Operational Amplifiers – Application Requirements for Industrial Control Precision

The development of industrial Electronic controls requires the ability to measure and precisely control the position, angle and rotation of equipment. These applications, such as assembly robotics, surface and valve actuators, have the potential not only to provide higher quality finished products, but also to evacuate workers from harsh environments and improve safety.

Mechanical industrial equipment must operate under widely varying conditions, presenting challenges as applications move from the purely mechanical past to today’s hybrid mechanical and electrical systems. For industrial integrated circuits to achieve these capabilities, accuracy over a wide range of environmental conditions is an absolute requirement. These new systems must operate in the same environment and have the same or higher reliability than the mechanical systems they replace.

When we think of mechanical systems, the first thing that comes to mind is motion. Something needs to turn, it needs to move up, down, left or right. A key element of real-world motion using digital control is the resolver, which controls the motion of the system. The key semiconductor device that drives the resolver is the operational amplifier. An example of such a requirement is shown below, and resolver circuits can be used in applications such as industrial robotic arms. (Figure 1) In this example, a signal is passed to an op amp, which drives the resolver to rotate the arm of an industrial robot.

Operational Amplifiers – Application Requirements for Industrial Control Precision

figure 1

Accurate motion, rotational or linear motion measurement requires not only precision but also time and temperature consistency. Regardless of plant location around the world, it is important that inputs initiated by a process controller produce the same motion in all extreme environments. Just as importantly, there is consistent movement from day one of delivery and provides consistent movement throughout the 10+ year industrial life cycle.

ON Semiconductor offers two precision op amps, the NCS21911 and NCV21911, that are excellent choices for meeting precise performance requirements over a wide temperature range (-40°C to 125°C) and maintaining this performance over the years of operation required by industrial markets. kind of performance. Specifications of precision input bias voltage and precision input bias voltage drift with temperature support industrial robotics applications in many fields, such as automotive manufacturing. The innovative technology employed is zero drift, and the performance of most op amps varies with temperature and product aging. The innovation of zero-drift is that the op amp internally self-corrects for performance drift. The same zero-drift technique used to achieve very low offset drift with temperature also corrects for input offset voltage drift over time. See Table 1.

Table 1: NCV21911

Industrial system designers are tasked with designing systems that must operate under extreme environmental conditions, ranging from oil and gas exploration in the Arctic to safe passage through the tropical Panama Canal. The NCS(V)21911’s zero-drift technology is designed to make the designer’s job easier by self-correcting for environmental changes that previously had to be corrected by the system designer. The same technology is also applicable to other applications, including aviation, automotive and weight scales, bringing many benefits to each application.

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