Energy efficient resonant driving circuit for magnetically coupled interaction with an implantable medical device

摘要

A driving circuit useful in a magnetic inductive coupling wireless communication system is disclosed. The circuit includes an inductor (coil) and capacitor in series selectively coupled to a power source such as a rechargeable battery. The LC circuit is made to resonate in accordance with a Frequency Shift Keying or other protocol. Such resonance produces a voltage across the inductor. This voltage is used to create a first voltage either by tapping into the coil, or by providing a transformer. The first voltage is coupled to the rechargeable battery by a diode. When the circuit resonates, and when the first voltage exceeds the voltage of the power source, the diode turns on, thus shunting excess current back to recharge the rechargeable battery. By use of this circuit, energy is conserved. Additionally, oscillations can be quickly dampened so as to allow the circuit to transmit at high data rates.

主权项

1. A driving circuit useful in a magnetic inductive coupling system, comprising:
a rechargeable battery; a resonant circuit including a coil configured to be driven to produce a magnetic field; a diode; and a node comprising a tap into a portion of the coil, wherein the tap connects the coil to the rechargeable battery via the diode to shunt current to the rechargeable battery.