IEEE Circuits and Systems Magazine - Q3 2022 - 33

VCC
vo
R11
RFC11
L1
vi
C11
R12
C15
Cj11 Cj12
The Transmitting
Coil
(a)
Figure 12. Transmitter of the DFAICL. (a) Circuit. (b) Board.
traditional ICL as a function of frequency when the supply
power is 30 dBm and the distance (d) between the
two coils is varied. It can be seen that the frequency splitting
occurs when d 15mm=
and d 10 mm.=
Moreover,
the lower and upper peak powers (located at the lower
and upper splitting frequencies, respectively) in the traditional
ICL deviate from the resonant frequency (2 MHz).
In contrast, the upper peak power of the DFAICL is tuned
and close to the resonance frequency.
B. The Receiver of the DFAICL
The receiver of the DFAICL contains
functional blocks similar to
those of the modified series LC
network presented in the transmitter
of the DFAICL. Exclusively, it includes
a low-noise 5-V low-dropout
(LDO) regulator (i.e., NCV178, ON
Semiconductor, Phoenix, AZ, USA),
a Li-ion battery charge management
chip [i.e., LTC4054, Linear
Technology (now part of Analog
Devices), Milpitas, CA, USA], a 3.3-V
LDO regulator (i.e., NCP583, ON
Semiconductor), and a boost DC-
DC converter (i.e., TPS1085, TI) to
generate a sufficiently high compliance
voltage. Fig. 14 shows the
receiver of the DFAICL with its discrete
components. Fig. 15 displays
the AC voltage at the receiving
coil and the wireless power transmission
efficiency of the DFAICL
THIRD QUARTER 2022
(which is defined as the maximum DC power at the output
of the 5V LDO over the supply power at the transmitter
of the DFAICL) as a function of the supply power when
d is varied. It can be seen that the received AC power
increases steadily according to the supply power, and a
maximum wireless power transmission efficiency of 17%
is achieved when the supply power is 30dBm and d is
20 mm at 2 MHz. In such a condition and using tissue parameters
given in [36], the estimated specific absorption
The Traditional ICL
40
30
20
10
1.4 1.5 1.6 1.7
The DFAICL
30
20
10
1.8 1.9 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7
d = 30 mm
d = 20 mm
d = 15 mm
d = 10 mm
(b)
The Receiving
Coil
C12
M1
C13
C14
R13
R14
D11
+
C16
RFC12
C17
1.4 1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7
Frequency (MHz)
Figure 13. The output voltage at the transmitting coil with varied d (at a supply power
of 30 dBm) for the traditional ICL and the DFAICL.
IEEE CIRCUITS AND SYSTEMS MAGAZINE
33
Mag. Tx Voltage (V)
Mag. Tx Voltage (V)

IEEE Circuits and Systems Magazine - Q3 2022

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