DYNAMIC CONSTANT POWER AMPLIFIER
First Claim
1. An amplifier device, comprising:
- a switching amplifier including an input for receiving an audio input signal and an output to a load, and the switching amplifier including a high voltage supply rail;
a voltage sensor circuit connected to the high voltage supply rail and the voltage sensor circuit measures the power supply voltage of the switching amplifier;
a current sensor circuit connected to the high voltage supply rail and the current sensor circuit measures the power supply current of the switching amplifier;
an error amplifier connected to the switching amplifier receives a value based on the measurements taken by the voltage sensor and current sensor and produces an error signal when a predetermined power limit is exceeded; and
a signal limiting circuit connected to the error amplifier and the switching amplifier, and the signal limiting circuit limits an output power to rated power at any rated load impedance when the error amplifier produces the error signal;
wherein the amplifier device is capable of automatically limiting output power at rated power into all rated load impedances, and dynamically reacting to the frequency-dependant impedance of a typical audio system.
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Accused Products
Abstract
A switching amplifier including a voltage sensor circuit connected to a high voltage supply rail for measuring the power supply voltage. A current sensor circuit is connected to the high voltage supply rail for measuring the power supply current. An error amplifier is connected to the switching amplifier and receives one or more values based on the measurements taken by the voltage sensor and current sensor, and the error amplifier produces an error signal when a predetermined power limit is exceeded. A signal limiting circuit is connected to the error amplifier and the switching amplifier and limits the output power to rated power at any rated load impedance when the error amplifier produces the error signal. This switching amplifier is capable of automatically limiting output power at rated power into all rated load impedances, and dynamically reacts to the frequency-dependant impedance of a typical audio system.
21 Citations
41 Claims
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1. An amplifier device, comprising:
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a switching amplifier including an input for receiving an audio input signal and an output to a load, and the switching amplifier including a high voltage supply rail; a voltage sensor circuit connected to the high voltage supply rail and the voltage sensor circuit measures the power supply voltage of the switching amplifier; a current sensor circuit connected to the high voltage supply rail and the current sensor circuit measures the power supply current of the switching amplifier; an error amplifier connected to the switching amplifier receives a value based on the measurements taken by the voltage sensor and current sensor and produces an error signal when a predetermined power limit is exceeded; and a signal limiting circuit connected to the error amplifier and the switching amplifier, and the signal limiting circuit limits an output power to rated power at any rated load impedance when the error amplifier produces the error signal; wherein the amplifier device is capable of automatically limiting output power at rated power into all rated load impedances, and dynamically reacting to the frequency-dependant impedance of a typical audio system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for delivering rated power into all rated load impedances of a switching amplifier, comprising:
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measuring a power supply voltage of the switching amplifier with a voltage sensor circuit connected to a high voltage supply rail of the switching amplifier; measuring a power supply current of the switching amplifier with a current sensor circuit connected to the high voltage supply rail of the switching amplifier; calculating a value of a power supply power with a power calculator connected between an error amplifier and the voltage and current sensor circuits by multiplying the power supply voltage and power supply current together; comparing the value of the power supply power to a scaled reference representing a rated power with the error amplifier connected to the switching amplifier and the power calculator; producing an error signal from the error amplifier when the value of the power supply power exceeds the scaled reference representing the rated power; and limiting an output power of the switching amplifier to a rated power at any rated load impedance with a signal limiting circuit connected to the switching amplifier and the error amplifier when the error amplifier produces the error signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for delivering rated power into all rated load impedances of a switching amplifier, comprising:
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measuring a power supply voltage of the switching amplifier with a voltage sensor circuit connected to a high voltage supply rail of the switching amplifier; producing a scaled reciprocal value of the power supply voltage with a reciprocal calculator connected to the voltage sensor circuit; measuring a power supply current of the switching amplifier with a current sensor circuit connected to the high voltage supply rail of the switching amplifier and producing a scaled value of the power supply current with the current sensor circuit; comparing the scaled reciprocal value of the power supply voltage from the reciprocal calculator to the scaled value of the power supply current from the current sensor circuit with an error amplifier, the error amplifier being connected to the reciprocal calculator and current sensor; producing an error signal from the error amplifier when scaled value of the power supply current exceeds the scaled reciprocal value of the power supply voltage; and limiting an output power of the switching amplifier to a rated power at any rated load impedance with a signal limiting circuit connected to the switching amplifier and the error amplifier when the error amplifier produces the error signal. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. An amplifier device, comprising:
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a switching amplifier including an input for receiving an audio input signal and an output to a load, and the switching amplifier including a regulated high-voltage supply rail; a current sensor circuit connected to the regulated high-voltage supply rail and the current sensor circuit measures the power supply current of the switching amplifier; an error amplifier connected to the switching amplifier receives a value based on the measurement taken by the current sensor and produces an error signal when a predetermined power limit is exceeded; and a signal limiting circuit connected to the error amplifier and the switching amplifier, and the signal limiting circuit limits the output power to rated power at any rated load impedance when the error amplifier produces the error signal; wherein the amplifier device is capable of automatically limiting output power at rated power into all rated load impedances, and dynamically reacting to the frequency-dependant impedance of a typical audio system. - View Dependent Claims (39, 40, 41)
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Specification