HVAC (heating ventilation and air conditioning) control system of household central air conditioner

Abstract

An HVAC control system of a household central air conditioner comprises an HVAC system controller, a centrifugal blower motor, a compressor motor, and an axial fan motor. The HVAC system controller comprises an HVAC microprocessor, a sensor, a motor control interface unit, and a power supply portion. The power supply portion supplies power for circuits of various parts. The sensor sends a detection signal to the HVAC microprocessor through a signal processing circuit. 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. The motor control interface unit comprises an inverter unit and a rotor position detection unit. The HVAC 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 HVAC microprocessor for processing.

Description

Technical field: [0001] The invention relates to an HVAC control system of a household central air conditioner. Background technique: [0002] A kind of household central air conditioner that installs compressors, condensers, evaporators, throttling devices, and blowers in one shell to form an independent unit with complete functions. Its control structure is as follows: figure 1 As shown, including the HVAC system controller, centrifugal blower motor, compressor motor, axial fan motor and gas induced draft fan motor, the HVAC system controller controls four motors, and the thermostat HERMOSTAT establishes communication with the HVAC system controller. [0003] In recent years, with the increasingly fierce competition in the field of electrical appliances, the technical requirements for products have been continuously improved, such as energy saving and environmental protection, high controllability, intelligent controllability, short development cycle, and low noise. As th...

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 power consumption. High performance, high noise, low degree of controllability and intelligence

[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 achieve 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 Motor motors and compressor motors have already used permanent magnet synchronous motors, such as figure 2 As shown, the HVAC microprocessor is connected to the motor controller through the motor control interface unit. In the figure, the axial flow fan motor is an AC motor without a motor controller. In the existing technical scheme, the motor of the centrifugal blower and the motor of the compressor Each motor controller has an independent motor controller, and each motor controller is equipped with a power supply part, a microprocessor, an inverter circuit and a motor operating parameter detection unit, so that the entire control part circuit is overlapped, the structure is complicated, and the HVAC cannot be fully utilized. The hardware and software resources in the system controller will inevitably lead to a great increase in product cost 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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