Open-Loop and Closed-Loop Hall-effect Current Sensors
Kohshin Electric Corp. will be featuring three new lines of current sensors during Techno Frontier 2015 at Tokyo's Makuhari Messe. Two new lines of open-loop current sensors will be highlighted; the HC-PDK series rated for currents from 6A to 50A and the HC-PNA series of sensors rated for currents from 50A to 800A. In addition, Kohshin will be showing the HS-PTA series of closed-loop current sensors rated for currents from 50A to 100A.
As the result from the development of a custom ACIS, the HC-PDK series is smaller and high higher precision compared with Kohshin’s previous devices. In addition, the custom ASIC results in a smaller temperature drift as a result of built-in temperature correction circuit. These devices operate with a 5V single power supply and feature superior noise-resistance. Applications are expected to include inverters, servo drivers, general power supply equipment, uninterruptible power supplies, welders, and photovoltaic inverters.
The higher-current HC-PNA current sensors offer a choice of 5V single power supply and dual power supply operation. These devices are potted for improved environmental performance. The ferrite cores are optimized for a wide current range (up to 800A) as a countermeasure against heat generation by high-frequency current. These RoHS-compliant open-loop current sensors are expected to fine application in NC machine tools, servo drivers, and general inverter applications.
The HS-PTA closed-loop current sensors offer improved accuracy and response speeds compared with previous-generation devices. They are offered in both voltage output type and current output configurations. HS-PTA current sensors can monitor up to three circuits at the same time. They are offered in two series, the “light-weight†series that is 30% lighter than previous devices and the “thin†series that are 15% thinner than pervious devices. Applications are expected to include general inverters, servo drivers, various types of power supply equipment, and NC machine tools.
