Sanghvi Electronics

Functional Description

Closed‑loop Hall Effect Principle – The LAH 100‑P uses a Hall sensor with a feedback coil to compensate the magnetic field produced by the primary current. The feedback enables very accurate measurement by keeping the magnetic flux near zero inside the magnetic core. The secondary output current is proportional to the primary current with a fixed ratio (e.g., 1 mA per 2 A of primary current), allowing a direct current‑mode output.

 

Galvanic Isolation – The transducer provides electrical isolation between the high‑current primary conductor and the transducer electronics, enabling safe measurement without introducing loading or ground loops.

 

Typical Operating Principles

• Primary Current (IP) flows through the transducer’s primary conductor (or PCB trace), generating a magnetic field.
• The Hall sensor inside detects the magnetic field.
• A feedback circuit drives a secondary current (IS) through the internal coil to cancel the magnetic field.
• The output current (IS) is proportional to the primary current with a fixed ratio (e.g., 1:2000).
• A burden resistor (external) is often used to convert this output current into a voltage for measurement by ADCs or monitoring circuits.

 

Typical Applications

• Three‑phase variable speed drives and motor control systems
• Uninterruptible power supplies (UPS)
• Switched‑mode power supplies (SMPS)
• Battery‑powered systems and converters
• Welding power supplies
• Industrial power electronics requiring accurate current feedback with isolation  

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