555 PWM circuit
- From: Vicente <uchan@xxxxxxx>
- Date: Sun, 18 Nov 2007 08:26:31 -0800 (PST)
Hi,
I've build a PWM control following this design:
http://www.pablin.com.ar/electron/circuito/varios/pwm-cc/index.htm
But I made some changes:
1. I don't know what the 10uF capacitor is used for, so I am not using
it.
2. As I want to use a high current motor (10A), I've changed:
2.1: IN5408 > BY229-600
2.2: IRF830 > BUZ11 with HEATSINK
3. I guess that the 1K resistor in the BUZ11 gate is used to discharge
the internal capacitor of the transistor (avoid over-heating), but if
I use it there is no current in the MOTOR
4. Capacitors on pin 6 and 5 are 10nF instead of 100 nF
I will use a 12v 10A motor, and a 12v 20Ah battery, but for testing
purposes I am using an standard battery car (12v 50Ah).
The circuit is working fine but I am experiencing some issues:
a) When the motor is not working at maximum I hear a high frequency
noise.
b) With the 50Ah battery I saw a 30A peak current, and the transistor
burned out. I am thinking about using a more powerfull transistor. Do
I need to change it or not? Cause I will use a 20Ah battery in the
final design.
c) I will use this PWM in a three-wheeled electric vehicle. What do
you think about the general project itself? It is enough with that
battery and motor? Any other advice?
Thanks in advance for your help.
Vicente.
.
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