System for controlling split units of household central air conditioner

Abstract

A control system of a heating, ventilation and air conditioning system comprises an indoor unit controller, an outdoor unit controller, a centrifugal blower motor, a compressor motor, and an axial fan motor. The indoor unit controller comprises an indoor unit microprocessor, a sensor, a first motor control interface unit, and a first power supply portion. The first power supply portion supplies power for circuits of various parts of the indoor unit controller. The sensor sends a detection signal to the indoor unit microprocessor through a signal processing circuit. The outdoor unit controller comprises an outdoor unit microprocessor, a second motor control interface unit, and a second power supply portion. The second power supply portion supplies power for circuits of various parts of the outdoor unit controller. The outdoor unit microprocessor controls the compressor motor and the axial fan motor through the second motor control interface unit. The indoor unit microprocessor controls the centrifugal blower motor through the first motor control interface unit. At least one of the centrifugal blower motor, the compressor motor and the axial fan motor is a permanent magnet synchronous motor without a motor controller. At least one inverter unit and one rotor position detection unit are provided in the first motor control interface unit and the second motor control interface unit. The indoor unit microprocessor or the outdoor unit microprocessor drives the permanent magnet synchronous motor without the motor controller through the inverter unit. The rotor position detection unit sends a rotor position signal of the permanent magnet synchronous motor without the motor controller to the indoor unit microprocessor or the outdoor unit microprocessor. In the control system, overlapped circuit configuration is omitted, thereby simplifying the circuit structure, and reducing the product cost.

Description

Technical field: [0001] The invention relates to a control system of a household central air conditioner split machine. Background technique : [0002] A household central air-conditioning split unit system (HVAC system), including an indoor unit and an outdoor unit, which are connected by a data line, and the communication distance between the indoor unit and the outdoor unit is more than 25 meters. The condenser, throttling device, and axial fan are installed in an external unit, and the condenser and centrifugal blower motor are installed in the inner unit. In order to control stability, the inner unit and the outer unit have independent controllers and are connected through a communication bus. That is, the controller of the internal machine and the controller of the external machine, and its control structure is as follows: figure 1 As shown, the internal machine controller includes the internal machine microprocessor, the external machine controller includes the exter...

AI Technical Summary

Problems solved by technology

As the core component—the motor, it will undoubtedly become the key component to solve the above technical problems. The centrifugal blower motor and compressor motor in the traditional household central air conditioner use single-phase AC motor PSC, single-phase AC motor, low efficiency and relatively energy consumption , The noise is also large, and the degree of controllability is low

[0004] With the development of motor technology, a permanent magnet synchronous motor has appeared. This kind of motor must have a motor controller, and the motor controller is used to realize the purpose of electronic commutation of the current. Therefore, some people in the industry also call it ECM motor (electronically commutated motor) for short. , The permanent magnet synchronous motor has the characteristics of energy saving and environmental protection, high reliability and controllability, low noise, and easy realization of intelligence, etc., which can solve the shortage of AC motors. Therefore, the centrifugal blower in the existing household central air conditioner Motors and compressor motors have already used permanent magnet synchronous motors. Each permanent magnet synchronous motor has an independent motor controller. Each motor controller includes an independent power supply, microprocessor, inverter unit and rotor position detection. unit, such as image 3 As shown, the microprocessor of the internal machine and the microprocessor of the external machine are connected with the motor controller through the motor control interface unit, image 3 The axial flow fan motor and the gas induced draft fan motor are AC motors without motor controllers. In the existing technical solutions, the centrifugal blower motors and compressor motors are equipped with independent motor controllers. Each motor controller The power supply part, microprocessor, inverter circuit and motor operating parameter detection unit are all set, so the circuit of the entire control part is overlapped and configured, the structure is complicated, and the hardware and software resources in the internal machine controller and external machine controller cannot be fully utilized. , will inevitably lead to a great increase in product costs and a waste of resources

In addition, due to the limited layout space of the motor controller, heat dissipation becomes a more difficult problem

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