dinhquochuy
- Jul 3, 2013
- 5
- Joined
- Jul 3, 2013
- Messages
- 5
Hi guys, it's me with my noob-ish questions agains,
I am building a microcontroller controlled regulator circuit, the idea is to use the feed back from the voltage (Through the microcontroller's ADC) to increase or dedrease the output voltage by adjusting the PWM duty cycle. A MOSFET is used as an electrical gate for the battery (such as one in a H-bridge circuit). My battery is 12.6 V and I want a 10V on the output.
I have tested the circuit and so far it has been working well, the MOSFET opens and closes with a small delay time. The only problem remains averaging the output so that it is smooth and is proportional to the duty cycle.
I've read that a low-pass filter with a cut-off frequency much lower than PWM's frequency can do this, but my load on the output is a motor which may draw up to 9A when starting, so I do not think a regular resistor may withstand that. What should I do?
Thank you in advance
I am building a microcontroller controlled regulator circuit, the idea is to use the feed back from the voltage (Through the microcontroller's ADC) to increase or dedrease the output voltage by adjusting the PWM duty cycle. A MOSFET is used as an electrical gate for the battery (such as one in a H-bridge circuit). My battery is 12.6 V and I want a 10V on the output.
I have tested the circuit and so far it has been working well, the MOSFET opens and closes with a small delay time. The only problem remains averaging the output so that it is smooth and is proportional to the duty cycle.
I've read that a low-pass filter with a cut-off frequency much lower than PWM's frequency can do this, but my load on the output is a motor which may draw up to 9A when starting, so I do not think a regular resistor may withstand that. What should I do?
Thank you in advance