A direct current air conditioner

Abstract

The utility model belongs to air conditioning technical field relates to a kind of direct current air conditioner, including outdoor unit and control box, the outdoor unit is equipped with first direct current brushless motor, the control box is equipped with second direct current brushless motor and third direct current brushless motor, the first direct current brushless motor is equipped with first driving device, the second direct current brushless motor is equipped with second driving device, the third direct current brushless motor is equipped with third driving device, the outdoor unit, the first direct current brushless motor, the control box, the second direct current brushless motor, the third direct current brushless motor, the first driving device, the second driving device and the third driving device are connected by electricity. Air conditioner compressor motor, outdoor fan motor and indoor fan motor are all replaced with direct current brushless motor, and corresponding driving device is matched for it, so that the use of air conditioner is more reliable, and hardware conditions are provided for intelligent management of next step air conditioner, which can be generally applicable to railway locomotive field etc.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and more specifically, to a DC air conditioner. Background Technology

[0002] Since the locomotive lacks household 380V or 220V AC power, all air conditioners require power from inverters. However, electromagnetic interference from the locomotive's traction power causes even simple air conditioning units to malfunction. Inverter failures also lead to unreliable and expensive air conditioning systems. Utility Model Content

[0003] To address the aforementioned deficiencies in the prior art, this utility model provides a DC air conditioner, comprising an outdoor unit and a control box. The outdoor unit is equipped with a first brushless DC motor, and the control box is equipped with a second brushless DC motor and a third brushless DC motor. The first brushless DC motor is equipped with a first drive device, the second brushless DC motor is equipped with a second drive device, and the third brushless DC motor is equipped with a third drive device. The outdoor unit, the first brushless DC motor, the control box, the second brushless DC motor, the third brushless DC motor, the first drive device, the second drive device, and the third drive device are electrically connected.

[0004] Preferably, the first drive device includes a first power conversion unit, a first control processing unit, and a first protection monitoring unit that are electrically connected.

[0005] Preferably, the second drive device includes a second power conversion unit, a second control processing unit, and a second protection monitoring unit that are electrically connected.

[0006] Preferably, the third drive device includes a third power conversion unit, a third control processing unit, and a third protection monitoring unit that are electrically connected.

[0007] Preferably, the first power conversion unit includes a first rectifier circuit, a first inverter circuit, and a first DC bus capacitor that are electrically connected.

[0008] Preferably, the first control processing unit includes a first microcontroller, a first position sensor, and a first driver chip that are electrically connected.

[0009] Preferably, the first protection monitoring unit includes a first current detection module, a first voltage detection module, and a first temperature protection module that are electrically connected.

[0010] Preferably, the first rectifier circuit adopts a VIENNA rectifier topology, including a three-phase full-bridge structure composed of 6 IGBT modules.

[0011] Preferably, the first inverter circuit includes: two IGBTs configured for each phase to form an H-bridge structure, and a total of six IGBTs configured for the three phases to form the inverter main circuit.

[0012] Preferably, the first microcontroller includes a TMS320F28335.

[0013] The DC air conditioner implementing this utility model has the following beneficial effects:

[0014] (1) From the perspective of energy efficiency, the DC brushless motor, with the help of a dedicated drive device, can precisely adjust the speed according to actual needs; compared with the traditional AC motor, it can greatly reduce unnecessary energy loss, effectively reduce energy consumption, and save users considerable electricity expenses in the long term.

[0015] (2) In terms of operational stability, the DC brushless motor has a simple structure and no mechanical friction between the brush and the commutator, which reduces the probability of failure and extends the service life of the motor. At the same time, each drive device independently controls the corresponding motor, making the system operation more stable and reliable, and reducing the risk of air conditioner shutdown due to motor failure.

[0016] (3) In terms of noise control, the DC brushless motor operates smoothly, significantly reducing vibration and noise. Whether it is day or night, it can create a quiet and comfortable indoor environment for users, improving the user experience;

[0017] (4) The electrical connection design makes the components work together more efficiently; the control box can respond quickly and accurately regulate the operation of each motor to achieve rapid cooling and heating, and the temperature control accuracy is higher, which can better meet the user's personalized needs for indoor temperature and bring the user a high-quality air conditioning experience.

[0018] (5) The air conditioner compressor motor, outdoor fan motor and indoor fan motor have all been replaced with DC brushless motors and equipped with corresponding drive devices, making the use of air conditioners more reliable and providing hardware conditions for the next step of intelligent management of air conditioners. It can be widely applied to railway locomotive fields, etc. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort. The utility model will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0020] Figure 1This is a schematic diagram of the constituent modules of the DC air conditioner of this utility model;

[0021] Figure 2 This is a circuit diagram of the relay connection in the control box of the DC air conditioner of this utility model;

[0022] Figure 3 This is a circuit diagram of the changeover switch connection in the control box of the DC air conditioner of this utility model;

[0023] Figure 4 This is a circuit diagram showing the connection between the relay and the indoor and outdoor fans in the control box of the DC air conditioner of this utility model;

[0024] Figure 5 This is a schematic diagram of the control box for the DC air conditioner of this utility model. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0027] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0028] Please see Figure 1 This is a schematic diagram of the constituent modules of the DC air conditioner of this utility model. Figure 1As shown, the DC air conditioner provided in the first embodiment of this utility model includes at least an outdoor unit and a control box. The outdoor unit is equipped with a first brushless DC motor, and the control box is equipped with a second brushless DC motor and a third brushless DC motor. The first brushless DC motor is equipped with a first drive device, the second brushless DC motor is equipped with a second drive device, and the third brushless DC motor is equipped with a third drive device. The outdoor unit, the first brushless DC motor, the control box, the second brushless DC motor, the third brushless DC motor, the first drive device, the second drive device, and the third drive device are electrically connected.

[0029] The first drive unit includes a first power conversion unit, a first control processing unit, and a first protection monitoring unit that are electrically connected.

[0030] The first power conversion unit includes a first rectifier circuit, a first inverter circuit, and a first DC bus capacitor that are electrically connected.

[0031] The first rectifier circuit adopts a VIENNA rectifier topology, including a three-phase full-bridge structure composed of six IGBT modules (including but not limited to FF600R12ME3, etc.). The three-phase full-bridge structure can achieve high-efficiency AC / DC conversion (efficiency ≥98%).

[0032] The first inverter circuit includes: two IGBTs per phase (including but not limited to FP40R12KE3, which is selected in this embodiment) to form an H-bridge structure, with a total of six IGBTs configured for the three phases to form the main inverter circuit, supporting PWM modulation frequency up to 20kHz.

[0033] The first DC bus capacitor can be a film capacitor (model B43504C2227M) with a capacitance of 220μF / 450V and an equivalent series resistance (ESR) of ≤5mΩ to ensure stable bus voltage.

[0034] The first control processing unit includes a first microcontroller, a first position sensor, and a first driver chip that are electrically connected.

[0035] The first microcontroller can be, but is not limited to, TI's C2000 series DSPs such as the TMS320F28335. The TMS320F28335 has a main frequency of 150MHz and integrates a 12-bit ADC (16 channels), a PWM generator (18 channels), and a CAN controller.

[0036] The first position sensor can be configured with a Hall effect sensor (such as, but not limited to, AH49E) and an encoder (such as, but not limited to, E6B2-CWZ6C) to achieve accurate rotor position detection (resolution 1000P / R).

[0037] The first driver chip can be the IR2136 driver chip from IR Corporation, which provides three high-voltage side drives and three low-voltage side drives, with an adjustable dead time range of 50ns-500ns.

[0038] The first protection monitoring unit includes a first current detection module, a first voltage detection module, and a first temperature protection module that are electrically connected.

[0039] The first current detection module can use a Hall current sensor (model including but not limited to CSNE151-100, etc.), with a measurement range of ±50A and an accuracy of ±0.5%.

[0040] The first voltage detection module can use a voltage divider resistor network (accuracy 0.1%) in conjunction with an operational amplifier (model including but not limited to OPA2277, etc.) to monitor the bus voltage.

[0041] The first temperature protection module can integrate an NTC thermistor (models include, but are not limited to, MF52-103-3435, etc.), with a temperature detection range of -40℃ to +150℃.

[0042] Similarly, the second drive unit includes a second power conversion unit, a second control processing unit, and a second protection monitoring unit that are electrically connected.

[0043] The second power conversion unit includes a second rectifier circuit, a second inverter circuit, and a second DC bus capacitor that are electrically connected.

[0044] The second rectifier circuit adopts a VIENNA rectifier topology, including a three-phase full-bridge structure composed of six IGBT modules (including but not limited to FF600R12ME3, etc.). The three-phase full-bridge structure can achieve high-efficiency AC / DC conversion (efficiency ≥98%).

[0045] The second inverter circuit includes: two IGBTs per phase (including but not limited to FP40R12KE3, which is selected in this embodiment) to form an H-bridge structure, with a total of six IGBTs configured for the three phases to form the main inverter circuit, supporting PWM modulation frequency up to 20kHz.

[0046] The second DC bus capacitor can be a film capacitor (model B43504C2227M) with a capacitance of 220μF / 450V and an equivalent series resistance (ESR) ≤5mΩ to ensure stable bus voltage.

[0047] The second control processing unit includes a second microcontroller, a second position sensor, and a second drive chip that are electrically connected.

[0048] The second microcontroller can be, but is not limited to, TI's C2000 series DSPs such as the TMS320F28335. The TMS320F28335 has a main frequency of 150MHz and integrates a 12-bit ADC (16 channels), a PWM generator (18 channels), and a CAN controller.

[0049] The second position sensor can be configured with a Hall effect sensor (such as, but not limited to, AH49E) and an encoder (such as, but not limited to, E6B2-CWZ6C) to achieve accurate rotor position detection (resolution 1000P / R).

[0050] The second driver chip can be the IR2136 driver chip from IR Corporation, which provides three high-voltage side drives and three low-voltage side drives, with an adjustable dead time range of 50ns-500ns.

[0051] The second protection monitoring unit includes a second current detection module, a second voltage detection module, and a second temperature protection module that are electrically connected.

[0052] The second current detection module can use a Hall current sensor (model including but not limited to CSNE151-100, etc.), with a measurement range of ±50A and an accuracy of ±0.5%.

[0053] The second voltage detection module can use a voltage divider resistor network (accuracy 0.1%) in conjunction with an operational amplifier (model including but not limited to OPA2277, etc.) to achieve bus voltage monitoring.

[0054] The second temperature protection module can integrate an NTC thermistor (models include, but are not limited to, MF52-103-3435, etc.), with a temperature detection range of -40℃ to +150℃.

[0055] Similarly, the third drive unit includes a third power conversion unit, a third control processing unit, and a third protection monitoring unit that are electrically connected.

[0056] The third power conversion unit includes a third rectifier circuit, a third inverter circuit, and a third DC bus capacitor that are electrically connected.

[0057] The third rectifier circuit adopts a VIENNA rectifier topology, including a three-phase full-bridge structure composed of six IGBT modules (including but not limited to FF600R12ME3, etc.). The three-phase full-bridge structure can achieve high-efficiency AC / DC conversion (efficiency ≥98%).

[0058] The third inverter circuit includes: two IGBTs per phase (including but not limited to FP40R12KE3, which is selected in this embodiment) to form an H-bridge structure, with a total of six IGBTs configured for the three phases to form the main inverter circuit, supporting PWM modulation frequency up to 20kHz.

[0059] The third DC bus capacitor can be a film capacitor (model B43504C2227M) with a capacitance of 220μF / 450V and an equivalent series resistance (ESR) ≤5mΩ to ensure stable bus voltage.

[0060] The third control processing unit includes a third microcontroller, a third position sensor, and a third drive chip that are electrically connected.

[0061] The third microcontroller can be, but is not limited to, TI's C2000 series DSPs such as the TMS320F28335. The TMS320F28335 has a main frequency of 150MHz and integrates a 12-bit ADC (16 channels), a PWM generator (18 channels), and a CAN controller.

[0062] The third position sensor can be configured with a Hall effect sensor (such as, but not limited to, model AH49E) and an encoder (such as, but not limited to, model E6B2-CWZ6C) to achieve accurate rotor position detection (resolution 1000P / R).

[0063] The third driver chip can be the IR2136 driver chip from IR Corporation, which provides three high-voltage side drives and three low-voltage side drives, with an adjustable dead time range of 50ns-500ns.

[0064] The third protection monitoring unit includes a third current detection module, a third voltage detection module, and a third temperature protection module that are electrically connected.

[0065] The third current detection module can use a Hall current sensor (model including but not limited to CSNE151-100, etc.), with a measurement range of ±50A and an accuracy of ±0.5%.

[0066] The third voltage detection module can use a voltage divider resistor network (accuracy 0.1%) in conjunction with an operational amplifier (model including but not limited to OPA2277, etc.) to achieve bus voltage monitoring.

[0067] The third temperature protection module can integrate an NTC thermistor (models include, but are not limited to, MF52-103-3435, etc.), with a temperature detection range of -40℃ to +150℃.

[0068] Figure 2 This is a circuit diagram of the relay connection in the control box of the DC air conditioner of this utility model. Figure 2As shown, relay KA2 is connected in series with the compressor and the protective switch. When the air conditioning system meets the start-up conditions, the control circuit outputs a signal to energize the KA2 coil, closing its contacts. At this time, current flows sequentially through the protective switch and the closed KA2 contacts to the compressor, energizing it and enabling it to run. If an abnormality occurs during operation, such as overload or overcurrent, the protective switch automatically disconnects, cutting off the current path and stopping the compressor to prevent equipment damage. The KA2 contacts reliably close when energized and quickly open when de-energized, ensuring the entire control circuit stably and safely controls the compressor's start and stop.

[0069] Figure 3 This is a circuit diagram showing the connection of the selector switch in the control box of the DC air conditioner of this utility model. Figure 3 As shown, pin 2 of the selector switch SA is connected to one end of relay KA3. The other end of relay KA3 is connected to one end of relay KA1 and one end of relay KA2. The other end of relay KA1 is connected to the other end of relay KA2 and pin 4 of the selector switch SA. When the selector switch SA is switched to a specific position, pin 2 and pin 4 form a circuit. At this time, the electrical signal output from pin 2 is transmitted to relay KA3, causing it to engage. After KA3 engages, it provides a conduction path for relays KA1 and KA2. After receiving electrical energy, KA1 and KA2 operate, and their contacts close to control different functional modules of the air conditioner. By switching SA to different positions, the operating states of KA1 and KA2 can be changed, realizing flexible switching of multiple operating modes of the DC air conditioner, meeting the needs of different working conditions, and ensuring the efficient and stable operation of the air conditioner.

[0070] Figure 4 This is a circuit diagram showing the connection between the relay and the indoor and outdoor fans in the control box of the DC air conditioner of this utility model. Figure 4 As shown, relay KA3 is connected in series with the indoor fan, and relay KA1 is connected in series with both the indoor and outdoor fans. Both the indoor and outdoor fans are equipped with DC brushless motors. Relay KA3 is connected in series with the indoor fan; when the coil of KA3 is energized, the contacts close, supplying power to the DC brushless motor of the indoor fan, enabling it to circulate indoor air. Relay KA1 is also connected in series with both the indoor and outdoor fans; when KA1 is energized and closes, the DC brushless motor of the outdoor fan starts, expelling hot indoor air, and the indoor fan also runs synchronously. By controlling the on / off state of the relays, the start / stop and operation of the indoor and outdoor fans can be precisely controlled, achieving flexible control of the air conditioning's air supply and heat exchange functions, ensuring efficient and stable operation of the air conditioning system, and creating a comfortable indoor environment.

[0071] A three-level distributed drive architecture is adopted, with each motor equipped with an independent drive module. Real-time communication between the main control board and the drive modules is achieved through a CAN bus. The drive modules integrate functions such as power conversion, signal processing, and protection monitoring to form a complete motor control system.

[0072] In some optional implementations, the first, second, and third brushless DC motors can all be selected from the 42BL, 60BL, 86BL, and 110BL series motors.

[0073] The 42BL series motors are compact, lightweight, and feature high-precision control characteristics.

[0074] The 60BL series motors have relatively high power, providing strong power and ensuring stable output of high torque in various working scenarios to meet the needs of high-intensity operations.

[0075] The 86BL series motors have high output power and high speed.

[0076] The 110BL series motors operate smoothly and with low noise, providing users with a comfortable and quiet user experience.

[0077] In some optional implementations, the drive system of this DC air conditioner has the following main circuit input: three-phase AC power is connected to a VIENNA rectifier via an EMI filter (model B84771), outputting a stable 400V DC bus. The inverter input is: the DC bus voltage is converted to a three-phase PWM voltage via an IGBT inverter bridge, smoothed by an LC filter (L=1mH, C=10μF), and then used to drive the motor. The braking unit can be configured with a braking resistor (100Ω / 200W) and an IGBT switch (model FP15R12KE3) to achieve energy regenerative braking.

[0078] In some optional implementations, in the drive system of this DC air conditioner, the control circuit can be configured such that the DSP connects to the driver chip IR2136 via an SPI interface, outputting 6 PWM signals to control the IGBT switches. Hall sensor and encoder signals are shaped by a Schmitt trigger (model 74HC14) and then input to the DSP's CAP / QEP module. The current detection signal is filtered by an RC filter (τ=10μs) and then input to the DSP's ADC module to achieve closed-loop current control.

[0079] In some optional implementations, the communication interface of the DC air conditioner drive system of this invention can adopt the CAN2.0B protocol, with a baud rate set to 500kbps, and a TJA1050 transceiver used at the physical layer. The main control board sends speed commands (16-bit signed integers, ranging from -3000 to +3000 rpm) to the drive module via the CAN bus. The drive module feeds back status information including, but not limited to: actual speed (16-bit), bus voltage (12-bit), phase current (12-bit), and fault codes (8-bit).

[0080] Figure 5 This is a schematic diagram of the control box for the DC air conditioner of this utility model. Figure 5 As shown, the switch turns on the power to the cooling fan, causing it to operate. Then, the selector switch is turned to the smart mode to activate the cooling fan. The smart module includes the internal fan module and the external fan module. If the selector switch is turned on, the heating plate activates the heating module, stops the cooling module, and activates the internal fan to power the heating module.

[0081] The driving control principle of this utility model DC air conditioner is:

[0082] (1) Vector control strategy:

[0083] Decoupled control is achieved by using rotor field-oriented control (FOC) with id=0:

[0084] Coordinate transformation: The three-phase current is converted into the αβ coordinate system through Clarke transformation, and then converted into the dq coordinate system through Park transformation.

[0085] Current loop control: d-axis current setpoint id=0, q-axis current setpoint iq is determined by the speed loop output, using a PI regulator (Kp=0.5, Ki=50).

[0086] Voltage decoupling: Compensate for the cross-coupled voltage terms ωLiq and ωLid to achieve independent control of the dq axis.

[0087] Space Vector Modulation (SVPWM): Generates a seven-segment SVPWM waveform with a modulation ratio M∈[0,1.15] and a switching frequency of 16kHz.

[0088] (2) Start control process:

[0089] Pre-positioning stage: Apply a fixed voltage vector to position the rotor to a known position (error ±15° electrical angle).

[0090] Open-loop start: Accelerate to 500 rpm at 500 rpm / s while monitoring the back EMF to confirm the rotor position.

[0091] Closed-loop switching: When the back EMF amplitude reaches the threshold (5V peak-to-peak value), switch to closed-loop vector control.

[0092] (3) Protection mechanism:

[0093] Overcurrent protection: Set the threshold of the hardware comparator (LM339) to 15A, and immediately block the PWM output after triggering.

[0094] Overvoltage protection: Monitors bus voltage; activates braking unit when it exceeds 450V; reports undervoltage fault when it falls below 350V.

[0095] Overheat protection: The change in the resistance value of the NTC resistor is converted into a voltage signal by the voltage divider circuit. When it exceeds 2.5V, it triggers derating operation.

[0096] The beneficial effects of this utility model, through the design of the above embodiments, are as follows:

[0097] (1) From the perspective of energy efficiency, the DC brushless motor, with the help of a dedicated drive device, can precisely adjust the speed according to actual needs; compared with the traditional AC motor, it can greatly reduce unnecessary energy loss, effectively reduce energy consumption, and save users considerable electricity expenses in the long term.

[0098] (2) In terms of operational stability, the DC brushless motor has a simple structure and no mechanical friction between the brush and the commutator, which reduces the probability of failure and extends the service life of the motor. At the same time, each drive device independently controls the corresponding motor, making the system operation more stable and reliable, and reducing the risk of air conditioner shutdown due to motor failure.

[0099] (3) In terms of noise control, the DC brushless motor operates smoothly, significantly reducing vibration and noise. Whether it is day or night, it can create a quiet and comfortable indoor environment for users, improving the user experience;

[0100] (4) The electrical connection design makes the components work together more efficiently; the control box can respond quickly and accurately regulate the operation of each motor to achieve rapid cooling and heating, and the temperature control accuracy is higher, which can better meet the user's personalized needs for indoor temperature and bring the user a high-quality air conditioning experience.

[0101] (5) The air conditioner compressor motor, outdoor fan motor and indoor fan motor have all been replaced with DC brushless motors and equipped with corresponding drive devices, making the use of air conditioners more reliable and providing hardware conditions for the next step of intelligent management of air conditioners. It can be widely applied to railway locomotive fields, etc.

[0102] This utility model has been described based on specific embodiments, but those skilled in the art will understand that various changes and equivalent substitutions can be made without departing from the scope of this utility model. Furthermore, to adapt to specific applications of this utility model, numerous modifications can be made without departing from its protection scope. Therefore, this utility model is not limited to the specific embodiments disclosed herein, but includes all embodiments falling within the protection scope of the claims.

Claims

1. A direct current air conditioner comprising an outdoor unit and a control box, characterized in that, The outdoor unit is equipped with a first brushless DC motor, and the control box is equipped with a second brushless DC motor and a third brushless DC motor. The first brushless DC motor is equipped with a first drive device, the second brushless DC motor is equipped with a second drive device, and the third brushless DC motor is equipped with a third drive device. The outdoor unit, the first brushless DC motor, the control box, the second brushless DC motor, the third brushless DC motor, the first drive device, the second drive device, and the third drive device are electrically connected.

2. The air conditioner according to claim 1, wherein The first drive device includes a first power conversion unit, a first control processing unit, and a first protection monitoring unit that are electrically connected.

3. The air conditioner according to claim 1, wherein The second drive device includes a second power conversion unit, a second control processing unit, and a second protection monitoring unit that are electrically connected.

4. The air conditioner according to claim 1, wherein The third drive unit includes a third power conversion unit, a third control processing unit, and a third protection monitoring unit that are electrically connected.

5. The DC air conditioner according to claim 2, characterized in that, The first power conversion unit includes a first rectifier circuit, a first inverter circuit, and a first DC bus capacitor that are electrically connected.

6. The DC air conditioner according to claim 2, characterized in that, The first control processing unit includes a first microcontroller, a first position sensor, and a first driver chip that are electrically connected.

7. The DC air conditioner according to claim 2, characterized in that, The first protection monitoring unit includes a first current detection module, a first voltage detection module, and a first temperature protection module that are electrically connected.

8. The DC air conditioner according to claim 5, characterized in that, The first rectifier circuit adopts the VIENNA rectifier topology, which includes a three-phase full-bridge structure composed of 6 IGBT modules.

9. The DC air conditioner according to claim 5, characterized in that, The first inverter circuit includes: two IGBTs configured in each phase to form an H-bridge structure, and a total of six IGBTs configured in the three phases to form the inverter main circuit.

10. The DC air conditioner according to claim 6, characterized in that, The first microcontroller includes a TMS320F28335.

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