Gree inverter air conditioner control circuit composition and function

First, the function of each circuit

1, strong electric filter circuit:

Located at the front of the external control panel, consists of fuses, varistors, discharge tubes, safety capacitors, common mode differential mode inductors, oxide film resistors, etc., used for industrial frequency AC power supply filtering, with PTC resistor current limiting protection, and A surge absorption circuit filters out high-voltage interference;

2, rectifier filter circuit:

The high-power rectifier bridge machine is composed of high-voltage and large-capacity electrolytic capacitors. The industrial frequency AC power supply is rectified and filtered into a DC power supply for subsequent circuit power supply.

3, PFC circuit:

It is composed of large inductance, high power IGBT and its control and protection circuit. It is used to improve the power factor of the whole machine, reduce the harmonic interference to the power grid and has a boosting effect.

4, IPM inverter circuit:

It is composed of IPM module and its control, protection and detection circuit. Under the control of DSP, through the IPM module, the rectified and boosted DC voltage is converted into a controllable three-phase AC power supply to the permanent magnet synchronous motor of the compressor. In order to achieve the purpose of adjusting the speed of the compressor;

5, switching power supply circuit:

The use of a switching power supply chip periodically controls the on-off of internal switching devices to adjust the stable low-voltage voltage source required for output to provide back-end operating voltages for various chips, relays, and temperature sensing packages;

6, temperature detection circuit:

Use various kinds of temperature-sensing package to collect the corresponding temperature so that the DSP can make corresponding calculation and control according to the specific environment, and output the protection signal in time when abnormal conditions are detected;

7, communication circuit:

It is composed of outdoor communication transmission and reception circuits and indoor and outdoor connection lines. It is used for communication between internal and external devices. It transmits the internal machine detection temperature and set temperature signals to the external machine for processing, and the external machine processing results and Protection status is transmitted to the internal machine display;

8, fan, four-way valve control circuit:

Outer fans and four-way valves and other components coordinated control.

Second, all kinds of plate structure distribution and detection

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