Hello I have tow circuit about 'PWM DC motor speed control' and i want to know which one is more stable
my motor spec is 24v/4a (more than 2A less than 4A) for running fan.
here is circuit
CIRCUIT A)
AVR PWM -> ATMEGA128 or ATMEGA series
R1 -> to gate
R2 -> for fully off
D1 -> 1N5401 (3A 100V)
CIRCUIT B)
AVR PWM -> ATMEGA128 or ATMEGA series
R1 -> to TR
R2 -> for fully off
R3 -> (for protect NPN ?)
R4 -> to gate
D1 -> 1N5401 (3A 100V)
C5 -> filtering High frequency (0.1uF -> 1000uF)
I think 'B' is better than 'A' becase using two TR, 7805 and IRF540 will have less heat
but circuit 'A' is more simple.
so this is my question.
1. which one is more efficient 'A' with heatsink, 'B' without heatsink?
2. If i take 'B' is these R value is fit to this circuit?
my motor spec is 24v/4a (more than 2A less than 4A) for running fan.
here is circuit
CIRCUIT A)
AVR PWM -> ATMEGA128 or ATMEGA series
R1 -> to gate
R2 -> for fully off
D1 -> 1N5401 (3A 100V)
CIRCUIT B)
AVR PWM -> ATMEGA128 or ATMEGA series
R1 -> to TR
R2 -> for fully off
R3 -> (for protect NPN ?)
R4 -> to gate
D1 -> 1N5401 (3A 100V)
C5 -> filtering High frequency (0.1uF -> 1000uF)
I think 'B' is better than 'A' becase using two TR, 7805 and IRF540 will have less heat
but circuit 'A' is more simple.
so this is my question.
1. which one is more efficient 'A' with heatsink, 'B' without heatsink?
2. If i take 'B' is these R value is fit to this circuit?
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