Methods and apparatus for battery current monitoring

An apparatus to prevent injury from a wearable device, the apparatus comprising:

• a haptic device;
• an isolation switch configured to interrupt delivery of power from a battery to the haptic device;
• an integrator configured to integrate a signal based on a current from the battery to the haptic device to generate an integrator output;
• and
• control logic configured to control the isolation switch based on a comparison of the integrator output to a threshold, wherein prior to activating the isolation switch to interrupt the current, the control logic is configured to start a first delay period to allow system state information to be saved.

A method of preventing injury from a wearable device, the method comprising:

• generating a first output by integrating a signal representative of a current from a battery to a haptic device;
• generating a second output by comparing the first output to a threshold;
• starting a first delay period to allow system state information to be saved;
• and
• after the first delay period, controlling an isolation switch to interrupt the current based on the second output.

A non-transitory computer-readable medium comprising instructions that, when executed, are configured to cause a processor coupled with an apparatus to prevent injury from a wearable device by:

• generating a first output by integrating a signal representative of a current from a battery to a haptic device;
• generating a second output by comparing the first output to a threshold;
• starting a first delay period to allow system state information to be saved;
• and
• after the first delay period, controlling an isolation switch to interrupt the current based on the second output.