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Integrated Low-Voltage Floating Power Supply in High-Voltage Technology for High dV/dt Applications

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4 Author(s)
Stefano Ruzza ; International Rectifier, IC Motion Group, Italy ; Enrico Dallago ; Sergio Morini ; Giuseppe Venchi

This letter presents an integrated low-voltage floating supply in monolithic high-voltage technology aimed at supplying signal processing circuits, used in insulated-gate bipolar transistor or MOSFET-based inverter applications, diffused inside the same floating pocket where the power supply resides. This pocket is biased by the supply output with a voltage lower than the bootstrap capacitor voltage. As a consequence, signal processing circuits can be implemented using high performance, 5 V MOSFETs instead of the 20 V devices that are necessary when the bootstrap capacitor is used as a power supply. Measurements performed on a first test chip demonstrated the feasibility of the idea. The circuit was modified to make it insensitive to the charge injection phenomena caused by high dV/dt typical of these applications, as confirmed by measurements on a second test chip.

Published in:

IEEE Transactions on Power Electronics  (Volume:26 ,  Issue: 5 )