third
The third section is the INVERTER consisting of IGBT transistors
This section generates 3 phase voltage supply to the DC compressor motor. In the initial design, the designers used six discrete IGBT transistors which are controlled by the microcomputer.
The software is written in such a way that proper signals are being used to power ON or OFF each transistors at a correct timing depending on the feedback such as the position of the rotors in relation to the stator motor and the voltage levels detected.
The brushless DC motor of the compressor will receive close to a 3 phase sinusoidal voltage that turns the motor ON. The speed of the motor can be controlled from low to high by varying the power supplied to the motor through the switching of the transistors. In this way, capacity controlled HVAC can be achieved. When cooling or heating is needed immediately, the motor will turn at the highest speed. When the temperature of the room has stabilized, the motor will turn at a lower speed.
Newer design makes use of power modules known as IPM or Intelligent Power Modules where the 6 IGBT transistors, detection circuit, overload conditions and other parameters are being built in an encapsulated casing. It looks like an integrated circuit except that it is very much bigger in size.
This section generates 3 phase voltage supply to the DC compressor motor. In the initial design, the designers used six discrete IGBT transistors which are controlled by the microcomputer.
The software is written in such a way that proper signals are being used to power ON or OFF each transistors at a correct timing depending on the feedback such as the position of the rotors in relation to the stator motor and the voltage levels detected.
The brushless DC motor of the compressor will receive close to a 3 phase sinusoidal voltage that turns the motor ON. The speed of the motor can be controlled from low to high by varying the power supplied to the motor through the switching of the transistors. In this way, capacity controlled HVAC can be achieved. When cooling or heating is needed immediately, the motor will turn at the highest speed. When the temperature of the room has stabilized, the motor will turn at a lower speed.
Newer design makes use of power modules known as IPM or Intelligent Power Modules where the 6 IGBT transistors, detection circuit, overload conditions and other parameters are being built in an encapsulated casing. It looks like an integrated circuit except that it is very much bigger in size.
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