Application Analysis of Analog Isolation Transmitter and Frequency Converter Technology
An analog signal isolation amplifier, also known as an analog isolation transmitter, is a critical component in industrial automation systems that connects field sensors with PLCs, FCS, DCS, and other instrumentation. This device falls under the category of analog signal conditioning and plays a vital role in protecting control loops at all levels. It effectively eliminates or minimizes the impact of environmental noise on the measurement circuit, suppresses interference from common ground, inverters, solenoid valves, and surge pulses, and provides voltage limiting for lower-level equipment to prevent signal distortion. The isolation amplifier acts as a reliable safeguard for transmitters, instruments, inverters, solenoid valves, and communication interfaces in PLC/DCS systems. In environments where high temperatures, vibrations, humidity, and interference signals coexist, using isolation amplifiers ensures that analog signals are amplified, converted, and transmitted remotely with complete isolation of the system loops. This makes it one of the most effective strategies for combating interference in modern automated systems.
Bandwidth, also referred to as frequency range, is the amount of data that can be transmitted over a given period of time, typically measured in bits per second (bps) for digital devices. In analog systems, bandwidth is often expressed in cycles per second or hertz (Hz). It represents the range of frequencies that a signal occupies, which directly affects how well the system can process and transmit information. Understanding bandwidth is essential when selecting appropriate isolation amplifiers for different applications.
Frequency response refers to how well a device processes signals across different frequencies. It's a crucial parameter in electronics, especially when dealing with instruments, sensors, and PLCs. Like distortion, frequency response determines the accuracy and performance of the system, making it a key factor in signal integrity and reliability.
To test the bandwidth of an isolation amplifier, a variable-frequency sine wave is applied to the input, and the maximum frequency range that the output can accurately follow is recorded. In practical applications, bandwidth reflects the speed at which the amplifier responds to changes in the input signal. A higher bandwidth means faster response, while a lower bandwidth may result in reduced sensitivity to transient changes but can offer better immunity to certain types of interference.
The working principle of isolation amplifiers and transmitters involves modulating the standard or special signals—such as temperature, displacement, frequency, or rotational speed—using semiconductor devices. These signals are then isolated through optical or magnetic means before being demodulated and restored with the same precision and linearity or transformed into other signals. Importantly, the power supply and ground are also isolated, ensuring safe and stable operation. As a core component of industrial instrumentation, isolation amplifiers must meet specific technical standards, including bandwidth and frequency response, to ensure reliable performance in various environments.
In industrial settings where electromagnetic compatibility (EMC) issues are prevalent due to frequency converters, high-power starting equipment, and wireless transceivers, specialized isolation amplifiers are used to reduce interference. For example, the ISOEMU-POM series features internal filter circuits to suppress input signal interference and absorb harmonic noise, making them ideal for environments with high-frequency electromagnetic disturbances.
To address different types of interference, several measures are taken: shielding enclosures made of metal materials are used for each system, grounded properly to block external radiation. Communication lines use twisted-pair shielded cables to minimize signal degradation. Power supplies are filtered with EMI filters or suppression reactors to reduce power-related interference. Additionally, DC-DC isolation modules are installed on RS232/RS485 interfaces to isolate communication power from other sources, further enhancing system stability.
When selecting isolation amplifiers, the application’s signal characteristics determine the appropriate model. For slow analog signals (e.g., temperature, pressure, flow), low-bandwidth models like the ISOEMU(A)-POM series are suitable. For high-speed signals (e.g., motor speed, PWM control), high-bandwidth options such as the ISOEMU(A)-POH series are preferred. Most general-purpose systems use standard frequency response models like ISOEMA-PO or ISOEMU-PO. In cases of strong magnetic interference, opto-isolated amplifiers like ISOU(A)-POM are recommended.
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Label: Analog Isolation Transmitter and Drive Technology
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