Aging detection system of vehicle-mounted refrigerator compressor frequency converter

Abstract

The utility model discloses an aging detection system of a vehicle-mounted refrigerator compressor frequency converter. The aging detection system comprises a transformer, a plurality of power supply selection contactors, a plurality of detection loads and a controller. Wherein the transformer is connected with an external power supply; the plurality of power supply selection contactors are respectively connected with the transformer, and one power supply selection contactor is correspondingly connected with one frequency converter to be subjected to aging detection; one detection liability is correspondingly connected with one frequency converter; and the controller is respectively connected with the plurality of power supply selection contactors and the plurality of frequency converters. By adopting the aging detection system provided by the utility model, the aging detection of a large batch of vehicle-mounted refrigerator compressor frequency converters can be realized, a brand new aging detection scheme is provided, and the aging detection system is very practical in actual production.

Description

Technical Field

[0001] The utility model relates to the technical field of inverter aging detection, in particular to an aging detection system for an inverter of a vehicle refrigerator compressor. Background Art

[0002] Car refrigerators are the continuation of household refrigerators. There are two main types of car refrigerators on the market. One is a semiconductor car refrigerator, which uses semiconductor electronic refrigeration technology; the other is a compressor car refrigerator, where the compressor is a traditional technology of traditional refrigerators. The refrigeration temperature of the compressor car refrigerator is low, ranging from -18 degrees to 10 degrees, and the refrigeration efficiency is high, which can make ice and preserve freshness. In the circuit system of the car refrigerator, the inverter is a very critical electrical component for the compressor. Its role in the compressor is mainly energy saving, precise control, wide speed regulation range and reduced startup impact, thereby improving the operating efficiency and stability of the system and reducing energy consumption and maintenance costs.

[0003] Unsafe and low-quality products not only endanger personal safety, but may also cause heavy losses to the company. Therefore, before the product leaves the factory, the inverter of the product must be subjected to a long-term load aging test to test its stability. This is one of the indispensable links in the production of compressor-based car refrigerators.

[0004] At present, the industry adopts the method of directly connecting the inverter to the power supply and load and performing aging detection one by one. Since car refrigerators are a new generation of refrigeration appliances that have become popular in the market in recent years with new energy vehicles, there is no mature and good batch aging detection solution for car refrigerator compressor inverters in the industry. Utility Model Content

[0005] In order to overcome the above technical defects, the utility model provides an aging detection system for a vehicle refrigerator compressor inverter.

[0006] In order to solve the above problems, the utility model is implemented according to the following technical solutions:

[0007] The utility model discloses an aging detection system for a vehicle refrigerator compressor inverter, the aging detection system comprising:

[0008] A transformer connected to an external power source;

[0009] A plurality of power selection contactors, wherein the plurality of power selection contactors are respectively connected to the transformer, and one power selection contactor is correspondingly connected to a frequency converter to be tested for aging;

[0010] Multiple detection loads, one detection load is connected to one inverter;

[0011] A controller is connected to a plurality of power selection contactors and a plurality of frequency converters respectively.

[0012] Preferably, the detection load is a resistance simulation load, and the resistance simulation load includes:

[0013] A first resistor, one end of which is connected to the U terminal of the frequency converter, and the other end of which is connected to the second resistor and the third resistor respectively;

[0014] A second resistor, one end of the second resistor is connected to the V end of the frequency converter, and the other end of the second resistor is connected to the first resistor and the third resistor respectively;

[0015] A third resistor, one end of the third resistor is connected to the W end of the inverter, and the other end of the third resistor is connected to the first resistor and the second resistor respectively.

[0016] Preferably, the detection load is a motor simulation load, and the motor simulation load includes:

[0017] A motor and brake resistor selection contactor, wherein the motor and brake resistor selection contactor is connected to the frequency converter;

[0018] A motor braking resistor, the motor braking resistor and the motor and braking resistor selection contactor;

[0019] A motor, the motor being connected to the motor and a brake resistor selection contactor;

[0020] Wherein, the controller is connected with the motor and the brake resistor selection contactor.

[0021] Preferably, the controller is a programmable controller.

[0022] Preferably, the controller is connected to the frequency converter via an RS485 cable and communicates via a Modibus protocol.

[0023] Preferably, the DI / O port of the controller is connected to a frequency converter.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] The utility model provides an aging detection system for a vehicle refrigerator compressor inverter, the aging detection system comprising a transformer, a plurality of power selection contactors, a plurality of detection loads and a controller. The transformer is connected to an external power supply; a plurality of power selection contactors are respectively connected to the transformer, one power selection contactor is correspondingly connected to a frequency converter to be aging detected; one detection load is correspondingly connected to a frequency converter; the controller is respectively connected to a plurality of power selection contactors and a plurality of frequency converters.

[0026] In this technology, the transformer is used to convert the voltage of the external power supply into the voltage required by transformers of different specifications, so that the voltage required by transformers of large quantities and different models and specifications can be supplied. The power selection contactor is used to connect the transformer and the inverter to be tested for aging. Each inverter has a corresponding power selection contactor, which can realize the selection of power supply for each inverter, so that the aging detection system can be compatible with different inverters for aging detection. The detection load is used to simulate the actual working load in order to perform aging detection on the inverter. By connecting the load, the aging detection system can simulate the operation of the inverter under real working conditions.

[0027] The aging detection system of the utility model can realize the aging detection of a large number of vehicle refrigerator compressor inverters, providing a new aging detection solution and being extremely practical in actual production. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0029] Figure 1 The utility model is a system block diagram of an aging detection system for a vehicle refrigerator compressor inverter with a motor simulated load.

[0030] Figure 2 It is a circuit diagram of a resistance simulated load of the utility model;

[0031] Figure 3 The utility model is a circuit topology diagram of connecting a resistance simulation load with a frequency converter. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0033] like Figure 1-2 As shown, the preferred structure of the aging detection system for the vehicle refrigerator compressor inverter described in the utility model.

[0034] like Figure 1 As shown, the aging detection system of the utility model includes a transformer, multiple power selection contactors, multiple detection loads and a controller. The transformer is connected to an external power supply; multiple power selection contactors are respectively connected to the transformer, one power selection contactor is correspondingly connected to a frequency converter to be aging detected; one detection load is correspondingly connected to a frequency converter; and the controller is respectively connected to multiple power selection contactors and multiple frequency converters.

[0035] In this technology, the transformer is used to convert the voltage of the external power supply into the voltage required by transformers of different specifications, so that the voltage required by transformers of large quantities and different models and specifications can be supplied. The power selection contactor is used to connect the transformer and the inverter to be tested for aging. Each inverter has a corresponding power selection contactor, which can realize the selection of power supply for each inverter, so that the aging detection system can be compatible with different inverters for aging detection. The detection load is used to simulate the actual working load in order to perform aging detection on the inverter. By connecting the load, the aging detection system can simulate the operation of the inverter under real working conditions.

[0036] The aging detection system of the utility model can realize the aging detection of a large number of vehicle refrigerator compressor inverters, providing a new aging detection solution and being extremely practical in actual production.

[0037] In a specific implementation, the transformer can output multiple voltages and can be set in combination with the frequency converter purchased for production, which will not be elaborated in this application.

[0038] In a specific implementation, the controller adopts a programmable controller, and specifically, a Siemens S7-226 programmable controller can be adopted.

[0039] Specifically, the controller is connected to the frequency converter via an RS485 cable and communicates via the Modibus protocol. The DI / O port of the controller is connected to the frequency converter. The controller is also connected to a power selection contactor, a detection load, etc. via a plurality of different DI / O ports.

[0040] Among them, in order to improve the efficiency of aging detection, the aging detection system can perform aging detection on multiple inverters of different models or the same model at one time. Based on Siemens S7-226PLC and related modules, Modibus communication with the inverter is adopted to read out the model, test voltage, motor power, motor operation mode, forward and reverse operation time, brake resistor selection and other parameters in the inverter register. Through the digital input and output module control of PLC, intelligent aging test of multiple types of inverters at multiple stations is realized. After aging is completed, the test results are displayed, and the test results are written in the status word of the inverter through Modibus for the needs of subsequent processes.

[0041] The purpose of the power selection contactor is to switch the conduction of power supplies of different voltages for use by the frequency converter. In one implementation of the detection load, the detection load includes a motor and brake resistor selection contactor, which can be used to switch motors or motor brake resistors, and can also be used to switch motors of different models for aging detection needs.

[0042] In a specific implementation, the aging detection system may further include an aging temperature control box, which is used to place multiple inverters to be detected. The aging temperature control box is connected to the controller, and the working mode of the temperature control aging box is realized by the combination control of the three digital outputs of the PLC.

[0043] Specifically, the aging temperature control box is directly purchased from existing products, also known as a temperature-controlled aging box, which does not belong to the innovation of this patent and will not be explained in detail here.

[0044] In the utility model, the aging detection system provides the following two different implementations of detection loads. The two detection loads can be used simultaneously in the same aging detection system, or only one of them can be used separately. The specific implementation can be based on actual needs. The difference between the two is only whether they form a connection control relationship with the controller.

[0045] (I) The first type of detection load:

[0046] like Figure 2 As shown, the detection load is a resistance simulation load, and the resistance simulation load includes:

[0047] A first resistor, one end of which is connected to the U terminal of the frequency converter, and the other end of which is connected to the second resistor and the third resistor respectively;

[0048] A second resistor, one end of the second resistor is connected to the V end of the frequency converter, and the other end of the second resistor is connected to the first resistor and the third resistor respectively;

[0049] A third resistor, one end of the third resistor is connected to the W end of the inverter, and the other end of the third resistor is connected to the first resistor and the second resistor respectively.

[0050] The first detection load is to solve the problem of uncontrollable power due to inverter aging. By using a fixed-resistance power resistor to replace the compressor drive motor winding, generally there are three drive motor windings, and the three windings are star-connected. Here, the power resistor is used to replace the motor winding. The three resistors are also connected in star shape to achieve load replacement. Since the resistance value is fixed, the load is fixed and will not change significantly. This method can solve the problem of uncontrollable aging power. Inverter aging is essentially the operation of all components on the inverter. Through the first detection load solution itself, the inverter can be aged without connecting to the actual motor load, meeting the production needs of large-scale vehicle refrigerator compressor inverter aging.

[0051] In actual use, it is necessary to replace the program inside the inverter, adjust and fix the inverter output. Because if the load is only changed from the motor to the power resistor, the power resistor cannot feedback the motor speed like the compressor winding, and the inverter cannot output normally, which means that the power output part of the inverter does not participate in aging, and the purpose of inverter aging cannot be achieved. For this reason, it is necessary to update the internal program of the inverter to a fixed output program so that the power output part of the inverter can output according to normal operation. After the aging is completed, the inverter can be updated back to the normal program.

[0052] (II) The second test load:

[0053] like Figure 1 As shown, the detection load is a motor simulation load, and the motor simulation load includes:

[0054] A motor and brake resistor selection contactor, wherein the motor and brake resistor selection contactor is connected to the frequency converter;

[0055] A motor braking resistor, the motor braking resistor and the motor and braking resistor selection contactor;

[0056] A motor, the motor being connected to the motor and a brake resistor selection contactor;

[0057] Wherein, the controller is connected with the motor and the brake resistor selection contactor.

[0058] The second test load is a simulation scenario that actually uses a real motor.

[0059] In a preferred implementation, the actual compressor load can also be used for aging. Specifically, the compressor is connected with an evaporator, a condenser, and a throttling device, etc., to assemble a compressor system. Then, the compressor system is evacuated and filled with refrigerant to obtain a simulated real compressor load. During use, the condenser needs to be radiated to avoid excessive refrigerant pressure, which causes excessive load on the compressor.

[0060] For other structures of the aging detection system for a vehicle refrigerator compressor inverter described in this embodiment, refer to the prior art.

[0061] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Therefore, any modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An aging detection system for a vehicle refrigerator compressor inverter, characterized in that: The aging detection system comprises: A transformer connected to an external power source; A plurality of power selection contactors, wherein the plurality of power selection contactors are respectively connected to the transformer, and one power selection contactor is correspondingly connected to a frequency converter to be tested for aging; Multiple detection loads, one detection load is connected to one inverter; A controller is connected to a plurality of power selection contactors and a plurality of frequency converters respectively.

2. The aging detection system for a vehicle refrigerator compressor inverter according to claim 1 is characterized in that: The detection load is a resistance simulation load, and the resistance simulation load includes: A first resistor, one end of which is connected to the U terminal of the frequency converter, and the other end of which is connected to the second resistor and the third resistor respectively; A second resistor, one end of the second resistor is connected to the V end of the frequency converter, and the other end of the second resistor is connected to the first resistor and the third resistor respectively; A third resistor, one end of the third resistor is connected to the W end of the inverter, and the other end of the third resistor is connected to the first resistor and the second resistor respectively.

3. The aging detection system for a vehicle refrigerator compressor inverter according to claim 1, characterized in that: The detection load is a motor simulation load, and the motor simulation load includes: A motor and brake resistor selection contactor, wherein the motor and brake resistor selection contactor is connected to the frequency converter; A motor braking resistor, the motor braking resistor and the motor and braking resistor selection contactor; A motor, the motor being connected to the motor and a brake resistor selection contactor; Wherein, the controller is connected with the motor and the brake resistor selection contactor.

4. The aging detection system for a vehicle refrigerator compressor inverter according to claim 1 is characterized in that: The controller is a programmable controller.

5. The aging detection system for a vehicle refrigerator compressor inverter according to claim 4 is characterized in that: The controller is connected to the frequency converter via an RS485 cable and communicates via the Modibus protocol.

6. The aging detection system for a vehicle refrigerator compressor inverter according to claim 4, characterized in that: The DI / O port of the controller is connected to the frequency converter.

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