Portable device, charging system, and power source circuit substrate

A hearing aid comprising a power source circuit substrate, the power source circuit substrate including:

• a charging unit configured to charge a secondary battery by an input of outside power from outside of a portable device;
• a transformation unit configured to convert a battery voltage of charged power of the secondary battery to a driving voltage of a driving component, and to output the converted voltage;
• and
• a switching controller configured to switch a state of the transformation unit from an operation state to a stopped state when the charging unit charges the secondary battery causing the corresponding driving component to stop operation during charging of the secondary battery.

A power source circuit substrate comprising:

• a charging unit configured to charge a secondary battery by an input of outside power from outside of a portable device;
• a processing unit driven by charged power of the secondary battery, the processing unit including a hearing aid function component, the processing unit being configured to convert a battery voltage of charged power of the secondary battery to a driving voltage of a driving component, and to output the converted voltage, the processing unit outputting the charged power of the secondary battery to the hearing aid function component;
• and
• a switching controller configured to switch a state of the processing unit from an operation state to a stopped state responsive to the secondary battery being charged by the charging unit causing the processing unit to stop operation during charging of the secondary battery.

A portable device comprising:

• a secondary battery;
• a driving component driven by charged power of the secondary battery, the driving component including a hearing aid function component;
• a charging unit configured to charge the secondary battery by an input of outside power from outside of the portable device;
• a transformation unit configured to convert a battery voltage of the charged power of the secondary battery to a driving voltage of the driving component, and to output the converted voltage, the transformation unit outputting the charged power of the secondary battery to the hearing aid function component;
• and
• a switching controller configured to switch a state of the transformation unit from an operation state to a stopped state responsive to the secondary battery being charged by the charging unit causing the driving component to stop operation during charging of the secondary battery.