Portable device, charging system, and power source circuit substrate
A portable device including a secondary battery, a plurality of driving components driven by charged power of the secondary battery, a charging unit configured to charge the secondary battery by an input of outside power supplied from outside of the portable device, a plurality of transformation units each configured to output the charged power of the secondary battery at a driving voltage of a corresponding one of the plurality of driving components, a detection unit configured to detect the input of the outside power to the charging unit, and a switching controller configured to switch a state of one of the plurality of transformation units from an operation state to a stopped state responsive to detecting the input of the outside power to the charging unit causing only the corresponding one of the plurality of driving components to stop operation during charging of the secondary battery.
1. A charging system for a hearing aid comprising:
a secondary battery disposed in said hearing aid;
a power supplying resonance coil that generates a power supplying resonance coil magnetic field in a magnetic field space;
a power receiving module disposed in said hearing aid having a power receiving resonance coil that generates a power receiving resonance coil magnetic field in said magnetic field space, said power supplying resonance coil placed at a distance from said power receiving resonance coil so that said power supplying resonance coil magnetic field interacts with said power receiving resonance coil magnetic field in said magnetic field space such that said magnetic field space has a magnetic field strength, at and around an inner side of said power receiving resonance coil, that is lower than a magnetic field strength surrounding said magnetic field space;
a control substrate disposed in said magnetic field space in said hearing aid to reduce the size of said hearing aid, said control substrate comprising:
a charging unit configured to charge said secondary battery from power supplied by said power receiving resonance coil;
a plurality of transformation units that connect power from said secondary battery to a driving voltage for driving components of said hearing aid;
a detection unit configured to detect power received by said power receiving resonance coil; and
a switching controller that switches at least one of said plurality of transformation units off upon detection of power received from said power receiving resonance coil.
2. The charging system according to claim 1 , wherein said hearing aid includes, as one of said driving components, a communication function component configured to send state data indicating a charge state of said hearing aid.
3. A charging system for wirelessly charging a hearing aid comprising:
a charger having a power supplying resonance coil that is connected to an alternating current power source so that said power supplying resonance coil generates a power supplying resonance coil magnetic field;
a power receiving module in said hearing aid, having a power receiving resonance coil that generates a power receiving resonance coil magnetic field in said hearing aid, said power receiving resonance coil placed at a distance from said power supplying resonance coil so that said power supplying resonance coil magnetic field interacts with said power receiving resonance coil magnetic field in a magnetic field space inside said power receiving resonance coil in said hearing aid that has a magnetic field strength, at and around an inner side of said power receiving resonance coil, that is lower than a magnetic field strength surrounding said magnetic field space as a result of interaction of said power supplying resonance coil magnetic field and said power receiving resonance coil magnetic field;
a plurality of transformation units disposed in said magnetic field space, wherein one of said plurality of transformation units is a secondary battery transformation unit that converts power from said power receiving module to a voltage for charging a secondary battery;
a detection unit that detects when said secondary battery is being charged; and
a switching controller that maintains an operational state of said secondary battery transformation unit when said detection unit detects voltage on said charger and turns off other transformation units of said plurality of transformation units.
4. The charging system according to claim 3 , wherein said plurality of transformation units, said detection unit, and said switching controller are disposed on an integrated circuit located in said magnetic field space.
5. A charging system for a hearing aid comprising:
a charger having a power supplying resonance coil that is connected to an alternating current power source so that said power supplying resonance coil generates a power supplying resonance coil magnetic field;
a power receiving module disposed in said hearing aid having a power receiving resonance coil that generates a power receiving resonance coil magnetic field, said power receiving resonance coil being placed at a distance from said power supplying resonance coil so that said power supplying resonance coil magnetic field interacts with said power receiving resonance coil magnetic field which generates a magnetic field space at and around an inner side of said power receiving resonance coil that has a magnetic field strength that is lower than a magnetic field strength surrounding said magnetic field space;
at least two processing units disposed in said magnetic field space; and
a switching controller configured to turn off one of said at least two processing units in response to detection of a secondary battery being charged, causing only said one of said plurality of processing units to stop operation during charging of said secondary battery.