Patent number 8558618 is assigned to
The following quote was obtained by the news editors from the background information supplied by the inventors: "This disclosure relates to a versatile audio power amplifier.
"Switching amplifiers, also called Class D amplifiers, amplify an input signal by modulating that signal into a series of pulses that drive a complementary pair of transistors operated in the switching mode. The transistors alternately couple positive and negative power sources to the output, which in total produce an amplified representation of the input signal."
In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventors' summary information for this patent: "In general, in some aspects, an audio power amplifier includes a first and a second amplification unit that each have a switching voltage amplifier having a command signal input and an amplified signal output. Control electronics provide signal inputs to the first and second amplification units and control the first and second amplification units such that the first and second amplification units are operable in each of three modes. The three modes include (i) a first mode, wherein the first amplification unit amplifies a first signal and drives a first load, and the second amplification unit amplifies a second signal and drives a second load, (ii) a second mode, wherein the first amplification unit amplifies a first signal, the second amplification unit amplifies the first signal, and the amplified signal outputs of the first and second amplification units drive a single terminal of a first common load in parallel, and (iii) a third mode, wherein the first amplification unit amplifies a first signal, the second amplification unit amplifies an inverse of the first signal, and the amplified signal outputs of the first and second amplification units drive opposite terminals of a common load in a bridge-tied-load configuration.
"Implementations may include one or more of the following features. The audio power amplifier further includes a third and a fourth amplification unit substantially identical to the first and second amplification units. The control electronics can further provide signal inputs to the third and fourth amplification units and control the third and fourth amplification units such that the third and fourth amplification units are operable (a) with separate respective third and fourth loads, (b) in parallel driving a single terminal of a second common load in parallel, or © to drive the opposite terminals of the common load in the bridge-tied-load configuration. The four amplification units can be operable together by amplifying a first signal in each of the first and second amplification units, provided from the first amplification unit to the second amplification unit via a first controlled signal path, and providing identical amplified first signals on separate output terminals of the first amplification unit and the second amplification unit, and amplifying an inverted copy of the first signal in each of the third and fourth amplification units, provided from the third amplification unit to the fourth amplification unit via a second controlled signal path, and providing identical amplified inverted first signals on separate output terminals of the third amplification unit and the fourth amplification unit. The audio power amplifier can further include a four-quadrant power supply having a synchronous output rectifier. The synchronous output rectifier can include a MOSFET. The first controlled signal path can include a switch controlled by the control electronics. The switching voltage amplifiers can each include a modulator, a gate driver, a pair of transistors, and a pair of diodes coupled between the source and drain terminals of the transistors. The transistors can include MOSFETS, the diodes being intrinsic to the MOSFETS.
"Advantages include comprehensive configurability with high efficiency. The amplifier can serve a wide variety of connection topologies, load impedances, and power levels without hardware modification. Being able to drive loudspeakers at a wide range of impedances from a single amplifier allows the amplifier to support a diverse range of audio system configurations without requiring a diverse set of amplifier products.
"Other features and advantages will be apparent from the description and the claims."
URL and more information on this patent, see: Nussbaum, Michael; Sheen, Timothy; Pearce, Daniel S.. Versatile Audio Power Amplifier. U.S. Patent Number 8558618, filed
Keywords for this news article include: Electronics,
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