Supplying electrical power
First Claim
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1. An active noise reduction (ANR) headset system comprising:
- a headset circuitry receiving an input voltage, the headset circuitry comprising;
an ANR circuit receiving a signal from a microphone positioned in an earcup and including a feedback loop to actively reduce the signal;
a first voltage regulator limiting a voltage supplied to at least one of the ANR circuit and an amplifier to a first predetermined voltage; and
a second voltage regulator limiting the input voltage of the headset circuitry to a second predetermined voltage;
a power supply providing the input voltage to the headset circuitry, the power supply comprising;
a direct current (DC) voltage source supplying power;
a voltage converter circuit converting the power to the input voltage supplied to the headset circuitry, the voltage converter circuit varying the input voltage in response to changes to a headset load current drawn by the headset circuitry from the power supply; and
a voltage control loop circuitry monitoring the headset load current and the input voltage, the voltage control loop circuitry providing a feedback signal to the voltage converter circuit; and
a shutoff circuit placing the headset circuitry in a lower power consumption state when the headset load current falls below a threshold value for a predetermined amount of time.
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Abstract
A power supply includes a battery source supplying power and a voltage converter circuit. The voltage converter circuit converts the power to the input voltage supplied to other circuitry. The voltage converter circuit varies the input voltage in response to a load current drawn by the other circuitry from the power supply.
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Citations
7 Claims
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1. An active noise reduction (ANR) headset system comprising:
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a headset circuitry receiving an input voltage, the headset circuitry comprising; an ANR circuit receiving a signal from a microphone positioned in an earcup and including a feedback loop to actively reduce the signal; a first voltage regulator limiting a voltage supplied to at least one of the ANR circuit and an amplifier to a first predetermined voltage; and a second voltage regulator limiting the input voltage of the headset circuitry to a second predetermined voltage; a power supply providing the input voltage to the headset circuitry, the power supply comprising; a direct current (DC) voltage source supplying power; a voltage converter circuit converting the power to the input voltage supplied to the headset circuitry, the voltage converter circuit varying the input voltage in response to changes to a headset load current drawn by the headset circuitry from the power supply; and a voltage control loop circuitry monitoring the headset load current and the input voltage, the voltage control loop circuitry providing a feedback signal to the voltage converter circuit; and a shutoff circuit placing the headset circuitry in a lower power consumption state when the headset load current falls below a threshold value for a predetermined amount of time. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification