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TIDA-010232: TIDA-010232

SUHANI PATEL
Prodigy 10 points
Part Number: TIDA-010232


Tool/software:

I am working with the TIDA-010232 circuit and have encountered a couple of issues regarding voltage measurements and microcontroller integration. I am seeking your guidance on the following:

Case 1: Voltage Drop Across Resistor Bank and RinAMC Output

In the circuit, we have connected the VDC+ to a voltage source ranging from 200V to 750V, and VDC- to Gnd. When the positive switch is activated, we observe that the voltage drop between VDC+ and Protective Earth (PE) is consistent with the expected behavior, as shown in the attached sheet.

We then proceed to measure this voltage at a single-ended ADC input, which appears to be gaining and reading the voltage correctly on the microcontroller.

However, when we replace the resistor bank (originally 280kΩ) with different values—253kΩ, 226kΩ, 199kΩ, 145kΩ—while keeping RinAMC at 250Ω, the output from RinAMC remains unchanged across all resistor bank configurations. However, we observe a drop in the voltage between VDC+ and PE, as well as between VDC- and PE.

Questions:

  1. Why does the RinAMC output remain the same, even though the resistor bank has been modified?

Why is there a voltage drop observed across VDC+ and PE (and VDC- and PE) when changing the resistor values?

Case 2: ADC Output with Small Voltage Difference

We are currently measuring the voltage at a single-ended ADC and have observed a small voltage difference of approximately 20mV at 750V. However, this small voltage difference is challenging to detect with our current microcontroller. Could you kindly advise on potential methods or circuit modifications to increase this voltage difference, making it more detectable by the microcontroller?

Questions:

  1. What is the best approach to handle such small voltage differences in a single-ended measurement using a microcontroller?

Are there any techniques or considerations to ensure accurate readings and stable measurements, especially in the presence of noise or other variations?

I have attached the relevant circuit readings and data for your reference. Any insights or suggestions you can provide would be greatly appreciated.

imd.xlsx