A fresh air air conditioner controller and a fresh air air conditioner system with a dual external drive circuit

Abstract

The present invention mainly relates to the control field of fresh air air conditioners. In order to solve the problems that the reliability of the driver is reduced due to the installation of the drive controllers of the DC fan motor and the fresh air replacement motor of the air conditioner inside the motor in the air conditioner with the fresh air replacement function, and the contradiction between the fire prevention of the air conditioner controller and the heat dissipation of the switching power supply, the present invention provides a fresh air air conditioner controller and a fresh air air conditioner system with a dual external drive circuit, transferring the drive circuits in the air conditioner DC fan motor and the fresh air replacement motor from the motor to the main board of the controller. Four MCUs are installed in the main board of the controller to control the fresh air air conditioner system: the first strong power MCU drives the air conditioner DC bare motor through the first IPM drive circuit, the second strong power MCU drives the fresh air DC bare motor through the second IPM drive circuit, the first weak power MCU controls the strong power MCU and circuits such as the electric auxiliary heating module outside the controller main board, and the second weak power MCU controls the weak power circuits on the display board.

Description

Technical Field

[0001] The present invention mainly relates to the control field of fresh air air conditioners, and particularly relates to a fresh air air conditioner controller with a dual external drive circuit and a fresh air air conditioner system. Background Art

[0002] If an air conditioner is used for a long time in a closed environment, the oxygen content in the room decreases, and the concentrations of carbon dioxide and other harmful gases increase, which will lead to a decrease in user comfort and is also not conducive to physical health. Therefore, some air conditioners have added a fresh air exchange function, that is, a fresh air exchange motor is added to suck fresh air from the outside through a pipeline and discharge it into the room to increase the oxygen content.

[0003] For the indoor unit controller of an air conditioner with a fresh air exchange function, it is necessary to control two fan motors: the DC fan motor of the air conditioner indoor unit itself and the fresh air exchange motor. Due to the limited area of the main board of the air conditioner indoor unit, most of the current fresh air air conditioners on the market generally adopt dual built-in DC motors, that is, the drive controllers of the DC fan motor of the air conditioner itself and the fresh air exchange motor are respectively built into the motors by the motor manufacturers, which brings three disadvantages:

[0004] 1. The drive controller of the motor is sealed inside the motor, which is greatly affected by the motor heat and the reliability is reduced.

[0005] 2. The added value of the motor is high, and the procurement price of the motor by the air conditioner manufacturer is relatively high.

[0006] 3. There is a contradiction between the fire prevention of the air conditioner controller and the heat dissipation of the switching power supply.

[0007] In order to prevent electrical fires, the electric control box for installing the main board of the air conditioner controller is generally designed as a sealed structure. In this way, even if there is an electronic component fire on the main board, because the electric control box is sealed and there is a lack of oxygen inside, and all components use flame-retardant materials, the fire on the main board will soon go out. For the fresh air exchange DC motor, generally +12V or other low-voltage DC motors are currently used. The motor power is relatively large. For example, the rated power of the fresh air exchange DC motor for a wall-mounted unit is generally 14W - 20W. Adding other loads such as the air deflector stepping motor, the compressor relay, and the electric heating relay, the total power of the switching power supply of the air conditioner controller generally reaches more than 40W, which will cause the switching power supply chip to generate a large amount of heat. If the temperature of the power supply chip is too high, it is easy to form over-temperature protection or reduce the reliability of the power supply chip. To solve the heat dissipation problem, some manufacturers drill holes in the electric control box for heat dissipation. However, this leads to potential safety hazards. Once the controller catches fire, the flames will escape from the heat dissipation holes of the electric control box, expanding the fire. Summary of the Invention

[0008] The technical problems to be solved by the present invention:

[0009] The present invention provides a fresh air air conditioner controller and a fresh air air conditioner system with a dual external drive circuit, which solve the problems brought about by integrating the drive controllers of the DC fan motor and the fresh air motor of the air conditioner inside the motor in an air conditioner with a fresh air replacement function.

[0010] The technical solution adopted by the present invention to solve the above problems is as follows:

[0011] On the one hand, the present invention provides a fresh air air conditioner controller with a dual external drive circuit, including a controller main board and a display board.

[0012] The controller main board can adopt two circuit structures and connection methods.

[0013] The first circuit structure and connection method of the controller main board are as follows:

[0014] The controller main board includes a rectifier circuit, a filter circuit, a switching power supply, a voltage detection circuit, a first current detection circuit, a second current detection circuit, a first IPM drive circuit, a second IPM drive circuit, a first strong power MCU, a second strong power MCU, a first weak power MCU, a first isolation circuit and a second isolation circuit.

[0015] The input end of the rectifier circuit is connected to the power input end, and the output end of the rectifier circuit is connected to the input end of the filter circuit; the output end of the filter circuit is connected to the first IPM drive circuit, the second IPM drive circuit and the switching power supply.

[0016] The first current detection circuit is arranged between the first IPM drive circuit and the strong power ground; the second current detection circuit is arranged between the second IPM drive circuit and the strong power ground.

[0017] The first IPM drive circuit is connected to the first strong power MCU, and the second IPM drive circuit is connected to the second strong power MCU.

[0018] The voltage detection circuit detects the voltage at the output end of the filter circuit and inputs the detected voltage value to the first strong power MCU and the second strong power MCU.

[0019] The first weak power MCU communicates with the first strong power MCU through the first isolation circuit and communicates with the second strong power MCU through the second isolation circuit.

[0020] The second circuit structure and connection method of the controller main board are as follows:

[0021] The controller main board includes a rectifier circuit, a filter circuit, a switching power supply, a voltage detection circuit, a first current detection circuit, a second current detection circuit, a first IPM drive circuit, a second IPM drive circuit, a first strong power MCU, a second strong power MCU, a first weak power MCU, a first isolation circuit.

[0022] The input end of the rectifier circuit is connected to the power input end, and the output end of the rectifier circuit is connected to the input end of the filter circuit; the output end of the filter circuit is connected to the first IPM drive circuit, the second IPM drive circuit, and the switching power supply;

[0023] The first current detection circuit is arranged between the first IPM drive circuit and the strong power ground; the second current detection circuit is arranged between the second IPM drive circuit and the strong power ground;

[0024] The first IPM drive circuit is connected to the first strong power MCU, and the second IPM drive circuit is connected to the second strong power MCU;

[0025] The voltage detection circuit detects the voltage at the output end of the filter circuit and inputs the detected voltage value to the first strong power MCU and the second strong power MCU;

[0026] The first weak power MCU communicates with the first strong power MCU through the first isolation circuit, and the second strong power MCU is connected to the first strong power MCU.

[0027] Further, the display board includes a second weak power MCU, a gas sensor, a buzzer, a remote control receiving module, an emergency switch, a display screen, a WiFi module, and a temperature and humidity sensor; the second weak power MCU is connected to the gas sensor, the buzzer, the remote control receiving module, the emergency switch, the display screen, the WiFi module, and the temperature and humidity sensor, and communicates with the first weak power MCU in the controller main board.

[0028] Further, the switching power supply includes a strong power output end and a weak power output end. The power input ends of the first strong power MCU, the second strong power MCU, the first IPM drive circuit, the second IPM drive circuit, the first current detection circuit, the second current detection circuit, and the voltage detection circuit are connected to the strong power output end of the switching power supply, and the grounding end is connected to the strong power ground; the power input ends of the first weak power MCU and the second weak power MCU, the air deflector motor, the coil temperature sensor, and all circuits in the display board are connected to the weak power output end of the switching power supply, and the grounding end is connected to the weak power ground of the switching power supply.

[0029] On the other hand, the present invention also provides a fresh air air conditioner system with a double external drive circuit, including a fresh air DC bare motor, an air conditioner DC bare motor, an outdoor communication module, an electric auxiliary heating module, an air deflector motor, a coil temperature sensor, and also including the fresh air air conditioner controller with the double external drive circuit; the controller main board is connected to the outdoor communication machine module, the electric auxiliary heating module, the air deflector motor, and the coil temperature sensor through the first weak power MCU, is connected to the air conditioner DC bare machine through the first IPM drive circuit, and is connected to the fresh air DC bare motor through the second IPM drive circuit.

[0030] The beneficial effects of the present invention are:

[0031] The drive circuits of the air conditioner's DC fan motor and fresh air DC motor are externalized and designed on the air conditioner controller mainboard, which improves the reliability of the drive circuit, enhances the performance of the motor, and can also reduce the purchase price of the motor, thus saving costs. The DC motor uses DC310V high-voltage power supply and no longer requires +12V or other low-voltage power supply, which can greatly reduce the power of the switching power supply and solve the contradiction between the fire protection of the air conditioner controller and the heat dissipation of the switching power supply. Some weak-current circuits installed on the air conditioner mainboard are transferred to the display board, solving the problem of insufficient area on the air conditioner mainboard and inability to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the circuit connection method of a fresh air air conditioning system with dual external drive circuits provided in Example 1.

[0033] Figure 2 This is a schematic diagram of the circuit connection method of a fresh air air conditioning system with dual external drive circuits provided in Example 2.

[0034] Figure 3 It is a connection diagram of the first IPM driving circuit and the first high-power MCU. DETAILED DESCRIPTION

[0035] The present invention provides a fresh air air conditioning controller and a fresh air air conditioning system with dual external drive circuits, wherein the drive control circuits of the air conditioning DC fan motor and the air conditioning fresh air motor are transferred to the controller mainboard, and four MCUs are used to respectively control the air conditioning DC bare motor, the fresh air DC bare motor, the display board and other circuits outside the controller mainboard, and at the same time, the weak current components on the air conditioning controller mainboard are transferred to the display board.

[0036] The present invention provides two embodiments for reference.

[0037] Embodiment 1:

[0038] like Figure 1 As shown, the fresh air air conditioning system with dual external drive circuits described in the present invention includes the fresh air air conditioning controller with dual external drive circuits described in the present invention, and also includes a fresh air DC bare motor, an air conditioning DC bare motor, an outdoor communication module, an electric auxiliary heating module, an air guide swing blade motor, and a coil temperature sensor. The controller mainboard is connected to the display board, the outdoor communication module, the electric auxiliary heating module, the air guide swing blade motor, and the coil temperature sensor through the first weak current MCU4, connected to the air conditioning DC bare motor through the first IPM drive circuit 9, and connected to the fresh air DC bare motor through the second IPM drive circuit 10.

[0039] The described fresh air air conditioner controller with a dual external drive circuit includes a controller main board and a display board. The controller main board includes a rectifier circuit 1, a filter circuit 2, a switching power supply 3, a first weak current MCU 4, a first isolation circuit 5, a second isolation circuit 6, a first strong current MCU 7, a second strong current MCU 8, a first IPM drive circuit 9, a second IPM drive circuit 10, a first current detection circuit 11, a second current detection circuit 12, and a voltage detection circuit 13.

[0040] The input current is rectified by the rectifier circuit 1 and filtered by the filter circuit 2 to output high-voltage direct current. On the one hand, the high-voltage direct current directly supplies power to the air conditioner DC bare motor through the first IPM drive circuit 9 and supplies power to the fresh air DC bare motor through the second IPM drive circuit 10. On the other hand, it provides an input voltage to the switching power supply 3, and the switching power supply 3 has both a strong current output terminal and an isolated weak current output terminal.

[0041] The isolation circuit divides the controller main board into a strong current area and a weak current area. The power input terminals of the first strong current MCU 7, the second strong current MCU 8, the first IPM drive circuit 9, the second IPM drive circuit 10, the first current detection circuit 11, the second current detection circuit 12, and the voltage detection circuit 13 are connected to the strong current output terminal of the switching power supply 3, and the grounding terminals are connected to the strong current ground. The power input terminals of the first weak current MCU 4, the air deflector blade motor, the coil temperature sensor, and the weak current circuit in the display board are connected to the weak current output terminal of the switching power supply 3, and the grounding terminals are connected to the weak current ground output by the switching transformer. The voltage of the strong current output terminal of the switching power supply 3 is +5V_A, and the strong current ground is connected to the zero line through the rectifier circuit. The weak current output terminal is +5V_B, and its reference ground is the weak current ground isolated and output by the switching transformer.

[0042] The first weak current MCU 4 communicates with the first strong current MCU 7 through the first isolation circuit 5, and the first weak current MCU 4 communicates with the second strong current MCU 8 through the second isolation circuit 6. The first strong current MCU 7 controls the first IPM drive circuit 9 of the air conditioner DC fan motor, the second strong current MCU 8 controls the second IPM drive circuit 10 of the fresh air DC motor, the first IPM drive circuit 9 drives the air conditioner DC bare motor to operate, and the second IPM drive circuit 10 drives the fresh air DC bare motor to operate.

[0043] A first current detection circuit 11 is provided between the first IPM drive circuit 9 and the strong current ground to detect the phase current of the air conditioner DC bare motor and input the current value to the first strong current MCU 7. A second current detection circuit 12 is provided between the second IPM drive circuit 10 and the strong current ground to detect the phase current of the fresh air DC bare motor and input the current value to the second strong current MCU 8.

[0044] A voltage detection circuit 13 is connected to the high-voltage DC bus to detect the bus voltage and input the voltage value to the first high-power MCU 7 and the second high-power MCU 8. To save space on the controller main board, the first IPM drive circuit 9 and the second IPM drive circuit 10 can share a bus voltage detection circuit.

[0045] A second low-power MCU 14 and various low-power control devices are provided on the display board, including a buzzer, a light detector, a room temperature sensor, a WIFI communication module, and a remote control receiver. Other low-power components or circuits such as a carbon dioxide detector and a dust detector can also be installed on the display board according to actual needs. The second low-power MCU 14 controls the remaining low-power control devices on the display board. At the same time, the second low-power MCU 14 is connected to the first low-power MCU 4.

[0046] As Figure 3 shown, the fault output terminal FO1 of the first IPM drive circuit 9 is connected to the IPM module circuit fault input terminal FO2 of the first high-power MCU 7, the temperature output terminal VTH1 is connected to the IPM module circuit temperature input terminal VTH2 of the first high-power MCU 7, the W-phase sampled current output terminal IW_AD1 is connected to the W-phase sampled current input terminal IW_AD2 of the first high-power MCU 7, the U-phase sampled current output terminal IU_AD1 is connected to the U-phase sampled current input terminal IU_AD2 of the first high-power MCU 7, the U-phase high-side signal input terminal INuh is connected to the U-phase high-side signal output terminal UP of the first high-power MCU 7, the V-phase high-side signal input terminal INvh is connected to the V-phase high-side signal output terminal VP of the first high-power MCU 7, the W-phase high-side signal input terminal INwh is connected to the W-phase high-side signal output terminal WP of the first high-power MCU 7, the U-phase low-side signal input terminal INul is connected to the U-phase low-side signal output terminal UN of the first high-power MCU 7, the V-phase low-side signal input terminal INvl is connected to the V-phase low-side signal output terminal VP of the first high-power MCU 7, and the W-phase low-side signal input terminal INwl is connected to the W-phase low-side signal output terminal WP of the first high-power MCU 7.

[0047] If the second IPM drive circuit 10 uses the same model specification as the first IPM drive circuit 9, the connection method of the second IPM drive circuit 10 and the Figure 3 second high-power MCU 8 is exactly the same. At the same time, different IPM drive circuits can be selected according to the power of the air-conditioning DC bare motor and the fresh-air DC bare motor, and the connection method can be changed accordingly according to the selected different IPM drive circuits.

[0048] The U-phase signal output terminal of the first IPM drive circuit 9 is used to connect to the U-phase signal input terminal of the air-conditioning DC bare motor, the V-phase signal output terminal is used to connect to the V-phase signal input terminal of the DC bare wire fan motor, and the W-phase signal output terminal is used to connect to the W-phase signal input terminal of the DC bare wire fan motor.

[0049] The connection manner between the second IPM drive circuit 10 and the fresh air DC bare motor is the same as that between the first IPM drive circuit 9 and the air conditioner DC bare motor.

[0050] Embodiment 2:

[0051] As Figure 2 shown, the controller main board may also adopt a second circuit structure and connection manner, omitting the second isolation circuit 6. The second strong power MCU 8 is directly connected to the first strong power MCU 7 for communication, sharing the first isolation circuit 5. The remaining circuit structures and connection manners of the fresh air air conditioner system of the present invention are the same as those in Embodiment 1.

Claims

1. A fresh air air conditioner controller with a dual external drive circuit, comprising a controller main board and a display board, Characterized in that: The controller main board includes a rectification circuit, a filtering circuit, a switching power supply, a voltage detection circuit, a first current detection circuit, a second current detection circuit, a first IPM drive circuit, a second IPM drive circuit, a first strong power MCU, a second strong power MCU, a first weak power MCU, a first isolation circuit and a second isolation circuit; The input end of the rectification circuit is connected to the power input end, and the output end of the rectification circuit is connected to the input end of the filtering circuit; the output end of the filtering circuit is connected to the first IPM drive circuit, the second IPM drive circuit and the switching power supply; The first current detection circuit is arranged between the first IPM drive circuit and the strong power ground; the second current detection circuit is arranged between the second IPM drive circuit and the strong power ground; The first IPM drive circuit is connected to the first strong power MCU, and the second IPM drive circuit is connected to the second strong power MCU; The voltage detection circuit detects the voltage at the output end of the filtering circuit and inputs the detected voltage value to the first strong power MCU and the second strong power MCU; The first weak power MCU communicates with the first strong power MCU through the first isolation circuit and communicates with the second strong power MCU through the second isolation circuit.

2. A fresh air air conditioner controller with a dual external drive circuit, comprising a controller main board and a display board, Characterized in that: The controller main board includes a rectification circuit, a filtering circuit, a switching power supply, a voltage detection circuit, a first current detection circuit, a second current detection circuit, a first IPM drive circuit, a second IPM drive circuit, a first strong power MCU, a second strong power MCU, a first weak power MCU, a first isolation circuit; The input end of the rectification circuit is connected to the power input end, and the output end of the rectification circuit is connected to the input end of the filtering circuit; the output end of the filtering circuit is connected to the first IPM drive circuit, the second IPM drive circuit and the switching power supply; The first current detection circuit is arranged between the first IPM drive circuit and the strong power ground; the second current detection circuit is arranged between the second IPM drive circuit and the strong power ground; The first IPM drive circuit is connected to the first strong power MCU, and the second IPM drive circuit is connected to the second strong power MCU; The voltage detection circuit detects the voltage at the output end of the filtering circuit and inputs the detected voltage value to the first strong power MCU and the second strong power MCU; The first weak power MCU communicates with the first strong power MCU through the first isolation circuit, and the second strong power MCU is connected to the first strong power MCU.

3. The fresh air air conditioner controller with a dual external drive circuit according to any one of claims 1-2, Characterized in that: The display board includes a second weak power MCU, a gas sensor, a buzzer, a remote control receiving module, an emergency switch, a display screen, a WiFi module, a temperature and humidity sensor; the second weak power MCU is connected to the gas sensor, the buzzer, the remote control receiving module, the emergency switch, the display screen, the WiFi module, the temperature and humidity sensor and communicates with the first weak power MCU in the controller main board.

4. The fresh air air conditioner controller with a dual external drive circuit according to claim 3, characterized in that: The switching power supply includes a strong power output terminal and a weak power output terminal. The power input terminals of the first strong power MCU, the second strong power MCU, the first IPM drive circuit, the second IPM drive circuit, the first current detection circuit, the second current detection circuit and the voltage detection circuit are connected to the strong power output terminal of the switching power supply, and the grounding terminal is connected to the strong power ground; the power input terminals of the first weak power MCU and the second weak power MCU, the air deflector motor, the coil temperature sensor and the circuit in the display board are connected to the weak power output terminal of the switching power supply, and the grounding terminal is connected to the weak power ground of the switching power supply.

5. A fresh air air conditioner system with a dual external drive circuit, comprising a fresh air DC bare motor, an air conditioner DC bare motor, an outdoor communication module, an electric auxiliary heating module, an air deflector motor, a coil temperature sensor, characterized in that: It further includes a fresh air air conditioner controller with a dual external drive circuit according to any one of claims 1-4; the controller main board is connected to the outdoor communication machine module, the electric auxiliary heating module, the air deflector motor and the coil temperature sensor through the first weak power MCU, and is connected to the air conditioner DC bare machine through the first IPM drive circuit and to the fresh air DC bare motor through the second IPM drive circuit.

Images