Electronic device worn on the body, hearing aid instrument, and voltage supply for such a device
A voltage supply for an electronic device, such as a hearing aid instrument, to be worn on the body of a user. The voltage supply has a charge pump for converting a battery voltage by a conversion factor to an intermediate voltage. The charge pump can be changed over between at least two stages of the conversion factor. The voltage supply furthermore has a voltage regulator for reducing the intermediate voltage to an output voltage of a predefined setpoint value and a controller for reversibly changing over the charge pump between the stages of the conversion factor. The controller is configured to actuate the charge pump in accordance with a manipulated variable of the voltage regulator.
1 . A voltage supply for an electronic device to be worn on the body of a user, the voltage supply comprising:
a charge pump for converting a battery voltage by a conversion factor to an intermediate voltage, said charge pump being configured for changing over between at least two stages of the conversion factor;
a voltage regulator for reducing the intermediate voltage to an output voltage of a predefined setpoint value; and
a controller for reversibly changing over said charge pump between the at least two stages of the conversion factor, said controller being configured to actuate said charge pump in accordance with a manipulated variable of said voltage regulator
said charge pump being configured to be changed over between a first stage with a lower value of the conversion factor and a second stage with a higher value of the conversion factor;
said controller being configured to set the second stage of the conversion factor if the manipulated variable of said voltage regulator exceeds a first, higher reference value, and to set the first stage of the conversion factor if the manipulated variable of the voltage regulator falls below a second, lower reference value.
2 . The voltage supply according to claim 1 , wherein the first stage corresponds to a conversion factor of 3:1.
3 . The voltage supply according to claim 1 , wherein the second stage corresponds to a conversion factor of 2:1.
4 . The voltage supply according to claim 1 , wherein said controller is configured to maintain the second stage of the conversion factor at least for a predefined delay time.
5 . The voltage supply according to claim 1 , wherein said controller is configured to allow a change from the second stage of the conversion factor to the first stage of the conversion factor only if the battery voltage exceeds a predefined minimum value.
6 . The voltage supply according to claim 1 , wherein said voltage regulator is a proportional controller or a proportional-integral controller.
7 . The voltage supply according to claim 1 , wherein said voltage regulator is configured to actuate a continuously controllable semiconductor switch with the manipulated variable in order to set the output voltage to the predefined setpoint value.
8 . The voltage supply according to claim 7 , wherein said continuously controllable semiconductor switch is a MOSFET.
9 . The voltage supply according to claim 1 , configured for a hearing aid instrument to be worn by the user.
10 . A wearable electronic device, comprising a voltage supply according to claim 1 .
11 . The electronic device according to claim 10 being a hearing aid instrument.