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US 6,552,607 B1Granted
Time division multiplexed PWM amplifier
AssigneeApogee Technology, Inc.
InventorMichael Stephen Danielson
Life of this patent
Estimating the term…
Abstract
A bridged amplifier output stage capable of sharing a common conductor between independent loads. Multi-Channel pulse width modulated output signals are time division multiplexed to reduce the number of required conductors. The output stages are driven such that the non-common conductor time multiplexed off-channel(s) receives a copy of the shared common signal. The differential signal on the off-channel(s) is thereby cancelled even though the common conductor is carrying a signal for use by the on-channel.
Claims9
A bridged output amplifier comprising:
- a first channel including a first channel first conductor and a first channel second conductor;
- a second channel including a second channel first conductor and a second channel second conductor;
- a first OR-gate having as input said first channel first conductor and said second channel second conductor, said first OR-gate having an output connected to a first amplifier stage;
- a second OR-gate having as input said first channel second conductor and said second channel second conductor, said second OR-gate having an output connected to a second amplifier stage;
- a third OR-gate having as input said first channel second conductor and said second channel first conductor, said third OR-gate having an output connected to a third amplifier stage;
- wherein said first amplifier stage provides an output to a first side of a first load;
- wherein said third amplifier stage provides an output to a first side of a second load;
- and
- wherein said second amplifier stage provides an output to a second side of said first load and a second side of said second load.
6 more elements
A method of providing two independent channels of electrical power into separate electrical loads using three power conductors comprising:
- providing pulse width modulated signals to a first channel, said first channel comprising a first channel first conductor and a first channel second conductor;
- providing a pulse width modulated signal to a second channel, said second channel comprising a second channel first conductor and a second channel second conductor, wherein said pulse width modulated signal to said second channel is offset by ½ frame relative to said pulse width modulated signal to said first channel;
- applying signals on said first channel first conductor and said second channel second conductor to a first OR-Gate;
- applying signals on said first channel second conductor and said second channel second conductor to a second OR-Gate;
- applying signals on said first channel second conductor and second channel first conductor to a third OR-Gate;
- applying output from said first OR-Gate to a first amplifier stage;
- applying output from said second OR-Gate to a second amplifier stage;
- applying output from said third OR-Gate to a third amplifier stage;
- applying output from said third OR-Gate to a third amplifier stage;
- applying output from said first amplifier stage to a first side of a first load;
- applying output from said third amplifier stage to a first side of a second load;
- and
- applying output from said second amplifier stage to a second side of said first load and a second side of said second load.
10 more elements
A bridged output amplifier comprising:
- a first channel including a first channel first conductor and a first channel second conductor;
- a second channel including a second channel- first conductor and a second channel second conductor;
- a first means having as input said first channel first conductor and said second channel second conductor, said first means having an output connected to a first amplifier stage;
- a second means having as input said first channel second conductor and said second channel second conductor, said second means having an output connected to a second amplifier stage;
- a third means having as input said first channel second conductor and said second channel first conductor, said third means having an output connected to a third amplifier stage;
- wherein said first amplifier stage,provides an output to a first side of a first load;
- wherein said third amplifier stage provides an output to a first side of a second load;
- and
- wherein said second amplifier stage provides an output to a second side of said first load and a second side of said second load.
6 more elements
Dependencies are inferred from the claim text.