Hi, Phase_Accurate,
Looking at old patents is interesting
Like this one, #5014016, the modulation scheme is similiar to Crown's BCA (#5657219).
This one, #4849651, the half bridge drive is interesting.
There's also some application about square wave (instead of triangle, http://www.google.com/patents?id=4WqcAAAAEBAJ&dq=square+wave+modulation+design) or asynchronous selfoscilation bridge (http://www.google.com/patents?id=IsR_AAAAEBAJ&dq=asynchronous+BTL+design) or something preceeding UCD (#4507619)
Looking at old patents is interesting
Like this one, #5014016, the modulation scheme is similiar to Crown's BCA (#5657219). This one, #4849651, the half bridge drive is interesting.
There's also some application about square wave (instead of triangle, http://www.google.com/patents?id=4WqcAAAAEBAJ&dq=square+wave+modulation+design) or asynchronous selfoscilation bridge (http://www.google.com/patents?id=IsR_AAAAEBAJ&dq=asynchronous+BTL+design) or something preceeding UCD (#4507619)