DRIVERS AND METHODS FOR DRIVING A LOAD
First Claim
1. A method of driving a load with an amplifier, the method comprising:
- applying a command voltage to the load;
generating a voltage control signal representative of a voltage across the load;
generating a current control signal representative of a current through the load;
combining the voltage control signal and the current control signal to generate a hybrid control signal; and
adjusting the command voltage based on the hybrid control signal.
3 Assignments
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Accused Products
Abstract
Embodiments of the present invention provide methods and devices for controlling a command signal applied to a load. In embodiments of the invention, current through and voltage across a load are determined and the values of both are used to generate a hybrid control signal. For example, in some embodiments the hybrid control signal is generated by taking a weighted summation of the current and voltage control signals. In other embodiments, a percentage of the difference between the current and voltage control signals is added to one of the current or voltage control signals to generate the hybrid control signal. In one embodiment, a potentiometer is used to generate the hybrid control signal.
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Citations
32 Claims
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1. A method of driving a load with an amplifier, the method comprising:
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applying a command voltage to the load; generating a voltage control signal representative of a voltage across the load; generating a current control signal representative of a current through the load; combining the voltage control signal and the current control signal to generate a hybrid control signal; and adjusting the command voltage based on the hybrid control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of improving bass performance of a loudspeaker receiving audio input, the method comprising:
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determining a threshold frequency below which to apply hybrid control; and controlling operation of an amplifier driving the loudspeaker for frequencies at or below the threshold frequency, wherein said controlling comprises; applying a command voltage to the loudspeaker; generating a voltage control signal representative of a voltage across the loudspeaker; generating a current control signal representative of a current through the loudspeaker; combining the voltage control signal and the current control signal to generate a hybrid control signal; and adjusting the command voltage based on the hybrid control signal. - View Dependent Claims (16, 17)
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18. A driver for driving a load, the driver comprising:
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an amplifier configured to apply a command signal to the load; a voltage sensor configured to generate a voltage control signal indicative of a voltage across the load; a current sensor configured to generate a current control signal indicative of a current through the load; a controller having a first input terminal, a second input terminal, and an output terminal, wherein the controller is configured to; receive the voltage control signal at the first input terminal; receive the current control signal at the second input terminal; and generate a hybrid control signal at the output terminal based on both the voltage control signal and the current control signal; and a feedback device configured to receive the hybrid control signal and configured to modify the command signal based on the hybrid control signal. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. An audio system, the system comprising:
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a loudspeaker; and a driver comprising; an amplifier configured to apply a command signal to the loudspeaker; a voltage sensor configured to generate a voltage control signal indicative of a voltage across the loudspeaker; a current sensor configured to generate a current control signal indicative of a current through the loudspeaker; a controller having a first input terminal, a second input terminal, and an output terminal, wherein the controller is configured to; receive the voltage control signal at the first input terminal; receive the current control signal at the second input terminal; and generate a hybrid control signal at the output terminal as a function of both the current control signal and the voltage control signal; and a feedback device configured to receive the hybrid control signal and configured to modify the command signal based on the hybrid control signal.
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Specification