Microprocessor controlled class E driver
First Claim
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1. A charger comprising:
- a charging coil, wherein the charging coil is configured to generate a magnetic field having a frequency and to magnetically couple with an implantable device to recharge the implantable device;
a class E driver electrically connected to the charging coil; and
an FSK module coupled to the class E driver and configured to modulate a natural frequency of the class E driver and configured to modulate the frequency of the magnetic field among at least three frequencies.
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Abstract
A charger including a class E power driver, a frequency-shift keying (“FSK”) module, and a processor. The processor can receive data relating to the operation of the class E power driver and can control the class E power driver based on the received data relating to the operation of the class E power driver. The processor can additionally control the FSK module to modulate the natural frequency of the class E power transformer to thereby allow the simultaneous recharging of an implantable device and the transmission of data to the implantable device. The processor can additionally compensate for propagation delays by adjusting switching times.
335 Citations
24 Claims
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1. A charger comprising:
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a charging coil, wherein the charging coil is configured to generate a magnetic field having a frequency and to magnetically couple with an implantable device to recharge the implantable device; a class E driver electrically connected to the charging coil; and an FSK module coupled to the class E driver and configured to modulate a natural frequency of the class E driver and configured to modulate the frequency of the magnetic field among at least three frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of communicating with an implantable device during charging of the implantable device, the method comprising:
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generating a charging signal with a charging coil by driving the charging coil with a class E driver, wherein the class E driver drives the charging coil at an initial, first frequency; and transmitting data by modulating a natural frequency of the class E driver such that the class E driver drives the charging coil at a second frequency that is lower than the first frequency and at a third frequency that is higher than the first frequency. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of controlling a charger comprising:
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setting an initial frequency of a drive signal, wherein the frequency of the drive signal is set by a processor, and wherein the drive signal controls opening and closing of a switch; driving a charging coil according to the drive signal to create a magnetic coupling between a charger and an implantable device, wherein the magnetic coupling charges the implantable device; sensing a voltage at the switch at a first time; based on the voltage at the switch at the first time, retrieving a value identifying a second frequency; and changing the frequency of the drive signal. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification