Device and process for charging of rechargeable batteries of implants
First Claim
1. Charging device for charging of rechargeable NiCd, Ni-metal hydride and lithium batteries of implants by transcutaneous transmission of electric power from an external power transmission part to a power receiving part which forms a part of the implant, the charging device comprising a charging current detector having control means for producing a first charging phase in which a relatively high charging current flow is produced which is limited to a stipulated maximum value and for producing a second charging phase in which the charging current is reduced as compared to the charging current which flows in the first charging phase after the cell voltage of a battery being charged has reached a predetermined limiting charging voltage, the reduced charging current in the second charging phase having a value causing the cell voltage to be kept at least approximately to a predetermined constant voltage value during the second charging phase.
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Accused Products
Abstract
A device and a process for charging of rechargeable NiCd, Ni-metal hydride or lithium batteries (12) of implants by transcutaneous transmission of electric power from an external power transmission part (11) to a power receiving part (10) which forms a part of the implant. The charging device is provided with a charging current detector (27, 32, 34) which, in a first charging phase (T1), allows a relatively high charging current (IL) to flow and which, after the cell voltage (UZ) of the battery has reached a predetermined limiting charging voltage (UG), in a second charging phase (T2), reduces the charging current as compared to the charging current which flows at the end of the first charging phase. The charging current detector is made such that, during the second charging phase, it sets the charging current to a value causing the cell voltage during the second charging phase to be kept at least approximately at a predetermined constant voltage value (UG).
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Citations
30 Claims
- 1. Charging device for charging of rechargeable NiCd, Ni-metal hydride and lithium batteries of implants by transcutaneous transmission of electric power from an external power transmission part to a power receiving part which forms a part of the implant, the charging device comprising a charging current detector having control means for producing a first charging phase in which a relatively high charging current flow is produced which is limited to a stipulated maximum value and for producing a second charging phase in which the charging current is reduced as compared to the charging current which flows in the first charging phase after the cell voltage of a battery being charged has reached a predetermined limiting charging voltage, the reduced charging current in the second charging phase having a value causing the cell voltage to be kept at least approximately to a predetermined constant voltage value during the second charging phase.
- 15. Process for charging of rechargeable NiCd, Ni-metal hydride and lithium batteries of implants by transcutaneous transmission of electric power, comprising the steps of performing a first charging phase in which charging current is limited to a relatively high value, and commencing a second charging phase when the cell voltage of the battery being charged reaches a predetermined limiting charging voltage, the charging current in the second charging phase being reduced as compared to the charging current flowing at the end of the first charging phase, and wherein the charging current in the course of the second charging phase is set to a value which keeps the cell voltage at least roughly to a predetermined constant voltage value.
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26. Process as claimed in 15, wherein the charging current is smoothly reduced during the second charging phase.
Specification