram of a city rail vehicle air conditioning compressor inverter of the utility model;

[0020] Figure 2 This is a circuit diagram of an EMC filter module for an inverter of an urban rail vehicle air-conditioning compressor of the utility model;

[0021] Figure 3 This is a circuit diagram of a PFC_Sic rectifier module controlled by an MCU processor 1 of an urban rail vehicle air-conditioning compressor inverter of the utility model;

[0022] Figure 4 This is a circuit diagram of a three-phase inverter module controlled by an MCU processor 2 of an urban rail vehicle air-conditioning compressor inverter of the utility model;

[0023] Figure 5 This is a circuit block diagram of a bus voltage acquisition module for an inverter of an urban rail vehicle air-conditioning compressor;

[0024] Figure 6 This is a circuit block diagram of an output phase current acquisition module of an inverter for an urban rail vehicle air-conditioning compressor of the utility model;

[0025] Figure 7 This is a circuit diagram of a digital quantity module for the inverter control interface of an urban rail vehicle air-conditioning compressor of the utility model;

[0026] Figure 8 This is a circuit block diagram of a temperature sensor acquisition module for an inverter of an urban rail vehicle air-conditioning compressor of the utility model;

[0027] Fig. 9 The utility model is a communication circuit block diagram of a frequency converter for an urban rail vehicle air-conditioning compressor. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0029] See also Figure 1 , an inverter for an urban rail vehicle air-conditioning compressor, comprising an EMC circuit, a PFC_SiC rectifier circuit and a three-phase inverter circuit, an internal sampling circuit, and an AC380V input interface, a variable frequency and variable voltage adjustable power supply output interface, a control interface, an address interface, a communication interface and a temperature sensor interface arranged on a housing sealing structure, wherein the control interface, the address interface, the communication interface and the temperature sensor interface are respectively controlled by an MCU processor 2. The PFC_SiC rectifier circuit is controlled by an MCU processor 1, and the three-phase inverter circuit is controlled by an MCU processor 2; the input end of the EMC circuit is connected to the input interface, the output end of the EMC circuit is connected to the PFC_SiC rectifier circuit, the output end of the PFC_SiC rectifier circuit is connected to the three-phase inverter circuit, and the output end of the three-phase inverter circuit is connected to the output interface; the output circuit of the EMC circuit is connected to an input sampling circuit. The AC380V input interface is connected to the three-phase AC380V voltage from the outside, the variable frequency and variable voltage adjustable power supply output interface is used to output variable frequency square wave adjustable voltage to drive the compressor, the control interface is connected to the start signal from the upper level device, the address interface is used to set the local address setting switch, the communication interface is used to communicate with the upper level device, and the temperature sensor interface is used to collect the temperature sensor of the air conditioning unit;

[0030] The address of the air-conditioning compressor inverter is set through the local address setting switch (address interface), and the start signal from the upper-level device (air-conditioning unit main controller) is received through the control interface to start the vehicle compartment temperature sensed by the temperature sensor in real time.

[0031] The compression inverter passes the three-phase AC380V voltage from the outside into the EMC circuit for filtering, and then passes through the PFC_Sic rectifier circuit controlled by the MCU processor 1 to boost the AC380V voltage to a DC650V DC voltage. Finally, the three-phase inverter circuit is controlled by the MCU processor 2 to convert it into a three-phase voltage with adjustable voltage / frequency to drive the air-conditioning system compressor to operate.

[0032] In addition, if Figure 2As shown in the figure, when the EMC module circuit inputs AC380V three-phase voltage and passes through the three-phase common-mode inductor, it passes through the circuit composed of the X capacitor connected between the live wire and the neutral wire for filtering the differential mode signal and the Y capacitor connected across the live wire and the ground and the neutral wire and the ground for filtering the common mode signal, and outputs the filtered AC380V AC signal.

[0033] like Figure 3 As shown, the PFC_Sic rectifier module circuit controlled by the MCU processor 1 inputs a three-phase AC 380V voltage through the PFC boost inductor and enters the six-switch PFC rectifier circuit composed of SiC series diodes. The MCU processor 1 controls the high-speed switch of PFC_Sic to stabilize the output bus voltage "BUS+", and uses the compensation capacitor to consume reactive power, thereby improving the power factor.

[0034] like Figure 4 As shown, MCU processor 2 controls the three-phase inverter module circuit: after the three-phase PFC-SiC rectifier circuit boosts and outputs a stable DC bus voltage, it is modulated by SPWM of MCU processor 2. The control loop has two signal generation sources, one is a fixed-amplitude triangle wave (modulation wave) generator, and the other is a sine wave generator. The triangle wave is used to modulate the sine wave to obtain a square wave pulse train whose duty cycle changes according to the sine law. The square wave pulse train is then used to control the above bridge circuit to obtain the required sinusoidal power supply voltage and current at the output.

[0035] like Figure 5 As shown, a bus voltage sampling module circuit is connected to the output circuit of the PFC_SiC rectifier circuit. The bus voltage sampling module circuit is used to collect the DC bus voltage value. The bus voltage sampling module circuit includes an isolation amplifier 1 and an inverting amplifier 1.

[0036] The DC voltage BUS+ output by the PFC rectifier circuit is sampled through resistor voltage division. In order to accurately collect data, an isolation amplifier 1 is used to prevent the data acquisition device from being affected by the potentially destructive voltage of the remote sensor. After being amplified by the inverting amplifier 1, the specific value is fed back to the chip for collection.

[0037] like Figure 6 As shown, the output end of the three-phase inverter circuit is connected to a three-phase output current sampling module circuit, and the three-phase output current sampling module circuit includes an isolation amplifier 2 and an inverting amplifier 2.

[0038] When outputting voltage, an isolation amplifier 2 is used to reduce interference when collecting data. In order to reduce the power consumption of the sampling resistor, the resistance of the sampling resistor is generally very small, so the voltage difference across the two ends is also very small. Therefore, an inverting amplifier 2 is used to amplify the collected value and feed it back to the chip for current collection.

[0039] like Figure 7 As shown, the control interface includes a control interface digital quantity module circuit, and the control interface digital quantity module circuit includes a photoelectric coupler, and the photoelectric coupler is used for electrical isolation.

[0040] The module circuit uses the electrical isolation function of the photocoupler. When the light-emitting diode on the left is turned on, the transistor on the right is turned on. In this process, the signals on both sides are completely isolated, which plays a role of non-interference, ensuring that the control signal can be fed back to the chip normally.

[0041] like Figure 8 As shown, the temperature sensor interface includes a temperature sensor acquisition module circuit, and the temperature sensor acquisition module circuit includes an acquisition channel, an isolation amplifier 3 and an inverting amplifier 3.

[0042] The acquisition module circuit is powered by an external 0-10V. The acquisition mode is selected by selecting the acquisition channel. The role of the isolation amplifier 3 is to prevent the data acquisition device from being affected by the potentially destructive voltage of the remote sensor, and to eliminate the measurement error caused by the ground loop to ensure the accuracy of the acquisition. The corresponding multiple is amplified by the inverting amplifier 3 and used to feed back to the chip to receive the collected voltage value.

[0043] like Fig. 9 As shown, the communication interface includes a communication circuit, a communication circuit communication connection connector, a common mode filter, a surge protection circuit and a level conversion chip.

[0044] The communication data from the upper-level device is converted into a level acceptable to the MCU processor through the connector, common mode filter, surge protection circuit and level conversion chip, and the communication data is processed through the communication protocol inside the MCU processor.

[0045] The above is only a preferred specific implementation of the utility model; however, the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and improved ideas of the utility model within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model.

Claims

1. An inverter for an air-conditioning compressor on a city rail vehicle, characterized in that: It includes an EMC circuit, a PFC_SiC rectifier circuit and a three-phase inverter circuit, an internal sampling circuit, and an AC380V input interface, a variable frequency and variable voltage adjustable power supply output interface, a control interface, an address interface, a communication interface, and a temperature sensor interface arranged on the housing sealing structure. The PFC_SiC rectifier circuit is controlled by an MCU processor 1, and the three-phase inverter circuit is controlled by an MCU processor 2; The input end of the EMC circuit is connected to the input interface, the output end of the EMC circuit is connected to the PFC_SiC rectifier circuit, the output end of the PFC_SiC rectifier circuit is connected to the three-phase inverter circuit, and the output end of the three-phase inverter circuit is connected to the output interface; The AC380V input interface is connected to the three-phase AC380V voltage from the outside, the AC380V input interface is used to output an adjustable voltage with variable frequency square wave to drive the compressor, the control interface is connected to the start signal from the upper-level device, the address interface is used to set the local address setting switch, the communication interface is used to communicate with the upper-level device, and the temperature sensor interface is used to collect the temperature sensor of the air-conditioning unit; The three-phase AC380V voltage from the outside enters the EMC circuit for filtering, passes through the PFC_Sic rectifier circuit controlled by the MCU processor 1, and then controls the three-phase inverter circuit through the MCU processor 2 to convert the frequency to output a signal with adjustable voltage and adjustable frequency to drive the compressor of the air-conditioning unit.

2. The urban rail vehicle air conditioning compressor inverter according to claim 1, characterized in that: The control interface, address interface, communication interface and temperature sensor interface are controlled by the MCU processor 2 respectively.

3. The urban rail vehicle air conditioning compressor inverter according to claim 1, characterized in that: The output circuit of the EMC circuit is connected to an input sampling circuit.

4. The urban rail vehicle air conditioning compressor inverter according to claim 1, characterized in that: A bus voltage sampling module circuit is connected to the output circuit of the PFC_SiC rectifier circuit. The bus voltage sampling module circuit is used to collect the DC bus voltage value. The bus voltage sampling module circuit includes an isolation amplifier 1 and an inverting amplifier 1.

5. The urban rail vehicle air conditioning compressor inverter according to claim 1, characterized in that: The output end of the three-phase inverter circuit is connected to a three-phase output current sampling module circuit, and the three-phase output current sampling module circuit includes an isolation amplifier 2 and an inverting amplifier 2.

6. The urban rail vehicle air conditioning compressor inverter according to claim 1, characterized in that: The control interface includes a control interface digital quantity module circuit, and the control interface digital quantity module circuit includes a photoelectric coupler, and the photoelectric coupler is used for electrical isolation.

7. The urban rail vehicle air conditioning compressor inverter according to claim 1, characterized in that: The temperature sensor interface includes a temperature sensor acquisition module circuit, and the temperature sensor acquisition module circuit includes an acquisition channel, an isolation amplifier 3 and an inverting amplifier 3 .

8. The urban rail vehicle air conditioning compressor inverter according to claim 1, characterized in that: The communication interface comprises a communication circuit, and the communication circuit comprises a communication connection connector, a common mode filter, a surge protection circuit and a level conversion chip.

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