Power regulation of a cochlear implant system

A cochlear implant system comprising:

• an external unit configured to be arranged on a head of a recipient or at an ear of the recipient of the cochlea implant system, the external unit including at least:
• a first inductive transceiver configured to transmit power via a transcutaneous link,
• an implantable unit configured to arranged between the skin and the skull of the recipient, the implantable unit including at least:
• an electrode array including a plurality of electrodes configured to apply a plurality of stimulation pulses during a stimulation frame to auditory nerve fibers of a recipient of the cochlea implant system, and
• a second inductive transceiver configured to receive power via the transcutaneous link,
• a microphone unit configured to receive an acoustic wave and provide an audio signal based on the acoustic wave, wherein the plurality of stimulation pulses is determined based on the audio signal;
• a power management unit configured to:
• determine a stimulation power consumption of the implantable unit for providing the plurality of stimulation pulses of the stimulation frame to the auditory nerve fibers of the recipient,
• determine a power consumption stage of the implantable unit, and
• determine, based on the power consumption stage and a power tuning function, a target output power of the first inductive transceiver for obtaining a target power at the second inductive transceiver which leads to an input power to a stimulator unit of the implantable unit, where the input power is equal to or about equal to the determined stimulation power consumption, and
• wherein the stimulator unit is configured to transmit the plurality of the stimulation pulses to the electrode array based on the input power,
• wherein determining the stimulation power consumption includes:
• determining a standby current consumed by the stimulator unit of the implantable unit during up powering of the implantable unit;
• and
• estimating a stimulation current for each of the stimulation pulse of the plurality of stimulation pulses, and
• wherein the stimulation power consumption includes the standby current and the stimulation current for each of the stimulation pulses of the plurality of stimulation pulses.