8/26/2023 0 Comments High voltage digital isolator![]() ![]() To guarantee reinforced insulation for drives with system voltage greater than 600 VAC, an isolator must withstand a 5-second temporary overvoltage of at least 4400 VRMS. According to this standard, the requirements on reinforced isolation scale up with an increase in the system voltage which is defined as the root-mean-square (rms) voltage between incoming supply lines and earth. For example, the IEC 6 electrical, thermal and energy safety standard for adjustable speed drives. The requirements for isolation in motor control are defined in safety standards. Motor-drive applications have the most stringent specifications for reinforced isolation because these systems use very high incoming supply voltages and they involve interfaces accessible to human operators. However, reinforced isolators must satisfy increasingly tighter performance requirements. By themselves, reinforced isolators are considered sufficient to ensure electrical safety against high voltage. Reinforced isolators are devices that can provide insulation equivalent to two basic isolators in series. Examples of applications that need isolation include industrial automation systems, motor drives, medical equipment, solar inverters, power supplies, and electric vehicles (EVs). Some examples include protecting human operators and preventing damage to expensive processors in high-voltage systems, breaking the ground loop in communication networks, and communicating to high-side devices in motor-drive or power-converter systems (Figure 1). ![]() ![]() Isolation is required in modern electrical systems for a variety of reasons. Electronic devices and integrated circuits (ICs) used for isolation are called isolators. Isolation is a means of preventing DC and uncontrolled AC currents between two parts of a system, while allowing signal and power transfer between those two parts. This article discusses key end applications that are driving cutting-edge innovations in isolation technology and benefitting from these innovations. Recent advances in isolation technology are enabling new solutions, reducing system cost, and allowing customers to push the performance envelope of their equipment. Anant Kamath, Systems Engineer, Texas Instruments, Inc. ![]()
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