Methods and apparatus for battery current monitoring
First Claim
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1. A current controller to prevent injury from a battery operated head wearable device, the current controller comprising:
- a haptic device;
an isolation switch to deliver power from a battery to the haptic device;
a sense resistor in circuit with the battery and the isolation switch, the sense resistor to generate a voltage based on current from the battery to the haptic device;
a current sense amplifier in circuit with the sense resistor, the current sense amplifier to sense the voltage;
an integrator in circuit with an output of the current sense amplifier, the integrator to integrate the output to generate an integrator output;
a comparator in circuit with the integrator, the comparator to compare an overcurrent threshold reference and the integrator output to generate an overcurrent indicator; and
control logic in circuit with the comparator and the isolation switch, the control logic to generate an isolation switch control signal in response to the overcurrent indicator to cause the isolation switch to interrupt delivery of the current from the battery to the haptic device to prevent burn injury to a wearer of the battery operated head wearable device.
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Abstract
Methods and apparatus are disclosed for battery current monitoring. A current controller can prevent injury from a battery operated wearable device. An isolation switch can interrupt delivery of current of a battery to a load in response to an isolation switch control signal to prevent burn injury to a wearer of the battery operated wearable device. The battery operated wearable device can be wrist wearable or head wearable.
10 Citations
20 Claims
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1. A current controller to prevent injury from a battery operated head wearable device, the current controller comprising:
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a haptic device; an isolation switch to deliver power from a battery to the haptic device; a sense resistor in circuit with the battery and the isolation switch, the sense resistor to generate a voltage based on current from the battery to the haptic device; a current sense amplifier in circuit with the sense resistor, the current sense amplifier to sense the voltage; an integrator in circuit with an output of the current sense amplifier, the integrator to integrate the output to generate an integrator output; a comparator in circuit with the integrator, the comparator to compare an overcurrent threshold reference and the integrator output to generate an overcurrent indicator; and control logic in circuit with the comparator and the isolation switch, the control logic to generate an isolation switch control signal in response to the overcurrent indicator to cause the isolation switch to interrupt delivery of the current from the battery to the haptic device to prevent burn injury to a wearer of the battery operated head wearable device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of preventing thermal injury in a head wearable device, the method comprising:
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sensing current from a battery to a haptic device; integrating a signal representative of the current to generate an integrator output; comparing the integrator output and an overcurrent threshold reference; generating an overcurrent indicator in response to the integrator output satisfying the overcurrent threshold reference; and in response to the overcurrent indicator, interrupting the current from the battery to the haptic device to prevent the thermal injury associated with the head wearable device. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A head wearable system to avoid thermal head injury due to overcurrent, the head wearable system comprising:
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a haptic device; an isolation switch to deliver power from a battery to the haptic device; a sense resistor to generate a voltage based on a current from the battery to the haptic device; a current sense amplifier having inputs in circuit with the sense resistor, the current sense amplifier to sense the voltage; an integrator in circuit with an output of the current sense amplifier, the integrator to integrate the output of the current sense amplifier to generate an integrator output, the integrator including a reset switch to reset the integrator; a comparator to compare an overcurrent threshold reference and the integrator output to generate an overcurrent indicator based on the comparison; and control logic to cause the isolation switch to interrupt the current from the battery to the haptic device based on the overcurrent indicator to avoid the thermal head injury. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification