Amplifiers – With semiconductor amplifying device – Including class d amplifier
Reexamination Certificate
2008-11-13
2010-10-19
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including class d amplifier
C330S20700P, C330S010000
Reexamination Certificate
active
07816985
ABSTRACT:
Systems and methods implemented in a switching amplifier for providing consistent, matching switching between top and bottom switching devices in a switching amplifier. One embodiment includes a half-bridge circuit output stage, a driver stage and a transformer. The driver stage, which drives the switches of the output stage, is very fast, has a low propagation delay, and has minimal input capacitance. The transformer drives the drive paths from the transformer inputs to the switches. The transformer avoids resonances within the audio band and at the amplifier switching frequencies, has low and spread free leakage inductance, has enough magnetizing inductance to keep transformer currents low in proportion to the total driver stage current drain, has low core losses at the switching frequency, has minimal inductance change and operates well below its saturation point. The amplifier stage provides a substantially constant amplitude drive signal to the output power switching devices.
REFERENCES:
patent: 4178556 (1979-12-01), Attwood
patent: 4554512 (1985-11-01), Aiello
patent: 4992751 (1991-02-01), Attwood et al.
patent: 6198263 (2001-03-01), Chan
patent: 6294954 (2001-09-01), Melanson
patent: 6459336 (2002-10-01), Luu
patent: 7034609 (2006-04-01), Risbo et al.
patent: 7078693 (2006-07-01), Andersen et al.
patent: 7138864 (2006-11-01), Mazda
patent: 7279697 (2007-10-01), Quilter
patent: 7362354 (2008-04-01), Kost
patent: 2002/0125941 (2002-09-01), Nguyen et al.
patent: 2007/0182486 (2007-08-01), Chieng et al.
patent: 2008/0116971 (2008-05-01), McMorrow
patent: 7321567 (1995-12-01), None
patent: 2004-228912 (2004-08-01), None
patent: 2004-328413 (2004-11-01), None
Leggate et al., “Pulse-Based Dead-Time Compensator for PWM Voltage Inverters,” IEEE Transactions Industrial Electronics, vol. 44, Issue 2 (Apr. 1997), pp. 191-197.
Written Opinion and International Search Report for PCT/US2008/083677 (Jul. 9, 2009).
Attwood Brian E
Hand Larry E.
Taylor Wilson E.
Fliesler & Meyer LLP
Intersil America's Inc.
Nguyen Hieu P
Pascal Robert
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