Converting AC Signals to DC for PIC

In summary, the conversation discusses a project involving an autoguided vehicle and the use of inductive sensors to follow a track with a current of 140mA at 10kHz. The project consists of three parts: the sensor, motor, and control unit. The sensor requires an amplifier with a 10kHz filter and a precision rectifier to convert the AC signal to DC for the PIC to process. The use of multiple circuits or switching inputs can help with sample rate requirements.
  • #1
onceinalifetim
38
0
Hello

I know what is AC signal and DC signals purpose.. but may I know how to convent AC signals to DC signals to feed into the PIC??

Help pls
 
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  • #2
hi there

tell us more about what you are trying to do...
for example ( but not limited to) the source of the AC signal

cheers
Dave
 
  • #3
hello

thanks for the reply..

I am currently working on a autoguilded vechile project,
i am doing the inductive sensor at the min...
three parts to handle. sensor, motor and control system..

help pls
 
  • #4
The overall project is like this

A vehicle will follow a track which consists of a continuous loop of wire carrying a current of ~140mA (RMS) at a frequency of 10kHz
The vehicle consists 3 parts, 2 Inductive sensors, motor driving and steering and control unit pic.

The inductive sensor consists 2 parts, the sensor and rectifier
 
  • #5
with a PIC that has an ADC you can just amplify the coil outputs and then sample AC (dc offset of course) with the ADC.

The amplifier should at least include a simple 10KHz filter unless you want to try an IIR in the PIC. (and an antialias filter)

If the PIC is not fast enough for the above, you can follow the amp with a precision rectifier and then send DC to the PIC.

So, amplifier with 10KHz filter, precision rectifier, ADC to the PIC.

You can build 2 amp/filter/rectifier circuits or you can switch the input to 1 if your sample rate requirements are low enough. For example, 100 times a second would give you 10ms for the circuit to settle. (1000 cycles of 10Khz).
 

1. What is the purpose of converting AC signals to DC for PIC?

The purpose of converting AC signals to DC for PIC is to ensure that the signals received by the PIC (Programmable Integrated Circuit) are in a form that it can process and use effectively. AC signals, or alternating current, fluctuate in both direction and magnitude, making them unsuitable for direct use by the PIC. By converting them to DC, or direct current, the signals become steady and consistent, making them easier for the PIC to process.

2. How does the process of converting AC signals to DC for PIC work?

The process of converting AC signals to DC for PIC involves the use of a rectifier, which is a circuit that allows current to flow in only one direction. This rectifier is typically made up of diodes, which act as one-way valves for the current. The AC signals are fed into the rectifier, which then removes the negative portions of the signal, leaving behind a steady DC signal that can be used by the PIC.

3. What are the benefits of converting AC signals to DC for PIC?

Converting AC signals to DC for PIC offers several benefits. First, it allows for a more stable and consistent signal for the PIC to process, reducing the risk of errors or malfunctions. Additionally, DC signals are easier to manipulate and use for various functions within the PIC. Converting to DC also allows for the use of a wider range of power sources, as many electronic devices and power supplies output DC rather than AC.

4. Are there any challenges or limitations in converting AC signals to DC for PIC?

While converting AC signals to DC for PIC is generally a straightforward process, there are some challenges and limitations to consider. One challenge is the potential loss of information in the conversion process, as the negative portions of the AC signal are removed. This can impact the accuracy or precision of the signal. Additionally, the size and complexity of the rectifier circuit may be a limitation, especially in smaller or more compact devices.

5. Are there any alternative methods for converting AC signals to DC for PIC?

Yes, there are alternative methods for converting AC signals to DC for PIC. One method is the use of a voltage regulator, which can take in a varying input voltage and output a steady DC voltage. Another method is the use of a transformer, which can step down the voltage of the AC signal before it is rectified. However, these methods may be more complex and may not be suitable for all applications.

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