POWER TRANSISTOR OPERATION


BHE074061020T01

1. The A/C amplifier calculates the rotation speed of the blower motor based on input from each switch and sensor and the set temperature.

2. The calculated rotation speed is changed to a drive signal (pulse) and is output to the power transistor.

3. The power transistor that receives the signal determines the drive voltage required to operate the motor based on the rotation speed output from the A/C amplifier and outputs it to the power MOS FET.

4. The blower motor rotates at the same time the power MOS FET operates.

1
A/C amplifier
2
Power transistor
3
Power MOS FET
4
Blower relay
5
Blower motor
6
Drive power
7
Input signal processing
8
Sensor switch
9
Pulse output
10
Voltage output
11
Blower motor operation