High Voltage Coil Current Sensor for DC-DC Converters Employing DDCC

• Main Authors: M. Drinovsky, J. Hospodka
• Format: Article
• Language: English
• Published: Spolecnost pro radioelektronicke inzenyrstvi 2015-12-01
• Series: Radioengineering
• Subjects: Current sensor; current conveyor; DDCC; DC-DC converter
• Online Access: http://www.radioeng.cz/fulltexts/2015/15_04_0988_0992.pdf

Current sensor is an integral part of every switching converter. It is used for over-current protection, regulation and in case of multiphase converters for balancing. A new high voltage current sensor for coil-based current sensing in DC-DC converters is presented. The sensor employs DDCC with high voltage input stage and gain trimming. The circuit has been simulated and implemented in 0.35 um BCD technology as part of a multiphase DC-DC converter where its function has been verified. The circuit is able to sustain common mode voltage on the input up to 40 V, it occupies 0.387*0.345 mm2 and consumes 3.2 mW typically.