ENERGY TRANSFER CONTROL ADAPTED TO A MEDICAL DEVICE SYSTEM

摘要

The disclosed invention varies the width of the energy pulses with constant frequency and constant amplitude to regulate the amount of energy transferred from an energy transmitting device placed outside a patient to an energy receiver inside the patient. The pulse width is achieved with a modulation technique, PWMT, to control the amount of energy transferred from the external energy transmitting coil in the system to the implanted receiver. The PWMT is used to digitally vary the amount of power from the power amplifier that drives the transmitting coil. Compared to previous analog systems a PWM system is a great deal more efficient and can easily be controlled from a digital domain system such as a microprocessor.

主权项

1. An apparatus adapted to transmit wireless energy from an external energy transmitting device placed externally to a human body to an internal energy receiver placed internally in the human body, the apparatus comprising,
a first electric circuit to supply electrical pulses to the external transmitting device, said electrical pulses having leading and trailing edges, said transmitting device adapted to supply wireless energy, wherein the electrical circuit being adapted to vary the lengths of first time intervals between successive leading and trailing edges of the electrical pulses and/or the lengths of second time intervals between successive trailing and leading edges of the electrical pulses, and wherein the transmitted wireless energy, generated from the electrical pulses having a varied power, the power depending on the lengths of the first and/or second time intervals, wherein the first electric circuit has a time constant, and
the first electric circuit is adapted to provide the electrical pulses varying the first and second time intervals to have lengths in the range of, in particular lengths that are in the magnitude of order of or are shorter than, the first time constant, and the relationship or proportion between the lengths of the first and second time intervals is varied, whereby, by the varying a varying power is transmitted.