Wearable device and operation method thereof
A wearable device may include a motor, a motor driver circuit, a frame connected to the motor, the frame to be worn on the body of the user to support the body, a processor configured to generate a control signal to control an electrical connection in the motor driver circuit, and a sensor configured to sense a body motion of the user. The processor is further configured to provide an exercise load through the frame according to a speed of the sensed body motion by controlling, based on the speed of the body motion, a changing ratio per time between a first control state in which the electrical connection in the motor driver circuit is a closed loop and a second control state in which the electrical connection in the motor driver circuit is an open loop.
1. A wearable device for providing a user with an exercise load while being worn on a body of the user, the wearable device comprising:
a frame configured to be worn on the body of the user to support the body;
a motor configured to attach to the frame;
a motor driver circuit connected to the motor, the motor driver circuit configured to operate in a first control state and a second control state, the first control state being a state in which an electrical connection in the motor driver circuit is a closed loop and the second control state being a state in which the electrical connection in the motor driver circuit is an open loop;
a sensor configured to sense a body motion of the user; and
a processor configured to generate a control signal to control the electrical connection in the motor driver circuit to provide the exercise load through the frame according to a speed of the body motion of the user by adjusting, per time, a ratio between a duration of the first control state and a duration of the second control state to correspond to a second speed, when the speed of the body motion of the user changes from a first speed to the second speed.
2. The wearable device of claim 1 , wherein the processor is further configured to periodically and alternately repeat switching between the first control state and the second control state based on the ratio.
3. The wearable device of claim 1 , wherein the processor is further configured to,
determine the speed of the body motion based on the body motion.
4. The wearable device of claim 1 , wherein the processor is further configured to adjust the ratio by reducing the duration of the first control state and increasing the duration of the second control state, when the second speed is greater than the first speed.
5. The wearable device of claim 1 , wherein the processor is further configured to adjust the ratio by increasing the duration of the first control state and reducing the duration of the second control state, when the second speed is less than the first speed.
6. The wearable device of claim 1 , wherein the processor is further configured to adjust the ratio based on a target exercise load and the speed of the body motion.
7. The wearable device of claim 6 , wherein the processor is configured to receive an input of the target exercise load from the user.
8. The wearable device of claim 1 , wherein the processor is further configured to generate the exercise load by forming the closed loop in the first control state without driving the motor using power of a battery.
9. The wearable device of claim 1 , wherein the processor is further configured to control the motor to generate a torque in a direction that hinders the body motion by supplying the motor with power of a battery, and generating the exercise load by controlling a change between the first control state and the second control state.
10. The wearable device of claim 1 , wherein the motor driver circuit comprises:
a plurality of switches configured to control the electrical connection in the motor driver circuit based on the control signal.
11. The wearable device of claim 1 , wherein the wearable device is configured to be worn on a lower part of the body of the user to provide a resistive force to the lower part of the body of the user.
12. A method of operating a wearable device for providing a user with an exercise load while being worn on a body of the user, the wearable device including a frame configured to be worn on the body of the user, and a motor configured to attach to the frame, the motor being connected to a motor driver circuit configured to operate in a first control state and a second control state, the first control state being a state in which an electrical connection in the motor driver circuit is a closed loop and the second control state being a state in which the electrical connection in the motor driver circuit is an open loop, the method comprising:
sensing, via a sensor, a body motion of the user; and
generating a control signal to control the electrical connection in the motor driver circuit to provide the exercise load through the frame according to a speed of the body motion of the user by adjusting, per time, a ratio between a duration of the first control state and a duration of the second control state to correspond to a second speed, when the speed of the body motion of the user changes from a first speed to the second speed.
13. The method of claim 12 , wherein the generating the control signal generates the control signal to periodically and alternately repeat switching between the first control state and the second control state.
14. The method of claim 12 , wherein the generating the control signal comprises:
determining the speed of the body motion based on the body motion.
15. The method of claim 12 , wherein the generating the control signal comprises generating the control signal to adjust the ratio by reducing the duration of the first control state and increasing the duration of the second control state, in response to the second speed being greater than the first speed.
16. The method of claim 12 , wherein the generating the control signal comprises generating the control signal to adjust the ratio by increasing the duration of the first control state and reducing the duration of the second control state, in response to the second speed being less than the first speed.
17. A non-transitory computer-readable storage medium storing instructions executed by a processor to perform a method of operating a wearable device for providing a user with an exercise load while being worn on a body of the user, the wearable device including a frame configured to be worn on the body of the user, and a motor configured to attach to the frame, the motor being connected to a motor driver circuit configured to operate in a first control state and a second control state, the first control state being a state in which an electrical connection in the motor driver circuit is a closed loop and the second control state being a state in which the electrical connection in the motor driver circuit is an open loop, the method comprising:
sensing, via a sensor, a body motion of the user; and
generating a control signal to control the electrical connection in the motor driver circuit to provide the exercise load through the frame according to a speed of the body motion of the user by adjusting, per time, a ratio between a duration of the first control state and a duration of the second control state to correspond to a second speed, when the speed of the body motion of the user changes from a first speed to the second speed.