Large voice coil driver

[DeanBanks]

Can anyone give me a quick overview of "Hysteresis Mode Switching", commonly used for driving large voice coils with an H-bridge?

I understand that switching frequency changes with error--is this the only difference between this and more conventional PWM control using an H-bridge?

How does a hysteresis mode switch device handle regeneration of energy stored in an inductive load? Does it 'slow' decay through FETs and/or FET body diodes, or does it shunt inductive energy back to the DC bus?

 

[jbartos]

Suggestions: Visit

http://www.intersil.com/data/FN/FN3/FN3658/FN3658.pdf

http://www.intersil.com/data/FN/FN3/FN3659/FN3659.pdf

and References:
1. Standard Handbook for Electrical Engineers, 13th Edition, McGraw-Hill Co., 1993 by D.G. Fink and H.W. Beaty on page 22-112 "optimum-response switching."
2. Geyer M. A. and Kernick A. "Time Optimal Response Control of a Two-Pole Single-Phase Inverter," Power Cond. Spec. Conference Record, 1939? (typo?), pp. 101-109, IEEE Pub. 71C15-AES

http://www.ieee.org