Apparatus and method reducing humidity in respiratory protective device

1 . A respiratory protective device comprising:

a humidity sensor component embedded in an exhalation filtration component of the respiratory protective device;

at least one fan component positioned adjacent to an inhalation filtration component of the respiratory protective device; and

a controller component in electronic communication with the humidity sensor component and the at least one fan component, wherein the controller component is configured to:

receive a humidity indication from the humidity sensor component, wherein the humidity indication comprises a humidity value;

calculate a humidity difference value between the humidity value and a threshold humidity value;

determine a reverse rotation speed value for the at least one fan component based on the humidity difference value; and

determine a reverse rotation start signal transmission time point and a reverse rotation stop signal transmission time point for the at least one fan component based at least in part on the reverse rotation speed value.

2 . The respiratory protective device of claim 1 , wherein, when determining the reverse rotation speed value based on the humidity difference value, the controller component is configured to:

compare the humidity difference value with a previous humidity difference value, wherein the previous humidity difference value is associated with a previous reverse rotation speed value of the at least one fan component.

3 . The respiratory protective device of claim 2 , wherein the controller component is configured to:

determine that the humidity difference value increases from the previous humidity difference value;

calculate a humidity difference increase value based on subtracting the previous humidity difference value from the humidity difference value;

determine a reverse rotation speed increase value based at least in part on the humidity difference increase value; and

set the reverse rotation speed value based at least in part on adding the reverse rotation speed increase value to the previous reverse rotation speed value.

4 . The respiratory protective device of claim 2 , wherein the controller component is configured to:

determine that the humidity difference value decreases from the previous humidity difference value;

calculate a humidity difference decrease value based on subtracting the humidity difference value from the previous humidity difference value;

determine a reverse rotation speed decrease value based at least in part on the humidity difference decrease value; and

set the reverse rotation speed value based at least in part on subtracting the reverse rotation speed decrease value from the previous reverse rotation speed value.

5 . The respiratory protective device of claim 1 , further comprising:

a pressure sensor component disposed on an inner surface of the respiratory protective device.

6 . The respiratory protective device of claim 5 , wherein the controller component is configured to:

receive a plurality of air pressure indications from the pressure sensor component, wherein the plurality of air pressure indications comprises a plurality of air pressure values.

7 . The respiratory protective device of claim 6 , wherein, when determining the reverse rotation start signal transmission time point, the controller component is configured to:

calculate a reverse rotation speed up adjustment time period based at least in part on the reverse rotation speed value;

determine an exhalation starting time point based at least in part on the plurality of air pressure indications; and

set the reverse rotation start signal transmission time point based on the exhalation starting time point and the reverse rotation speed up adjustment time period.

8 . The respiratory protective device of claim 7 , wherein the controller component is configured to:

transmit a reverse rotation start signal to the at least one fan component at the reverse rotation start signal transmission time point.

9 . The respiratory protective device of claim 6 , wherein, when determining the reverse rotation stop signal transmission time point, the controller component is configured to:

calculate a reverse rotation slow down adjustment time period based at least in part on the reverse rotation speed value;

determine an inhalation starting time point based at least in part on the plurality of air pressure indications; and

set the reverse rotation stop signal transmission time point based on the inhalation starting time point and the reverse rotation slow down adjustment time period.

10 . The respiratory protective device of claim 9 , wherein the controller component is configured to:

transmit a reverse rotation stop signal to the at least one fan component at the reverse rotation stop signal transmission time point.