Solutions for Isolated DC10~20V Voltage Sampling: Chip and Circuit Design Recommendations

Today, I saw a colleague in our group discussing solutions for “isolated DC10~20V voltage sampling” and asking for chip and circuit design recommendations. In fact, voltage sampling is a crucial step in power supply design and industrial control systems, especially when sampling in high-voltage or complex environments, the isolated circuits become much essential.

Based on our group’s discussion, today we’ll talk about how to implement isolated voltage sampling in the DC10~20V range and recommend several suitable chips and circuit design solutions.

Why Is Isolated Voltage Sampling Necessary?

First, we need to understand that in power systems, isolated voltage sampling not only ensures system stability but also effectively protects sensitive circuits from high-voltage interference at the measuring end.

For instance, in industrial control systems, voltage often needs to make the sample from different power modules or power equipment. Without proper isolation design, the measurement data might be inaccurate, and the measurement circuit could even be loss.

Recommended Chips for Isolated Voltage Sampling

Next, we have selected a few widely used chips from well-known companies in the industry that can help you easily achieve isolated voltage sampling in the DC10~20V range.

1. Analog Devices ADuM Series (ADuM3190 / ADuM4190)
   The ADuM series chips are renowned for their high precision, and excellent isolation performance. The ADuM4190, designed specifically for DC voltage sampling, provides stable and accurate voltage readings in complex environments. With isolation voltages of up to 3.75kV, it’s ideal for handling high-voltage interference in industrial applications.
2. Texas Instruments ISO224
   TI’s ISO224 is a high-performance isolated amplifier, particularly suitable for monitoring power modules and industrial automation scenarios. Its strengths lie in its low power consumption design and its ability to maintain accurate sampling, under varying temperatures and working conditions.
3. Linear Technology LTC2945
   The LTC2945 is a high-end current and power monitor that supports a wide voltage range. Not only can it capture voltage, but it also monitors power usage, making it an integrated solution for applications that require precise monitoring of power and energy consumption.

Circuit Design Example

Next, let’s look at a simple circuit design demonstrating how to use these chips for isolated voltage sampling. Below is a design based on the ISO224.

• Input Voltage: We use a DC voltage of 10~20V as the input, and the ISO224 provides isolation.
• Isolation Component: The ISO224 has an integrated high-precision isolation amplifier, and through its output, we obtain the isolated voltage signal.
• Operational Amplifier: If further amplification of the signal is needed, an external operational amplifier like the LM358 can be connected for more precise processing in subsequent circuits.

This design ensures that high-voltage sampling does not affect the downstream processing circuit, providing safety and reliability.

Practical Applications of Isolated Voltage Sampling

In real-world applications, these isolated voltage sampling solutions widely applied in power module voltage monitoring, industrial automation systems, and power equipment status monitoring. Especially in photovoltaic power generation systems or industrial robot control, voltage sampling requires isolation to prevent interference with core control units.

For example, if you’re designing a photovoltaic inverter that requires real-time monitoring of multiple input voltages, using an isolated sampling chip like the ISO224 can not only enhance system stability but also ensure accurate transmission of voltage signals.

How to Choose the Right Isolated Voltage Sampling Solution?

When selecting an isolated voltage sampling solution, the key factors to consider include the isolation level, accuracy, power consumption, and the operating environment of your system. Depending on your specific application scenario, we’ve recommended several excellent chips, such as Analog Devices’ ADuM series and TI’s ISO224.

If you’re designing a power supply system or industrial equipment, you might want to reference these solutions to enhance your product’s reliability and performance.

For further technical support, feel free to contact us.

CHONA POWER SUPPLY has specialized in power modules for 12 years, focusing on the production and development of DC-DC Converters & AC-DC Converters.