POWER METAL OXIDE SEMICONDUCTOR FIELD EFFECT TRANSISTOR (POWER MOS FET) FUNCTION

id074000101100


Function

•  Controls the supply voltage to the blower motor according to the gate voltage sent from the climate control unit and adjusts the rotation speed (airflow volume).
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Power MOS FET
2
Blower relay
3
Blower motor
4
Gate voltage
5
Climate control unit


Construction/Operation

•  There are three electrodes: source, gate, and drain electrodes.
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Gate
2
Drain
3
Source

•  The resistance between terminals B and A (between drain and source) changes according to the voltage (gate voltage) applied to terminal E (gate).
•  When the gate voltage increases, the resistance between terminals B and A decreases, allowing the current to flow easily.
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1
Small current
2
Low gate voltage
3
Large current
4
High gate voltage