Vehicle-mounted frequency conversion equipment, vehicle-mounted air conditioner and railway vehicle
By designing on-board frequency conversion equipment that is isolated from shared DC bus and modules, the problem of high production and maintenance costs of on-board air conditioners of different power supply models is solved, and the equipment is miniaturized and universalized.
Patent Information
- Application Number
- CN202421640116.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-11
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-07-11
AI Technical Summary
The existing vehicle air conditioners need to design, produce and maintain different vehicle frequency conversion equipment due to different power supply models, resulting in high production and maintenance costs and large equipment size.
Design a vehicle-mounted frequency conversion device, including a current adjustment module, a compressor frequency conversion module, a boost module and a fan inverter module, and achieve compatibility of different power supply models by using a common DC bus and the isolation between the module, and use one frequency converter to drive multiple motors.
It reduces the production and maintenance costs of on-board air conditioners, reduces the equipment volume, and improves versatility to meet the needs of a variety of power supply models.
Smart Images
Figure CN223182030U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of air conditioners, and particularly to a vehicle-mounted frequency conversion device, a vehicle-mounted air conditioner, and a rail vehicle. Background Art
[0002] According to the power supply methods of vehicle-mounted air conditioners, rail transit vehicles can generally be divided into AC-powered vehicle models and medium-voltage DC-powered vehicle models. For example, most of the vehicle-mounted air conditioners on high-speed trains and subways use AC power supply, which are AC-powered vehicle models, while most of the power-concentrated multiple units use medium-voltage DC power supply, which are medium-voltage DC-powered vehicle models.
[0003] Currently, each unit of a vehicle-mounted air conditioner generally has three types of motors: a compressor, a condenser fan, and a ventilation fan. However, for the vehicle-mounted air conditioners installed in AC-powered vehicle models, due to the overly large volume of the vehicle-mounted frequency conversion device and the high production cost, and moreover, the vehicle-mounted frequency conversion devices used in different power supply vehicle models are not compatible with each other. This leads to the need to design, produce, and maintain different vehicle-mounted frequency conversion devices when installing vehicle-mounted air conditioners for vehicle models with different power supply methods, increasing the production cost and maintenance cost of the vehicle-mounted air conditioner. Summary of the Utility Model
[0004] Based on this, it is necessary to provide a vehicle-mounted frequency conversion device, a vehicle-mounted air conditioner, and a rail vehicle that can reduce production costs and maintenance costs for the above technical problems.
[0005] In a first aspect, this application provides a vehicle-mounted frequency conversion device, including a current adjustment module, a compressor frequency conversion module, a boost module, and a fan inverter module;
[0006] The DC side of the current adjustment module is connected to the DC side of the compressor frequency conversion module and the DC side of the fan inverter module; the AC side of the compressor frequency conversion module is connected to the compressor; the AC side of the fan inverter module is connected to the ventilation fan.
[0007] The input end of the boost module is connected to a low-voltage DC power supply; the output end of the boost module is connected to the DC side of the fan inverter module.
[0008] In one embodiment, the DC side of the current adjustment module is connected to the DC side of the compressor frequency conversion module through a first bus pair; the output end of the boost module is connected to the DC side of the fan inverter module through a second bus pair; the first negative bus in the first bus pair is connected to the second negative bus in the second bus pair; the first positive bus in the first bus pair is connected to the second positive bus in the second bus pair through an isolation module.
[0009] In one embodiment, the isolation module includes an isolation unit and an overcurrent protection unit; the input end of the isolation unit is connected to the first positive bus, and the output end of the isolation unit is connected to the second positive bus through the overcurrent protection unit.
[0010] In one embodiment, the on-vehicle frequency conversion device further includes a DC filtering module and a DC input contactor; the input end of the boost module is sequentially connected to the low-voltage DC power supply through the DC filtering module and the DC input contactor.
[0011] In one embodiment, the AC side of the current adjustment module is connected to a first AC power supply or a condensing fan.
[0012] In a second aspect, the present application further provides an on-vehicle air conditioner, which is applied to an AC-powered vehicle model. The device includes: the on-vehicle air conditioner includes a compressor, a ventilation fan, a condensing fan, and the on-vehicle frequency conversion device according to any one of the above embodiments;
[0013] The AC side of the current adjustment module in the on-vehicle frequency conversion device is connected to a first AC power supply;
[0014] The condensing fan is connected to a second AC power supply.
[0015] In one embodiment, the on-vehicle air conditioner further includes a first AC input contactor and an AC filtering module;
[0016] The current adjustment module is sequentially connected to the first AC power supply through the AC filtering module and the first AC input contactor.
[0017] In one embodiment, the on-vehicle air conditioner further includes a second AC input contactor; the condensing fan is connected to the second AC power supply through the second AC input contactor.
[0018] In one embodiment, the on-vehicle air conditioner further includes a third AC input contactor and a fourth AC input contactor;
[0019] The AC side of the fan inverter module in the on-vehicle frequency conversion device is connected to the ventilation fan through the third AC input contactor;
[0020] The ventilation fan is also connected to the first AC power supply through the fourth AC input contactor.
[0021] In a third aspect, the present application further provides an on-vehicle air conditioner, which is applied to a medium-voltage DC-powered vehicle model. The on-vehicle air conditioner includes a compressor, a ventilation fan, a condensing fan, and the on-vehicle frequency conversion device according to any one of the above embodiments;
[0022] The AC side of the current adjustment module in the vehicle-mounted frequency conversion device is connected to the condensation fan;
[0023] The DC side of the current adjustment module, the DC side of the compressor frequency conversion module in the vehicle-mounted frequency conversion device, and the DC side of the fan inverter module in the vehicle-mounted frequency conversion device are respectively connected to a medium-voltage DC power supply.
[0024] In one embodiment, the vehicle-mounted air conditioner further includes a pre-charge module;
[0025] The DC side of the current adjustment module, the DC side of the compressor frequency conversion module, and the DC side of the fan inverter module are respectively connected to the medium-voltage DC power supply through the pre-charge module.
[0026] In a fourth aspect, the present application further provides a rail vehicle, which includes the above-mentioned vehicle-mounted air conditioner.
[0027] For the above-mentioned vehicle-mounted frequency conversion device, vehicle-mounted air conditioner and rail vehicle, by connecting the DC side of the current adjustment module to the DC side of the compressor frequency conversion module and the DC side of the fan inverter module respectively, connecting the AC side of the compressor frequency conversion module to the compressor, and connecting the AC side of the fan inverter module to the ventilation fan, when the AC power supply of the AC power supply vehicle is normal, the current adjustment module can directly rectify the compressor frequency conversion module and the fan inverter module, which can effectively reduce the equipment volume of the vehicle-mounted air conditioner in the AC power supply vehicle and reduce the production cost. In addition, by connecting the input end of the boost module to the low-voltage DC power supply and the output end to the DC side of the fan inverter module, when the AC power supply vehicle cannot supply power normally, the low-voltage DC power supply can directly supply power to the ventilation fan. When the vehicle type is a medium-voltage DC vehicle type, only the AC side of the current adjustment module needs to be connected to the condensation fan, and the DC sides of the current adjustment module, the compressor frequency conversion module, and the fan inverter module are respectively connected to the medium-voltage DC power supply, and the air conditioner can be used normally. It can be seen that the above-mentioned vehicle-mounted frequency conversion device including the current adjustment module, compressor frequency conversion module, boost module, and fan inverter module can be regarded as a vehicle-mounted frequency conversion all-in-one machine. Only one frequency converter can drive multiple motors, such as ventilation fans, compressors, condensation fans, etc. While being able to adapt to various structures of the vehicle-mounted air conditioner in the rail vehicle, it effectively reduces the equipment volume of the vehicle-mounted frequency conversion device, realizes power supply compatibility for different power supply vehicle types through one frequency conversion device, reduces the production cost and maintenance cost of the vehicle-mounted air conditioner, and improves the versatility of the integrated vehicle-mounted frequency conversion device in the vehicle-mounted air conditioner of the rail vehicle. Description of the Drawings
[0028] Figure 1 It is a schematic structural diagram of a vehicle-mounted frequency conversion device in one embodiment;
[0029] Figure 2 Schematic diagram of the circuit topology of the current adjustment module in one embodiment;
[0030] Figure 3 Schematic diagram of the structure of an on-vehicle frequency conversion device in another embodiment;
[0031] Figure 4 Schematic diagram of the structure of an on-vehicle frequency conversion device in another embodiment;
[0032] Figure 5 Schematic diagram of the structure of an on-vehicle air conditioner applied to an AC-powered vehicle model in one embodiment;
[0033] Figure 6 Schematic diagram of the structure of an on-vehicle air conditioner applied to an AC-powered vehicle model in another embodiment;
[0034] Figure 7 Schematic diagram of the structure of an on-vehicle air conditioner applied to an AC-powered vehicle model in another embodiment;
[0035] Figure 8 Schematic diagram of the structure of an on-vehicle air conditioner applied to a medium-voltage DC-powered vehicle model in one embodiment;
[0036] Figure 9 Schematic diagram of the structure of an on-vehicle air conditioner applied to a medium-voltage DC-powered vehicle model in one embodiment;
[0037] Figure 10 Schematic diagram of the structure of an on-vehicle air conditioner applied to a medium-voltage DC-powered vehicle model in one embodiment. Detailed implementation manners
[0038] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.
[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of this application in this specification are only for the purpose of describing specific embodiments and are not intended to limit this application.
[0040] It will be understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.
[0041] It will be understood that "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if there is transmission of electrical signals or data between the connected circuits, modules, units, etc.
[0042] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprise / include" or "have" etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.
[0043] In one embodiment, as Figure 1 shown, a vehicle-mounted frequency conversion device 100 is provided, including a current adjustment module 101, a compressor frequency conversion module 102, a boost module 103 and a fan inverter module 104.
[0044] Among them, the DC side of the current adjustment module 101 is connected to the DC side of the compressor frequency conversion module 102 and the DC side of the fan inverter module 104. The AC side of the compressor frequency conversion module 102 is connected to the compressor 201, and the AC side of the fan inverter module 104 is connected to the ventilation fan 202. The input end of the boost module 103 is connected to the low-voltage DC power supply 303, and the output end of the boost module 103 is connected to the DC side of the fan inverter module 104.
[0045] In one of the embodiments, the voltage range of the low-voltage current output by the low-voltage DC power supply can be 77~137.5V.
[0046] Among them, the current adjustment module 101 is a module for changing the nature of the current. The current adjustment module 101 can simultaneously have a rectification function and an inversion function. Among them, the rectification function refers to the current adjustment function of converting the positive and negative alternating voltage into a unidirectional pulse voltage by using the one-way conductivity of the diode, so that the alternating current is converted into direct current. The inversion function corresponds to the rectification function and refers to the current adjustment function of reversely converting the unidirectional pulse voltage into an alternating voltage with positive and negative changes, so that the direct current becomes alternating current. In one of the embodiments, the circuit topology of the current adjustment module 101 is as Figure 2as shown
[0047] The compressor frequency conversion module 102 can also be called the compressor inverter module, and its function is to invert the direct current output by the current adjustment module 101 into an alternating current with adjustable frequency to achieve the effect of frequency conversion. It can be understood that the compressor frequency conversion module 102 can be any electronic device capable of realizing the inversion function, such as a single-phase inverter, a three-phase inverter, a series inverter, a parallel inverter, a half-bridge inverter, a full-bridge inverter, etc.
[0048] The boost module 103 is a voltage conversion module used to convert a low-value alternating voltage into a higher-value alternating voltage of the same frequency. The input end of the boost module 103 is connected to the low-voltage DC power supply 303. When in use, the boost module 103 can boost the low-voltage direct current output by the low-voltage DC power supply 303, convert it into high-voltage direct current, and input it into the fan inverter module 104 through the DC side connected to the output end of the boost module 103. It can be understood that the boost module 103 can be any boost transformer with a boost voltage conversion function.
[0049] The fan inverter module 104 is a current adjustment module with an inversion function, which is used to invert the high-voltage direct current output after boosting by the boost module 103 into an alternating current to provide working current for the ventilation fan 202 connected to the AC side of the fan inverter module 104. Similarly, the fan inverter module 104 can be any electronic device capable of realizing the inversion function, such as a single-phase inverter, a three-phase inverter, a series inverter, a parallel inverter, a half-bridge inverter, a full-bridge inverter, etc.
[0050] Specifically, the on-vehicle frequency conversion device provided in this embodiment can achieve power supply compatibility for different power supply vehicle models. For example, in the case where the power supply vehicle model is an AC power supply vehicle model, if the AC power supply of the AC power supply vehicle model is normal, the current adjustment module 101 can directly rectify the compressor 201 frequency conversion module 102 and the fan inverter module 104. The DC side of the compressor 201 frequency conversion module 102 can receive the direct current rectified by the current adjustment module 101. After inverting the direct current, it forms an alternating current with adjustable frequency and inputs it into the compressor 201 connected to the AC side of the compressor 201 frequency conversion module 102 to supply power to the compressor 201. Similarly, the DC side of the fan inverter module 104 can also receive the direct current rectified by the current adjustment module 101. After inverting the direct current, it forms an alternating current with adjustable frequency and inputs it into the ventilation fan 202 connected to the AC side of the fan inverter module 104 to supply power to the ventilation fan 202.
[0051] If there is an AC power supply failure in the AC power supply vehicle model, the boost module 103 connected to the low-voltage DC power supply 303 can boost the low-voltage direct current provided by the low-voltage DC power supply 303 to obtain high-voltage direct current, and then output the high-voltage direct current to the fan inverter module 104 through the output terminal. After receiving the high-voltage direct current on the DC side of the fan inverter module 104, the fan inverter module 104 can perform an inversion process on the high-voltage direct current to form an alternating current with adjustable frequency and input it to the ventilation fan 202 connected to the AC side of the fan inverter module 104 to supply power to the ventilation fan 202 and ensure the ventilation of the environment.
[0052] In some embodiments, the voltage range of the high-voltage direct current can be 500~660V.
[0053] In the case where the power supply vehicle model is a medium-voltage DC power supply vehicle model, the AC side of the current rectification module can be directly connected to the condensation fan, and the DC sides of the current rectification module 101, the compressor frequency conversion module 102, and the fan inverter module 104 can be respectively connected to the medium-voltage DC power supply, and the air conditioner of the medium-voltage DC power supply vehicle model can be used normally. It should be noted that the voltage level of the current output by the medium-voltage DC power supply in this embodiment is similar to the level of the current output by the AC power supply.
[0054] In one of the embodiments, the voltage range of the alternating current output by the AC power supply can be 342~440V, and the voltage range of the direct current output by the medium-voltage DC power supply can be 500~660V, that is, the direct current output by the medium-voltage DC power supply can actually be considered as direct current in the high-voltage range.
[0055] The on-vehicle variable-frequency device in the above embodiments connects the DC side of the current adjustment module to the DC sides of the compressor variable-frequency module and the fan inverter module respectively, connects the AC side of the compressor variable-frequency module to the compressor, and connects the AC side of the fan inverter module to the ventilation fan. When the AC power supply of the AC-powered vehicle is normal, the current adjustment module can directly rectify the compressor variable-frequency module and the fan inverter module, which can effectively reduce the equipment size of the on-vehicle air conditioner in the AC-powered vehicle and reduce the production cost. In addition, by connecting the input end of the boost module to the low-voltage DC power supply and the output end to the DC side of the fan inverter module, when the AC-powered vehicle cannot supply power normally, the low-voltage DC power supply can directly supply power to the ventilation fan. When the vehicle type is a medium-voltage DC vehicle, only the AC side of the current adjustment module needs to be connected to the condensing fan, and the DC sides of the current adjustment module, the compressor variable-frequency module, and the fan inverter module are respectively connected to the medium-voltage DC power supply, and the air conditioner can be used normally. It can be seen that the above on-vehicle variable-frequency device including the current adjustment module, the compressor variable-frequency module, the boost module, and the fan inverter module can be regarded as an on-vehicle variable-frequency integrated machine. Only one frequency converter can drive multiple motors, such as ventilation fans, compressors, condensing fans, etc. While being able to adapt to various structures of on-vehicle air conditioners in rail vehicles, it effectively reduces the equipment volume of the on-vehicle variable-frequency device, realizes power supply compatibility for different power supply vehicle types through one variable-frequency device, reduces the production cost and maintenance cost of the on-vehicle air conditioner, and improves the versatility of the integrated on-vehicle variable-frequency device in the on-vehicle air conditioner of rail vehicles.
[0056] In one embodiment, as Figure 3 shown, in the on-vehicle variable-frequency device 100, the DC side of the current adjustment module 101 is connected to the DC side of the compressor variable-frequency module 102 through the first bus pair 105; the output end of the boost module 103 is connected to the DC side of the fan inverter module 104 through the second bus pair 106; the first negative bus 1051 in the first bus pair 105 is connected to the second negative bus 1061 in the second bus pair 106; the first positive bus 1052 in the first bus pair 105 is connected to the second positive bus 1062 in the second bus pair 106 through the isolation module 107.
[0057] Among them, the bus pair constitutes a DC bus for connecting each module, generally including a positive bus and a negative bus. The positive bus is the positive part of the system and usually connects to the positive pole of the power supply, and can connect the positive pole of the power supply to the circuit or equipment that requires a positive voltage. The negative bus is the negative part of the system and usually connects to the negative pole of the power supply, and can connect the negative pole of the power supply to the circuit or equipment that requires a negative voltage or returns current.
[0058] The isolation module 107 is composed of electronic devices with unidirectional conductivity and is used to prevent the current at the output end of the boost module 103 from flowing into the compressor variable-frequency module 102. By connecting the first positive bus 1052 in the first bus pair 105 and the second positive bus 1062 in the second bus pair 106 through the isolation module 107, the current can only flow from the first positive bus 1052 to the second positive bus 1062 and cannot return from the second positive bus 1062 to flow back to the first positive bus 1052.
[0059] Specifically, by connecting the first bus pair 105 between the current adjustment module 101 and the compressor variable-frequency module 102 to the second bus pair 106 between the boost module 103 and the fan inverter module 104, that is, connecting the first positive bus 1052 to the second positive bus 1062 and the first negative bus 1051 to the second negative bus 1061, the compressor variable-frequency module 102 and the fan inverter module 104 can share a DC bus, achieving the purpose of rectifying the current adjustment module 101 for the compressor variable-frequency module 102 and the fan variable-frequency module 104.
[0060] When the vehicle cannot be normally powered, the low-voltage DC power supply 301 needs to be used as the power supply to supply power to the ventilation fan 202. To prevent the direct current boosted by the boost module 103 from flowing into the compressor variable-frequency module 102 through the shared DC bus, an isolation module 107 with unidirectional conductivity can be set on the connection line between the first positive bus 1052 and the second positive bus 1062 to isolate the current channel from the boost module 103 to the compressor variable-frequency module 102, realizing the unidirectional conduction of the current, effectively avoiding the electric energy provided by the low-voltage DC power supply 301 from flowing into the compressor 201 during abnormal power supply, causing energy consumption, and improving the operation stability of the vehicle-mounted air conditioner.
[0061] Further, in one embodiment, the isolation module includes an isolation unit and an overcurrent protection unit.
[0062] Specifically, the input end of the overcurrent protection unit is connected to the first positive bus, and the output end of the overcurrent protection unit is connected to the second positive bus through the isolation unit.
[0063] In one embodiment, the isolation unit can be composed of a one-way diode.
[0064] In one embodiment, the overcurrent protection unit can be composed of a fuse.
[0065] In this embodiment, by setting an isolation unit and an overcurrent protection unit on the connection route between the first positive bus and the second positive bus, not only can the unidirectional conduction of the current be realized, but also the circuit protection can be triggered when the current value flowing through the connection route exceeds the preset safety value, effectively improving the operation stability of the entire device and ensuring the operation safety of the vehicle-mounted air conditioner.
[0066] In one embodiment, the vehicle-mounted variable-frequency device further includes a DC filtering module and a DC input contactor. The input end of the boost module is sequentially connected to the low-voltage DC power supply through the DC filtering module and the DC input contactor.
[0067] The DC input contactor is an electronic device used to connect and disconnect the connection circuit between the low-voltage DC power supply and the boost module. Its function is similar to that of a circuit switch. By setting the DC input contactor between the boost module and the low-voltage DC power supply, the circuit connection between the boost module and the low-voltage DC power supply can be effectively controlled, and it is only turned on when the vehicle cannot be normally powered, which can reduce the energy consumption of the low-voltage DC power supply.
[0068] The DC filtering module is a filtering component used to filter out the interference noise in the electrical signal flowing into the boost module. It can effectively suppress harmonics, interference, etc. in the electrical signal, and improve the use safety and stability of the variable-frequency device.
[0069] In one of the embodiments, the DC filtering module can be composed of a filtering inductor.
[0070] Specifically, by setting the DC filtering module and the DC input contactor between the boost module and the low-voltage DC power source, while improving the convenience of controlling the circuit connection between the boost module and the low-voltage DC power supply, it can effectively suppress harmonics, interference, etc. in the electrical signal, and improve the use safety and stability of the variable-frequency device.
[0071] The vehicle-mounted variable-frequency device is an integrated variable-frequency device that can be power-supply compatible for different power-supply vehicle models. In one embodiment, the AC side of the current adjustment module in the vehicle-mounted variable-frequency device can be connected to a first AC power supply or a condenser fan.
[0072] Specifically, when the vehicle-mounted variable-frequency device is applied to an AC power-supply vehicle model, the AC side of the current adjustment module in the vehicle-mounted variable-frequency device can be connected to a first AC power supply. In actual use, if the vehicle can be normally powered, the first AC power supply can output current to the current adjustment module. At this time, the current adjustment module can be regarded as a rectification module, which is used to rectify the current received on the AC side to obtain direct current, and input the direct current into the compressor variable-frequency module through the DC side of the compressor variable-frequency module. The compressor variable-frequency module performs an inversion process on the direct current to obtain an adjustable-frequency alternating current, and outputs the alternating current to the compressor through the AC side to supply power to the compressor, providing a use basis for the normal use of the vehicle-mounted air conditioner.
[0073] When the in-vehicle variable frequency device is applied to a medium-voltage DC power supply vehicle model, the AC side of the current adjustment module in the in-vehicle variable frequency device is connected to the condensation fan. During actual use, the current adjustment module can be regarded as an inverter, which performs inversion processing on the input direct current, and supplies the alternating current obtained after inversion to the condensation fan through the AC side to provide the basis for the normal use of the in-vehicle air conditioner.
[0074] In this embodiment, in different power supply vehicle models of the in-vehicle variable frequency device, the AC side of the current adjustment module can be connected to different air conditioning components, and the functions played when connecting different air conditioning components will also switch accordingly. Therefore, the in-vehicle variable frequency device can achieve the effect of power supply compatibility for different power supply vehicle models only through one current adjustment module, effectively reducing the device volume of the in-vehicle variable frequency device and the production cost and maintenance cost of the in-vehicle air conditioner.
[0075] In one embodiment, as Figure 4 shown, an in-vehicle variable frequency device is provided. The in-vehicle variable frequency device 100 includes a current adjustment module 101, a compressor variable frequency module 102, a boost module 103, a fan inverter module 104, a first negative busbar 1051, a first positive busbar 1052, a second negative busbar 1061, a second positive busbar 1062, a diode 1071, a fuse 1072, a DC filter inductor 108, and a DC input contactor 109.
[0076] Specifically, the DC side of the current adjustment module 101 is connected to the DC side of the compressor variable frequency module 102 through the first negative busbar 1051 and the first positive busbar 1052. The output end of the boost module 103 is connected to the DC side of the fan inverter module 104 through the second negative busbar 1061 and the second positive busbar 1062. The first negative busbar 1051 is connected to the second negative busbar 1061, and the first positive busbar 1052 is sequentially connected to the second positive busbar 1062 through the fuse 1072 and the diode 1071.
[0077] The AC side of the compressor variable frequency module 102 is connected to the compressor 201, the AC side of the fan inverter module 104 is connected to the ventilation fan 202, and the input end of the boost module 103 is sequentially connected to the low-voltage DC power supply 301 through the DC filter inductor 108 and the DC input contactor 109.
[0078] Based on the same inventive concept, the present application also provides an in-vehicle air conditioner, which is applied to an AC power supply vehicle model. The in-vehicle air conditioner includes a compressor, a ventilation fan, a condensation fan, and any one of the in-vehicle variable frequency devices described in the embodiments of the in-vehicle variable frequency device above.
[0079] When applied to an in-vehicle air conditioner for an AC power supply vehicle model, the AC side of the current adjustment module in the in-vehicle variable frequency device is connected to a first AC power supply, and the condensation fan is connected to a second AC power supply.
[0080] Specifically, taking the vehicle-mounted air conditioner including the vehicle-mounted variable-frequency device 100 shown as an example, the vehicle-mounted air conditioner will be described. As Figure 3 shown, the vehicle-mounted air conditioner 200 includes a compressor 201, a ventilation fan 202, a condenser fan 203, and a vehicle-mounted variable-frequency device 100. Figure 5
[0081] Figure 3 Among them, the specific connection relationship of each module in the vehicle-mounted variable-frequency device 100 is as shown, and the description of its connection relationship has been elaborated in detail in the foregoing text. In the vehicle-mounted air conditioner 200 of an AC-powered vehicle model, the AC side of the current adjustment module 101 in the vehicle-mounted variable-frequency device 100 is connected to the first AC power supply 302, and the condenser fan 203 is connected to the second AC power supply 303.
[0082] In actual use, when the vehicle can be normally powered, the first AC power supply 302 will output current into the current adjustment module 101. At this time, the current adjustment module 101 can be regarded as a rectification module to rectify the current received on the AC side to obtain direct current, and input the direct current into the compressor variable-frequency module 102 through the DC side of the compressor variable-frequency module 102. The compressor variable-frequency module 102 performs an inversion process on the direct current to obtain adjustable-frequency alternating current, and outputs the alternating current to the compressor 201 through the AC side to supply power to the compressor 201. At the same time, the second AC power supply 303 outputs current into the condenser fan 203 to supply power to the condenser fan 203.
[0083]
[0084] When the vehicle cannot be normally powered, the low-voltage DC power supply 301 will output current into the boost module 103. The boost module 103 performs a boosting process on the incoming current to obtain high-voltage direct current, and inputs the high-voltage direct current into the fan inverter module 104 through the DC side of the fan inverter module 104. The fan inverter module 104 performs an inversion process on the input high-voltage direct current to obtain adjustable-frequency alternating current, and outputs the alternating current to the ventilation fan 202 through the AC side to supply power to the ventilation fan 202 to ensure ventilation inside the vehicle. For the vehicle-mounted air conditioner in this embodiment, by using the vehicle-mounted variable-frequency device in the above embodiment, when the AC power supply of the AC-powered vehicle model is normal, the current adjustment module can directly rectify the compressor variable-frequency module and the fan inverter module, which can effectively reduce the equipment size of the vehicle-mounted air conditioner in the AC-powered vehicle model and reduce the production cost. In addition, by connecting the input end of the boost module to the low-voltage DC power supply and the output end to the DC side of the fan inverter module, when the AC-powered vehicle model cannot be normally powered, the low-voltage DC power supply can directly supply power to the ventilation fan, greatly reducing the installation volume and loading cost of the vehicle-mounted air conditioner.
[0085] In one embodiment, the vehicle-mounted air conditioner further includes a first AC input contactor and an AC filtering module. The current adjustment module is connected to the first AC power supply through the AC filtering module and the first AC input contactor in sequence.
[0086] Among them, the first AC input contactor is an electronic device used to connect and disconnect the connection circuit between the current adjustment module and the first AC power supply. By setting the first AC input contactor between the current adjustment module and the first AC power supply, the control flexibility of the circuit connection between the current adjustment module and the first AC power supply can be effectively improved.
[0087] The AC filtering module is a filtering component used to filter out the interference noise in the electrical signal flowing into the current adjustment module, which can effectively suppress harmonics, interference, etc. in the electrical signal and improve the use safety and stability of the frequency conversion device.
[0088] In one of the embodiments, the AC filtering module can be composed of a filtering inductor.
[0089] Specifically, by setting the AC filtering module and the first AC input contactor between the current adjustment module and the first AC power supply, while improving the control flexibility of the circuit connection between the current adjustment module and the first AC power supply, the harmonics, interference, etc. in the electrical signal can be effectively suppressed, and the use safety and stability of the frequency conversion device can be improved.
[0090] In one embodiment, the vehicle-mounted air conditioner further includes a second AC input contactor, and the condensing fan is connected to the second AC power supply through the second AC input contactor. Specifically, by setting the second AC input contactor between the condensing fan and the second AC power supply, the control flexibility of the circuit connection between the condensing fan and the second AC power supply can be improved.
[0091] In addition, in one embodiment, the vehicle-mounted air conditioner further includes a third AC input contactor and a fourth AC input contactor. The AC side of the fan inverter module in the vehicle-mounted frequency conversion device is connected to the ventilation fan through the third AC input contactor. The ventilation fan is also connected to the first AC power supply through the fourth AC input contactor.
[0092] Specifically, taking the vehicle-mounted frequency conversion device 100 included in the vehicle-mounted air conditioner as shown in Figure 3 as an example, the vehicle-mounted air conditioner will be described. As shown in Figure 6 the vehicle-mounted air conditioner 200 further includes a third AC input contactor 204 and a fourth AC input contactor 205.
[0093] Among them, the AC side of the fan inverter module 104 in the vehicle-mounted frequency conversion device 100 is connected to the ventilation fan 202 through the third AC input contactor 204, and the ventilation fan 202 is also connected to the first AC power supply 302 through the fourth AC input contactor 205, forming a fan standby operation circuit.
[0094] During actual use, when the connection lines between the modules in the vehicle-mounted frequency conversion device 100 can be used normally, the on / off of the third AC input contactor 204 can be used to control the on / off of the connection circuit between the fan inverter module 104 and the ventilation fan 202, thereby controlling whether to supply power to the ventilation fan 202 for operation.
[0095] When there is an abnormality in the connection route between the modules, or at least one of the current adjustment module 101 and the fan inverter module 104 has an abnormality, it can be determined that the vehicle-mounted air conditioner meets the usage conditions of the fan standby operation circuit. At this time, the third AC input contactor 204 can be controlled to disconnect, and at the same time, the fan standby operation circuit can be connected by turning on the fourth AC input contactor 205, and the first AC power supply 302 can directly supply power to the ventilation fan 202. It can be understood that during actual use, the operating states of the third AC input contactor 204 and the fourth AC input contactor 205 are different, that is, if the third AC input contactor 204 is in the on state, then the fourth AC input contactor 205 should be in the off state at this time, and vice versa, if the third AC input contactor 204 is in the off state, then the fourth AC input contactor 205 should be in the on state at this time.
[0096] In the above embodiment, by setting the third AC input contactor and the fourth AC input contactor, a fan standby operation circuit can be added to the air conditioner to improve the operation stability of the ventilation fan in an abnormal operating environment.
[0097] In one embodiment, as Figure 7 shown, a vehicle-mounted air conditioner applied to an AC-powered vehicle model is provided. The vehicle-mounted air conditioner 200 includes a compressor 201, a ventilation fan 202, a condenser fan 203, a third AC input contactor 204, a fourth AC input contactor 205, a first AC input contactor 206, an AC filter inductor 207, a second AC input contactor 208, and a vehicle-mounted frequency conversion device 100 as Figure 4 shown.
[0098] Among them, the AC side of the current adjustment module 101 in the vehicle-mounted frequency conversion device 100 is sequentially connected to the first AC power supply 302 through the AC filter inductor 207 and the first AC input contactor 206. The condensation fan 203 is connected to the second AC power supply 303 through the second AC input device 208. The AC side of the fan inverter module 104 in the vehicle-mounted frequency conversion device 100 is connected to the ventilation fan 202 through the third AC input contactor 204. At the same time, the ventilation fan 202 is also connected to the first AC power supply 302 through the fourth AC input contactor 205, forming a fan standby operation circuit.
[0099] In addition to the vehicle-mounted air conditioner that can be applied to AC-powered vehicle models described above, in one embodiment, the present application also provides a vehicle-mounted air conditioner applied to a medium-voltage DC-powered vehicle model. Among them, the vehicle-mounted air conditioner includes a compressor, a ventilation fan, a condensation fan, and any one of the vehicle-mounted frequency conversion devices described in the various embodiments of the above vehicle-mounted frequency conversion device.
[0100] When applied to a vehicle-mounted air conditioner for a medium-voltage DC-powered vehicle model, the AC side of the current adjustment module in the vehicle-mounted frequency conversion device is connected to the condensation fan, and the DC side of the current adjustment module, the DC side of the compressor frequency conversion module in the vehicle-mounted frequency conversion device, and the DC side of the fan inverter module in the vehicle-mounted frequency conversion device are respectively connected to the medium-voltage DC power supply.
[0101] Specifically, taking the vehicle-mounted frequency conversion device 100 included in the vehicle-mounted air conditioner as an example as Figure 3 shown, the vehicle-mounted air conditioner will be described. As Figure 8 shown, the vehicle-mounted air conditioner 300 includes a compressor 201, a ventilation fan 202, a condensation fan 203, and a vehicle-mounted frequency conversion device 100.
[0102] Among them, the specific connection relationships of the various modules in the vehicle-mounted frequency conversion device 100 are as Figure 3 shown, and the description of the connection relationships has been elaborated in detail above. In the vehicle-mounted air conditioner 300 for a DC-powered vehicle model, the AC side of the current adjustment module 101 in the vehicle-mounted frequency conversion device 100 is connected to the condensation fan 203, and the DC side of the current adjustment module 101, the DC side of the compressor frequency conversion module 102 in the vehicle-mounted frequency conversion device 100, and the DC side of the fan inverter module 104 in the vehicle-mounted frequency conversion module 100 are respectively connected to the medium-voltage DC power supply 303.
[0103] During actual use, when the vehicle can be normally powered, the medium-voltage DC power supply 303 can output current. The current can flow into the corresponding modules through the DC side of the current adjustment module 101, the DC side of the compressor frequency conversion module 102, and the DC side of the fan inverter module 104. The current adjustment module 101 can be regarded as an inverter in a medium-voltage DC-powered vehicle model, which performs inversion processing on the input direct current and supplies the alternating current obtained after inversion to the condensing fan 203 through the AC side. The compressor frequency conversion module 102 will perform inversion processing on the direct current to obtain adjustable-frequency alternating current, and output the alternating current to the compressor 201 through the AC side to supply power to the compressor 201. Similarly, the fan inverter 104 will perform inversion processing on the direct current to obtain adjustable-frequency alternating current, and output the alternating current to the ventilation fan 202 through the AC side to supply power to the ventilation fan 202.
[0104] When the vehicle cannot be normally powered, the low-voltage DC power supply 301 will output current into the boost module 103. The boost module 103 performs boost processing on the input current to obtain high-voltage direct current, and inputs the high-voltage direct current into the fan inverter module 104 through the DC side of the fan inverter module 104. The fan inverter module 104 performs inversion processing on the input high-voltage direct current to obtain adjustable-frequency alternating current, and outputs the alternating current to the ventilation fan 202 through the AC side to supply power to the ventilation fan 202 to ensure ventilation inside the vehicle.
[0105] The vehicle-mounted air conditioner in this embodiment can also use the vehicle-mounted frequency conversion device in the above embodiment to improve the frequency conversion processing function in a DC-powered vehicle model, realizing power supply compatibility for different powered vehicle models, and effectively reducing the production cost and maintenance cost of the vehicle-mounted air conditioner.
[0106] Furthermore, in one embodiment, the vehicle-mounted air conditioner further includes a pre-charge module. The DC sides of the current adjustment module, the compressor frequency conversion module, and the fan inverter module are respectively connected to the medium-voltage DC power supply through the pre-charge module.
[0107] Among them, the pre-charge module is a module used to pre-charge each module to be operated in the vehicle-mounted frequency conversion device. When powered, by performing pre-charge processing on each module to be operated in the vehicle-mounted frequency conversion device, the inrush current during power-on can be reduced to protect the circuit equipment.
[0108] Specifically, taking the vehicle-mounted frequency conversion device 100 shown in Figure 4 as an example, the vehicle-mounted air conditioner is described. As Figure 9As shown, the vehicle-mounted air conditioner 300 further includes a pre-charge module 209. The DC sides of the current adjustment module 101, the compressor variable-frequency module 102, and the fan inverter module 104 in the vehicle-mounted variable-frequency device 100 are connected through a common DC bus. In order to enable the current adjustment module 101, the compressor variable-frequency module 102, and the fan inverter module 104 to be connected to the medium-voltage DC power supply 303, the common DC bus can be tapped. Through the connection between the common DC bus and the medium-voltage DC power supply 303, the DC sides of the current adjustment module 101, the compressor variable-frequency module 102, and the fan inverter module 104 are respectively connected to the medium-voltage DC power supply 303.
[0109] At the same time, in order to reduce the inrush current during power-on and protect the circuit equipment, a pre-charge module 209 can be provided on the positive bus connecting the common DC bus and the medium-voltage DC power supply 303. The DC sides of the current adjustment module 101, the compressor variable-frequency module 102, and the fan inverter module 104 are respectively connected to the medium-voltage DC power supply 303 through the pre-charge module 209.
[0110] During actual use, the pre-charge module 209 will pre-charge the capacitors in the current adjustment module 101, the compressor variable-frequency module 102, and the fan inverter module 104, and power supply will be carried out only after the pre-charge is completed.
[0111] In one embodiment, the pre-charge module can be composed of a pre-charge resistor and a high-voltage DC input contactor. Specifically, during power-on, the pre-charge resistor can first charge the capacitors in each module to be operated, and then the high-voltage DC input contactor is turned on for DC power supply after the charging is completed.
[0112] In the above embodiment, by setting the pre-charge module, the inrush current during power-on can be reduced, and the operation stability and safety of the vehicle-mounted air conditioner during actual power-on can be improved.
[0113] It can be understood that in addition to the medium-voltage DC power supply vehicle models where a pre-charge module can be set, in other vehicle models, such as AC power supply vehicle models, a corresponding pre-charge module can also be set on the external current input circuit, such as the connection circuit between the low-voltage DC power supply and the input end of the boost module, or the connection circuit between the first AC power supply and the AC side of the current adjustment module, so as to reduce the inrush current during power-on and improve the operation stability and safety of the vehicle-mounted air conditioner during actual power-on.
[0114] In one embodiment, the vehicle-mounted air conditioner further includes a DC filter reactor. The DC sides of the current adjustment module, the compressor variable-frequency module, and the fan inverter module in the vehicle-mounted variable-frequency device are all connected to the medium-voltage DC power supply through the DC filter reactor and the pre-charge module in sequence.
[0115] In one embodiment, the vehicle-mounted air conditioner further includes a second fuse. The DC sides of the current adjustment module, the compressor frequency conversion module, and the fan inverter module in the vehicle-mounted frequency conversion device are sequentially connected to the medium-voltage DC power supply through a DC filter reactor, a pre-charge module, and the second fuse, respectively.
[0116] In one embodiment, as Figure 10 shown, a vehicle-mounted air conditioner applied to a medium-voltage DC vehicle model is provided. The vehicle-mounted air conditioner 300 includes a compressor 201, a ventilation fan 202, a condensing fan 203, a pre-charge resistor 2091, a high-voltage DC input contactor 2092, a DC filter reactor 210, a second fuse 211, and a vehicle-mounted frequency conversion device 100 as Figure 4 shown.
[0117] Among them, the AC side of the current adjustment module 101 in the vehicle-mounted frequency conversion device 100 is connected to the condensing fan 203. The DC sides of the current adjustment module 101, the compressor frequency conversion module 102 in the vehicle-mounted frequency conversion device 100, and the fan inverter module 104 in the vehicle-mounted frequency conversion module 100 are sequentially connected to the pre-charge resistor 2091 and the high-voltage DC input contactor 2092 through the DC filter reactor 210, respectively. It can be understood that the pre-charge resistor 2091 and the high-voltage DC input contactor 2092 are connected in parallel to form a pre-charge module, and after the pre-charge resistor 2091 and the high-voltage DC input contactor 2092 are connected in series with the second fuse 211, they are connected to the medium-voltage DC power supply 303.
[0118] On traditional AC-powered vehicle models, generally one frequency converter is configured for the compressor in the vehicle-mounted air conditioner. This frequency converter generally adopts a low-harmonic rectification method, such as active rectification, etc. After the rectification module rectifies, it supplies the inverter module to output to the compressor motor. When there is no AC power supply on the train, such as in case of no high-voltage or auxiliary power supply failure, it is necessary to supply low-voltage DC power through the battery output. After isolation and boosting through the DC-DC unit of the boost module, it supplies power to the ventilation fan through the fan inverter module to ensure ventilation in the passenger compartment. When the AC power supply is normal, it supplies power to the fan inverter unit after rectification by a diode rectification unit to achieve frequency conversion control of the fan.
[0119] On traditional medium-voltage DC-powered vehicle models, the vehicle-mounted air conditioner directly inputs medium-voltage DC to supply the compressor frequency conversion module and the fixed-frequency module to work.
[0120] It can be seen that in current rail transit vehicles with AC power supply, the compressor frequency conversion module and the fan frequency conversion module of the air-conditioning unit are each rectified separately. The two devices are large in volume and heavy in weight. The fan frequency conversion module uses passive rectification, resulting in a large harmonic content in the input current, and the filter is also large in volume and heavy in weight. In addition, current vehicles with AC and medium-voltage DC inputs use separately designed inverters, which are not compatible with each other, increasing the production cost and maintenance cost.
[0121] Based on the problems existing in the above-mentioned traditional on-vehicle air conditioners, it can be seen from the above embodiments of the present application that the on-vehicle frequency conversion device provided by the present application can be regarded as a multi-input voltage system on-rail transit vehicle air-conditioning frequency converter integrated machine, which integrates a current adjustment module, a compressor frequency conversion module, a boost module, and a fan inverter module. By setting a common DC bus for each module and isolating it with a diode, when the medium-voltage DC is input, the current adjustment module switches to the inverter mode to charge the condenser fan reversely, realizing the module compatibility when AC and medium-voltage DC are input.
[0122] Specifically, for the vehicle models with AC power supply, the compressor frequency conversion module and the ventilation inverter module share a group of current adjustment modules as an active ballast and an input filter. The compressor frequency conversion module and the ventilation inverter module share a DC bus, and are isolated by a diode and equipped with a fuse for overcurrent protection. When there is no AC power supply in the vehicle, the integrated machine boosts the low-voltage DC provided by the battery through the DC-DC unit in the boost module and supplies it to the fan inverter module to ensure the ventilation of the passenger compartment in the vehicle.
[0123] For the vehicle models with medium-voltage DC power supply, the current adjustment module in the integrated machine switches to the inverter mode to supply power to the condenser fan, and the original input filter is cancelled. The middle DC bus of the integrated machine is tapped, and a pre-charge circuit for input is added. The medium-voltage DC directly supplies power to the compressor frequency conversion module, the fan inverter module, and the current adjustment module (which can be regarded as a condenser inverter module). Before the input fan inverter module, it is also isolated by a diode and equipped with a fuse for overcurrent protection. When there is no medium-voltage DC power supply in the vehicle, the low-voltage DC provided by the battery can also be boosted through the DC-DC unit in the boost module and supplied to the fan inverter module to ensure the ventilation of the passenger compartment in the vehicle.
[0124] In the on-vehicle frequency conversion device and on-vehicle air conditioner in this application, by increasing the power of the current adjustment module and adopting the common busbar technology between modules, compared with the on-vehicle air conditioner of traditional AC-powered vehicles, the diode rectification and its filtering equipment of the ventilation fan are cancelled, and only one frequency converter can drive multiple motors, such as the ventilation fan, the condenser fan, etc., greatly reducing the installation volume and procurement cost. The current adjustment module adopts an active rectification topology, which can work in the active rectification state in cooperation with the input reactor in the forward direction and in the inverter mode in the reverse direction. Through the mode switching of the on-vehicle frequency conversion integrated machine, the compatibility of AC power supply and medium-voltage DC power supply is realized, and the spare parts of vehicles of two power supply system types can be shared, effectively reducing the operation and maintenance cost.
[0125] In addition, based on the same inventive concept, this application also provides a rail vehicle, and the on-vehicle air conditioner in the above embodiment can be carried on the rail vehicle.
[0126] Specifically, the rail vehicle can determine the on-vehicle air conditioner to be carried according to its own vehicle type. For example, in the case where the rail vehicle is an AC-powered vehicle type, the air conditioner applied to the AC-powered vehicle type can be carried in the rail vehicle; in the case where the rail vehicle is a medium-voltage DC-powered vehicle type, the air conditioner applied to the medium-voltage DC-powered vehicle type can be carried in the rail vehicle. Since the on-vehicle frequency conversion device in this application can be regarded as a multi-input voltage system rail transit on-vehicle air conditioner frequency conversion integrated machine, therefore, no matter what vehicle type the rail vehicle is, the on-vehicle air conditioner frequency conversion integrated machine can be used to build an on-vehicle air conditioner matching its own vehicle type, effectively improving the convenience of carrying the on-vehicle air conditioner on the rail vehicle and reducing the carrying cost and carrying complexity.
[0127] In the description of this specification, the descriptions referring to terms such as "some embodiments", "other embodiments", "ideal embodiments", etc. mean that the specific features, structures, materials or features described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
[0128] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.
[0129] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.
Claims
1. A vehicle-mounted variable-frequency device, characterized in that, It includes a current adjustment module, a compressor frequency conversion module, a boost module, and a fan inverter module; The DC side of the current adjustment module is connected to the DC side of the compressor frequency conversion module and the DC side of the fan inverter module; the AC side of the compressor frequency conversion module is connected to the compressor; the AC side of the fan inverter module is connected to the ventilation fan; The input end of the boost module is connected to a low-voltage DC power supply; the output end of the boost module is connected to the DC side of the fan inverter module.
2. The vehicle-mounted frequency conversion device according to claim 1, characterized in that The DC side of the current adjustment module is connected to the DC side of the compressor frequency conversion module through a first bus pair; the output end of the boost module is connected to the DC side of the fan inverter module through a second bus pair; the first negative bus in the first bus pair is connected to the second negative bus in the second bus pair; the first positive bus in the first bus pair is connected to the second positive bus in the second bus pair through an isolation module.
3. The vehicle-mounted frequency conversion device according to claim 2, characterized in that, The isolation module includes an isolation unit and an overcurrent protection unit; The input end of the overcurrent protection unit is connected to the first positive bus, and the output end of the overcurrent protection unit is connected to the second positive bus through the isolation unit.
4. The on-vehicle frequency conversion device according to any one of claims 1 to 3, characterized in that The vehicle-mounted frequency conversion device further includes a DC filtering module and a DC input contactor; the input end of the boost module is sequentially connected to the low-voltage DC power supply through the DC filtering module and the DC input contactor.
5. The in-vehicle variable frequency device according to any one of claims 1 to 3, characterized in that, The AC side of the current adjustment module is connected to a first AC power supply or a condensing fan.
6. A vehicle-mounted air conditioner, which is applied to a vehicle model powered by alternating current, is characterized in that, The vehicle-mounted air conditioner includes a compressor, a ventilation fan, a condensing fan, and the vehicle-mounted frequency conversion device according to any one of claims 1-5; The AC side of the current adjustment module in the vehicle-mounted frequency conversion device is connected to a first AC power supply; The condensing fan is connected to a second AC power supply.
7. The vehicle-mounted air conditioner according to claim 6, wherein The vehicle-mounted air conditioner further includes a first AC input contactor and an AC filtering module; The current adjustment module is connected to the first AC power supply through the AC filtering module and the first AC input contactor in sequence.
8. The vehicle-mounted air conditioner according to claim 6, characterized in that, The vehicle-mounted air conditioner further includes a second AC input contactor; the condensing fan is connected to the second AC power supply through the second AC input contactor.
9. The vehicle-mounted air conditioner according to any one of claims 6 to 8, characterized in that The vehicle-mounted air conditioner further includes a third AC input contactor and a fourth AC input contactor; The AC side of the fan inverter module in the vehicle-mounted frequency conversion device is connected to the ventilation fan through the third AC input contactor; The ventilation fan is further connected to the first AC power supply through the fourth AC input contactor.
10. A vehicle-mounted air conditioner, which is applied to a vehicle model powered by medium-voltage direct current, is characterized in that, The vehicle-mounted air conditioner includes a compressor, a ventilation fan, a condensing fan, and the vehicle-mounted frequency conversion device according to any one of claims 1-5; The AC side of the current adjustment module in the vehicle-mounted frequency conversion device is connected to the condensing fan; The DC side of the current adjustment module, the DC side of the compressor frequency conversion module in the vehicle-mounted frequency conversion device, and the DC side of the fan inverter module in the vehicle-mounted frequency conversion device are respectively connected to a medium-voltage DC power supply.
11. The vehicle-mounted air conditioner according to claim 10, characterized in that, The vehicle-mounted air conditioner further includes a pre-charge module; The DC side of the current adjustment module, the DC side of the compressor frequency conversion module, and the DC side of the fan inverter module are respectively connected to the medium-voltage DC power supply through the pre-charge module.
12. An orbital vehicle, characterized in that, The rail vehicle includes an on-vehicle air conditioner as described in any one of claims 6-11.