The structure of Hisense KFR-25GW-06BP inverter air conditioner outdoor unit microprocessor control circuit

Shown is the structure of the outdoor unit microprocessor control circuit. As can be seen from the figure, 1C01 is the main control microprocessor. Its pin number
and function code are marked next to the pin. You can compare this figure with Figure 25-30 , so as to clarify the circuit structure and working principle.
    The functions of the main pins of the outdoor unit are as follows:
    ②Pin: The signal input terminal of the compressor temperature detection sensor (marked THERMO).
    @～@pin; the LED displays the drive signal output terminal. When a certain pin appears low level, +5 V current flows through the LED
, and the LED indicates the working status.
    @Pin: AC input voltage detection terminal (VT), AC 220 V outputs DC voltage after rectification and filtering. While supplying power to the compressor motor
drive circuit, it is divided by the voltage dividing resistor and sent to the microprocessor as a sampling point. @ pin of the device. If the voltage of @ pin is abnormal,
it indicates that the AC input voltage is abnormal. , the emblem processor will take shutdown protection measures to prevent device damage.
    ⑦Pin: Outdoor temperature detection terminal (OUT AIR).
    @Pin: Coil temperature detection end (DEF).
    @Finger: The exhaust pipe temperature is at the end (COMP).
    ⑩Pin: Current detection terminal of the variable frequency power module. In the variable frequency control circuit , there is a current detection resistor in the current channel of the power module.
The size of the current will be reflected by the voltage drop on the resistor. If the voltage on the resistor rises, it indicates that the power If the module's current is overloaded, the microprocessor
will immediately take current limiting or protective measures.
    @@@@pin; it is the +5 V power supply terminal.
    @@pin: Communication interface with the indoor microprocessor
to exchange information.     @foot: test end (TEST).
    @foot: reset end.
    @@Pin: Crystal oscillator interface, external quartz crystal X401 (4 MHZ).
    @@Pin: outdoor fan motor drive end.
    @pin: four-way electromagnetic coil driving end,
    @pin: PCT,
    @~@pin: variable motor drive signal output end, used to drive the compressor motor drive circuit (power module).
    @@Pin: External memory (EzPROM) interface.
    @@Pin: FLASH interface.