H - Electricity – 03 – G
Patent
H - Electricity
03
G
330/106, 330/17,
H03G 3/32 (2006.01) H03F 1/02 (2006.01) H03F 3/26 (2006.01)
Patent
CA 1162484
Abstract The present invention comprises an amplifier circuit and transformer based power supply wherein greater efficiency is achieved by using the input signal characteristics to control various aspects of the circuit operation. The transformer primary winding is energized by a pulsed power supply which is duty cycle modulated in response to the signal being amplified. One embodiment of the amplifier employs output transistors connected to respective stepped voltage levels. Amplifier con- trol circuitry acts in relation to the input signal amplitude to more evenly distribute the voltage drop across the inter- connected transistors, thus reducing amplifier power requirements and minimizing distortion in the amplifier output. In another embodiment, a stereo amplifier constructed in accordance with the present invention contains a network for inverting the audio signals received by a first amplifier input channel. The inverted signals are thereafter processed in out-of-phase relationship to the signals in the second amplifier input channel to more efficiently utilize the power supply. In yet another embodiment, the power supply itself is constructed with a number of fault detecting circuits which sense fault conditions in either the power supply or the amplifier and shut the power off accordingly.
342984
Carver Robert W.
Gowling Lafleur Henderson Llp
LandOfFree
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